CN223573778U - Screw and extruder - Google Patents

Abstract

The utility model relates to the technical field of parts of extruders, in particular to a screw, and simultaneously relates to an extruder with the screw. Wherein the tooth starting position of the screw is arranged at the position 6 cm to 10cm behind the feeding section of the screw extruder. Compared with the screw with the same size, the screw has the advantages that the screw is novel, the starting position is more rear than the starting position of a common screw, the material friction and conveying effect are better, the raw material extrusion precision is improved, the phenomena of slipping of the screw and unstable pressure of a discharge hole of a machine head are reduced, compared with the screw with the same size, the depth of a screw groove is deepened, so that the screw groove can contain more materials, the friction force between the materials and the screw is increased, the material is effectively conveyed, the yield of finished extruded pipes is improved, the complex operation of manually adjusting the extrusion amount of the screw is avoided, and a chromium nitride coating is adopted for a screw coating, so that the screw has the characteristics of corrosion resistance, wear resistance, high pressure resistance and high temperature resistance, is applicable to most plastic particles, and has good universality.

Description

Screw and extruder

Technical Field

The utility model relates to the technical field of parts of extruders, in particular to a screw, and simultaneously relates to an extruder with the screw.

Background

For extruders, the usual structure consists of an extrusion system, a transmission system, a heating and cooling system, etc. The materials enter the machine barrel from the hopper, and are extruded from the machine head through the processes of heating, plasticizing, mixing and the like under the rotation pushing of the screw rod.

In the production process of the extruder, partial plastic particles with uneven particles or larger oiliness can cause slipping of a screw rod and unstable extrusion quantity, so that extruded pipes are poor in size and low in qualification rate. In order to ensure that the extrusion amount is relatively stable, the control is generally performed by manually adjusting the rotation speed of the extruder screw and the rotation speed of the tractor belt in the prior art. However, hysteresis is easy to occur in manual adjustment, the adjustment range is required to be empirically adjusted, and the problems of unstable outer diameter quality of the pipe after adjustment and low output efficiency exist. Therefore, there is a need for a production apparatus capable of improving the stability of the extrusion amount.

Disclosure of utility model

In view of the above, the utility model provides a screw rod to solve the problems of poor size and lower qualification rate of extruded pipes caused by slipping and unstable extrusion quantity of the screw rod due to partial uneven particles or large oily plastic particles in the production process of an extruder in the prior art.

The utility model provides a screw, wherein the tooth starting position of the screw is arranged at the position 6-10cm behind the feeding section of a screw extruder.

Optionally, the screw grooves of the screw are deepened by 2-5mm relative to a prior art screw of the same size in the feed section of the screw extruder.

Optionally, the screw grooves of the screw are deepened by 3mm relative to a prior art screw of the same size in the feed section of the screw extruder.

Optionally, the surface of the screw is provided with a coating which is corrosion-resistant, wear-resistant, high-pressure-resistant and high-temperature-resistant.

Optionally, the coating is a chromium nitride coating.

Optionally, the tooth starting position of the screw is arranged at the position 8cm behind the feeding section of the screw extruder.

Optionally, the screw is provided with double flights from 5 to 10 flights starting from the feed section of the screw extruder.

Optionally, the screw is provided with a double thread starting from 7 flights of the feed section.

Alternatively, the screw is an HPT1 fully hard screw.

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

1. the screw tooth starting position is more back for general screw tooth starting position, and material friction and conveying effect are better, have improved the raw materials and have extruded the precision, have reduced the phenomenon that the screw rod skidded, aircraft nose discharge gate pressure is unstable.

2. Compared with the screw rod with the same size, the screw groove depth 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 finished extruded pipe products is improved, and the complex operation of manually adjusting the extrusion amount of the screw rod is avoided.

3. The screw coating adopts a chromium nitride coating, has the characteristics of corrosion resistance, abrasion resistance, high pressure resistance and high temperature resistance, can be suitable for most plastic particles, and has better universality.

Another object of the present utility model is to provide an extruder comprising an extruder body having a driving source, wherein the extruder body is provided with the screw as described above, and the screw is in driving connection with a power output end of the driving source.

The extruder disclosed by the utility model is beneficial to improving the product quality and the production efficiency by adopting the screw rod.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of a screw structure in the prior art.

Fig. 2 is a schematic view of the structure of the novel screw in the example.

In the figure, a novel screw 1 and a screw 2 in the prior art are shown.

Detailed Description

Specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art without making any inventive effort, are intended to be within the scope of the present utility model.

Unless specifically stated or limited otherwise, the terms "disposed," "mounted," "connected," and the like should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, or directly connected, or indirectly connected via an intermediary. The specific meaning of the terms described above will be understood to those of ordinary skill in the art in a specific context.

The terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," and the like are used as references to orientations or positional relationships based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationships in which the inventive product is conventionally disposed in use, merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore are not to be construed as limiting the utility model.

The terms "first," "second," "third," and the like, are merely used for distinguishing between similar elements and not necessarily for indicating or implying a relative importance or order.

The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a list of elements does not include only those elements but may include other elements not expressly listed.

