JPS5839601B2 - Plastic pipe fitting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plastic pipe cutting device, which is used to cut a pipe extruded from a plastic pipe extruder and chamfer the cut end.

When connecting plastic pipes, an enlarged-diameter socket may be formed on one end of the pipes to be connected, and the other pipe end, that is, the socket, may be inserted into the socket. for,
A chamfer is provided to facilitate insertion of the socket into the socket.

Particularly when using plastic pipes as electric wire ducts or sewer pipes, make sure that there is no gap left between the tapered surface at the back of the socket and the surfaces at the tip of the socket.
This close contact is necessary to prevent the wires from getting caught or the suspended matter in the sewage from getting caught when the wires are drawn in.

For this reason, the tip of the socket must be chamfered precisely.

By the way, the conventional manufacturing method for plastic pipes having sockets and insertion ports is to extrude the pipe using a plastic pipe extruder, cut it to a certain length, and mold a socket at one end of the cut pipe. This method involves chamfering the other end of the pipe.

In contrast to this method, if the cut end can be chamfered at the same time as the pipe is cut, it is only necessary to form the socket after cutting the pipe, and the chamfering process after cutting the pipe can be omitted, reducing the number of steps by one.

However, in the past, there has been no device that can cut a plastic pipe extruded from an extruder, that is, a running pipe, and at the same time precisely chamfer the cut end.

The plastic pipe cutting device according to the present invention is capable of cutting a running plastic pipe and chamfering the cut end at the same time, and is configured to easily detect a defective chamfer if it occurs. A cylindrical frame through which the pipe is inserted is provided on a cart that is moved as the plastic pipe to be cut runs,
A ring is rotatably attached to the end of the cylindrical frame, and a cutting tool for cutting the pipe and chamfering the cut end is supported on the ring so as to be movable in the radial direction of the ring. A chucking device is provided for holding the plastic pipe in the opposite direction to the traveling direction of the plastic pipe and near the cutting tool, and the chucking device is arranged in a circular frame divided into two. A structure in which several pipe holding members are elastically supported in the radial direction of a circular frame at intervals in the direction, and each folding member is provided with a detection means for detecting the amount of movement of the holding member. It is characterized by the following.

The present invention will be explained below with reference to the drawings.

In FIG. 1, p is a plastic pipe that is moved in the direction of arrow m.

Reference numeral 1 denotes a rail, 2 a cart movably mounted on the rail 1, and an umum gear 3 rotatably supported at the center of the cart.

Reference numeral 4 denotes an electric motor attached to a truck, and a screw 5 is attached to the rotating shaft, and the screw 5 is mounted on the above-mentioned Umm gear 3.

Reference numeral 6 denotes a cylindrical frame fixed on the trolley 2, and is composed of a fixing part 61 and a frame body 62 screwed into the fixing part 61, and a groove 7 is provided in the inner peripheral surface of the frame body 62. ing.

Reference numeral 8 denotes a ring-shaped slider that is slidably housed in the cylindrical frame 6, and a ring-shaped protrusion 81 is provided at the center of the outer surface, and the ring-shaped protrusion 81 is inserted into the groove 7 of the cylindrical frame main body 62. - The groove 7 is divided into two chambers 71, 72, which are brought into sliding contact via a ring.

The inner surface of the tip of this ring-shaped slider 8 is a tapered surface 81.
’.

91 and 92 are pressurized fluid passages provided in the cylindrical frame main body 62, one passage 91 communicating with the chamber 71 and the other passage 92 communicating with the chamber 72.

11 and 111 are springs installed between each end of the ring-shaped slider 8 and each end of the cylindrical frame 6; 12.1
21, 122 and 123 indicate 0-rings, respectively.

Reference numeral 13 denotes a ring fitted onto the outer periphery of the tip of the cylindrical frame 6 via a bearing 14, and a screw groove 15 is provided on the outer periphery, and the screw groove 15 is meshed with the worm gear 3 of the truck 2. There is.

16 is a bite guide attached to the ring 13;
The details are shown in FIG.

