Secondary water removal and material sticking prevention device used after cutting and granulating of red phosphorus flame retardant

Abstract

The utility model discloses a secondary water removal anti-sticking device after cutting and granulating red phosphorus flame retardant, which belongs to the technical field of red phosphorus flame retardant processing equipment and comprises a double-screw extruder, a cooling water tank is arranged in front of a discharge port of the double-screw extruder, a granulator is arranged in front of the cooling water tank, and a water outlet of the granulator is communicated with the cooling water tank. A discharging pipeline is arranged below the granulator, a conveying belt is arranged below the discharging pipeline, an extension plate is arranged on the side face of a rack of the granulator, an electric heating fan is installed on the extension plate, and an air outlet hole of the electric heating fan is communicated with a ventilation cover cylinder and a ventilation pipeline in the rack through a flow dividing pipeline. According to the secondary water removal anti-sticking device, on one hand, primary water removal operation is performed on red phosphorus flame retardant particles in the discharging pipeline by prolonging the length of the discharging pipeline of the granulator, and on the other hand, secondary water removal is performed on the red phosphorus flame retardant particles in combination with the material homogenizing cover below the discharging pipeline, so that the water removal effect is relatively good; and the material sticking problem in the subsequent particle transportation process can be prevented.

Description

Technical Field

[0001] This utility model relates to the technical field of red phosphorus flame retardant processing equipment, and more specifically, to a secondary dehydration and anti-sticking device for red phosphorus flame retardant after it has been granulated. Background Technology

[0002] Due to its high flame retardant efficiency, low cost, and halogen-free nature, red phosphorus has seen some application in the domestic market in recent years. It can be widely used in flame retardant applications for various resins, unsaturated resins, hot melt adhesives, rubber, coatings, and other products. Halogen-free, low-smoke, and low-toxicity environmentally friendly flame retardants have always been a sought-after goal. In recent years, some global flame retardant suppliers and users have shown great enthusiasm for halogen-free flame retardants and have invested heavily in the development of halogen-free flame retardants and flame retardant materials. Analysis shows that the main types of halogen-free flame retardants are phosphorus-based flame retardants and inorganic hydrates, with red phosphorus flame retardants being a major component.

[0003] In the processing of red phosphorus flame retardants, commonly used equipment includes twin-screw extruders. The strip material extruded by the twin-screw extruder generally needs to go through a pelletizing process. During the process of conveying the strip material to the pelletizer, the strip material needs to be cooled by a cooling water tank before being pelletized. Since the strip material needs to be cooled by contact with cooling water, it will inevitably become wet. In order to avoid excessive cooling water adhering to the surface of the flame retardant strip material during the pelletizing stage and causing sticking, a dehydration process is usually carried out between the extrusion stage and the pelletizing stage. This prevents the flame retardant granules from clumping together due to the adhesion of cooling water during the pelletizing stage. However, in actual processing, the dehydration effect of the first dehydration process is not thorough, and a small amount of cooling water still adheres to the flame retardant granules. Therefore, a second dehydration process is required for the granules after the flame retardant has been granulated. Utility Model Content

[0004] The purpose of this invention is to provide a secondary dehydration and anti-sticking device for red phosphorus flame retardant after granulation. This device extends the length of the pelletizer's discharge pipe to perform a primary dehydration operation on the red phosphorus flame retardant granules inside the discharge pipe. Simultaneously, it combines this with a material distribution hood below the discharge pipe to perform a secondary dehydration operation on the red phosphorus flame retardant granules. The dehydration effect is good, which can prevent the sticking problem during subsequent granule transportation.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A secondary dehydration and anti-sticking device for red phosphorus flame retardant after granulation includes a twin-screw extruder. A cooling water tank is provided in front of the discharge port of the twin-screw extruder. A pelletizer is provided in front of the cooling water tank. A discharge pipe is provided below the pelletizer. A conveyor belt is provided below the discharge pipe. An extension plate is provided on the side of the pelletizer frame. An electric hot air fan is installed on the extension plate. The air outlet of the electric hot air fan is connected to a ventilation hood and a ventilation duct inside the frame through a diversion pipe. An extension pipe section is integrally formed below the discharge pipe. A through groove is opened on both the left and right sides of the extension pipe section. One through groove of the extension pipe section is connected to the ventilation hood, and an air outlet grille is embedded in the through groove of the other through groove of the extension pipe section.

