A mixer for smelting industry

Abstract

The present application relates to the technical field of metal smelting, in particular to a mixer for smelting industry, which comprises a cylinder, the cylinder rotates around a self-made axis, characterized in that one end of the cylinder is rotatably connected with a feeding end cover, the other end is rotatably connected with a discharging and dedusting mechanism; the feeding end cover and the discharging and dedusting mechanism are connected with a central shaft, the central shaft is rotatably connected with a shaft tube outside, the outer wall of the shaft tube is arranged with a stirring mechanism, the direction in which the shaft tube drives the stirring mechanism to rotate is opposite to the rotating direction of the cylinder, and the stirring mechanism makes the material fly to the direction of the central shaft. The stirring mechanism inside the cylinder makes the material fly to the direction of the central shaft when rotating, and also flies to the direction of the feeding end cover, so that the material is more concentrated at the feeding end of the cylinder, and the short cylinder realizes the uniform dispersion of the material.

Description

Technical Field

[0001] This invention relates to the field of metal smelting technology, and more specifically to a mixing machine for the smelting industry. Background Technology

[0002] In metal smelting, the quantity and content of ore supply have a crucial impact on the quality of the smelted products. Currently, there are many types of metal ores, with varying properties and qualities, and these differences in raw materials directly affect product quality. The granulation process determines the subsequent processes; therefore, to enhance sintering production, it is necessary to start with mixing and granulation.

[0003] Currently, the mixing and granulation of ore pellets is mainly accomplished by cylindrical mixers, which are large, low-speed mixing devices with a diameter of 2.5-5m and a length of 7-20m. The cylindrical mixer is mainly divided into three functional sections: a mixing section, a water addition section, and a pelletizing section. The mixing section is used to mix the materials evenly, the water addition section is mainly used to wet the materials, and the pelletizing section makes the wetted materials roll into pellets. However, because the diameter and length of the cylinder are relatively large and the rotation speed is slow, the rotation state determines that the materials cannot be tumbled and mixed too many times inside, which often leads to uneven mixing, difficulty in pelletizing, or serious material sticking inside the cylinder.

[0004] Although many technical personnel in related fields have also conducted relevant research in this area and published many papers, such as Chen Dong's "Improved Design of Mixing and Granulating Cylinder" published in Equipment and Automation, April 2010, No. 2, and Zhu Deqing et al.'s "Research on Material Sticking Mechanism of Cylinder Mixer" published in Sintering and Pelletizing, October 2020, Vol. 45, No. 5, etc., there are many improvement solutions for this technical problem. However, most of them are analyzed from the perspective of material ratio, water spray ratio, etc., and there are few solutions that improve the structure of the mixer itself.

[0005] Therefore, developing a mixing machine for the smelting industry to enhance material mixing and reduce the problem of material sticking to the cylinder walls is an urgent problem that technical personnel in the field need to solve. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a mixer for the smelting industry, which achieves uniform material mixing, prevents material from sticking to the walls of the cylinder, and allows for material mixing and granulation with a shorter cylinder length compared to other mixers.

[0007] To achieve the above objectives, the embodiments of the present invention specifically adopt the following technical solutions:

[0008] A mixing machine for the smelting industry includes a cylinder supported by rollers, the cylinder rotating about a self-made axis, a feed end cover rotatably connected to one end of the cylinder, and a discharge dust removal mechanism rotatably connected to the other end of the cylinder.

[0009] A central shaft connects the feed end cover and the discharge dust removal mechanism. A shaft tube is rotatably connected to the outside of the central shaft. A stirring mechanism is arranged on the outer wall of the shaft tube. The shaft tube drives the stirring mechanism to rotate in the opposite direction to the rotation of the cylinder. The stirring mechanism causes the material to fly towards the central shaft.

[0010] Furthermore, the stirring mechanism includes a stirring rod and a paddle. One end of the stirring rod is connected to the outer wall of the shaft tube, and the other end is connected to the paddle. The paddle has a guide surface in a twisted state, which guides the material towards the central axis and disperses it slightly towards the feed end cover.

