Pellet binder raw material drying device

Abstract

The utility model discloses a kind of pellet binder raw material drying devices, including cylinder, feed hopper located in the upper portion of the front end of cylinder and discharge hopper located in the lower portion of the rear end of cylinder, further including hot air machine, motor, wall scraping part and induced draft fan;The hot air machine is communicated with the head at the front end of cylinder by pipeline;The motor is detachably connected in the middle of head, and motor output end is fixedly connected with the wall scraping part that extends inside cylinder;The middle end and rear end of straight cylinder section of the cylinder are communicated with induced draft fan by pipeline.The utility model has the advantages that: the present application effectively solves the problem of walling and caking of viscous materials such as bentonite during the drying process, improves the drying efficiency and the uniformity of product drying.

Description

Technical Field

[0001] This utility model relates to the field of pellet binder raw material drying technology, and in particular to a pellet binder raw material drying device. Background Technology

[0002] Pellet binder refers to one or more substances added to iron concentrate powder during the iron ore pelleting process. Its core function is to provide binding force during the pelletizing stage, enabling the fine powder material to roll and form pellets with a certain green pellet strength and thermal stability. Bentonite is typically used as the raw material for pellet binder. The raw materials for pellet binder usually need to be dried. However, in existing pellet binder raw material drying equipment, the material tends to stick to the cylinder after entering the cylinder, and the accumulation of raw material on the rotating cylinder leads to uneven drying. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a pellet binder raw material drying device.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A pellet binder raw material drying device includes a cylinder, a feed hopper located at the upper front end of the cylinder, and a discharge hopper located at the lower rear end of the cylinder. It also includes a hot air blower, a motor, a wall scraper, and an induced draft fan. The hot air blower is connected to the end cap at the front end of the cylinder through a pipe. The motor is detachably connected to the middle of the end cap, and the motor output end is fixedly connected to the wall scraper extending into the cylinder. The middle and rear ends of the straight section of the cylinder are connected to the induced draft fan through pipes.

[0006] Furthermore, the wall scraping part includes a rotating shaft, a connecting plate, a scraper, and a support member; one end of the rotating shaft extends out of the end cap and can rotate relative to the end cap; the other end of the rotating shaft is rotatably connected to the lower end of the support member; the upper end of the support member is fixedly connected to the inner wall of the straight section; several connecting plates are equally spaced vertically on the rotating shaft; a scraper is provided at the end of the connecting plate; the end of the scraper away from the connecting plate contacts the inner wall of the straight section.

[0007] Furthermore, the cross-section of the scraper is curved in the direction of rotation.

[0008] Furthermore, the total area swept by the rotating scrapers of several blocks is greater than the inner wall area of ​​the straight section.

[0009] Furthermore, the scraper projection is an isosceles trapezoid.

[0010] Furthermore, the central axis of the cylinder forms an angle of 10° to 15° with the horizontal line.

[0011] The beneficial effects of this utility model are:

[0012] This application effectively solves the problem of wall caking and agglomeration of viscous raw materials such as bentonite during the drying process, and improves drying efficiency and product drying uniformity. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a longitudinal sectional view of the combined structure of the straight section and the scraped wall section;

[0015] Figure 3 This is a transverse sectional view of the combined structure of the straight section and the scraped wall section.

[0016] In the picture,

[0017] 1-Cylinder body, 2-Feed hopper, 3-Discharge hopper, 4-Hot air blower, 5-Motor, 6-Wall scraper, 7-Exhaust fan;

[0018] 11-End cap, 12-Straight section;

[0019] 61-Shaft, 62-Connecting plate, 63-Scraper, 64-Support component. Detailed Implementation