Screw extruders are a common plastic processing device, which is mainly used for heating and melting plastic particles and extruding the plastic particles through a screw to form the required plastic products. Screw extruders generally consist of a plurality of extrusion sections, each having its specific principle of action, the principle of action of each extrusion section being described below.

1. The feeding section is the open end section of the screw extruder and mainly used for feeding plastic particles into the screw spiral groove of the extruder. The infeed section is typically provided with a pair of infeed devices, such as infeed screws or infeed rollers, which function to advance the plastic particles from the infeed opening to the next extrusion section. In the feeding section, the screw has a wider and deeper helical groove to facilitate receiving and conveying the plastic pellets.

2. The compression section is an extrusion section after the feeding section and is used for melting and heating the plastic particles fed into the feeding section. In the compression section, the screw flights taper and the cross-sectional area of the circulation zone decreases, whereby the plastic particles are subjected to progressively greater mechanical shear and thermal energy for heating and melting.

3. Melting section-the melting section is an extrusion section after the compression section, which serves to further heat and melt the plastic. In the melt section, the screw axial length is relatively long and the helical groove is relatively shallow, forming a large melt zone. The main function of the melting section is to reach the melting temperature of the plastic, so that the plastic is converted from a solid state to a molten state.

4. Extrusion section-the extrusion section is one after the melting section and functions to push the molten plastic towards the die extrusion outlet by rotating the screw. In the extrusion section, the helical groove of the screw becomes progressively shallower, forming a larger extrusion zone. The primary function of the extrusion section is to pressurize and extrude the molten plastic to a die to form the desired plastic article.

5. Flighted section-flighted section is the end section following the extrusion section, which serves primarily to stop the screw rotation and to expel the residual plastic from the helical groove. The stripping section is usually provided with a stripping device, such as a stripping pin or a stripping trough, so that the screw can freely push out the plastic residues. The main function of the material returning section is to reduce the influence of residual plastics on the next processing.

Referring to fig. 2, the present utility model provides a novel screw 1, compared with a screw 2 of the prior art in which slipping occurs and the extruded material is unstable in conveying, the tooth lifting position of the novel screw 1 is located 6-10cm, preferably 8cm, behind the feeding section of the screw extruder, and the design makes the material friction and conveying effect better, and the rear direction is the direction of the screw away from the extrusion outlet of the die head.

According to the novel screw 1, the screw tooth starting position is closer to the screw tooth starting position of the screw 2 in the prior art, so that the material friction and conveying effect is better, the raw material extrusion precision is improved, and the phenomena of screw slipping and unstable pressure of a machine head discharge hole are reduced.

Furthermore, the novel screw 1 is provided with a corrosion-resistant, wear-resistant, high-pressure-resistant and high-temperature-resistant coating, preferably a chromium nitride coating, and the special functional coating on the surface of the screw can reduce the adsorption of oily materials on the surface of the screw, so that plastic particles uniformly pass through the screw, the stability of extrusion quantity is improved, and the problems of screw slipping, unstable extruded material conveying and unstable extrusion quantity existing at present can be effectively solved.

Furthermore, the novel screw 1 is made of German import HPT1 full hard material, has the hardness of HRC60 degrees, is suitable for extrusion production of adding glass fiber plastic raw materials containing 25% -65%, and has the performances of wear resistance, corrosion resistance, high temperature resistance, high pressure resistance and high speed resistance.

Further, the design enables the screw channel and the feeding section to accommodate more material, increases the friction between the material and the screw, and thus more efficiently conveys the material, by deepening the screw channel of the new screw 2 to 2-5mm, preferably 3mm, relative to the prior art screw 2 of the same size, at least in the feeding section of the screw extruder. The screw grooves of the screw can be deepened in other extrusion sections of the screw extruder, not limited to the feeding section.

Further, the novel screw 1 is provided with a double thread from 5 to 10 flights starting from the feed section of the screw extruder, preferably 7 flights. The double threads help the screw channel and the feed section to accommodate more material, thereby increasing friction between the materials.

To sum up, the novel screw 1 has the following beneficial effects:

The extrusion device has the advantages of improving the extrusion precision of raw materials, reducing the phenomena of screw slipping and unstable pressure of a discharge hole of a machine head, improving the qualification rate of extruded pipe products, avoiding complex operation of manually adjusting the extrusion quantity of the screw, along with corrosion resistance, abrasion resistance, high pressure resistance and high temperature resistance of the screw, being applicable to most plastic particles and having better universality.

In addition, the embodiment also relates to an extruder, which comprises an extruder main body with a driving source, wherein the novel screw 1 is arranged on the extruder main body, and the connecting part of the novel screw 1 is in transmission connection with the power output end of the driving source.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present utility model should be included in the present utility model.

Claims (5)

1. A screw is characterized in that the tooth starting position of the screw is arranged at the position 6-10cm behind the feeding section of a screw extruder, a chromium nitride coating is arranged on the surface of the screw, and double threads are arranged on the screw from 5-10 teeth of the feeding section of the screw extruder.

2. The screw according to claim 1, wherein the starting position of the screw is located 8cm after the feeding section of the screw extruder.

3. Screw according to claim 1, characterized in that the screw is provided with a double flight starting from 7 flights of the feed section of the screw extruder.

4. A screw according to any one of claims 1 to 3, wherein the screw is an HPT1 fully hard screw.

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