Vibrating screen for producing hydroxypropyl methyl cellulose

Abstract

The utility model discloses a vibrating screen for hydroxypropyl methyl cellulose production, which comprises a vibrating screen box, the upper end of the vibrating screen box is sequentially and fixedly connected with a collecting hopper and a dispersion drying box, one side of the upper end of the dispersion drying box is provided with a feeding hopper, the vibrating screen further comprises a screen and a vibrating screening mechanism, the screen is fixed to the joint of the collecting hopper and the dispersion drying box, the dispersion drying mechanism is arranged in the dispersion drying box above the screen, and the vibration screening mechanism is arranged in the vibration screening box and below the screen. The dispersing and drying mechanism comprises a rotating shaft rotationally connected to the inner walls of the two sides of the dispersing and drying box, the rotating shaft is hollow, aeration holes and dispersing and stirring rods are evenly distributed on the side wall of the rotating shaft, and the dispersing and stirring rods are perpendicular to the rotating shaft. The utility model belongs to the technical field of hydroxypropyl methyl cellulose production, and particularly relates to a vibrating screen for hydroxypropyl methyl cellulose production.

Description

Technical Field

[0001] This utility model belongs to the field of hydroxypropyl methylcellulose production technology, specifically referring to a vibrating screen for hydroxypropyl methylcellulose production. Background Technology

[0002] Hydroxypropyl methylcellulose is a semi-synthetic, inactive, viscoelastic polymer that is widely used in construction, petroleum, food, pharmaceutical and cosmetic fields. It is mainly prepared by alkalizing, etherifying, neutralizing and washing cotton, and the finished product is a white or off-white powder.

[0003] In the production process of hydroxypropyl methylcellulose, it is necessary to use a vibrating screen to screen and remove impurities. Existing vibrating screens, such as the vibrating screen for hydroxypropyl methylcellulose production disclosed in application number CN202221324945.5, dry hydroxypropyl methylcellulose with drying powder in an internal filtration and drying mechanism, and classify and screen it using multi-layer sieve plates.

[0004] However, in actual use, the drying method using dry powder not only requires frequent powder replacement, which is complicated and wastes manpower, but also has poor drying effect. In addition, since hydroxypropyl methylcellulose is in powder form, the powder particles are easy to adhere to each other and have a certain degree of stickiness. Single vibration can easily cause the filter pores to be blocked. In particular, during the production process, hydroxypropyl methylcellulose powder is prone to moisture and agglomeration, which further increases the risk of blockage. Utility Model Content

[0005] In view of the above situation and to overcome the defects of the prior art, this utility model provides a vibrating screen for the production of hydroxypropyl methylcellulose, which effectively solves the problems of poor drying effect and low efficiency of existing vibrating screens for the production of hydroxypropyl methylcellulose, and also solves the problem that a single vibration mode is prone to clogging the filter pores.

[0006] The technical solution adopted by this utility model is as follows: This utility model proposes a vibrating screen for the production of hydroxypropyl methylcellulose, including a vibrating screen box. A collection hopper and a dispersion drying box are sequentially fixedly connected to the upper end of the vibrating screen box. A feeding hopper is provided on one side of the upper end of the dispersion drying box. It also includes a screen and a vibrating screening mechanism. The screen is fixed at the connection between the collection hopper and the dispersion drying box. A dispersion drying mechanism is provided in the dispersion drying box above the screen. The vibrating screening mechanism is located inside the vibrating screen box and below the screen. The dispersion drying mechanism includes a rotating shaft rotatably connected to the inner walls of both sides of the dispersion drying box. The rotating shaft is hollow. Aeration holes and dispersion stirring rods are evenly distributed on the side walls of the rotating shaft. The dispersion stirring rods are perpendicular to the rotating shaft.

[0007] As an improvement to this solution, the vibrating screening mechanism includes telescopic guide rods, a screen bucket, and piezoelectric ceramic plates. The telescopic guide rods are fixed to the inner wall of the vibrating screen box and distributed along the horizontal direction. The screen bucket is fixed on the telescopic guide rods and located between two symmetrical telescopic guide rods. The piezoelectric ceramic plates are fixed to the lower end of the filter screen at the bottom of the screen bucket and are evenly distributed along the length direction.

