Three-section rotary kiln

Abstract

A three-section rotary kiln comprises a feeding rotary cylinder, a fixed-section cylinder and a discharging rotary cylinder which are sequentially arranged in the axial direction, the feeding rotary cylinder and the discharging rotary cylinder can rotate respectively, the fixed-section cylinder is installed on a supporting device to form a three-section rotary kiln structure, and the fixed-section cylinder can introduce high-temperature flue gas and supplement heat of a cold end. The position of the air inlet is fixed by adding the fixing section, and the combustion device or the air inlet does not need to rotate along with the barrel, so that the sealing difficulty and cost are reduced, and meanwhile, the heat utilization efficiency and the material movement smoothness are improved. A material receiving groove and a material pushing device are arranged in the fixed section cylinder body, the material pushing device moves front and back to push materials, the materials are continuously pushed out of the material receiving groove, and then the movement speed of the materials after the materials enter the discharging rotary cylinder body is increased through a spiral lining of the discharging rotary cylinder body. Therefore, under the condition that the fixed section barrel is arranged, it is guaranteed that the materials can move towards the discharging end rapidly and smoothly, and the working efficiency of the rotary kiln is improved.

Description

Technical Field

[0001] This invention relates to the field of rotary kilns for metal smelting, and more particularly to a three-stage rotary kiln. Background Technology

[0002] Rotary kilns are commonly used equipment in metal smelting, used for processes such as heating, roasting, and reduction of materials. Traditional rotary kilns are typically single- or double-stage structures, which suffer from uneven heat distribution and impeded material movement. This is especially true for longer rotary kilns, where the heat generated by the burner at the discharge end is insufficient to cover the feed end, leading to uneven heat distribution and impacting production efficiency and product quality. To address this issue, burners or air inlets are usually added to the middle section of the kiln. However, due to the kiln's rotation, the combustion device or air inlet also needs to rotate with the kiln, increasing sealing difficulty and cost. Furthermore, significant heat loss occurs during material transfer and reheating, consuming considerable manpower and resources. Summary of the Invention

[0003] The purpose of this invention is to provide a three-section rotary kiln, which fixes the position of the air inlet by adding a fixed section, so that the combustion device or air inlet does not have to rotate with the cylinder, thereby reducing the difficulty and cost of sealing, while improving the heat utilization efficiency and the smoothness of material movement.

[0004] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a three-section rotary kiln, comprising a feeding rotary cylinder, a fixed section cylinder, and a discharging rotary cylinder arranged sequentially along the axial direction. The feeding rotary cylinder and the discharging rotary cylinder are respectively mounted on a transmission device, and can be driven independently by their respective drive devices. The discharge end of the feeding rotary cylinder and the feed end of the discharging rotary cylinder extend into the axial openings on both sides of the fixed section cylinder and are sealed by a sealing device. The side wall of the fixed section cylinder has an air inlet for introducing high-temperature flue gas. A receiving groove is provided inside the fixed section cylinder. One side of the receiving groove is located below the discharge end of the feeding rotary cylinder, and the other side of the receiving groove is located above the feed end of the discharging rotary cylinder. A pushing device is provided inside the receiving groove. The pushing device can reciprocate in the receiving groove and push the material to fall to the feed end of the discharging rotary cylinder. The discharging rotary cylinder can drive the material falling from the receiving groove toward the discharge end.

[0005] Preferably, the transmission device is an idler roller, and the drive device is a motor. Preferably, the pushing device includes a push rod and a push plate.

[0006] Preferably, a return scoop is installed at the feed end of the discharge rotary cylinder.

[0007] According to the above technical solution, the beneficial effects of the present invention are: This invention addresses the issue of existing rotary kiln structures where all sections of the kiln rotate. It adds a stationary section in the middle that does not rotate, creating a three-section rotary kiln structure. The stationary section allows for the introduction of high-temperature flue gas to supplement the heat at the cold end. By adding the stationary section, the air inlet position is fixed, eliminating the need for the combustion device or air inlet to rotate with the kiln, thus reducing sealing difficulty and cost, while improving heat utilization efficiency and material movement smoothness. Furthermore, to prevent material accumulation within the stationary section, a receiving trough and a pushing device are installed inside. The pushing device moves back and forth, continuously pushing the material out of the receiving trough. This ensures that the material can move quickly and smoothly towards the discharge end even with the stationary section, improving the rotary kiln's operating efficiency. Attached Figure Description

[0008] Figure 1 This is a partial cross-sectional view of the present invention.

