Vertical coal mill and method of installing the same
By determining the center reference point on the base surface of the vertical coal mill, and combining roughening, slurry application, and grinding leveling treatments, the problem of grinding disc leveling being limited by the position of the reducer was solved, thus achieving high-precision installation of the vertical coal mill.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- THE SIXTH CONSTR CO LTD OF CHINA NAT CHEM ENG
- Filing Date
- 2026-04-23
- Publication Date
- 2026-05-29
AI Technical Summary
In the installation method of vertical coal mill, the leveling of the grinding disc is limited by the position of the reducer, making it difficult to guarantee high precision, and the adjustment is difficult and time-consuming.
By determining a center reference point on the foundation surface, the grinding disc base is installed with this center reference point as the benchmark. The base is then roughened, slurryed, and ground to provide a flat reference surface, ensuring the precise leveling of the grinding disc base. The sequence of determining the center reference point first and then installing the main body of the coal mill reduces the difficulty and time of adjustment.
This improved the installation accuracy of the vertical coal mill, reduced the difficulty and time of adjustment, and ensured the levelness and installation quality of the mill base.
Smart Images
Figure CN122106111A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of coal mill technology, and in particular to a vertical coal mill and its installation method. Background Technology
[0002] Vertical coal mills (also known as medium-speed coal mills or vertical roller mills) are core equipment in pulverizing systems in industries such as power, metallurgy, and cement. Their working principle involves the grinding disc driving the grinding rollers to rotate relative to each other, crushing raw coal into pulverized coal. A vertical coal mill typically consists of a reducer, grinding disc, grinding rollers, pressurizing device, separator, and motor, among other components. The entire machine can weigh hundreds of tons and withstands enormous dynamic impact loads and vibrations during operation.
[0003] Currently, the installation method for vertical coal mills typically involves first hoisting the reducer, then using the reducer as a reference to install the grinding disc base, connecting the grinding disc base to the reducer, and finally installing the grinding rollers. However, this method of installation makes leveling the grinding disc difficult due to the limited position of the reducer, resulting in inconsistent installation accuracy, high adjustment complexity, and long installation time. Summary of the Invention
[0004] The main objective of this invention is to propose a vertical coal mill and its installation method, aiming to solve the technical problems of high difficulty and long time consumption in the installation and adjustment of vertical coal mills.
[0005] To achieve the above objectives, the present invention proposes an installation method for a vertical coal mill, the installation method comprising the following steps: Set up the foundation for the vertical coal mill; The upper surface of the foundation is roughened, and the roughened upper surface is then subjected to a grouting process. The upper surface is ground and leveled; Determine a center reference point on the upper surface; The grinding disc base is installed on the upper surface according to the central reference point; Level the grinding disc base; The main body of the coal mill is installed on the grinding disc base to complete the installation of the vertical coal mill.
[0006] In one embodiment, before the steps of roughening the upper surface of the foundation and applying grout to the roughened upper surface, the method further includes: A measurement grid is established on the upper surface; And measure the elevation of each grid intersection point; Detect the levelness of the upper surface; The step of grinding and leveling the upper surface includes: The upper surface is ground and leveled according to the levelness and the elevation of each grid intersection point.
[0007] In one embodiment, the grid spacing is no greater than 1000mm×1000mm, and the levelness deviation of each of the upper surfaces after grinding and leveling is no greater than 0.5mm / m².
[0008] In one embodiment, the step of determining the center reference point on the upper surface includes: Two steel wires are arranged on the upper surface, intersecting diagonally along the foundation, with the intersection of the two steel wires located at the center of the foundation. This intersection is then designated as the center reference point.
[0009] In one embodiment, the step of setting two steel wires intersecting diagonally along the foundation on the upper surface includes: Anchors for tensioning steel wires are pre-embedded at the four corners of the foundation; Tension gauges are used to control the tension of each steel wire, ensuring that the tension of each steel wire remains consistent. A plumb bob is suspended at the intersection of the two steel wires to verify the vertical alignment between the intersection and the center of the foundation.
