JP7431707B2 - Resin pipe connection device - Google Patents

Description

The present invention relates to a device for connecting two resin pipes each having a flange at one end.

If it is required to connect resin pipes without performing fusion work at the construction site, a short pipe with a flange can be butt-fused to the resin pipe body at the factory, allowing the flange to be attached to the end. Manufacture resin pipes with The flange portion has an abutting surface perpendicular to the tube axis of the resin tube on the distal end side, and a tapered surface on the opposite side. At the construction site, a connecting device is used to connect the two resin pipes so that the abutting surfaces of the flanges of the pipes butt against each other.

The connection device disclosed in Patent Document 1 includes a pair of upper and lower divided bodies, a hinge means that rotatably connects one end of the pair of divided bodies to each other, and a fastening mechanism that tightens the other ends of the pair of divided bodies to bring them closer together. equipped with the means. Each of the pair of divided bodies has a fitting groove extending semicircularly on the inner periphery. Tapered surfaces having the same taper angle as the tapered surface of the flange portion are formed on both sides of the fitting groove in the tube axis direction.

The process of connecting resin pipes using the connecting device of Patent Document 1 will be briefly described. The pair of divided bodies are opened, and part of the flange portions of the two resin pipes are accommodated in the fitting groove of the lower divided body. Next, the upper divided body is rotated in the closing direction, and part of the flange portions of the two resin pipes are accommodated in the fitting groove of the upper divided body. Finally, the other ends of the pair of divided bodies are tightened by the fastening means so as to bring them closer to each other. As a result, the tightening force is applied in the axial direction to bring the flanges of the two resin tubes closer to each other via the tapered surfaces on both sides of the fitting groove of the pair of split bodies and the tapered surfaces of the flanges of the two resin tubes. converted into power. As a result, the two resin pipes are connected with the abutting surfaces of the flanges abutted against each other.

An annular housing groove is formed in one of the mutually opposing abutting surfaces of the two resin tubes, and a seal ring is fitted into this housing groove. When the pair of divided bodies are tightened by the fastening means, this seal ring comes into close contact with the abutting surfaces of the other, thereby sealing the abutting surfaces of the two resin tubes.

Patent No. 5740123

In the connection device of Patent Document 1, when the connection of the resin pipes is completed by tightening the fastening means with the seal ring removed from the accommodation groove, water leaks from between the abutting surfaces of the resin pipes due to a seal failure. There was no means to easily determine whether the seal was good or not, and therefore whether the resin pipe connection was good or bad.

In order to solve the above problems, the present invention provides a connection device for connecting two resin pipes each having an annular flange portion formed at one end thereof and having an abutting surface and a tapered surface.
first and second divided bodies; hinge means for rotatably connecting one end of the first and second divided bodies to each other along a plane perpendicular to the tube axis of the resin tube; A fastening means for tightening the other ends of the divided body so as to bring them closer together,
The first and second divided bodies each have a fitting groove extending in an arc shape on an inner circumferential surface, and the fitting groove has a tapered surface on both sides thereof, and when tightened by the fastening means, the fitting groove By pressing the tapered surfaces of the flange portions of the two resin tubes, the opposing surfaces of the other end portions of the first and second divided bodies approach each other, and the two resin tubes The abutting surfaces of the flange portions of the flange portions abut each other, and the seal ring accommodated in the annular housing groove of the abutting surface of one resin tube is brought into close contact with the abutting surface of the other resin tube, thereby forming two pipes. The abutting surfaces of the resin pipes are sealed,
Further, it includes a seal determining means for determining whether or not the sealing between the abutting surfaces by the seal ring is good.
The seal discriminating means includes a seal discriminating jig that extends between the first divided body and the second divided body, and a seal discriminating jig that is connected to at least the first, a positioning means for positioning the second divided body in the opposing first direction; and an inspection convex portion formed on the side surface of the other end of the second divided body,
The seal discrimination jig has a first facing surface facing the first divided body at a portion located on the second divided body side, and the inspection convex portion has a second facing surface facing the opposite side of the first divided body. It has a surface,
Only when the two resin pipes are connected with the seal ring normally accommodated in the accommodation groove, the first opposing surface of the positioned seal discriminating jig and the second opposing surface of the second divided body are connected. The distance Da between the opposing surface of the other end is equal to or greater than the distance Dz between the second opposing surface of the inspection protrusion and the opposing surface of the other end of the second divided body, and , the second opposing surface is arranged to face the first direction.

