Split type conical double screw extrusion tablet press

Abstract

The utility model discloses a kind of split type conical double-screw extrusion tablet press, it is related to extrusion tablet press technical field, including base, the base is provided with two, and two base top portion is fixedly connected with main fixed cylinder and auxiliary fixed cylinder respectively;The auxiliary fixed cylinder top is detachably connected with dismounting cylinder by bolt, and the cavity formed by main fixed cylinder, auxiliary fixed cylinder and dismounting cylinder is rotatably connected with two screw rods inside, the screw rod is segmented structure, and each screw rod section end is fixedly connected with connecting block. This kind of split type conical double-screw extrusion tablet press, screw rod is connected by connecting block plug-in connection and is composed of multiple segmented screw rod section, it is convenient to dismount and replace, and the thread density and structure parameter of different segment screw rod can be designed or replaced according to material requirement, realize the regulation and control of compression ratio and shear strength, satisfy the individualized requirement of various material plasticizing and compression process, improve equipment application range and processing effect.

Description

Technical Field

[0001] This utility model relates to the field of extrusion tableting machine technology, specifically a split-type conical twin-screw extrusion tableting machine. Background Technology

[0002] The conical twin-screw extruder tablet press is a composite equipment that combines the functions of a conical twin-screw extruder and a tablet press, allowing granular or powdered materials to be directly compressed into tablets after extrusion molding.

[0003] To achieve the above functions, a prior art Chinese patent (publication number: CN215359754U) discloses a split-type conical twin-screw extruder tableting machine, including a frame and a conical twin-screw extruder mounted on the frame, a hydraulic power system, a linear guide rail, and a hydraulic locking mechanism. The conical twin-screw extruder consists of a main screw, a secondary screw, a geared motor, rollers, and an extruder barrel. This equipment facilitates manual cleaning of the internal cavity when changing materials: the conical extruder barrel (including the tableting machine) is hydraulically moved forward, separating the conical screw from the barrel for easy manual cleaning. Once the rubber material is cleaned, the conical barrel (including the tableting machine) is hydraulically moved back to its original position, the hydraulic locking device locks it in place, and the equipment resumes operation, thus ensuring material cleanliness and preventing contamination.

[0004] While existing technologies can overcome the shortcomings mentioned above, other problems still exist in their operation: the screws of existing twin-screw extruders are usually designed as a single unit, and the integrated screw structure means that the entire unit must be replaced when there is local wear. Furthermore, the fixed thread parameters cannot respond to the compression ratio requirements of different materials. Utility Model Content

[0005] The purpose of this invention is to provide a split-type conical twin-screw extrusion tablet press to solve the problems in the prior art where the screw of the existing twin-screw extrusion tablet press is usually an integrated design. The integrated screw structure leads to the need to replace the whole machine when there is local wear, and the fixed thread parameters cannot respond to the compression ratio requirements of different materials.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a split-type conical twin-screw extrusion tablet press, including a base, wherein two bases are provided, and a main fixed cylinder and an auxiliary fixed cylinder are respectively fixedly connected to the top of the two bases;

[0007] The top of the secondary fixing cylinder is detachably connected to a disassembly cylinder by bolts. The cavity formed by the main fixing cylinder, the secondary fixing cylinder, and the disassembly cylinder is rotatably connected to two screws. The screws are segmented, and each screw segment is fixedly connected to a connecting block at its end. The screw segment end is provided with an opening that matches the connecting block. Multiple screw segments are connected end to end to form a screw by the insertion and engagement of the connecting block and the opening.

[0008] Preferably, the screw is composed of a drive screw, a first screw, and a second screw, and the outer thread density of the drive screw, the first screw, and the second screw gradually increases in the direction of material propulsion. The axial outer diameter of the drive screw, the first screw, and the second screw gradually increases to form a tapered structure, and the end of the screw is connected to an end block through a connecting block.

