A side scraper device for a dry granulator

Abstract

The utility model relates to dry granulator technical field especially is involved in a kind of side scraper device for dry granulator, including granulator, material conveying mechanism and compression roller, the material conveying mechanism and compression roller are all set in the surface of granulator, two are set on compression roller, and located the discharge end of material conveying mechanism, the discharge end of material conveying mechanism is provided with material conveying nozzle, the front and rear sides of material conveying nozzle are provided with pressing plate, the surface of pressing plate is provided with side scraper assembly, the top and bottom of material conveying nozzle are provided with shaft surface scraper.This application is matched by side scraper assembly and axial scraper and elastic support, the efficient cleaning of the side edge and axial clearance of compression roller is realized.The flexible position adjustment function is provided by the sliding groove and locking bolt set in the inner side of compression roller, so that scraper assembly can adapt to compression roller of multiple specifications.The overall structure is simple and compact, easy to install and maintain, significantly improve the running stability and product cleanliness of dry granulator.

Description

Technical Field

[0001] This utility model relates to the field of small preform manufacturing technology, specifically to a side scraper device for a dry granulator. Background Technology

[0002] Dry granulation machines are widely used in the pharmaceutical, food, and chemical industries. In actual production, the cleanability of the pressure rollers significantly impacts equipment stability and product quality. However, materials tend to adhere to the sides of the pressure rollers or bearing areas during the pressing process, making cleaning difficult and potentially affecting product quality consistency.

[0003] A search revealed that invention patent CN104707537B discloses an inclined extrusion system for a dry granulator. This system uses inclined rollers and scraper assemblies to remove residual material from the roller surface, improving material conveying efficiency and reducing the risk of gas explosions. However, the scraper structure in this design only acts on the outer circumferential surface of the rollers, failing to effectively clean the sides and axial gaps, thus still posing risks of material accumulation and seal failure.

[0004] The above situation indicates that existing dry pellet mills have certain limitations in cleaning the sides of the pressure rollers, especially under complex operating conditions where it is difficult to completely remove residual material from the sides, thus affecting the stability of equipment operation and the cleanliness requirements of the product. Therefore, there is an urgent need for a side scraper device for dry pellet mills to improve the cleaning performance and operational reliability of the equipment. Summary of the Invention

[0005] The purpose of this invention is to provide a side scraper device for a dry granulator to solve the problem of incomplete cleaning of the side and axial gaps of the pressure rollers mentioned in the background art. To achieve the above objective, this invention provides a side scraper device for a dry granulator, including a granulator, a feeding mechanism, and pressure rollers. The feeding mechanism and pressure rollers are both disposed on the surface of the granulator. Two pressure rollers are disposed vertically and located at the discharge end of the feeding mechanism. The discharge end of the feeding mechanism is provided with a feeding nozzle. Pressure plates are provided on the front and rear sides of the feeding nozzle. Side scraper assemblies are disposed on the surface of the pressure plates. Axial scrapers are disposed on the top and bottom of the feeding nozzle.

[0006] Furthermore, the side scraper assembly includes a positioning pin and a lever arm. One end of the lever arm is inserted into the positioning pin and fixed by bolts. The inner side of the lever arm is provided with a mounting base fixedly connected by a spring and a limiting rod. The side of the mounting base is provided with a side scraper.

[0007] Furthermore, the mounting base has a groove-like structure, and the limiting rod is specifically composed of a hollow round tube and a solid rod that is movably inserted into the round tube.

[0008] Furthermore, a pin is provided at the end of the axial scraper away from the axial surface of the pressure roller, a sliding groove is provided on the inner side of the pressure plate, the end of the pin is inserted into the sliding groove, and a locking bolt and a torsion spring are sleeved on the pin.

[0009] Furthermore, the material conveying mechanism includes a hopper, inside which a spiral conveying rod is provided. One end of the hopper is connected to the conveying nozzle, and the other end of the hopper has a through hole for connecting an external motor to the spiral conveying rod.

