JP7800617B2 - Coated pipe manufacturing equipment - Google Patents

Description

The present invention relates to a coated pipe manufacturing device.

Coated pipes are used in hot and cold water supply systems for buildings. One example of such coated pipes is shown in Patent Document 1. Coated pipes are formed by passing a pipe through a corrugated pipe. Using such coated pipes in hot and cold water supply systems can reduce damage to the pipes when the system is installed.

Japanese Patent Application Publication No. 11-105151

The object of the present invention is to provide a new coated pipe manufacturing device.

To achieve the above objective, the coated pipe manufacturing apparatus of claim 1 is a coated pipe manufacturing apparatus that forms a coated pipe by inserting the end of a pipe into a corrugated pipe from the end of the corrugated pipe, and is provided with a clamp that can move toward or away from the corrugated pipe, and when the end of the pipe inserted from the end of the corrugated pipe passes a position corresponding to the clamp, the corrugated pipe is clamped by the clamp.

1 is a schematic diagram showing an apparatus for manufacturing coated pipes. 10 is a schematic diagram showing the extension prevention mechanism of the device as viewed from above. FIG. 4 is a cross-sectional view showing a first slider and a second slider. FIG. 10 is a cross-sectional view showing how the first slider moves. FIG. 10 is a cross-sectional view showing how the first slider moves. FIG. 10 is a cross-sectional view showing how the first slider moves. FIG. 10 is a cross-sectional view showing a connection state between the air supply device and the second slider. 4 is a cross-sectional view showing the movement of the coated pipe when it is removed from the manufacturing apparatus. FIG.

An embodiment of an apparatus and method for manufacturing a coated pipe will be described below with reference to FIGS.
As shown in FIG. 1, the coated pipe manufacturing apparatus includes a first station 1, a second station 2, a belt conveyor 3, a guide rail 4, and an elongation prevention mechanism 5.

Station 1 is where workers operate the coated pipe manufacturing equipment. The workers perform the manual tasks required to manufacture coated pipe using the equipment. Station 1 is equipped with an operation panel 6 for operating the coated pipe manufacturing equipment. The operation panel 6 is operated by the worker. Corrugated pipes 7 and pipes 8 required to manufacture coated pipes are transported to Station 1. Station 1 is equipped with a vacuum device 9 for sucking air from inside the corrugated pipes 7.

The second station 2 is located away from the first station 1. The second station 2 is equipped with an air supply device 10 for supplying air into the corrugated pipe 7. The second station 2 is equipped with a drum 12. A wire 11, which serves as a cord, is connected to the drum 12. The drum 12 is capable of winding up the wire 11 and is equipped with an encoder 13 for detecting the amount of wire 11 wound up. The wire 11 passes through the air supply device 10 and extends into the corrugated pipe 7. The second station 2 is also equipped with a proximity sensor 14. The proximity sensor 14 detects when the end of the pipe 8 has reached the second station 2.

The belt conveyor 3 and guide rail 4 are arranged to extend horizontally between the first station 1 and the second station 2. The belt conveyor 3 is equipped with a belt 17 wound around rollers 15 and 16. The belt conveyor 3 switches the rotation of the belt 17 between forward and reverse by switching the rotation direction of rollers 15 and 16. Above the belt conveyor 3, the guide rail 4 extends parallel to the belt conveyor 3. The belt conveyor 3 and guide rail 4 are used to move the corrugated pipe 7 transported to the first station 1 from the first station 1 to the second station 2 during the production of coated pipes.

When the corrugated pipe 7 reaches the second station 2 as a result of the above-described movement, the corrugated pipe 7 extends linearly from the first station 1 to the second station 2. Hereinafter, the position of the corrugated pipe 7 at this time will be referred to as the "passing position." When the corrugated pipe 7 is positioned at the passing position, the first end (the right end in Figure 1) of the corrugated pipe 7 is located at the first station 1, and the second end (the left end in Figure 1) of the corrugated pipe 7 is located at the second station 2.

