JPH0433598B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is directed to a plastic pipe suitable for manufacturing a short thin-walled plastic pipe corrugated with a plurality of holes used as a filter medium for water treatment, for example. This invention relates to an automatic pipe punching and cutting device.

(Prior Art) This type of short plastic pipe can be manufactured by punching holes at predetermined intervals in a long corrugated plastic pipe and cutting the pipe into a predetermined length. If a rotary blade is used to perforate such plastics, the perforating device becomes complicated, the equipment costs are high, and the cutting process is troublesome. In addition, press-type punching is inappropriate because it crushes the thin, non-rigid plastic pipe.

For this reason, the present applicant previously proposed a device suitable for drilling such thin-walled long corrugated plastic pipes (see Japanese Patent Application No. 198153/1983 and Japanese Patent Application No. 48775-6/1989). ). On the other hand, it is necessary to cut the long plastic pipe that has been perforated in this way across the perforation, but if the perforation and cutting can be performed continuously with one machine, productivity will improve and it will be convenient. It is.

(Object of the Invention) An object of the present invention is to provide an automatic punching and cutting device for plastic pipes that can reliably punch a long thin-walled plastic pipe and cut the plastic pipe after punching. There is a particular thing.

(Structure of the Invention) The automatic drilling and cutting apparatus for plastic pipes according to the present invention includes a pipe guiding means for guiding and receiving a long plastic pipe to be punched and cut, and a pipe guiding means for intermittently feeding the long plastic pipe to the pipe guiding means. a pipe feeding means for supplying the pipe, and a perforating means for perforating the long plastic pipe at regular intervals;
cutting means for cutting the long plastic pipe perforated by the perforation means on both sides of the perforation position to form a plurality of short perforated plastic pipes, the pipe guide means being arranged in a line with cutting intervals. It consists of a plurality of guide pipes arranged through which the elongated plastic pipes are guided, and the perforation means includes a plurality of guide pipes for piercing the plastic pipes in the guide pipes through the through holes of the guide pipes of the pipe guide means. The cutting means includes a plurality of heated hollow perforating blades and a push-down mechanism that presses down the plurality of heated hollow perforating blades, and the cutting means includes a plurality of cutting blades arranged correspondingly between the plurality of guide pipes of the pipe guide means. The cutting jig is characterized in that it is comprised of a cutting jig having the following characteristics, and a jig displacement mechanism that advances the cutting jig so that it enters between the guide pipes and retracts the cutting jig from between the guide pipes.

In this device, a long plastic pipe to be perforated and cut is intermittently fed into a pipe guiding means by a pipe feeding means, and the pipe guiding means consists of a plurality of guide pipes arranged at each cutting interval. Since this guide pipe has a through hole through which the hollow perforation blade of the perforation means passes, the plurality of guide pipes act as molds and can perform perforation and cutting with high precision.

(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings. FIGS. 1 to 4 show an automatic punching and cutting device 10 for plastic pipes according to the present invention. , a pipe guide means 14 for guiding and receiving the long plastic pipe 12 to be punched and cut; a pipe feeding means 16 for sequentially and intermittently feeding the long plastic pipe 12 to the pipe guiding means 14; Perforation means 18 for perforating the pipe 12 at regular intervals
and a cutting means 20 for cutting the long plastic pipe 12 perforated by the perforation means 18 on both sides of the perforation position to form a plurality of short perforated plastic pipes 12A as shown in FIG. We are prepared.

The pipe guide means 14 is attached to an inverted U-shaped frame 23 on the machine base 21, as shown in FIGS. 1 and 3.
It is made up of a plurality of guide pipes 22 which are arranged in a row with cutting intervals and through which the long plastic pipe 12 is guided. Further, the pipe feeding means 16 includes a pipe feeding machine 2 disposed on the inlet side of the pipe guiding means 14, as shown in FIG.
4 and a perforation detector 26 such as a photoelectric switch arranged on the exit side of the pipe guide means 14. When the perforation cutting operation is completed, the pipe feeder 24 is driven and the perforation detector 26 detects the number of perforations (as shown in the figure). 3 perforations), the pipe feeder 24
Stops driving. In the present invention, the pipe guide 22 is not only pipe-shaped in the strict sense, but is also used in a broader sense to include a gutter-like member having a longitudinally cut out top surface.

The perforation cuts 18 include a plurality of perforations (3) perforating the length of plastic pipe 12 on the pipe guide means 14.
A plurality (three) of blade holding blocks 30 each holding a hollow punching blade 28, and a plurality (three) of heater holding blocks 34 holding a rod-shaped electric heater 32 passing through these hollow punching blades 28.
It is equipped with Each guide pipe 22 of the pipe guide means 14 is provided with a through hole 22a through which the perforating blade 28 and the rod-shaped electric heater 32 pass. Further, the rod-shaped electric heater 32 has the function of heating the hollow punching blade 28 through which the heater 32 passes, and also removing the facets formed by the hollow punching blade 28 so as to extend later.

