JPH0116594Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention involves manufacturing a synthetic resin pipe by continuously forming a pipe body by winding a semi-molten band-shaped material in a threaded manner and sequentially overlapping and welding the side edges. Regarding equipment.

Conventionally, this kind of synthetic resin pipe manufacturing equipment has been equipped with a holding cylinder fitted concentrically around the outer periphery of a rotating shaft with a gap, and a large number of holding cylinders arranged at an angle with respect to the axis of the rotating shaft. In practical use, a holding elongated hole is bored, and a substantially cylindrical rotor, which is magnetically attracted to the outer surface of the rotating shaft and rotates as the rotating shaft rotates, is held in the holding elongated hole. It is served to. However,
In such manufacturing equipment, the rotor is rotated by the frictional force with the rotating shaft, and since it is in contact with the cylindrical surface of the rotating shaft in an inclined position, the rotor always has a rotation force proportional to the magnitude of the rotational force. A force that tries to make it parallel to the axis acts, and when used for a long period of time, the rotor gradually becomes parallel to the rotation axis due to wear of the contact area between the holding cylinder and the rotor, which causes the strip material to become spirally wound. There is a problem that the corners become loose and the overlap becomes large. Furthermore, when manufacturing a large diameter tube, there is a risk that the frictional force between the rotating shaft and the rotor alone will not be sufficient to wind up the strip material. On the other hand, in Japanese Patent Publication No. 46-12000, both ends of the rotor are pivotally supported on the holding cylinder, and a gear formed at one end of each rotor is meshed with a gear provided on the rotating shaft to rotate the rotor. A device that rotates on its own axis as the rotating shaft rotates has been proposed. However, since the rotor has bearings at both ends, the structure is complicated, and since the rotor is rotated by gears at one end, a large force is applied to the bearing at one end, which causes the bearing to If the rotor is not of high quality and precision, there is a problem that one end of the rotor will be displaced due to wear after long-term use, and the helical angle of the strip material will change.

In view of these conventional problems, the present invention has been developed so that the helical angle of the band-shaped material does not change even after long-term use, has a relatively simple structure, can obtain a large winding force, and can be used for large-diameter pipes. The object of the present invention is to provide a synthetic resin pipe manufacturing apparatus that can be applied to manufacturing without any problems.

Therefore, in the present invention, as described above, a holding cylinder is fitted concentrically with a gap on the outer periphery of the rotating shaft, and the holding cylinder has a large number of holding long holes inclined with respect to its axis. In an apparatus for manufacturing a synthetic resin pipe, the holding elongated hole holds a substantially cylindrical rotor that is magnetically attracted to the outer surface of the rotating shaft and rotates as the rotating shaft rotates, A plurality of the holding elongated holes are annularly spaced at equal intervals in the circumferential direction of the holding cylinder, and a plurality of annular rows of the holding elongated holes are formed in the axial direction of the holding cylinder, and a plurality of annular rows of the holding elongated holes are formed in the axial direction of the holding cylinder. and a portion of the outer periphery of the rotating shaft corresponding to the central portion of the holding elongated hole, and a helical gear whose projection angle between the gear axes matches the inclination angle of the rotor's axis with respect to the axis of the rotating shaft. By interlocking the mechanism, the rotational force of the rotating shaft is transmitted to the rotor as rotational force around its axis via the helical gear mechanism, and this rotational force is transmitted to the center of the rotor to rotate it. The wear of the contact area between the child and the holding cylinder is made even on both sides of the rotor in the axial direction, thus the rotor can maintain its tilted position even after long-term use, and the rotor can be rotated through gears. To provide an apparatus for manufacturing a synthetic resin pipe that can reliably wind up a band-shaped material without causing any slipping.

Hereinafter, one embodiment of the present invention will be described based on the drawings. In Fig. 1, 1 is a support base, 2 is a rotating shaft rotatably supported at one end of the support base 1, and 3 is a holding cylinder fitted around the outer circumference of the rotating shaft 2 with an appropriate gap. , one end of which is fixedly supported by the support base 1. A bearing 4 is disposed on the inner periphery of the other end of the holding cylinder 3, and the other end of the rotating shaft 2 is rotatably supported. One end of the rotating shaft 2 is connected to a rotational drive device (not shown). Reference numeral 5 denotes long holes for holding the rotor 6, which are formed in the holding cylinder 3 at an angle with respect to its axis, and a plurality of holes are arranged in a ring shape at equal intervals in the circumferential direction of the holding cylinder 3. In addition, a plurality of annular rows of holding elongated holes 5 are formed in the axial direction of the holding cylinder 3. Further, between the annular rows of adjacent holding elongated holes 5, the holding elongated holes 5 are arranged in a staggered manner such that the holding elongated holes 5 are located between the holding elongated holes 5, 5 of the adjacent row. The rotor 6 loaded into these long holding holes 5 has a substantially cylindrical shape, and has a small diameter in the center and a helical gear 7 formed therein. on the other hand,
A helical gear 8 is provided on the outer peripheral surface of the rotating shaft 2, corresponding to the center of each annular row of the holding slots 5, and this helical gear 8 meshes with the helical gear 7 of each rotor 6. There is. The rotor 6 is held by magnetism so that the rotor itself or the outer circumferential surface of the rotating shaft 2 is made of magnets so that it will not fall off when loaded in the holding slot 5. Reference numeral 9 denotes a material supply device disposed on one end of the support base 1 side of the holding cylinder 3, which feeds the semi-molten strip material 10 onto the rotor 6 along the circumferential direction of the holding cylinder 3. supply

