Vertical mill feeding pre-sorting device

Abstract

The utility model provides a vertical mill feeding pre-sorting device which comprises a blanking pipe and a pre-sorting structure, and the discharging end of the blanking pipe is connected with the pre-sorting structure. The blanking pipe comprises a pipe body I; the pre-sorting structure comprises a pipe body II, an air inlet pipe, a material dispersing plate and a gas outlet; one side of the pipe body II is provided with the gas outlet, and the other side of the pipe body II is connected with an air inlet pipe; a material scattering plate is arranged at the joint of the air inlet pipe and the second pipe body. The air inlet pipe is connected with a vertical mill air inlet pipe through an air inducing pipe; the air inlet pipe of the pre-sorting discharging pipe is connected with the air inlet pipe of the vertical mill through the air pipe, and due to the fact that the negative pressure at the gas outlet is larger than that of the air inlet pipe of the vertical mill, part of high-temperature air can be led into the air inlet pipe by means of the negative pressure in the mill. Fine-particle materials are brought into the powder concentrator in advance to be sorted, and large-particle materials fall onto the grinding disc to be ground. The grinding stability is good, and the yield is high. And the mill is less in over-grinding and low in grinding power consumption.

Description

Technical Field

[0001] The utility model belongs to the field of vertical mill grinding, in particular to a vertical mill feed pre-sorting device. Background Art

[0002] Vertical mills are widely used in cement, ore and non-metallic grinding fields. They are recognized by the market for their compact structure and low power consumption. The raw materials of the vertical mill enter the feeding pipe of the vertical mill through the feeding belt, and the raw materials are transported to the middle of the grinding disc. Under the action of centrifugal force, the raw materials are evenly spread on the grinding disc, and the grinding roller grinds the materials. Now with the large-scale promotion of machine-made sand, the screened materials of sand-making products need to be re-grinded by the vertical mill system before use. Because these screened materials have small particle size and contain 20~40% of finished fine powder, after they are fed into the mill, the material layer stability is poor, the grinding roller vibrates greatly when rolling, and the output is low. Moreover, the finished fine powder is rolled again, there is a serious over-grinding, and the power consumption of the mill is high. Summary of the invention

[0003] In order to solve the above problems, the present invention discloses a vertical mill feed pre-sorting device, which can sort the materials in advance during the feeding process of the mill through the bulk plate and the blowing structure, bring the fine particle materials into the powder classifier for sorting in advance, and the large particle materials fall to the grinding disc for grinding. The grinding stability is good and the output is high. The mill has less over-grinding and low power consumption.

[0004] A vertical mill feed pre-sorting device comprises a material dropping pipe and a pre-sorting structure, wherein the discharge end of the material dropping pipe is connected to the pre-sorting structure; the material dropping pipe comprises a tube body 1; the pre-sorting structure comprises a tube body 2, an air inlet pipe, a bulk plate and a gas outlet; wherein one side of the tube body 2 is provided with the gas outlet and the other side is connected to the air inlet pipe; wherein a bulk plate is provided at the connection between the air inlet pipe and the tube body 2; the air inlet pipe is connected to the air inlet pipe of the vertical mill through an air induced draft pipe; the air inlet pipe of the pre-sorting material dropping pipe is connected to the air inlet pipe of the vertical mill through an air duct, and since the negative pressure at the gas outlet is greater than the negative pressure of the air inlet pipe of the vertical mill, a part of the high-temperature air can be introduced into the air inlet pipe by relying on the negative pressure inside the mill.

[0005] The air duct is provided with a flap valve and a hose in sequence; the soft connecting pipe prevents the vibration of the mill from being transmitted to the air inlet pipe of the vertical mill, thereby avoiding damage to the pipe. The flap valve can adjust the blowing and selecting air volume in time according to the content of fine powder in the material, so as to adapt to the grinding of different materials.

[0006] Furthermore, a plurality of side wear-resistant plates are respectively provided on both sides of the blanking pipe.

[0007] Furthermore, a plurality of groups of bottom edge wear-resistant plates and bottom plate vertical plates are provided at the bottom of the drop tube.

[0008] In order to prevent material wear, multiple side wear plates are welded on both sides of the drop tube. In order to reduce the impact of materials falling from the top, multiple sets of bottom wear plates and bottom vertical plates are set on the bottom. When the material falls, it accumulates between the two bottom vertical plates to form a deposited material pad. When the material falls from the top, it hits the material pad and slightly wears the tube body.