According to the above configuration, it is determined whether the first opposing surface of the seal discriminating jig can face the second opposing surface of the second divided body in the first direction (the opposing direction of the first and second divided bodies). By checking, it is possible to easily determine whether the seal ring is properly accommodated in the accommodation groove and the seal is in good condition, or whether the seal ring has come off the accommodation groove and a seal failure has occurred.

Preferably, the positioning means and the inspection protrusion are arranged at the other end portions of the first and second divided bodies on a side surface facing the tube axis direction of the resin tube.
According to the above configuration, it is possible to determine whether the seal is good or bad using the seal determination jig from the tube axis direction.

Preferably, the seal discrimination jig has an opening, and an edge surface of the opening remote from the first divided body is provided as the first opposing surface, and the seal ring is normally accommodated in the accommodation groove. When the two resin pipes are connected in a state in which the two resin pipes are connected, the inspection protrusion is accommodated in the opening.
According to the above configuration, it is confirmed whether or not the inspection convex portion of the second divided body is accommodated in the opening of the seal determining jig, so that it is possible to determine whether the seal is good or bad with good visibility.

Preferably, the seal discrimination jig is removable not only from the second divided body but also from the first divided body.
According to the above configuration, the configuration of the connecting device can be simplified.

Preferably, the positioning means includes a positioning convex portion protruding from the side surface of the other end of the first divided body, and a positioning convex portion formed at a portion of the seal discriminating jig located on the first divided body side and abutting the positioning convex portion. It is composed of a positioned portion.
According to the above configuration, the seal discriminating jig can be easily positioned.

Preferably, a surface of the positioning convex portion facing the second divided body is provided as a positioning surface, the seal discriminating jig has a plate shape, and an edge of the seal discriminating jig on the first divided body side is preferably provided as a positioning surface. , corresponds to the positioning surface as the positioned portion.
According to the above configuration, the configuration of the seal discrimination jig can be simplified.

Preferably, an auxiliary convex portion projecting in the first direction is formed on an edge of the seal discriminating jig, and the auxiliary convex portion contacts a side surface of the positioning convex portion, so that the seal discriminating jig is , and also in a second direction perpendicular to the tube axis direction and the first direction.
According to the above configuration, since the seal discriminating jig can also be positioned in the second direction (the direction in which the hinge means and the fastening means face each other), the seal discriminating jig can more efficiently discriminate whether the seal is good or bad. .

Preferably, a pair of the positioning protrusions are arranged apart from each other in the second direction, and the auxiliary protrusion of the seal discriminating jig is inserted between the pair of positioning protrusions.
According to the above configuration, the seal discriminating jig can be reliably positioned in the second direction.

Preferably, an engaging portion extending toward the second dividing body is provided on a radially outer side of the one end of the first divided body, an engaging hole is formed in the engaging portion, and the engaging portion is provided with an engaging hole. The one end of the second divided body is provided with an engagement protrusion that protrudes radially outward, and the engagement protrusion of the second divided body is rotated into the engagement hole of the first divided body. The hinge means is configured such that the engagement hole has a main hole that accommodates the engagement protrusion in a state where the first and second divided bodies are fastened by the fastening means. and an escape recess formed on the opposite side of the second divided body and connected to the main hole.
According to the above configuration, the configuration of the hinge means can be simplified.

Preferably, the first and second divided bodies are made of resin containing glass fiber.

