Twin-screw extruder

Abstract

A twin-screw extruder belongs to the technical field of food processing and comprises a rack, a power mechanism and a cylinder, and the power mechanism and the cylinder are sequentially assembled on the top side of the rack. The end, close to the power mechanism, of the machine barrel is a feeding end, a feeding opening is formed in the feeding end of the machine barrel, and a feeding machine is arranged at the feeding opening. The end, away from the power mechanism, of the machine barrel is a discharging end, a rotary cutting unit is arranged at the discharging end of the machine barrel, and the rotary cutting unit is connected with the machine barrel through a supporting piece. Two screws are arranged in the cavity of the machine barrel, the two screws are arranged in parallel and meshed with each other, and the ends, close to the power mechanism, of the two screws are in transmission connection with the power mechanism. A plurality of threaded sections are sequentially arranged on the screw in the material conveying direction, and the thread intervals of the threaded sections are different. The double-screw extruder disclosed by the utility model is reasonable in design, simple in structure, better in material extruding and curing effect and higher in adaptability, and not only can improve the production quality of products, but also can save the use cost.

Description

Technical Field

[0001] The utility model relates to the technical field of food processing, in particular to a twin-screw extruder. Background Art

[0002] A screw extruder is a machine that extrudes materials through a rotating screw. It primarily consists of a main unit, control system, cooling system, and cutting equipment. The main unit includes key components such as the screw, barrel, feed port, discharge port, and reducer. Screw extruders are widely used in food processing, including cereals, snack foods, nutritious rice flour, textured protein, rice reconstitution, starch gelatinization, caramel products, pet food, and aquatic feed. Their operating principle primarily relies on the rotational motion of the screw. Material enters the machine through the feed port and, upon contact with the rotating screw, is squeezed and conveyed. The screw's rotational motion causes the material to be sheared, compressed, and heated within the press chamber, ultimately extruding through the discharge port.

[0003] In the prior art, the Chinese patent number CN202223329027.4 discloses a large-capacity deep-groove three-screw extruder, which includes a frame, and the upper end of the frame is sequentially provided with a conveying motor, a distribution box, and a barrel, and the input end of the distribution box is transmission-connected to the conveying motor. The output end of the distribution box is transmission-connected to three screws, and the three screws are arranged in parallel along a straight line in the barrel. The feed end of the barrel is provided with a feeding port, and a feeder is provided above the feeding port. The discharge end of the barrel is provided with a side-sliding peeling assembly and a mold assembly. The side-sliding peeling assembly is slidably mounted on the barrel in a direction perpendicular to the material conveying direction, and the mold assembly is rotatably mounted on the barrel.

[0004] Although the above-mentioned three-screw extruder can improve material processing capacity and material processing efficiency, it still has the following shortcomings in actual use: due to the structure of the traditional screw, the extrusion and maturation effects of the material are poor, especially when the material processing volume increases, which further reduces the extrusion and maturation effects of the extruder; and one type of screw can only be adapted to one type of material, and the adaptability of the extruder is low. Since different materials have different extrusion and maturation requirements, staff need to replace different types of screws according to the materials, which is time-consuming and labor-intensive, and greatly increases the cost of use. Utility Model Content

[0005] The purpose of the utility model is to overcome the shortcomings of the extruders in the prior art, such as poor material extrusion and maturation effects and low adaptability, and to provide a twin-screw extruder with reasonable design, simple structure, good material extrusion and maturation effects, and high adaptability, which can not only improve the production quality of the product, but also save the use cost.

[0006] The utility model is realized through the following technical scheme: a twin-screw extruder comprises a frame, a power mechanism and a barrel, the power mechanism and the barrel are assembled on the top side of the frame in sequence; the end of the barrel close to the power mechanism is the feed end, the feed end of the barrel is provided with a feeding port, and a feeder is provided at the feeding port; the end of the barrel away from the power mechanism is the discharge end, the discharge end of the barrel is provided with a peeling unit, and the peeling unit is connected to the barrel through a support; two screws are provided inside the chamber of the barrel, the two screws are arranged in parallel and mesh with each other, and the ends of the two screws close to the power mechanism are transmission connected to the power mechanism; a plurality of thread segments are sequentially arranged on the screw along the material conveying direction, the thread pitches of the plurality of thread segments are different, including one thread segment A and multiple thread segments B, and the thread pitch of the thread segment A is greater than that of all the thread segments B; the thread segment A is arranged at the front end of the material conveying direction, and the multiple thread segments B are arranged sequentially along the material conveying direction.

