JP2006132626A - Housing type pipe joint, pipe body machining device and pipe body machining method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a pipe body from coming off from a housing type pipe joint by thinning of a machined part of the pipe body. <P>SOLUTION: An annular protrusion 6 expanded radially outside so as to enlarge the diameter is formed on a part of an end 11 of the pipe body 1, and an annular groove 7 having an inner surface shape complementary with the annular protrusion 6 of the pipe body 1 is formed on an inner peripheral surface 2a of a housing 2, and the annular protrusion 6 of the pipe body 1 is fitted to the groove 7 of the housing 2 when a pair of the housings 2 are fastened by a fastening member 4. The annular protrusion 6 is formed to be a curved shape, and thereby lowering of the mechanical strength by thinning of the annular protrusion 6 is prevented, the annular protrusion 6 of the pipe body 1 is fitted to the groove 7 of the housing 2, and the end 11 of the pair of the pipe bodies 1 can be firmly joined by the housing 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a housing-type pipe joint having excellent workability and capable of firmly connecting a pair of pipe bodies by a housing, and a pipe body processing apparatus and a pipe body processing method for forming a pipe body used in the pipe joint.

  For steel pipes used for purposes such as waterworks pipes or cold / hot water pipes for buildings, pipe joints that can be easily and reliably connected at construction sites are used. As such a pipe joint, as shown in FIG. 12, Patent Document 1 below has a flange-like flange (55a, 55b) at each end portion (59) of a pair of pipe bodies (51) to be connected. A pipe joint (50) for connecting a pipe body (51) by fastening a pair of flanges (55a, 55b) with a fastening member (54) comprising a bolt (54a) and a nut (54b) is disclosed. One tube body (51) has an annular protrusion (56) at a part of the end portion (59), and the mounting flange (55a) attached to the one tube body (51) is formed on the tube body (51). An annular groove (57) having an inner surface complementary to the annular protrusion (56) is provided on the inner peripheral surface (52a) of the base (52). When the pair of flanges (55a, 55b) are tightened by the tightening member (54), the annular protrusion (56) of the pipe body (51) is locked to the groove (57) of the base (52), and the mounting flange (55a ) Can be firmly fixed to the end portion (59) of the pipe body (51) to connect the pair of pipe bodies (51). FIG. 13 shows a pipe joint (50) in which annular projections (56) are formed on both pipe bodies (51) and mounting flanges (55a, 55b) are attached to both ends of the pipe body (51).

  However, in the structure of these pipe joints (50), since the flanges (55a, 55b) are formed along the outer peripheral surface (51a) of the pipe end (59) of the pipe body (51), as shown in FIG. As the pipe diameter of the pipe body (51) is increased, the thickness of the flanges (55a, 55b) is increased and the outer diameter is also increased, so that the weight of the entire pipe joint (50) is increased. . The increase in weight is caused by deterioration in workability of assembling or assembling. Further, normally, four to eight bolts (54a) and nuts (54b) are required to connect the pair of flanges (55a, 55b), but the pipe body (51) is an elbow type as shown in FIG. In the case of the mold, the weight is remarkably increased because the bolt (54a) and the nut (54b) are required twice or three times as much. Since the number of construction man-hours required for tightening also increases, there has been a difficulty in increasing the cost of the entire piping work including parts costs.

  Moreover, in the conventional pipe joint (50) disclosed in Patent Document 1, an annular protrusion (56) is formed on the pipe body (51) by a pipe expanding method. As shown in FIG. 15, the pipe expansion device (60) used for the pipe expansion processing method includes a main shaft (62), and a moving device that holds one end of the main shaft (62) and moves the main shaft (62) in the axial direction. 61) and a fixing device (63) attached to the moving device (61). The fixing device (63) fixes the flange (55a) having the groove (57) formed on the inner peripheral surface (52a) in a state where the main shaft (62) is inserted into the base (52) of the flange (55a). The main shaft (62) has a moving wall (64) formed by expanding a part of the main shaft (62), and the fixing device (63) opposite to the moving wall (64) and the moving wall (64). And a rubber tube expansion member (66) formed between the formed fixed shaft (65).

  When the end (59) of the pipe body (51) is fitted to the other end of the main shaft (62), and the machining shaft (62) is moved toward the device by the moving device (61), as shown in FIG. The distance between the moving wall (64) and the fixed shaft (65) is reduced, and the pipe expansion member (66) bulges radially outward, and a part of the end (59) of the pipe body (51) is seen from the inside. Press to expand diameter. The end (59) of the pipe body (51) expanded in diameter by the pipe expansion member (66) abuts on the groove (57) of the flange (55a) fixed by the fixing device (63), and the pipe expansion member (66 ) And the groove (57) of the flange (55a). An annular projection (56) having an outer surface complementary to the groove (57) of the flange (55a) can be formed on a part of the end (59) of the tube (51).

  In Patent Document 1 in which the annular protrusion (56) is formed on the pipe body (51) by the pipe expansion processing method, the pipe body (51) is limited to a stainless steel pipe excellent in strength, and is pressed by a rubber pipe expansion member (66). The stainless steel pipe is formed as thin as possible. Therefore, in this pipe expansion processing method, processing with a thin stainless steel pipe having a wall thickness of 2 mm or less is limited due to its ability. That is, it is difficult to apply the pipe expanding method to pipes such as a 150 Su stainless steel pipe or a thick stainless steel pipe and a carbon steel pipe for piping that have a thickness of 3 mm or more even with a thin stainless steel pipe. The pipe expansion device (60) has poor workability because the rubber pipe expansion member (66) having the same diameter as the inner diameter of the pipe body (51) and the main shaft (62) on which the pipe expansion member (66) is mounted are heavy. In addition, since it becomes a dedicated facility for forming the annular protrusion (56) and cannot be diverted to other processing, there is a disadvantage that the operating rate of the facility is low.

