Rotary kiln tail material screw-in structure

Abstract

Compared with the prior art, the rotary kiln tail material screw-in structure has the advantages that when the rotary kiln rotates, the speed of pushing kiln tail materials to the middle area of the rotary kiln can be increased, so that accumulation of the kiln tail materials is reduced, and the material overflowing probability is reduced; comprising a plurality of screw-in blades arranged on the inner side wall of a kiln tail, each screw-in blade comprises a first end far away from a kiln head and a second end close to the kiln head, the screw-in direction from the first end to the second end is opposite to the rotation direction of the rotary kiln, and the screw-in blades are evenly arranged around the axis of the rotary kiln at intervals.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary kilns, in particular to a rotary kiln tail material rotation structure. Background Art

[0002] In the preparation process of alumina, it needs to go through the processes of crushing, wet grinding, separation and washing. After separation and washing, aluminum hydroxide can be prepared. Aluminum hydroxide is calcined in a rotary kiln to produce alumina.

[0003] During operation, aluminum hydroxide is added into the rotary kiln from the kiln tail. The kiln head of the rotary kiln is lower than the kiln tail. During the rotation of the rotary kiln, the material can move from the kiln tail to the kiln head with a lower height. However, when the aluminum hydroxide is added too quickly, the material cannot move in time and causes the material to accumulate at the kiln tail. At this time, the material is easy to overflow from the kiln tail mouth. Utility Model Content

[0004] The utility model aims to solve the above problems and provide a rotary kiln tail material rotation structure which can accelerate the speed of pushing the kiln tail material to the middle area of the rotary kiln when the rotary kiln rotates, thereby reducing the accumulation of kiln tail material and reducing the probability of overflow.

[0005] To achieve the above-mentioned purpose, the technical solution of the utility model is: a rotary kiln tail material rotation structure, comprising: a plurality of rotation blades arranged on the inner wall of the kiln tail, the rotation blades comprising a first end arranged away from the kiln head and a second end arranged close to the kiln head, the rotation direction from the first end to the second end is opposite to the rotation direction of the rotary kiln, and the plurality of rotation blades are evenly spaced around the axis of the rotary kiln.

[0006] Furthermore, the spiral blades are detachably fixedly connected to the rotary kiln.

[0007] Furthermore, both ends of the spiral blade are detachably connected with a fixing plate, and the fixing plate is pre-embedded on the inner wall of the rotary kiln.

[0008] Furthermore, the spiraling blade comprises a pushing surface, and the fixing plate is arranged on a side of the spiraling blade opposite to the pushing surface.

[0009] Furthermore, the end of each fixing plate is plugged with a plug sleeve, and the plug sleeve is detachably fixedly connected to the screw-in blade.

[0010] Furthermore, the plug-in sleeve includes an inner sleeve body, an outer sleeve body and a heat-insulating support layer arranged between the inner sleeve body and the outer sleeve body. One of the outer sleeve body and the screw-in blade is provided with a plurality of first nuts, and the other is provided with a plurality of first fixing screws corresponding to the plurality of first nuts one by one.

[0011] Furthermore, the heat-insulating support layer is made of fiberglass.

[0012] A material swirling-in structure at the tail of a rotary kiln disclosed by the present utility model has the following beneficial effects compared with the prior art: it can accelerate the pushing speed of the tail materials of the rotary kiln towards the middle area of the rotary kiln when the rotary kiln rotates, thereby reducing the accumulation of the tail materials of the rotary kiln and reducing the probability of overflow. It includes: a plurality of swirling-in vanes arranged on the inner side wall of the kiln tail, the swirling-in vanes include a first end arranged far from the kiln head and a second end arranged close to the kiln head, the swirling-in direction from the first end to the second end is opposite to the self-rotation direction of the rotary kiln, and the plurality of swirling-in vanes are evenly spaced around the axis of the rotary kiln. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural diagram of a material swirling-in structure at the tail of a rotary kiln of the present utility model.

[0014] Figure 2 It is a schematic structure of a material swirling-in structure at the tail of a rotary kiln of the present utility model Figure 2 .

[0015] Figure 3 It is a schematic structure of a material swirling-in structure at the tail of a rotary kiln of the present utility model Figure 3 .

[0016] Figure 4 It is a schematic structural diagram of a swirling-in vane in a material swirling-in structure at the tail of a rotary kiln of the present utility model.

[0017] Figure 5 It is a schematic structural diagram of a socket sleeve in a material swirling-in structure at the tail of a rotary kiln of the present utility model.

[0018] Figure 6 It is a schematic structural diagram of a fixing plate in a material swirling-in structure at the tail of a rotary kiln of the present utility model.

[0019] Figure 7 It is a schematic connection structure diagram of a fixing plate and a socket sleeve in the present utility model.

[0020] Figure 8 It is a schematic structural diagram of a swirling-in vane in the present utility model.

