JPH0358578B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a resin pipe manufacturing apparatus that is suitably used mainly for manufacturing large diameter resin pipes.

(Prior Art) In general, this type of resin pipe manufacturing apparatus has a plurality of molding rotating shafts arranged on a virtual cylinder, and one end of the molding rotating shaft is cantilevered on a base. At the same time, each rotating shaft is interlocked and connected to a drive device, and the forming rotating shaft is slightly inclined with respect to the axis of the virtual cylinder. The band-shaped material is wrapped so as to extend over each molding rotating shaft, one edge of the material is polymerized and bonded, and in this state, each molding rotating shaft is simultaneously driven by a drive device. The resin tubes are successively molded and fed out from the free end side of the molding rotating shaft.

(Problems to be Solved by the Invention) By the way, in the resin pipe manufacturing apparatus having the structure as described above, it is not possible to change the diameter of the resin pipe to be molded. is easily displaced. That is, in this type of large-diameter pipe, a large load acts on the forming rotating shaft, but if the forming rotating shaft is supported in a cantilevered manner on the base as described above, it is difficult to counteract this load. As a result, the support of each molding rotating shaft is deformed, and there is a problem that reliable tube molding cannot be performed.

(Means for Solving the Problems) The present invention was invented to solve the above-mentioned problems, and includes rotatably supporting an operating shaft by a base and a face plate that are arranged opposite to each other. A plurality of molding rotary shafts are arranged on a virtual cylinder centered on this operating axis, and each molding rotary shaft is interlocked and connected to a drive device via a connecting shaft that can be extended, contracted, and bent. At least two rotating shafts are provided on the operating shaft that move in the axial direction by the rotation of the operating shaft.
pieces are fitted at predetermined intervals, and these pieces are made to support each of the molding rotating shafts via connecting rods so as to be movable in the radial direction, and the operating shafts are rotated. The present invention is characterized in that the molding rotating shaft is configured to move in the radial direction.

(Function) According to the above configuration, the operating shaft is supported on both sides by the base and the face plate, and each molding rotation shaft is supported on both sides via the connecting rod by the piece member fitted to the operating shaft. Since they are supported in a vertical manner, during tube forming, each of the forming rotary shafts sufficiently resists the large load that is applied and is not inadvertently displaced, so that reliable tube forming can be performed. In addition, when the supporting position of the piece member on the operating shaft is moved in the axial direction of the operating shaft by rotating the operating shaft, the connecting rod swings in conjunction with this, and each molding rotation Since the shaft moves in the radial direction and, along with this movement, the connecting shaft expands, contracts, and bends to transmit the drive rotation of the drive device to the forming rotating shaft, the diameter of the tube to be formed can be freely changed.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

In the figure, numeral 1 is a base, 2 is a face plate,
The face plate 2 is disposed facing the base 1 at a predetermined interval in front of the base 1, and is fixedly supported by the base 1 via a large number of support rods 3. It is arranged. This operating shaft 4 is the base 1
It is rotatably supported via bearings 5 and 6 provided on the front wall 1a and the face plate 2, and a plurality of molding rotating shafts 7 are arranged on a virtual cylinder centered on the operating shaft 4.
...is placed.

The molding rotating shaft 7 consists of a long shaft 7a with a large diameter and a first bearing member 8, and a short shaft 7b with a small diameter and a second bearing member 9. 7b via a universal joint 10, and the long axis 7a is slightly bent with respect to the short axis 7b by the universal joint 10, so that the long axis 7a is slightly inclined with respect to the operating axis 4.

On the other hand, the operating shaft 4 has a first threaded groove 11a formed at its tip, and extends over a required length on both sides of the bearing 6 of the face plate 2 on one side, which is the same as the first threaded groove 11a. A second threaded groove 11b in the direction is formed, and the other threaded groove 11a,
A third screw groove 11c is formed in the opposite direction to the third screw groove 11b, and each of these screw grooves 11a, 11b, 1
1c, the first to third frame members 12a, 12, respectively.
b, 12c are screwed together, and by rotating the operating shaft 4, the first and second frame members 12a, 12b are screwed together.
and the third piece member 12c are configured to move toward or away from each other in the axial direction. The mechanism for rotating the operating shaft 4 may have any structure, but for example, while the driven gear 13 is attached to the proximal end of the operating shaft 4 as shown in the figure, the mechanism for rotating the operating shaft 4 may be attached to the driven gear 13 and an operation not shown. A timing belt 14 may be stretched over the gear so that the operating shaft 4 is rotated by rotation of the operating gear.

The first to third frame members 12a, 12b, 12
c has two one pair of first to third connecting rods 15a...15
One end portion of b...15c... is pivotally attached so as to be swingable. The other ends of the first connecting rods 15a are pivotally connected to the first bearing member 8, and the second and third connecting rods 15a...
The other ends of 5b...15c...
It is supported so as to be movable in the radial direction. Also, a first piece member 12a screwed onto the tip of the operating shaft 4
is configured to be able to be arbitrarily angularly displaced in the radial direction with respect to the axis of the operating shaft 4. That is, a tubular body 17 inserted into the operating shaft 4 is fixed inside the support plates 16 radially attached to the face plate 2, and an inner cylindrical body inserted into the operating shaft 4 is fixed to the tip of the tubular body 17. 18 is fixedly supported, and an outer cylinder body 19 is fitted onto the inner cylinder body 18, and spline grooves are formed on the fitting circumferential surfaces of both cylinder bodies 18 and 19 that face each other, and the fitting between these spline grooves is performed. The outer cylindrical body 19 is connected and fixed to the first piece member 12a, with only axial movement possible depending on the case. By inserting the first connecting rod 15a into the inner cylindrical body 18 at an arbitrary angle displacement, the first connecting rod 15a is connected to the second and third connecting rods 1.
5b, 15c around the axis of the operating shaft 4, thereby changing and adjusting the inclination angle of the molding rotating shafts 7 with respect to the operating shaft 4.

Note that a support plate 20 is attached to the face plate 2 on the opposite side of the support plate 16, and regulation plates 21 and 22 provided on both support plates 16 and 20...
Due to the presence of the second and third frame members 12b, 12
c is restricted from moving away from each other.
Reference numeral 23 is a radial elongated hole provided in the face plate 2, into which the second bearing member 9 is inserted, and when the molding rotating shaft 7 moves in the radial direction. It serves as a guide.

The molding rotating shafts 7 are operatively connected to a drive device M. That is, each of the short shafts 7b of the molding rotating shafts 7 is connected to the universal joint 24 fixed to one end of the connecting shaft 26 by spline fitting or the like so that it can slide in the axial direction and transmit rotation. At the same time, the universal joint 25 fixed to the other end of the connecting shaft 26 is connected to the driven shaft 2.
A small gear 28 connected to the driven shaft 27 and fixedly inserted into the driven shaft 27 is engaged with a large gear 30 supported via a bearing 29 provided on the rear wall 1b of the base 1, The large gear 30 is interlocked and connected to the output shaft of a drive device M, and the power from the drive device M is transmitted to each molding rotating shaft 7...
are driven all at once in the same direction.

In the above configuration, the die 3 of the extrusion molding device 31
The semi-molten strip material a supplied from 2 is wound so as to span the upper part of each molding rotating shaft 7, and its one side edge is polymerized and bonded, and in this state, each molding rotating shaft 7... are simultaneously driven by the power from the drive device M, the strip-shaped material a is formed into a tubular shape and is sequentially fed out from the side opposite to the base 1. In addition, if the pipe diameter is large, the strip material a may harden and be unable to be bonded by the time it reaches the overlapping position, but in such a case, the strip material a may be reheated with a heating device not shown before the overlapping position. Just do it.

When changing the pipe diameter of the resin pipe to be molded, the operating shaft 4 is rotated by the operating gear, and the first and second piece members 12a, 12b and the third
The piece members 12c are moved in the direction of approaching or separating from each other, and thereby the first to
The rising angle due to the swinging of the third connecting rods 15a...15b...15c... is displaced, and each molding rotation shaft 7...
move radially outward or inward, and the diameter of the resin tube to be molded by each molding rotating shaft 7 is changed as appropriate.

