Underwater pelletizing device

Abstract

The underwater pelletizing device comprises a feeding pipe, a main pipeline, a main box body, a plurality of partition plates, a plurality of rotary cutters, a motor and a magnetic coupling assembly, the partition plates parallel to one another are vertically arranged in the main box body, a gap is formed between every two adjacent partition plates, and the partition plates and the main box body form an interlayer with a downward opening; a first cavity is formed in the partition plate, and a plurality of first discharging openings communicating with the first cavity are formed in the side face of the partition plate side by side. The main pipeline is horizontally arranged in the main box body and sequentially penetrates through the centers of the partition plates, and the main pipeline communicates with the first cavity; the rotary cutter is rotationally connected with the main pipeline, and the rotating surface of the rotary cutter is attached to the plane where the first discharging opening is located; and the magnetic coupling assembly is fixedly connected with the rotary cutter. The problem that the working speed of a baffle provided with a plurality of discharging ports and a rotary cutter is low is solved, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of pelletizing equipment, and particularly to an underwater pelletizing device. Background Art

[0002] A pelletizer is a device that cuts materials in a molten or semi-molten state, such as plastics, rubbers, and chemical materials, into granular products through a specific process, and is widely used in fields such as plastic recycling, modified plastic production, rubber processing, and chemical raw material preparation. In the prior art, a pelletizer generally includes a baffle plate provided with a plurality of discharge holes and a rotatably arranged rotary cutter. Since the diameter of the pellets is limited, the extrusion amount of the material from the discharge holes is limited. Therefore, a pelletizer with higher efficiency is needed. Summary of the Invention

[0003] Aiming at the deficiencies in the prior art, the present invention provides an underwater pelletizing device, which solves the problem of low working efficiency of a baffle plate provided with a plurality of discharge ports and a rotary cutter in the prior art.

[0004] According to an embodiment of the present invention, an underwater pelletizing device includes a feeding pipe, a main pipe, a main box body, a plurality of partition plates, a plurality of rotary cutters, a motor, and a magnetic coupling assembly. A plurality of mutually parallel partition plates are vertically arranged inside the main box body, and there is a gap between adjacent partition plates. The partition plates and the main box body form a sandwich layer with an opening downward. A first cavity is arranged inside the partition plates, and a plurality of first discharge ports communicating with the first cavity are arranged side by side on the side surface of the partition plates. The main pipe is horizontally arranged inside the main box body and sequentially passes through the centers of the partition plates, and the main pipe is communicated with the first cavity. The rotary cutter is rotatably connected to the main pipe, and the rotation plane of the rotary cutter fits the plane where the first discharge ports are located. The magnetic coupling assembly is fixedly connected to the rotary cutter and is used to drive a plurality of rotary cutters to rotate synchronously. The motor is fixedly arranged outside the main box body and is used to drive the magnetic coupling assembly to rotate. An inlet is arranged at the top of the sandwich layer, and an outlet is arranged at the bottom of the main box body. The feeding pipe is fixedly arranged outside the main box body, and one end of the feeding pipe is communicated with the main pipe.

[0005] The technical principle of the present invention is as follows: After the material is conveyed into the plurality of partition plates, it is discharged in parallel from a plurality of discharge holes, and then the rotary wire cutting is completed to perform the pelletizing operation, thereby improving the efficiency.

[0006] Preferably, the rotary cutter includes a tool holder and a plurality of blades. The tool holder is a radial structure, and the center of the tool holder is rotatably connected to the main pipe. The blades are fixedly arranged on the tool holder, and the side edges of the blades are attached to the partition plates.

[0007] Preferably, the magnetic coupling assembly includes a connecting pipe and a plurality of permanent magnets. The connecting pipe is sleeved outside the main pipe, and both ends of the connecting pipe are fixedly connected to the tool holders at the left and right ends of the same interlayer respectively. The permanent magnets are fixedly arranged on the tool holders, and the magnetic poles of the permanent magnets are alternately arranged in sequence along the circumferential direction of the tool holders; a rotating disk is fixedly arranged on the output shaft of the motor, and permanent magnets matched with the tool holders are arranged around the rotating disk.

