Double-channel screw extrusion equipment

Abstract

The invention discloses double-channel screw extrusion equipment, and relates to the technical field of screw extrusion equipment. Through a double-channel extrusion technology, a sandwich structure can be formed in food and other composite materials, so that an inner-layer thermosensitive or photosensitive material is better protected, the inner-layer material is protected by an outer-layer coating layer, the influence of environmental factors such as high temperature and illumination is avoided, and the stability and biological activity of the components are improved; therefore, the nutritional value and the medicinal effect of the product are improved; and a rotating disc in the variable die head assembly is driven by a rotating motor, so that the shape and the aperture of an outlet can be adjusted in real time under the condition that the die head is not disassembled, different die head sizes and shapes are switched, and the downtime and the labor cost are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of screw extrusion equipment, in particular to a double-channel screw extrusion equipment. Background Art

[0002] Extrusion processing involves heating the material while the screw conveys it through the extruder. This process combines mixing, heating, cooking, puffing, molding, and sterilization in a single step. Commonly used extruders include single-screw and twin-screw extruders, which are widely used in modern industrial production for fields such as plastics, food, and medicine. With the rapid development of industries such as composite materials, functional foods, and biodegradable materials, the extrusion molding process places higher demands on the equipment's adaptability, precise control capabilities, and diversified product structures. As a key piece of equipment for molding materials, screw extrusion equipment, with its advantages of continuity, high efficiency, and wide applicability, is widely used in the processing and manufacturing of multiphase material blending, functional component compounding, and structural products.

[0003] Existing screw extrusion equipment is mostly based on a single-channel single-layer structure, which can only process one type of material or a single-level structure, and it is difficult to meet the requirements of simultaneous molding of multi-component, double-layer or sandwich-type composite materials. In addition, the die head structure of traditional equipment is fixed, and the outlet shape and aperture need to be achieved by manually replacing the mold. This is not only complicated to operate, but also unable to adapt to changes in complex product shapes or achieve dynamic adjustment, limiting the diversity and personalized production capacity of extruded products. At the same time, the control system integration of most current equipment is low, the sensor configuration is limited, and process parameters such as temperature, pressure, torque, moisture, etc. are mostly dependent on manual experience adjustment. There is a lack of real-time monitoring and intelligent feedback control functions, resulting in poor product consistency and quality stability. Summary of the Invention

[0004] The purpose of the present invention is to provide a double-channel screw extrusion device to solve the above problems.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention provides a double-channel screw extrusion device, comprising a frame and a double-channel barrel fixed on the frame, the double-channel barrel being provided with an outer material channel and an inner material channel, the outer material channel and the inner material channel being internally provided with a screw assembly, one end of the screw assembly being controlled to rotate by a drive assembly installed on the frame, a quantitative control feeder and a material moisture regulator being provided above the outer material channel and the inner material channel, the bottoms of the quantitative control feeder and the material moisture regulator being connected to the outer material channel and the inner material channel, an extrusion die assembly being connected to the end of the double-channel barrel away from the drive assembly, a variable die assembly being provided on the outside of the extrusion die assembly, the variable die assembly comprising a rotating disc, the rotating disc being placed on the outside of the extrusion die assembly, the rotating disc being controlled to rotate by a rotating motor installed on the frame, a plurality of extrusion holes being provided on the rotating disc, and each of the extrusion holes having a different aperture and shape.

[0007] Furthermore, the drive assembly includes a drive motor connected to the frame, the output end of the drive motor is connected to a gear box, and the end of the screw assembly is placed in the gear box and connected to the gear in the gear box.

[0008] Furthermore, a heat insulation plate is provided between the outer material channel and the inner material channel of the dual-channel barrel.

[0009] Furthermore, the two screw assemblies are co-rotating meshing twin screw structures, and the structures of the two are consistent.

