JPH0129673B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for continuous production of perforated synthetic resin pipes, particularly culvert drainage pipes.

When carrying out civil engineering work that involves embankment, backfilling, etc., so-called culvert drainage works, which provide water passages in the soil to ensure smooth drainage of water, are constructed at the same time. As this culvert drainage construction method, a method is often adopted in which a pipe with a large number of through holes in the surrounding wall is buried in the soil, and water that enters through the through holes is discharged to the outside through the inside of the pipe. Corrugated pipes made of synthetic resin are widely used as pipes for such underdrain drainage because they can be manufactured in large quantities at low cost, there is no risk of rusting, and they have sufficient buckling strength against earth pressure. It is used. This corrugated pipe is made by extruding a heat-softened thermoplastic synthetic resin tube from an extrusion nozzle and expanding it in the centrifugal direction using air pressure injected into the tube, and causing it to reach the inner wall of a molding frame, which has regular irregularities. It is manufactured continuously by molding and turning the molded frame into a mold block, and the above-mentioned through holes are appropriately punched from the outside of the tube after molding by punching with a punch-type cutter. However, in this method of drilling holes, the cutter punches out in the centripetal direction of the pipe, so the cut sections remain inside the pipe, especially in corrugated pipes with uneven pipe walls. It is difficult to completely remove these sections, and if they are buried as they are, the remaining sections may cause blockages in waterways or block through holes, significantly reducing the intended drainage function. , drastic improvements were strongly desired.

The present invention has been made in view of the above, and when drilling a through hole, a cutter is applied outward from the inside of a molded pipe, and at the same time suction is applied from the outside to remove the cut section. The purpose of this invention is to eliminate the above-mentioned problems by quickly removing them without leaving them in the pipe.

Embodiments of the present invention will be described based on the accompanying drawings.
FIG. 1 is a vertical cross-sectional view of essential parts showing an example of the device of the present invention;
FIG. 2 is an enlarged view of the portion lined in FIG. 1. That is, the present invention provides a synthetic resin pipe 3 manufacturing apparatus that continuously extrudes a thermoplastic synthetic resin 30 from an extrusion nozzle 1 along a mold 2. A punch-type cutter 4 acting on the pipe wall of the synthetic resin pipe 3 from the inside to the outside is disposed, and a driving means 5 for intermittently operating the cutter 4 is installed coaxially with the extrusion nozzle 1. On the other hand, on the outside of the synthetic resin pipe 3, a cutter 4 is attached to a portion corresponding to the cutter 4.
A cylindrical cutter guide 6 capable of accepting The cutters 4 are operated intermittently to sequentially drill through holes 31 in the wall of the pipe 3, and the cut sections 32 are transferred to the cutter guide 6.
This is a continuous manufacturing device for perforated synthetic resin pipes, characterized in that the perforated synthetic resin pipes are removed by suction through... FIG. 1 shows a continuous manufacturing apparatus for corrugated pipes, in which a plurality of mold blocks 2 are assembled into two endless block assemblies 20, 2.
0, these assemblies 20, 20 are run under cooperative regulation, and a molding zone 200 is formed in which both of them meet within a certain range, and the molding zone 20
Thermoplastic synthetic resin extrusion nozzle 1 inserted into 0
A corrugated pipe is continuously manufactured by expanding a thermally softened synthetic resin pipe in the centrifugal direction using compressed air pressure and bringing it to the inner surface of the formwork 2. That is, the extrusion nozzle 1 is used to extrude synthetic resin 3 in a thermally softened state introduced from outside the system (shown in the figure).
0 annular passage 11 and an annular air supply passage 1 for compressed air introduced from outside the system (shown in the figure) into the inside thereof.
2 coaxially, a stopper 13 is integrally held in front of the nozzle 1, and the softened synthetic resin pipe extruded from the annular passage 11 is connected to the air supply passage 1.
2, the plug body 13 is
The corrugated pipe is expanded in the centrifugal direction in the space leading to it, and is molded to the inner wall of the formwork 2, which is provided with alternating small diameter parts and large diameter parts, and as the block assemblies 20, 20 move in the direction a, the corrugated pipe 3 are produced continuously. This corrugated pipe 3 has through holes 31 bored at the exit of the molding zone 200, which will be described in detail below with reference to FIG. 2.

