JP5257742B2 - Pipe end protection member - Google Patents

Description

The present invention is used in a pipe for transporting a fluid such as gas or water, about the pipe end protection member for protecting a pipe end of the multi-layer resinous tube having a metal reinforcing layer.

  Conventionally, a single pipe represented by a steel pipe or a resin pipe has been used to transport a fluid such as gas or water. However, when steel pipes are used for water pipes, there is a problem that the wetted parts such as the inner surface of the pipe and the end of the pipe are corroded to generate red water, and the mass is large and the workability of the pipe is poor. On the other hand, resin pipes are lightweight and have excellent pipe workability and corrosion resistance, but the strength is low compared to steel pipes, so in order to obtain considerable strength against internal pressure, the thickness must be increased. In other words, there is a problem that the pipe diameter is increased. Therefore, as shown in FIG. 12, a multilayer resin pipe 2 in which a reinforcing layer (metal layer 22) is provided between an inner layer (first resin layer 21) and an outer layer (second resin layer 23) is proposed. ing. The multilayer resin tube 2 is advantageous in that it is lightweight and excellent in corrosion resistance and has a high pressure resistance against internal pressure.

  When piping work is performed using this multilayer resin pipe, after cutting the multilayer resin pipe to a predetermined length, as shown in FIG. 13, for example, an electric heating coil 91 is provided in the vicinity of the inner peripheral surface (fused surface). The pipes are connected by the fusion joint 9. Accordingly, since the metal layer 22 is exposed at the cut surface (end surface) of the multilayer resin pipe, the exposed metal layer 22 may come into contact with the liquid and the end portion of the pipe may corrode. In addition, if water enters the gap between the resin layers 21 and 23 and the metal layer 22 from the wetted part, the metal layer 22 other than the end may be corroded, and further, water may enter the gap. When the pressure is applied, it causes peeling of the resin layers 21 and 23 from the metal layer 22.

  Therefore, it is necessary to seal the end of the multilayer resin tube 2 where the metal layer 22 is exposed. In Patent Document 1, as in the multilayer resin pipe 2 described above, the end of a steel pipe having a three-layer structure (an inner and outer surface resin-coated steel pipe having a structure in which the inner and outer surfaces of the steel pipe are coated with a synthetic resin) is anticorrosive (anti-corrosion). In order to rust), a pipe end face rust prevention method as shown in FIG. 14 has been proposed. This pipe end rust-proofing method is formed on the inner periphery of the end of the metal tube 100 whose inner and outer peripheral surfaces are coated with the synthetic resins 101 and 102 so that the outer periphery is tapered and one end has a small diameter. The fitting member 200 integrally formed with the flange portion 201 at the end is press-fitted while rotating, and the synthetic resin 101 covering the inner peripheral surface of the metal tube 100 and the outer peripheral portion 202 of the fitting member 200 are fused by friction heat. In this way, the flange portion 201 is pressed against the end surface of the metal tube 100 to prevent the tube end of the metal tube 100 from being rusted.

  Further, in Patent Document 2, as shown in FIG. 15, a connection auxiliary pipe 400 having the same diameter as the synthetic resin pipe and having comb-like protrusions 401 at both ends is provided between the synthetic resin pipes 300 and 300. Then, after the end surfaces of the synthetic resin pipe 300 and the connection auxiliary pipe 400 are brought into contact with each other, the connection auxiliary pipe 400 is rotated at a high speed so that the contact portion generates heat and is brought into close contact by heat fusion.

JP-A-61-233292 (pages 1 to 4, FIGS. 1 to 4) JP-A-53-13675 (pages 1 to 3, FIGS. 1 to 3)

  However, the method described in Patent Document 1 joins the outer peripheral surface of the fitting member and the inner peripheral surface of the metal tube, so that it is not possible to prevent the intrusion of fluid from the end portion on the inner diameter side of the metal tube. Although possible, there is a problem in that the outer peripheral surface of the metal tube and the flange portion are not integrated and there is a slight gap, so that it is not possible to completely prevent the fluid from entering the end of the metal tube. Further, since the fitting member 200 is provided on the inner peripheral surface of the pipe, there is a problem that the cross-sectional area of the flow passage in this portion is reduced and the flow resistance is increased.