[0011] Furthermore, one end of the blade is close to the inner wall of the cylinder, and the other end is away from the inner wall of the cylinder. The end of the blade away from the inner wall of the cylinder is in a twisted state, and the corner of the two corners of this end that is away from the feed end cover is twisted towards the central axis.

[0012] Furthermore, the blade has a symmetrical structure, with both ends close to the inner wall of the cylinder and the middle part away from the inner wall of the cylinder. The stirring rod is connected to the center of the blade, and the side of the blade away from the cylinder in the middle is curved upward.

[0013] Furthermore, the stirring rod includes a connecting rod and a sleeve. The connecting rod has inclined threaded holes, and the sleeve has inclined bolt holes. The inclined arrangement direction of the threaded holes on the connecting rod is opposite to the inclined arrangement direction of the bolt holes on the sleeve. The sleeve is connected by bolts that pass through the bolt holes and are installed in the threaded holes.

[0014] Furthermore, the rotational speed of the shaft tube is higher than that of the cylinder.

[0015] Furthermore, the inner wall of the feed end of the cylinder is provided with internal teeth, the shaft tube of the feed end of the cylinder is connected to a first gear, and the feed end cover is connected to a second gear that meshes with the internal teeth and the first gear respectively.

[0016] Furthermore, the central shaft is a hollow tube with a partition plate in the middle. The partition plate divides the central shaft into a water supply pipe section and a powder blowing pipe section. The water supply pipe section is connected to a nozzle at one end near the partition plate, and the open end extends out of the feed end cover and is connected to a water pipe. The powder blowing pipe section is provided with multiple through holes near the partition plate, and the open end extends out of the discharge and dust removal mechanism and is connected to the powder blowing mechanism.

[0017] Furthermore, the plurality of through holes are arranged along the upper arcuate surface of the central axis.

[0018] Furthermore, multiple powder guiding tubes are arrayed on the inner wall of the cylinder. The powder guiding tubes are straight tubes, with one end located between the nozzle and the stirring mechanism, and the other end corresponding to the through hole on the powder blowing tube.

[0019] The beneficial effects of the embodiments of the present invention are as follows:

[0020] 1. The present invention utilizes the stirring mechanism inside the cylinder to disperse the material towards the central axis and also towards the feed end cover when rotating. On the one hand, the material is more concentrated at the feed end of the cylinder, and the material is evenly dispersed with a shorter cylinder. On the other hand, it can also reduce the power consumption of starting and stopping the cylinder.

[0021] 2. The present invention is provided with a powder blowing pipe and a powder guiding pipe, which transfer a portion of the mixed powder to the pellet section and sprinkle it down, so that it falls on the surface of the pellets and the inner wall of the cylinder, thereby reducing the situation of material sticking to the inner wall of the cylinder. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a cross-sectional front view of the present invention;

[0024] Figure 3 for Figure 2 Sectional view along axis AA;

[0025] Figure 4 This is a schematic diagram of the connection between the shaft tube and the stirring mechanism of the present invention;

[0026] Figure 5 This is a right view showing the connection between the shaft tube and the stirring mechanism of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of the stirring rod and impeller of the present invention;

[0028] Figure 7 This is a schematic diagram of the connecting rod of the present invention;

[0029] Figure 8 This is a schematic diagram of another structure of the blade of the present invention.

[0030] In the diagram: 1. Idler roller; 2. Cylinder; 3. Support; 4. Feed end cover; 5. Discharge and dust removal mechanism; 6. Feed hopper; 7. Central shaft; 8. Shaft tube; 9. Agitator; 10. Agitator rod; 11. Blade; 12. Connecting rod; 13. Sleeve; 14. Threaded hole; 15. Bolt hole; 16. Internal gear; 17. First gear; 18. Second gear; 19. Separator plate; 20. Nozzle; 21. Through hole; 22. Powder guide pipe. Detailed Implementation

