CN213006476U

CN213006476U - Thermoplastic pipe extrusion molding machine head shunt

Info

Publication number: CN213006476U
Application number: CN202020912102.1U
Authority: CN
Inventors: 王文笔; 刘涛; 李振声; 吴出华
Original assignee: Nam Sok Building Material Products Shenzhen Co ltd
Current assignee: Nam Sok Building Material Products Shenzhen Co ltd
Priority date: 2020-05-27
Filing date: 2020-05-27
Publication date: 2021-04-20
Anticipated expiration: 2030-05-27

Abstract

A thermoplastic tubing extrusion molding head diverter comprising: die sleeve and mold core to and the brace rod of symmetric distribution between die sleeve and mold core, form the circular ring form passageway that supplies heat to mould the melt and flow through between die sleeve and the mold core, its characterized in that: the support ribs are Y-shaped structure support ribs; and at least three Y-shaped structure supporting ribs are symmetrically distributed between the die sleeve and the die core, and the fork opening ends of the Y-shaped structure supporting ribs are connected with the die sleeve to form an auxiliary channel. The Y-shaped structure supporting ribs can enable the polymer melt to be stranded into a material flow in a shape like a Chinese character 'pin' when passing through the circular channel of the flow divider, and the material flow is more easily compacted in a rear-section compression area; the split trace of the seam line in the extrusion molding of the pipe is reduced, and the probability of radial linear fracture of the pipe caused by hoop stress and radial impact force at the seam line of the pipe is reduced. Under the same process conditions, the rigid polyvinyl chloride pipe extruded and molded by the splitter has stronger internal pressure resistance, stronger impact resistance and better surface optical property.

Description

Thermoplastic pipe extrusion molding machine head shunt

Technical Field

The utility model relates to a thermoplastic pipe extrusion moulding machine, especially a thermoplastic pipe extrusion moulding aircraft nose shunt.

Background

At present, the machine head for extrusion molding of rigid polyvinyl chloride pipes is a straight-through machine head, as shown in fig. 1, and comprises a left die 1, a right die 2, a splitter cone 3 arranged in the left die 1, a core die 4 arranged in the right die 2, and a splitter 5 arranged between the left die 1, the splitter cone 3, the right die 2 and the core die 4, wherein the splitter 5 is as shown in fig. 2, and the splitter 5 comprises a die sleeve 51, a die core 52 arranged in the die sleeve 51 and used for supporting and mounting the splitter cone 3 and the core die 4, and a support rib 53 arranged between the die sleeve 51 and the die core 52. The splitter support ribs are used for supporting and forming an annular channel between the die sleeve 51 and the die core 52 for the flowing of hot plastic melt, and simultaneously, the melt flowing from the left die is uniformly stirred and stranded to enter a die cavity formed between the right die opening and the die core. The existing support rib 53 is in an I shape, when a polymer melt passes through the I-shaped structure support rib, an I-shaped shunt mark is generated from the inner surface to the outer surface of a pipe blank formed at the downstream, and although the pipe blank is further compacted and healed through a compression area, under the existing conditions of shear rate and temperature, macromolecules split into two layers cannot establish obvious melt entanglement characteristics, so that a pipe product shows the reduction of mechanical property and optical property; thirdly, the number of the support ribs of the traditional straight-through type machine head shunt is generally 3-8, and when the rigid polyvinyl chloride pipe with large outer diameter is produced, the number of seam lines generated by a pipe product is also large, so that the strength performance of the pipe is reduced, and the pipe is easily damaged by hoop stress and radial impact force.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that compensate above-mentioned prior art's defect, provide a can reduce tubular product reposition of redundant personnel trace and lead to the thermoplastic pipe extrusion moulding aircraft nose shunt of goods quality problems.

The technical problem of the utility model is solved through following technical scheme.

The thermoplastic pipe extrusion molding machine head splitter comprises: the mould cover and set up the mold core that supplies reposition of redundant personnel awl, mandrel support installation in the mould cover to and the brace rod of symmetric distribution between mould cover and mold core, form the circular ring form passageway that supplies heat to mould the melt stream through between mould cover and the mold core.

The thermoplastic pipe extrusion molding machine head flow divider is characterized in that:

the supporting ribs are Y-shaped structural supporting ribs with the cross sections similar to Y;

at least three Y-shaped structural support ribs are symmetrically distributed between the die sleeve and the die core;

and the fork mouth end of the Y-shaped structure support rib is connected with the die sleeve to form an auxiliary channel.

The utility model discloses the technical problem of thermoplastic pipe extrusion moulding aircraft nose shunt further solves through following technical scheme.

The Y-shaped structure supporting rib consists of an arc section, upper supporting legs connected to two ends of the side of the arc section die sleeve and a lower supporting leg connected to the middle of the side of the arc section die core, the three supporting legs are equal in length and are all in the radial direction of the pipe;

two upper supporting legs of the supporting ribs with the Y-shaped structures are fixedly connected with the die sleeve, and the lower supporting legs are fixedly connected with the die core.

The circular arc sections of the three supporting feet are concentric with the circular ring-shaped channel of the flow divider and are positioned in the middle of the circular ring-shaped channel.

After the supporting feet at the two ends of the arc section of the Y-shaped structure supporting rib are connected with the die sleeve, an arc auxiliary channel is formed between the arc section and the die sleeve.