[0010] Compared with existing technologies, the technical solution of this utility model achieves efficient cleaning of the sides and axial gaps of the pressure roller through the cooperation of the side scraper assembly, axial scraper, and elastic support. The sliding groove and locking bolts on the inner side of the pressure roller provide flexible position adjustment, allowing the scraper assembly to adapt to various pressure roller specifications. The overall structure is simple and compact, easy to install and maintain, and significantly improves the operational stability and product cleanliness of the dry granulation machine. Attached Figure Description

[0011] Figure 1 Main structural view of this utility model;

[0012] Figure 2 This is a three-dimensional structural diagram of the present invention;

[0013] Figure 3 for Figure 2 A three-dimensional structural diagram from another angle;

[0014] Figure 4 for Figure 2 Enlarged view of a local structure in the image;

[0015] Figure 5 This is a schematic diagram of the structure of the central axial surface scraper of this utility model.

[0016] The attached figures are labeled as follows:

[0017] 1. Pelletizer; 2. Feeding mechanism; 201. Hopper; 202. Screw conveyor; 3. Pressure roller; 4. Feeding nozzle; 5. Pressure plate; 6. Side scraper assembly; 601. Positioning pin; 602. Lever arm; 603. Spring; 604. Limiting rod; 605. Mounting base; 606. Side scraper; 7. Shaft scraper; 8. Pin; 9. Sliding groove; 10. Locking bolt; 11. Torsion spring. Detailed Implementation

[0018] 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.

[0019] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” and “described” used herein may also include the plural forms. It should be further understood that the word “comprising” as used in this specification means the presence of the described features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0020] Please refer to Figures 1-5 As shown, this utility model relates to a side scraper device for a dry granulator, including a granulator 1, a feeding mechanism 2, and a pressure roller 3. The feeding mechanism 2 and the pressure roller 3 are both disposed on the surface of the granulator 1. Two pressure rollers 3 are disposed vertically and located at the discharge end of the feeding mechanism 2. The discharge end of the feeding mechanism 2 is provided with a feeding nozzle 4. Pressure plates 5 are disposed on the front and rear sides of the feeding nozzle 4. A side scraper assembly 6 is disposed on the surface of the pressure plate 5. The scraper of the side scraper assembly 6 is in contact with the side of the pressure roller 3 for cleaning its side. A axial scraper 7 is disposed on the top and bottom of the feeding nozzle 4. The axial scraper 7 is in contact with the axial surface (curved surface) of the pressure roller 3 for cleaning its axial surface. It should be noted that two sets of side scraper assemblies 6 and axial scrapers 7 are disposed on the pressure plate 5 at the same time to clean the upper and lower pressure rollers 3 simultaneously.

[0021] The specific structure of the side scraper assembly 6 is as follows: Figure 4 As shown, the side scraper assembly 6 includes a positioning pin 601 and a lever arm 602. One end of the lever arm 602 is inserted into the positioning pin 601 and fixed with bolts. The inner side of the lever arm 602 is provided with a mounting base 605 fixedly connected by a spring 603 and a limiting rod 604. The side of the mounting base 605 is provided with a side scraper 606. When the pressure roller 3 rotates, the side scraper 606 cleans the side of the pressure roller 3. The side scraper 606 is connected to the mounting base 605 by the spring 603, so that the side scraper 606 can be in close contact with the side of the pressure roller 3. At the same time, the removed powder slides down through the groove structure on the mounting base 605. In this application, a collection box can be set on the granulator 1. Specifically, the collection box can be set below the pressure roller 3.

[0022] It is important to note that the connection between the limit rod 604 and the mounting base 605 is a threaded connection. Specifically, the mounting base 605 has a threaded groove. Depending on the size of the pressure roller 3, different lengths of the mounting base 605 and the side scraper 606 can be replaced to match the size of the pressure roller 3.

[0023] A pin 8 is provided at the end of the axial scraper 7 away from the axial surface of the pressure roller 3. A sliding groove 9 is provided on the inner side of the pressure plate 5. The end of the pin 8 is inserted into the sliding groove 9. A locking bolt 10 and a torsion spring 11 are sleeved on the pin 8. Depending on the size of the pressure roller 3, the specific position of the pressure plate 5 in the sliding groove 9 can be adjusted to make the axial scraper 7 fit closer to the axial surface of the pressure roller 3. Then, the locking bolt 10 is tightened to fix the position of the axial scraper 7. The torsion spring 11 allows the axial scraper 7 to deflect at a certain angle during cleaning, so that it can better fit the axial surface of the pressure roller 3 and improve the cleaning effect.

