Screw rod extruder for producing flame-retardant master batch

Abstract

The invention discloses a screw rod extruder for producing flame-retardant master batches, and belongs to the technical field of extruders, the screw rod extruder comprises a screw rod extruder main body, the upper part of the screw rod extruder main body is fixedly connected with a square pipe, the upper part of the square pipe is fixedly connected with a blanking pipe, the upper side of the blanking pipe is provided with a conical barrel hopper, and the bottom of the conical barrel hopper is provided with a blanking port; a sealing cover is fixedly connected to the upper portion of the conical barrel hopper, a feeding port is formed in the sealing cover, a conical valve assembly is movably connected into the discharging port in a sealed mode, an electric push rod is fixedly connected to the center of the upper portion of the sealing cover, and the output end of the electric push rod movably penetrates through the sealing cover and is connected with the conical valve assembly. When the conical valve assembly ascends to open the discharging port and discharges powder, after the conical valve assembly moves by a certain distance and stops moving, the upper portion of the conical valve assembly can continue to ascend, the powder can be fully discharged, and the phenomenon that the discharging port is blocked or bridged due to the fact that the powder is compacted is avoided.

Description

Technical Field

[0001] This invention relates to the field of extruder technology, specifically to a screw extruder for producing flame-retardant masterbatch. Background Technology

[0002] A screw extruder for producing flame-retardant masterbatch includes an extruder body and a conical hopper connected to the top. Powdered raw materials such as plastics, flame retardants, and additives are mixed in the conical hopper and then fed into the extruder body. The extruder body includes a screw extrusion cylinder containing a screw. One end of the screw is connected to a motor. The inner wall of the screw extrusion cylinder has a heating function. When the powdered raw materials enter the screw extrusion cylinder, they are conveyed by the screw. During conveying, the powder is heated and melted into a liquid state and extruded from the end of the screw extrusion cylinder. The extruded liquid plastic enters a molding mechanism to cool and solidify, and then is cut into granules to become flame-retardant masterbatch. To facilitate control of the powder falling into the conical hopper, a [missing information - likely a device or mechanism] is installed on the conical hopper. The existing technology involves a conical valve and an electric actuator that controls its closure. However, when the conical valve is open to discharge material, the powder in the conical hopper becomes compacted. This compaction leads to poor material flow and can even cause bridging on the inner wall of the hopper. To address this issue, existing technology installs several L-shaped top plates on the upper part of the conical valve. The upward opening of the conical valve causes the L-shaped top plates to move upward, dispersing the compacted powder. However, the upward stroke of the conical valve is very short (an excessive stroke would result in a large powder flow rate, exceeding the operating load of the screw extruder). The upward movement of the L-shaped top plates is also very short. Therefore, the L-shaped top plates have minimal effect on dispersing the powder and still easily cause material blockage and bridging in the conical hopper. Summary of the Invention

[0003] To address the technical problems mentioned in the background section, this invention provides a screw extruder for producing flame-retardant masterbatch, employing the following technical solution:

[0004] The device includes a screw extruder body, a square tube fixedly connected to the upper part of the screw extruder body, a feed pipe fixedly connected to the upper part of the square tube, a conical hopper on the upper side of the feed pipe, a feed port at the bottom of the conical hopper, the feed port being fixedly connected to the feed pipe, a sealing cover fixedly connected to the upper part of the conical hopper, a feeding port on the sealing cover, a conical valve assembly movably sealed and connected inside the feeding port, an electric actuator fixedly connected to the center of the upper part of the sealing cover, the output end of the electric actuator movably passing through the sealing cover and connected to the conical valve assembly, and a set of limiting plates fixedly connected to the inner wall of the conical hopper.

[0005] Furthermore, the conical valve assembly includes a conical valve with a movable seal inside the feed port. A tube with sealing mechanisms at both ends is fixedly connected inside the conical valve. A limit block is movably installed inside the tube, and a lifting rod is fixedly connected to the limit block. The lifting rod movably passes through and extends to the upper outer side of the tube. The lifting rod is fixedly connected to the output end of the electric actuator. A spring is installed inside the tube and is sleeved on the lifting rod. One end of the spring is fixedly connected to the limit block, and the other end is fixedly connected to the inner wall of the upper part of the tube. Several L-shaped top plates are evenly fixedly connected to the lifting rod along the circumferential direction.

[0006] Furthermore, the limit plate is located on the upper side of the cone valve.

[0007] Furthermore, the inner angle of the L-shaped top plate is 135°.

[0008] Furthermore, the inner corners of the L-shaped top plate are set downwards.

