A structure capable of improving the working efficiency of a vertical mill
Patent Information
- Application Number
- CN202522114705.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-30
- Publication Date
- 2026-09-11
- Estimated Expiration
- 2035-09-30
AI Technical Summary
这部分悬浮粉料不仅会增大磨机压差，引起磨机震动，还会导致磨机内部粉磨循环受阻，降低磨机工作效能
本申请通过设置倒锥形回粉装置，在立式磨粉机内部提供一个低速区域以用于粉料的分选和不合格粒径粉料的回粉，实现不合格粉料快速回到磨盘上，参与到下一个粉磨过程，提高磨机工作效能，减少立式磨粉机内悬浮粉料的阻塞，减轻磨机震动情况；通过设置倒锥形调速锥环组，调节回粉装置附近的风速，调控参与选粉的粒径范围和回粉的粒径范围，通过预筛选，提高磨内循环，进而提高磨机工作效能。
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Figure CN224736379U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of vertical grinding mills, and in particular relates to a structure that can improve the working efficiency of vertical grinding mills. Background Technology
[0002] When a vertical grinding mill is working, the material is crushed by grinding rollers and a grinding disc. Under centrifugal force, the crushed material continuously moves towards the edge of the grinding disc and is carried by the rising airflow to the classifier for further grinding. Qualified powder passes through the classifier and is discharged from the mill, while unqualified powder falls back onto the grinding disc for re-grinding. During the process of the powder traveling with the rising airflow to the classifier, due to the increased ventilation area and decreased air velocity, some large particles fall back onto the grinding disc for re-grinding, while the remaining powder continues to rise to the classifier for further separation. Powder that fails to pass through the classifier falls onto the grinding disc for re-grinding, while some remains suspended inside the mill. This suspended powder not only increases the mill's pressure differential, causing mill vibration, but also obstructs the internal grinding circulation, reducing the mill's operating efficiency. Utility Model Content
[0003] To address the technical problems existing in the prior art, this application provides a structure that can improve the working efficiency of a vertical grinding mill. By setting up a powder return device, a low-speed zone is provided inside the mill for powder sorting and return of unqualified powder. By setting up a speed regulating cone ring group, the wind speed near the powder return device is adjusted, thereby controlling the particle size range of the powder participating in the sorting and the particle size range of the returned powder. Through pre-screening, the internal circulation of the mill is improved, thereby improving the working efficiency of the mill.
[0004] To achieve the above objectives, this utility model provides the following technical solution: A structure for improving the working efficiency of a vertical grinding mill includes a grinding mill cylinder. A mounting base is fixedly connected to the center of the inner circumference of the grinding mill cylinder. A connecting frame is provided on the mounting base, and a powder return device is fixedly connected to the connecting frame. The powder return device includes an inverted conical powder return cone and a powder return straight pipe provided at the lower opening of the powder return cone. The powder return straight pipe is located above the grinding disc. An inverted conical speed regulating cone ring assembly is fixedly connected to the upper opening of the powder return cone.
[0005] Preferably, the speed regulating cone ring group includes one or more speed regulating cone rings. When the speed regulating cone ring group includes multiple speed regulating cone rings, adjacent speed regulating cone rings are fixedly nested in sequence.
[0006] Preferably, the lower end of the speed regulating cone ring adjacent to the powder return cone is detachably fixedly connected to the upper opening of the powder return cone, and two adjacent speed regulating cone rings are detachably fixedly nested.
[0007] Preferably, a return cone threaded hole is provided on the upper part of the inner circumference of the return cone, a speed regulating cone ring through hole is provided on the lower part of the inner circumference of the speed regulating cone ring, and a speed regulating cone ring threaded hole is provided on the upper part of the inner circumference of the speed regulating cone ring; a fixing bolt passes through the speed regulating cone ring through hole and is threaded into the return cone threaded hole to fix the speed regulating cone ring to the return cone; a connecting bolt passes through the speed regulating cone ring through hole of the upper speed regulating cone ring and is threaded into the speed regulating cone ring threaded hole of the adjacent and lower speed regulating cone ring to fix the two adjacent speed regulating cone rings to each other.
[0008] Preferably, a positioning block is fixedly connected to the inner circumference of the speed regulating cone ring below the threaded hole of the speed regulating cone ring, and the lower end of the adjacent speed regulating cone ring above abuts against the upper end face of the positioning block on the adjacent speed regulating cone ring below.
[0009] Preferably, the connecting frame includes a plurality of connecting beams, one end of which is fixedly connected to the mounting base and the other end of which is fixedly connected to the outer circumference of the upper part of the powder return cone.