Reference numeral 17 denotes a cutting tool holder, which, as shown in FIG. 2, is slidably fitted into the cutting tool guide 16, and the cutting tool 18 is supported by a cutting tool adjusting screw 19.

This cutting tool 18 includes a blade portion 181 for cutting the plastic pipe P and a tapered polished surface 182 for chamfering the cut end of the pipe P, and the position of the pipe P in the radial direction is adjusted by the screw 19 described above. This will be done as appropriate.

Reference numeral 21 denotes a horizontal shaft attached to the tool holder 17, which projects toward the inside of the cylindrical frame 6, and has a tapered roll 22 pivotally supported at its tip.

The tapered surface 23 of the tapered roll 22 is adapted to the tapered surface 81' of the ring-shaped slider 8 so as to be in close contact with the tapered surface 81' of the ring-shaped slider 8.

Reference numeral 23 denotes a spring for returning the cutting tool, which is stretched between the horizontal shaft 21 and the ring 13, and pulls the cutting tool holder 17 in the n direction.

B is the main chucking device for clamping the plastic pipe, as shown in Figures 3A and 3B,
It has a configuration in which pipe holding members 28, 28... are supported by springs 29 at intervals in the circumferential direction within a cylindrical frame 27 split into two parts, and a means for detecting the amount of movement of the pipe holding members 28 is provided. It is provided.

For example, a magnetic pin 31 is attached to the pipe holding member 28, and a coil 32 is provided for detecting the amount of movement of the pin 31 by a change in inductance.

According to this movement amount detection device, when the pipe P is flattened, it is possible to detect the flattening of the pipe P from the difference in the output of each detection coil 32, and also to detect the change in the outer diameter of the pipe P. This can be detected from the output value of the detection coil 32.

When only detecting outside diameter fluctuations, it is sufficient to provide a detection device on only one pipe holding member.

In FIG. 1, B' is an auxiliary chucking device;
In this device B', the above-mentioned detection device may be omitted.

The main chucking device B and the auxiliary chucking device B' are supported on the truck 2.

24 is a limit switch attached to the rear end of the cylindrical frame 6, 25 is a stopper for the limit switch 24, and is supported by a bar 26 on the ring-shaped slider 8.

Next, the operation of the device of the present invention will be explained.

Assuming that the traveling speed of the pipe P is V and the pipe cutting length is L, a pipe cutting signal is transmitted from the control section (not shown) at a time interval of L/V, and this signal causes the main chucking device B, auxiliary chucking device B' is actuated;
The pipe is clamped by these chucking devices B, B' and the electric motor 4 is driven.

When the pipe P is clamped by the chucking devices B and B', the cart 2 is moved together with the pipe P, and the ring 13 is rotated by the drive of the electric motor 4.

The signal also activates a hydraulic or pneumatic device (not shown) to move the ring-shaped slider 8 into the passage 91.
Pressurization of the pressurizing chamber 71 through the ring-shaped slider 8 causes the tapered roll 22 to be pushed downward, and the cutting tool 18 is brought into contact with the pipe P.

The cutting tool 18 is rotated together with the ring 13, and therefore the horizontal shaft 21 is also rotated around the axis of the ring 13, but the tapered roll 22 at the tip of the horizontal shaft rotates smoothly against the tapered surface 81/ of the ring-shaped slider 8. Therefore, the cutting tool 18 is not rotationally restrained by the slider 8,
As the slider 8 moves downward, it is bitten into the pipe P.

As a result, the running pipe P is chamfered at the same time as it is cut.

The setting position of the cutting tool 18 is determined such that the stopper 25 of the ring-shaped slider 8 comes into contact with the limit switch 24 when the cutting and chamfering of the pipe are completed by the cutting tool 18.

Therefore, when the cutting and chamfering of the pipe P are completed, the limit switch 24 is activated, and as a result of the activation of the limit switch 24, the aforementioned hydraulic or pneumatic device (not shown) is activated, and the pressure chamber 72 in the cylindrical frame 6 is activated.
is pressurized through the passage 92, and the ring-shaped slider 8 is retreated in the m direction.

