JP2006258204A - Method for manufacturing tube joint, and manufacturing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a tube joint by applying a water-expansion sheet 15 on an inner surface of a main body member 12, in which a tube joint having uniform quality can be easily manufactured. <P>SOLUTION: In this method for manufacturing a tube joint, on an inner circumferential surface of a main body member 12 in a cylindrical form that is preliminarily formed, the water-expansion sheet 15 that absorbs water to expand is disposed, and a core member 24 is fitted into the main body 12, while rotating. The water-expansion sheet 15 is fixed to the main body member 12 by an adhesive component 15a provided on the inner circumferential surface of the main body member 12, on an outer surface of the water-expansion sheet 15, or in the vicinity of them. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pipe joint for connecting a pipe body used when, for example, an electric wire or cable is buried in the ground, and more particularly to a pipe joint that can be easily connected by simply inserting the pipe body. .

  Some pipe joints as described above have a water expansion layer that expands by absorbing moisture on the inner peripheral surface of a synthetic resin body member.

  And about the formation aspect of the water expansion layer, when forming a main body member, the water expansion layer is integrally formed on the inner surface of the main body member, and water for forming the water expansion layer on a previously formed main body member. There is one that affixes an expansion sheet (see Patent Document 1 below).

  The former pipe joint has advantages such as uniform quality and easy manufacturing operations.

  However, in the latter pipe joint, since the water expansion sheet is manually attached, the quality of the product tends to vary. Moreover, if the pipe joint has spiral irregularities so as to connect spiral pipes (tubular bodies) having spiral irregularities, the pasting operation is difficult. That is, even if it is attempted to apply the water expansion sheet evenly to all the portions (peak portions and valley portions) of the spiral unevenness in the main body member, unevenness may occur and a gap may be formed.

JP 2003-278773 A

  Accordingly, the main object of the present invention is to enable easy manufacture of a pipe joint having uniform quality.

  For that purpose, after placing a water expansion sheet that expands by absorbing moisture on the inner peripheral surface of a cylindrical body member formed in advance, the core member is pressed into the body member while rotating, A pipe joint manufacturing method for fixing the water expansion sheet to the main body member with an adhesive component provided on the inner peripheral surface of the main body member, the outer surface of the water expansion sheet, or in the vicinity thereof.

  That is, the water expansion sheet disposed on the inner peripheral surface of the cylindrical main body member is pressed toward the inner peripheral surface of the main body member by the core material that enters while rotating. The water expansion sheet is bonded and fixed to the main body member with an adhesive component provided on the inner peripheral surface of the main body member, the outer surface of the water expansion sheet, or the vicinity thereof while receiving a pressing action. As a result, a pipe joint having a water expansion layer made of a water expansion sheet is obtained.

  Since the water expansion sheet can be pressed as desired according to the shape of the core member with respect to the main body member, a homogeneous product can be obtained. Moreover, since the core mold material is press-fitted while rotating, the press-fitting can be performed smoothly and the operation is simple.

  In addition, as said adhesive component, the appropriate thing corresponding to the adhesion | attachment method can be selected from various adhesive agents, synthetic resins, etc. The adhesive component is provided by appropriate means such as coating, impregnation, coating, and inclusion.

  Moreover, when arrange | positioning the said water expansion sheet in a main body member, it is good to stop a part of water expansion sheet to some parts of a main body member by appropriate means, such as an adhesive agent and a double-sided adhesive tape. When a hot-melt adhesive is provided in the water expansion sheet or the main body member as the adhesive component, it can be easily stopped by applying heat and pressure.

Here, the invention of this manufacturing method can obtain the following aspects.
One of them is a method for manufacturing a pipe joint in which the core material is press-fitted by heating the core material, and the adhesive component is a hot melt adhesive.

  That is, the hot melt adhesive is applied to the outer surface of the water expansion sheet before being placed in the main body member, and the hot melt adhesive is melted by the press-fitting of the heated core material and receives the pressure to receive the main body member. Can be adhered to. Since a hot melt adhesive is used, no harmful gas is generated, the working environment is good, and the time required for bonding is only a few seconds, and the manufacturing operation is smooth.

