Belt type circulation dryer

Abstract

The utility model relates to a belt type circulation dryer which comprises a drying box, the interior of the drying box is divided into a heat exchange chamber, a drying chamber and a backflow chamber through an L-shaped baffle and a plurality of partition plates, and a plurality of ventilation holes are formed in the top of the L-shaped baffle; an upper mesh belt conveyor, a lower mesh belt conveyor, an upper hopper, a guide hopper, a first cross-flow fan, an air duct type electric heater, a second cross-flow fan and a guide plate are installed in the drying box, and the upper mesh belt conveyor and the lower mesh belt conveyor penetrate through the heat exchange chamber and the drying chamber. The drying device has the advantages that materials on the feeding end of the upper mesh belt conveyor are preheated through heat exchange, the initial temperature of the materials entering the drying chamber is increased, the materials can quickly reach the moisture evaporation temperature in the drying chamber to be dried, heat loss of the materials on the discharging end of the lower mesh belt conveyor is reduced, and energy conservation and consumption reduction are facilitated.

Description

Technical Field

[0001] This utility model relates to the field of dryers, and more particularly to a belt circulating dryer. Background Technology

[0002] Belt-type circulating dryers utilize a conveyor belt to transport materials through a drying chamber with circulating hot air. The hot air passes through the moving materials, carrying away moisture and thus drying them. However, the dried materials, due to their high temperature, need to be cooled before subsequent production processes. This heat is generally wasted, resulting in energy loss and hindering energy conservation and consumption reduction. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned problems existing in the prior art and to provide a belt circulating dryer.

[0004] To achieve the above-mentioned technical objectives and effects, this utility model is implemented through the following technical solution:

[0005] A belt-type circulating dryer includes a drying chamber. The drying chamber is divided into a heat exchange chamber, a drying chamber, and a reflux chamber by an L-shaped baffle and multiple partitions. The top of the L-shaped baffle has several evenly distributed ventilation holes. A vertically parallel upper and lower mesh belt conveyor and a lower mesh belt conveyor are installed in the drying chamber, passing through the heat exchange chamber and the drying chamber. A feeding hopper is provided above the feeding end of the upper mesh belt conveyor, and a guide hopper is provided between the feeding end of the upper mesh belt conveyor and the feeding end of the lower mesh belt conveyor. A first cross-flow fan and a duct-type electric heater are installed at the junction of the bottom of the drying chamber and the bottom of the reflux chamber. The duct-type electric heater is located at the outlet of the first cross-flow fan. A second cross-flow fan is installed between the feeding end of the upper mesh belt conveyor and the feeding end of the lower mesh belt conveyor. A guide plate is installed between the inlet and outlet of the second cross-flow fan, separating the heat exchange chamber vertically.

[0006] The lower mesh belt conveyor is provided with multiple sets of evenly distributed first air guiding mechanisms. Each set of first air guiding mechanisms includes a steel wire mesh inclined at 45° and multiple vertically arranged guide plates. The bottom end of the guide plates is fixed to the steel wire mesh.

[0007] The air inlet of the first cross-flow fan faces the bottom of the return chamber, and the air outlet of the first cross-flow fan faces the bottom of the drying chamber.

[0008] The height difference between two adjacent guide vanes is equal to or greater than the height of the guide vanes.

[0009] The material guide plate is provided with a second air guiding mechanism above it. The second air guiding mechanism consists of N parallel air guiding plates. Each air guiding plate is tilted at 30° away from the second cross-flow fan. The tops of the N air guiding plates are at the same height, and the bottoms of the N air guiding plates gradually decrease from the side closer to the second cross-flow fan to the side away from the second cross-flow fan.

[0010] The lower mesh belt conveyor is provided with a discharge chute below the discharge end.

[0011] The drying chamber has an upper inspection port for cleaning powder from the guide plate and a lower inspection port for cleaning powder from the bottom of the drying chamber on one side. The drying chamber also has an upper inspection cover for covering the upper inspection port and a lower inspection cover for covering the lower inspection port on the side.

[0012] The top of the drying box near the feeding hopper is equipped with a residual gas discharge pipe that is connected to the reflux chamber.

[0013] The drying chamber below the heat exchange chamber is equipped with an air inlet, and a filter cloth for filtering dust in the air is installed at the bottom of the air inlet.

