JPH0443759B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) 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 drilling 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 has previously proposed an apparatus suitable for drilling such thin-walled corrugated plastic pipes (see Japanese Patent Application No. 1981-153/1982). This device uses an electric heater to heat the hollow drilling blade and press it down to drill the plastic pipe, so the plastic pipe is heated and the pipe is not deformed. Since the blade only penetrates the pipe, the cut pieces remain in the pipe, making subsequent processing cumbersome.

(Objective of the Invention) An object of the present invention is to provide an automatic drilling device for plastic pipes that can reliably drill long thin-walled plastic pipes and does not require any subsequent processing.

(Structure of the Invention) The automatic drilling device for plastic pipes according to the present invention includes a pipe receiver for receiving a plastic pipe to be drilled, and a pipe feeder for sequentially and intermittently feeding long plastic pipes to the pipe receiver. a blade holding block that holds a hollow punching blade for piercing a plastic pipe on the pipe holder; a heater holding block that holds a rod-shaped electric heater that passes through the hollow punching blade; a blade pushing means for pushing down the heater holding block; a heater pushing means for pushing down the heater holding block; and after the piercing blade cuts the plastic pipe on the pipe holder, the rod-shaped electric heater protrudes from the piercing blade and penetrates the plastic pipe. It is characterized by comprising a control means for controlling the blade pushing down means and the heater pushing down means.

In this device, when the blade holding block is pressed down by the blade pressing means, the hollow punching blade heated by the electric heater cuts the plastic pipe. Thereafter, the rod-shaped electric heater is pressed down by the heater pressing means, and when it passes through the perforation blade and protrudes from the perforation blade, the face punched by the hollow perforation blade is pressed down by this electric heater. Pulled out of plastic pipe. The plastic pipe is therefore reliably perforated. When the heater pressing means and the blade pressing means are sequentially raised, the blade holding block and the heater holding block return to their original positions, and after feeding the plastic pipe a predetermined length, the above operation is repeated again to create a gap between the plastic pipes. Drilling is performed.

(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings. Figs. 1 to 3 show an automatic drilling device 10 for plastic pipes according to the present invention. a pipe receiving device 14 for receiving a plastic pipe 12 to be processed; a pipe feeding means 16 for sequentially and intermittently feeding a long plastic pipe 12 to this pipe receiving device 14; pipe 1
a blade holding block 20 that holds a hollow punching blade 18 for drilling holes in the hollow punching blade 18;
2, and a heater holding block 24 for holding the heater. As can be seen from FIG. 3, the pipe receiver 14 is mounted on a machine base 26 via an inverted U-shaped frame 28. The pipe feeding means 16 has a first
As shown in the figure, a pair of upper and lower feed rollers 30, 30' engage with the upstream side of the plastic pipe 12.
and a photoelectric switch 32 which generates a command to stop driving these feed rollers 30, 30'. In the embodiment shown there are three perforating blades 18 and 3.
Since the plastic pipe 12 has three rod-shaped electric heaters and three holes 12b are simultaneously formed at intervals, the plastic pipe 12 is fed by the feeding rollers 30, 30', and the three holes 12b are formed at the same time. 12b passes the photoelectric switch 32, the driving of the feed rollers 30, 30' is stopped.

A blade pressing means 34, such as an air cylinder, is provided between the machine base 26 and the blade holding block 20. Therefore, when the blade pressing means 34 is driven, the blade holding block 20 is lowered to perform drilling. Blade 18 is pushed down.

Also, a heater pressing means 3 such as an air cylinder is provided.
6 is attached to the blade holding block 20 and is provided between this blade holding block 20 and the heater holding block 24, and this heater pressing down means 36
After the perforating blade 18 cuts the plastic pipe 12 on the pipe holder 14, it operates and moves down the heater holding block 24 to cut the plastic pipe 1.
The rod-shaped electric heater 22 is attached to the hollow punching blade 1 so that the cut 12a formed by cutting the rod-shaped electric heater 22 falls off.
8 and penetrates into the plastic pipe 12. In the illustrated embodiment, the plastic pipe 12 is inserted into the pipe receptacle 14 and the frame 28 at the perforation locations.
Drop-off holes 14a, 28a are provided for dropping the facets, and a rotating brush 38 is installed within the frame 28 in alignment with these drop-off holes 14a, 28a. This rotating brush 38 is driven by a motor 40 via its sprocket 42 and chain 44.