  On the other hand, as shown in FIG. 17, the following Patent Document 2 includes a pair of housings (72) having a semicircular cross section that respectively form annular cavities (82) on the inner peripheral surface (72 a), and a pair of The gasket (73) disposed in the hollow portion (82) of the housing (72) and the pair of housings (72) disposed across the pair of pipe bodies (71) to be coupled are in a direction approaching each other. Housing-type pipe joint (70) comprising a bolt (74a) and a tightening member (74) consisting of a nut (74b) that presses the gasket (73) against the ends (81) of the pair of pipe bodies (71) ) Is disclosed. Patent Document 2 includes an annular diameter-reduced portion (76) in a part of an end portion (81) of a pipe body (71) and an annular claw portion (77) on an inner peripheral surface (72a) of a housing (72). The pair of housings (72) are fastened by the fastening members (74), and the claw portions (77) of the housing (72) are locked to the annular reduced diameter portion (76) of the pipe body (71). Therefore, according to the structure of the pipe body and the housing-type pipe joint disclosed in Patent Document 2, the pipe body (71) can be firmly connected by the pair of housings (72), so that the pair of pipe bodies (51 The pipe joint can be reduced in size and weight compared to the pipe joint of Patent Document 1 described above having flanges (55a, 55b) at each end portion (59).

Japanese Patent No. 3433248 (FIG. 1) JP-A-7-190261 (FIG. 3) Japanese Utility Model Publication No. 6-42337 (FIG. 1)

  However, in the above housing-type pipe joint, the annular reduced diameter portion (76) of the pipe body (71) which is thinned and has low mechanical strength is deformed by high pressure due to the internal fluid of the pipe body (71), and the housing (72 There is a risk that the claw portion (77) of the pipe joint may come off from the annular diameter-reduced portion (76) of the pipe body (71) and the pipe joint may be removed.

  In the housing type pipe joint, the annular reduced diameter portion (76) is formed at the end portion (81) of the pipe body (71) by a roll grooving method. As the roll grooving method, as shown in FIG. 18, the above-mentioned Patent Document 3 discloses a frame (90), a main shaft (91) supported by the frame (90), and a support rotatably attached to the main shaft (91). A roller (92), a driving device (not shown) for rotating the support roller (92), a moving arm (93) attached to the frame (90) so as to be movable forward and backward with respect to the support roller (92), and movement Disclosed is a tube processing apparatus (80) comprising a moving device (not shown) for moving the arm (93) and a pressing roller (94) rotatably attached to the moving arm (93). The support roller (92) has a support surface (92a) composed of an annular recess (95) and a support flat part (96), and the pressure roller (94) is a press provided with an annular projection (97). Surface (94a).

  The conventional housing-type pipe joint shown in FIG. 17 is formed by hooking the claw portion (77) of the housing (72) onto the side wall (76a) in the annular reduced diameter portion (76) of the pipe body (71). In order to prevent the tube (71) from slipping out of the tube, the annular reduced diameter portion (76) of the tube (71) has to be recessed substantially vertically. Therefore, the concave portion (95) of the support roller (92) is formed by a flat bottom surface (95a) and a substantially vertical side surface (95b), and the convex portion (97) of the pressing roller (94) is a flat top surface ( 97a) and substantially vertical side surfaces (97b). As shown in FIG. 19, the end portion (81) of the tube (71) externally fitted to the support roller (92) is sandwiched between the support roller (92) and the pressure roller (94), and the pressure roller (94) is pressed toward the support roller (92) and the support roller (92) is rotated to reduce the annular diameter of the tube (71) at the end (81) at right angles or almost right angles. Part (76) was formed. Therefore, the annular diameter-reduced portion (76) of the tube body (71) is a tube wall (part or corner pressed against the convex portion (97) of the pressing roller (94) is partially pulled to reduce the wall thickness ( 78) thinning occurred and the mechanical strength decreased.

  For example, when a high pressure of about 6 MPa is applied to a thin stainless steel pipe having a diameter of 100 mm or more, the annular reduced diameter portion (76) of the pipe body (71) has a smaller section modulus and is thinner than the main body of the pipe body (71). Since it was formed, the rigidity was insufficient, and the annular diameter-reduced portion (76) and the surrounding pipe wall (78) were deformed by the axial load, and the tube was removed. Moreover, in the structure of the housing type pipe joint of Patent Document 2, the contact surface of the claw portion (77) of the housing (72) is small with respect to the inner surface of the annular reduced diameter portion (76) of the tube body (71), and the tube body (71) Or the movement of the pipe joint could not be prevented completely. Furthermore, a pipe joint that is provided with an annular diameter-reduced portion (76) that protrudes to the inside of the pipe body and serves as a flow resistance of the internal fluid reduces the effective cross-sectional area of the internal fluid that flows through the pipe body (71), particularly the pipe diameter. In the connection portion of the small tube (71), the smooth flow of the internal fluid is hindered by the annular reduced diameter portion (76).