When the corrugated pipe 7 is transported to the first station 1 during the production of the coated pipe, the second end of the corrugated pipe 7 is located at the first station 1. Hereinafter, the position of the corrugated pipe 7 at this time will be referred to as the "preparation position." When the coated pipe is produced, the corrugated pipe 7 is moved from the preparation position to the pipe insertion position. The pipe 8 transported to the first station 1 is inserted into the corrugated pipe 7 positioned at the pipe insertion position, starting from the first end of the corrugated pipe 7. The coated pipe is then formed by passing the pipe 8 through the corrugated pipe 7.

The coated pipe manufacturing device includes a first slider 19 and a second slider 18. The first slider 19 is disposed within the corrugated pipe 7. The first slider 19 is capable of moving within the corrugated pipe 7 in the longitudinal direction of the corrugated pipe 7. The first slider 19 can be connected to the end of the pipe 8.

The second slider 18 is equipped with an arm 20 for suspending the second slider 18 from the guide rail 4. The arm 20 is provided with wheels 21 that roll along the guide rail 4. The guide rail 4 supports the weight of the second slider 18 via the wheels 21 and the arm 20. The second slider 18 is then able to move along the guide rail 4. The movement of the second slider 18 follows the movement path of the first slider 19 within the corrugated pipe 7.

The second slider 18 can be connected to the second end of the corrugated tube 7. Therefore, the second slider 18 is positioned closer to the second end than the first slider 19. An end of the wire 11 extending from the drum 12 is connected to the first slider 19. This wire 11 passes through the second slider 18. The first slider 19 and the second slider 18 can come into contact with and move away from each other on the movement path of the first slider 19.

More specifically, the first slider 19 and the second slider 18 are configured to abut against each other when they move relative to each other in a direction toward each other. This abutment between the first slider 19 and the second slider prohibits the relative movement between them. On the other hand, the first slider 19 and the second slider 18 are configured to allow relative movement in a direction away from each other. Therefore, when the first slider 19 and the second slider 18 are in abutting contact with each other, they can move relative to each other in a direction away from each other.

When the second slider 18 is moved to the second station 2, the second slider 18 is connected to the air supply device 10. At this time, air can be supplied from the air supply device 10 to the corrugated pipe 7 via the second slider 18. Furthermore, at the first station 1, a vacuum device 9 can be connected to the first end of the corrugated pipe 7. When the air inside the corrugated pipe 7 is sucked out by this vacuum device 9 and air is supplied from the air supply device 10 to the corrugated pipe 7 connected to the second slider 18, the first slider 19 inside the corrugated pipe 7 moves toward the first end due to the air pressure inside the corrugated pipe 7.

The air supply device 10 and vacuum device 9 act as a first drive device that supplies fluid pressure (air pressure in this example) into the corrugated pipe 7, thereby moving the first slider 19 from the second end to the first end within the corrugated pipe 7. The drum 12 acts as a second drive device that moves the first slider 19 from the first end to the second end within the corrugated pipe 7 by winding up the wire 11, thereby pulling the pipe 8 connected to the first slider 19 and passing it through the corrugated pipe 7. Furthermore, with the first slider 19 and the second slider 18 in contact with each other, the driving force of the drum 12 when winding up the wire 11 is transmitted to the second slider 18 via the wire 11 and the first slider 19, thereby pulling the corrugated pipe 7 toward the pipe passing position.

Between the first station 1 and the second station 2 in the coated pipe manufacturing equipment, multiple stretch prevention mechanisms 5 are installed at predetermined intervals along the belt conveyor 3 and guide rail 4.

Figure 2 shows the stretch prevention mechanism 5 as seen from above in Figure 1. The stretch prevention mechanism 5 comprises a base member 22 and a clamp 23. The base member 22 can be moved in the direction in which the belt conveyor 3 extends by an actuator such as an air cylinder. The clamp 23 is supported by the base member 22 and can move integrally with the base member 22. The clamps 23 are located on both sides of the width of the belt conveyor 3 (the vertical direction in Figure 2).

