JPS582580Y2 - Manufacturing equipment for reinforced synthetic resin pipes - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an apparatus for manufacturing a synthetic resin pipe having a helical reinforcing core.

When manufacturing reinforced synthetic resin pipes, the method of forming the inner layer and outer layer in separate processes requires a large number of steps and has the disadvantage that the layers tend to separate from each other. A widely used method is to form the inner layer and the outer layer at once by supplying molten resin to the outside and inside of the molding device by moving it in parallel without rotation.

According to the latter method, in the molding device, a part of the molten resin flows inward through the gap between the helical reinforcing cores to form an inner layer, and the remaining molten resin forms an outer layer, so that the helical reinforcing cores are formed in the annular nozzle hole. The molten resin is supplied to a floating state, and the resin pressure causes the spiral reinforcing core to become eccentric or the pitch to be disturbed, resulting in the production of defective products.

In order to eliminate this drawback, a spiral groove that rotates surrounding the tip of a shaft-shaped or tubular indoor member is arranged in a molding device around which a spiral reinforcing core is wound and moved in parallel, and the spiral reinforcing core is fitted into this spiral groove. Attempts were made to feed the molten resin into the annular nozzle hole at a partial pitch by using a casing, but it was easy to cause twisting due to contact friction with the spiral groove, and the molten resin in the casing was supplied to a floating state. Even if the pitch is adjusted partially on the upstream side, the occurrence of defective products cannot be completely eliminated.

In this case, the molten resin for forming the inner layer tube is supplied through the guide member, and the inner layer and the outer layer are formed by molten resin from separate extruders without being supplied through the gap between the spiral reinforcing cores, and the guide member By eliminating the spiral groove that also served as support for the molding machine and supporting it with multiple trochanters installed on the inlet side of the molding equipment, the spiral reinforcing core is coated with molten resin without applying unnecessary external force, resulting in a high-quality reinforced synthetic resin tube. It is made possible to manufacture.

An embodiment of the present invention will be explained below with reference to the drawings. In Fig. 1, A is a resin extruder for making the inner layer, B is a resin extruder for making the outer layer, C is a molding device, and D is a manufacturing device for the spiral reinforcing core. A passage 11 for melting resin is shown at the outlet of extruder A for the inner layer.
The proximal ends of a tubular guide member 12 having a A first annular passage 15 is formed between the guide member 12 and the annular nozzle hole 16 at the tip thereof is opened to the outlet end face 17 of the molding device C. The distal end of the second annular passage 18 through which the helical reinforcing core passes between the die 14 and the distal end of the third annular passage 21 through which the outer layer molten resin provided inside the die body 20 is located outside. Annular nozzle hole 22
is opened at the outlet end face 17 concentrically with the annular nozzle hole 16.

The outlet of the extruder B for the outer layer is connected to the third annular passage 21 of the die body 20.

The inner circumferential edge 16a of the inner annular nozzle hole 16 and the outer circumferential edge 22a of the outer annular nozzle hole 22 are connected to the outlet end surface 17.
It protrudes slightly forward from three annular holes 16, 19, and 22 that are aligned and open on substantially the same plane.

A filament 1 made of metal or hard synthetic resin, which is the material of the spiral reinforcing core, is wound around a bobbin 24 that is rotatably supported on a support portion 23 that surrounds the guide member 12. The core metal 27 is wound around a guide rotor 26 protruding from a disc-shaped rotating body 25 that rotates around , and then fitted into the guide member 12 through a deformation mechanism (not shown) on the front of the rotating body 25. After contacting the outer peripheral surface in a substantially tangential direction, the core bar 27 is introduced into the forming groove 28a of the bending member 28 provided on the front surface of the rotating body 25 so as to surround a part of the core bar 27, and is bent. As the reinforcing core 2 moves around the metal 27, a pitch adjustment member 29 provided on the front side of the rotating body 25 forms a helical reinforcing core 2 with a partial pitch, and a feeding force is applied to the reinforcing core 2.

Since the helical reinforcing core 2 is fed as it is while rotating, the rotating body 25 rotatably supported on the base 30 is rotated by the transmission mechanism 31 at the same rotation speed as the helical reinforcing core 2 and in the opposite direction. .

Therefore, the helical reinforcing core 2 produced by the manufacturing equipment as described above is moved in parallel without rotating while being wound around the guide member 12 with its displacement in the circumferential direction canceled, and the casing 1 molding equipment The molten resin for the inner layer is sent out from the tip delivery hole 19 through the second annular passage 18 of C, and the molten resin for the inner layer is sent out from the annular nozzle hole 16 through the inner first annular passage 15. Immediately after exiting the outlet end face 17, the molten resin for the outer layer sent out from the annular nozzle hole 19 via the passage 18 wraps around the spiral reinforcing core 2 to form an inner layer 3 and an outer layer 4, and is taken off by a take-up device for sizing. Cooling is applied.

