Lightweight mill body structure of coal mill

Abstract

The utility model relates to a light-weight mill body structure of a coal mill, and belongs to the technical field of grinding equipment. Comprising a cylinder body, end plate units are arranged at the two ends of the cylinder body respectively, a hollow shaft penetrates through the centers of the end plate units respectively, and the cylinder body, the end plate units and the hollow shaft are of an integrated structural part; a barrel lining plate is arranged on the inner wall of the barrel, end lining plates are arranged at the two ends of the barrel lining plate respectively, the end lining plates are arranged on the inner sides of the end plate units, and the end lining plates and the end plate units are fixedly connected through bolts; a large gear is arranged on the periphery of the cylinder body and fixedly connected with the cylinder body through a flange. The end plate unit comprises an inner end plate and an outer end plate, and the inner end plate and the outer end plate are arranged in parallel. The hollow shaft is a casting part, and the inner end plate and the outer end plate are steel plate parts. Manufacturing is convenient, the weight of the mill body is reduced, and therefore the installed power and pulping energy consumption are reduced; accumulative errors in the installation process of the grinding body are reduced, and abnormal meshing phenomena of gear pairs such as vibration, noise and temperature rise are avoided.

Description

Technical Field

[0001] This utility model relates to a lightweight coal mill grinding body structure, belonging to the technical field of grinding equipment. Background Technology

[0002] A coal mill is a machine that grinds coal after it has been crushed; it is an important auxiliary device for gasifiers. A rod mill is a type of coal mill that uses a certain number of steel rods as grinding media inside a cylinder. Coal mills are energy-intensive, heavy-duty equipment; their power is closely related to the weight of the mill body. Reducing the weight of the mill body can lower the installed power and slurry preparation energy consumption.

[0003] Traditional grinding media, such as Figure 1 As shown, the cylinder, large end cover, and large gear are connected by bolts. Each part is machined independently. In particular, the journal of the large end cover needs to be reversed and machined with the large flange. The perpendicularity error between the end face and the journal is mostly adjusted by the operator, resulting in a large error in a single part. Moreover, the error direction deviation of each part is also large. The cumulative error after the three parts are installed often causes the radial runout and end face runout of the large gear to the coaxial hollow shaft of the two large end covers to be too large, causing abnormal phenomena such as vibration, noise, and temperature rise to occur when the large and small gears are running. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a lightweight coal mill body structure that is easy to manufacture, reduces the weight of the mill body and thus reduces the installed power and pulping energy consumption; reduces cumulative errors and avoids abnormal meshing of gear pairs such as vibration, noise, and temperature rise.

[0005] The technical solution adopted by this utility model to solve the above problems is as follows: a lightweight coal mill body structure, including a horizontally arranged cylinder, end plate units respectively provided at both ends of the cylinder, and hollow shafts passing through the center of each end plate unit, the cylinder, end plate units and hollow shafts being an integral structural component; a cylinder liner is provided on the inner wall of the cylinder, and end liners are provided at both ends of the cylinder liner, the end liners being located inside the end plate units, and the two being fixedly connected by bolts; a large gear is provided on the outer periphery of the cylinder, and the large gear is fixedly connected to the cylinder through a flange.

[0006] The end plate unit includes an inner end plate and an outer end plate, and the inner end plate and the outer end plate are arranged in parallel.

[0007] The inner end plate and the outer end plate are perpendicular to the hollow shaft, respectively.

[0008] The inner end of the hollow shaft abuts against the end liner.

[0009] The hollow shaft is a cast part, and the inner end plate and outer end plate are steel plate parts.