[0024] The cutting edges of the side scraper 606 and the axial scraper 7 are coated with a wear-resistant coating made of tungsten carbide. This coating is specially treated to have high hardness and wear resistance, which can significantly extend the service life of the two scrapers. The steel material of the spring 603 and the torsion spring 11 is strengthened by heat treatment, giving them good elasticity and fatigue resistance, ensuring that the two side scrapers maintain a stable fit during long-term operation.

[0025] The material conveying mechanism 2 includes a hopper 201, and a spiral conveying rod 202 is provided inside the hopper 201. The end of the hopper 201 is connected to the conveying nozzle 4, and the other end of the hopper 201 has a through hole for connecting an external motor to the spiral conveying rod 202.

[0026] When the dry granulator starts, the pressure rollers begin to rotate at high speed. During the pressing process, material easily adheres to the sides and axial gaps of the pressure rollers. At this time, the side scraper 606, under the action of the spring 603, maintains a tight fit with the side of the pressure roller. The axial scraper 7, by adjusting its position within the sliding groove 9, can better fit with the axial surface of the pressure roller 3. The tungsten carbide wear-resistant coating on the cutting edge further enhances the wear resistance of both scrapers, extending their service life. During the rotation of the pressure rollers, the cooperation of the side scraper 606 and the axial scraper 7 effectively removes residual material from the sides and axial gaps of the pressure rollers, preventing material accumulation that could lead to seal failure or affect product quality.

[0027] This utility model features a simple and compact overall structure, facilitating installation and maintenance. The cooperation of torsion spring 11 and spring 603 enables efficient cleaning of the sides and axial gaps of the pressure roller. The sliding groove 9 on the inner side of the pressure plate 5 provides flexible position adjustment, allowing the axial scraper 7 to adapt to various pressure roller specifications. The overall structural design fully considers the needs of practical application scenarios, significantly improving the operational stability and product cleanliness of the dry granulation machine.

[0028] 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 preferred examples and are not intended to limit the 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. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A side scraper device for a dry granulator, comprising a granulator (1), a conveying mechanism (2), and a pressure roller (3), wherein the conveying mechanism (2) and the pressure roller (3) are both disposed on the surface of the granulator (1), and two pressure rollers (3) are disposed vertically and located at the discharge end of the conveying mechanism (2), characterized in that: The material conveying mechanism (2) is provided with a material conveying nozzle (4) at the discharge end. Pressure plates (5) are provided on the front and rear sides of the material conveying nozzle (4). Side scraper assembly (6) is provided on the surface of the pressure plate (5). Axial scraper (7) is provided on the top and bottom of the material conveying nozzle (4).

2. The side scraper device for a dry granulator according to claim 1, characterized in that: The side scraper assembly (6) includes a positioning pin (601) and a lever arm (602). One end of the lever arm (602) is inserted into the positioning pin (601) and fixed by bolts. The inner side of the lever arm (602) is provided with a mounting base (605) fixedly connected by a spring (603) and a limiting rod (604). The side of the mounting base (605) is provided with a side scraper (606).

3. The side scraper device for a dry granulator according to claim 2, characterized in that: The mounting base (605) has a groove-like structure, and the limiting rod (604) is specifically composed of a hollow round tube and a solid rod that is movably inserted into the round tube.

4. The side scraper device for a dry granulator according to claim 3, characterized in that: The end of the axial scraper (7) away from the axial surface of the pressure roller (3) is provided with a pin (8), and the inner side of the pressure plate (5) is provided with a sliding groove (9). The end of the pin (8) is inserted into the sliding groove (9), and a locking bolt (10) and a torsion spring (11) are sleeved on the pin (8).

5. The side scraper device for a dry granulator according to claim 4, characterized in that: The material conveying mechanism (2) includes a hopper (201), and a spiral conveying rod (202) is provided inside the hopper (201). The end of the hopper (201) is connected to the conveying nozzle (4), and the other end of the hopper (201) has a through hole for connecting an external motor to the spiral conveying rod (202).

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