[0010] In one embodiment, the step of leveling the grinding disc base includes: Multiple shims are spaced apart at the bottom of the grinding disc base; Multiple spaced reference points are set on the grinding disc base; The elevation of each reference point is detected, and the shims are adjusted according to the elevation of each reference point to level the grinding disc base.
[0011] In one embodiment, the step of installing the coal mill body on the grinding disc base to complete the installation of the vertical coal mill includes: A grinding roller stand is installed on the grinding disc base; A grinding roller stand and a speed reducer are installed on the grinding roller stand. The grinding disc and grinding body are installed on the reducer; The grinding roller is mounted on the grinding roller stand; Install the air classifier on the mill body; The motor is mounted on the reducer.
[0012] In one embodiment, prior to the step of mounting the grinding disc and grinding body onto the reducer, the method further includes: Set up an assembly platform; The grinding disc is assembled on the assembly platform; Before the step of mounting the grinding roller onto the grinding roller stand, the method further includes: The grinding rollers are assembled on the assembly platform.
[0013] In one embodiment, the steps of roughening the upper surface of the foundation and applying a grout to the roughened upper surface include: The upper surface is roughened using high-pressure water jet or mechanical chiseling; the chiseling depth is 5~10mm, and the spacing between chiseling points is no more than 50mm.
[0014] The technical solution of this invention determines a central reference point on the foundation surface and uses this reference point as a benchmark to install the grinding disc base. Leveling of the grinding disc base is no longer restricted by the deceleration mechanism, allowing leveling operations to be performed in open space, thus reducing adjustment difficulty. Furthermore, by first determining the central reference point, then installing and leveling the grinding disc base, and finally installing the main body of the coal mill, the processes are smoothly connected, resulting in a high leveling pass rate for the grinding disc base, reducing rework, and shortening installation time. Finally, by roughening, slurrying, and grinding the foundation surface, a flat reference surface is provided for the upper surface; by determining the central reference point, a precise benchmark is provided for the grinding disc base; and finally, by leveling the grinding disc base, the horizontality of the grinding disc base is ensured. This series of steps works together to improve the installation accuracy of the vertical coal mill. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of an embodiment of the installation method for a vertical coal mill provided by the present invention; Figure 2 This is a schematic diagram of the structure and installation structure of the vertical coal mill provided by the present invention.
[0017] Explanation of icon numbers: 100. Main body of coal mill; 200. Mill disc base; 300. Foundation.
[0018] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0020] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0021] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.
[0022] This invention proposes an installation method for a vertical coal mill.
[0023] Please see Figures 1 to 2 In one embodiment of the present invention, the installation method of the vertical coal mill includes the following steps: Step S100: Set up the foundation for the vertical coal mill; construct a 300mm concrete foundation according to the overall weight and operating load of the vertical coal mill. Subsequent installation can only proceed after the 300mm concrete foundation has reached the design strength.
[0024] Step S200: The upper surface of the foundation is roughened, and then grouting is applied to the roughened upper surface. A roughening device is used to roughen the upper surface of the foundation 300, removing the surface laitance layer and increasing surface roughness. After roughening, surface debris and dust are cleaned. A layer of grout is then laid on the roughened and cleaned upper surface to form a grouting layer. The grouting treatment fills the unevenness of the upper surface of the foundation 300, providing a uniform reference layer for subsequent grinding and leveling.
[0025] Step S300: Grind and level the upper surface; after the slurry layer has cured, use grinding equipment to grind the upper surface after slurry application so that the upper surface meets the required flatness requirements.
[0026] Step S400: Determine a center reference point on the upper surface; Step S500: Install the grinding disc base on the upper surface according to the center reference point; Step S600: Level the grinding wheel base; use a level to measure the levelness of the upper surface of the grinding wheel base 200, and adjust the grinding wheel base 200 by adjusting the shims or pads to achieve the levelness required by the design.