[0007] As a further optimization of this solution, a feed inlet is provided on the upper end of the inner side of the pelletizer.

[0008] As a further optimization of this solution, the extended pipe section is provided with several inclined discharge baffles spaced equidistantly at the top and bottom. The surfaces of the inclined discharge baffles are all machined with equally spaced air leakage grooves. The lower ends of the inclined discharge baffles are spaced two to three centimeters apart from the inner wall of the extended pipe section.

[0009] As a further optimization of this solution, the outer section of the ventilation duct is L-shaped and connects upward to the sealing base plate. A conical material distribution cover is embedded and installed above the sealing base plate. The cone-shaped area of ​​the material distribution cover faces directly below the outlet of the extended duct section. Several air outlet holes are machined at equal intervals on the surface of the material distribution cover.

[0010] As a further optimization of this solution, the electric heating fan is connected to an external power supply, and the front and rear sides of the several inclined feeding baffles are welded and fixed to the front and rear sides of the extended pipe section.

[0011] Compared with existing technologies, the beneficial effects of this utility model are as follows:

[0012] This invention extends the length of the pelletizer's discharge pipe by designing an extended pipe section. Combined with an internally designed structure of several equidistant, inclined discharge baffles, the red phosphorus flame retardant granules can move for a longer time within the discharge pipe and the extended pipe section. During this movement, hot air is introduced into the ventilation hood via an electric hot air blower. The hot air passes through the air leakage channel to dry the falling red phosphorus flame retardant granules. Simultaneously, a material equalization hood structure is designed so that the red phosphorus flame retardant granules falling from the extended pipe section are evenly separated from the top of the conical material equalization hood to the surrounding inclined surfaces. During this movement, hot air is introduced into the ventilation pipe via an electric hot air blower. The hot air passes through several air outlets and blows upwards to dry the separated red phosphorus flame retardant granules, achieving secondary drying and dehydration. The dehydration effect is good and can prevent material sticking during subsequent granule transportation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the installation structure of the secondary water removal and anti-sticking material device of this utility model (with part of the extended pipe section shell removed);

[0014] Figure 2 This is a schematic diagram of the internal structure of the pelletizer of this utility model (with part of the extended pipe section removed from the outer shell);

[0015] Figure 3 This is a schematic diagram of the internal structure of the extended pipeline section of this utility model (with part of the outer shell of the extended pipeline section removed);

[0016] In the diagram: 1. Twin-screw extruder; 2. Cooling water tank; 3. Pelletizer; 4. Discharge pipe; 5. Conveyor belt; 6. Extension plate; 7. Electric hot air blower; 8. Diversion pipe; 9. Ventilation hood; 10. Ventilation duct; 11. Extension pipe section; 12. Feed inlet; 13. Discharge baffle; 14. Air leakage channel; 15. Air outlet grille; 16. Sealing base plate; 17. Material distribution hood; 18. Air outlet. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0018] To address the issue that existing strip-shaped materials inevitably become wet due to contact with cooling water for cooling, and to prevent excessive cooling water from adhering to the surface of the flame retardant strips during the pelletizing stage, a dehydration process is usually performed between the extrusion and pelletizing stages. This prevents the flame retardant granules from clumping together due to the adhesion of cooling water during the pelletizing stage. However, in actual processing, the dehydration effect of this single dehydration process is not thorough, and a small amount of cooling water still adheres to the flame retardant granules.

[0019] like Figure 1 As shown, this application includes a twin-screw extruder 1, a cooling water tank 2 is provided in front of the discharge port of the twin-screw extruder 1, a pelletizer 3 is provided in front of the cooling water tank 2, a discharge pipe 4 is provided below the pelletizer 3, a conveyor belt 5 is provided below the discharge pipe 4, an extension plate 6 is provided on the side of the frame of the pelletizer 3, and an electric hot air blower 7 is installed on the extension plate 6.

[0020] like Figure 2 As shown, the air outlet of the electric hot air blower 7 is connected to the ventilation hood 9 and ventilation duct 10 inside the frame through the diversion pipe 8. An extended pipe section 11 is integrally formed below the discharge pipe 4. The extended pipe section 11 has through slots on both the left and right sides. One through slot of the extended pipe section 11 is connected to the ventilation hood 9, and the other through slot of the extended pipe section 11 is embedded with an air outlet grille 15. The upper end of the inner side of the pelletizer 3 is provided with a feed inlet 12.