The surface of a circular channel formed by a die sleeve, a die core and a Y-shaped structure supporting rib in the flow divider is electroplated with a hard chromium layer for preventing the polymer melt from being accumulated and decomposed.

The flow diverter is made of steel or alloy steel with relatively high hardness.

Compared with the prior art, the utility model beneficial effect be:

the utility model discloses thermoplastic pipe extrusion moulding aircraft nose shunt is through the improvement to the brace rod, all by the stranding one-tenth when making the ring form passageway of polymer melt through shunt flow through each Y shape structure brace rod

The material flow in the shape of a Chinese character 'pin' is more easily compacted in a rear-section compression area; the split flow marks of the seam line in the pipe extrusion molding are reduced, the mechanical property and the optical property of a pipe product are ensured not to be damaged, and the probability of radial linear fracture of the pipe due to hoop stress and radial impact force at the seam line of the pipe is reduced. The utility model discloses the brace rod in the thermoplastic pipe extrusion molding aircraft nose shunt can be according to tubular product diameter size and set for, at equal process conditions, adopts the utility model discloses the resistant interior pressure performance of rigid polyvinyl chloride tubular product of thermoplastic pipe extrusion molding aircraft nose shunt extrusion molding is stronger, and shock resistance is stronger, and surface optical property is better. Avoids the linear fracture of the plastic pipe due to the circumferential stress and the radial impact force to the maximum extent

Drawings

FIG. 1 is a schematic cross-sectional view of a conventional flow-through handpiece;

FIG. 2 is a schematic view of a flow splitter of the prior art flow-through handpiece of FIG. 1;

fig. 3 is a schematic structural view of the flow divider of the thermoplastic pipe extrusion molding machine head of the present invention.

Detailed Description

Example (b): as can be clearly seen from FIG. 3, the present invention provides a thermoplastic pipe extrusion molding machine head flow divider, comprising: the mold comprises a mold sleeve 51, a mold core 52 arranged in the mold sleeve 51 and used for supporting and installing the sprue spreader 3 and the mold core 4, and three Y-shaped structural support ribs 54 with similar Y-shaped cross sections and symmetrically distributed between the mold sleeve 51 and the mold core 52, wherein an annular channel 6 for flowing the hot plastic melt is formed between the mold sleeve 51 and the mold core 52.

The Y-shaped structure supporting rib 54 consists of an arc section 55, upper supporting

legs

56 and 57 connected to two ends of the die sleeve side of the arc section 55 and a lower supporting leg 58 connected to the middle of the die core side of the arc section 55, the three supporting legs are equal in length and are all in the radial direction of the pipe;

two upper supporting

feet

56 and 57 of the supporting rib of the Y-shaped structure are fixedly connected with the die sleeve 51, and a lower supporting foot 58 is fixedly connected with the die core 52.

After the supporting

feet

56 and 57 on the two ends of the circular arc section 55 of the Y-shaped structure supporting rib are connected with the die sleeve 51, an arc-shaped auxiliary channel 7 is formed between the circular arc section 55 and the die sleeve 51.

The arc sections 55 connecting the three supporting feet are concentric with the circular channel 6 of the flow divider 5 and are positioned in the middle of the circular channel 6.

The flow divider 6 is made of alloy steel with high hardness, the alloy steel with high hardness can improve the support strength of the support rib, and the surface of the annular channel 6 formed by the die sleeve 51, the die core 52 and the Y-shaped structure support rib 54 is electroplated with a hard chromium layer for preventing the polymer melt from being subjected to stagnation decomposition. The electroplated hard chrome layer on the surface of the annular channel 6 can improve the rust resistance and corrosion resistance of the mould and the wear resistance between the mould and the molten material.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of the ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, its framework form can be nimble changeable, can derive series of products. But merely as a matter of simple deductions or substitutions, should be considered as belonging to the scope of patent protection of the present invention as determined by the claims submitted.

Claims

1. A thermoplastic tubing extrusion molding head diverter comprising: mould cover and the mould core that supplies reposition of redundant personnel awl, mandrel support installation in the mould cover to and the brace rod of symmetric distribution between mould cover and mould core, form the circular ring form passageway that supplies heat to mould the melt and flow through between mould cover and the mould core, its characterized in that:

2. The thermoplastic tubing extrusion die diverter of claim 1, wherein:

the Y-shaped supporting rib consists of an arc section, upper supporting legs connected to two ends of the side of the arc section die sleeve and a lower supporting leg connected to the middle of the side of the arc section die core, the three supporting legs are equal in length and are all in the radial direction of the pipe;

two upper supporting legs of the Y-shaped structure supporting rib are fixedly connected with the die sleeve, and a lower supporting leg is fixedly connected with the die core;

an arc-shaped auxiliary channel is formed between the arc section and the die sleeve.

3. The thermoplastic tubing extrusion die diverter of claim 2, wherein:

the circular arc section of the Y-shaped supporting rib is concentric with the circular ring-shaped channel of the flow divider and is positioned in the middle of the circular ring-shaped channel.

4. The thermoplastic pipe extrusion die flow splitter as in claim 1, 2 or 3, wherein:

5. The thermoplastic tubing extrusion die diverter of claim 4, wherein:

the flow diverter is made of alloy steel.