Ultra-long conical double-screw machine barrel assembly

Abstract

The utility model provides a super-long conical double-screw machine barrel assembly, which belongs to the technical field of screws and comprises a machine barrel and screws arranged in the machine barrel, one end of the machine barrel is fixed through a flange ring, a feeding port is arranged on the side wall of one end of the machine barrel, and an exhaust port is arranged on the upper side wall of the machine barrel. According to the utility model, the working pressure of the inner cavity of the machine barrel is higher when the conical screw rod with a smaller taper angle works, so that the working efficiency of the plastic extruder can be improved, and the working pressure of the inner cavity of the machine barrel can be accurately adjusted through the rotating speed of the screw rod, so that the quality of products processed by the plastic extruder is improved; meanwhile, through the multiple mixing sections, the multiple compression sections and the multiple exhaust sections, the existing time of the materials in the machine barrel is prolonged, the compression sections are arranged to help the materials extrude internal gas to prevent the materials from overflowing, meanwhile, the exhaust sections discharge the extruded gas, and therefore the materials are mixed more sufficiently, and the subsequent product quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to screw technology field, specifically, relate to a kind of super-long conical double screw barrel assembly. BACKGROUND

[0002] Conical double screw extruder is a kind of high-efficiency mixing, extruding equipment, with plasticizing mixing uniform, high yield, quality stability, wide range of adaptation, long service life, PVC powder direct forming and other characteristics. With corresponding forming machine head mould and auxiliary machine, various thermoplastic plastics, especially hard polyvinyl chloride powder, can be directly extruded into plastic products such as pipe, plate, sheet, rod, film and profiled material, and the modification of various plastics and powder granulation process can also be completed.

[0003] In the prior art, the size head ratio and the cone angle of the common conical screw on the market are relatively large. The large size head ratio makes the overall screw shorter, and the low conveying length inside the barrel affects the mixing effect of the material. Meanwhile, the large cone angle has high sensitivity to the pressure inside the barrel, and slight adjustment of the rotation speed can cause large changes in the pressure, affecting the quality of the subsequent processed products. Therefore, how to invent a super-long conical double screw barrel assembly to solve these problems has become a problem to be solved by the technical personnel in the field. CONTENT OF THE UTILITY MODEL

[0004] In order to make up for the above shortcomings, the utility model provides a kind of super-long conical double screw barrel assembly, to solve the size head ratio and the cone angle of the common conical screw on the market are relatively large and the quality of the processed product is low after processing.

[0005] The utility model is implemented as follows: the utility model provides a kind of super-long conical double screw barrel assembly, including machine barrel and two screws rotationally arranged in the machine barrel, the cavity capable of accommodating two screws is arranged in the machine barrel, the top of the machine barrel is equipped with the feeding port for adding material, the end of the machine barrel is equipped with the discharge port for discharging material, two the screws are staggered, two the screws are small conical screws, the diameter gradually reduces from the end close to the feeding port to the discharge port direction, the diameter of the screw end close to the feeding port is D1, the diameter of the end far from the feeding port is D2, the length of the screw is L, the cone angle of the screw is α, tan α=(D1-D2) / 2 / L, tan α is 0.001-0.009, the length-diameter ratio of the screw is A, A=L / D2, A is 30-40.

[0006] Preferably, two the screws include feeding section, pre-plasticizing section, first mixing section, first compression section, first exhaust section, second mixing section, second compression section, second exhaust section and extrusion section in turn along the direction of material conveying.

[0007] Preferably, a plurality of first shearing teeth of a tooth type are fixed on the first mixing section, and the first shearing teeth on the two screws are interlocked.

[0008] Preferably, a sixth screw, second shearing teeth of a tooth type, a seventh screw and an eighth screw are sequentially fixed on the second mixing section, and the second shearing teeth on the two screws are interlocked.

[0009] Preferably, the conveying section comprises a first screw, the pre-plasticizing section comprises a second screw and a third screw, the first compression section comprises a fourth screw, the first exhaust section comprises a fifth screw, the second compression section comprises a ninth screw, the second exhaust section comprises a tenth screw, and the extruding section comprises an eleventh screw and a twelfth screw.

[0010] Preferably, the barrel is provided with exhaust ports at the first exhaust section and the second exhaust section.

[0011] Preferably, irregularly arranged turbulence protrusions are formed on the inner surface of the barrel at the first exhaust section and the second exhaust section.

[0012] Preferably, the turbulence protrusions are sawtooth-shaped.

