Multi-section screw rod for extrusion molding of thin film
By designing a multi-segment screw structure and a composite ceramic coating, the problem of poor mixing effect of traditional screws has been solved, achieving more efficient material mixing and improved product quality, which is suitable for film extrusion molding.
Patent Information
- Application Number
- CN202423056032.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-12-10
AI Technical Summary
In the existing technology, the mixing effect of traditional screws is not good and cannot meet the user's requirements for better mixing effect. Moreover, the material is only pushed and mixed through different screw structures, resulting in insufficient mixing degree.
Design a multi-segment screw for film extrusion molding, including a first mixing section, a second mixing section, a third mixing section, a first threaded section, a second threaded section, a third threaded section, a fourth threaded section, and a helical section. Combined with pins, strip-shaped mixing grooves, transition sections, and composite ceramic coatings, a multi-segment threaded mixing structure is achieved, improving the mixing effect and degree of mixing.
The multi-segment thread structure design significantly improves the mixing effect and degree of materials, ensuring more uniform mixing of raw materials and improving product quality. Furthermore, the hard chrome layer, nitriding layer, and composite ceramic coating enhance the hardness and corrosion resistance of the screw, extending its service life.
Smart Images
Figure CN223559036U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field technology of screw rod especially is a kind of multi-section screw rod for film extrusion molding. BACKGROUND
[0002] Injection molding is the main molding method of plastic products, and screw rod is one of the key components of injection molding machine. It has the functions of conveying, mixing and injection. It rotates in the barrel of the injection molding machine. The production process is as follows: first, the solid plastic in granular or powdery form is plasticized, including heating, compacting, homogenizing and mixing processes, to become a plastic melt with uniform density, viscosity and composition, which has good plasticity. Then, by applying a certain pressure, the plastic melt is injected into the cavity of the molding mold at a certain flow rate. After the plastic melt cools and sets, a plastic product with the same shape as the mold cavity is obtained. With the increasing demand for product quality of injection molding, the mixing effect of the screw rod on the raw materials also needs to be improved.
[0003] In the prior art, the screw rod for mixing raw materials usually has threads on the screw rod to advance and mix the material. The traditional mixing screw rod usually has only one mixing head and one thread segment to achieve mixing of the raw materials, but the mixing effect is not good enough to meet the user's requirements for better mixing effect.
[0004] Later, a screw rod appeared on the market, which usually includes a screw rod body that includes a handle, a connecting part and a rod body connected in order from right to left. One or two different threads are usually provided on the rod body. In this way, the material is advanced and mixed by each thread. Although different threads are provided for advancing and mixing, the difference between different threads is limited to different pitches, widths and leads, and there is no change in the basic structure. The material is only mixed by the thread structure, and usually only has one or two segments for advancing and mixing, which cannot achieve different mixing effects through different structures, resulting in poor mixing degree and mixing effect.
[0005] Therefore, it is necessary to research a new technical solution to solve the above problems. UTILITY MODEL CONTENTS
[0006] Therefore, the utility model provides a multi-section screw rod for film extrusion molding, which realizes multi-section thread mixing structure design through the design of the first mixing section, the second mixing section, the third mixing section, the first thread section, the second thread section, the third thread section, the fourth thread section and the spiral section, so that the material is advanced and mixed by the multi-section thread mixing structure, improving the mixing effect and mixing degree.