[0008] Preferably, a first spiral blade is arranged in the feeding pipe; the main pipe is a stepped tapered pipe, and the larger-diameter end of the main pipe is connected to the feeding pipe; a second spiral blade is arranged in the main pipe, and the diameter of the second spiral blade is adapted to the inner diameter of the main pipe; the second spiral blade is coaxial and fixedly connected with the first spiral blade, and the other end of the second spiral blade is rotatably connected to the inside of the main box body.

[0009] Preferably, a filter for separating particulate matter from liquid is arranged at the end of the water outlet, and the drain outlet of the filter is communicated with the water inlet.

[0010] Preferably, a second cavity and a second discharge port are arranged on the side wall of the main box body, and the second cavity is communicated with the main pipe.

[0011] Preferably, an annular limiting groove is arranged outside the main pipe, and a sliding connection key matched with the annular limiting groove is fixedly arranged on the tool holder.

[0012] Preferably, heating wires are arranged inside the first cavity and the second cavity.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The underwater pelletizing device realizes efficient and uniform material cutting and cooling effects through innovative structural design. Its core advantages are reflected in the adoption of a multi-partition layered structure. Through the cooperation of the internal cavities of the partitions and the lateral discharge ports, the molten material is evenly discharged after being split into each partition along the main pipe. Combined with the cutting method of the rotating cutter being attached to the plane of the discharge port, the production speed is significantly improved; the magnetic coupling drive technology is innovatively applied, and the internal rotating cutter is driven by an external motor to operate synchronously, completely solving the problem of easy leakage of traditional mechanical seals, reducing the maintenance cost at the same time, and ensuring the long-term stable operation of the equipment; an integrated water-cooling circulation system is integrated, and cooling water is injected through the interlayer water inlet to form a dynamic flow field, and the particles are cooled and conveyed synchronously during the cutting process, avoiding material adhesion and improving the finished product rate. The overall structure of the device is compact, with both sealing performance, high efficiency and process adaptability, and is particularly suitable for the underwater pelletizing scenario of polymer materials. Compared with traditional equipment, it can increase production, reduce energy consumption, and has significant value in improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1Schematic diagram of the overall structure of the present invention.

[0015] Figure 2 Schematic diagram of the rotary cutter of the present invention.

[0016] Figure 3 Schematic diagram of the main pipeline of the present invention.

[0017] In the above-mentioned drawings: 1, feeding pipe; 2, main box body; 3, water inlet; 4, second cavity; 5, second discharge port; 6, rotary cutter; 7, connecting pipe; 8, first spiral blade; 9, second spiral blade; 10, motor; 11, rotating disc; 12, blade; 14, tool rest; 15, first cavity; 16, first discharge port; 17, interlayer; 18, main pipeline; 19, water outlet; 20, partition board; 21, annular limiting groove. Specific embodiments

[0018] The technical solutions in the present invention will be further described below with reference to the drawings and embodiments.