[0009] The markings in the diagram are: 1. Feeding rotary cylinder, 2. Fixed section cylinder, 3. Discharge rotary cylinder, 4. Receiving trough, 5. Push rod, 6. Push plate, 7. Return scoop. Detailed Implementation

[0010] Referring to the attached diagram, the specific implementation method is as follows: A three-section rotary kiln includes a feed rotary cylinder 1, a fixed section cylinder 2, and a discharge rotary cylinder 3 arranged sequentially along the axial direction. The feed rotary cylinder 1 and the discharge rotary cylinder 3 are respectively mounted on a transmission device, which is typically a roller. Each section is driven by a motor, enabling the feed rotary cylinder 1 and the discharge rotary cylinder 3 to rotate independently. The rotary kiln as a whole has a certain inclination, allowing the material to move from high to low under the influence of gravity.

[0011] The fixed section of the cylinder 2 can be installed on a support device, such as... Figure 1 As shown, the discharge end of the feed rotary cylinder 1 and the feed end of the discharge rotary cylinder 3 extend into the axial openings on both sides of the fixed section cylinder 2, and are sealed by a sealing device. The side wall of the fixed section cylinder 2 has an air inlet for introducing high-temperature flue gas. The high-temperature flue gas exchanges heat with the material, supplementing the heat at the cold end. Because the air inlet position is fixed, the combustion device or air inlet does not need to rotate with the cylinder, thus reducing sealing difficulty and cost, while improving heat utilization efficiency and material movement smoothness.

[0012] like Figure 1As shown, a receiving groove 4 is provided inside the fixed section cylinder 2. One side of the receiving groove 4 is located below the discharge end of the feeding rotary cylinder 1, and the other side of the receiving groove 4 is located above the feeding end of the discharge rotary cylinder 3. A pushing device is provided inside the receiving groove 4. The pushing device includes a push rod 5 and a push plate 6. The push rod 5 is driven by a motor or hydraulic cylinder, which can drive the push plate 6 to reciprocate within the receiving groove 4 and push the material that falls from the feeding rotary cylinder 1 to one side of the receiving groove 4 to fall out from the other side, thus preventing the material from accumulating inside the fixed section cylinder 2.

[0013] like Figure 1 As shown, a return scoop 7 is installed at the feed end of the discharge rotary cylinder 3. The return scoop 7 can prevent material leakage. The discharge rotary cylinder 3 can also be equipped with a spiral lining structure, which drives the material falling from the receiving trough 4 into the discharge rotary cylinder 3 to move towards the discharge end of the discharge rotary cylinder 3, thereby increasing the movement speed of the material after entering the discharge rotary cylinder 3. Thus, with the fixed section cylinder 2 set, the material can move quickly and smoothly to the discharge end, avoiding material accumulation and improving the working efficiency of the rotary kiln. The three-section design of this embodiment has clear functions for each section and is convenient for operation and maintenance.

Claims

1. A three-stage rotary kiln characterized by: The device comprises a feeding rotary cylinder (1), a fixed section cylinder (2) and a discharging rotary cylinder (3) arranged in sequence along the axial direction, the feeding rotary cylinder (1) and the discharging rotary cylinder (3) are respectively installed on a transmission device, the feeding rotary cylinder (1) and the discharging rotary cylinder (3) can be independently rotated through respective driving devices, the discharging end of the feeding rotary cylinder (1) and the feeding end of the discharging rotary cylinder (3) respectively extend into the axial two side openings of the fixed section cylinder (2) and are sealed through sealing devices, the sidewall of the fixed section cylinder (2) is provided with an air inlet for introducing high-temperature flue gas, the fixed section cylinder (2) is provided with a receiving groove (4), one side of the receiving groove (4) is located below the discharging end of the feeding rotary cylinder (1), the other side of the receiving groove (4) is located above the feeding end of the discharging rotary cylinder (3), the receiving groove (4) is provided with a pushing device, the pushing device can reciprocate in the receiving groove (4) and push the materials to fall to the feeding end of the discharging rotary cylinder (3), and the discharging rotary cylinder (3) can drive the materials falling from the receiving groove (4) to move towards the discharging end.

2. A three-stage rotary kiln according to claim 1, characterised in that: The transmission device is a carrier roller, and the driving device is a motor.

3. A three-stage rotary kiln according to claim 1, characterized in that: The pushing device comprises a push rod (5) and a push plate (6).

4. A three-stage rotary kiln according to claim 1, characterized in that: The feeding end of the discharging rotary cylinder (3) is provided with a material returning spoon (7).

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