[0010] Furthermore, a material quality sensor is provided at the end of the quantitative control feeder. When the monitoring parameters of the material quality sensor and the feeding quality range set by the operation exceed the tolerance, the feeding speed of the quantitative control feeder is automatically adjusted.

[0011] Furthermore, a moisture quality sensor and a humidity sensor are provided at the end of the material moisture regulator. The humidity sensor is placed inside the outer material channel and the inner material channel. When the moisture content of the material monitored by the humidity sensor and the operation setting exceeds the tolerance, the water feeding rate of the material moisture regulator is automatically adjusted until the target moisture content is reached. The humidity sensor is located 20 mm from the material moisture regulator in the direction of material flow.

[0012] Furthermore, a locking assembly is provided on one side of the rotating motor, and the locking assembly includes a hydraulic cylinder and a positioning pin connected to the piston end of the hydraulic cylinder. The hydraulic cylinder is fixed on the frame, and the positioning pin is inserted into the positioning hole opened on the rotating disc. The rotating disc is provided with a number of positioning holes corresponding to the extrusion holes, and the angle between two adjacent positioning holes is 30°.

[0013] Furthermore, temperature control layers in different areas are provided on the outer wall of the dual-channel barrel, and a temperature sensor is provided inside the dual-channel barrel corresponding to each position of the temperature control layer to realize temperature monitoring and adjustment of the temperature control section.

[0014] Furthermore, the extrusion die assembly includes a co-extrusion die connected to the end of the dual-channel barrel, and the co-extrusion die is provided with an outer bending channel and an inner bending channel connected to the outer material channel and the inner material channel, the tail of the inner bending channel is connected to the outer bending channel to form a total discharge channel, and a material guide pipe is connected to the position where the inner bending channel is connected to the outer bending channel, the diameter of the material guide pipe is smaller than the diameter of the total discharge channel, a heating ring is provided on the outer wall of the co-extrusion die, and a flow monitor and a pressure sensor are provided inside the total discharge channel to monitor and feedback the outlet material quality and outlet pressure respectively.

[0015] Furthermore, a controller is connected to the frame, and a control unit component is provided in the controller. The control unit component includes an electrically connected processor, an electronic control module and a feedback control system. The drive motor, quantitative control feeder, material quality sensor, material moisture regulator, moisture quality sensor, humidity sensor, temperature sensor, heating ring, flow monitor and pressure sensor are all electrically connected to the control unit component.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects:

[0017] The present invention uses dual-channel extrusion technology to form a sandwich structure in food and other complex materials, so that the inner layer of heat-sensitive or light-sensitive materials (such as vitamins, probiotics, and active pharmaceutical ingredients) are better protected. Under the protection of the outer coating layer, the inner layer material avoids the influence of environmental factors such as high temperature and light, improves the stability and biological activity of these ingredients, and thus improves the nutritional value and efficacy of the product; and the rotating disc in the variable die assembly is driven by a rotating motor, and can adjust the outlet shape and aperture in real time without disassembling the die, switch between different die sizes and shapes, reduce downtime and labor costs, and also lock the position of the rotating disc through a locking assembly to prevent deviation from affecting the extrusion effect; the data acquisition and control unit dynamically adjusts the screw speed, heating temperature and die structure according to sensor feedback through a preset control strategy, thereby realizing intelligent control of the process and precise adjustment of the product structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1This is a schematic structural diagram of the double-channel screw extrusion equipment of the present invention;

[0020] Figure 2 This is a front view of the dual-channel screw extrusion equipment of the present invention;

[0021] Figure 3 This is a cross-sectional view of the co-extrusion die;

[0022] Figure 4 It is a side view of the co-extrusion die;

[0023] Figure 5 It is the side view of the rotating disk;

[0024] Figure 6 Provide a top view of the locking assembly installation;

[0025] Explanation of the accompanying symbols: 1. Frame; 2. Dual-channel barrel; 3. Quantitative control feeder; 4. Material moisture regulator; 5. Extrusion die assembly; 51. Co-extrusion die; 52. Outer layer bending channel; 53. Inner layer bending channel; 54. Material guide tube; 6. Rotating disc; 7. Rotating motor; 8. Extrusion hole; 9. Driving motor; 10. Gear box; 11. Hydraulic cylinder; 12. Positioning pin; 13. Positioning hole. DETAILED DESCRIPTION

[0026] like Figure 1-6 As shown, a dual-channel screw extrusion device includes a frame 1 and a dual-channel barrel 2 fixed on the frame 1.