According to the present invention, it is possible to easily determine whether the seal between the abutting surfaces of the resin pipes is good or bad.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a resin pipe connection device according to an embodiment of the present invention in a state where the connection of the resin pipes is completed, with a portion of the connection device and the resin pipe cut away. It is a perspective view showing a pair of upper and lower divided bodies of the above-mentioned connection device in a separated state, and a half of the pair of divided bodies in the width direction is shown in cross section. It is a cross-sectional view which shows the connection process of the resin pipe by the said connection apparatus in order, (A) shows the state in the middle of a connection process, and (B) shows the state where the connection process is completed. It is a longitudinal cross-sectional view which shows the connection process of the resin pipe by the said connection apparatus in order, (A) shows the state in the middle of a connection process, and (B) shows the state where the connection process is completed. FIG. 2 is a perspective view showing the connecting device when the connection of the resin pipe is completed with the seal ring set normally; the resin pipe and the fastening means are omitted, and some of the components of the seal discriminating means are shown. ing. FIG. 2 is an enlarged perspective view of a seal discriminating jig which is a main component of the seal discriminating means. FIG. 6 is a view corresponding to FIG. 5 showing a state in which a seal discriminating jig is attached to the upper and lower divided bodies, and it has been confirmed that the seal is good. 8 is a front view showing the state of FIG. 7. FIG. FIG. 9 is a front view showing an enlarged main part of FIG. 8;

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
Composition of resin tube
First, the resin pipes 1 and 2 to be connected will be explained with reference to FIGS. 1 and 4. The resin pipes 1 and 2 are made of resin such as polyethylene and have annular flanges 1a and 2a at one end. The resin pipes 1 and 2 are obtained by butt welding a short pipe having the flange portions 1a and 2a and a long resin pipe main body. The tip surfaces of the flange portions 1a, 2a are abutting surfaces 1x, 2x perpendicular to the tube axis L, and the opposite surfaces are tapered surfaces 1y, 2y. An annular housing groove 1z is formed in the abutting surface 1x of the flange portion 1a of one resin pipe 1, and a seal ring 3 is fitted into this housing groove 1z.

In-cores 4 each having a short cylindrical shape are arranged on the inner periphery of one end of the resin pipes 1 and 2, respectively. The in-core 4 is made of stainless steel such as SUS304, and has an annular collar 4a projecting radially and outwardly at one end thereof. By engaging the collar 4a with the annular recesses 1b and 2b formed on the inner periphery of the tips of the resin tubes 1 and 2, the in-core 4 is inserted into the resin tubes 1 and 2 while its axial movement is restricted. It is installed. Since the collar 4a is accommodated in the recesses 1b and 2b, it does not interfere with the butting of the flange portions 1a and 2a, which will be described later.

Basic Configuration of Connecting Device Next, the basic configuration of the connecting device 5 for connecting the resin pipes 1 and 2 will be explained with reference to FIGS. 1 to 4. The connecting device 5 includes a pair of upper and lower divided bodies, that is, an upper divided body 10 (first divided body) and a lower divided body 20 (second divided body).
The divided bodies 10 and 20 are made of, for example, glass fiber-reinforced resin (nylon, polypropylene, polyacetal, etc.), and have substantially semi-cylindrical main bodies 11 and 21, respectively. The inner diameters of the main bodies 11 and 21 are approximately equal to the outer diameters of the resin tubes 1 and 2. Both side surfaces of the main bodies 11 and 21 of the divided bodies 10 and 20 in the direction of the tube axis L are orthogonal to the tube axis L.

The main bodies 11 and 21 of the divided bodies 10 and 20 have opposite end surfaces facing each other when the resin pipes 1 and 2 are connected, as will be described later. Hereinafter, this surface will be referred to as the end facing surface. The main body portions 11, 21 have a circumferential dimension shorter than that of a complete semi-cylindrical cylinder. That is, the opposing end surfaces 11a and 11b of the main body 11 of the upper divided body 10 are slightly set back from a plane passing through the radial center of the inner circumference of the main body 11, and are parallel to this plane. Similarly, the opposing end surfaces 21a and 21b of the main body 21 of the lower divided body 20 are slightly set back from a plane passing through the radial center of the inner circumference of the main body 21, and are parallel to this plane. .

