阅读说明：本技术 一种热塑管材挤出成型机头分流器 (Thermoplastic pipe extrusion molding machine head shunt ) 是由 王文笔 刘涛 李振声 吴出华 于 2020-05-27 设计创作，主要内容包括：一种热塑管材挤出成型机头分流器,包括：模套和模芯,以及对称分布在模套与模芯之间的支撑筋,所述模套与模芯之间形成供热塑熔料流经的圆环状通道,其特征在于：所述支撑筋为Y形结构支撑筋；所述模套与模芯之间至少对称分布设有三个Y形结构支撑筋,Y形结构支撑筋叉口端与模套连接后形成辅助通道。所述Y形结构支撑筋可使聚合物熔料通过分流器的圆环状通道时均被分股成“品”字形料流,更容易在后段压缩区被压实；减少了管材挤出成型中接缝线的分流痕,降低了管材接缝线处因环向应力及径向冲击力导致管材径向直线破裂的几率。在同等工艺条件,采用本分流器挤出成型的硬质聚氯乙烯管材耐内压性能更强,抗冲击性能更强,表面光学性能更好。(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.)

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:

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.

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 die sleeve of the arc section and a lower supporting leg connected to the middle of the side of the die core of the arc section, 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 connecting Y-shaped supporting foot 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:

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.

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

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

Technical Field

The invention relates to a thermoplastic pipe extrusion molding machine, in particular to a thermoplastic pipe extrusion molding machine head flow divider.

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.

Disclosure of Invention

The invention aims to solve the technical problem of making up the defects of the prior art and provides the thermoplastic pipe extrusion molding machine head flow divider which can reduce the product quality problem caused by the flow dividing marks of the pipe.

The technical problem of the invention is solved by the 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 technical problem of the thermoplastic pipe extrusion molding machine head flow divider is further solved by the 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 invention has the beneficial effects that:

the thermoplastic pipe extrusion molding machine head flow divider leads polymer melt to be stranded into a material flow in a shape like a Chinese character 'pin' when flowing through each Y-shaped structure supporting rib through the circular channel of the flow divider through the improvement of the supporting rib, and 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 supporting ribs in the diverter of the thermoplastic pipe extrusion molding machine head can be set according to the diameter of the pipe, and under the same process conditions, the rigid polyvinyl chloride pipe extruded and molded by the diverter of the thermoplastic pipe extrusion molding machine head has stronger internal pressure resistance, stronger impact resistance and better surface optical performance. 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 view of a thermoplastic pipe extrusion molding head splitter according to the present invention.

Detailed Description