[0019] As Figure 1 shown, an underwater pelletizing device is proposed in an embodiment of the present invention, including a feeding pipe 1, a main pipeline 18, a main box body 2, a plurality of partition boards 20, a plurality of rotary cutters 6, a motor 10 and a magnetic coupling assembly. A plurality of mutually parallel partition boards 20 are vertically arranged inside the main box body 2, and there is a gap between adjacent partition boards 20. The partition board 20 and the main box body 2 form an interlayer 17 with an opening downward. A first cavity 15 is arranged inside the partition board 20, and a plurality of first discharge ports 16 communicating with the first cavity 15 are arranged side by side on the side surface of the partition board 20. The main pipeline 18 is horizontally arranged inside the main box body 2 and sequentially passes through the centers of the partition boards 20. The main pipeline 18 is communicated with the first cavity 15, and the molten material enters the interlayer 17 from the first cavity 15 and the first discharge port 16. The rotary cutter 6 is rotatably connected to the main pipeline 18, and the rotation plane of the rotary cutter 6 fits the plane where the first discharge port 16 is located. When the material is extruded from the first discharge port 16, the rotary cutter 6 cuts the material into granular form. The magnetic coupling assembly is fixedly connected to the rotary cutter 6 and is used to drive a plurality of rotary cutters 6 to rotate synchronously. The motor 10 is fixedly arranged outside the main box body 2 and is used to drive the magnetic coupling assembly to rotate. The magnetic coupling assembly is used to prevent the liquid in the main box body 2 from overflowing. The top of the interlayer 17 is provided with a water inlet 3, and the bottom of the main box body 2 is provided with a water outlet 19. The feeding pipe 1 is fixedly arranged outside the main box body 2, and one end of the feeding pipe 1 is communicated with the main pipeline 18. In this embodiment, a detachable cover plate is arranged on the top of the main box body 2, and the partition board 20 and the main box body 2 are detachably connected by bolts. The feeding pipe 1 conveys the molten material to the main pipeline 18. The particles cut by the rotary cutter 6 are quickly cooled in the liquid.

[0020] As Figure 2 shown, preferably, the rotary cutter 6 includes a tool holder 14 and a plurality of blades 12. The tool holder 14 is of a radial structure, and the center of the tool holder 14 is rotatably connected to the main pipeline 18. The blades 12 are fixedly arranged on the tool holder 14, and the side edges of the blades 12 are in contact with the partition plate 20. An inclined surface is arranged on the side edge of the tool holder 14, and the side surface of the blade 12 is fixedly connected to the inclined surface. After long-term use, the blade 12 can be disassembled for maintenance and repair.

[0021] Preferably, the magnetic coupling assembly includes a connecting pipe 7 and a plurality of permanent magnets. The connecting pipe 7 is sleeved outside the main pipeline 18, and both ends of the connecting pipe 7 are fixedly connected to the tool holders 14 at the left and right ends of the same sandwich layer 17 respectively. The permanent magnets are fixedly arranged on the tool holders 14, and the magnetic poles of the permanent magnets are alternately arranged in sequence along the circumferential direction of the tool holder 14. A rotating disk 11 is fixedly arranged on the output shaft of the motor 10, and permanent magnets matching with the tool holders 14 are arranged around the rotating disk 11. In this embodiment, based on the principle of attraction between opposite sexes, through the alternate attraction of the magnetic poles of the permanent magnets and the rotating disk 11, the tool holder 14 on one side of the partition plate 20 can drive the tool holder 14 on the other side to rotate when rotating.

[0022] As Figure 1 、 3 shown, preferably, a first spiral blade 8 is arranged in the feeding pipe 1. The main pipeline 18 is a stepped tapered pipe, and the larger-diameter end of the main pipeline 18 is connected to the feeding pipe 1. A second spiral blade 9 is arranged in the main pipeline 18. The diameter of the second spiral blade 9 is adapted to the inner diameter of the main pipeline 18. The second spiral blade 9 is coaxial with and fixedly connected to the first spiral blade 8, and the other end of the second spiral blade 9 is rotatably connected to the inside of the main box body 2. The continuous rotation of the first spiral blade 8 and the second spiral blade 9 enables the molten material entering the main pipeline 18 to maintain sufficient pressure and be extruded from the first discharge port 16.

[0023] Preferably, a filter for separating particulate matter from liquid is arranged at the end of the water outlet 19, and the drain outlet of the filter is communicated with the water inlet 3. The liquid for cooling the particulate matter can be recycled to reduce consumption.

[0024] Preferably, a second cavity 4 and a second discharge port 5 are arranged on the side wall of the main box body 2, and the second cavity 4 is communicated with the main pipeline 18. The number of discharge ports is increased by using the side of the main box body 2.

[0025] Preferably, an annular limiting groove 21 is provided on the outer side of the main pipe 18, and a sliding connection key cooperating with the annular limiting groove 21 is fixedly arranged on the tool rest 14. The cooperation between the sliding connection key and the annular limiting groove 21 enables the tool rest 14 to always be in contact with the vertical plane of the discharged material, thus ensuring the normal operation of pelletizing.