[0027] Step S700: Install the main body of the coal mill on the grinding disc base to complete the installation of the vertical coal mill. Using the leveled grinding disc base 200 as a reference, install the reducer, grinding disc, grinding rollers, and other components of the main body 100 of the coal mill in sequence to complete the installation of the vertical coal mill. After completing the installation of the main body 100 of the coal mill, tighten the anchor bolts used to install the grinding disc base 200 onto the foundation 300, and perform secondary grouting on the anchor bolts.
[0028] The technical solution of this invention determines a central reference point on the upper surface of the foundation 300, and installs the grinding disc base 200 based on this central reference point. The leveling of the grinding disc base 200 is no longer restricted by the deceleration mechanism, allowing leveling operations to be performed in an open space, reducing the difficulty of adjustment. Furthermore, by first determining the central reference point, then installing and leveling the grinding disc base 200, and finally installing the coal mill body 100, the processes are smoothly connected, resulting in a high leveling pass rate for the grinding disc base 200, reducing rework, and thus shortening the installation time. Finally, by roughening, slurrying, and grinding the upper surface of the foundation 300, a flat reference surface is provided; by determining the central reference point, a precise reference is provided for the grinding disc base 200; and finally, by leveling the grinding disc base 200, the levelness of the grinding disc base 200 is ensured. This series of steps works together to improve the installation accuracy of the vertical coal mill.
[0029] In one embodiment of the present invention, before step S200, the method further includes: Step A100: Establish a measurement grid on the upper surface. The technical solution of this invention establishes a measurement grid on the upper surface of the foundation 300 by determining a central reference point on the upper surface and using this central reference point as a reference, after the foundation 300 is set up and before roughening. Specifically, based on the planar dimensions of the upper surface of the foundation 300, a theodolite or total station is used to draw crisscrossing grid lines on the upper surface, forming a regular measurement grid.
[0030] Step A200, and measure the elevation of each grid intersection point; using a level or total station, with the leveling benchmarks around the foundation 300 as references, measure the elevation of each grid intersection point one by one, and record the measurement data. All grid intersection points should be observed within the same measurement cycle to reduce measurement errors.
[0031] Step A300: Detect the levelness of the upper surface; calculate the levelness of the upper surface of the foundation 300 based on the elevation data of each grid intersection point.
[0032] Step S400 includes: Step A410: Grind and level the upper surface according to the levelness and the elevation of each grid intersection point. Based on the 3D elevation map, areas with excessively high elevations are designated as key grinding areas, while areas with excessively low elevations are designated as areas requiring light grinding or grouting. A reasonable benchmark elevation is calculated based on the elevation distribution of each grid intersection point, serving as the target value for grinding and leveling. The key grinding areas are preferentially ground using grinding equipment, with the post-grind elevation measured in real-time and compared with the target elevation to control the grinding depth. After the key areas are ground to near the target elevation, the entire upper surface is thoroughly fine-ground to ensure that the deviation between the elevation of each grid intersection point and the target elevation is controlled within the allowable range.
[0033] Specifically, by establishing a measurement grid before grinding, measuring the elevation of each grid intersection point, and checking the levelness, the elevation distribution of the upper surface can be accurately determined. Using this data to guide the grinding operation, areas requiring focused grinding can be accurately located, avoiding blind grinding, reducing ineffective work, and improving grinding efficiency. Furthermore, by setting a unified target elevation and using the measured elevation of each grid intersection point as a reference for grinding, the elevation consistency of each area on the ground upper surface is good, and the flatness deviation can be controlled within a smaller range, providing a more accurate benchmark for the subsequent installation of the grinding disc base 200.
[0034] In one embodiment of the present invention, the grid spacing is no greater than 1000mm×1000mm, and the levelness deviation of the upper surface after grinding and leveling is no greater than 0.5mm / m².