The clamp 23 can be moved toward or away from the corrugated pipe 7 on the belt 17. By bringing the clamp 23 toward the corrugated pipe 7, the corrugated pipe 7 is clamped by the clamp 23. In this state, by moving the base member 22 in the direction in which the belt conveyor 3 extends, the corrugated pipe 7 can be pulled in the direction in which the belt conveyor 3 extends. In addition, by moving the clamp 23 away from the corrugated pipe 7, the corrugated pipe 7 that was clamped by the clamp 23 is released.

Next, the second slider 18 and the first slider 19 will be described in detail.
3, the second slider 18 has a mounting hole 24 extending horizontally and a small-diameter portion 25 for reducing the inner diameter of the mounting hole 24. An end of the corrugated pipe 7 is inserted into one end of the mounting hole 24. A second end of the corrugated pipe 7 can be fixed inside the mounting hole 24. The end of the mounting hole 24 opposite the position where the corrugated pipe 7 is fixed is an air supply port 26 that can be connected to the air supply device 10.

A first slider 19 is disposed inside the corrugated pipe 7 fixed to the second slider 18. The first slider 19 in Figure 3 is located at the second end of the corrugated pipe 7 and is adjacent to the small diameter portion 25. A wire 11 is connected to the first slider 19. The wire 11 passes through the inside of the air supply port 26 and the small diameter portion 25. A threaded portion 19a having a male thread is provided on the surface of the first slider 19 opposite the surface to which the wire 11 is connected.

Relative movement of the first slider 19 relative to the second slider 18 to the left in FIG. 3 is prohibited by the first slider 19 abutting against the small diameter portion 25. On the other hand, relative movement of the first slider 19 relative to the second slider 18 to the right in FIG. 3 is permitted by the first slider 19 moving away from the small diameter portion 25. Such movement of the first slider 19 occurs as it passes through the interior of the corrugated pipe 7.

Figures 4 to 6 show how the first slider 19 moves. As shown in Figure 4, when the air supply port 26 of the second slider 18 is connected to the air supply device 10 of the second station 2, the first slider 19 moves as follows: That is, the first slider 19 moves in a direction (to the right in Figure 4) that unwinds the wire 11 from the drum 12 (Figure 1) due to the supply of air from the air supply device 10 and the suction of air by the vacuum device 9 (Figure 5).

The air pressure inside the corrugated tube 7 causes the first slider 19 to move as described above, and the first slider 19 reaches the first end of the corrugated tube 7 located at the first station 1, as shown in Figure 5. The vacuum device 9 can be removed from the first end of the corrugated tube 7. With the vacuum device 9 removed from the first end of the corrugated tube 7 in this manner, the first slider 19 can be removed from the first end of the corrugated tube 7.

The first slider 19 can be connected to the end of the pipe 8 as shown in Figure 6. Specifically, the first slider 19 is connected to the end of the pipe 8 by fixing a connecting jig 27 to the end of the pipe 8 and screwing the threaded portion 19a of the first slider 19 into the connecting jig 27. In this state, by winding the wire 11 onto the drum 12 (Figure 1), the first slider 19, together with the connecting jig 27 and pipe 8, is moved to the left in Figure 6.

Next, a method for manufacturing a coated pipe will be described.
In this manufacturing method, the coated pipe is formed by sequentially performing the steps using the coated pipe manufacturing apparatus described above, namely, steps 1, 2, 3, 4, 5, and 6. Steps 1 to 6 of the manufacturing method will be described in detail below.

[First step]
In this process, the corrugated pipe 7 and pipe 8 required for manufacturing the coated pipe are transported to the first station 1 (FIG. 1). At this time, the corrugated pipe 7 is in the preparation position at the first station 1 before being moved to the pipe insertion position. As shown in FIG. 3, a worker at the first station 1 connects the second slider 18 to the second end of the corrugated pipe 7. More specifically, the first slider 19 is inserted into the corrugated pipe 7 from the second end. Furthermore, the second end is fixed to the mounting hole 24 of the second slider 18. In other words, the second slider 18 is connected to the second end of the corrugated pipe 7 in the preparation position.