[0020] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0021] Reference Figure 1-3As shown, a pellet binder raw material drying device includes a cylinder 1, a feed hopper 2 located at the upper front end of the cylinder 1, and a discharge hopper 3 located at the lower rear end of the cylinder 1. It also includes a hot air blower 4, a motor 5, a wall scraper 6, and an induced draft fan 7. The hot air blower 4 is connected to the end cap 11 at the front end of the cylinder 1 via a pipe. The motor 5 is detachably connected to the middle of the end cap 11, and the output end of the motor 5 is fixedly connected to the wall scraper 6 extending into the cylinder 1. The middle and rear ends of the straight section 12 of the cylinder 1 are connected to the induced draft fan 7 via pipes. The induced draft fan 7 is responsible for extracting the waste gas containing water vapor from the cylinder 1, maintaining a certain negative pressure within the drying system, preventing dust overflow, and promoting the flow of hot air. The induced draft fan 7 is connected to the middle and rear ends of the straight section 12 of the cylinder 1 via pipes (e.g., insulated pipes). Preferably, two or more waste gas outlets are provided, for example, one located in the middle region of the straight section 12 and another near the rear end region of the straight section 12, to more effectively discharge wet waste gas from different regions. The suction force of the induced draft fan 7 needs to be matched with the air volume of the hot air fan 4 in order to maintain a suitable airflow velocity and negative pressure state inside the cylinder. The induced draft fan 7 is a commercially available product, and those skilled in the art can make a reasonable selection according to their needs.

[0022] It should be noted that the cylinder 1 constitutes the main chamber of the drying process, and is preferably a cylindrical structure made of heat-resistant metal (such as stainless steel or carbon steel) with a certain thickness. The central axis of the cylinder 1 forms an angle of 10°~15° (e.g., 12°) with the horizontal line, so that the material can move slowly from the feed end to the discharge end under the action of gravity, while providing sufficient residence time. The scraper speed (e.g., 5~30 rpm) can be adjusted according to the material moisture and output. The front end (i.e., the higher end) of the cylinder 1 is provided with a head 11, preferably an elliptical head, which is sealed to the straight section 12 of the cylinder 1 by flange or welding. The rear end (i.e., the lower end) of the cylinder 1 is open, and the discharge hopper 3 is located at the lower part of the rear end of the cylinder 1 for collecting the dried raw materials (such as bentonite). The feed hopper 2 is located at the upper part of the front end of the cylinder 1, preferably in the area of ​​the head 11 or at the top of the straight section 12 adjacent to the head 11. The feed hopper 2 is welded to the cylinder 1 and is used to continuously or intermittently feed wet materials (such as hydrated bentonite) into the drying chamber. A hot air blower 4 provides the hot air required for drying. The hot air blower 4 is connected to the end cap 11 at the front end of the cylinder 1 via a pipe (e.g., an insulated pipe). Preferably, the hot air inlet is located on the end cap 11, close to the central axis of the cylinder 1, so that the hot air can enter the interior of the cylinder 1 more evenly. The temperature of the hot air generated by the hot air blower 4 can be adjusted according to the characteristics of the raw material (such as bentonite) and process requirements, for example, controlled within the range of 120°C to 250°C. The motor 5 serves as the drive source, preferably a speed-regulating motor (such as a variable frequency motor) to adapt to the speed requirements of different materials and drying stages. Those skilled in the art can make reasonable selections to match different drying specifications according to actual conditions. The motor 5 is rigidly connected to the scraper 6 (e.g., via a key connection, coupling, or direct welding / flange connection), driving the scraper 6 to rotate within the cylinder 1.

[0023] The scraper section 6 is a key component that prevents wet materials (especially highly viscous bentonite) from adhering and clumping on the inner wall of the cylinder and promotes material agitation and heat exchange. The scraper section 6 specifically includes the following components: a rotating shaft 61, connecting plates 62, scrapers 63, and a support member 64. The rotating shaft 61 is the core transmission component; one end passes through the sealing device of the end cap 11 and connects to the output end of the motor 5, while the other end extends into the cylinder 1 near the rear end. The rotating shaft 61 is supported by bearings (not shown in the figure, preferably high-temperature resistant bearings) on the end cap 11 and can rotate relative to the end cap 11. Multiple connecting plates 62 are equidistantly spaced vertically along the length of the rotating shaft 61 (e.g., spacing of 300mm to 800mm). These connecting plates 62 are rigidly fixed to the rotating shaft 61 (e.g., welded or bolted) and extend radially outward. The number and spacing of the connecting plates 62 can be adjusted according to the cylinder length and material characteristics. Each connecting plate 62 has one or more scrapers 63 at its end (i.e., the end furthest from the rotating shaft 61). The scraper 63, at its end away from the connecting plate 62 (i.e., its working edge), maintains contact with or a very small gap (e.g., less than 5 mm) with the inner wall of the straight section 12, ensuring effective scraping of material adhering to the inner wall. The scraper 63 is preferably made of wear-resistant material (such as wear-resistant alloy steel or ceramic-coated steel plate). A support member 64 is located at the other end of the rotating shaft 61 (away from the motor end) to provide radial support to the end of the rotating shaft 61, reducing vibration and deflection during high-speed rotation. The lower end of the support member 64 (e.g., via a bearing or bushing) is rotatably connected to the end of the rotating shaft 61. The upper end of the support member 64 (e.g., via welding, bolts, or brackets) is fixed to the inner wall of the straight section 12. The support member 64 can be in the form of a cross support, a star support, or a pillar with a bearing seat, etc.

