CN204183744U - A kind of assembled screw rod for the production of PET material - Google Patents

Abstract

The utility model discloses a combined screw rod used for producing PET materials. The screw rod 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 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 PET materials

technical field

The utility model relates to the technical field of extrusion screws, in particular to a combined screw used for producing PET 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 common screw has a combined screw, and 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 PET materials that can improve the quality of PET materials and make the dispersion effect good in view of the characteristics of PET materials 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 for producing PET materials, which is used in engineering plastic granulators, 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 before the feed inlet of the barrel of the engineering plastic granulator presents an increasing trend, the lead of the conveying block after the feed inlet presents a decreasing trend and at the beginning of the section At least two of them are SK-type conveying blocks; the melting section includes several meshing zones, each meshing zone contains four to five meshing blocks and each meshing zone is separated by three conveying blocks, wherein each meshing zone The last meshing block is a meshing block with a staggered angle of 90 ^° ; the exhaust section is composed of several conveying blocks with the same lead and the section is located below the exhaust port of the barrel of the engineering plastic granulator, and the last section of this section is The section conveying block is a SK type conveying block; the dispersing section includes several engaging areas, each engaging area contains two engaging blocks and each engaging area is separated by two conveying blocks, wherein the length of each engaging block in this section , the staggered angle and the number of meshing discs are the same, and the last section of the threaded element in this section is a reverse threaded conveying block; the discharge section is composed of several conveying blocks and the middle section is located at the vacuum port of the barrel of the engineering plastic granulator Below, the lead of the conveying block shows a decreasing trend, and the first section of the conveying block in this section is a 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 effect of the utility model is that: the PET material produced by the combined screw used for producing PET material provided by the utility model has good quality and good dispersion effect.

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 six barrels, wherein the first barrel has a feed port 6, and the fourth barrel has an exhaust port 7. , There is a vacuum port 8 on the barrel of the sixth section, and 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 thread elements in sequence: two SK-type conveying blocks with a lead of 48mm and a length of 48mm, a conveying block with a lead of 48mm and a length of 48mm, and a conveying block with a lead of 32mm and a length of 32mm. Conveyor blocks with a lead of 22mm and a length of 22mm. 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 threaded elements in sequence: two engaging blocks with a length of 32mm, a staggered angle of 45 ^O , and a number of engaging discs of 5, and an engaging block with a length of 32 mm, an staggered angle of 60 ^O , and a number of engaging discs of 4, with a length of 32 mm , an engaging block with a stagger angle of 45 ^O and a number of 5 meshing discs, an engaging block with a length of 32mm, a staggered angle of 90 ^O , and a number of 5 engaging discs, a conveying block with a lead of 48mm and a length of 48mm, two conveying blocks with a lead of 32mm and a length of 32mm Blocks, three engaging blocks with a length of 32mm, a stagger angle of 45 ^O , and a number of 5 engaging discs, and three engaging blocks with a length of 32 mm, a staggering angle of 90 ^O , and a number of 5 engaging discs. The role of melting section 2 is to melt and mix materials in this section. The staggered angles of the meshing blocks in this section are all 45 ^° or above, and the shear stress is strong. There are two meshing zones in this section, the first meshing zone is composed of The second meshing area is composed of four meshing blocks. The greater the number of meshing blocks in the meshing area, the stronger the shearing force, and the same number of meshing blocks are connected together to form the meshing area. The shear force of the independent meshing block is relatively higher; at the same time, because the last meshing block of the two meshing areas is an engaging block with a staggered angle of 90 ^° , its higher shear force further improves the shear force of the meshing area. cut force. The material can be uniformly dispersed under the action of the shear force in the meshing area, and the temperature of the material will increase under the strong shear force, which is more conducive to the melting of the material.

The exhaust section 3 is composed of the following threaded elements in sequence: five conveying blocks with a lead of 48mm and a length of 48mm, and SK-type conveying blocks with a lead of 48mm and a length of 48mm. The middle part of this section is located under 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 materials from the exhaust port 7, and the function of the exhaust section 3 is to let the material enter the screw smoothly, among which The use of SK-type conveying blocks at the end of the section can effectively avoid the accumulation of materials at the end of the section to form pressure.

The dispersing section 4 is composed of the following thread elements in sequence: two engaging blocks with a length of 32mm, a staggered angle of 45 ^O , and the number of engaging discs of 5, a conveying block with a lead of 48mm and a length of 48mm, a conveying block with a lead of 32mm and a length of 32mm, and two Engagement block with length 32mm, staggered angle 45 ^O , number of engagement discs 5, lead 22mm, reverse thread conveying block with length 11mm. The function of the dispersing section 4 is to disperse the material. In the present embodiment, the dispersing section 4 has two meshing zones, and each meshing zone is composed of two meshing blocks, wherein each meshing block has a length of 32 mm, a shear angle of 45 ^° , and a meshing For the meshing block with 5 disks, due to the shearing force of the meshing block and its staggered angle and the thickness of the meshing disks, each meshing block in this section has the same shear force, which means that the material is passing through these meshing blocks. The block resistance is the same, avoiding the accumulation of materials in a certain place, which will cause a large pressure in this place and damage the appearance of the PET material. At the same time, the uniform shear force also allows the PET material to be evenly dispersed.

The discharge section 5 is composed of the following threaded elements in sequence: five conveying blocks with a lead of 48mm and a length of 48mm, three conveying blocks with a lead of 32mm and a length of 32mm, and conveying blocks with a lead of 22mm and a length of 22mm. The middle part of this section is located under the vacuum port 8, and the function of the vacuum port 8 is to suck away the volatile components in the material. 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 (2)

1. the assembled screw rod for the production of PET material, this screw rod is applied in engineering plastics comminutor, comprise mandrel and be enclosed within the screwing element on mandrel, described screwing element is divided into the conveying member for convey materials or the gear block for dispersed material, and described screw rod is divided into feeding section (1) successively, melt zone (2), exhaust section (3), dispersion section (4), discharge zone (5), is characterized in that; Described feeding section (1) is made up of some transfer block, and its helical pitch of transfer block be wherein positioned at before the charging aperture (6) of engineering plastics feed cylinder of granulator is that the transfer block helical pitch of increasing trend after charging aperture (6) tapers off trend and have two pieces at least for SK type transfer block at the section head of this section; Described melt zone (2) comprises some region of engagements, and each region of engagement comprises four to five gear blocks and three transfer block of being separated by between each region of engagement, and the final section gear block wherein in each region of engagement is alternate angle 90 ^ogear block; Described exhaust section (3) is made up of the transfer block that some helical pitches are identical and its stage casing part is positioned at below the exhaust outlet (7) of engineering plastics feed cylinder of granulator, and this section of final section transfer block is SK type transfer block; Described dispersion section (4) comprises several region of engagements, each region of engagement comprises two gear blocks and two transfer block of being separated by between each region of engagement, wherein the length of this section of each gear block, alternate angle and mesh plate quantity are all identical, and the final section screwing element of this section is reverse thread transfer block; Described discharge zone (5) is made up of some transfer block and its stage casing part is positioned at vacuum port (8) below of engineering plastics feed cylinder of granulator, and the helical pitch of transfer block tapers off trend.

2. a kind of assembled screw rod for the production of PET material according to claim 1, is characterized in that; The alternate angle of described melt zone (2) and the middle gear block of dispersion section (4) is at least 45 ^o.