Material pressing device of sand-making vertical mill

Abstract

The utility model discloses a material pressing device of a sand-making vertical mill. A material pressing frame is fixed on a base through bolts; the material pressing frame comprises a material pressing plate at the top, the end part of the material pressing plate is an arc-shaped section, and the arc-shaped section is matched with the shape of the end part of the grinding roller; an annular material blocking ring is arranged below the material pressing plate, and the bottom of the annular material blocking ring is matched with the grinding disc in shape. The annular retaining ring is arc-shaped, the two ends are different in height, and the lower end is close to the grinding roller end. The whole pressing plate is in a sector ring shape, and a gap is formed between the arc-shaped section and the grinding roller. The material pressing device is arranged on the material inlet side of each grinding roller, a material layer is gathered in an effective grinding area of the grinding disc in a material pressing and flow guiding mode, meanwhile, part of unqualified large materials which are not ground are prevented from being discharged ineffectively, the grinding efficiency of the grinding rollers and the materials is improved, the height of a traditional material blocking ring can be properly reduced due to the use of the material pressing devices, and the grinding efficiency is improved. Therefore, the discharge of the materials is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of material control of vertical sand mills, and in particular relates to a material pressing device based on a vertical roller mill. Background Art

[0002] The vertical sand mill is also called vertical pre-grinding mill, which includes the upper shell 1 and the lower shell 2 of the mill. The principle is that the motor drives the grinding disc 3 to rotate through the reducer, and the material enters the center of the grinding disc from the top silo. As the grinding disc 3 rotates, the material moves to the edge of the grinding disc 3 under the action of centrifugal force. When the material moves to the bottom of the grinding roller 4, it is crushed by the grinding roller 4. The material in the grinding disc 3 passes over the retaining ring 5 under the action of centrifugal force and leaves the grinding disc 3. The material leaving the grinding disc 3 falls into the lower shell 2 of the mill under the action of gravity, and is then discharged from the mill with the assistance of a scraper device. The discharged material is sieved to obtain finished sand of different finenesses, and unqualified large particles can be recycled into the mill again. The existing structural units of the vertical sand mill are as follows: Figure 5 shown.

[0003] The thickness of the abrasive layer of the traditional sand-making device without pressure is mainly adjusted by the height of the retaining ring 5. The retaining ring 5 can block part of the material to the edge of the grinding disc 3 to form a material layer of a certain thickness, which helps the grinding roller to crush the material to a certain extent. At the same time, increasing the thickness of the material layer can improve the stability of the mill to a certain extent; but a large amount of finished ground sand will be mixed in the material layer below the retaining ring 5. These sands cannot be discharged from the grinding disc in time due to the influence of the height of the retaining ring 5, and a large amount of fine powder remains at the bottom of the grinding disc 3, which increases the fluidity of the material layer. In addition, there is only a traditional retaining ring 5 structure, and there is a large area of ​​non-active area between the grinding rollers 4, which will cause a large amount of large-particle non-finished (unrolled or unqualified) materials to be discharged, and a large amount of finished sand will be repeatedly squeezed ineffectively, resulting in reduced grinding efficiency, increased ineffective circulation, increased system power consumption, and low output. Utility Model Content

[0004] In order to solve the problems existing in the above-mentioned traditional sand-making vertical mill, such as poor controllability of material layers, large amount of ineffective circulation of non-finished materials, large amount of ineffective repeated extrusion of finished sand materials, low grinding efficiency, high system power consumption, low output, etc., the utility model provides a material pressing device related to the sand-making vertical mill.

[0005] The technical solution of the utility model is specifically as follows:

[0006] A material pressing device for a sand-making vertical mill comprises a material pressing frame which is fixed to a base by bolts; the material pressing frame comprises a material pressing plate at the top, the end of which is an arc segment which matches the shape of the end of a grinding roller; an annular material retaining ring is arranged below the material pressing plate, the bottom of which matches the shape of a grinding disc; the annular material retaining ring is in the shape of an arc, the two ends of which are of different heights, and the lower end is close to the end of the grinding roller.

