Three-screw-to-double-screw extruder

Abstract

The utility model relates to the technical field of extruders, in particular to a three-screw-to-double-screw extruder which comprises a base, a mounting cylinder is mounted above the base, three screws are mounted in the mounting cylinder, distributed in a triangular shape and meshed with one another, a feeding cylinder is communicated above the mounting cylinder, an anti-blocking component is arranged in the feeding cylinder, and a screw rod is mounted in the feeding cylinder. A first vacuum pump is installed above the installation cylinder, the upper portion and the left side of the first vacuum pump are communicated with a first air outlet pipe and a second middle pipe respectively, a second vacuum pump is installed on the rear side of the installation cylinder, the front side and the rear side of the second vacuum pump are communicated with a first middle pipe and a feeding pipe respectively, and the first middle pipe and the second middle pipe are both communicated with the feeding cylinder. The lower end of the corrugated pipe communicates with a feeding head, a first electromagnetic valve is installed outside the feeding pipe, and a second electromagnetic valve is installed outside the second middle pipe. The raw material extrusion is more uniform and stable, meanwhile, the trouble that a user climbs to feed materials is reduced, and the feeding is more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of extruders and discloses a three-screw-to-twin-screw extruder. Background Art

[0002] Extruder is a common plastic processing machine. The three-screw extruder is developed from the single-screw extruder. The three-screw extruder has a larger shearing force when extruding raw materials. Compared with the ordinary twin-screw extruder, the speed and efficiency of extruding raw materials are higher, and the efficiency of mixing raw materials is higher. The three-screw extruder is equipped with three rotatable screws. When working, the raw materials are added from the feeding pipe of the three-screw extruder into the inner cavity where the screws are installed, and the raw materials are extruded under the action of the three screws;

[0003] The technology of existing three-screw extruders is not yet mature. Compared with twin-screw extruders, the uniformity and stability of raw materials extruded by three-screw extruders are weaker, and the feed inlet of the extruder is usually set high, usually requiring the help of external ladders and other components to climb up and add materials. Adding materials is inconvenient and inefficient, and the raw materials are also prone to blockage at the feeding pipe. Utility Model Content

[0004] The purpose of the utility model is to provide a three-screw to twin-screw extruder in view of the above-mentioned problems and shortcomings, so that the raw material extrusion is more uniform and stable, and the trouble of users climbing up to add materials is reduced, and the addition of materials is more convenient.

[0005] A three-screw to twin-screw extruder comprises a base, and a mounting barrel is mounted on the base;

[0006] Three screws are installed inside the installation cylinder, the three screws are distributed in a triangular shape and mesh with each other, a feed cylinder is connected above the installation cylinder, and an anti-blocking component is provided inside the feed cylinder;

[0007] A vacuum pump 1 is installed above the mounting cylinder, and an air outlet pipe 1 and an intermediate pipe 2 are connected to the top and left of the vacuum pump 1 respectively; a vacuum pump 2 is installed on the rear side of the mounting cylinder, and an intermediate pipe 1 and a feed pipe are connected to the front and rear sides of the vacuum pump 2 respectively; both the intermediate pipe 1 and the intermediate pipe 2 are connected to the feed cylinder, and the lower end of the feed pipe is connected to a bellows, and the lower end of the bellows is connected to a feed head.

[0008] Furthermore, a solenoid valve 1 is installed outside the feed pipe, a solenoid valve 2 is installed outside the intermediate pipe 2, and a filter located on the left side of the solenoid valve 2 is connected to the left end of the intermediate pipe 2.

[0009] Furthermore, the length of the upper screw is smaller than the length of the two lower screws, and the interior of the installation cylinder is trapezoidal.

[0010] Furthermore, the anti-blocking component includes a motor, a rotating rod and a blade, and the motor is installed above the feed barrel.

[0011] Furthermore, the rotating rod is connected to the power output end of the motor and inserted into the inside of the feeding barrel, and the blade is provided with a plurality of evenly distributed blocks and connected to the outside of the rotating rod.

