JP2012041945A - Method and device for insertion of disengagement prevention member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and device for insertion of a disengagement prevention member that can accurately and efficiently insert the disengagement prevention member into an accommodation groove of a housing.SOLUTION: The method for inserting the disengagement prevention member 6 into the accommodation groove 4 formed at an annular socket 1 which is attached while surrounding a fluid pipe includes: a step in which the disengagement prevention members 6 are temporarily placed at two points which oppose each other in the radial direction of the accommodation groove 4; a step in which an insertion device 5 is set at the socket 1, and a pair of press-in parts 51 possessed by the insertion device 5 are arranged inside the accommodation groove 4; and a step in which a pair of the press-in parts 51 are displaced in a direction in which they separate from each other by the handle operation of the insertion device 5, and the disengagement prevention members 6 which are temporarily placed by the press-in parts 51 are pressed and inserted into the accommodation groove 4.

Description

  The present invention relates to a method of inserting a retaining member that can be locked to the outer peripheral surface of a fluid pipe into an accommodation groove formed in an annular housing that is mounted so as to surround the fluid pipe, and a device that can be used in the method. It is about.

  As disclosed in FIGS. 7 to 9 of Patent Document 1 below, the insertion port formed at the end of the other fluid pipe is inserted into the receiving port formed at the end of one fluid pipe. The retaining member disposed on the inner peripheral side of the receiving portion is locked to the outer peripheral surface of the inserting portion so that the fluid pipe having the inserting portion can be prevented from moving in the tube axis direction. Constructed pipe joints are known. In such a pipe joint, the receiving port portion becomes an annular housing that is mounted so as to surround the insertion port portion, and the retaining member is housed in the housing groove formed in the housing.

  In addition, as disclosed in FIGS. 2 to 4 of the above-mentioned document, the sealing material that seals between the inner periphery of the receiving portion and the outer periphery of the insertion portion is pressed with an annular fitting called a push ring. A pipe configured to prevent the fluid pipe having the insertion portion from moving in the tube axis direction by locking the retaining member disposed on the inner peripheral side of the push wheel to the outer peripheral surface of the insertion portion. Joints are also known. In such a pipe joint, the pusher wheel becomes an annular housing that is mounted so as to surround the insertion portion, and the retaining member is accommodated in an accommodation groove formed in the housing.

  In the operation of assembling the fluid pipe movement prevention device as described above, it is necessary to insert the retaining member with high accuracy into the housing groove of the housing such as the receiving part and the push ring. Temporarily, the amount of the retaining member inserted into the housing groove If variations occur in the position of the inserted retaining member or the posture of the inserted retaining member is broken, the retaining action of the retaining member with respect to the outer peripheral surface of the insertion portion tends to be difficult to be exhibited stably. In addition, from the viewpoint of productivity, it is desired to propose a method that can improve work efficiency when inserting the retaining member.

JP-A-61-88091

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a retaining member insertion method and a retaining member insertion device capable of accurately and efficiently inserting a retaining member into a housing groove of a housing. There is.

  The above object can be achieved by the present invention as described below. That is, in the method for inserting a retaining member according to the present invention, a retaining member that can be locked to the outer peripheral surface of the fluid pipe is inserted into an accommodation groove formed in an annular housing that surrounds and is attached to the fluid pipe. In the method for inserting the retaining member, the step of temporarily placing the retaining member at two locations in the radial direction of the receiving groove, the insertion device is set in the housing, and the pair of pushing portions included in the insertion device are A step of disposing inside the receiving groove and a handle operation of the insertion device are used to displace the pair of pushing portions away from each other, and the holding member temporarily placed by each of the pushing portions is pressed into the receiving groove. And a step of inserting.

  In the retaining member insertion method according to the present invention, the retaining member temporarily placed in the housing groove can be pressed by the pushing portion of the insertion device set in the housing, so that the retaining member is accurately inserted into the housing groove. can do. In addition, since the retaining member can be inserted simultaneously at two locations by the pair of pushing portions, it is possible to improve work efficiency when inserting the retaining member.