  Moreover, although the joining method described in patent document 2 can join resin members uniformly, when it applies to joining of the multilayer resin pipe which has a metal layer inside, it is rigid on the multilayer resin pipe side. Since the high metal layer receives the pressing force of the synthetic resin member, the contact surface between the resins is not sufficiently pressurized. It is conceivable that the contact surfaces between the resins do not generate heat uniformly due to this, and normal bonding cannot be performed.

  Accordingly, a first object of the present invention is to provide a tube end protection member that can be in close contact with the end face of a multilayer resin tube having a metal layer therein.

Another object related to the present invention is to provide a rotary fusing tool capable of reliably joining a pipe end protection member to an end face of a multilayer resin pipe having a resin layer on the inner and outer peripheral portions of a metal layer. It is.

In order to achieve the first object, the tube end protection member of the present invention has an end surface that contacts an end surface of a multilayer resin tube having a metal layer therein, and a rotating member is engaged with the other end side. in the pipe end protection member to which the end faces is made of a resin ring which is bonded fused to the end surface of the resin ring, said annular groove metal layer penetrates the multilayer resin pipe is formed, the width of the annular groove is the a shall be provided to 5 times twice the thickness of the metal layer.

In the tube end protection member of the present invention , the depth of the annular groove is such that the metal layer does not hit the bottom of the annular groove when the tube end protection member is fused to the multilayer resin tube. It is preferable to be provided .
Further, in the tube end protection member of the present invention , the outer peripheral portion of the tube end protection member has a tapered shape that is gently inclined toward the end opposite to the side fused to the end of the multilayer resin tube. It is preferable to be provided .

In order to achieve another object related to the present invention , a rotary fusing tool that is a related technique of the present invention is connected to a clamp portion that fixes an outer peripheral surface of a multilayer resin tube and a driving means, and the multilayer resin tube A movable portion that rotatably holds a resin ring having an end surface fused to the end surface of the multi-layer resin tube, and a guide portion that guides the movable portion along the tube axis direction. And pressurizing means for pressing the end face of the resin ring against the end face of the multilayer resin tube.

In the rotary fusing tool that is a related technique of the present invention, the clamp portion has a first flange portion at one end, and an outer peripheral tapered surface that is tapered toward the end portion is formed on the outer periphery of the other end. A pressing surface that is pressed against the outer peripheral surface of the connecting pipe is formed on the side, and has a plurality of wedge-shaped clamp members arranged in the circumferential direction of the connecting pipe, and the outer peripheral tapered surface is provided on the inner periphery of one end. A ring member having an inner circumferential tapered surface having a large diameter toward the end portion and having a second flange portion at the other end, and a fastening member for coupling the second flange portion and the movable portion are provided. Can do.

In the rotary fusing tool that is a related technique of the present invention , the second flange portion has one or two or more protrusions having a gentle inclined surface on one end side surface, and the pressurizing means includes: A second ring having a recess in which the protrusion fits on a surface opposite to a surface on one end side of the second flange, and is rotatably provided along the inclined surface with respect to the second flange portion. It can have a member.

In the rotary fusing tool that is a related technique of the present invention, the movable part may have a core member that is inserted across the inner diameter side of the multilayer resin tube and the inner diameter side of the resin ring.

In the rotary fusing tool that is a related technique of the present invention , it is preferable that the core member is provided to be rotatable relative to the rotary member that holds the resin ring.

In the rotary fusing tool that is a related technique of the present invention , it is preferable that the core member is formed to have a dimension that allows a predetermined gap between the outer peripheral surface and the inner peripheral surface of the multilayer resin pipe. Specifically, the size of the gap is more preferably 0.5 mm to 2.0 mm.

