A gravity-assisted scraping device for rotary kilns

Abstract

This utility model discloses a gravity-driven, slow-moving scraping device for rotary kilns, comprising a rotatable furnace tube, a central shaft rotating synchronously with the furnace tube, a slow-moving lifting ring, and a scraping assembly with a counterweight. It employs the principle of agricultural rakes to loosen clumped materials. The central shaft is fixedly connected to the furnace tube and rotates synchronously. The scraping assembly, through the slow-moving lifting ring, forms a relative rotational engagement with the central shaft. The scraping assembly, relying on its own weight, hangs naturally and is close to the inner wall of the furnace tube. The relative movement between the scraping assembly and the rotating furnace tube achieves scraping. This scraping device requires no external support, is easy to install, adapts to furnace tube deformation, and provides continuous and stable scraping, effectively solving the problem of material sticking and clumping on the walls of rotary kilns.

Description

Technical Field

[0001] This utility model relates to a material cleaning device for the inner wall of rotating cylinder equipment such as rotary kilns, drum dryers, and sintering kilns, and specifically to a rotary kiln scraping device with a central shaft rotating synchronously with the furnace and scraping material by its own weight. Background Technology

[0002] Existing rotary kiln scraping devices mostly employ a central fixed shaft or rigid scraper structure to loosen agglomerated materials. The central fixed shaft requires additional support, making installation complex, and thermal expansion of the furnace tubes can easily lead to eccentric jamming. Rigid scrapers rotate synchronously with the furnace tubes, offering no relative scraping effect and resulting in low cleaning efficiency. Furthermore, traditional movable scrapers lack a smoothing design, easily swinging with the shaft and failing to maintain continuous contact with the furnace wall. Therefore, improvements are needed to address these shortcomings, providing a scraping device suitable for rotary kilns producing various sticky, agglomerated materials. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides a gravity-driven, slow-motion scraping device for rotary kilns. Utilizing the principle of agricultural rakes, it loosens compacted materials. The device includes a kiln body with a rotatable furnace tube. A central shaft is fixedly connected inside the furnace tube. Multiple scraping assemblies are evenly arranged along the axial direction of the central shaft on the inner wall of the furnace tube. A slow-motion lifting ring is connected to the top of each scraping assembly and is installed on the outside of the central shaft. A gap is provided between the slow-motion lifting ring and the central shaft. A counterweight is installed on each scraping assembly.

[0004] Preferably, the inner wall of the furnace tube is provided with a baffle, which drives the scraping assembly to move slowly.

[0005] Preferably, a wear-resistant steel sleeve is provided on the inner side of the easing ring, and the inner diameter of the wear-resistant steel sleeve is larger than the outer diameter of the central shaft.

[0006] Preferably, the sum of the outer diameter of the easing lifting ring and the height of the scraping assembly is greater than the inner radius of the furnace tube.

[0007] Preferably, the scraping assembly includes a connecting rod connected to the easing lifting ring, a scraper movably connected to the connecting rod, lifting lugs at both ends of the scraper, the lifting lugs being movably connected to the connecting rod via pins, and a counterweight mounted on the scraper.

[0008] Preferably, the scraper includes a connecting plate, which is movably connected to the connecting rod via the lifting lug. A scraper is provided at the bottom of the connecting plate, and the counterweight is installed at the top of the connecting plate.

[0009] Preferably, the blade of the scraper is chamfered.

[0010] Preferably, the connecting rod is connected to the easing lifting ring and the lifting lug by a movable pin, which further enhances the easing of the scraping assembly and adapts to the slight deformation of the furnace tube.

[0011] This utility model has the following beneficial effects:

[0012] 1. The scraping device of this utility model eliminates the external fixed bracket of the central shaft and connects directly to the furnace tube, which is convenient to install and reduces the installation difficulty and equipment modification cost.

[0013] 2. This utility model, through the setting of a gap between the slow-moving lifting ring and the central shaft, allows the scraper to rotate relatively slowly under the friction of the baffle and the material when the furnace tube drives the central shaft to rotate synchronously. It does not swing synchronously with the shaft, and then maintains a natural hanging state under the gravity of the counterweight, sticking to the inner wall of the furnace tube. It generates relative rotational cooperation with the rotating inner wall of the furnace tube, continuously scraping off the material adhering to the inside of the furnace tube. The slow-moving lifting ring prevents the scraper from swinging with the shaft, ensuring the stability of the scraper against the wall and preventing it from swinging randomly. This achieves stable scraping and effectively avoids material sticking and caking. The scraping structure relies only on gravity and the rotation of the furnace tube to achieve scraping. The structure is simple, requires no additional power drive, and reduces production energy consumption.

