A fixing structure for the return air pipe of an indirect dryer

Abstract

The present invention relates to the technical field of support mechanisms, and specifically to a return air pipe fixing structure for an indirect dryer. The present invention provides an indirect dryer return air pipe fixing structure, which is arranged in the cylinder of the indirect dryer and is used to support the return air pipe. The cylinder includes an inner cylinder and an outer cylinder arranged coaxially; the return air pipe is cylindrical, and the return air pipe is located between the inner cylinder and the outer cylinder; the return air pipe fixing structure for the indirect dryer includes a support plate group, and the support plate group includes a first fixed plate and a second fixed plate, the first fixed plate and the second fixed plate are respectively installed on the outer cylinder and the inner cylinder, and the first fixed plate and the second fixed plate are respectively provided with a first support sleeve and a second support sleeve, and the first support sleeve and the second support sleeve are respectively semi-surrounded by the outer circumference of the return air pipe. The present invention facilitates the installation and disassembly of the support assembly by setting the support assembly to be split, and has high working efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of supporting mechanisms, and in particular to a fixing structure for an air return pipe of an indirect dryer. Background Art

[0002] The wet titanium concentrate produced at Panzhihua Iron and Steel's titanium concentrator plant is directly dried using a mixture of coal gas and heated air. Since the high-temperature flue gas, typically exceeding 800°C, comes into direct contact with the titanium concentrate during drying, causing the phosphorus, sulfur, and flotation agents in the concentrate to combust or volatilize, generating harmful gases. This not only pollutes the environment but also significantly impacts the lives of surrounding residents. To fully utilize the titanium smelter's coal gas resources and address environmental concerns associated with the drying line at the Panzhihua Iron and Steel plant, an indirect dryer utilizes a fully enclosed process to dry the wet titanium concentrate. A typical indirect dryer consists of a slightly tilted, rotating cylinder with a return air duct inside. Saturated, high-temperature gas is introduced into the duct. Once the wet material enters the cylinder, it enters the upper end and exits the lower end under gravity, exchanging heat with the return air duct as it moves, completing the drying process. The dried material is then discharged through the discharge port. The return air duct is a key component to ensure the sealing effect of the dryer. The original fixing method of the return air duct was a complete set of flower plate hole structure, and the flower plate hole position was prone to material accumulation and corrosion.

[0003] The utility model patent with authorization announcement number CN206739800U provides a rotary steam dryer, including a cylinder, two wheel belts sleeved on the cylinder, a large gear, a supporting wheel device, a blocking wheel device, and a driving device. It also includes a heat exchange tube, a support plate, a cleaning device, and a steam separation chamber. The heat exchange tube is arranged inside the cylinder, and the heat exchange tube is arranged along the radial circumference of the cylinder and the two ends extend longitudinally along the axis of the cylinder. The middle of the heat exchange tube passes through the support plate and the two ends are respectively connected to the exhaust gas pipe and the steam separation chamber. The support plates are arranged in multiple rows along the axial direction of the cylinder. Each row of support plates is arranged along the circumference of the cylinder and fixed on the inner wall of the cylinder. The cleaning device is fixed between two adjacent rows of support plates, and the steam separation chamber is fixed to the tail of the cylinder by bolts. In the aforementioned rotary steam dryer, a cleaning device is provided to continuously vibrate and clean wet and sticky materials and heat exchange tubes as the cylinder rotates, thereby breaking up and preventing blockage. However, this method still cannot prevent the location of the flower plate holes on the support plate from being corroded by accumulated materials. Furthermore, since multiple heat exchange tubes are fixedly mounted on the support plate, each time the flower plate holes are inspected, the heat exchange tubes and support plate must be removed simultaneously. This is difficult to disassemble and install, consuming a lot of manpower and material resources, and seriously affecting the operating efficiency of the indirect dryer. Therefore, the existing technology still needs to be improved. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention proposes a fixing structure for an air return duct of an indirect dryer to solve the problem that it is difficult to clean the accumulated matter in the air return duct of the prior indirect dryer.