  Accordingly, an object of the present invention is to provide a housing-type pipe joint that can prevent the pipe from being removed and that can firmly and reliably connect the pair of pipes by the housing. The present invention also provides a tube processing apparatus and a tube processing method in which the tube type is not limited to a thin stainless steel tube, and an annular protrusion can be formed at the end of the tube without reducing the mechanical strength of the tube. The purpose is to do.

  The housing-type pipe joint of the present invention includes a pair of housings (2) having a semicircular cross section that respectively form an annular cavity (12) on the inner peripheral surface (2a), and a cavity of the pair of housings (2). (12) The pair of pipes by pressing the seal member (3) arranged in the inside and the pair of housings (2) arranged across the pair of pipes (1) to be connected in a direction approaching each other A tightening member (4) for pressing the seal member (3) is provided at the end (11) of (1). In addition, the housing type pipe joint is formed with an annular protrusion (6) that bulges radially outward and expands in a part of the end (11) of the pipe body (1), so that the annular shape of the pipe body (1) is formed. An annular groove (7) having an inner surface complementary to the protrusion (6) is formed in the inner peripheral surface (2a) of the housing (2), and the pair of housings (2) are tightened by the tightening member (4). At this time, the annular protrusion (6) of the pipe body (1) is engaged with the groove (7) of the housing (2). When the pair of housings (1) are tightened by the fastening members (4) and the groove (7) formed on the inner peripheral surface (2a) of the housing (2) is locked to the annular protrusion (6) of the tube body (1). The end portions (11) of the pair of pipe bodies (1) can be firmly coupled by the housing (2). In this case, the annular protrusion (6) of the tubular body (1) is brought into contact with the groove (7) of the tubular body (1) with a large pressing force by tightening of the tightening member (4), so that the withdrawal force or rotational force is not increased. Even if added to the tube (1), the axial movement or rotation of the tube (1) relative to the housing (2) is prevented, and the annular protrusion (6) of the tube (1) is formed in the groove of the housing (1). (7) is securely held within. Further, the annular protrusion (6) that bulges outside the tubular body (1) is difficult to receive the pressure of the internal fluid acting in the axial direction of the tubular body (1), so the annular protrusion (6) is not deformed and the housing It is possible to prevent (2) from detaching from the pipe body (1) and removing the pipe joint. Further, unlike the conventional pipe joint that protrudes inside the pipe body and provides a reduced diameter portion that becomes the flow resistance of the internal fluid, the annular protrusion (6) that bulges outside the pipe body (1) 1) Since the effective cross-sectional area of the internal fluid flowing inside is not reduced, the internal fluid smoothly flows even at the connection portion of the pipe body (1).

  The tubular body processing apparatus of the present invention includes a frame (30), a main surface (31) supported by the frame (30), a support surface (32a) including an annular convex portion (35) and a support flat portion (36). And a support roller (32) rotatably attached to the main shaft (31), a drive device for rotating the support roller (32), and a frame (30) that can be moved forward and backward with respect to the support roller (32). An attached moving arm (33), a moving device (41) for moving the moving arm (33), and a pressing surface (34a) provided with an annular recess (37) and a pressing flat portion (38). And a pressing roller (34) rotatably attached to the moving arm (33). The convex portion (35) of the support roller (32) is inclined outward in the opposite direction to the annular first convex inclined portion (35b) inclined outward and the first convex inclined portion (35b). An annular second convex inclined portion (35c), and a top portion (35a) formed between the first convex inclined portion (35b) and the second convex inclined portion (35c). The concave portion (37) of the pressing roller (34) includes an annular first concave inclined portion (37b) inclined inward and a second concave inclined portion (37b) inclined inward in the opposite direction. It has a concave inclined part (37c) and a bottom part (37a) formed between the first concave inclined part (37b) and the second concave inclined part (37c). The end (11) of the tube (1) is fitted on the support roller (32), and the end (11) of the tube (1) is interposed between the support roller (32) and the pressing roller (34) by the moving device. ) And rotating the support roller (32) while pressing the pressure roller (34) toward the support roller (32), the convex portion (35) of the support roller (32) becomes the pressure roller (34). Can be formed continuously in the circumferential direction of the tubular body (1), and is fitted into the concave portion (37) of the tubular body (1) and projects outwardly at the end (11) of the tubular body (1). . Since the annular projection (6) is formed in a curved shape, it is possible to prevent thinning of the pipe wall (8) that is partially pulled and thinned, and to prevent other tubes (1) from forming the annular projection (6). The annular protrusion (6) can be held to the same thickness as the tube wall (8). Further, the surface of the end portion (11) pressed by the pressing roller (34) is smoothed, and the seal member (3) and the pipe body (1) disposed at the end portion (11) having a reduced surface roughness. Adhesion with the end (11) is improved, and water leakage of the pipe joint can be prevented well.

  The tubular body processing method of the present invention includes a support roller (32) having a support surface (32a) including an annular convex portion (35) and a support flat portion (36), and an end portion (11) of the tubular body (1). A pressing roller (34) having a pressing surface (34a) including an annular fitting step, an annular concave portion (37), and a pressing flat portion (38) via an end portion (11) of the tubular body (1). Between the step of pressing toward the support roller (32), the step of rotating the support roller (32), and the convex portion (35) of the support roller (32) and the concave portion (37) of the pressure roller (34). By holding the end (11) of the tube (1) and rotating the support roller (32), an annular protrusion (6) protruding outward from the end (11) of the tube (1) is formed. And (1) continuously forming in the circumferential direction.