[0007] A further improvement of the present invention is that the threaded section includes a sleeve, the outer surface of the sleeve is provided with a thread; the screw includes a core shaft, the end of the core shaft close to the power mechanism is provided with a gear shaft for transmission connection, and the threaded section is sleeved on the core shaft.

[0008] A further improvement of the present invention is that the threaded section is keyed to the core shaft, a limit platform for resisting the threaded section is provided on the core shaft near the gear shaft, and a locking bolt for fixing the position of the threaded section is screwed to the end of the core shaft away from the power mechanism.

[0009] A further improvement of the present invention is that the barrel comprises a plurality of barrel units, and the plurality of barrel units are detachably connected in sequence via fasteners.

[0010] A further improvement of the present invention is that a cooling water channel is provided on the barrel unit and is located outside its inner cavity, and the cooling water channels of all barrel units are interconnected in a circular manner, thereby forming a complete circulating water channel, which is connected to the cooling system, and the cooling system is arranged inside the frame.

[0011] A further improvement of the present invention is that a heating ring is provided on the outer side of the barrel unit, and the heating ring is connected to a mold temperature controller through a pipeline.

[0012] A further improvement of the present invention is that the frame is provided with a control device through a support member, and the control device is electrically connected to the power mechanism, the feeder, the peeling unit, the cooling system and the mold temperature controller.

[0013] A further improvement of the present invention is that protective covers are provided on the outer sides of the power mechanism and the barrel.

[0014] The above technical solution demonstrates the beneficial effects of this utility model: the screw of this extruder utilizes a multi-segment structure. Segment A, with a large pitch, is primarily used for conveying materials, ensuring smooth material transport. Segment B, with a small pitch, extrudes and matures the material during conveying, enhancing the extrusion and maturation effects. Furthermore, a detachable connection between the screw's core shaft and the segments significantly enhances the screw's flexibility. Workers no longer need to replace the entire screw; simply replacing segments of different sizes allows for adjustment of the screw's extrusion and maturation levels to accommodate different materials, saving time and effort while offering high adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a structural diagram of a specific embodiment of the utility model;

[0017] Figure 2 yes Figure 1 longitudinal section of

[0018] Figure 3 This is a schematic diagram of the connection structure between the peeling unit, the barrel and the power mechanism of a specific embodiment of the utility model;

[0019] Figure 4 This is a structural diagram of a barrel unit of a specific embodiment of the present invention;

[0020] Figure 5 It is a structural schematic diagram of a screw rod in a specific embodiment of the utility model;

[0021] Figure 6 It is a structural schematic diagram of the threaded section of a specific embodiment of the utility model.

[0022] 1. Frame; 2. Power mechanism; 201. Main motor; 202. Reducer; 3. Barrel; 301. Barrel unit; 302. Cooling water channel; 4. Screw; 401. Gear shaft; 402. Limit table; 403. Locking bolt; 5. Threaded section; 501. Sleeve; 502. Thread; 6. Feeder; 7. Peeling unit; 701. Cutting assembly; 702. Discharging assembly; 8. Heating coil; 9. Cooling system; 10. Control device; 11. Protective cover. DETAILED DESCRIPTION

[0023] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the specific embodiments. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this patent.

[0024] Please refer to the attached Figure 1-6 , combined with a specific embodiment, it is explained as follows: The twin-screw extruder described in the present invention includes a frame 1, a power mechanism 2 and a barrel 3, and the power mechanism 2 and the barrel 3 are assembled on the top side of the frame 1 in sequence. The end of the barrel 3 close to the power mechanism 2 is the feed end, and the feed end of the barrel 3 is provided with a feeding port, and a feeder 6 is provided at the feeding port. The end of the barrel 3 away from the power mechanism 2 is the discharge end, and the discharge end of the barrel 3 is provided with a peeling unit 7, and the peeling unit 7 is connected to the barrel 3 through a support. Combined with the extruder in the prior art, the power mechanism 2 includes a main motor 201 and a reducer 202, and the peeling unit 7 includes a cutting assembly 701 and a discharge assembly 702. The detailed structure between the above-mentioned frame 1, power mechanism 2, barrel 3, feeder 6 and peeling unit 7 will not be described in detail in this specification.

