A screw connection sealing and heat insulation structure for a high-temperature extruder

Abstract

The application relates to a screw connection sealing and heat insulation structure for a high-temperature extruder, which comprises a speed reducer, a connecting sleeve pipe is fixedly installed on the right side of the speed reducer, a machine cylinder is fixedly connected to the right side of the connecting sleeve pipe, a screw body is arranged in the machine cylinder, the screw body penetrates through the inside of the connecting sleeve pipe and is connected between the speed reducer, the inside of the connecting sleeve pipe is filled with packing, a filling groove is arranged in the inside of the machine cylinder on the right side of the packing, the inside of the filling groove is filled with solid or low-temperature raw materials which are the same as extrusion materials, and the filling groove is located on the periphery of the screw body. The application forms mechanical sealing through the packing, double sealing through the solid or low-temperature raw materials which are the same as the extrusion materials filled in the filling groove, and the raw materials can absorb part of heat after being filled, so that the single sealing mode or simple heat insulation measures in the prior art are replaced, material leakage is reduced, and the problem of high-temperature conduction is reduced.

Description

Technical Field

[0001] This application relates to the technical field of high-temperature extruders, and in particular to a sealing and heat-insulating structure for the screw connection of a high-temperature extruder. Background Technology

[0002] A high-temperature extruder is a specialized piece of equipment used to melt, plasticize, mix, and shape materials in a high-temperature environment. It is widely used in various industries such as plastics, rubber, ceramics, food, chemicals, and pharmaceuticals. Its core function is to continuously extrude materials into shapes by heating them at high temperatures and applying mechanical extrusion.

[0003] In the extrusion production of high-temperature plastics (such as PP), the temperature of the extruder barrel typically reaches 200-300℃. The screw rotates inside the barrel, and its tail (shank) needs to pass through the rear end of the barrel and connect to the output shaft of the gearbox. This connection area faces two major technical challenges: Under high pressure, there is a risk of reverse leakage of the molten material inside the barrel along the gap between the screw and the rear end of the barrel towards the gearbox. Traditional single-layer mechanical seals (such as packing seals) are prone to failure under high temperature and pressure, leading to material leakage, equipment contamination, and even damage to the gearbox. Furthermore, the screw itself is a good conductor of high temperature, and a large amount of heat will be continuously conducted to the gearbox through the screw tail. This will cause the gearbox temperature to become excessively high, affecting the performance of its internal lubricating oil, accelerating gear wear, and shortening the gearbox's service life. However, existing technologies typically employ a single sealing method or simple heat insulation measures, which are insufficient to simultaneously and efficiently solve both material leakage and high-temperature conduction problems. Therefore, it is necessary to propose a sealing and heat insulation structure for the screw connection of a high-temperature extruder to address these issues. Utility Model Content

[0004] To address the issue that existing high-temperature extruders typically employ a single sealing method or simple insulation measures, which are insufficient to simultaneously and efficiently resolve the problems of material leakage and high-temperature conduction, this application provides a sealing and insulation structure for the screw connection of a high-temperature extruder.

[0005] This application provides a sealing and heat insulation structure for the screw connection of a high-temperature extruder, which adopts the following technical solution: A sealing and heat-insulating structure for the screw connection of a high-temperature extruder includes a gearbox, a connecting sleeve fixedly installed on the right side of the gearbox, a barrel fixedly connected to the right side of the connecting sleeve, a screw body disposed inside the barrel, the screw body penetrating the interior of the connecting sleeve and connected to the gearbox, the interior of the connecting sleeve being filled with packing, a filling groove being provided inside the barrel on the right side of the packing, the filling groove being filled with a solid or low-temperature raw material identical to the extruded material, and the filling groove being located on the periphery of the screw body.

[0006] Through the cooperation between the packing and the filling trough, the packing is fixed inside the connecting sleeve on the periphery of the screw body, forming a mechanical seal. By filling the filling trough with the same solid or low-temperature raw material as the extruded material, these raw materials melt upon heating near the high-temperature barrel end, forming a viscous melt sealing layer. The high viscosity of this layer prevents the internal high-pressure melt from leaking outward, thus forming a double seal. This reduces material leakage, and the filling material can absorb some heat, thereby lowering the temperature in that area and reducing problems caused by high-temperature conduction.

[0007] A further improvement of the technical solution of this application is that: a cooling ring is fixedly installed on the periphery of the packing, a spiral groove is opened inside the cooling ring, a water inlet pipe is fixedly installed on the top of the connecting sleeve, a drain pipe is fixedly installed on the top of the connecting sleeve on the right side of the water inlet pipe, and the water inlet pipe and the drain pipe are interconnected with the spiral groove.