[0009] Preferably, the auxiliary fixing cylinder and the disassembly cylinder are detachably connected to the main fixing cylinder by bolts. The inner side of the end of the auxiliary fixing cylinder and the disassembly cylinder away from the main fixing cylinder is fixedly connected with symmetrically distributed limiting rings, and the two limiting rings are spliced ​​together to form a sleeve for axial limiting. The end block is rotatably connected inside the sleeve.

[0010] Preferably, the main fixed cylinder has a feed inlet on the side away from the auxiliary fixed cylinder at the top, and the drive screw is rotatably connected to the inside of the main fixed cylinder. The drive screw has an installation groove on its outer side, and drive plates are embedded in the installation grooves on the outer sides of the two drive screws.

[0011] Preferably, an adjusting bolt is fixedly connected to the end of the main fixed cylinder, and the adjusting bolt passes through the drive plate and is slidably connected thereto. A nut is threadedly connected to the outer side of the adjusting bolt, and the end face of the nut is in contact with the drive plate.

[0012] Preferably, a drive gear is fixedly connected to the end of the screw, and a drive assembly is slidably connected to the top of the base, with the drive gear meshing with the power output end of the drive assembly.

[0013] Preferably, the drive assembly has two symmetrically distributed guide grooves at the bottom, and two guide rails that are clearance-fitted with the guide grooves are fixedly connected to the top of the base. The drive assembly includes a gearbox and a drive motor, and the output shaft of the drive motor is connected to the input shaft of the gearbox.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This is a split-type conical twin-screw extruder tablet press. The screw is composed of multiple segmented screw sections connected by connecting blocks, which facilitates disassembly and replacement. The thread density and structural parameters of different screw sections can be designed or replaced according to material requirements, so as to realize the control of compression ratio and shear strength, meet the personalized requirements of plasticizing and compression processes of various materials, and improve the applicability and processing effect of the equipment.

[0016] The screw's axial outer diameter gradually increases to form a cone shape, while the radial space of the material channel gradually decreases, achieving a progressive compression effect. The drive screw can slide axially within the main fixed cylinder. Combined with the plug-in structure of the connecting block and the opening, the assembly gap is eliminated by axial preload, ensuring reliable connection and operational stability of the segmented screw sections and effectively avoiding mechanical vibration or wear caused by gaps. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the screw structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the secondary fixed cylinder structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the drive screw structure of this utility model;

[0022] Figure 6 This is a schematic diagram of the drive gear structure of this utility model.

[0023] In the diagram: 1. Base; 2. Main fixing cylinder; 3. Secondary fixing cylinder; 4. Disassembly cylinder; 5. Drive screw; 6. First screw; 7. Second screw; 8. Connecting block; 9. End block; 10. Limiting ring; 11. Feed port; 12. Mounting groove; 13. Drive plate; 14. Adjusting bolt; 15. Nut; 16. Drive gear; 17. Drive assembly. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1: Please refer to Figure 1 - Figure 4This utility model provides the following technical solution: a split-type conical twin-screw extruder tablet press, including a base 1, of which two bases 1 are provided, and a main fixed cylinder 2 and a secondary fixed cylinder 3 are respectively fixedly connected to the top of the two bases 1; a disassembly cylinder 4 is detachably connected to the top of the secondary fixed cylinder 3 by bolts, and two screws are rotatably connected inside the cavity formed by the main fixed cylinder 2, the secondary fixed cylinder 3, and the disassembly cylinder 4. The screws are of a segmented structure, and a connecting block 8 is fixedly connected to the end of each screw segment. The end of the screw segment is provided with an opening that matches the connecting block 8, and multiple screw segments are connected end to end to form a screw through the insertion and engagement of the connecting block 8 and the opening; the screws are made of The drive screw 5, the first screw 6, and the second screw 7 are composed of a drive screw 5, a first screw 6, and a second screw 7. The outer thread density of the drive screw 5, the first screw 6, and the second screw 7 gradually increases in the direction of material propulsion. The axial outer diameter of the drive screw 5, the first screw 6, and the second screw 7 gradually increases to form a tapered structure. The end of the screw is connected to an end block 9 through a connecting block 8. The auxiliary fixed cylinder 3 and the disassembly cylinder 4 are integrally connected to the main fixed cylinder 2 by bolts. The inner side of the auxiliary fixed cylinder 3 and the disassembly cylinder 4 away from the main fixed cylinder 2 is fixedly connected with symmetrically distributed limiting rings 10. The two limiting rings 10 are spliced ​​together to form a sleeve for axial limiting. The end block 9 is rotatably connected inside the sleeve.

