Anti-leakage vertical mill scraping frame structure

Abstract

A vertical mill scraping frame structure capable of preventing material leakage comprises a scraping frame fixing plate at the upper end, the scraping frame fixing plate is connected with a scraping frame lower ring at the lower end through a scraping frame cylinder, a lining plate and a scraping push plate are arranged below the scraping frame lower ring, the scraping push plate and the scraping frame lower ring form an L-shaped structure, and the lining plate is fixed to the scraping push plate through bolts. And a scraping frame reinforcing plate is arranged at the rear end of the scraping push plate. The scraping device is driven by the millstone seat to push materials falling into the lower machine body from the millstone seat, after the materials move in the cavity of the lower machine body for a circle, the materials are smoothly discharged from the discharging opening in one side, the novel scraping frame structure prevents the materials from spilling out of the cavity, and meanwhile it is guaranteed that the lining plate has good abrasion resistance.

Description

Technical Field

[0001] The utility model belongs to the field of vertical mills, and in particular relates to a material-leakage-proof vertical mill scraping device. Background Art

[0002] For the materials in the lower body cavity of the previous vertical mill, the scraper plate is used to rotate in a circular motion to push the materials to the discharge port on one side. In the cavity of the lower body 1, the scraper plate is used to rotate perpendicular to the tangent direction of the grinding disc seat to obtain the maximum scraping efficiency. This often ignores the impact of the materials on other parts in the cavity. When the liner 2 is scraping, there is continuous material falling from the grinding disc on the moving path relative to the liner 2, forming a uniform material layer. During the movement, the materials pile up more and more in front of the scraper liner, and the pile gets higher and higher until it passes the discharge port 3, and the materials in front of the scraper plate can be cleared. In the process from the beginning of the accumulation of materials to the disappearance of the material pile, because the material particle size is small, the material is subjected to thrust, and the material moves to the gaps on both sides like water, thereby causing pressure on the sealing gap 6 at the connection between the inner side of the lower body 1 and the grinding disc seat 4, and squeezed out from the sealing gap 6, causing leakage of the lower body 1, and damaging the environment outside the main machine. If the machine is shut down for maintenance and the gap between the grinding disc seat 4 and the lower machine body 1 is tightly sealed, the seal at the gap will soon fail as the grinding disc rotates, and the problem of material spillage will occur repeatedly. Utility Model Content

[0003] The utility model aims to solve the problem of material spillage. The utility model provides a leakage-proof vertical mill scraper frame structure, which is easy to replace, has good wear resistance, and is economical to manufacture. It can solve the problem of material spillage in the scraper frame action area from the source of the problem and solve the problem of excessive wear of the scraper plate.

[0004] The technical solution of the utility model is specifically as follows:

[0005] A leakage-proof vertical mill scraper frame structure comprises a scraper frame fixing plate at the upper end, the scraper frame fixing plate is connected to the scraper frame lower ring at the lower end through the scraper frame cylinder, a lining plate and a scraper push plate are arranged below the scraper frame lower ring, the scraper push plate and the scraper frame lower ring form an L-shaped structure, and the lining plate is fixed to the scraper push plate by bolts.

[0006] A scraper frame reinforcement plate is arranged at the rear end of the scraper push plate.

[0007] The lining plate is made of Mn16 steel plate.

[0008] The beneficial effects of the utility model are as follows: the scraper device, driven by the grinding disc seat, pushes the material that falls from the grinding disc seat into the lower body. After moving one circle in the cavity of the lower body, the material is smoothly discharged from the discharge port on one side. The new scraper frame structure prevents the material from spilling out of the cavity, and also ensures that the lining plate has good wear resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 Schematic diagram of the liner;

[0010] Figure 2 It is a schematic diagram of the position of the scraper frame 5 in the vertical mill;

[0011] Figure 3 This is a schematic diagram of the scraper frame in the utility model;

[0012] Figure 4 for Figure 3 Middle AA view;

[0013] Figure 5 Schematic diagram of the effect of liner angle on materials. DETAILED DESCRIPTION

[0014] 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.

[0015] 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.

[0016] like Figure 3 , Figure 4 and Figure 5 As shown, a leakage-proof vertical mill scraper frame 5 includes a scraper frame fixing plate 51 at the upper end, the scraper frame fixing plate 51 is connected to the scraper frame lower ring 53 at the lower end through a scraper frame cylinder 52, a lining plate 2 and a scraper push plate 54 are arranged below the scraper frame lower ring 53, the scraper push plate 54 and the scraper frame lower ring 53 form an L-shaped structure, the lining plate 2 is fixed to the scraper push plate 54 by bolts, so that the lining plate 2 can be structurally supported.

[0017] Furthermore, a scraper frame reinforcement plate 55 is provided at the rear end of the scraper push plate 54 to increase the structural strength of the scraper push plate 54 .

[0018] Furthermore, the lining plate 2 is made of Mn16 steel plate to ensure that the lining plate 2 has a certain wear resistance. The lining plate 2 is the main part in contact with the material. The structure connected by bolts can be replaced in time after wear to ensure the economy and use effect of the entire scraper frame.

