JP4430099B2 - Pipe joint manufacturing method and pipe joint manufacturing apparatus - Google Patents

Description

The present invention is, for example, for connecting a tube for use in the protection of such wires and cables, but about the production equipment of the production process and pipe joint of the pipe joint.

Conventionally, pipes have been used to protect electric wires, cables, etc., but when such pipes are buried in the ground, it is necessary to ensure waterproofness at the connecting portions. For this reason, it is necessary to waterproof the pipe joint used for connecting the pipe bodies.

As such a pipe joint having a waterproof property, for example, a pipe having a water-stop sheet, such as a water expansion sheet that expands by absorbing moisture, is known on the inner peripheral surface of the pipe body. Yes. That is, by providing the sheet in the gap between the pipe joint and the pipe connected to the pipe joint, the sheet expands due to moisture that has entered from the outside during use, filling the gap between the pipe joint and the pipe body, This prevents moisture from entering the pipe from the gap with the pipe.

15A and 15B are views showing the pipe joint 50, FIG. 15A is a perspective view showing the appearance of the pipe joint 50, and FIG. 15B is a cross-sectional view of the pipe joint 50. FIG. 16 is a cross-sectional view showing a state in which the pipe joint 50 connects the protective pipes 51a and 51b.

The pipe joint 50 is obtained by attaching a water expansion sheet 55 to the inner peripheral surface of a cylindrical spiral grooved pipe 53. The pipe joint 50 is provided with a water expansion sheet 55 at a contact portion with the protective pipes 51a and 51b since protective pipes and the like connected from both ends thereof are inserted. Since the pipe joint 50 has the spiral groove 54 on the inner peripheral surface, the water expansion sheet 55 is attached along the inner peripheral surface irregularities of the pipe joint 50 formed by the spiral groove 54.

In order to connect the protective pipes 51a and 51b by the pipe joint 50, for example, the following may be performed. That is, from one end of the pipe joint 50, the protective pipe 51a is inserted while screwing the protective pipe 51a and the spiral groove 54 of the pipe joint 50, and screwed to the other end.

Next, the end of the protective pipe 51b is abutted with the end of the protective pipe 51a, and the pipe joint 50 is rotated in the reverse direction. That is, the pipe joint 50 is rotated in a direction in which the pipe joint 50 is detached from the protective pipe 51a and in a direction in which the pipe joint 50 is screwed in the protective pipe 51b. The connection is completed when the butted portion 52 of the protective piping 51a, 51b comes to the approximate center of the pipe joint 50.

The protection pipes 51a and 51b and the pipe joint 50 connected in this manner have the water expansion sheet 55 disposed in the gap between the connection portions. Therefore, when moisture enters from the outside, the water expansion sheet 55 is It expand | swells and the clearance gap between the pipe joint 50 and protective piping 51a, 51b can be filled, and the penetration | invasion of the water | moisture content in the protective piping 51a, 51b can be prevented.

As such a pipe joint, for example, there is a pipe joint in which a water expansion sheet is attached to a surface of the connection portion of the pipe body facing the pipe body (Patent Document 1).

In addition, after disposing a water expansion sheet on the inner peripheral surface of a cylindrical body member formed in advance, the core material was press-fitted while rotating into the main body member, and the inner peripheral surface of the main body member was provided. There exists a manufacturing method of a pipe joint which fixes a water expansion sheet in a body member with an adhesion ingredient (patent documents 2).
JP 2003-278773 A Japanese Patent No. 3678742

However, the pipe joint described in Patent Document 1 has a problem in that quality variation tends to occur because the water expansion sheet is manually attached to the inner peripheral surface of the main body member. In particular, when the main body member has a spiral groove, it is necessary to stick the water expansion sheet along the spiral groove, which is difficult to work, and there is a risk of poor attachment or leakage of the connection due to this. There is a problem that there is.

Further, in the method of manufacturing a pipe joint described in Patent Document 2, the pipe joint can be easily manufactured. However, in order to press-fit the core material into the main body member, the pressing force that presses the water expansion sheet to the inner peripheral surface of the main body member. There is a problem that cannot be changed. That is, in this manufacturing method, the pressing force of the water expansion sheet is uniformly determined by the outer diameter of the core mold member, the inner diameter of the main body member, and the thickness of the water expansion sheet. For this reason, there is a problem that the pressing force of the water expansion sheet changes due to the dimensional error and deformation of the main body member, the thickness error of the water expansion sheet, and the quality is not stable. Furthermore, such a method of press-fitting the core material into the main body member cannot cope with design changes such as changes in the material and thickness of the water expansion sheet, and there is a problem that the core material needs to be recreated.

In addition, core materials having different external shapes are required for changing the pressing force. For this reason, when handling the water expansion sheet | seat from which thickness differs, there exists a problem that it is necessary to prepare the core type material of a different size for every thickness. Furthermore, since the core material is press-fitted inwardly from the end of the main body member, the water expansion sheet is likely to be wrinkled or turned up inside the main body member, resulting in a quality problem.

In particular, when the main body member has a spiral groove, in order to press the entire water-expandable sheet, the core material is set in accordance with the number of groove pitches of the tubular body by the length corresponding to the pasting length of the sheet member. It is necessary to rotate it by the required number and insert it into the pipe joint, and then reverse it by the same number of rotations as it was inserted to return it to the base. As a result, compared to the insertion start portion, the insertion end portion has a smaller number of rotations for pressing by the number of movements of the spiral groove necessary for insertion of the core material, and ensures the adhesion of the insertion end portion. As a result, the pressure is more than necessary. Furthermore, if the rotational speed of the core material is increased, the sheet member may not be pressed uniformly, so that it is difficult to increase the attaching speed and the productivity is poor. Furthermore, if the inner peripheral surface of the main body member is smooth or a spiral groove, it is possible to press-fit the core material, but in the bellows tube or the like having independent grooves in which annular grooves are provided at regular intervals, in this manufacturing method, There is a problem that the water expansion sheet cannot be attached.

The present invention has been made in view of such problems, has good productivity, can obtain stable quality, and the thickness and material of the water-stop sheet to be attached to the pipe joint are changed. Or when it is desired to change the pressing force that presses the sheet against the pipe body, it has a pipe joint or a straight groove having not only a spiral groove but also an independent groove on the peripheral surface of the pipe body. It is an object of the present invention to provide a method for manufacturing a pipe joint and the like that can manufacture a pipe joint and a different type pipe joint.

In order to achieve the above-described object, the first invention provides a grooved tubular body having a spiral groove formed continuously in the tubular body or a plurality of annular grooves formed independently of the tubular body. On the other hand, the surface of the grooved tube that fits the grooved tube through the sheet member inside the grooved tube disposed along the inner peripheral surface of the grooved tube is grooved. After inserting the pressing body having a convex portion in the tube axis direction corresponding to the groove shape of the tubular body, the pressing body is brought into contact with the sheet member, and the pressing body is further in the circumferential surface of the tubular body with respect to the sheet member. This is a method for manufacturing a pipe joint, in which the pipe body is rotated by pressing the sheet member and the sheet member disposed on the inner peripheral surface of the grooved pipe body is bonded or crimped.

Here, the pressing body is a member such as a core bar for pressing the sheet member against the peripheral surface of the tubular body. The sheet member is a sheet-like member having a property of expanding when water is absorbed, such as a water expansion sheet. Moreover, a pipe means the cylinder used as the base material of the pipe joint and pipe joint to manufacture.

When the sheet member is disposed along the inner peripheral surface of the grooved tubular body, the sheet member is temporarily fixed to at least one place on the inner peripheral surface of the tubular body, and the sheet member is You may arrange | position so that it may not move with respect to an internal peripheral surface.