[0025] Two screws 4 are installed within the barrel 3. These screws 4 are arranged parallel to each other and mesh with each other. The ends of the screws 4 closest to the power mechanism 2 are connected to the power mechanism 2. Several thread segments 5 are arranged in sequence along the material conveying direction. These thread segments 5 have varying pitches, including one thread segment A and multiple thread segments B. The thread pitch of thread segment A is greater than that of all thread segments B. Thread segment A is positioned at the front end of the material conveying direction, while the multiple thread segments B are arranged in sequence along the material conveying direction. The screw 4 employs a structure with multiple thread segments 5. Segment A, with its larger pitch, is primarily used for conveying materials, ensuring smooth material transport. Segments B, with their smaller pitch, compress and mature the material during conveying, enhancing the material's extrusion and maturation performance. It should be noted that the actual pitch of thread segments A and B can be pre-set based on the material being conveyed. A larger pitch in segment A increases its material conveying capacity, while a smaller pitch in segment B improves its material extrusion and maturation performance.

[0026] Specifically, the threaded segment 5 includes a sleeve 501, and the outer surface of the sleeve 501 is provided with a thread 502; the screw 4 includes a core shaft, and the end of the core shaft close to the power mechanism 2 is provided with a gear shaft 401 for transmission connection, and the threaded segment 5 is sleeved on the core shaft. The threaded segment 5 is key-connected to the core shaft, and a limit platform 402 for resisting the threaded segment 5 is provided on the core shaft near the gear shaft 401. The end of the core shaft away from the power mechanism 2 is screwed with a locking bolt 403 for fixing the position of the threaded segment 5. Through the above design, a detachable connection structure is formed between the core shaft and the threaded segment 5, which greatly improves the flexibility of the screw 4. The staff no longer need to replace the entire screw 4. They only need to replace different types of threaded segments 5 to adjust the extrusion and ripening degree of the screw 4, thereby adapting to different materials. This saves time and effort and has high adaptability.

[0027] Specifically, the barrel 3 includes seven barrel units 301, which are detachably connected in sequence via fasteners. The barrel 3 adopts a segmented structure, allowing its total length to be flexibly adjusted according to the production requirements of the processed material, thereby enabling the barrel 3 to meet the production requirements of different materials.

[0028] Specifically, the barrel unit 301 is provided with a cooling water channel 302 located outside its inner cavity. The cooling water channels 302 of all barrel units 301 are interconnected, forming a complete circulating water channel. This circulating water channel is connected to a cooling system 9 located within the frame 1. This cooling system 9 cools the barrel 3, thereby ensuring stable operation of the extruder. In conjunction with prior art extruders, the detailed structure of the cooling system 9 and the circulating water channel will not be further elaborated in this specification.

[0029] Specifically, a heating coil 8 is installed on the outside of the barrel unit 301, which is connected to a mold temperature controller via a pipeline. This design allows for independent temperature control of the barrel unit 301, specifically, the mold temperature controller and valves installed on the pipeline control the temperature of the corresponding heating coil 8. In conjunction with existing extruders, the detailed connection structure between the mold temperature controller and the heating coil 8 is not detailed in this specification.

[0030] The working principle of the present utility model is as follows: the power mechanism 2 provides power to drive the screw 4 to rotate. The material is conveyed into the inner cavity of the barrel 3 through the feeder 6 and is conveyed by the screw 4. During the conveying process, the material is extruded and matured by the screw 4 and finally processed by the rotary cutting unit 7 and output. The screw 4 of this extruder adopts a structure of multiple thread segments 5, among which the thread segment A with a large thread pitch is mainly used to convey the material to ensure smooth material conveying; the thread segment B with a small thread pitch can extrude and mature the material during the conveying process, which can improve the extrusion and maturation effect of the material. At the same time, a detachable connection structure is formed between the core shaft of the screw 4 and the thread segment 5, which greatly improves the flexibility of the screw 4. The staff no longer need to replace the entire screw 4. They only need to replace the thread segments 5 of different models to adjust the extrusion and maturation degree of the screw 4, so as to adapt to different materials, saving time and effort and having high adaptability.