[0013] The screw of the present application is a small taper super-long diameter screw, and the advantages are as follows:

[0014] (1) Compared with a parallel double screw barrel, the working pressure of the inner cavity of the conical double screw barrel is higher, which can significantly improve the working efficiency of the plastic extruder. The ordinary conical double screw barrel has a relatively large taper angle, and the screw speed is sensitive to the pressure of the inner cavity of the barrel. The small taper of the present application has the characteristics that the sensitivity of the screw speed to the pressure of the inner cavity of the barrel is relatively low, which is more conducive to accurately adjusting the working pressure of the inner cavity of the barrel by adjusting the speed of the screw, and the range of speed adjustment is relatively large. According to the performance of the raw materials, different speeds can be set to process different extruded products, and the types of raw materials can be more diversified. At the same time, since the working pressure of the inner cavity of the barrel can be accurately adjusted, it is beneficial to improve the quality of the products processed by the plastic extruder.

[0015] The super-long diameter prolongs the working length of the screw in the barrel, optimizes the component structure, and mixes more fully. Since the screw stroke is lengthened, more mixing zones can be arranged. In the processing of PET and calcium powder mixture products, a large amount of air is mixed. In order to reduce the content of air in the product, the exhaust section can be reasonably arranged in the lengthened barrel. The present application can timely exhaust gas by setting two exhaust sections, so that the raw materials are mixed more fully, and the extrusion is smoother. Because the gas occupies a certain space, it affects the full mixing of the materials.

[0016] (2) The first mixing section is provided with multiple shearing teeth, the rotation meshing between the multiple shearing teeth improves the frequency and intensity of shearing, when the material passes through the toothed area, the material will be subjected to more direction and higher frequency shearing force, the repeated shearing action can further crush and disperse different components in the material, so that the material is mixed more uniformly, the sixth screw ridge, the second shearing tooth in the tooth shape, the seventh screw ridge and the eighth screw ridge are sequentially fixed on the second mixing section, the second shearing teeth on the two screw rods are meshed with each other, the combination of the screw ridge and the second shearing tooth is used, so that the overturning at various angles is realized, and the mixing is more sufficient.

[0017] (3) The compression section is arranged to make the material more dense to discharge air in the material, which is helpful for better dispersion of the material and better mixing, and the exhaust section is arranged to discharge water vapor in the material and air entrained in the raw material under vacuum and normal pressure, so that the space in the barrel is avoided by the gas, the gap between the materials is reduced, and the mixing effect of the materials is improved, and the quality of the subsequent product is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0019] Figure 1 is a schematic structural view of a super-long conical double-screw barrel assembly provided by the embodiments of the present application;

[0020] Figure 2 is a half sectional view of a super-long conical double-screw barrel assembly provided by the embodiments of the present application;

[0021] Figure 3 is a super-long conical double-screw barrel assembly provided by the embodiments of the present application Figure 2 is an enlarged view of the A area structure in the middle of the super-long conical double-screw barrel assembly;

[0022] Figure 4 is a schematic structural view of a screw rod in the super-long conical double-screw barrel assembly provided by the embodiments of the present application;

[0023] Figure 5 is a sectional view of a mixing section in the super-long conical double-screw barrel assembly provided by the embodiments of the present application;

[0024] Figure 6It is a kind of exhaust section cross section schematic diagram of the super-long conical double screw barrel assembly provided by the utility model embodiment.

[0025] In the drawing: 1, barrel;11, feeding port;12, exhaust port;2, screw;3, feeding section;31, first screw rib;4, pre-plasticizing section;41, second screw rib;42, third screw rib;5, first mixing section;51, first shear tooth;6, first compression section;61, fourth screw rib;7, first exhaust section;71, fifth screw rib;72, turbulence protrusion;8, second mixing section;81, sixth screw rib;82, second shear tooth;83, seventh screw rib;84, eighth screw rib;9, second compression section;91, ninth screw rib;10, second exhaust section;101, tenth screw rib;13, extrusion section;131, eleventh screw rib;132, twelfth screw rib. DETAILED DESCRIPTION

[0026] To make the purpose, technical scheme and advantages of the utility model embodiment clearer, the technical scheme in the utility model embodiment will be described clearly and completely in conjunction with the drawings in the utility model embodiment below. Obviously, the described embodiment is part of the embodiment of the utility model, instead of all the embodiments. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without creative labor fall within the protection scope of the utility model.

[0027] In the embodiment, such as Figures 1-6 A super-long conical double screw barrel assembly includes a barrel 1 and two screws 2 rotatingly arranged in the barrel 1. The barrel 1 is provided with a cavity capable of accommodating the two screws 2. The top of the barrel 1 is provided with a feeding port 11 for feeding materials. The end of the barrel 1 is provided with a discharge port for discharging materials. The two screws 2 are staggered. The two screws 2 are small conical screws, the diameter of which gradually decreases from the end close to the feeding port 11 to the discharge port. The diameter of the end close to the feeding port 11 is D1, and the diameter of the end away from the feeding port 11 is D2. The length of the screw 2 is L. The taper angle of the screw 2 is α, tan α = (D1-D2) / 2 / L, tan α is 0.001-0.009. The length-diameter ratio of the screw 2 is A, A = L / D2, A is 30-40.

