Kiln tail powder coarse and fine screening device of rotary kiln

Abstract

A kiln tail powder coarse and fine screening device of a rotary kiln comprises a fixing plate, an inner cylinder is rotationally installed on the fixing plate, an outer cylinder is sleeved on the periphery of the inner cylinder, the outer cylinder is fixedly installed on the fixing plate, a plurality of supporting seats are fixedly installed on the bottom side of the outer cylinder, the heights of the supporting seats are sequentially reduced from left to right, and a feeding pipe is arranged on the fixing plate in a communicating mode. The device is simple in structure and ingenious in conception, materials can be conveyed without a negative pressure pump, the first spiral blade and the second spiral blade can rotate to convey the materials to the first discharging port and the second discharging port, and when the first spiral blade rotates, large and small particles mixed together can be turned over through friction force, so that the small particles penetrate through the sieve holes, and the material conveying efficiency is improved. And when the powder is screened, the first spiral blade and the second spiral blade rotate to scrape powder adhered to the inner wall and the outer wall of the inner barrel and the inner wall of the outer barrel, the market requirement is met, and the powder screening device is suitable for being popularized.

Description

Technical Field

[0001] The utility model belongs to the field of smelting, in particular to a device for screening powder coarseness and fineness at the tail of a rotary kiln. Background Art

[0002] The rotary kiln is also called the rotary bed kiln, which belongs to the category of building materials equipment. The rotary kiln can be divided into cement kiln, metallurgical chemical kiln and lime kiln according to the different materials processed. When the rotary kiln is in operation, the kiln tail mainly preheats and pre-decomposes the raw material powder to decompose the raw material powder into the required raw materials, but the decomposition rate entering the kiln is generally around 92%, so that after the operation is completed, there is a mixture of large and small particles left at the kiln tail, which needs to be separated, but conventional screening devices are prone to adhere to powder, resulting in a decrease in the final output. The State Intellectual Property Office authorized the public on March 28, 2023 We reported a patent with authorization announcement number CN218743047U: "A coarse and fine screening device for powder at the tail of a rotary kiln". The patent discloses a device for coarse and fine screening of powder at the tail of a rotary kiln, but the device needs to use a negative pressure pump to transport powder. During screening, small particles are mixed with large particles and transported together by the negative pressure pump. The small particles are light in weight and are more easily sucked away by the negative pressure pump, so that large and small particles flow out from the outlet before being screened apart, resulting in insufficient screening of powder at the tail of the kiln. Therefore, we designed a coarse and fine screening device for powder at the tail of a rotary kiln. Utility Model Content

[0003] The utility model provides a kiln tail powder coarse and fine screening device of a rotary kiln, which is used to solve the defects in the prior art.

[0004] The utility model is realized through the following technical solutions:

[0005] A device for screening powder at the tail of a rotary kiln, comprising a fixed plate, an inner cylinder is rotatably mounted on the fixed plate, an outer cylinder is sleeved on the outer circumference of the inner cylinder, the outer cylinder is fixedly mounted on the fixed plate, a plurality of support seats are fixedly mounted on the bottom side of the outer cylinder, the height of the support seats decreases from left to right, a feed pipe is connected to the fixed plate, the feed pipe is connected to the cavity of the inner cylinder, a plurality of sieve holes are provided on the inner cylinder, a first discharge port and a second discharge port are provided on the outer cylinder, characterized in that: a rotating shaft is rotatably mounted on the fixed plate, a first spiral blade is fixedly provided on the outer circumference of the rotating shaft, the outer circumference of the first spiral blade is in sliding contact with the inner wall of the inner cylinder, a second spiral blade is provided in sliding contact with the outer circumference of the inner cylinder, the outer circumference of the second spiral blade is in sliding contact with the inner circumference of the outer cylinder, a driving mechanism for driving the first spiral blade and the second spiral blade to rotate synchronously and in the opposite direction to the rotation of the inner cylinder is provided on the fixed plate, and the second spiral blade is connected to the first spiral blade through the driving mechanism.

[0006] As described above, a rotary kiln tail powder coarse and fine screening device, the driving mechanism includes a motor, the motor is fixedly mounted on a fixed plate, a first gear is fixedly mounted on the outer periphery of the rotating shaft, a second gear is meshingly provided on one side of the first gear, the second gear is fixedly connected to the output shaft of the motor, a first gear ring is fixedly mounted on the inner wall of the inner cylinder, the first gear ring is meshingly provided with the second gear, the second gear ring is fixedly mounted on the outer wall of the inner cylinder, a third gear is meshingly provided on one side of the second gear ring, the third gear is rotatably mounted on the fixed plate, a third gear ring is meshingly provided on one side of the third gear, the third gear ring is fixedly mounted on the annular plate, the inner periphery and outer periphery of the annular plate are rotatably mounted on the inner cylinder and the outer cylinder in turn, and the second spiral blade is fixedly mounted on the annular plate through a plurality of connecting rods.

[0007] In the above-mentioned device for coarse and fine screening of powder at the tail of a rotary kiln, one end of the feed pipe extending into the inner cylinder passes through the first gear ring.

[0008] In the above-mentioned rotary kiln tail powder coarse and fine screening device, a baffle is provided in the inner cylinder, and the feed pipe is fixedly installed in the through hole opened on the baffle, and the baffle is rotatably connected to the outer periphery of the rotating shaft and the inner wall of the inner cylinder respectively.

[0009] In the above-mentioned device for screening powder coarse and fine particles at the tail end of a rotary kiln, the first discharge port and the second discharge port are both discharge ports that are narrow on the inside and wide on the outside.

[0010] The advantages of the utility model are: the utility model has a simple structure and an ingenious design. It does not need to rely on a negative pressure pump to transport materials. The rotation of the first spiral blade and the second spiral blade can transport materials to the first discharge port and the second discharge port. When the first spiral blade rotates, the friction force can be used to flip the large and small particles mixed together, so that small particles pass through the sieve holes and large particles continue to be transported forward, so that the large and small particles are screened more fully. While screening the powder, the rotation of the first spiral blade and the second spiral blade can also scrape off the powder adhered to the inner and outer walls of the inner cylinder and the inner wall of the outer cylinder, which meets market demand and is suitable for promotion. When the utility model is used, since the rotary kiln is arranged at an angle, the device is also arranged at an angle for better connectivity. First, the kiln tail powder is transported into the inner cylinder through the feed pipe, and the first spiral blade and the second spiral blade are controlled by the driving mechanism to rotate synchronously in the forward direction, and the inner cylinder rotates in the reverse direction. During the rightward transport of the powder, small particles can enter the outer cylinder from the sieve holes and are finally discharged through the first discharge port, while large particles continue to move rightward in the inner cylinder and are finally discharged through the second discharge port. The first spiral blade can increase the travel of the kiln tail powder in the inner cylinder, so that the large and small particles therein are screened more fully. The rotation of the first spiral blade and the second spiral blade can also scrape off the powder adhered to the inner and outer walls of the inner cylinder and the inner wall of the outer cylinder, thereby reducing the occurrence of a decrease in final output. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0012] Figure 1 It is a structural schematic diagram of the utility model.

