A device for preventing material adhesion of a homogenizing and balling cylinder of laterite nickel ore

Abstract

The utility model relates to laterite nickel ore sintering production pelletizing technical field, and disclose a kind of laterite nickel ore mixing uniform pelletizing cylinder anti-sticking material device, including supporting system and the cylinder main body of being movably installed on it by supporting wheel, the cylinder roller is arranged in the cylinder main body outer wall and is drivingly connected with transmission system, the hollow shaft rod of being fixedly arranged is equipped in the cylinder main body, and the hollow shaft rod is provided with sprinkler in it, and its bottom is provided with multiple spray heads;At least one scraper device is fixedly connected on the hollow shaft rod, and the end of the scraper device is closely attached to the inner wall of cylinder main body.This laterite nickel ore mixing uniform pelletizing cylinder anti-sticking material device, by setting scraper device with cylinder wall is arranged in acute angle on the hollow shaft rod, material rolling can be continuously prevented and cleaned at the same time, and received a controllable axial thrust, effectively avoid the compaction, accumulation or stay time uneven situation of material due to poor progress.

Description

Technical Field

[0001] This utility model relates to the field of pelletizing technology in laterite nickel ore sintering production, specifically to a device for preventing material sticking in a laterite nickel ore mixing and pelletizing cylinder. Background Technology

[0002] Lateritic nickel ore, an important source of nickel metal, typically requires mixing and pelletizing before smelting to produce pellets with uniform composition and suitable strength for subsequent processes. A cylindrical pelletizer is a key piece of equipment in this process, using the rotation of the cylinder to tumble and knead the material into pellets. However, due to its physicochemical properties, lateritic nickel ore exhibits extremely high plasticity and viscosity when exposed to water. During pelletizing, the capillary forces and liquid-phase bridging forces generated between the fine particles of the material cause the wet, sticky material to easily agglomerate and adhere to all surfaces of the equipment it comes into contact with, especially the inner wall and internal components of the cylindrical pelletizer.

[0003] Existing technologies primarily employ anti-adhesion methods such as mechanical cleaning, vibration, and surface modification. Mechanical cleaning is the most common method, involving suspending multiple freely hanging flexible chains or wire ropes inside the cylinder and relying on their swinging motion to impact and beat the material; or installing fixed scrapers to scrape against the cylinder wall. Additionally, vibrators are installed on the outer wall of the cylinder to loosen and remove the adhesive layer through high-frequency vibration, and ultra-high molecular weight polyethylene linings or Teflon non-stick coatings are applied to the cylinder wall to reduce the adhesion between the material and the surface. While these methods are effective for general sticky materials, they all exhibit significant limitations when dealing with extremely viscous lateritic nickel ore.

[0004] While fixed scrapers can effectively remove the adhesion of extremely viscous lateritic nickel ore to the cylinder wall, they also create new cleaning dead zones, such as the back and root of the scraper, making it easy for material to accumulate on the scraper. Flexible chain devices, although simple in structure and low in cost, are prone to tangling with the water spray pipes or scrapers inside the cylinder due to their irregular oscillation. This not only negates the cleaning effect but can also lead to chain breakage, scraper deformation, and even equipment shutdown, posing a serious threat to production continuity. Therefore, existing technologies often struggle to achieve a balance between cleaning efficiency, operational reliability, and process interference. Thus, there is an urgent need for a new type of device that can adapt to the characteristics of lateritic nickel ore, efficiently prevent sticking, operate safely and stably, and not negatively interfere with the core pelletizing process. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a device for preventing material sticking in a laterite nickel ore mixing and pelletizing cylinder, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a device for preventing material sticking in a laterite nickel ore mixing and pelletizing cylinder, comprising a support system and a cylinder body movably mounted thereon via rollers. The outer wall of the cylinder body is provided with cylinder rollers and a transmission system is connected to them. A hollow shaft is fixedly installed inside the cylinder body, and a water spray pipe is installed inside the hollow shaft, with multiple nozzles at its bottom. At least one scraper device is fixedly connected to the hollow shaft, with its end tightly against the inner wall of the cylinder body. At least one anti-sticking system is also movably connected to the hollow shaft. The anti-sticking system includes a rigid connecting arm and a cleaning component. One end of the rigid connecting arm is fixed to the inner wall of the cylinder body, and the other end is movably sleeved on the hollow shaft. The cleaning component is installed on the rigid connecting arm via an overload protection device.

[0007] Optionally, the rigid connecting arm is Z-shaped, and its movable end is movably sleeved on the hollow shaft through a support ring.

[0008] Optionally, the cleaning component is a short chain.