[0028] It should be noted that: ordinary conical twin screw, its conical screw is generally designed according to the size of the head diameter 2:1 ratio, the length-diameter ratio A is in the range of 20-23, for example, the diameter 65 / 132 conical twin screw barrel which is used in the market in a larger amount, the effective length of the screw is 1420mm, the large head diameter is 132mm, the small head diameter is 65mm, the length-diameter ratio is 1420 / 65 about equal to 22 times, tanα=(132-65) / 2 / 1420=0.0236. While the size of the first screw 29 and the second screw 210 of the present application can be made to be diameter 145 / 192, the length reaches 5588mm, the large head diameter is 192mm, the small head diameter is 145mm, the length-diameter ratio 5588 / 145 is more than 38 times, tanα=(192-145) / 2 / 5588≈0.0042, from the above data, the screw 2 of the utility model is a small taper super length-diameter screw, and its advantages are as follows:

[0029] First small taper: compared with parallel twin screw barrel, the working pressure of the inner cavity of the conical twin screw barrel 1 is higher, which can significantly improve the working efficiency of the plastic extruder. The ordinary conical twin screw barrel has a relatively large taper angle, and the high and low speed of the screw 2 is sensitive to the pressure in the inner cavity of the barrel. While the small taper of the present application, the high and low speed of the screw is relatively low to the sensitivity of the pressure in the inner cavity of the barrel 1, which is more conducive to accurately adjusting the working pressure of the inner cavity of the barrel 1 by adjusting the speed of the screw, and the range of speed adjustment is relatively larger. According to the performance of the raw material, different speeds can be set to process different extrusion products, and the types of raw materials can be more diversified. At the same time, since the working pressure of the inner cavity of the barrel 1 can be accurately adjusted, it is beneficial to improve the quality of the products processed by the plastic extruder.

[0030] Second super length-diameter: the working length of the screw 2 in the barrel 1 is prolonged, the component structure is optimized, and the mixing is more sufficient. Because the stroke of the screw 2 is lengthened, more mixing zones can be arranged. In the process of processing PET and calcium powder mixed material products, a large amount of air will be mixed. In order to reduce the content of air in the product, the exhaust section can be reasonably arranged in the lengthened barrel 1. The present application can timely exhaust gas by setting two exhaust sections, so that the raw material mixing is more sufficient, and the extrusion is more smooth. Because the gas will occupy a certain space, it will affect the full mixing of the material.

[0031] Further; two said screws 2 include feeding section 3, pre-plasticizing section 4, first mixing section 5, first compression section 6, first exhaust section 7, second mixing section 8, second compression section 9, second exhaust section 10 and extrusion section 13 in turn along the direction of material conveying. A plurality of tooth-shaped first shear teeth 51 are fixed on the first mixing section 5, and the first shear teeth 51 on the two said screws 2 are interlocked;

[0032] It needs to be explained that the rotation meshing between the first shear teeth 51 can improve the frequency and intensity of shearing, and when the material passes through the tooth meshing area, it will be subjected to more direction and higher frequency shearing force, and this repeated shearing action can further break and disperse different components in the material, so that the mixing of the materials is more uniform.

[0033] Further, the sixth screw rib 81, the tooth-shaped second shear tooth 82, the seventh screw rib 83 and the eighth screw rib 84 are sequentially fixed on the second mixing section 8, and the second shear teeth 82 on the two screw rods 2 are meshed with each other;

[0034] It needs to be explained that the combination of screw ribs and second shear teeth 82 can realize overturning at various angles, so that the mixing is more sufficient.

[0035] Further, the first screw rib 31 is arranged on the feeding section 3, the second screw rib 41 and the third screw rib 42 are arranged on the pre-plasticizing section 4, the fourth screw rib 61 is arranged on the first compression section 6, the fifth screw rib 71 is arranged on the first exhaust section 7, the ninth screw rib 91 is arranged on the second compression section 9, the tenth screw rib 101 is arranged on the second exhaust section 10, and the eleventh screw rib 131 and the twelfth screw rib 132 are arranged on the extrusion section 13;

[0036] It needs to be explained that the two compression sections are arranged to compact the relatively loose material after mixing, the compression sections apply pressure to the material through the action between the screw ribs, so that the material is more dense to discharge the air in the material, and in the compression process of the material, the material can be subjected to higher pressure and shearing force, which helps the material to be better dispersed so that it can be better mixed. When the material is sent to the two exhaust sections, the water vapor in the material and the air entrained in the raw material can be discharged under vacuum and normal pressure, and the screw ribs of the exhaust sections have relatively large distribution gaps. The large gap can provide enough escape space and channel for the gas, so that the gas can be smoothly separated from the material, ensuring that the mixing process can be safely and smoothly carried out.

