JP2013036369A - Jig attachment device, and impeller nut fastening and loosening device with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a working jig to be attached to a rotator even if a structure for fixing the jig to the rotator is not formed in advance.SOLUTION: A jig attachment device 60b includes: an annular frame 61b that surrounds an outer circumference of an impeller 10, which is the rotator and where a jig attachment screw hole having the working jig 40 attached thereto is formed; and pressing bodies 71b that are provided at intervals in the circumferential direction of the frame, and an end of which radially moves in the frame 61b to be brought into contact with the outer circumference 13 of the impeller 10.

Description

  The present invention relates to a jig attachment device for attaching a work jig to a rotating body, and an impeller nut tightening device provided with the same.

  A vertical centrifugal pump such as a primary coolant pump in a nuclear power plant includes a casing, an impeller rotatably disposed in the casing, a rotating shaft having the impeller fixed to one end thereof, and a rotating shaft. And a bearing that rotatably supports the end side.

  The impeller as a rotating body is fixed by screwing an impeller nut into one end portion of the rotating shaft after being inserted into one end portion side of the rotating shaft. A large torque is required for tightening (tightening and loosening) the impeller nut. In particular, after operating the pump for a long time, the frictional force between the impeller nut and the rotating shaft may increase, and it may be extremely difficult to loosen the impeller nut.

  Therefore, Patent Document 1 below proposes a work jig that facilitates attachment and removal work of an impeller that is a rotating body.

  This work jig has a nut runner and a nut runner support plate. The nut runner is formed with a nut side fitting hole in which the impeller nut is fitted so as not to be relatively rotatable, and a wrench side fitting hole in which the output end of the hydraulic wrench is fitted so as not to be relatively rotatable. The nut runner support plate includes a reaction force receiving portion that receives a reaction force of a hydraulic wrench whose output end is fitted in the wrench-side fitting hole, and an insertion hole through which the tip end portion of the nut runner is inserted so as to be relatively rotatable. A jig mounting bolt hole into which a jig mounting bolt to be screwed into the impeller is inserted is formed.

  When attaching the impeller to the rotating shaft using this work jig, first, the impeller is inserted through one end of the rotating shaft, and then the impeller nut is lightly screwed into one end of the rotating shaft. Get in. Next, the impeller nut is fitted into the nut-side fitting hole of the nut runner, and the tip end portion of the nut runner is inserted into the insertion hole of the nut runner support plate. Insert the jig mounting bolt into the jig mounting bolt hole of the nut runner support plate in this state, and screw the jig mounting bolt into the screw hole formed in the impeller in advance to fix the nut runner support plate to the impeller. . Next, in a state where the body of the hydraulic wrench is in contact with the reaction force receiving portion of the nut runner support plate, the output end of the hydraulic wrench is fitted into the wrench side fitting hole formed in the tip end portion of the nut runner. Then, the hydraulic wrench is operated to rotate the impeller nut fitted to the nut runner together with the nut runner so as not to be relatively rotatable, so that the impeller nut is firmly fastened to the rotating shaft.

  When removing the impeller from the rotating shaft using this work jig, as described above, the nut runner is attached to the impeller nut screwed into the rotating shaft, and the nut runner support plate is fixed to the impeller. A hydraulic wrench is attached to these, and the hydraulic wrench is operated in the opposite direction to that during tightening.

Japanese Patent No. 3403020

  The work jig described in Patent Document 1 requires that a screw hole be formed in the impeller in advance in order to fix the nut runner support plate to the impeller with a bolt, and the nut runner is provided in the impeller in which the screw hole is not formed. There is a problem that the support plate cannot be fixed and the work jig cannot be used.

  Therefore, in the present invention, even if the structure for fixing the jig to the rotating body is not formed in advance, the jig mounting device that can mount the working jig to the rotating body, and the impeller nut provided with the same An object is to provide a tightening device.

