Thin plate vertical mill and its working method

Abstract

The application belongs to the technical field of material grinding application, and particularly discloses a thin-grinding-disc vertical mill, which comprises an upper shell, a hollow lower shell, a discharge port, a speed reducer, a grinding disc body, a grinding disc lining plate, second vertical bolts, a plurality of material scraping plates, horizontal bolts, a material distributing cone, a rocker arm and a grinding roller. The application has the advantages that, compared with the traditional vertical mill, the height of the grinding disc body is lower, the overall height of the equipment is reduced, the running stability is better, the specification requirement of the manufacturing equipment can be reduced, the assembly condition is reduced, and the manufacturing cost is lower; compared with the traditional vertical mill, the height of the grinding disc body is lower, the stability of the grinding disc is higher, and the vibration amplitude during the running of the vertical mill is smaller, so the civil foundation is smaller, and the civil construction cost is saved; compared with the traditional vertical mill, the grinding disc body has no cavity, the manufacturing difficulty is reduced, and the strength is greatly improved; compared with the traditional vertical mill, the material scraping plates are no longer installed below the grinding disc body but are installed at the outer edge of the grinding disc body, the height of the lower shell is reduced, and the structure is more compact.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of material grinding application, and particularly relates to a thin grinding disc vertical mill and a working method thereof. BACKGROUND

[0002] The vertical mill is a grinding equipment widely used in modern cement, chemical industry, coal and power departments, and integrates fine crushing, drying, grinding, powder selection and conveying. It is widely used in the grinding and superfine crushing of various solid materials of non-metallic minerals. It is more and more valued and adopted due to its small floor space, low power consumption, less steel consumption, integration of drying, grinding and powder selection, compact structure and easy operation.

[0003] The traditional vertical mill mainly comprises a motor, a speed reducer, a grinding disc device, a grinding roller, a rocker arm, a loading device, a shell and a powder selection device. In the traditional vertical mill, the material falls onto the grinding disc through the discharge inner cylinder. While the grinding disc rotates, the material is thrown outward under the action of the centrifugal force of the rotating grinding disc. The loading device acts force on the rocker arm so that the grinding roller has a certain rolling pressure on the material on the grinding disc. The rotation of the grinding disc also drives the rotation of the grinding roller. After grinding, the material is thrown out of the grinding disc under the action of the centrifugal force of the rotating grinding disc, enters the air ring, and the wind flows upward from the air ring. Under the action of the wind, the material is brought into the vertical mill powder classifier for classification. The fine particles of the product are selected out, and the relatively coarse particles directly return to the grinding disc for continuous grinding, forming a closed loop process until the material is ground to form a product.

[0004] The grinding disc of the traditional vertical mill has a hollow structure, and the overall height is high. The grinding disc and the speed reducer are connected at the bottom, so it is necessary to process a mounting hole connected with the speed reducer in the hollow cavity, which has high processing difficulty and cost. The material scraping plate is arranged at the lower part of the grinding disc, so the grinding disc needs to have a certain height straight section at the lower part to install the material scraping plate, which further increases the height of the grinding disc, and thus the pressure stability of the grinding disc is poor. In order to improve the pressure stability, the diameter of the grinding disc needs to be continuously increased, which leads to the increase of the size of the equipment and the high manufacturing and assembly cost. At the same time, the load is large and the vibration is large during the working process of the vertical mill, so the civil construction investment is large, which leads to low economic efficiency.

[0005] Therefore, based on the above problems, the present application provides a thin grinding disc vertical mill and a working method thereof. SUMMARY

[0006] The purpose of the present application is to provide a thin grinding disc vertical mill and a working method thereof, which solves the problems existing in the vertical mill in the prior art, i.e. simpler structure, lower manufacturing and assembly cost, smaller civil construction investment, more stable operation and higher stability.

