Efficient foaming device for XPS plate production
By incorporating an impeller and heating ring on the outer wall of the screw, the problem of uneven resin melting in XPS board production was solved, achieving refined and uniform resin melting and improving the efficiency and quality of the foaming device.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU FUDA THERMAL INSULATION MATERIALS CO LTD
- Filing Date
- 2025-05-19
- Publication Date
- 2026-04-21
AI Technical Summary
In the production of XPS sheets using existing single-screw extruders, the resin in the central area is difficult to melt properly, which affects the subsequent extrusion process after foaming.
The design incorporates an impeller and a heating ring on the outer wall of the screw. The impeller contains thermally conductive silicone grease, which transfers heat through the screw and works with the heating ring to reheat the resin. The impeller also provides uniform stirring and heat exchange, ensuring that the resin melts precisely within the expansion section.
It improves the uniformity of resin melting and foaming quality, ensures complete melting of resin in the central area, and enhances the extrusion quality after foaming.
Smart Images
Figure CN224145193U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of XPS board processing technology, specifically to a high-efficiency foaming device for XPS board production. Background Technology
[0002] XPS insulation board is a high-performance building insulation material with high compressive strength, low water absorption, and good thermal insulation performance. It is widely used for thermal insulation of building walls, roofs, floors and other parts.
[0003] In the production of XPS sheets, extruders are often used to melt the molten resin before extrusion molding. Taking the commonly used single-screw extruder as an example, the heating area of this type of machine is usually located on the inner wall of the foaming channel in a ring shape, and the heating area is fixed. The process of heating the resin is from the outside to the inside. When the pushing channel is completely filled with molten resin, it may be difficult for the resin in some areas in the center of the channel to melt well, which will have an adverse effect on the subsequent extrusion process.
[0004] Therefore, this utility model proposes a high-efficiency foaming device for XPS board production. Utility Model Content
[0005] The purpose of this utility model is to provide a high-efficiency foaming device for XPS board production, so as to solve the problems mentioned in the background art. To achieve the above objective, this utility model provides the following technical solution: A high-efficiency foaming device for XPS board production, including a base, an extrusion channel above the base, a screw inside the extrusion channel, a heating ring inside the extrusion channel, an impeller on the outer wall of the screw, the impeller including multiple equidistantly distributed blades, and an expansion section outside the extrusion channel, the expansion section being located outside the impeller, and a heating ring on the inner wall of the expansion section.
[0006] Preferably, a heating rod is provided inside the screw, and the heat generated by the heating rod is transferred to the outside through the screw.
[0007] Preferably, the inner wall of the impeller is fixedly connected to the outer wall of the screw, and the interior of the impeller is hollow and contains thermally conductive silicone grease.
[0008] Preferably, the expansion section is shaped like an outwardly expanding cone, and the heating ring is located in the area where the expansion section has the largest opening.
[0009] Preferably, the end of the heating coil is provided with a fixing ring, the cross-section of which is trapezoidal, and the molten resin flows from the inclined area of the fixing ring to the expansion part.
[0010] Preferably, the impeller wall has multiple through holes that are evenly distributed.
[0011] This utility model has at least the following beneficial effects:
[0012] 1. In this utility model, through the conveying effect of the screw, the melted particles gradually enter the interior of the expansion section and accumulate in the maximum expansion area of the expansion section. The heating ring here can reheat the molten resin; at the same time, the impeller will also uniformly exchange the substances inside the molten resin. Therefore, the rotating impeller can cooperate with the heating ring here to make the unmelted resin in the liquid undergo fine melting in the expansion section, ensuring that the resin in the central area of the channel is well melted, and improving the extrusion quality after foaming.
[0013] 2. In this invention, while the impeller stirs the molten resin, the heat transferred by the heating rod is also transported to the outer wall of the impeller through the thermally conductive silicone grease. This allows the molten resin accumulated inside the expansion section to receive heat from the inside out, which is superimposed with the heat emitted by the heating ring, thereby further enhancing the melting effect of the resin and improving the melting uniformity. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0015] Figure 2 This is a side view of the extrusion channel structure of this utility model in cross section;
[0016] Figure 3 This is another angle view of the cross-sectional structure of the extrusion channel of this utility model;
[0017] Figure 4 This utility model Figure 3 Enlarged view of the structure of region A in the middle.
[0018] In the diagram: 1-base; 2-extrusion channel; 3-screw; 4-heating coil; 5-impeller; 6-fan blade; 7-expansion section; 8-heating ring; 9-heating rod; 10-fixing ring; 11-through hole. Detailed Implementation
[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0020] Please see Figure 1-4 This utility model provides a technical solution: a high-efficiency foaming device for XPS board production, comprising:
[0021] Example 1
[0022] The base 1 has an extrusion channel 2 fixedly connected to it. The extrusion channel 2 has a screw 3 rotatably connected to it and a heating coil 4 fixedly connected to it. The screw 3 is driven by an external power device. The heating coil 4 automatically heats up during the operation of the extruder to melt the resin in the extrusion channel 2. The above is the prior art and will not be described in detail.