Fitting grooves 12 and 22 are formed in the inner circumferential surfaces of the main bodies 11 and 21 of the divided bodies 10 and 20, and extend in a substantially semicircular manner in the circumferential direction. Tapered surfaces 12a and 22a are formed on both sides of the fitting grooves 12 and 22 in the axial direction. The taper angles of the tapered surfaces 12a, 22a are equal to the tapered surfaces 1y, 2y of the flange portions 1a, 2a of the resin pipes 1, 2. The cross-sectional shape of the fitting grooves 12 and 22 is approximately equal to the cross-sectional shape of the flange portions 1a and 2a in a state where the abutting surfaces 1x and 2x of the flange portions 1a and 2a are in contact, as will be described later.
Note that a thinning recess (only the thinning recess 13 of the main body 11 is shown) extending in the circumferential direction is formed on the outer periphery of the main body portions 11 and 21.

An engaging portion 15 is provided at one end of the main body 11 of the upper divided body 10 so as to be integral with the main body 11 . The engaging portion 15 includes a protruding portion 15a that protrudes radially outward from one end of the main body portion 11, and a protruding portion 15a that is perpendicular to the protruding portion 15a and extends downward (to the lower divided body 20) beyond the end facing surface 11a. 15b.

An engagement hole 16 is formed in the engagement portion 15 of the upper divided body 10 . The engagement hole 16 has a main hole 16a formed in the extension 15b and penetrating in the radial direction, and a relief recess 16b formed in the protrusion 15a and connected to the main hole 16a.
The main hole 16a has a substantially rectangular shape and occupies a space between the lower surface 16x of the engagement hole 16 and the extended surface of the end facing surface 11a of the main body 11. This lower surface 16x is provided as a load receiving surface as described later.
The escape recess 16b is located above the extended surface of the end facing surface 11a (on the opposite side of the lower divided body 20), and is open on the outside in the radial direction. The lateral dimension of the escape recess 16b is equal to the lateral dimension of the main hole 16a.

An engagement protrusion 25 extending radially outward is formed integrally with the main body 21 at one end of the main body 21 of the lower divided body 20 . The cross-sectional shape of the engaging protrusion 25 is rectangular, and its upper surface is flush with the end facing surface 21a of the main body portion 21. The vertical and horizontal dimensions of the engagement protrusion 25 are slightly shorter than the vertical and horizontal dimensions of the main hole portion 16a of the engagement hole 16 of the upper divided body 10.
As will be described later, the engagement protrusion 25 of the lower divided body 20 is inserted into the engagement hole 16 of the upper divided body 10, thereby forming the hinge means H. This hinge means H connects the upper divided body 10 to the lower divided body 20 so as to be relatively rotatable along a plane orthogonal to the tube axis L of the resin tubes 1 and 2.

At the other ends of the main bodies 11 and 21 of the divided bodies 10 and 20, receiving parts 18 and 28 that protrude radially outward are formed integrally with the main bodies 11 and 21, respectively. The lower surface of the receiving portion 18 is flush with the end facing surface 11b of the main body portion 11, and the upper surface of the receiving portion 28 is flush with the end facing surface 21b of the main body portion 21. Through holes 18a, 28a are formed in the receiving parts 18, 28. A pair of anti-rotation protrusions 29 are formed on the lower surface of the receiving portion 28, located on both sides of the through hole 28a.
As shown in FIG. 3(B), a fastening means 30 for fastening the receiving parts 18 and 28 includes a bolt 31 and a nut 32.

Process of connecting resin pipes using the connecting device The process of connecting the resin pipes 1 and 2 using the connecting device 5 will be described. As shown in FIGS. 3(A) and 4(A), first, the flange portions 1a, 2a of the resin pipes 1, 2 are placed in the seal ring 3 accommodated in the receiving groove 1z of the abutting surface 1x. Place it on the lower divided body 20 while bringing it close enough to lightly touch the abutting surface 2x. The flange portions 1a and 2a are aligned with the fitting groove 22, and a portion thereof is accommodated in the fitting groove 22.

Next, the upper divided body 10 is brought closer to the lower divided body 20 from the side in an inclined position, and the engagement protrusion 25 is inserted into the engagement hole 16 of the engagement portion 15 . At this time, a portion of the tip of the engagement protrusion 25 comes off from the main hole 16a of the engagement hole 16, but can be received in the escape recess 16b. Therefore, the upper divided body 10 can be deeply placed over the flange parts 1a and 2a without the engagement protrusion 25 interfering with the engagement part 15.