[0031] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0032] See Figure 1 ,Figure 2 and Figure 3 As shown, this embodiment discloses a mixing machine for the smelting industry, including a cylinder 2 supported by a roller 1. The roller 1 is fixedly connected to a bracket 3. The left end of the cylinder 2 is higher than the right end. The cylinder 2 rotates around a self-made axis. The left end of the cylinder 2 is rotatably connected to a feed end cover 4, and the right end is rotatably connected to a discharge dust removal mechanism 5. The feed end cover 4 is also provided with a feed hopper 6. The lower end of the discharge dust removal mechanism 5 is open for discharge, and the upper end is connected to a dust collector.

[0033] Both the feed end cover 4 and the discharge dust removal mechanism 5 are fixed components. A central shaft 7, coaxial with the cylinder 2, connects the feed end cover 4 and the discharge dust removal mechanism 5. A shaft tube 8 is rotatably connected to the outside of the central shaft 7. The shaft tube 8 is driven to rotate around the central shaft 7. This drive comes from an independent driver outside the cylinder 2 or a linkage component inside the cylinder 2. A stirring mechanism 9 is arranged on the outer wall of the shaft tube 8. When the shaft tube 8 rotates, it drives the stirring mechanism 9 to rotate in the opposite direction to the rotation direction of the cylinder 2. Figure 3 , Figure 4 and Figure 5 As shown, the stirring mechanism 9 includes a stirring rod 10 and a blade 11. One end of the stirring rod 10 is connected to the outer wall of the shaft tube 8, and the other end is connected to the blade 11. The blade 11 is a curved plate or at least a solid structure with such a curved surface. The length direction of the curved surface is arranged along the circumference of the cylinder 2. Then, the end facing the rotation direction is close to the cylinder 2 to gather the material on the blade 11. The end facing away from the rotation direction or the middle of the blade 11 is far away from the inner wall of the cylinder 2 and has a torsional state. The torsional state is that the end facing the feed end cover 4 is closer to the inner wall of the cylinder 2, and the end facing the discharge dust removal mechanism 5 is closer to the central axis 7. In this way, when the stirring mechanism 9 rotates, the material is scattered towards the central axis 7 and also towards the feed end cover 4.

[0034] In this embodiment, the stirring mechanism 9 causes the material to fly towards the central axis 7, which obstructs the discharge of material to the right end of the cylinder 2. More material can be concentrated on the left side of the cylinder 2. The material flies away and mixes with other materials when the stirring mechanism 9 rotates, which can make it more uniform and more fully mixed. The material is dispersed with a shorter cylinder 2.

[0035] To achieve continuous and efficient production, the diameter of cylinder 2 is typically large, generally ranging from 2.5 to 5 meters, and the length from 7 to 20 meters. Due to the influence of the critical speed, cylinder 2 cannot rotate too fast; the empirical formula is as follows: Where R is the effective radius of cylinder 2; and the standard rotation speed of the primary mixer is 0.2n-0.3n, so the rotation speed of cylinder 2 is very slow, which leads to a slow material mixing speed. However, because the stirring mechanism 9 rotates in the opposite direction, the mixing of materials can be accelerated. At the same time, because the stirring mechanism 9 rotates in the opposite direction, the material will not rise too high along the inner wall of cylinder 2 as cylinder 2 rotates. The left-high and right-low tilt of cylinder 2 has less impact on the material movement speed, which can also increase the mixing time of materials. More importantly, the stirring mechanism 9 rotates in the opposite direction, so the material moves in the opposite direction of the rotation of cylinder 2. When restarting after a mid-term shutdown for maintenance, the power required to start cylinder 2 is less than that of existing equipment, and the start and stop are smoother.

[0036] like Figure 6 As shown, in some embodiments of this application, the blade 11 is a curved panel body, one end of the blade 11 is close to the inner wall of the cylinder 2 and the other end is away from the inner wall of the cylinder 2. The end of the blade 11 away from the inner wall of the cylinder 2 is in a twisted state, and the corner of the two corners of this end that is away from the feed end cover 4 is twisted towards the central axis 7.