The jig mounting device according to the invention for solving the above problems is
In a jig mounting apparatus for attaching a work jig to a rotating body that rotates about a rotation axis, a jig for surrounding the outer periphery of the rotating body around the rotation axis and attaching the work jig for attaching the work jig to the rotating body. In the fixture mounting apparatus, an annular frame that surrounds the outer periphery of the rotating body around the rotational axis of the rotating body and has a jig mounting portion for mounting the work jig, and the annular frame, A plurality of pressure contact bodies are provided at intervals in the circumferential direction of the frame, and an end portion moves in the radial direction of the frame and is capable of being pressed against the outer peripheral surface of the rotating body.

  In the jig mounting apparatus, the rotating body is disposed on the inner peripheral side of the annular frame, and the end of the press contact body is brought into pressure contact with the outer peripheral surface of the rotating body, whereby the jig mounting apparatus is attached to the rotating body. Disable relative movement. In this state, the work jig is attached to the jig attachment portion of the frame. As a result, the work jig is attached to the rotating body via the jig attachment device.

  Therefore, according to the jig mounting apparatus, the work jig can be mounted on the rotating body even if the structure for fixing the jig is not formed on the rotating body in advance.

  Here, in the jig mounting device, a plurality of cylinder chambers that are recessed from the inner peripheral side toward the outer peripheral side are formed in the annular frame, and the driving fluid is supplied into the cylinder chamber from the outer peripheral side. A fluid supply hole may be formed, and the pressure contact body may include a piston that is inserted into the cylinder chamber and that can protrude and retract from the cylinder chamber toward the inner peripheral side in the radial direction.

  In the jig mounting apparatus, a cylinder chamber is formed in the frame, and by arranging a piston here, it is not necessary to separately provide a fluid pressure cylinder that functions as a pressure contact body, so the number of parts can be reduced. .

  Moreover, in the jig mounting apparatus, it is preferable that at least a portion including the inner peripheral surface of the piston is formed of a viscoelastic material.

  In the jig mounting device, the portion of the piston that presses against the outer peripheral surface of the rotating body is formed of a viscoelastic material, so the jig mounting device is mounted on the rotating body without damaging the outer peripheral surface of the rotating body. be able to.

  In the jig mounting device, the piston may include a piston body formed of the viscoelastic material and a reinforcing member that increases the rigidity of the piston in a direction perpendicular to the moving direction of the piston. Good.

  In the jig mounting apparatus, the strength of the piston can be ensured while taking advantage of part of the piston formed of a viscoelastic material.

  The jig mounting device may further include an urging member that urges the piston that has moved from the cylinder chamber to the inner peripheral side toward the outer peripheral side.

  In the jig mounting device, when the piston moves to the inner peripheral side, when the driving fluid can be discharged from the cylinder chamber, the piston can be immediately returned to the original position by the biasing member. Therefore, in the jig attachment device, the jig attachment device attached to the rotating body can be easily detached from the rotating body in a short time.

  In the jig mounting apparatus, the annular frame has a plurality of screw holes penetrating from the outer peripheral side to the inner peripheral side, and the press contact body has press contact screws that can be screwed into the screw holes. May be.

  In this case, the press contact body may include the press contact screw and a pad that is attached to a distal end portion of the press contact screw and can be press contacted to the outer peripheral surface of the rotating body.

  Further, in the jig mounting device, the press contact body includes a fluid pressure cylinder, and the fluid pressure cylinder is fixed to the piston, a piston capable of reciprocating in the cylinder casing, and the piston. A piston rod projecting from the cylinder casing to one side of the piston in the reciprocating direction, and the annular frame is formed with a plurality of pressure contact body insertion holes penetrating from the outer peripheral side to the inner peripheral side. The cylinder casing of the fluid pressure cylinder may be fixed to the frame so that the piston rod is inserted into the pressure contact body insertion hole and faces the inner peripheral side.

  In this case, the pressure contact body may include the fluid pressure cylinder and a pad attached to a tip end portion of the piston rod of the fluid pressure cylinder and capable of pressure contact with the outer peripheral surface of the rotating body.

  Here, in the jig mounting apparatus having a pad, at least a portion including a surface on the inner peripheral side of the pad may be formed of a viscoelastic material.

  In the jig mounting device, the portion that presses the outer peripheral surface of the rotating body in the press contacting body is formed of a viscoelastic material, so that the jig mounting device is attached to the rotating body without damaging the outer peripheral surface of the rotating body. Can be attached.

  In the jig mounting apparatus in which a part of the press contact body is formed of a viscoelastic material, the viscoelastic material is preferably rubber.

  In the jig mounting apparatus, it is possible to increase the frictional force acting between the pressure contact body and the outer peripheral surface of the rotating body.

  Further, in the jig mounting device, the rotating body is an impeller in which the through hole passing through the rotation axis is formed, and the work jig is inserted into the through hole of the impeller at one end of the rotating shaft. A hydraulic pressure wrench to which an impeller nut is screwed into one end portion in a state where the portion is inserted, a nut-side fitting hole into which the impeller nut is fitted so as not to be relatively rotatable, and A nut runner in which a wrench-side fitting hole is formed in which the output end of the fluid pressure wrench is fitted in a relatively non-rotatable manner, and a reaction force of the fluid wrench in which the output end is fitted in the wrench-side fitting hole. A reaction force receiving portion to be received, a runner insertion hole through which the end of the nut runner where the wrench-side fitting hole is formed are inserted so as to be relatively rotatable, and a bolt hole into which a jig mounting bolt is inserted are formed. Natura And the jig mounting portion of the frame is a jig mounting screw hole into which the jig mounting bolt inserted into the bolt hole of the nut runner support plate is screwed. May be.

  In this case, an impeller nut tightening device can be constituted by the jig mounting device and the work jig.

  In the present invention, the work jig can be attached to the rotating body even if the structure for fixing the jig to the rotating body is not formed in advance.

It is a top view of the impeller nut tightening apparatus in 1st embodiment which concerns on this invention. It is sectional drawing of the impeller nut fastening apparatus in 1st embodiment which concerns on this invention. It is the III-III sectional view taken on the line in FIG. FIG. 4 is a sectional view taken along line IV-IV in FIG. 3. It is the VV sectional view taken on the line in FIG. It is a top view of the impeller nut tightening apparatus in 2nd embodiment which concerns on this invention. It is sectional drawing of the impeller nut fastening apparatus in 2nd embodiment which concerns on this invention. It is the VIII-VIII sectional view taken on the line in FIG. It is the IX-IX sectional view taken on the line in FIG. It is the XX sectional view taken on the line in FIG. It is a top view of the impeller nut tightening apparatus in 3rd embodiment which concerns on this invention. It is sectional drawing of the impeller nut fastening apparatus in 3rd embodiment which concerns on this invention. It is the XIII-XIII sectional view taken on the line in FIG. It is explanatory drawing which shows the structure of the air pressure generator of the impeller nut clamping | tightening apparatus in 3rd embodiment which concerns on this invention. It is principal part sectional drawing of the jig | tool attachment apparatus of the 1st modification in 3rd embodiment which concerns on this invention. It is principal part sectional drawing of the jig | tool attachment apparatus of the 2nd modification in 3rd embodiment which concerns on this invention. It is principal part sectional drawing of the jig | tool attachment apparatus of the 3rd modification in 3rd embodiment which concerns on this invention. It is sectional drawing of a vertical centrifugal pump.

  Hereinafter, various embodiments of an impeller nut tightening device according to the present invention will be described in detail with reference to the drawings.

  First, before describing an embodiment of an impeller nut tightening device, a device in which the impeller nut tightening device is used will be described.

  An apparatus in which the impeller nut tightening apparatus is used is a rotating machine in which a rotating body is rotatably disposed in a casing, and is, for example, a vertical centrifugal pump such as a primary coolant pump in a nuclear power plant.