[0026] During operation of this split-type conical twin-screw extruder tablet press, the material enters the continuous cavity formed by the main fixed cylinder 2, the auxiliary fixed cylinder 3, and the disassembly cylinder 4 through the feed port 11 at the top of the main fixed cylinder 2. After starting the drive assembly 17, the two conical screws rotate synchronously in opposite directions within the cavity. The drive screw 5, as the initial section, uses its relatively sparse threads to initially mix and convey the material. As the material advances towards the auxiliary fixed cylinder 3, passing sequentially through the first screw 6 and the second screw 7, the thread density increases gradually along the direction of advancement, and the axial outer diameter of the screws gradually increases to form a conical structure. This causes the radial space of the material channel to gradually shrink, resulting in a progressive compression effect.

[0027] The increasing thread density enhances the shearing effect per unit length. The annular gap formed by the conical screw and the inner wall of the fixed cylinder gradually narrows, generating an axial compressive force field. When the material reaches the sleeve area formed by the limiting ring 10, the rotational support of the end block 9 in the sleeve ensures stable operation of the screw end. At this time, the material has been plasticized and compressed into a dense sheet shape, and finally formed through the end extrusion channel.

[0028] When it is necessary to change the compression ratio or replace worn parts, the connecting bolts between the secondary fixed cylinder 3 and the main fixed cylinder 2 can be removed to separate the entire secondary fixed cylinder 3 from the disassembly cylinder 4 assembly. At this time, the segmented screw assembled by the drive screw 5, the first screw 6 and the second screw 7 through the connecting block 8 can be taken out axially. By replacing the first screw 6 and the second screw 7 with different thread parameters, the shear strength and compression gradient of each compression section can be adjusted. The axial sliding design of the drive screw 5 in the main fixed cylinder 2, combined with the plug-in structure of the connecting block 8 and the opening, can not only ensure the reliable connection of screw sections of different lengths, but also eliminate the assembly gap by applying axial preload.

[0029] Example 2: Based on Example 1, please refer to... Figure 5 and Figure 6 The following structure is also disclosed: A feed inlet 11 is provided on the side of the main fixed cylinder 2 away from the auxiliary fixed cylinder 3, and a drive screw 5 is rotatably connected inside the main fixed cylinder 2. An mounting groove 12 is provided on the outer side of the drive screw 5, and a drive plate 13 is embedded in the mounting groove 12 on the outer side of the two drive screws 5. An adjusting bolt 14 is fixedly connected to the end of the main fixed cylinder 2, and the adjusting bolt 14 passes through the drive plate 13 and is slidably connected to it. A nut 15 is threadedly connected to the outer side of the adjusting bolt 14, and the end face of the nut 15 is in contact with the drive plate 13. A drive gear 16 is fixedly connected to the end of the screw, and a drive assembly 17 is slidably connected to the top of the base 1, and the drive gear 16 meshes with the power output end of the drive assembly 17. Two symmetrically distributed guide grooves are provided at the bottom of the drive assembly 17, and two guide rails with clearance fit to the guide grooves are fixedly connected to the top of the base 1. The drive assembly 17 includes a gearbox and a drive motor, and the output shaft of the drive motor is connected to the input shaft of the gearbox.