As can be seen from FIGS. 1 and 2, the blade holding block 20 has sliding tubes 48, 48' at both ends that are slidably fitted into guide rods 46, 46' attached to the frame 28. The blade holding block 20 is vertically guided.
In addition, in FIGS. 1 and 3, the reference numeral 50 indicates face 1.
This is a container that receives 2a.

FIG. 6 shows a control means 52 that sequentially controls the apparatus of the present invention, and this control means 52 receives a command from a start switch 54 that starts the apparatus, starts the apparatus, and drives the motor 56 of the feeding means 16. , the motor 56 is stopped by a command from the photoelectric switch 32, and then the actuator 58 that drives the air circuit of the blade push-down means 34 is started, and the actuator 60 that drives the air circuit of the heater push-down means 36.
, and the motor 40 that drives the rotating brush 38 are sequentially started.

Next, the operation of the automatic drilling device of the present invention will be described as follows.
When the air cylinder serving as the blade pressing means 34 is contracted and the blade holding block 20 is pressed down, the blade holding block 20 and the heater holding block 24 descend while maintaining their relative relationship with each other, and the electric heater 22 causes the blade holding block 20 to move downward. A drilling blade 18 heated to 300° C. and a rod-shaped electric heater 22 come into contact with the plastic pipe 12. Furthermore, when the air cylinder serving as the blade pressing means 34 continues to contract, the heated perforating blade 18
penetrates the plastic pipe 12 so as to cut it. In this state, when the air cylinder of the blade push-down means 34 reaches the stroke end and stops (see FIG. 4), and the heater push-down means 36 is driven, it will come into contact with the face 12a of the plastic pipe 12. The rod-shaped electric heater 22 is pushed down, and the hollow drilling blade 18
Since it protrudes further and penetrates the plastic pipe 12, the face 12a is dropped by the electric heater 22 and extracted from the plastic pipe 12 (FIG. 5). When the air cylinder that is the heater push-down means 36 is extended, the heater holding block 24 rises to the position shown in FIG. 4, and when the air cylinder that is the blade push-down means 34 is then extended, the blade holding block 20 rises. Both blocks 20, 24
returns to its original position. At this time, the rod-shaped electric heater 22 rises while its tip contacts the rotating brush 38, so that the facets 12a are reliably separated from the electric heater 22, so that they do not rise together with the electric heater 22. In this way, the plastic pipe 12
After the plastic pipe 12 is fed for a predetermined length by the feeding means 16, the above operation is repeated again to make holes in the plastic pipe 12 at intervals.

(Effects of the Invention) According to the present invention, as described above, a long thin-walled plastic pipe can be reliably bored without being deformed, and handling is easy because no subsequent processing is required. There is a practical benefit of being able to process work in a short time.

[Brief explanation of drawings]

1 and 2 are a front view and a side view of an automatic drilling device for plastic pipes according to the present invention, and FIG.
The figure is a sectional view taken along the line A-A in Fig. 1, and Figs. 4 and 5 are sectional views of the automatic drilling device in different working states.
FIG. 6 is a system diagram of the control means. 10...Automatic drilling device for plastic pipes,
12...Plastic pipe, 14...Pipe receiver, 16...Pipe feeding means, 18...Hollow punching blade, 20...Blade holding block, 22...Rod-shaped electric heater, 24...Heater holding block, 34...
...blade pushing down means, 36...heater pushing down means.

Claims (1)

[Claims] 1. A pipe receiver for receiving a plastic pipe to be drilled, a pipe feeding means for intermittently feeding a long plastic pipe to the pipe receiver, and a hollow hole for drilling the plastic pipe above the pipe receiver. A blade holding block that holds a perforating blade, a heater holding block that holds a rod-shaped electric heater that passes through the hollow perforating blade, a blade pressing means that presses down the blade holding block, and a heater that presses down the heater holding block. a push-down means;
The blade pressing means and the heater pressing means are controlled so that after the punching blade cuts the plastic pipe on the pipe receiver, the rod-shaped electric heater protrudes from the punching blade and penetrates the plastic pipe. 1. An automatic drilling device for plastic pipes, characterized in that the device comprises a control means for: