JPH03295625A - Manufacture of screw hose with rib and its device - Google Patents

Abstract

PURPOSE:To simplify a production device and to make production method easy by a method in which the hose with necessary dimension is extruded into a extruding mold, and the tubular body extruded cylindrically in molten state is formed on said outer periphery, and the rib member extruded in molten state with rotation is wound around said periphery and is welded integrally thereto. CONSTITUTION:While the synthetic resin hose C with necessary dimension and wall-thickness whose outer periphery is covered with a reinforcing net N, is introduced in an extruding mold 3 and is extruded at a predetermined speed, a rotary body 7 is turned in the state where said turning is fitted to the pitch of the rib L formed integrally on the outer periphery of the hose in the corresponding relation to said extrusion speed. The thermoplastic synthetic resin in molten state is extruded into the material-feeding path 4 of the extruding mold 3 by necessary feeding amount and pressure with a first extruder. Consequently, the inside of the extruding mold is brought in close contact with the outer periphery of the extruded hose, and the resin is made integral with the hose so as to enclose the net. Simultaneously, when the material which becomes the rib is fed in the material-feeding path 13 by a second extruder, the semi-molten resin material is extruded into a rib-shape from the nozzle exit 9b of a rib nozzle 9 fitted to the tip through a rotary body from the path 13, thereby forming the rib L integrally.

Description

[Detailed description of the invention] [Industrial application field] The present invention is a synthetic resin drain pipe and flexible drain pipe.

The present invention relates to a method and apparatus for continuously manufacturing suction hoses and the like.

[Conventional technology]

The manufacturing method for flexible pipes (spiral pipes) made of rib material is
-17987 and 51-17988. This is a method in which a hard resin tube extruded into a desired shape is helically sheared with a rotating cutter to integrally form helical ribs on the outer peripheral surface of the tubular body.

Also, while extruding the ribbed tape, a metal tube arranged perpendicular to the extrusion direction is rotated and advanced in one direction, and the ribbed tape is wound and fused around this to form 11 spiral tubes. There is a way.

[Problem to be solved by the invention]

In the method of shearing a part of the tube extruded by rotation of a cutter, the spiral rib is solid and the cross-sectional shape is square, and the cross-sectional shape of the rib cannot be arbitrarily selected.
If the sheared surface is angular and the diameter is large, it will be heavy.

In addition, in the ribbed tape wrapping method, the rib material is wrapped around the outer periphery of the tubular body that is extruded while rotating, so there is no unreasonable manufacturing process.
It has the advantage of being able to manufacture accurately, but the equipment is large and requires a lot of effort to feed the metal tube, and since the product is rotating, it is difficult to wind up, cut, etc. in the next process. The disadvantage is that the device is inevitably complicated and large, and the cost is high.

In view of these drawbacks, it is an object of the present invention to simplify the manufacturing apparatus and method to easily manufacture a hollow or solid spiral rib material spiral tube.

[Means to solve the problem]

The present invention has been made to achieve the above object, and is a tubular body in which a hose covered with a reinforcing net is extruded through an extrusion mold at a required speed, and a synthetic resin material is formed on the outer peripheral surface of the hose in a molten state. The outer periphery of this extruded tubular body is rotated relative to the extrusion speed of the tubular body, and the raw material is rolled into a tubular shape by continuously extruding it into a tubular shape to have the required diameter and wall thickness. The gist of this method is to integrally form ribs in a spiral shape by winding molten rib material extruded from a ribbed metal nozzle that rotates together with a rotating body.

〔Example〕

The present invention will be explained below based on the illustrated embodiments.

In the figure, l denotes an inner cylinder having a necessary inner rod so that a hose manufactured by another manufacturing machine or a hose whose outer periphery is covered with a reinforcing net as necessary is inserted, and 2 denotes an inner cylinder. The outer cylinder is integrally fitted with each other so that a tubular material delivery passage 4 is formed between the inner and outer parts 1 and 2,
The extrusion die 3 is constituted by both the inner and outer cylinders.