[0037] like Figure 8 As shown, in some other embodiments of this application, the blade 11 is a block-shaped body with a relatively symmetrical guide surface. The guide surface is located on the side of the blade 11 facing the central axis 7. The two ends of the guide surface are close to the inner wall of the cylinder 2, and the middle part is arched away from the inner wall of the cylinder 2. At the same time, the height and sharpness of the arch on the side of the guide surface facing the discharge dust removal mechanism 5 are higher than those on the side facing the feed end cover 4.

[0038] like Figure 6 and Figure 7 As shown, in this embodiment, the mixer mainly mixes metal ore powder and binder. Depending on the filling amount, the depth of the blade 11 entering the metal ore powder needs to be adjusted to reduce power loss. Therefore, the above-mentioned stirring rod 10 is composed of a connecting rod 12 and a sleeve 13. The connecting rod 12 is provided with inclined threaded holes 14, and the sleeve 13 is provided with inclined bolt holes 15. The inclined direction of the threaded holes 14 on the connecting rod 12 is opposite to the inclined direction of the bolt holes 15 on the sleeve 13. The sleeve 13 is connected by bolts that pass through the bolt holes 15 and are installed in the threaded holes 14. The intersecting hole structure can effectively ensure the strength of the connecting rod 12 and the sleeve 13 and avoid stress concentration caused by adjacent holes being too close.

[0039] In some embodiments of the present invention, a separate motor is typically used to control the rotation of the shaft tube 8. This makes maintenance of each part of the structure more convenient and allows the cylinder 2 and the shaft tube 8 to start at different times. For example, when the shaft tube 8 starts to rotate, the powder inside the cylinder 2 is stirred and becomes more concentrated on the rear side of the cylinder 2 in the direction of rotation. The instantaneous power of the cylinder 2 at startup can be reduced to a very small value, even smaller than during normal operation. This allows the main motor to reduce its rated power significantly and saves costs.

[0040] To achieve a better mixing effect, the rotational speed of the shaft tube 8 should be higher than the rotational speed (angular velocity) of the cylinder 2. In addition to the above technical solutions, a planetary gear acceleration mechanism can also be used to achieve this.

[0041] like Figure 2 As shown, in some other embodiments of the present invention, an internal tooth 16 is provided on the inner wall of the feed end of the cylinder 2, a first gear 17 is connected to the shaft tube 8 of the feed end of the cylinder 2, and a second gear 18 is connected to the feed end cover 4, which meshes with the internal tooth 16 and the first gear 17 respectively.

[0042] like Figure 2 As shown, in this embodiment, other components of the mixer are improved. Usually, the water spraying part in the mixer is suspended by a bracket and extends into the middle of the cylinder 2. However, in this embodiment, the central shaft 7 is used as a water supply pipe. The central shaft 7 is a hollow tube with a partition plate 19 in the middle. The partition plate 19 divides the central shaft 7 into a water supply pipe section and a powder blowing pipe section. The water supply pipe section is connected to a nozzle 20 at one end near the partition plate 19, and the open end extends out of the feed end cover 4 and is connected to a water pipe. The powder blowing pipe section is provided with multiple through holes 21 near the partition plate 19, and the open end extends out of the discharge dust removal mechanism 5 and is connected to the powder blowing mechanism.

[0043] The powder blowing method is mainly aimed at the formed pellets. During the rolling process of the pellets in the cylinder 2, the inner wall of the cylinder 2 is prone to material sticking. The reason is that the pellets are newly formed and the surface is still covered with moisture. When they come into contact with the inner wall of the cylinder 2, the inner wall of the cylinder 2 becomes wet and the material sticks to it. After powder blowing, dry powder enters the inside of the cylinder 2 along the central axis 7 and disperses inside the cylinder 2. Some of it lands on the pellets and some lands on the inner wall of the cylinder 2, which can separate the pellets from the inner wall of the cylinder 2, making it more difficult for the moisture on the pellets to transfer to the inner wall of the cylinder 2. If the powder is taken from other minerals and may even contain certain other elements that promote sintering, the powder blowing mechanism can be a screw conveyor and a blower, or it can be just a blower.