[0035] Specifically, the grid spacing is limited to no more than 1000mm × 1000mm to ensure that the grid density is sufficient to accurately reflect the actual undulations of the upper surface. An excessively large grid spacing may result in localized unevenness not being captured by the grid intersections, creating measurement blind spots. A grid spacing of no more than 1000mm × 1000mm, combined with the requirement that the horizontal deviation after grinding and leveling should not exceed 0.5mm / m², ensures that the measurement data matches the grinding accuracy, avoiding grinding quality problems caused by sparse measurement points. Furthermore, with a grid density of 1000mm × 1000mm, grinding guided by data based on the elevation of each grid intersection can control the horizontal deviation within any 1m² area to within 0.5mm, meeting the high-precision installation requirements of vertical coal mills.
[0036] In one embodiment of the present invention, step S400 includes: Step S410: Two steel wires are arranged on the upper surface, intersecting along the diagonal of the foundation, and the intersection of the two steel wires is located at the center of the foundation, and the intersection is determined as the center reference point.
[0037] Specifically, the intersecting lines formed by the tensioned steel wires are visually visible on-site, allowing construction personnel to directly observe whether the intersection point deviates from the center of foundation 300, facilitating immediate adjustment and verification. Compared to invisible coordinate points or marker lines, the central reference point formed by the intersecting steel wires offers better visibility, facilitating rapid alignment during the hoisting of the millstone base 200 and improving installation efficiency. Furthermore, the diagonals of foundation 300 are unique and definite; with the two steel wires set along their respective diagonals, their intersection point is necessarily located at the geometric center of foundation 300. This method uses the geometric contour of foundation 300 itself as a reference, unaffected by errors in external measurement benchmarks or instrument alignment, avoiding the cumulative errors caused by the measurement process in traditional methods, and improving the accuracy and reliability of the central reference point position.
[0038] In one embodiment of the present invention, step S410 includes: Step S411: Anchors for tensioning steel wires are pre-embedded at the four corners of the foundation; Step S412: Use a tension meter to control the tension of each wire to keep the tension of each wire consistent. Step S413: Suspend a plumb bob at the intersection of the two steel wires to verify the vertical alignment of the intersection with the center of the foundation.
[0039] Specifically, dedicated anchors are pre-embedded at the four corners of the 300mm foundation to provide reliable fixing points for the steel wires, avoiding changes in wire position caused by loosening or slippage of temporary fixing points. Tensioners are used to control the tension, making the tensioning process quantifiable and controllable. Maintaining consistent tension on both steel wires ensures uniform deflection, eliminating intersection point deviations caused by uneven tension and improving the accuracy of center reference point determination. Furthermore, by suspending a plumb bob at the intersection point, the natural downward descent of the plumb bob under gravity allows for direct verification of the vertical alignment between the intersection point and the center of the 300mm foundation. This achieves three-dimensional spatial precision control of the center reference point, avoiding center point deviations caused by wire tilting or line-of-sight errors.
[0040] In one embodiment of the present invention, step S600 includes: Step S610: A plurality of shims are spaced apart at the bottom of the grinding disc base around the grinding disc base; Step S620: Set multiple spaced reference points on the grinding disc base; Step S630: Detect the elevation of each of the reference points and adjust the shims according to the elevation of each of the reference points to level the grinding disc base.
[0041] Specifically, first, install the base plate of the reducer. Clean the upper surface of the grinding disc base 200 to ensure it is clean. Then, hoist the base plate of the reducer into its installation position on the grinding disc base 200 and fix it to the foundation 300 frame through the corresponding positioning bolt holes on the grinding disc base 200. Use adjusting bolts to fine-tune and level the elevation and horizontality of the base plate. After leveling and aligning the base plate, weld the fixing blocks according to the design requirements and install the grouting template. After the template support is completed, pour the specified grouting material and perform the corresponding curing work. After the grouting of the reducer base plate reaches a certain strength, install the half coupling onto the reducer drive input shaft, and then hoist the reducer. The reducer is positioned by shaft pins through the positioning holes on the base plate to ensure the accuracy of the corresponding axis position.