[Second step]
In this process, an operator operates the operation panel 6 shown in Figure 1 to drive the drum 12 and the belt conveyor 3. As a result, the drum 12 winds up the wire 11, and the belt 17 of the belt conveyor 3 rotates in the forward direction (counterclockwise direction in Figure 1). As the wire 11 is wound up by the drum 12, the driving force of the drum 12 is transmitted to the second slider 18 via the wire 11 and the first slider 19. As a result, the corrugated pipe 7 connected to the second slider 18 is pulled from the preparation position toward the pipe passing position. In this way, the corrugated pipe 7 moves integrally with the second slider 18 and the first slider 19 until it reaches the pipe passing position.

The movement of the corrugated tube 7 to the passage position is assisted by the rotation of the belt 17 in the forward direction. The rotation speed of the belt 17 at this time can be set slightly faster than the movement speed of the second slider 18 and the first slider 19. However, it is not necessary to set the rotation speed of the belt 17 in this manner; for example, the rotation speed of the belt 17 can be set equal to the movement speed of the second slider 18 and the first slider 19. By rotating the belt 17 in the forward direction as described above, friction between the corrugated tube 7 and the belt 17 is reduced, thereby preventing the corrugated tube 7 from being pulled in the opposite direction to its movement due to this friction.

The positions of the second slider 18 and the first slider 19 while the corrugated tube 7 is moving change depending on the amount of wire 11 wound around the drum 12. Therefore, the positions of the second slider 18 and the first slider 19 can be determined based on the amount of wire 11 wound detected by the encoder 13. Then, as shown in FIG. 4, when the second slider 18 and the first slider 19 reach the second station 2, the air supply port 26 of the second slider 18 connects to the air supply device 10 of the second station 2. The second slider 18 and the first slider 19 are stopped at the positions where the air supply port 26 was connected to the air supply device 10. In other words, the drive of the drum 12 and the drive of the belt conveyor 3 are stopped.

[Third step]
As described above, when the second slider 18 stops while connected to the air supply device 10, i.e., when the corrugated pipe 7 moves to the pipe opening position, the corrugated pipe 7 extends from the first station 1 to the second station 2.

In this process, a worker at first station 1 (Figure 1) connects a vacuum device 9 to the first end of the corrugated pipe 7 and operates the operation panel 6 to activate the vacuum device 9 and air supply device 10. This causes the vacuum device 9 to suck out air from inside the corrugated pipe 7, and air from the air supply device 10 is supplied into the corrugated pipe 7 connected to the second slider 18, as shown in Figure 4. As a result, the air pressure inside the corrugated pipe 7 causes the first slider 19 to move from the second end to the first end of the corrugated pipe 7. In other words, the first slider 19 moves in a direction that unwinds the wire 11 from the drum 12 (to the right in Figure 4). At this time, the first slider 19 moves relative to the second slider 18, moving away from it.

As shown in Figure 5, when the first slider 19 reaches the first end of the corrugated pipe 7 located at the first station 1, the worker operates the operation panel 6 (Figure 1) to stop the vacuum device 9 and the air supply device 10. The worker then removes the vacuum device 9 from the first end of the corrugated pipe 7, exposing the first slider 19.

[Fourth step]
In this step, the worker connects the first slider 19 to the end of the pipe 8 at the first end of the corrugated pipe 7, as shown in Figure 6. More specifically, the worker fixes a connecting jig 27 to the end of the pipe 8, and then screws the threaded portion 19a of the first slider 19 into the connecting jig 27, thereby connecting the first slider 19 to the end of the pipe 8.

[Fifth step]
In this process, the operator operates the operation panel 6 (FIG. 1) to drive the drum 12. This causes the wire 11 to be wound onto the drum 12. As a result, the first slider 19 moves along the center line of the corrugated pipe 7 toward the second end (second slider 18) of the corrugated pipe 7, as shown in FIG. 6. As the first slider 19 moves in this manner, it pulls the pipe 8 and passes it through the corrugated pipe 7. The position of the first slider 19 at this time can be determined based on the amount of wire 11 wound, which is detected by the encoder 13.