In addition, in the embodiments described above, the present invention makes the first connecting rod 15a slightly longer or shorter than the second and third connecting rods 15b, 15c, etc., to ensure reliable feeding of the molded resin pipe. You may also do so. That is,
If the first connecting rod 15a is a little long, the outer diameter of the molding rotating shaft 7 on this side will be large, providing reliable feeding when molding a resin pipe using a strip-shaped material that hardens quickly. Also, if the first connecting rod 15a... is a little short, the outer diameter due to the molding rotating shaft 7... on this side will be small, which will cause resistance when molding a resin pipe using a strip-shaped material that shrinks during curing. Smooth delivery can be achieved without giving any lag.

In addition, as another method for reliably sending out this resin pipe, the first to third connecting rods 15a, 15
b, 15c are all the same length, and the screwing position of the first connecting rod 15a with the first threaded groove 11a is set so that the screwing position of the first connecting rod 15a with the first threaded groove 11a is the same as that of the second and third connecting rods 15b, 15c with the second and third threaded grooves 11b, 11c. By shifting the screwing position by a predetermined number of pitches with respect to the screwing position, the rising angle due to the swing of the first connecting rod 15a can be adjusted to that of the second and third connecting rods 15.
It may be always made larger or smaller than those of b and 15c.

Furthermore, as a means for changing and adjusting the inclination angle of the molding rotating shaft 7 with respect to the operating shaft 4, in addition to the structure described above, for example, although not shown, the outer cylinder 19 is attached to the inner cylinder 18 in the circumferential direction. After fixing only to
A joining flange 17 between the tube body 17 and the inner cylinder body 18
A, 18a is formed with arc-shaped elongated holes at multiple locations along the circumferential direction of the flange 17a or 18a, and the other is formed with a plurality of bolt insertion holes corresponding to each elongated hole. The inner cylindrical body 18 is butted against the tubular body 17 at an arbitrary angle within the range where the long holes and each bolt insertion hole overlap, and each long hole and each bolt insertion hole are respectively tightened with bolts. It may also be a fixed structure.

(Effects of the Invention) As explained above, according to the present invention, the operating shaft is supported on both sides by the base and the face plate, and each molding rotation shaft is connected by a piece member fitted to the operating shaft. Since it is supported on both sides via rods, each molding rotating shaft is supported extremely reliably, and even large-diameter resin pipes can be molded accurately and continuously. In addition, by rotating the operating shaft, the supporting position of the piece member on the operating shaft is moved in the axial direction, thereby swinging the connecting rod, thereby extremely moving the radial direction of each molding rotation shaft. Since this process is easy to perform, it has become possible to freely and easily change and adjust the diameter of the resin pipe to be molded.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a plan view when the position of each molding rotation shaft is enlarged in the radial direction, Fig. 2 is a side view thereof, and Fig. 3 is a plan view of the position of each molding rotation shaft. FIG. 3 is a longitudinal cross-sectional view when the position of the rotating shaft is reduced in the radial direction. DESCRIPTION OF SYMBOLS 1... Base, 2... Face plate, 4... Operating shaft, 7... Rotating shaft for molding, 12a, 12b, 12c... Top member, 1
5a, 15b, 15c... connecting rod, 26... connecting shaft,
M...Drive device.

Claims (1)

[Claims] 1. An operating shaft is rotatably supported by a base and a face plate that are arranged to face each other, and a plurality of molding rotating shafts are arranged on a virtual cylinder centered on this operating shaft, and each molding rotating shaft is are interlocked and connected to a drive device via bendable connecting shafts to simultaneously drive each molding rotating shaft in the same direction, while the actuating shaft is moved in the axial direction by rotation of this shaft. At least two piece members are fitted at a predetermined interval, and these piece members support each of the molding rotating shafts via a connecting rod so as to be movable in the radial direction, and the rotation of the operating shaft is controlled. A resin pipe manufacturing apparatus characterized in that the apparatus is configured to move the molding rotating shaft in the radial direction.