A twin-screw granulator for producing nylon 66 and a method thereof

Abstract

The application discloses a double-screw granulator for nylon 66 production and a method, which comprises a rack, wherein the rack is provided with a roller rotating in a circumferential direction through a slide assembly, the roller is provided with a driving screw and a driven screw rotatingly installed in the roller, the driving screw drives the driven screw through a transmission mechanism outside the roller, a plurality of scrapers for assisting in cleaning the screw are arranged on the inner wall of the roller, the scrapers are arranged in a group in a circumferential annular array on the inner wall of the roller, and a plurality of groups of the scrapers are arranged axially along the inner wall of the roller; a ring gear is arranged on the outer wall of the roller in a circumferential direction, and the ring gear is in meshing engagement with a driving assembly to drive the roller to rotate. The method comprises a cleaning method and a working method, the application has the advantages of good cleaning effect, high product quality, reduced energy consumption, convenience in maintenance and repair, no need to disassemble a plurality of components during cleaning, and consideration of production and cleaning efficiency.

Description

Technical Field

[0001] This invention relates to a twin-screw granulator and method, and more particularly to a twin-screw granulator and method for producing nylon 66. Background Technology

[0002] A twin-screw granulator is a mechanical device used for granulation and pelletizing. Its working principle mainly includes the following steps: Raw material conveying: The raw material to be processed is conveyed to the feed inlet of the twin screw through a feeder or other conveying device. Crushing and compression: Inside the twin screw at the feed inlet, the two screws rotating in the same direction crush and compress the raw material into granular materials of a specified size. Cooling and unloading: After the material is pressed and squeezed by the twin screw and the die, it will reach a certain degree of adhesion and hardness. At this time, the material needs to be cooled by a cooler. Under the premise of ensuring that shrinkage and deformation do not occur, the granules harden and become solid, and then are discharged through the discharge port.

[0003] Twin-screw granulators produce good granulation results, produce uniform particles, and are easy to operate. However, they also have the problem of being difficult to clean. The internal structure of twin-screw granulators is complex, and cleaning requires disassembling multiple components, which is time-consuming, labor-intensive, and not conducive to maintenance. Summary of the Invention

[0004] To address the shortcomings of the aforementioned technologies, this invention provides a twin-screw granulator and method for producing nylon 66.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: a twin-screw granulator for the production of nylon 66, including a frame, with a drum that rotates circumferentially through a slide assembly sandwiched between the frames, a driving screw and a driven screw rotatably installed inside the drum, the driving screw driving the driven screw outside the drum through a transmission mechanism, and several claws on the inner wall of the drum for assisting in cleaning the screw, the claws being arranged in a circumferential ring array as one group on the inner wall of the drum, and several groups arranged axially along the inner wall of the drum;

[0006] A ring gear is arranged around the outer wall of the drum, and the ring gear meshes with the drive assembly to drive the drum to rotate.

[0007] Furthermore, the frame has a left support end plate and a right support end plate, and the slide assembly includes annular flanges located at the edges of the left and right support end plates, and slide grooves at the roller side end that match the annular flanges at the edges of the left and right support end plates, respectively.

[0008] Furthermore, the claws are elastic, with the claw bodies all facing the central axis of the roller, the heads of the claws bent, and all claws bent either clockwise or counterclockwise in the circular array.

[0009] Furthermore, the transmission mechanism includes a first motor mounted on the frame, the main shaft of the first motor being connected to the shaft end of the driving screw, and pulleys being provided on both the driving screw and the driven screw, with a belt being mounted on both pulleys.

[0010] Furthermore, the driving screw and the driven screw are arranged in parallel to each other, and the driving screw and the driven screw are respectively rotatably mounted between the left support end plate and the right support end plate of the frame through bearings.

[0011] Furthermore, the drive assembly includes a second motor, a reducer connected to the main shaft of the second motor, and a drive gear meshing with a ring gear mounted on the output shaft of the reducer.

[0012] Furthermore, a feed inlet is provided at the upper part of the right support end plate, and a discharge outlet is provided at the center of the left support end plate.

[0013] Furthermore, the discharge port is inclined downwards, and a cutter is provided at the outlet of the discharge port.

