JPS5828103B2 - Tube manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a two-pronged strip 3 extending from a side end of a fitting strip 2 having a locking portion 1 at one end, and an inner side tip of the two-pronged strip 3. A long elastic cylindrical material 5 is extruded and formed by providing a locked portion 4 at the top and a sliding rib 12 over the entire length at the front and rear ends of the outer surface of the two-pronged band piece 3. Extrusion molding is performed continuously in machine A, and a winding guide 6 for continuously winding the cylindrical material 5 in a spiral shape is arranged in front of the extrusion molding machine A, and the winding guide 6 is slightly wider than the thickness of the bifurcated strip 3. The cylindrical material 5 is continuously inserted into the winding guide 6 of the internal width, and the locking part 1 of the fitting strip 2 is successively inserted between the adjacent bifurcated strips 3 that have already been wound. This method relates to a method for manufacturing a cylinder characterized by continuously winding a cylinder in a spiral shape, and its purpose is to continuously form a cylinder into a cylinder by continuously extruding the cylinder material by extrusion molding. The purpose of the present invention is to provide a method for manufacturing a tube that can be produced.

The present invention will be described in more detail in Example O.

A in the figure is an extrusion molding machine, and the embodiment shown in the figure is a synthetic resin extrusion molding machine.

Reference numeral 13 denotes a hopper, into which pellets are charged and the cylindrical material 5 is continuously extruded from the mouthpiece 14 of the extrusion molding machine A.

Reference numeral 15 denotes a straightening cap for straightening the tube material 5.

16 is a water tank, and 17, 18, and 19 are cutting rolls that are used to prevent (rubbing) the cylindrical material 5 from getting wet.

20 is a feed roll, 6 is a winding guide fixed at a fixed position, and 21 is a support shaft.

Here, the cylindrical material 5 extruded by the extrusion molding machine A has a bifurcated bifurcated strip 3 extending from the side end of the fitting strip 2 having a locking portion at one end, and a bifurcated strip. 3 is provided with a locked portion 4.

The winding guide 6 has an inverted U-shaped cross section with both front and rear end surfaces open, and its width on the left and right sides is slightly wider than the thickness of the bifurcated strip 3.

The front part of the winding guide 6 is made into a cylindrical material intake part 10 that becomes higher toward the front (the height of the cylindrical material intake part 10 is determined from the sum of the width of the bifurcated strip 3 and the width of the cylindrical material 5). The rear part of the winding guide 6 is made into a cylindrical material press-fitting part 9 having a height approximately twice the width of the bifurcated strip 3, and the winding guide 6 has a press-fitted cylindrical material part 9 having a height approximately twice the width of the bifurcated strip 3. The extending base T of the bifurcated strip 3 toward
: A slide projecting piece 7 that can be freely slidably engaged with the cylinder body is provided, and a two-pronged band press-fitting projecting piece 8 is provided downwardly projecting within the cylinder body intake part 10. Further, the strip press-fitting protrusion 8 is located approximately midway between the left and right widths of the winding guide 6.

Reference numeral 11 denotes a connecting piece that connects the upper end of the bifurcated strip press-fitting protrusion 8 and one side piece of the winding guide 6.

The cylinder body 5 extruded from the extrusion molding machine A passes through a straightening mouthpiece 15, a water tank 16, and then passes through cutting rolls 17, 18, 19.
At this point, the cylinder body 5 is given some play by the cutting rolls 17, 18, and 19, and then the cylinder body 5 is sent to the winding guide 6 by the feed roll 20.

First, the starting end portion of the cylinder body 5 is wound into an annular shape as shown in FIG. This ring-shaped part 2
In addition, the sliding protrusion 7 of the winding guide 6 is slidably locked on the lower surface of the extending base of the strip 3, and the forked strip press-fitting protrusion 8 is first inserted between the bifurcated strips 3 which have been wound into an annular shape. (This is press-fitted, and in this state, the cylindrical material 5 is sequentially fed into the cylindrical material intake section 10 at the front of the winding guide 6 by the feed roll 20, as shown in FIGS. 4 and 5. The sent cylinder main body 5 is pressed against the bifurcated band 3 previously wound into an annular shape by the cylinder material press-fitting section 9, and is expanded by the bifurcated band press-fitting protrusion 84 into an annular shape. The fitting strip 2 is press-fitted between the wound two-pronged strips 3, and the cylinder body 5 is sequentially wound in a spiral shape.