  As shown in FIG. 18, the pump 1 supports an impeller 10 that is a rotating body, a rotating shaft 20 of the impeller 10, a casing 25 in which the impeller 10 is rotatably stored, and a rotating shaft 20 that is rotatably supported. And a shaft box 27 for fixing the bearing 26 to the casing 25.

  A male screw 21 for fixing the impeller 10 is formed at one end of the rotating shaft 20, and a coupling 24 for connecting a motor is provided at the other end.

  The impeller 10 is formed with a through hole 11 passing through the rotation axis A thereof. In the impeller 10, an impeller nut 15 is screwed into a male screw 21 formed at one end of the rotating shaft 20 in a state where one end of the rotating shaft 20 is inserted into the through hole 11. The rotating shaft 20 is fixed to the rotating shaft 20 by screwing a locking bolt 19 into the rotating shaft 20 through the nut 15.

  The impeller nut tightening device described below is a device for tightening (tightening and loosening) the impeller nut 15 when the impeller 10 is attached to and detached from the rotary shaft 20.

"First embodiment"
Next, a first embodiment of an impeller nut tightening device according to the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, the impeller nut tightening device of the present embodiment includes a work jig 40 to which a hydraulic wrench 30 for screwing the impeller nut 15 into the male screw 21 of the rotating shaft 20 is attached, and the work jig 40. And a jig attachment device 60 for attaching the jig 40 to the impeller 10. Note that FIG. 2 is a diagram drawn upside down from FIG.

  The work jig 40 includes a cylindrical nut runner 41 and a nut runner support plate 51. The cylindrical nut runner 41 is formed with a nut-side fitting hole 42 that is fitted to the impeller nut 15 so as not to be relatively rotatable, and a wrench-side fitting hole 43 that is fitted to the output end 31 of the hydraulic wrench 30 so as not to be relatively rotatable. ing. Further, the nut runner support plate 51 is formed with a reaction force receiving portion 55 that receives the reaction force of the hydraulic wrench 30 whose output end 31 is fitted in the wrench side fitting hole 43 of the nut runner 41.

  The impeller nut 15 is formed with a through hole 16 passing through the central axis thereof, and a female screw 17 is formed on one side of the through hole 16 to which the male screw 21 of the rotary shaft 20 can be screwed. . Further, a square head 18 having a square cross section is formed on the impeller nut 15 on the side opposite to the female screw 17. The rectangular head 18 of the impeller nut 15 is fitted into the nut-side fitting hole 42 of the nut runner 41 described above.

  The nut runner support plate 51 has a length in the longitudinal direction substantially the same as the outer diameter of the suction port side end portion 12 of the impeller 10. The nut runner support plate 51 has a plate-like plate portion 52 and flange portions 56 formed on both sides in the longitudinal direction of the plate portion 52. A runner insertion hole 53 through which the end of the nut runner 41 on the side where the wrench-side fitting hole 43 is formed is inserted so as to be relatively rotatable. An oilless bearing 54 is provided in the runner insertion hole 53. The cylindrical nut runner 41 is attached to the nut runner support plate 51 so as to be relatively rotatable by an oilless bearing 54 provided in the runner insertion hole 53. Further, the above-described reaction force receiving portion 55 is formed on the plate portion 52. Each flange portion 56 is formed with a plurality of bolt holes 57 through which the jig mounting bolts 59 are inserted. Note that the penetration direction of the bolt hole 57 with respect to the flange portion 56 is the same direction as the penetration direction of the runner insertion hole 53 with respect to the plate portion 52.

  The jig mounting device 60 includes an annular frame 61 that surrounds the outer periphery of the suction port side end portion 12 of the impeller 10, and the frame 61. The end portion moves in the radial direction of the frame 61 and the suction port of the impeller 10. A plurality of press contact bodies 71 capable of being press-contacted to the outer peripheral surface 13 of the side end portion 12.

  The frame 61 has an annular shape, and has an inner diameter that is slightly larger than the outer diameter of the suction port side end 12 of the impeller 10 and one end in the axial direction in which the axis of the annular frame main body 62 extends. And a flange portion 66 protruding to the inner peripheral side.

  As shown in FIGS. 3 to 5, the annular frame main body 62 includes a groove 63 that is recessed from the inner peripheral side to the outer peripheral side, and a plurality of press contact body screw holes 64 that penetrate the groove 63 from the outer peripheral side. Is formed. The plurality of press contact body screw holes 64 are formed at equal intervals in the circumferential direction of the annular frame main body 62. The flange 66 is formed with a plurality of jig mounting screw holes 67 penetrating in the axial direction of the annular frame main body 62.

  The press contact body 71 includes a press contact screw 72 that can be screwed into the press contact body screw hole 64 of the frame 61, and a pad 77 and a stopper 79 attached to the tip of the press contact screw 72. The press contact screw 72 includes a male screw portion 73 that can be screwed into the press contact body screw hole 64 of the frame 61, a screw head 74 formed at one end of the male screw portion 73, and the other of the male screw portion 73. And a columnar pad mounting portion 75 formed at the end of each. The columnar pad attachment portion 75 has an outer diameter smaller than the outer diameter of the male screw portion 73 and extends in a direction away from the screw head 74. The pad 77 is formed in a size that can be projected and retracted in the radial direction of the frame 61 with respect to the groove 63 of the frame 61. Further, the pad 77 is formed with an insertion hole 78 that penetrates the groove 63 in the protruding and retracting direction and into which the pad mounting portion 75 of the press contact screw 72 is inserted. The stopper 79 has an outer diameter larger than the inner diameter of the insertion hole 78, and the pad attachment portion 75 of the press contact screw 72 is inserted into the insertion hole 78 of the pad 77 at the tip of the pad attachment portion 75. It is attached and the pad 77 is restrained so as not to move relative to the press contact screw 72.

  Next, the installation work and the removal work of the impeller 10 with respect to the rotating shaft 20 are demonstrated.

  When attaching the impeller 10 to the rotating shaft 20, first, one end of the rotating shaft 20 is inserted into the through hole 11 of the impeller 10. Next, the impeller nut 15 is lightly screwed into the male screw 21 formed at one end of the rotating shaft 20. When the impeller nut 15 is screwed into the rotating shaft 20, the impeller 10 cannot be removed from the rotating shaft 20.

  Next, as shown in FIGS. 1 and 2, the jig attaching device 60 is attached to the impeller 10. At this time, first, the annular frame 61 of the jig mounting device 60 is arranged on the outer periphery of the impeller 10. Specifically, as shown in FIGS. 3 to 5, the inner peripheral surface 65 of the annular frame main body portion 62 and the outer peripheral surface 13 of the suction port side end portion 12 of the impeller 10 are opposed to each other. The flange portion 66 of the frame 61 is brought into contact with the suction port side end surface 14 in the rotation axis direction. Then, a plurality of press contact screws 72 of the jig mounting device 60 are screwed into the press contact body screw holes 64 of the frame 61 from the outer peripheral side, and pads 77 attached to the tip end portions of the respective press contact screws 72 are attached to the frame main body portion 62. It protrudes from the inner peripheral surface 65 and is pressed against the outer peripheral surface 13 of the suction port side end portion 12 of the impeller 10. As a result, the frame 61 and the impeller 10 of the jig mounting device 60 cannot be moved relative to each other due to the frictional force acting between the pad 77 of the jig mounting device 60 and the outer peripheral surface 13 of the impeller 10.