Specifically, in the initial stage when the engagement protrusion 25 is inserted into the engagement hole 16 and the hinge means H is configured, the deepest end E of the engagement groove 12 of the upper divided body 10 (of the hinge means H) The opposite end) extends over half of the upper half of the flange portions 1a, 2a in the circumferential direction. That is, the end E of the upper divided body 10 is located on the left side (on the opposite side of the hinge means H) from the vertical plane V passing through the centers of the flange parts 1a and 2a in FIG. 3(A).

Next, by rotating the upper divided body 10 around the fulcrum F so as to approach the lower divided body 20, the receiving portion 18 of the upper divided body 10 approaches the receiving portion 28 of the lower divided body 20 and faces each other. . In this state, part of the flange portions 1a and 2a is also accommodated in the fitting groove 12 of the upper divided body 10. Furthermore, the engagement protrusion 25 of the lower divided body 20 fits within the main hole 16a of the engagement hole 16 of the upper divided body 10.

Next, with the nut 32 unrotatably fitted between the pair of anti-rotation protrusions 29, the bolt 31 is inserted through the receiving parts 18 and 28 of the divided bodies 10 and 20, as shown in FIG. 3(B). Pass it through the holes 18a and 28a, screw it onto the nut 32, and turn it in the tightening direction. Thereby, the lower divided body 20 and the upper divided body 10 are tightened with the flanges 1a and 2a of the resin pipes 1 and 2 sandwiched therebetween. This tightening force is converted into an axial force that brings the flanges 1a, 2a closer together by the action of the tapered surfaces 12a, 22a on both sides of the fitting grooves 12, 22 and the tapered surfaces 1y, 2y of the flanges 1a, 2a. Ru. As a result, as shown in FIG. 4(B), the abutting surfaces 1x and 2x of the flange portions 1a and 2a are abutted against each other, and the seal ring 3 accommodated in the accommodation groove 1z of one of the abutting surfaces 1x undergoes elastic deformation. Accordingly, it comes into close contact with the other abutting surface 2x, thereby sealing between the abutting surfaces 1x and 2x. In this way, the connection process is completed.

By tightening the bolt 31, the receiving parts 18 and 28 come close to each other, and in the hinge means H, the engaging protrusion 25 strongly hits the load receiving surface 16x of the engaging hole 16 of the engaging part 15.

Seal Discrimination Means As described above, when the resin pipes 1 and 2 are connected by the connecting device 5 with the seal ring 3 normally accommodated in the accommodation groove 1z, the abutting surfaces 1x and 2x of the resin pipes 1 and 2 The space is well sealed and no leakage occurs.
However, if the resin pipes 1 and 2 are connected with a part of the seal ring 3 detached from the housing groove 1z (de-ringing state), a sealing failure will occur between the abutting surfaces 1x and 2x of the resin pipes 1 and 2. , water leakage occurs.

In the present invention, the divided body Attention was paid to the difference in the size of the gap between the end facing surfaces 11b and 21b of Nos. 10 and 20.
In detail, when the seal ring 3 is set normally, the gap between the facing surfaces 11b and 21b of the fastening side ends of the divided bodies 11 and 12 is as shown in FIGS. 3(B) and 5. small. On the other hand, when the seal ring 3 is out of the housing groove 1z, the seal ring 3 is interposed between the abutting surfaces 1x, 2x of the resin pipes 1, 2, so the abutting surfaces 1x, 2x do not abut against each other. As a result, the divided bodies 10 and 20 are restricted from coming close to each other, and the gap between the end facing surfaces 11b and 21b increases.
In this embodiment, when the seal ring 3 is properly set and connected, the gap dimension Dx between the end facing surfaces 11b and 21b is 1.7 mm or less, and when the seal ring 3 is connected in a de-ringed state, the gap dimension Dx is 1.7 mm or less. The gap dimension Dx is 5.8 mm or more.