[0013] Figure numerals: 1. fixed plate, 2. inner cylinder, 3. outer cylinder, 4. support seat, 5. feed pipe, 6. sieve hole, 7. first discharge port, 8. second discharge port, 9. rotating shaft, 10. first spiral blade, 11. second spiral blade, 20. motor, 21. first gear, 22. second gear, 23. first gear ring, 24. second gear ring, 25. third gear, 26. third gear ring, 27. annular plate, 40. baffle. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0015] A rotary kiln tail powder coarse and fine screening device, such as Figure 1As shown, it includes a fixed plate 1, an inner cylinder 2 is rotatably mounted on the fixed plate 1, both ends of the inner cylinder 2 are open, an outer cylinder 3 is sleeved on the outer periphery of the inner cylinder 2, one end of the inner cylinder 2 is rotatably mounted on the fixed plate 1 through a bearing, the other end of the inner cylinder 2 is rotatably mounted on the outer cylinder 3 through a bearing, the outer cylinder 3 is fixedly mounted on the fixed plate 1, one end of the outer cylinder 3 is open, and the open end of the outer cylinder 3 is fixedly mounted on the fixed plate 1, a plurality of support seats 4 are fixedly mounted on the bottom side of the outer cylinder 3, and the height of the support seats 4 decreases from left to right, a feed pipe 5 is connected to the fixed plate 1, and the feed pipe 5 is connected to the cavity of the inner cylinder 2, a plurality of sieve holes 6 are provided on the inner cylinder 2, and a first discharge port 7 and a second discharge port 7 are provided on the outer cylinder 3 Port 8, characterized in that: a rotating shaft 9 is rotatably installed on the fixed plate 1, and a first spiral blade 10 is fixedly arranged on the outer periphery of the rotating shaft 9, and the outer periphery of the first spiral blade 10 is in sliding contact with the inner wall of the inner cylinder 2, and a second spiral blade 11 is provided in sliding contact with the outer periphery of the inner cylinder 2, and the outer periphery of the second spiral blade 11 is in sliding contact with the inner periphery of the outer cylinder 3, and the inner cylinder 2, the outer cylinder 3, the rotating shaft 9, the first spiral blade 10 and the second spiral blade 11 are coaxially arranged, and a driving mechanism for driving the first spiral blade 10 and the second spiral blade 11 to rotate synchronously and in the opposite direction to the rotation of the inner cylinder 2 is provided on the fixed plate 1, and the second spiral blade 11 is connected to the first spiral blade 10 through the driving mechanism. The utility model has a simple structure and an ingenious design. It does not need to rely on a negative pressure pump to transport materials. The first spiral blade 10 and the second spiral blade 11 can rotate to transport materials to the first discharge port 7 and the second discharge port 8. When the first spiral blade 10 rotates, the friction force can be used to turn over the large and small particles mixed together, so that the small particles pass through the sieve holes 6, and the large particles continue to be transported forward, so that the large and small particles are screened more fully. While screening the powder, the first spiral blade 10 and the second spiral blade 11 can also rotate to scrape off the powder adhered to the inner and outer walls of the inner cylinder 2 and the inner wall of the outer cylinder 3, thereby meeting market demand and being suitable for promotion. When using the utility model, since the rotary kiln is arranged at an angle, the device is also arranged at an angle for better connectivity. First, the kiln tail powder is transported into the inner cylinder 2 through the feed pipe 5, and the first spiral blade 10 and the second spiral blade 11 are controlled by the driving mechanism to rotate synchronously in the forward direction, and the inner cylinder 2 rotates in the reverse direction. During the powder transportation to the right, small particles can enter the outer cylinder 3 from the sieve hole 6, and finally be discharged through the first discharge port 7, and large particles continue to move to the right in the inner cylinder 2, and finally be discharged through the second discharge port 8. The first spiral blade 10 can increase the travel of the kiln tail powder in the inner cylinder 2, so that the large and small particles therein can be screened more fully. The rotation of the first spiral blade 10 and the second spiral blade 11 can also scrape off the powder adhered to the inner and outer walls of the inner cylinder 2 and the inner wall of the outer cylinder 3, thereby reducing the occurrence of a decrease in the final output.

[0016] Specifically, as shown in the figure, the driving mechanism described in this embodiment includes a motor 20, which is fixedly mounted on the fixed plate 1, and a first gear 21 is fixedly mounted on the outer periphery of the rotating shaft 9, and a second gear 22 is meshed and matched on one side of the first gear 21, and the second gear 22 is fixedly connected to the output shaft of the motor 20, and the second gear 22 is rotatably mounted in a reserved hole opened on the fixed plate 1 through the rotating shaft, and is fixedly connected to the output shaft of the motor 20, and a first gear ring 23 is fixedly mounted on the inner wall of the inner cylinder 2, and the first gear ring 23 meshes and matches with the second gear 22, and a second gear ring 24 is fixedly mounted on the outer wall of the inner cylinder 2, and a third gear 25 is meshed and matched on one side of the second gear ring 24, and the third gear 25 is rotatably mounted on the fixed plate 1, and a third gear ring 26 is meshed and matched on one side of the third gear 25, and the third gear ring 26 is fixedly mounted on the annular plate 27, and the inner periphery and outer periphery of the annular plate 27 are rotatably mounted on the inner cylinder 2 and the outer cylinder 3 in turn, and the second spiral blade 11 is fixedly mounted on the annular plate 27 through a number of connecting rods. The output shaft of the motor 20 drives the second gear 22 to rotate in the opposite direction, the second gear 22 drives the rotating shaft 9, the first spiral blade 10 and the first gear 21 to rotate forward, the second gear 22 drives the first gear ring 23, the inner cylinder 2 and the second gear ring 24 to rotate in the opposite direction, the second gear ring 24 drives the third gear 25 to rotate forward, the third gear 25 drives the third gear ring 26, the annular plate 27 and the second spiral blade 11 to rotate forward, so that the first spiral blade 10 and the second spiral blade 11 rotate forward synchronously, and the inner cylinder 2 rotates in the opposite direction.