[0014] 3. This utility model, through the movable connection structure of the scraper assembly and the design of the counterweight block, can adaptively adjust its position according to the deformation of the inner wall of the furnace tube, avoiding the scraper jamming. It adopts simple transmission components, has high versatility, and is suitable for rotary drum equipment for processing viscous materials such as drying furnaces, sintering furnaces, and activation furnaces. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the connection structure between the scraping assembly, the easing lifting ring, and the central shaft of this utility model;

[0017] Figure 3 This is an axial view of the connection structure between the scraper assembly and the easing lifting ring of this utility model;

[0018] Figure 4 This is a schematic diagram of the axial movement of the scraper of this utility model.

[0019] In the diagram: 1. Furnace body; 2. Furnace tube; 3. Central shaft; 4. Slow-moving lifting ring; 5. Scraper assembly; 6. Connecting rod; 7. Connecting plate; 8. Scraper; 9. Pin; 10. Lifting lug; 11. Counterweight; 12. Baffle. Detailed Implementation

[0020] To make the technical problems, technical solutions and advantages of this utility model clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0021] This utility model provides a rotary kiln scraping device that is easy to install, requires no additional fixed support, adapts to the thermal expansion and eccentricity of the furnace tube, allows the scraper to hang down slowly and continuously clean the material against the wall. It adopts the principle of agricultural rake to loosen the caking material, and solves the problems of jamming, incomplete cleaning and complicated installation of existing devices.

[0022] like Figure 1-4 As shown, this utility model provides a gravity-driven slow-motion scraping device for a rotary kiln, including a kiln body 1. A rotatable furnace tube 2 is provided on the kiln body 1. A central shaft 3 is fixedly connected inside the furnace tube 2. The central shaft 3 and the furnace tube 2 can rotate synchronously. A baffle 12 is provided on the inner wall of the furnace tube 2. Multiple sets of scraping components 5 are evenly arranged on the inner wall of the furnace tube 2 along the axial direction of the central shaft 3, covering the entire area inside the furnace tube 2 that needs to be scraped. There is no interference between the scraping components 5. When the furnace tube 2 rotates, the friction between the material and the baffle 12 drives the scraping components 5 to rotate slowly in a small amplitude.

[0023] The scraper assembly 5 includes a connecting rod 6, which is movably connected to a scraper. Both ends of the scraper are provided with lifting lugs 10, which are movably connected to the connecting rod 6 via pins 9. The scraper includes a connecting plate 7, which is connected to the connecting rod 6 via the lifting lugs 10. The bottom of the connecting plate 7 is provided with a scraper 8 with a chamfered blade, and the top of the connecting plate 7 is equipped with a counterweight 11. The weight of the counterweight 11 is adjusted according to the diameter of the furnace tube 2 to ensure that the wall-adhering pressure is appropriate.

[0024] A slow-moving lifting ring 4 is connected to the top of the connecting rod 6. The connecting rod 6 is fixedly connected to the slow-moving lifting ring 4 by a movable pin. The connection of the connecting rod 6 by the movable pin further enhances the slow-moving property of the scraper assembly 5 and adapts to the slight deformation of the furnace tube 2. The slow-moving lifting ring 4 is installed on the outside of the central shaft 3. A gap is provided between the slow-moving lifting ring 4 and the central shaft 3. The sum of the outer diameter of the slow-moving lifting ring 4 and the height of the scraper assembly 5 is greater than the inner radius of the furnace tube 2, so that the bottom of the scraper is always close to the inner wall of the furnace tube 2, realizing the delayed slow-moving effect of the scraper assembly 5 and the slow-moving lifting ring 4, and not swinging synchronously with the central shaft 3. A wear-resistant steel sleeve with an inner diameter of the inner diameter of the central shaft 3 is provided on the inner side of the slow-moving lifting ring 4 to reduce the friction of the slow-moving lifting ring 4.