[0024] Specifically, the cross-section of scraper 63 (the section along the axial direction of cylinder 1) is curved in the direction of its rotation (e.g., a curved surface similar to a plowshare or spoon). This curved design helps to throw the material forward (towards the discharge end) and upward (towards the center of the cylinder) while scraping it off, increasing the contact area and mixing degree between the material and the hot air, and improving drying efficiency.

[0025] Specifically, the total area swept by several scrapers 63 during rotation is greater than the area of ​​the inner wall of the straight section 12. The total area swept by all the installed scrapers 63 during rotation is greater than the area of ​​the inner wall of the straight section 12. This means that when the scrapers 63 rotate, their trajectory can cover the entire inner wall of the cylinder, and there are no "dead zones" that are not scraped, ensuring that the inner wall is always effectively cleaned.

[0026] Specifically, the scraper 63 is an isosceles trapezoid. The narrower end of the trapezoid is close to the rotating shaft 61, and the wider end (i.e., the working blade end) contacts the cylinder wall. This shape provides good structural strength and scraping area.

[0027] The working principle of this utility model:

[0028] Wet pellet binder raw materials (such as bentonite) are continuously fed into the inclined cylinder 1 through the feed hopper 2. A hot air blower 4 delivers hot air to the front end of the cylinder 1. A motor 5 drives the scraper unit 6 (rotating shaft 61, connecting plate 62, scraper 63) to rotate inside the cylinder 1. The rotating scraper 63 continuously scrapes away the wet material adhering to the cylinder wall to prevent clumping; on the other hand, its curved cross-sectional shape throws, disperses, and propels the material forward, ensuring that the material particles are fully exposed to the hot air, achieving efficient heat and mass transfer. The dried material is finally discharged from the discharge hopper 3 at the rear end. Exhaust gas containing moisture is extracted from the middle and rear ends of the cylinder by an induced draft fan 7.

[0029] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A pellet binder raw material drying device, comprising a cylinder (1), a feed hopper (2) located at the upper front end of the cylinder (1), and a discharge hopper (3) located at the lower rear end of the cylinder (1), characterized in that: It also includes a hot air blower (4), a motor (5), a wall scraper (6), and an exhaust fan (7); the hot air blower (4) is connected to the end cap (11) at the front end of the cylinder (1) through a pipe; the motor (5) is detachably connected to the middle of the end cap (11), and the output end of the motor (5) is fixedly connected to the wall scraper (6) extending out of the cylinder (1); the middle and rear ends of the straight section (12) of the cylinder (1) are connected to the exhaust fan (7) through pipes.

2. The pellet binder raw material drying apparatus according to claim 1, characterized in that: The scraping section (6) includes a rotating shaft (61), a connecting plate (62), a scraper (63), and a support member (64); one end of the rotating shaft (61) extends out of the end cap (11) and can rotate relative to the end cap (11); the other end of the rotating shaft (61) is rotatably connected to the lower end of the support member (64); the upper end of the support member (64) is fixedly connected to the inner wall of the straight section (12); several connecting plates (62) are equally spaced on the rotating shaft (61); a scraper (63) is provided at the end of the connecting plate (62); the end of the scraper (63) away from the connecting plate (62) is in contact with the inner wall of the straight section (12).

3. The pellet binder raw material drying device according to claim 2, characterized in that: The cross-section of the scraper (63) is curved in the direction of rotation.

4. The pellet binder raw material drying device according to claim 2, characterized in that: The total area swept by the rotating scrapers (63) of several of them is greater than the inner wall area of ​​the straight section (12).

5. The pellet binder raw material drying apparatus according to claim 2, characterized in that: The scraper (63) is projected in the shape of an isosceles trapezoid.

6. The pellet binder raw material drying apparatus according to any one of claims 1 to 5, characterized in that: The central axis of the cylinder (1) forms an angle of 10° to 15° with the horizontal line.

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