[0008] As an improvement to this solution, a rotating joint is rotatably connected to the side wall of the dispersion drying chamber, and one end of the rotating joint passes through the side wall of the dispersion drying chamber and is connected to the rotating shaft. Exhaust plates are symmetrically arranged on the side walls of the dispersion drying chamber on both sides of the rotating shaft. A filter screen is provided on the side of the exhaust plate near the inner wall of the dispersion drying chamber to prevent powder from flying out.

[0009] As an improvement to this solution, a geared motor is fixed on one side of the dispersion drying box that is symmetrical to the rotary joint, and the output shaft of the geared motor is connected to the rotating shaft.

[0010] As an improvement to this solution, a return spring is provided between the screen bucket and the inner wall of the vibrating screen box, and the return spring is arranged around the telescopic guide rod. A protective cover is fixed on the inner wall of the vibrating screen box, and a cam is rotatably connected to the upper end of the protective cover. An arc-shaped wear-resistant spring is fixed in the middle of the side wall of the screen bucket, and the cam is in contact with the wear-resistant spring.

[0011] As an improvement to this solution, a drive motor is fixed on the outer wall of the vibrating screen box. The output shaft of the drive motor passes through one end of the vibrating screen box and the bottom of the cam, and bevel gears are provided therein, with the two sets of bevel gears meshing with each other.

[0012] As an improvement to this solution, sight glasses are provided on both sides of the collecting hopper, and a feeding roller is provided inside the feeding hopper. Several rectangular thin plates are evenly distributed on the side wall of the feeding roller. The feeding roller can be used to feed materials while preventing powder from flying out of the feeding hopper.

[0013] The beneficial effects of this utility model by adopting the above structure are as follows:

[0014] 1. It is equipped with a dispersion drying mechanism, which uses hot air instead of a powder dryer, avoiding the problems of high labor costs and low efficiency caused by frequent replacements. The rotatable dispersion stirring rod can fully disperse and dry the hydroxypropyl methylcellulose powder, which not only ensures product quality but also reduces the risk of subsequent screening blockage.

[0015] 2. The vibrating sieving mechanism adopts multiple vibration modes. The piezoelectric ceramic plate set at the bottom of the screen can change the vibration frequency of the screen by changing the voltage, thereby avoiding clogging. In addition, with the cam on one side, the screen can move back and forth in the horizontal direction, improving the efficiency of hydroxypropyl methylcellulose powder passing through and further ensuring the ability to avoid clogging. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a vibrating screen for the production of hydroxypropyl methylcellulose proposed in this utility model.

[0017] Figure 2 This is a cross-sectional view of a vibrating screen for the production of hydroxypropyl methylcellulose proposed in this utility model.

[0018] Figure 3 This is a schematic diagram of the internal structure of a vibrating screen for the production of hydroxypropyl methylcellulose proposed in this utility model;

[0019] Figure 4 This is a partial structural diagram of the vibrating screening mechanism components in this embodiment.

[0020] The components include: 1. Vibrating screen box; 2. Collection hopper; 3. Dispersion drying box; 4. Feeding hopper; 5. Screen; 6. Vibrating screening mechanism; 7. Dispersion drying mechanism; 8. Rotary shaft; 9. Aeration hole; 10. Dispersion stirring rod; 11. Telescopic guide rod; 12. Screen bucket; 13. Piezoelectric ceramic plate; 14. Rotary joint; 15. Exhaust plate; 16. Gear motor; 17. Return spring; 18. Protective cover; 19. Cam; 20. Wear-resistant spring; 21. Drive motor; 22. Bevel gear; 23. Sight glass; 24. Feeding roller.

[0021] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0023] like Figure 1 , Figure 3 , Figure 4 As shown, the present invention proposes a vibrating screen for the production of hydroxypropyl methylcellulose, including a vibrating screen box 1. A collection hopper 2 and a dispersion drying box 3 are sequentially fixedly connected to the upper end of the vibrating screen box 1. A feeding hopper 4 is provided on one side of the upper end of the dispersion drying box 3. The screen also includes a screen 5 and a vibrating screening mechanism 6. The screen 5 is fixed at the connection between the collection hopper 2 and the dispersion drying box 3. A dispersion drying mechanism 7 is provided in the dispersion drying box 3 above the screen 5. The vibrating screening mechanism 6 is located in the vibrating screen box 1 and below the screen 5.

[0024] The dispersion and drying mechanism 7 can disperse and dry hydroxypropyl methylcellulose, which facilitates its sorting by the subsequent vibrating screening mechanism 6 and avoids clogging.