[0008] By adopting the above technical solution, the cooling ring and other cooperating structures work together. By connecting the inlet and outlet pipes to the external cooling water supply equipment, the cooling water can circulate inside the spiral groove, thereby continuously cooling the packing packing and preventing it from hardening and failing due to high temperature. At the same time, it also cools the screw body to a certain extent, further reducing the possibility of the screw body conducting high temperature to the gearbox.

[0009] A further improvement of the technical solution of this application is that: a connecting column is fixedly installed on the top of the barrel at the top of the filling trough, a feeding screw is rotatably installed inside the connecting column, a motor is fixedly installed on the top of the connecting column, the output shaft of the motor is fixedly connected to the feeding screw, and a hopper is fixedly connected to the right side of the connecting column.

[0010] The above technical solution involves the cooperation between the connecting column and its internal structure. The feeding screw is driven by a motor to rotate, which actively guides the raw materials fed from the hopper into the connecting column downwards, ensuring that they enter the filling trough normally. This reduces the possibility of blockage at the filling trough inlet, ensures normal use of the filling trough, and seals the outer surface of the screw body.

[0011] A further improvement of the technical solution of this application is that a pressure relief valve is fixedly installed on the front side of the barrel, and the pressure relief valve is connected to the filling trough.

[0012] By adopting the above technical solution, the pressure relief valve can facilitate the operator to release air and perform pressure relief operations inside the filling tank, further ensuring that the raw materials are completely filled inside the filling tank.

[0013] A further improvement to the technical solution of this application is that a cooling water jacket is fixedly installed on the outer surface of the connecting column at the bottom of the hopper.

[0014] The above technical solution uses a cooling water jacket to cool the connecting column, reducing the impact of high temperature on the raw materials during the conveying process, preventing the raw materials from softening and sticking too early before entering, and ensuring normal feeding of the raw materials.

[0015] A further improvement to the technical solution of this application is that a heat insulation sleeve is fixedly installed inside the connecting sleeve at the left end of the screw body.

[0016] By adopting the above technical solution, the position between the end of the screw body and the gearbox can be insulated by setting a heat insulation sleeve, thereby further reducing the possibility of the screw body conducting high temperature to the gearbox.

[0017] A further improvement to the technical solution of this application is that the interior of the heat insulation jacket is hollow, and the interior of the heat insulation jacket is filled with heat insulation cotton.

[0018] By adopting the above technical solution, the heat insulation effect can be improved and the service life of the gearbox and other components can be extended by making the heat insulation jacket hollow and by setting heat insulation cotton.

[0019] In summary, this application includes at least one of the following beneficial technical effects: 1. This application provides a sealing and heat insulation structure for the screw connection of a high-temperature extruder. By placing packing inside the connecting sleeve around the screw body, a mechanical seal can be formed. Furthermore, by filling the filling groove with the same solid or low-temperature raw material as the extruded material, these raw materials melt upon heating near the high-temperature barrel end, forming a viscous melt sealing layer. The high viscosity of this layer prevents the internal high-pressure melt from leaking outward, thus forming a melt seal. This creates a double seal, reducing the possibility of material leakage. Moreover, the filling material can absorb some heat, thereby reducing the temperature in that area and mitigating problems caused by high-temperature conduction.

[0020] 2. This application provides a sealing and heat insulation structure for the screw connection of a high-temperature extruder. By setting a cooling ring and other matching structures, cooling water circulates inside the spiral groove to continuously cool the packing, preventing the packing from hardening and failing due to high temperature. At the same time, it also cools the screw body to a certain extent, further reducing the possibility of the screw body conducting high temperature to the gearbox.

[0021] 3. This application provides a sealing and heat insulation structure for the screw connection part of a high-temperature extruder. By setting a connecting column and its internal structure, the feeding screw is driven by a motor to rotate, which can actively guide the solid or low-temperature raw materials that are the same as the extruded material downwards, ensuring that they enter the filling tank normally, thereby reducing the possibility of blockage at the filling tank inlet and ensuring normal use of the filling tank. Attached Figure Description

[0022] Figure 1 This is a perspective view of this application; Figure 2 This is a partial structural schematic diagram of the connecting sleeve in this application; Figure 3 This is a partial structural diagram of the cooling ring cross-section of this application; Figure 4 This application is Figure 2 Enlarged structural diagram at point A in the middle.

