Drying type machine barrel screw structure
By designing a drying barrel screw structure containing heating rings and multi-function screws, the problem of moisture in raw materials in injection molding is solved, and the raw materials are directly put on the machine, reducing equipment energy consumption and production costs.
Patent Information
- Application Number
- CN202422216108.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-10
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-09-10
AI Technical Summary
During plastic injection molding, water on the surface of the raw material will affect the molding appearance and internal structure of the plastic parts, resulting in the need of an external dryer or dehumidifier to reduce moisture, which increases equipment cost and energy consumption.
A drying barrel screw structure is designed, including a barrel and a screw. The screw can be rotatably installed in the inner flow channel of the barrel. A heating ring is provided outside the barrel. The screw is equipped with multiple functional sections, including feed section, drying pressing section, drying material homogenization section, exhaust section, compression section and metering section. The screw is equipped with an inlet and a water vapor discharge hole.
Through this structure, raw materials can be used directly on the machine without the need for external dryers or dehumidification equipment, which reduces the energy consumption and production costs of equipment, reduces the increase in workshop temperature, and reduces the energy consumption of refrigeration equipment.
Smart Images
Figure CN222987428U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of injection molding equipment, and more specifically, to a drying type barrel screw structure. Background Art
[0002] During the process of plastic injection molding production, the water on the surface of raw materials will affect the appearance and internal structure of plastic parts after molding, such as drawing, corrugation, bubbles, etc. Therefore, before injecting materials, the injection molding machine generally needs to dry the raw materials to reduce the moisture content in the raw materials. So, external drying machines or dehumidifiers and other equipment are required. However, the heat radiated by the drying machine can raise the temperature of the injection molding workshop to above 40 degrees Celsius. However, a constant temperature and humidity environment needs to be ensured in the injection molding workshop. Therefore, refrigeration equipment also needs to be used in the workshop. But this requires the use of multiple pieces of equipment, resulting in an increase in equipment costs and a significant increase in energy consumption. Summary of the Utility Model
[0003] An object of the utility model is to overcome the above-mentioned defects in the prior art, and provide a drying type barrel screw structure which can enable an injection molding machine to directly use raw materials without external drying machines or dehumidification equipment, reduce equipment energy consumption, and reduce production costs.
[0004] To achieve the above object, the utility model provides a drying type barrel screw structure, including a barrel and a screw. The screw is rotatably installed in the internal flow channel of the barrel. A plurality of groups of heating coils are arranged on the outside of the barrel along its axial direction. The screw is provided with a feeding section, a drying and pressurizing section, a drying and homogenizing section, an exhaust section, a compression section, and a metering section which are connected in sequence. The screw is provided with a feeding port and a steam discharge hole which communicate with the internal flow channel of the barrel. The feeding port is located at the starting end of the feeding section of the screw, and the steam discharge hole is located at the starting end of the exhaust section.
[0005] Preferably, threads are provided on the outside of the feeding section, the drying and pressurizing section, the exhaust section, the compression section, and the metering section of the screw. A plurality of inclined homogenizing grooves are circumferentially distributed on the outside of the drying and homogenizing section of the screw.
[0006] Preferably, the single-section length of the feeding section of the screw accounts for 25%-28% of the total length of the feeding section, the drying and pressurizing section, the drying and homogenizing section, the exhaust section, the compression section, and the metering section.
[0007] Preferably, the single-section length of the drying and pressurizing section of the screw accounts for 4%-6% of the total length of the feeding section, the drying and pressurizing section, the drying and homogenizing section, the exhaust section, the compression section, and the metering section.
[0008] Preferably, the single-section length of the exhaust section of the screw accounts for 28%-32% of the total length of the feeding section, the drying and pressurizing section, the drying and homogenizing section, the exhaust section, the compression section, and the metering section.
[0009] Preferably, the single-segment length of the compression section of the screw accounts for 20%-25% of the total length of the feeding section, the drying and pressurizing section, the drying and homogenizing section, the exhaust section, the compression section and the metering section.
[0010] Preferably, the single-segment length of the metering section of the screw accounts for 12%-14% of the total length of the feeding section, the drying and pressurizing section, the drying and homogenizing section, the exhaust section, the compression section and the metering section.
[0011] Preferably, the steam discharge hole is located at the position of 40%-44% of the total length of the feeding section, the drying and pressurizing section, the drying and homogenizing section, the exhaust section, the compression section and the metering section of the screw.
[0012] Preferably, the steam discharge hole is located at the tangent point position in the rotation direction of the screw.
[0013] Preferably, the bottom diameter ratio of the exhaust section to the feeding section of the screw is 1:1.17 - 1.22.
