Twin-screw extrusion tablet press
By introducing a control assembly consisting of a rotating plate and a push rod into a twin-screw extruder tablet press, the problems of uneven material distribution and insufficient filling rate are solved, thereby improving material uniformity and extrusion efficiency, extending equipment life, and reducing energy consumption and noise.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUNAN HENGXINWEI TECHNOLOGY CO LTD
- Filing Date
- 2025-05-23
- Publication Date
- 2026-04-17
AI Technical Summary
When materials enter the screw, they tend to concentrate in the middle of the feed inlet due to gravity, resulting in uneven load on the twin screws, accelerating screw wear and affecting the quality of extruded products. Traditional feeding structures lack an active flow guiding mechanism, and when the material filling rate is insufficient, idling is likely to occur, limiting the improvement of equipment capacity.
The control assembly consists of a rotating plate and a push rod. The servo motor drives the gear to rotate the extrusion screw, and the eccentric plate and synchronous belt transmission mechanism realize the active guidance and vibration flow of the material. Combined with the modular design of the control assembly, the material filling rate and uniformity are improved, and the energy consumption and noise of the equipment are reduced.
It significantly improves material filling rate by more than 30%, enhances twin-screw load uniformity by 45%, extends screw life, increases extrusion capacity by 25%, improves product surface finish, reduces equipment energy consumption by 18%, and reduces noise to below 75dB.
Smart Images
Figure CN224130411U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of extrusion tableting machine technology, and in particular to a twin-screw extrusion tableting machine. Background Technology
[0002] Twin-screw extrusion technology, as a core process in polymer material processing, is widely used in the molding of rubber, plastics, and composite materials. Although traditional twin-screw extrusion equipment has achieved continuous production, the following technical bottlenecks still exist in practical applications:
[0003] Uneven material distribution: When the material enters the screw, it tends to concentrate in the middle of the feed inlet due to gravity, resulting in uneven load on the twin screws, accelerating screw wear and affecting the quality of extruded products.
[0004] Extrusion efficiency is limited: Traditional feeding structures lack an active flow guiding mechanism, and when the material filling rate is insufficient, idling is likely to occur, which limits the improvement of equipment capacity.
[0005] To address the aforementioned problems, this utility model proposes a twin-screw extrusion tablet press. Utility Model Content
[0006] The purpose of this invention is to solve the problems of uneven material distribution in the existing technology: when the material enters the screw, it tends to concentrate in the middle of the feed inlet due to gravity, resulting in uneven load on the twin screws, accelerating screw wear and affecting the quality of extruded products, and limiting extrusion efficiency; the traditional feeding structure lacks an active flow guiding mechanism, and when the material filling rate is insufficient, it is easy to produce idling phenomenon, which limits the improvement of equipment capacity. Therefore, a twin screw extrusion tablet press is proposed.
[0007] To achieve the above objectives, the present invention adopts the following technical solution:
[0008] A twin-screw extruder tablet press includes a worktable, a protective shell fixedly connected to the top of the worktable, the interior of the protective shell being a cavity, a connecting pipe fixedly connected to the top of the protective shell, a feed hopper fixedly connected to the top of the connecting pipe, the feed hopper communicating with the connecting pipe, a feed chute being provided inside the feed hopper for material entry, a material pipe fixedly passing through the interior of the protective shell, and an extrusion assembly for extruding material being provided inside the material pipe;
[0009] The feed hopper is equipped with a control component for controlling the position of the material entering.
[0010] In one possible design, the extrusion assembly includes a sealing baffle fixedly connected to one end of the feed tube. Two symmetrically arranged extrusion screws are rotatably connected to one side of the sealing baffle. A round rod is fixedly connected to one end of each extrusion screw. One end of the round rod rotatably passes through the sealing baffle. A gear is fixedly sleeved on the outer wall of the round rod. The two gears mesh with each other. A rectangular hole is opened at the top of the feed tube. The rectangular hole is fixedly connected to the bottom of the connecting tube.
[0011] In one possible design, the control assembly includes a fixed strip plate fixedly connected between the inner walls of both sides of the feed chute, with a rotating rod rotatably passing through the interior of the fixed strip plate, and a rotating plate fixedly sleeved on the outer wall of the rotating rod. A feed hole is provided on the bottom inner wall of the feed chute, and the rotating plate is located above the feed hole.
[0012] In one possible design, a fixed plate is fixedly connected to one side of the top of the workbench, and a servo motor is fixedly connected to one side of the fixed plate. The output shaft of the servo motor is fixedly connected to one end of one of the round rods.
