A drying device for DHPPA

Abstract

The application discloses a drying device for DHPPA and relates to the technical field of DHPPA processing. The drying device comprises a double-cone rotary vacuum drying machine body, a vacuum filter cover is arranged in the tank body of the double-cone rotary vacuum drying machine body, a sleeve pipe fixed to the inner wall of the tank body is arranged on the vacuum filter cover, and a cleaning mechanism for cleaning and preventing blockage of filter holes on the vacuum filter cover is arranged in the sleeve pipe. The tank body of the double-cone rotary vacuum drying machine body drives the extrusion plate of the telescopic frame to rotate along the convex plate of the fixing frame while rotating, drives the cleaning brush to extend out of the sleeve pipe to brush the vacuum filter cover under the drive of the convex plate, and resets the cleaning brush in the sleeve pipe under the action of the tension spring. The bristles on the cleaning brush are poked under the action of the poking ring on the inner side of the convex plate, so that the cleaning brush is kept in integrity, and the effect of cleaning the vacuum filter cover by the cleaning brush again is improved.

Description

Technical Field

[0001] This invention relates to the technical field of DHPPA processing, and more specifically to a drying apparatus for DHPPA. Background Technology

[0002] The quality requirements for DHPPA (R-(+)-2-(4-hydroxyphenoxy)propionic acid) dictate that its water content per unit mass must be less than 0.3%. Therefore, drying is necessary during production to ensure the product meets quality standards. DHPPA drying typically employs a double-cone rotary vacuum drying device. This device, through its vacuum environment and dynamic rotary heating design, effectively reduces product loss during drying, thereby increasing product yield. When drying using this device, a vacuum pump is needed to evacuate the tank to maintain its vacuum state. However, the vacuum filter used for evacuation is easily clogged by DHPPA powder, affecting the effectiveness of the vacuum evacuation. Summary of the Invention

[0003] The purpose of this invention is to provide a drying apparatus for DHPPA to overcome the above-mentioned defects in the prior art.

[0004] A drying apparatus for DHPPA includes a double cone rotary vacuum dryer body, wherein a vacuum filter cover is provided in the tank of the double cone rotary vacuum dryer body, and a sleeve fixed to the inner wall of the tank is fitted on the vacuum filter cover.

[0005] The sleeve is equipped with a cleaning mechanism for cleaning the filter holes on the vacuum filter cover to prevent clogging.

[0006] Preferably, the cleaning mechanism includes a guide rod, a telescopic frame, a tension spring, a cleaning brush, and a fixing frame. The two ends of the guide rod are respectively connected to an outer retaining ring and an inner retaining ring on the sleeve. The telescopic frame is slidably connected to the guide rod. The tension spring is sleeved on the guide rod, with one end connected to the telescopic frame and the other end connected to the inner retaining ring. The cleaning brush is located at the outer end of the telescopic frame. The telescopic frame is provided with a squeezing plate. The fixing frame is located on the connecting pipe of the vacuum filter cover and is provided with a protruding plate.

[0007] Preferably, the two sides of the convex plate are provided with arc-shaped transition surfaces at the connection with the fixing frame.

[0008] Preferably, the fixing frame is fixed to the connecting tube of the vacuum filter cover by a connecting ring.

[0009] Preferably, the fixing frame has a dial ring on the inner side of the convex plate that is directly opposite the connecting ring, and the dial ring is slidably inserted into the limiting block on the inner wall of the convex plate.

[0010] Preferably, each extrusion plate has a guide wheel rotatably connected to the end that contacts the convex plate.

[0011] Preferably, there are two guide rods symmetrically arranged on both sides of the telescopic frame.

[0012] Preferably, the cleaning brush has an arc-shaped structure and is provided in multiple forms, with the cleaning brushes evenly distributed along the circumference of the telescopic frame.

[0013] Preferably, the guide rod is slidably connected to the connecting lug on the side of the telescopic frame.

[0014] Preferably, a number of triangular extrusion plates are evenly distributed along the inner circumference of the telescopic frame, and a number of triangular convex plates are evenly distributed along the circumference of the fixed frame, wherein the extrusion plates and the convex plates correspond one-to-one.

[0015] The beneficial effects achieved by this invention are as follows:

[0016] This application utilizes the double-cone rotary vacuum dryer body to rotate the tank body, which simultaneously drives the extrusion plate of the telescopic frame to rotate along the convex plate of the fixed frame. Driven by the convex plate, the cleaning brush extends out of the sleeve to brush the vacuum filter cover. Under the action of the tension spring, it returns to the sleeve. Under the action of the deflector ring on the inner side of the convex plate, the bristles on the cleaning brush are deflected, keeping the cleaning brush as a whole and improving the cleaning effect of the cleaning brush to clean the vacuum filter cover again. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall internal structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the outer structure of the sleeve and cleaning mechanism of the present invention.