[0009] The present invention has the following advantages: When the electric actuator drives the conical valve assembly to rise and open the conical valve assembly, the electric actuator first drives the entire conical valve assembly to rise. While the conical valve assembly opens the discharge port, its upper part disperses the powder. When the upper part of the conical valve assembly contacts the limiting plate, it is blocked by the limiting plate and cannot rise. However, the upper part of the conical valve assembly is driven by the electric actuator to continue to rise a certain distance, so as to fully disperse the powder. When the conical valve assembly rises to open the discharge port and lowers to disperse the powder, after moving a certain distance and stopping, its upper part can continue to rise, so that its upper part can fully disperse the powder and avoid the powder from being compacted and causing blockage or bridging of the discharge port. Attached Figure Description

[0010] Figure 1 This is a structural diagram of the present invention;

[0011] Figure 2 This is a partial internal structure diagram of the present invention before material loading;

[0012] Figure 3 This is a partial internal structure diagram during the material cutting process of this invention;

[0013] Figure 4 This is a structural diagram of the cone valve assembly of the present invention;

[0014] Figure 5 This is a cross-sectional view of the cone valve assembly of the present invention.

[0015] Attached Figures: 1. Main body of screw extruder; 2. Square tube; 3. Feed pipe; 4. Conical hopper; 5. Feed port; 6. Sealing cover; 7. Feeding port; 8. Electric actuator; 9. Limiting plate; 10. Conical valve; 11. Tube; 12. Limiting block; 13. Lifting rod; 14. Spring; 15. L-shaped top plate. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please refer to Figure 1-5 This invention provides a screw extruder for producing flame-retardant masterbatch, comprising a screw extruder body 1, which includes a screw extrusion cylinder. The inner wall of the screw extrusion cylinder is equipped with a heating function. A screw is disposed inside the screw extrusion cylinder, and a motor is connected to one end of the screw. The motor drives the screw to rotate, causing the screw to push and extrude the molten powder. This is prior art and will not be described further here. A square tube 2 is fixedly connected to the upper part of the screw extruder body 1. The upper part of the screw extruder is connected to the square tube 2, and the upper part of the square tube 2 is fixedly connected to the feed pipe 3. The upper side of the feed pipe 3 is provided with a conical hopper 4, and the bottom of the conical hopper 4 is provided with a feed port 5. The feed port 5 is fixedly connected to the feed pipe 3. The upper part of the conical hopper 4 is fixedly connected to a sealing cover 6, and the sealing cover 6 is provided with a feeding port 7. The powder is fed into the conical hopper 4 through the feeding port 7. The powder in the conical hopper 4 enters the feed pipe 3 through the feed port 5. The powder in the feed pipe 3 enters the screw extruder through the square tube 2.

[0018] A conical valve assembly is movably and sealed inside the discharge port 5. An electric push rod 8 is fixedly connected to the center of the upper part of the sealing cover 6. The output end of the electric push rod 8 movably passes through the sealing cover 6 and is connected to the conical valve assembly. A set of limiting plates 9 are fixedly connected to the inner wall of the conical hopper 4. The electric push rod 8 drives the conical valve assembly to rise and fall. When the electric push rod 8 drives the conical valve assembly to rise, a gap is formed between the conical valve assembly and the discharge port 5. The powder in the conical hopper 4 enters the discharge pipe 3 through the gap. When the upper part of the conical valve assembly is blocked by the limiting plate 9, it cannot continue to rise, but its upper part is pulled by the electric push rod 8 to continue to rise.

[0019] The conical valve assembly includes a conical valve 10 with a movable seal disposed inside the discharge port 5. The conical valve 10 is used to open or close the discharge port 5. A tube 11 with sealing mechanisms at both ends is fixedly connected inside the conical valve 10 to prevent powder from entering the tube 11. A limit block 12 is movably disposed inside the tube 11, and a lifting rod 13 is fixedly connected to the limit block 12. The lifting rod 13 movably passes through and extends to the upper outer side of the tube 11, forming a movable seal between the lifting rod 13 and the tube 11. The lifting rod 13 is fixedly connected to the output end of an electric actuator 8, which drives the lifting rod 13 to rise and fall. A spring 14 is disposed inside the tube 11 and is sleeved on the lifting rod 13. One end of the spring 14 is fixedly connected to the limit block 12, and the other end is fixedly connected to the inner wall of the upper part of the tube 11. The lifting rod 13 is circumferentially... Several L-shaped top plates 15 are fixedly connected. When the lifting rod 13 rises, it drives the limiting block 12 to rise. The limiting block 12 drives the spring 14, the spring 14 drives the tube 11, and the tube 11 drives the cone valve 10 to rise. During this process, when the limiting block 12 drives the spring 14 to rise, the limiting block 12 cannot overcome the elastic force of the spring 14, and the spring 14 will not be compressed until the upper part of the cone valve 10 is blocked by the limiting plate 9 and cannot rise. Meanwhile, the electric push rod 8 continues to pull the lifting rod 13. At this time, the limiting block 12 overcomes the elastic force of the spring 14 and continues to rise. The spring 14 is compressed. During the continuous rise of the lifting rod 13, it drives several L-shaped top plates 15 to rise. When the L-shaped top plates 15 rise, they push open the compacted powder in the cone hopper 4, causing the powder to disperse. It is worth noting that in order to disperse the powder more fully, the number of L-shaped top plates 15 can be increased adaptively.