In the rotary fusing tool that is a related technique of the present invention , when the connection pipe is fixed to the clamp portion, a positioning member that sets a predetermined gap between the clamp portion and the movable portion is provided. desirable.

According to the pipe end protecting member of the present invention, a rotation transmitting portion for transmitting the rotational force of the rotating means is provided at one end portion thereof, and a fusion surface pressed against the end portion of the multilayer resin pipe is formed at the other end portion. Therefore, the fused surface is fused to the end portion of the multilayer resin tube, and exposure of the metal layer at the end portion can be reliably prevented. Therefore, the metal layer of the multilayer resin tube is reliably prevented from corrosion. Further, an annular groove portion into which the metal layer of the multilayer resin tube enters is formed on the end surface of the resin ring, and the width of the annular groove portion is provided to be twice to five times the thickness of the metal layer. Even a multilayer resin pipe having a large eccentricity of the layer is reliably prevented from corrosion.

Further, according to the rotary fusing tool that is a related technique of the present invention , the tube end protection member held by the movable portion is urged toward the end of the connection tube clamped by the fixed clamp portion by the elastic member. Accordingly, the annular member is uniformly pressed against the connecting pipe at the time of fusion, and the annular member and the connecting pipe can be reliably fused.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
1 is a perspective view of a tube end protection member according to an embodiment of the present invention, FIG. 2 is a half sectional view of the tube end protection member according to the embodiment of the present invention, and FIG. 3 is a rotation that is a related technique of the present invention. FIG. 4 is a perspective view showing a state where the wedge-shaped clamp member and the ring member are assembled, FIG. 5 is a perspective view showing a rotating member, and FIGS. 6 and 7 explain the operation of the pressurizing means. FIG.

  A pipe end protection member 1 shown in FIG. 1 is a ring-shaped member having the same inner and outer diameters as the multilayer resin pipe 2 (hereinafter referred to as a connection pipe 2) shown in FIG. It becomes the annular (two strips) fused surface 11 pressed by the edge part of this. As shown in FIG. 2, an annular groove 12 is formed on the fusion surface 11 so that the longitudinal cross-section is U-shaped, and the width W thereof is determined when the tube end protection member 1 and the connection pipe 2 are fused. The thickness of the metal layer 22 is set such that W ≧ t so that the metal layer 22 can enter the inside (see FIGS. 2 and 12). In particular, the width W of the annular groove 12 is such that the metal layer 22 can surely enter the annular groove 12 even when the eccentricity of the metal layer 22 is large and the roundness of the metal layer 22 is poor. More preferably, the thickness is set to be about 2 to 5 times the thickness t of the metal layer 22. Further, the depth of the annular groove 12 is preferably set to such a dimension that the metal layer 22 does not abut against the bottom of the annular groove 12 when the tube end protection member 1 is fusion bonded to the connecting pipe 2.

  The other end side of the tube end protection member 1 has a shape in which a plurality of concave portions 13 and convex portions 14 are alternately arranged along the circumferential direction. Further, the outer peripheral portion on the other end side is formed in a tapered shape that is gently inclined so as to taper toward the end face.

  The pipe end protection member 1 has the same melting point as the material forming the first resin layer 21 and the second resin layer 23 of the connecting pipe 2 and is formed of the same or the same type of thermoplastic resin as the resin layer. Is done. For example, when the resin layers 21 and 23 of the connecting pipe 2 are polyethylene, it is preferable that the pipe end protection member 1 is formed of a polyolefin resin such as polyethylene.

  In order to fuse the pipe end protection member 1 to the end face of the connecting pipe 2, for example, a rotary welding tool shown in FIG. 3 can be used. In order to support the connecting pipe 2, the rotary fusing tool 3 is movable so as to rotatably support the pipe end protection member 1 so as to face the end face of the connecting pipe 2 and a clamp part 4 fixed to the end part thereof. Part 5, guide rod 6 for enabling movable part 5 to move along the central axis of connecting pipe 2 with respect to clamp part 4, and a pipe end protecting member on the end face of connecting pipe 2 at the time of rotational fusion 1 includes an elastic member 7 (e.g., a compression coil spring) that urges the movable portion 5 in a direction in which the end surface of 1 is pressed, and a pressurizing unit 8 that applies an urging force (restoring force) of the elastic member 7 to the movable portion 5. Details of each part will be described with reference to FIGS.