[0023] Explanation of reference numerals in the attached drawings: 1. Gearbox; 2. Connecting sleeve; 3. Barrel; 4. Screw body; 5. Connecting column; 6. Pressure relief valve; 7. Packing packing; 8. Cooling ring; 9. Water inlet pipe; 10. Drain pipe; 11. Heat insulation sleeve; 12. Insulation cotton; 13. Spiral groove; 14. Filling groove; 15. Feeding screw; 16. Motor; 17. Hopper; 18. Cooling water jacket. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0025] Example 1 See Figure 1 and Figure 2 This application provides a sealing and heat insulation structure for the screw connection part of a high-temperature extruder, including a gearbox 1, a connecting sleeve 2 fixedly installed on the right side of the gearbox 1, a barrel 3 fixedly connected to the right side of the connecting sleeve 2, a screw body 4 disposed inside the barrel 3, the screw body 4 passing through the interior of the connecting sleeve 2 and connected to the gearbox 1, the interior of the connecting sleeve 2 being filled with packing 7, a filling groove 14 being opened inside the barrel 3 on the right side of the packing 7, the filling groove 14 being filled with solid or low-temperature raw material the same as the extruded material, and the filling groove 14 being located on the periphery of the screw body 4.

[0026] In this embodiment, the packing 7 and the filling groove 14 cooperate with each other. The packing 7 is fixed inside the connecting sleeve 2 on the periphery of the screw body 4, forming a mechanical seal. By filling the filling groove 14 with the same solid or low-temperature raw material as the extruded material, these raw materials melt when heated near the high-temperature barrel 3 end, forming a viscous melt sealing layer. The high viscosity of the melt prevents the internal high-pressure melt from leaking outward, thus forming a double seal, thereby reducing material leakage. Furthermore, the raw material can absorb some heat after filling, thereby reducing the temperature in this area and reducing the problem of high-temperature conduction.

[0027] Example 2 See Figure 1 , Figure 2 and Figure 3 Based on Embodiment 1, this application provides a technical solution: Preferably, a cooling ring 8 is fixedly installed on the periphery of the packing 7, a spiral groove 13 is opened inside the cooling ring 8, a water inlet pipe 9 is fixedly installed on the top of the connecting sleeve 2, and a drain pipe 10 is fixedly installed on the top of the connecting sleeve 2 on the right side of the water inlet pipe 9. The water inlet pipe 9 and the drain pipe 10 are both interconnected with the spiral groove 13.

[0028] In this embodiment, through the cooperation between the cooling ring 8 and other cooperating structures, and by connecting the water inlet pipe 9 and the drain pipe 10 to an external cooling water supply device, cooling water can circulate inside the spiral groove 13, thereby continuously cooling the packing 7 and preventing the packing 7 from hardening and failing due to high temperature. At the same time, it also has a cooling effect on the screw body 4 to a certain extent, further reducing the possibility of the screw body 4 conducting high temperature to the gearbox 1.

[0029] Example 3 See Figure 2 , Figure 3 and Figure 4 Based on Embodiment 2, this application provides a technical solution: Preferably, a connecting column 5 is fixedly installed on the top of the barrel 3 at the top of the filling trough 14, a feeding screw 15 is rotatably installed inside the connecting column 5, a motor 16 is fixedly installed on the top of the connecting column 5, the output shaft of the motor 16 is fixedly connected to the feeding screw 15, and a hopper 17 is fixedly connected to the right side of the connecting column 5; a pressure relief valve 6 is fixedly installed on the front side of the barrel 3, and the pressure relief valve 6 is interconnected with the filling trough 14; a cooling water jacket 18 is fixedly installed on the outer surface of the connecting column 5 at the bottom of the hopper 17. A heat insulation sleeve 11 is fixedly installed inside the connecting sleeve 2 at the left end of the screw body 4; the heat insulation sleeve 11 is hollow inside, and heat insulation cotton 12 is placed inside the heat insulation sleeve 11.

