Rake dryer

Abstract

The utility model discloses a rake dryer which comprises an inner cylinder and an outer cylinder which are coaxially arranged, the outer cylinder is fixedly arranged on a base, the inner cylinder is rotatably connected with the outer cylinder, one end of the inner cylinder extends outwards and is fixedly provided with a first rotating shaft, and the first rotating shaft is connected with a first power mechanism for controlling the first rotating shaft to rotate. The inner cylinder is coaxially provided with a second rotating shaft, the second rotating shaft is connected with the inner cylinder through a bearing, the second rotating shaft is connected with rake teeth, one end of the second rotating shaft extends to the outer end of the inner cylinder and is connected with a second power mechanism, and the outer cylinder is provided with a heat conduction oil inlet and a heat conduction oil outlet. A material inlet is formed in the top of the side end of the inner cylinder, a material outlet is formed in the bottom of the side end of the inner cylinder, the inner cylinder is of a rotatable structure, in the rake tooth rotating process, the inner cylinder rotates under the action of a first power mechanism at the same time, materials are prevented from being attached to the inner wall of the inner cylinder, and all-directional overturning of the materials is achieved; and the whole material drying effect is uniform.

Description

Technical Field

[0001] This utility model relates to drying equipment, and more particularly to a rake dryer. Background Technology

[0002] A rake dryer is a common drying device used to process slurries, pastes, or viscous materials, and is widely used in chemical, pharmaceutical, food, metallurgical, and environmental protection industries. Its working principle involves a rotating rake agitator bringing the material into contact with a heated surface, thereby accelerating moisture evaporation. The inner wall of the rake dryer is typically equipped with a heating plate or heating jacket, which transfers heat to the material via heat transfer oil, steam, or other heat sources. The rotating rake agitator continuously tumbles and stirs the material, ensuring uniform heating and increasing the contact area between the material and the heated surface.

[0003] Patent CN214172774U discloses a type of dryer, including a body with a rotating shaft inside. A motor and a heater are respectively arranged on both sides of the body. The motor has a motor shaft. One end of the rotating shaft inside the body is connected to the motor shaft, and the other end of the rotating shaft is connected to the end cover of the body. A rake rod is arranged on the rotating shaft. The heater is connected to the end cover. The heater is connected to a heating rod. The heating rod is located in the rotating shaft and connected to a heating core inside the rake rod. An air outlet is provided at the top of the body, and a support is provided at the bottom. Return springs are connected to both sides of the support at the bottom of the body. The return springs are sleeved in the lower limiting sleeve.

[0004] Although the rake dryer with the above structure can dry materials well, in order to avoid friction between the rake teeth and the dryer shell, there will be gaps between the rake teeth and the inner wall of the shell. This causes the material to easily stick to the inner wall of the shell, especially the material at the bottom wall of the shell. Not only is the material easy to stick, but the material in the gap between the bottom wall and the rake teeth cannot be turned over. Utility Model Content

[0005] Purpose of the invention: The purpose of this utility model is to provide a rake dryer with a rotatable inner cylinder. During the rotation of the rake teeth, the inner cylinder also rotates under the action of the first power mechanism, which prevents the material from sticking to the inner wall of the inner cylinder, realizes the all-round turning of the material, and achieves a uniform drying effect.

[0006] Technical solution:

[0007] A rake-type dryer includes an inner cylinder and an outer cylinder coaxially arranged. The outer cylinder is fixedly mounted on a base, and the inner cylinder is rotatably connected to the outer cylinder. A first rotating shaft is fixedly mounted on one end of the inner cylinder extending outward. The first rotating shaft is connected to a first power mechanism that controls its rotation. A second rotating shaft is coaxially arranged on the inner cylinder and connected to the inner cylinder via a bearing. The second rotating shaft is connected to rake teeth, and one end of the second rotating shaft extends to the outer end of the inner cylinder and is connected to a second power mechanism. The outer cylinder has a heat transfer oil inlet and a heat transfer oil outlet. The top side of the inner cylinder has a material inlet, and the bottom side of the inner cylinder has a material outlet. The rotation of the inner and outer cylinders, the stirring of the rake teeth, and the uniform flow of the heat transfer oil work together to greatly improve the heat transfer efficiency and the material agitation effect, thereby accelerating the moisture evaporation process and improving the drying efficiency.

