JPH11165343A - Pipe having annular reinforcing ring member integraly formed on its inner peripheral surface, and method and apparatus for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for producing a pipe capable of being cut at an arbitrary position by integrally forming independent annular reinforcing ring members on the inner peripheral surface of a pipe member at a predetermined interval and not generating distortion, and being easily laid. SOLUTION: An outer die 1 continuously extruding a first synthetic resin material in a molten state into a pipe shape, an inner die 3 extruding a second synthetic resin material in a molten state in a circumferential direction inside the outer die 1 and the cutter 4 arranged between the outer and inner dies 1, 3 in an axially movable manner and closing the extrusion port 32 of the inner die 3 to cut the second synthetic resin material extruded from the inner die 3 in the circumferential direction in a molten state into an annular shape to mold a reinforcing ring member L are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is capable of cutting a pipe at an arbitrary position by integrally forming independent annular reinforcing ring members at predetermined intervals on the inner peripheral surface of the pipe member. The present invention relates to a pipe having no twist and easy to lay, and a method and an apparatus for manufacturing the pipe.

[0002]

2. Description of the Related Art Conventionally, synthetic resin pipes in which a reinforcing member is integrally formed on the inner peripheral surface of a pipe member have been used for applications such as electrical wiring protection tubes and optical fiber protection tubes in mechanical equipment and buildings.

[0003] In general, a synthetic resin pipe is formed by continuously extruding a molten synthetic resin material to form a pipe member, and forming a molten hard synthetic resin inside or outside the pipe member. The material is extruded in a spiral shape, and a spiral reinforcing member made of the hard synthetic resin material is fused to and integrated with the inner or outer peripheral surface of the pipe member.

[0004]

In this synthetic resin pipe, a helical reinforcing member made of a hard synthetic resin material is fused and integrated with the inner or outer peripheral surface of the pipe member. Although it is excellent in strength,
Since the reinforcing member is always included in the cross section of the synthetic resin pipe, there is a problem that the pipe is difficult to cut. In addition, there is a problem that the pipe is twisted by the spiral reinforcing member, which may cause difficulty in laying or the like.

In view of the above-mentioned problems of the conventional synthetic resin pipe, the present invention forms an independent annular reinforcing ring member at a predetermined interval on the inner peripheral surface of the pipe member so that the pipe member can be positioned at an arbitrary position. It is an object of the present invention to provide a pipe which can be cut with a pipe, has no twist, is easy to lay, and its manufacturing method and apparatus.

[0006]

In order to achieve the above-mentioned object, a pipe in which an annular reinforcing ring member is integrally formed on the inner peripheral surface of the present invention is a pipe formed by continuously extruding a first synthetic resin material. It is characterized by comprising a member and an independent annular reinforcing ring member which is sequentially fused and integrated on the inner peripheral surface of the pipe member.

[0007] In a pipe pipe in which an annular reinforcing ring member is integrally formed on the inner peripheral surface, since there is a cross section not including the reinforcing member in the cross section of the synthetic resin pipe, the pipe can be easily formed at that position. It can be cut, hardly twisted, and can be easily laid.

Further, according to the method of the present invention for manufacturing a pipe in which an annular reinforcing ring member is integrally formed on the inner peripheral surface, the first synthetic resin material in a molten state is continuously extruded to form the pipe member. Inside the pipe member, a second synthetic resin material in a molten state is extruded in a circumferential direction, and is cut into an annular shape to form a reinforcing ring member. The reinforcing ring member is sequentially melted on the inner peripheral surface of the pipe member. It is characterized by being worn and integrated.

In the method of manufacturing a pipe in which the annular reinforcing ring member is integrally formed on the inner peripheral surface, the independent annular reinforcing ring members are easily formed integrally with the inner peripheral surface of the pipe member at predetermined intervals. This makes it possible to easily cut the pipe at that position because the cross section of the synthetic resin pipe does not include the reinforcing member in the cross section of the pipe, and it is difficult to twist the pipe, making it easy to lay the pipe. Pipes that can be manufactured can be easily manufactured.