[0014] A working method for a twin-screw granulator used in the production of nylon 66 is described. The working method involves using the rotating drive screw and driven screw in the drum to propel molten raw material. The rotating drum melts the raw material, which is then pressed against the back of the claws and adhered to the inner wall of the drum. The claws adhering to the inner wall of the drum, together with the drive screw and driven screw, create internal and external rotating mixing and molding conditions, gradually extruding the material to the discharge port. The material is then cooled and shaped through the discharge port and cut into the required granular form using a cutter.

[0015] A cleaning method for a twin-screw granulator used in the production of nylon 66 is characterized in that: the cleaning method involves using the rotating drive screw and driven screw in the drum to push out molten raw material, and using the rotating claws in the drum to scrape the molten raw material adhering to the drive screw and driven screw, so that the molten raw material is pushed towards the discharge port along the spiral blades on the drive screw and driven screw under the scraping action.

[0016] This invention discloses a twin-screw granulator and method for producing nylon 66. It has good cleaning effect, produces high-quality products, reduces energy consumption, and is easy to maintain and repair. It does not require disassembling multiple components during cleaning, thus achieving a balance between high efficiency in production and cleaning. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] Figure 2 This is a perspective view of the roller and its interior of the present invention.

[0019] Figure 3 This is a side view of the drum.

[0020] In the diagram: 1. Frame; 2. Roller; 3. Driven screw; 4. Driven screw; 5. Claw; 6. Ring gear; 7. Left support end plate; 8. Right support end plate; 9. Annular flange; 10. Slide groove; 11. First motor; 12. Pulley; 13. Belt; 14. Bearing; 15. Second motor; 16. Reducer; 17. Drive gear; 18. Feed inlet; 19. Discharge outlet; 20. Cutter. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1-3 The twin-screw granulator for producing nylon 66 shown includes a frame 1 with a left support end plate 7 and a right support end plate 8. The slide assembly includes annular flanges 9 located along the edges of the left and right support end plates 7 and 8, and grooves 10 on the sides of the roller 2 that match the annular flanges 9 along the edges of the left and right support end plates 7 and 8, respectively. The annular flanges 9 and the matching grooves 10 serve to fix the roller 2, installing it between the left and right support end plates 7 and 8 of the frame 1, allowing the two ends of the roller to... The corresponding annular flange 9 is matched and located within the slide groove 10. When the roller 2 starts to rotate, it continuously slides back and forth between the annular flange 9 and the slide groove 10. This sliding process helps reduce friction, allowing the roller 2 to operate more smoothly and forming a relative dynamic seal. During operation, one side of the roller 2 is always in contact with the annular flange 9 while sliding within the slide groove 10, thus ensuring the stability and balance of the entire system. The left support end plate 7 and the right support end plate 8 define and form a sealed roller 2. Therefore, the design of the slide assembly effectively ensures the rotation of the roller and reduces friction during operation, making the roller run more smoothly.

[0023] Inside the drum 2, a driving screw 3 and a driven screw 4 are rotatably installed. The driving screw 3 and the driven screw 4 are arranged parallel to each other, and the driving screw 3 and the driven screw 4 are rotatably installed between the left support end plate 7 and the right support end plate 8 of the frame 1 through bearings 14, respectively. The driving screw 3 drives the driven screw 4 outside the drum 2 through a transmission mechanism. The transmission mechanism includes a first motor 11 installed on the frame 1. The main shaft of the first motor 11 is connected to the shaft end of the driving screw 3. Both the driving screw 3 and the driven screw 4 are provided with pulleys 12, and a belt 13 is installed on the pulleys 12 of the driving screw 3 and the driven screw 4. Because a belt 13 is mounted on the pulleys of both the driving and driven screws, connecting the two pulleys, the driving screw's pulley is connected to the main shaft of the first motor. When the motor starts, its main shaft rotates, simultaneously driving the driving screw's pulley to rotate as well. In this process, the belt only serves to transmit power, and its tension can be adjusted using a tensioning device, thus making the transmission mechanism operate more stably and reliably. The driving screw indirectly drives the driven screw's rotation through the belt and the driven screw's pulley in the transmission mechanism. The entire transmission process has advantages such as high reliability, low noise, and high efficiency.

[0024] Several claws 5 are arranged on the inner wall of the drum 2 to assist in cleaning the screw. The claws 5 are arranged in a ring array around the inner wall of the drum 2, and several groups are arranged axially along the inner wall of the drum 2. The claws 5 are elastic and made of sturdy rubber. The claw body of the claws 5 is facing the central axis of the drum 2. The head of the claws 5 is bent. All the claws 5 are bent in either the clockwise direction or the counterclockwise direction in the ring array.

[0025] A ring gear 6 is arranged circumferentially along the outer wall of the drum 2. The ring gear 6 meshes with the drive assembly to drive the drum 2 to rotate. Specifically, the drive assembly includes a second motor 15, a reducer 16 connected to the main shaft of the second motor 15, and a drive gear 17 meshing with the ring gear 6 mounted on the output shaft of the reducer 16. A feed inlet 18 is provided at the upper part of the right support end plate 8, and a discharge outlet 19 is provided at the center of the left support end plate 7. The discharge outlet 19 is inclined downwards, and a cutter 20 is provided at the outlet of the discharge outlet 19.

[0026] Therefore, this invention discloses a working method for a twin-screw granulator used in the production of nylon 66. The method involves using a driving screw and a driven screw in a drum to rotate and propel molten raw material. The rotating drum melts the raw material, which then presses against the back of the claws and adheres to the inner wall of the drum. The claws adhering to the inner wall of the drum, along with the driving and driven screws, create internal and external rotational mixing and molding conditions, gradually extruding the material to the discharge port. The material then cools and solidifies at the discharge port, forming the desired granular material that is then cut into pieces by a cutter. In simpler terms, the twin-screw granulator uses the rotating driving and driven screws in the drum to propel molten raw material. Simultaneously, the claws on the inner wall of drum 2 adhere to the molten material, and with the rotation of the drum, internal and external rotational mixing and molding occur. Finally, the material cools and solidifies at the discharge port, forming the desired granular material that is then cut into pieces by a cutter. The addition of a ring gear and a drive assembly enables the rotation of the drum. It is important to note that the direction of the drum's rotation depends on the direction in which the heads of the claws bend. The necessary condition is that the molten material must rotate on the back of the claws, and the heads of the claws must be pressed against the inner wall of the drum. The thickness of the claws will then create a stirring effect on the molten material.

[0027] The benefits of the above method are:

[0028] I. High-efficiency production: Compared with the traditional internal stirring method, the twin-screw granulator can efficiently propel the molten raw materials and shape them through internal and external rotation and stirring, thereby achieving high-efficiency production.

[0029] II. High-quality products: Twin-screw granulators can produce granular materials with stable quality and high consistency by adjusting the shape and number of the claws on the inner wall of the drum, as well as controlling parameters such as the rotation speed and temperature of the drum, because the mixing is more uniform.

[0030] Third, it can handle a variety of raw materials: The internal and external rotary mixing and molding of the twin-screw granulator can handle a variety of types of molten raw materials, including polymer materials, plastics, chemical derivatives, etc., which improves the flexibility of the process and production efficiency.

[0031] IV. Reduced Energy Consumption: Utilizing internal and external rotating stirring and molding to propel molten raw materials can improve production efficiency, reduce production costs, and decrease energy consumption.

[0032] 5. Reduced waste generation: The internal and external rotary mixing molding process enables precise mixing of molten raw materials, reducing waste generation and improving resource utilization.

[0033] Meanwhile, this invention discloses a cleaning method for a twin-screw granulator used in the production of nylon 66. The cleaning method involves using the rotation of the driving and driven screws in the drum to push out molten raw material, while the rotating claws in the drum scrape the molten material adhering to the driving and driven screws. This scraping action propels the molten material along the spiral blades of the driving and driven screws towards the discharge port. During the drum's rotation, the claws, due to the angled bending of their heads, can scrape the molten material adhering to the driving and driven screws as they rotate on the drum surface. The claws possess a certain degree of elasticity, thus creating a scraping effect upon contact with the molten material. Typically, the molten material accumulates on the outer edge of the spiral blades under the centrifugal force generated by the rotation of the driving and driven screws. The combined action of the rotating driving and driven screws and the rotating drum propels the material along the spiral blades towards the discharge port under the action of the claws. In this way, the combined action of the claws and the drum effectively cleans the molten material on the driving and driven screws. It is important to note that the direction of the drum's rotation also depends on the direction in which the heads of the claws bend. The necessary condition is that the molten material must be in contact with the front of the claws, using the elasticity of the claws to create a scraping effect on the molten material.

