Miniature active back-twin-cone twin-screw extruder
By adopting an independent conical twin-screw structure and a dual-outlet reversing regulating valve assembly, the problems of uneven material mixing and reflux residue in conical twin-screw extruders are solved, achieving efficient material circulation and discharge control, and improving product quality and production stability.
Patent Information
- Application Number
- CN202522589329.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-05
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-12-05
AI Technical Summary
Existing conical twin-screw extruders suffer from uneven mixing and difficulty in cleaning residual material in the return channel when processing polymers with different flowability, which affects product quality and production continuity.
The system employs two independent conical twin-screw structures with a coplanar, inverted, and staggered layout. Combined with a closed-loop circulation channel connected end to end and a dual-outlet reversing regulating valve assembly, it enables the material to actively and infinitely reciprocate and precisely reverse, ensuring that the material flows without stagnation under the thrust of the screws and completely solving the problem of residual material in the return channel.
It achieves uniform dispersion and mixing of polymer materials, avoids raw material waste and material aging, and ensures product quality stability and production continuity.
Smart Images
Figure CN224928470U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of polymer material testing equipment, and in particular to a micro active reciprocating double cone twin screw extruder. Background Technology
[0002] In the field of polymer material processing, extruders are the core equipment for realizing material mixing, plasticizing and molding. Among them, conical twin-screw extruders are widely used in the processing and production of various polymer materials due to their strong shearing and conveying capabilities.
[0003] Currently, mainstream conical twin-screw extruders on the market typically only have one pair of conical screws. Their circulating mixing structure design is relatively simple, mostly using a basic reflux channel within the cavity, combined with a switching valve, to achieve material circulation mixing or discharge within the cavity. However, these traditional devices have significant technical drawbacks in practical applications: Firstly, the fluidity of polymer materials in the molten state fluctuates significantly due to differences in material properties and formulation components. The existing simple reflux channel structure is difficult to adapt to materials with different fluidities, failing to ensure uniform distribution and sufficient reflux during circulation, resulting in poor mixing and plasticizing effects and affecting the final product quality. Secondly, when switching to discharge mode via the switching valve, the reflux channel closes, but at this time, some molten material often remains inside the reflux channel. This residual material is difficult to clean, not only wasting raw materials but also potentially aging and degrading due to prolonged retention, thus contaminating subsequent processed materials and affecting production continuity and product stability.
[0004] Therefore, there is an urgent need for an extruder structure that can adapt to materials with different flowability, ensure the effect of reflux circulation, and avoid material residue in the reflux channel, so as to solve the above-mentioned problems existing in the prior art. Utility Model Content
[0005] The purpose of this invention is to provide a miniature active reciprocating twin-cone twin-screw extruder to solve the problems mentioned in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution, which includes an installation table, a number of columns on the top of the installation table, an installation top plate on the top of the columns, a lower cavity on the top of the installation top plate, double conical screw power assemblies on both sides of the installation top plate, a pushing component of the double conical screw power assembly being movably disposed in the lower cavity, and a dual-outlet reversing regulating valve assembly at the bottom of the installation top plate.
[0007] Preferably, the lower cavity is provided with a first double-conical cavity and a second double-conical cavity, which are symmetrically arranged in opposite directions. The tail end of the first double-conical cavity is connected to the top end of the second double-conical cavity through a first circulating connection channel, and the top end of the first double-conical cavity is connected to the tail end of the second double-conical cavity through a second circulating connection channel. A parabolic smooth discharge channel is provided on the side of the top end of the first double-conical cavity away from the second circulating connection channel, and the parabolic smooth discharge channel is connected to the discharge port of the lower cavity.
[0008] Preferably, the double-cone screw power assembly includes a reducer mounted on a mounting plate, a drive motor mounted on the reducer, the transmission end of the drive motor being connected to the input end of the reducer, a double-output shaft gearbox being mounted in front of the reducer, the output end of the reducer being connected to the input end of the double-output shaft gearbox via a coupling, and a conical screw being mounted on each of the two output ends of the double-output shaft gearbox, with the two sets of conical screws respectively movably mounted in a first double-cone cavity and a second double-cone cavity.
[0009] Preferably, a mounting block is provided at the top rear of the mounting plate, a shaft is provided on the back of the mounting block, an opening and closing cover is movably provided on the shaft, an upper cavity is provided inside the opening and closing cover corresponding to the position of the lower cavity, a third double-cone cavity corresponding to the first double-cone cavity is opened in the upper cavity, a fourth double-cone cavity corresponding to the second double-cone cavity is opened in the upper cavity, and a feed hole communicating with the third double-cone cavity is simultaneously opened on the opening and closing cover and the upper cavity.