[0005] The present invention provides a return air duct fixing structure for an indirect dryer, which is arranged in the cylinder of the indirect dryer and is used to support the return air duct, wherein the cylinder includes an inner cylinder and an outer cylinder arranged coaxially; the return air duct is cylindrical and is located between the inner cylinder and the outer cylinder; the return air duct fixing structure for the indirect dryer includes a support plate group, which includes a first fixing plate and a second fixing plate, which are respectively installed on the outer cylinder and the inner cylinder, and the first fixing plate and the second fixing plate are respectively provided with a first support sleeve and a second support sleeve, which respectively semi-surround the outer periphery of the return air duct.

[0006] Furthermore, a discharge hole is provided on the first fixed plate.

[0007] Furthermore, the hole wall of the discharge hole extends to the outer cylinder.

[0008] Furthermore, there are multiple return air pipes, which are evenly distributed along the circumference of the inner tube and the outer tube. There are multiple support plate groups, which are seamlessly spliced ​​end to end around the circumference of the outer tube and the inner tube. The first fixed plate and the second fixed plate of each support plate group are seamlessly spliced.

[0009] Furthermore, the return air pipe is cylindrical, and the axis of the return air pipe is parallel to the axis of the cylinder; the projections of the first support sleeve and the second support sleeve on the axial direction of the cylinder are both arc-shaped, and the centers of the first support sleeve and the second support sleeve are on the axis of the return air pipe.

[0010] Furthermore, a plurality of first support sleeves may be provided on each first fixing plate, and a plurality of second support sleeves may be provided on each second fixing plate.

[0011] Furthermore, the lengths of the first supporting sleeve and the second supporting sleeve in the axial direction of the cylinder are greater than the thicknesses of the first fixing plate and the second fixing plate in the axial direction of the cylinder.

[0012] Furthermore, a plurality of support components seamlessly spliced ​​end to end serve as support rings, and there are a plurality of support rings, which are sequentially spaced apart along the axial direction of the cylinder.

[0013] Furthermore, bevel welding is performed between the first fixing plate and the outer tube, and between the second fixing plate and the inner tube; bevel welding is performed between the first fixing plate and the second fixing plate in the same support assembly, and between two adjacent support assemblies.

[0014] Furthermore, the joint surface of two adjacent support assemblies extends along the radial direction of the cylinder.

[0015] The beneficial effects of the present invention are as follows: the present invention facilitates the installation and disassembly of the support assembly by setting the support assembly to be split. Specifically, when inspecting the flower plate hole, it is only necessary to remove the first fixing plate and the second fixing plate at the corresponding position one by one, without removing the return air pipe passing through the flower plate hole at the same time. Compared with the traditional return air pipe being integrated into a complete support plate flower plate hole structure, the disassembly is simple, the operation is convenient, and the work efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram showing a support assembly of a fixed structure for an indirect dryer return air duct provided by the present invention;

[0017] Figure 2 The figure shows a structural diagram of the return air pipe fixing structure of the indirect dryer provided by the present invention.

[0018] Description of reference numerals:

[0019] 1. First fixed plate; 2. Discharge hole; 3. First support sleeve; 4. Second fixed plate; 5. Second support sleeve; 6. Return air pipe; 7. Cylinder. DETAILED DESCRIPTION

[0020] It should be understood that the embodiments of the present invention shown in the exemplary embodiments are merely illustrative. Although only a few embodiments have been described in detail in the present invention, it is readily apparent to those skilled in the art that various modifications are feasible without departing substantially from the teachings of the subject matter of the present invention. Accordingly, all such modifications should be included within the scope of the present invention. Without departing from the gist of the present invention, other replacements, modifications, variations, and deletions may be made to the design, operating conditions, and parameters of the following exemplary embodiments.