[0027] The dual-channel barrel 2 is provided with an outer material channel and an inner material channel, and screw assemblies are provided inside the outer material channel and the inner material channel. The screw assemblies are prior art and are screw assemblies commonly found in screw extruders. The specific structure will not be described in detail here. A heat insulation plate is provided between the outer material channel and the inner material channel of the dual-channel barrel 2. The two screw assemblies are co-directional meshing twin-screw structures, and the structures of the two are consistent.

[0028] One end of the screw assembly is controlled to rotate by a drive assembly installed on the frame 1. The drive assembly includes a drive motor 9 connected to the frame 1. The output end of the drive motor 9 is connected to the gear box 10. The end of the screw assembly is placed in the gear box 10 and connected to the gear in the gear box 10.

[0029] A quantitative control feeder 3 and a material moisture regulator 4 are provided above the outer material channel and the inner material channel, and the bottoms of the quantitative control feeder 3 and the material moisture regulator 4 are connected to the outer material channel and the inner material channel.

[0030] A material quality sensor is provided at the end of the quantitative control feeder 3. When the material quality sensor's monitoring parameters and the set feed quality range exceed the tolerance, the feeder automatically adjusts the feed speed of the quantitative control feeder 3. The quantitative control feeder 3 is conventional and includes a motor-driven screw feeding device. The screw feeder motor speed is controlled by a variable frequency drive. The motor speed can be adjusted in real time by a control unit based on feedback signals from the quality sensor. Other specific structures are not described in detail here.

[0031] A moisture quality sensor and a humidity sensor are provided at the end of the material moisture regulator 4. The humidity sensor is placed inside the outer material channel and the inner material channel. When the moisture content of the material monitored by the humidity sensor and the operation setting exceeds the tolerance, the water feeding rate of the material moisture regulator 4 is automatically adjusted until the target moisture content is reached.

[0032] The humidity sensor is located 20 mm from the material moisture regulator 4 in the material flow direction to monitor the moisture content of the material.

[0033] The material moisture regulator 4 is an existing technology, including an electrically controlled peristaltic pump and a nozzle. The control unit adjusts the flow rate of the pump according to the humidity sensor signal to achieve precise control of the moisture content. Other specific structures are not described in detail here.

[0034] Temperature control layers in different areas are provided on the outer wall of the dual-channel barrel 2, and a temperature sensor is provided inside the dual-channel barrel 2 corresponding to each position of the temperature control layer to realize temperature monitoring and adjustment of the temperature control section.

[0035] An extrusion die assembly 5 is connected to one end of the dual-channel barrel 2 away from the driving assembly, and the extrusion die assembly 5 includes a co-extrusion die 51 connected to the end of the dual-channel barrel 2, and the co-extrusion die 51 is provided with an outer layer bending channel 52 and an inner layer bending channel 53 connected to the outer layer material channel and the inner layer material channel, the tail of the inner layer bending channel 53 is connected to the outer layer bending channel 52 to form a total discharge channel, and a material guide pipe 54 is connected to the position where the inner layer bending channel 53 is connected to the outer layer bending channel 52, and the diameter of the material guide pipe 54 is smaller than the diameter of the total discharge channel, and a heating ring is provided on the outer wall of the co-extrusion die 51, and a flow monitor and a pressure sensor are provided inside the total discharge channel to monitor and feedback the outlet material quality and outlet pressure respectively.