[0010] Preferably, the dual-outlet reversing regulating valve assembly includes a pair of inverted L-shaped fixing seats disposed at the bottom of the mounting top plate, a shaft is disposed between the two inverted L-shaped fixing seats, a lever plate is disposed on the shaft, a pair of push-pull rods are movably disposed on the lever plate, the two push-pull rods are disposed on both sides of the shaft, and the top of the two push-pull rods are respectively provided with a backflow obstruction valve plate and a discharge obstruction valve plate, telescopic holes are opened in both the second circulation connection channel and the parabolic smooth discharge channel, the two push-pull rods are respectively movably disposed in the two telescopic holes, the backflow obstruction valve plate is disposed in the second circulation connection channel, the discharge obstruction valve plate is disposed in the parabolic smooth discharge channel, a reciprocating push-pull electromagnet is disposed on the top of the mounting table, a connector is disposed at the top of the reciprocating push-pull electromagnet, and the connector is movably connected to one end of the lever plate.
[0011] Preferably, the drive components of the double-cone screw power assembly on both sides are covered with protective shells, one of the protective shells is provided with a control panel, and the front of the mounting table is provided with a protective baffle, which is located between the two protective shells.
[0012] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial technical effects:
[0013] 1. This utility model adopts two sets of independent conical twin-screw structures with a front-to-back coplanar inverted and staggered layout, combined with a closed circulation channel connected end to end, to realize the active and infinite reciprocating circulation of materials. Compared with the passive circulation mode of traditional single screw + simple return channel, the material is continuously circulated and propelled along the prescribed path under the drive of two sets of independent power systems, with no dead corners in the circulation. It can fully withstand the shearing, kneading and conveying effects of twin screws. The dispersion and uniformity of polymer materials are significantly better than traditional equipment, completely solving the industry pain point of "insufficient local mixing".
[0014] 2. Both sets of conical screws in this utility model adopt a large-end inlet and small-end outlet propulsion method. Combined with an independently adjustable power system, the rotational speed matching degree of the two sets of screws can be flexibly adjusted according to the differences in the fluidity of the material in the molten state (such as high-viscosity PE, low-viscosity PVC and various modified formulation materials). By changing the material circulation propulsion speed and shear strength, it is ensured that the material can flow stably and mix fully in the circulation channel regardless of its fluidity, thus completely overcoming the defects of traditional simple return channels that are "poorly adaptable and fail to circulate when fluidity fluctuates".
[0015] 3. The circulation channel of this utility model is perfectly matched with the propulsion path of the two sets of screws, and the material flows without stagnation under the active thrust of the screws. At the same time, the dual-outlet reversing regulating valve assembly achieves precise reversal between the circulation channel and the discharge channel through synchronous switching of valve plates. When switching to the discharge mode, the material in the return channel will be pushed to the discharge channel by the thrust of the subsequent propulsion material, leaving no dead corners. When switching to the circulation mode, the discharge channel valve plate closes, and the material seamlessly enters the circulation path, completely solving the problem of "residual material cannot be cleaned after the return channel is closed" in traditional equipment. This avoids raw material waste and eliminates the risk of residual material aging and degrading and contaminating subsequent processed materials, ensuring product quality stability. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0017] Figure 2 This is a schematic diagram of the structure of this utility model when both protective shells are completely removed;
[0018] Figure 3 This is a schematic diagram of the double-cone screw power assembly structure of this utility model;
[0019] Figure 4 This is a structural schematic diagram of the mounting table, lower cavity, and upper cavity of this utility model;
[0020] Figure 5 for Figure 4 Enlarged view of point A in the middle;
[0021] Figure 6 This is a schematic diagram of the dual-outlet reversing regulating valve assembly of this utility model.
[0022] Reference numerals: 1. Mounting table; 10. Column; 11. Mounting top plate; 12. Mounting block; 13. Shaft; 14. Opening / closing cover; 2. Lower cavity; 20. First double-conical cavity; 21. Second double-conical cavity; 22. Circulation connection channel one; 23. Circulation connection channel two; 24. Parabolic smooth discharge channel; 25. Discharge port; 26. Telescopic hole; 3. Upper cavity; 30. Third double-conical cavity; 31. Fourth double-conical cavity; 32. Inlet hole; 4. Double-conical screw power assembly; 40. Drive motor; 41. Reducer; 42. Double output shaft gearbox; 43. Conical screw; 44. Coupling; 5. Double outlet reversing regulating valve assembly; 50. Inverted L-shaped fixing seat; 51. Shaft; 52. Lever plate; 53. Push-pull rod; 54. Backflow obstruction valve; 55. Discharge obstruction valve; 56. Reciprocating push-pull electromagnet; 57. Connector; 6. Protective shell; 7. Control panel; 8. Protective baffle. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.