[0037] Further, the exhaust port 12 is arranged on the barrel 1 at the first exhaust section 7 and the second exhaust section 10, and the irregularly arranged turbulence protrusions 72 are formed on the inside of the barrel 1 at the first exhaust section 7 and the second exhaust section 10, and the turbulence protrusions 72 are sawtooth-shaped.

[0038] It needs to be explained that the irregular turbulence protrusions 72 can disrupt the original flow path of the material, and constantly changing the flow direction and speed can effectively destroy the laminar flow state of the material, generate turbulence, so that the gas is more easily separated from the material. At the same time, the sawtooth structure can shear the bubbles to make them break, so that the gas is more easily separated from the material.

[0039] The working principle of the super-long conical double-screw barrel assembly is as follows:

[0040] The material is put into the barrel 1 through the feeding port 11, first enters the pre-plasticizing section 4 through the feeding section 3, is preliminarily heated and softened by spiral stirring, the solid material is changed into a molten state, the molten material enters the first mixing section 5, is mixed and sheared by the tooth-shaped mixing mode, is fully mixed, then is compacted by the first compression section 6 to extrude the gas between the materials, the subsequent material is discharged through the exhaust port 12 after passing through the first exhaust section 7, the material after discharging the gas is mixed, compressed and exhausted again by the second mixing section 8, the second compression section 9 and the second exhaust section 10, the material is fully mixed, is conveyed and pressurized while being further mixed by the extruding section 13, and finally is extruded by the twelfth screw edge 132 to complete the discharging.

[0041] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An ultra-long conical twin-screw barrel assembly, comprising a barrel (1) and two screws (2) rotatably disposed in the barrel (1), wherein a cavity capable of accommodating the two screws (2) is provided in the barrel (1), a feeding port (11) for adding material is provided at the top of the barrel (1), and a discharge port for discharging material is provided at the end of the barrel (1), characterized in that: The two screws (2) are staggered and arranged. The two screws (2) are small conical screws, and their diameters gradually decrease from the end close to the feeding port (11) toward the discharge port. The diameter of the end of the screw (2) close to the feeding port (11) is D1, and the diameter of the end of the screw (2) away from the feeding port (11) is D2. The length of the screw (2) is L, the cone angle of the screw (2) is α, tanα=(D1-D2) / 2 / L, tanα is 0.001-0.009, and the aspect ratio of the screw (2) is A, A=L / D2, and A is 30-40.

2. The ultra-long conical twin-screw barrel assembly according to claim 1, characterized in that: The two screws (2) sequentially comprise a feeding section (3), a pre-plasticizing section (4), a first mixing section (5), a first compression section (6), a first exhaust section (7), a second mixing section (8), a second compression section (9), a second exhaust section (10) and an extrusion section (13) along the direction of material conveying.

3. The ultra-long conical twin-screw barrel assembly according to claim 2, characterized in that: A plurality of tooth-shaped first shearing teeth (51) are fixed on the first mixing section (5), and the first shearing teeth (51) on the two screw rods (2) are meshed with each other.

4. The ultra-long conical twin-screw barrel assembly according to claim 2, characterized in that: The second mixing section (8) is fixed with a sixth screw ridge (81), a tooth-shaped second shearing tooth (82), a seventh screw ridge (83) and an eighth screw ridge (84) in sequence, and the second shearing teeth (82) on the two screw rods (2) are meshed with each other.

5. The ultra-long conical twin-screw barrel assembly according to claim 2, characterized in that: The feeding section (3) includes a first screw flight (31), the pre-plasticizing section (4) includes a second screw flight (41) and a third screw flight (42), the first compression section (6) includes a fourth screw flight (61), the first exhaust section (7) includes a fifth screw flight (71), the second compression section (9) includes a ninth screw flight (91), the second exhaust section (10) includes a tenth screw flight (101), and the extrusion section (13) includes an eleventh screw flight (131) and a twelfth screw flight (132).

6. The ultra-long conical twin-screw barrel assembly according to claim 5, characterized in that: Exhaust ports (12) are provided on the barrel (1) at the first exhaust section (7) and the second exhaust section (10).

7. The ultra-long conical twin-screw barrel assembly according to claim 6, characterized in that: Irregularly arranged flow-turbulating protrusions (72) are formed on the interior of the barrel (1) at the first exhaust section (7) and the second exhaust section (10).

8. The ultra-long conical twin-screw barrel assembly according to claim 7, characterized in that: The spoiler protrusion (72) is sawtooth-shaped.

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