CN204183868U - A kind of assembled screw rod for the production of PA6 fibre modification material - Google Patents

Abstract

The utility model discloses a combined screw used for producing PA6 fiber modified materials. The screw is applied in an engineering plastic granulator and comprises a mandrel and a threaded element sleeved on the mandrel. The threaded element is divided into Conveying parts for conveying materials or meshing blocks for dispersing materials, the screw is divided into feeding section, melting section, exhausting section, dispersing section and discharging section in turn.

Description

A combined screw for producing PA6 fiber modified material

technical field

The utility model relates to the technical field of extrusion screws, in particular to a combined screw used for producing PA6 fiber modified materials.

Background technique

The screw is an important part of the plastic granulator. Its working mechanism is to rely on the pressure and shear force generated by the rotation of the screw, so that the material can be fully plasticized and evenly mixed. The commonly used screw has a combined screw. The combined screw is formed by using a number of threaded elements to be sleeved on the mandrel. The commonly used threaded elements of the combined screw include a conveying block and an engaging block. The screw can have different effects by forming different arrangements and combinations of conveying blocks and meshing blocks of different specifications on the mandrel of the screw, so that different screws can be combined for different materials to make it suitable for the production of the material.

Contents of the invention

The purpose of this utility model is to provide a combined screw for producing PA6 fiber modified material that can make the produced PA6 fiber modified material have good quality according to the characteristics of PA6 fiber modified material and the requirements of production technology.

In order to achieve the above objectives, the technical solution adopted by the utility model is: a combined screw used to produce PA6 fiber modified materials, which is used in engineering plastic granulators, including a mandrel and a screw sleeved on the mandrel. The screw element is divided into conveying parts for conveying materials or meshing blocks for dispersing materials, and the screw is divided into feeding section, melting section, exhaust section, dispersing section, and discharging section in sequence. The feeding section is composed of several conveying blocks, wherein the lead of the conveying block before the feed port of the engineering plastic granulator barrel presents an increasing trend, and the lead of the conveying block after the feed port presents a decreasing trend; The section includes several meshing areas, each meshing area contains two meshing blocks and each meshing area is separated by a conveying block, wherein the last meshing area includes at least one meshing block with a stagger angle of 90 ^° and the last section of the segment The threaded element is a reverse thread conveying block; the exhaust section is composed of several conveying blocks and its initial conveying block is located below the exhaust port of the barrel of the engineering plastic granulator, and the lead of the conveying block is in a decreasing trend; The dispersing section includes several meshing areas containing two meshing blocks, each meshing area is separated by a conveying block, the penultimate threaded element of this section is the meshing block with a staggered angle of 90 ^° , and the last threaded element is The reverse thread conveying block is located below the vacuum port of the barrel of the engineering plastic granulator, and there is a separate engaging block in the middle of this section, and there is a conveying block between the separate engaging block and the adjacent engaging area ; The discharge section is composed of several conveying blocks and its initial threaded element is located below the vacuum port, and the lead of the conveying block shows a decreasing trend.

Furthermore, at least one of the conveying blocks located below the feed inlet in the feeding section is an SK-type conveying block.

Further, the stagger angle of the meshing blocks in the melting section and the dispersing section is at least 45 ^° .

The beneficial effects of the utility model are: adopting a combined screw used in the production of PA6 fiber modified materials provided by the utility model adopts a meshing area with a small shear force in the dispersing section, so as to avoid affecting PA6 due to excessive shear force. Improve the quality of fiber-modified materials and reduce energy consumption during production.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a schematic diagram of the position of the utility model in the engineering plastic granulator.

Fig. 3 is a schematic perspective view of the three-dimensional structure of the conveying block.

Figure 4 is a side view of the delivery block.

Fig. 5 is a schematic diagram of a sheared three-dimensional structure.

Fig. 6 is a top view of the engaging block.

Fig. 7 is a schematic perspective view of the three-dimensional structure of the SK type conveying block.

Among them, 1 is the feeding section, 2 is the melting section, 3 is the exhaust section, 4 is the dispersion section, 5 is the discharge section, 6 is the feeding port, 7 is the exhaust port, and 8 is the vacuum port.

