Screw and extruder

Abstract

The utility model relates to the technical field of parts of extruders, in particular to a screw rod and an extruder with the screw rod. Wherein the tooth starting position of the screw is arranged at a position 6-10cm behind a feeding section of the screw extruder. Compared with the prior art, the screw rod is a novel screw rod, and the novel screw rod has the advantages that the tooth forming position is closer to the rear compared with the tooth forming position of a common screw rod, the material friction and conveying effect is better, the raw material extrusion precision is improved, and the phenomena that the screw rod slips and the pressure of a discharge port of a machine head is unstable are reduced; compared with a screw rod with the same size, the depth of the screw groove is deepened, so that the screw groove can contain more materials, the friction force between the materials and the screw rod is increased, the materials are effectively conveyed, the qualified rate of extruded pipe finished products is improved, and the complex operation of manually adjusting the extrusion amount of the screw rod is avoided; and the coating of the screw rod adopts a chromium nitride coating, has the characteristics of corrosion resistance, wear resistance, high pressure resistance and high temperature resistance, can be suitable for most plastic particles, and has better universality.

Description

TECHNICAL FIELD

[0001] The utility model relates to extruder parts technical field, especially a kind of screw, and further more, a kind of extruder with the screw. BACKGROUND

[0002] For extruder, the usual structure is by extrusion system, transmission system, heating cooling system etc. Material is from hopper into cylinder, under the rotation of screw, after heating, plasticizing, mixing etc. Process, from head extrusion.

[0003] In the production process of extruder, part of particle uneven or oilier plastic particles can cause screw slip, extrusion quantity instability, so as to cause the size of extruded pipe material is poor, and the qualified rate is lower. In order to ensure that the extrusion quantity is relatively stable, the existing technology usually controls by manually adjusting the speed of extruder screw and traction machine belt. However, manual adjustment is prone to hysteresis, and the size of adjustment range needs experience, and there are problems of unstable pipe diameter quality and low output efficiency after adjustment. Therefore, a kind of production equipment capable of improving the stability of extrusion quantity is needed. SUMMARY

[0004] Therefore, the utility model provides a kind of screw to solve the problem that part of particle uneven or oilier plastic particles can cause screw slip, extrusion quantity instability, so as to cause the size of extruded pipe material is poor, and the qualified rate is lower in the production process of extruder of prior art.

[0005] The utility model provides a kind of screw, the tooth position of the screw is located at 6-10cm after the feeding section of screw extruder.

[0006] Optionally, in the feeding section of screw extruder, the screw groove of the screw is deepened by 2-5mm relative to the same size prior art screw.

[0007] Optionally, in the feeding section of screw extruder, the screw groove of the screw is deepened by 3mm relative to the same size prior art screw.

[0008] Optionally, the surface of the screw is provided with corrosion-resistant, wear-resistant, high-pressure-resistant and high-temperature-resistant coating.

[0009] Optionally, the coating is chromium nitride coating.

[0010] Optionally, the tooth position of the screw is located at 8cm after the feeding section of screw extruder.

[0011] Optionally, the screw is provided with double thread from 5-10 teeth of the feeding section of screw extruder.

[0012] Optionally, the screw thread is provided with double thread from the 7th thread of the feeding section.

[0013] Optionally, the screw is HPT1 full-hard screw.

[0014] Compared with the prior art, the technical scheme of the utility model has the following advantages:

[0015] 1. The thread starting position of the screw is more rearward than that of a general screw, the material friction and conveying effect are better, the raw material extrusion precision is improved, and the phenomena of screw slipping and unstable material outlet pressure of the machine head are reduced.

[0016] 2. Compared with a screw of the same size, the screw groove depth is deepened, the screw groove can accommodate more material, the friction between the material and the screw is increased, the material is effectively conveyed, the extrusion pipe product qualification rate is improved, and the complex operation of manually adjusting the extrusion amount of the screw is avoided.

[0017] 3. The screw coating is a chromium nitride coating, has the characteristics of corrosion resistance, wear resistance, high pressure resistance and high temperature resistance, can be suitable for most plastic particles, and has good universality.

[0018] Another purpose of the utility model is to provide an extruder, which comprises an extruder body with a driving source, wherein the extruder body is provided with the screw as described above, and the screw is in transmission connection with the power output end of the driving source.

[0019] The extruder disclosed by the utility model has the screw as described above, and is beneficial to improving product quality and production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, 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 utility model, and should not be regarded as limiting the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of the drawings.

[0021] Figure 1 It is a schematic view of the screw structure in the prior art.

[0022] Figure 2 It is a schematic view of the novel screw structure in the embodiment.

[0023] In the drawing: novel screw 1, prior art screw 2. DETAILED DESCRIPTION

[0024] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the description of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0025] Unless otherwise explicitly specified and limited, the terms "arranged", "mounted", "connected" and the like should be interpreted in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0026] The terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, and are only for the convenience of description and simplification of description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0027] The terms "first", "second", "third" and the like are only for distinguishing similar attributes of elements, and do not indicate or imply relative importance or a particular order.

[0028] The terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, in addition to including the listed elements, other elements not explicitly listed can also be included.