[0019] Figure 3 This is a schematic diagram of the inner structure of the sleeve and cleaning mechanism of the present invention.

[0020] Figure 4 This is a schematic diagram of the cleaning mechanism of the present invention.

[0021] Figure 5 This is a schematic diagram of the telescopic frame, cleaning brush, and extrusion plate of the present invention.

[0022] Figure 6 for Figure 5 A magnified view of a portion of point A in the middle.

[0023] Figure 7 This is a schematic diagram of the structure of the fixing frame, connecting ring, protruding plate and dial ring of the present invention.

[0024] In the diagram, 1. Double cone rotary vacuum dryer body; 2. Tank; 3. Sleeve; 31. Outer retaining ring; 32. Inner retaining ring; 4. Vacuum filter cover; 5. Cleaning mechanism; 51. Guide rod; 52. Telescopic frame; 53. Tension spring; 54. Cleaning brush; 55. Extrusion plate; 551. Guide wheel; 56. Fixing frame; 561. Connecting ring; 562. Protruding plate; 563. Arc-shaped transition surface; 57. Dial ring; 58. Limiting block. Detailed Implementation

[0025] The following detailed description of the embodiments, with reference to the accompanying drawings, will further illustrate the specific implementation of the present invention, in order to help those skilled in the art to have a more complete, accurate, and in-depth understanding of the concept and technical solutions of the present invention.

[0026] like Figure 1-7 As shown, the present invention provides a drying device for DHPPA, including a double cone rotary vacuum dryer body 1, a vacuum filter cover 4 in the tank body 2 of the double cone rotary vacuum dryer body 1, and a sleeve 3 fixed to the inner wall of the tank body 2 on the vacuum filter cover 4.

[0027] The sleeve 3 is provided with a cleaning mechanism 5 for cleaning and preventing clogging of the filter holes on the vacuum filter cover 4. The cleaning mechanism 5 includes a guide rod 51, a telescopic frame 52, a tension spring 53, a cleaning brush 54, and a fixing frame 56. There are two guide rods 51, which are symmetrically arranged on both sides of the telescopic frame 52. The guide rods 51 are slidably connected to the connecting ears on the side of the telescopic frame 52. The two ends of the guide rods 51 are respectively connected to the outer retaining ring 31 and the inner retaining ring 32 on the sleeve 3. The telescopic frame 52 is slidably connected to the guide rods 51. The tension spring 53 is sleeved on the guide rods 51 and one end of it is connected to the telescopic frame 52. The other end of the tension spring 53 is connected to the inner retaining ring 32.

[0028] The cleaning brush 54 has an arc-shaped structure and is provided in several parts. The cleaning brush 54 is evenly distributed along the circumference of the telescopic frame 52. The vacuum filter cover 4 is cleaned by the cleaning brush 54. The telescopic frame 52 is provided with a pressing plate 55. The fixing frame 56 is fixed to the connecting pipe of the vacuum filter cover 4 by a connecting ring 561. The fixing frame 56 is provided with a protruding plate 562. Each pressing plate 55 has a guide wheel 551 rotatably connected to one end of the protruding plate 55 that contacts the protruding plate 562, thereby reducing the friction between the pressing plate 55 and the protruding plate 562. The two sides of the protruding plate 562 are provided with arc-shaped transition surfaces 563 at the connection between the fixing frame 56 and the fixing frame 56.

[0029] Several triangular extrusion plates 55 are evenly distributed along the inner circumference of the telescopic frame 52, and several triangular convex plates 562 are evenly distributed along the circumference of the fixed frame 56. The extrusion plates 55 and the convex plates 562 correspond one-to-one.

[0030] The fixing frame 56 has a dial ring 57 on the inner side of the convex plate 562, which is directly opposite to the connecting ring 561. The dial ring 57 is slidably inserted into the limiting block 58 on the inner wall of the convex plate 562.