[0009] Optionally, the scraper device is fixedly connected to the hollow shaft via a scraper bracket, and its blade surface forms an acute angle of 15° to 45° with the tangential direction of the inner wall of the cylinder body.

[0010] Optionally, the overload protection device includes two pressure-bearing bases and a pressure-bearing spring. The connecting end of the cleaning component is provided with an installation end, and the pressure-bearing spring causes the two pressure-bearing bases to clamp and fix the installation end inward.

[0011] Optionally, the overload protection device is a shear pin, which is sheared when the force acting on the cleaning component exceeds a preset value.

[0012] Optionally, the anti-sticking system is provided in multiple sets, which are distributed at intervals along the axial direction of the hollow shaft.

[0013] Optionally, the length of the scraper device is less than the length of the main body of the cylinder, and space is left at both ends for the fixed end of the rigid connecting arm to pass through.

[0014] This utility model provides a device for preventing material sticking in a laterite nickel ore mixing and pelletizing cylinder, which has the following beneficial effects: 1. The anti-sticking device for the laterite nickel ore mixing and pelletizing cylinder, by setting a scraper device on the hollow shaft at an acute angle to the cylinder wall, enables the rolling material to be continuously cleaned and prevented from sticking, while being subjected to a controllable axial thrust, effectively avoiding the compaction, accumulation or uneven residence time of the material due to poor advancement.

[0015] 2. The anti-sticking device for the laterite nickel ore mixing and pelletizing cylinder adopts an anti-sticking system that uses a "Z"-shaped rigid connecting arm in conjunction with a short chain. The movable end is sleeved on the hollow shaft and the mounting end is connected to the rigid connecting arm. The rigid connecting arm restricts the range of motion of the short chain, which can effectively avoid the entanglement, jamming, or even tearing of the water spray pipe or scraper caused by the excessive free swing amplitude of the traditional flexible long chain.

[0016] 3. The anti-sticking device for the laterite nickel ore mixing and pelletizing cylinder can effectively enhance the rapid response and self-protection capability of the entire system when encountering abnormal jamming by setting an overload protection device consisting of a pressure-bearing base and a pressure-bearing spring between the short chain and the rigid connecting arm, or by adopting a precisely calculated shear pin structure. This effectively reduces the risk of damage to core components of the equipment, such as the connecting arm and the cylinder, due to overload and the high maintenance costs.

[0017] 4. The anti-sticking device for the laterite nickel ore mixing and pelletizing cylinder, through the coordinated arrangement of the scraper device, rigid connecting arm, short chain, overload protection device and hollow shaft, greatly improves the cleaning coverage and anti-sticking efficiency. It solves the dilemma of existing technologies where a single scraper is prone to leaving dead corners or flexible chains are prone to entanglement and interference with the process, and achieves the unity of anti-sticking and process optimization. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the vertical cross-sectional structure of this utility model; Figure 3 This is a schematic diagram of the horizontal cross-sectional structure of this utility model; Figure 4 This is a schematic diagram of the multi-group anti-sticking system structure of this utility model; Figure 5 This utility model Figure 3 Enlarged schematic diagram of the structure at point A in the middle.