[0030] When the first screw 6 and the second screw 7 of different specifications are replaced, the axial position of the drive plate 13 can be precisely controlled by rotating the nut 15 on the adjusting bolt 14. Since the drive plate 13 is embedded in the mounting groove 12 of the drive screw 5, its displacement directly pushes the drive screw 5 to slide in the main fixed cylinder 2, thereby automatically compensating for the assembly gap caused by the change in the length of the screw section. During the adjustment process, the drive gear 16 and the output end of the drive assembly 17 always maintain effective meshing.

[0031] The sliding support system of the drive assembly 17 consists of a bottom guide groove and a guide rail on the base 1. When the drive screw 5 moves axially, the drive assembly 17 can move synchronously along the guide rail to ensure the continuity of power transmission. The integrated design of the gearbox and the drive motor transmits the motor torque to the drive gear 16 after multi-stage reduction. Stable extrusion is achieved through the synchronous reverse rotation of the twin screws.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A split-type conical twin-screw extruder tablet press, comprising a base (1), wherein two bases (1) are provided, and a main fixed cylinder (2) and a secondary fixed cylinder (3) are respectively fixedly connected to the top of the two bases (1); Its features are: The top of the secondary fixing cylinder (3) is detachably connected to the disassembly cylinder (4) by bolts. The cavity formed by the main fixing cylinder (2), the secondary fixing cylinder (3) and the disassembly cylinder (4) is rotatably connected to two screws. The screws are segmented structures, and each screw segment is fixedly connected to a connecting block (8) at its end. The screw segment ends are provided with openings that match the connecting blocks (8). Multiple screw segments are connected end to end to form a screw through the insertion and engagement of the connecting blocks (8) and the openings.

2. The split-type conical twin-screw extruder tablet press according to claim 1, characterized in that: The screw is composed of a drive screw (5), a first screw (6), and a second screw (7). The outer thread density of the drive screw (5), the first screw (6), and the second screw (7) gradually increases in the direction of material propulsion. The axial outer diameter of the drive screw (5), the first screw (6), and the second screw (7) gradually increases to form a tapered structure. The end of the screw is connected to an end block (9) through a connecting block (8).

3. A split-type conical twin-screw extruder tablet press according to claim 2, characterized in that: The auxiliary fixing cylinder (3) and the disassembly cylinder (4) are detachably connected to the main fixing cylinder (2) by bolts. The inner side of the auxiliary fixing cylinder (3) and the disassembly cylinder (4) away from the main fixing cylinder (2) is fixedly connected with symmetrically distributed limiting rings (10), and the two limiting rings (10) are spliced ​​together to form a sleeve for axial limiting. The end block (9) is rotatably connected to the inside of the sleeve.

4. A split-type conical twin-screw extruder tablet press according to claim 3, characterized in that: The main fixed cylinder (2) has a feed inlet (11) on the side away from the auxiliary fixed cylinder (3) at the top, and the drive screw (5) is rotatably connected to the inside of the main fixed cylinder (2). The drive screw (5) has an installation groove (12) on the outside, and the drive plate (13) is embedded in the installation groove (12) on the outside of the two drive screws (5).

5. A split-type conical twin-screw extruder tablet press according to claim 4, characterized in that: The main fixed cylinder (2) is fixedly connected to an adjusting bolt (14) at its end, and the adjusting bolt (14) passes through the drive plate (13) and is slidably connected to it. The adjusting bolt (14) is threaded with a nut (15) on its outer side, and the end face of the nut (15) is in contact with the drive plate (13).

6. A split-type conical twin-screw extruder tablet press according to claim 1, characterized in that: The screw end is fixedly connected to a drive gear (16), and the top of the base (1) is slidably connected to a drive assembly (17), and the drive gear (16) is meshed with the power output end of the drive assembly (17).

7. A split-type conical twin-screw extruder tablet press according to claim 6, characterized in that: The drive assembly (17) has two symmetrically distributed guide grooves at the bottom, and the base (1) has two guide rails that are in clearance fit with the guide grooves fixedly connected to the top. The drive assembly (17) includes a gearbox and a drive motor, and the output shaft of the drive motor is connected to the input shaft of the gearbox.

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