The connecting device 5 of the present invention includes means S (see FIGS. 7 to 9) for determining the quality of the seal based on the difference in the gap size Dx. In order to facilitate the explanation of the seal discriminating means S, the X-axis and Y-axis directions (see FIGS. 5 and 8), which are orthogonal to the tube axis L and mutually orthogonal, will be defined. The X-axis direction (second direction) is the direction in which the hinge means H and the tightening means 30 face each other, and the Y-axis direction (first direction) is the direction in which the divided bodies 10 and 20 face each other.

The seal discriminating means S includes a seal discriminating jig 40 that extends between the divided bodies 10 and 20, a positioning means 50 that positions the seal discriminating jig 40 in the X-axis direction and the Y-axis direction, and is formed on the lower divided body 20. The inspection convex portion 60 has a The positioning means 50 and the inspection protrusion 60 are located on the side surfaces of the upper divided body 10 and the lower divided body 20 (one side surface facing the tube axis direction at the fastening side ends of the main bodies 11 and 21 of the divided bodies 10 and 20). are located respectively.

The seal determining jig 40 is separate from the divided bodies 10 and 20, and is removably attached so as to span over the divided bodies 10 and 20 when determining the quality of the seal as described later. . The seal discrimination jig 40 is made of a rectangular plate having a uniform thickness and elongated in the Y-axis direction, and the upper edge 41 (the edge on the upper divided body 10 side) is provided as a positioned portion that performs the function described below. . An auxiliary protrusion 42 is formed at the center of the edge 41 and protrudes in the Y-axis direction.

A rectangular opening 45 is formed in the lower part of the seal discrimination jig 40 (the part on the lower divided body 20 side). The lower edge surface of this opening 45 (the surface facing the upper divided body 10) is provided as a first opposing surface 46 that functions as described below. The end edge 41 and the first opposing surface 46 as the portion to be positioned are parallel to each other, and the distance between them is indicated by the symbol Ds in FIG. 9 .

A pair of positioning protrusions 51 are formed on the side surface of the main body portion 11 of the upper divided body 10 . These pair of positioning protrusions 51 have a rectangular cross section, are spaced apart from each other in the X-axis direction, and their lower surfaces (the surfaces facing the lower divided body 20) are provided as the positioning surfaces 52. This positioning surface 52 is parallel to the end facing surface 11b of the upper divided body 10, and the distance between the two is indicated by the symbol Dy in FIG.
The edge 41 and the auxiliary convex portion 42 of the seal discriminating jig 40 and the pair of positioning convex portions 51 constitute the positioning means S.

The inspection protrusion 60 has a rectangular cross section elongated in the X-axis direction, and its lower surface (the surface facing the opposite side of the upper divided body 10) is provided as a second opposing surface 61. The second opposing surface 61 is parallel to the end opposing surface 21b of the lower divided body 20, and the distance between the two is indicated by the symbol Dz in FIG.
It is preferable that the protruding heights of the positioning convex portion 51 and the inspection convex portion 60 and the thickness of the seal discriminating jig 40 are 5 mm or less.

Seal Discrimination Step After the fastening by the fastening means 30 is completed, the seal discriminating means S determines whether the seal is good or bad. As shown in FIGS. 7 to 9, the seal discriminating jig 40 can be operated by applying the edge 41 of the seal discriminating jig 40 to the positioning surfaces 52 of the pair of positioning convex portions 51 formed on the upper divided body 10. Positioning can be performed in the Y-axis direction. At this time, by inserting the auxiliary convex part 42 of the seal discriminating jig 40 between the pair of positioning convex parts 51 (by applying it to the side surface of the positioning convex part 51), the seal discriminating jig 40 can also be moved in the X-axis direction. Can be positioned.

With the seal discriminating jig 40 positioned relative to the upper divided body 10, bring the seal discriminating jig 40 close to the lower divided body 20, and insert the inspection convex portion of the lower divided body 20 into the opening 45 of the seal discriminating jig 40. Try to see if 60 will fit. The inspection protrusion 60 enters the opening 45, and the first opposing surface 46 of the opening 45 faces the second opposing surface 61 of the inspection protrusion 60 in the Y-axis direction with a slight gap (substantially engaged state). In this case, the resin pipes 1 and 2 are connected by the connecting device 5 with the seal ring 3 properly set in the accommodation groove 1z, and the abutting surfaces 1x and 2x of the resin pipes 1 and 2 are connected. It can be confirmed that the seal is in good condition.
In this embodiment, the auxiliary convex portion 42 of the seal discriminating jig 40 is inserted between the pair of positioning convex portions 51 of the upper divided body 10, so that the seal discriminating jig 40 is also positioned in the X-axis direction. Therefore, the opening 45 of the seal discrimination jig 40 can be positioned in the X-axis direction with respect to the inspection convex portion 60 of the lower divided body 20, so that the seal discrimination work can be performed efficiently.