  In another aspect, the protrusion formed at the tip of the core material performs preliminary shaping to spread the water expansion sheet outward prior to pressing the water expansion sheet by press-fitting the core material. A method for manufacturing a pipe joint.

  That is, before the core material press-fits and presses the water expansion sheet, the protruding portion hits the water expansion sheet arranged in the main body member. Then, the water expansion sheet is spread outward and the shape is adjusted so as to be easily pressed. As a result, the load applied to the water expansion sheet is reduced, and press-fitting is facilitated.

  Another means is a holding means for holding a pre-formed cylindrical main body member, and a pre-arranged in the main body member when it moves in and out of the main body member and press-fits into the main body member. Manufacture of a pipe joint having a core member that presses the water expansion sheet toward the inner peripheral surface of the main body member, a rotating member that rotates the core member and / or the holding member, and a moving member that performs the entering / exiting operation. Device.

  That is, in this manufacturing apparatus, after the main body member is held by the holding means, the core member is moved by the moving means so that the core member moves in and out of the main body member, and the core member and / or the holding member is rotated to rotate the main body member. Press the core material into the inside. By this press-fitting, the water expansion sheet previously installed in the main body member is pressed and fixed toward the inner peripheral surface of the main body member.

  Since the water expansion sheet is pressed and fixed by press-fitting the core material, a homogeneous product can be obtained depending on the shape of the core material. Moreover, since it is automatically performed by the holding means, the moving means, and the rotating means, it is simple.

  Note that the rotating means may rotate the core material, rotate the holding means, or rotate both of them. Further, the rotation is preferably forward and reverse.

  Similarly, the moving means may move while supporting the core material, move the holding means, or move both of them.

Here, the invention of this manufacturing apparatus can obtain the following aspects.
One of them is an apparatus for manufacturing a pipe joint, in which the core material or its vicinity has a heater for heating the core material.

  That is, since the core mold material is heated by the heater, the water expansion sheet can be formed depending on its properties, and if the material (adhesive component) for adhering the water expansion sheet is bonded by heat, the bonding is also possible. Yes.

  In another aspect of the present invention, the core-shaped material has a protruding portion that has a diameter smaller than the inner diameter of the main body member at the tip, and spreads the water-expandable sheet outward prior to pressing the water-expandable sheet by press-fitting the core-shaped material. And a pipe joint manufacturing apparatus.

  That is, before the core material press-fits and presses the water expansion sheet, the protruding portion hits the water expansion sheet arranged in the main body member. Then, the water expansion sheet is spread outward and the shape is adjusted so as to be easily pressed. As a result, the load applied to the water expansion sheet is reduced, and press-fitting is facilitated.

  As described above, according to the present invention, the core member is press-fitted into the main body member in which the water expansion sheet is disposed, and the water expansion sheet is pressed to be fixed to the main body member. No homogeneous product can be easily obtained.

  Especially when the main body member has spiral irregularities for connecting the spiral tube, and the core-shaped material has a shape corresponding thereto, also for the mountain portion of the main body member, Even in the valley portion, it can be fixed evenly without gaps, and a highly accurate product that was impossible by hand can be obtained.

An embodiment for carrying out the present invention will be described below with reference to the drawings.
First, the pipe joint 11 will be described.
FIG. 1 is a perspective view of a pipe joint 11 and FIG. 2 is a cross-sectional view thereof. As shown in these drawings, the pipe joint 11 has a cylindrical shape having spiral irregularities on both the inside and outside surfaces, and is made of a synthetic resin. The water expansion layers 13 and 13 which absorb and absorb water are provided on both left and right side portions of the inner peripheral surface of the main body member 12. In addition, the code | symbol of 12b is attached | subjected to the peak part of the spiral unevenness | corrugation in the inner surface of the main body member 12, and 12b.

