A rake dryer

Abstract

The application provides a rake dryer and belongs to the technical field of rake dryers. The rake dryer comprises a cylinder, a paddle is rotatable in the cylinder, a vacuum dust collector is arranged on the cylinder, a coarse filtering mechanism is arranged between the vacuum dust collector and the cylinder, the coarse filtering mechanism comprises an arc-shaped filter plate, a scraper is fixedly connected to the outer end of the paddle and is in sliding connection with the inner surface of the filter plate, and a needle plate is vertically movably arranged on the upper portion of the filter plate. The application has the following effects: the filter plate blocks the vacuum dust collector to perform preliminary filtering; the paddle drives the scraper to scrape off the material adsorbed on the surface of the filter plate; meanwhile, the movement of the scraper also lifts the needle plate through the roller, so that the needle rods on the needle plate move back and forth in the filter holes of the filter plate, thereby helping the material stuck in the filter holes to be separated, and thus, the coarse filtering mechanism can reduce the maintenance frequency of itself and also reduces the maintenance frequency of the vacuum dust collector.

Description

Technical Field

[0001] This application relates to the field of rake dryer technology, and more specifically, to a rake dryer. Background Technology

[0002] Rake-type vacuum dryers are widely used in the chemical and pharmaceutical industries for drying high-moisture slurries due to their characteristics of drying materials at low boiling points under vacuum and uniform heating caused by paddle stirring. They are key equipment for dehydrating and improving high-moisture materials.

[0003] In response, Chinese patent application number CN202020108707.5 discloses a multi-functional rake-type vacuum dryer. This design mainly uses a drive shaft with rake arms and rake blades welded onto them to form a double-helix structure on the drive shaft. This forces the rake blades to continuously tumble and mix, solving the problem of material agglomeration and clumping during the drying process. Vacuum treatment is also used to improve the drying effect. To prevent internal materials and dust from being sucked away, a dust collector is installed between the vacuum pipe and the cylinder.

[0004] However, in the process of implementing the technical solution in the embodiments of this application, the inventors of this application discovered that the above-mentioned technology has at least the following technical problems: When the blades rotate, they tend to lift the material up, and large pieces of material are easily adsorbed onto the filter screen, making them difficult to remove. This hinders the function of the filter screen, increases the frequency of maintenance of the vacuum dust collector, and affects its working efficiency. Utility Model Content

[0005] To overcome the above deficiencies, this application provides a rake dryer, which aims to improve the problems mentioned in the background art.

[0006] This application provides a rake dryer, including a cylinder with rotating blades inside. A vacuum dust collector is installed on the cylinder, and a coarse filter mechanism is provided between the vacuum dust collector and the cylinder. The coarse filter mechanism includes an arc-shaped filter plate. A scraper is fixedly connected to the outer end of the blade and slidably connected to the inner surface of the filter plate. A needle plate is vertically movably installed on the upper part of the filter plate, and the needle plate has air holes. The needle rod on the needle plate movably passes through the filter holes on the filter plate. A protrusion is fixedly connected to the needle plate and protrudes from the filter plate. A roller is rotatably connected to the scraper, and the roller abuts against the protrusion.

[0007] In one specific implementation, the coarse filtration mechanism further includes a flange seat, which is installed between the vacuum dust collector and the cylinder. The flange seat is fixedly connected to the filter plate, and the needle plate is vertically slidably connected to the flange seat.

[0008] In the above implementation process, the vacuum dust collector is fixed to the cylinder by a flange, while the coarse filter mechanism proposed in this application can be directly inserted into the upper end of the cylinder and installed together with the vacuum dust collector, which is convenient for adding and modifying existing dryers.

[0009] In one specific implementation, a rotating shaft is rotatably connected inside the cylinder, and the blades are arranged in a circumferential array on the rotating shaft.

[0010] In the above process, the rotating shaft drives the blades to rotate, which agitates the material inside the cylinder, thus facilitating the drying of the material.

[0011] In one specific implementation, a power mechanism is also included, which includes a motor, the output of which is poweredly connected to the rotating shaft.

[0012] In one specific implementation, the power mechanism further includes a reducer and a coupling. The power of the motor is transmitted to the input end of the reducer via a belt, and the output end of the reducer is connected to the rotating shaft via the coupling.

[0013] In the above process, the output of the motor is transmitted upward to the cycloidal pinwheel reducer via belt pulley, which reduces the speed to 4-9 RPM. Then, it is transmitted to the rotating shaft via a coupling, which drives the paddle to rotate slowly. The low stirring speed can further reduce the material being thrown up.

[0014] In one specific implementation, the outer surface of the cylinder is provided with thermal insulation cotton.

[0015] In the above process, an electric heating wire is also embedded in the inner wall of the cylinder to increase the temperature and further improve the drying effect, while the insulation cotton is used to reduce heat loss.

[0016] In one specific implementation, the cylinder is provided with a feed inlet and a discharge outlet.

[0017] In the above process, the feed port is used to feed materials into the cylinder, and the discharge port is a short-necked pneumatic hemispherical valve, which can reduce material residue.

[0018] In one specific implementation, a control cabinet is also included, which is electrically connected to the motor.

[0019] In the above process, the control cabinet is used to operate the dryer normally.

[0020] Compared with the prior art, the beneficial effects of this application are: the filter plate blocks the vacuum dust collector in front of it for preliminary filtration; the paddle drives the scraper to scrape off the material adsorbed on the surface of the filter plate; at the same time, the movement of the scraper will also lift the needle plate through the roller, so that the needle rod on the needle plate moves back and forth in the filter hole of the filter plate, thereby helping the material stuck in the filter hole to be removed. As a result, the coarse filtration mechanism can reduce its own maintenance frequency and also reduce the maintenance frequency of the vacuum dust collector. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of a rake dryer provided in the embodiments of this application; Figure 2 A schematic diagram illustrating the connection relationship between the scraper and the coarse filter mechanism provided in an embodiment of this application; Figure 3 This is a schematic diagram illustrating the connection relationship between the needle plate and the convex strip in an embodiment of this application.

[0023] In the diagram: 10-Cylinder; 11-Shaft; 12-Blade; 13-Scraper; 14-Roller; 15-Insulation cotton; 16-Inlet; 17-Outlet; 20-Vacuum dust collector; 30-Coarse filter mechanism; 31-Filter plate; 32-Needle plate; 33-Flange seat; 34-Raised strip; 40-Power mechanism; 41-Motor; 42-Reducer; 43-Coupling; 50-Control cabinet. Detailed Implementation

[0024] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0025] Please see Figures 1-3This application provides a rake dryer, including a cylinder 10, with a paddle 12 rotating inside the cylinder 10. A vacuum dust collector 20 is installed on the cylinder 10, and a coarse filter mechanism 30 is installed between the vacuum dust collector 20 and the cylinder 10. The coarse filter mechanism 30 includes an arc-shaped filter plate 31. A scraper 13 is fixedly connected to the outer end of the paddle 12 and slidably connected to the inner surface of the filter plate 31. A needle plate 32 is vertically and movably installed on the upper part of the filter plate 31. The needle plate 32 has air holes. The needle rod on the needle plate 32 moves through the filter holes on the filter plate 31. A protrusion 34 is fixedly connected to the needle plate 32 and protrudes from the filter plate 31. A roller 14 is rotatably connected to the scraper 13 and abuts against the protrusion 34. In this system, the filter plate 31 acts as a barrier before the vacuum dust collector 20, performing preliminary filtration. The paddle 12 drives the scraper 13 to scrape off the material adsorbed on the surface of the filter plate 31. At the same time, the movement of the scraper 13 also lifts the needle plate 32 through the roller 14, causing the needle rod on the needle plate 32 to move back and forth in the filter holes on the filter plate 31, thereby helping the material stuck in the filter holes to be removed. As a result, the coarse filtration mechanism 30 can reduce its own maintenance frequency and also reduce the maintenance frequency of the vacuum dust collector 20.

[0026] Please see Figures 1-3 The coarse filtration mechanism 30 also includes a flange seat 33, which is installed between the vacuum dust collector 20 and the cylinder 10. The flange seat 33 is fixedly connected to the filter plate 31, and the needle plate 32 is vertically slidably connected to the flange seat 33. The vacuum dust collector 20 is fixed to the cylinder 10 by a flange, while the coarse filtration mechanism 30 proposed in this application can be directly inserted into the upper end of the cylinder 10 and installed together with the vacuum dust collector 20, which facilitates the addition and modification of existing dryers.

[0027] Please see Figures 1-3 A rotating shaft 11 is rotatably connected inside the cylinder 10, and blades 12 are arranged in a circular array on the rotating shaft 11. The rotating shaft 11 drives the blades 12 to rotate, which agitates the material inside the cylinder 10, which is beneficial to the drying of the material.

[0028] Please see Figures 1-3 The system also includes a power mechanism 40, which comprises a motor 41, the output of which is connected to the rotating shaft 11. The power mechanism 40 also includes a reducer 42 and a coupling 43. The power from the motor 41 is transmitted to the input of the reducer 42 via a belt drive, and the output of the reducer 42 is connected to the rotating shaft 11 via the coupling 43. The output of the motor 41 is transmitted upwards to the cycloidal pinwheel reducer 42 via a belt pulley drive, where it is reduced to 4-9 RPM. This reduced speed is then transmitted to the rotating shaft 11 via the coupling 43, thereby driving the paddle 12 to rotate slowly. This lower stirring speed further reduces the amount of material being thrown up.

[0029] Please see Figures 1-3The outer surface of the cylinder 10 is provided with heat insulation cotton 15. The inner wall of the cylinder 10 is also embedded with electric heating wires to increase the temperature and further improve the drying effect. The heat insulation cotton 15 is used to reduce heat loss.

[0030] Please see Figures 1-3 The cylinder 10 is provided with a feed inlet 16 and a discharge outlet 17. The feed inlet 16 is used to feed materials into the cylinder 10, and the discharge outlet 17 is a short-necked pneumatic hemispherical valve, which can reduce material residue.

[0031] Please see Figures 1-3 It also includes a control cabinet 50, which is electrically connected to the motor 41. The control cabinet 50 is used to operate the dryer normally.

[0032] The working principle of the rake dryer is as follows: the motor 41 drives the rotating shaft 11 and the blades 12 to rotate, which is used to stir the material. The external air extraction equipment removes the gas in the cylinder 10 through the vacuum dust collector 20 to achieve vacuum drying. The gas and smaller dust in the cylinder 10 will directly pass through the gap between the filter plate 31 and the needle plate 32 into the vacuum dust collector 20. As the blades 12 rotate, the material is lifted up, and larger dust or materials will be adsorbed onto the surface of the filter plate 31. At the same time, the rotation of the blades 12 will also drive the scraper 13 to scrape off the material attached to the surface of the filter plate 31. Meanwhile, when the scraper 13 passes the filter plate 31, the rollers 14 on the scraper 13 will contact the protrusions 34 to lift the needle plate 32. When the scraper 13 leaves the filter plate 31, the needle plate 32 will fall under the action of gravity, so that the needle rod on the needle plate 32 moves back and forth in the filter hole on the filter plate 31, which is conducive to the removal of the material stuck in the filter hole.

[0033] In summary, the filter plate 31 acts as a preliminary filter before the vacuum dust collector 20; the paddle 12 drives the scraper 13 to scrape off the material adsorbed on the surface of the filter plate 31; at the same time, the movement of the scraper 13 will also lift the needle plate 32 through the roller 14, so that the needle rod on the needle plate 32 moves back and forth in the filter hole on the filter plate 31, thereby helping the material stuck in the filter hole to be removed. As a result, the coarse filtration mechanism 30 can reduce its own maintenance frequency and also reduce the maintenance frequency of the vacuum dust collector 20.

[0034] The above are merely embodiments of this application and are not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, improvements, or equivalent substitutions made within the spirit and principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

Claims

1. A rake-type dryer, characterized in that, The device includes a cylindrical body (10), inside which a paddle (12) rotates. A vacuum dust collector (20) is installed on the cylindrical body (10). A coarse filter mechanism (30) is installed between the vacuum dust collector (20) and the cylindrical body (10). The coarse filter mechanism (30) includes an arc-shaped filter plate (31). A scraper (13) is fixedly connected to the outer end of the paddle (12) and slides to the inner surface of the filter plate (31). A needle plate (32) is vertically and movably installed on the upper part of the filter plate (31). A vent hole is opened on the needle plate (32). The needle rod on the needle plate (32) moves through the filter hole on the filter plate (31). A protrusion (34) is fixedly connected to the needle plate (32) and protrudes out of the filter plate (31). A roller (14) is rotatably connected to the scraper (13) and abuts against the protrusion (34).

2. The rake dryer according to claim 1, characterized in that, The coarse filtration mechanism (30) also includes a flange seat (33), which is installed between the vacuum dust collector (20) and the cylinder (10). The flange seat (33) is fixedly connected to the filter plate (31), and the needle plate (32) is vertically slidably connected to the flange seat (33).

3. A rake dryer according to claim 2, characterized in that, The cylinder (10) is rotatably connected to a rotating shaft (11), and the blades (12) are arranged in a circular array on the rotating shaft (11).

4. A rake dryer according to claim 3, characterized in that, It also includes a power mechanism (40), which includes a motor (41), the output end of which is poweredly connected to the rotating shaft (11).

5. A rake dryer according to claim 4, characterized in that, The power mechanism (40) also includes a reducer (42) and a coupling (43). The power of the motor (41) is transmitted to the input end of the reducer (42) via a belt, and the output end of the reducer (42) is connected to the rotating shaft (11) via the coupling (43).

6. A rake dryer according to claim 5, characterized in that, The outer surface of the cylinder (10) is provided with thermal insulation cotton (15).

7. A rake dryer according to claim 6, characterized in that, The cylinder (10) is provided with a feed inlet (16) and a discharge outlet (17).

8. A rake dryer according to claim 7, characterized in that, It also includes a control cabinet (50) which is electrically connected to the motor (41).

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