As the ring-shaped slider 8 retreats, the tapered roll 22 is moved in the n direction while being subjected to the tensile force of the spring 23, and the 1M) 18 is ejected from the pipe P.

After the cutting tool 18 escapes, the main chucking device B and the auxiliary chucking device B' are released, and the cart 2 is returned to its initial position before the next cutting signal is sent.

In the above, the rotating machine 4 may be kept rotating all the time.

Of course, when the trolley 2 returns to its initial position, the rotating machine 4 may be stopped and then driven again by the next pipe cutting signal.

When cutting and chamfering the plastic pipe described above, if the pipe becomes flattened or has a variation in outer diameter, the chamfer becomes uneven in the circumferential direction or the chamfer depth changes, leading to chamfering defects.

However, since the main chucking device B detects the flattening of the pipe or the excess or deficiency of the outer diameter of the pipe, pipes with defective chamfering can be easily selected and removed by emitting an alarm at the same time as this detection.

FIG. 4 shows another example of the cutting machine used in the present invention, in which the ring 13 has a cylinder oil chamber 16a.

16b is provided, and the cylinder oil chamber 16a is provided with a cutting tool 1.
The piston rod 21' is inserted into the cylinder oil chamber 16b, and the air cylinder 9 is inserted into the air cylinder 9.
The downward movement of the piston rod 9'' by `` causes the cutting tool 18 to be hydraulically moved in the Z direction.

A moving ring 8 is attached to the tip of the piston of the air cylinder 91, and the piston rod 2P is brought into contact with the ring 8 via a roll 22 attached to the end of the rod.

11' is a compression spring for returning the piston rod 21, and 19 is a rod for adjusting the initial position of the cutting tool.

In FIG. 4, the configuration other than the above is the same as that in FIG. 1.

The plastic pipe cutting device according to the present invention has the above-described configuration and can chamfer the running plastic pipe at the same time as cutting. Can be chamfered.

Therefore, after cutting the pipe, a plastic pipe with a beveled socket can be obtained by simply molding the socket.

Furthermore, the running pipe is located at the center of the cylindrical frame, and the cutting tool is attached to a ring that rotates concentrically with the cylindrical frame, and the cutting tool gradually bites into the pipe, so that the cut end of the pipe is The tapered polished surface of the cutting tool allows for precise and uniform chamfering in the circumferential direction.

Even if a chamfering failure occurs due to flattening of the plastic pipe or an excess or deficiency in the outer diameter, the main chucking device will easily detect the flattening of the pipe, excess or deficiency in the outer diameter, etc.
Therefore, it is very easy to sort out and remove plastic pipes with defective chamfers.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram showing the device of the present invention, Figure 2 is an explanatory diagram showing details of a part of the guide holder in Figure 1, and Figure 3A.
3 is a partially vertical side view of the main chucking device used in the present invention, FIG. 3B is a sectional view taken along line bb in FIG. 3A, and FIG. 4 is an explanatory diagram showing another embodiment of the present invention. . In the figure, 2 is a trolley, 6 is a cylindrical frame, 13 is a ring, 18 is a cutting tool, B is a main chucking device, 27 is a circular frame split into two parts of chucking device B, 28, 28...
is the pipe holding member, 29 is the spring, and 32 is member 2.
8 is a movement amount detection means, and P is a plastic pipe.

Claims (1)

[Claims] 1. A cylindrical frame through which the pipe is inserted is provided on a cart that moves along with the travel of the plastic pipe to be cut, and a ring is rotatably attached to the end of the cylindrical frame, and the pipe is attached to the ring. A cutting tool for cutting the plastic pipe and chamfering the cut end is supported so as to be movable in the radial direction of the ring, and the plastic pipe is placed in a direction opposite to the traveling direction of the plastic pipe and in the vicinity of the cutting tool. A chucking device for holding the pipe is provided, and the chucking device elastically holds the pipe holding members of the bottom at intervals in the circumferential direction within the circular frame divided into two parts in the radial direction of the circular frame. A plastic pipe cutting device characterized in that the plastic pipe is movably supported and each presser member is provided with a detection means for detecting the amount of movement of the presser member.