[0025] like Figure 2 As shown, the dispersion drying mechanism 7 includes a rotating shaft 8 rotatably connected to the inner walls of both sides of the dispersion drying box 3, and the rotating shaft 8 is hollow. Aeration holes 9 and dispersion stirring rods 10 are evenly distributed on the side walls of the rotating shaft 8, wherein the dispersion stirring rods 10 are perpendicular to the rotating shaft 8.

[0026] The hollow rotating shaft 8 and its aeration holes 9 allow external hot air to be introduced to dry the interior, making it easy to use and requiring no replacement.

[0027] like Figure 2 and Figure 4 As shown, the vibrating screening mechanism 6 includes a telescopic guide rod 11, a screen bucket 12, and a piezoelectric ceramic plate 13. The telescopic guide rod 11 is fixed on the inner wall of the vibrating screen box 1 and distributed along the horizontal direction. The screen bucket 12 is fixed on the telescopic guide rod 11 and is located between two symmetrical telescopic guide rods 11. The piezoelectric ceramic plate 13 is fixed to the lower end of the bottom filter screen of the screen bucket 12 and is evenly distributed along the length direction.

[0028] The telescopic guide rod 11 ensures that the screen bucket 12 moves horizontally, while the piezoelectric ceramic sheet 13 vibrates when energized, causing the filter screen at the bottom of the screen bucket 12 to vibrate accordingly, further preventing clogging.

[0029] like Figure 1 As shown, in order to allow external hot air to be sent into the dispersion drying chamber 3, a rotating joint 14 is rotatably connected to the side wall of the dispersion drying chamber 3, and one end of the rotating joint 14 passes through the side wall of the dispersion drying chamber 3 and is connected to the rotating shaft 8. Exhaust plates 15 are symmetrically provided on the side walls of the dispersion drying chamber 3 on both sides of the rotating shaft 8. A filter screen is provided on the side of the exhaust plate 15 near the inner wall of the dispersion drying chamber 3 to prevent powder from flying out.

[0030] like Figure 2 As shown, in order to drive the rotating shaft 8, a geared motor 16 is fixed on the side of the dispersion drying box 3 that is symmetrical to the rotating joint 14, and the output shaft of the geared motor 16 is connected to the rotating shaft 8.

[0031] like Figure 2 and Figure 4As shown, a return spring 17 is provided between the screen bucket 12 and the inner wall of the vibrating screen box 1, and the return spring 17 is arranged around the telescopic guide rod 11. A protective cover 18 is fixed on the inner wall of the vibrating screen box 1. A cam 19 is rotatably connected to the upper end of the protective cover 18. An arc-shaped wear-resistant spring 20 is fixed in the middle of the side wall of the screen bucket 12, and the cam 19 is in contact with the wear-resistant spring 20. A drive motor 21 is fixed on the outer wall of the vibrating screen box 1. The output shaft of the drive motor 21 passes through one end of the vibrating screen box 1 and the bottom of the cam 19. Both ends are provided with bevel gears 22, and the two sets of bevel gears 22 mesh with each other.

[0032] like Figure 1 As shown, sight glasses 23 are provided on both sides of the collecting hopper 2, and feeding rollers 24 are provided in the feeding hopper 4. Several rectangular thin plates are evenly distributed on the side wall of the feeding rollers 24. The feeding rollers 24 can be used to feed materials while preventing powder from flying out of the feeding hopper 4. The state of hydroxypropyl methylcellulose can be observed in real time during the sieving process through the sight glasses 23.

[0033] In practical use, hydroxypropyl methylcellulose is added through the upper end of the feeding hopper 4. As the feeding roller 24 rotates, the hydroxypropyl methylcellulose is fed into the dispersion drying chamber 3. The geared motor 16 is turned on to drive the rotating shaft 8 to rotate. Under the action of the dispersing and stirring rod 10 on the side wall of the rotating shaft 8, the hydroxypropyl methylcellulose is stirred and dispersed. At the same time, the external air source is connected through the rotating joint 14, and hot air is introduced and slowly sprayed out from the aeration hole 9, so that the hydroxypropyl methylcellulose in the dispersion drying chamber 3 is dried while being dispersed. As the hydroxypropyl methylcellulose gradually dries and disperses, it falls through the screen 5 into the sieve hopper 12. Then, the drive motor 21 drives the cam 19 to rotate via the bevel gear 22, causing the wear-resistant spring 20 in contact with it to move the screen bucket 12 back and forth in the horizontal direction. When the piezoelectric ceramic plate 13 is energized, it vibrates, causing the filter screen of the upper screen bucket 12 to vibrate, increasing the efficiency of hydroxypropyl methylcellulose powder passing through and avoiding clogging. The filtered hydroxypropyl methylcellulose powder is discharged along the inclined surface at the bottom of the vibrating screen box 1, while larger impurities are discharged along the screen bucket 12 from the side wall of the vibrating screen box 1 on the symmetrical side. The above is the entire process of using the vibrating screen for hydroxypropyl methylcellulose production.