[0013] In one possible design, two symmetrically arranged push rods slide through one side of the feed hopper, one end of each push rod is fixedly connected to a limiting plate, one side of the limiting plate and one side of the feed hopper are fixedly connected to the same spring, and one end of each push rod abuts against both sides of the rotating plate.
[0014] In one possible design, the interior of the fixed plate is rotatably traversed by a second rotating shaft, one end of which is fixedly connected to an eccentric plate, and one side of the eccentric plate is fixedly connected to a pushing block, which is used in conjunction with two limiting plates.
[0015] In one possible design, one end of a rod of the servo motor is fixedly connected to a first rotating shaft, and the outer walls of both the first and second rotating shafts are fixedly fitted with synchronous pulleys, with the outer walls of the two synchronous pulleys being fitted with the same synchronous belt.
[0016] In this application, during use, the material to be extruded is fed into the inside of the feed hopper, and enters the inside of the feed hole through the inclined surface of the feed chute, and then enters the inside of the feed pipe through the connecting pipe and the rectangular hole. The servo motor is started, and the output shaft of the servo motor drives one of the gears to rotate. Through the meshing of the two gears, the two extrusion screws can be driven to rotate. The two extrusion screws extrude the material and, in conjunction with the corresponding mold, complete the extrusion process.
[0017] Simultaneously, when the gear rotates, it can drive the first rotating shaft to rotate. The first rotating shaft can drive the second rotating shaft above to rotate through the synchronous pulley and synchronous belt. The second rotating shaft drives the eccentric plate to rotate, and the eccentric plate drives the push block to rotate. The inclined surface of the push block continuously contacts the two limiting plates alternately. The limiting plates will drive the push rod to move laterally, and the spring will be squeezed. The alternately extended push rod will continuously push the two sides of the rotating plate, thereby causing the rotating plate to swing around the rotating rod. Since the rotating plate is located inside the feed chute and above the feed hole, the rotating plate will guide the material entering the feed hole to the left and right, so that the material can cooperate with the two extrusion screws when it enters, which facilitates the subsequent material extrusion process.
[0018] Beneficial effects: Through the reciprocating oscillation design of the rotating plate, the material is actively guided to the meshing area of the twin screw when it enters the feed hole, which increases the material filling rate by more than 30%, improves the load uniformity of the twin screw by 45%, and significantly extends the screw service life.
[0019] The vibrating flow guide structure effectively breaks up bridging of powdery materials, increasing extrusion capacity by 25% and improving product surface smoothness for difficult-to-flow materials such as PVC.
[0020] By adopting a synchronous pulley and synchronous belt drive mechanism, the rotational power of the extrusion screw is directly transmitted to the eccentric plate, realizing "zero additional energy consumption" vibration feeding, and reducing the overall energy consumption of the equipment by 18%.
[0021] The modularly designed control components (rotating plate, push rod, etc.) can be disassembled independently, reducing maintenance time to 1 / 3 of that of traditional structures;
[0022] There is friction between the push rod and the feed hopper, which, together with the buffer mechanism consisting of the spring and the limit plate, effectively absorbs vibration and shock, reducing the operating noise of the equipment to below 75dB, which meets the industrial-grade quiet standard. Attached Figure Description
[0023] Figure 1 This is a three-dimensional structural schematic diagram of a twin-screw extrusion tablet press proposed in this utility model;
[0024] Figure 2 This is a three-dimensional structural diagram from a second perspective of a twin-screw extrusion tablet press proposed in this utility model;
[0025] Figure 3 This is a three-dimensional structural diagram of the extrusion screw in a twin-screw extrusion tablet press proposed in this utility model;
[0026] Figure 4 This is a three-dimensional cross-sectional view of the feed hopper and protective shell in a twin-screw extrusion tablet press proposed in this utility model.
[0027] Figure 5This is a three-dimensional structural diagram of the push block and rotating plate in a twin-screw extrusion tablet press proposed in this utility model.
[0028] In the diagram: 1. Workbench; 2. Protective shell; 3. Feed chute; 4. Feed hopper; 5. Fixed plate; 6. Gear; 7. Servo motor; 8. First rotating shaft; 9. Extrusion screw; 10. Rectangular hole; 11. Material tube; 12. Sealing baffle; 13. Second rotating shaft; 14. Synchronous pulley; 15. Synchronous belt; 16. Connecting pipe; 17. Eccentric plate; 18. Push block; 19. Push rod; 20. Fixed strip plate; 21. Rotating rod; 22. Rotating plate; 23. Spring; 24. Limiting plate; 25. Feed hole. Detailed Implementation
[0029] 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.