The guide member 12 is a rotating body 25 of the manufacturing device for the spiral reinforcing core 2.
and the extruder A, and is also supported by a plurality of trochanters 32 at the entrance of the molding device C.

In the illustrated embodiment, four trochanters 32 are arranged at equal intervals in the circumferential direction and are rotatably supported by support shafts 33, respectively, and these support shafts are supported by a disk-shaped support member 34. 3
3... is fixedly protrudingly provided.

A cylindrical portion 35 extending from the support member 34 is a sprocket 36
It is rotatably fitted and supported by the external die 14, is arranged concentrically with the guide member 12, and is rotationally driven in a direction opposite to the pitch advancing direction of the helical reinforcing core 2.

The four trochanters 32 in contact with the outer peripheral surface of the guide member 12
... are adjacent coil parts 2a, 2b, 2 of the helical reinforcing core 2
c, and the spiral metal wire 2 is placed in the middle of -
When it moves in pitch, it moves around the guide member 12 once.

Therefore, the contact points 32a, 32b, 32c between the four trochanters 32... and the guide member 12.

32d are arranged as shown in Fig. 1A, and when the helical reinforcing core 2 moves half a pitch, each trochanter 32... revolves 180 degrees and becomes as shown in Fig. 1B. Such a situation is repeated one after another.

Note that the contacts 32a... are the adjacent coil parts 2a*
2b..., but it may be shifted back and forth to the extent that it does not touch the helical reinforcing core 2.

Since the generous trochanter 32 supports the guide member 12 so as not to swing, an appropriate number of three or more is used.

As described above, in this case, the molten resin that forms the inner layer of the tube is supplied through the passage in the support member of the spiral reinforcing core, and the molten resin that forms the outer layer of the tube is supplied from its surroundings and exits the molding device. In a manufacturing device for a reinforced synthetic resin pipe whose end wraps the inside and outside of a helical reinforcing core, three or more trochanters are arranged on the inlet side of the forming device and guided between adjacent coil portions of the helical reinforcing core. This is because the member is supported and moved in one revolution when the member is pitched in the direction opposite to the direction in which the pitch advances.
Since a device for producing a spiral reinforcing core is installed between the extruder for the inner layer and the molding device, or ready-made spiral reinforcing cores of a predetermined length are stored, the guide member is relatively long and swings under the pressure of the molten resin. The trochanter prevents this phenomenon and prevents the product from being deflected by stably supporting it on one central axis.

In addition, since the trochanter is in contact with the guide member at the middle of the coil portion so as not to contact the helical reinforcing core, the helical reinforcing core can be moved without disturbing the pitch or twisting, and the exit of the forming device In addition to wrapping the end, that is, the part exposed to the atmosphere, with molten resin, the spiral reinforcing core is wrapped in molten resin without eccentricity or its pitch, resulting in a high-quality reinforced composite with constant quality. It can manufacture resin pipes.

[Brief explanation of the drawing]

Figure 1 is a front view showing an embodiment of the present invention, Figure 2 is Figure 1
- An enlarged cross-sectional view taken along the X-ray; Figure 3 is a partially enlarged vertical cross-sectional view of the molding device; Figure 4 is a partially cutaway front view of the product; Figure 5 is a view of the trochanter and its supporting member. 6 is a left side view of FIG. 5, and FIGS. 7A and 7B are developed views showing the relationship between the trochanter and the helical reinforcing core. A, B...extruder, C...molding device,
D... Helical reinforcing core manufacturing device, 11...
・Passway, 12... Guide member, 16, 22...
...Annular nozzle hole, 32... Trochanter, 34...
...Supporting member.

Claims (1)

[Scope of utility model registration request] a guide member 12 around which a spiral reinforcing core is wound and moved in parallel;
A molten resin extruder that makes the inner layer tube connected to its base end/
1 and a tip end; comprising a molding device C inserted and an extruder B for making the outer layer tube connected to the molding device C; In an apparatus for manufacturing a reinforced synthetic resin pipe in which the molten resin supplied through the passage 11 and the molten resin supplied from the periphery surround the inside and outside of the spiral reinforcing core, there are three or more on the inlet side of the molding apparatus C. The trochanters 32... are arranged to support the guide member 12 between adjacent coil parts of the helical reinforcing core, and these trochanters 32... A manufacturing device configured to be able to move in one revolution around a guide member 12 in the opposite direction.