  In the retaining member insertion method of the present invention, before the step of temporarily placing the retaining member, a pedestal is inserted into the housing placed with the tube axis direction up and down, and the seating surface of the pedestal is placed in the receiving groove. What arrange | positions to the height of the inner wall surface of the back | inner side of is preferable. In this case, the retaining member can be stably placed temporarily by inserting the base into the housing, and workability can be improved by preventing the temporarily placed retaining member from falling. As a result, the retaining member can be more accurately and efficiently inserted into the housing groove.

  The retaining member insertion device according to the present invention inserts a retaining member that can be locked to the outer peripheral surface of the fluid pipe into an accommodation groove formed in an annular housing that surrounds and is attached to the fluid pipe. In the retaining member insertion device, a pair of pushing portions that press the retaining member from the inside, a handle that can be operated so as to displace the pair of pushing portions away from each other, and a relative position with respect to the housing And a positioning part to be defined.

  The retaining member insertion device according to the present invention can be used in the above-described method since the pair of pushing portions can be displaced in a direction away from each other by a handle operation after the relative position with respect to the housing is determined by the positioning portion. Thus, the retaining member can be efficiently and efficiently inserted into the housing groove of the housing.

  In the retaining member insertion device of the present invention, the first member and the second member having the handle at one end and the pushing portion at the other end are between the handle and the pushing portion. It is preferable that the pair of pushing portions are displaced in a direction away from each other by being pivotally supported by a fulcrum portion that is positioned, and by causing the pair of handle portions constituting the handle to approach or separate from each other. According to such a configuration, the insertion device can be configured simply, and a handle operation for displacing the pair of pushing portions can be easily performed.

  In the above, it is preferable that the positioning portion is in contact with the housing from the tube axis direction, and the fulcrum portion is configured to be movable relative to the positioning portion in the tube axis direction. According to such a configuration, in the process of displacing the pair of pushing portions in a direction away from each other, the tube axial position of the pushing portions is held constant, and the retaining member is pressed with high accuracy in the radial direction. Can be inserted into.

  In the retaining member insertion device of the present invention, it is preferable that the positioning portion engages with the housing and engages in the radial direction. According to this configuration, it is possible to accurately prevent the displacement of the insertion device with respect to the housing, and to insert the retaining member with higher accuracy.

Longitudinal sectional view of the pipe joint (AA sectional view of FIG. 2) Front view of the receptacle Development view when the receiving part is viewed from the inner periphery (A) BB sectional view and (b) CC sectional view of the retaining member shown in FIG. Longitudinal sectional view of a fluid pipe having a receiving part Longitudinal sectional view of the fluid pipe when the retaining member is temporarily placed in the receiving groove Longitudinal section of the fluid pipe when the insertion device is set in the receiving port Longitudinal section of the fluid pipe when the insertion device is set in the receiving port Longitudinal sectional view of the fluid pipe when the retaining member is pressed and inserted into the receiving groove Perspective view of insertion device Top view showing the tip of the push-in part

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, the configuration of the fluid pipe movement prevention device will be briefly described with reference to FIGS.

  In the pipe joint shown in FIGS. 1 and 2, the insertion port 2 formed at the end of the fluid pipe P <b> 2 is inserted into the reception port 1 formed at the end of the fluid pipe P <b> 1. Is sealed with an annular sealing material 3. In this embodiment, the fluid pipes P1 and P2 are water ducts made of ductile cast iron. However, the present invention is not limited to this, and other fluid pipes such as gas pipes and plant pipes may be used. The receiving portion 1 may be formed at the end of a pipe joint body interposed between two fluid pipes.

  The receiving portion 1 is an annular housing that is mounted so as to surround the insertion portion 2, and an accommodation groove 4 that opens toward the insertion portion 2 is formed in an annular shape on the inner peripheral side thereof, and in the pipe circumferential direction. A plurality of (four in the present embodiment) retaining members 6 arranged are accommodated. The retaining member 6 has a claw 8 having a triangular cross section curved along the outer peripheral surface of the insertion portion 2 on the inner peripheral surface, and is configured to be able to be locked to the outer peripheral surface of the insertion portion 2. On each outer peripheral side of the retaining member 6, a push bolt 7 is screwed into a screw hole penetrating the outer peripheral wall of the receiving groove 4, so that the retaining member 6 can be pressed toward the insertion portion 2. Yes.