  According to the housing-type pipe joint of the present invention, a pair of pipe bodies can be connected firmly and securely, and can be applied to high pressure piping with high reliability. Further, according to the tubular body processing apparatus and the tubular body processing method of the present invention, the tube type is not limited to the thin stainless steel pipe, and the tubular body is prevented from being thinned, and the tubular body is annular without reducing the mechanical strength. A protrusion can be formed.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a housing type pipe joint, a pipe body processing apparatus and a pipe body processing method according to the present invention will be described below with reference to FIGS.

  As shown in FIG. 1, a housing-type pipe joint according to the present invention has a pair of housings (2) having semicircular cross sections each forming an annular cavity (12) on the inner peripheral surface (2a), as in the prior art. ), A seal member (3) disposed in the cavity (12) of the pair of housings (2), and a pair of housings (2) disposed across the pair of pipe bodies (1) to be coupled. And a tightening member (4) for pressing in directions approaching each other. For the housing (2), a material having sufficient rigidity against the pulling force and bending stress applied to the pipe joint is appropriately selected, and it is preferably made of cast iron or the like. The housing (2) has a pair of joints (9) that bisect the housing (2) in the axial direction, and a pair of flanges (5) protruding from the outer peripheral surface (2b) of the housing (2) in the vicinity of the joint (9). ) Is provided. In addition, each housing (2) is formed in an arch shape in the axial direction, and is disposed over the opposite end portions (11) of the connecting pipe bodies (1).

  As the seal member (3), for example, a known gasket or packing formed of a rubber material such as flexible or elastic EPR (ethylene propylene rubber) is applied. When the sealing member (3) presses the pair of housings (2) in a direction approaching each other by the tightening member (4), the pair of tubular bodies (1) is formed by the housing (2) in the cavity (12). The end portion (11) of the pipe body (1) is pressed against the end portion (11) of the pipe body (1) to prevent water leakage of the pipe joint. According to the housing type pipe joint of the present embodiment, the sealing member (3) is sealed by the self-sealing gasket shown in FIG. 1 that is sealed by the pressure of the fluid to be sealed or by tightening by the housing (2). Any of the compression gaskets shown in FIG. The bolt (4a) and the nut (4b) are used for the tightening member (4) as in the prior art. Although depending on the tube diameter, the pair of housings (2) can be sufficiently tightened with 2 to 4 bolts (4a) and nuts (4b).

  The tubular body (1) can be a general steel pipe or stainless steel pipe that has been conventionally applied to piping. As shown in FIGS. 1 to 4, an annular protrusion (6) that swells radially outward and expands is formed on a part of the end (11) of the tubular body (1). The annular protrusion (6) is formed with a curved shape without an acute angle, and has substantially the same thickness as the tube wall (8) of the tubular body (1) that does not form the annular protrusion (6). An annular groove (7) having an inner surface complementary to the annular protrusion (6) of the tube (1) is formed on the inner peripheral surface (2a) of the housing (2). The annular protrusion (6) shown in FIG. 1 includes a first inclined portion (6b) that protrudes radially outward from the outer peripheral surface (1a) of the end portion (11), and a first inclined portion (6b). Is a second inclined portion (6c) projecting radially outward at a steeper angle than the first inclined portion (6b), and the first inclined portion (6b) and the second inclined portion (6c). ) And an uppermost portion (6a) formed therebetween. With respect to the annular protrusion (6), the annular groove (7) of the housing (2) is inclined in the same direction as the first inclined part (6b) of the annular protrusion (6) from the recessed bottom (7a). And a second inclined portion inclined in the same direction as the second inclined portion (6c) of the annular protrusion (6) from the bottom (7a) to the first inclined portion (7b). (7c)

  The pair of housings (2) are tightened by the fastening member (4), and the annular protrusion (6) of the pipe body (1) is locked to the groove (7) of the housing (2), so that the pair of pipe bodies (1) Can be connected. When the annular protrusion (6) of the tubular body (1) and the groove (7) of the housing (2) are engaged, as shown in FIGS. 1 to 4, the first inclined portion ( 6b) contacts the first inclined portion (7b) of the groove portion (7), and the second inclined portion (6c) of the annular protrusion (6) contacts the second inclined portion (7c) of the groove portion (7). It is preferable. Furthermore, as shown in FIGS. 1, 2, and 4, it is more preferable that the topmost part (6a) of the annular protrusion (6) abuts on the second inclined part (7c) of the groove part (7).