Detailed ways

The technical solution claimed by the utility model will be further described in detail in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1 and 2, the utility model is applied to an engineering plastic granulator with nine sections of material barrel, wherein the first section of material barrel has a feed port 6, and the fourth section of material barrel has an exhaust port 7 , the seventh section of the barrel is a vacuum port 8, the length of all barrels is 240mm.

As shown in Figure 3 and Figure 4, the conveying block has a thread and the rotation of the screw drives the material to advance along the thread to achieve the effect of conveying the material; as shown in Figure 5 and Figure 6, the meshing block generally consists of several meshing discs with the same shape. The number of meshing disks in the attached drawing is 5, and the angle a formed by the interlacing between two adjacent meshing disks is called the staggered angle. The larger it is; as shown in Figure 7, it is a SK-type conveying block. The thread groove of the SK-type conveying block is right-angled, which can accommodate more materials than ordinary conveying blocks.

The combined screw can be divided into feeding section 1, melting section 2, exhaust section 3, dispersion section 4, and discharge section 5 according to the flow direction of the material. In this embodiment, the feeding section 1 is composed of the following screw elements in sequence: a conveying block with a lead of 48mm and a length of 48mm, a conveying block with a lead of 64mm and a length of 64mm, a SK-type conveying block with a lead of 72mm and a length of 72mm, and a lead of 72mm. 72mm conveying block with a length of 72mm, a conveying block with a lead of 64mm and a length of 64mm, two conveying blocks with a lead of 48mm and a length of 48mm, and a conveying block with a lead of 32mm and a length of 32mm. The function of the feeding section 1 is to make the material enter the screw smoothly. The screw element with a large lead is used under the feeding port 6 to avoid the accumulation of materials at the position of the feeding port 6. The SK type conveying block can accommodate more materials. , can further avoid material accumulation; the lead of the conveying block shows a decreasing trend after the feed port 6, so that the material can obtain enough pressure at the end of the segment to promote the material to enter the melting segment 2 smoothly.

Melting section 2 is composed of the following thread elements in sequence: two engaging blocks with a length ^of 48mm, a staggered angle of 45 ^O , and a number of engaging discs of 5; The number of engaging blocks is 5, the length is 32mm, the stagger angle is 60 ^O , the number of engaging discs is 4, the lead is 32 mm, the length is 32 mm, the length is 32 mm, the staggering angle is 60 ^O , the number of engaging discs is 4, An engaging block with a length of 48mm, a stagger angle of 90 ^O , and the number of engaging discs is 5, and a reverse thread conveying block with a lead of 32mm and a length of 16mm. The role of the melting section 2 is to melt and mix the materials in this section. The staggered angles of the meshing blocks in this section are all at 45 ^° or above. The shear stress is relatively strong, and the meshing area composed of two meshing blocks is different from the traditional dispersed arrangement. Compared with the method, it can make the material melt and mix better; the staggered angle of the meshing block at the end of this section is 90 ^O , which can not only increase the meshing strength, but also increase the resistance of material flow and increase the pressure of this section, while the last reaction of this section Conveying blocks to the thread also has the effect of increasing material flow resistance and increasing pressure.

The exhaust section 3 is composed of the following threaded elements in sequence: two conveying blocks with a lead of 64mm and a length of 64mm, three conveying blocks with a lead of 48mm and a length of 48mm, and conveying blocks with a lead of 32mm and a length of 32mm. The initial conveying block of the exhaust section 3, that is, the conveying block with a lead length of 64 mm and a length of 64 mm is located directly below the exhaust port 7. The exhaust port 7 has two functions: one is to discharge gas to release part of the pressure, and the other is to input material from the exhaust port 7, and the function of the exhaust section 3 is to allow the material to enter the screw smoothly. The lead of the conveying block in this section shows a decreasing trend, and its function is similar to that of the feeding section 1, even if the material obtains a certain pressure at the end of this section, so that the material enters the dispersion section 4 smoothly.

