JPS63216697A - Automatic perforator for plastic pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a plastic material 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 is made by drilling holes at predetermined intervals in the long corrugated plastic pipe.

This can be manufactured by cutting it into a predetermined length. If a rotary blade is used to perforate such plastic, the perforation device becomes complicated, equipment costs are high, and the processing of the cut pieces is troublesome. In addition, press-type punching is unsuitable because it crushes the thin-walled, non-rigid plastic pipe.

For this reason, the applicant previously proposed a device suitable for drilling such thin-walled corrugated plastic pipes (
(See Japanese Patent Application No. 198153/1983). 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 drilled while being heated, and the pipe is not deformed during this process. However, with this device, the heated hollow punching blade simply pierces the pipe, so the cut ends remain in the pipe, making subsequent processing cumbersome.

(Object of the Invention) An object of the present invention is to provide an automatic drilling device for plastic pipes that can reliably drill holes in 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 perforating blade that perforates the plastic pipe above the pipe holder; a heater holding block that holds a rod-shaped electric heater that passes through the hollow perforating blade; and a blade holding block. a spring means disposed between the blade holding block and the heater holding block to maintain a maximum distance between the blade holding block and the heater holding block so that the rod-shaped electric heater is normally retracted from the hollow drilling blade; and the blade holding block and the heater holding block; and a block pushing means for pushing down the pipe receiving soldier towards the plastic pipe.

In this device, when the blade holding block and the heater holding block are pushed down by the block pushing means, the two blocks descend while maintaining their relative relationship with each other, and the drilling blade heated by the electric heater and the rod-shaped electric heater Contact with plastic pipes. Therefore, when the block pushing means is further operated, only the blade holding block is lowered while compressing the spring means while maintaining the electric heater above the plastic pipe, and the heated perforating blade is moved to cut the plastic pipe. Penetrate. At this time, the rod-shaped electric heater that is in contact with the facet is lowered by the spring means, so that the facet is pushed down by the electric heater and pulled out from the plastic pipe. When the block pushing means is raised, both blocks return to their original (d
After returning to the position and feeding the plastic pipe a predetermined length, the above operation is repeated again to make holes in the plastic pipe at intervals.

(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 receiver 14 for receiving the plastic pipe 12 to be processed; and a pipe feeding means 16 for sequentially and intermittently feeding the long plastic pipe 12 to the pipe receiver 14.
And the plastic pipe 1 on this pipe holder 14
2, and a heater holding block 24 that holds a rod-shaped electric heater 22 that passes through the hollow drilling blade 18. As can be seen from FIG. 2, the pipe receiver 14 is mounted on a machine base 26 via an inverted U-shaped frame 28. The pipe feeding means 16 is.

As shown in FIG. 1, there is a pair of upper and lower feed rollers 30, 30' that engage the upstream side of the plastic pipe 12, and a photoelectric switch that generates a command to stop the drive of these feed rollers 30, 30'. It consists of 31. As shown in FIG. 3, a blade holding block 20 and a heater holding block 24
and guide plates 32.3 which are slidably engaged with each other.
A plurality of guide pins 36 having a diameter of 4 and fixed to the guide plate 32 pass through elongated holes 38 formed in the guide plate 34 so that the two blocks 20 and 24 can be vertically displaced relative to each other. It has become. As can be seen from FIG. 1, three hollow punching blades 18 are held in one blade holding block 20, and therefore three hollow punching blades 18 are held in the heater holding block 24.
Three rod-shaped electric heaters 22 are held which extend through each of the rods 8. The photoelectric switch 31 is made by punching the plastic pipe 12 at three locations simultaneously, and then pressing the feeding roller 30,
30", and the three holes are photoelectric switches 31
After passing through, the driving of the feeding rollers 30, 30'' is stopped.

The spring means 40 is disposed between the blade retaining block 20 and the heater retaining block 24 and normally maintains a maximum spacing between the blade retaining block 20 and the heater retaining block 24 so that the rod-shaped electric heater 22 is retracted from the hollow drilling blade 18. It is held in In addition, a block pressing means 42 such as an air cylinder is used to hold the blade holding block 20 and the heater holding block 2.
4 toward the plastic pipe 12 on the pipe holder 14.
It is supported between 4 and 4.