  As shown in FIG. 3, the spiral irregularities are connected to prevent the tube body 14 (so-called spiral tube or corrugated tube) having the spiral irregularities (14a, 14b) from rotating while being rotated. It is formed over the entire length of the pipe joint 11.

  The illustrated pipe joint 11 is an example of various types, and may be a pipe joint of another shape such as a different kind of pipe joint.

  Thus, the pipe joint 11 having the water expansion layers 13 and 13 on the inner peripheral surface of the main body member 12 simply connects the pipe body 14 and buryes it in the ground, and as shown in FIG. , 13 absorbs moisture in the ground and expands to obtain water-stopping properties at the joints.

  As described above, the highly convenient pipe joint 11 is manufactured by attaching the water expansion sheet 15 to the inner peripheral surface of the main body member 12 formed in advance.

  In addition, the said water expansion sheet 15 is a sheet-like thing which hold | maintained at least high water absorption resin in the nonwoven fabric. As the non-woven fabric, for example, those made of appropriate fibers such as polyethylene terephthalate (PET) are used, and as the superabsorbent resin, for example, fibrous, powdery, sheet-like, etc. Is used. Selection and mixing of these materials are appropriately performed so as to obtain desired properties.

  Moreover, it is preferable that the water expansion sheet 15 contains a thermoplastic resin in addition to the superabsorbent resin. This is because the form of the water expansion layer 13 of the pipe joint 11 obtained by the manufacturing method / apparatus described below hardly changes even if time elapses after manufacturing.

Next, the pipe joint manufacturing apparatus 21 will be described.
FIG. 4 shows a pipe joint manufacturing apparatus 21, and thus the pipe joint manufacturing apparatus 21 includes a fixed base 22, a holding means 23 that is installed on the fixed base 22 and holds the main body member 12, and the holding A core member 24 press-fitted into the main body member 12 held by the means 23, a motor 25 as a rotating means for rotating the core member 24, and a movement for reciprocating the core member 24 together with the motor 25 on the fixed base 22 Means 26.

  The holding means 23 is fixed on the fixed base 22 and receives a cylindrical body member 12, and a presser 32 that moves up and down relative to the base 31 and holds the body member 12 in a non-rotatable manner. And have. The presser 32 is configured to be moved up and down by a fixing hydraulic cylinder 34 from a support portion 33 supported above the fixed base 22. Opposing surfaces of the cradle 31 and the presser 32 are formed by arcuate curved surfaces 31 a and 32 a having a size capable of sandwiching the main body member 12. The surfaces of the curved surfaces 31a and 32a may be provided with a non-slip member such as a rubber sheet as necessary.

  When the core member 24 is press-fitted into the main body member 12, as shown in FIG. 5, the water expansion sheet 15 arranged in advance inside the main body member 12 is directed toward the inner peripheral surface of the main body member 12. The crest portion 12a and the trough portion 12b are pressed evenly. Therefore, the core member 24 has an outer diameter D2 that is slightly smaller than the inner diameter D1 of the main body member 12 (the inner diameter of the valley portion 12b is shown in the figure). It is formed in a size and shape that can form a uniform clearance with the inner peripheral surface of the member 12. In the figure, 24a is a spiral peak portion, and 24b is a spiral valley portion.

  The clearance is appropriately set depending on conditions such as the thickness of the water expansion sheet 15 and the hardness of the main body member 12. Specifically, for example, it may be about 0.5 mm to several mm.

  Further, the distal end portion of the core member 24 has an outer diameter D4 smaller than the inner diameter D3 of the crest portion of the main body member 12, and performs a positioning action prior to the pressing of the water expansion sheet 15 by press-fitting of the core member 24. At the same time, a protrusion 24c having a circular shape when viewed from the front is formed to spread the water expansion sheet 15 outward.

  The thickness may be a thickness less than the width of one spiral crest portion 24a in the core member 24, for example, a thickness of about several mm.

  The core member 24 having such a shape is made of metal and has a built-in heater 41. The core material 24 is heated to a predetermined temperature by the heater 41.

  Here, the arrangement of the water expansion sheet 15 with respect to the main body member 12 performed in advance as described above will be described with reference to FIGS.

  When the water expansion sheet 15 is rolled to a size that can be accommodated in the main body member 12, as shown in FIG. And the hot-melt-adhesive 15a is apply | coated to the upper surface (surface located outside when it rounds). The application is performed using a gun. At this time, a large number of linear hot melt adhesives 15 a are arranged along the length direction of the main body member 12.

  The water-expandable sheet 15 to which the hot melt adhesive 15a is applied is rolled into a cylinder having a size that can enter the main body member 12, and a double-sided adhesive tape, an adhesive, or the like (not shown) applied to the superposed portion. ) To maintain the cylindrical shape. In this state, as shown in FIG. 7A, the main body member 12 is housed in a predetermined position, and as shown in FIG. Is adhered to. Adhesion is appropriately performed using an adhesive, rubber glue, double-sided adhesive tape, or the like.

  The water expansion sheet 15 is bonded to the main body member 12 when the hot-melt adhesive 15a is applied to the upper surface of the water expansion sheet 15 as described above, and the water expansion sheet 15 is disposed at a predetermined position of the main body member 12. After that, for example, as shown in FIG. 8, it is also possible to press the heated pressing body 42 having a substantially hemispherical surface. Since the heated pressing body 42 has a substantially hemispherical surface, the pressed body 42 is sandwiched between the water expansion sheet 15 and the main body member 12 in order to satisfactorily abut against the end surface of the main body member 12 having spiral irregularities. The hot-melt adhesive 15a is melted to perform bonding. This bonding operation can be performed manually, as well as by connecting a heater to the pressing body 42 and configuring the pressing body 42 so as to be relatively close to and away from the held main body member 12. Can also be done.

In the pipe joint 11 according to this embodiment, the water expansion sheet 15 is attached to both side portions of the inner peripheral surface of the main body member 12 as described above, and the pipe joint manufacturing apparatus 21 simultaneously applies the attachment. Since it is going to perform, the said core-shaped material 24 and the following structures relevant to this are arrange | positioned by a pair on the right and left.
The motor 25 is composed of an appropriate motor that rotates forward and reverse, and the number of rotations is controlled.

  The moving means 26 includes a rail 51 provided on the fixed base 22, a slider 52 that slides on the rail 51, and a moving hydraulic cylinder 53 that acts to move the slider 52. The slider 52 supports the core 25 in a rotatable manner and supports the motor 25. The moving hydraulic cylinder 53 moves from the initial position (solid line position in FIG. 4) away from the main body member 12 held by the holding means 23 to the press-fit completion position where the core material 24 is press-fitted to a predetermined depth. The slider 52 is reciprocated, and its moving speed and force are appropriately controlled. For example, the moving speed from the initial position of the moving hydraulic cylinder 53 to the press-fitting completion position is set to synchronize with the moving speed when the motor 25 rotates to press-fit the core material 24 into the main body member 12.

  FIG. 9 is a control circuit block diagram for driving and controlling the respective parts of the pipe joint manufacturing apparatus 21 described above. The control unit 61 includes a CPU, a ROM, and a RAM (not shown), and the CPU is a program stored in the ROM. The control operation is executed along with the RAM, and the RAM stores necessary control data.

  The input unit 62 is for setting the drive control conditions of each unit with respect to the control unit 61, and is configured by, for example, a keyboard or mouse of a personal computer or an appropriate input panel.

  The first position detection sensor 63 is provided at an appropriate position on the fixed base 22 and detects that the tip position of the core member 24 is located at a position facing the main body member 12 (virtual line position in FIG. 4). The position of the core member 24 reciprocating by the moving means 26 is detected by the first position detection sensor 63, so that the motor is turned ON / OFF.

  The second position detection sensor 64 is provided at or near the cradle 31 of the holding means 23, and whether or not the main body member 12 is correctly positioned at a correct position in the middle of each core member 24 facing left and right. Is detected.

