Return material sampling device of vertical mill powder concentrator

Abstract

The utility model provides a returned material sampling device for a powder concentrator of a vertical mill, which is arranged at an opening on the side wall of a blanking cone, and comprises a sampling pipe comprising a gland, a discharge pipe and a threaded discharge port, wherein the gland is of a circular ring structure; wherein one end of the gland is welded to one end of the discharging pipe, the discharging pipe penetrates through the protective sleeve, and a threaded discharging opening is welded to the bottom of the discharging pipe; a plug is screwed on the outer surface of the threaded discharge hole through threads; wherein the protective sleeve comprises a protective cover and a protective tube; the protecting cover is of a circular ring structure; the protecting cover is welded to the discharging port end of the discharging cone. A semicircular hole is formed in the discharging pipe from the bottom of the gland and used for collecting returned materials. The powder concentrator return material sampling device can be used for sampling powder concentrator return materials at any time, and sampling is convenient and fast.

Description

Technical Field

[0001] The utility model belongs to the field of powder classifier performance test sampling, in particular to a material return sampling device for a vertical mill powder classifier. 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 powder classifier on the upper part of the vertical mill will sort the materials blown up by the grinding disc in time according to the quality requirements. The qualified materials are taken out from the powder classifier outlet and collected by the dust collector. The unqualified materials fall back to the grinding disc from the discharge cone at the bottom of the powder classifier rotor and are ground again. The efficiency of the powder classifier directly affects the output and power consumption of the vertical mill. Its performance test has always been an important research content for designers. The powder classifier efficiency test requires sampling and screening of the powder classifier return material. Because the powder classifier return material is in the powder classifier discharge cone when the vertical mill is running, it is not easy to take it out. Now some companies use steel pipes welded to the discharge cone, and the return material flows out of the mill from the steel pipe and is then collected. In this method, before each sampling, all the materials in the steel pipe need to be discharged before the instantaneous sample can be taken. At the same time, due to the large negative pressure inside the mill, when the material is discharged, the pipe will suck air into the mill. This part of the wind will blow the return fine powder that falls into the pipe back into the discharge cone of the powder classifier, affecting the representativeness of the sampling and the test results. Summary of the invention

[0003] In order to solve the above problems, the present invention discloses a sampling device for return material of a vertical mill powder selector. The matching design of the sampling tube and the protective cover can sample the return material of the powder selector at any time, and the sampling is convenient and rapid.

[0004] A return material sampling device for a vertical mill powder concentrator, wherein the return material sampling device is arranged at an opening on the side wall of a discharge cone, wherein the return material sampling device comprises a sampling tube comprising a pressure cover, a discharge pipe, and a threaded discharge port; wherein the pressure cover is a circular ring structure; wherein one end of the pressure cover is welded to one end of the discharge pipe, wherein the discharge pipe passes through a protective sleeve and a threaded discharge port is welded at the bottom; wherein the outer surface of the threaded discharge port is plugged by screwing a plug through a thread; wherein the protective sleeve comprises a protective cover and a protective tube; the protective cover is a circular ring structure; the protective cover is welded to the discharge port end of the discharge cone; the discharge pipe is provided with a semicircular hole starting from the bottom of the pressure cover for collecting return materials.

[0005] Furthermore, a fixing plate 2 is welded to the lower end of the protective tube, and a fixing plate 1 is provided below the fixing plate 2; wherein the fixing plate 1 is welded and fixed to the discharge pipe; wherein the fixing plate 1 and the fixing plate 2 are connected by studs and locked by nuts.

[0006] Furthermore, the fixing plate 1 and the fixing plate 2 are both provided with a plurality of connection holes.

[0007] Furthermore, the outer ring of the pressure cover is provided with an annular protrusion structure; the outer ring of the protective cover is provided with an annular groove structure; wherein the annular protrusion structure and the annular groove structure are adapted to each other.

[0008] The working principle of the utility model is:

[0009] The sampling tube is inserted in the middle of the protective sleeve, and then the fixed plate 1 is welded after the sampling tube is inserted into the protective sleeve; a plug is screwed on the threaded discharge port to fix it. One end of the protective cover is welded to the discharge cone, and the other end is welded to the mill shell; when no sampling is done, the raised structure on the gland of the sampling tube and the groove structure on the protective cover cooperate with each other, and the other side uses studs and nuts to fix the fixed plate 1 and the fixed plate 2 to each other; at this time, the powder selector does not return to the sampling tube.

[0010] When sampling is required, remove the studs and nuts, then push the sampling tube upwards, and fix the first and second fixing plates tightly together to seal the lower part. At the same time, the plug keeps the inside of the sampling tube sealed; the return material flows into the sampling tube from the upper semicircular opening; after sampling is completed, move the sampling tube downward, and the gland presses against the protective cover to seal it. After the plug is unscrewed, the material is discharged from the sampling tube and collected in the sampling container for screening; then it is fixed with studs and nuts, waiting for the next sampling.

[0011] Beneficial effects of the utility model:

[0012] 1. The present invention can sample the return material of the powder selector at any time through the coordinated design of the sampling tube and the protective cover, and the sampling is convenient and rapid.