When the first slider 19 passes through the corrugated tube 7, the corrugated tube 7 is pulled in the direction of movement of the first slider 19 due to friction between the two. As a result, the position of the corrugated tube 7 shifts toward the second station 2 (to the left in Figure 1). To return the corrugated tube 7 to its original position, the stretch prevention mechanism 5 shown in Figure 2 is activated.

More specifically, when the first slider 19 inside the corrugated tube 7 passes a position corresponding to the clamp 23 (solid line) of the stretch prevention mechanism 5, the clamp 23 is moved closer to the corrugated tube 7 as shown by the two-dot chain line, thereby clamping the corrugated tube 7. Furthermore, by moving the base member 22 in this state in the direction toward the first station 1 (to the right in Figure 2), the corrugated tube 7, which has shifted position as the first slider 19 has passed, is returned to its original position.

As shown in Figure 7, when the first slider 19 moves until it contacts the small diameter portion 25 of the second slider 18 located at the second station 2, the proximity sensor 14 (Figure 1) at the second station 2 detects the connecting jig 27 fixed to the end of the pipe 8. Based on this detection, the drive of the drum 12 is stopped. In this way, the pipe 8 is passed through the corrugated pipe 7, and a coated pipe is formed.

[6th step]
In this process, an operator at first station 1 operates operation panel 6 (FIG. 1) to drive a conveying device (not shown) for removing the coated pipe from the manufacturing equipment, and also to drive belt conveyor 3. At this time, belt 17 rotates in the reverse direction (clockwise in FIG. 1). Driving the conveying device moves the coated pipe from the pipe insertion position toward the preparation position, as shown in FIG. 8. The movement of the coated pipe at this time is assisted by the rotation of belt 17 in the reverse direction. This reduces friction between the corrugated pipe 7 and belt 17, preventing the corrugated pipe 7 from being pulled in the direction opposite to its movement due to this friction.

The coated pipe is moved from the passage position to the preparation position while the first slider 19 remains connected to the pipe 8 and the second slider 18 remains connected to the second end of the corrugated pipe 7. As a result, the wire 11 is unwound from the drum 12 and the second slider 18 moves to the first station 1. The next corrugated pipe 7 is transported to the preparation position of the first station 1. Therefore, by moving the second slider 18 to the first station 1 as described above, the second slider 18 is moved in advance so that it is positioned near the second end of the next corrugated pipe 7 that will be transported to the preparation position.

As described above, when the coated pipe moves from the pipe passage position to the preparation position, the clamp 23 of the stretch prevention mechanism 5 shown in Figure 2 is moved away from the corrugated pipe 7, releasing the corrugated pipe 7 that had been clamped by the clamp 23. Furthermore, the base member 22 of the stretch prevention mechanism 5 moves from the position indicated by the two-dot chain line in Figure 2 to the position indicated by the solid line. Then, when the second slider 18 and the first slider 19 reach the first station 1 (Figure 1), the conveying device and drum 12 are stopped.

Then, the worker at first station 1 removes the second slider 18 from the second end of the corrugated pipe 7 and the first slider 19 from the end of the pipe 8. This allows the formed coated pipe to be removed from the manufacturing equipment. Then, by repeating the above-described first, second, third, fourth, fifth, and sixth steps, coated pipes are continuously manufactured.

Next, the effects of the coated pipe manufacturing apparatus and manufacturing method according to this embodiment will be described.
(1) When a pipe is passed through the corrugated pipe 7, the first slider 19 connected to the end of the pipe 8 moves along the center line of the corrugated pipe 7 as the wire 11 is wound around the drum 12. Accordingly, the end of the pipe 8 also moves along the center line of the corrugated pipe 7. This prevents the tip of the pipe 8 from coming into contact with the inner wall of the corrugated pipe 7. Furthermore, this prevents the corrugated pipe 7 from meandering due to such contact, thereby preventing the pipe 8 from becoming clogged inside the corrugated pipe 7 due to the meandering. Therefore, when passing the pipe 8 through the corrugated pipe 7, it is not necessary to take the time to clear the clog, which can prevent a decrease in the manufacturing efficiency of coated pipes due to this time.