  The clamp portion 4 has a first flange portion 411 formed at one end portion and an outer peripheral taper portion 412 that is tapered toward the end surface on the tube end protection member 1 side formed at the other end portion and connected thereto. A wedge-shaped clamp member 41 having an inner surface 413 having the same curvature as the outer diameter of the tube 2 is provided. The wedge-shaped clamp member 41 has an inner peripheral taper portion 421 having a downward slope like the outer peripheral taper portion 412 and a second flange portion 422 formed at the end portion on the tube end protection member 1 side. A U-shaped clamp portion 4 is formed in combination with an annular ring member 42 having an inner surface 423 with a large inner diameter. The wedge-shaped clamp member 41 has an I-shaped slide guide portion 414 that protrudes along a taper at a part of the outer peripheral taper portion 412, and the slide guide portion 414 is formed on the inner peripheral taper portion 421 of the ring member 42. Since the insertable dovetail groove 424 is formed, the wedge-shaped clamp member 41 is assembled so that the slide guide portion 414 can be inserted into the dovetail groove 424 and moved along the inner peripheral tapered portion 421 of the ring member 42. (See FIG. 4).

  In order to adjust the distance L <b> 1 between the first flange portion 411 and the second flange portion 422, a fastening member 43 is attached to the ring member 42. The fastening member 43 is fixed so that one end portion 431 can move along a long hole 415 formed in the first flange portion 411, and a male screw portion 432 is formed in an intermediate portion of the fastening member 43. Since it is formed in the two flange portion 422, it is screwed into the screw portion 425. With this structure, the distance L1 between the wedge-shaped clamp member 41 and the ring member 42 can be adjusted by rotating the fastening member 43, so that the wedge-shaped clamp member 41 can be expanded or contracted.

  The movable portion 5 rotates the rotation of a rotating member 51 that rotates the tube end protection member 1, a movable main body 53 that rotatably supports the rotating member 51 via a bearing 52, and a driving unit (not shown) such as an electric drill. A connecting member 54 that transmits to the member 51 is included. The rotating member 51 is provided with a plurality of protrusions 511 at predetermined intervals in the circumferential direction on the surface on which the tube end protection member 1 is mounted, and is fitted into the recess 13 of the tube end protection member 1. Therefore, the tube end protection member 1 can rotate together with the rotation member 51 (see FIG. 5). In addition, a core member 55 having an outer diameter slightly smaller than the inner diameter of the connecting pipe 2 is provided at the end of the rotating member 51 so as to straddle the inner peripheral surfaces of the connecting pipe 2 and the pipe end protecting member 1.

  The guide rod 6 is a rod-like body having a threaded portion 62 formed at one end and a seat portion 61 formed at the other end, and the male threaded portion 62 is fixed to the movable body 53. Since a guide hole 426 provided in the ring member 42 is slidably fitted in the guide portion 63 of the guide rod 6, the movable portion 5 moves along the guide hole 426 together with the guide rod 6. Can do. The elastic member 7 is interposed between the seat portion 61 and a second ring member 81 described later.

  The pressurizing means 8 has a protruding portion 427 formed on one end surface of the second flange portion 422 and a concave portion 811 having a shape complementary thereto, and is assembled so that the protruding portion 427 and the concave portion 811 are fitted. A second ring member 81. The protrusion 427 has an inclined surface 428 in which a part of the circumferential direction is gently inclined as viewed from a direction perpendicular to the paper surface. A female screw 813 is formed on the outer periphery of the second ring member 81, and a tip end portion of a handle 814 is screwed into the female screw 813. Since the second ring member 81 is formed with an arc-shaped elongated hole 812 through which the guide rod 6 can be inserted, the second ring member 81 is elongated along the guide rod 6 while changing its position relative to the ring member 42. It can rotate in the circumferential direction by the amount of the hole 812 (FIG. 6). When the second ring member 81 is rotated in the arrow B direction with respect to the ring member 42, the second ring member 81 moves along the inclined surface 428 and also moves in the tube axis direction (FIG. 7).

