Feed pipe of coal mill

Abstract

The utility model mainly relates to the field of coal conveying of coal mills, in particular to a feed pipe of a coal mill. The coal mill feeding pipe comprises a weighing feeder, a pipeline body and a coal mill, the two ends of the pipeline body are connected with the weighing feeder and the coal mill respectively, height difference exists between the weighing feeder and the coal mill, a first bend and a second bend are arranged on the pipeline body, the first bend is close to the weighing feeder, and the second bend is close to the coal mill. The second bend is close to the coal mill, a first reinforcing plate is arranged at the lower end of the first bend and extends to the second bend from the lower end of the first bend, a gap is formed between the first reinforcing plate and the outer wall of the first bend, and a wear-resistant material is poured in an interlayer formed by the gap. The wear-resistant material is filled in the gap interlayer between the reinforcing plate and the outer wall of the pipeline main body, so that the service life of a scouring point is prolonged, the contact between the material and a welding spot is isolated, and the welding spot is prevented from falling off.

Description

Technical Field

[0001] The utility model mainly relates to the field of coal conveying for coal mills, in particular to a feed pipe for coal mills. Background Art

[0002] In the coal slurry preparation process, the raw coal is crushed and screened, and then metered into the coal mill through the coal hopper and weighing feeder. The feed pipe of the coal mill has serious scouring points due to the continuous coal falling. Under continuous operation, it will wear out and cause leakage in half a year at most. The usual solution is to replace the wear-resistant material and add lining to the feed pipe. However, even so, it is repaired by welding and then reinforced every 2 months, and the feed pipe is replaced at most once a year, which increases production costs and reduces production efficiency.

[0003] The utility model patent with the announcement number "CN213762273U" and the name "A coal mill feed pipe" discloses a coal mill feed pipe. This technical solution makes a double-layer structure at the wear point of the feed pipe, welds a layer of steel plate on the outside of the easily worn pipe, and leaves a gap in the middle of the double-layer structure. When the inner pipe wears and leaks, the coal will enter the closed outer structure, and the falling coal will wash the coal accumulated here, so that the coal replaces the wear of the original wash point and will not cause wear to the outer pipe. This technical solution can extend the service life of the feed pipe to a certain extent, but the outer structure in this technical solution is only set at the wear point of the feed pipe, and because the raw material additives (alkaline water agent) and coal are accumulated inside the interlayer for a long time, the surrounding welds are easily corroded, forming leakage points, and there is even a risk of the outer structure falling off as a whole. Utility Model Content

[0004] In order to solve the problem that the outer layer structure of the coal mill feed pipe in the above-mentioned prior art only protects the local leakage point and the outer layer structure may fall off as a whole due to the raw material additives (alkaline water agent) and coal corroding the welding points.

[0005] The utility model proposes a coal mill feed pipe, comprising a weighing feeder, a pipe body and a coal mill, wherein two ends of the pipe body are respectively connected to the weighing feeder and the coal mill, and there is a height difference between the weighing feeder and the coal mill. A first bend and a second bend are arranged on the pipe body, wherein the first bend is close to the weighing feeder, and the second bend is close to the coal mill. A first reinforcing plate is arranged at the lower end of the first bend, and the first reinforcing plate extends from the lower end of the first bend to the second bend. A gap is arranged between the first reinforcing plate and the outer wall of the first bend, and a wear-resistant material is cast in the interlayer formed by the gap.

[0006] Furthermore, a second reinforcing plate is arranged at the lower end of the second bend, and the second reinforcing plate extends from the second bend to the coal mill. A gap is left between the second reinforcing plate and the first reinforcing plate and the coal mill. A gap is arranged between the second reinforcing plate and the outer wall of the second bend, and wear-resistant material is cast in the interlayer formed by the gap.

[0007] Furthermore, the pipeline body includes a second branch pipe, a first branch pipe and a third branch pipe respectively spliced ​​at both ends of the second branch pipe, the other end of the first branch pipe is connected to a weighing feeder, the other end of the third branch pipe is connected to a coal mill, the first bend is arranged at the second branch pipe near the first branch pipe, and the second bend is arranged at the third branch pipe near the second branch pipe.