[0007] Technical solution: The first aspect of the present application provides a thin grinding disc vertical mill, comprising an upper shell, a hollow lower shell, a plurality of vertical columns, a plurality of limiting systems and a plurality of hydraulic systems, the upper end surface of the upper shell is provided with a bottom cover, the center line of symmetry of the bottom cover is provided with a feeding port, the bottom surface edge of the hollow lower shell is provided with a discharge port, the bottom of the hollow lower shell is provided with a speed reducer, the hollow lower shell is provided with a grinding disc body connected with the speed reducer, the end surface edge of the grinding disc body is provided with a grinding disc liner, the grinding disc body and the grinding disc liner are fixedly assembled by a plurality of first vertical bolts, a plurality of grinding disc body mounting holes are arranged in the outer layer of the grinding disc body, the speed reducer and the grinding disc body are fixedly assembled by a second vertical bolt through the grinding disc body mounting hole, a plurality of scraping plates are arranged on the outer wall of the grinding disc body, the scraping plates are fixedly assembled on the grinding disc body by horizontal bolts, a plurality of scraping plates are arranged on the outer wall of the grinding disc body, the scraping plates are fixedly assembled on the grinding disc body by horizontal bolts, the center line of symmetry of the end surface of the grinding disc body is provided with a distribution cone in the inner layer of the grinding disc liner, the vertical columns are respectively provided with rocker arms, one end of the rocker arm is provided with a grinding roller matched with the grinding disc liner, the limiting system and the hydraulic system are matched with the rocker arm; wherein the material is fed through the feeding port, and is simultaneously distributed to the grinding disc liner by the distribution cone, the grinding disc body is driven by the speed reducer to rotate the grinding disc liner, the material on the surface of the grinding disc liner is ground by abutting the grinding roller, and the material is scraped by the scraping plate and discharged through the discharge port.

[0008] The thin grinding disc vertical mill further comprises a circular hollow limiting ring plate arranged on the edge end surface of the grinding disc body and located in the outer layer of the grinding disc liner.

[0009] The grinding disc liner is arranged in an arc-shaped structure, and the inner layer is lower and the outer layer is higher.

[0010] The scraping plate does not contact the lower inner wall and the bottom inner wall of the hollow lower shell.

[0011] The grinding disc body is arranged in a flat plate structure.

[0012] The second aspect of the present application provides a working method of a thin grinding disc vertical mill, comprising the following steps: S1, a plurality of limiting systems and a plurality of hydraulic systems are respectively connected to control the rocker arms, and the grinding roller at one end of the rocker arm abuts the surface of the grinding disc liner; S2, the material is fed through the feeding port, and is simultaneously distributed to the grinding disc liner by the distribution cone; S3, the speed reducer is started, and the grinding disc body is driven by the speed reducer to rotate the grinding disc liner, and the material on the surface of the grinding disc liner is ground by abutting the grinding roller; S4, a plurality of scraping plates arranged on the outer wall of the grinding disc liner scrape the ground material, and the material is discharged through the discharge port.

[0013] Compared with the prior art, the beneficial effects of the thin-disc vertical mill and its working method of the present invention are as follows: 1. Compared with the traditional vertical mill, the height of the mill disc in this solution is lower, which reduces the overall height of the equipment, thus improving operational stability. At the same time, the specifications of the manufacturing equipment can be reduced, the assembly conditions are simplified, and the manufacturing cost is lower; 2. Compared with the traditional vertical mill, the height of the mill disc in this solution is lower, the stability of the mill disc is higher, and the vibration amplitude during the operation of the vertical mill is smaller, thus requiring a smaller civil foundation and saving civil construction costs; 3. Compared with the traditional vertical mill, the mill disc in this solution has no internal cavity, which reduces the manufacturing difficulty and greatly improves the strength; 4. Compared with the traditional vertical mill, the scraper is no longer installed below the mill disc, but is installed on the outer edge of the mill disc, reducing the height of the lower shell and making the structure more compact. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments 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 these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of a thin-disc vertical mill according to the present invention;

[0016] The following numbers are labeled in the diagram: 1-bottom cover, 2-upper shell, 3-rocker arm, 4-circular hollow limiting ring plate, 5-grinding roller, 6-lower shell, 7-column, 8-reducer, 9-limiting device, 10-hydraulic system, 11-feed inlet, 41-distribution cone, 42-grinding disc body, 42-1-grinding disc body mounting hole, 43-grinding disc liner, 44-second vertical bolt, 45-scraper plate, 46-horizontal bolt, 61-discharge port, 47-first vertical bolt. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0018] In the description of this invention, it should be noted that the terms "top," "bottom," "one side," "the other side," "front," "back," "middle part," "inner," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0019] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. Example 1

[0020] like Figure 1 The thin-disc vertical mill shown includes an upper housing 2, a hollow lower housing 6, several vertical columns 7, several limiting systems 9, and several hydraulic systems 10.

[0021] A bottom cover 1 is provided on the upper end face of the upper housing 2.

[0022] The bottom cover 1 has a feed inlet 11 located along its symmetrical center line.

[0023] A discharge port 61 is provided on any bottom edge of the hollow lower shell 6.

[0024] A speed reducer 8 is installed at the bottom of the hollow lower shell 6.

[0025] The hollow lower housing 6 contains a grinding disc body 42 that is connected to the reducer 8.

[0026] A grinding disc liner 43 is provided on the edge of the end face of the grinding disc body 42.

[0027] The grinding disc body 42 and the grinding disc liner 43 are fixedly assembled together by a number of first vertical bolts 47.

