CN204183866U - A kind of assembled screw rod for the production of high filled polypropylene - Google Patents

Abstract

The utility model discloses a combined screw for producing high-filling polypropylene. The screw is used in an engineering plastic granulator and includes a mandrel and a threaded element sleeved on the mandrel. The threaded element is divided into two parts: Conveying parts for transporting materials and meshing blocks for dispersing materials, the screw is divided into a feeding section, a melting section, a mixing section and a discharging section in sequence according to the conveying direction of the materials.

Description

A combined screw for the production of highly filled polypropylene

technical field

The utility model relates to the technical field of extrusion screws, in particular to a combined screw used for producing high-filling polypropylene.

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 structure of the combined screw is composed of several threaded elements sleeved on the mandrel. The commonly used threaded elements of the combined screw include conveying blocks and engaging blocks. 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.

In the production of high-filling polypropylene, generally 13-16 meshing blocks are added to make the materials fully mixed and dispersed. However, the use of this combination of screws in actual production will cause the power consumption of the extruder to remain high. No more.

Contents of the invention

The purpose of this utility model is to solve the above problems and provide a combined screw for producing high-filling polypropylene that can save power consumption of the extruder and improve production efficiency.

In order to achieve the above effects, the technical solution adopted by the utility model is: a combined screw for producing high-filling polypropylene, which is used in an engineering plastic granulator and includes a mandrel and a screw thread sleeved on the mandrel The screw element is a conveying part for conveying materials or an engaging block for dispersing materials. The screw is divided into a feeding section, a melting section, a mixing section and a discharging section according to the conveying direction of the material. The feeding section is composed of six conveying blocks and the first conveying block is located below the feeding port of the barrel, wherein the leads of the fourth, fifth and sixth conveying blocks gradually decrease; the melting section includes four An engaging block and several conveying blocks, the four engaging blocks are as follows: a staggered angle of 30 ^O , an engaging block with 7 engaging discs, a staggered angle of 45 ^O , an engaging block with 5 engaging discs, a staggered angle of 45 ^O , a Engaging block with 5 engaging discs, staggered angle 90 ^O , engaging block with 5 engaging discs, in which the first and second engaging blocks are respectively located at the first and second sections of the melting section, and the third engaging block is located at the melting In the middle section of the section, the fourth meshing block is located in the penultimate section of the melting section and a conveying block with reverse thread is set in the last section; the mixing section includes five meshing blocks and several conveying blocks and the first thread The element is located below the exhaust port of the barrel, and the five engaging blocks are as follows: an engaging block with a staggered angle of 30 ^O , an engaging block with 7 engaging discs, an engaging block with three staggered angles of 45 ^O , and 5 engaging discs, and a staggered angle 90 ^O , meshing blocks with 5 meshing discs, the first meshing block is located in the fourth or fifth section of the mixing section, the second and third meshing blocks are located between the first and fourth meshing blocks In the middle section, the fourth and fifth meshing blocks are respectively the penultimate section and the penultimate section of the mixing section and a conveying block with reverse thread is set in the last section; the vacuum section of the discharge section is composed of several conveying The blocks are composed and the first section of the conveying block is located under the vacuum port of the barrel, where the lead of the conveying blocks decreases sequentially.

Further, the conveying blocks located below the exhaust port on the mixing section are all conveying blocks with a length of 72 mm and a lead of 72 mm.

The beneficial effects of the utility model are: a combined screw for producing high-filling polypropylene provided by the utility model only adopts nine engaging blocks, and only two engaging blocks with relatively high engaging strength cause damage to the material The resistance is small, so it can reduce the power consumption of the extruder, and because the meshing block is reduced and the conveying block is increased, the discharge speed is also accelerated to improve production efficiency.

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.

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

Detailed ways

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 5, and the fourth section of material barrel has an exhaust port 6 , the seventh section of the barrel is a vacuum port 7, the length of all barrels is 240mm. A combined screw for producing highly filled polypropylene of the utility model includes a feeding section 1 , a melting section 2 , a mixing section 3 and a discharging section 4 .

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 angle a formed between two adjacent meshing disks is called the staggered angle. The greater the thickness of the meshing disk, the larger the staggered angle, and the greater the shear force of the meshing block.

Among them, the feeding section 1 is located in the feeding port 5 of the granulator, and its function is to make the material enter the screw smoothly, so this section is composed of a conveying block with a large lead so that this section has a faster transportation speed for the material To avoid material clogging in the feed port 5, the specific combination sequence of screw elements is: a conveying block with a length of 56mm and a lead of 56mm, three conveying blocks with a length of 72mm and a lead of 72mm, a conveying block with a length of 64mm and a lead of 64mm, and a length of 56mm Conveying block with a lead of 56mm; it can be seen that the lead of this section of the conveying block increases to 72mm at the beginning and then decreases to 56mm at the end. In the middle, when it reaches the end section, it is necessary to slow down the material to avoid accumulation of too much material in the melting section 2.