  In the state of FIG. 1, when the insertion port 2 is about to come out from the receiving port 1, the locking operation of the retaining member 6 with respect to the outer peripheral surface of the insertion port 2 prevents the fluid tube P <b> 2 from moving in the tube axis direction. The detachment of the insertion portion 2 is prevented. Moreover, in this embodiment, the inclined surface 6a is formed in the outer peripheral surface of the retaining member 6, and when the force which the insertion part 2 pulls out acts, the front-end | tip of the push bolt 7 is retained by the wedge effect. 6 is pressed to the inner peripheral side, the contact resistance of the claw 8 with respect to the outer peripheral surface of the insertion portion 2 is increased, and the movement preventing effect by the retaining member 6 is enhanced.

  As shown in FIGS. 1, 3, and 4, in this embodiment, two claws 8 are provided at intervals in the tube axis direction, and between the retaining members 6 adjacent in the tube circumferential direction, the claws 8 Are arranged so as to overlap in the tube axis direction. Thereby, the contact area of the claw 8 with respect to the outer peripheral surface of the insertion portion 2 is continuously formed in the pipe circumferential direction, and the movement preventing effect by the retaining member 6 is remarkably improved. In the structure in which the claws 8 are overlapped as described above, it is important to insert the retaining member 6 with high accuracy into the housing groove 4 so that the claws 8 do not interfere between adjacent retaining members 6. .

  The retaining member 6 is fitted into the receiving groove 4 via the movement restricting member 11 and the holding member 12, and is held so as not to drop off from the receiving portion 1. The movement restricting member 11 and the holding member 12 are respectively attached to the side surfaces 61 and 62 of the retaining member 6, and in the present embodiment, both are made of sheet-like rubber. The movement restricting member 11 is preferably made of an elastic material and is harder than the holding member 12. The holding member 12 is preferably formed of an elastic material such as rubber or urethane.

  The holding member 12 always abuts against the inner wall surface 42 on the back side of the housing groove 4 and biases the retaining member 6 toward the inner wall surface 41 on the near side of the housing groove 4. For this reason, a gap D corresponding to the thickness of the movement restricting member 11 is provided between the side surface 61 and the inner wall surface 41 of the retaining member 6. When a force is applied to pull out the insertion portion 2, the retaining member 6 moves toward the inner wall surface 41 accordingly, but at this time, the claw 8 can be locked to the outer peripheral surface of the insertion portion 2. It is determined on the basis of the interval D in a different state.

  In order to stably exhibit the function of preventing the movement of the fluid pipe P2 in the pipe axis direction, it is effective to suppress variation in the movement allowance of the retaining member 6. For example, if the movement allowance is different between the retaining member 6 located above the fluid pipe P2 and the retaining member 6 located below the fluid pipe P2, the movement preventing effect is hardly stably exhibited. In particular, when a strong load is applied to the fluid pipe P2, the ultimate performance may be affected by variations in the movement allowance of the retaining member 6.

  In this pipe joint, the push bolt 7 tries to push the retaining member 6 in an oblique direction, but the holding member 12 comes into contact with the inner wall surface 42 and the distance D is held constant via the movement restricting member 11. Therefore, the movement allowance of the retaining member 6 is determined without being influenced by the pushing amount or the groove width of the receiving groove 4. As a result, even when the push-in amounts by the push bolts 7 are different from each other, or even when the housing is a casting (for example, cast iron) and the dimensional tolerance is large, variation in the movement allowance of the retaining member 6 is suppressed, The effect of preventing the movement of the pipe P2 can be stably exhibited.

  Next, a method for inserting the retaining member 6 into the receiving groove 4 of the receiving port 1 which is a housing and a device used for the method will be described. 1, 6, 7 </ b> A, and 8, the retaining member 6 is depicted in a side view as viewed from the circumferential direction.