[0021] In the figure: 1, rotary kiln; 10, kiln tail; 2, swirling-in vane; 21, first end; 22, second end; 23, material pushing surface; 24, installation through hole; 25, second installation through hole; 3, fixing plate; 31, embedded end; 32, insertion end; 320, insertion hole; 33, sealing sleeve; 4, socket sleeve; 41, inner sleeve body; 410, first hole; 42, outer sleeve body; 420, second hole; 43, heat-insulating support layer; 44, first nut; 45, support sleeve; 46, second nut; 5, material guiding groove. DETAILED DESCRIPTION

[0022] The utility model is now described in further detail in conjunction with the accompanying drawings. The accompanying drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0023] Please refer to Figures 1-7 The technical solution of the utility model is: a rotary kiln tail material swirling structure, comprising: a plurality of swirling blades 2 arranged on the inner side wall of the kiln tail, the swirling blades 2 comprising a first end 21 arranged away from the kiln head and a second end 22 arranged close to the kiln head, the swirling direction from the first end 21 to the second end 22 is opposite to the rotation direction of the rotary kiln, and the plurality of swirling blades 2 are evenly spaced around the axis of the rotary kiln.

[0024] Specifically, during operation, aluminum hydroxide is introduced into the kiln tail 10 of the rotary kiln 1 through the guide trough 5. The height of the kiln tail of the rotary kiln is higher than that of the kiln tail. Figure 2 The rotary kiln rotates in the direction indicated by the middle arrow. During the rotation, the material slowly moves from the kiln tail to the kiln head and is calcined into alumina through the rotary kiln. The present application sets a spiral blade 2, which can push the aluminum hydroxide at the kiln tail toward the kiln head when the rotary kiln rotates. The spiral blade can accelerate the movement speed of the aluminum hydroxide at the kiln tail, thereby reducing the accumulation of aluminum hydroxide and reducing the risk of aluminum hydroxide overflowing from the kiln tail.

[0025] Furthermore, the spiral blade 2 is detachably fixedly connected to the rotary kiln.

[0026] Specifically, it is understandable that the spiraling blades will wear during use, and a large amount of wear will reduce the pushing efficiency of the spiraling blades. As a preferred embodiment, the spiraling blades 2 are detachably fixedly connected to the side wall of the rotary kiln, so that the spiraling blades 2 can be replaced when they are worn, thereby ensuring the spiraling efficiency of the spiraling blades.

[0027] Furthermore, both ends of the spiral blade 2 are detachably connected with a fixing plate 3, and the fixing plate 3 is pre-embedded on the inner wall of the rotary kiln.

[0028] As a specific implementation, when constructing the rotary kiln, a fixing plate 3 is pre-embedded on the side wall of the rotary kiln, and the blades 2 are detachably fixedly connected to the fixing plate 3 by screwing in.

[0029] Further, as a preferred embodiment, the precessing blade 2 includes a pushing surface 23 , and the fixing plate 3 is arranged on a side of the precessing blade 2 opposite to the pushing surface 23 .

[0030] Specifically, the material pushing surface 23 is the surface where the spiral blades 2 push the material when the rotary kiln rotates. That is to say, the surface of the spiral blades in contact with and rubbing against the material is the material pushing surface 23. By arranging the fixing plate 3 on the side opposite to the material pushing surface of the spiral blades 2, the probability of mutual friction between the fixing plate and the material can be reduced, thereby reducing the wear amount of the material and increasing the service life of the fixing plate 3.

[0031] Further, as a specific implementation manner, referring to Figures 4-7 , a socket sleeve 4 is inserted and fitted at each end of the fixing plate 3, and the socket sleeve 4 is detachably and fixedly connected to the spiral blade 2.

[0032] Specifically, socket sleeves 4 can be detachably and fixedly connected to both ends of the spiral blades. The socket sleeves 4 are inserted and fitted with the fixing plate 3. With this setting method, when installing the spiral blades 2, the socket sleeves 4 can be first sleeved on the fixing plate 3, and then the spiral blades 2 are fixedly connected to the socket sleeves 4, thus facilitating the installation of the spiral blades. The socket sleeves 4 sleeved around the fixing plate 3 can protect the fixing plate 3, further increasing the service life of the fixing plate 3. Moreover, the socket sleeves are detachably and fixedly connected to both the fixing plate 3 and the spiral blades, and the socket sleeves 4 can be replaced when worn, ensuring the protective effect of the socket sleeves on the fixing plate 3.

[0033] Further, as a specific implementation manner, referring to Figure 6 、 Figure 7 , the fixing plate 3 includes a pre-embedded end 31 embedded in the wall of the rotary kiln and a socket end 32 for inserting and fitting with the socket sleeve. The fixing plate can be made of corrosion-resistant and high-temperature-resistant steel, such as nickel-iron-chromium alloy, 310s stainless steel, 800N8800 alloy, etc.