[0014] The beneficial effects of this utility model are as follows: A heat exchange chamber and a second cross-flow fan are provided. The second cross-flow fan draws in air to remove heat from the material at the unloading end of the lower mesh belt conveyor. Then, the air containing the absorbed heat is blown through the outlet of the second cross-flow fan to the loading end of the upper mesh belt conveyor. This preheats the material at the loading end of the upper mesh belt conveyor through heat exchange, increasing the initial temperature of the material entering the drying chamber. This facilitates the material to quickly reach the moisture evaporation temperature for drying in the drying chamber, reducing heat loss from the material at the unloading end of the lower mesh belt conveyor, and contributing to energy conservation and consumption reduction. Attached Figure Description

[0015] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0016] Figure 1 This is a three-dimensional structural diagram of the belt circulating dryer in this utility model;

[0017] Figure 2 This is a three-dimensional structural diagram of the belt circulation dryer with the upper and lower inspection covers open in this utility model.

[0018] Figure 3 This is a three-dimensional structural diagram of the belt circulating dryer after one side has been removed;

[0019] Figure 4This is a schematic diagram of the planar structure of the belt circulating dryer after one side has been removed;

[0020] The following are the labels in the diagram: 1. Drying box; 2. L-shaped baffle; 3. Partition; 4. Heat exchange chamber; 5. Drying chamber; 6. Return chamber; 7. Ventilation hole; 8. Upper mesh belt conveyor; 9. Lower mesh belt conveyor; 10. Feed hopper; 11. Guide hopper; 12. First cross-flow fan; 13. Duct-type electric heater; 14. Second cross-flow fan; 15. Guide plate; 16. First air guide mechanism; 17. Wire mesh; 18. Guide plate; 19. Air guide plate; 20. Discharge chute; 21. Upper inspection port; 22. Lower inspection port; 23. Upper inspection cover; 24. Lower inspection cover; 25. Residual gas discharge pipe; 26. Air inlet; 27. Filter cloth. Detailed Implementation

[0021] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] like Figures 1 to 4 As shown, a belt-type circulating dryer includes a drying chamber 1. The drying chamber 1 is divided into a heat exchange chamber 4, a drying chamber 5, and a reflux chamber 6 by an L-shaped baffle 2 and multiple partitions 3. The top of the L-shaped baffle 2 is provided with several evenly distributed ventilation holes 7. An air inlet 26 is provided on the drying chamber 1 below the heat exchange chamber 4. A filter cloth 27 for filtering dust in the air is installed at the bottom of the air inlet 26.

[0023] The drying chamber 1 is equipped with an upper and lower parallel mesh belt conveyor 8 and a lower mesh belt conveyor 9. The upper mesh belt conveyor 8 and the lower mesh belt conveyor 9 pass through the heat exchange chamber 4 and the drying chamber 5, and the feeding end of the upper mesh belt conveyor 8 and the unloading end of the lower mesh belt conveyor 9 are located in the heat exchange chamber 4.

[0024] A feeding hopper 10 is provided above the feeding end of the upper mesh belt conveyor 8. A guide hopper 11 is provided between the feeding end of the upper mesh belt conveyor 8 and the feeding end of the lower mesh belt conveyor 9. A discharge chute 20 is provided below the feeding end of the lower mesh belt conveyor 9. A residual gas discharge pipe 25 connected to the return chamber 6 is provided at the top of the drying box 1 near the feeding hopper 10.

[0025] A first cross-flow fan 12 and a duct-type electric heater 13 are installed at the junction of the bottom of the drying chamber 5 and the bottom of the return chamber 6. The duct-type electric heater 13 is located at the air outlet of the first cross-flow fan 12. The air inlet of the first cross-flow fan 12 faces the bottom of the return chamber 6, and the air outlet of the first cross-flow fan 12 faces the bottom of the drying chamber 5.

[0026] Below the lower mesh belt conveyor 9, there are multiple sets of evenly distributed first air guiding mechanisms 16. Each set of first air guiding mechanisms 16 includes a wire mesh 17 inclined at 45° and multiple vertically arranged guide plates 18. The bottom end of the guide plate 18 is fixed to the wire mesh 17.

[0027] In this embodiment, the height difference between two adjacent guide plates 18 is equal to the height of the guide plate 18.

[0028] In addition, the height difference between two adjacent guide vanes 18 can be greater than the height of the guide vane 18, depending on the specific situation.

[0029] A second cross-flow fan 14 is installed between the feeding end of the upper mesh belt conveyor 8 and the unloading end of the lower mesh belt conveyor 9. A guide plate 15 is installed between the air inlet and the air outlet of the second cross-flow fan 14 to separate the heat exchange chamber 4 vertically.

[0030] A second air guiding mechanism is provided above the guide plate 15. The second air guiding mechanism consists of N parallel air guiding plates 19. Each air guiding plate 19 is tilted at 30° away from the second cross-flow fan 14. The tops of the N air guiding plates 19 are at the same height, and the bottoms of the N air guiding plates 19 are lowered one by one from the side closer to the second cross-flow fan 14 to the side away from the second cross-flow fan 14.