  A procedure for friction welding the tube end protection member 1 to the end portion of the connection tube 2 using the rotary welding tool 3 will be described. According to the rotary welding tool 3 described above, the pipe end protection member can be fusion bonded to the end of the connection pipe 2 in the steps (1) to (5).

(1) Installation process of tube end protection member The tube end protection member 1 is attached to the rotation member 51 from the opening side end of the rotary fusing tool 3. Here, the pipe end protection member 1 is mounted such that the protrusion 511 of the rotation member 51 is fitted into the recess 13, whereby the rotation of the rotation member 51 is transmitted to the tube end protection member 1.

(2) Clamping process of connecting pipe The connecting pipe 2 is fixed to the clamp part 4 as follows. First, as shown in FIG. 3, the connection pipe 2 is fixed to a work table or the like using a chain vise (not shown) or the like with the mounting allowance L2 of the clamp part 4 secured at the end. Next, the rotary welding tool 3 is externally fitted to the pipe end of the connection pipe 2 so that the end of the connection pipe 2 abuts the fusion surface 11 of the pipe end protection member 1. Next, the fastening member 43 is rotated to shorten the relative distance L1 between the ring member 42 and the wedge-shaped clamp member 41 in the tube axis direction. As a result, the wedge-shaped clamp member 41 moves along the inner peripheral tapered portion 421 of the ring member 42 and moves so that the inner diameter is reduced in a direction perpendicular to the tube axis. Similarly, the connection pipe 2 is clamped by moving a plurality of wedge-shaped clamp members 41 arranged in the circumferential direction until the inner surface 413 presses against the outer peripheral surface of the connection pipe 2. Slightly before the inner surface 413 of the wedge-shaped clamp member 41 presses the outer peripheral surface of the connection pipe 2, that is, when the clamp part 4 can move on the outer surface of the connection pipe 2 in the tube axis direction, the clamp part 4 is moved to the outer surface of the connection pipe 2. The end of the clamp 4 is brought into contact with the end of the elastic member 7 by sliding in the axial direction. At this time, the elastic member 7 is not compressed and maintains a natural length. In this way, the rotary welding tool 3 is positioned with respect to the connection pipe 2 and the connection pipe 2 is completely fixed at that position. In addition, a positioning member having a predetermined length may be detachably provided between the ring member 42 and the movable main body 53 so that the elastic member 7 is surely natural length during the clamping process.

(3) Pressurizing step The second ring member 81 is rotated by a predetermined amount in the circumferential direction with respect to the ring member 42. Then, as shown in FIG. 8, the second ring member 81 moves along the inclined surface 428 and also in the tube axis direction with respect to the ring member 42, and the elastic member 7 passes through the spacer ring 82 and the second ring member. Compressed between the end portion 81 and the seat portion 61 formed at the end portion of the guide rod 6. Since the connecting pipe 2 is fixed to the clamp portion 4 and the guide rod 6 is slidable with respect to the clamp portion 4, the biasing force of the elastic member 7 is fixed to the guide rod 6 and the guide rod 6. Is transmitted to the tube end protection member 1 via the movable portion 5, and the end surface of the connection tube 2 and the fusion surface 11 of the tube end protection member 1 are pressed against each other.

