CN214448369U

CN214448369U - Crosslinked fluoroplastic extruding screw

Info

Publication number: CN214448369U
Application number: CN202120347943.7U
Authority: CN
Inventors: 柳朝阳
Original assignee: Xiangtan Special Cable Co Ltd
Current assignee: Xiangtan Special Cable Co Ltd
Priority date: 2021-02-07
Filing date: 2021-02-07
Publication date: 2021-10-22
Anticipated expiration: 2031-02-07

Abstract

The utility model provides a cross-linked fluoroplastic extrusion screw, which is arranged in a machine neck and a machine barrel, a gap is formed between the screw and the machine barrel, and a machine neck inner cavity is formed between the screw and the machine neck; the clearance between the screw and the cylinder is less than or equal to 0.05 mm. The machine neck and the machine barrel are fixed through an assembling flange. The utility model avoids the occurrence of the faults of backflow, backflow or leakage of the sizing material at the screw rod and the machine neck, increases the cleaning interval time of the screw rod, avoids the short end of the produced cross-linked fluoroplastic insulated wire caused by the faults, and improves the quality of the product; the extrusion glue yield of the utility model is effectively improved, and the production efficiency is improved; the screw rod has the characteristics of simple structure, small length-diameter ratio, large volume compression ratio and small gap between the screw rod and the machine barrel.

Description

Crosslinked fluoroplastic extruding screw

Technical Field

The utility model particularly relates to a cross-linked fluoroplastics extrudes and uses screw rod.

Background

The cross-linked fluoroplastic insulated wire produced at present in China has excessive short ends and low quality due to the phenomena of wire diameter stability, impurities, dead glue particles, crevasses and the like. The lead is ultrathin in extrusion thickness, and is used as a key part influencing the extrusion quality of the lead, so that the extremely high requirement is provided for the glue discharging stability of the screw. The screw for extruding plastic converts the rotating plastic melt into linear motion, and the linear motion is uniformly and stably guided into the die sleeve and needs certain pressure for molding. The crosslinking fluoroplastic is easy to generate pre-crosslinking with different procedures in the extrusion process, so that the quality of the extruded insulation or sheath is influenced. Therefore, a screw structure which can ensure that the material is fully plasticized and the residence time of the molten rubber material in the machine barrel is short should be selected.

Comparing files: chinese utility model patent publication specification CN204701110U, open day 20151014 discloses a cable material production is with novel bushing type cladding aircraft nose, cladding aircraft nose device includes the aircraft nose body, and the entry end of aircraft nose body is provided with the guiding gutter, the guiding gutter sets up to the toper, and the aircraft nose body exit end is provided with the bush, the inside guide bar that is provided with of aircraft nose body, be provided with the heart yearn in the middle of the guide bar, the outside of bush is provided with cooling device, the cladding aircraft nose still includes the perforated plate, the perforated plate sets up the below at the extruder screw rod, be provided with reposition of redundant personnel sleeve and equalizer ring in the guide bar, the quantity of reposition of redundant personnel sleeve and equalizer ring is one at least.

The structure of the device in the comparison document is complex, the outflow speed of plastic in the comparison document can be hindered, and the complex structure is high in cost and difficult to maintain; the length-diameter ratio of the device in the comparison document is larger, the plasticizing end and the homogenizing end are longer, and the plastic is retained in the machine barrel and the machine neck conical cavity for a long time, so that the phenomenon of pre-crosslinking is difficult to avoid.

Therefore, a cross-linked fluoroplastic extruding screw is needed to solve the problems that the device in the prior art is complex in structure, and pre-crosslinking is easy to occur to plastics, so that the short-end rate of an extruded wire is too high.

SUMMERY OF THE UTILITY MODEL

The utility model provides a cross-linked fluoroplastics extrudes and uses screw rod has simple structure, draw ratio is little, the volume compression ratio is big and the characteristics that the clearance is little between screw rod and the barrel to solve not enough among the prior art.

A cross-linked fluoroplastic extrusion screw comprising:

the machine barrel is provided with a plurality of cylinder bodies,

a machine neck which is connected with the machine barrel,

the screw is arranged in the machine neck and the machine barrel, a gap exists between the screw and the machine barrel, and a machine neck inner cavity exists between the screw and the machine neck;

the clearance between the screw and the cylinder is less than or equal to 0.05 mm.

