Improved device of double-screw extruder

Abstract

The utility model discloses an improved device of a double-screw extruder, which relates to the field of plastic extrusion equipment and comprises a machine body with a heating element, two extrusion screw rods arranged in the machine body, a feed port arranged at one end of the machine body and an extrusion die head arranged at the other end of the machine body. The machine is characterized in that the machine body comprises a base and a plurality of extrusion barrels arranged on the base, and further comprises a cleaning mechanism arranged on the base, and the extrusion barrels are connected end to end along a central shaft; according to the screw rod cleaning device, strong scouring force of high-temperature hot water is matched with rotation of the screw rod, the screw rod structure is not damaged, stains and residues on the screw rod are thoroughly removed, operation is easy and convenient, the effect is remarkable, meanwhile, cleaning cost is reduced, production efficiency is improved, in addition, the high-temperature hot water has the sterilization and disinfection effect, and the service life of the screw rod is prolonged. Guarantee is provided for subsequent use of the extruder, and the high-pressure air injection nozzle is used for drying the screw rod; and meanwhile, the inner wall of the extrusion barrel can be conveniently cleaned by a worker through the openable structural design of the extrusion barrel.

Description

Technical Field

[0001] This utility model relates to the field of plastic extrusion equipment, specifically to an improved device for a twin-screw extruder. Background Technology

[0002] Twin-screw extruders were developed based on single-screw extruders. Due to their excellent feeding performance, mixing and plasticizing performance, venting performance, and extrusion stability, they are now widely used in the molding and processing of extruded products. With social development, the application of twin-screw extruders, which are easy to clean, is becoming more and more widespread.

[0003] During the extrusion process, plastic raw materials remain on the screw surface and gradually solidify, forming an adhesive. When the screw heats up, the residual material adhering to the screw surface forms carbonized lumps. This not only causes the screw to jam during operation but also allows the lumps to be trapped in the molten raw material, affecting product quality. Therefore, the screw needs to be cleaned regularly to keep its surface clean, making the extrusion process more reliable and improving product quality. However, most twin-screw extruders on the market are not convenient for cleaning the screw and the inner wall of the machine. They require manual disassembly by workers, which is time-consuming and labor-intensive. After cleaning, the barrel must be reassembled, which is inefficient and wastes a lot of manpower and time. Utility Model Content

[0004] The purpose of this invention is to provide an improved device for a twin-screw extruder, which aims to solve the problem of inconvenience in cleaning the screw in the aforementioned background technology.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an improved device for a twin-screw extruder, comprising a body with a heating element, two extrusion screws disposed within the body, a feed inlet at one end of the body, and an extrusion die at the other end of the body. The body includes a base and several extrusion cylinders disposed on the base, and also includes a cleaning mechanism disposed on the base. The extrusion cylinders are connected end to end along a central axis. Each extrusion cylinder includes a bottom beam, a first housing, and two second housings. The bottom beam has two sections spaced apart on the base along the extrusion direction. The first housing is disposed on the base and its two ends are fixedly connected to the two bottom beams respectively. The two second housings are symmetrically arranged and one end is hinged to the two bottom beams respectively, and the other end is snapped together. The two second housings are closed by a clamping unit disposed on the base, forming a cylindrical structure with an internal cavity after closure.

[0006] Furthermore, the cleaning mechanism includes a mounting frame, a high-pressure air jet nozzle, a high-pressure water jet nozzle, an air compressor, a heating water tank, and a power assembly mounted on a base. The mounting frame has an inverted L-shaped structure design, with its bottom end fixedly mounted on the power assembly. An electric actuator is vertically mounted on the free end of the mounting frame. Both the high-pressure air jet nozzle and the high-pressure water jet nozzle are located at the telescopic end of the electric actuator and act above the machine body. The high-pressure air jet nozzle is connected to the air outlet of the air compressor mounted on the machine body via a pipeline. The heating water tank is mounted on the machine body and contains a high-pressure water pump. The output end of the high-pressure water pump is connected to the high-pressure water jet nozzle via a pipeline, and the input end of the high-pressure water pump is fixedly connected to the heating water tank via a pipeline. The power assembly is used to drive the mounting frame to move axially along the extrusion screw.

[0007] Furthermore, the power assembly includes a motor and a linear motion module. The linear motion module includes a lead screw, a guide rod, and a moving plate. A linear groove is formed on the base along the axial direction of the extrusion screw. The lead screw is rotatably connected inside the linear groove. A guide rod is also provided in the linear groove symmetrically arranged with the lead screw. The motor is embedded in the base and its output end is fixedly connected to one end of the lead screw. The moving plate slides with the guide rod and is threadedly connected to the lead screw.

[0008] Furthermore, the clamping unit includes a hydraulic rod, the two ends of which are respectively hinged to the outer wall of the second housing of the extrusion cylinder and the top of the base.

[0009] Furthermore, the spiral blades on the two extrusion screws are staggered and driven to rotate synchronously in the same direction by a power mechanism outside the machine body, forming a co-rotating twin-screw extrusion structure. The spiral blades on the two extrusion screws are divided into a feeding section, a compression section, a mixing section and an extrusion section from the feed port to the extrusion die.

