Nested grinding roller structure

Abstract

The utility model provides a nested type grinding roller structure which comprises an assembling layer, a connecting layer and a grinding layer which are sequentially arranged in an annular nested mode from inside to outside, and concave-convex structures in the horizontal direction and the vertical direction are arranged on the outer surfaces of the assembling layer and the connecting layer respectively. The minimum inner diameter of the inner surface of the grinding layer is larger than the maximum inner diameter of the outer surface of the assembly layer. Cheap carbon steel is used in the inner layer, high-chromium alloy with high cost is used in the outer layer, and the problems of high cost, waste of raw materials and the like in the abrasion replacement process due to the fact that the whole body is cast by using the high-chromium alloy are solved; after the fixing of the assembly layer and the grinding layer is removed, the assembly layer can be taken out from the axial direction and replaced with a new grinding layer, so that a new assembly layer does not need to be cast again, the processing time of a new product is saved, the replacement efficiency is improved, and meanwhile, the cost is reduced to a certain extent by repeatedly using the assembly layer.

Description

Technical Field

[0001] This utility model relates to the field of grinding equipment processing technology, and in particular to a nested grinding roller structure. Background Technology

[0002] Powder manufacturing is a crucial part of modern industry. Many ores, such as calcium carbonate and barium sulfate, require pre-processing into powder form before further processing. Simultaneously, the increasing sophistication of modern industry places ever-higher demands on powder products. Existing powder production lines utilize ball mills and Raymond mills as the primary grinding equipment, coupled with conveyor belts to transport powder products and store them in storage rooms.

[0003] Raymond mill is the most common type of large-scale fine powder grinding equipment. It is widely used for fine powder processing of more than 280 kinds of materials in the mining, chemical and construction industries, such as barite, calcite, potassium feldspar, talc, marble, limestone, dolomite, fluorite, lime, activated clay, activated carbon, bentonite, kaolin, cement, phosphate rock, gypsum, glass, and insulation materials, with a Mohs hardness of no more than 9.3 and a moisture content of less than 6%. The finished particle size of Raymond mill can be adjusted arbitrarily within the range of 80-325 mesh, and some materials can reach up to 600 mesh.

[0004] The Raymond mill mainly consists of a casing, main unit, analyzer, fan, and discharge pipe. The main unit comprises a frame, inlet volute, shovel, grinding rollers, grinding ring, and cover. During operation, the material to be pulverized is fed into the mill through the feed hopper on the side of the cover. The grinding rollers, suspended on the main unit's frame, revolve around the vertical axis while simultaneously rotating on their own axis. Due to centrifugal force during rotation, the grinding rollers swing outwards, pressing tightly against the grinding ring. The shovel scoops up the material and delivers it between the grinding rollers and the grinding ring, where the rolling and crushing action of the grinding rollers achieves the purpose of pulverizing the material.

[0005] Because the grinding roller is in continuous contact with the external grinding ring during operation, it is subject to constant wear. After a period of use, when the surface of the grinding roller is severely worn, it can no longer maintain close contact with the grinding ring for effective grinding, at which point the grinding roller needs to be replaced. However, considering that the grinding roller needs to be made of high-hardness materials such as high-chromium alloy steel to maintain a long service life, its cost is quite high. Furthermore, since only the surface of the grinding roller is worn, a large amount of internal material is not directly used during replacement, resulting in considerable waste. Therefore, a more reasonable grinding roller structure is needed. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a nested grinding roller structure, which solves the problem of material waste caused by the high material cost of grinding rollers when they are replaced.

[0007] This utility model proposes a nested grinding roller structure, including an assembly layer, a connecting layer, and a grinding layer arranged in a ring from the inside to the outside. The outer surface of the assembly layer is a non-smooth surface, thus having concave and convex structures along the horizontal and vertical directions respectively. The outer surface of the connecting layer is also a non-smooth surface, thus having concave and convex structures along the horizontal and vertical directions respectively. The inner surface of the connecting layer is in close contact with the outer surface of the assembly layer, and the outer surface of the connecting layer is in close contact with the outer surface of the grinding layer. The minimum inner diameter of the inner surface of the grinding layer is greater than the maximum inner diameter of the outer surface of the assembly layer.

