A twin-screw extrusion granulator

Abstract

This utility model relates to a double-screw extrusion granulator, including a housing, a rotating shaft, a drive assembly, and an extrusion mechanism. The rotating shaft is rotatably and horizontally disposed within the housing, with one end extending out and connected to the drive assembly. The extrusion mechanism includes an inner liner frame and a screen cylinder. The inner liner frame is mounted on the rotating shaft, and inner spiral blades are disposed on the outer side of the inner liner frame. The screen cylinder is fitted onto the outer side of the inner liner frame and connected to the inner wall of the housing. Outer spiral blades matching the inner spiral blades are disposed on the inner side of the screen cylinder. The extrusion mechanism divides the interior of the housing into a feeding chamber and a discharging chamber. A feeding port is disposed at the top of the feeding chamber, and a discharging port is disposed at the bottom of the discharging chamber. This utility model extrudes plastic granules through the cooperation of the inner and outer spiral blades. After entering the extrusion channel, the plastic granules are subjected to strong shearing and compression by the two screws, thereby improving the extrusion and dehydration effect of the plastic granules.

Description

Technical Field

[0001] This utility model relates to the technical field of plastic granule production, specifically to a twin-screw extrusion granulator. Background Technology

[0002] With economic development, people's living standards are gradually improving, and plastic products are emerging in an endless stream and are widely popular. With the increase in plastic products, plastic pelletizers are also widely used. Plastic is a high molecular compound made by polymerizing monomers through addition or condensation reactions. Its resistance to deformation is moderate, between that of fiber and rubber. It is composed of synthetic resins and additives such as fillers, plasticizers, stabilizers, lubricants, and colorants. Plastic pellets are a raw material frequently used in the production of plastic products.

[0003] Plastic granulators are mechanical devices used for manufacturing plastic pellets, primarily applied in plastic modification (reinforcement / filling / blending), recycling granulation, and engineering plastics processing. Existing plastic granulators typically employ single-screw extrusion, which results in insufficient dehydration. Alternatively, twin-screw extrusion granulators exist, utilizing the strong shearing, extruding, and frictional forces generated by the two screws to enhance dehydration. However, the two screws increase the granulator's size, requiring more space. Utility Model Content

[0004] Based on the above description, this utility model provides a twin-screw extrusion granulator, which extrudes plastic granules through the cooperation of inner and outer spiral blades. After entering the extrusion channel, the plastic granules are subjected to strong shearing and compression by the two screws, thereby improving the extrusion and dehydration effect of the plastic granules.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A twin-screw extrusion granulator includes a housing, a rotating shaft, a drive assembly, and an extrusion mechanism; the rotating shaft is rotatably and horizontally arranged in the housing, and one end of the rotating shaft extends out of the housing and is connected to the drive assembly; The extrusion mechanism includes an inner liner frame and a screen cylinder. The inner liner frame is mounted on the rotating shaft, and an inner spiral blade is provided on the outer side of the inner liner frame. The screen cylinder is sleeved on the outer side of the inner liner frame and is connected to the inner wall of the box. An outer spiral blade that matches the inner spiral blade is provided on the inner side of the screen cylinder. The extrusion mechanism divides the interior of the housing into a feeding chamber and a discharging chamber, and an extrusion channel is formed between the inner spiral blade and the outer spiral blade; the top of the feeding chamber is provided with a feeding port, and the bottom of the discharging chamber is provided with a discharging port.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, a first fan is provided inside the feeding chamber and is mounted on the rotating shaft; the feeding port is located between the first fan and the extrusion mechanism, and the airflow direction of the first fan when it rotates is towards the extrusion mechanism.

[0008] Furthermore, the first fan includes a first fixed ring, a first outer ring, and a plurality of first fan blades; the first fixed ring is sleeved on the rotating shaft, and the first outer ring is concentrically arranged with the first fixed ring; the first fan blades are all evenly arranged around the circumference of the first fixed ring, the inner end of each of the first fan blades is connected to the first fixed ring, and the outer end of each of the first fan blades is connected to the first outer ring. The housing is provided with a first wind deflector, and the wind deflector is provided with a first ventilation opening. The wind deflector is folded around the edge of the first ventilation opening toward the side closer to the first fan to form a first wind deflector wing. The first wind deflector wing and the inner side wall of the first outer ring are fitted with a clearance.

[0009] Furthermore, a second fan is provided inside the discharge chamber and is mounted on the rotating shaft; the discharge port is located between the second fan and the extrusion mechanism, and the airflow direction of the second fan when it rotates is towards the extrusion mechanism.