(2) The worker manufacturing the coated pipe can manufacture the coated pipe simply by operating the operation panel 6 of the first station 1 to operate the manufacturing equipment while performing the manual work required to manufacture the coated pipe at the first station 1. This allows the number of workers required to manufacture the coated pipe to be kept to a minimum.

(3) When the first slider 19 passes through the corrugated tube 7, friction between the two causes the corrugated tube 7 to be pulled in the direction of movement of the first slider 19, causing the position of the corrugated tube 7 to shift toward the second station 2. This positional shift of the corrugated tube 7 can be eliminated by the stretch prevention mechanism 5. In other words, the corrugated tube 7, which has shifted in position as the first slider 19 passes, can be returned to its original position by the operation of the stretch prevention mechanism 5.

The above embodiment can be modified as follows, for example: The above embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.
Of the air supply device 10 and the vacuum device 9 as the first driving device, the vacuum device 9 may be omitted.

Although air pressure is used as an example of the fluid pressure for moving the first slider 19, other fluid pressures may be used.
Although the air supply device 10 and the vacuum device 9 that move the first slider 19 by air pressure have been exemplified as the first driving device, a first driving device that moves the first slider 19 by magnetic force or the like may be used instead.

Although the wire 11 is used as the cord-like body, other materials may be used.
The corrugated pipe 7 delivered from the corrugated pipe manufacturing apparatus may be moved directly to the pipe insertion position without using a conveying device, etc. In this case, it is conceivable to omit the second slider 18 from the first slider 19 and the second slider 18, and use only the first slider 19 as the slider.

In this configuration, the slider (first slider 19) is inserted from the second end of the corrugated pipe 7, which is positioned in the pipe-passing position as described above. The slider is moved from the second end to the first end of the corrugated pipe 7 by air pressure and connected to the end of the pipe 8, which is in the standby position. The wire 11 is then wound around the drum 12, moving the slider from the first end to the second end within the corrugated pipe 7, thereby pulling the pipe 8 connected to the slider and passing it through the corrugated pipe 7.

By passing the pipe 8 through the corrugated pipe 7 in this way, a coated pipe is formed. After formation, the coated pipe is transported outside the manufacturing equipment with the slider removed from the pipe 8. By repeating the above procedure, coated pipes are manufactured continuously.

Next, the technical concept that can be understood from the above embodiment will be described.
1. A coated pipe manufacturing apparatus for forming a coated pipe by inserting an end of a pipe into a straight corrugated pipe placed at a pipe insertion position from a first end of the corrugated pipe,
a cord-like body inserted into the corrugated pipe from a second end of the corrugated pipe;
a slider that is disposed within the corrugated pipe, is coupled to the cord-like body, and can be connected to the end of the pipe, and is movable within the corrugated pipe in the longitudinal direction of the corrugated pipe;
a first drive device that supplies fluid pressure into the corrugated tube to move the slider from the second end to the first end within the corrugated tube;
a second driving device that moves the slider from the first end to the second end within the corrugated pipe by winding up the cord-like body, thereby pulling the pipe connected to the slider and passing it through the corrugated pipe; and
A coated pipe manufacturing apparatus comprising:

With this configuration, when a pipe is passed through the corrugated pipe, the slider connected to the end of the pipe moves along the center line of the corrugated pipe as the second drive device winds up the cord-like body. Accordingly, the end of the pipe also moves along the center line of the corrugated pipe. This prevents the tip of the pipe from coming into contact with the inner wall of the corrugated pipe. Furthermore, this prevents the corrugated pipe from meandering due to such contact, thereby preventing the pipe from becoming clogged inside the corrugated pipe due to such meandering. Therefore, when passing the pipe through the corrugated pipe, there is no need to spend time clearing the clog, which reduces the reduction in manufacturing efficiency of coated pipes that would result from this effort.