As described above, if the seal ring 3 is out of the housing groove 1z, the gap dimension Dx between the end facing surfaces 11b and 21b becomes large even after the fastening by the fastening means 30 is completed. The inspection protrusion 60 of the lower divided body 20 does not enter the opening 45 of the seal discriminating jig 40 positioned as described above, and the lower part 47 of the opening 45 (see FIG. 9) hits the inspection protrusion 60. . That is, the first opposing surface 46 and the second opposing surface 61 are not arranged to face each other in the Y-axis direction. In this case, it can be confirmed that the connection is made in a de-ringed state and that the seal between the abutting surfaces 1x and 2x of the resin pipes 1 and 2 is defective.

This will be explained in detail using the dimensions shown in FIG. In the state where the seal discriminating jig 40 is positioned, the separation distance Da between the first opposing surface 46 of the seal discriminating jig 40 and the end opposing surface 21b of the lower divided body 20 can be expressed by the following formula. can.
Da=Ds-Dx-Dy...(1)
The conditions under which the inspection protrusion 60 enters the opening 45 of the seal discrimination jig 40 and the first opposing surface 46 of the opening 45 is arranged to face the second opposing surface 61 of the inspection protrusion 60 in the Y-axis direction are expressed by the following formula. can be expressed.
Da≧Dz...(2)
As described above, Dz is the distance between the second opposing surface 61 and the end opposing surface 21b.
As is clear from the above equation (1), if the gap Dx between the end facing surfaces 11b and 21b is sufficiently small, the distance Da becomes sufficiently large and the equation (2) can be satisfied. In this embodiment, when the gap Dx≦1.7 mm, Ds, Dy, and Dz are set so as to satisfy equation (2).

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit thereof.
A single positioning protrusion extending in the X-axis direction may be used instead of a pair of positioning protrusions separated in the X-axis direction. In this case, the seal discriminating jig may be provided with an auxiliary convex portion that corresponds to at least one of both side surfaces in the X-axis direction of the positioning convex portion to position the seal discriminating jig in the X-axis direction. good.
The positioning portion may be a recess formed in the first divided body. In this case, the portion to be positioned of the seal discrimination fitting may be a convex portion that fits into the positioning recess.
In the above embodiment, both sides of the opening in the lower part of the seal discriminating jig are closed in the X-axis direction, but one side may be open.
In the embodiment described above, the determination of the quality of the seal by the seal determination jig is performed after the tightening device completes tightening, but it may be performed before the tightening process or during the tightening process.

INDUSTRIAL APPLICATION This invention can be applied to the apparatus which connects the resin pipe which has a flange part at an end.

1, 2 Resin pipes 1a, 2a Flange parts 1x, 2x Abutting surfaces 1y, 2y Tapered surface 1z Accommodating groove 3 Seal ring 5 Connection device 10 Upper divided body (first divided body)
20 Lower divided body (second divided body)
11b, 21b End opposing surfaces (opposing surfaces at the other end)
12, 22 Fitting grooves 12a, 22a Tapered surface 30 Fastening means 40 Seal discrimination jig 41 Edge (positioned part)
42 Auxiliary convex portion 45 Opening 46 First opposing surface 50 Positioning means 51 Positioning convex portion 52 Positioning surface 60 Inspection convex portion 61 Second opposing surface H Hinge means S Seal determining means

Claims (10)