  FIG. 5 is a longitudinal sectional view of the fluid pipe P1 placed with the receiving port 1 facing upward, and the retaining groove 6 does not yet have the retaining member 6 built therein. First, as shown in FIG. 6, the retaining member 6 is temporarily placed at two locations facing the receiving portion 1 in the radial direction (left-right direction in FIG. 6). The temporary placement may be performed manually by the operator, and the retaining member 6 is lightly fitted inside the housing groove 4 in the radial direction. In this example, the retaining member 6 is set slightly diagonally so that the protruding portion of the holding member 12 is hooked.

  In the present embodiment, before the retaining member 6 is temporarily placed, the base 9 is inserted into the receiving portion 1 placed with the tube axis direction up and down as shown in FIG. It is arranged at the height of the inner wall surface 42. Therefore, the retaining member 6 can be temporarily placed stably, and the workability can be improved by preventing the temporarily placed retaining member 6 from dropping. As long as such an effect is obtained, the position of the seating surface 9a may be slightly higher or lower than the inner wall surface 42. The use of the pedestal 9 is arbitrary, and in the present embodiment, it is a bottomed cylindrical body that can be placed on the back end 1a of the receiving portion 1, but the shape of the pedestal 9 is not limited to this.

  Subsequently, as shown in FIGS. 7A and 7B, the insertion device 5 is set in the receiving portion 1, and the pair of pushing portions 51 included in the insertion device 5 are arranged inside the accommodation groove 4. FIG. 7B corresponds to a cross section of the receiving portion 1 of FIG. 7A viewed from the side. The inserted insertion device 5 is in a state in which the relative position in the tube axis direction is fixed with respect to the receiving portion 1. At this time, the distance between the pair of pushing portions 51 is shortened by the spring 57, and the position of the pushing portion 51 in the tube axis direction may be shifted from the retaining member 6. The step of setting the insertion device 5 may be before or after the step of temporarily placing the retaining member 6.

  Next, as shown in FIG. 8, the pair of pushing portions 51 are displaced in a direction away from each other by a handle operation of the insertion device 5, and the retaining member 6 temporarily placed by each of the pushing portions 51 is pressed and accommodated. Insert into groove 4. This makes it possible to insert the retaining member 6 with high accuracy while keeping the amount of the retaining member 6 inserted into the housing groove 4 constant, and to insert the retaining member 6 at two locations simultaneously by the pair of pushing portions 51. Can be enhanced. The handle operation of the insertion device 5 may be performed manually by the operator.

  In the present embodiment, since the retaining member 6 to which the movement restricting member 11 and the holding member 12 are attached is fitted in the accommodation groove 4, it is necessary to press the retaining member 6 firmly and press-fit. The insertion amount of the retaining member 6 with respect to the groove 4 is likely to vary, but according to such an insertion method, the retaining member 6 can be accurately inserted into the housing groove 4.

  Thereafter, the retaining members 6 are inserted in the same manner as described above at two locations facing the radial direction (left and right direction in FIG. 7B) of the receiving groove 4 shown in FIG. 7B. Between the adjacent retaining members 6, the claws 8 are arranged so as to overlap each other in the tube axis direction. However, according to this insertion method, the retaining members 6 can be inserted with high accuracy. It is easy to prevent interference of the nail 8 between them. After inserting the retaining member 6, the insertion device 5 and the base 9 are removed from the receiving portion 1, and the push bolt 7 and the sealing material 3 are attached to provide the fluid pipe movement prevention device as shown in FIGS. be able to.

  As shown in FIG. 9, the insertion device 5 includes a pair of pressing portions 51 that press the retaining member 6 from the inside, and a handle 52 that can be operated so as to displace the pair of pressing portions 51 away from each other. And a positioning part 53 for determining a relative position with respect to the receiving part 1. Furthermore, in this embodiment, the positioning part 53 is provided with the contact part 53a which contact | abuts the receiving part 1 from a pipe-axis direction, and the engaging part 53b engaged with the receiving part 1 in radial direction. For convenience of illustration, in FIGS. 7A, 7B, and 8, only the positioning portion 53 is shown being broken.