  The pair of housings (1) are tightened by the fastening member (4), and the groove (7) formed on the inner peripheral surface (2a) of the housing (2) is locked to the annular protrusion (6) of the tube (1). Then, the end portions (11) of the pair of pipe bodies (1) can be firmly coupled by the housing (2). In this case, the annular protrusion (6) of the tubular body (1) is brought into contact with the groove (7) of the tubular body (1) with a large pressing force by tightening of the tightening member (4), so that the withdrawal force or rotational force is not increased. Even if added to the tube (1), the axial movement or rotation of the tube (1) relative to the housing (2) is prevented, and the annular protrusion (6) of the tube (1) is formed in the groove of the housing (1). (7) is securely held within. Since the annular protrusion (6) of the tubular body (1) is engaged with the annular groove (7) having an inner surface complementary to the annular protrusion (6), compared with the conventional housing-type pipe joint shown in FIG. A highly reliable ability to prevent the tube from coming off can be obtained. Further, the annular protrusion (6) that bulges outside the tubular body (1) is difficult to receive the pressure of the internal fluid acting in the axial direction of the tubular body (1), so the annular protrusion (6) is not deformed and the housing It is possible to prevent (2) from detaching from the pipe body (1) and removing the pipe joint. Further, unlike the conventional pipe joint that protrudes inside the pipe body and provides a reduced diameter portion that becomes the flow resistance of the internal fluid, the annular protrusion (6) that bulges outside the pipe body (1) 1) Since the effective cross-sectional area of the internal fluid flowing inside is not reduced, the internal fluid smoothly flows even at the connection portion of the pipe body (1).

  When connecting the pair of pipes (1) by the housing-type pipe joint of the present embodiment, first, in a state where the seal member (3) is disposed in the cavity (12) of the housing (2), the housing ( The pair of joints (9) of 2) are combined, and the housing (2) is tightened and temporarily assembled by, for example, two sets of bolts (4a) and nuts (4b). Next, the pipe bodies (1) are respectively inserted from the openings formed at both ends of the housing (2) in combination, and the housing (2) is further tightened with bolts (4a) and nuts (4b) to form a pair of pipes. The body (1) can be connected. The housing (2) disposed across the pair of tube bodies (1) has high strength against bending stress generated between the connected tube bodies (1). Moreover, the conventional pipe joint (50) shown in FIG. 12 which connects the annular flange (55a, 55b) formed in the end part (59) of the pipe body (51) by a plurality of bolts (54a) and nuts (54b). Compared to the above, the weight and cost can be reduced, and the mounting process can be simplified. The connecting procedure of the pipe body (1) is not limited to the above, and after disposing the seal member (3) between the pair of pipe bodies (1), the housing (2) is attached to the end of the pipe body (1) ( 11) It may be covered and tightened with bolts (4a) and nuts (4b).

  As shown in FIGS. 1 to 3, the end (11) of the tube (1) has an annular protrusion (6) having an enlarged diameter and another tube (1) that does not form the ring protrusion (6). The pipe end (13) has the same outer diameter as the pipe wall (8), and a seal member (3) such as a gasket is attached to the pipe end (13). In the conventional housing type pipe joint, in order to prevent water leakage of the pipe joint, the inner diameter of the gasket is formed to be remarkably smaller than the outer diameter of the pipe body. Therefore, at the time of attaching the pipe joint, first, it was attached to one end portion of the pipe body to be connected by forcibly expanding the inner diameter of the gasket, and the gasket was slid between the pair of pipe bodies. However, in the present embodiment, the outer diameter of the pipe end (13) of the pipe body (1) and the inner diameter of the seal member (3) are made substantially the same, and the pipe end (13) of the pipe body (1) is moved to. By adopting a self-sealing gasket shape with an inner diameter that is easy to mount, workability can be greatly improved. The sealing member (3) has a structure capable of securing a sufficient sealing surface pressure by tightening 2 to 4 locations of the flange (5) with bolts (4a) and nuts (4b). In the self-sealing gasket shown in FIG. 1, when the housing (2) is covered with the tubular body (1) and the pair of housings (2) are tightened by the fastening member (4), the initial surface pressure of the gasket is 2 to 2. The structure is 20%, preferably 5-10%. In addition, the compression type gasket shown in FIG. 2 has a structure in which the compression ratio is 10 to 50%, preferably about 25 to 35%.

  According to the shape of the annular protrusion (6) shown in FIG. 1, when the pipe body (1) is inserted into the pair of housings (2) in the temporarily assembled state, the first inclined portion (6b ) Can be smoothly inserted into the housing (2) in a temporarily assembled state in which the housing is slidably fitted into the inner peripheral surface (2a) of the housing (2). In addition, when the pipe body (1) is connected by the housing (2), the second inclined portion (6c) that inclines sharply contacts the inner peripheral surface (2a) of the housing (2) to serve as a stopper. The tube (1) is prevented from coming out of the housing (2). As shown in FIG. 3, the annular protrusion (6) is formed in a mountain shape in which the first inclined portion (6b) and the second inclined portion (6c) are substantially symmetrical with respect to the topmost portion (6a). Also good. However, the housing-type pipe joint shown in FIG. 1 having the annular protrusion (6) in which the first inclined portion (6b) and the second inclined portion (6c) are formed asymmetrically has the first inclined portion (6b). 3 and more than the housing-type pipe joint shown in FIG. 3 having the annular protrusion (6) in which the second inclined portion (6c) is symmetrically formed. This has been confirmed by the inventors' experiments.

  When forming the annular protrusion (6) of the tubular body (1) shown in FIGS. 1 to 4, the tubular body processing apparatus and the tubular body processing method of the present embodiment shown in FIGS. 5 to 7 and 9 are applied. can do. The housing-type pipe joint of the present invention may be assembled by forming the annular protrusion (6) on the pipe body (1) by another apparatus or method. An annular groove (7) provided on the inner peripheral surface (2a) of the housing (2) is formed together with the housing (2) during casting.