(4) Rotating Fusion Process A driving means (not shown) such as an electric drill is connected to the connecting member 54 and the rotation of the driving means is transmitted to the rotating member 51. Since the tube end protection member 1 is mounted such that the recess 13 fits into the protrusion 511 of the rotation member 51, the tube end protection member 1 rotates together with the rotation member 51. Since the pipe end protecting member 1 is rotated while the fusion surface 11 is pressed against the end face of the connecting pipe 2 by the elastic member 7, heat is generated by friction at the contact interface, and the end of the connecting pipe 2 becomes higher than the melting temperature of the resin. These resin layers (the first resin layer and the second resin layer) and the fused surface 11 of the tube end protecting member 1 are melted. At this time, since the tube end protection member 1 is pressed toward the end of the connecting tube 2, it moves in the direction of arrow D in FIG. 8 while forming a molten bead containing impurities such as dirt on the outer periphery of the interface. To do. On the other hand, since the core member 55 is inserted in the inner peripheral portion of the interface, the molten bead generated in the inner peripheral portion is the inner peripheral portion of the interface between the connection pipe 2 and the tube end protecting member 1, It is spread in the gap between. The core member 55 is formed in such a size that a predetermined gap is formed between the outer peripheral surface of the core member 55 and the inner peripheral surface of the connecting pipe 2 so that the expanded molten bead enters. If the size of the gap is smaller than 0.5 mm, the molten bead cannot enter the gap, and if it is larger than 2.0 mm, the effect of spreading the molten bead cannot be obtained. Accordingly, the gap is preferably provided with a size of 0.5 mm to 2.0 mm. Further, since the core member 55 is inserted in the inner peripheral portion of the interface, the molten resin does not flow into the inner peripheral side, and does not flow into the annular groove portion 12 formed on the fusion surface 11 of the tube end protection member 1. Inflow. When the rotating means is driven for a predetermined time and the melting of the interface is continued, the movable portion 5 is urged toward the end of the connecting pipe 2 by the urging force of the elastic member 7, so that the elastic member 7 becomes a natural length. It moves to the connecting pipe 2 side until it returns. When the elastic member 7 reaches the natural length, the rotation of the rotating means is stopped, and the second ring member 81 is further rotated by a predetermined amount in the circumferential direction. As a result, the elastic member 7 is compressed again and the interface between the tube end protection member 1 and the connection tube 2 is pressurized, and the melted interface is united and the tube end protection member 1 and the connection tube 2 are fusion bonded. .

(5) Cooling step Next, the interface is cooled until the temperature of the interface reaches room temperature while maintaining the above-mentioned pressure state. In this way, the entire interface is firmly and uniformly bonded by cooling while maintaining the pressurized state. Finally, the melt bead formed on the outer periphery of the interface is cut and removed to complete the rotary fusing operation.

  In the above friction welding procedure, (3) the elastic member 7 is compressed by a predetermined amount in the pressurizing step, and (4) the elastic member 7 is compressed again after the elastic member 7 reaches the natural length in the rotary fusing step. The pipe end protection member 1 is fused to the end portion of the connection pipe 2 by (3) compressing the elastic member 7 in the pressurizing step, and (4) the elastic member 7 is natural length in the rotary fusing step. The rotation of the pipe end protection member 1 is pressed against the end of the connection pipe 2 by the urging force of the elastic member 7 at this time, and the pipe end protection member 1 is fused to the end of the connection pipe 2. You can also According to this method, since the tube end protection member 1 is always pressed against the end of the connection tube 2 during rotation and generates heat due to friction, the contact interface can be prevented from being rapidly cooled and solidified.

(Other embodiments)
Next, another embodiment of the rotary fusing tool that is a related technique of the present invention will be described with reference to the accompanying drawings. Figure 9 is a perspective view of another rotary fusing tool is a related art of the present invention, FIG 10 is a half cross-sectional view of another rotary fusing tool is a related art of the present invention, the related art of FIG. 11 is the invention it is a schematic diagram showing a positioning operation of the movable portion definitive other rotary fusing tool is. This rotary fusing tool is characterized by the structure of the core member and the positioning structure of the movable member during the clamping process. The other parts are the same as the rotary fusing tool of FIG. Description is omitted.

  The movable part 5b of the rotary fusing tool 3b includes a rotating member 51b that rotates the tube end protecting member 1, a movable main body 53b that rotatably supports the rotating member 51b via a bearing 52, and driving means (not shown, for example, electric). It includes a connecting member 54b that transmits the rotation of the drill) to the rotating member 51b. The rotation member 51b is provided with a plurality of protrusions 511b at predetermined intervals in the circumferential direction on the surface on which the tube end protection member 1 is mounted so that the rotation member 51b fits into the recess 13 of the tube end protection member 1. Therefore, the tube end protecting member 1 can rotate with the rotating member 51b when the rotating member 51b rotates. Further, a core member 55b having an outer diameter slightly smaller than the inner diameter of the connection pipe 2 is provided at the end of the rotating member 51b so as to straddle the inner peripheral surfaces of the connection pipe 2 and the pipe end protection member 1. The core member 55b is mounted between the rotating member 51b via a bearing 56, and is provided to be rotatable relative to the rotating member 51b.

  The movable main body 53b is provided with a positioning member 57 in order to make the distance between the ring member 42 and the movable main body 53b constant so that the elastic member 7 has a natural length during the clamping process (FIG. 9, FIG. 9). 11). The positioning member 57 is provided so as to be slidable in the tube axis direction through the movable main body 53b, and a piston member 572 provided with a pressing member 571 for pressing the end surface of the ring member at one end thereof, and the other of the piston member 572 The handle crank member 573 is rotatably supported at the end of the shaft, and a connecting member (connecting rod) 574 that connects the handle crank member 573 and the movable main body 53b. The operation of the positioning member will be described with reference to FIG. In the clamping process, as shown in FIG. 11A, the piston member is pushed most into the movable portion main body 53b, and the end surface of the ring member 42 is moved by the pressing member 571 provided at the end of the piston member 572. Hold down. Thereby, it positions so that the ring member 42 and the movable main body 53b may become a predetermined space | interval. Here, the predetermined interval refers to the ring member 42 in a state in which the movement of the movable portion 5b with respect to the clamp portion 4 is restricted by the elastic member 7 and the urging force of the elastic member 7 does not act on the movable portion 5b. The space | interval with the movable main body 53b is shown. After the clamping process is completed, the handle crank member 573 is rotated clockwise about the fulcrum E. The rotational movement of the handle crank member is converted into a linear movement by a connecting member 574 pivotally supported by the movable main body 53b, and the piston member 572 moves in a direction away from the end face of the ring member 42 as the fulcrum E moves (see FIG. 11 (b), (c)). At this time, since the movable portion 5b is fixed in a state of being positioned with respect to the connection pipe 2 by the clamping process, the position with respect to the connection pipe 2 does not change even after the pressing of the ring member by the pressing member is released. By performing construction after the pressurizing step in this state, the urging force of the elastic member 7 is transmitted to the tube end protecting member 1 through the movable portion 5b, and the end surfaces of the tube end protecting member 1 and the connecting tube 2 are pressurized. Is done.

  According to the rotary welding tool 3b, the core member 55b is provided so as to be relatively rotatable with respect to the rotary member 51b. Therefore, when the pipe end protecting member 1 is rotationally welded to the connecting pipe 2, the core member is It is possible to prevent the inner surface of the connecting tube 2 from being damaged by contacting the inner surface of the connecting tube 2 while rotating. Further, since the “core member 55b” or “the molten bead between the core member 55b and the connecting pipe 2” can be prevented from rotating and contacting the inner peripheral surface of the connecting pipe 2, the connecting pipe can be prevented. There is no possibility that the inner surface of 2 is scraped off. Further, by providing the positioning member 57 that fixes the distance between the ring member 42 and the movable main body 53b at the time of the clamping process, variations in the clamping of the connecting pipe can be suppressed, and the pipe end protection member 1 is applied after the pressing process. And the dispersion | variation in the urging | biasing force of the elastic member 7 pressurized by the connection pipe 2 can be reduced. As a result, the tube end protection member 1 can be reliably rotationally fused to the end portion of the connection tube 2 with certainty.