[0010] Furthermore, the second fan includes a second fixed ring, a second outer ring, and a plurality of second fan blades; the second fixed ring is sleeved on the rotating shaft, and the second outer ring is concentrically arranged with the second fixed ring; the second fan blades are all evenly arranged around the circumference of the second fixed ring, the inner end of each of the second fan blades is connected to the second fixed ring, and the outer end of each of the second fan blades is connected to the second outer ring; The housing is equipped with a second wind deflector, which has a second ventilation opening. The wind deflector is folded around the edge of the second ventilation opening toward the two sides near the second fan to form a second wind deflector wing. The second wind deflector wing and the inner wall of the second outer ring are fitted with a clearance.

[0011] Furthermore, the inner wall of the box is provided with an outer lining skeleton surrounding the screen cylinder, and the screen cylinder is rotatably mounted on the outer lining skeleton; an isolation cavity is provided between the outer lining skeleton and the inner wall of the box, and the isolation cavity is isolated from the feed cavity and the discharge cavity through the outer lining skeleton.

[0012] Furthermore, a drain outlet is provided at the bottom of the housing, and the drain outlet is connected to the isolation chamber.

[0013] Furthermore, the extrusion granulator also includes a drive shaft, which is arranged parallel to the rotating shaft and is rotatably mounted on the outer wall of the housing; one end of the drive shaft is connected to the rotating shaft via a belt, and a plurality of drive gears are provided on the drive shaft; The screen cylinder and the outer liner frame are rotatably connected, and a driven gear is provided on the outer wall of the screen cylinder; a communication port is provided on the side of the isolation cavity near the drive shaft, and the driven gear meshes with the driving gear through the communication port.

[0014] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: 1. This utility model uses inner and outer spiral blades that cooperate with each other to squeeze plastic granules. After the plastic granules enter the extrusion channel, they are subjected to strong shearing and compression by the two spiral blades, thereby improving the extrusion and dehydration effect of the plastic granules. 2. Compared with the traditional twin-screw granulator, this utility model adopts an outer spiral blade sleeved on the outside of the inner spiral blade to form an annular extrusion channel, which can reduce the space occupied by the equipment and ensure that all parts of the extrusion channel are subjected to strong shearing and compression by the two spiral blades, thereby improving the extrusion and dewatering effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a twin-screw extrusion granulator provided in Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the structure of a twin-screw extrusion granulator provided in Embodiment 2 of this utility model; The attached diagram lists the components represented by each number as follows: 1. Housing; 11. Feed chamber; 12. Feed inlet; 13. Discharge chamber; 14. Discharge outlet; 15. Isolation chamber; 16. Connecting port; 2. Rotating shaft; 3. Drive assembly; 4. Extrusion mechanism; 41. Inner liner frame; 42. Inner spiral blade; 43. Screen cylinder; 44. Outer spiral blade; 45. Extrusion channel; 46. Outer liner frame; 47. Driven gear; 5. First fan; 51. First fixed ring; 52. First outer ring; 53. First fan blade; 54. First baffle plate; 55. First vent; 56. First baffle wing plate; 6. Second fan; 61. Second fixed ring; 62. Second outer ring; 63. Second fan blade; 64. Second baffle plate; 65. Second vent; 66. Second baffle wing plate; 7. Drain outlet; 8. Drive shaft; 81. Drive gear; 9. Belt. Detailed Implementation

[0016] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0018] It is understood that spatial relation terms such as “below,” “under,” “below,” “below,” “above,” “above,” etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “below,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0019] Example 1 A twin-screw extrusion granulator includes a housing 1, a rotating shaft 2, a drive assembly 3, and an extrusion mechanism 4. The rotating shaft 2 is rotatably and horizontally disposed inside the housing 1, with one end of the rotating shaft 2 extending out and connected to the drive assembly 3.

[0020] The extrusion mechanism 4 includes an inner liner frame 41 and a screen cylinder 43. The inner liner frame 41 is mounted on the rotating shaft 2, and an inner spiral blade 42 is provided on the outer side of the inner liner frame 41. The screen cylinder 43 is fitted onto the outer side of the inner liner frame 41 and is connected to the inner wall of the housing 1. An outer spiral blade 44 that matches the inner spiral blade 42 is provided on the inner side of the screen cylinder 43.

[0021] The extrusion mechanism 4 divides the interior of the housing 1 into a feeding chamber 11 and a discharging chamber 13, and an extrusion channel 45 is formed between the inner spiral blade 42 and the outer spiral blade 44. The top of the feeding chamber 11 is provided with a feeding port 12, and the bottom of the discharging chamber 13 is provided with a discharging port 14.