[0008] The assembly layer is made of carbon steel, the connecting layer is made of engineering plastic, and the grinding layer is made of high-chromium alloy.

[0009] Furthermore, the top and bottom ends of the outer surface of the assembly layer are respectively provided with outwardly protruding annular limiting portions, and the concave-convex structure of the outer surface of the assembly layer is disposed between the limiting portions at the top and bottom ends.

[0010] Furthermore, the top and bottom ends of the outer surface of the connecting layer are respectively provided with outwardly protruding annular limiting portions, and the concave-convex structure of the outer surface of the assembly layer is disposed between the limiting portions at the top and bottom ends.

[0011] Furthermore, the concave-convex structure includes a plurality of protrusions that protrude radially from the surface of the assembly layer or the connecting layer. The protrusions are arranged around the central axis of the grinding roller, and there is a gap between adjacent protrusions and a gap between the protrusions and the limiting part.

[0012] Furthermore, the protrusion has a square structure, and the edge of the protrusion and the limiting part or adjacent protrusion form a receiving groove that is parallel to the circumferential direction or perpendicular to the axial direction.

[0013] Furthermore, the axial length of the grinding layer is greater than the axial length of the connecting layer and the assembly layer, so that the bottom end of the grinding layer extends beyond the connecting layer and the assembly layer.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. This utility model has an assembly layer, a connecting layer and a grinding layer arranged in sequence. The connecting surfaces of the three have concave and convex structures along the horizontal and vertical directions respectively. At the same time, the three are tightly connected. Therefore, the concave and convex structures can achieve fixation in the horizontal and vertical directions. This not only makes the three tightly fitted into a whole and prevents slippage, but also limits the rotation direction of the grinding roller when it rotates, avoiding relative slippage and achieving overall rotation. In this way, the inner layer can use relatively inexpensive carbon steel, while the outer layer can use more expensive high-chromium alloy, avoiding the problems of high cost and material waste during wear and replacement caused by casting the whole high-chromium alloy.

[0016] 2. In this utility model, an engineering plastic connecting layer is provided between the assembly layer and the grinding layer. When the grinding layer is severely worn and needs to be replaced, the engineering plastic can be melted by heating, thereby releasing the fixation between the assembly layer and the grinding layer. Since the minimum inner diameter of the inner surface of the grinding layer is greater than the maximum inner diameter of the outer surface of the assembly layer, the assembly layer can be removed axially and a new grinding layer can be replaced. This eliminates the need to recast a new assembly layer, saves processing time for new products, improves replacement efficiency, and the reuse of the assembly layer also reduces costs to some extent. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the assembly layer and the connecting layer in an embodiment of this utility model.

[0018] Figure 2 This is a schematic diagram of the axial cross-section of an embodiment of the present invention.

[0019] In the above figures: 1. Assembly layer; 2. Connecting layer; 3. Grinding layer; 4. Limiting part; 5. Protrusion; 6. Receiving groove. Detailed Implementation

[0020] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0021] like Figure 1 As shown in the figure, this utility model embodiment proposes a nested grinding roller, including an assembly layer 1, a connecting layer 2, and a grinding layer 3 arranged in a ring-like nested manner from the inside to the outside. The assembly layer 1 is made of carbon steel, the connecting layer 2 is made of engineering plastic, and the grinding layer 3 is made of high-chromium alloy.

[0022] The outer surface of the assembly layer 1 is a non-smooth surface, thus having concave and convex structures along the horizontal and vertical directions respectively. The outer surface of the connecting layer 2 is a non-smooth surface, thus having concave and convex structures along the horizontal and vertical directions respectively. The inner surface of the connecting layer 2 is in close contact with the outer surface of the assembly layer 1, and the outer surface of the connecting layer 2 is in close contact with the outer surface of the grinding layer 3.

[0023] In this preferred embodiment, the top and bottom ends of the outer surface of the assembly layer 1 are respectively provided with outwardly protruding annular limiting portions 4, and the concave-convex structure of the outer surface of the assembly layer 1 is disposed between the top and bottom limiting portions 4. The top and bottom ends of the outer surface of the connecting layer 2 are respectively provided with outwardly protruding annular limiting portions 4, and the concave-convex structure of the outer surface of the assembly layer 1 is disposed between the top and bottom limiting portions 4.