[0012] Beneficial effects:

[0013] First, the user can grab the feed head and insert it into the raw material. The bellows connected to the feed head can change its angle, so it can be conveniently inserted into the raw material at various angles. While the vacuum pump sucks the raw material, the motor drives several blades to rotate, and the blades can cut and stir the raw material, which can effectively reduce the particle size of the raw material and avoid clogging the feed barrel. Stirring can prevent the raw material from accumulating in the feed barrel and causing clogging, thereby further effectively avoiding clogging of the raw material during feeding, reducing the trouble of users climbing up to add materials, and making adding materials more convenient;

[0014] The three screws can rotate to melt, shear and extrude the raw materials. The three screws in a triangular shape can extrude and mix the raw materials efficiently and quickly. When the raw materials are extruded and transported to the right end of the installation barrel by the three screws, the two screws can continue to shear and extrude the raw materials. The extrusion force of the two screws on the raw materials is smaller than that of the three screws on the raw materials. The materials can be evenly and stably extruded from the right end of the installation barrel, which can not only improve the extrusion efficiency but also ensure the stability and uniformity of the raw materials after extrusion;

[0015] Open solenoid valve 2 and close solenoid valve 1, evacuate the interior of the installation cylinder through vacuum pump 1, connect air outlet pipe 1 with the exhaust gas treatment device, and the air inhaled by vacuum pump 1 can be discharged into the exhaust gas treatment device through air outlet pipe 1, effectively preventing harmful gases generated by the melting of raw materials from affecting the health of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall main cross-sectional structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the right side cross-sectional structure of the installation tube of the utility model;

[0018] Figure 3 For this utility model Figure 1 A is a schematic diagram of a local enlarged structure.

[0019] Markings in the figure: base 1, mounting barrel 2, screw 3, feed barrel 4, vacuum pump 1 5, outlet pipe 1 6, motor 7, vacuum pump 2 8, intermediate pipe 1 9, feed pipe 10, bellows 11, feed head 12, rotating rod 13, blade 14, solenoid valve 1 15, intermediate pipe 2 16, solenoid valve 2 17, filter 18. DETAILED DESCRIPTION

[0020] like Figures 1 to 3 As shown, the present application is a three-screw to twin-screw extruder, comprising a base 1, a mounting barrel 2 is mounted on the base 1, three screws 3 are mounted inside the mounting barrel 2, the three screws 3 are triangularly distributed and meshed with each other, a feed barrel 4 is connected above the mounting barrel 2, and an anti-blocking component is arranged inside the feed barrel 4;

[0021] A vacuum pump 5 is installed above the installation cylinder 2, and an air outlet pipe 6 and an intermediate pipe 2 16 are connected to the upper and left sides of the vacuum pump 5, respectively. A vacuum pump 2 8 is installed at the rear side of the installation cylinder 2, and the front and rear sides of the vacuum pump 2 8 are connected to an intermediate pipe 9 and a feed pipe 10, respectively. The intermediate pipe 1 9 and the intermediate pipe 2 16 are both connected to the feed cylinder 4, and the lower end of the feed pipe 10 is connected to a bellows 11, and the lower end of the bellows 11 is connected to a feed head 12;

[0022] The feed pipe 10 is externally installed with a solenoid valve 15, the intermediate pipe 16 is externally installed with a solenoid valve 17, and the intermediate pipe 16 is internally connected to a filter screen 18 located on the left side of the solenoid valve 17 at the left end thereof;

[0023] When the three-screw to twin-screw extruder is in use, Figure 2 As shown, first, the user can grab the feed head 12 and insert it into the raw material. The bellows 11 connected to the feed head 12 can change its angle, so it can be conveniently inserted into the raw material at various angles. The solenoid valve 15 is opened, and the vacuum pump 28 is connected to an external power supply. The vacuum pump 28 can then suck the raw material through the feed pipe 10, the bellows 11 and the feed head 12 in sequence. The vacuum pump 28 then pumps the raw material into the feed barrel 4 through the intermediate pipe 9, which is convenient for subsequent feeding.

[0024] The anti-blocking assembly includes a motor 7, a rotating rod 13 and a blade 14. The motor 7 is installed above the feed barrel 4. The rotating rod 13 is connected to the power output end of the motor 7 and inserted into the feed barrel 4. The blade 14 is provided with a plurality of evenly distributed blocks and is connected to the outside of the rotating rod 13.

