CN200984809Y - Internal-spiral silencing water-draining pipe extruding and forming device - Google Patents

Abstract

The utility model discloses an internal screw noise damping and draining tubular product extrusion mould, comprising a neck ring mould, a core rod, a mould core body, a middle mould body, a supporting plate, a back mould body, a principal axis and a chain wheel. A big semicircular supporting plate is arranged between the back mould body and the middle mould body; a cavity is arranged in the middle of the supporting plate; the cavity as a connection with the outside and the two sides of the cavity are provided with two flow channels which are connected with the two flow channels of the back mould body; the back end of the principal axis extends into the cavity which is arranged in the middle of the supporting plate and a chain wheel is fixed on the principal axis which is arranged in the cavity. The mould is a straight through type structure, can be manufactured on the common use tubular product production line. The principal axis connects an outer reducer through the chain wheel, then drives the core rod rotate, can save the space of the equipment; the structure is simpler and more stable, can be easily dismounted and convenient manufactured. The surface of the mould core body is opened symmetrically distributed lotus petal shaped flow channel sockets, can rationally distribute the fondant.

Description

Extrusion molding die for internal spiral sound-absorbing drainage pipe

technical field

The applicable model relates to an extrusion molding device, in particular to an extrusion molding device for an inner spiral sound-absorbing drainage pipe.

Background technique

Ordinary plastic pipes with a smooth inner wall, because the fluid flows through the smooth wall surface, produce irregular flow. At the same time, after the horizontal water flow enters the standpipe, it repeatedly collides with the pipe wall of the standpipe, resulting in air resistance in the pipe, which affects the fluidity of the fluid and the inside of the pipe. ventilation and generate noise. Plastic pipes with internal spiral ribs can effectively eliminate noise, and the preparation of plastic noise-absorbing drainage pipes with internal spiral ribs is of great significance.

Internal spiral sound-absorbing drainage pipes are usually manufactured by extruders and extrusion dies. Extrusion dies for manufacturing sound-absorbing pipes include right-angle extrusion dies and side-force straight-through extrusion dies. Among them, the right-angle extrusion die is vertical to the extrusion die, so the entire production line occupies a large area, and once the production line is fixed, it can only be used as a special production line for the spiral silencer pipe. In addition, in terms of product quality, because the side feed divides the material flow into two streams and then merges, and the compression ratio of the head is small, the weld line has a greater impact on the impact performance of the product.

The rotation of the mandrel is driven by the conical gear of the lateral power straight-through inner helical tube extrusion die, and the size of the bevel gear should not be too large due to the limitation of the thickness of the diverter plate bracket and the volume of the inner cavity of the machine head. Subject to certain restrictions, after a period of trial production, it was found that the failure rate of this machine head is very high, and because of the compact transmission structure, it is very inconvenient to disassemble and assemble, and it is difficult to ensure long-term stable production.

Therefore, the existing extruder mainly has the following defects: the right-angle extrusion die will be installed on a special production line, and the mechanical properties of the product are relatively poor. It is produced on the Internet, but due to the unstable power transmission and difficult disassembly and assembly.

Utility model content

The purpose of this utility model is to overcome the shortcomings of the prior art, to provide a kind of internal spiral sound-absorbing drainage pipe that can be produced on a general-purpose production line, has a stable power transmission system, and has a novel and reasonable flow channel structure and convenient disassembly and assembly of molds. Extrusion molding device.

The purpose of this utility model is achieved through the following technical solutions:

An inner spiral noise-absorbing drainage pipe extrusion die, including a die, a mandrel, a core body, a middle die body, a support plate, a rear die body, a main shaft, and a sprocket, and is located between the rear die body and the middle die body. Large semicircular support plate, a cavity is provided in the middle of the support plate, the cavity communicates with the outside, two flow channels are provided on both sides of the cavity, which communicate with the two flow channels on the rear mold body, and the rear end of the main shaft extends to In the cavity at the center of the support plate, and a sprocket is fixed on the main shaft located in the cavity.