[0031] In one embodiment, the frame 1 is provided with a control device 10 via a support member. The control device 10 is electrically connected to the power mechanism 2, the feeder 6, the peeling unit 7, the cooling system 9, and the mold temperature controller. Through the above design, a worker can use the control device 10 to control the operation of the power mechanism 2, the feeder 6, the peeling unit 7, the cooling system 9, and the mold temperature controller, that is, to control the press. In combination with mechanical control technology in the prior art, the control device 10 includes a touch screen. The detailed structure of the control device 10 and the relationship between the control device 10 and the power mechanism 2, the feeder 6, the peeling unit 7, the cooling system 9, and the mold temperature controller will not be described in detail in this specification.

[0032] In one embodiment, a protective cover 11 is provided outside the power mechanism 2 and the barrel 3. The design of the protective cover 11 can improve the safety of the extruder.

[0033] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0034] The terms "upper," "lower," "outer," "inner," and the like, if used in the specification and claims of the present invention and the accompanying drawings, are used to distinguish relative positions and do not necessarily define them. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in sequences other than those illustrated or described herein. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0035] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A twin-screw extruder, comprising a frame (1), a power mechanism (2) and a barrel (3), wherein the power mechanism (2) and the barrel (3) are sequentially assembled on the top side of the frame (1), characterized in that: The end of the barrel (3) close to the power mechanism (2) is the feeding end, and the feeding end of the barrel (3) is provided with a feeding port, and a feeder (6) is provided at the feeding port; the end of the barrel (3) away from the power mechanism (2) is the discharging end, and the discharging end of the barrel (3) is provided with a rotary cutting unit (7), and the rotary cutting unit (7) is connected to the barrel (3) through a support member; two screws (4) are provided inside the chamber of the barrel (3), the two screws (4) are arranged in parallel and meshed with each other, and the ends of the two screws (4) close to the power mechanism (2) are transmission-connected to the power mechanism (2); a plurality of thread segments (5) are sequentially provided on the screw (4) along the material conveying direction, and the thread pitches of the plurality of thread segments (5) are different, including one thread segment A and a plurality of thread segments B, and the thread pitch of the thread segment A is greater than that of all the thread segments B; the thread segment A is arranged at the front end in the material conveying direction, and the plurality of thread segments B are sequentially arranged along the material conveying direction.

2. A twin-screw extruder according to claim 1, characterized in that, The threaded section (5) includes a sleeve (501), and the outer surface of the sleeve (501) is provided with a thread (502); the screw (4) includes a core shaft, and the end of the core shaft close to the power mechanism (2) is provided with a gear shaft (401) for transmission connection, and the threaded section (5) is sleeved on the core shaft.

3. A twin-screw extruder according to claim 2, characterized in that, The threaded section (5) is key-connected to the core shaft. A position of the core shaft near the gear shaft (401) is provided with a limit platform (402) for resisting the threaded section (5). An end of the core shaft away from the power mechanism (2) is screwed with a locking bolt (403) for fixing the position of the threaded section (5).

4. A twin-screw extruder according to claim 1 or 3, characterized in that, The barrel (3) comprises a plurality of barrel monomers (301), and the plurality of barrel monomers (301) are detachably connected in sequence via fasteners.

5. A twin-screw extruder according to claim 4, characterized in that, The barrel monomer (301) is provided with a cooling water channel (302) located outside its inner cavity, and the cooling water channels (302) of all barrel monomers (301) are circulated and connected to each other, thereby forming a complete circulating water channel. The circulating water channel is connected to the cooling system (9), and the cooling system (9) is arranged inside the frame (1).

6. A twin-screw extruder according to claim 5, characterized in that: A heating ring (8) is provided on the outside of the barrel unit (301), and the heating ring (8) is connected to a mold temperature controller via a pipeline.

7. A twin-screw extruder according to claim 6, characterized in that: The frame (1) is provided with a control device (10) via a support member, and the control device (10) is electrically connected to the power mechanism (2), the feeder (6), the rotary cutting unit (7), the cooling system (9), and the mold temperature controller.

8. A twin-screw extruder according to claim 7, characterized in that: A protective cover (11) is provided on the outside of the power mechanism (2) and the barrel (3).

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