[0030] In this embodiment, through the cooperation between the connecting column 5 and its internal structure, wherein the motor 16 drives the feeding screw 15 to rotate, the raw materials fed from the hopper 17 into the connecting column 5 can be actively guided downwards, ensuring that they enter the filling trough 14 normally, reducing the possibility of blockage at the inlet of the filling trough 14, ensuring normal use of the filling trough 14, and sealing the outer surface of the screw body 4; and by setting a pressure relief valve 6, the operator can easily release air and perform pressure relief operations inside the filling trough 14, further ensuring that the raw materials are completely filled inside the filling trough 14; by setting a cooling water jacket 18, the connecting column 5 can be cooled, reducing the impact of high temperature on the raw materials during the conveying process, preventing the raw materials from softening and sticking too early before entering, and ensuring normal feeding of the raw materials; By setting up the heat insulation sleeve 11, the position between the end of the screw body 4 and the gearbox 1 can be heat-insulated, thereby further reducing the possibility of the screw body 4 conducting high temperature to the gearbox 1; by setting the interior of the heat insulation sleeve 11 to be hollow and by setting up the heat insulation cotton 12, the heat insulation effect can be improved and the service life of the gearbox 1 and other components can be extended.

[0031] The working principle of the sealing and heat insulation structure for the screw connection of a high-temperature extruder is explained in detail below.

[0032] like Figures 1-4 As shown, the operator appropriately opens the pressure relief valve 6 to release the gas inside the filling tank 14, thus relieving pressure. Then, the operator controls the motor 16 to drive the feeding screw 15 to rotate, and pours the same solid or low-temperature raw material as the extruded material into the connecting column 5 through the hopper 17. The rotating feeding screw 15 feeds the material into the filling tank 14, filling it. The water inlet pipe 9 and the drain pipe 10 are connected to the external cooling water supply equipment. During the use of the high-temperature extruder, the raw material in the filling tank 14 melts near the high-temperature barrel 3, forming a viscous melt sealing layer. Its high viscosity prevents the internal high-pressure melt from leaking outward. The packing packing 7 provides a mechanical seal for the screw body 4. At the same time, cooling water flows through the spiral groove 13 to cool the packing packing 7, ensuring its support. The heat insulation sleeve 11 and the heat insulation cotton 12 provide heat insulation between the screw body 4 and the gearbox 1, protecting the gearbox 1 and other components.

[0033] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sealing and heat-insulating structure for the screw connection of a high-temperature extruder, comprising a gearbox (1), characterized in that: A connecting sleeve (2) is fixedly installed on the right side of the gearbox (1). A barrel (3) is fixedly connected to the right side of the connecting sleeve (2). A screw body (4) is provided inside the barrel (3). The screw body (4) passes through the inside of the connecting sleeve (2) and is connected to the gearbox (1). The inside of the connecting sleeve (2) is filled with packing (7). A filling groove (14) is opened inside the barrel (3) on the right side of the packing (7). The filling groove (14) is filled with solid or low-temperature raw materials that are the same as the extruded material. The filling groove (14) is located on the periphery of the screw body (4).

2. The sealing and heat insulation structure for the screw connection of a high-temperature extruder according to claim 1, characterized in that: A cooling ring (8) is fixedly installed on the periphery of the packing (7). A spiral groove (13) is opened inside the cooling ring (8). A water inlet pipe (9) is fixedly installed on the top of the connecting sleeve (2). A drain pipe (10) is fixedly installed on the top of the connecting sleeve (2) on the right side of the water inlet pipe (9). The water inlet pipe (9) and the drain pipe (10) are both connected to the spiral groove (13).

3. The sealing and heat insulation structure for the screw connection of a high-temperature extruder according to claim 1, characterized in that: A connecting column (5) is fixedly installed on the top of the barrel (3) at the top of the filling trough (14). A feeding screw (15) is rotatably installed inside the connecting column (5). A motor (16) is fixedly installed on the top of the connecting column (5). The output shaft of the motor (16) is fixedly connected to the feeding screw (15). A hopper (17) is fixedly connected to the right side of the connecting column (5).

4. The sealing and heat insulation structure for the screw connection of a high-temperature extruder according to claim 3, characterized in that: A pressure relief valve (6) is fixedly installed on the front side of the barrel (3), and the pressure relief valve (6) is connected to the filling trough (14).

5. A sealing and heat-insulating structure for the screw connection of a high-temperature extruder according to claim 4, characterized in that: A cooling water jacket (18) is fixedly installed on the outer surface of the connecting column (5) at the bottom of the hopper (17).

6. A sealing and heat-insulating structure for the screw connection of a high-temperature extruder according to claim 1, characterized in that: A heat insulation sleeve (11) is fixedly installed inside the connecting sleeve (2) at the left end of the screw body (4).

7. A sealing and heat-insulating structure for the screw connection of a high-temperature extruder according to claim 6, characterized in that: The heat insulation sleeve (11) is hollow inside, and the heat insulation sleeve (11) is filled with heat insulation cotton (12).

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