[0021] like Figure 1 and Figure 2As shown, an embodiment of the present invention provides an indirect dryer return air pipe fixing structure which is arranged in the cylinder 7 of the indirect dryer and is used to support the return air pipe 6. The cylinder 7 includes an inner cylinder and an outer cylinder arranged coaxially. The return air pipe 6 is cylindrical and is located between the inner cylinder and the outer cylinder. The two ends of the return air pipe 6 are fixed relative to the inner cylinder and the outer cylinder. The indirect dryer return air pipe fixing structure includes a support plate group, which includes a first fixed plate 1 and a second fixed plate 4. The first fixed plate 1 and the second fixed plate 4 are respectively installed on the outer cylinder and the inner cylinder. The first fixed plate 1 and the second fixed plate 4 are respectively provided with a first support sleeve 3 and a second support sleeve 5. A plate hole structure is formed between the first support sleeve 3 and the second support sleeve 5. The first support sleeve 3 and the second support sleeve 5 are respectively semi-surrounded by the outer periphery of the return air pipe 6 to support the return air pipe 6 and prevent the return air pipe 6 from moving relative to the cylinder 7. By installing the first fixing plate 1 and the second fixing plate 4 separately, when inspecting the flower plate hole, it is only necessary to remove the first fixing plate 1 and the second fixing plate 4 at the corresponding positions one by one, without removing the return air pipe 6 passing through the flower plate hole at the same time. Compared with the traditional return air pipe 6 being integrally mounted on a complete support plate flower plate hole structure, the disassembly is simple, the operation is convenient, and the work efficiency is improved.

[0022] In some embodiments, a discharge hole 2 is provided on the first fixed plate 1. The size and location of the discharge hole 2 are set according to actual needs to ensure that the material can be discharged from the discharge hole 2. Figure 2 As shown, the number of the discharge holes 2 provided in this embodiment is the same as the number of the return air pipes 6 , and each discharge hole 2 is located between two adjacent return air pipes 6 and on the side close to the outer cylinder.

[0023] In some embodiments, the wall of the discharge hole 2 extends to the outer cylinder. As the dryer dries wet material, it moves from the upper end to the lower end of the cylinder 7. The temperature is higher in the area near the return air pipe 6 and lower in the area away from the return air pipe 6. Therefore, the wet material farther from the return air pipe 6 has a higher humidity and is more likely to clump and adhere to the outer cylinder. By configuring the discharge hole 2 with a wall extending to the outer cylinder, the wet material near the cylinder 7 can be discharged, reducing its accumulation.

[0024] In some embodiments, there are multiple return air pipes 6, which are evenly distributed along the circumference of the inner cylinder and the outer cylinder. There are multiple support plate groups, which are seamlessly spliced ​​end to end around the circumference of the outer cylinder and the inner cylinder. The first fixing plate 1 and the second fixing plate 4 of each support plate group are seamlessly spliced ​​to prevent wet material from accumulating at the joints. Specifically, Figure 2 As shown, there are 22 return air pipes 6 and 11 support plate groups to improve the utilization rate of the dryer.

[0025] In some embodiments, the return air pipe 6 is cylindrical to reduce the adhesion of wet materials. The axial projections of the first support sleeve 3 and the second support sleeve 5 on the cylinder 7 are both arc-shaped, and the centers of the first support sleeve 3 and the second support sleeve 5 are located on the axis of the return air pipe 6 to adapt to the shape of the return air pipe 6.

[0026] In some embodiments, a plurality of first support sleeves 3 may be provided on each first fixing plate 1, and a plurality of second support sleeves 5 may be provided on each second fixing plate 4. Specifically, Figure 2 As shown, each support plate group supports two return air pipes 6, which can simultaneously clean the areas around the two flower plate holes without affecting the return air pipes 6. In particular, each support plate group can also be configured to simultaneously support three or four return air pipes 6, as long as it does not affect the disassembly of the first fixing plate 1 and the second fixing plate 4.

[0027] In some embodiments, the axial length of the first support sleeve 3 and the second support sleeve 5 in the cylinder 7 is greater than the axial thickness of the first fixing plate 1 and the second fixing plate 4 in the cylinder 7. By increasing the length of the first support sleeve 3 and the second support sleeve 5, the contact area with the return air pipe 6 is increased to reduce the local force friction of the return air pipe 6 and extend the service life of the return air pipe 6.