(1) A coated pipe manufacturing apparatus for forming a coated pipe by inserting an end of a pipe into a straight corrugated pipe arranged at a pipe passing position from a first end of the corrugated pipe,
a cord-like body inserted into the corrugated pipe from a second end of the corrugated pipe;
a first slider that is disposed within the corrugated pipe, that is coupled to the cord-like body, that can be connected to the end of the pipe, and that can move within the corrugated pipe in the longitudinal direction of the corrugated pipe;
a first driving device that supplies fluid pressure into the corrugated tube to move the first slider from the second end to the first end within the corrugated tube;
a second driving device that moves the first slider from the first end to the second end within the corrugated pipe by winding up the cord-like body, thereby pulling the pipe connected to the first slider and passing it through the corrugated pipe; and
a second slider that is disposed closer to the second end of the corrugated pipe than the first slider, is connectable to the second end, and is movable along a movement path of the first slider;
Equipped with
the first slider and the second slider are capable of coming into contact with and moving away from each other on a movement path of the first slider,
When the first slider and the second slider are in contact with each other, the driving force of the second driving device is transmitted to the second slider via the cord-like body and the first slider, thereby pulling the corrugated pipe connected to the second slider and moving it to the pipe passage position.

(2) A method for manufacturing a coated pipe using the manufacturing apparatus described in the technical concept (1),
a first step of connecting the second slider to the second end of the corrugated pipe in a preparation position before moving to the pipe passing position;
a second step of pulling and moving the corrugated pipe from the preparation position to the pipe passing position by winding up the cord-like body using the second driving device after the first step;
a third step of moving the first slider away from the second slider by the first driving device to move only the first slider toward the first end of the corrugated tube in a state in which the corrugated tube has been placed at the tube-passing position by the second step, and of unwinding the cord-like body from the second driving device;
a fourth step of connecting the end of the pipe to the first slider that has been moved to the first end of the corrugated pipe in the third step;
a fifth step of moving the first slider connected to the end of the pipe in the fourth step to the second end of the corrugated pipe by winding up the cord-like body with the second driving device, thereby pulling the pipe and passing it through the corrugated pipe to form a coated pipe; and
a sixth step of moving the coated pipe formed in the fifth step from the pipe passage position toward the preparation position while the first slider is connected to the pipe and the second slider is connected to the corrugated pipe, thereby moving the second slider in advance to be positioned near the second end of the next corrugated pipe that will arrive at the preparation position, and unwinding the cord from the second driving device;
A method for manufacturing a coated pipe comprising:

(3) A coated pipe manufacturing apparatus for forming a coated pipe by inserting an end of a pipe into a corrugated pipe from an end of the corrugated pipe,
an anti-extension mechanism is provided, the anti-extension mechanism including clamps located on both sides of the corrugated tube in the width direction and capable of moving toward and away from the corrugated tube, and an actuator capable of moving the clamps in the axial direction of the corrugated tube;
The stretch prevention mechanism clamps the corrugated pipe with the clamp and, in this state, moves the clamp with the actuator in the direction opposite to the insertion direction of the pipe, thereby actively pulling the corrugated pipe in the direction opposite to the insertion direction of the pipe, thereby returning the axial stretch of the corrugated pipe caused by the insertion of the pipe to its original position.

REFERENCE SIGNS LIST 1...first station, 2...second station, 3...belt conveyor, 4...guide rail, 5...stretch prevention mechanism, 6...operation panel, 7...corrugated pipe, 8...pipe, 9...vacuum device, 10...air supply device, 11...wire, 12...drum, 13...encoder, 14...
Proximity sensor, 15... roller, 16... roller, 17... belt, 18... second slider, 19...
First slider, 19a... screw portion, 20... arm, 21... wheel, 22... base member, 23...
Clamp, 24...mounting hole, 25...small diameter portion, 26...air supply port, 27...connecting jig.

Claims (1)

A coated pipe manufacturing apparatus for forming a coated pipe by inserting an end of a pipe into a corrugated pipe from an end of the corrugated pipe,
a clamp that can move toward and away from the corrugated pipe;
A coated pipe manufacturing device that clamps the corrugated pipe by bringing the clamp, which is spaced apart from the corrugated pipe, closer to the corrugated pipe when the end of the pipe inserted from the end of the corrugated pipe passes a position corresponding to the clamp.