The surface of the mold core body is provided with symmetrically distributed lotus petal-shaped runner grooves, and the symmetrically distributed grooves finally converge on a circular buffer groove.

A plurality of screw holes are evenly distributed on the end surface of the middle mold body, and the bracket plate is connected with the rear mold body through hexagon socket bolts.

The main shaft and the sprocket are connected by straight pins, and the sprocket located in the cavity is connected to the external reducer, and the power is transmitted, and the rotational power is transmitted to the mandrel through the main shaft.

There is an external thread on the outer end of the main shaft, and the mandrel, the seal and the mold core body are pressed tightly by a nut.

Compared with the prior art, the utility model has the following advantages:

(1) The mold of the utility model has a straight-through structure, which can be produced on a general pipe production line, saves equipment space, improves the utilization rate of the equipment, and has a simpler and more stable structure, easy disassembly and assembly, and convenient production.

(2) The main shaft of the mold is short and directly connected to the power source, so the power transmission is very good.

(3) There are symmetrically distributed lotus petal-shaped flow channel grooves on the surface of the core body. The flow channel structure is reasonable and the melt dispersion effect is good. The appropriate compression ratio can be designed according to the needs, which can better eliminate the weld line. Improve the quality of products.

Description of drawings

Fig. 1 is a structural schematic diagram of the extrusion die of the inner spiral sound-absorbing drainage pipe of the present invention.

FIG. 2 is a left side view of the bracket plate 3 in FIG. 1 .

Fig. 3 is a schematic diagram of power transmission of the utility model.

Fig. 4 is a schematic diagram of the structure of the lotus petal-shaped runner groove on the surface of the mold core body 5 in Fig. 1 .

Fig. 5 is a plane expanded view of the lotus petal-shaped runner groove structure on the surface of the mold core body 5 in Fig. 4 .

Detailed ways

In order to better understand the utility model, the utility model will be further described below in conjunction with the accompanying drawings and examples, but the protection scope of the utility model is not limited to the range expressed in the examples.

As shown in Figure 1, an extrusion die for an inner spiral sound-absorbing drainage pipe includes a die 10, a mandrel 11, a seal 8, a pressure ring 9, a pipe wall thickness adjusting bolt 12, a mold core body 5, a middle mold body 4, Support plate 3, rear mold body 1, main shaft 6, bearing 13, sprocket wheel 2 form. The main shaft 6 is connected to the mandrel 11 through an ordinary flat key, and the main shaft 6 is also connected to the mold core body 5 through a bearing 13; , from front to back are provided with die 10, front die body 7 and middle die body 4; bracket plate 3 and rear die body 1 are located behind middle die body 4; die 10, pressure ring 9, front die body 7 and middle die body The mold body 4 is connected by bolts, specifically the die 10 is pressed between the pressure ring 9 and the middle mold body 4 by hexagon socket bolts; the other end surface of the middle mold body 4 is evenly distributed to process twelve screw holes, and through Hexagon socket head bolt will be positioned at its rear support plate 3, rear mold body 1 and compress.

As shown in Figure 2, the support plate 3 is a large semicircle, and a large cavity 15 is reserved in the middle of the support plate 3, and the cavity communicates with the outside. The two flow passages of the body 1 communicate, the cavity 15 extends from the support plate 3 to the rear mold body 1, the rear end of the main shaft 6 extends into the cavity 15 at the center of the rear mold body 1 and the support plate 3, and the main shaft 6 A sprocket 2 is fixed on this end. And between the pressure ring 9 and the front mold body 7, a tube wall thickness adjusting bolt 12 is arranged.

As shown in Figure 3, one end of the main shaft 6 is fixed with a sprocket 2, the sprocket 2 is connected with the external speed reducer 21 through the sprocket 22, and the speed reducer 21 is connected with the frequency conversion motor 19 through the pulley 20 to realize power transmission. The rear die body 1 of the extrusion die 17 of the utility model is connected with the extruder main frame 16, and the tube blank extruded from the gap between the die 10 and the mandrel 11 is cooled and shaped by the auxiliary machine 18 of the extruder.