[0022] The inner wall of the housing 1 is provided with an outer lining frame 46 surrounding the screen cylinder 43, and the screen cylinder 43 is rotatably mounted on the outer lining frame 46. An isolation cavity 15 is provided between the outer lining frame 46 and the inner wall of the housing 1. The isolation cavity 15 is isolated from the feed cavity 11 and the discharge cavity 13 by the outer lining frame 46. A drain outlet 7 is provided at the bottom of the housing 1, and the drain outlet 7 is connected to the isolation cavity 15.

[0023] In addition, a first fan 5 is provided inside the feed chamber 11, and the first fan 5 is mounted on the rotating shaft 2. The feed port 12 is located between the first fan 5 and the extrusion mechanism 4, and the airflow direction of the first fan 5 when it rotates is towards the extrusion mechanism 4.

[0024] Specifically, the first fan 5 includes a first fixing ring 51, a first outer ring 52, and a plurality of first fan blades 53. The first fixing ring 51 is sleeved on the rotating shaft 2, and the first outer ring 52 is concentrically arranged with the first fixing ring 51. The first fan blades 53 are all evenly arranged around the circumference of the first fixing ring 51, and the inner ends of the first fan blades 53 are all connected to the first fixing ring 51, while the outer ends of the first fan blades 53 are all connected to the first outer ring 52.

[0025] The housing 1 is provided with a first wind deflector 54, and a first ventilation opening 55 is provided on the wind deflector. The wind deflector is folded around the edge of the first ventilation opening 55 toward the side closer to the first fan 5 to form a first wind deflector wing 56. The first wind deflector wing 56 and the inner side wall of the first outer ring 52 are fitted with a clearance.

[0026] In this embodiment, by setting a first fan 5 in the feeding chamber 11, the plastic particles entering the box 1 can be blown apart and the plastic particles can be sent into the extrusion channel 45.

[0027] A second fan 6 is installed inside the discharge chamber 13 and is mounted on the rotating shaft 2. The discharge port 14 is located between the second fan 6 and the extrusion mechanism 4, and the airflow direction of the second fan 6 when it rotates is towards the extrusion mechanism 4.

[0028] Specifically, the second fan 6 includes a second fixing ring 61, a second outer ring 62, and a plurality of second fan blades 63. The second fixing ring 61 is sleeved on the rotating shaft 2, and the second outer ring 62 is concentrically arranged with the second fixing ring 61. The second fan blades 63 are all evenly arranged around the circumference of the second fixing ring 61, and the inner ends of the second fan blades 63 are all connected to the second fixing ring 61, while the outer ends of the second fan blades 63 are all connected to the second outer ring 62.

[0029] The housing 1 is equipped with a second wind deflector 64, and a second ventilation opening 65 is provided on the wind deflector. The wind deflector is folded around the edge of the second ventilation opening 65 towards the two sides near the second fan 6 to form a second wind deflector wing 66. The second wind deflector wing 66 and the inner side wall of the second outer ring 62 are fitted with a clearance.

[0030] The second fan 6 provides horizontal resistance to the plastic particles that have completed dehydration and left the extrusion mechanism 4, accelerating the plastic particles from falling out of the discharge port 14 and preventing the plastic particles from sticking to the inside of the box 1.

[0031] In this embodiment, the plastic granules are squeezed by the inner spiral blade 42 and the outer spiral blade 44 that cooperate with each other. After the plastic granules enter the extrusion channel 45, they are subjected to strong shearing and compression by the two spiral blades, thereby improving the extrusion and dehydration effect of the plastic granules.

[0032] In addition, compared with the traditional twin-screw granulator, this utility model adopts an outer spiral blade 44 set on the outside of the inner spiral blade 42 to form an annular extrusion channel 45, which can reduce the space occupied by the equipment and make all parts of the extrusion channel 45 subject to strong shearing and compression action of the two spiral blades, thereby improving the extrusion and dewatering effect.

[0033] Example 2 The difference between this embodiment and Embodiment 1 is that the twin-screw extrusion granulator in this embodiment further includes a drive shaft 8, which is arranged parallel to the rotating shaft 2 and is rotatably mounted on the outer wall of the housing 1. One end of the drive shaft 8 is connected to the rotating shaft 2 via a belt 9, and several drive gears 81 are provided on the drive shaft 8.