[0019] Furthermore, there are 12 groups of lining plates 2 on the scraper frame 5, and the lining plates 2 are arranged below the scraper frame lower ring 53 along the circumferential direction. Since the side plates of the lining plates 2 are provided with baffle edges 21, the baffle edges 21 are arranged perpendicular to the lining plate body. In this way, each group of lining plates 2 has an angle of 5°+7°=12° with the normal to its movement direction, and 5° is the angle formed by the front of the lining plate 2 and the protruding baffle edge 21. The angle of 5° will cause the lining plate 2 to form a fan-shaped area when working. The fan-shaped area can accumulate part of the material, and the material forms a thin layer covering the front of the lining plate. When the lining plate 2 rotates, the lining plate 2 is effectively protected and the wear resistance of the lining plate is improved. The existence of 7° is a schematic diagram of the effect of the angle of the lining plate 2 on the material. Figure 5 The thrust provided in the direction a is equal to the thrust in the tangential direction b*sin (7°). The material can keep moving toward the outside of the lower body cavity, thereby reducing the accumulation of materials in the gap and the pressure of the materials on the gap between the lower body and the grinding disc seat, so that the material will not be squeezed out of the gap, ensuring the sealing of the lower body. The direction b (tangential direction of the circumference) is the material pushing direction when the liner moves normally.

[0020] The entire scraper frame 5 is fixed on the lower end surface of the grinding disc seat 4, and rotates with the rotation of the grinding disc seat 4, forming an annular scraping space inside the cavity of the lower body 1. The lining plate 2 maintains a 10mm gap with the inner wall of the lower body 1. On the one hand, even if the scraper frame 5 is not made with high precision, it is still not easy to interfere with the lower body 1 when rotating after installation; on the other hand, when there are materials with larger particle sizes in the material, it is ensured that the scraper frame 5 will not be stuck by the material. The rotation speed of the scraper frame 5 is the same as that of the grinding disc seat.

[0021] The material evenly dropped from the grinding disc seat is pushed by the scraper lining plate, moves one circle in the lower body cavity, and is smoothly discharged from the discharge port 3 on one side.

[0022] The utility model is designed to reduce the pressure of the material on the gap when the material is at the connection between the lower machine body 1 and the grinding disc seat 3. The liner 2 maintains a certain angle with the normal line of the rotation direction during rotation. When the material contacts the liner 2, there is a force applied to the outside, which keeps the material moving in the circumferential outer direction, and reduces the accumulation of materials and the pressure at the gap between the lower machine body 1 and the grinding disc seat 4, so that the material is not squeezed out of the gap, resulting in leakage of the lower machine body. On the other hand, when the liner maintains a certain angle with the normal line of the rotation direction during rotation, the material will slide sideways along the liner, increasing the wear of the liner. Therefore, on this basis, a baffle for blocking the material is added to the outside of the liner 2 to keep a part of the smaller moving material in front of the liner during movement. The material is used to protect the liner and reduce the impact and wear of other materials in the movement trajectory.

[0023] Therefore, when designing the scraper device, the main basis is to keep the material with the thrust of the lower body to the outside, and calculate the angle between the liner and the normal line of the moving direction according to the thrust. When there is thrust, the material will move slowly to the outside, and reduce the pressure on the inner gap of the lower body to ensure that the material is not squeezed out of the gap. The scraper device rotates in a circle relative to the fixed lower body, so it is an active scraper device.

[0024] In this way, when the vertical mill is working, the material crushed by the grinding roller falls from the grinding disc into the lower body chamber. The lower body chamber is an annular space. The scraper rack is installed on the grinding disc seat and rotates with the grinding disc seat. The scraper lining scrapes the material in the lower body cavity to the discharge port and discharges it from the vertical mill. In the process of scraping by the scraper lining, the material will accumulate in the gap between the grinding disc seat and the lower body. After long-term accumulation, the material will squeeze out of the lower body and spill onto the outside of the mill, causing pollution to the external environment. The new vertical mill scraper rack structure solves the problem of material accumulation at the connection between the grinding disc seat and the lower body from the root, and accumulates the material as much as possible on the outer side of the circumference of the lower body chamber. The material will not spill out of the lower body, and the material will be discharged smoothly from the vertical mill through the rotating movement of the scraper rack.

[0025] The scraper frame 5 can realize the following scraping functions during operation: 1. The scraper frame pushes the material out of the lower body smoothly; 2. The liner plate grinds the material in a material-to-material contact manner during the scraping process to avoid direct contact between the liner plate and the material, thereby improving the wear resistance of the liner plate; 3. The scraper frame structure can prevent the material from spilling out of the lower body cavity.

[0026] 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 leakage-proof vertical mill scraper frame structure, characterized in that: The scraper frame comprises an upper scraper frame fixing plate (51), the scraper frame fixing plate (51) being connected to a scraper frame lower ring (53) at the lower end via a scraper frame cylinder (52), a lining plate (2) and a scraper frame push plate (54) being arranged below the scraper frame lower ring (53), the scraper frame push plate (54) and the scraper frame lower ring (53) forming an L-shaped structure, and the lining plate (2) being fixed to the scraper frame push plate (54) via bolts.

2. The leakage-proof vertical mill scraper frame structure according to claim 1, characterized in that: A scraper frame reinforcement plate (55) is provided at the rear end of the scraper push plate (54).

3. The leakage-proof vertical mill scraper frame structure according to claim 1, characterized in that: The lining plate (2) is made of Mn16 steel plate.

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