[0010] Preferably, a reinforcing ring is fixedly connected to the outer circumference of the upper part of the powder return cone, and the other end of each connecting beam is fixedly connected to the reinforcing ring.
[0011] Preferably, the included angle β between the powder return device and the speed regulating cone ring and the mill cylinder is between 20° and 40°.
[0012] Compared with the prior art, the beneficial effects of this utility model are: This application provides a low-speed zone inside the vertical mill by setting up an inverted conical powder return device for powder sorting and return of powder with unqualified particle sizes. This allows unqualified powder to quickly return to the grinding disc and participate in the next grinding process, improving the mill's working efficiency, reducing the blockage of suspended powder in the vertical mill, and mitigating mill vibration. By setting up an inverted conical speed-regulating cone ring assembly, the wind speed near the powder return device is adjusted, controlling the particle size range of the powder participating in sorting and the particle size range of the returned powder. Through pre-screening, the internal circulation of the mill is improved, thereby enhancing the mill's working efficiency.
[0013] By setting up a powder return device and a speed-regulating cone-ring assembly, an annular ventilation surface (i.e., gravity separation zone one) is formed by the powder return cone and the speed-regulating cone-ring assembly and the inner circumference of the grinding mill cylinder. As the annular ventilation surface gradually shrinks from bottom to top, the wind speed in gravity separation zone one increases, thereby increasing the speed at which powder enters gravity separation zone two from gravity separation zone one. This increases the amount of powder passing through gravity separation zone one while timely separating large-diameter powders to prevent them from entering gravity separation zone two. After the powder enters gravity separation zone two, the ventilation cross-section inside the vertical mill above the speed-regulating cone ring group suddenly increases (i.e., gravity separation zone two). The wind speed in gravity separation zone two decreases rapidly, creating a low-velocity area above the speed-regulating cone ring group. Powder of the correct particle size enters the classifier's selection area under a certain wind speed and is collected through the discharge port after being classified by the classifier. Powder of the incorrect particle size falls rapidly into the speed-regulating cone ring group due to the decreasing wind force and its own gravity. By setting up gravity separation zones one and two, the wind speed difference between them can be increased, accelerating the separation of coarse and fine powders. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model when installed on a vertical grinding mill.
[0015] Figure 2 This is a schematic diagram of the powder return device of this utility model.
[0016] Figure 3 This is a schematic diagram of the speed-regulating cone-ring assembly of this utility model.
[0017] Figure 4 This is a schematic diagram of the connection structure between the speed regulating cone ring assembly and the powder return cone of this utility model.
[0018] In the diagram: 1. Grinding mill cylinder; 2. Mounting base, 3. Connecting frame; 31. Reinforcing ring; 32. Connecting beam; 33. Reinforcing beam. 4. Powder return device; 41. Powder return cone; 411. Threaded hole of powder return cone; 42. Powder return straight pipe; 43. Fixing bolt. 5. Speed-regulating cone ring assembly; 51. Speed-regulating cone ring; 511. Speed-regulating cone ring through hole; 512. Speed-regulating cone ring threaded hole; 52. Connecting bolt; 53. Positioning block. 6. Vertical grinding mill; 61. Grinding disc; 62. Air classifier; 63. Discharge port; 64. Air inlet; 65. Gravity separation zone one; 66. Gravity separation zone two; 67. Grinding roller; 68. Air classifier separation zone. Detailed Implementation
[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0020] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Example
[0021] See appendix Figure 1 As shown, a structure for improving the working efficiency of a vertical grinding mill includes a grinding mill cylinder 1. A mounting base 2 is welded to the center of the inner circumference of the grinding mill cylinder 1. Specifically, the mounting base 2 can be a ring structure horizontally welded to the inner circumference of the grinding mill cylinder 1, or it can be a split structure, i.e., multiple block structures or channel steel structures evenly welded to the inner circumference of the grinding mill cylinder 1, etc. A connecting frame 3 is provided on the mounting base 2, and a powder return device 4 is fixedly connected to the connecting frame 3. A speed regulating cone ring assembly 5 is fixedly connected to the powder return device 4.
[0022] See appendix Figure 2 As shown, the powder return device 4 includes an inverted conical powder return cone 41. The powder return cone 41 has a hollow structure inside and open structures at both ends. The inner diameter of the upper opening of the powder return cone 41 is larger than the inner diameter of the lower opening. A powder return straight pipe 42 is vertically welded to the lower opening of the powder return cone 41. The powder return straight pipe 42 is positioned above the grinding disc 61. Preferably, in order to allow the powder in the powder return straight pipe 42 to fall to the center of the grinding disc 61, the powder return straight pipe 42 can be coaxially arranged with the grinding disc 61.