[0019] In the diagram: 1. Support system; 2. Main body of cylinder; 21. Cylinder roller; 3. Transmission system; 4. Hollow shaft; 41. Nozzle; 5. Scraper device; 51. Scraper bracket; 6. Rigid connecting arm; 7. Cleaning component; 71. Mounting end; 8. Overload protection device; 81. Pressure-bearing base; 82. Pressure-bearing spring. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Please see Figure 1-2This utility model provides a technical solution: It includes a support system 1, which is divided into front and rear groups. A cylindrical body 2 is movably mounted between the two groups of support systems 1 via rollers. An inner lining plate, made of wear-resistant steel plate installed on the inner wall of the cylindrical body 2, is provided inside the cylindrical body 2 to protect it from wear. A feed inlet is located at the top front end of the support system 1 and connected to a feeding device. A discharge outlet is located at the bottom rear end of the support system 1 and connected to a screening device. Cylindrical rollers 21 are installed on the outer wall of the cylindrical body 2, and a transmission system 3 is connected to the cylindrical body 21 via the rollers. The transmission system 3 is powered by a main motor. The system drives the rotation of the main cylinder 2, which rotates relative to the support system 1 along its central axis. The material inside the main cylinder 2 tumbles circumferentially while moving forward axially. A hollow shaft 4 is fixedly connected to the middle of the support system 1. The hollow shaft 4 is located on the central axis of the main cylinder 2 and passes through both ends of the support system 1. A water spray pipe is installed inside the hollow shaft 4, and spray nozzles 41 are evenly distributed at the bottom of the hollow shaft 4. The spray nozzles 41 are connected to the water spray pipe inside the hollow shaft 4. The water spray pipe adds water to the material inside the main cylinder 2 according to a specified ratio to achieve the appropriate moisture content. Through repeated tumbling and forward movement, the material completes mixing, balling, and conveying during operation. Please refer to [link / reference]. Figure 3 A scraper bracket 51 is fixedly connected to the middle of the hollow shaft 4, and a scraper device 5 is fixedly connected to the scraper bracket 51. The end of the scraper device 5 is close to the inner wall of the cylinder body 2 and parallel to the axis of the cylinder body 2. Its blade surface forms a small acute angle with the tangent direction of the cylinder wall, thereby giving the rolling material an axial thrust, controlling the forward speed of the material in the cylinder, achieving polishing and shaping of the pellets, and realizing auxiliary mixing. The scraper device 5 is fixedly connected to the middle of the hollow shaft 4 through the scraper bracket 51. The length of the scraper device 5 is less than the length of the cylinder body 2, and space is left at both ends for the fixed end of the rigid connecting arm 6 to pass through. A support ring is movably sleeved on the periphery of the hollow shaft 4, and a rigid connecting arm 6 is movably connected to the support ring. The rigid connecting arm 6 is Z-shaped, with its axial section rotatably fitted with the cleaning component 7. The rigid connecting arm 6 determines the movement trajectory and working radius of the cleaning component 7, ensuring it can only swing within a safe range and cannot be thrown into the narrow angle of the scraper device 5. This allows it to both impact the cylinder wall of the main body 2 and slide along the upper contour of the scraper device 5, achieving a combination of "impact" and "scraping." Because its rotation center is fixed, it will not become entangled. The other end of the rigid connecting arm 6 is a fixed end, fixedly connected to the inner wall of the main body 2, ensuring that the fixed end of the rigid connecting arm 6 does not interfere with the scraper device 5 during the rotation of the main body 2 around the hollow shaft 4. Please refer to [link to relevant documentation]. Figure 4Each scraper bracket 51 has a rigid connecting arm 6 on each side, forming an anti-sticking system. Multiple anti-sticking systems can be installed inside the main body 2 according to the length of the cylinder to control the length of the scraper device 5 and ensure the fixing strength of the scraper bracket 51. Please refer to... Figure 5 The connecting end of the cleaning component 7 is movably latched with an overload protection device 8. The overload protection device 8 is rotatably installed on the axial section of the rigid connecting arm 6. The overload protection device 8 includes a pressure-bearing base 81 and a pressure-bearing spring 82. The connecting end of the cleaning component 7 is provided with a chain mounting end 71. The pressure-bearing spring 82 is fixedly connected to the inner side of the two pressure-bearing bases 81, realizing the clamping and fixing of the chain mounting end 71 by the pressure-bearing bases 81. When the cleaning component 7 is jammed by abnormal materials such as large hard objects, the pressure-bearing base 81 at the overload protection device 8 first loosens its grip on the chain mounting end 71. The locking of end 71 protects the cleaning component 7 and the main body 2 from further damage, thereby protecting more expensive, core, or difficult-to-replace equipment components. The overload protection device 8 can also be a shear pin, which can withstand the force generated by the normal swing and impact of the chain. When the cleaning component 7 is suddenly jammed, the force acting on the shear pin increases sharply. When it exceeds its shear strength, the shear pin will be cut in two from the middle, and the cleaning component 7 will then separate from the rigid connecting arm 6, preventing the force from being transmitted to the cleaning component 7 itself, the rigid connecting arm 6, or even the structure of the main body 2.

[0022] In summary, the anti-sticking device for the laterite nickel ore mixing and pelletizing cylinder works as follows: First, the main motor of the transmission system 3 is started, and the power is transmitted through the cylinder roller 21, driving the cylinder body 2 to rotate slowly around its axis. Then, the feeding device is turned on, and the pre-mixed laterite nickel ore powder, binder and other raw materials are continuously and evenly fed into the rotating cylinder body 2 through the feed port at the front end of the support system 1. After the material enters the cylinder, it rises with the cylinder wall under the combined action of gravity, friction and centrifugal force. When it is lifted to a certain height, the material will fall in a "waterfall" shape due to its own weight. During this repeated lifting and falling process, the material particles undergo violent radial rolling and mixing. At the same time, the hollow shaft 4 that runs through the center of the cylinder starts to work. The water spray pipe inside sprays and humidifies the rolling material curtain through the evenly distributed nozzles 41 at the bottom according to the process specification, providing the liquid phase bridging force required for the material to form pellets, so that the fine particles gradually nucleate and grow into mother pellets.