  The insertion device 5 set in the receiving portion 1 is in a state where the relative position in the tube axis direction with respect to the receiving portion 1 is determined by the positioning portion 53. The positioning portion 53 has an abutting portion 53a that abuts on the end surface of the receiving portion 1 from the tube axis direction. The abutting portion 53a of the present embodiment includes the flange 1b of the receiving portion 1 that protrudes in the tube axis direction. It is configured as a fixing ring having substantially the same shape. An engaging portion 53b is integrally attached to the fixing ring 53a, and is configured as a pair of side plates in this embodiment.

  As shown in FIG. 7B, the side plate 53b protrudes more in the tube axis direction than the fixing ring 53a. By externally fitting the side plate 53b to the flange 1b, the positioning portion 53 is fitted to the receiving portion 1 so as to be radial. Can be engaged. Thereby, the position shift of the insertion device 5 with respect to the receptacle 1 can be prevented accurately, and the retaining member 6 can be inserted with higher accuracy. Instead of this configuration, the outer peripheral edge of the fixing ring 53a may be extended in the tube axis direction, and the fixing ring 53a itself may be fitted into the flange 1b.

  The pair of pushing portions 51 are displaced radially outward and in opposite directions by the operation of the handle 52, and press against the inner peripheral surface of the retaining member 6. Therefore, it is preferable to attach a cushioning material such as rubber to the tip of the pushing portion 51 so as not to damage the claw 8 of the retaining member 6. Alternatively, it is also effective to adjust the tip shape of the pushing portion 51 so that a portion other than the claw 8 of the retaining member 6 (for example, between the two claws 8) can be pressed.

  As shown in FIG. 10A, the tip of the pushing portion 51 is gently curved along the circumferential direction of the fluid pipe P1, and fits to the inner circumferential surface of the retaining member 6. Further, as shown in FIG. 10B, it is also effective to bulge both sides in the circumferential direction at the tip of the push-in portion 51 so that the retaining member 6 is not biased toward one side in the circumferential direction.

  In the present embodiment, the first member 50 </ b> A and the second member 50 </ b> B each having the handle 55 at one end and the pushing portion 51 at the other end are located between the handle 55 and the pushing portion 51. A fulcrum portion 56 is pivotally supported so that a pair of handle portions 55 form a handle 52. Then, by bringing the pair of handle portions 55 close to each other, as shown in FIG. 8, the pair of pushing portions 51 are displaced in directions away from each other, and are used for inserting the retaining member 6. The pair of pushing portions 51 separated from each other easily return to the original position by the bias of the spring 57.

  The shaft 54 that constitutes the rotation shaft at the fulcrum portion 56 is inserted into a long hole 53 c formed in the pair of side plates 53 b and is gently fixed by a fastener 58. 7A and 7B, when the insertion device 5 is set in the receiving portion 1, the shaft 54 is located above the elongated hole 53c extending in the tube axis direction, and the shaft 54 is operated in accordance with the operation of the handle 52. By applying a downward force to the shaft 54, the shaft 54 moves to the lower side of the long hole 53c as shown in FIG.

  Thus, in the present embodiment, the fulcrum part 56 is configured to be movable relative to the positioning part 53 in the tube axis direction. According to such a configuration, in the process of displacing the pair of pushing portions 51 in the direction away from each other, the tube axis direction position of the pushing portions 51 is held constant, and the retaining member 6 is accurately pressed in the radial direction. Can be inserted into the receiving groove 4. In other words, the pushing portion 51 moves while drawing an arc centered on the fulcrum portion 56, but by displacing the fulcrum portion 56 in the tube axis direction, the position in the tube axis direction of the pushing portion 51 can be kept constant. is there.

  In the present embodiment, an example is shown in which when the pair of handle portions 55 are brought close to each other, the pair of pushing portions 51 are separated from each other, but instead of this, a mechanism such as a scissors is used to separate the pair of handle portions 55 from each other. Thus, the pair of pushing portions 51 may be separated from each other. Further, in the present embodiment, the first member 50A and the second member 50B having the same shape are combined, but these shapes may be different.

  In the present embodiment, an example is shown in which the claws 8 are arranged so as to overlap each other between the adjacent retaining members 6 in the tube axis direction, but the present invention is not limited to this, and the claws 8 overlap in the tube axis direction. It does not matter if the arrangement is not necessary. In such a case, the accommodation groove 4 may be provided intermittently in the circumferential direction independently for each retaining member 6. Moreover, the number of the nail | claw 8 which the retaining member 6 has may be one or three or more irrespective of the adoption of such arrangement | positioning of a nail | claw.