[0026] Preferably, heating wires are arranged inside the first cavity 15 and the second cavity 4 to prevent the material from cooling down and blocking the first discharge port 16 and the second discharge port 5.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An underwater pelletizing device, characterized in that: It includes a feeding pipe (1), a main pipe (18), a main box body (2), several partition plates (20), several rotary cutters (6), a motor (10) and a magnetic coupling component. Inside the main box body (2), several parallel partition plates (20) are vertically arranged. There is a gap between adjacent partition plates (20). The partition plates (20) and the main box body (2) form a sandwich layer (17) with an opening downward. A first cavity (15) is arranged inside the partition plates (20). Several first discharge ports (16) communicating with the first cavity (15) are arranged side by side on the side of the partition plates (20). The main pipe (18) is horizontally arranged inside the main box body (2) and sequentially passes through the centers of the partition plates (20). The main pipe (18) is communicated with the first cavity (15). The rotary cutter (6) is rotationally connected with the main pipe (18). The rotating surface of the rotary cutter (6) fits the plane where the first discharge port (16) is located. The magnetic coupling component is fixedly connected with the rotary cutter (6) and is used to drive several rotary cutters (6) to rotate synchronously. The motor (10) is fixedly arranged outside the main box body (2) and is used to drive the magnetic coupling component to rotate. An inlet (3) is arranged at the top of the sandwich layer (17). An outlet (19) is arranged at the bottom of the main box body (2). The feeding pipe (1) is fixedly arranged outside the main box body (2). One end of the feeding pipe (1) is communicated with the main pipe (18).

2. An underwater pelletizing device according to claim 1, characterized in that: The rotary cutter (6) includes a tool holder (14) and several blades (12). The tool holder (14) is a radial structure. The center of the tool holder (14) is rotationally connected with the main pipe (18). The blades (12) are fixedly arranged on the tool holder (14). The side edges of the blades (12) are in contact with the partition plates (20).

3. An underwater pelletizing device according to claim 2, characterized in that: The magnetic coupling component includes a connecting pipe (7) and several permanent magnets. The connecting pipe (7) is sleeved outside the main pipe (18). The two ends of the connecting pipe (7) are respectively fixedly connected with the tool holders (14) at the left and right ends of the same sandwich layer (17). The permanent magnets are fixedly arranged on the tool holders (14). The magnetic poles of the permanent magnets are alternately arranged in sequence along the circumferential direction of the tool holder (14). A rotating disk (11) is fixedly arranged on the output shaft of the motor (10). A permanent magnet matching with the tool holder (14) is arranged around the rotating disk (11).

4. An underwater pelletizing device according to claim 1, characterized in that: A first spiral blade (8) is arranged inside the feeding pipe (1). The main pipe (18) is a stepped tapered pipe. The larger diameter end of the main pipe (18) is connected with the feeding pipe (1). A second spiral blade (9) is arranged inside the main pipe (18). The diameter of the second spiral blade (9) is adapted to the inner diameter of the main pipe (18). The second spiral blade (9) is coaxially and fixedly connected with the first spiral blade (8). The other end of the second spiral blade (9) is rotationally connected with the inside of the main box body (2).

5. The underwater pelletizing device according to claim 1, characterized in that: A filter for separating particulate matter from liquid is provided at the end of the water outlet (19), and the drain outlet of the filter is communicated with the water inlet (3).

6. An underwater pelletizing device according to claim 1, characterized in that: A second cavity (4) and a second discharge port (5) are provided on the side wall of the main box body (2), and the second cavity (4) is communicated with the main pipeline (18).

7. The underwater pelletizing device according to claim 3, characterized in that: An annular limiting groove (21) is provided on the outside of the main pipeline (18), and a sliding connection key cooperating with the annular limiting groove (21) is fixedly provided on the tool rest (14).

8. The underwater pelletizing device according to claim 6, wherein: Heating wires are provided inside the first cavity (15) and the second cavity (4).

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