The inclination angle of the holding elongated hole 5 with respect to the axis of the holding cylinder 3, that is, the axis O ₁ of the rotating shaft 2 in FIG.
The angle of inclination θ of the axis O ₂ of the rotor 6 relative to the outer periphery of the holding cylinder 3 is matched to the helical angle of the strip material 10 relative to the outer circumference of the holding cylinder 3, and the projection angle of the helical gears 7 and 8 is adjusted to the angle of inclination It matches. That is, the helical angle of the helical gear 7 of the rotor 6 is θ ₁ ,
The helical angle of the helical gear 8 on the rotating shaft 2 is θ ₂ , and θ=θ ₁ +θ ₂ (assuming that the helical directions are the same). Therefore, when a rotational force is applied to the rotating shaft 2, that is, the helical gear 8, in the direction of the arrow a about the axis O ₁ , a rotational force is applied to the helical gear 7, that is, the rotor 6, in the direction of the arrow b about the axis O ₂ . . Note that the helical gear 7 of the rotor 6 or the helical gear 8 of the rotating shaft 2 may have a helical angle θ ₁ or θ ₂ of 0°, that is, a spur gear.

Next, to explain the manufacturing process of the tube, when the rotating shaft 2 is rotated, the rotor 6 loaded and held in the holding elongated hole 5 of the holding cylinder 3 is moved through the meshing of the helical gear 8 and the helical gear 7. and rotate all at once within the holding slot 5. Here, when the strip material 10 is supplied from the supply device 9, this strip material 10
is guided by each rotor 6 on the outer periphery of the holding cylinder 3 and is spirally wound at a helical angle equal to the inclination angle θ. This inclination angle θ is set so that the feed pitch of the strip material 10 is smaller than its width, and the side edges of the strip material 10 are successively overlapped by a certain width and welded to each other, so that the synthetic resin tube is continuously formed. After the tube is cooled and solidified, it is sent out from the other end of the holding cylinder 3. In this manufacturing process, each rotor 6 has a helical gear 8,
Since the rotor is rotated around its axis via the rotor 7, the contact portion between the rotor and the holding cylinder is in contact with equal force on both sides of the rotor in the longitudinal direction, so even if the rotor wears out, the inclination angle θ of the rotor remains constant. does not change, allowing stable operation over a long period of time, and since it is driven by gears, there is no slipping, making it possible to manufacture large diameter pipes.

In the above embodiment, as shown in FIG. 4, the rotor 6 is loaded into the substantially rectangular holding hole 5, but as shown in FIG.
Bearings 11 made of synthetic resin or bearing metal are fitted into the semicircular parts at both ends of the rotor 6, and the support shaft 6a protruding from both ends of the rotor 6 is rotatably supported by the bearings 11. It's okay.

According to the synthetic resin pipe manufacturing apparatus of the present invention, as is clear from the above description, the rotational force of the rotating shaft is transmitted to the rotor as rotational force around its axis via the helical gear mechanism, and Since this rotational force is transmitted to the center of the rotor, the contact area between the rotor and the holding cylinder will wear evenly on both sides in the axial direction of the rotor, and the angle of inclination will remain constant even after long-term use. It has many advantages, such as being able to manufacture tubes stably without any change, and since the rotor is driven by gears, the winding force for the material is large, making it possible to manufacture large diameter tubes.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional plan view of an embodiment of the present invention.
Fig. 2 is a sectional view taken along the - arrow in Fig. 1, Fig. 3 is a partially omitted developed view showing the arrangement of the holding cylinder and the rotor, Fig. 4 is an enlarged plan view of the holding elongated hole and the rotor, FIG. 5 is an explanatory diagram of the inclination angle of the rotor of the rotating shaft and the helical gear, and FIG. 6 is an enlarged plan view similar to FIG. 4 showing a modification. 2 is a rotating shaft, 3 is a holding cylinder, 5 is a holding slot, 6
is the rotor, 7 is the helical gear, 8 is the helical gear, θ is the inclination angle, O ₁ is the axis of the rotating shaft, and O ₂ is the axis of the rotor.

Claims (1)

[Scope of utility model registration request] A holding cylinder is fitted concentrically around the outer periphery of the rotating shaft with a gap, and a large number of long holding holes are bored in the holding cylinder at an angle to the axis of the holding cylinder. To,
In an apparatus for manufacturing a synthetic resin pipe that holds a substantially cylindrical rotor that is magnetically attracted to the outer surface of the rotating shaft and rotates as the rotating shaft rotates, the holding elongated hole is formed in a circular shape of the holding cylinder. A plurality of annular rows of holding elongated holes are formed at equal intervals in the circumferential direction and a plurality of annular rows are formed in the axial direction of the holding cylinder, and the holding elongated holes are formed in the center of each rotor and on the outer periphery of the rotating shaft. and a portion located corresponding to the center of the gear are interlocked and connected by a helical gear mechanism in which the projection angle between the gear axes matches the inclination angle of the rotor's axis with respect to the axis of the rotating shaft. Synthetic resin pipe manufacturing equipment.