[0025] The operation process of this utility model is as follows: After the rotary kiln is turned on, the furnace tube 2 starts to rotate, driving the central shaft 3 and the baffle 12 to rotate synchronously. Under the friction of the material inside the furnace tube 2 and the baffle 12, the scraping assembly 5 and the slow-moving lifting ring 4 have a slight tendency to rotate with it. At this time, the scraping assembly 5 rotates slowly relative to the central shaft 3. Then, under the action of the weight of the scraping assembly 5 itself and the weight of the counterweight 11, the rotational force is counteracted, and the scraping assembly 5 remains in a natural hanging state. Under the action of the movable connection structure of the scraping assembly 5 and the counterweight 11, the bottom end of the scraper is always close to the inner wall of the furnace tube 2. During this process, the scraping assembly 5 and the rotating inner wall of the furnace tube 2 generate relative motion. The scraping assembly 5 completes the scraping action, realizing the relative motion between the rotation of the furnace tube 2 and the scraper, and continuously scraping off the material adhering to the inside of the furnace tube 2.

[0026] Among them, such as Figure 4 As shown, the axial movement sequence of the scraper is as follows: When the furnace tube 2 is rotated clockwise, the scraper slowly rotates clockwise relative to the central axis 3 under the action of the material and the baffle 12. Then, under the action of the movable connecting structure and the counterweight 11, the rotational force is counteracted, and the scraper remains in a natural drooping state. After the scraper rotates counterclockwise back to its original position, due to inertia, the scraper will rotate counterclockwise to the other side. Then, under the action of the rotational force of the furnace tube 2 and the action of the movable connecting structure and the counterweight 11, the scraper rotates clockwise back to its original position. Then, the scraper repeats the rotation sequence again for continuous rotation. During the entire continuous rotation process, the bottom end of the scraper is always close to the inner wall of the furnace tube 2 to achieve scraping.

Claims

1. A gravity-actuated scraping device in a rotary furnace, characterized by: The furnace includes a furnace body (1), on which a rotatable furnace tube (2) is provided. A central shaft (3) is fixedly connected inside the furnace tube (2). Multiple sets of scraping assemblies (5) are evenly arranged on the inner wall of the furnace tube (2) along the axial direction of the central shaft (3). A slow-moving lifting ring (4) is connected to the top of the scraping assembly (5). The slow-moving lifting ring (4) is installed on the outside of the central shaft (3). A gap is provided between the slow-moving lifting ring (4) and the central shaft (3). A counterweight (11) is installed on the scraping assembly (5).

2. A gravity-actuated scraping device for use in a rotary furnace as defined in claim 1, characterized in that: The inner wall of the furnace tube (2) is provided with a baffle (12), which drives the scraper assembly (5) to move slowly.

3. A gravity-actuated scraping device for use in a rotary furnace as defined in claim 1, characterized in that: The inner side of the slow-moving lifting ring (4) is provided with a wear-resistant steel sleeve, and the inner diameter of the wear-resistant steel sleeve is larger than the outer diameter of the central shaft (3).

4. A gravity-actuated scraping device for use in a rotary furnace as defined in claim 1, characterized in that: The sum of the outer diameter of the slow-moving lifting ring (4) and the height of the scraping assembly (5) is greater than the inner radius of the furnace tube (2).

5. A gravity-actuated scraper device for use in a rotary kiln as defined in claim 1, wherein: The scraper assembly (5) includes a connecting rod (6), which is connected to the easing ring (4). A scraper is movably connected to the connecting rod (6), and lifting lugs (10) are provided at both ends of the scraper. The lifting lugs (10) are movably connected to the connecting rod (6) via a pin (9). The counterweight (11) is installed on the scraper.

6. A gravity-actuated scraping device for use in a rotary kiln as defined in claim 5, characterized in that: The scraper includes a connecting plate (7), which is movably connected to the connecting rod (6) via the lifting lug (10). A scraper (8) is provided at the bottom of the connecting plate (7), and a counterweight (11) is installed at the top of the connecting plate (7).

7. A gravity-actuated scraping device for use in a rotary kiln as defined in claim 6, characterized in that: The blade of the scraper (8) is chamfered.

8. A gravity-actuated scraping device for use in a rotary kiln as defined in claim 6, characterized in that: The connecting rod (6) is connected to the slow-moving lifting ring (4) and the lifting lug (10) by means of a movable pin.

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