[0021] like Figure 3 As shown, the extended pipe section 11 is provided with several inclined feeding baffles 13 that are equidistantly spaced at the top and bottom. The surfaces of the inclined feeding baffles 13 are all machined with equally spaced air leakage grooves 14. The lower ends of the inclined feeding baffles 13 are spaced two to three centimeters away from the inner sidewall of the extended pipe section 11. The outer section of the ventilation pipe 10 is L-shaped and connects upward to the sealing base plate 16. A conical material distribution cover 17 is embedded and installed above the sealing base plate 16. The cone-shaped area of ​​the material distribution cover 17 faces directly below the outlet of the extended pipe section 11. The surface of the material distribution cover 17 is machined with several air outlet holes 18 that are equidistantly spaced.

[0022] Specifically, the dimensions of the air leakage channel 14, the air outlet grille 15, and the air outlet hole 18 in this application are all smaller than the size of the red phosphorus flame retardant particles after being cut by the pelletizer 3. The electric hot air blower 7 is connected to an external power supply. Several inclined feeding baffles 13 are welded and fixed to the front and rear sides of the extended pipe section 11.

[0023] During operation, the red phosphorus flame retardant strip material flows out from the outlet of the twin-screw extruder 1, enters the cooling water tank along the guide roller support, and is cooled by the pre-drying process via the guide roller. Then, the red phosphorus flame retardant strip material enters the pelletizer 3 through the feed inlet 12, where it is cut into several granules. The red phosphorus flame retardant granules pass through the discharge pipe 4 and the extension pipe section 11. During this process, the electric hot air fan 7 blows air into the ventilation hood 9. Hot air passes through the air vent 14 to dry and remove moisture from the falling red phosphorus flame retardant granules. The granules, falling from the extended pipe section 11, separate evenly from the top of the conical equalization hood 17. During this process, hot air is introduced into the ventilation duct 10 via an electric hot air blower 7. The hot air then passes upward through several air outlets 18, drying the separated red phosphorus flame retardant granules and achieving secondary drying and dehydration. This method provides effective dehydration and prevents material sticking during subsequent granule transportation.

[0024] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0025] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A secondary dehydration and anti-sticking device for red phosphorus flame retardant after granulation, comprising a twin-screw extruder, wherein a cooling water tank is provided in front of the discharge port of the twin-screw extruder, a pelletizer is provided in front of the cooling water tank, a discharge pipe is provided below the pelletizer, and a conveyor belt is provided below the discharge pipe, characterized in that: The pelletizer frame has an extension plate on its side, and an electric hot air blower is installed on the extension plate. The air outlet of the electric hot air blower is connected to the ventilation hood and ventilation duct inside the frame through a diversion pipe. An extension pipe section is integrally formed below the discharge pipe. The extension pipe section has through slots on both the left and right sides. One through slot of the extension pipe section is connected to the ventilation hood, and an air outlet grille is embedded in the through slot of the other side of the extension pipe section.

2. The secondary dehydration and anti-sticking device for red phosphorus flame retardant after granulation according to claim 1, characterized in that: The pelletizer has a feed inlet on the upper part of its inner side.

3. The secondary dehydration and anti-sticking device for red phosphorus flame retardant after granulation according to claim 2, characterized in that: The extended pipe section is equipped with several inclined discharge baffles spaced equidistantly at the top and bottom. The surfaces of the inclined discharge baffles are all machined with equally spaced air leakage grooves. The lower ends of the inclined discharge baffles are spaced two to three centimeters apart from the inner wall of the extended pipe section.

4. The secondary dehydration and anti-sticking device for red phosphorus flame retardant after granulation according to claim 3, characterized in that: The outer section of the ventilation duct is L-shaped and connects upward to the sealing base plate. A conical material distribution cover is embedded and installed above the sealing base plate. The cone-shaped area of ​​the material distribution cover faces directly below the outlet of the extended duct section. Several air outlet holes are machined at equal intervals on the surface of the material distribution cover.

5. The secondary dehydration and anti-sticking device for red phosphorus flame retardant after granulation according to claim 4, characterized in that: The electric heating fan is connected to an external power supply, and the front and rear sides of the several inclined feeding baffles are welded and fixed to the front and rear sides of the extended pipe section.

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