By adopting the structure, the clearance between the screw and the machine barrel is reduced, and the extrusion outer diameter tolerance of the lead is reduced, so that an ultra-thin insulated lead with the thickness of 0.05mm can be produced, the faults of backflow, backflow or leakage of glue materials at the screw and the machine neck are avoided, the cleaning interval time of the screw is prolonged, the short head of the produced cross-linked fluoroplastic insulated lead caused by the faults is avoided, and the quality of the product is improved; effectively improved the utility model discloses an extrude out gluey volume, promoted the efficiency of production. And the utility model discloses simple structure, low cost is convenient for maintain.

Further, the neck and the barrel are fixed by a mounting flange.

Further, the volume compression ratio of the screw is 3: 1.

adopt such structure, increaseed the utility model discloses a binder removal pressure has promoted the stability that the external diameter was extruded to the screw rod wire, has improved the quality of product.

Further, the length-diameter ratio of the screw is 22: 1.

Further, the taper angle a of the glue outlet end of the screw is 25 degrees.

Further, the ratio of the length of the blanking section of the screw is 60%, the ratio of the length of the plasticizing section is 15%, and the ratio of the homogenizing section is 25%.

Adopt such structure, can shorten the sizing material after the plastify and be in the utility model provides a dwell time for static state is long-pending to be saved and is reduced by a wide margin in sizing material in barrel and machine neck, thereby reduces the phenomenon that the sizing material takes place the pre-crosslinking, has improved finished product quality. In addition, the structure reduces the retention time of gases such as hydrogen fluoride and the like generated by local decomposition of the cross-linked fluoroplastic at high temperature in equipment, reduces the corrosion of the cross-linked fluoroplastic on a screw, a machine barrel, a machine neck and other parts, effectively prolongs the service life of the equipment and reduces the production cost.

The utility model has the advantages as follows:

1. the utility model avoids the occurrence of the faults of backflow, backflow or leakage of the sizing material at the screw rod and the machine neck, increases the cleaning interval time of the screw rod, avoids the short end of the produced cross-linked fluoroplastic insulated wire caused by the faults, and improves the quality of the product; effectively improved the utility model discloses an extrude out gluey volume, promoted the efficiency of production.

2. The utility model discloses can shorten the sizing material after the plastify and be in the utility model provides a dwell time for static state is long-pending to be saved and is reduced by a wide margin in sizing material in barrel and machine neck, thereby reduces the phenomenon that the sizing material takes place the pre-crosslinking, has improved finished product quality.

3. The utility model discloses reduced the dwell time of gas such as hydrogen fluoride that cross-linking fluoroplastics produced in the high temperature local decomposition in equipment, reduced its corruption to positions such as screw rod, barrel and machine neck, effectively prolonged the life cycle of equipment, reduced the cost of production.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Reference numerals:

1. a machine neck; 11. a machine neck inner cavity; 2. a screw; 3. a barrel; 4. assembling a flange; 41. the neck barrel mounts the flange face.

Detailed Description

It is to be understood that the embodiments described below are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that the terms "mounted," "connected," and "connected" are to be construed broadly unless otherwise specifically indicated and limited.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

As shown in fig. 1, a cross-linked fluoroplastic extrusion screw comprising:

the amount of the solvent in the cylinder 3,

a neck 1, which is connected with a machine barrel 3,

the screw 2 is arranged in the machine neck 1 and the machine barrel 3, a gap exists between the screw 2 and the machine barrel 3, and a machine neck inner cavity 11 exists between the screw 2 and the machine neck 1;

the clearance between the screw 2 and the machine barrel 3 is less than or equal to 0.05 mm.

By adopting the structure, the clearance between the screw rod 2 and the machine barrel 3 is reduced, the extrusion outer diameter tolerance of the lead is reduced, so that an ultra-thin insulated lead with the thickness of 0.05mm can be produced, the faults of backflow, backflow or leakage of glue materials at the screw rod 2 and the machine neck 1 are avoided, the cleaning interval time of the screw rod 2 is prolonged, the short end of the produced cross-linked fluoroplastic insulated lead caused by the faults is avoided, and the quality of a product is improved; effectively improved the utility model discloses an extrude out gluey volume, promoted the efficiency of production. And the utility model discloses simple structure, low cost is convenient for maintain.