[0008] Furthermore, the first branch pipe is connected to the second branch pipe via a flange, and the second branch pipe is connected to the third branch pipe via a flange.

[0009] Furthermore, the thickness of the gap between the first reinforcing plate and the first bent outer wall is greater than or equal to 80 mm.

[0010] Furthermore, the wear-resistant material is nylon engineering plastic, which is integrally cast in the interlayer.

[0011] Furthermore, the first reinforcement plate and the second reinforcement plate are made of steel plates.

[0012] Furthermore, the first reinforcement plate and the second reinforcement plate are connected to the pipeline body by welding.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The reinforcement plate originally only set at the wear-prone point is extended to the entire pipeline, which improves the protection of the entire coal mill feed pipe.

[0015] 2. The gap between the reinforcing plate and the outer wall of the pipe body is filled with wear-resistant materials to extend the life of the scouring point, while isolating the contact between the material and the welding point to prevent the welding point from falling off. Through experiments, the feed pipe of the same material has a longer service life after adopting this solution. Compared with a coal mill feed pipe disclosed in the utility model patent with announcement number "CN213762273U" and the name "a coal mill feed pipe", the service life of the feed pipe can be extended by 2-3 years.

[0016] Advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments, which are given as examples only with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the front view of the utility model.

[0018] In the figure: 1. pipeline body; 2. first reinforcing plate; 3. weighing feeder; 4. coal mill; 5. second reinforcing plate; 11. first bend; 12. second bend; 13. flange; 14. first branch pipe; 15. second branch pipe; 16. third branch pipe. DETAILED DESCRIPTION

[0019] The present application is further described below in conjunction with the accompanying drawings and embodiments.

[0020] like Figure 1 As shown, the utility model provides a feed pipe for a coal mill, comprising a weighing feeder 3, a pipe body 1 and a coal mill 4. The two ends of the pipe body 1 are respectively connected to the weighing feeder 3 and the coal mill 4, and there is a height difference between the weighing feeder 3 and the coal mill 4. The coal in the weighing feeder 3 can fall into the coal mill 4 through the pipe body 1 under the influence of its own gravity. A first bend 11 and a second bend 12 are arranged on the pipe body 1, the first bend 11 is close to the weighing feeder 3, and the second bend 12 is close to the coal mill 4. A first reinforcing plate 2 is arranged at the lower end of the first bend 11, and the first reinforcing plate 2 extends from the lower end of the first bend 11 to the second bend 12. The first reinforcing plate 2 extends from the first bend 11 to the second bend 12, which increases the wrapping area of ​​the pipe body 1, thereby increasing the protection area of ​​the pipe body 1 and avoiding the impact corrosion of coal on local welding points. A gap is provided between the first reinforcing plate 2 and the outer wall of the first bend 11. Preferably, the gap thickness is greater than or equal to 80 mm, and a wear-resistant material is cast in the interlayer formed by the gap. Preferably, the wear-resistant material is nylon engineering plastic. The wear-resistant material is cast in the interlayer formed by the gap to fill the interlayer, which can add a protective film to the pipeline, so that the coal wears the original pipeline wall and then impacts the friction wear-resistant material, avoiding the situation where the welding point falls off due to the accumulation of raw material additives (alkaline water agent) and coal, and prolonging the service life of the feed pipe.

[0021] Preferably, a second reinforcing plate 5 is provided at the lower end of the second bend 12, and the second reinforcing plate 5 extends from the second bend 12 to the coal mill 4, and a gap is left between the second reinforcing plate 5 and the first reinforcing plate 2 and the coal mill 4. A gap is provided between the second reinforcing plate 5 and the outer wall of the second bend 12, and a wear-resistant material is cast in the interlayer formed by the gap. Preferably, the wear-resistant material is nylon engineering plastic. Casting the wear-resistant material to fill the gap between the second bend 12 and the second reinforcing plate 5 is equivalent to adding a layer of protective film to the pipeline, avoiding corrosion of the welding point by the raw material additive (alkaline water agent) and coal accumulation, avoiding the situation of welding point falling off, and extending the service life of the feed pipe.