[0031] Detailed implementation methods and principles:

[0032] During operation, the DHPPA to be dried is placed in the tank 2 through the top feed port of the tank 2 of the double cone rotary vacuum dryer body 1. Then, the top of the tank 2 is sealed. Under the action of the vacuum pump, the tank 2 is evacuated through the vacuum filter 4. At this time, the cleaning brush 54 is located in the sleeve 3. After the tank 2 is evacuated, the heating mechanism in the tank 2 is started and the motor is turned on. The motor drives the tank 2 to rotate. As the tank 2 rotates, it drives the sleeve 3 on its inner wall to rotate, thereby causing the telescopic frame 52 to rotate. At the same time as the telescopic frame 52 rotates, the extrusion plate 55 on it moves under the drive of the convex plate 562 of the fixed frame 56. This causes the cleaning brush 54 to extend out of the sleeve 3, and the cleaning brush 54 brushes the filter holes on the vacuum filter cover 4. When the extrusion plate 55 on the telescopic frame 52 is located between the two protruding plates 562 of the fixed frame 56, the cleaning brush 54 returns to the sleeve 3 under the action of the tension spring 53 on the guide rod 51, and the brush bristles on the cleaning brush 54 are moved by the action of the deflector ring 57 to keep them clean. The pressure gauge on the tank 2 can monitor the pressure inside the tank 2 at all times. When the vacuum degree does not meet the set value, the vacuum pump can perform vacuuming during the drying process. The cleaning brush 54 can clean the filter holes on the vacuum filter cover 4 to avoid affecting the efficiency of vacuuming.

[0033] In summary, this application utilizes the rotating body 2 of the double-cone rotary vacuum dryer to drive the extrusion plate 55 of the telescopic frame 52 to rotate along the protrusion plate 562 of the fixed frame 56. Driven by the protrusion plate 562, the cleaning brush 54 extends out of the sleeve 3 to brush the vacuum filter cover 4. Under the action of the tension spring 53, it returns to the sleeve 3. Under the action of the deflector ring 57 on the inner side of the protrusion plate 562, the bristles on the cleaning brush 54 are deflected, keeping the cleaning brush 54 as a whole and improving the cleaning effect of the cleaning brush 54 in cleaning the vacuum filter cover 4 again.

[0034] The embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A drying device for DHPPA, comprising a double-cone rotary vacuum drying machine body (1), a vacuum filter cover (4) is arranged in the tank body (2) of the double-cone rotary vacuum drying machine body (1), characterized in that: The vacuum filter cover (4) is fitted with a sleeve (3) that is fixed to the inner wall of the tank (2). The sleeve (3) is provided with a cleaning mechanism (5) for cleaning and preventing clogging of the filter holes on the vacuum filter cover (4); The cleaning mechanism (5) includes a guide rod (51), a telescopic frame (52), a tension spring (53), a cleaning brush (54), and a fixing frame (56). The two ends of the guide rod (51) are respectively connected to the outer retaining ring (31) and the inner retaining ring (32) on the sleeve (3). The telescopic frame (52) is slidably connected to the guide rod (51). The tension spring (53) is sleeved on the guide rod (51) and one end is connected to the telescopic frame (52). The other end of the tension spring (53) is connected to the inner retaining ring (32). The cleaning brush (54) is located at the outer end of the telescopic frame (52). The telescopic frame (52) is provided with a pressing plate (55). The fixing frame (56) is located on the connecting pipe of the vacuum filter cover (4). The fixing frame (56) is provided with a protruding plate (562).

2. The drying apparatus for DHPPA according to claim 1, characterized in that: The convex plate (562) has arc-shaped transition surfaces (563) at the connection between its two sides and the fixing frame (56).

3. The drying apparatus for DHPPA according to claim 1, characterized in that: The fixing frame (56) is fixed to the connecting pipe of the vacuum filter cover (4) by the connecting ring (561).

4. The drying apparatus for DHPPA according to claim 3, characterized in that: The fixing frame (56) has a dial ring (57) on the inner side of the convex plate (562) that is directly opposite to the connecting ring (561). The dial ring (57) is slidably inserted into the limiting block (58) on the inner wall of the convex plate (562).

5. The drying apparatus for DHPPA as claimed in claim 1, wherein: Each extrusion plate (55) has a guide wheel (551) rotatably connected to one end of the plate (562) that contacts the protrusion plate (562).

6. The drying apparatus for DHPPA according to claim 1, characterized in that: The guide rod (51) is provided in two and is symmetrically arranged on both sides of the telescopic frame (52).

7. The drying apparatus for DHPPA as claimed in claim 1, wherein: The cleaning brush (54) has an arc-shaped structure and is provided in several parts. The cleaning brush (54) is evenly distributed along the circumference of the telescopic frame (52).

8. The drying apparatus for DHPPA according to claim 6, characterized in that: The guide rod (51) is slidably connected to the connecting lug on the side of the telescopic frame (52).

9. The drying apparatus for DHPPA as claimed in claim 2, wherein: Several triangular extrusion plates (55) are evenly distributed along the inner circumference of the telescopic frame (52), and several triangular convex plates (562) are evenly distributed along the circumference of the fixed frame (56). The extrusion plates (55) and convex plates (562) correspond one-to-one.

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