In this case, the inner peripheral surface of the pipe member is reinforced by expanding the diameter of the annularly cut reinforcing ring member in the circumferential direction or by expanding the pipe member and reducing the diameter in the circumferential direction. The ring members can be sequentially fused and integrated.

Thus, the reinforcing ring member can be reliably fused to and integrated with the inner peripheral surface of the pipe member, and a pipe excellent in strength and durability can be obtained.

The pitch of the reinforcing ring member can be changed by adjusting the extrusion speed of the pipe member and the time interval for cutting the reinforcing ring member.

[0013] This makes it possible to arbitrarily change the pitch at which the reinforcing ring members are formed, and to easily obtain various pipes having different strengths and flexibility.

The pipe manufacturing apparatus of the present invention for carrying out the method of the present invention, wherein the annular reinforcing ring member is integrally formed on the inner peripheral surface, continuously converts the molten first synthetic resin material into a pipe shape. An outer die to be extruded; an inner die for extruding the second synthetic resin material in a molten state in a circumferential direction inside the outer die; and an outer die and an inner die arranged so as to be movable in the axial direction between the outer die and the inner die. By closing the discharge port of the die, a cutter for forming a reinforcing ring member by annularly cutting the molten second synthetic resin material extruded in the circumferential direction from the inner die. .

In the pipe manufacturing apparatus in which the annular reinforcing ring member is integrally formed on the inner peripheral surface, since the inner die and the outer die are fixed and there is no member driven to rotate, the structure of the apparatus is simplified, and By moving the cutter disposed between the die and the inner die in the axial direction, the discharge port of the inner die is intermittently closed, and the second synthesis of the molten state extruded in the circumferential direction from the inner die. By cutting the resin material in an annular shape, the reinforcing ring member can be reliably formed.

In this case, the outer peripheral surface of the cutter is
The taper surface can be configured to have a larger diameter toward the rear.

Thus, the annularly cut reinforcing ring member can be enlarged in the circumferential direction in accordance with the axial movement of the cutter, whereby the reinforcing ring member is formed on the inner peripheral surface of the pipe member. Can be reliably fused and integrated, and a pipe excellent in strength and durability can be obtained.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a pipe having an annular reinforcing ring member integrally formed on an inner peripheral surface thereof, and a method and an apparatus for manufacturing the same according to the present invention.

FIGS. 1 to 4 show a first embodiment of a pipe manufacturing apparatus according to the present invention in which an annular reinforcing ring member is integrally formed on the inner peripheral surface.

[0020] The pipe manufacturing apparatus has a first molten state.
An outer die 1 for continuously extruding the synthetic resin material in a pipe shape, and a second molten state inside the outer die 1
By arranging the inner die 3 for extruding the synthetic resin material in the circumferential direction and the outer die 1 and the inner die 3 so as to be movable in the axial direction, and closing the discharge port 32 of the inner die 3, the inner die 3 3, the molten second synthetic resin material extruded in the circumferential direction is cut into an annular shape to form a reinforcing ring member L
The main part is constituted by the cutter 4 for molding the.

The outer die 1 includes an outer tube 1a arranged concentrically.
And the inner pipe 1b, the gap between the outer pipe 1a and the inner pipe 1b is set to be the thickness of the pipe member P, the first synthetic resin material supply passage 11 is formed, The first synthetic resin material is continuously extruded in a pipe shape. An outer tube 1a of the outer die 1 is fixed to a tip of a base 5 fixed to the apparatus main body with a bolt B via a fixing member 6, while an inner tube 1b is fixed to a fixing member 2 fixed inside the base 5. So that it is fixed to the tip. The base end of the supply passage 11 for the first synthetic resin material is closed by a sleeve 9 fixed by a fixing member 7. In this case, the outer pipe 1a and the inner pipe 1b can be replaced with members having different diameters, whereby the diameter and thickness of the pipe member P can be set arbitrarily.

The first synthetic resin material is supplied to the base end of the supply passage 11, for example, as shown in FIG.
1, but this synthetic resin material contains
Although not particularly limited, usually, a soft synthetic resin material is used to give the pipe member P the required flexibility.

The inner die 3 is formed through the supply passage 31 of the second synthetic resin material at the center and fixed to the apparatus main body 30 and a base 33 detachably attached to the tip of the fixed member 30. And a discharge port 32 opened in a circumferential direction between the base 33 and the tip of the inner die attachment 30.
The discharge port 32 communicates with the supply path 31 of the second synthetic resin material, and the second port in a molten state is formed from the discharge port 32.
Is extruded in the circumferential direction. In this case, by adjusting or exchanging the base 33, the opening width of the discharge port 32 can be changed, whereby the wire diameter of the reinforcing ring member L described later can be adjusted.

The second synthetic resin material is supplied from the base end of the supply passage 31. The synthetic resin material is not particularly limited. In order to provide rigidity and elasticity, a hard synthetic resin material is used.

The cutter 4 comprises an outer die 1 and an inner die 2
The discharge port 32 of the inner die 3 is intermittently closed by moving in the axial direction, and the second synthetic resin material in a molten state extruded in the circumferential direction from the inner die 3 is disposed. The reinforcing ring member L is formed by being cut into an annular shape. In this case, the outer peripheral surface of the cutter 4 can be formed such that the tip 41 is sharp and the rear is a tapered surface 42 having a large diameter. The diameter of the reinforcing ring member L can be reliably fused to the inner peripheral surface of the pipe member P and integrated with the inner peripheral surface of the pipe member P in accordance with the movement of the pipe member P.

As shown in FIG. 3, the cutter 4 has a base end protruding from a fixed member 2 to which the inner tube 1b of the outer die 1 is fixed, and a return spring S is interposed between the cutter 4 and the fixed member 2. Then, the cutter 4 is urged in a direction to open the discharge port 32 of the inner die 3, and a moving mechanism 8 is provided opposite to the base end of the cutter 4.

FIG. 4 shows an example of the moving mechanism 8. This moving mechanism 8 rotates a rotating body 80 provided with a plurality of rollers 8R on the outer periphery thereof around a support shaft 8S, thereby pressing the end face of the cutter 4 with the rollers 8R, and The cutter 4 is moved in the axial direction against the urging force of the spring S, and the discharge port 32 of the inner die 3 is closed by the cutter 4. In this case, by adjusting the stroke of moving the cutter 4 or by using the cutter 4 having a different taper angle of the tapered surface 42, the amount of circumferential expansion of the reinforcing ring member L cut in an annular shape is adjusted. Can be. The moving mechanism 8 can also employ a hydraulic cylinder, a pneumatic cylinder, a cam mechanism, and the like.

In this embodiment, the inner diameter of the pipe member P formed by the outer die 1 is considerably larger than the outer diameter of the reinforcing ring member L formed by the inner die 3, and the annularly cut reinforcing ring is formed. By expanding the diameter of the member L in the circumferential direction, the reinforcing ring member L is sequentially fused and integrated with the inner peripheral surface of the pipe member P, but the reinforcing ring member L is expanded in the circumferential direction. Instead of the diameter, the speed of an arbitrary take-off device (not shown) is adjusted as in the second embodiment of the pipe manufacturing device shown in FIG. 5 in which an annular reinforcing ring member is integrally formed on the inner peripheral surface of the present invention. As a result, the pipe member P formed by the outer die 1 is expanded and reduced in diameter in the circumferential direction, so that the reinforcing ring members L are sequentially fused and integrated on the inner peripheral surface of the pipe member P. You can also

Next, a method for manufacturing a pipe in which an annular reinforcing ring member is integrally formed on the inner peripheral surface by the above-described apparatus for manufacturing a pipe will be described. In the pipe manufacturing apparatus of the first embodiment shown in FIGS. 1 to 4, when a soft synthetic resin material in a molten state is supplied to the first synthetic resin material supply passage 11 of the outer die 1, the outer die 1 The pipe P is continuously formed. At the same time, a hard synthetic resin material in a molten state is supplied to the supply passage 31 for the second synthetic resin material of the inner die 3 and is extruded in the circumferential direction from the discharge port 32. When the discharge amount reaches a predetermined amount, the cutter 4 waiting at the retracted position is advanced in the axial direction by driving the moving mechanism 8, and the discharge port 32 of the inner die 3 is closed. At the same time, the second synthetic resin material in a molten state extruded in the circumferential direction from the inner die 3 is cut into an annular shape to form the reinforcing ring member L. Further, the reinforcing ring member L cut into an annular shape has a sharp tip 41 and a large-diameter tapered surface 42 on the rear side. The diameter is increased in the circumferential direction, so that the pipe member P is securely fused to the inner peripheral surface. Thereafter, the cutter 4 is driven in the axial direction by the urging force of the return spring S while driving the moving mechanism 8 to complete one stroke. Hereinafter, by repeating the same operation, a pipe in which the annular reinforcing ring member L is integrally formed on the inner peripheral surface can be manufactured.

In this case, the speed of the extrusion of the pipe member P and the time interval for cutting the reinforcing ring member L, ie,
By adjusting the time interval of one step of reciprocation of the cutter 4, the formation pitch of the reinforcing ring members L can be changed, and various pipes having different strengths and flexibility can be easily obtained.

The basic operation of the pipe manufacturing apparatus according to the second embodiment shown in FIG. 5 is the same as that of the pipe manufacturing apparatus according to the first embodiment. ), The pipe member P formed by the outer die 1
Is expanded and reduced in the circumferential direction, so that the reinforcing ring member L is sequentially fused and integrated with the inner peripheral surface of the pipe member P.
The pipe member P formed by the outer die 1 is pulled at a high speed.

In this case, the extrusion speed of the pipe member P and the time interval for cutting the reinforcing ring member L, ie,
Even if the time interval of one reciprocation of the cutter 4 is the same, the pitch at which the reinforcing ring member L is formed can be changed by adjusting the take-up speed of the pipe member P, and various pipes having different strengths and flexibility can be used. It can be obtained easily.

The pipe in which the annular reinforcing ring member L is integrally formed on the inner peripheral surface of the pipe member P thus obtained has a cross section in which the reinforcing member is not included in the cross section of the synthetic resin pipe. , The pipe can be easily cut at that position, and it has the property of being difficult to twist and being easy to lay. Therefore, the electrical wiring protection pipe and the optical fiber protection pipe in mechanical equipment and buildings It can be used in a wide range and preferably for such uses.

[0034]

According to the pipe of the present invention in which the annular reinforcing ring member is integrally formed on the inner peripheral surface, since the cross section of the synthetic resin pipe has no cross section including the reinforcing member,
At that position, the pipe can be easily cut, hardly twisted, and can be easily laid.

Further, according to the pipe manufacturing method of the present invention in which the annular reinforcing ring member is integrally formed on the inner peripheral surface, independent annular reinforcing ring members are integrally formed on the inner peripheral surface of the pipe member at predetermined intervals. Since the cross section of the synthetic resin pipe does not include the reinforcing member in the cross section, the pipe can be easily cut at that position, and the pipe is hardly twisted. Pipes that can be easily laid and the like can be easily manufactured.

The reinforcing ring member cut into an annular shape may be expanded in the circumferential direction, or the pipe member may be expanded and contracted in the circumferential direction, so that the reinforcing ring member is formed on the inner peripheral surface of the pipe member. Can be surely sequentially fused and integrated, and a pipe excellent in strength and durability can be obtained.

Further, the pitch of the reinforcing ring member is changed by adjusting the extrusion molding speed of the pipe member and the time interval for cutting the reinforcing ring member, thereby arbitrarily changing the forming pitch of the reinforcing ring member. And various pipes having different strengths and flexibility can be easily obtained.