[0028] The outer layer of the grinding disc body 42 has several grinding disc body mounting holes 42-1.

[0029] The reducer 8 and the grinding disc body 42 are fixedly assembled using the second vertical bolt 44 through the grinding disc body mounting holes 42-1.

[0030] The outer wall of the grinding disc body 42 is provided with several scraper plates 45 (including but not limited to horizontal L-shaped structures).

[0031] The scraper plates 45 are fixedly assembled onto the grinding disc body 42 by horizontal bolts 46.

[0032] A material distribution cone 41 is provided on the symmetrical center line end face of the grinding disc body 42 and located in the inner layer of the grinding disc liner 43.

[0033] Each of the vertical columns 7 is equipped with a rocker arm 3.

[0034] One end of the rocker arm 3 is respectively provided with a grinding roller 5 that cooperates with the grinding disc liner 43.

[0035] The limit system 9 and the hydraulic system 10 are used in conjunction with the rocker arm 3.

[0036] The material is fed through the feed inlet 11 and simultaneously diverted by the feed cone 41 into the grinding disc liner 43. The reducer 8 drives the grinding disc body 42 to rotate in conjunction with the grinding disc liner 43. The material on the surface of the grinding disc liner 43 is ground by the grinding roller 5 and scraped by the scraper 45 and discharged from the discharge port 61. Example 2

[0037] Based on Embodiment 1, the thin grinding disc vertical mill also includes a circular hollow limiting ring plate 4 disposed on the edge end face of the grinding disc body 42 and located on the outer layer of the grinding disc liner 43;

[0038] The inner layer of the circular hollow limiting ring plate 4 abuts against the outer layer of the grinding roller 5, which is used to limit the grinding roller 5 horizontally, so as to realize the efficient grinding operation of the surface material of the grinding disc liner plate 43.

[0039] In addition, the preferred grinding disc liner 43 is configured with an arc-shaped structure, with the inner layer being lower and the outer layer being higher; wherein, the grinding roller 5 abuts against the arc-shaped bend of the grinding disc liner 43, so as to achieve a tight fit between the grinding disc liner 43 and the grinding roller 5, and complete a high-quality grinding operation.

[0040] In addition, the preferred scraper 45 does not contact the lower inner wall and bottom inner wall of the hollow lower shell 6, and is used to scrape the ground material to discharge it to the discharge port 61, while also preventing material blockage.

[0041] In addition, the preferred grinding disc body 42 is set as a flat plate structure, so the blank can be forged. In contrast, traditional vertical mill grinding discs are generally cast, which is difficult to process, has a long cycle, and is costly. Various casting defects are prone to occur during the casting process. The grinding disc body 42 of this structure is forged, which is easy to process, has a short cycle, low cost, and high strength.

[0042] Meanwhile, the grinding disc mounting hole 42-1 is machined on the top surface of the grinding disc body 42, while the traditional vertical mill grinding disc mounting hole is at the bottom of the inner cavity of the grinding disc, which is difficult and costly to machine.

[0043] The present invention provides a method for operating a thin-disc vertical mill, comprising the following steps:

[0044] S1. The rocker arm 3 is controlled by several limit systems 9 and several hydraulic systems 10 in a coordinated manner, so that the grinding roller 5 at one end of the rocker arm 3 abuts against the surface of the grinding disc liner 43.

[0045] S2. The material is fed through the feed inlet 11 and simultaneously diverted by the feed cone 41 into the grinding disc liner 43.

[0046] S3. Start the reducer 8. At this time, the reducer 8 drives the grinding disc body 42 to rotate in conjunction with the grinding disc liner 43. The material on the surface of the grinding disc liner 43 is ground by abutting the grinding roller 5.

[0047] S4. Several scraper plates 45 are provided on the outer wall of the grinding disc liner 43 to scrape the ground material and discharge it through the discharge port 61.

[0048] The working principle or structural principle of the thin-disc vertical mill of the present invention:

[0049] The grinding disc body 42 has a flat plate structure without an inner cavity. Compared with the traditional vertical grinding disc, the overall height and weight are greatly reduced, resulting in lower manufacturing costs.

[0050] The scraper 45 is installed on the side of the grinding disc body 42, so the overall height of the grinding disc body 42 is greatly reduced. In the traditional vertical mill, the scraper is installed on the bottom of the grinding disc, which leads to an increase in the overall height of the grinding disc and an increase in manufacturing cost.

[0051] The millstone body has a low height of 42mm, resulting in good stability, low manufacturing and assembly costs, low equipment weight, and low vibration during operation. Therefore, the civil engineering construction cost is also lower than that of traditional vertical mills.