  In the present embodiment, an example in which the receiving portion of the fluid pipe is a housing is shown. However, the present invention is not limited to this, and a sealing material interposed between the inner periphery of the receiving portion and the outer periphery of the insertion portion is a tube. An annular push ring that can be pressed in the axial direction (for example, see JP-A-11-63328) may be used as the housing. Such a push ring is mounted so as to surround the insertion portion, and a retaining member is housed in a housing groove formed on the inner peripheral side to constitute a fluid pipe movement prevention device. As for the other structure of the press ring, a known structure in this technical field can be used without limitation.

  Furthermore, in the present invention, a reinforcing metal fitting having a hook that engages with the flange of the receiving portion when a force is applied to surround the insertion portion of the pipe joint and the insertion portion is pulled out from the receiving portion (for example, Japanese Patent Laid-Open No. 10-122466) or a non-average force support device (see, for example, Japanese Patent Laid-Open No. 2002-243066) that is mounted so as to surround the fluid pipe may be used as the housing. Such reinforcing metal fittings and support devices constitute a fluid pipe movement prevention device by accommodating a retaining member in a housing groove formed on the inner peripheral side thereof.

  The housing is not limited to being integrally formed as an annular body, but may be a split structure formed in an annular shape by assembling peripheral ends of a plurality of divided pieces. In addition, the receiving portion 1 as the housing described above is provided with the push bolt 7 that presses the retaining member 6 toward the insertion portion 2. However, the present invention is not limited to this. You may make it press by the wedge effect in the outer peripheral wall.

1 Receiving part (an example of housing)
2 Insertion Portion 4 Housing Groove 5 Inserting Device 6 Stopping Member 8 Claw 9 Base 11 Movement Restricting Member 12 Holding Member 41 Inner Wall Surface 42 Inner Wall Surface 50A First Member 50B Second Member 51 Pushing Portion 52 Handle 53 Positioning Portion 54 Shaft 55 Handle 56 Pivot P1 Fluid Pipe P2 Fluid Pipe

Claims (6)

In a retaining member insertion method of inserting a retaining member that can be locked to the outer peripheral surface of the fluid pipe into an accommodation groove formed in an annular housing that is mounted surrounding the fluid pipe.
Temporarily placing a retaining member at two locations in the radial direction of the receiving groove;
A step of setting an insertion device in the housing and disposing a pair of pushing portions of the insertion device inside the housing groove;
And a step of displacing the pair of pushing portions away from each other by a handle operation of the inserting device, and pressing the retaining member temporarily placed by each of the pushing portions and inserting the holding member into the receiving groove. A method for inserting a retaining member.   Before the step of temporarily placing the retaining member, a pedestal is inserted into the housing placed with the tube axis direction up and down, and the seat surface of the pedestal is disposed at the height of the inner wall surface on the back side of the receiving groove The method for inserting a retaining member according to claim 1. In a retaining member insertion device for inserting a retaining member that can be locked to the outer peripheral surface of the fluid pipe into an accommodation groove formed in an annular housing that is mounted to surround the fluid pipe.
A pair of pressing portions that press the retaining member from the inside; a handle that can be operated so that the pair of pressing portions are displaced in a direction away from each other; and a positioning portion that determines a relative position with respect to the housing. A retaining member insertion device characterized by the above.   A first member and a second member having a handle portion at one end and the pushing portion at the other end are rotatably supported at a fulcrum portion located between the handle portion and the pushing portion. 4. The retaining member insertion device according to claim 3, wherein the pair of pushing portions are displaced in a direction away from each other by moving the pair of handle portions constituting the handle close to or away from each other.   5. The retaining member insertion device according to claim 4, wherein the positioning portion abuts on the housing from the tube axis direction, and the fulcrum portion is configured to be movable relative to the positioning portion in the tube axis direction.   6. The retaining member insertion device according to claim 3, wherein the positioning portion engages with the housing and engages in a radial direction.

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