[0013] 2. The present invention adopts the combined design of sampling tube, sheath and plug, so that the sampling tube and the sheath, and the inside of the sampling tube are kept in a sealed state during sampling, which is not affected by the large negative pressure in the mill, and the return and discharge of materials are not disturbed. The sampling is highly representative and the test results are accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the front view of the utility model when no sampling is performed;

[0015] Figure 2 It is the main view of the utility model when sampling;

[0016] Figure 3 This utility model is detailed Figure I ;

[0017] Figure 4 This utility model is detailed Figure II ;

[0018] Figure 5 This utility model is detailed Figure III ;

[0019] Figure 6 This is the front view of the sampling tube of the utility model;

[0020] Figure 7 This is the front view of the protective cover of the utility model;

[0021] List of reference numerals:

[0022] Among them, 1-sampling tube; 2-protective cover; 3-plug; 4-stud; 5-nut; 6-rotor; 7-wind guide blade; 8-unloading cone; 1a-pressure cover; 1b-discharging pipe; 1c-fixing plate 1; 1d-threaded discharge port; 2a-protective cover, 2b-protective tube, 2c-fixing plate 2. 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] In this embodiment, a hole is drilled at a suitable position on the discharge cone of the powder selector, and the sampling device is welded to the discharge cone of the powder selector and the mill housing. Figure 1 and 2 As shown, the rotor 6, the air guide blades 7, and the discharge cone 8 are schematic diagrams of the conventional structure of the powder classifier.

[0025] like Figure 1-7 As shown, the utility model is composed of a sampling tube 1, a protective sleeve 2, a plug 3, a stud 4, and a nut 5. Figure 6 As shown, the sampling tube 1 includes a gland 1a, a discharge pipe 1b, a fixing plate 1c, and a threaded discharge port 1d. The gland 1a is a circular ring structure with an annular protrusion structure on the outer ring. It is welded to one end of the discharge pipe 1b. A semicircular hole is opened on the discharge pipe 1b starting from the bottom of the gland to collect the return material. A threaded discharge port is welded at the other end of the discharge pipe 1b, and a threaded connection is arranged on the outside. A fixing plate 1c is welded on the discharge pipe above the threaded discharge port, and a plurality of connection holes are arranged on the fixing plate 1c.

[0026] like Figure 7 As shown, the protective sleeve includes a protective cover 2a, a protective tube 2b, and a fixing plate 2c. The protective cover is a circular ring structure, and the outer ring has an annular groove structure. The protective cover 2a and the protective tube 2b are welded, and the protective cover 2a is welded to the unloading cone 8. The other end of the protective tube 2b is welded with a fixing plate 2c, and the fixing plate 2c has a plurality of connection holes.

[0027] like Figure 1 and2 As shown, the sampling tube is inserted in the middle of the protective sleeve, and the fixing plate 1 is welded and fixed after the sampling tube is inserted into the protective sleeve. The plug 3 is screwed on the threaded discharge port 1d to fix it. One end of the protective cover 2a is welded to the discharge cone 8, and the other end is welded to the mill housing.

[0028] When sampling is not required, the sampling tube 1 and the protective cover 2 are fixed by the stud 4 and the nut 5. At this time, the convex structure on the gland of the sampling tube and the groove structure on the protective cover cooperate with each other to keep the sampling device sealed and prevent leakage. When sampling is required, the stud 4 and the nut 5 are removed, the sampling tube 1 is lifted upward, and the fixing plate 1c and the fixing plate 2c2 are tightly attached to play a role in sealing the lower part, so that there is no air intake interference in the gap between the sampling tube 1 and the protective cover 2. Due to the effect of the plug 3, the return material flows from the upper semicircular opening into the sampling tube 1. When the return material flows in, there is no gas disturbance in the sampling tube 1, and the sampling representativeness is strong. After the sampling is completed, the sampling tube is moved downward, and the gland 1a supports the protective cover 2a. After the plug 3 is unscrewed, the material is discharged from the sampling tube 1 and received in the sampling container for screening. Then fix it with the stud 4 and the nut 5 and wait for the next sampling.

[0029] 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 powder concentrator return material sampling device, characterized in that : The return material sampling device is arranged at the side wall opening of the discharge cone (8), wherein the return material sampling device includes a sampling tube including a pressure cover (1a), a discharge pipe (1b), and a threaded discharge port (1d); wherein the pressure cover (1a) is a circular ring structure; wherein one end of the pressure cover (1a) is welded to one end of the discharge pipe (1b), wherein the discharge pipe (1b) passes through a protective sleeve (2) and a threaded discharge port (1d) is welded at the bottom; wherein the outer surface of the threaded discharge port (1d) is threadedly tightened with a plug (3); wherein the protective sleeve includes a protective cover (2a) and a protective pipe (2b); wherein the protective cover (2a) is a circular ring structure; wherein the protective cover (2a) is welded to the discharge port end of the discharge cone (8); and the discharge pipe (1b) is provided with a semicircular hole starting from the bottom position of the pressure cover (1a) for collecting return materials.

2. A vertical mill powder concentrator return material sampling device according to claim 1, characterized in that A fixing plate 2 (2c) is welded to the lower end of the protective tube (2b), and a fixing plate 1 (1c) is provided below the fixing plate 2 (2c); wherein the fixing plate 1 (1c) is welded and fixed to the discharge pipe (1b); wherein the fixing plate 1 (1c) and the fixing plate 2 (2c) are connected by studs (4) and are locked by nuts (5).

3. A vertical mill powder concentrator return material sampling device according to claim 2, characterized in that : The fixing plate 1 (1c) and the fixing plate 2 (2c) are both provided with a plurality of connection holes.

4. A vertical mill powder concentrator return material sampling device according to claim 1, characterized in that : The outer ring of the pressure cover (1a) is provided with an annular protrusion structure; the outer ring of the protective cover (2a) is provided with an annular groove structure; the annular protrusion structure and the annular groove structure are adapted to each other.

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