[0025] When the user sucks the raw material through the vacuum pump 28, the motor 7 is connected to the external power supply, and the motor 7 can drive the rotating rod 13 to rotate. At this time, the plurality of blades 14 connected to the outside of the rotating rod 13 can rotate. When the vacuum pump 28 pumps the raw material into the feed barrel 4, the plurality of blades 14 can cut and stir the raw material, which can effectively reduce the particle size of the raw material and avoid clogging the feed barrel 4. Stirring can prevent the raw material from accumulating in the feed barrel 4 and causing clogging, thereby further effectively avoiding clogging of the raw material when feeding, reducing the trouble of users climbing up to add materials, and making it more convenient to add materials.

[0026] The length of the upper screw rod 3 is shorter than the length of the two lower screw rods 3, and the interior of the installation cylinder 2 is trapezoidal;

[0027] like Figure 1 and 2 As shown, the raw material can fall into the inside of the installation barrel 2 after passing through the feed barrel 4. When the three-screw to twin-screw extruder is working, the three screws 3 can rotate to melt, shear and extrude the raw materials. The three screws 3 in a triangular shape can extrude and mix the raw materials efficiently and quickly. When the raw materials are extruded and transported to the right end of the inside of the installation barrel 2 by the three screws 3, the two screws 3 can continue to shear and extrude the raw materials. The extrusion force when the two screws 3 extrude the raw materials is smaller than that when the three screws 3 extrude the raw materials. The material can be evenly and stably extruded from the right end of the installation barrel 2, which can not only improve the extrusion efficiency but also ensure the stability and uniformity of the raw materials after extrusion.

[0028] While adding the raw materials, connect the vacuum pump 15 to the external power supply and open the solenoid valve 217. Figure 1 and Figure 3 As shown, the vacuum pump 5 can suck the air inside the installation cylinder 2 through the intermediate tube 2 16, and the filter 18 connected to the inside of the intermediate tube 2 16 can prevent the vacuum pump 5 from sucking in the raw materials. At this time, the excessive air pressure inside the installation cylinder 2 can be prevented from affecting the feeding. When the three screws 3 are working and the feeding is stopped, the solenoid valve 15 is closed. At the same time, the vacuum pump 5 can evacuate the inside of the installation cylinder 2, and the air outlet pipe 6 is connected to the exhaust gas treatment device. The air sucked by the vacuum pump 5 can be discharged into the exhaust gas treatment device through the air outlet pipe 6, which effectively prevents the harmful gases generated by the melting of the raw materials from affecting the health of the users.

Claims

1. A three-screw to twin-screw extruder, comprising a base (1), a mounting barrel (2) being mounted above the base (1), characterized in that: Three screw rods (3) are installed inside the installation cylinder (2), and the three screw rods (3) are distributed in a triangle and mesh with each other. A feed cylinder (4) is connected above the installation cylinder (2), and an anti-blocking component is provided inside the feed cylinder (4); A vacuum pump (5) is installed above the installation cylinder (2), and an air outlet pipe (6) and an intermediate pipe (16) are connected to the top and left of the vacuum pump (5) respectively. A vacuum pump (8) is installed on the rear side of the installation cylinder (2), and the front and rear sides of the vacuum pump (8) are connected to an intermediate pipe (9) and a feed pipe (10) respectively. Both the intermediate pipe (9) and the intermediate pipe (16) are connected to the feed cylinder (4), and the lower end of the feed pipe (10) is connected to a bellows (11), and the lower end of the bellows (11) is connected to a feed head (12).

2. A three-screw to twin-screw extruder according to claim 1, characterized in that: The feed pipe (10) is externally mounted with a solenoid valve 1 (15), the intermediate pipe (16) is externally mounted with a solenoid valve 2 (17), and the left end of the intermediate pipe (16) is connected to a filter screen (18) located on the left side of the solenoid valve 2 (17).

3. A three-screw to twin-screw extruder according to claim 1, characterized in that: The length of the upper screw rod (3) is shorter than the lengths of the two lower screw rods (3), and the interior of the installation cylinder (2) is trapezoidal.

4. A three-screw to twin-screw extruder according to claim 1, characterized in that: The anti-blocking component comprises a motor (7), a rotating rod (13) and a blade (14), and the motor (7) is installed above the feed barrel (4).

5. A three-screw to twin-screw extruder according to claim 4, characterized in that: The rotating rod (13) is connected to the power output end of the motor (7) and inserted into the inside of the feeding cylinder (4); the blade (14) is provided with a plurality of evenly distributed pieces and is connected to the outside of the rotating rod (13).

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