[0024] like Figure 1-6 As shown, this utility model proposes a miniature active reciprocating double-cone twin-screw extruder, which includes a horizontally arranged mounting table 1. Four columns 10 are vertically fixed at the four corners of the top of the mounting table 1. The top of the four columns 10 is fixed to a horizontal mounting top plate 11, forming a stable frame support structure. A lower cavity 2 is assembled on the top of the mounting top plate 11. Two sets of double-cone screw power assemblies 4 are symmetrically arranged on the left and right sides of the mounting top plate 11. The power output components of the two sets of double-cone screw power assemblies 4 are movably inserted into the lower cavity 2. A dual-outlet reversing regulating valve assembly 5 is installed at the bottom of the mounting top plate 11 to control the circulation or discharge state of the material. The drive components of the double-cone screw power assemblies 4 on both sides are covered with protective shells 6. A control panel 7 is fixed to the outer side of one of the protective shells 6. A protective baffle 8 is detachably installed on the front of the mounting table 1. The protective baffle 8 is located between the two protective shells 6 to form a safety protection area.
[0025] The lower cavity 2 is a hollow, sealed structure. It has a first double-cone cavity 20 and a second double-cone cavity 21 integrally formed inside. The first double-cone cavity 20 and the second double-cone cavity 21 are arranged symmetrically with opposite orientations (i.e., the large end and the small end are opposite to each other). The tail end (large end) of the first double-cone cavity 20 is sealed and connected to the top end (small end) of the second double-cone cavity 21 through a circulation connection channel 1 22. The top end (small end) of the first double-cone cavity 20 is sealed and connected to the tail end (large end) of the second double-cone cavity 21 through a circulation connection channel 23, forming a closed circulation channel. A parabolic smooth discharge channel 24 is opened on the side of the top of the first double-cone cavity 20 away from the circulation connection channel 23. The bottom end of the parabolic smooth discharge channel 24 is sealed and connected to the discharge port 25 of the lower cavity 2, ensuring smooth material discharge without stagnation.
[0026] The double-cone screw power assembly 4 includes a reducer 41 fixed on the mounting plate 11. The input end of the reducer 41 is connected to a drive motor 40 via a coupling 44. A double-output shaft gearbox 42 is fixed in front of the reducer 41. The output end of the reducer 41 is connected to the input end of the double-output shaft gearbox 42 via a coupling 44. Both output ends of the double-output shaft gearbox 42 are connected to conical screws 43. The two sets of conical screws 43 are respectively movably inserted into the first double-cone cavity 20 and the second double-cone cavity 21. The taper of the conical screws 43 is adapted to the taper of the corresponding cavity to ensure that the material can be stably pushed from the large end to the small end of the screw. The two sets of double-cone screw power assemblies 4 are independently controlled and the speed can be adjusted according to the mixing requirements.
[0027] A mounting block 12 is welded to the rear of the top plate 11. A shaft 13 is movably inserted through the back of the mounting block 12 via a bearing. An opening and closing cover 14 is fixedly sleeved on the shaft 13. The opening and closing cover 14 can be rotated around the shaft 13 to open and close. An upper cavity 3 is provided on the inner side of the opening and closing cover 14 corresponding to the position of the lower cavity 2. A third double conical cavity 30 matching the first double conical cavity 20 and a fourth double conical cavity 31 matching the second double conical cavity 21 are opened in the upper cavity 3. A feed hole 32 communicating with the third double conical cavity 30 is opened on both the opening and closing cover 14 and the upper cavity 3. The material enters the cavity system through the feed hole 32 to participate in the mixing cycle.
[0028] The dual-outlet reversing regulating valve assembly 5 includes a pair of inverted L-shaped fixing seats 50 located at the bottom of the mounting top plate 11. A shaft 51 passes between the two inverted L-shaped fixing seats 50. A lever plate 52 is fixedly sleeved on the shaft 51. A pair of push-pull rods 53 are movably connected to the lever plate 52. The push-pull rods 53 are located on both sides of the shaft 51, and a backflow obstruction valve plate 54 and a discharge obstruction valve plate 55 are respectively fixed to the top of the two push-pull rods 53. Expansion holes 26 adapted to the push-pull rods 53 are opened in both the second circulation connection channel 23 and the parabolic smooth discharge channel 24. The two push-pull rods 53 can move independently. The return flow obstruction valve plate 54 is adapted to be installed in the second circulation connection channel 23, which is inserted into the two telescopic holes 26. The discharge flow obstruction valve plate 55 is adapted to be installed in the parabolic smooth discharge channel 24. The top of the mounting table 1 is bolted with a reciprocating push-pull electromagnet 56. The top of the reciprocating push-pull electromagnet 56 is provided with a connector 57. The connector 57 is movably connected to one end of the lever plate 52 through a pin. The extension and retraction of the reciprocating push-pull electromagnet 56 drives the lever plate 52 to rotate around the shaft 51, thereby driving the two sets of valve plates to switch the opening and closing states synchronously, realizing the reversal control of material circulation and discharge.