[0042] In one embodiment of the present invention, step S700 includes: Step S710: Install the grinding roller stand on the grinding disc base; using the leveled grinding disc base 200 as a reference, hoist the grinding roller stand onto the grinding disc base 200. Adjust the center of the grinding roller stand to coincide with the center of the grinding disc base 200, and ensure that the orientation is consistent with the grinding disc base 200. Fix the grinding roller stand onto the grinding disc base 200 using bolts or welding.
[0043] Step S720: Install the grinding roller base and the reducer on the grinding roller base; hoist the reducer to the center position of the grinding disc base 200 or the preset reducer installation position. Using the center of the grinding disc base 200 and the horizontal plane as a reference, adjust the center of the output shaft of the reducer to be coaxial with the center of the grinding disc base 200, ensure that the reducer base and the grinding disc base 200 are in uniform contact, and tighten the connecting bolts.
[0044] Step S730: Install the grinding disc and grinding body onto the reducer; Step S740: Install the grinding roller onto the grinding roller stand; Step S750: Install the air classifier onto the mill body; Step S760: Install the motor onto the reducer.
[0045] Specifically, the installation sequence follows the assembly principle of "bottom to top, inside to outside, main to auxiliary": using the grinding disc base 200 as the absolute reference, the grinding roller platform is installed first to establish the upper support structure, then the reducer is installed to form the transmission core, followed by the grinding disc and grinding body to form the grinding body, then the grinding rollers to form the grinding pair, and finally the classifier and motor to complete the system function. The installation of each component is based on the already installed lower-level components, forming a clear reference transmission chain and avoiding the cumulative errors caused by multiple parallel references. The reducer is installed on the grinding disc base 200, using the center and horizontal plane of the grinding disc base 200 as direct references, eliminating the influence of reducer position deviation on subsequent grinding disc installation in traditional methods; the grinding disc is installed on the reducer, allowing direct detection of the parallelism between the grinding disc and the grinding disc base 200, facilitating real-time adjustment; the grinding rollers are installed on the grinding roller platform, which is precisely positioned relative to the grinding disc base 200, ensuring the uniformity of the gap between the grinding rollers and the grinding disc. This sequence significantly improves the installation accuracy of key transmission and grinding components.
[0046] In one embodiment of the present invention, before step S730, the method further includes: Step B100: Erect the assembly platform; Erect the assembly platform on a leveled site near the vertical coal mill foundation. The assembly platform should have sufficient load-bearing capacity and stability, and its planar dimensions should be larger than the assembly outline dimensions of the grinding disc and grinding rollers.
[0047] Step B200: Assemble the grinding disc on the assembly platform; hoist the separate components of the grinding disc onto the assembly platform and assemble them with the platform surface as a reference.
[0048] Before step S740, the following are also included: Step B300: Assemble the grinding roller on the assembly platform. After the grinding disc is hoisted, the separate components of the grinding roller are hoisted to the assembly platform for assembly.
[0049] Specifically, the grinding disc and rollers of a vertical coal mill are heavy and have many components. If they are assembled directly at height, workers would need to perform frequent bolting, welding, and adjustment operations at high altitudes, resulting in high safety risks and low work efficiency. This invention pre-assembles the grinding disc and rollers on a ground-based assembly platform, transforming a large amount of high-altitude work into ground-based work. Construction workers can operate comfortably on a safe and stable platform, reducing safety risks such as falls from heights and improving working conditions.
[0050] In one embodiment of the present invention, step S200 includes: Step S210: The upper surface is roughened by high-pressure water jet or mechanical roughening; wherein the roughening depth is 5~10mm and the spacing between roughening points is no more than 50mm.
[0051] Specifically, high-pressure water jetting or mechanical roughening effectively removes the laitance layer and loose material from the surface of the foundation 300, creating a rough interface. Limiting the roughening depth to 5-10mm ensures sufficient roughness for mechanical interlocking, enhancing the bond strength between the grout layer and the foundation 300, while avoiding excessive roughening that could damage the aggregate structure of the foundation 300 concrete and affect its strength. The spacing between roughening points is no greater than 50mm, ensuring uniform coverage of the roughened surface without any missed areas, providing a comprehensive and reliable bonding interface for the grouting treatment.