[0008] Furthermore, the second rotating shaft is connected to rake teeth on both sides along the axial direction, and the rake teeth on both sides are staggered. The staggered design increases the contact surface of the material, thereby improving the uniformity of the drying effect.

[0009] Furthermore, both the first power mechanism and the second power mechanism are belt pulley power systems.

[0010] Furthermore, the first rotating shaft rotates in the opposite direction to the second rotating shaft.

[0011] Furthermore, the outer cylinder is provided with a first pressure relief port that communicates with the space between the inner cylinder and the outer cylinder. The first pressure relief port is provided to release the pressure generated between the inner cylinder and the outer cylinder due to thermal expansion or evaporation of moisture during the drying process.

[0012] Furthermore, the heat transfer oil inlet is located at the top of the outer cylinder, and the heat transfer oil outlet is located at the bottom of the outer cylinder, with the heat transfer oil inlet and outlet respectively located at both ends of the outer cylinder along its axial direction.

[0013] Furthermore, the outer cylinder is equipped with a guide plate that forms a meandering channel for the heat transfer oil to flow from the heat transfer oil inlet to the heat transfer oil outlet. This allows the heat transfer oil to flow along a specific path, ensuring that it forms a uniform meandering channel within the outer cylinder. The guide plate effectively guides the flow direction of the hot oil, allowing it to better cover the inner wall of the outer cylinder and evenly transfer heat to the inner cylinder.

[0014] Beneficial effects: The inner cylinder adopts a rotatable structure. During the rotation of the rake teeth, the inner cylinder also rotates under the action of the first power mechanism, which prevents the material from sticking to the inner wall of the inner cylinder, realizes the all-round turning of the material, and the overall drying effect of the material is uniform. Attached Figure Description

[0015] Figure 1 This is a three-dimensional representation of the present invention. Figure 1 ;

[0016] Figure 2 The three-dimensional representation of this utility model Figure 2 ;

[0017] Figure 3 This is a perspective perspective view of the present invention;

[0018] Figure 4 The internal structure of this utility model Figure 1 ;

[0019] Figure 5 The internal structure of this utility model Figure 2 . Detailed Implementation

[0020] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Example 1

[0022] like Figure 1-5 As shown, a rake dryer includes an inner cylinder 1 and an outer cylinder 2 coaxially arranged. The outer cylinder 2 is fixedly mounted on a base 3. The inner cylinder 1 and the outer cylinder 2 are rotatably connected. One end of the inner cylinder 1 extends outward and is fixedly mounted with a first rotating shaft 4. The first rotating shaft 4 is connected to a first power mechanism 6 that controls its rotation. The inner cylinder 1 is coaxially arranged with a second rotating shaft 8, which is connected to the inner cylinder 1 through a bearing. The second rotating shaft is connected with rake teeth 5. One end of the second rotating shaft extends to the outer end of the inner cylinder and is connected to a second power mechanism 9. The outer cylinder 2 has a heat transfer oil inlet 21 and a heat transfer oil outlet 22. The top side end of the inner cylinder 1 has a material inlet 11, and the bottom side end of the inner cylinder 1 has a material outlet 12.

[0023] Furthermore, the second rotating shaft 8 is connected to rake teeth 5 on both sides along its axis, and the rake teeth 5 on both sides are staggered. This ensures that the material is continuously turned over and stirred inside the dryer during the rotation of the rake teeth. This staggered design increases the contact surface of the material, preventing the material from accumulating or adhering to the inner wall of the equipment during stirring, avoiding the formation of dead zones, and thus improving the uniformity of the drying effect. In addition, this design can also effectively reduce the risk of material agglomeration, further improving the drying efficiency of the material.

[0024] Furthermore, both the first power mechanism 6 and the second power mechanism 9 are belt-driven power systems. Using belt-driven power systems as the first and second power mechanisms ensures smooth and synchronized rotation of the inner and outer cylinders and tumbling of the rake teeth while providing high rotational speeds. The belt-driven system offers strong adaptability and flexibility, making it easier to adjust the speed and transmission ratio, thus facilitating the adjustment of the rake dryer's operating state to meet the drying requirements of different materials. Simultaneously, the belt-driven system reduces mechanical wear and extends the equipment's service life.

[0025] Furthermore, the first rotating shaft 4 and the second rotating shaft 8 rotate in opposite directions. This counter-rotation helps optimize the mixing effect of the material. When the two shafts rotate in opposite directions, the material is more thoroughly agitated and stirred during the drying process, further enhancing the contact between the material and the heating surface and heating medium. The counter-rotation also helps reduce the deposition or adhesion of material inside the inner cylinder, ensuring uniformity and efficiency during the drying process.