[0007] In order to achieve the above object, the utility model discloses the following technical scheme:
[0008] A kind of multi-section screw for film extrusion molding, including screw main body;The screw main body is sequentially provided with first mixing section, first thread section, second mixing section, third mixing section, second thread section, third thread section, fourth thread section, helical section and connecting section from left to right;
[0009] The outer spacing of the first mixing section is provided with several pins;The outer peripheral side wall of the second mixing section and the third mixing section is concavely provided with multiple groups of strip-shaped mixing grooves;
[0010] Each group of strip-shaped mixing grooves includes strip-shaped inlet groove and strip-shaped outlet groove, and the inlet groove and the outlet groove are arranged at the outer peripheral side wall of the corresponding second mixing section and third mixing section with intersecting spacing;
[0011] The first transition section is arranged between the first mixing section and the first thread section;The second transition section is arranged between the second mixing section and the first thread section, and the first transition section and the second transition section are both light rod sections;
[0012] The outer peripheral side wall of the first thread section has first screw ridge;The outer peripheral side wall of the second thread section has second screw ridge, and the outer peripheral wall spacing of the third thread section is provided with third screw ridge and fourth screw ridge;The first screw ridge, the second screw ridge and the third screw ridge are secondary teeth, and the fourth screw ridge is primary tooth;
[0013] The surfaces of the first screw ridge, the second screw ridge, the third screw ridge and the fourth screw ridge are sequentially provided with nitriding layer, metal chromium layer and composite ceramic coating layer from outside to inside;
[0014] The first thread section, the second thread section, the third thread section and the fourth thread section all have screw groove;The surfaces of the screw grooves are plated with hard chromium layer.
[0015] As a preferred scheme, the outer peripheral side wall of the helical section is concavely provided with helical groove, and the right end of the helical section is connected to the left end of the connecting section.
[0016] As a preferred scheme, the connecting section includes first connecting part, inclined part and second connecting part;The left end of the first connecting part is connected to the helical section;The inclined part is obliquely arranged from the right end of the first connecting part;The second connecting part is connected to the right end of the inclined part.
[0017] As a preferred scheme, the bottom diameter of the first transition section is equal to the bottom diameter of the second transition section.
[0018] As a preferred scheme, the first mixing section, the first thread section, the second mixing section, the third mixing section, the second thread section, the third thread section, the fourth thread section and the helical section all have core column with circular cross section.
[0019] As a preferred solution, the composite ceramic coating comprises a chromium nitride layer and a carbon nitride layer.
[0020] As a preferred solution, the plurality of pins are arranged in a matrix on the outer peripheral side wall of the first mixing section.
[0021] As a preferred solution, the nitriding layer has a thickness greater than 0.2 mm.
[0022] As a preferred solution, the chromium metal layer has a thickness of 0.6-1 microns.
[0023] The utility model discloses a multi-section thread mixing structure of screw rod, and belongs to the field of mixing equipment.
[0024] Secondly, the first, second and third mixing sections are arranged to make the raw material mixing more uniform, thereby improving the quality of the product.
[0025] Finally, the hard chromium layer, nitriding layer, chromium metal layer and composite ceramic coating are designed to improve the hardness, high corrosion resistance and low friction coefficient of the screw rod.
[0026] To make the utility model more clear, the utility model will be described in detail below with the help of the drawings and specific embodiments. BRIEF DESCRIPTION OF DRAWINGS
[0027] Fig. 1 is the structure diagram of the embodiment of the utility model;
[0028] Fig. 2 is another structure diagram of the embodiment of the utility model;
[0029] Fig. 3 is the sectional view of the embodiment of the utility model;
[0030] Fig. 4 is the local schematic view of the embodiment of the utility model.
[0031] The figure mark is explained as follows:
[0032] 10, screw rod main body 11, first mixing section
[0033] 111, pin
[0034] 12, first thread section 13, second mixing section
[0035] 121、first screw flight
[0036] 14、third mixing section 15、second screw flight section
[0037] 151、second screw flight
[0038] 131、inlet strip groove 132、outlet strip groove
[0039] 16、third screw flight section 17、fourth screw flight section
[0040] 161、third screw flight 162、fourth screw flight
[0041] 18、helical section 19、connecting section
[0042] 191、first connecting portion 192、inclined portion
[0043] 193、second connecting portion
[0044] 101、first transition section 102、second transition section
[0045] 20、nitriding layer 30、metallic chromium layer
[0046] 40、composite ceramic coating. DETAILED DESCRIPTION
[0047] Please refer to Figs. 1 to 4 , which shows the specific structure of the embodiment of the utility model.
[0048] In the description of the utility model, it is necessary to explain that for the orientation words, if the orientation and position relationship indicated by the terms "up", "down", "front", "back", "left", "right" and the like is shown based on the drawings or normal wearing and using, it is only for the convenience of narrating the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific protection scope of the utility model.