[0010] This utility model has the following beneficial effects:

[0011] This invention provides an improved device for a twin-screw extruder. Through a cleaning mechanism on the base, the powerful flushing force of high-temperature hot water, combined with the screw's rotation, thoroughly removes stains and residues from the screw without damaging its structure. This device is not only easy to operate and highly effective, but also economical, reducing cleaning costs and improving production efficiency. Furthermore, the high-temperature hot water has a sterilization and disinfection effect, ensuring the extruder's continued operation. High-pressure jet nozzles dry the screw, and the openable design of the extrusion barrel facilitates cleaning of its inner wall. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 This is a side structural cross-sectional view of the present invention;

[0014] Figure 3 This is a schematic diagram of the structure of some of the cleaning mechanisms in this utility model;

[0015] In the diagram: 1. Extrusion screw; 2. Feed inlet; 3. Extrusion die; 4. Base; 5. Extrusion cylinder; 51. Bottom beam; 52. First housing; 53. Second housing; 6. Mounting bracket; 7. High-pressure air jet nozzle; 8. High-pressure water jet nozzle; 9. Air compressor; 10. Heating water tank; 11. Motor; 12. Lead screw; 13. Guide rod; 14. Moving plate; 15. Hydraulic rod; 16. Electric actuator. Detailed Implementation

[0016] like Figures 1 to 3 As shown, an improved device for a twin-screw extruder includes a body with heating elements, two extrusion screws 1 disposed within the body, a feed inlet 2 at one end of the body, and an extrusion die 3 at the other end of the body. The body includes a base 4 and several extrusion cylinders 5 disposed on the base 4, and also includes a cleaning mechanism disposed on the base 4. The extrusion cylinders 5 are connected end to end along a central axis. Each extrusion cylinder 5 includes a bottom beam 51, a first housing 52, and two second housings 53. The bottom beam 51 has two sections and is spaced apart on the base 4 along the extrusion direction. The first housing 52 is disposed on the base 4 and its two ends are fixedly connected to the two bottom beams 51 respectively. The two second housings 53 are symmetrically arranged and one end is hinged to the two bottom beams 51 respectively, and the other end is snapped together. The two second housings 53 are closed by a clamping unit disposed on the base 4, forming a cylindrical structure with an internal cavity after closure. Heating elements for plastic melting are disposed inside the first and second housings.

[0017] The other ends of the two second housings 53 are respectively provided with matching slots and plugs. A sliding groove is provided on one side of the slot, and a spring is provided inside the sliding groove. One end of the spring is fixedly connected to a snap-fit ​​block. The snap-fit ​​block is angled towards the slot opening. A snap-fit ​​groove that matches the snap-fit ​​block is provided on one side of the plug. A pull rod is fixedly installed on the end of the snap-fit ​​block near the spring.

[0018] The cleaning mechanism includes a mounting frame 6, a high-pressure air nozzle 7, a high-pressure water nozzle 8, an air compressor 9, a heating water tank 10, and a power unit mounted on the base 4. The mounting frame 6 has an inverted L-shaped structure and its bottom end is fixedly mounted on the power unit. An electric actuator 16 is vertically mounted on the free end of the mounting frame 6. The high-pressure air nozzle 7 and the high-pressure water nozzle 8 are both located at the telescopic end of the electric actuator 16 and act above the machine body. The high-pressure air nozzle 7 is connected to the air outlet of the air compressor 9 mounted on the machine body through a pipeline. The heating water tank 10 is mounted on the machine body and contains a high-pressure water pump. The output end of the high-pressure water pump is connected to the high-pressure water nozzle 8 through a pipeline, and the input end of the high-pressure water pump is fixedly connected to the heating water tank 10 through a pipeline. The power unit is used to drive the mounting frame 6 to move axially along the extrusion screw. The electric actuator 16 brings the nozzle closer to the extrusion screw 1, further improving the cleaning effect.

[0019] The power assembly includes a motor 11 and a linear motion module. The linear motion module includes a lead screw 12, a guide rod 13, and a moving plate 14. A linear groove is provided on the base 4 along the axial direction of the extrusion screw. The lead screw 12 is rotatably connected inside the linear groove. The guide rod 13 is also provided in the linear groove symmetrically arranged with the lead screw 12. The motor 11 is embedded in the base 4 and its output end is fixedly connected to one end of the lead screw 12. The moving plate 14 is slidably engaged with the guide rod 13 and threadedly connected to the lead screw 12. The motor 11 can drive the mounting frame 6 to slide laterally in the linear groove. The high-pressure jet nozzle 7 and the high-pressure water jet nozzle 8 are arranged sequentially along the moving direction. After hot water spray cleaning, the high-pressure jet nozzle 7 dries the cleaned screw and the inner wall of the machine body and blows out the residual clumps from the machine body.

[0020] The clamping unit includes a hydraulic rod 15, with its two ends hinged to the outer wall of the second housing of the extrusion cylinder and the top of the base 4, respectively.

[0021] The spiral blades on the two extrusion screws 1 are staggered and driven to rotate synchronously in the same direction by the power mechanism outside the machine body, forming a twin-screw extrusion structure with co-rotating meshing. The spiral blades on the two extrusion screws 1 are divided into feeding section, compression section, mixing section and extrusion section from the feed port 2 to the extrusion die 3.

[0022] The specific operation process of this utility model is as follows:

[0023] When in use, close the bottom feed port 2 of the hopper to stop feeding, reduce the screw speed to 15 to 25 r / min, wait for the melt at the front end of the extrusion die 3 to be discharged, remove the extrusion die 3 from the other end of the machine body, start all hydraulic rods 15 to work and drive the second housing 53 of the extrusion cylinder 5 to open to both sides, so that the extrusion screw 2 and the inner wall inside the machine body are exposed, and the extrusion screw 1 continues to rotate; turn on the heating water tank 10 to heat the water in the tank, extend the telescopic rod 16 to bring the nozzle close to the surface of the extrusion screw 1, start the high-pressure water pump to spray water under high pressure. The head 8 flushes the extrusion screw 1. The mounting frame 6 drives the high-pressure water spray nozzle 8 to move slowly along the axial direction of the extrusion screw. The dirt and residue on the screw fall off and are discharged from the other end of the machine body along the surface of the first housing 52 with the water flow. After cleaning, the high-pressure water pump is turned off, and the motor 11 is started to reverse so that the mounting frame 6 slowly returns to its original position. At the same time, the air compressor 9 dries the cleaned extrusion screw 2 through the high-pressure air jet nozzle 7. After the screw cleaning is completed, the staff can clean the dirt and residue on the inner wall of the cylinder more carefully and thoroughly.

Claims

1. An improved device for a twin-screw extruder, comprising a body with a heating element, two extrusion screws (1) disposed within the body, a feed inlet (2) at one end of the body, and an extrusion die (3) at the other end of the body, characterized in that: The machine body includes a base (4) and several extrusion cylinders (5) on the base (4), and also includes a cleaning mechanism on the base (4). The extrusion cylinders (5) are connected end to end along the central axis. The extrusion cylinder (5) includes a bottom beam (51), a first housing (52) and two second housings (53). The bottom beam (51) has two beams and is spaced apart on the base (4) along the extrusion direction. The first housing (52) is on the base (4) and its two ends are fixedly connected to the two bottom beams (51) respectively. The two second housings (53) are symmetrically arranged and one end is hinged to the two bottom beams (51) respectively, and the other end is snapped together. The two second housings (53) are closed by a clamping unit on the base (4) to form a cylindrical structure with an internal cavity after closing.

2. An improved apparatus for a twin-screw extruder according to claim 1, characterized in that, The cleaning mechanism includes a mounting frame (6), a high-pressure jet nozzle (7), a high-pressure water nozzle (8), an air compressor (9), a heating water tank (10), and a power assembly mounted on a base (4). The mounting frame (6) is an inverted L-shaped structure. The bottom end of the mounting frame (6) is fixedly mounted on the power assembly. An electric push rod (16) is vertically mounted on the free end of the mounting frame (6). The high-pressure jet nozzle (7) and the high-pressure water nozzle (8) are both located at the telescopic end of the electric push rod (16) and act above the machine body. The high-pressure jet nozzle (7) is connected to the air outlet of the air compressor (9) mounted on the machine body through a pipeline. The heating water tank (10) is mounted on the machine body and contains a high-pressure water pump. The output end of the high-pressure water pump is connected to the high-pressure water nozzle (8) through a pipeline. The input end of the high-pressure water pump is fixedly connected to the heating water tank (10) through a pipeline. The power assembly is used to drive the mounting frame (6) to move axially along the extrusion screw.

3. An improved apparatus for a twin-screw extruder according to claim 2, characterized in that, The power assembly includes a motor (11) and a linear motion module. The linear motion module includes a lead screw (12), a guide rod (13), and a moving plate (14). A linear groove is provided on the base (4) along the axial direction of the extrusion screw. The lead screw (12) is rotatably connected inside the linear groove. The guide rod (13) is also provided in the linear groove symmetrically arranged with the lead screw (12). The motor (11) is embedded in the base (4) and its output end is fixedly connected to one end of the lead screw (12). The moving plate (14) is slidably engaged with the guide rod (13) and threadedly connected to the lead screw (12).

4. An improved apparatus for a twin-screw extruder according to claim 1, characterized in that, The clamping unit includes a hydraulic rod (15), the two ends of which are hinged to the outer wall of the second housing of the extrusion cylinder and the top of the base (4), respectively.

5. An improved apparatus for a twin-screw extruder according to claim 1, characterized in that, The spiral blades on the two extrusion screws (1) are staggered and driven to rotate synchronously in the same direction by the power mechanism outside the machine body, forming a twin-screw extrusion structure with co-rotating. The spiral blades on the two extrusion screws (1) are divided into feeding section, compression section, mixing section and extrusion section from the feed port (2) to the extrusion die (3).

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