[0023] In this embodiment, to ensure the powder return device 4 is stably fixed on the connecting frame 3, the connecting frame 3 includes a reinforcing ring 31 welded to the outer circumference of the upper part of the powder return cone 41, and multiple connecting beams 32, one end of which is fixed to the mounting base 2 by welding or bolts, and the other end of which is welded to the reinforcing ring 31. When the mounting base 2 is a ring-shaped structure, the multiple connecting beams 32 are evenly distributed and fixed on the mounting base 2. When the mounting base 2 is the aforementioned split structure, the number of connecting beams 32 corresponds one-to-one with the number of mounting bases 2. To achieve stable support for the powder return device 4, the connecting beams 32 are obliquely upward toward the outer circumference of the powder return cone 41. In addition, reinforcing beams 33 are welded between each adjacent connecting beam 32 to further improve the installation stability of the powder return device 4.
[0024] See appendix Figure 1 As shown, an inverted conical speed-regulating cone ring assembly 5 is fixedly connected inside the upper opening of the powder return cone 41. The speed-regulating cone ring assembly 5 includes one or more speed-regulating cone rings 51. Either one speed-regulating cone ring 51 can be fixedly connected inside the upper opening of the powder return cone 41, or multiple speed-regulating cone rings 51 can be fixedly connected inside the upper opening of the powder return cone 41. In this case, two adjacent speed-regulating cone rings 51 are sequentially and nested. The lower end of the speed-regulating cone ring 51 adjacent to the powder return cone 41 is detachably fixedly connected inside the upper opening of the powder return cone 41. The detachable nesting of two adjacent speed-regulating cone rings 51 facilitates the installation of the speed-regulating cone rings 51 on the powder return cone 41 and allows for adaptive installation and removal based on the required number of speed-regulating cone rings 51.
[0025] See appendix Figure 3 As shown, in order to facilitate the assembly and disassembly of the two speed regulating cone rings 51, in this embodiment, a speed regulating cone ring through hole 511 is provided at the lower part of the inner circumference of the speed regulating cone ring 51, and a speed regulating cone ring threaded hole 512 is provided at the upper part of the inner circumference of the speed regulating cone ring 51. Both the speed regulating cone ring through hole 511 and the speed regulating cone ring threaded hole 512 can be opened perpendicular to the inner circumference of the speed regulating cone ring 51. Therefore, when the two speed regulating cone rings 51 are nested together, the lower part of the upper speed regulating cone ring 51 is embedded in the upper opening of the lower speed regulating cone ring 51. Since the structure and size of each speed regulating cone ring 51 are the same, the lower outer circumference of the upper speed regulating cone ring 51 fits against the upper inner circumference of the lower speed regulating cone ring 51. At this time, the connecting bolt 52 passes through the speed regulating cone ring through hole 511 of the upper speed regulating cone ring 51 and is threaded into the speed regulating cone ring threaded hole 512 of the adjacent lower speed regulating cone ring 51, so as to fix the two adjacent speed regulating cone rings 51 together.
[0026] Furthermore, in order to position the upper speed-regulating cone ring 51 to facilitate the quick installation of the connecting bolt 52, multiple positioning blocks 53 are welded to the inner circumference of the speed-regulating cone ring 51 below the speed-regulating cone ring threaded hole 512 of each speed-regulating cone ring 51. The positioning block 53 can be a cubic structure with its upper end face perpendicular to the circumference of the speed-regulating cone ring 51. Thus, the lower end face of the adjacent upper speed-regulating cone ring 51 can abut against the upper end face of the positioning block 53 on the adjacent lower speed-regulating cone ring 51. At this time, rotating the upper speed-regulating cone ring 51 will align the speed-regulating cone ring through hole 511 of the upper speed-regulating cone ring 51 with the speed-regulating cone ring threaded hole 512 of the lower speed-regulating cone ring 51, so as to facilitate the insertion and screwing in of the connecting bolt 52.
[0027] See appendix Figure 4 As shown, in order to facilitate the fixing of the speed regulating cone ring 51 in the upper opening of the powder return cone 41, and similarly to the fixing and nesting of the two adjacent speed regulating cone rings 51, the speed regulating cone ring 51 and the powder return cone 41 have the same taper, that is, the lower outer circumference of the speed regulating cone ring 51 can fit with the upper inner circumference of the powder return cone 41.