[0049] A multi-section screw for film extrusion molding, comprising a screw body 10;The screw body 10 is sequentially provided with a first mixing section 11, a first screw flight section 12, a second mixing section 13, a third mixing section 14, a second screw flight section 15, a third screw flight section 16, a fourth screw flight section 17, a helical section 18 and a connecting section 19 from left to right.
[0050] Preferably, the first mixing section 11, the first screw flight section 12, the second mixing section 13, the third mixing section 14, the second screw flight section 15, the third screw flight section 16, the fourth screw flight section 17 and the helical section 18 all have a core column with a circular cross section.
[0051] The outer periphery of the first mixing section 11 is provided with a plurality of pins 111; preferably, the plurality of pins 111 are arranged in a matrix on the outer periphery of the first mixing section 11.
[0052] The outer periphery of the second mixing section 13 and the third mixing section 14 is concavely provided with a plurality of groups of strip-shaped mixing grooves; each group of strip-shaped mixing grooves comprises a strip-shaped inlet groove 131 and a strip-shaped outlet groove 132, which are arranged in an intersecting manner on the outer periphery of the corresponding second mixing section 13 and third mixing section 14;
[0053] The first mixing section 11 is provided with a first transition section 101 between the first mixing section 11 and the first threaded section 12; the second mixing section 13 is provided with a second transition section 102 between the second mixing section 13 and the first threaded section 12; the first transition section 101 and the second transition section 102 are both light rod sections; preferably, the bottom diameter of the first transition section 101 is equal to the bottom diameter of the second transition section 102.
[0054] The outer periphery of the first threaded section 12 is provided with a first screw ridge 121; the outer periphery of the second threaded section 15 is provided with a second screw ridge 151; the outer periphery of the third threaded section 16 is provided with a third screw ridge 161 and a fourth screw ridge 162; the first screw ridge 121, the second screw ridge 151, and the third screw ridge 161 are all secondary teeth, and the fourth screw ridge 162 is a primary tooth; the surfaces of the first screw ridge 121, the second screw ridge 151, the third screw ridge 161, and the fourth screw ridge 162 are sequentially provided, from the outside to the inside, with a nitriding layer 20, a metal chromium layer 30, and a composite ceramic coating 40; preferably, the composite ceramic coating 40 comprises a chromium nitride layer and a carbon nitride layer; preferably, the thickness of the nitriding layer 20 is greater than 0.2 mm; and preferably, the thickness of the metal chromium layer 30 is 0.6-1 μm.
[0055] In the present embodiment, the screw body 10 is made of chromium-molybdenum alloy steel; the metal chromium layer 30, which is deposited from metal chromium, serves as a connecting layer between the nitriding layer 20 and the composite ceramic coating 40, and can ensure that the composite ceramic coating 40 composed of chromium nitride and carbon nitride can be stably attached to the surface of the screw body 10 or the surface of the screw ridge; the composite ceramic coating 40 composed of chromium nitride and carbon nitride has the characteristics of high hardness, high corrosion resistance, and low friction coefficient; using the above-mentioned composite ceramic coating 40 as the outermost layer structure of the screw can effectively improve the wear resistance and corrosion resistance of the screw as a whole, thereby further prolonging the service life of the screw and improving the working efficiency of the screw.
[0056] In actual preparation, the screw body 10 made of the chromium molybdenum alloy steel is subjected to ion nitriding treatment in an argon environment at 400 DEG C, and the thickness of the nitriding layer 20 is ensured to be greater than 0.2 mm; then a metal chromium layer 30 with a thickness of 0.5-1 microns is deposited on the outer surface of the nitriding layer 20 by physical vapor deposition under the condition of 0.2 Pa; finally, a composite ceramic coating 40 with a thickness of 5-7 microns and composed of chromium nitride and carbon nitride is deposited on the outer surface of the metal chromium layer 30 by physical vapor deposition under the condition of temperature 400 DEG C, pressure 0.2 Pa and bias voltage -50 V. The screw groove surface is required to be polished before and after the hard chromium plating; the hard chromium plating equipment should control the hydrogen brittleness of the hard chromium layer and prevent cracks, and the adhesive strength and porosity should meet the requirements of GB / T11379; the thickness of the hard chromium plating layer should be 0.06-0.1 mm, and the hardness should be not less than 800HV0.1.