The extrusion mold 3 is fitted into the frame F. The mounting flanges 1a and 2a provided at the proximal ends of the inner cylinder 1 and outer cylinder 2 are fitted into the mounting grooves under the frame, and a clamping plate is attached to the outer end surface. 12, tighten the mounting bolts IB and attach the mounting flange 1a, 2a.
is clamped and fixed between the clamping plate frames. At this time, a plurality of centering bolts IA and IA are provided on the frame so that the inner cylinder 1 and the outer cylinder 2 are fitted and fixed concentrically.
Thereby, a cylindrical material delivery passage 4 is formed between the inner and outer cylinders.
The thickness should be uniform over the entire circumference.

Then, material is supplied from the material supply port 3A provided on the rear end side of the extrusion mold 3 or at any position on the outer periphery, and the supplied material is placed on the front end surface so as to cover the outer periphery of the assembled hose extruded from the inner cylinder. A pipe cap 5 is provided to extrude the pipe into a tubular shape, and the diameter of the pipe cap 5 is predetermined to be the diameter of the tubular body to be manufactured, that is, the outer diameter. The spiral tube thus formed is a double pipe type in which a mesh N is built in between a hose C on the inside and an outer hose P formed by the pipe cap on the outside. It becomes a spiral tube. In this case, the extrusion speed of the material can be variably adjusted. Further, the rear half of the extrusion mold 3 is fitted and supported within the frame F, and a rotating body 7 is rotatably provided on the outer periphery of the first half, and a tin rocket wheel 8 or a gear is fixed to the rotating body 7. The rotating body 7 is driven by the power so that it can be variably adjusted relative to the extrusion speed at which the material is extruded from the nozzle opening 5N of the extrusion die.

This rotating body 7 is supported within the front frame Fa via a bearing 6, and the sprocket wheel 8 is attached to this rotating body 7.
is fixed with a key.

Furthermore, a rotating mold 11 is fitted and fixed inside the rotating body 7 so as to be interposed between the rotating body 7 and the outer cylinder 2, and a tubular mold is inserted between the inner peripheral surface and the outer peripheral surface of the outer cylinder 2. A material delivery passage 13 is formed, the material is supplied from the material supply port 3B, and the material sent out from this passage 13 forms a spiral rib L on the outer periphery of the flexible tube.

As shown in FIGS. 2 to 4, this rotary mold 11 has a cylindrical shape that fits into the material delivery passage 13 for the ribs, and one end thereof, that is, the side opposite to the nozzle, is shown in FIGS. 2 and 4. As shown in FIG. 2, a through hole 11a is provided, which has a tapered surface, is inclined toward the nozzle side, and has approximately the same area as the nozzle opening 9a of the lip cap 9. Therefore, the material supplied into the material delivery passage 13 moves toward the nozzle port 9a side of the rib nozzle under the supply pressure. At this time, when the material delivery passage 13 moves from the anti-nozzle side to the nozzle side, the passage 13
The material delivery path is gradually narrowed due to the shape of the tapered end surface 11b of the rotary mold 11, and the material is finally delivered from the nozzle opening 9a having approximately the same cross-sectional area as the nozzle opening. Therefore, the pressure exerted on the material delivered through the material delivery passage is applied to the rotating body 7 and the bearing 6 via the rotating mold 11.
No pressure is applied to the ribbed metal 9 at the tip of the supported plate.

In addition, a ring-shaped alloy bushing 12 is fitted inside the rotating body 7, and this bushing 12 serves as a rotating sliding surface between the rotating body and the frame, so that the rotating body 7 rotates with respect to the frame. When doing so, make sure that the frame and rotating body do not slide directly.

A ribbed metal 9 is fixed to the tip of the rotary body 7 with a mounting bolt 10, and the ribbed metal 9 has a hole at the same position as the through hole 11a of the rotary mold 11 on its base end side, that is, on the joint surface with the rotary body. A nozzle opening having a certain area and shape is bored, and a rib-shaped nozzle outlet 9b is provided on the inner circumferential surface, and the inner circumferential surface of this ribbed metal 9 is the outer circumferential surface of the semi-molten resin sent out from the pipe cap. The semi-molten resin extruded from the nozzle outlet 9b is spirally wound at the required pitch around the outer peripheral surface of the extruded pipe-shaped resin. Make sure that everything is cohesive.