A push-down mechanism 36 that pushes down the hollow drilling blade 28 and the rod-shaped electric heater 32 is attached to a blade-down air cylinder 38 and the blade holding block 30 provided between the machine base 21 and the blade holding block 30. Blade holding block 30 and heater holding block 3
4 and a heater press-down air cylinder 40 provided between the two. Therefore, when this blade pressing cylinder 38 is driven, the blade holding block 30 is lowered and the punching blade 28 is pressed down, and
The heater press-down air cylinder 40 operates after the perforating blade 28 perforates the long plastic pipe 12 on the pipe guide means 14 and lowers the heater holding block 34 to remove the facet formed by the perforation of the plastic pipe 12. A rod-shaped electric heater 32 penetrates the plastic pipe 12 so that it falls off. In the illustrated embodiment, a drop-off hole 23a for dropping the face of the plastic pipe 12 is provided at the perforation position of the frame 23, and a rotating brush 42 is installed within the frame 23 in alignment with the drop-off hole 23a. This rotating brush 42 is driven by a motor 44 via its sprocket 46 and chain 48.

As can be seen from FIGS. 1 and 2, the blade holding block 30 has sliding tubes 52, 52' at both ends, which are slidably fitted into guide rods 50, 50' attached to the frame 23. The blade holding block 30 is vertically guided.

As shown in FIGS. 1, 2, and 4, the cutting means 20 includes a cutting jig 56 having a plurality of cutting blades 54 arranged correspondingly between the plurality of guide pipes 22 of the pipe guide means 14. The cutting jig 56 is advanced so that the plurality of cutting blades 54 enter between the guide pipes 22, and the plurality of cutting blades 54 are
It consists of a jig displacement mechanism 58 that moves the jig backward so that it comes out of this space. The cutting jig 56 includes a frame 62 that rotatably supports a rotating shaft 60 that rotates the cutting blade 54. A blade rotation motor 64 is mounted on this frame 62, and the motor 64 is rotated by a pulley belt mechanism 66. It is adapted to rotate around a shaft 60. Note that the cutting blades 54 are arranged on the rotating shaft 60 with cutting intervals provided by a spacer 68. As particularly shown in FIG. 4, the frame 62 is pivotally supported on a pivot shaft 70 supported on the machine base 21, and the cutting jig 56 pivots around this pivot shaft 70. It is possible to move between the cutting position shown by solid lines in FIGS. 3 and 4 and the non-cutting position shown in FIG. 5.

The jig displacement mechanism 58 has a bracket 7 on the machine base 21.
The frame 6 of the cutting jig 56 is
It consists of an air cylinder 74 having a piston rod 74a connected to the piston rod 74a. Therefore, as shown in FIG. 4, when the piston rod 74a of the air cylinder 74 is extended, the cutting jig 56 is in the cutting position, and as shown in FIG. 5, when the piston rod 74a of the air cylinder 74 is retracted, the cutting position is set. The jig 56 is in the non-cutting position.

FIG. 6 shows a control means 76 for sequentially controlling the apparatus of the present invention.
6. Start the punching means 18 and the cutting means 20 in sequence. That is, first, the motor 80 of the feeding means 16 is driven, this motor 80 is stopped by a command from the photoelectric switch 26, and then the actuator 82 is activated, which drives the air circuit of the air cylinder 38 for pushing down the blade of the perforating means 18. and heater push-down air cylinder 4
The actuator 84 that drives the air circuit 0 and the motor 44 that drives the rotating brush 42 are sequentially activated. Next, the air actuator 86 that drives the air circuit of the air cylinder 74 of the jig displacement mechanism 58 of the cutting means 20 is activated and the cutting blade 54 is activated.
The rotation motors 64 are sequentially driven.

Next, to describe the operation of the automatic drilling and cutting device of the present invention, when the piston rod of the blade-pressing air cylinder 38 is contracted to push down the blade-holding block 30, the blade-holding block 30 and the heater-holding block 34 are moved relative to each other. The perforating blade 2 descends while maintaining the relationship, and is heated to, for example, 300°C by an electric heater 32.
8 and a rod-shaped electric heater 32 contact the plastic pipe 12. Furthermore, when the blade-pressing air cylinder 38 continues to contract, the heated perforating blade 28
penetrates the plastic pipe 12 so as to cut it. In this state, the blade press-down air cylinder 38 reaches the stroke end and stops (see FIG. 5A), and when the heater press-down air cylinder 40 is driven, the plastic pipe 1
Since the rod-shaped electric heater 32 which is in contact with the face 2 is pushed down, the face 12a is dropped by the electric heater 32 and extracted from the plastic pipe 12 (see FIG. 5B).
When the piston rod of the heater push-down air cylinder 40 is extended, the heater holding block 34 rises to the position shown in FIGS. 3 and 4, and when the piston rod of the blade push-down air cylinder 38 is then extended, the blade holding block 30 rises. Therefore, both blocks 30 and 34 return to their original positions. At this time, since the rod-shaped electric heater 32 rises while its tip contacts the rotating brush 42, the facets 12a are reliably separated from the electric heater 22, and therefore do not rise together with the electric heater 32.

Thereafter, the air cylinder 74 of the jig displacement mechanism 58 of the cutting means 20 is activated and the cutting jig 56 is moved to the third position.
As shown in the drawings and FIG. 4, the plastic pipe 12 is moved to the cutting position, and the motor 64 for rotating the cutting blade is activated to cut the long plastic pipe 12 on both sides of the perforation 12a. In this case, the guide pipe 22 holds the long plastic pipe 12 therein, so that the cutting is carried out reliably. After cutting is completed in this way, the motor 64 stops, and the jig displacement mechanism 5
8 moves the cutting jig 56 in the opposite direction, and the cutting jig 5
6 to the non-cutting position. Finally, the short plastic pipe with perforations manufactured in this way 1
2A (see FIG. 7) is extruded by the feeding means 16 so that three short plastic pipes 12A
is stored in the product storage container 88. After that, the above operation is repeated again and the plastic pipe 12
The holes and cuts are made at intervals. still,
This product storage container 88 is detachably attached to the machine base 22 below the outlet side of the pipe guide means 14, as shown in FIG.

(Effects of the Invention) According to the present invention, as described above, long plastic pipes can be reliably perforated and cut, so a large number of short plastic pipes with perforations can be manufactured with high productivity. A plurality of guide pipes serving as the pipe guide means are arranged in a line across the cutting position and have a through hole through which the hollow perforation blade of the perforation means passes, so that the plurality of guide pipes act as a mold to perform the perforation. There is a practical benefit in that cutting can be performed with high precision. In particular, when drilling a plastic pipe, the entire circumference of the guide pipe, excluding the through hole, is supported, so the drilling work can be carried out reliably, and multiple guide pipes are lined up with cutting intervals. Since the plastic pipe to be processed is installed and removed in the direction of the pipe axis, which is perpendicular to the drilling/cutting direction, the plastic pipe can be continuously fed and discharged. Since it is made of a heated hollow hole, there is no twisting or vibration of the material during drilling, which has the practical advantage of being able to drill with high precision and with less noise.

[Brief explanation of drawings]

1 and 2 are a front view and a top view of an automatic drilling and cutting device for plastic pipes according to the present invention,
3 and 4 are cross-sectional views taken along lines A-A and B-B in FIG. 1, respectively, and FIGS. 5A and 5 are the same cross-sections as in FIG. FIG. 6 is a system diagram of the control means, and FIG. 7 is a perspective view of a short length of perforated plastic pipe produced by the apparatus of the present invention. DESCRIPTION OF SYMBOLS 10... Automatic drilling and cutting device for plastic pipes, 12... Plastic pipe, 12A... Short plastic pipe with holes, 14... Pipe guiding means, 16... Pipe feeding means, 18... Punching means, 20... Cutting means, 22...Guide pipe, 22a...Through hole, 28...Hollow punching blade, 3
2... Rod-shaped electric heater, 36... Push-down mechanism, 54... Cutting blade, 56... Cutting jig, 58...
...Jig displacement mechanism, 64...Blade rotation motor, 74...
...Air cylinder, 76...Control means.

Claims (1)

[Claims] 1 Pipe guiding means for guiding and receiving a long plastic pipe to be perforated and cut; pipe feeding means for intermittently feeding the long plastic pipe to the pipe guiding means; The pipe guide comprises a perforation means for making a hole and a cutting means for cutting a long plastic pipe perforated by the perforation means on both sides of the perforation position to form a plurality of short perforated plastic pipes. The means comprises a plurality of guide pipes arranged in an array with cutting intervals and through which the elongated plastic pipe is guided; The cutting means includes a plurality of heated hollow perforating blades for perforating the plastic pipes in the guide pipe, and a push-down mechanism that presses down the plurality of heated perforating blades, and the cutting means is configured to pierce the plurality of guide pipes in the pipe guiding means. It consists of a cutting jig having a plurality of cutting blades arranged correspondingly between the guide pipes, and a jig displacement mechanism that advances the cutting jig so that it enters between the guide pipes and retreats from between the guide pipes. An automatic drilling and cutting device for plastic pipes, which is characterized by: