Coated pipe manufacturing equipment

Abstract

To provide a new coated pipe manufacturing device. [Solution] A coated pipe manufacturing device that forms a coated pipe by pulling and moving a corrugated pipe (7) to a pipe passage position and inserting the end of a pipe (8) into the straight corrugated pipe (7) placed at the pipe passage position, and a belt conveyor (3) is provided to assist the movement of the coated pipe to the pipe passage position.

Description

[Technical field]

[0001] The present invention relates to an apparatus for manufacturing coated pipes. [Background technology]

[0002] Coated pipes are used in hot water supply and hot water supply systems for buildings. For example, the coated pipe shown in Patent Document 1 is known as such a coated pipe. The coated pipe is formed by passing a pipe through a corrugated pipe. By using such a coated pipe in the hot water supply and hot water supply system, damage to the pipe during construction of the hot water supply and hot water supply system can be suppressed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-105151 Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a novel coated pipe manufacturing apparatus. [Means for solving the problem]

[0005] In order to achieve the above object, the coated pipe manufacturing apparatus of claim 1 is a coated pipe manufacturing apparatus that forms a coated pipe by pulling and moving a corrugated pipe to a pipe passing position and inserting an end of a pipe into the straight corrugated pipe placed at the pipe passing position from an end of the corrugated pipe, and is provided with a belt conveyor that assists in moving the corrugated pipe to the pipe passing position.

[0006] In order to achieve the above object, the coated pipe manufacturing apparatus of claim 2 is a coated pipe manufacturing apparatus that forms a coated pipe by inserting an end of a pipe into an end of a straight corrugated pipe placed at a pipe passage position, and pulls the coated pipe to move it from the pipe passage position, and is provided with a belt conveyor that assists in moving the coated pipe from the pipe passage position. [Brief description of the drawings]

[0007] [Figure 1] 1 is a schematic diagram showing an apparatus for manufacturing coated pipes. [Diagram 2] 1 is a schematic diagram showing the anti-stretch mechanism of the device as viewed from above. [Diagram 3] FIG. 4 is a cross-sectional view showing a first slider and a second slider. [Figure 4] FIG. 4 is a cross-sectional view showing how the first slider moves. [Diagram 5] FIG. 4 is a cross-sectional view showing how the first slider moves. [Figure 6] FIG. 4 is a cross-sectional view showing how the first slider moves. [Figure 7] FIG. 4 is a cross-sectional view showing a connection state between the air supply device and the second slider. [Figure 8] 4 is a cross-sectional view showing the movement of the coated pipe when it is removed from the manufacturing apparatus. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of an apparatus and method for producing a coated pipe will be described 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.

[0009] First station 1 is where workers operate the coated pipe manufacturing equipment. The workers perform the manual tasks required to manufacture coated pipes using the equipment. First station 1 is provided 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 first station 1. First station 1 is provided with a vacuum device 9 for sucking air from inside corrugated pipe 7.

[0010] The second station 2 is located away from the first station 1. The second station 2 is provided with an air supply device 10 for supplying air into the corrugated pipe 7. The second station 2 is provided with a drum 12. A wire 11 serving as a cord-like body is connected to the drum 12. The drum 12 is capable of winding up the wire 11, and is provided with an encoder 13 for detecting the amount of the wire 11 that has been 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 provided with a proximity sensor 14. The proximity sensor 14 is for detecting that the end of the pipe 8 has reached the second station 2.

[0011] The belt conveyor 3 and the guide rail 4 are disposed so as to extend horizontally between the first station 1 and the second station 2. The belt conveyor 3 is provided 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 rotation by switching the rotation direction of the rollers 15 and 16. Above the belt conveyor 3, the guide rail 4 extends so as to be parallel to the belt conveyor 3. The belt conveyor 3 and the 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 a coated pipe.

[0012] When the corrugated pipe 7 reaches the second station 2 as a result of the above-mentioned movement of the corrugated pipe 7, 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 disposed at the passing position, a first end (the right end in FIG. 1) of the corrugated pipe 7 is located at the first station 1, and a second end (the left end in FIG. 1) of the corrugated pipe 7 is located at the second station 2.

[0013] When the corrugated pipe 7 is transported to the first station 1 during the manufacture 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 is referred to as the "preparation position". During the manufacture of the coated pipe, the corrugated pipe 7 is moved from the preparation position to a pipe passing position. The pipe 8 transported to the first station 1 is inserted into the corrugated pipe 7 arranged at the pipe passing position, from the first end of the corrugated pipe 7. Then, the pipe 8 is passed through the corrugated pipe 7 to form the coated pipe.

[0014] The coated pipe manufacturing device includes a first slider 19 and a second slider 18. The first slider 19 is disposed inside the corrugated pipe 7. The first slider 19 is capable of moving inside the corrugated pipe 7 in the longitudinal direction of the corrugated pipe 7. The first slider 19 is capable of being connected to an end of a pipe 8.

[0015] The second slider 18 includes an arm 20 for suspending the second slider 18 from the guide rail 4. The arm 20 includes wheels 21 that roll along the guide rail 4. The guide rail 4 receives the weight of the second slider 18 via the wheels 21 and the arm 20. The second slider 18 can move along the guide rail 4. The movement of the second slider 18 follows the movement path of the first slider 19 inside the corrugated pipe 7.

[0016] The second slider 18 can be connected to the second end of the corrugated tube 7. Therefore, the second slider 18 is disposed 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. The wire 11 passes through the second slider 18. The first slider 19 and the second slider 18 can come into contact with each other and move away from each other on the moving path of the first slider 19.

[0017] In detail, the first slider 19 and the second slider are configured to come into contact with each other when they move relative to each other in a direction toward each other. This contact between the first slider 19 and the second slider prohibits the above-mentioned relative movement between them. On the other hand, the first slider 19 and the second slider are configured to allow relative movement in a direction away from each other. Therefore, when the first slider 19 and the second slider are in contact with each other, they can move relative to each other in a direction away from each other.

[0018] 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, it becomes possible to supply air from the air supply device 10 into the corrugated pipe 7 via the second slider 18. Also, at the first station 1, it is possible to connect a vacuum device 9 to a first end of the corrugated pipe 7. When the air in the corrugated pipe 7 is sucked out by this vacuum device 9 and air is supplied from the air supply device 10 into the corrugated pipe 7 connected to the second slider 18, the first slider 19 in the corrugated pipe 7 moves toward the first end by the air pressure in the corrugated pipe 7.

[0019] The air supply device 10 and the vacuum device 9 serve as a first drive device that moves the first slider 19 from the second end to the first end in the corrugated pipe 7 by supplying fluid pressure (air pressure in this example) into the corrugated pipe 7. The drum 12 serves as a second drive device that moves the first slider 19 from the first end to the second end in 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. In addition, the corrugated pipe 7 connected to the second slider 18 is pulled toward the pipe passing position by the driving force of the drum 12 when winding up the wire 11 being transmitted to the second slider 18 via the wire 11 and the first slider 19 with the first slider 19 and the second slider 18 in contact with each other.

[0020] Between the first station 1 and the second station 2 in the coated pipe manufacturing apparatus, a plurality of the stretch prevention mechanisms 5 are provided at predetermined intervals along the belt conveyor 3 and the guide rail 4.

[0021] Fig. 2 shows the stretch prevention mechanism 5 as seen from above in Fig. 1. The stretch prevention mechanism 5 includes a base member 22 and a clamp 23. The base member 22 is capable of moving 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 is capable of moving integrally with the base member 22. The clamps 23 are located on both sides of the belt conveyor 3 in the width direction (the vertical direction in Fig. 2).

[0022] 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 extension direction of the belt conveyor 3, the corrugated pipe 7 can be pulled in the extension direction of the belt conveyor 3. 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.

[0023] 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 also has a small diameter portion 25 for reducing the inner diameter of the mounting hole 24. An end of the corrugated tube 7 is inserted from one end of the mounting hole 24. A second end of the corrugated tube 7 can be fixed inside the mounting hole 24. The end of the mounting hole 24 opposite the fixed position of the corrugated tube 7 forms an air supply port 26 connectable to the air supply device 10.

[0024] A first slider 19 is disposed inside the corrugated pipe 7 fixed to the second slider 18. The first slider 19 in FIG. 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 also passes through the inside of the small diameter portion 25. A threaded portion 19a having a male thread is provided on the surface of the first slider 19 opposite to the surface to which the wire 11 is connected.

[0025] 3 relative to the second slider 18 is prohibited by the abutment of the first slider 19 against the small diameter portion 25. On the other hand, the relative movement of the first slider 19 against the second slider 18 to the right in FIG. 3 is permitted by the separation of the first slider 19 from the small diameter portion 25. Such movement of the first slider 19 is achieved by passing through the inside of the corrugated pipe 7.

[0026] 4 to 6 show how the first slider 19 moves. As shown in Fig. 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 Fig. 4) that reels out the wire 11 from the drum 12 (Fig. 1) by the supply of air from the air supply device 10 and the suction of air by the vacuum device 9 (Fig. 5).

[0027] The above-mentioned movement of the first slider 19 by the air pressure inside the corrugated tube 7 causes the first slider 19 to reach the first end of the corrugated tube 7 located at the first station 1 as shown in FIG. 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, it becomes possible to take out the first slider 19 from the first end of the corrugated tube 7.

[0028] The first slider 19 can be connected to the end of the pipe 8 as shown in Fig. 6. More specifically, a connecting jig 27 is fixed to the end of the pipe 8, and the threaded portion 19a of the first slider 19 is screwed to the connecting jig 27, thereby connecting the first slider 19 to the end of the pipe 8. In this state, the wire 11 is wound up on the drum 12 (Fig. 1), whereby the first slider 19, together with the connecting jig 27 and the pipe 8, is moved to the left in Fig. 6.

[0029] Next, a method for producing the 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, step 1, step 2, step 3, step 4, step 5, and step 6. Hereinafter, steps 1 to 6 of the manufacturing method will be described in detail individually.

[0030] [1st step] In this process, the corrugated pipe 7 and the 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 placed in the preparation position at the first station 1 before being moved to the pipe passing position. The worker at the first station 1 connects the second slider 18 to the second end of the corrugated pipe 7 as shown in Fig. 3. 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 which is in the preparation position.

[0031] [Second process] In this process, an operator operates the operation panel 6 shown in FIG. 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 FIG. 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.

[0032] The movement of the corrugated tube 7 to the tube 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 moving speed of the second slider 18 and the first slider 19. Note that it is not necessary to set the rotation speed of the belt 17 in this manner, and for example, the rotation speed of the belt 17 may be set equal to the moving 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, and therefore the corrugated tube 7 can be prevented from being pulled in the opposite direction to the moving direction due to the friction.

[0033] The positions of the second slider 18 and the first slider 19 during the movement of the corrugated tube 7 change according to the amount of the wire 11 wound around the drum 12. Therefore, the positions of the second slider 18 and the first slider 19 can be grasped based on the amount of the 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 is connected 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. That is, the driving of the drum 12 and the driving of the belt conveyor 3 are stopped.

[0034] [3rd 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 passage position, the corrugated pipe 7 extends from the first station 1 to the second station 2.

[0035] In this process, an operator at the first station 1 (FIG. 1) connects a vacuum device 9 to the first end of the corrugated pipe 7 and operates the operation panel 6 to drive the vacuum device 9 and the air supply device 10. As a result, the air in the corrugated pipe 7 is sucked out by the vacuum device 9, and air is supplied from the air supply device 10 into the corrugated pipe 7 connected to the second slider 18 as shown in FIG. 4. As a result, the first slider 19 moves from the second end to the first end of the corrugated pipe 7 by the air pressure in the corrugated pipe 7. In other words, the first slider 19 moves in a direction to pay out the wire 11 from the drum 12 (to the right in FIG. 4). At this time, the first slider 19 moves relatively in a direction away from the second slider 18.

[0036] 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 (FIG. 1) to stop the suction device 9 and the air supply device 10. After that, the worker removes the suction device 9 from the first end of the corrugated pipe 7 to expose the first slider 19.

[0037] [4th 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 Fig. 6. In more detail, the worker fixes a connecting jig 27 to the end of the pipe 8, and screws the threaded portion 19a of the first slider 19 to the connecting jig 27, thereby connecting the first slider 19 to the end of the pipe 8.

[0038] [5th ​​step] In this process, the worker 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. The first slider 19 moving in this manner pulls the pipe 8 and passes it through the corrugated pipe 7. The position of the first slider 19 at this time can be grasped based on the amount of the wire 11 wound, which is detected by the encoder 13.

[0039] When the first slider 19 passes through the corrugated tube 7, the corrugated tube 7 is pulled in the moving direction 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 FIG. 1). In order to return the corrugated tube 7 to its original position, the stretch prevention mechanism 5 shown in FIG. 2 is driven.

[0040] More specifically, when the first slider 19 in 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 indicated by the two-dot chain line, whereby the corrugated tube 7 is clamped by the clamp 23. Furthermore, by moving the base member 22 in this state in a direction toward the first station 1 (to the right in FIG. 2), the corrugated tube 7, which has shifted position as the first slider 19 has passed, is returned to its original position.

[0041] As shown in Fig. 7, when the first slider 19 moves until it comes into contact with the small diameter portion 25 of the second slider 18 located at the second station 2, the proximity sensor 14 (Fig. 1) of 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.

[0042] [6th step] In this process, an operator at the first station 1 operates the operation panel 6 (FIG. 1) to drive a conveying device (not shown) for removing the coated pipe from the manufacturing device, and also drives the belt conveyor 3. At this time, the belt 17 rotates in the reverse direction (clockwise direction in FIG. 1). By driving the conveying device, the coated pipe moves from the pipe passing position to the preparation position, as shown in FIG. 8. The movement of the coated pipe at this time is assisted by the rotation of the belt 17 in the reverse direction. This makes it possible to reduce friction between the corrugated pipe 7 and the belt 17, and to prevent the corrugated pipe 7 from being pulled in the direction opposite to the movement direction due to the friction.

[0043] The movement of the coated pipe from the passage position to the preparation position is performed with the first slider 19 connected to the pipe 8 and the second slider 18 connected to the second end of the corrugated pipe 7. As a result, the wire 11 is paid out 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 as to be positioned near the second end of the next corrugated pipe 7 that is transported to the preparation position.

[0044] As described above, when the coated pipe moves from the passage position to the preparation position, the clamp 23 of the stretch prevention mechanism 5 shown in Fig. 2 is moved away from the corrugated pipe 7, and the corrugated pipe 7 that was clamped by the clamp 23 is released. Furthermore, the base member 22 of the stretch prevention mechanism 5 moves from the position shown by the two-dot chain line in Fig. 2 to the position shown by the solid line. Then, when the second slider 18 and the first slider 19 reach the first station 1 (Fig. 1), the conveying device and the drum 12 are stopped.

[0045] Thereafter, the worker at the first station 1 removes the second slider 18 from the second end of the corrugated pipe 7 and removes the first slider 19 from the end of the pipe 8. This makes it possible to remove the formed coated pipe from the manufacturing apparatus. Then, by repeating the above-mentioned first, second, third, fourth, fifth, and sixth steps, coated pipes are continuously manufactured.

[0046] Next, the effects of the coated pipe manufacturing apparatus and method according to this embodiment will be described. (1) When the pipe is passed through the corrugated pipe 7, the first slider 19 connected to the end of the pipe 8 moves within the corrugated pipe 7 along its center line as the wire 11 is wound around the drum 12. Accordingly, the end of the pipe 8 also moves within the corrugated pipe 7 along its center line. This prevents the end of the pipe 8 from contacting the inner wall of the corrugated pipe 7. Furthermore, this prevents the corrugated pipe 7 from meandering due to such contact, and therefore prevents the pipe 8 from becoming clogged within the corrugated pipe 7 due to the meandering. Therefore, when the pipe 8 is passed through the corrugated pipe 7, it is not necessary to take the time to clear the clog, and this can prevent a decrease in the manufacturing efficiency of the coated pipe due to the time.

[0047] (2) A worker who manufactures a coated pipe can manufacture the coated pipe simply by operating the operation panel 6 of the first station 1 to operate the manufacturing device while performing manual operations for manufacturing the coated pipe at the first station 1. This makes it possible to keep the number of workers required to manufacture the coated pipe small.

[0048] (3) 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, and the position of the corrugated tube 7 is shifted toward the second station 2. Such positional shift of the corrugated tube 7 can be eliminated by the stretch prevention mechanism 5. In other words, the corrugated tube 7 that has shifted in position as the first slider 19 passes through can be returned to its original position by the operation of the stretch prevention mechanism 5.

[0049] The above embodiment can be modified, for example, as follows: The above embodiment and the following modified examples can be combined with each other to the extent that no technical contradiction occurs. Of the air supply device 10 and the vacuum device 9 serving as the first driving device, the vacuum device 9 may be omitted.

[0050] Although air pressure has been exemplified as the fluid pressure for moving the first slider 19, other fluid pressures may also 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.

[0051] Although the wire 11 is used as the cord-like body, other materials may be used. The corrugated pipe 7 sent out from the corrugated pipe manufacturing apparatus may be moved directly to the pipe passing position without using a conveying device, etc. In this case, of the first slider 19 and the second slider 18, the second slider 18 may be omitted, and only the first slider 19 may be used as the slider.

[0052] In this configuration, the slider (first slider 19) is inserted from the second end of the corrugated pipe 7 arranged at 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 is connected to the end of the pipe 8 at the preparation position. Thereafter, the wire 11 is wound up by the drum 12, thereby moving the slider from the first end to the second end within the corrugated pipe 7, and the pipe 8 connected to the slider is pulled and passed through the corrugated pipe 7.

[0053] In this manner, a coated pipe is formed by passing the pipe 8 through the corrugated pipe 7. After formation, the coated pipe is transported outside the manufacturing device with the slider removed from the pipe 8. By repeating the above-described procedure, coated pipes are continuously manufactured.

[0054] 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 arranged at a pipe passage 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, 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 a longitudinal direction of the corrugated pipe; a first actuator configured to supply 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:

[0055] According to this configuration, when the 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 driving 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 end of the pipe from contacting the inner wall of the corrugated pipe. Furthermore, this prevents the corrugated pipe from meandering due to such contact, and thus prevents the pipe from becoming clogged inside the corrugated pipe due to the meandering. Therefore, when the pipe is passed through the corrugated pipe, it is not necessary to take the time to clear the clog, and this can prevent a decrease in the manufacturing efficiency of the coated pipe due to the time.

[0056] (1) A coated pipe manufacturing apparatus for forming a coated pipe by inserting an end of a straight corrugated pipe into a passage 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 a longitudinal direction of the corrugated pipe; a first actuator configured to supply 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 tube than the first slider and can be connected to the second end, and that can move along a movement path of the first slider; Equipped with the first slider and the second slider are capable of coming into contact with each other and being separated from each other on a moving path of the first slider, A coated pipe manufacturing apparatus in which, 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 enabling the corrugated pipe connected to the second slider to be pulled and moved to the passing position.

[0057] (2) A method for producing a coated pipe using the production apparatus according to 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 the corrugated pipe is moved 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 by the second driving device after the first step; a third step of moving only the first slider toward the first end of the corrugated tube by separating the first slider from the second slider using the first driving device while the corrugated tube is placed at the tube passing position in the second step, and of unwinding the cord 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; a sixth step of moving the coated pipe formed in the fifth step from the pipe 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 a position near a second end of a next corrugated pipe that will come to the preparation position, and unwinding the cord from the second driving device; A method for manufacturing a coated pipe comprising the steps of: [Explanation of symbols]

[0058] 1...First station, 2...Second station, 3...Belt conveyor, 4...Guide rail 1... anti-stretch mechanism, 2... operation panel, 3... corrugated pipe, 4... pipe, 5... anti-stretch 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 which comprises: pulling and moving a corrugated pipe from a first station to a second station, so as to arrange the corrugated pipe in a straight line between the first station and the second station at a pipe passage position; inserting an end of a pipe through the end of the corrugated pipe which is at the pipe passage position at the first station; and bringing the end of the pipe to the second station to form a coated pipe, A coated pipe manufacturing apparatus, comprising: a belt conveyor arranged from the first station to the second station for assisting in the movement of the corrugated pipe to the passing position.

2. A coated pipe manufacturing device comprising: a straight corrugated pipe arranged at a passage position between a first station and a second station; an end of a pipe is inserted into an end of the corrugated pipe at the first station; and the end of the pipe is brought to the second station to form a coated pipe; and the coated pipe is pulled to move it from the passage position, A coated pipe manufacturing apparatus, comprising: a belt conveyor arranged from the first station to the second station for assisting the movement of the coated pipe from the passing position.

Images