[0024] Preferably, the concave-convex structure includes a plurality of protrusions 5 protruding radially from the surface of the assembly layer 1 or the connecting layer 2. The protrusions 5 are arranged around the central axis of the grinding roller, with gaps between adjacent protrusions 5 and between the protrusions 5 and the limiting portion 4. Further, the protrusions 5 are square structures, and the edges of the protrusions 5 form receiving grooves 6 parallel to the circumferential direction or perpendicular to the axial direction between the limiting portion 4 or adjacent protrusions 5. Therefore, in the direction around the rotation axis, the radial length difference is achieved through the protrusions 5 and the receiving grooves 6, maintaining fixation during rotation; in the axial direction, the radial length difference is achieved through the protrusions 5, the receiving grooves 6, and the limiting portion 4, maintaining axial fixation and preventing axial displacement between the assembly layer 1, the connecting layer 2, and the grinding layer 3. Further explanation is that portions of the inner surfaces of the connecting layer 2 and the assembly layer 1 protrude and extend into the receiving grooves 6, thereby achieving adjacency with the protrusions 5 and the receiving grooves 6, completing the limiting and fixing.

[0025] like Figure 2 As shown, in this embodiment, the minimum inner diameter of the inner surface of the grinding layer 3 is greater than the maximum inner diameter of the outer surface of the assembly layer 1. Therefore, after the connecting layer 2 melts, the assembly layer 1 can be directly removed axially, and a new grinding layer 3 can be replaced. This eliminates the need to recast a new assembly layer 1, saving processing time for new products. Furthermore, the axial length of the grinding layer 3 is greater than the axial lengths of the connecting layer 2 and the assembly layer 1, causing the bottom end of the grinding layer 3 to extend beyond the connecting layer 2 and the assembly layer 1. This ensures that when the connecting layer 2 is placed vertically, its bottom end does not contact the ground, preventing wear on the engineering plastic due to rotation and ensuring a stronger connection.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A nested grinding roller structure, characterized in that: The assembly layer, connecting layer, and grinding layer are arranged in a ring-like nested manner from the inside out. The outer surface of the assembly layer is a non-smooth surface, thus having concave and convex structures along the horizontal and vertical directions respectively. The outer surface of the connecting layer is a non-smooth surface, thus having concave and convex structures along the horizontal and vertical directions respectively. The inner surface of the connecting layer is in close contact with the outer surface of the assembly layer. The outer surface of the connecting layer is in close contact with the outer surface of the grinding layer. The minimum inner diameter of the inner surface of the grinding layer is greater than the maximum inner diameter of the outer surface of the assembly layer. The assembly layer is made of carbon steel, the connecting layer is made of engineering plastic, and the grinding layer is made of high-chromium alloy.

2. The nested grinding roller structure as described in claim 1, characterized in that: The top and bottom ends of the outer surface of the assembly layer are respectively provided with outwardly protruding annular limiting parts, and the concave-convex structure of the outer surface of the assembly layer is provided between the limiting parts at the top and bottom ends.

3. The nested grinding roller structure as described in claim 1, characterized in that: The top and bottom ends of the outer surface of the connecting layer are respectively provided with outwardly protruding annular limiting parts, and the concave-convex structure of the outer surface of the assembly layer is provided between the limiting parts at the top and bottom ends.

4. A nested grinding roller structure as described in claim 2 or 3, characterized in that: The concave-convex structure includes a plurality of protrusions that protrude radially from the surface of the assembly layer or the connecting layer. The protrusions are arranged around the central axis of the grinding roller, and there is a gap between adjacent protrusions and a gap between the protrusions and the limiting part.

5. The nested grinding roller structure as described in claim 4, characterized in that: The protrusion has a square structure, and the edge of the protrusion and the limiting part or adjacent protrusion form a receiving groove that is parallel to the circumferential direction or perpendicular to the axial direction.

6. The nested grinding roller structure as described in claim 1, characterized in that: The axial length of the grinding layer is greater than the axial length of the connecting layer and the assembly layer, so that the bottom end of the grinding layer extends beyond the connecting layer and the assembly layer.

Images