[0028] In some embodiments, a plurality of support components seamlessly spliced ​​end to end are used as support rings. There are multiple support rings, and the multiple support rings are arranged in sequence along the axial direction of the cylinder 7 at intervals to improve the support effect on the return air pipe 6.

[0029] In some embodiments, the first fixing plate 1 and the outer cylinder and the second fixing plate 4 and the inner cylinder are welded with beveled grooves; the first fixing plate 1 and the second fixing plate 4 in the same support assembly, as well as the two adjacent support assemblies are welded with beveled grooves; specifically, the first fixing plate 1 and the second fixing plate 4 are both made of Mn16 material, so that the support assembly is firmly installed between the outer cylinder and the inner cylinder.

[0030] In some embodiments, the joint surface of two adjacent support assemblies extends along the radial direction of the cylinder 7 to facilitate the removal of the disassembled first fixing plate 1 and the second fixing plate 4.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. If the present invention is modified or replaced with equivalents without departing from the spirit and scope of the present invention, it should be included in the scope of protection of the claims of the present invention.

Claims

1. An indirect dryer return air pipe fixing structure, characterized in that: It is arranged in the cylinder of the indirect dryer for supporting the return air pipe, and the cylinder includes an inner cylinder and an outer cylinder arranged coaxially; the return air pipe is cylindrical, and the return air pipe is located between the inner cylinder and the outer cylinder; the return air pipe fixing structure of the indirect dryer includes a support plate group, the support plate group includes a first fixing plate and a second fixing plate, the first fixing plate and the second fixing plate are respectively installed on the outer cylinder and the inner cylinder, and the first fixing plate and the second fixing plate are respectively provided with a first support sleeve and a second support sleeve, and the first support sleeve and the second support sleeve are respectively semi-surrounded by the outer circumference of the return air pipe; a discharge hole is provided on the first fixing plate, and the hole wall of the discharge hole extends to the outer cylinder; there are multiple return air pipes, and the multiple return air pipes are evenly distributed along the circumference of the inner cylinder and the outer cylinder, and there are multiple support plate groups, and the multiple support plate groups are seamlessly spliced ​​end to end around the circumference of the outer cylinder and the inner cylinder, and the first fixing plate and the second fixing plate of each support plate group are seamlessly spliced.

2. The indirect dryer return air pipe fixing structure according to claim 1, characterized in that: The return air pipe is cylindrical, and the axis of the return air pipe is parallel to the axis of the cylinder; the projections of the first support sleeve and the second support sleeve in the axial direction of the cylinder are both arc-shaped, and the centers of the first support sleeve and the second support sleeve are on the axis of the return air pipe.

3. The indirect dryer return air pipe fixing structure according to claim 1, characterized in that: A plurality of first support sleeves may be provided on each first fixing plate, and a plurality of second support sleeves may be provided on each second fixing plate.

4. The indirect dryer return air pipe fixing structure according to claim 1, characterized in that: The lengths of the first support sleeve and the second support sleeve in the axial direction of the cylinder are greater than the thicknesses of the first fixing plate and the second fixing plate in the axial direction of the cylinder.

5. The indirect dryer return air pipe fixing structure according to claim 1, characterized in that: A plurality of support plate groups seamlessly spliced ​​end to end are used as support rings. There are a plurality of support rings, and the plurality of support rings are sequentially spaced along the axial direction of the cylinder.

6. The indirect dryer return air pipe fixing structure according to claim 1, characterized in that: The first fixing plate and the outer tube and the second fixing plate and the inner tube are welded by bevel welding; the first fixing plate and the second fixing plate in the same support plate group and the two adjacent support plate groups are welded by bevel welding.

7. The indirect dryer return air pipe fixing structure according to claim 1, characterized in that: The joint surface of two adjacent support plate groups extends along the radial direction of the cylinder.

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