In the above-described method of manufacturing a pipe joint, instead of rotating the grooved tube, the pressing body may be rotated, or both the grooved tube and the pressing body may be rotated. Further, since the length of the pressing body is preferably a length capable of pressing the sheet member at a time, it is equal to the length of the sheet member to be attached to the tubular body, or the pressing body is pressed at the time of pressing from the length of the sheet member. It is desirable that the moving distance is long. If the entire length of the sheet member can be pressed at a time, the pressing force, temperature, and rotation speed can be adjusted, and bonding or crimping can be performed with a small number of rotations (a pressing body moving distance corresponding to a small number of rotations). Is also possible.

In the above-described method for manufacturing a pipe joint, a linear pipe body is used instead of the grooved pipe body, and instead of a pressing body having a convex portion in the pipe axis direction to be fitted thereto, a linear shape is provided in the pipe axis direction. A pressing body having a portion can also be used. Here, the straight tubular body refers to a tubular body having an inner peripheral surface with no irregularities such as a groove or a main body having no irregularities on the inner peripheral surface of the pipe.

In addition, the adhesion of the sheet member arranged on the inner peripheral surface of the grooved tubular body can be performed by heating, and the adhesiveness can be improved by heating and performing the bonding without heating. Bonding can be easily performed in a short time. The sheet member can be attached to the tube by pressure bonding without using an adhesive. For example, by pressing a sheet member in which a polyester fiber or the like is mixed with a woven or non-woven fabric containing water-expandable fibers with a heated pressing body, the polyester fiber is plasticized and embedded in a tubular resin, and the sheet member and the tubular body Resin can be crimped. Here, the polyester fiber has the same effect as the hot melt adhesive.

Thus, the sheet member can be attached to the tube body by pressing, either by bonding or by pressure bonding. Of course, not only applying an adhesive to the outer surface of the sheet member, but also mixing and pressing can be performed simultaneously by mixing polyester fibers in the water expansion sheet member and heating and pressing. In the case of pressure bonding, the polyester fiber mixed in the sheet member is partially melt-plasticized and fused to the tubular resin.

In this way, when the sheet member includes polyester fiber or the like, when the sheet member is released from the pressure, the sheet member is slightly shaped from the shape formed in accordance with the shape of the peripheral surface of the tubular body at the time of pressing. Although it tries to recover to the shape before pressing, the melted polyester fiber has the effect of fixing and restraining the sheet member at the position at the time of pressing. is there.

According to 1st invention, the press body which presses a sheet | seat member to a tubular body is inserted to the tubular peripheral surface, without contacting the said sheet member etc., so that it may not move to a tubular body circumferential surface with a groove | channel after that. Since the pressing of the disposed sheet member is started, the insertion speed can be increased. Further, since the pressing body presses the entire length of the sheet member against the tube body, it is sufficient to rotate the tube body at least by one rotation or a few rotations of two or three rotations, but depending on the type of adhesive and the bonding conditions May require rotation. In addition, since pressing is performed after the pressing body is inserted, not only a tubular body having a spiral groove or a tubular body without a groove, but also a tubular body having independent grooves in which annular grooves are provided at regular intervals. A sheet member can be attached to the inner peripheral surface.

In addition, since the insertion and pressing of the pressing body are completely separate processes, the pressing force can be freely adjusted, and even when handling a sheet member having a different thickness, without replacing the pressing body, The same pressing body can be used. Furthermore, if the sheet member is bonded by heating the sheet member or the pressing body, the sheet member can be formed and bonded reliably and easily, and a hot melt adhesive can be used, thereby shortening the bonding time. By using a sheet member containing a polyester fiber having thermocompression bonding, the tube body and the sheet member can be bonded without using an adhesive.

In the first aspect of the invention, when the sheet member is disposed on the grooved tubular peripheral surface, it is desirable that the sheet member does not move relative to the grooved tubular peripheral surface. In this case, it is desirable to temporarily fix with an adhesive, but it is also possible to fix using a fixing means such as a pin. Needless to say, when fixing with a fixing member such as a pin, it is necessary to remove the fixing member such as a pin after the manufacture of the pipe joint. In addition, when temporarily fixing with an adhesive, it is only necessary to prevent the sheet member from moving, so it may be temporarily fixed to at least a part of the peripheral surface of the tubular body, and the entire sheet member can be temporarily fixed, It is not always necessary to temporarily fix the whole, and whether the temporary fixing is a part or the whole can be appropriately selected as necessary.

In addition, when manufacturing a pipe joint only by adhesion | attachment, it is necessary to apply | coat an adhesive so that the whole sheet | seat member may be covered, but when manufacturing a pipe joint by crimping | bonding, the adhesive should just apply | coat to the extent which can be temporarily fixed. . Moreover, when manufacturing a pipe joint using the effect of both adhesion | attachment and crimping | bonding, it is necessary to apply | coat an adhesive agent to the whole surface. Thus, the application of the adhesive can be changed according to the manufacturing method of the pipe joint.

For this reason, it is excellent in productivity and workability. Furthermore, the sheet member can be attached to both types of pipe joints of independent grooved pipes and spiral grooved pipes only by changing the pressing body, and both types of pipe joints can be manufactured. Since there is no press-fitting step, there is no turning of the sheet member and the pressing force can be adjusted, and therefore a method of manufacturing a pipe joint capable of obtaining stable quality even if the thickness and material of the sheet member are different is provided. be able to.

According to a second aspect of the present invention, the sheet member is grooved with respect to a grooved tube body having a spiral groove formed continuously in the tube body or a plurality of annular grooves formed independently of the tube body. According to the groove shape of the grooved tube body on the surface of the grooved tube body fitted through the grooved tube body and the sheet member inside the grooved tube body arranged along the inner peripheral surface of the tube body After inserting a pressing body having a convex portion in the tube axis direction, the pressing body is brought into contact with the sheet member, and the wrap portion of the sheet member is pressed against the peripheral surface of the tubular body by the pressing body, and the wrap portion Is bonded or pressure-bonded to the circumferential surface of the tubular body, and after reducing the thickness of the sheet member of the wrap portion, the tubular body is pressed against the sheet member against the circumferential surface of the tubular body. Rotate to bond or crimp the sheet member placed on the inner peripheral surface of the grooved tube It is a manufacturing method of the pipe joint of manufacturing the pipe joint.

When the sheet member is disposed along the inner peripheral surface of the grooved tubular body, the sheet member is temporarily fixed to at least one place on the inner peripheral surface of the tubular body, and the sheet member is What is necessary is just to arrange | position so that it may not move with respect to an internal peripheral surface, and you may temporarily fix | stop the said lap | wrap part of the said sheet member to the internal peripheral surface of the said tubular body. Of course, you may fix a sheet | seat member to the whole internal peripheral surface of a tubular body at this time. Whether the sheet member is fixed to one place on the inner peripheral surface of the pipe body or whether the sheet member is fixed to the entire inner peripheral surface of the pipe body depends on the type of adhesive, the pressing condition of the sheet member, the rotational speed of the pipe body, etc. It can be determined as appropriate in consideration of the above conditions.

The rotation direction of the tubular body when rotating the tubular body while pressing the pressing body against the sheet member against the peripheral surface of the tubular body is formed by the inner end portion of the wrap portion. It may be a direction that does not climb over the step. Note that the direction in which the pressing body does not run over the step formed by the inner end of the lap portion is a direction in which the spiral grooved tube 3 is rotated in the Z direction in FIG.

By doing in this way, besides the effect in 1st invention, the thickness of a lap | wrap part can be brought close to thickness other than a lap | wrap part, and it can be made easy to use as a pipe joint. In particular, when the sheet member is temporarily fixed to the inside of the tube body, only a part of the sheet member can be temporarily fixed to the inside of the tube body, or the entire sheet member and the entire peripheral surface of the tube body are temporarily fixed. May be. Only a part of the sheet member may be temporarily fixed, for example, only the lap part may be temporarily fixed.