[0028] A return cone threaded hole 411 is provided on the upper part of the inner circumference of the return cone 41. The return cone threaded hole 411 can pass through the return cone 41. Multiple positioning blocks 53 are welded on the inner circumference of the return cone 41 below the return cone threaded hole 411. Thus, the lower end face of the upper speed regulating cone ring 51 can abut against the upper end face of the positioning block 53 on the return cone 41. At this time, by rotating the upper speed regulating cone ring 51, the speed regulating cone ring through hole 511 of the upper speed regulating cone ring 51 can be aligned with the return cone threaded hole 411 of the return cone 41, so as to facilitate the insertion and screwing in of the fixing bolt 43. The fixing bolt 43 passes through the speed regulating cone ring through hole 511 and is threadedly connected to the return cone threaded hole 411 to fix the speed regulating cone ring to the return cone 41. It should be noted that, in order to stabilize the airflow inside the vertical mill 6, the return cone 41 and the speed regulating cone ring 51 can be coaxially set with the grinding disc 61.
[0029] The working principle of this application is as follows: By setting up the powder return device 4, a low-speed zone is designed inside the vertical mill 6 for powder sorting and return of unqualified powder. Specifically, the air velocity inside the powder return cone 41 is low, and unqualified particles not sorted by the classifier 62 fall into the speed-regulating cone ring group 5 and the powder return cone 41, then fall onto the grinding disc 61 via the powder return straight pipe 42. By setting up the speed-regulating cone ring 51 (e.g., ... Figure 1The a1, a2, a3, etc. in the image are designed to regulate the particle size range of the powder being sorted and the powder being returned by adjusting the wind speed near the powder return device 4. This means adjusting the speed difference between the top and bottom of the uppermost speed regulating cone ring 51, thereby increasing the separation speed of unqualified particle size powder. Qualified particle size powder enters the dust collector through the powder classifier 62 and the discharge port 63, while unqualified particle size powder quickly enters the speed regulating cone ring group 5 and the powder return cone 41 and falls onto the grinding disc 61 for re-grinding. By pre-screening and improving the internal circulation of the mill, the working efficiency of the mill is improved.
[0030] See Figure 1 During installation, the mounting base 2 is first welded to the inner circumference of the mill cylinder 1, and then the powder return device 4 is fixedly installed on the mounting base 2 through the connecting frame 4. The connection is firm. According to the product category and particle size requirements to be ground, the corresponding number of speed regulating cone rings 51 can be installed to realize the rapid return of unqualified powder to the grinding disc 61 to participate in the next grinding process, improve the working efficiency of the mill, reduce the blockage of suspended powder in the vertical mill 6, reduce the vibration of the mill, and control the powder of a certain particle size range to participate in the powder classifier by adjusting the wind speed inside the mill, thereby improving the powder classification efficiency and enhancing the overall working efficiency of the mill.
[0031] See Figure 1 During the operation of the vertical mill 6, the trajectory of the powder inside the mill is shown in the figure. The hot air blown out by the wind power equipment enters the air ring through the air inlet 64 of the vertical mill 6. The material entering the vertical mill 6 is ground by the grinding roller 67 and the grinding disc 61. At the edge of the grinding disc 61, it is blown upward by the rising airflow. The larger particles are blown to the gravity separation zone 1 65 between the return powder straight pipe 42 and the upper end face of the top speed regulating cone ring 51. When passing through the area of the speed regulating cone ring group 5, the ventilation section is adjusted by controlling the number of speed regulating cone rings 51, and the wind speed will also change accordingly. Some coarse powder falls back onto the grinding disc 61 under the action of gravity, while the remaining powder continues to rise with the airflow and enters the gravity separation zone 2 66 between the upper end face of the top speed regulating cone ring 51 and the classifier 62 through the gravity separation zone 1 65. Secondary separation is carried out in the gravity separation zone 2 66.
[0032] The annular ventilation surface (i.e., gravity separation zone 65) formed by the return cone 41, the speed regulating cone ring group 5, and the inner circumference of the mill cylinder 1 is equivalent to installing another air ring device inside the vertical mill. As the annular ventilation surface gradually shrinks from bottom to top, the wind speed in gravity separation zone 65 increases, thereby increasing the speed at which the powder enters gravity separation zone 66 from gravity separation zone 65. This increases the amount of powder passing through gravity separation zone 65 while timely separating large-diameter powders to prevent them from entering gravity separation zone 66. After the powder enters gravity separation zone 66, the ventilation cross-section of the vertical mill 6 above the speed-regulating cone ring group 5 suddenly increases (i.e., gravity separation zone 66), causing the wind speed in gravity separation zone 66 to decrease rapidly. A low-velocity area is formed above the speed-regulating cone ring group 5. Powder of the correct particle size enters the separation zone of the classifier 62 under the influence of a certain wind speed. Figure 1 In the classifier separation zone 68, the powder is classified by the classifier 62 and then collected through the discharge port. The powder with unqualified particle size is reduced by the wind force and falls into the speed regulating cone ring group 5 under its own gravity, and then falls back onto the grinding disc 61 through the powder return cone 41 to participate in the next grinding process.