  The first position detection sensor 63 and the second position detection sensor 64 are configured by known proximity switches, solid-state image sensors, photoelectric sensors, and the like.

  The timer 65 measures the time after the core member 24 is press-fitted into the main body member 12 and the motor 25 is stopped.

  A control operation performed by the control unit 61 of the pipe joint manufacturing apparatus 21 configured as described above will be described with reference to the flowchart of FIG.

  First, the main body member 12 on which the water expansion sheet 15 is arranged is set on the cradle 31 of the holding means 23.

  When the second position detection sensor 64 detects this set state and determines that the main body member 12 is in the correct position (step n11), the fixing hydraulic cylinder 34 is driven (step n12), and the main body member 12 is held unrotatable.

  Subsequently, the moving hydraulic cylinder 53 is driven, and the core member 24 moves toward the main body member 12 (step n13). The core member 24 is heated by the heater 41 at a predetermined temperature.

  When the first position detection sensor 63 detects whether the core member 24 is located at the position facing the main body member 12, that is, at the rotation start position (step n14), the motor 25 is driven (forward rotation) (step n15). ) And the rotation speed is counted.

  As shown in FIG. 11, the core material 24 penetrates while the water expansion sheet 15 is preliminarily pushed and spread by the protrusion 24 c at the tip end thereof, as shown in FIG. 11, and the peripheral surface irregularities (mountain portions 24 a , The valley portion 24b) is pressed into a shape along the inner peripheral surface of the main body member. Then, the water expansion sheet 15 is formed into a shape along the inner peripheral surface of the main body member 12 by heat and pressure, and the hot melt adhesive 15a applied to the upper surface of the water expansion sheet 15 is melted to form a water expansion sheet. 15 and the main body member 12 are bonded together.

  When the rotational speed of the motor 25 reaches a preset number (step n16), the motor 25 and the moving hydraulic cylinder 53 are stopped (step n17).

  When the timer 65 measures a predetermined time set in advance (step n18), the motor 25 is rotated in the reverse direction, and the moving hydraulic cylinder 53 is driven (returned). The core member 24 comes out of the main body member 12 by driving the motor 25 and the moving hydraulic cylinder 53.

  Note that the time counting by the timer 65 is appropriately set according to the conditions such as the type of the water expansion sheet 15 and the hot melt adhesive 15a. The return and rotation of the hydraulic cylinder 53 for rotation and movement may be performed.

  As described above, the sticking of the water expansion sheet 15 to the main body member 12 is automatically performed by press-fitting the heated core member 24 while rotating. Since the core member 24 is formed in an integral shape, it can be applied uniformly and a uniform product with no variation can be easily obtained.

  Moreover, even if the main body member 12 has the spiral irregularities (the crest portion 12a and the trough portion 12b), the core member 24 has the crest portion 24a and the trough portion 24b so as to correspond thereto, Since it has a shape having the same clearance, it can be uniformly fixed without any gaps to all portions. For this reason, it is possible to obtain a highly accurate product that was impossible by hand.

  Furthermore, since the core material 24 has a protruding portion 24c at the tip thereof, the core material 24 hits the water expansion sheet 15 before being pressed and presses the water expansion sheet 15, and positioning is performed when the water is pressed. The inflatable sheet 15 can be spread outward and shaped so that it can be easily pressed. As a result, the load applied to the water expansion sheet 15 can be reduced to facilitate press-fitting, and the desired application can be reliably performed.

Next, other embodiments will be briefly described.
In addition, about the site | part same or equivalent to the said structure, the same code | symbol is attached | subjected and the detailed description is abbreviate | omitted.

  FIG. 12 shows a pipe joint manufacturing apparatus 21 configured so as to be able to cope with the diameter of the body member 12 to be processed, and on the pedestal 31 fixed to the fixed base 22 and the slider 52 constituting the moving means 26. In order to make the heights of the core member 24 and the motor 25 adjustable, they are fixed via jacks 71 as an example of lifting means.