Further, the rotation direction of the tubular body when rotating the tubular body while pressing the sheet member against the tubular body is a direction in which the wrap portion does not turn, so there is no fear that the sheet member is turned over when pressed.

According to a third aspect of the present invention, there is provided a pressing body that presses the inner peripheral surface of the tubular body, a moving means that moves the pressing body into and out of the tubular body, and a press that presses the pressing body against the inner peripheral surface of the tubular body. And a rotating means for rotating the tube body and / or the pressing body. The moving means moves the pressing body into the tube body, and the pressing means causes the pressing body to move to the tube. Applicable to any of an independent grooved tube, a spiral grooved tube, and a straight tube body, wherein the tube and / or the pressing body is rotated by the rotating means while being pressed against the inner peripheral surface of the body. It is a manufacturing apparatus of a possible pipe joint.

The tubular body may have a groove on an inner peripheral surface, and the pressing body may have a convex portion corresponding to the shape of the groove. The moving means applies a force to the pressing body when moving the pressing body, and the pressing body does not receive a force from the moving means while the tube is rotating. Moreover, it is desirable that the pressing means be able to adjust the pressing force of the pressing body on the peripheral surface of the tubular body as necessary.

According to the third invention, the pressing body that presses the sheet member against the tubular body is inserted to the peripheral surface of the tubular body without coming into contact with the sheet member and the like, and then starts pressing, so the insertion speed is increased. Can do. Further, in order for the pressing body to press the entire length of the sheet member against the tube body, the length of the pressing body may be made longer than the sheet member length by a predetermined amount. May be rotated once, but a predetermined number of rotations may be performed as necessary.

Further, since the pressing is performed after the pressing body is inserted, the sheet member can be attached to the inner peripheral surface of the tubular body having the independent grooves provided with the annular grooves at regular intervals. Moreover, since the insertion and pressing of the pressing body are completely separate processes, the pressing force and the pressing amount can be adjusted freely, and the groove shape of the tubular body is constant even when handling sheet members having different thicknesses. If it is, the same press body can be used.

In addition, when the sheet member is arranged around the entire circumference of the tubular body and the end portion of the sheet member is butted, the butted portion of the sheet member becomes a water channel, and there is a possibility that water may invade from the sheet. The end of the member may be wrapped. If the manufacturing apparatus of the present invention is used, after wrapping the sheet member, first, at this position, only the wrap portion is pressed with a pressing body, and the thickness of the sheet member of the wrap portion is thinly formed into the shape of the peripheral surface of the tubular body. At the same time, the sheet member can be attached to the peripheral surface of the tubular body, and then the pipe joint can be rotated, and the entire periphery including the portion other than the wrap portion of the sheet member can be molded and pasted according to the peripheral surface of the tubular body. . As described above, the pipe joint manufacturing apparatus according to the present invention can be pressed without rotating the tube body while the pressing member is pressed against the sheet member, or can be pressed while rotating the tube body with respect to the pressing member. It is also possible.

For this reason, it is excellent in productivity, and it is possible to affix a sheet member to an independent grooved pipe, it is excellent in workability, and since there is no press-fitting process, a pipe joint that can obtain stable quality can be obtained. A manufacturing apparatus can be provided.

According to the present invention, productivity is good, stable quality can be obtained, and when the thickness of the water-stop sheet attached to the pipe joint is changed, or the sheet is pressed against the pipe body. It is possible to provide a method for manufacturing a pipe joint that can easily cope with a change in pressing force.

Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a diagram showing a pipe joint manufacturing apparatus 10 according to the first embodiment. FIG. 1 (a) is a configuration diagram of the pipe joint manufacturing apparatus 10, and FIG. FIG. 6 is a view of the pressing roller 15 as viewed in the H direction.

A pair of support portions 18 are provided on the base 30, and the shaft 14 of the rotating roller 11 is rotatably provided on the support portions 18. A motor 13 for driving the rotary roller 11 is provided on the base 30 at the side of the support portion 18. Grooves 12 are provided near both ends of the rotating roller 11. The shaft 14 is connected to a motor 13, and the rotating roller 11 can be rotated in both forward and reverse directions by the motor 13.

A tube holding cylinder 17 is installed above the rotating roller 11. The tube pressing cylinder 17 has a tube pressing rod 19, and the end of the tube pressing rod 19 is provided on the support portion 20. The shaft 16 of the pressing roller 15 is rotatably provided on the support portion 20. Therefore, the pressing roller 15 can be moved in the directions of arrows A and B in the drawing according to the operation of the tube pressing cylinder 17. The tube pressing cylinder 17 is attached to the base 30 by a gantry not shown.

As shown in FIG. 1B, each of the rotating roller 11 and the pressing roller 15 is composed of a pair of rollers, and the rollers are provided in parallel. The manufactured spiral grooved tube 3 is placed between a pair of rotating rollers 11. The pair of rotating rollers 11 rotate in the same direction (for example, the X direction in the figure). At this time, the pressing roller 15 also rotates in the same direction as the rotating roller 11 as the tube rotates.

A core metal mount 27 is provided on the base 30. A cored bar pressing cylinder 23 is provided on the upper part of the cored bar mount 27 in the vertical direction. The metal core pressing cylinder 23 is provided with a metal core arm 26 via a metal core pressing rod 25. A core metal 21 as a pressing body is detachably provided on the core metal arm 26. Therefore, the cored bar 21 (pressing body) can move in the directions of arrows C and D in the figure according to the operation of the cylinder 23 for pressing the cored bar. A heater (not shown) is provided inside the cored bar 21. Therefore, the temperature of the cored bar 21 can be adjusted.

Here, since the core bar 21 can be removed from the core bar arm 26, it can be exchanged according to the type of the pipe joint 1. The shape of the cored bar 21 is determined by the shape of the pipe joint 1 to be manufactured. That is, there is no groove-like unevenness on the inner peripheral surface of the pipe joint 1, that is, for the manufacture of the pipe joint 1 in which a linear pipe body is used, the pressing surface of the core metal 21 is also formed in the inner peripheral surface shape of the pipe joint 1. Correspondingly, it may be linear (no irregularities). In addition, when the inner peripheral surface of the pipe joint 1 has a groove-like unevenness, the shape of the core metal 21 may be an uneven shape corresponding to the inner peripheral surface uneven shape of the pipe joint 1, for example, a groove shape What is necessary is just to have the convex part 22 corresponding to.

In addition, when the pipe joint 1 has a groove | channel on an internal peripheral surface, the shape of the metal core 21 is mainly determined by the depth and pitch of the groove | channel which the pipe joint 1 has. That is, if the depth and pitch of the grooves of the pipe joint 1 are the same, the core bar 21 having the same shape can be used regardless of the thickness of the water expansion sheet 5 (sheet member) to be attached. Furthermore, if the groove pitches are the same, even if the inner diameters of the pipe joints 1 to be manufactured are different to some extent, the same shape of the cored bar 21 can be used.

Moreover, it is desirable that the core metal 21 is slightly longer than the length of the pipe body of the pipe joint 1 to be manufactured. (To be precise, when a sheet member is attached to the peripheral surface of the pipe body over the entire length of the pipe body, it is desirable that the length of the pipe body is longer than the length of the pipe by the moving distance at the time of molding. When the length of the expansion sheet 5 is shorter than the tube length, it is desirable that the length of the expansion sheet 5 is substantially the same as the length of the water expansion sheet 5 or the length of the water expansion sheet 5 plus the moving distance of the pressing body.

The base 30 is provided with a core metal sliding cylinder 29 and a guide rail 33, and the core metal rack 27 is provided so as to be movable on the guide rail 33. The guide rail 33 is disposed up to the vicinity of the support portion 18 of the rotating roller 11. In addition, a cored bar slide rod 31 of a cored bar slide cylinder 29 is provided on the cored bar mount 27, and a cored bar slide rod 31 of the cored bar mount 27 is connected thereto. Therefore, the metal core mount 27 can slide on the guide rail 33 in the directions of arrows E and F in the drawing according to the operation of the cylinder 29 for mandrel slide. That is, when the mandrel 27 is slid, the mandrel pressing cylinder 23 and the mandrel 21 provided on the mandrel 27 are similarly moved in the directions of arrows E and F in the figure.

A stopper 35 is provided on the guide rail 33 in the vicinity of the support portion 18 in order to stop the core metal rack 27 at an accurate position during the sliding operation of the metal core rack 27. The metal core 27 comes into contact with the stopper 35 and stops the sliding operation during the sliding operation in the direction of arrow E in the figure. For this reason, the stopper 35 is attached so that the position can be freely changed on the guide rail 33 according to the type of the pipe joint to be manufactured.

A limit switch (not shown) is provided near the stopper 35. The limit switch detects the position where the cored bar mount 27 is stopped by the stopper 35 when the cored bar 21 is slid in the direction of arrow E in the figure.

Here, the materials of the rotating roller 11 and the pressing roller 15 are not specified, but in order to suppress slipping with the pipe joint 1 to be processed, a material that is difficult to slip is preferable, and rubber, resin, or the like can be used. Moreover, although the motor 13 is not specified, a normal electric motor may be sufficient. Moreover, although the material of the metal core 21 is not specified, a material that is easy to slide with the water expansion sheet 5 and that is not easily deformed is preferable, and metal, resin, or the like can be used.

As the tube pressing cylinder 17, the cored bar pressing cylinder 23, and the cored bar sliding cylinder 29, an electric actuator or the like can be used in addition to a hydraulic cylinder and an air cylinder. As will be described later, the core metal sliding cylinder 29 does not apply an external force to the core metal rack 27 except during the sliding operation of the core metal rack 27. At this time, when an external force is applied to the cored bar mount 27 from other places, the cored bar mount 27 freely slides on the guide rail 33 without receiving a reaction force from the cored bar sliding cylinder 29. It is necessary to be in a state that can be performed (the direction of arrow E and arrow F in the figure). For this reason, it is desirable that the core metal sliding cylinder 29 is an air cylinder having a simple structure.

Further, the cylinder 23 for pressing the core metal simply adjusts the pressing force of the core metal 21 and can maintain the pressing force against the water expansion sheet 5 at the time of manufacturing the pipe joint 1. A simple air cylinder is desirable. In this case, the maximum pressing force of the cored bar 21 can be adjusted by the supply air pressure. Further, by providing a relief valve in the core pressing cylinder 23, the pressing force of the core 21 can be adjusted to be kept constant without being excessively high.

Moreover, the pipe joint manufacturing apparatus 10 has a control unit (not shown). The control unit is connected to various sensors and operating units provided in the pipe joint manufacturing apparatus 10 and controls the operation of the pipe joint manufacturing apparatus 10. In the following description, it is simply referred to as “control unit”.

Next, the operation of the pipe joint manufacturing apparatus 10 according to the present embodiment and the method for manufacturing the pipe joint 1 will be described. FIG. 2 is a view showing a state in which the water expansion sheet 5 is installed in the spiral grooved tube 3, FIG. 2 (a) is a perspective view of the spiral grooved tube 3, and FIG. 2 (b) is the spiral grooved tube 3. Sectional drawing and FIG.2 (c) are the figures which looked at the spiral grooved tube 3 from the axial direction.

First, as shown in FIG. 2, the water expansion sheet 5 as a sheet member is inserted into the inner peripheral surface of the spiral grooved tube 3 as a tubular body. The spiral grooved tube 3 is a tube in which a continuous spiral groove 7 is formed on the inner peripheral surface. The water expansion sheet 5 is previously rolled into a cylindrical shape slightly smaller than the inner diameter of the spiral grooved tube 3 so as to be accommodated in the spiral grooved tube 3 and inserted so as to be in contact with the inner peripheral surface of the spiral grooved tube 3. Is done. At this time, the water expansion sheet 5 is slightly longer than the inner peripheral length of the spiral grooved tube 3 so that the wrap portion 9 is generated in a part of the water expansion sheet 5.

Here, the wrap portion 9 refers to a portion where both ends of the water expansion sheet 5 overlap each other when the water expansion sheet 5 is rolled into a cylindrical shape. If the wrap portion 9 is not provided, a gap is generated between the water expansion sheets 5 after the pasting process, and there is a risk of water intrusion from there. In addition, it is necessary to wrap the wrapping direction of the wrap portion 9 in a direction in which no turning is caused by the rotation of the spiral grooved tube 3 in the pressing process by the core metal 21 described later. The direction in which no turning occurs is the rotational direction in which the end of the upper member of the wrap portion does not hit the pressing member during rotation, and the upper end of the wrap portion (the sheet on the inside of the tube) along the wrap portion. The direction is from the end) toward the lower end (the sheet end that is the outside of the tube).

It is desirable that at least one location of the water expansion sheet 5 is temporarily fixed to the spiral grooved tube 3 in a state where the water expansion sheet 5 is accommodated in the tube. In order to temporarily fix the water expansion sheet 5 to the spiral grooved tube 3, the entire circumference of the water expansion sheet 5 may be temporarily fixed to the inner peripheral surface of the spiral grooved tube 3 with an adhesive or the like. Only a part of the water expansion sheet 5 may be temporarily fixed to the inner peripheral surface of the spiral grooved tube 3.

For example, when only a part of the water expansion sheet 5 is temporarily fixed to the inner peripheral surface of the spiral grooved tube 3, an adhesive previously applied to the outer peripheral surface of the water expansion sheet 5 located in the lap portion 9 is used. Temporarily fix to the inner peripheral surface of the spiral grooved tube 3. In this case, a portion of the water expansion sheet 5 other than the temporarily-wrapped wrap portion 9 may have a gap with the inner peripheral surface of the spiral grooved tube 3, but the rounded water expansion sheet 5 is self-supporting. Therefore, it is not crushed in the spiral grooved tube 3 and can be maintained while maintaining a substantially cylindrical shape.

Protrusions 4 are provided at both ends of the spiral grooved tube 3. When the spiral grooved tube 3 is set on the rotating roller 11, the protrusion 4 is fitted into the groove 12 of the rotating roller 11, and the set position of the spirally grooved tube 3 is made constant. This is to prevent the spiral grooved tube 3 from being displaced on the rotating roller 11 during processing. An adhesive is applied in advance to the outer peripheral surface of the inserted water expansion sheet 5 or the inner peripheral surface of the spiral grooved tube 3. Therefore, the water expansion sheet 5 is bonded along the spiral groove on the inner peripheral surface of the spiral grooved tube 3 by pressing the water expansion sheet 5 to the inner peripheral surface of the spiral grooved tube 3 by the cored bar 21 described later. Moreover, if the water expansion sheet 5 uses a thermocompression-bonding sheet, the water expansion sheet 5 can be bonded along the spiral groove on the inner peripheral surface of the spiral grooved tube 3.

In FIG. 2, the spiral grooved tube 3 has different water expansion sheets 5 inserted from both ends of the spiral grooved tube 3, but one sheet of the water expansion sheet 5 is inserted into the entire length of the spiral grooved tube 3. You may make it stick over (all inner peripheral surfaces).

Here, as the material of the water expansion sheet 5, it is only necessary to absorb water and expand, and for example, a water expansion nonwoven fabric or a sheet in which an expansion material is applied, or a sheet in which the expansion material itself is used is used. it can. The adhesive may be a general adhesive. For example, an adhesive such as a synthetic rubber type or a vinyl type can be used. When the cored bar 21 is heated, a hot melt adhesive should be used. You can also. Typical hot melt adhesives include polyester and polyamide adhesives.

In addition, the material of the spiral grooved tube 3 is not specified and can be used for both resin and metal. However, considering the cost, it is desirable to use resin. Resin is more preferable than metal. As a material of the spiral grooved tube 3, for example, polyethylene, general-purpose plastic, polypropylene, vinyl chloride resin, ABS resin, hard rubber, and the like can be used. These materials need to be appropriately selected depending on the purpose of use.

Next, the operation of the pipe joint manufacturing apparatus 10 will be described. FIG. 3 is a flowchart showing the operation of the pipe joint manufacturing apparatus 10, and FIGS. 4 to 11 are diagrams showing the manufacturing process of the pipe joint 1.

First, as shown in FIG. 4, the spiral grooved tube 3 in which the water expansion sheet 5 is installed is set on the rotating roller 11. At this time, the protruding portion 4 of the spiral grooved tube 3 is set so as to be aligned with the groove 12 of the rotating roller 11. Thereby, the set position of the spiral grooved tube 3 can always be made constant. The control unit of the pipe joint manufacturing apparatus 10 detects that the spiral grooved pipe 3 is installed by using a photoelectric sensor or the like (not shown), and detects whether the installation position is appropriate (step 101). Although details will be described later, when the spiral grooved tube 3 is set, it is set so that the wrap portion 9 of the internal water expansion sheet 5 is located below the inner peripheral surface of the spiral grooved tube 3.

As shown in FIG. 5, when the control unit confirms that the spiral grooved tube 3 is set at an appropriate position, the control unit operates the tube pressing cylinder 17 and lowers the pressing roller 15 (indicated by the arrow in the figure). A direction), the spiral grooved tube 3 is pressed by the pressing roller 15 (step 102). At this time, the tube pressing cylinder 17 detects the pressing position of the spiral grooved tube 3 of the pressing roller 15 and the pressing force at that time by a limit switch or a pressure sensor (not shown), and the pressing position and pressing force are detected. It is confirmed that the force is normal (step 103).

Next, as shown in FIG. 6, the control unit operates the mandrel slide cylinder 29. Accordingly, the cored bar 27 and the cored bar pressing cylinder 23 and the cored bar 21 connected thereto are also moved in the E direction (step 104), and the cored bar 21 is inserted into the spiral grooved tube 3. Is done. When the core metal mount 27 moves to the position of the stopper 35 which is a preset stop position, the core metal sliding cylinder 29 stops operating (step 105). At this time, the control unit detects that the mandrel mount 27 has moved up to the stopper 35 with the aforementioned limit switch.

Next, as shown in FIG. 7, the control unit operates the mandrel pressing cylinder 23 to lower the mandrel arm 26 and the mandrel 21 attached thereto (C direction in the figure) (step 106). ).

FIG. 8 is a cross-sectional view when the cored bar 21 is lowered in the spiral grooved tube 3, FIG. 8 (a) is a diagram showing a state in which the cored bar 21 is inserted, and FIG. It is a figure which shows the state which the metal core 21 descend | falls and the water expansion sheet 5 was pressed. When the core metal 21 is lowered, the water expansion sheet 5 inserted into the spiral grooved tube 3 is pressed against the inner peripheral surface of the spiral grooved tube 3 by the core metal 21. Here, the metal core 21 has a convex portion 22 corresponding to the concave and convex shape formed by the groove 7 on the inner peripheral surface of the spiral grooved tube 3. For this reason, the metal core 21 presses the water expansion sheet 5 along the groove 7 on the inner peripheral surface of the spiral grooved tube 3.

Further, as described above, if the core metal 21 is made longer than the length of the pipe joint 1 to be manufactured by the moving distance of the core metal 21 for adhesion or pressure bonding by pressing, the spiral grooved tube 3 is formed over the entire length of the core metal 21. Can be pressed. As described above, the length of the cored bar 21 is desirably long by the moving distance of the cored bar 21. However, even if the cored bar is shortened or the pressing part is not provided on the entire length of the cored bar, the tubular body is reversed. May be shaped by pressing repeatedly or repeatedly.

The heating temperature of the heater varies depending on the type of the water expansion sheet 5 and the adhesive, but the water expansion sheet does not change in quality, and a range in which the adhesive has good adhesiveness may be appropriately selected. Often set to ° C. If the temperature is higher than this, the water-expandable sheet is altered, and if it is about 60 ° C. or lower, the adhesive effect of the adhesive cannot be sufficiently obtained.

Moreover, the cored bar 21 can be heated to a set temperature by a heater provided in the cored bar 21 as necessary. When the cored bar 21 is heated and used, the heater can be preheated to a predetermined set temperature. In this case, the control unit can control the temperature within a predetermined temperature range so that the core metal 21 falls within the set temperature range. In addition, by heating the core metal 21, when the core metal 21 presses the water expansion sheet 5, the water expansion sheet 5 is formed into an uneven shape formed by the grooves 7 on the inner peripheral surface of the spiral grooved tube 3. Since the molding is facilitated and the adhesiveness is improved, the two can be easily and reliably bonded. Further, when a hot melt adhesive is used for bonding the water expansion sheet 5 and the spiral grooved tube 3, bonding in a short time is possible.

Furthermore, if the water expansion sheet 5 of thermocompression bonding is used for the water expansion sheet 5, the water expansion sheet 5 and the spiral grooved tube 3 are pressure bonded by pressing the water expansion sheet 5 heated to a predetermined temperature with a pressing member. can do.

Further, the wrap portion 9 of the water expansion sheet 5 in the spiral grooved tube 3 is set so as to come below the spiral grooved tube 3. In this state, after the lap portion 9 of the spiral grooved tube 3 is pressed, the spiral grooved tube 3 is rotated. For this reason, the cored bar 21 first presses the wrap portion 9. Thereby, the water expansion sheet 5 can be affixed uniformly on the inner peripheral surface of the spiral grooved tube 3, and the rotation of the spiral grooved tube 3 can be made constant.

The core metal pressing cylinder 23 can adjust the pressing force as described above, and can adjust the pressing force with which the metal core 21 presses the water expansion sheet 5. Further, the cored bar pressing cylinder 23 can always press the water expansion sheet 5 with a constant force by the set pressing force. That is, even when the water expansion sheets 5 having different thicknesses are attached to the same spiral grooved tube 3, the same core metal 21 can be used.

Further, the cored bar pressing cylinder 23 can press the water expansion sheet 5 with a pressing force suitable for the type of the water expansion sheet 5 according to the type of the water expansion sheet 5. Further, even when a portion having a different thickness such as the wrap portion 9 is pressed or due to deformation of the spiral grooved tube 3 or a dimensional error, the pressing force with which the core metal 21 presses the water expansion sheet 5 does not vary. The core metal pressing cylinder 23 can always press the metal core 21 against the water expansion sheet 5 with a constant force.

The mandrel pressing cylinder 23 is provided with a pressure sensor (not shown) and the like, and the control unit detects the pressing force of the mandrel 21 (pressure of the mandrel pressing cylinder 23). When the pressing force of the mandrel 21 falls within the set pressing force range, the control unit drives the motor 13 to rotate the rotating roller 11 (in the direction of arrow X in the figure) as shown in FIG. 9 (step 107). 108). Thereby, the spiral grooved tube 3 rotates between the rotating roller 11 and the pressing roller 15 (in the direction of arrow Y in the figure).

At this time, the mandrel slide cylinder 29 is completely free to operate in the axial direction (the direction of arrows E and F in the figure). That is, the core metal sliding cylinder 29 not only applies an external force to the core metal 21 but also does not apply a reaction force to the force received from the core metal 21. Therefore, the core metal mount 27 can freely slide on the guide rail 33.