[0033] Therefore, by setting up gravity separation zone 1 65 and gravity separation zone 2 66, the wind speed difference between gravity separation zone 1 65 and gravity separation zone 2 66 can be increased, which can accelerate the separation of coarse and fine powders.
[0034] Furthermore, research revealed that excessively large or small angles β between the return cone 41 and the speed regulating cone ring 51 and the mill cylinder 1 not only fail to improve the working efficiency of the vertical mill but also negatively impact its normal operation. When the angle β is too large, it significantly increases the internal air resistance of the vertical mill, increases the system pressure difference, causes vibration, and leads to severe over-grinding of materials. When the angle β is too small, it severely affects the function of gravity separation zone 65, resulting in a significantly increased proportion of coarse powder entering the classifier 62's selection area from the powder in gravity separation zone 66, accelerating the wear of the classifier 62's blades. Research showed that when 20°≤β≤40°, the vertical mill system operates stably, gravity separation zones 65 and 66 effectively perform their separation functions, and the classifier 62's blades show no abnormal wear.
[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A structure for improving the working efficiency of a vertical grinding mill, comprising a grinding mill cylinder, characterized in that: A mounting base is fixedly connected to the center of the inner circumference of the grinding mill cylinder, and a connecting frame is provided on the mounting base. The powder return device is fixedly connected to the connecting frame. The powder return device includes an inverted conical powder return cone, and a powder return straight pipe is provided at the lower opening of the powder return cone. The powder return straight pipe is located above the grinding disc. An inverted conical speed regulating cone ring assembly is fixedly connected to the upper opening of the powder return cone.
2. The structure for improving the working efficiency of a vertical grinding mill according to claim 1, characterized in that: The speed regulating cone ring group includes one or more speed regulating cone rings. When the speed regulating cone ring group includes multiple speed regulating cone rings, two adjacent speed regulating cone rings are fixedly nested in sequence.
3. The structure for improving the working efficiency of a vertical grinding mill according to claim 2, characterized in that: The lower end of the speed regulating cone ring adjacent to the powder return cone is detachably fixedly connected to the upper opening of the powder return cone, and two adjacent speed regulating cone rings are detachably fixedly nested.
4. The structure for improving the working efficiency of a vertical grinding mill according to claim 3, characterized in that: A return cone threaded hole is provided on the upper part of the inner circumference of the return cone, a speed regulating cone ring through hole is provided on the lower part of the inner circumference of the speed regulating cone ring, and a speed regulating cone ring threaded hole is provided on the upper part of the inner circumference of the speed regulating cone ring. The fixing bolt passes through the through hole of the speed regulating cone ring and is threaded into the threaded hole of the powder return cone to fix the speed regulating cone ring to the powder return cone; The connecting bolts are inserted into the through hole of the upper speed regulating cone ring and threaded into the threaded hole of the adjacent lower speed regulating cone ring to fix the two adjacent speed regulating cone rings together.
5. The structure for improving the working efficiency of a vertical grinding mill according to claim 4, characterized in that: A positioning block is fixedly connected to the inner circumference of the speed regulating cone ring below the threaded hole of the speed regulating cone ring. The lower end of the adjacent speed regulating cone ring above abuts against the upper end face of the positioning block on the adjacent speed regulating cone ring below.
6. The structure for improving the working efficiency of a vertical grinding mill according to claim 1, characterized in that: The connecting frame includes multiple connecting beams, one end of which is fixedly connected to the mounting base and the other end of which is fixedly connected to the outer circumference of the upper part of the powder return cone.
7. The structure for improving the working efficiency of a vertical grinding mill according to claim 6, characterized in that: A reinforcing ring is fixedly connected to the outer circumference of the upper part of the powder return cone, and the other end of each connecting beam is fixedly connected to the reinforcing ring.
8. The structure for improving the working efficiency of a vertical grinding mill according to claim 1, characterized in that: The included angle β between the powder return device and the speed regulating cone ring and the mill cylinder is between 20° and 40°.