[0031] The drying chamber 1 is provided with an upper inspection port 21 for cleaning powder on the guide plate 15 and a lower inspection port 22 for cleaning powder at the bottom of the drying chamber 1 on one side. The drying chamber 1 is also provided with an upper inspection cover 23 for covering the upper inspection port and a lower inspection cover 24 for covering the lower inspection port on the side.

[0032] The material loaded in the hopper gradually falls onto the mesh belt conveyor, which transports the material from the heat exchange chamber to the drying chamber. Then, it falls through the guide hopper to the feeding end of the lower mesh belt conveyor, which transports the material from the drying chamber to the heat exchange chamber, and finally discharges the material onto the discharge chute.

[0033] The operation of the first cross-flow fan blows air out of its outlet. After being heated by an electric heater, the air is guided upward by multiple sets of first air guide mechanisms. The hot air flows from bottom to top through the lower material conveyor and the upper material conveyor and then returns to the return chamber. The hot air dries the materials on the lower and upper material conveyors.

[0034] The second cross-flow fan draws in air to remove heat from the material at the unloading end of the lower mesh belt conveyor. Then, the heated air is blown through the fan's outlet to the loading end of the upper mesh belt conveyor. This heat exchange preheats the material at the loading end, increasing its initial temperature before it enters the drying chamber. This allows the material to quickly reach its moisture evaporation temperature and dry properly, reducing heat loss from the material at the unloading end of the lower mesh belt conveyor and contributing to energy conservation and emission reduction.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A belt-type circulating dryer, characterized in that: The device includes a drying chamber, which is divided into a heat exchange chamber, a drying chamber, and a reflux chamber by L-shaped baffles and multiple partitions. The top of the L-shaped baffles has several evenly distributed ventilation holes. The drying chamber is equipped with a vertically parallel upper and lower mesh belt conveyor and a lower mesh belt conveyor, which run through the heat exchange chamber and the drying chamber. A feeding hopper is located above the feeding end of the upper mesh belt conveyor, and a guide hopper is located between the feeding end of the upper mesh belt conveyor and the feeding end of the lower mesh belt conveyor. A first cross-flow fan and a duct-type electric heater are installed at the junction of the bottom of the drying chamber and the bottom of the reflux chamber. The duct-type electric heater is located at the outlet of the first cross-flow fan. A second cross-flow fan is installed between the feeding end of the upper mesh belt conveyor and the feeding end of the lower mesh belt conveyor. A guide plate is installed between the inlet and outlet of the second cross-flow fan to separate the upper and lower parts of the heat exchange chamber.

2. The belt circulating dryer according to claim 1, characterized in that: Below the lower mesh belt conveyor, there are multiple sets of evenly distributed first air guiding mechanisms. Each set of first air guiding mechanisms includes a steel wire mesh inclined at 45° and multiple vertically arranged guide plates. The bottom end of the guide plate is fixed to the steel wire mesh.

3. The belt circulating dryer according to claim 2, characterized in that: The air inlet of the first cross-flow fan faces the bottom of the return chamber, and the air outlet of the first cross-flow fan faces the bottom of the drying chamber.

4. The belt circulating dryer according to claim 2, characterized in that: The height difference between two adjacent guide vanes is equal to or greater than the height of the guide vanes.

5. The belt circulating dryer according to claim 1, characterized in that: A second air guiding mechanism is provided above the material guide plate. The second air guiding mechanism consists of N parallel air guiding plates. Each air guiding plate is tilted at 30° away from the second cross-flow fan. The tops of the N air guiding plates are at the same height, and the bottoms of the N air guiding plates gradually decrease from the side closer to the second cross-flow fan to the side away from the second cross-flow fan.

6. The belt circulating dryer according to claim 1, characterized in that: A discharge chute is provided below the discharge end of the lower mesh belt conveyor.

7. The belt circulating dryer according to claim 1, characterized in that: The drying chamber has an upper inspection port for cleaning powder from the guide plate and a lower inspection port for cleaning powder from the bottom of the drying chamber on one side. The drying chamber also has an upper inspection cover for covering the upper inspection port and a lower inspection cover for covering the lower inspection port on the side.

8. The belt circulating dryer according to claim 1, characterized in that: The top of the drying box near the feeding hopper is equipped with a residual gas discharge pipe that is connected to the reflux chamber.

9. The belt circulating dryer according to claim 1, characterized in that: An air inlet is provided on the drying box below the heat exchange chamber, and a filter cloth for filtering dust in the air is installed at the bottom of the air inlet.

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