  Subsequently, as shown in FIGS. 1 and 2, the nut runner 41 is attached to the impeller nut 15 so that the rectangular head portion 18 of the impeller nut 15 is fitted into the nut-side fitting hole 42 of the nut runner 41. Next, the cylindrical nut runner 41 attached to the impeller nut 15 is inserted into the runner insertion hole 53 of the nut runner support plate 51. In this process, the flange portion 56 of the nut runner support plate 51 contacts the flange portion 66 of the frame 61 of the jig mounting device 60. Next, a jig mounting bolt 59 is inserted into the bolt hole 57 formed in the flange portion 56 of the nut runner support plate 51, and the jig mounting bolt 59 is inserted into the flange portion 66 of the frame 61. The nut runner support plate 51 is fixed to the frame 61 of the jig mounting device 60 by being screwed into the mounting screw hole 67 (jig mounting portion).

  Next, the output end 31 of the hydraulic wrench 30 is fitted into the wrench-side fitting hole 43 of the nut runner 41, and the casing 32 of the hydraulic wrench 30 is brought into contact with the reaction force receiving portion 55 of the nut runner support plate 51.

  Next, the hydraulic pump 35 (FIG. 2) connected to the hydraulic wrench 30 is operated to rotate the output end 31 of the hydraulic wrench 30, and the nut runner 41 with which the output end 31 is fitted is used. Then, the impeller nut 15 is rotated and the impeller nut 15 is firmly screwed into the rotary shaft 20.

  At this time, a reaction force in a direction opposite to the rotational torque applied by the hydraulic wrench 30 to the impeller nut 15 is applied to the reaction force receiving portion 55 of the nut runner support plate 51. For this reason, the rotational torque in the direction opposite to the rotational torque applied to the impeller nut 15 is applied to the jig attachment device 60 to which the nut runner support plate 51 is attached. For this reason, the jig mounting device 60 tries to rotate in the direction of this rotational torque, but acts between the pad 77 forming the tip of the pressure contact body 71 of the jig mounting device 60 and the outer peripheral surface 13 of the impeller 10. Does not rotate due to friction force.

  Then, after removing the hydraulic wrench 30, the work jig 40, and the jig mounting device 60 in order, the locking bolt 19 (FIG. 18) is inserted into the through hole 16 of the impeller nut 15, and the locking bolt 19 is rotated. Screw into the shaft 20. This completes the operation of attaching the impeller 10 to the rotating shaft 20.

  When removing the impeller 10 from the rotating shaft 20, first, the locking bolt 19 is removed from the rotating shaft 20. Next, the jig attaching device 60 is attached to the impeller 10 as described above. Further, as described above, the work jig 40 and the hydraulic wrench 30 are attached thereto.

  Next, the hydraulic pump 35 connected to the hydraulic wrench 30 is operated to rotate the output end 31 of the hydraulic wrench 30 in the direction opposite to that at the time of attachment, and the nut runner in which the output end 31 is fitted. The impeller nut 15 is rotated via 41 to loosen the impeller nut 15 that is firmly screwed into the rotary shaft 20.

  Then, after removing the hydraulic wrench 30, the work jig 40, and the jig attachment device 60 in order, the impeller nut 15 is completely removed from the rotary shaft 20, and the impeller 10 is removed from the rotary shaft 20. Thus, the work for removing the impeller 10 from the rotating shaft 20 is completed.

  As described above, in this embodiment, the work jig 40 can be attached to the impeller 10 even if the structure for fixing the jig is not formed in advance on the impeller 10 that is a rotating body. Therefore, according to the present embodiment, even if the structure for fixing the jig is not formed on the impeller 10 in advance, it is possible to relatively easily perform the attaching operation and the removing operation of the impeller 10 with respect to the rotating shaft 20.

"Second embodiment"
Next, a second embodiment of the impeller nut tightening device according to the present invention will be described with reference to FIGS.

  As shown in FIGS. 6 and 7, the impeller nut tightening device of the present embodiment also has a work jig 40 to which the hydraulic wrench 30 is attached and the work jig 40 attached to the impeller 10 as in the first embodiment. A jig mounting device 60a. The work jig 40 in the present embodiment is the same as the work jig 40 in the first embodiment, and the jig attachment device 60a in the present embodiment is different from the jig attachment device 60 in the first embodiment. Therefore, below, the jig | tool attachment apparatus 60a in this embodiment is mainly demonstrated.