  As shown in FIG. 5, the tube processing apparatus (40) includes a frame (30), a main shaft (31) supported by the frame (30), and a support roller (rotatably attached to the main shaft (31)). 32), a driving device (not shown) for rotating the support roller (32), a moving arm (33) attached to the frame (30) to be movable forward and backward with respect to the supporting roller (32), and a moving arm ( 33) and a pressing roller (34) rotatably attached to the moving arm (33). The frame (30) is made of, for example, a metal such as a stainless alloy, and rotatably supports one end of the main shaft (31) by a bearing (not shown). The moving arm (33) has one end pivotally attached to the frame (30) and is swung by the piston (41a) of the moving device (41) connected to the other end. The moving device (41) moves the pressing roller (34) attached to the other end of the moving arm (33) in the direction approaching the support roller (32) by the piston (41a).

  Unlike the conventional tube processing apparatus (80) shown in FIGS. 18 and 19, the tube processing apparatus (40) of the present embodiment shown in FIG. 6 is convex on the support surface (32a) of the support roller (32). A portion (35) is formed, and a concave portion (37) is formed on the pressing surface (34a) of the pressing roller (34). As shown in FIG. 6, the support roller (32) formed of a material such as steel is fixed to the other end of the main shaft (31), and is composed of an annular convex portion (35) and a support flat portion (36). It has a surface (32a). The pressing roller (34) formed of the same material as the support roller (32) is pivotally attached to the other end of the moving arm (33), and is provided with an annular recess (37) and a pressing flat portion (38). Having a pressed surface (34a). The convex portion (35) of the support roller (32) is inclined outward in the opposite direction to the annular first convex inclined portion (35b) inclined outward and the first convex inclined portion (35b). An annular second convex inclined portion (35c), and a top portion (35a) formed between the first convex inclined portion (35b) and the second convex inclined portion (35c). The concave portion (37) of the pressing roller (34) has an annular first concave inclined portion (37b) inclined inward and a first concave inclined portion (37b) inclined inward in the opposite direction. Two concave inclined portions (37c), and a bottom portion (37a) formed between the first concave inclined portion (37b) and the second concave inclined portion (37c). In the present embodiment, the first concave inclined portion (37b) of the pressing roller (34) is inclined inward in a complementary shape with the first convex inclined portion (35b) of the support roller (32), and The second concave inclined portion (37c) is inwardly inclined in a complementary shape to the second convex inclined portion (35c) of the support roller (32), and the bottom portion (37a) is the top portion of the support roller (35b) ( Complementary shape to 35a).

  The tube (1) is externally fitted to the support roller (32) while the end (11) is supported by the support device (42). As shown in FIG. 7, when the pressing roller (34) is moved toward the support roller (32) by the moving device and pressed, the end (11) of the tube (1) is connected to the support roller (32). It is sandwiched between the pressing roller (34). At this time, the convex portion (35) of the support roller (32) is fitted into the concave portion (37) of the pressing roller (34), and by rotating the support roller (32), as shown in FIG. By drawing, an annular protrusion (6) projecting outward can be continuously formed in the circumferential direction of the tube (1) at the end (11) of the tube (1). According to the combination of the supporting roller (32) and the pressing roller (34) shown in FIGS. 6 and 7, the annular protrusion (6) is formed on the tube wall (8) of the tubular body (1) that does not form the annular protrusion (6). ) And a curved shape. Since the annular protrusion (6) formed in a curved shape is pressed into the groove (7) of the pressing roller (34) without difficulty, a thin part is not formed in a part of the annular protrusion (6), and the tubular body The mechanical strength of (1) does not decrease. The pipe body processing device (40) prevents the thinning of the pipe wall (8) that is partially pulled and thins, and the pipe wall of the other pipe body (1) that does not form the annular protrusion (6) ( The annular protrusion (6) can be held with substantially the same thickness as 8).

  The housing-type pipe joint shown in FIGS. 1 to 4 can be assembled using the pipe body (1) in which the annular protrusion (6) is formed at the end (11) by the pipe body processing apparatus (40). The outer peripheral surface (1a) of the end (11) of the tubular body (1) on which the annular protrusion (6) is formed by the tubular body processing apparatus (40) is connected to the other outer peripheral surface (1a) of the tubular body (1). On the other hand, it has a small surface roughness. The pipe body (1) is formed by smoothing the surface of the end portion (11) pressed by the pressing roller (34) and the sealing member (3) disposed at the end portion (11) having a reduced surface roughness. Adhesion with the end (11) of the body (1) is improved and water leakage of the pipe joint can be prevented well. In the conventional tube processing apparatus (80) shown in FIG. 19, only the convex portion (97) of the pressing surface (94a) of the pressing roller (94) and a part of the side surface adjacent to the convex portion (97) are tube ( 71), in the tubular body processing apparatus (40) of the present embodiment shown in FIG. 7, the pressing roller (34) presses against the entire outer peripheral surface excluding the recess (37). Since the flat portion (38) is formed, the outer surface (1a) of the end portion (11) of the tubular body (1) can be pressed by the pressing flat portion (38) to reduce the surface roughness.