[0029] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.
Claims
1. A miniature active reciprocating twin-cone twin-screw extruder, comprising a mounting table (1), wherein a plurality of columns (10) are provided on the top of the mounting table (1), and a mounting top plate (11) is provided on the top of the plurality of columns (10), characterized in that: The top of the mounting plate (11) is provided with a lower cavity (2), and both sides of the mounting plate (11) are provided with a double cone screw power assembly (4). The pushing component of the double cone screw power assembly (4) is movably arranged in the lower cavity (2), and the bottom of the mounting plate (11) is provided with a double outlet reversing regulating valve assembly (5).
2. The miniature active reciprocating twin-cone twin-screw extruder according to claim 1, characterized in that: The lower cavity (2) is provided with a first double-cone cavity (20) and a second double-cone cavity (21). The first double-cone cavity (20) and the second double-cone cavity (21) are arranged symmetrically with opposite orientations. The tail end of the first double-cone cavity (20) is connected to the top end of the second double-cone cavity (21) through a first circulating connection channel (22). The top end of the first double-cone cavity (20) is connected to the tail end of the second double-cone cavity (21) through a second circulating connection channel (23). A parabolic smooth discharge channel (24) is opened on the side of the top end of the first double-cone cavity (20) away from the second circulating connection channel (23). The parabolic smooth discharge channel (24) is connected to the discharge port (25) of the lower cavity (2).
3. A miniature active reciprocating twin-cone twin-screw extruder according to claim 2, characterized in that: The double conical screw power assembly (4) includes a reducer (41) mounted on the mounting top plate (11). A drive motor (40) is mounted on the reducer (41). The transmission end of the drive motor (40) is connected to the input end of the reducer (41). A double output shaft gearbox (42) is mounted in front of the reducer (41). The output end of the reducer (41) is connected to the input end of the double output shaft gearbox (42) via a coupling (44). Both output ends of the double output shaft gearbox (42) are provided with conical screws (43). The two sets of conical screws (43) are respectively movably mounted in the first double conical cavity (20) and the second double conical cavity (21).
4. A miniature active reciprocating twin-cone twin-screw extruder according to claim 2, characterized in that: An installation block (12) is provided at the rear of the top of the mounting plate (11). A shaft (13) is provided on the back of the installation block (12). An opening and closing cover (14) is movably provided on the shaft (13). An upper cavity (3) is provided inside the opening and closing cover (14) at the position corresponding to the lower cavity (2). A third double conical cavity (30) corresponding to the first double conical cavity (20) is opened inside the upper cavity (3). A fourth double conical cavity (31) corresponding to the second double conical cavity (21) is opened inside the upper cavity (3). A feed hole (32) communicating with the third double conical cavity (30) is opened on both the opening and closing cover (14) and the upper cavity (3).
5. A miniature active reciprocating twin-cone twin-screw extruder according to claim 2, characterized in that: The dual-outlet reversing regulating valve assembly (5) includes a pair of inverted L-shaped fixing seats (50) disposed at the bottom of the mounting top plate (11), a shaft (51) is disposed between the two inverted L-shaped fixing seats (50), a lever plate (52) is disposed on the shaft (51), a pair of push-pull rods (53) are movably disposed on the lever plate (52), the two push-pull rods (53) are disposed on both sides of the shaft (51), and a backflow obstruction valve plate (54) and a discharge obstruction valve plate (55) are respectively disposed at the top of the two push-pull rods (53), and the second circulation connection channel (23) Both the parabolic smooth discharge channel (24) and the parabolic smooth discharge channel (24) are provided with telescopic holes (26). The two push-pull rods (53) are respectively movably installed in the two telescopic holes (26). The backflow obstruction valve plate (54) is installed in the second circulation connection channel (23). The discharge obstruction valve plate (55) is installed in the parabolic smooth discharge channel (24). The top of the mounting table (1) is provided with a reciprocating push-pull electromagnet (56). The top of the reciprocating push-pull electromagnet (56) is provided with a connector (57). The connector (57) is movably connected to one end of the lever plate (52).
6. A miniature active reciprocating twin-cone twin-screw extruder according to claim 1, characterized in that: The drive components of the double conical screw power assembly (4) on both sides are covered with protective shells (6), one of the protective shells (6) is provided with a control panel (7), and the front of the mounting table (1) is provided with a protective baffle (8), which is located between the two protective shells (6).