[0036] A variable die assembly is provided on the outside of the extrusion die assembly 5, and the variable die assembly includes a rotating disc 6. The rotating disc 6 is placed on the outside of the extrusion die assembly 5, and the rotating disc 6 is controlled to rotate by a rotating motor 7 installed on the frame 1. A plurality of extrusion holes 8 are opened on the rotating disc 6, and the aperture and shape of each extrusion hole 8 are different. The rotating disc 6 is driven by the rotating motor 7, and can adjust the outlet shape and aperture in real time without disassembling the die, and automatically switch between different die sizes and shapes, thereby reducing downtime and labor costs.

[0037] A locking assembly is provided on one side of the rotating motor 7. The locking assembly includes a hydraulic cylinder 11 and a locating pin 12 connected to the piston end of the hydraulic cylinder 11. The hydraulic cylinder 11 is fixed to the frame 1. The locating pin 12 is inserted into a locating hole 13 provided on the rotating disc 6. The rotating disc 6 has a number of locating holes 13 corresponding to the number of the extrusion holes 8, and the angle between two adjacent locating holes 13 is 30 degrees. After the extrusion hole 8 is selected, the rotating motor 7 drives the rotating disc 6 to rotate into position, and the hydraulic cylinder 11 drives the locating pin 12 to extend, so that the locating pin 12 is inserted into the locating hole 13, locking the position of the rotating disc 6.

[0038] The frame 1 is connected to a controller, which includes a control unit assembly. The control unit assembly includes an electrically connected processor, an electronic control module, and a feedback control system. The drive motor 9, the quantitative control feeder 3, the material quality sensor, the material moisture regulator 4, the moisture quality sensor, the humidity sensor, the temperature sensor, the heating ring, the flow monitor, and the pressure sensor are all electrically connected to the control unit assembly. The control unit is connected to each sensor to obtain real-time parameters such as material flow, pressure, temperature, and load. It automatically adjusts process parameters such as screw speed, heating section temperature, and material feeding rate according to the set process requirements. The control system uses a fuzzy PID control algorithm to automatically optimize the adjustment process based on feedback signals to ensure quality stability during the production process.

[0039] The action process of the present invention is as follows:

[0040] During use, according to the required shape and diameter of the extrudate, the rotating disc 6 is driven to rotate by the rotating motor 7, the appropriate extrusion hole 8 is selected, the outer layer material and the inner layer material are respectively placed in the corresponding quantitative control feeder 3, the equipment is turned on, the quantitative control feeder 3 conveys the material into the dual-channel barrel 2, the material moisture regulator 4 conveys water into the dual-channel barrel 2, the material is melted in the dual-channel barrel 2, the outer layer material enters the total discharge channel through the outer layer bending channel 52, and the inner layer material enters the total discharge channel through the inner layer bending channel 53 and the guide tube 54, so that the outer layer material can wrap the inner layer material and is extruded through the extrusion hole 8 to shape the shape of the total material.

[0041] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A dual-channel screw extrusion device, characterized in that: The invention comprises a frame (1) and a double-channel barrel (2) fixed on the frame (1), wherein the double-channel barrel (2) is provided with an outer material channel and an inner material channel, wherein the outer material channel and the inner material channel are both provided with a screw assembly, wherein one end of the screw assembly is controlled to rotate by a drive assembly installed on the frame (1), and a quantitative control feeder (3) and a material moisture regulator (4) are provided above the outer material channel and the inner material channel, and the bottoms of the quantitative control feeder (3) and the material moisture regulator (4) are both connected to the outer material channel. The dual-channel barrel (2) is connected to the inner material channel, and an extrusion die assembly (5) is connected to one end of the dual-channel barrel (2) away from the driving assembly. A variable die assembly is provided on the outer side of the extrusion die assembly (5). The variable die assembly includes a rotating disc (6). The rotating disc (6) is placed on the outer side of the extrusion die assembly (5). The rotating disc (6) is controlled to rotate by a rotating motor (7) installed on the frame (1). A plurality of extrusion holes (8) are opened on the rotating disc (6), and each of the extrusion holes (8) has a different aperture and shape.