[0034] The benefits of the above method are:

[0035] 1. Excellent cleaning effect: The screw and claws in the drum clean the granulator, which can thoroughly remove the raw materials and impurities left inside the machine during the production process, ensuring a clean and hygienic production environment and guaranteeing production quality.

[0036] 2. Reduced cleaning time: The granulator can be cleaned using the screw and claws in the drum without disassembling the machine, reducing the time and cost of cleaning and disassembly, and improving production efficiency.

[0037] Third, energy saving: Using the screw and claws in the drum to clean the granulator can make full use of the heat energy inside the machine, so that it can play an energy utilization role in the cleaning process and reduce energy waste and loss.

[0038] IV. Extending Machine Life: Regular cleaning and maintenance of the granulator can effectively prevent machine damage and malfunctions, extend machine life, reduce production costs, and improve production efficiency.

[0039] The above embodiments are not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the technical solutions of the present invention are also within the protection scope of the present invention.

Claims

1. A twin-screw granulator for producing nylon 66, comprising a frame (1), characterized in that: A roller (2) that rotates circumferentially via a slide assembly is sandwiched between the frames (1). An active screw (3) and a driven screw (4) are rotatably installed inside the roller (2). The active screw (3) drives the driven screw (4) outside the roller (2) via a transmission mechanism. Several claws (5) for assisting in cleaning the screw are on the inner wall of the roller (2). The claws (5) are arranged in a circumferential ring array on the inner wall of the roller (2) as a group, and several groups are arranged axially along the inner wall of the roller (2). A ring gear (6) is arranged around the outer wall of the drum (2). The ring gear (6) meshes with the drive assembly to drive the drum (2) to rotate. The frame (1) has a left support end plate (7) and a right support end plate (8). The slide assembly includes an annular flange (9) located at the edges of the left support end plate (7) and the right support end plate (8), and a slide groove (10) at the side end of the roller (2) that matches the annular flange (9) at the edges of the left support end plate (7) and the right support end plate (8). The claws (5) are elastic, and the claws (5) are all facing the central axis of the roller (2). The heads of the claws (5) are bent, and all the claws (5) are bent in either the clockwise direction or the counterclockwise direction in the annular array. During operation, the active and driven screws in the drum rotate and propel the molten raw material. The drum rotates and melts the raw material. The molten raw material is squeezed against the back of the claws and makes it stick to the inner wall of the drum. The claws sticking to the inner wall of the drum, together with the active and driven screws, form internal and external rotational mixing and molding conditions, and are gradually squeezed to the discharge port. The material is cooled and shaped through the discharge port and then cut into the required granular material using a cutter. During cleaning, the active and driven screws in the drum rotate to push out the molten material, and the front of the claws in the drum rotates to scrape the molten material that is attached to the active and driven screws, so that the molten material is pushed towards the discharge port along the spiral blades on the active and driven screws under the scraping action.

2. The twin-screw granulator for producing nylon 66 according to claim 1, characterized in that: The transmission mechanism includes a first motor (11) mounted on the frame (1). The main shaft of the first motor (11) is connected to the shaft end of the active screw (3). Both the active screw (3) and the driven screw (4) are provided with pulleys (12). A belt (13) is installed on the pulleys (12) of the active screw (3) and the driven screw (4).

3. The twin-screw granulator for producing nylon 66 according to claim 1, characterized in that: The active screw (3) and the driven screw (4) are arranged in parallel to each other, and the active screw (3) and the driven screw (4) are respectively rotatably installed between the left support end plate (7) and the right support end plate (8) of the frame (1) through bearings (14).

4. The twin-screw granulator for producing nylon 66 according to claim 1, characterized in that: The drive assembly includes a second motor (15), a reducer (16) is connected to the main shaft of the second motor (15), and a drive gear (17) that meshes with the ring gear (6) is installed on the output shaft of the reducer (16).

5. The twin-screw granulator for producing nylon 66 according to claim 1, characterized in that: The upper part of the right support end plate (8) is provided with a feed inlet (18), and the center of the left support end plate (7) is provided with a discharge outlet (19).

6. The twin-screw granulator for producing nylon 66 according to claim 5, characterized in that: The discharge port (19) is inclined downward, and the outlet of the discharge port (19) is provided with a cutter (20).

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