[0007] The pressing plate is in the shape of a fan ring as a whole, and a gap of 15 mm is provided between the arc segment and the grinding roller.

[0008] The gap between the bottom of the annular retaining ring and the grinding disc is 5mm.

[0009] A wear-resistant layer is arranged on the inner side of the annular retaining ring, and the wear-resistant surface HRC≥50; a wear-resistant layer is arranged under the top pressure plate, and the wear-resistant surface HRC≥50.

[0010] A reinforcing connecting plate is arranged on the top of the pressing plate, and is connected to the base through the reinforcing connecting plate.

[0011] The base comprises a base flat connecting plate, a base vertical connecting plate is connected to the base flat connecting plate, a vertical long hole is opened on the base vertical connecting plate, and a long hole toward the center of the grinding disc is opened on the base flat connecting plate.

[0012] The beneficial effects of the utility model are as follows: a material pressing device is installed on the material inlet side of each grinding roller, and the material layer is gathered in the effective grinding area of ​​the grinding disc by means of material pressing and diversion, while blocking the ineffective discharge of some unqualified and un-rolled large materials, thereby improving the grinding efficiency of the grinding roller and the material. The use of the material pressing device allows the height of the traditional material retaining ring to be appropriately reduced, which is more conducive to the discharge of the material and reduces the time of the finished sand material on the grinding disc. The overall effect can effectively improve the sand making efficiency, save energy consumption and increase output. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is an overall schematic diagram of the utility model;

[0014] Figure 2 It is the front view of the utility model;

[0015] Figure 3 It is a top view of the utility model;

[0016] Figure 4 is a schematic diagram of the structure of the base;

[0017] Figure 5 This is a schematic diagram of the structure of a sand making vertical mill;

[0018] Figure 6 Installation diagram of the pressing device Figure 1 ;

[0019] Figure 7 Installation diagram of the pressing device Figure 2 ;

[0020] Figure 8 Installation diagram of the pressing device Figure 3 . DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0023] like Figure 1-8 As shown, a material pressing device 6 for a vertical sand mill includes a material pressing frame 61, which is fixed to a base 62 by bolts 63. The material pressing frame 61 includes a material pressing plate 611 at the top, and the end of the material pressing plate 611 is an arc segment 612, which matches the shape of the end of the grinding roller 4; an annular material blocking ring 613 is arranged below the material pressing plate 611, and the bottom of the annular material blocking ring 613 matches the shape of the grinding disc 3, and the gap between the bottom of the annular material blocking ring 613 and the grinding disc 3 is 5mm, the purpose is to better block the material and guide the flow, and prevent the material to be acted on from being discharged from the grinding disc 3 under the action of centrifugal force.

[0024] like Figure 2 , Figure 3 As shown, further, the pressing plate 611 is in the shape of a fan ring as a whole, and the end of the fan ring is an arc segment 612. A gap of 15 mm is provided between the arc segment 612 and the grinding roller 4, in order to reduce the loss of materials at the feeding port at the bottom of the grinding roller 4.

[0025] Furthermore, the annular material retaining ring 613 is arc-shaped, with different heights at both ends, and the lower end is close to the end of the grinding roller 4. In this way, after the entire pressing frame 61 is installed, the top pressing plate 611 has an angle inclined toward the bottom of the grinding roller 4 when viewed horizontally. The design of the inclined angle is beneficial to the flow of materials to the bottom of the grinding roller 4 during the pressing and guiding process, thereby increasing the probability of interaction between the material and the grinding roller 4 and improving the sand making efficiency.

[0026] Furthermore, the outer radius of the annular material retaining ring 613 is preferably 10 mm smaller than the top radius of the inner side action arc surface of the grinding disc, in order to control the material layer gathering area within the effective rolling diameter area of ​​the grinding roller.

[0027] A wear-resistant layer is provided on the inner side of the annular retaining ring 613, and the wear-resistant surface has an HRC of ≥50; a wear-resistant layer is provided on the lower side of the top pressing plate 611, and the wear-resistant surface has an HRC of ≥50.

[0028] Furthermore, a reinforcing connecting plate 614 is provided on the top of the pressing plate 611 , and the base 62 is connected via the reinforcing connecting plate 614 .