  When forming the annular protrusion (6) on the tubular body (1), first, the tube is placed on the support roller (32) having the support surface (32a) including the annular convex portion (35) and the support flat portion (36). The end (11) of the body (1) is externally fitted. As shown in FIGS. 5 and 6, in the present embodiment, the tubular body (1) is in a state where a part of the inner peripheral surface (1a) is supported by the support surface (32a) of the support roller (32). And is fitted onto the support roller (32). Next, a pressing roller (34) having a pressing surface (34a) including an annular recess (37) and a pressing flat portion (38) is attached to the support roller (32 through the end (11) of the tube (1). ) The support roller (32) is rotated by the driving device before or after the end portion (11) of the tube body (1) is pressed by the pressing roller (34). The end (11) of the tube (1) is wound in the circumferential direction between the convex part (35) of the support roller (32) and the concave part (37) of the pressing roller (34), and the end part (11) is annular. A protrusion (6) can be formed.

  When the pressure roller (34) is moved toward the support roller (32) and pressed by the moving device (41), the tube (1) is first the top of the convex portion (35) of the support roller (32) ( While being supported by 35a), it is pressed by the pressing flat portion (38) of the concave portion (37) of the pressing roller (34). Next, the pressure roller (34) is pressed flat while being supported by the top portion (35a), the first convex inclined portion (35b) and the second convex inclined portion (35c) of the support roller (32). It is pressed by the part (38), the first concave inclined part (37b) and the second concave inclined part (37c). Finally, the entire pressing surface (34a) including the bottom (37a) of the concave portion (37) of the pressing roller (34) is pressed to form the annular protrusion (6) on the tube (1). As shown in FIGS. 6 to 8, a tubular body is sandwiched between the first convex inclined portion (35 b) of the support roller (32) and the first concave inclined portion (37 b) of the pressing roller (34). The second inclined portion (6c) is formed in 1) and is sandwiched between the second convex inclined portion (35c) of the support roller (32) and the second concave inclined portion (37c) of the pressing roller (34). As a result, a first inclined portion (6b) is formed in the tube body (1), and is sandwiched between the top portion (35a) of the support roller (32) and the bottom portion (37a) of the pressing roller (34). ) Is formed with the top (6a).

  As shown in FIG. 9, the first convex inclined portion (35b) and the second convex inclined portion (35c) of the support roller (32) and the first concave inclined portion (37b) of the pressing roller (34). And the second concave inclined part (37c) are formed at different inclination angles, and as shown in FIG. 10, the projecting top part (6a) gradually moves toward the end part (11) of the tubular body (1). An annular projection (6) having a first inclined portion (6b) inclined inward and a second inclined portion (6c) inclined steeply from the topmost portion (6a) relative to the first inclined portion (6b). ) May be formed on the tube (1). Further, by deforming the shape of the convex portion (35) of the support roller (32) and the concave portion (37) of the pressing roller (34), as shown in FIG. 11, an annular protrusion having a flat topmost portion (6a). (6) may be formed on the tube (1). The shapes of the convex portion (35) of the support roller (32) and the concave portion (37) of the pressing roller (34) can be appropriately changed. An annular projection (6) having an excellent ability to prevent detachment by forming the tubular body (1) of the convex portion (35) of the support roller (32) and the concave portion (37) of the pressing roller (34) into an optimal shape. Is formed into the tube (1).

  The tubular body processing apparatus (40) can use the existing tubular body processing apparatus (80) except for the support roller (32) and the pressing roller (34). The supporting roller (92) having the concave portion (95) of the existing tube processing apparatus (80) is replaced with the supporting roller (32) having the convex portion (35) of the present invention, and the pressing roller having the convex portion (97). By replacing (94) with the pressing roller (34) having the recess (37), the annular protrusion (6) can be easily and satisfactorily formed on the tube (1). According to the experiment of the present inventor, the tubular body processing apparatus (40) of the present embodiment has also provided an annular projection (6) on a thin stainless steel pipe having a thickness of 3 mm or more, a thick stainless steel pipe, and a carbon steel pipe for piping. ) Could be formed. Moreover, the thinning of the processed part of the tubular body that occurred during the conventional roll grooving method did not occur. In the tubular body processing apparatus (40), since the work process and the construction method at the site are the same as the conventional construction method with a track record, the worker can work well. In addition, since the existing tube processing apparatus (80) can be used, no new capital investment is required, which contributes to effective utilization of management resources. In the conventional housing-type pipe joint shown in FIG. 17, the annular reduced diameter portion (76) of the pipe body (71) which is thinned and has low mechanical strength is deformed by high pressure due to the internal fluid of the pipe body (71), There was a problem that the pipe joint was removed from the annular reduced diameter part (76) of the pipe body (71) because the claw part (77) of the housing (72) was removed, but the ring formed by the pipe body processing device (40) The housing-type pipe joint shown in FIGS. 1 to 4 having the protrusion (6) can prevent the annular protrusion (6) from being thinned, and the pipe (1) can be removed from the housing (2) even if the internal fluid is high pressure. Can be prevented.

  The present invention can be suitably applied to pipe joints for pipes that require high reliability, such as high-pressure pipes.