A sprocket wheel 8 is fixed to the outer circumference of the rotating body 7 with a key, and a bearing, that is, an inner ring 61 of the bearing is fitted, and this inner ring 61 is fixed to the outer circumferential surface of the rotating body with a fixture 6a. The outer ring 62 fits into the inner recess of the inner frame Fa and is fixed to the inner frame with a fixture 6b. Therefore, the rib cap 9 fixed to the tip of the rotating body 7 is rotated together with the rotating body 7 at a predetermined rotational speed, but the pipe cap 5 does not rotate because it is fixed to the stationary side.

Note that the outer peripheral surfaces of the frame F, front frame Fa, and rib cap 9 are heated by a heater H as necessary so that the materials sent out from the nozzles through the material delivery passages 4 and 13 can be maintained in a semi-molten state.

In addition to the shape of the rib cap 9 as shown in the figure,
The shape may be U-shaped, semicircular, crank-shaped, spoon-shaped, or any other shape depending on the external shape of the solid rib or hollow rib to be formed, but the material extruded from the nozzle outlet 9b is transferred to the nozzle opening of the pipe fitting. When the rib-shaped body of the tubular body facing the outer peripheral surface of the tubular body extruded from 5N and still in a molten state is fused and integrated, the inside of this rib-shaped body is attached to the outer peripheral surface of the tubular body. Make contact.

By changing the shape of the nozzle outlet 9b, the cross-sectional shape of the solid or hollow flexible tube with a wap manufactured by the present invention can be varied in various ways, and this can be used depending on the application. The width and height of the rib depends on the size of the nozzle opening.

The external shape is determined.

In the apparatus configured as described above, manufacturing of the ribbed spiral tube will be explained next.

A synthetic resin hose C with a required diameter and wall thickness, whose outer periphery is covered with a reinforcing net N as necessary, is guided into the extrusion mold 3, extruded at a predetermined speed, and the hose is The rotating body 7 is rotated in a relative relationship with the hose extrusion speed in accordance with the pitch of the ribs L integrally formed on the outer periphery. Then, when the thermoplastic synthetic resin material is supplied into the material delivery passage 4 of the extrusion mold 3 by the first extruder in a state where it is melted or becomes molten in the middle from a material supply device (not shown), the material is The passage reaches the required extrusion speed depending on the supply amount, pressure, etc., and the nozzle port 5N at the tip of the passage
pushed out more. As a result, it comes into close contact with the outer periphery of the hose being extruded through the extrusion mold, and becomes integrated with the hose like a mesh. At the same time, when a material, such as hard resin, is supplied to the second extruder to become the material delivery passage 13, it passes through the rotary body 7 from this passage 13 and is semi-melted into a cylinder from the nozzle outlet 9b of the ribbed gold 9 attached to the tip. Extruded ribs L are integrally formed. Further, when the material for forming the ribs supplied by the material delivery pressure 13 is extruded to a required thickness while rotating with the rotating body, it is formed into a cylindrical shape along the Taber end surface 11b of the rotary mold 11 fitted inside the rotating body. The supplied material flows and is guided through a through hole 11a that is bored at only one location on this tapered end surface 11b. At this time, the pressure due to the feeding of the material is supported by the rotating body and bearings via this rotating mold.