The function of the melting section 2 is to melt the material in this section. The engagement block is set in this section to disperse the material and facilitate melting. The specific combination sequence of the threaded elements is: staggered angle 30 ^° , 7 engaging discs, An engaging block with a length of 64mm, a stagger angle of 45 ^O , five engaging discs, and a length of 56 mm, two conveying blocks with a length of 56 mm and a lead of 56 mm, a staggering angle of 45 ^O , five engaging discs, and a length of 56mm engaging block, two conveying blocks with a length of 64mm and a lead of 64mm, a conveying block with a length of 44mm and a lead of 44mm, and a staggered angle of 90 ^O , five engaging discs, and an engaging block with a length of 56mm and a length of 44mm. The conveying block with a distance of 22mm and reverse thread; the engaging blocks set in this section are the engaging blocks with a staggered angle of 30 ^O , 7 engaging discs, and a length of 64mm, and two staggered angles of 45 degrees, with 5 engaging discs, The meshing block with a length of 56mm, a staggered angle of 90 ^O , 5 meshing discs, and a length of 56mm, the greater the meshing strength of the meshing block, the stronger the dispersion and mixing effect on the material, and it will also increase the passing of the material. resistance. In the front section of this section, two meshing blocks with small meshing strength are used to enable the material to enter this section smoothly; at the end of this section, a shearing block with high meshing strength and a conveying block with reversed thread are set to increase the amount of material The passing resistance increases the time for material melting and dispersing mixing, and at the same time improves the effect of dispersing and mixing, so that the material can be fully melted as much as possible when leaving this section; the material has been initially melted in the middle section of this section, and at the same time it is also set at the end section. Two meshing blocks with higher meshing strength are installed, so setting a meshing block with a smaller meshing strength in the middle section will not have a great impact on the final melting effect of this section, and using a meshing block with a smaller meshing strength will also reduce power consumption and at the same time It can reduce the passage time of materials and improve production efficiency.

The mixing section 3 is located under the exhaust port 6 of the granulator. The function of the exhaust port 6 is to discharge gas and add fillers. The function of the mixing section 3 is to fully mix the materials. The specific combination sequence of the screw elements is: two pieces Conveying block with length 72mm and lead 72mm, conveying block with length 64mm and lead 64mm, stagger angle 30 ^O , 7 pieces of meshing discs, meshing block with length 56mm, conveying block with length 64mm and lead 64mm, length 56mm and lead 56mm Conveyor block, length 44mm, lead 44mm, two staggered angles 45 ^O , 5 meshing discs, length 36mm, length 56mm, lead 56mm, two length 44mm, lead 44mm , the staggered angle is 45 ^O , there are 5 engaging discs, the engaging block with a length of 36mm, the staggered angle is 90 ^O , the number of engaging discs is 5, the engaging block with a length of 36mm, the conveying block with a length of 44mm and a lead of 22mm, and the thread is reversed; exhaust Port 6 is in the front section of this section. In order to allow the filler to enter the screw smoothly, a conveying block with a larger lead and a meshing block with a smaller meshing strength are set at the front end for preliminary mixing; at the end of this section, two There are two meshing blocks and the meshing blocks close to the stage have greater meshing strength. After the two meshing blocks, there is also a conveying block with reverse threads. Its function is to make the materials fully mixed before leaving this section; in this section In the middle section, two meshing blocks with smaller meshing strength can be set to allow the materials to be fully mixed and consume less power.

The discharge section 4 is located under the vacuum port 7 of the granulator, and the volatile components in the material are sucked away by the vacuum port 7. The specific combination sequence of the threaded elements is: two conveying blocks with a length of 72 mm and a lead of 72 mm, and four blocks with a length of 56 mm Conveying block with a lead of 56mm and two conveying blocks with a length of 44mm and a lead of 44mm; Send it away as soon as possible, and the overall trend of the lead of the conveying block in this section is from large to small. The large lead of the front section conveys more materials, and the small lead of the tail section conveys less material. In this way, a certain pressure can be generated due to the accumulation of materials. The output is stable.

The utility model provides a combined screw for producing high-filling polypropylene, which only uses nine engaging blocks, and only two engaging blocks with high engaging strength, which causes less resistance to the material and thus reduces the drug effect. The power consumption of the extruder and the reduction of the meshing block and the increase of the conveying block also speed up the discharge speed and improve the production efficiency.

The implementation examples described above 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 (2)

1. A combined screw for producing high-filling polypropylene, which is used in an engineering plastic granulator and includes a mandrel and a threaded element sleeved on the mandrel, and the threaded element is divided into two parts for conveying materials The conveying part and the meshing block for dispersing the material are characterized in that the screw is divided into a feeding section (1), a melting section (2), a mixing section (3) and a discharging section according to the conveying direction of the material. (4), the feeding section (1) is composed of six conveying blocks and the first conveying block is located below the feeding port (5) of the barrel, and the guides of the fourth, fifth and sixth conveying blocks The ^distance gradually decreases; the melting section (2) includes four engaging blocks and several conveying ^blocks . Engaging block with 5 engaging discs, staggered angle 45 ^O , engaging block with 5 engaging discs, staggered angle 90 ^O , engaging block with 5 engaging discs, in which the first and second engaging blocks are respectively located in the melting section ( 2) The first and second sections, the third engagement block is located in the middle section of the fusion section (2), the fourth engagement block is located in the penultimate section of the fusion section (2) and a thread reverse is set at the last section The conveying block; the mixing section (3) includes five engaging blocks and several conveying blocks and the first threaded element is located below the exhaust port (6) of the barrel, and the five engaging blocks are: staggered angle 30 ^O , an engaging block with 7 engaging discs, three staggered angles of 45 ^O , an engaging block with 5 engaging discs, a staggered angle of 90 ^O , and an engaging block with 5 engaging discs, the first engaging block is located at the mixing The fourth or fifth section of section (3), the second and third engagement blocks are located in the middle section between the first and fourth engagement blocks, and the fourth and fifth engagement blocks are respectively mixing sections (3 ) of the penultimate section and the penultimate section and a conveying block with a reverse thread is set in the last section; the discharge section (4) vacuum section is composed of several conveying blocks and the first conveying block is located in the barrel Below the vacuum port (7), the lead of the conveying block decreases sequentially. 2. A combined screw for producing high-filling polypropylene according to claim 1, characterized in that: the length of the mixing section (3) located below the exhaust port (6) is 72mm, Conveyor blocks with a lead of 72mm.