[0009] Furthermore, a bottom wear-resistant plate 2 is provided at the bottom of the second tube body and side wear-resistant plates 2 are provided on both sides.

[0010] Furthermore, the tube body is a barrel-shaped structure with a rectangular cross-section.

[0011] The working principle of the utility model is:

[0012] Fine particles enter the drop pipe through the feeding belt and roll down; passing through the bulk plate of the second tube body, the materials are broken up and separated, and are fully blown and selected by the high-speed wind of the air inlet pipe. The wind carries the fine particles out from the gas outlet on the upper part of the bulk plate and enters the powder classifier for sorting. Since the gas outlet is designed at the upper part of the bulk plate, the wind needs to be turned before it can be discharged. The large particles blown by the wind are not easy to turn due to inertia, and will continue to fall and fall to the center of the grinding disc. Through the rotation of the grinding disc, they are dispersed to the bottom of the grinding roller and ground by the grinding roller. The wind speed of the air inlet pipe can be adjusted in real time through the opening of the flap valve to adapt to the grinding of different materials. Since the pre-sorting brings the fine particles in the raw materials into the powder classifier for sorting in advance, the materials that fall on the grinding disc are mostly large particles. The material layer is stable when the grinding roller is rolling, the output is high, the over-grinding is less, and the power consumption is low.

[0013] Beneficial effects of the utility model:

[0014] 1. The utility model uses the bulk plate and the blowing structure to sort the materials in advance during the milling process, and brings the fine-grained materials into the powder classifier for sorting in advance, and the large-grained materials fall onto the grinding disc for grinding. The grinding stability is good and the output is high. The mill has less over-grinding and low power consumption.

[0015] 2. The upper material drop pipe of the utility model reduces the impact caused by the falling of materials by piling up material pads, reduces the wear of the pipe, and increases the service life.

[0016] 3. The utility model uses the negative pressure inside the mill to introduce the air entering the branch pipe into the discharge pipe for pre-sorting, and does not require an additional fan structure, has a simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 2 It is a top view of the connection between the blanking tube and the pre-sorting structure of the utility model;

[0019] Figure 3 This utility model Figure 2 AA view;

[0020] Figure 4 This utility model Figure 3 Detailed drawing of location Ⅰ.

[0021] List of reference numerals:

[0022] 1-flexible connecting pipe, 2-flap valve, 3-induction duct, 4-dropping pipe, 5-pre-sorting structure; 6-vertical mill air inlet pipe, 7-air duct, 8-grinding disc, 9-mill frame, 10-grinding roller, 11-rocker arm, 12-mill middle shell, 13-powder classifier, 4a-tube body 1, 4b-side wear-resistant plate, 4c-bottom wear-resistant plate 1, 5a-tube body 2, 5b-air inlet pipe, 5c-bulk material plate, 5d-bottom wear-resistant plate 2, 5e side wear-resistant plate 2, 5f-gas outlet. DETAILED DESCRIPTION

[0023] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0024] like Figure 1 As shown, the mill frame 9 is fixed on the ground, and the rocker arm 11 is fixed on the mill frame 9, which can turn up and down along the center of the rocker arm 11 with the grinding roller 10 hinged on it. The grinding disc 8 is driven by the reducer below to rotate along its own axis, which drives the multiple grinding rollers 10 pressed on it to rotate, so that the grinding rollers 10 can grind the materials on the grinding disc 8; an annular air duct is designed between the grinding disc 8 and the mill frame 9, and the air duct has two air inlets, which are connected to the external vertical mill air inlet pipe 6. The hot air enters the air duct through the vertical mill air inlet pipe 6, and is blown into the vertical mill middle shell 12 from the outside of the grinding disc 8, and the fine particles thrown out of the grinding disc 8 are brought to the upper powder classifier 13 for sorting.

[0025] like Figure 1-4 As shown, a vertical mill feed pre-sorting device of this embodiment includes a drop pipe 4 and a pre-sorting structure 5, that is, in the process of the material falling to the grinding disc 8, it is blown and sorted by hot air in advance, the fine particles are put into the powder separator for sorting in advance, and the coarse particles fall to the grinding disc for sorting.