Since the nozzle opening 9a of the rib-brown metal 9 is connected to this through-hole 11a, the material has the cross-sectional shape of the nozzle opening 9a and is transferred to the rib base 9. From the tag nozzle 9b, the material becomes a rib-like shape with the desired cross-sectional shape, and It is extruded while rotating around the outer periphery of the cylindrical body. Since the material forming the rib at this time is in a semi-molten state, the two are fused and integrated at the position exiting the nozzle outlet. At this time, the pitch of the ribs is determined by the relative relationship between the extrusion speed of the tubular body and the rotational speed of the rotating body, and the ribs L are continuously wound around the outer periphery of the tubular body to manufacture a spiral tube. In this case, the tube body can be manufactured according to the purpose depending on the type of material extruded from each passage. For example, the first. By using a hard synthetic resin as the material supplied from each passage 4.13 by the second extruder, it is possible to use a rigid pipe without flexibility or a drainage pipe in place of a humid pipe. Flexible pipes, suction hoses, etc. can be manufactured by extruding the soft synthetic resin from the passage 4 in the second extruder, and the hard synthetic resin from the passage 13 in the second extruder. This determines the shape of the tubular body to be formed.

〔Effect of the invention〕

According to the present invention, a hose of a required diameter is extruded through an extrusion mold, and a tubular body is formed on the outer periphery of the hose by straightening it in a molten state without turning and extruding it into a cylindrical shape. Because the rib members extruded in a molten state are wrapped around each other and fused to form a single body, the tubular body does not rotate as much as the conventional manufacturing method, in which the tubular body is rotated and the ribs are wrapped around the outer circumference of the tubular body. Therefore, a winding device is used in the post-process.

There are advantages that the cutting device can have a simple structure, that the product can be of uniform quality without twisting, and that ribbed spiral tubes can be manufactured easily and continuously.

Furthermore, when the material forming the ribs passes through the passage inside the rotating body,
The rib is squeezed into a shape close to the cross-sectional shape of the rib using a rotary mold, and the rib mouthpiece provided at the tip of the extrusion mold is not subjected to material delivery pressure, so the gap between the joint surface between the extrusion mold and the rib-blowing mold is reduced. This has the advantage of being able to prevent leakage of raw materials, thereby preventing the occurrence of flakes due to wet raw materials, and maintaining uniform product value.

[Brief explanation of drawings]

Figure 1 is a sectional view, Figure 2 is a broken external view of the rotating body, Figure 3 is a plan view of the same, Figure 4 is a developed view of the rotary mold, Figure 5 is a sectional view of the ribbed tube, and Figure 5 is a cross-sectional view of the ribbed tube. FIG. 6 is an explanatory diagram of the pipe cap. 1 is an inner cylinder, 2 is an outer cylinder, 3 is an extrusion mold, 4.13 is a material delivery passage, 5 is a pipe mouthpiece, 5N is a nozzle opening, 6 is a bearing,
7 is a rotating body, 8 is a sprocket wheel, 9 is a rib cap, 9a, 9b are nozzle ports, 10 is a bolt, C is a hose, N is a mesh, P is an outer hose, and L is a rib.

Claims (2)

[Claims] (1) A hose covered with a reinforcing net is extruded through an extrusion mold at the required speed, and a synthetic resin material is formed on the outer circumferential surface of the tube in a molten state so that it has the required diameter and wall thickness. The outer periphery of the extruded tubular body is rotated relative to the extrusion speed of the tubular body, and the raw material is changed from a cylindrical shape to a rib shape and rotates with the rotating body. 1. A method for manufacturing a ribbed helical tube, characterized in that ribs are integrally formed in a spiral shape by winding molten rib material extruded from a nozzle. (2) A cylindrical material delivery passage is provided between the inner cylinder and the outer cylinder, which are fitted concentrically to each other and fixed so that a hose with a reinforcing net fitted on the outer circumferential surface is inserted and pushed out. The formed extrusion mold, the pipe cap which is fixed to the tip of the extrusion mold and which extrudes the melted material onto the outer periphery of the hose to integrally wrap the mesh to form a tubular body of a desired diameter; It consists of a rotating body that is able to fit together with the extrusion die and that forms a material delivery passage that forms a rib between it and the extrusion die, and a bearing that is rotatably attached to the outer periphery of this rotating body and supported by the frame. A rotary mold is provided which is fitted into a material delivery passageway in the body and has an inclined end surface so as to guide the material delivered through the passageway to a through hole for forming a rib shape or a shape similar to the rib shape. A manufacturing device for a ribbed helical tube has a rib cap that forms a rib fixed to the tip of the rotating body.