[0029] A screw extruder is a common plastic processing equipment, mainly used for heating and melting plastic particles through screw extrusion to form the required plastic products. The screw extruder is usually composed of multiple extrusion sections, each extrusion section has its specific principle of action, the principle of action of each extrusion section is described below.

[0030] 1. Feeding section: The feeding section is the beginning section of the screw extruder, and its main function is to feed the plastic particles into the screw groove of the extruder. The feeding section is usually equipped with a pair of feeding devices, such as a feeding screw or a feeding roller, which functions to push the plastic particles from the feeding port to the next extrusion section. In the feeding section, the screw groove of the screw is relatively wide and deep, so as to facilitate the reception and transmission of plastic particles.

[0031] 2. Compression section: The compression section is an extrusion section after the feeding section, which functions to melt and heat the plastic particles fed in the feeding section. In the compression section, the helical groove of the screw gradually narrows, and the cross-sectional area of the circulation zone gradually decreases, so that the plastic particles gradually receive greater mechanical shear force and thermal energy for heating and melting.

[0032] 3. Melting section: The melting section is an extrusion section after the compression section, which functions to further heat and melt the plastic. In the melting section, the axial length of the screw is relatively long, and the helical groove is relatively shallow, forming a larger melting zone. The main function of the melting section is to reach the melting temperature of the plastic, so that the plastic changes from solid to molten state.

[0033] 4. Extrusion section: The extrusion section is an extrusion section after the melting section, which functions to push the molten plastic to the die extrusion port through the rotating screw. In the extrusion section, the helical groove of the screw gradually becomes shallower, forming a larger extrusion zone. The main function of the extrusion section is to pressurize and extrude the molten plastic to the die to form the required plastic product.

[0034] 5. Material return section: The material return section is the terminal section after the extrusion section, which mainly functions to stop the rotation of the screw and discharge the residual plastic from the helical groove. The material return section is usually equipped with a material return device, such as a material return pin or a material return groove, so that the screw can freely push out the plastic residues. The main function of the material return section is to reduce the impact of residual plastic on the next processing.

[0035] Please refer to Figure 2 The utility model provides a novel screw 1, compared with prior art screw 2 that appears to slip, the material conveying of extrusion is unstable, the tooth position of novel screw 1 is more rear, the tooth position of novel screw 1 is located at the place of 6-10cm after the feeding section of screw extruder, preferably 8cm, this design makes the material friction and conveying effect better, improve the raw material extrusion precision, reduce the phenomenon of screw slipping, head discharge port pressure instability.

[0036] The utility model discloses a novel screw 1, the tooth position of screw is more rear relative to the tooth position of general prior art screw 2, the material friction and conveying effect are better, improve the raw material extrusion precision, reduce the phenomenon of screw slipping, head discharge port pressure instability.

[0037] Further, the surface of the novel screw 1 has a corrosion-resistant, wear-resistant, high-pressure-resistant and high-temperature-resistant coating, preferably a chromium nitride coating. The special functional coating on the surface of the screw can reduce the adsorption of oily materials on the surface of the screw, make the plastic particles pass through the screw uniformly, improve the stability of the extrusion amount, and effectively solve the problems of screw slipping, unstable material conveying during extrusion, and unstable extrusion amount.

[0038] Further, the new screw 1 is made of HPT1 full-hard material imported from Germany, with hardness of HRC 60°, and is suitable for extrusion production of plastic materials containing 25%-65% glass fiber, and has the properties of wear resistance, corrosion resistance, high temperature resistance, high pressure resistance and high speed resistance.

[0039] Further, compared with the same size screw 2 of the prior art, the screw channel of the new screw is deepened by 2-5mm, preferably 3mm, at least in the feeding section of the screw extruder, which can make the screw channel and the feeding section accommodate more materials, increase the friction between the materials and the screw, and thus more effectively transport the materials.

[0040] Further, the new screw 1 is provided with double threads from the 5th to 10th tooth of the feeding section of the screw extruder, preferably from the 7th tooth.

[0041] In summary, the new screw 1 has the following beneficial effects:

[0042] The extrusion precision of the raw materials is improved, the screw slipping and the unstable pressure at the material outlet of the head are reduced, the qualified rate of the extruded pipe products is improved, and the complex operation of manually adjusting the extrusion amount of the screw is avoided.

[0043] In addition, the embodiment also relates to an extruder, which comprises an extruder body with a driving source, and the new screw 1 described above is arranged on the extruder body, and the connecting part of the new screw 1 is in transmission connection with the power output end of the driving source.

[0044] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A screw characterized in that, The start position of the screw thread is set at 6-10 cm behind the feeding section of the screw extruder; the surface of the screw is coated with chromium nitride; and the screw is provided with double threads from the 5th-10th thread from the feeding section of the screw extruder.

2. The screw of claim 1, wherein The start position of the screw thread is set at 8 cm behind the feeding section of the screw extruder.

3. The screw of claim 1 wherein, The screw is provided with double threads from the 7th thread from the feeding section of the screw extruder.

4. The screw of any one of claims 1 to 3, wherein The screw is an HPT1 full-hard screw.

5. An extruder comprising an extruder body having a drive source, characterized by The extruder body is provided with the screw as claimed in any one of claims 1 to 4, and the screw is in driving connection with the power output end of the driving source.

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