The neck 1 and the barrel 3 are fixed by a mounting flange 4.

The volume compression ratio of the screw 2 is 3: 1.

adopt such structure, increaseed the utility model discloses a binder removal pressure has promoted the 2 wires of screw rod and has extruded the stability of external diameter, has improved the quality of product.

The length-diameter ratio of the screw 2 is 22: 1.

The taper angle a of the glue outlet end of the screw rod 2 is 25 degrees.

The proportion of the blanking section length of the screw 2 is 60%, the proportion of the plasticizing section length is 15%, and the proportion of the homogenizing section length is 25%.

Adopt such structure, can shorten the sizing material after the plastify and be in the utility model provides a dwell time for static state is long-pending to be saved and is reduced by a wide margin in barrel 3 and machine neck 1, thereby reduces the phenomenon that the sizing material takes place the pre-crosslinking, has improved finished product quality. In addition, the structure reduces the retention time of gases such as hydrogen fluoride generated by local decomposition of the cross-linked fluoroplastic at high temperature in equipment, reduces the corrosion of the gases to the screw 2, the machine barrel 3, the machine neck 1 and the like, effectively prolongs the service life of the equipment and reduces the production cost.

The utility model has the advantages as follows:

1. the utility model avoids the occurrence of the faults of backflow, backflow or leakage of the sizing material at the screw rod 2 and the machine neck 1, increases the cleaning interval time of the screw rod 2, avoids the short end of the produced cross-linked fluoroplastic insulated wire caused by the faults, and improves the quality of the product; effectively improved the utility model discloses an extrude out gluey volume, promoted the efficiency of production.

2. The utility model discloses can shorten the sizing material after the plastify and be in the utility model provides a dwell time for static state is deposited and is reduced by a wide margin in barrel 3 and machine neck 1 sizing material, thereby reduces the phenomenon that the sizing material takes place the pre-crosslinking, has improved finished product quality.

3. The utility model discloses reduced the dwell time of gas such as hydrogen fluoride that cross-linking fluoroplastics produced in high temperature local decomposition in equipment, reduced its corruption to positions such as screw 2, barrel 3 and machine neck 1, effectively prolonged the life cycle of equipment, reduced the cost of production.

Example 2

In this embodiment, the utility model adopts HC276 nickel-based alloy steel with strong corrosion resistance, and the specification of the screw 2 is phi 50.

In the embodiment, the length-diameter ratio of the screw 2 is reduced by adopting the parameters in the embodiment 1, the volume compression ratio is increased, the blanking section of the screw 2 is lengthened, and the plasticizing section and the homogenizing section of the screw are reduced; the taper angle a of the screw glue outlet end of the screw 2 is reduced; the clearance between the screw 2 and the barrel 3 is reduced. Table 1 below shows the modified parameters of example 2 compared to those of a screw for extruding a cross-linked fluoroplastic of the prior art.

TABLE 1

By adopting the cross-linked fluoroplastic extrusion screw with the parameters in the embodiment, the short-end rate of the produced cross-linked fluoroplastic insulated conductor is within 2 percent and is far lower than the short-end rate of 15 percent in the prior art.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. A screw for extruding a crosslinked fluoroplastic, comprising:

a cylinder (3) is arranged in the cylinder,

a machine neck (1) connected with the machine barrel (3),

the screw (2) is arranged in the machine neck (1) and the machine barrel (3), a gap exists between the screw (2) and the machine barrel (3), and a machine neck inner cavity (11) exists between the screw (2) and the machine neck (1);

the clearance between the screw (2) and the machine barrel (3) is less than or equal to 0.05 mm.

2. A crosslinked fluoroplastic extrusion screw according to claim 1 wherein said throat (1) and barrel (3) are secured by mounting flanges (4).

3. A crosslinked fluoroplastic extrusion screw according to claim 1 wherein the volumetric compression ratio of said screw (2) is 3: 1.

4. a crosslinked fluoroplastic extrusion screw according to claim 1 wherein said screw (2) has a length to diameter ratio of 22: 1.

5. A crosslinked fluoroplastic extrusion screw according to claim 1 wherein the taper a of the discharge end of said screw (2) is 25 °.

6. A crosslinked fluoroplastic extrusion screw according to claim 1 wherein said screw (2) has a feed section length of 60%, a plastifying section length of 15% and a homogenizing section length of 25%.