CN204183864U - A kind of assembled screw rod for the production of PA66 material - Google Patents

Abstract

The utility model discloses a combined screw used for producing PA66 materials. The screw is used in an engineering plastic granulator and comprises 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, a melting section, an exhaust section, a dispersing section, and a discharging section in turn.

Description

A combined screw for producing PA66 material

technical field

The utility model relates to the technical field of extrusion screws, in particular to a combined screw used for producing PA66 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. Among them, the more common 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 the utility model is to provide a combined screw for producing PA66 materials that can improve the quality of PA66 materials according to the characteristics of PA66 materials and the requirements of production technology.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a combined screw for producing PA66 material, which is used in an engineering plastic granulator, including a mandrel and a threaded element sleeved on the mandrel, The screw element is divided into a conveying part for conveying materials or an engaging block for dispersing materials, and the screw is divided into a feeding section, a melting section, an exhaust section, a dispersing section, a discharging section, and the feeding section in turn. The section is composed of several conveying blocks, among which the lead of the conveying block located before the feed port of the engineering plastic granulator barrel shows an increasing trend, and the lead of the conveying block after the feed port presents a decreasing trend, and there are at least four blocks Conveyor blocks with a lead of 64mm; the melting section includes several meshing areas, each meshing area contains at least three meshing blocks and each meshing area is separated by a transport block, and the stagger angle of the meshing blocks in each meshing area is increasing trend, the last meshing area of this section includes at least one meshing block with a staggered angle of 90 ^O , and the last threaded element of this section is a reverse thread delivery block; the exhaust section is composed of several delivery blocks, and its initial The conveying block is located under the exhaust port of the barrel of the engineering plastic granulator, and the lead of the conveying block shows a decreasing trend; the dispersing section includes several meshing areas, each meshing area contains two meshing blocks and each meshing area There are two conveying blocks between them, the first meshing area of this section includes at least one meshing block with a stagger angle of 90 ^° , and the other meshing blocks except the first meshing area are composed of meshing blocks with a staggered angle of 60 ^° , the last thread element of this section is a reverse thread conveying block and the reverse thread conveying block is located below the vacuum port of the barrel of the engineering plastic granulator; the discharge section is composed of several conveying blocks and its initial thread The component is located under the vacuum port of the barrel of the engineering plastic granulator, and the lead of the conveying block shows a decreasing trend, including at least four conveying blocks with a lead of 64mm.

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 ^° .

Further, the initial conveying block of the discharge section is an SK type conveying block.

The beneficial effect of the utility model is that: the PA66 material produced by the combined screw used for producing the PA66 material provided by the utility model has good quality.

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 seven barrels, wherein the first barrel has a feed port 6, and the fourth barrel has an exhaust port 7 , the sixth barrel is a vacuum port 8, the length of all barrels is 240mm. 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.

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.

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, two SK-type conveying blocks with a lead of 64mm and a length of 64mm, and two conveying blocks with a lead of 64mm and a length of 64mm block, a conveyor block with a lead of 48mm and a length of 48mm, and two conveyor blocks 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: an engaging block with a length of 64mm, a staggered angle of 30 ^O , and a number of 7 engaging discs; Engagement block with angle 60 ^O , number of engagement discs 4, lead 48mm, engagement block length 48mm, length 48mm, stagger angle 45 ^O , number of engagement discs 5, length 32mm, stagger angle 60 ^O , number of engagement discs 4 engaging blocks, 48mm in length, staggered angle 90 ^O , 5 engaging discs, 32mm lead and 16mm in reverse thread conveying block. 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, the effect of melting and mixing of materials is better; there are two meshing areas in this section, and each meshing area is composed of three meshing blocks, of which the last meshing block on the second meshing area has a staggered angle of 90 ^° The greater the shearing force of the meshing block, the better the dispersion effect of the material; the staggered angle of the meshing block in each meshing area shows an increasing trend, because the greater the staggered angle of the meshing block, the greater the shear force, the greater the material flow resistance. The larger the staggered angle of the meshing blocks, the successively increasing the shearing force can be distributed on the meshing blocks more evenly, and the last conveying block in this section is the conveying block behind the meshing block with a staggered angle of 90 ^° It is a reverse thread conveying block, which can increase the flow resistance of the material and prolong the residence time of the material there, so that the meshing block with a stagger angle of 90 ^° can continuously disperse the material.