[0026] Furthermore, the outer cylinder is provided with a first pressure relief port 7 that communicates with the space between the inner cylinder and the outer cylinder. This first pressure relief port is provided to release the pressure generated between the inner and outer cylinders due to thermal expansion or moisture evaporation during the drying process. The pressure relief port design prevents equipment malfunction due to excessive pressure, ensuring the safe operation of the dryer. In addition, the pressure relief port can reduce airflow resistance between the inner and outer cylinders, thereby making the drying process more efficient.

[0027] Furthermore, the heat transfer oil inlet 21 is located at the top of the outer cylinder, and the heat transfer oil outlet 22 is located at the bottom of the outer cylinder. The heat transfer oil inlet 21 and the heat transfer oil outlet 22 are respectively located at both ends of the outer cylinder in the axial direction.

[0028] Furthermore, the outer cylinder 2 is equipped with a guide plate 23 that forms a meandering channel for the heat transfer oil to flow from the heat transfer oil inlet 21 to the heat transfer oil outlet 22. This design allows the heat transfer oil to form a natural circulation path within the outer cylinder. During the drying process, heat enters from the top of the outer cylinder through the heat transfer oil and flows to the bottom through the meandering channel, thus maintaining a stable and uniform temperature distribution on the inner wall of the outer cylinder. The flow path design of the heat transfer oil improves heat transfer efficiency, ensuring more uniform heating of the inner cylinder and the material. In addition, since the heat transfer oil inlet and outlet are located at opposite ends of the axial direction, a more uniform temperature distribution can be formed throughout the outer cylinder, avoiding local overheating or insufficient heat. The guide plate inside the outer cylinder allows the heat transfer oil to flow along a specific path, ensuring the formation of a uniform meandering channel within the outer cylinder. The guide plate effectively guides the flow direction of the hot oil, allowing it to better cover the inner wall of the outer cylinder and uniformly transfer heat to the inner cylinder. This not only improves heat exchange efficiency but also avoids problems such as localized overheating or uneven cooling of hot oil, thereby improving the overall thermal efficiency of the dryer.

[0029] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A rake-type dryer, characterized in that, The device includes an inner cylinder (1) and an outer cylinder (2) arranged coaxially. The outer cylinder (2) is fixedly mounted on a base (3). The inner cylinder (1) and the outer cylinder (2) are rotatably connected. One end of the inner cylinder (1) extends outward and is fixedly mounted with a first rotating shaft (4). The first rotating shaft (4) is connected to a first power mechanism (6) that controls its rotation. The inner cylinder (1) is coaxially mounted with a second rotating shaft (8). The second rotating shaft (8) is connected to the inner cylinder (1) through a bearing. The second rotating shaft is connected with rake teeth (5). One end of the second rotating shaft extends to the outer end of the inner cylinder and is connected to a second power mechanism (9). The outer cylinder (2) has a heat transfer oil inlet (21) and a heat transfer oil outlet (22). The top of the side end of the inner cylinder (1) has a material inlet (11), and the bottom of the side end of the inner cylinder (1) has a material outlet (12).

2. The rake dryer according to claim 1, characterized in that, The second rotating shaft (8) has rake teeth (5) connected to both sides of its axial direction, and the rake teeth (5) on both sides are staggered.

3. A rake dryer according to claim 1, characterized in that, Both the first power mechanism (6) and the second power mechanism (9) are belt pulley power systems.

4. A rake dryer according to claim 1, characterized in that, The first rotating shaft (4) rotates in the opposite direction to the second rotating shaft (8).

5. A rake dryer according to claim 1, characterized in that, The outer cylinder is provided with a first pressure relief port (7) that communicates with the space between the inner cylinder and the outer cylinder.

6. A rake dryer according to claim 1, characterized in that, The heat transfer oil inlet (21) is located at the top of the outer cylinder, and the heat transfer oil outlet (22) is located at the bottom of the outer cylinder. The heat transfer oil inlet (21) and the heat transfer oil outlet (22) are respectively located at both ends of the outer cylinder in the axial direction.

7. A rake dryer according to claim 6, characterized in that, The outer cylinder (2) is provided with a guide plate (23) that forms a meandering channel for the heat transfer oil to flow from the heat transfer oil inlet (21) to the heat transfer oil outlet (22).

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