In the illustrated embodiment, drop-off holes 14a and 28a for dropping the face of the plastic pipe 12 are provided at the perforation positions of the pipe receiver 14 and the frame 28, and holes 14a and 28a for dropping the face of the plastic pipe 12 are provided in the frame 28 in alignment with these drop-off holes 14a and 28a. An annular brush 44 is installed at. The annular brush 44 has an inner peripheral edge 44a facing downward, and the diameter of the inner peripheral edge is set smaller than the outer diameter of the electric heater 22. Further, as can be seen from FIGS. 1 and 2, the blade holding block 20 has a guide rod 46 attached to the frame 28.
, 46°, and the sliding cylinders 4B, 48° are fitted at both ends, and these sliding cylinders 4B, 48° are stoppers that are screw-adjustably attached to the guide rods 46, 46''. It is designed to collide with the nut 50.

Next, to describe the operation of the automatic drilling device of the present invention, when the air cylinder serving as the block pressing means 42 is contracted to push down the blade holding block 20 and the heater holding block 24,
The two blocks 20 and 24 descend while maintaining their relative relationship to each other, and the perforating blade 18 heated to, for example, 300° C. by the electric heater 22 and the rod-shaped electric heater 22 come into contact with the plastic pipe 12. Furthermore, when the air cylinder that is the block pressing means 42 continues to be compressed, the blade holding block 20 and the heater holding block 24 are lowered while compressing the spring means 40 a little, and the heated perforating blade 18 and electric heater 22 are pressed against the plastic. It pierces through this pipe 12 so as to cut the pipe 12 (see FIG. 5).

At this time, the lower ends of the sliding tubes 4B and 48' are fitted with stopper nuts 50.
Since the blades collide with each other, the blade holding block 20 will not be lowered any further. Therefore, when the air cylinder serving as the block pressing means 42 continues to contract further, the spring means 40 is greatly compressed, and the rod-shaped electric heater 22 that is in contact with the pipe facet 12a is rapidly pressed down. Therefore, the face 12a is dropped by the electric heater 22 and extracted from the plastic pipe 12 (see FIGS. 4 and 6).
(see figure). When the air cylinder serving as the block pushing means 42 is extended and both blocks 20.24 are raised, the nine-car block 20.24 returns to its original position, and after feeding the plastic pipe 12 a predetermined length, the above operation is repeated again. Then, holes are made 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 it is easy to handle because no subsequent processing is required. The work can be done in a short time, and since the blade holding block and the heater holding block can be pushed down with one block pushing means, the structure is simple and the equipment cost is low, which is a practical benefit.

[Brief explanation of the drawing]

Fig. 1 is a front view of an automatic drilling device for plastic pipes according to the present invention, Figs. 2 and 3 are cross-sectional views taken along line A-A and B-B&1 in Fig. 1, and Fig. 4 is an automatic drilling device in a drilling state. The front view of the drilling device, FIGS. 5 and 6, are shown in FIG. 4 C-
FIG. 3 is a cross-sectional view showing different states of the C line. 10-----Automatic drilling equipment for plastic pipeffl
, 12--111 plastic pipe, l4----
- Pipe receiver, 16 - Pipe feeding means, 18
------1 Hollow perforation blade, 20----- Sword holding block, 22----- Rod-shaped electric heater, 24-1---
Heater holding block, 40-- Spring means, 42-
1111 block depressing means. wholeheartedly

Claims (1)

[Claims] 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 blade, a heater holding block that holds a rod-shaped electric heater that passes through the hollow perforating blade, and a heater holding block that is arranged between the blade holding block and the heater holding block, and usually the electric heater spring means for retaining a maximum spacing between the blade holding block and the heater holding block so as to be retracted from the perforating blade; and spring means for pushing the blade holding block and the heater holding block down toward the plastic pipe on the pipe receiver. An automatic drilling device for plastic pipes, characterized in that the device comprises block pressing means.