Further, according to the pipe manufacturing apparatus of the present invention in which the annular reinforcing ring member is integrally formed on the inner peripheral surface, the inner die and the outer die are fixed, and there is no member that is driven to rotate. The structure is simplified, and the cutter arranged between the outer die and the inner die is moved in the axial direction, so that the discharge port of the inner die is intermittently closed, and the melt extruded in the circumferential direction from the inner die. The second synthetic resin material in the state can be cut into an annular shape to reliably form the reinforcing ring member.

Further, by forming the outer peripheral surface of the cutter as a tapered surface having a larger diameter toward the rear, the annularly cut reinforcing ring member can be moved in accordance with the axial movement of the cutter.
The diameter can be increased in the circumferential direction, whereby the reinforcing ring member can be reliably fused and integrated with the inner peripheral surface of the pipe member, and a pipe excellent in strength and durability can be obtained. it can.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a pipe manufacturing apparatus according to a first embodiment of the present invention in which an annular reinforcing ring member is integrally formed on an inner peripheral surface.

FIG. 2 is an explanatory view showing a step of integrally forming a reinforcing ring member on an inner peripheral surface of a pipe member by the same device.

FIG. 3 is an overall sectional view of the same device.

FIG. 4 shows a moving device of the cutter, (A) is a plan view,
(B) is a front view.

FIG. 5 is a sectional view of a main part of a second embodiment of the pipe manufacturing apparatus according to the present invention, in which an annular reinforcing ring member is integrally formed on the inner peripheral surface.

[Explanation of symbols]

 Reference Signs List 1 outer die 11 supply passage of first synthetic resin material 3 inner die 31 supply passage of second synthetic resin material 32 discharge port 4 cutter 42 taper surface P pipe member L reinforcing ring member

Claims (7)

[Claims] 1. A pipe member formed by continuously extruding a first synthetic resin material, and an independent annular reinforcing ring member which is sequentially fused and integrated with an inner peripheral surface of the pipe member. A pipe in which an annular reinforcing ring member is integrally formed on an inner peripheral surface of the pipe. 2. While continuously extruding the first synthetic resin material in a molten state to form a pipe member, extruding a second synthetic resin material in a molten state in a circumferential direction inside the pipe member, This is cut into an annular shape to form a reinforcing ring member, and the reinforcing ring member is sequentially fused and integrated with the inner peripheral surface of the pipe member. The method of manufacturing the formed pipe. 3. The reinforcing ring member cut in an annular shape is expanded in the circumferential direction so that the reinforcing ring member is sequentially fused and integrated with the inner peripheral surface of the pipe member. A method for manufacturing a pipe, wherein an annular reinforcing ring member is integrally formed on an inner peripheral surface of the pipe. 4. The pipe member according to claim 2, wherein the reinforcing member is sequentially fused and integrated with the inner peripheral surface of the pipe member by expanding and reducing the diameter in the circumferential direction. A method for manufacturing a pipe in which an annular reinforcing ring member is integrally formed on an inner peripheral surface. 5. The forming pitch of the reinforcing ring member is changed by adjusting the extrusion speed of the pipe member and the time interval for cutting the reinforcing ring member. Or a method of manufacturing a pipe in which an annular reinforcing ring member is integrally formed on the inner peripheral surface according to 4. 6. An outer die for continuously extruding a first synthetic resin material in a molten state into a pipe shape, and an inner die for extruding a second synthetic resin material in a molten state in a circumferential direction inside the outer die. And between the outer die and the inner die,
Disposed in the axial direction, and by closing the discharge port of the inner die, the second synthetic resin material in a molten state extruded in the circumferential direction from the inner die is cut into a ring to form a reinforcing ring member. An apparatus for manufacturing a pipe, wherein an annular reinforcing ring member is integrally formed on an inner peripheral surface of a pipe, comprising a cutter to be molded. 7. The cutter according to claim 6, wherein the outer peripheral surface of the cutter has a tapered surface having a larger diameter toward the rear so that the reinforcing ring member cut in an annular shape can be enlarged in the circumferential direction. An apparatus for manufacturing a pipe, wherein an annular reinforcing ring member is integrally formed on an inner peripheral surface of the pipe.