[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0015] The structure of the present utility model is reasonably designed. The screw is installed in the internal flow channel of the barrel. A heating coil is provided outside the barrel. The screw is provided with a feeding section, a drying and pressurizing section, a drying and homogenizing section, an exhaust section, a compression section and a metering section. When the raw material enters the inside of the barrel from the feeding port of the barrel, the heating coil can heat and dry the raw material. When the raw material in the unmolten state (150°C - 180°C) enters the exhaust section after passing through the drying and homogenizing section, the moisture in the raw material can be directly discharged from the steam discharge hole. In this way, the injection molding machine does not need to be externally connected to a dryer or dehumidification equipment, and the raw material can be directly used on the machine, saving the energy consumption of the drying equipment or dehumidification equipment. Moreover, without the drying equipment, the temperature in the workshop will decrease, and the energy consumption of the refrigeration equipment will also decrease, greatly reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0017] Figure 1 It is a schematic structural diagram of the drying-type barrel screw structure provided by the embodiment of the present utility model;
[0018] Figure 2 It is a schematic structural diagram of the screw provided by the embodiment of the present utility model;
[0019] Figure 3 is an enlarged view of the drying and homogenizing section of the screw provided by the embodiment of the present utility model;
[0020] Figure 4 is a sectional view of the barrel corresponding to the position of the steam discharge hole provided by the embodiment of the present utility model. Specific Embodiments
[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.
[0022] Please refer to Figure 1 , the embodiment of the present utility model provides a drying barrel and screw structure, including components such as a barrel 1, a screw 2, and a heating coil 3. The screw 2 is rotatably installed in the internal flow channel of the barrel 1. A plurality of groups of heating coils 3 are provided and distributed along the axial direction of the barrel 1 outside the barrel 1. Each component of this embodiment will be described in detail below with reference to the accompanying drawings.
[0023] As Figure 1 , Figure 2 and Figure 3 shown, the screw 2 may be provided with a feeding section 21, a drying and pressurizing section 22, a drying and homogenizing section 23, an exhaust section 24, a compression section 25, and a metering section 26 connected in sequence. Specifically, threads are provided on the outside of the feeding section 21, the drying and pressurizing section 22, the exhaust section 24, the compression section 25, and the metering section 26 of the screw 2. A plurality of inclined homogenizing grooves 231 are distributed around the outside of the drying and homogenizing section 23 of the screw 2. Among them, the drying and pressurizing section 22 and the drying and homogenizing section 23 may be collectively referred to as the drying section.
[0024] As Figure 2 shown, the bottom diameter of the drying and pressurizing section 22 of the screw 2 may gradually increase in the direction of the drying and homogenizing section 23, and the bottom diameter of the compression section 25 of the screw 2 may gradually increase in the direction of the metering section 26.
[0025] Among them, the ratio of the bottom diameter of the exhaust section 24 of the screw 2 to that of the feeding section 21 may preferably be set to 1:1.17 - 1.22. Of course, according to actual needs, in other embodiments, the bottom diameter ratio of the two may also be set arbitrarily, not limited to this embodiment.
[0026] As a preferred embodiment, the single-segment length of the feeding section 21 of the screw 2 may account for 25%-28% of the total length of the feeding section 21, the drying and pressurizing section 22, the drying and homogenizing section 23, the exhaust section 24, the compression section 25, and the metering section 26. The single-segment length of the drying and pressurizing section 22 of the screw 2 may account for 4%-6% of the total length of the feeding section 21, the drying and pressurizing section 22, the drying and homogenizing section 23, the exhaust section 24, the compression section 25, and the metering section 26. The single-segment length of the exhaust section 24 of the screw 2 may account for 28%-32% of the total length of the feeding section 21, the drying and pressurizing section 22, the drying and homogenizing section 23, the exhaust section 24, the compression section 25, and the metering section 26. The single-segment length of the compression section 25 of the screw 2 may account for 20%-25% of the total length of the feeding section 21, the drying and pressurizing section 22, the drying and homogenizing section 23, the exhaust section 24, the compression section 25, and the metering section 26. The single-segment length of the metering section 26 of the screw 2 may account for 12%-14% of the total length of the feeding section 21, the drying and pressurizing section 22, the drying and homogenizing section 23, the exhaust section 24, the compression section 25, and the metering section 26. Of course, according to actual needs, in other embodiments, its length can also be increased or decreased arbitrarily, not limited to this embodiment.
[0027] As Figure 1 shown, the screw 2 is provided with a feed port 11 and a steam discharge hole 12 that communicate with the internal flow channel of the barrel 1. The feed port 11 is located at the starting end of the feeding section 21 of the screw 2, and the steam discharge hole 12 is located at the starting end of the exhaust section 24.