Partial sectional view of a housing-type pipe joint according to the present invention 1 is a partial cross-sectional view of the housing-type pipe joint shown in FIG. 1 is a partial cross-sectional view of the housing-type pipe joint of FIG. 1 is a partial cross-sectional view of the housing type pipe joint of FIG. 1 applied to an elbow type pipe body. Front view of a tube processing apparatus according to the present invention Side view of support roller and pressure roller having inclined surfaces of same angle 6 is a side view of the supporting roller and the pressing roller in FIG. 6 in which the pressing roller is pressed against the tubular body. FIG. 7 is a plan view of a tubular body in which an annular protrusion is formed. Side view of support roller and pressure roller having inclined surfaces of different angles FIG. 9 is a plan view of a tubular body in which an annular protrusion is formed. Plan view of a tubular body formed with an annular projection having a flat top portion Partial sectional view of a conventional pipe joint having an annular projection on one pipe body Partial sectional view of a conventional pipe joint with annular projections on both pipes Partial sectional view of a conventional elbow-type pipe fitting Sectional view of a conventional tube expansion device Sectional view of the tube expansion device of FIG. 15 in which an annular protrusion is formed on the tube body Partial sectional view of a conventional housing type pipe joint Side view of conventional support roller and pressure roller 18 is a side view of the supporting roller and the pressing roller in FIG. 18 in which the pressing roller is pressed against the tubular body.

Explanation of symbols

  (1) ・ ・ Tube, (1a) ・ ・ Outer surface, (2) ・ Housing, (2a) ・ ・ Inner surface, (3) ・ Seal member, (4) ・ Tightening member, ( 6) ・ ・ annular protrusion, (6a) ・ ・ the topmost part, (6b) ・ ・ first inclined part, (6c) ・ ・ second inclined part, (7) ・ ・ groove, (8) ・ ・ pipe Wall, (11) ・ ・ End, (12) ・ ・ Cavity, (30) ・ Frame, (31) ・ Main shaft, (32) ・ ・ Support roller, (32a) ・ ・ Support surface, (33 ) ・ ・ Moving arm, (34) ・ ・ Pressing roller, (34a) ・ ・ Pressing surface, (35) ・ ・ Convex, (35a) ・ ・ Top, (35b) ・ ・ First convex inclined part, (35c) ・ ・ Second convex slope, (36) ・ ・ Support flat part, (37) ・ ・ Recess, (37a) ・ ・ Bottom part, (37b) ・ ・ First concave slope, (37c ) ・ ・ Second concave inclined part, (38) ・ ・ Pressing flat part, (39) ・ ・ One end, (41) ・ ・ Moving device,

Claims (8)

A pair of housings each having a semicircular cross section forming an annular cavity on the inner peripheral surface, a seal member disposed in the cavity of the pair of housings, and a pair of tubes to be connected In a housing-type pipe joint provided with a fastening member that presses a pair of housings in a direction approaching each other and presses a seal member to the ends of the pair of tubular bodies,
Forming an annular protrusion that bulges radially outward and expands in a part of the end of the tubular body,
Forming an annular groove having an inner surface complementary to the annular projection of the tubular body on the inner peripheral surface of the housing;
A housing-type pipe joint characterized in that, when a pair of housings are tightened by a tightening member, an annular projection of a tubular body is locked to a groove portion of the housing.   2. The housing-type pipe joint according to claim 1, wherein the annular protrusion formed by the curved shape has substantially the same thickness as the tube wall of the tubular body not forming the annular protrusion.   The annular protrusion of the tubular body has a first inclined portion that protrudes radially outward from the outer peripheral surface of the end portion and is inclined in a direction opposite to the first inclined portion and at a steeper angle than the first inclined portion. 3. The housing-type pipe joint according to claim 1, further comprising: a second inclined portion protruding outward in the direction, and a topmost portion formed between the first inclined portion and the second inclined portion.   4. The housing-type pipe joint according to claim 1, wherein the outer peripheral surface of the end portion of the tubular body has a small surface roughness relative to the other outer peripheral surface of the tubular body.   The housing-type pipe joint according to any one of claims 1 to 4, wherein the seal member is a self-sealing gasket that performs sealing by pressure of a fluid to be sealed, or a compression gasket that performs sealing by tightening with a housing. Frame,
A main shaft supported by a frame;
A support roller having a support surface composed of an annular convex part and a support flat part and rotatably attached to the main shaft;
A driving device for rotating the support roller;
A moving arm attached to the frame so as to be movable forward and backward with respect to the support roller;
A moving device for moving the moving arm;
A pressing roller having a pressing surface provided with an annular recess and a pressing flat portion and rotatably attached to the moving arm;
The convex portion of the support roller includes an annular first convex inclined portion that is inclined outward, an annular second convex inclined portion that is inclined outward in a direction opposite to the first convex inclined portion, and a first Having a top formed between one convex slope and a second convex slope;
The concave portion of the pressing roller includes an annular first concave inclined portion inclined inward, a second concave inclined portion inclined inward in the opposite direction to the first concave inclined portion, and a first concave inclined portion, A tubular body processing apparatus comprising a bottom portion formed between the second concave inclined portion.   By externally fitting the end of the tube body to the support roller, sandwiching the end of the tube body between the support roller and the pressure roller and rotating the support roller while pressing the pressure roller toward the support roller, The tubular body processing apparatus according to claim 6, wherein an annular protrusion protruding outward is continuously formed in an end portion of the tubular body in a circumferential direction of the tubular body. A step of externally fitting an end portion of a tubular body to a support roller having a support surface including an annular convex portion and a support flat portion;
A step of pressing a pressing roller having a pressing surface including an annular recess and a pressing flat portion toward the support roller through the end of the tubular body;
Rotating the support roller;
By sandwiching the end of the tube between the convex portion of the support roller and the recess of the pressing roller and rotating the support roller, an annular protrusion protruding outward from the end of the tube is formed in the circumferential direction of the tube. A tube forming method comprising: a step of continuously forming the tube.

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