[0034] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A vibrating screen for the production of hydroxypropyl methylcellulose, comprising a vibrating screen box (1), wherein a collecting hopper (2) and a dispersion drying box (3) are sequentially fixedly connected to the upper end of the vibrating screen box (1), and a feeding hopper (4) is provided on one side of the upper end of the dispersion drying box (3), characterized in that: It also includes a screen (5) and a vibrating screening mechanism (6), wherein the screen (5) is fixed at the connection between the hopper (2) and the dispersion drying box (3), and a dispersion drying mechanism (7) is provided in the dispersion drying box (3) above the screen (5), and the vibrating screening mechanism (6) is located in the vibrating screen box (1) and below the screen (5). The dispersion drying mechanism (7) includes a rotating shaft (8) rotatably connected to the inner walls on both sides of the dispersion drying box (3), and the rotating shaft (8) is hollow. Aeration holes (9) and dispersion stirring rods (10) are evenly distributed on the side walls of the rotating shaft (8), wherein the dispersion stirring rods (10) are perpendicular to the rotating shaft (8).

2. The vibrating screen for producing hydroxypropyl methylcellulose according to claim 1, characterized in that: The vibrating screening mechanism (6) includes a telescopic guide rod (11), a screen bucket (12), and a piezoelectric ceramic plate (13). The telescopic guide rod (11) is fixed on the inner wall of the vibrating screen box (1) and distributed along the horizontal direction. The screen bucket (12) is fixed on the telescopic guide rod (11) and is located between two symmetrical telescopic guide rods (11). The piezoelectric ceramic plate (13) is fixed at the lower end of the bottom filter screen of the screen bucket (12) and is evenly distributed along the length direction.

3. The vibrating screen for producing hydroxypropyl methylcellulose according to claim 1, characterized in that: A rotating joint (14) is rotatably connected to the side wall of the dispersion drying box (3), and the rotating joint (14) is connected to the rotating shaft (8) through one end of the side wall of the dispersion drying box (3). Exhaust plates (15) are symmetrically provided on the side walls of the dispersion drying box (3) on both sides of the rotating shaft (8). A filter screen is provided on the side of the exhaust plate (15) near the inner wall of the dispersion drying box (3) to prevent powder from flying out.

4. A vibrating screen for the production of hydroxypropyl methylcellulose according to claim 1 or 3, characterized in that: A geared motor (16) is fixed on one side of the dispersion drying box (3) symmetrical to the rotary joint (14), and the output shaft of the geared motor (16) is connected to the rotating shaft (8).

5. The vibrating screen for producing hydroxypropyl methylcellulose according to claim 2, characterized in that: A return spring (17) is provided between the screen bucket (12) and the inner wall of the vibrating screen box (1), and the return spring (17) is arranged around the telescopic guide rod (11). A protective cover (18) is fixed on the inner wall of the vibrating screen box (1). A cam (19) is rotatably connected to the upper end of the protective cover (18). An arc-shaped wear-resistant spring (20) is fixed in the middle of the side wall of the screen bucket (12), and the cam (19) is in contact with the wear-resistant spring (20).

6. The vibrating screen for producing hydroxypropyl methylcellulose according to claim 5, characterized in that: A drive motor (21) is fixed on the outer wall of the vibrating screen box (1). The output shaft of the drive motor (21) passes through one end of the vibrating screen box (1) and the bottom of the cam (19) and is provided with bevel gears (22), and the two sets of bevel gears (22) mesh with each other.

7. The vibrating screen for producing hydroxypropyl methylcellulose according to claim 1, characterized in that: The collecting hopper (2) has sight glasses (23) on both sides of the side wall, and the feeding hopper (4) has a feeding roller (24) inside. The side wall of the feeding roller (24) is evenly distributed with several rectangular thin plates. The feeding roller (24) can be used to feed the material while preventing the powder from flying out of the feeding hopper (4).

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