The dispersing section 4 is composed of the following thread elements in sequence: two engaging blocks with a length of 48mm and a staggered angle of 45 ^O , and the number of engaging discs is 5; a conveying block with a lead of 48 mm and a length of 48 ^mm ; Engaging block with 5 meshing discs, lead 48mm, conveying block with length 48mm, length 48mm, staggered angle 45 ^O , engaging block with 5 engaging discs, lead 32mm, conveying block with length 32mm, length 32mm staggered angle 60 ^O , Engagement block with 4 meshing discs, 48 mm in length, staggered angle of 90 ^O , 5 engaging discs in number, reverse thread conveying block with lead 32 mm and length 16 mm. The effect of dispersing section 4 is to disperse material, and dispersing section 4 has three meshing areas and an independent meshing block in the present embodiment, wherein an independent meshing block is separated between the second meshing area and the 3rd meshing area, In the existing technology, the independent meshing block is generally combined into the second meshing area, which will cause the excessive shear force of the meshing area to damage the surface of the material and also cause the problem of high temperature. Now the meshing The separate arrangement of the blocks avoids the problem of excessive shear forces in this meshing zone. At the end of the section, the meshing block with a staggered angle of 90 and the reverse thread conveying block are used to increase the resistance of the material to pass through, reduce the flow rate of the material and make the material disperse for a longer time. Since the PA6 material will produce more volatile substances during production, the reverse thread conveying block in the last section is placed under the vacuum port to allow the volatile substances in the material to be sucked away from the vacuum port more thoroughly.

The discharge section 5 is composed of the following thread elements in sequence: two conveying blocks with a lead of 64mm and a length of 64mm, a conveying block with a lead of 48mm and a length of 48mm, and five conveying blocks with a lead of 32mm and a length of 32mm. The lead of the conveying block in this section shows a decreasing trend, which can make the material have a certain pressure at the outlet.

The above-described embodiments are only preferred embodiments of the present utility model, and are not intended to limit the scope of implementation of the present utility model, so all changes made according to the shape and principle of the present utility model should be covered by the scope of the present utility model. within the scope of protection.

Claims (3)

1. A combined screw for producing PA6 fiber modified materials, which is used in an engineering plastic granulator, comprising a mandrel and a threaded element sleeved on the mandrel, the threaded element is divided into two parts for conveying The conveying part of the material or the meshing block used for dispersing the material, the screw is divided into a feeding section (1), a melting section (2), an exhaust section (3), a dispersion section (4), and a discharge section (5) ), characterized in that: the feeding section (1) is composed of several conveying blocks, wherein the lead of the conveying block located before the feed port (6) of the barrel of the engineering plastic granulator shows an increasing trend at the feed port (6) The lead of the subsequent conveying blocks shows a decreasing trend; the melting section (2) includes several meshing areas, each engaging area contains two engaging blocks and each engaging area is separated by a conveying block, and the last engaging The section includes at least one engagement block with a staggered angle of 90 ^° and the last threaded element of this section is a reverse thread delivery block; the exhaust section (3) is composed of several delivery blocks and its initial delivery block is located in engineering plastics Below the exhaust port (7) of the barrel of the granulator, the lead of the conveying block shows a decreasing trend; the dispersing section (4) includes several meshing zones containing two meshing blocks, and the gap between each meshing zone is Separated by a conveying block, the penultimate threaded element of this section is an engaging block with a staggered angle of 90 ^° . The last threaded element is a reverse threaded conveying block and is located under the vacuum port (8) of the barrel of the engineering plastic granulator. There is also a separate meshing block in the middle of this section, and there is a conveying block between the separate meshing block and the adjacent meshing area; the discharge section (5) is composed of several conveying blocks and its initial thread The element is located below the vacuum port (8), and the lead of the conveying block shows a decreasing trend. 2. A combined screw for producing PA6 fiber modified materials according to claim 1, characterized in that; the conveying block located below the feeding port (6) in the feeding section (1) has at least One piece is SK type conveying block. 3. A combined screw for producing PA6 fiber modified materials according to claim 1, characterized in that; the stagger angle of the meshing blocks in the melting section (2) and the dispersion section (4) is at least 45° ^O.