As shown in FIG. 4 and FIG. 5 , there are symmetrically distributed lotus petal-shaped runner grooves on the surface of the mold core body 5 , and these symmetrically distributed grooves finally converge on a circular buffer groove 23 . There is a triangular groove on the surface of the mandrel 5, so that a gap is formed between the core body 5, the mandrel 11, the die 10 and the middle mold body 4 connected together by the main shaft 6, and the gap is symmetrically distributed on the support plate 3. The two runners and the two runners symmetrically distributed on the rear mold body 1 communicate to form a melt runner space formed between the inlet end face and the outlet end face.

When preparing the internal spiral sound-absorbing drainage pipe, the plasticized material from the extruder host 16 enters the mold and the mold body 1 is divided into two strands, and the two strands of molten material flow through the flow channel 14 of the support plate and then enter the surface of the mold core body 5, In order to make the two streams of molten materials finally form a circular tube, and at the same time, further compact the melt, the surface of the core body 5 is designed as a lotus petal-like shunt structure, and the two streams are evenly distributed along the axial and radial directions. Distributed, after two diversions, it is divided into eight streams, and finally converges to the buffer tank area to form a circular tube. The gap between the runners behind the buffer tank is reduced to increase the pressure of the melt. In this way, the melt is in the buffer tank. It can be better and evenly distributed, so that the uniformity of pressure and velocity distribution of the melt along the hoop direction is improved. The melt then enters the auxiliary machine 18 of the extruder through the gap between the mandrel 11 and the die 10 for molding to produce a plastic sound-absorbing drainage pipe with internal spiral ribs.

The direction of melt flow in and the direction of melt flow out of the extrusion die of the utility model are on a straight line, which is a straight-through structure, so it can be installed on an ordinary pipe production line for production, so that the versatility of the machine is improved and the equipment is improved. production utilization efficiency. In terms of mechanical transmission, the transmission main shaft is directly connected with the external reducer, and the main shaft is short, so the effect of power transmission is very good. From the perspective of the overall structure of the extrusion die, the structure of this extrusion die is also relatively simple, easy to disassemble and assemble, and the structure is stable.

Claims (5)

1. An inner spiral sound-absorbing drainage pipe extrusion die, including a die, a mandrel, a core body, a middle die body, a support plate, a rear die body, a main shaft, and a sprocket. It is characterized in that it is located between the rear die body and the middle die body. There is a large semicircular support plate between the mold bodies, a cavity is provided in the middle of the support plate, the cavity communicates with the outside, and there are two flow channels on both sides of the cavity, which communicate with the two flow channels on the rear mold body. The rear end of the main shaft extends into the cavity at the center of the bracket plate, and a sprocket is fixed on the main shaft located in the cavity. 2. The inner spiral sound-absorbing drainage pipe extrusion die according to claim 1, characterized in that there are symmetrically distributed lotus petal-shaped flow channel grooves on the surface of the mold core, and the symmetrically distributed grooves finally meet in a ring on the groove. 3. The internal spiral sound-absorbing drainage pipe extrusion die according to claim 1, characterized in that a plurality of screw holes are evenly distributed on the end surface of the middle mold body, and the support plate is connected with the rear mold body by hexagon socket bolts. 4. The extrusion die for internal spiral sound-absorbing drainage pipes according to claim 1, characterized in that the main shaft and the sprocket are connected by straight pins, the sprocket in the cavity is connected with the external reducer, and the power is transmitted through the main shaft. Transmits rotational power to the mandrel. 5. The inner spiral sound-absorbing drainage pipe extrusion die according to claim 1, characterized in that there is an external thread on the outer end of the main shaft, and the mandrel, the seal and the core body are compressed by nuts.

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