The exhaust section 3 is composed of the following thread elements in sequence: two conveying blocks with a lead of 64mm and a length of 64mm, and a conveying block with a lead of 48mm and a length of 48mm. 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 first two conveying blocks in this section are conveying blocks with a lead of 64mm, and their larger leads allow materials to pass through the two conveying blocks quickly, avoiding the accumulation of materials under the exhaust port 7, which hinders feeding of materials and releasing pressure; 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: an engaging block with a length of 32mm, a staggered angle of 45 ^O , and a number of 5 engaging discs; an engaging block with a length of 48 mm, an staggered angle of 90 ^O , and a number of 5 engaging discs, with a lead length of 48 mm 48mm conveying block, 32mm lead, 32mm long conveying block, two meshing blocks with 32mm length, staggered angle 60 ^O , 4 engaging discs, 48mm lead, 48mm long conveying block, 32mm lead, 32mm long conveying block , two engagement blocks with a length of 32mm, a staggered angle of 60 ^O , and a number of four engagement discs, and a reverse thread conveying block with a lead of 32mm and a length of 16mm. The effect of distributing section 4 is that material is dispersed, and in the present embodiment, distributing section 4 has three meshing zones, and each meshing zone is made up of two joints of meshing pieces, wherein the stagger angle of the second meshing piece in the first meshing zone is 90 ^O makes the meshing area have a larger shear force, and the larger shear force can fully disperse the material. The significance of the larger shear force in the meshing area is that when the material enters this section, it will be cut by the shear force first. The larger meshing area is dispersed, and the material generates a certain pressure at the end of the exhaust section. Under the cooperation of pressure and shear force, the material can be dispersed more effectively, so that the obtained PA66 material has a good dispersion effect. Well, at the same time, the appearance of the material is also improved due to the grinding effect on the PA66 material during dispersion. In the last section of this section, the threaded element is a reverse thread conveying block, which increases the resistance of the material to pass through, reduces the material flow speed, and makes the material disperse longer; in addition, because the reverse thread conveying block is located below the vacuum port 8, the reverse thread conveying The block can also prolong the time that the material is under the vacuum port 8, so that the volatile substances in the material can be sucked away more effectively.

The discharge section 5 is composed of the following thread elements in sequence: SK type conveying blocks with a lead of 64mm and a length of 64mm, three conveying blocks with a lead of 64mm and a length of 64mm, conveying blocks with a lead of 48mm and a length of 48mm, and three conveying blocks with a lead of 32mm 32mm conveyor block. The first conveying block of this section is located under vacuum port 8, next to the reverse threaded conveying block in the dispersing section. The first threaded conveying block is a SK-type conveying block with a lead of 64mm, and the material it holds has a multi-material flow rate. It is also block, which can avoid the phenomenon of vacuum returning material due to excessive accumulation of material under the vacuum port 8. In addition, the lead of the conveying block in this section shows a decreasing trend, which can make the material generate a certain pressure at the end of this section and discharge the material smoothly.

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 (4)

1. A combined screw for producing PA66 material, which is used in an engineering plastic granulator, including a mandrel and a threaded element sleeved on the mandrel, and the threaded element is divided into conveying materials for conveying Parts or meshing blocks for dispersing materials, the screw is divided into feeding section (1), melting section (2), exhausting section (3), dispersing section (4), and discharging section (5). The feature is that the feeding section (1) is composed of several conveying blocks, among which the lead of the conveying block before the feed port (6) of the barrel of the engineering plastic granulator shows an increasing trend, and at the feed port (6) ) The lead of the conveying block after ) presents a decreasing trend, and there are at least four conveying blocks with a lead of 64mm; There is a conveying block between the zones, and the stagger angle of the meshing blocks in each meshing zone shows an increasing trend. The last meshing zone of this section includes at least one meshing block with a staggering angle of 90 ^° , and the last threaded element of this section is reversed. Thread conveying block; the exhaust section (3) is composed of several conveying blocks, and its initial conveying block is located below the exhaust port (7) of the barrel of the engineering plastic granulator, and the lead of the conveying block shows a decreasing trend; The dispersing section (4) includes several meshing areas, each meshing area contains two meshing blocks and each meshing area is separated by two conveying blocks, wherein the first meshing area of this section includes at least one staggered angle The meshing block is 90 ^O , the other meshing areas except the first meshing area are composed of meshing blocks with a staggered angle of 60 ^O , the last thread element of this section is a reverse thread conveying block and the reverse thread conveying block Located below the vacuum port (8) of the barrel of the engineering plastic granulator; the discharge section (5) is composed of several conveying blocks and its starting thread element is located under the vacuum port (8) of the barrel of the engineering plastic granulator , The lead of the conveying block shows a decreasing trend, including at least four conveying blocks with a lead of 64mm. 2. A combined screw for producing PA66 material according to claim 1, characterized in that at least one of the conveying blocks located below the feed inlet (6) in the feeding section (1) is SK type of conveyor block. 3. A combined screw for producing PA66 material according to claim 1, characterized in that the stagger angle of the meshing blocks in the melting section (2) and the dispersing section (4) is at least 45 ^° . 4. A combined screw for producing PA66 material according to claim 1, characterized in that the initial conveying block of the discharge section (5) is an SK type conveying block.