JPH0518127Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a synthetic resin pipe manufacturing apparatus mainly suitable for manufacturing large diameter synthetic resin pipes.

(Prior art) In general, this type of resin pipe manufacturing equipment has a plurality of molding rotating shafts arranged concentrically, one end of each molding rotating shaft being cantilevered on a base, and It is slightly inclined in the circumferential direction toward the other end,
While each molding rotary shaft is interlocked and rotated by an appropriate drive device, the semi-molten synthetic resin strip supplied from the die of the press molding device is spirally wound between the molding rotary shafts. The synthetic resin tube is formed by polymerizing and adhering the opposite edges of the band-like material to be wrapped and wound, and is sent out from the free end side of the rotating shaft for forming.

However, according to such a resin pipe manufacturing apparatus, since the virtual circle formed by the plurality of rotating shafts for molding always has a constant diameter, it is possible to only manufacture synthetic resin with the same diameter as the virtual circle. Can not.

Therefore, in Japanese Patent Application No. 61-241726, the inventors of the present application made it possible to adjust the movement of each of the above-mentioned molding rotary shafts in the inner and outer radial directions to change the diameter of the virtual circle formed by these molding rotary shafts. Configure it like this,
We have developed a device that can manufacture synthetic resin pipes with different diameters.

(Problem to be solved by the invention) According to such a device, each molding rotating shaft can be moved in the outer diameter direction and adjusted to manufacture large diameter synthetic resin pipes, but the amount of movement is However, there is a problem in that if you want to manufacture a synthetic resin pipe with a slightly larger diameter, you must use a separate large-diameter resin pipe manufacturing device.

The object of the present invention is to provide a synthetic resin pipe manufacturing apparatus that solves these problems.

(Means for Solving the Problems) In order to achieve the above object, the synthetic resin pipe manufacturing apparatus of the present invention has a plurality of molding rotating shafts 1 concentrically arranged as shown in the drawings corresponding to the embodiments. While rotating these molding rotating shafts 1 disposed above, a semi-molten synthetic resin strip material 2 is released from a die 23.
4, and is configured to manufacture a synthetic resin pipe by winding it spirally so as to extend between the upper parts of the respective molding rotary shafts 1, in which each of the molding rotary shafts 1 has a desired thickness. It is characterized in that the cylindrical member 3 is removably fitted therein.

(Function) After fitting the cylindrical member 3 having a desired wall thickness onto each of the molding rotating shafts 1, the cylindrical members 3 fitted onto the molding rotating shafts 1 are driven to rotate. When the semi-molten synthetic resin strip material 24 supplied between the cylindrical members 3 is wound in a helical manner while rotating them together, the synthetic resin tube formed by the molding rotating shaft 1 Also, a synthetic resin pipe having a large diameter corresponding to the thickness of the cylindrical member 3 is manufactured.

(Example) To explain the example of the present invention with reference to the drawings, 1
denotes a plurality of rotating shafts for molding arranged concentrically at predetermined circumferential intervals, and each of these rotating shafts 1 for molding has a pair of molding shafts made of the same material as the rotating shaft 1 for molding over the entire length. A half-split cylindrical member 3 consisting of semi-cylindrical members 2, 2 is removably fitted therein.

The pair of semi-cylindrical members 2, 2 forming the half-split cylindrical member 3 are formed to have an inner circumferential diameter equal to the outer circumferential diameter of the molding rotary shaft 1, so as to be brought into close contact with the molding rotary shaft 1. At the same time, the wall thickness, that is, the thickness between the inner and outer circumferential surfaces, is the same for all the semi-cylindrical members 2 attached to the molding rotating shaft 1. And all molding rotating shafts 1
If the number of semi-cylindrical members 2 to be attached to the pipe is set as one set, a plurality of sets of semi-cylindrical members 2 each having a different thickness are prepared, and each set has a predetermined thickness according to the diameter of the synthetic resin pipe to be manufactured. It is configured to use a set of semi-cylindrical members 2.

As a means for fitting and fixing the pair of semi-cylindrical members 2, 2 to the molding rotating shaft 1, for example, the third and fourth semi-cylindrical members 2, 2
As shown in the figure, recesses 4, 4 are provided in the joint end surface of at least both ends of the semi-cylindrical member 2, and bolt insertion holes 5 are drilled through each recess 4 to the joint end surface. After fitting 2 and 2 onto one half circumference and the other half of the molding rotating shaft 1, respectively,
The opposing recesses 4 are connected by bolts and nuts 6.

Therefore, in order to remove the semi-cylindrical members 2, 2, the bolts and nuts 6 may be unscrewed.