[0028] Preferably, the steam discharge hole 12 may be located at a position of 40%-44% of the total length of the feeding section 21, the drying and pressurizing section 22, the drying and homogenizing section 23, the exhaust section 24, the compression section 25, and the metering section 26 of the screw 2.
[0029] As Figure 4 shown, the steam discharge hole 12 may be located at the tangent point position in the rotation direction of the screw 2.
[0030] The working principle of the present utility model is as follows:
[0031] When the raw material enters the internal flow channel of the barrel 1 from the feed port 11 of the barrel 1, it is conveyed forward through the feeding section 21 of the screw 2, and then undergoes first-order compression through the drying and pressurizing section 22 and enters the drying and homogenizing section 23 for homogenization. Before entering the exhaust section 24, the heating coil heats the raw material to 150°C - 180°C. At this time, the raw material is in an incompletely molten state. Then the raw material enters the exhaust section 24 for pressure relief and exhaust, and the moisture or other volatile substances in the raw material can be discharged from the steam discharge hole 12. Subsequently, the raw material heated to the molten state in the exhaust section 24 is conveyed to the compression section 25 for second-order compression, and then the raw material is sent into the melt storage cavity of the injection cylinder through the metering section 26 of the screw 2, and finally injected into the mold to form a product.
[0032] In summary, the structural design of the present utility model is reasonable. It enables the injection molding machine to directly use the raw materials without external drying machines or dehumidifying equipment, saving the energy consumption of the drying or dehumidifying equipment. Moreover, after removing the drying equipment, the temperature in the workshop will decrease, and the energy consumption of the refrigeration equipment will also decrease, greatly reducing the production cost.
[0033] The above embodiments are preferred embodiments of the present utility model. However, the embodiments of the present utility model are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be equivalent replacement methods and are all included in the protection scope of the present utility model.
Claims
1. A drying type barrel screw structure, comprising a barrel and a screw, wherein the screw can be rotatably mounted in an internal flow channel of the barrel, and the outside of the barrel is provided with a plurality of groups of heating rings distributed along its axial direction, characterized in that: The screw is provided with a feed section, a baking pressurization section, a baking homogenization section, an exhaust section, a compression section and a metering section which are connected in sequence. The screw is provided with a feed port and a water vapor exhaust hole which are connected to the internal flow channel of the barrel. The feed port is located at the starting end of the feed section of the screw, and the water vapor exhaust hole is located at the starting end of the exhaust section.
2. A drying type barrel screw structure according to claim 1, characterized in that: The feed section, baking material pressurizing section, exhaust section, compression section and metering section of the screw are all provided with threads on the outside, and the baking material homogenizing section of the screw is surrounded by a plurality of obliquely arranged homogenizing grooves.
3. A drying type barrel screw structure according to claim 1, characterized in that: The length of a single section of the feeding section of the screw accounts for 25%-28% of the total length of the feeding section, the drying material pressurizing section, the drying material homogenizing section, the exhaust section, the compression section and the metering section.
4. A drying type barrel screw structure according to claim 1, characterized in that: The length of a single section of the baking material pressurizing section of the screw accounts for 4%-6% of the total length of the feeding section, the baking material pressurizing section, the baking material homogenizing section, the exhaust section, the compression section and the metering section.
5. The drying type barrel screw structure according to claim 1, characterized in that: The length of a single exhaust section of the screw accounts for 28%-32% of the total length of the feeding section, the drying material pressurizing section, the drying material homogenizing section, the exhaust section, the compression section and the metering section.
6. A drying type barrel screw structure according to claim 1, characterized in that: The length of a single compression section of the screw accounts for 20%-25% of the total length of the feeding section, the baking material pressurizing section, the baking material homogenizing section, the exhaust section, the compression section and the metering section.
7. A drying type barrel screw structure according to claim 1, characterized in that: The length of a single metering section of the screw accounts for 12%-14% of the total length of the feeding section, the baking material pressurizing section, the baking material homogenizing section, the exhaust section, the compression section and the metering section.
8. The drying type barrel screw structure according to claim 1, characterized in that: The water vapor discharge hole is located at 40%-44% of the total length of the screw's feeding section, baking material pressurizing section, baking material homogenizing section, exhaust section, compression section and metering section.
9. A drying type barrel screw structure according to claim 1, characterized in that: The water vapor discharge hole is located at a tangent point position in the rotation direction of the screw.
10. A drying type barrel screw structure according to claim 1, characterized in that: The bottom diameter ratio of the exhaust section to the feed section of the screw is 1:1.17-1.22.