[0022] Preferably, the pipeline body 1 includes a second branch pipe 15, a first branch pipe 14 and a third branch pipe 16 respectively spliced ​​at both ends of the second branch pipe 15, the other end of the first branch pipe 14 is connected to the weighing feeder 3, and the other end of the third branch pipe 16 is connected to the coal mill 4. The first bend 11 is arranged at the second branch pipe 15 close to the first branch pipe 14, and the second bend 12 is arranged at the third branch pipe 16 close to the second branch pipe 15. In order to facilitate installation and maintenance, the first branch pipe 14 and the second branch pipe 15 are connected by a flange 13, and the second branch pipe 15 and the third branch pipe 16 are connected by a flange 13.

[0023] Preferably, the first reinforcing plate 2 and the second reinforcing plate 5 are made of steel plates. The first reinforcing plate 2 and the second reinforcing plate 5 are connected to the pipeline body 1 by welding.

[0024] When in use, the coal rolls down from the weighing feeder 3 to the first bend 11, falls to the second bend 12 through the second branch pipe 15, and enters the coal mill 4 through the third branch pipe 16. After the pipe body of the coal mill feed pipe is worn by coal for a long time, the wear-resistant material is exposed at the first bend 11 and the second bend 12. The wear-resistant material has wear-resistant performance and can continue to provide protection for the pipe, thereby extending the service life of the entire pipe.

[0025] In addition to the above embodiments, the present application may also have other implementation modes. Any technical solutions formed by equivalent replacement or equivalent transformation shall fall within the protection scope required by the present application.

Claims

1. A coal mill feed pipe, comprising a weighing feeder (3), a pipe body (1) and a coal mill (4), wherein two ends of the pipe body (1) are respectively connected to the weighing feeder (3) and the coal mill (4), and there is a height difference between the weighing feeder (3) and the coal mill (4). A first bend (11) and a second bend (12) are provided on the pipe body (1), wherein the first bend (11) is close to the weighing feeder (3), and the second bend (12) is close to the coal mill (4), and characterized in that: A first reinforcing plate (2) is arranged at the lower end of the first bend (11), and the first reinforcing plate (2) extends from the lower end of the first bend (11) to the second bend (12). A gap is arranged between the first reinforcing plate (2) and the outer wall of the first bend (11), and a wear-resistant material is cast in the interlayer formed by the gap.

2. A coal mill feed pipe according to claim 1, characterized in that: A second reinforcing plate (5) is arranged at the lower end of the second bend (12), and the second reinforcing plate (5) extends from the second bend (12) to the coal mill (4). A gap is left between the second reinforcing plate (5), the first reinforcing plate (2) and the coal mill (4). A gap is arranged between the second reinforcing plate (5) and the outer wall of the second bend (12), and a wear-resistant material is cast in the interlayer formed by the gap.

3. A coal mill feed pipe according to claim 1, characterized in that: The pipeline body (1) comprises a second branch pipe (15), a first branch pipe (14) and a third branch pipe (16) respectively spliced ​​at two ends of the second branch pipe (15); the other end of the first branch pipe (14) is connected to a weighing feeder (3); the other end of the third branch pipe (16) is connected to a coal mill (4); the first bend (11) is arranged at a position of the second branch pipe (15) close to the first branch pipe (14); and the second bend (12) is arranged at a position of the third branch pipe (16) close to the second branch pipe (15).

4. A coal mill feed pipe according to claim 3, characterized in that: The first branch pipe (14) and the second branch pipe (15) are connected via a flange (13), and the second branch pipe (15) and the third branch pipe (16) are connected via a flange (13).

5. A coal mill feed pipe according to claim 1, characterized in that: The thickness of the gap provided between the first reinforcing plate (2) and the outer wall of the first bend (11) is greater than or equal to 80 mm.

6. A coal mill feed pipe according to claim 2, characterized in that: The wear-resistant material is nylon engineering plastic, which is integrally cast in the interlayer.

7. A coal mill feed pipe according to claim 2, characterized in that: The first reinforcing plate (2) and the second reinforcing plate (5) are made of steel plates.

8. A coal mill feed pipe according to claim 2, characterized in that: The first reinforcing plate (2) and the second reinforcing plate (5) are connected to the pipeline body (1) by welding.

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