The cored bar 21 is screwed into the spiral groove 7 of the spiral grooved tube 3. For this reason, since the cored bar 21 is fitted to the groove 7 of the spiral grooved tube 3 through the sheet member by the rotation of the spiral grooved tube 3, the axis of the pipe joint with respect to the spirally grooved tube 3. Try to move in the direction. On the other hand, the cored bar 21 can be freely slid in the axial direction (the direction of arrow E and arrow F in the figure) in the same manner as the cored bar mount 27. Therefore, with the rotation of the spiral grooved tube 3, the core metal 21 (core metal mount 27) follows the spiral groove 7, and the axial direction of the pipe joint according to the rotation direction (for example, the direction of arrow F in the figure). Move to one of the following.

In addition, the rotation direction of the rotating roller 11 (spiral grooved tube 3) is not specified. When the spiral grooved tube 3 has the spiral groove 7 as in the present embodiment, the convex portion 22 of the cored bar 21 and the groove 7 on the inner peripheral surface of the spiral grooved tube 3 as described above. By the screwing, the cored bar 21 moves in the axial direction of the spiral grooved tube 3 (in the direction of arrow E and arrow F in the drawing) as the spiral grooved tube 3 rotates. In this case, the rotational direction of the spiral grooved tube 3 may be any direction as long as the wrap portion 9 of the spiral grooved tube 3 is not turned over. However, since there is a risk of interference between the cored bar arm 26 and the spiral grooved tube 3 during rotation, the cored bar 21 is preferably moved in the direction of retreating backward (in the direction of arrow F in the figure). It is desirable to rotate the spiral grooved tube 3.

The direction in which the wrap portion 9 of the spiral grooved tube 3 is not turned is a rotation direction in which the core metal 21 does not ride on the upper end (inside of the tube body) of the wrap portion 9 and does not hit the wrap portion 9. Along the upper end of the wrap portion 9 (the end of the water expansion sheet 5 that wraps inside the tube) toward the lower end (the end of the water expansion sheet 5 that wraps outside the tube). Direction.

FIG. 10 is a diagram showing the relationship between the wrapping direction of the wrap portion 9 and the rotational direction of the spiral grooved tube 3. FIG. 10 (a) is a front view of the spiral grooved tube 3, and FIG. FIG. 3 is an enlarged view of a wrap portion 9. In a state where the cored bar 21 presses the lap portion 9, the spiral grooved tube 3 rotates in the arrow Z direction in the figure. The wrap portion 9 wraps so that the inner sheet end portion 37 is on the upper side and the outer sheet end portion 39 is on the lower side, and a step 38 is formed by the inner sheet end portion 37. That is, the inner sheet end 37 is a sheet end on the side exposed to the cored bar 21 side. The rotation direction in which the water expansion sheet 5 is not turned is a direction in which the core metal 21 does not run over the step formed by the inner sheet end portion 37 of the wrap portion 9. The direction in which the core metal 21 does not run over the step formed by the inner sheet end portion 37 of the wrap portion 9 is the rotational direction in which the spiral grooved tube 3 moves in the direction of arrow Z in the figure. That is, the cored bar 21 starts pressing the water expansion sheet 5 from the inner sheet end portion 37 of the water expansion sheet 5 and descends the step 38 to press the outer sheet end portion 39. For this reason, the cored bar 21 does not ride on the step 38 and does not hit the step 38. In addition, what is necessary is just to make it into the rotation direction opposite to the said Z direction with respect to the rotation direction which the water expansion sheet 5 in the case of rotating the core metal 21 while fixing the pipe | tube 3 with a spiral groove.

The rotating roller 11 is rotated by a preset number of rotations by a timer or an encoder (not shown). The number of rotation settings needs to be at least the number of rotations of the spiral grooved tube 3 for one rotation. This is because the cored bar 21 presses the inner circumferential surface of the spiral grooved tube 3 over the entire circumference. The actual number of rotations may be appropriately determined in consideration of the adhesiveness and pressure-bonding property of the adhesive.

FIG. 11 is a cross-sectional view showing a state where the spiral grooved tube 3 is rotated once in a state where the cored bar 21 presses the water expansion sheet 5. Due to the rotation of the spiral grooved tube 3, the water expansion sheet 5 on the inner peripheral surface is pressed along the spiral groove 7 on the inner peripheral surface over the entire periphery. Further, the cored bar 21 and the spiral grooved tube 3 are screwed together. For this reason, when the spiral grooved tube 3 rotates, the cored bar 21 moves by one pitch of the groove 7 from the initial pressing position relative to the spiral grooved tube 3. FIG. 11 shows a state in which the core metal 21 has moved in the direction of retreating backward (in the direction of arrow F in the figure).

When the rotating roller 11 finishes rotating at the set number of rotations, the control unit stops the motor 13 and operates the mandrel pressing cylinder 23 to bring the mandrel 21 to its original height as shown in FIG. The pressure is raised (in the direction of arrow D in the figure), and the pressing by the cored bar 21 is finished (steps 109 and 110).

When the control unit detects that the mandrel pressing cylinder 23 has returned to the original position (the uppermost part) by a limit switch or the like (not shown), the mandrel sliding cylinder 29 and the tube pressing cylinder 17 are respectively operated. Return to the original position. Accordingly, the cored bar 27 returns to the original position (in the direction of arrow F in the figure), the pressing roller 15 rises (in the direction of arrow B in the figure), and releases the pressing of the spiral grooved tube 3. In this way, the pipe joint 1 in which the water expansion sheet 5 is pasted on the inner peripheral surface of the spiral grooved pipe 3 is manufactured.

The manufacture of the pipe joint 1 is completed by detecting that the core metal sliding cylinder 29 and the tube body pressing cylinder 17 are in their original positions by a limit switch or the like (not shown). After the pipe joint 1 that has been manufactured is removed, the spiral grooved pipe 3 is newly set as necessary, and the same operation is repeated to manufacture the pipe joint 1. The above operation is controlled by the control unit. As the control unit, a limit switch, a photoelectric sensor, a pressure sensor, a timer, a temperature sensor, and the like may be configured by relay control, and a CPU is used as the control unit. Control may be performed by operating a program. Further, in the manufacture of these pipe joints 1, the setting and pressing of the tube body to the manufacturing apparatus, the insertion of the core metal into the tube body, the pressing of the sheet member by the core metal, the operation of the motor for rotating the tube body, etc. Although it can be performed automatically, it can also be performed manually while checking each operation.

Thus, according to the pipe joint manufacturing apparatus 10 concerning this Embodiment, the pipe joint 1 which has the water expansion sheet 5 in an internal peripheral surface can be manufactured easily. Even if the pipe joint 1 has the spiral groove 7 on the inner peripheral surface, the water expansion sheet 5 can be attached along the groove 7. Further, if at least a part of the water expansion sheet 5 is temporarily fixed to the inner peripheral surface of the spiral grooved tube 3, the water expansion sheet 5 does not move in the spiral grooved tube 3. Can be done.

The cored bar 21 that presses the water expansion sheet 5 can adjust the pressing force, and can always be pressed with a constant pressure. For this reason, a stable quality can always be obtained without being influenced by the dimensional accuracy of the spiral grooved tube 3. In addition, even when pressing the wrap portion of the water expansion sheet 5 to a predetermined thickness, even when attaching a water expansion sheet with a different thickness, it is not necessary to replace the core metal 21, Depending on the type and thickness of the water expansion sheet, it is possible to perform the affixing operation with an appropriate pressing force, reducing the mandrel replacement work and eliminating the need to arrange a large number of mandrel. Good.

The cored bar 21 that presses the water expansion sheet 5 can be heated to adjust the temperature. For this reason, when the metal core 21 presses the water expansion sheet 5, it becomes easy to form the water expansion sheet 5 into the uneven shape formed by the grooves 7 on the inner peripheral surface of the spiral grooved tube 3, When the expansion sheet 5 contains a thermoplastic resin, the water expansion sheet 5 can be reliably molded, so that a high quality pipe joint 1 can be obtained. In addition, it is desirable that the water expansion sheet 5 and the spiral grooved tube 3 be bonded by heating, but if heated, the bonding can be performed easily and reliably. Furthermore, since a hot melt adhesive can be used, the bonding time can be shortened.

Further, the core metal 21 presses only a part of the inner peripheral surface of the pipe joint of the water expansion sheet 5, and when pressing the water expansion sheet 5, no force is applied in the axial direction of the spiral grooved tube 3, and the core metal 21 Since the rotation direction of the spiral grooved tube 3 when pressing the water expansion sheet 5 is a direction in which the water expansion sheet 5 is not turned over, the water expansion sheet 5 is pressed when the water expansion sheet 5 is pressed by the metal core 21. No peeling or turning, and no defects occur.

Furthermore, in order to attach the water expansion sheet 5 to the entire inner peripheral surface of the spiral grooved tube 3, the spiral grooved tube 3 may be rotated at least once. For this reason, since the bonding time of the water expansion sheet 5 to the spiral grooved tube 3 is extremely short, the pipe joint 1 can be produced with high productivity.

Moreover, even when it has an independent groove | channel in the internal peripheral surface of the spiral grooved pipe 3, the water expansion sheet 5 can be reliably affixed along the independent groove | channel of the spiral grooved pipe 3 internal peripheral surface.

FIG. 13 is a view showing an independent grooved tube 43 having an independent groove 41. FIG. 13 (a) is a perspective view of the independent grooved tube 43, and FIG. It is sectional drawing which shows the state which is pressing. The pipe joint 40 is obtained by attaching the sheet member 5 to the inner peripheral surface of an independent grooved pipe 43 having an independent groove 41. Here, the independent groove 41 refers to a plurality of annular grooves provided independently from each other in the tube axis direction.

According to the pipe joint manufacturing apparatus 10, the pipe joint 40 can be manufactured using the cored bar 21 having the convex portion 22 corresponding to the independent groove 41, even if the pipe 43 has the independent groove 41. it can. That is, as shown in FIG. 13 (b), the cored bar 21 having the convex portion 22 corresponding to the independent groove 41 presses the water expansion sheet 5 to the inner peripheral surface of the independent grooved tube 43, and is independent in this state. When the grooved tube 43 is rotated, the water expansion sheet 5 can be attached along the independent groove 41 over the entire inner peripheral surface of the independent grooved tube 43.

Therefore, if only the shape of the cored bar 21 is changed, even the pipe joint 40 having the independent groove 41 is the pipe joint 1 having the spiral groove 7 or another pipe joint having no groove. Can be produced in the same manner. When manufacturing the pipe joint 40 having the independent groove 41, even if the independent grooved tube 43 rotates when the water expansion sheet 5 is pressed by the core metal 21, the core metal 21 is not screwed with the spiral groove. Does not move in the axial direction of the pipe joint.

As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

For example, in the first embodiment, since the core metal 21 longer than the spiral grooved tube 3 is used, the core metal 21 is arranged on the inner periphery of the spiral grooved tube 3 while the spiral grooved tube 3 rotates once. Although the surface could be pressed over the entire length, a metal core 21 shorter than the spiral grooved tube 3 may be used. That is, in the first embodiment, the cored bar 21 is inserted into the spirally grooved pipe 3 until the cored bar 21 overlaps with the entire length of the spirally grooved pipe 3, and then the water expansion sheet 5 is pressed. It is also possible to perform a pressing operation after inserting the metal core 21 shorter than the spiral grooved tube 3 into the spiral grooved tube 3.

For example, after inserting a core metal 21 shorter than the spiral grooved tube 3 into the groove 7 on the inner circumferential surface of the spiral grooved tube 3, the water expansion sheet 5 is pressed by the cored bar 21, and then the spiral grooved tube 3 is rotated. Thus, the cored bar 21 and the spiral grooved tube 3 are screwed together, and the cored bar 21 presses the water expansion sheet 5 over the entire length of the spirally grooved tube 3 while moving in the spiral grooved tube 3 by screwing. Can do. In this case, the total length of the cored bar 21 can be made shorter than the spiral grooved tube 3, but the total length of the cored bar 21 is preferably longer than the total length of the water expansion sheet 5.

In the embodiment described above, the spiral grooved tube 3 is rotated. However, the core metal 21 may be rotated, or both may be rotated. That is, if the spiral grooved tube 3 and the cored bar 21 rotate relatively, the same effect can be obtained.

Further, the spiral grooved tube 3 has a protrusion 4 and is aligned with the groove 4 of the rotating roller 11 so that the set position of the spiral grooved tube 3 is aligned, and when the water expansion sheet 5 is attached, the spiral grooved tube 3 3 is prevented from moving in the direction of the axis 14 of the rotating roller 11, but the spiral grooved tube 3 is set on the rotating roller 11 as shown in FIG. The same effect can be obtained by providing the protrusion 6 or the step 8 for alignment and prevention of the axial displacement of the spiral grooved tube 3.

14A is a diagram showing a state in which the protrusion 6 is provided on the rotating roller 11. If the annular groove 42 is provided on the outer surface like the independent grooved tube 43, FIG. By aligning the groove 42 and the groove 42, the set position of the independent grooved tube 43 can be made constant. In addition, when the water expansion sheet 5 is attached, the independent grooved tube 43 does not shift in the direction of the shaft 14 on the rotating roller 11.

FIG. 14B is a view showing a state in which the rotating roller 11 is provided with a step 8. By providing a step 8 having a width corresponding to the length of the spiral grooved tube 3, the spiral grooved tube is provided. 3 fits into the step 8, so that the set position of the spiral grooved tube 3 can be kept constant. Further, the spiral grooved tube 3 does not shift in the direction of the shaft 14 on the rotating roller 11 when the water expansion sheet 5 is attached. The grooves 4, the protrusions 6, and the steps 8 can be provided not only on the rotating roller 11 but also on the pressing roller 15, and can be provided only on the pressing roller 15 instead of the rotating roller 11.

In addition, although the manufacturing method and manufacturing apparatus of this invention are normally applied about the manufacturing method and manufacturing apparatus of a joint in any form of a joint of an independent grooved pipe, a spiral grooved pipe, and a linear pipe body. In addition to the above-mentioned joints, the present invention can also be applied to the manufacture of dissimilar pipe joints (joints for dissimilar pipe bodies) in which different types of pipes are connected to both ends of the joints.

In addition, the pipe is manufactured from only one side of the pipe joint using the method described in the present invention. In the case of a different type pipe joint, the sheet member is divided into two pieces from the end of the joint toward the joint center. In the case of pasting, by selecting the length of the pressing member, two sheets can be pasted at the same time, or by reversing the joint in the tube axis direction, the two parts can be pasted one by one. it can.

It is a figure which shows the pipe joint manufacturing apparatus 10, (a) is a figure which shows the structure of the pipe joint manufacturing apparatus 10, (b) is a H direction arrow directional view of the rotation roller 11 and the pressing roller 15. It is a figure which shows the state which installed the water expansion sheet | seat 5 in the spiral grooved tube 3, (a) is a perspective view of the spiral grooved tube 3, (b) is sectional drawing of the spiral grooved tube 3, (c) is a spiral The figure which looked at the grooved pipe 3 from the axial direction. The flowchart which shows operation | movement of the pipe joint manufacturing apparatus 10. FIG. The figure which shows the state which set the pipe 3 with a spiral groove in the pipe joint manufacturing apparatus 10. FIG. The figure which shows the state which the pressing roller 15 of the pipe joint manufacturing apparatus 10 pressed down the pipe 3 with a spiral groove. The figure which shows the state by which the metal core 21 of the pipe joint manufacturing apparatus 10 was inserted in the pipe 3 with a spiral groove. The figure which shows the state which the metal core 21 of the pipe joint manufacturing apparatus 10 pressed the water expansion sheet 5 in the pipe 3 with a spiral groove. It is sectional drawing which shows the state which the metal core 21 presses the water expansion sheet 5, (a) is a figure which shows the state in which the metal core 21 was inserted in the pipe 3 with a spiral groove, (b) The figure which shows the state which pressed the water expansion sheet 5 to the pipe 3 with a spiral groove. The figure which shows the state which the rotation roller 11 of the pipe joint manufacturing apparatus 10 rotated. It is a figure which shows the state which rotated the spiral grooved tube 3 in the state which pressed the water expansion sheet 5 with the metal core 21, (a) is a front view of the spiral grooved tube 3, (b) is expansion of the lap | wrap part 9. Figure. Sectional drawing which shows the state which the pipe 3 with a spiral groove rotated in the state which the metal core 21 pressed the water expansion sheet 5 to the pipe 3 with a spiral groove. The figure which shows the state which manufacture of the pipe joint 1 of the pipe joint manufacturing apparatus 10 was completed. It is a figure which shows the independent grooved pipe | tube 43 which has an independent groove, (a) is a perspective view of the independent grooved pipe | tube 43, (b) is sectional drawing which shows the state which the metal core 21 is pressing the independent grooved pipe | tube 43 . FIG. 6 is a diagram showing a state of alignment between the rotating roller 11 and the independent grooved tube 43 or the spiral grooved tube 3, (a) is a diagram showing a state in which a protrusion 6 is provided on the rotating roller 11, and (b) is a rotating roller. 11 is a diagram illustrating a state in which a step 8 is provided in 11. It is a figure which shows the conventional pipe joint 50, (a) is a perspective view which shows the external appearance of the pipe joint 50, (b) is sectional drawing of the pipe joint 50. FIG. Sectional drawing which shows the state which the pipe joint 50 connected protective piping 51a, 51b.

Explanation of symbols

1, 40 ... Pipe fitting 3 ... Spiral grooved tube 4 ... Projection part 5 ... Water expansion sheet 6 ... Projection 7 ... Groove 8 ... Step 9 ... ... Wrap part DESCRIPTION OF SYMBOLS 10 ... Pipe manufacturing apparatus 11 ... Rotary roller 12 ... Groove 13 ... Motor 14 ... Shaft 15 ... Pressing roller 16 ... Shaft 17 ... Tube body pressing cylinder 18 ......... Supporting portion 19 ...... Tube holding rod 20 ......... Supporting portion 21 ......... Core metal 22 ......... Convex portion 23 ......... Core metal pressing cylinder 25 ......... Core metal pressing rod 26 ......... Core metal arm 27 ......... Core metal mount 29 ......... Core metal sliding cylinder 30 ......... Base 31 ......... Core metal sliding rod 33 ......... Guide rail 35 ......... Stopper 37 ......... inner sheet member 38 ......... step 39 ......... outer sheet member 41 ......... independent groove 42 ......... groove 43 ......... Tatsumizo with tube 50 ......... fitting 51 ......... protective pipe 52 ......... butt portion 53 ......... spiral grooved tube 54 ......... spiral groove 55 ......... water swelling sheet

Claims (14)

For a grooved tube having a spiral groove formed continuously in the tube or a plurality of annular grooves formed independently of the tube,
In the inside of the grooved tube body in which the sheet member is arranged along the inner peripheral surface of the grooved tube body,
After inserting a pressing body having convex portions in the tube axis direction according to the groove shape of the grooved tube body on the surface of the grooved tube body fitted through the grooved tube body and the sheet member,
Bringing the pressing body into contact with the sheet member;
Further, while pressing the pressing body against the sheet member against the peripheral surface of the tubular body, rotating the tubular body,
A pipe joint manufacturing method for manufacturing a pipe joint by bonding or crimping a sheet member disposed on an inner peripheral surface of a grooved pipe body.   When the sheet member is disposed along the inner peripheral surface of the grooved tubular body, the sheet member is temporarily fixed to at least one place on the inner peripheral surface of the tubular body, and the sheet member is 2. The method for manufacturing a pipe joint according to claim 1, wherein the pipe joint is disposed so as not to move with respect to the inner peripheral surface.   The method for manufacturing a pipe joint according to claim 1 or 2, wherein, instead of rotating the grooved tube body, the pressing body is rotated, or both the grooved tube body and the pressing body are rotated. .   The pipe joint according to any one of claims 1 to 3, wherein the pressing body is either equal to or longer than an axial length of the sheet member attached to the pipe body. Production method.   In the manufacturing method of the pipe joint according to any one of claims 1 to 4, a straight pipe body is used instead of the grooved pipe body, and a pressing portion having a convex portion in a pipe axis direction to be fitted thereto. A method of manufacturing a linear pipe joint, wherein a pressing body having a linear portion in the tube axis direction is used instead of the body.   The method for manufacturing a pipe joint according to any one of claims 1 to 5, wherein the sheet member disposed on the inner peripheral surface of the grooved tube body is bonded or crimped by heating. For a grooved tube having a spiral groove formed continuously in the tube or a plurality of annular grooves formed independently of the tube,
In the inside of the grooved tube body in which the sheet member is arranged along the inner peripheral surface of the grooved tube body,
After inserting a pressing body having convex portions in the tube axis direction according to the groove shape of the grooved tube body on the surface of the grooved tube body fitted through the grooved tube body and the sheet member,
Bringing the pressing body into contact with the sheet member;
Further, by pressing the lap portion of the sheet member against the inner peripheral surface of the tubular body by the pressing body, and bonding or crimping the wrap portion to the peripheral surface of the tubular body, and after reducing the sheet member thickness of the wrap portion,
While pressing the pressing body against the peripheral surface of the tubular body against the sheet member, rotating the tubular body,
A pipe joint manufacturing method for manufacturing a pipe joint by bonding or crimping a sheet member disposed on an inner peripheral surface of a grooved pipe body.   When the sheet member is disposed along the inner peripheral surface of the grooved tubular body, the sheet member is temporarily fixed to at least one place on the inner peripheral surface of the tubular body, and the sheet member is The pipe joint manufacturing method according to claim 7, wherein the pipe joint is disposed so as not to move with respect to the inner peripheral surface.   The method for manufacturing a pipe joint according to claim 8, wherein the lap portion of the sheet member is temporarily fixed to an inner peripheral surface of the pipe body. While rotating the tubular body while pressing the pressing body against the sheet member against the circumferential surface of the tubular body,
The method for manufacturing a pipe joint according to any one of claims 7 to 9, wherein the pressing body is in a direction not to run over a step formed by an inner end portion of the wrap portion. A pressing body for pressing the inner peripheral surface of the tubular body;
Moving means for moving the pressing body into and out of the tubular body;
A pressing means for pressing the pressing body against the inner peripheral surface of the tubular body;
A rotating means for rotating the tubular body and / or the pressing body;
Comprising
The moving means moves the pressing body to the inside of the tubular body, and presses the pressing body against the inner peripheral surface of the tubular body by the pressing means, and the rotating body and the tubular body and / or the pressing body. An apparatus for manufacturing a pipe joint that can be applied to any of an independent grooved tube, a spiral grooved tube, and a straight tube. The tubular body has a groove on the inner peripheral surface,
The said press body has a convex part according to the shape of the said groove | channel, The manufacturing apparatus of the pipe joint of Claim 11 characterized by the above-mentioned. It said pressing means, the pipe joint of the manufacturing apparatus according to any one of claims 11 or claim 12, characterized in that it is possible to adjust the pressing force to the tube body circumferential surface of the pressing body. Said moving means, said applying a force to the pressing body when moving the pressing member in the pipe body is rotated, the pressing member from claim 11, characterized in that it is subjected to a force from said moving means The pipe joint manufacturing apparatus according to claim 13 .

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