In this case, when extruding the cylindrical material 5 using an extrusion machine AJ trowel, sliding ribs 12 are provided protruding from the upper and lower ends of the outer surface of the bifurcated strip 3 over the entire length in the longitudinal direction. reduces the contact area of the winding guide 6,
This allows the cylinder body 5 to slide easily.

Further, the support shaft 21 is disposed near the winding guide 6 and supports the cylinder inside the cylinder formed by sequentially spirally winding the winding guide 6.

Furthermore, if the width of the bifurcated strip press-fitting protrusion 8 is made narrow, even when forming a spiral tube with a small diameter, it is possible to smoothly form a tube with a small diameter.

Therefore, the narrower the width of the two-pronged strip press-fitting protrusion 8, the better.

In addition, if the side edges of the two-pronged band press-fitting protrusion 8 are rounded, insertion becomes smoother.

In the present invention, as described above, a winding guide for continuously winding the cylinder body in a spiral shape is arranged in front of the extrusion molding machine, so that the cylinder body can be continuously extruded by the extrusion molding machine. The unwinding process and the process of winding the tube body into a spiral shape can be performed continuously, which has the advantage that the process from extrusion to forming the tube can be done continuously. An extrusion molding machine produces an elastic cylindrical body formed by extending a bifurcated two-pronged strip from the side end of the fitting strip and providing a locked portion inside the tip of the two-pronged strip. The winding guide (the locking part of the trowel fitting strip is continuously inserted between adjacent two-pronged strips to continuously wind the tube body in a spiral shape, The diameter can be freely selected when winding the main body in a spiral shape, and tubes of various sizes can be easily obtained. Furthermore, the locking part can be inserted between the bifurcated strips. Therefore, by adjusting the insertion depth of the locking part, the length of the spiral tube formed can be adjusted and it can be flexibly bent.

In addition, sliding ribs are provided at the tip and rear end of the outer surface of the two-pronged piece, and the cylinder body is continuously inserted into a winding guide whose internal width is slightly wider than the thickness of the two-pronged piece. Since the locking part of the fitting band is continuously inserted between the adjacent two-pronged band pieces that have already been wound, when the cylinder body is pushed out and wound continuously in a spiral shape by the winding guide, the winding The internal width of the winding guide is made slightly wider than the thickness of the two-pronged strip to prevent the two-pronged strip from rattling inside the winding guide and to ensure that the locking part of the fitting strip is inserted between the two-pronged strips. However, since the sliding rib comes into contact with the inner surface of the winding guide, the sliding rib reduces the contact area of the winding guide and makes it easier to slide the cylinder body. be.

Furthermore, the sliding rib reinforces the strength of the tip and rear end of the bifurcated strip, and in particular, even if the locking portion tries to slip out from between the bifurcated strips, the tip of the bifurcated strip becomes deformed and stiff, making it difficult to pull out. It has the advantage of having a role.

[Brief explanation of drawings]

Fig. 1 is a schematic overall view of the apparatus used in the method of the present invention, Fig. 2 is a perspective view of the winding guide used in the above, and Fig. 3 is a partially omitted perspective view showing the winding state of the winding guide l. Figure, 4th
The figure is an explanatory diagram showing the winding guide same as above, and Fig. 5 is the 4th figure.
6 is a partially cutaway perspective view showing the formed spiral tube, 1 is a locking portion, 2 is a fitting strip, and 3 is a bifurcated strip. , 4 is a locked part, 5 is a simple material,
6 is a winding guide, and A is an extrusion molding machine.

Claims (1)

[Claims] 1. A bifurcated bifurcated strip extends from the side end of a fitting strip having a locking portion at one end, and a locked portion is provided on the inner side of the tip of the bifurcated strip. A long elastic cylindrical material is continuously extruded using an extrusion molding machine, and the cylindrical material is formed by providing slide ribs over the entire length at the front and rear ends of the outer surface of the cylindrical material. A winding guide is placed in a continuous spiral shape, and the cylindrical material is continuously inserted into the winding guide, which has an internal width slightly wider than the thickness of the two-pronged strip, and the fitting strip is locked. A method for producing a tube, characterized in that the tube material is continuously wound in a spiral shape by continuously inserting the two-pronged strip between adjacent two-pronged strips that have already been wrapped.