[0017] Specifically, as shown in the figure, one end of the feed pipe 5 in this embodiment extends into the inner cylinder 2 and passes through the first gear ring 23. One end of the feed pipe 5 is located on the right side of the first gear ring 23 to prevent the outflowing material from entering the tooth groove of the first gear ring 23, thereby affecting the rotation of the first gear ring 23.

[0018] Further, as shown in the figure, a baffle 40 is provided in the inner cylinder 2 of the present embodiment, and the feed pipe 5 is fixedly installed in a through hole opened in the baffle 40, and the baffle 40 is rotatably connected to the outer periphery of the rotating shaft 9 and the inner wall of the inner cylinder 2. The baffle 40 can prevent dust generated during screening from affecting the operation of the driving mechanism.

[0019] Furthermore, as shown in the figure, the first discharge port 7 and the second discharge port 8 of this embodiment are both discharge ports with narrow inner side and wide outer side, which are convenient for discharging and prevent clogging.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A kiln tail powder coarse and fine screening device of a rotary kiln, comprising a fixed plate (1), an inner cylinder (2) is rotatably mounted on the fixed plate (1), an outer cylinder (3) is sleeved on the outer periphery of the inner cylinder (2), the outer cylinder (3) is fixedly mounted on the fixed plate (1), a plurality of support seats (4) are fixedly mounted on the bottom side of the outer cylinder (3), the height of the support seats (4) decreases from left to right, a feed pipe (5) is connected to the fixed plate (1), the feed pipe (5) is connected to the cavity of the inner cylinder (2), a plurality of sieve holes (6) are provided on the inner cylinder (2), a first discharge port (7) and a second discharge port (8) are provided on the outer cylinder (3), characterized in that: A rotating shaft (9) is rotatably mounted on the fixed plate (1), a first spiral blade (10) is fixedly arranged on the outer periphery of the rotating shaft (9), the outer periphery of the first spiral blade (10) is in sliding contact with the inner wall of the inner cylinder (2), the outer periphery of the inner cylinder (2) is provided with a second spiral blade (11), the outer periphery of the second spiral blade (11) is in sliding contact with the inner periphery of the outer cylinder (3), a driving mechanism is arranged on the fixed plate (1) for driving the first spiral blade (10) and the second spiral blade (11) to rotate synchronously and in the opposite direction to the rotation of the inner cylinder (2), and the second spiral blade (11) is connected to the first spiral blade (10) via the driving mechanism.

2. The device for screening powder at the tail of a rotary kiln according to claim 1, characterized in that: The driving mechanism comprises a motor (20), the motor (20) is fixedly mounted on the fixed plate (1), a first gear (21) is fixedly mounted on the outer periphery of the rotating shaft (9), a second gear (22) is meshingly matched on one side of the first gear (21), the second gear (22) is fixedly connected to the output shaft of the motor (20), a first gear ring (23) is fixedly mounted on the inner wall of the inner cylinder (2), the first gear ring (23) is meshingly matched with the second gear (22), and a first gear ring (23) is fixedly mounted on the outer wall of the inner cylinder (2). Two toothed rings (24), one side of the second toothed ring (24) is meshed with a third gear (25), the third gear (25) is rotatably mounted on the fixed plate (1), one side of the third gear (25) is meshed with a third toothed ring (26), the third toothed ring (26) is fixedly mounted on an annular plate (27), the inner periphery and the outer periphery of the annular plate (27) are rotatably mounted on the inner cylinder (2) and the outer cylinder (3) in sequence, and the second spiral blade (11) is fixedly mounted on the annular plate (27) via a plurality of connecting rods.

3. The device for screening powder at the tail of a rotary kiln according to claim 2, characterized in that: One end of the feed pipe (5) extending into the inner cylinder (2) passes through the first gear ring (23).

4. The device for screening powder at the tail of a rotary kiln according to claim 3, characterized in that: A baffle (40) is provided inside the inner cylinder (2), and the feed pipe (5) is fixedly installed in a through hole opened on the baffle (40). The baffle (40) is rotatably connected to the outer periphery of the rotating shaft (9) and the inner wall of the inner cylinder (2).

5. The device for screening powder at the tail of a rotary kiln according to claim 1, characterized in that: The first discharge port (7) and the second discharge port (8) are both discharge ports that are narrow on the inside and wide on the outside.

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