[0029] The vertical sand mill press device 6 is fixed to the mill housing through a base 62. The base 62 can be fixed to the mill housing by welding, bolting, etc. The vertical sand mill press device 6 can adjust the vertical height and the front-to-back distance from the center of the grinding disc. The base 62 includes a base flat connecting plate 621, and the base flat connecting plate 621 is connected to the press plate 611 through a reinforcing connecting plate 614. The base flat connecting plate 621 is connected to a base vertical connecting plate 622, such as Figure 4 Preferably, a vertical strip hole is opened on the vertical connecting plate 622 of the base to facilitate the adjustment of the vertical height of the sand making vertical mill press device 6, and a strip hole toward the center of the grinding disc can be opened on the flat connecting plate 621 of the base to adjust the front-rear distance relative to the center of the grinding disc.

[0030] like Figure 6 , Figure 7 and Figure 8 As shown, the entire press frame 61 occupies about half of the arc space between the two grinding rollers 4 from a top view, so that it can guide and press materials over a large area and gather more materials in the effective grinding area of ​​the grinding disc without affecting the timely discharge of materials; through the added sand-making vertical mill press device 6, the height of the traditional material retaining ring 5 can be reduced by about 50%. The low height of the traditional material retaining ring is conducive to the timely discharge of finished materials, reduces invalid circulation, and improves efficiency; the press frame and the base are designed to be separated and connected by connecting bolts.

[0031] The principle adopted by the utility model is: a sand-making vertical mill pressing device 6 is installed on the material inlet side of each grinding roller 4, and the material layer is gathered in the effective grinding area of ​​the grinding disc 3 by pressing and diverting the material, while blocking the ineffective discharge of some unqualified and un-rolled large materials, thereby improving the grinding efficiency of the grinding roller 3 and the material. The use of the sand-making vertical mill pressing device 6 allows the height of the traditional material retaining ring 5 to be appropriately reduced, which is more conducive to the discharge of the material and reduces the time of the finished sand material on the grinding disc. The overall effect can effectively improve the sand-making efficiency, save energy consumption, and increase production.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be regarded as the protection scope of the present invention.

Claims

1. A sand making vertical mill pressing device, characterized in that: The invention comprises a material pressing frame (61), wherein the material pressing frame (61) is fixed on a base (62) by bolts (63); the material pressing frame (61) comprises a material pressing plate (611) at the top, wherein the end of the material pressing plate (611) is an arc segment (612), and the arc segment matches the shape of the end of the grinding roller (4); an annular material retaining ring (613) is arranged below the material pressing plate (611), and the bottom of the annular material retaining ring (613) matches the shape of the grinding disc (3); the annular material retaining ring (613) is in an arc shape, and the heights of the two ends are different, and the lower end is close to the end of the grinding roller (4).

2. The sand making vertical mill pressing device according to claim 1 is characterized in that: The pressing plate (611) is in the shape of a fan ring as a whole, and a gap of 15 mm is provided between the arc segment (612) and the grinding roller (4).

3. The material pressing device for a sand making vertical mill according to claim 1, characterized in that: The gap between the bottom of the annular retaining ring (613) and the grinding disc (3) is 5 mm.

4. The sand making vertical mill pressing device according to claim 1, characterized in that: A wear-resistant layer is provided on the inner side of the annular retaining ring (613), and the wear-resistant surface has an HRC of ≥50; a wear-resistant layer is provided on the lower side of the top pressing plate (611), and the wear-resistant surface has an HRC of ≥50.

5. The material pressing device for a sand making vertical mill according to claim 1, characterized in that: A reinforcing connecting plate (614) is provided on the top of the pressing plate (611), and is connected to the base (62) via the reinforcing connecting plate (614).

6. The material pressing device for a sand-making vertical mill according to claim 1, characterized in that: The base (62) comprises a base flat connecting plate (621), a base vertical connecting plate (622) is connected to the base flat connecting plate (621), a vertical long hole is opened on the base vertical connecting plate (622), and a long hole is opened on the base flat connecting plate (621) towards the center of the grinding disc.

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