A kind of red phosphorus flame retardant twin-screw extruder observation seat sealing structure

Abstract

This utility model discloses a sealing structure for the observation seat of a twin-screw extruder for red phosphorus flame retardant, belonging to the technical field of twin-screw extruder components. It includes a twin-screw extruder for red phosphorus flame retardant, with a circular cylinder connected to its front end. A drive motor is connected to the outer end of the circular cylinder, and feed pipes are connected to both sides of the cylinder. An openable and closable arc-shaped top cover is rotatably connected to the surface of the circular cylinder via a rotating shaft. An observation seat is fixedly connected to the surface of the arc-shaped top cover, and a transparent observation window is connected above the observation seat. This sealing structure for the observation seat can, on the one hand, further seal the area around the junction of the transparent observation window and the observation seat, reducing heat loss from the cylinder and preventing burns; on the other hand, it can limit the opening of the arc-shaped top cover, preventing the risk of it falling and improving the safety of personnel observing the operating conditions of the twin-screw extruder for red phosphorus flame retardant.

Description

Technical Field

[0001] This utility model relates to the technical field of twin-screw extruder components, and more specifically, to a sealing structure for the observation seat of a red phosphorus flame retardant twin-screw extruder. Background Technology

[0002] Twin-screw extruders are one of the commonly used pieces of equipment in the production process of red phosphorus flame retardants. A twin-screw extruder mainly consists of a transmission device, a feeding device, a barrel, and two parallel screws. Its working principle is to use the principle of frictional heat to heat and melt solid plastic, and then push the molten plastic towards the die for extrusion through the rotation of the screws.

[0003] Currently, an observation seat is installed on the side of the cylindrical body at the top of the feed position of the twin-screw extruder to observe the working status of the screw inside the body. The operator can monitor the kneading of the screw and the material at any time through the transparent observation window on the upper surface of the observation seat, and can also observe the flow state of the molten plastic at the same time. Secondly, in order to facilitate the cleaning of material blockage in the body, the observation seat is located on the outer side of the arc-shaped top cover that can be opened and closed by a buckle. In case of material blockage or impurities in the extruded strip, the inside of the body can be cleaned by opening the arc-shaped top cover.

[0004] The existing observation seat structure has the following problems: First, the sealing effect around the junction area between the transparent observation window and the observation seat is not good enough. Due to the high temperature inside the cylinder, when the staff is close to the transparent observation window, the heat will spread outward from the junction area, which can easily cause burns. Second, when the arc-shaped top cover is opened to clean the inside of the cylinder, the existing arc-shaped top cover does not have a corresponding limiting structure. During the cleaning process, the arc-shaped top cover may fall, causing the staff to be trapped inside the cylinder. Utility Model Content

[0005] The purpose of this invention is to provide a sealing structure for the observation seat of a twin-screw extruder for red phosphorus flame retardants. This sealing structure can, on the one hand, further seal the area around the junction of the transparent observation window and the observation seat, reducing heat loss from the inside of the cylinder and preventing burns. On the other hand, it can limit the opening of the arc-shaped top cover, preventing the risk of the arc-shaped top cover falling and improving the safety of workers observing the operating conditions of the twin-screw extruder for red phosphorus flame retardants.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A sealing structure for an observation seat of a twin-screw extruder for red phosphorus flame retardant includes a twin-screw extruder for red phosphorus flame retardant. A circular cylinder is connected to the front end of the extruder. A drive motor is connected to the outer end of the circular cylinder, and feed pipes are connected to both sides of the circular cylinder. An openable and closable arc-shaped top cover is rotatably connected to the surface of the circular cylinder via a rotating shaft. An observation seat is fixedly connected to the surface of the arc-shaped top cover, and a transparent observation window is connected above the observation seat. The arc-shaped top cover is secured by a snap-fit ​​below. Three connecting cylinders arranged in an equilateral triangle are welded and fixed to the upper surface of the arc-shaped top cover around the observation seat. Each connecting cylinder has an internal thread machined into its hollow area. A sealing ring is fitted around the area where the observation seat and the transparent observation window intersect. The sealing ring includes a lower support portion and an upper sealing portion, wherein the lower support portion protrudes inward and the protruding area is embedded in the area where the observation seat and the transparent observation window intersect.

[0008] As a further optimization of this solution, the sealing ring is embedded in the mounting ring below, and three connecting rods are connected in an equilateral triangle around the mounting ring. The outer ends of the connecting rods are fixed with inserts, and the inserts are inserted into the hollow area of ​​the connecting tube and fixed by screws.

[0009] As a further optimization of this solution, two parallel supports are provided on both sides of the circular cylindrical surface above the arc-shaped top cover. The length of the support closer to the arc-shaped top cover is shorter than the length of the support farther away from the arc-shaped top cover. Arc-shaped ribs are fixedly connected above the two parallel supports. The arc of the arc-shaped ribs is the same as the arc of the arc-shaped top cover. Several horizontal mounting rods are connected between the arc-shaped ribs. Magnetic rings are fitted on the bodies of the mounting rods.

[0010] As a further optimization of this solution, the arc-shaped top cover is opened upwards and then its back is attached to the magnetic ring.

[0011] As a further optimization of this solution, the aforementioned several transverse mounting rods are distributed in a stepped manner from top to bottom along the arc direction of the arc-shaped ribs.

[0012] Compared with existing technologies, the beneficial effects of this utility model are as follows:

[0013] In this utility model, by designing a sealing ring structure around the junction area between the transparent observation window and the observation seat, a further sealing operation can be performed around the junction area between the transparent observation window and the observation seat, reducing heat leakage from the inside of the cylinder and avoiding burn accidents. Through the connecting cylinder, mounting ring and connecting rod structure, the above-mentioned sealing ring structure can be installed on the circular cylinder at the front end of the existing red phosphorus flame retardant twin-screw extruder, which is convenient to install and does not require a complete redesign of the circular cylinder structure.

[0014] This invention incorporates a support structure, arc-shaped ribs, mounting rods, and magnetic rings on the surface of the existing circular cylinder. When the arc-shaped top cover is opened for cleaning the inside of the cylinder, it is temporarily fixed by the magnetic rings, thus avoiding the risk of the arc-shaped top cover falling and improving the safety of workers observing the working conditions of the twin-screw extruder for red phosphorus flame retardant. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the installation structure of the connecting cylinder and the bracket of this utility model;

[0016] Figure 2 This is a schematic diagram of the sealing ring connection structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the disassembled sealing ring structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the arc-shaped rib connection structure of this utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the arc-shaped top cover of this utility model when it is opened;

[0020] In the diagram: 1. Twin-screw extruder for red phosphorus flame retardant; 2. Circular cylinder; 3. Drive motor; 4. Arc-shaped top cover; 5. Transparent observation window; 6. Buckle; 7. Sealing ring; 8. Connecting rod; 9. Insert tube; 10. Screw; 11. Connecting tube; 12. Bracket; 13. Arc-shaped rib; 14. Mounting rod; 15. Magnetic ring; 71. Sealing part; 72. Support part. Detailed Implementation

[0021] 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.

[0022] In order to address the problem that the existing transparent observation window 5 and the area where they meet the observation seat are not well sealed, and that the high temperature inside the cylinder causes heat to spread outward from the area when staff are close to the transparent observation window 5, which could easily lead to burns;

[0023] like Figure 1 As shown, this application includes a twin-screw extruder 1 for red phosphorus flame retardant. The front end of the twin-screw extruder 1 is connected to a cylindrical body 2. The outer end of the cylindrical body 2 is connected to a drive motor 3, and the two sides of the cylindrical body 2 are connected to feed pipes. The surface of the cylindrical body 2 is rotatably connected to an openable and closable arc-shaped top cover 4 via a rotating shaft. An observation seat is fixedly connected to the surface of the arc-shaped top cover 4, and a transparent observation window 5 is connected above the observation seat. The arc-shaped top cover 4 is fastened and fixed by a buckle 6 below.

[0024] like Figure 2 As shown, three connecting cylinders 11 arranged in an equilateral triangle are welded and fixed to the upper surface of the arc-shaped top cover 4 around the observation seat. Each connecting cylinder 11 has internal threads processed in its hollow area. A sealing ring 7 is fitted around the area where the observation seat and the transparent observation window 5 meet.

[0025] like Figure 3 As shown, the sealing ring 7 includes a lower support portion 72 and an upper sealing portion 71, wherein the lower support portion 72 protrudes inward and the protruding area is embedded in the junction area between the observation seat and the transparent observation window 5.

[0026] The sealing ring 7 is embedded in the mounting ring below. Three connecting rods 8 are connected in an equilateral triangle around the mounting ring. The outer end of the connecting rod 8 is fixed with a tube 9. The tube 9 is inserted into the hollow area of ​​the connecting tube 11 and is fixed by screws 10.