In a connecting device for connecting two resin pipes each having an annular flange portion formed at one end thereof and having an abutting surface and a tapered surface,
first and second divided bodies; hinge means for rotatably connecting one end of the first and second divided bodies to each other along a plane perpendicular to the tube axis of the resin tube; A fastening means for tightening the other ends of the divided body so as to bring them closer together,
The first and second divided bodies each have a fitting groove extending in an arc shape on an inner circumferential surface, and the fitting groove has a tapered surface on both sides thereof, and when tightened by the fastening means, the fitting groove By pressing the tapered surfaces of the flange portions of the two resin tubes, the opposing surfaces of the other end portions of the first and second divided bodies approach each other, and the two resin tubes The abutting surfaces of the flange portions of the flange portions abut each other, and the seal ring accommodated in the annular housing groove of the abutting surface of one resin tube is brought into close contact with the abutting surface of the other resin tube, thereby forming two pipes. The abutting surfaces of the resin pipes are sealed,
Further, it includes a seal determining means for determining whether or not the sealing between the abutting surfaces by the seal ring is good.
The seal discriminating means includes a seal discriminating jig that extends between the first divided body and the second divided body, and a seal discriminating jig that is connected to at least the first, a positioning means for positioning the second divided body in the opposing first direction; and an inspection convex portion formed on the side surface of the other end of the second divided body,
The seal discrimination jig has a first facing surface facing the first divided body at a portion located on the second divided body side, and the inspection convex portion has a second facing surface facing the opposite side of the first divided body. It has a surface,
Only when the two resin pipes are connected with the seal ring normally accommodated in the accommodation groove, the first opposing surface of the positioned seal discriminating jig and the second opposing surface of the second divided body are connected. The distance Da between the opposing surface of the other end is equal to or greater than the distance Dz between the second opposing surface of the inspection protrusion and the opposing surface of the other end of the second divided body, and . A resin pipe connecting device, wherein the second opposing surface is arranged to face the first direction. The resin according to claim 1, wherein the positioning means and the inspection convex portion are arranged on a side surface facing the tube axis direction of the resin tube at the other end portions of the first and second divided bodies. Pipe connection device. The seal discriminating jig has an opening, an edge surface of the opening remote from the first divided body is provided as the first opposing surface, and the seal ring is normally accommodated in the accommodation groove. 3. The resin pipe connecting device according to claim 1, wherein the inspection protrusion is accommodated in the opening when two resin pipes are connected. 4. The connection device according to claim 1, wherein the seal discriminating jig is attachable to and detachable from not only the second divided body but also the first divided body. The positioning means includes a positioning convex portion protruding from the side surface of the other end of the first divided body, and a positioned portion formed in a portion of the seal discriminating jig located on the first divided body side and abutting the positioning convex portion. 5. The resin pipe connecting device according to claim 4, wherein the resin pipe connecting device is configured by: A surface of the positioning convex portion facing the second divided body is provided as a positioning surface,
6. The resin pipe according to claim 5, wherein the seal discriminating jig has a plate shape, and an edge of the seal discriminating jig on the first divided body side is in contact with the positioning surface as the positioned portion. Connection device. An auxiliary protrusion protruding in the first direction is formed on the edge of the seal discriminating jig, and when the auxiliary protrusion comes into contact with the side surface of the positioning protrusion, the seal discriminating jig 7. The resin pipe connecting device according to claim 6, wherein the resin pipe connecting device is positioned also in an axial direction and a second direction perpendicular to the first direction. 8. The positioning protrusions are arranged as a pair apart from each other in the second direction, and the auxiliary protrusion of the seal discriminating jig is inserted between the pair of positioning protrusions. Connection device. An engaging portion extending toward the second dividing body is provided on the radially outer side of the one end of the first divided body, and an engaging hole is formed in the engaging portion,
The one end of the second divided body is provided with an engagement protrusion that protrudes radially outward,
The hinge means is configured by rotatably inserting the engagement projection of the second division body into the engagement hole of the first division body,
The engagement hole has a main hole portion that accommodates the engagement protrusion in a state where the first and second divided bodies are fastened together by the fastening means, and is continuous with the main hole portion of the second divided body. 9. The resin pipe connecting device according to claim 1, further comprising a relief recess formed on the opposite side. 10. The resin pipe connecting device according to claim 1, wherein the first and second divided bodies are made of resin containing glass fiber.

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