At the tip of the stopper 13, two holding members 40 for the cutter 4 are fixed at positions 180 degrees apart from each other, and the holding members 40, 40 are provided with springs 4.
Punch type cutters 4, 4 which are biased in the centripetal direction by 1, 41 are loaded, and the cutting edges of the cutters 4, 4 are close to the inner wall of the small diameter portion of the corrugated pipe 3. Further, a driving means 5 for operating the cutters 4, 4 in the centrifugal direction includes piston cylinders 5 arranged in series along the axis of the nozzle 1.
1. It is composed of a rod 52 and a conical actuator 53. The cylinder 51 is arranged outside the base of the nozzle 1, and the rod 52 connected to the cylinder 51 passes through the axis of the nozzle 1 and also through the core of the plug body 13, and gradually moves forward at its tip. It is connected to a conical actuator 53 having an enlarged diameter. The actuator 53 receives the bases of the cutters 4, 4 on its tapered surfaces, and the elasticity of the springs 41, 41 brings them into elastic contact. On the other hand, on the outside of the corrugated pipe 3, a cylindrical cutter guide 6 is provided at a portion corresponding to the cutters 4, 4.
As described later, the cutter guide 6 always receives the cutting edge when it moves in the centrifugal direction and its cutting edge penetrates the wall of the corrugated pipe 3. It is preferably placed close to the outer wall of the small diameter portion of the corrugated pipe 3. In reality, since the corrugated pipe 3 runs at a constant speed in its axial direction, it is impossible to fix the cutter guide 6 at this position, so the second
As shown in the figure, a rotating body 60 has a plurality of guides 6 radially arranged at equal intervals, like a sprocket wheel that meshes with the uneven portions of the corrugated pipe 3.
60 achieves the above function. That is, the rotating bodies 60, 60 are connected to the corrugated pipe 3.
When the cutters 4, 4 move in the centrifugal direction in conjunction with the movement of the cutters 4, one of the guides 6 is set so as to be able to approach the outer wall of the small diameter portion of the corrugated pipe 3 so as to receive it without fail. The rotating body 6
0 and 60 are rotatably fitted onto the coaxial suction tubes 70 and 70, and are rotated under the above-mentioned restrictions by a drive device (not shown). This suction tube 70, 70
functions as a support shaft for the rotating bodies 60, 60, and the inside of the pipe is used as an intake passage, and the cutters 4, 4
Suction ports 71, 71 are opened at positions corresponding to the direction of operation of the cutters 4, 4, and the pieces 32 of the pipe 3 cut out by the operation of the cutters 4, 4 are sucked through the inside of the guide 6, and removed by the suction device 7. It functions as a passageway for Thus,
The through hole 31...is drilled by the actuation of the driving means 5, and as the molded corrugated pipe 3 travels, the cylinder 5 is opened at appropriate intervals.
When the actuator 1 is intermittently expanded and contracted, the actuator 53 moves forward and backward along its axis. When the actuator 53 retreats, that is, when the cylinder 51 retracts, the cutters 4, 4 are pushed in the centrifugal direction against the elasticity of the springs 41, 41 due to the action of the tapered surface of the actuator 53, and the cutting edges of the cutters 4, 4 are pushed in the centrifugal direction against the elasticity of the springs 41, 41. A desired through hole 31 is penetrated through the pipe wall of the small diameter portion of the pipe 3.
... is formed and received by the cutter guide 6. The sections 32 excised at this time pass through the cutter guide 6 and are successively removed by suction by the suction device 7. When the cylinder 51 expands and the actuator 53 is pushed forward, the cutters 4, 4 return to their original positions by the restoring elasticity of the springs 41, 41 until the next drilling point of the corrugated pipe 3 is reached. The waiting state is maintained, and by repeating this operation, the through holes 31 are sequentially drilled as the corrugated pipe 3 travels. The locations and number of through-holes 31 are selected depending on the intended use, and are therefore determined by the interval of the telescopic movement of the cylinder 51, the spacing between the cutter guides 6, and the number of cutters 4, 4. and mutual angles are selected as appropriate. In addition, the spring 5 fitted into the rod 52
21 functions to always urge the rod 52 forward, thereby causing the cutters 4, 4 to quickly retreat after completing the drilling work, so as not to impede the continuous running of the corrugated pipe 3.

In the corrugated pipe manufacturing apparatus having the above configuration, after forming the corrugated pipe 3, the punch-type cutters 4, 4 are operated from the inside to the outside in cooperation with the movement of the corrugated pipe 3, and the cut sections 32 are transferred to the cutter guides 6... Since the pieces 32 are removed by suction by the suction device 7 through the pipe 3, the pieces 32 do not remain in the pipe 3. Therefore, there is no concern that the fragments may remain in the ground and clog waterways as in the past.

In addition, although the example of application to the manufacturing apparatus of a corrugated pipe was described above, it goes without saying that it can also be applied to the manufacturing of ordinary perforated synthetic resin pipes. In this case, it will be obvious from the above description that each of the cutter guides 6 may be one piece and may be of a stationary type. In addition, the driving means 5 is a piston cylinder 5 that expands and contracts along the axial direction of the nozzle 1.
1 was used as the drive source, but it is possible to adopt a mechanism in which a rotating body such as a motor is used as the drive source, and the power is intermittently transmitted to the cutters 4, 4 by a cam. Of course, other systems can be adopted without departing from the scope of the present invention.

As described above, when drilling a through hole in a synthetic resin pipe using the device of the present invention, the direction of operation of the cutter relative to the pipe wall is oriented from the inside to the outside, and the cut sections are successively removed by suction. This completely prevents the sections from remaining in the pipe, which simplifies the post-manufacturing adjustment of such pipes and significantly reduces troubles in various fields of application. Moreover, since the present invention can be achieved with only slight improvements to conventional manufacturing equipment, it is extremely efficient, and if these advantages are combined, the value of the present invention is extremely large.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a main part showing an example of the apparatus of the present invention, and FIG. 2 is an enlarged view of the portion lined in FIG. (Explanation of symbols), 1... Extrusion nozzle, 2... Formwork,
3...Synthetic resin pipe, 30...Thermoplastic synthetic resin,
4... Punch type cutter, 5... Drive means, 6... Cutter guide, 7... Suction device.

Claims (1)

[Claims] 1. In a synthetic resin pipe manufacturing device that continuously extrudes thermoplastic synthetic resin from an extrusion nozzle, in front of the extrusion nozzle, there is a device that acts outward from the inside on the wall of the molded synthetic resin pipe. A punch-type cutter is disposed, and a drive means for intermittently operating the cutter is provided coaxially with the extrusion nozzle, and the cutter is received at a portion corresponding to the cutter on the outside of the synthetic resin pipe. In addition to arranging a cylindrical cutter guide to obtain
The inside of the cutter guide is connected to a suction device outside the system, and the cutter is operated intermittently in cooperation with the continuous extrusion molding of the synthetic resin pipe to sequentially drill through holes in the wall of the pipe. A continuous production device for a perforated synthetic resin pipe, characterized in that the cut section is passed through a cutter guide and removed by suction.