2. The dual-channel screw extruder according to claim 1, characterized in that: The drive assembly comprises a drive motor (9) connected to the frame (1), an output end of the drive motor (9) is connected to a gear box (10), and an end of the screw assembly is placed in the gear box (10) and connected to a gear in the gear box (10).

3. The dual-channel screw extruder according to claim 2, characterized in that: A heat insulation plate is provided between the outer material channel and the inner material channel of the dual-channel barrel (2).

4. The dual-channel screw extruder according to claim 3, characterized in that: The two screw assemblies are co-rotating meshing twin screw structures, and the structures of the two are consistent.

5. The dual-channel screw extruder according to claim 4, characterized in that: A material quality sensor is provided at the end of the quantitative control feeder (3). When the monitoring parameters of the material quality sensor and the feeding quality range set by the operation exceed the tolerance, the feeding speed of the quantitative control feeder (3) is automatically adjusted.

6. The dual-channel screw extruder according to claim 5, characterized in that: A moisture quality sensor and a humidity sensor are provided at the end of the material moisture regulator (4). The humidity sensor is placed inside the outer material channel and the inner material channel. When the moisture content of the material monitored by the humidity sensor and the operation setting exceeds the tolerance, the water feeding rate of the material moisture regulator (4) is automatically adjusted until the target moisture content is reached. The humidity sensor is located at 20 mm from the material moisture regulator (4) in the material flow direction.

7. The dual-channel screw extruder according to claim 6, characterized in that: A locking assembly is provided on one side of the rotating motor (7), the locking assembly comprising a hydraulic cylinder (11) and a positioning pin (12) connected to the piston end of the hydraulic cylinder (11), the hydraulic cylinder (11) being fixed on the frame (1), the positioning pin (12) being inserted into a positioning hole (13) provided on the rotating disc (6), the rotating disc (6) being provided with a number of positioning holes (13) corresponding to the extrusion holes (8), and an angle between two adjacent positioning holes (13) being 30°.

8. The dual-channel screw extruder according to claim 7, characterized in that: Temperature control layers in different areas are provided on the outer wall of the dual-channel barrel (2), and a temperature sensor is provided inside the dual-channel barrel (2) corresponding to each temperature control layer, so as to realize temperature monitoring and adjustment of the temperature control section.

9. The dual-channel screw extruder according to claim 8, characterized in that: The extrusion die assembly (5) includes a co-extrusion die (51) connected to the end of the dual-channel barrel (2), and the co-extrusion die (51) is provided with an outer layer bending channel (52) and an inner layer bending channel (53) connected to the outer layer material channel and the inner layer material channel. The tail of the inner layer bending channel (53) is connected to the outer layer bending channel (52) to form a total discharge channel, and a guide tube (54) is connected to the position where the inner layer bending channel (53) is connected to the outer layer bending channel (52). The diameter of the guide tube (54) is smaller than the diameter of the total discharge channel. A heating ring is provided on the outer wall of the co-extrusion die (51), and a flow monitor and a pressure sensor are provided inside the total discharge channel to monitor and feedback the outlet material quality and outlet pressure respectively.

10. The dual-channel screw extruder according to claim 9, characterized in that: The frame (1) is connected to a controller, and a control unit component is provided in the controller. The control unit component includes an electrically connected processor, an electric control module and a feedback control system. The drive motor (9), the quantitative control feeder (3), the material quality sensor, the material moisture regulator (4), the moisture quality sensor, the humidity sensor, the temperature sensor, the heating ring, the flow monitor and the pressure sensor are all electrically connected to the control unit component.

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