[0010] Compared with the prior art, the advantages of this utility model are: a lightweight coal mill body structure that is easy to manufacture, reduces the weight of the mill body, thereby reducing the installed power and slurry energy consumption; reduces the cumulative error during the installation of the mill body, and avoids abnormal meshing of gear pairs such as vibration, noise, and temperature rise. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of a traditional coal mill body;

[0012] Figure 2 This is a schematic diagram of a lightweight coal mill body structure according to an embodiment of the present invention;

[0013] In the diagram: 1. Hollow shaft; 2. Outer end plate; 3. Inner end plate; 4. End liner; 5. Cylindrical liner; 6. Cylindrical body; 7. Flange; 8. Large gear. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0015] like Figure 2 As shown in this embodiment, a lightweight coal mill body structure includes a horizontally arranged cylinder 6. End plate units are respectively installed at both ends of the cylinder 6, and hollow shafts 1 pass through the centers of the end plate units. The cylinder, end plate units, and hollow shafts 1 are integrated structural components. A cylinder liner 5 is installed on the inner wall of the cylinder 6, and end liners 4 are respectively installed at both ends of the cylinder liner 5. The end liners 4 are located inside the end plate units and are fixedly connected to the end plate units by bolts. The inner end of the hollow shaft 1 abuts against the end liners 4. A large gear 8 is provided on the outer periphery of the cylinder 6, and the large gear 8 is bolted to the cylinder 6 via a flange 7. The cylinder is precision-machined on the same machine tool in a single setup, and the error is the machine tool's own precision error. After assembling the large gear, its radial runout and end face runout can be controlled within 0.3~0.5mm, significantly reducing cumulative errors and avoiding abnormal gear meshing phenomena such as vibration, noise, and temperature rise.

[0016] The end plate unit includes an inner end plate 3 and an outer end plate 2. The inner end plate 3 and the outer end plate 2 are arranged parallel to each other, and both the inner and outer end plates are perpendicular to the hollow axis. The end plate unit adopts a double-layer structure, and its cumulative thickness and weight can be reduced by 200% compared to a single-layer unit. Figure 1 As shown, the hollow shaft of the conventional grinding media's large end cap forms an R-zone at the connection with the large conical surface of the cylindrical body. This R-zone is subjected to alternating fatigue stress during grinding media operation, and casting defects are prone to occur during casting. To ensure the normal and stable operation of the grinding media, large end caps with casting defects in the R-zone are typically scrapped. This application cleverly eliminates the possibility of these defects.

[0017] The hollow shaft is a cast part, while the inner and outer end plates are made of steel plates. This reduces the weight of the mill body, thereby reducing the installed power and pulping energy consumption, and also saves costs.

[0018] This application is easy to manufacture, reduces the weight of the mill body, thereby reducing the installed power and pulping energy consumption; it also reduces the cumulative error during the installation of the mill body and avoids abnormal meshing of gear pairs such as vibration, noise, and temperature rise.

[0019] In addition to the above embodiments, this utility model also includes other implementation methods. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of this utility model.

Claims

1. A lightweight coal mill body structure, characterized in that: The device includes a horizontally arranged cylindrical body, with end plate units at both ends of the cylindrical body and hollow shafts passing through the centers of the end plate units. The cylindrical body, end plate units, and hollow shafts are an integral structural component. A cylindrical body liner is provided on the inner wall of the cylindrical body liner, with end liners at both ends of the liner. The end liners are located inside the end plate units and are fixedly connected by bolts. A large gear is provided on the outer periphery of the cylindrical body, and the large gear is fixedly connected to the cylindrical body by a flange.

2. The lightweight coal mill body structure according to claim 1, characterized in that: The end plate unit includes an inner end plate and an outer end plate, and the inner end plate and the outer end plate are arranged in parallel.

3. The lightweight coal mill body structure according to claim 2, characterized in that: The inner end plate and the outer end plate are perpendicular to the hollow shaft, respectively.

4. The lightweight coal mill body structure according to claim 1, characterized in that: The inner end of the hollow shaft abuts against the end liner.

5. The lightweight coal mill body structure according to claim 2, characterized in that: The hollow shaft is a cast part, and the inner end plate and outer end plate are steel plate parts.

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