[0052] First, the material enters the vertical mill from the feed inlet 11, falls on the distribution cone 41, and is evenly distributed onto the grinding disc liner 43 of the grinding disc body 42.

[0053] Then, the grinding disc 42 is fixedly mounted on the reducer 8 through the grinding disc mounting hole 42-1 using the second vertical bolt 44. The reducer 8 drives the grinding disc 42, the grinding disc liner 43, and the material distribution cone 41 to rotate together. At this time, the material on the grinding disc liner 43 moves from the center of the grinding disc liner 43 to its edge under the action of centrifugal force. At the same time, the hydraulic system 10 loads the grinding roller 5 through the rocker arm 3 to grind the material between the grinding disc liner 43 and the grinding roller 5.

[0054] Finally, the ground material is thrown out from the edge of the grinding disc liner 43 and falls into the lower housing 6. Several scraper plates 45 are installed on the outer edge of the grinding disc body 42 by horizontal bolts 46 and rotate together with the grinding disc body 42. During their rotation, the material is scraped to the discharge port 61 and discharged from the discharge port 61.

[0055] It should be noted that, in this document, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0056] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A thin-disc vertical mill, comprising an upper housing (2), a hollow lower housing (6), several vertical columns (7), several limiting systems (9), and several hydraulic systems (10), characterized in that: The upper end face of the upper shell (2) is provided with a bottom cover (1). The bottom cover (1) has a feed inlet (11) along its symmetrical center line. The hollow lower shell (6) has a discharge port (61) on any bottom edge. A speed reducer (8) is provided at the bottom of the hollow lower shell (6). The hollow lower shell (6) is provided with a grinding disc (42) connected to the reducer (8). The end face edge of the grinding disc body (42) is provided with a grinding disc liner (43). The grinding disc body (42) and the grinding disc liner (43) are fixedly assembled by a number of first vertical bolts (47). The outer layer of the grinding disc body (42) is provided with a number of grinding disc body mounting holes (42-1). The reducer (8) and the grinding disc body (42) are fixedly assembled by the second vertical bolt (44) through the grinding disc body mounting holes (42-1). The outer wall of the grinding disc body (42) is provided with several scraper blades (45). The scraper blades (45) are fixedly assembled on the grinding disc body (42) by horizontal bolts (46). The end face of the symmetrical center line of the grinding disc body (42) and the inner layer of the grinding disc liner (43) are provided with a material distribution cone (41). The vertical column (7) is equipped with a rocker arm (3). One end of the rocker arm (3) is respectively provided with a grinding roller (5) that works in conjunction with the grinding disc liner (43). The limiting system (9) and the hydraulic system (10) are used in conjunction with the rocker arm (3); The material is fed through the feed inlet (11) and simultaneously diverted by the feed cone (41) into the grinding disc liner (43). The reducer (8) drives the grinding disc body (42) to rotate in conjunction with the grinding disc liner (43). The material on the surface of the grinding disc liner (43) is ground by the grinding roller (5) and scraped by the scraper (45) and discharged from the discharge port (61). The scraper (45) does not contact the lower inner wall and bottom inner wall of the hollow lower shell (6); the grinding disc (42) is set as a flat plate structure without an inner cavity; the grinding disc mounting hole (42-1) is machined on the top surface of the grinding disc (42).

2. A thin-disc vertical mill according to claim 1, characterized in that: The thin grinding disc vertical mill also includes a circular hollow limiting ring plate (4) disposed on the edge end face of the grinding disc body (42) and located on the outer layer of the grinding disc liner (43). The inner layer of the circular hollow limiting ring plate (4) abuts against the outer layer of the grinding roller (5) to limit the grinding roller (5) horizontally.

3. A thin-disc vertical mill according to claim 1, characterized in that: The grinding disc liner (43) is configured with an arc-shaped structure, with the inner layer being lower and the outer layer being higher; Among them, the grinding roller (5) abuts against the arc-shaped bend of the grinding disc liner (43).

4. The working method of a thin-disc vertical mill according to any one of claims 1-3, characterized in that: Includes the following steps, S1. The rocker arm (3) is controlled by several limit systems (9) and several hydraulic systems (10) respectively, so that the grinding roller (5) at one end of the rocker arm (3) abuts against the surface of the grinding disc liner (43). S2. The material is fed through the feed inlet (11) and simultaneously diverted by the feed cone (41) into the grinding disc liner (43); S3. Start the reducer (8). At this time, the reducer (8) drives the grinding disc body (42) to rotate in conjunction with the grinding disc liner (43). The material on the surface of the grinding disc liner (43) is ground by abutting the grinding roller (5). S4. Several scraper plates (45) on the outer wall of the grinding disc liner (43) scrape the ground material and discharge it through the discharge port (61).

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