[0034] The screen cylinder 43 and the outer liner frame 46 are rotatably connected, and a driven gear 47 is provided on the outer wall of the screen cylinder 43. A communication port 16 is provided on the side of the isolation chamber 15 near the drive shaft 8, and the driven gear 47 meshes with the driving gear 81 through the communication port 16.

[0035] In this embodiment, when the granulator is working, the inner spiral blade 42 and the outer spiral blade 44 are driven to rotate in opposite directions simultaneously by a drive component 3, which increases the relative rotation speed of the spiral blade and the outer spiral blade 44 and further improves the extrusion and dewatering effect.

[0036] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A twin-screw extrusion granulator characterized by comprising: It includes a housing, a rotating shaft, a drive assembly, and a pressing mechanism; the rotating shaft is rotatably and horizontally disposed within the housing, and one end of the rotating shaft extends out and is connected to the drive assembly; The extrusion mechanism includes an inner liner frame and a screen cylinder. The inner liner frame is mounted on the rotating shaft, and an inner spiral blade is provided on the outer side of the inner liner frame. The screen cylinder is sleeved on the outer side of the inner liner frame and is connected to the inner wall of the box. An outer spiral blade that matches the inner spiral blade is provided on the inner side of the screen cylinder. The extrusion mechanism divides the interior of the housing into a feeding chamber and a discharging chamber, and an extrusion channel is formed between the inner spiral blade and the outer spiral blade; the top of the feeding chamber is provided with a feeding port, and the bottom of the discharging chamber is provided with a discharging port.

2. A twin-screw extrusion granulator according to claim 1, characterized in that A first fan is provided inside the feeding chamber and is mounted on the rotating shaft; the feeding port is located between the first fan and the extrusion mechanism, and the airflow direction of the first fan when it rotates is towards the extrusion mechanism.

3. A twin-screw extrusion granulator according to claim 2, characterized in that, The first fan includes a first fixed ring, a first outer ring, and a plurality of first fan blades; the first fixed ring is sleeved on the rotating shaft, and the first outer ring is concentrically arranged with the first fixed ring; the first fan blades are evenly arranged around the circumference of the first fixed ring, the inner end of each of the first fan blades is connected to the first fixed ring, and the outer end of each of the first fan blades is connected to the first outer ring. The housing is provided with a first wind deflector, and the wind deflector is provided with a first ventilation opening. The wind deflector is folded around the edge of the first ventilation opening toward the side closer to the first fan to form a first wind deflector wing. The first wind deflector wing and the inner side wall of the first outer ring are fitted with a clearance.

4. A twin-screw extrusion granulator according to claim 1, wherein A second fan is provided inside the discharge chamber and is mounted on the rotating shaft; the discharge port is located between the second fan and the extrusion mechanism, and the airflow direction of the second fan when it rotates is towards the extrusion mechanism.

5. A twin-screw extrusion granulator according to claim 4, characterized in that, The second fan includes a second fixed ring, a second outer ring, and a plurality of second fan blades; the second fixed ring is sleeved on the rotating shaft, and the second outer ring is concentrically arranged with the second fixed ring; the second fan blades are evenly arranged around the circumference of the second fixed ring, the inner end of each of the second fan blades is connected to the second fixed ring, and the outer end of each of the second fan blades is connected to the second outer ring; The housing is equipped with a second wind deflector, which has a second ventilation opening. The wind deflector is folded around the edge of the second ventilation opening toward the two sides near the second fan to form a second wind deflector wing. The second wind deflector wing and the inner wall of the second outer ring are fitted with a clearance.

6. A twin-screw extrusion granulator according to claim 1, characterized in that, The inner wall of the box is provided with an outer lining frame surrounding the screen cylinder, and the screen cylinder is rotatably mounted on the outer lining frame; an isolation cavity is provided between the outer lining frame and the inner wall of the box, and the isolation cavity is isolated from the feed cavity and the discharge cavity through the outer lining frame.

7. A twin-screw extrusion granulator according to claim 6, characterized in that, The bottom of the box is provided with a drain outlet, which is connected to the isolation chamber.

8. A twin-screw extrusion granulator according to claim 6, characterized in that, It also includes a drive shaft, which is arranged parallel to the rotating shaft and is rotatably mounted on the outer wall of the housing; one end of the drive shaft is connected to the rotating shaft via a belt, and several drive gears are provided on the drive shaft; The screen cylinder and the outer liner frame are rotatably connected, and a driven gear is provided on the outer wall of the screen cylinder; a communication port is provided on the side of the isolation cavity near the drive shaft, and the driven gear meshes with the driving gear through the communication port.

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