[0023] In this design, the outer wall of the screw 3 is provided with an impeller 5, and the inner wall of the impeller 5 is fixedly connected to the outer wall of the screw 3. The impeller 5 includes multiple equidistant fan blades 6. The extrusion channel 2 includes an expansion section 7, which is located outside the impeller 5. The inner wall of the expansion section 7 is provided with a heating ring 8. The expansion section 7 is shaped as an outwardly expanding cone. The heating ring 8 is located in the area where the expansion section 7 has the largest opening. The heating ring 8 is fixedly connected to the inner wall of the expansion section 7. The end of the heating ring 4 is provided with a fixing ring 10, and the outer wall of the fixing ring 10 is fixedly connected to the extrusion channel 2. The cross-section of the fixing ring 10 is trapezoidal. The molten resin flows from the inclined area of the fixing ring 10 to the expansion section 7. The inclined surface of the fixing ring 10 has a certain blocking effect on the molten resin, which allows the molten resin to pass through the extrusion channel 2 more slowly, thereby prolonging the melting time of the resin by the heating ring 4.
[0024] Working principle:
[0025] After the resin enters the extrusion channel 2 from the feed hopper, it is propelled into the heating ring 4 by the rotation of the screw 3 for hot melting. Under the pushing action of the screw 3, the melted particles gradually enter the expansion section 7. Due to the special inclined surface effect of the expansion section 7, the molten resin accumulates in the maximum expansion area of the expansion section 7. The heating ring 8 here can provide secondary heating for the molten resin. At the same time, the impeller 5 also rotates with the screw 3. Since the fan blades 6 on the impeller 5 are all vertically and evenly distributed, the rotation of the impeller 5 is only used to uniformly exchange the substances inside the molten resin, rather than to push it. The spiral blades in the other areas of the screw 3 can slowly push the molten resin. Therefore, the rotating impeller 5 can cooperate with the heating ring 8 here to make the unmelted resin in the liquid undergo fine melting in the expansion section 7, ensuring that the resin in the central area of the channel is well melted, and improving the extrusion quality after foaming.
[0026] According to the above embodiments, Embodiment 2
[0027] The screw 3 has a heating rod 9 inside and is fixedly connected to it. The heat generated by the heating rod 9 is transferred to the outside through the screw 3, so that the screw 3 itself also has a certain amount of heat, which is beneficial to increase the temperature of the central area of the extrusion channel 2 and make the melting effect better. The impeller 5 has a hollow interior and is filled with thermally conductive silicone grease. The thermally conductive silicone grease has good thermal conductivity. The impeller 5 has multiple through holes 11 that are evenly distributed on the wall. The heat from the heating rod 9 can be better transferred to the interior of the thermally conductive silicone grease after passing through the through holes 11, thereby enabling the impeller 5 to better transfer heat to the outside.
[0028] When the impeller 5 stirs the molten resin, the heat transferred by the heating rod 9 is also quickly transported to the outer wall of the impeller 5 through the thermal grease, so that the molten resin accumulated inside the expansion section 7 is heated from the inside out. This heat is superimposed on the heat emitted by the heating ring 8, which can further enhance the melting effect of the resin and improve the melting uniformity.
[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A high-efficiency foaming device for XPS board production, comprising a base (1), an extrusion channel (2) above the base (1), and a screw (3) inside the extrusion channel (2), characterized in that: The extrusion channel (2) is provided with a heating ring (4) inside, and the screw (3) is provided with an impeller (5) on its outer wall. The impeller (5) includes multiple equidistant fan blades (6). The extrusion channel (2) includes an expansion section (7) located outside the impeller (5). The inner wall of the expansion section (7) is provided with a heating ring (8).
2. The high efficiency foaming device for XPS board production according to claim 1, characterized in that: The screw (3) is equipped with a heating rod (9) inside, and the heat generated by the heating rod (9) is transferred to the outside through the screw (3).
3. The high efficiency foaming device for XPS board production according to claim 2, characterized in that: The inner wall of the impeller (5) is fixedly connected to the outer wall of the screw (3). The interior of the impeller (5) is hollow and contains thermally conductive silicone grease.
4. The high efficiency foaming device for XPS board production of claim 1, wherein: The expansion section (7) is shaped like an outwardly expanding cone, and the heating ring (8) is located in the area where the expansion section (7) has the largest opening.
5. The high efficiency foaming device for XPS board production according to claim 1, characterized in that: The heating coil (4) has a fixing ring (10) at its end. The cross-section of the fixing ring (10) is trapezoidal. Molten resin flows from the inclined area of the fixing ring (10) to the expansion part (7).
6. The high efficiency foaming device for XPS board production according to claim 3, characterized in that: The impeller (5) has multiple through holes (11) that are evenly distributed on its wall.