As the molding rotating shaft 1 into which the half-split cylindrical member 3 formed by the pair of semi-cylindrical members 2, 2 is removably fitted, a well-known synthetic resin pipe with a constant diameter is manufactured. In other words, it may be a device having a structure in which a plurality of rotating shafts for molding are arranged concentrically and one end of each rotating shaft for molding is suspended on a base in a cantilevered manner. As an example, as shown in the figure, the present invention is adopted as a molding rotating shaft 1 of an apparatus capable of manufacturing synthetic resin pipes having different diameters within a predetermined range.

In this device, the drive box 7 supports the base end of the center support shaft 8, and the drive box 7 supports the center support shaft 8.
This support shaft 8 protrudes horizontally from
Several of the molding rotating shafts 1, 1...1 are arranged at predetermined intervals in the circumferential direction on a virtual concentric circle centered on , and the base end of each molding rotating shaft 1 is connected via a universal joint 9 It is rotatably supported by the bearing member 10 and connected to an appropriate rotational drive mechanism 12 via a connecting shaft 11 that can be extended, contracted and bent. Piece member 1
3, 14, and 15 are inserted and fitted so as to be slidable in the axial direction. Connecting rods 16, 17, 1 between the bearing members 10
8, which is pivotably mounted to allow bending.

Further, each piece member 13, 14, 15 is screwed into a threaded rod 19 disposed along the spindle 8.
It slides in the axial direction of the support shaft 8 by rotating the member, but only the base member 15 on the most proximal end side is screwed into the reverse threaded portion 20, so that the threaded rod 19 can be rotated. When rotated, the connecting rods 16, 17, and 18 are bent by the same amount to move all of the molding rotation shafts 1 in the inner and outer radial directions, and the diameter of the virtual circle formed by these molding rotation shafts 1 is That is, the diameter of the synthetic resin pipe to be manufactured can be changed.

In addition, an annular member 21 that can be rotated in the circumferential direction is fitted onto the top member 13 on the distal end side, and a connecting rod 16 is pivotally attached to this annular member 21.
By rotating the molding shafts 1 in the circumferential direction, the degree of inclination of each molding rotating shaft 1 in the circumferential direction can be adjusted.

With this configuration, the screw rod 19 is operated to move each of the molding rotation shafts 1 outward through the frame members 13 to 15 and the connecting rods 16 to 18, and the molding rotation shafts 1 are used to form a mold. If you want to manufacture a synthetic resin pipe with a larger diameter than the diameter of the synthetic resin pipe manufactured using the maximum diameter, set the diameter of the virtual circle that is A cylindrical member 3 is formed by fitting the cylindrical members 2 and 2 and fixing it to the outer circumferential surface of the rotary shaft 1 for molding, and then a semi-molten synthetic resin strip 24 is passed through the die 23 of the extrusion molding means 22. The material is supplied between these cylindrical members 3 and wound spirally to form a synthetic resin tube in the usual manner.

In the above embodiment, the cylindrical member 3 was formed by a pair of semi-cylindrical members 2, 2, but as shown in FIG. Alternatively, the molding rotating shaft 1 may be integrated with the molding rotating shaft 1 by being inserted thereinto.

(Effects of the invention) As described above, according to the synthetic resin pipe manufacturing apparatus of the present invention, a cylindrical member having a desired thickness is removably fitted onto each molding rotating shaft for molding a synthetic resin pipe. Since it is characterized by this, it is possible to easily manufacture a synthetic resin pipe having a larger diameter corresponding to the thickness of the cylindrical member than the synthetic resin pipe formed by the rotating shaft for molding, and in addition, By replacing the cylindrical member with a desired wall thickness, it is possible to manufacture various large-diameter synthetic resin pipes that could not be manufactured using conventional equipment, and this cylindrical member can be formed by combining a pair of semi-cylindrical members. By doing so, it can be easily attached to each molding rotating shaft.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a partially cutaway longitudinal side view, FIG. 2 is a simplified longitudinal sectional front view, and FIG. 3 is a partial side view showing the combination of semi-cylindrical members. 4 is a longitudinal sectional front view thereof, and FIG. 5 is a longitudinal sectional front view showing another embodiment of the present invention using a cylindrical member having a circular cross section. 1... Rotating shaft for molding, 2... Semi-cylindrical member, 3...
...Cylindrical member, 4...Recess, 5...Bolt insertion hole.

Claims (1)

[Scope of Claim for Utility Model Registration] A plurality of molding rotary shafts are arranged concentrically, and a semi-molten synthetic resin strip material is supplied from a die while rotating these molding rotary shafts, and each molding shaft is rotated. In an apparatus configured to manufacture a synthetic resin pipe by spirally winding the pipe over a rotating shaft, a cylindrical member having a desired thickness is removably fitted onto each of the forming rotating shafts. A synthetic resin pipe manufacturing device characterized by: 2. The apparatus for manufacturing a synthetic resin pipe according to claim 1, wherein the cylindrical member is formed by joining a pair of semi-cylindrical members at their opposing surfaces to form a cylindrical member.