[0030] Example 1
[0031] Reference Figure 1-5 An extrusion tablet press includes a worktable 1. A protective shell 2 is fixedly connected to the top of the worktable 1. The interior of the protective shell 2 is hollow. A connecting pipe 16 is fixedly connected to the top of the protective shell 2. A feed hopper 4 is fixedly connected to the top of the connecting pipe 16. The feed hopper 4 is connected to the connecting pipe 16. A feed chute 3 is opened inside the feed hopper 4 for material to enter. A material pipe 11 is fixedly inserted inside the protective shell 2. An extrusion assembly for extruding material is arranged inside the material pipe 11. The extrusion assembly includes a sealing baffle 12 fixedly connected to one end of the material pipe 11. Two symmetrically arranged extrusion screws 9 are rotatably connected to one side of the sealing baffle 12. A round rod is fixedly connected to one end of the extrusion screw 9. The end rotates through the sealing baffle 12. Gears 6 are fixedly sleeved on the outer wall of the round rod. The two gears 6 on the two round rods mesh with each other. A rectangular hole 10 is opened at the top of the material tube 11. The rectangular hole 10 is fixedly connected to the bottom of the connecting pipe 16. The material to be extruded is put into the inside of the feeding hopper 4 and enters the inside of the feeding hole 25 through the inclined surface of the feeding chute 3. Then it enters the inside of the material tube 11 through the connecting pipe 16 and the rectangular hole 10. The servo motor 7 is started. The output shaft of the servo motor 7 drives one of the gears 6 to rotate. Since the gears 6 on the two round rods mesh with each other, they can drive the two extrusion screws 9 to rotate. The two extrusion screws 9 extrude the material and cooperate with the corresponding mold to complete the extrusion process.
[0032] The cross-sectional shape of the feed chute 3 can be: 1. Hyperbolic flared type: inlet width W1 = 150mm, outlet width W2 = 80mm, contraction angle γ = 25°; 2. Stepped guide channel: set 2-3 steps with a height difference Δh = 10mm to form a material pre-compression zone.
[0033] The feed hopper 4 is equipped with a control component for controlling the material entry position. The control component includes a fixed strip plate 20 fixedly connected between the inner walls of both sides of the feed chute 3. A rotating rod 21 is rotatably passed through the inside of the fixed strip plate 20. A rotating plate 22 is fixedly sleeved on the outer wall of the rotating rod 21. A feed hole 25 is opened on the bottom inner wall of the feed chute 3. The rotating plate 22 is located above the feed hole 25. A fixed plate 5 is fixedly connected to one side of the top of the workbench 1. A servo motor 7 is fixedly connected to one side of the fixed plate 5. The output shaft of the servo motor 7 is fixedly connected to one end of one of the round rods. Obviously, the connection method can adopt a variety of connection structures, such as couplings, direct connection, etc. In this embodiment, a coupling is used. In order to adjust the speed, the output shaft of the servo motor 7 is connected to a reducer (not shown in the figure). The output shaft of the reducer is fixedly connected to the round rod through the coupling.
[0034] Two symmetrically arranged push rods 19 slide through one side of the feed hopper 4. One end of the push rod 19 is fixedly connected to a limit plate 24. A spring 23 is fixedly connected between one side of the limit plate 24 and one side of the feed hopper 4. The other end of the push rod 19 abuts against both sides of the rotating plate 22. A second rotating shaft 13 rotates through the interior of the fixed plate 5. An eccentric plate 17 is fixedly connected to one end of the second rotating shaft 13. A push block 18 is fixedly connected to one side of the eccentric plate 17. The push block 18 works in conjunction with the two limit plates 24. At the same time, when the gear 6 rotates, it can drive the first rotating shaft 8 to rotate. The first rotating shaft 8 can drive the upper second rotating shaft 8 through the synchronous pulley 14 and the synchronous belt 15. The rotating shaft 13 rotates, and the second rotating shaft 13 drives the eccentric plate 17 to rotate. The eccentric plate 17 drives the push block 18 to rotate. The inclined surface of the push block 18 continuously contacts the two limiting plates 24 alternately. The limiting plates 24 will drive the push rod 19 to move laterally. The spring 23 is squeezed. The alternately extended push rod 19 will continuously push the two sides of the rotating plate 22, thereby causing the rotating plate 22 to swing around the rotating rod 21. Since the rotating plate 22 is located inside the feed chute 3 and above the feed hole 25, the rotating plate 22 will guide the material entering the feed hole 25 to the left and right, so that the material can cooperate with the two extrusion screws 9 when it enters, which will facilitate the subsequent material extrusion process.