[0044] Multiple through holes 21 are arranged along the upper arc-shaped surface of the central axis 7 to allow air to blow upward as much as possible, so that the powder is dispersed more evenly and preferentially contacts the inner wall of the cylinder 2.

[0045] Multiple powder guiding tubes 22 are arrayed on the inner wall of the cylinder 2. The powder guiding tubes 22 are straight tubes and are parallel to the cylinder 2. One end of the powder guiding tube 22 is located between the nozzle 20 and the stirring mechanism 9, and the other end corresponds to the through hole 21 on the powder blowing tube.

[0046] The powder guide tube 22 transfers the mixed powder to the right end of the cylinder 2. The powder transferred by the powder guide tube 22 does not contain water, but acts as a separator between the pellets to reduce the moisture content of the pellets and reduce the sticking of material to the inner wall of the cylinder 2 due to excessive moisture.

[0047] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0050] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A mixing machine for the smelting industry, comprising a cylinder that rotates about a self-designed axis, characterized in that, One end of the cylinder is rotatably connected to a feed end cover, and the other end is rotatably connected to a discharge and dust removal mechanism; A central shaft connects the feed end cover and the discharge dust removal mechanism. A shaft tube is rotatably connected to the outside of the central shaft. A stirring mechanism is arranged on the outer wall of the shaft tube. The direction in which the shaft tube drives the stirring mechanism to rotate is opposite to the direction of rotation of the cylinder. The stirring mechanism includes a stirring rod and a blade. One end of the stirring rod is connected to the outer wall of the shaft tube, and the other end is connected to the blade. The blade has a guide surface in a torsional state. The stirring mechanism causes the material to fly towards the central shaft. One end of the blade is close to the inner wall of the cylinder, and the other end is away from the inner wall of the cylinder. The end of the blade away from the inner wall of the cylinder is in a twisted state, and the corner of the two corners at this end that is away from the feed end cover is twisted toward the central axis. The central shaft is a hollow tube with a partition plate in the middle. The partition plate divides the central shaft into a water supply pipe section and a powder blowing pipe section. The water supply pipe section is connected to a nozzle at one end near the partition plate, and the open end extends out of the feed end cover and is connected to a water pipe. The powder blowing pipe section is provided with multiple through holes near the partition plate, and the open end extends out of the discharge and dust removal mechanism and is connected to the powder blowing mechanism. The plurality of through holes are arranged along the upper arcuate surface of the central axis; Multiple powder guiding tubes are arrayed on the inner wall of the cylinder. The powder guiding tubes are straight tubes, with one end located between the nozzle and the stirring mechanism, and the other end corresponding to the through hole on the powder blowing tube.

2. The mixing machine for the smelting industry according to claim 1, characterized in that, The blades have a symmetrical structure, with both ends close to the inner wall of the cylinder and the middle part away from the inner wall of the cylinder. The stirring rod is connected to the center of the blades, and the middle part of the blades, away from the cylinder, curves upward.

3. The mixing machine for the smelting industry according to claim 1, characterized in that, The stirring rod includes a connecting rod and a sleeve. The connecting rod has inclined threaded holes, and the sleeve has inclined bolt holes. The inclined direction of the threaded holes on the connecting rod is opposite to the inclined direction of the bolt holes on the sleeve. The sleeve is connected by bolts that pass through the bolt holes and are installed in the threaded holes.

4. The mixing machine for the smelting industry according to claim 1, characterized in that, The rotational speed of the shaft tube is higher than that of the cylinder.

5. The mixing machine for the smelting industry according to claim 1, characterized in that, The inner wall of the feed end of the cylinder is provided with internal teeth, and a first gear is connected to the shaft tube of the feed end of the cylinder. A second gear is connected to the feed end cover, which meshes with the internal teeth and the first gear respectively.

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