[0052] The present invention also proposes a vertical coal mill, which is installed using the installation method of a vertical coal mill. The specific steps of the installation method of the vertical coal mill are as described in the above embodiments. Since the present vertical coal mill adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.
[0053] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of the present invention. Any equivalent structural transformations made based on the technical concept of the present invention and the contents of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the protection scope of the present invention.
Claims
1. A method for installing a vertical coal mill, characterized in that, The installation method includes the following steps: Set up the foundation for the vertical coal mill; The upper surface of the foundation is roughened, and the roughened upper surface is then subjected to a grouting process. The upper surface is ground and leveled; Determine a center reference point on the upper surface; The grinding disc base is installed on the upper surface according to the central reference point; Level the grinding disc base; The main body of the coal mill is installed on the grinding disc base to complete the installation of the vertical coal mill.
2. The installation method of the vertical coal mill as described in claim 1, characterized in that, Before the steps of roughening the upper surface of the foundation and applying grout to the roughened upper surface, the method further includes: A measurement grid is established on the upper surface; And measure the elevation of each grid intersection point; Detect the levelness of the upper surface; The step of grinding and leveling the upper surface includes: The upper surface is ground and leveled according to the levelness and the elevation of each grid intersection point.
3. The installation method of the vertical coal mill as described in claim 2, characterized in that, The grid spacing is no greater than 1000mm×1000mm, and the levelness deviation of the upper surface after grinding and leveling is no greater than 0.5mm / m².
4. The installation method of the vertical coal mill as described in claim 1, characterized in that, The step of determining the center reference point on the upper surface includes: Two steel wires are arranged on the upper surface, intersecting diagonally along the foundation, with the intersection of the two steel wires located at the center of the foundation. This intersection is then designated as the center reference point.
5. The installation method of the vertical coal mill as described in claim 4, characterized in that, The step of setting two steel wires intersecting diagonally along the foundation on the upper surface includes: Anchors for tensioning steel wires are pre-embedded at the four corners of the foundation; Tension gauges are used to control the tension of each steel wire, ensuring that the tension of each steel wire remains consistent. A plumb bob is suspended at the intersection of the two steel wires to verify the vertical alignment between the intersection and the center of the foundation.
6. The installation method of the vertical coal mill as described in claim 1, characterized in that, The step of leveling the grinding disc base includes: Multiple shims are spaced apart at the bottom of the grinding disc base; Multiple spaced reference points are set on the grinding disc base; The elevation of each reference point is detected, and the shims are adjusted according to the elevation of each reference point to level the grinding disc base.
7. The installation method of the vertical coal mill as described in claim 1, characterized in that, The steps of installing the coal mill body on the grinding disc base to complete the installation of the vertical coal mill include: A grinding roller stand is installed on the grinding disc base; A grinding roller stand and a speed reducer are installed on the grinding roller stand. The grinding disc and grinding body are installed on the reducer; The grinding roller is installed on the grinding roller stand; Install the air classifier on the mill body; The motor is mounted on the reducer.
8. The installation method of the vertical coal mill as described in claim 7, characterized in that, Before the step of installing the grinding disc and grinding body onto the reducer, the method further includes: Set up an assembly platform; The grinding disc is assembled on the assembly platform; Before the step of mounting the grinding roller onto the grinding roller stand, the method further includes: The grinding rollers are assembled on the assembly platform.
9. The installation method of the vertical coal mill as claimed in claim 1, characterized in that, The steps of roughening the upper surface of the foundation and applying grout to the roughened upper surface include: The upper surface is roughened using high-pressure water jet or mechanical chiseling; the chiseling depth is 5~10mm, and the spacing between chiseling points is no more than 50mm.
10. A vertical coal mill, characterized in that, The vertical coal mill is installed using the installation method of the vertical coal mill as described in any one of claims 1 to 9.