[0023] The scraper device 5, fixed on the hollow shaft 4, then enters the working state. Its blade surface is close to the cylinder wall at a small acute angle, continuously scraping off the material that is slightly adhering to the cylinder wall, so that it returns to the material bed to participate in pelleting, keeping the cylinder wall smooth. Due to its inclined blade surface, it provides a continuous axial thrust to the rolling material bed while scraping the material. This not only controls the speed at which the material moves from the feed end to the discharge end, but also polishes and shapes the surface of the formed green pellets, thereby obtaining high-quality green pellets with more uniform particle size and smoother surface.

[0024] When the cylinder rotates, the "Z"-shaped rigid connecting arm 6, fixed to the inner wall, rotates accordingly, causing the short chain, which is movably set in its axial section, to swing within a set safety radius. This ensures that the short chain can effectively impact and pat the cylinder wall area cleaned by the scraper, further crushing the initial adhering material, and can also slide and tap along the contour of the scraper, achieving supplementary scraping, anti-sticking, and tapping vibration. This prevents material from adhering and accumulating on the scraper device 5. The rigid connecting arm 6's restriction on broken chains fundamentally eliminates the risk of traditional chains entangled in the scraper. If the short chain is accidentally jammed by large hard material blocks inside the cylinder during operation, the overload protection device 8 will immediately activate. Whether it is the loosening of the pressure base 81 or the breakage of the shear pin, the short chain will quickly detach from the rigid connecting arm 6, thus confining the destructive force to this local unit. This effectively protects the expensive rigid connecting arm 6, the cylinder body 2, and the transmission system 3 from damage. Afterwards, only the protection device or the short chain needs to be replaced to quickly restore production.

[0025] Under the combined action of the axial pushing of the scraper device and the natural inclination of the main body 2 of the cylinder, the qualified green balls after mixing, pelletizing and polishing finally reach the tail end of the cylinder, are discharged through the discharge port at the bottom of the support system 1, and enter the connected screening device for final grading.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances. Moreover, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for preventing sticking of laterite nickel ore into a pelletizing cylinder, comprising a support system (1) and a cylinder body (2) movably mounted thereon via rollers, wherein the outer wall of the cylinder body (2) is provided with cylinder rollers (21) and is connected to a transmission system (3), characterized in that: The main body (2) of the cylinder is provided with a fixed hollow shaft (4), which is provided with a water spray pipe and has multiple nozzles (41) at its bottom; at least one scraper device (5) is fixedly connected to the hollow shaft (4), and the end of the scraper device (5) is in close contact with the inner wall of the main body (2); at least one anti-sticking system is also movably connected to the hollow shaft (4), which includes a rigid connecting arm (6) and a cleaning component (7). One end of the rigid connecting arm (6) is fixed to the inner wall of the main body (2), and the other end is movably sleeved on the hollow shaft (4). The cleaning component (7) is installed on the rigid connecting arm (6) through an overload protection device (8).

2. The anti-sticking device for a laterite nickel ore mixing and pelletizing cylinder according to claim 1, characterized in that: The rigid connecting arm (6) is Z-shaped, and its movable end is movably sleeved on the hollow shaft (4) through a support ring.

3. The anti-sticking device for a laterite nickel ore mixing and pelletizing cylinder according to claim 1 or 2, characterized in that: The cleaning component (7) is a short chain.

4. The anti-sticking device for the mixing and pelletizing cylinder of laterite nickel ore according to claim 1, characterized in that: The scraper device (5) is fixedly connected to the hollow shaft (4) via the scraper bracket (51), and its blade surface forms an acute angle of 15° to 45° with the tangent direction of the inner wall of the cylinder body (2).

5. The anti-sticking device for a laterite nickel ore mixing and pelletizing cylinder according to claim 1, characterized in that: The overload protection device (8) includes two pressure-bearing bases (81) and a pressure spring (82). The connecting end of the cleaning component (7) is provided with an installation end (71). The pressure spring (82) causes the two pressure-bearing bases (81) to clamp and fix the installation end (71) inward.

6. The anti-sticking device for a laterite nickel ore mixing and pelletizing cylinder according to claim 1, characterized in that: The overload protection device (8) is a shear pin. When the force acting on the cleaning component (7) exceeds a preset value, the shear pin is sheared.

7. The anti-sticking device for a laterite nickel ore mixing and pelletizing cylinder according to claim 1, characterized in that, The anti-sticking system is provided in multiple sets, which are distributed at intervals along the axial direction of the hollow shaft (4).

8. The anti-sticking device for a laterite nickel ore mixing and pelletizing cylinder according to claim 4, characterized in that, The length of the scraper device (5) is less than the length of the main body (2), and space is left at both ends for the fixed end of the rigid connecting arm (6) to pass through.

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