[0026] The material drop pipe 4 includes a pipe body 4a, which is a barrel-shaped structure with a rectangular cross section, a side wear-resistant plate 4b, a bottom wear-resistant plate 4c, and a bottom vertical plate 4d. In order to prevent material wear, multiple side wear-resistant plates 4b are welded on both sides of the pipe body 4a. In order to reduce the impact of materials falling from the top, multiple groups of bottom wear-resistant plates 4c and bottom vertical plates 4d are set at the bottom. When the materials fall, they accumulate between the two bottom vertical plates 4d to form a deposited material pad. When the materials fall from the top, they hit the material pad and slightly wear the pipe body.

[0027] The pre-sorting structure 5 includes a tube body 5a, an air inlet pipe 5b, a bulk plate 5c, a bottom wear plate 5d, a side wear plate 5e and a gas outlet 5f. When the material moves downward, it passes through the bulk plate 5c, falls and disperses, and is fully blown and selected by the wind entering the vertical mill air inlet pipe 6. The fine powder is brought upward to the gas outlet with the wind, and discharged into the powder selector for sorting. Large particles of material enter the grinding disc along the tube body 2 and are ground by the grinding roller. In order to prevent wear, a bottom wear plate 5d is designed on the bottom edge, and a side wear plate 5e is designed on both sides.

[0028] The air inlet pipe 5b of the pipe body 5a is connected to the air inlet pipe of the vertical mill through the air inlet pipe 3.

[0029] The negative pressure at the mill is greater than the negative pressure of the mill inlet pipe, so a part of the high-temperature air can be introduced into the inlet pipe by relying on the negative pressure inside the mill. A flexible connecting pipe 1 and a flap valve 2 are designed on the induced air pipe 3. The flexible connecting pipe prevents the vibration of the mill from being transmitted to the mill inlet pipe and damages the pipe. The flap valve can adjust the blowing and selection air volume in time according to the amount of fine powder in the material to adapt to the grinding of different materials.

[0030] When this embodiment is working: fine-grained materials enter the discharge pipe 4 through the feeding belt and roll downward. At the bulk plate 5c passing through the pre-sorting discharge pipe 5a, the materials are broken up and separated, and are fully blown and selected by the high-speed wind from the air inlet pipe 6. The wind carries the fine-grained materials out from the gas outlet on the upper part of the bulk plate and enters the powder classifier for sorting. Since the gas outlet is designed at the upper part of the bulk plate 5c, the wind needs to be turned before it can be discharged. The large-grained materials blown by the wind are not easy to turn due to inertia, and will continue to fall, fall to the center of the grinding disc 8, and are dispersed to the bottom of the grinding roller through the rotation of the grinding disc 8, and are ground by the grinding roller. The wind speed of the air inlet pipe can be adjusted in real time by the opening of the flap valve 2 to adapt to the grinding of different materials.

[0031] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above technical features.

Claims

1. A vertical mill feed pre-sorting device, characterized in that: The invention comprises a material discharge pipe (4) and a pre-sorting structure (5), wherein the discharge end of the material discharge pipe (4) is connected to the pre-sorting structure (5); the material discharge pipe (4) comprises a tube body 1 (4a); the pre-sorting structure (5) comprises a tube body 2 (5a), an air inlet pipe (5b), a bulking plate (5c) and a gas outlet (5f); wherein one side of the tube body 2 (5a) is provided with the gas outlet (5f) and the other side is connected to the air inlet pipe (5b); wherein a bulking plate (5c) is provided at the connection between the air inlet pipe (5b) and the tube body 2 (5a); the air inlet pipe (5b) is connected to the vertical mill air inlet pipe (6) through an air induction pipe (3); wherein a flap valve (2) and a flexible connecting pipe (1) are provided on the air induction pipe (3) in sequence; and the gas outlet (5f) is designed at the upper part of the bulking plate (5c).

2. A vertical mill feed pre-sorting device according to claim 1, characterized in that: A plurality of side wear-resistant plates (4b) are respectively provided on both sides of the blanking pipe (4).

3. A vertical mill feed pre-sorting device according to claim 1, characterized in that: The bottom of the drop tube (4) is provided with a plurality of groups of bottom edge wear-resistant plates (4c) and bottom plate vertical plates (4d).

4. A vertical mill feed pre-sorting device according to claim 1, characterized in that: The bottom of the second pipe body (5a) is provided with a second bottom wear-resistant plate (5d) and two side wear-resistant plates (5e) are provided on both sides.

5. The vertical mill feed pre-sorting device according to claim 1, characterized in that: The tube body 1 (4a) is a barrel-shaped structure with a rectangular cross-section.

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