[0057] The first threaded section 12, the second threaded section 15, the third threaded section 16 and the fourth threaded section 17 all have screw grooves; the screw groove surfaces are plated with hard chromium layers.
[0058] Preferably, the outer circumferential sidewall of the spiral section 18 is concavely provided with a spiral groove, and the right end of the spiral section 18 is connected to the left end of the connecting section 19.
[0059] Preferably, the connecting section 19 comprises a first connecting part 191, an inclined part 192 and a second connecting part 193; the left end of the first connecting part is connected to the spiral section 18; the inclined part is obliquely arranged from the right end of the first connecting part; and the second connecting part is connected to the right end of the inclined part.
[0060] The design focus of the utility model lies in that it mainly realizes multi-section threaded mixing structure design through the design of the first threaded section, the second threaded section, the third threaded section, the fourth threaded section and the spiral section, so that the material is pushed and mixed through the multi-section threaded mixing structure, and the mixing effect and mixing degree are improved.
[0061] Secondly, the raw material mixing is more uniform through the setting of the first, second and third mixing sections, so that the product quality is improved, the structure design is ingenious and reasonable, the use requirement of the user is met, and the application range is wide.
[0062] Finally, the design of the hard chromium layer, the nitriding layer, the metal chromium layer and the composite ceramic coating improves the hardness, high corrosion resistance and low friction coefficient of the screw.
[0063] The above is only the preferable embodiment of the utility model, and does not limit the technical range of the utility model, so any slight modification, equivalent change and modification according to the technical essence of the utility model are still within the technical scheme range of the utility model.
Claims
1. A multi-stage screw for film extrusion molding, characterized by: The screw body is sequentially provided with a first mixing section, a first threaded section, a second mixing section, a third mixing section, a second threaded section, a third threaded section, a fourth threaded section, a spiral section and a connecting section from left to right. The outer periphery of the first mixing section is provided with a plurality of pins. Each group of strip-shaped mixing grooves includes an inlet strip-shaped groove and an outlet strip-shaped groove, which are arranged at the outer periphery of the corresponding second mixing section and third mixing section. The first mixing section and the first threaded section are provided with a first transition section, and the second mixing section and the first threaded section are provided with a second transition section. The outer periphery of the first threaded section has first screw ridges, the outer periphery of the second threaded section has second screw ridges, and the outer periphery of the third threaded section is provided with third screw ridges and fourth screw ridges. The surfaces of the first screw ridges, the second screw ridges, the third screw ridges and the fourth screw ridges are sequentially provided with a nitriding layer, a metal chromium layer and a composite ceramic coating from outside to inside. The first threaded section, the second threaded section, the third threaded section and the fourth threaded section all have screw grooves, and the surfaces of the screw grooves are plated with a hard chromium layer.
2. A multi-stage screw for film extrusion molding according to claim 1, wherein: The outer periphery of the spiral section is concavely provided with a spiral groove, and the right end of the spiral section is connected to the left end of the connecting section.
3. A multi-stage screw for film extrusion molding according to claim 2, wherein: The connecting section includes a first connecting part, an inclined part and a second connecting part.
4. The multi-stage screw for thin film extrusion molding according to claim 1, wherein: The bottom diameter of the first transition section is equal to that of the second transition section.
5. The multi-stage screw for thin film extrusion molding according to claim 1, wherein: The first mixing section, the first threaded section, the second mixing section, the third mixing section, the second threaded section, the third threaded section, the fourth threaded section and the spiral section all have a core column with a circular cross section.
6. A multi-sectioned screw for film extrusion molding according to claim 1, wherein: The composite ceramic coating includes a chromium nitride layer and a carbon nitride layer.
7. A multi-sectioned screw for film extrusion molding according to claim 1, wherein: A plurality of pins are arranged in a matrix on the outer periphery of the first mixing section.
8. A multi-sectioned screw for film extrusion molding according to claim 1, wherein: The thickness of the nitriding layer is greater than 0.2 mm.
9. The multi-section screw for thin film extrusion molding according to claim 1, wherein: The thickness of the metal chromium layer is 0.6-1 microns.