[0035] This application can be used in the field of extrusion tablet presses, or in other fields applicable to this application.
[0036] Example 2
[0037] refer to Figure 1-5 An improvement based on Example 1: A twin-screw extrusion tablet press, which is applied to the field of extrusion tablet presses, wherein one end of a round rod of a servo motor 7 is fixedly connected to a first rotating shaft 8, and the outer walls of the first rotating shaft 8 and the second rotating shaft 13 are both fixedly fitted with synchronous pulleys 14, and the outer walls of the two synchronous pulleys 14 are fitted with the same synchronous belt 15.
[0038] However, as is well known to those skilled in the art, the working principle and wiring method of the servo motor 7 are commonplace and are all conventional methods or common knowledge, so they will not be described in detail here. Those skilled in the art can make any selections according to their needs or convenience.
[0039] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.
[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A double screw extrusion tablet press, comprising a workbench (1), the top of the workbench (1) is fixedly connected with a protective shell (2), the inside of the protective shell (2) is provided with a cavity, characterized in that, Also includes: The top of the protective shell (2) is fixedly connected to a connecting pipe (16), and the top of the connecting pipe (16) is fixedly connected to a feeding hopper (4). The feeding hopper (4) is connected to the connecting pipe (16). The inside of the feeding hopper (4) is provided with a feeding chute (3). The feeding chute (3) is used for material to enter. The inside of the protective shell (2) is fixedly connected to a material pipe (11). The inside of the material pipe (11) is provided with an extrusion assembly for extruding materials. The feed hopper (4) is equipped with a control component for controlling the entry position of materials.
2. A twin-screw extrusion press according to claim 1, characterized in that, The extrusion assembly includes a sealing baffle (12) fixedly connected to one end of the feed tube (11). Two symmetrically arranged extrusion screws (9) are rotatably connected to one side of the sealing baffle (12). A round rod is fixedly connected to one end of the extrusion screw (9). One end of the round rod rotatably passes through the sealing baffle (12). A gear (6) is fixedly sleeved on the outer wall of the round rod. The two gears (6) mesh with each other. A rectangular hole (10) is opened at the top of the feed tube (11). The rectangular hole (10) is fixedly connected to the bottom of the connecting tube (16).
3. A twin-screw extrusion press according to claim 1, characterized in that, The control component includes a fixed strip plate (20) fixedly connected between the inner walls of both sides of the feed chute (3). A rotating rod (21) is rotatably passed through the inside of the fixed strip plate (20). A rotating plate (22) is fixedly sleeved on the outer wall of the rotating rod (21). A feed hole (25) is opened on the bottom inner wall of the feed chute (3). The rotating plate (22) is located above the feed hole (25).
4. A twin-screw extrusion press according to claim 2, characterized in that, A fixing plate (5) is fixedly connected to one side of the top of the workbench (1), and a servo motor (7) is fixedly connected to one side of the fixing plate (5). The output shaft of the servo motor (7) is fixedly connected to one end of one of the round rods.
5. A twin-screw extrusion press according to claim 4, characterized in that, Two symmetrically arranged push rods (19) slide through one side of the feed hopper (4). One end of the push rod (19) is fixedly connected to a limiting plate (24). One side of the limiting plate (24) and one side of the feed hopper (4) are fixedly connected to the same spring (23). One end of the push rod (19) abuts against both sides of the rotating plate (22).
6. A twin-screw extrusion press according to claim 5, characterized in that, The fixed plate (5) has a second rotating shaft (13) that rotates through it. One end of the second rotating shaft (13) is fixedly connected to an eccentric plate (17). One side of the eccentric plate (17) is fixedly connected to a push block (18). The push block (18) is used in conjunction with two limiting plates (24).
7. A twin-screw extrusion press according to claim 5, characterized in that, One end of a round rod away from the servo motor (7) is fixedly connected to a first rotating shaft (8). The outer walls of the first rotating shaft (8) and the second rotating shaft (13) are both fixedly fitted with synchronous pulleys (14), and the outer walls of the two synchronous pulleys (14) are fitted with the same synchronous belt (15).