  The core member 24 is configured to be detachably attached to the rotating portion 72 that is rotatable by the motor 25 and incorporates the heater 41, and can be appropriately replaced according to the size of the main body member 12. Several sizes are provided.

  FIG. 13 shows another example according to the form of the protruding portion 24c. As shown in (a), the tapered surface 73 is formed at the corner of the protruding portion 24c, but the rounded surface 74 is formed as shown in (b). Alternatively, the shape may be a shape without the projecting portion 24c as shown in (c).

In the correspondence between the configuration of the present invention and the configuration of the above-described embodiment,
The adhesive component of the present invention corresponds to the hot melt adhesive 15a in the above embodiment,
Similarly, the rotating means corresponds to the motor 25,
The present invention is not limited to the above configuration, and various forms can be adopted.

  For example, an apparatus for bonding the main body member 12 and the water expansion sheet 15 performed using the pressing body 42 as shown in FIG. 8 and the pipe joint manufacturing apparatus 21 are provided on the same fixed base 22, The pipe joint 11 may be manufactured continuously.

  Moreover, in the above-mentioned example, the hot melt adhesive 15a that is bonded by applying heat is used as the adhesive component, and this is applied to the upper surface of the water expansion sheet 15, but in addition to this, for example, heat is applied. A normal adhesive that can be bonded at least may be used as an adhesive component. In this case, the adhesive is applied to the inner peripheral surface of the main body member 12 or the upper surface of the water expansion sheet 15 and is attached without being heated or using a heated core material 24.

The perspective view of a pipe joint. Sectional drawing of a pipe joint. Sectional drawing of the action state of a pipe joint. Structure explanatory drawing of a pipe joint manufacturing apparatus. Explanatory drawing of a core type material and a main-body member. Explanatory drawing of a water expansion sheet. Sectional drawing which shows the attachment state with respect to the main body member of a water expansion sheet. Explanatory drawing which shows the adhesion method of a water expansion sheet. The block diagram which shows the structure of a pipe joint manufacturing apparatus. The flowchart which shows the control action of a control part. Sectional drawing which shows an action state. Structure explanatory drawing of the pipe joint manufacturing apparatus concerning other examples. The side view which shows the other example of a core type material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Pipe joint 12 ... Main body member 15 ... Water expansion sheet 15a ... Hot melt adhesive 21 ... Pipe joint manufacturing apparatus 23 ... Holding means 24 ... Core-shaped material 24c ... Projection part 25 ... Motor 26 ... Moving means 41 ... Heater

Claims (6)

After placing a water expansion sheet that expands by absorbing moisture on the inner peripheral surface of a cylindrical body member formed in advance, press the core material into the main body member while rotating, A method of manufacturing a pipe joint for fixing a water expansion sheet to a main body member with an adhesive component provided on a surface, an outer surface of the water expansion sheet, or the vicinity thereof. While the core material is press-fitted by heating the core material,
The method for manufacturing a pipe joint according to claim 1, wherein the adhesive component is a hot melt adhesive. The protrusion part formed in the front-end | tip part of the said core type material performs the preliminary shaping which spreads a water expansion sheet outside prior to the press of the water expansion sheet by press injection of a core type material. Manufacturing method of pipe joint. Holding means for holding a cylindrical body member formed in advance;
A core material that presses the water expansion sheet that is arranged in advance in the main body member toward the inner peripheral surface of the main body member when entering and exiting the main body member and moving forward and press-fitting into the main body member;
Rotating means for rotating the core member and / or the holding means;
An apparatus for manufacturing a pipe joint having a moving means for performing the above-described entry / exit operation. The pipe joint manufacturing apparatus according to claim 4, wherein a heater for heating the core mold material is provided in the core mold material or in the vicinity thereof. The said core type | mold material has a protrusion part which is smaller than the internal diameter of a main body member in the front-end | tip part, and spreads a water expansion sheet outward prior to the press of a water expansion sheet by press injection of a core type material. An apparatus for manufacturing a pipe joint according to claim 1.

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