[0034] Further, as a specific implementation manner, referring to Figure 5 、 Figure 7 , the specific structure of the socket sleeve is that the socket sleeve 4 includes an inner sleeve body 41, an outer sleeve body 42, and a heat-insulating support layer 43 arranged between the inner sleeve body 41 and the outer sleeve body 42. One of the outer sleeve body 42 and the spiral blade 2 is provided with a plurality of first nuts 44, and the other is provided with a plurality of first fixing screws corresponding to the plurality of first nuts 44 one by one.

[0035] As a specific implementation manner, the inner sleeve body and the outer sleeve body of the socket sleeve 4 are both made of steel. Four holes are provided on one surface of the outer sleeve body, and four first nuts 44 corresponding to the four holes are provided on the inner surface of the outer sleeve body. Referring to Figure 8, four second mounting through holes 25 corresponding to the four first nuts 44 one by one are provided at both ends of the precession blade 2. When installing the plug sleeve, the four first nuts 44 of the plug sleeve are made to correspond to the four mounting through holes one by one, and then a screw rod with an end cap is passed through the mounting through hole and threadedly connected to the first nut. Then, the screw rod is tightened, and the end cap presses and locks the feeding surface of the precession blade, thereby achieving the purpose of locking the plug sleeve on the precession blade 2.

[0036] Further, referring to Figure 7 , Figure 8 , a plug hole 320 is provided through the fixing plate, a first hole 410 adapted to the plug hole is provided on the inner sleeve body, and a second hole 420 adapted to the plug hole is provided on the side wall of the outer sleeve body. Referring to Figure 8 , second mounting through holes 25 adapted to the second hole, the first hole are provided at both ends of the precession blade. A second nut is provided on the side wall of the inner sleeve body close to the first nut. Specifically, the lower end of the second nut is welded to the side wall of the outer sleeve body 42, and the upper end of the second nut is slidably fitted with the outer side wall of the inner sleeve body. A support sleeve 45 is provided on the other side wall of the inner sleeve body. The heat-insulating support sleeve is made of high-temperature-resistant materials such as corundum, and of course, it can also be made of steel. The support sleeve 45 can be fixed to the outer side wall of the inner sleeve body 41 by bonding, and the upper end of the support sleeve is slidably fitted with the outer sleeve body.

[0037] When installing the plug sleeve onto the fixing plate, first put the plug sleeve on the fixing plate 3 so that the plug hole corresponds to the first hole and the second hole. Then, take a screw rod with an end cap and pass it in from the second hole 420 on the side far from the first nut, and then sequentially pass through the support sleeve and the plug hole, and threadedly connect it to the second nut 46. After tightening, the plug sleeve and the fixing plate are limited by the screw rod.

[0038] Further, as a specific implementation manner, the material of the heat-insulating support layer 43 is glass fiber.

[0039] Obviously, the above embodiments are only examples clearly described and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A swirling-in structure of materials at the tail of a rotary kiln, characterized in that, include: A plurality of spiral blades (2) are arranged on the inner side wall of the kiln tail, the spiral blades (2) comprising a first end (21) arranged away from the kiln head and a second end (22) arranged close to the kiln head, the spiral direction from the first end (21) to the second end (22) being opposite to the rotation direction of the rotary kiln, and the plurality of spiral blades (2) are evenly spaced around the axis of the rotary kiln.

2. The swirling-in structure of the material at the tail of the rotary kiln according to claim 1, characterized in that, The spiraling blade (2) is detachably fixedly connected to the rotary kiln.

3. The swirling-in structure of the material at the tail of a rotary kiln according to claim 2, wherein Both ends of the rotating blade (2) are detachably connected to a fixing plate (3), and the fixing plate (3) is pre-buried on the inner wall of the rotary kiln.

4. A swirling-in structure of the material at the tail of a rotary kiln according to claim 3, characterized in that, The screw-in blade (2) comprises a pushing surface (23), and the fixing plate (3) is arranged on a side of the screw-in blade (2) opposite to the pushing surface (23).

5. The swirling-in structure of the material at the tail of the rotary kiln according to claim 4, characterized in that, The end of each fixing plate (3) is plugged with a plug sleeve (4), and the plug sleeve (4) is detachably fixedly connected to the screw-in blade (2).

6. The swirling-in structure of the material at the tail of the rotary kiln according to claim 5, characterized in that, The plug-in sleeve (4) comprises an inner sleeve body (41), an outer sleeve body (42), and a heat-insulating support layer (43) arranged between the inner sleeve body (41) and the outer sleeve body (42); one of the outer sleeve body (42) and the screw-in blade (2) is provided with a plurality of first nuts (44), and the other is provided with a plurality of first fixing screws corresponding one-to-one to the plurality of first nuts (44).

7. The swirler structure of the material at the tail of the rotary kiln according to claim 6, characterized in that, The material of the heat insulation support layer (43) is glass fiber.

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