[0020] The limiting plate 9 is located on the upper side of the cone valve 10. When the cone valve 10 rises, its upper part is blocked by the bottom of the limiting plate 9. The inner angle of the L-shaped top plate 15 is 135°, which can better push open the dispersed powder. The inner angle of the L-shaped top plate 15 is set downward, which is also for better pushing open the dispersed powder.

[0021] Working principle of this invention: When no material is being fed, please refer to... Figure 2 A seal is formed between the cone valve 10 and the discharge port 5, and the powder is fed into the cone hopper 4 through the feeding port 7.

[0022] When cutting materials, please refer to the following: Figure 3The electric actuator 8 is activated, which drives the lifting rod 13 to rise. The lifting rod 13 drives the limiting block 12 to rise, which in turn drives the spring 14. The spring 14 drives the tube 11, which in turn drives the conical valve 10 to rise. The conical valve 10 disengages from the feed port 5, forming a gap between it and the feed port 5. During this process, the limiting block 12 cannot overcome the elastic force of the spring 14, and the spring 14 is not compressed. The powder in the conical hopper 4 falls into the feed pipe 3 through the gap. The powder in the feed pipe 3 enters the screw extruder body 1 through the square tube 2. At the same time, during the rise of the conical valve 10, the lifting rod 13 also drives the L-shaped top plate 15. The material rises to initially disperse the powder in the cone hopper 4. When the upper part of the cone valve 10 is blocked by the bottom of the limiting plate 9 and cannot rise, the electric push rod 8 drives the lifting rod 13 to continue rising. At this time, the limiting block 12 continues to rise and overcomes the elastic force of the spring 14, causing the spring 14 to compress. The lifting rod 13 also drives the L-shaped top plate 15 to continue rising, continuing to fully disperse the powder. When a certain height is reached, the electric push rod 8 closes and the lifting rod 13 stops rising until all the powder in the cone hopper 4 is discharged. Then the electric push rod 8 starts again, driving the cone valve 10 to descend and re-seal the discharge port 5.

[0023] This invention is simple to operate, convenient to use, and suitable for widespread promotion and application. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A screw extruder for producing flame-retardant masterbatch, comprising a screw extruder body (1), a square tube (2) fixedly connected to the upper part of the screw extruder body (1), a feed pipe (3) fixedly connected to the upper part of the square tube (2), a conical hopper (4) provided on the upper side of the feed pipe (3), a feed port (5) provided at the bottom of the conical hopper (4), the feed port (5) being fixedly connected to the feed pipe (3), and a sealing cover (6) fixedly connected to the upper part of the conical hopper (4), with a feeding port (7) opened on the sealing cover (6), characterized in that: A conical valve assembly is connected to the feed inlet (5) in a movable sealing connection. An electric push rod (8) is fixedly connected to the upper center of the sealing cover (6). The output end of the electric push rod (8) moves through the sealing cover (6) and is connected to the conical valve assembly. A set of limit plates (9) is fixedly connected to the inner wall of the conical hopper (4).

2. The screw extruder for producing flame-retardant masterbatch according to claim 1, characterized in that: The conical valve assembly includes a conical valve (10) with a movable seal inside the feed port (5). A tube (11) with sealing mechanisms at both ends is fixedly connected inside the conical valve (10). A limit block (12) is movably installed inside the tube (11). A lifting rod (13) is fixedly connected to the limit block (12). The lifting rod (13) movably passes through and extends to the upper outer side of the tube (11). The lifting rod (13) is fixedly connected to the output end of the electric push rod (8). A spring (14) is installed inside the tube (11). The spring (14) is sleeved on the lifting rod (13). One end of the spring (14) is fixedly connected to the limit block (12), and the other end is fixedly connected to the inner wall of the upper part of the tube (11). Several L-shaped top plates (15) are evenly fixedly connected to the lifting rod (13) along the circumferential direction.

3. The screw extruder for producing flame-retardant masterbatch according to claim 2, characterized in that: The limiting plate (9) is located on the upper side of the cone valve (10).

4. A screw extruder for producing flame-retardant masterbatch according to claim 2, characterized in that: The interior angle of the L-shaped top plate (15) is 135°.

5. A screw extruder for producing flame-retardant masterbatch according to claim 2, characterized in that: The inner corner of the L-shaped top plate (15) is set downwards.

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