[0027] Specifically, three connecting cylinders 11 are welded directly onto the upper surface of the existing arc-shaped top cover 4. All connecting rods 8 are fixed with screws 10, and then the mounting ring is fixed. The diameter of the mounting ring is larger than the diameter of the transparent observation window 5. The sealing ring 7 is inserted from above the transparent observation window 5 downwards. During the process, the lower support part 72 is first squeezed and deformed outwards through the perimeter of the transparent observation window 5, and then protrudes inwards. The protruding area is embedded in the junction area between the observation seat and the transparent observation window 5. Combined with the upper sealing part 71, further sealing and heat insulation of the junction area is achieved, reducing the leakage of heat from the inside of the cylinder when the staff approaches the transparent observation window 5.

[0028] In order to address the problem that the existing curved top cover 4 does not have a corresponding limiting structure when cleaning the inside of the cylinder, and that the curved top cover 4 may fall during the cleaning process, causing dangerous accidents where workers' bodies are trapped inside the cylinder;

[0029] like Figure 4 As shown, two parallel supports 12 are provided on both sides of the surface of the circular cylinder 2 above the arc-shaped top cover 4. The length of the support 12 closer to the arc-shaped top cover 4 is shorter than the length of the support 12 farther away from the arc-shaped top cover 4. Arc-shaped ribs 13 are fixedly connected above the two parallel supports 12. The arc of the arc-shaped ribs 13 is the same as the arc of the arc-shaped top cover 4. Several horizontal mounting rods 14 are connected between the arc-shaped ribs 13. Magnetic rings 15 are fitted on the body of each mounting rod 14. Several horizontal mounting rods 14 are distributed in a stepped manner from top to bottom along the arc direction of the arc-shaped ribs 13.

[0030] like Figure 5 As shown, after the arc-shaped top cover 4 is opened upwards, its back surface is attached to the magnetic ring 15.

[0031] Specifically, by welding a bracket 12 to the surface of the cylindrical body 2, the arc-shaped ribs 13 are connected. When the staff opens the arc-shaped top cover 4 to clean the inside of the cylindrical body 2, the arc-shaped top cover 4 is attracted by the magnetic ring 15, which temporarily fixes it and avoids the risk of the arc-shaped top cover 4 falling. This improves the safety of the staff in observing the working condition of the twin-screw extruder for red phosphorus flame retardant. After the cleaning work is completed, the arc-shaped top cover 4 is pulled down forcefully to release the magnetic ring 15 and reset it.

[0032] 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.

[0033] 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 sealing structure for an observation seat of a twin-screw extruder for red phosphorus flame retardant, comprising a twin-screw extruder for red phosphorus flame retardant, wherein a circular cylinder is connected to the front end of the twin-screw extruder, a drive motor is connected to the outer end of the circular cylinder, and feed pipes are connected to both sides of the circular cylinder; an openable and closable arc-shaped top cover is rotatably connected to the surface of the circular cylinder via a rotating shaft; an observation seat is fixedly connected to the surface of the arc-shaped top cover, and a transparent observation window is connected above the observation seat; the arc-shaped top cover is fastened and fixed by a buckle below, characterized in that: The upper surface of the arc-shaped top cover around the observation seat is welded with three connecting cylinders arranged in an equilateral triangle. Each connecting cylinder has an internal thread in its hollow area. A sealing ring is fitted around the area where the observation seat meets the transparent observation window. The sealing ring includes a lower support part and an upper sealing part. The lower support part protrudes inward and the protruding area is embedded in the area where the observation seat meets the transparent observation window.

2. The sealing structure for the observation seat of a twin-screw extruder for red phosphorus flame retardant according to claim 1, characterized in that: The sealing ring is embedded in the mounting ring below. Three connecting rods are connected around the mounting ring in an equilateral triangle pattern. A plug is fixed to the outer end of the connecting rod. The plug is inserted into the hollow area of ​​the connecting tube and fixed by screws.

3. The sealing structure for the observation seat of a twin-screw extruder for red phosphorus flame retardant according to claim 2, characterized in that: The circular cylindrical surface above the arc-shaped top cover is provided with two parallel supports on both sides. The length of the support closer to the arc-shaped top cover is shorter than the length of the support farther away from the arc-shaped top cover. Arc-shaped ribs are fixedly connected above the two parallel supports. The arc of the arc-shaped ribs is the same as the arc of the arc-shaped top cover. Several horizontal mounting rods are connected between the arc-shaped ribs. Magnetic rings are fitted on the bodies of the mounting rods.

4. The sealing structure for the observation seat of a twin-screw extruder for red phosphorus flame retardant according to claim 3, characterized in that: After the arc-shaped top cover is opened upwards, its back side is attached to the magnetic ring.

5. The sealing structure for the observation seat of a twin-screw extruder for red phosphorus flame retardant according to claim 4, characterized in that: The aforementioned horizontal mounting rods are distributed in a stepped manner from top to bottom along the arc direction of the arc-shaped ribs.

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