In the above-described embodiment, the use of the rotary fusing tool 3 or 3b, which is a related technique of the present invention, describes that the connection pipe 2 is a metal-reinforced resin pipe and the pipe end protection member 1 is joined to the end thereof. However, the connecting pipe is not limited to this, and according to the rotary fusing tool which is a related technique of the present invention , for example, a resin ring can be joined to the end of a resin pipe formed in a multilayer shape.

It is a perspective view of the pipe end protection member concerning an embodiment of the invention. It is a half sectional view of a pipe end protection member concerning an embodiment of the invention. It is a half cross-sectional view of a rotary fusing tool that is a related technique of the present invention. It is a perspective view which shows the state which assembled | attached the wedge-shaped clamp member and the ring member. It is a perspective view which shows a rotation member. It is operation | movement explanatory drawing of a pressurizing means, (a) is a half sectional view which shows the state which the 2nd ring member rotated, (b) is the sectional view on the AA line of (a). It is operation | movement explanatory drawing of a pressurizing means, (a) is a half sectional view which shows the state which the 2nd ring member moved to the pipe-axis direction, rotating, (b) is CC sectional view taken on the line of (a). . It is a half sectional view showing a pressurizing process. It is a perspective view of the other rotary fusing tool which is a related technique of this invention. It is a judgment surface view of the other rotary fusing tool which is a related technique of the present invention. It is a schematic diagram of the positioning member of the other rotary welding tool which is a related technique of this invention. It is a half sectional view showing a multilayer resin pipe. It is a half section showing the state where the multilayer resin pipe was connected with the electric fusion joint. It is sectional drawing which shows a prior art example. It is sectional drawing which shows another prior art example.

Explanation of symbols

1: pipe end protection member 11: fusion surface, 12: annular groove, 13: recess, 14: protrusion 2: multilayer resin tube 21: first resin layer, 22: metal layer, 23: second resin layer 3: Rotary fusion tool 4: Clamp part 41: Wedge-shaped clamp member, 411: First flange part, 412: Peripheral taper part,
413: inner surface, 414: slide guide part, 415: long hole, 42: ring member,
421: inner peripheral taper portion, 422: second flange portion, 423: inner surface, 424: dovetail groove,
425: female thread portion, 426: guide hole, 427: protrusion, 428: inclined surface,
43: Fastening member, 431: End part, 432: Male thread part 5, 5b: Movable part 51, 51b: Rotating member, 511, 511b: Projection part, 52: Bearing, 53, 53b: Movable main body,
531: Female thread portion, 54: Connecting member, 55, 55b: Core member, 56: Bearing, 57: Positioning member, 571: Pressing member, 572: Piston member, 573: Handle crank member, 574: Connecting member 6: Guide Rod 61: Seat portion, 62: Male screw portion, 63: Guide portion 7: Elastic member 8: Pressurizing means 81: Second ring member, 811: Recess, 812: Long hole, 813: Female screw 814: Handle, 82: Spacer ring 9: Electric fusion joint 91: Electric heating coil

Claims (3)

In a tube end protection member comprising a resin ring having an end surface that contacts an end surface of a multilayer resin tube having a metal layer therein, a rotating member meshing with the other end side, and the end surfaces are fusion bonded.
An annular groove portion into which the metal layer of the multilayer resin tube enters is formed on an end surface of the resin ring, and the width of the annular groove portion is provided to be 2 to 5 times the thickness of the metal layer. A tube end protection member characterized by the above. In the pipe end protection member according to claim 1,
The depth of the annular groove is such that the metal layer does not hit the bottom of the annular groove when the tube end protection member is fused to the multilayer resin tube. . In the pipe end protection member according to claim 1 or 2,
The outer peripheral portion is provided in a tapered shape that is gently inclined toward the end opposite to the side fused to the end of the multilayer resin tube.

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