  The jig mounting device 60a of the present embodiment includes an annular frame 61a that surrounds the outer periphery of the suction port side end portion 12 of the impeller 10, and the frame 61a. The end portion moves in the radial direction of the frame 61a and the impeller A plurality of press contact bodies 71a that can be press-contacted to the outer peripheral surface 13 on the suction port side, and a hydraulic pump 80 that hydraulically drives the press contact bodies 71a.

  Similar to the frame 61 of the first embodiment, the frame 61a includes an annular frame main body portion 62a and a flange portion 66 that protrudes from the annular frame main body portion 62a toward the inner peripheral side.

  As shown in FIGS. 8 to 10, the annular frame body 62 a has a groove 63 that is recessed from the inner peripheral side to the outer peripheral side, and a plurality of press contact body insertion holes 64 a that penetrate the groove 63 from the outer peripheral side. Is formed. The plurality of press contact body insertion holes 64a are formed at equal intervals in the circumferential direction of the annular frame main body 62a. In addition, a plurality of jig mounting screw holes 67 penetrating in the axial direction of the annular frame main body portion 62a are formed in the flange portion 66 as in the flange portion 66 of the first embodiment.

  The press contact body 71a has a hydraulic cylinder 72a. The hydraulic cylinder 72a is fixed to the cylinder casing 74a, a piston (not shown) that can reciprocate within the cylinder casing 74a, and protrudes from the cylinder casing 74a to one side in the reciprocating direction of the piston. A piston rod 73a. The pressure contact body 71a further includes a pad 77 and a stopper 79 attached to the tip of the piston rod 73a of the hydraulic cylinder 72a.

  The cylinder casing 74a of the hydraulic cylinder 72a is inserted into a portion closer to the outer peripheral side of the press contact member insertion hole 64a of the frame 61a and is fixed to the frame 61a. A cylindrical pad mounting portion 75 is formed at the tip of the piston rod 73a of the hydraulic cylinder 72a. The pad 77 is formed in a size that can be projected and retracted in the radial direction of the frame 61a with respect to the groove 63 of the frame 61a. Further, the pad 77 is formed with an insertion hole 78 that penetrates the groove 63 in the protruding and retracting direction and into which the pad mounting portion 75 of the hydraulic cylinder 72a is inserted. The stopper 79 has an outer diameter larger than the inner diameter of the insertion hole 78, and the pad mounting portion 75 of the hydraulic cylinder 72 a is inserted into the insertion hole 78 of the pad 77. The pad 77 is attached and restrained so as not to move relative to the piston rod 73a of the hydraulic cylinder 72a.

  The cylinder casings 74a of the plurality of hydraulic cylinders 72a are connected to the hydraulic pump 80 by hydraulic hoses 81, respectively.

  Next, the installation work and the removal work of the impeller 10 with respect to the rotating shaft 20 are demonstrated. The operation of attaching and removing the impeller 10 in this embodiment is basically the same as that of the first embodiment. However, since the configuration of the jig mounting device 60a is different from that of the first embodiment, the mounting method of the jig mounting device 60a to the impeller 10 is slightly different from that of the first embodiment.

  When attaching the jig attaching device 60a to the impeller 10, first, the annular frame 61a of the jig attaching device 60a is disposed on the outer periphery of the impeller 10 as in the first embodiment. Next, the hydraulic pump 80 is driven to apply hydraulic pressure to the hydraulic cylinders 72a of the plurality of press contact bodies 71a. When hydraulic pressure is applied to each hydraulic cylinder 72a, the piston rod 73a of each hydraulic cylinder 72a and the pad 77 attached thereto move, and this pad 77 is placed on the outer peripheral surface 13 of the inlet side end 12 of the impeller 10. Pressed. As a result, as in the first embodiment, the frame 61a and the impeller 10 of the jig mounting device 60a are relatively moved by the frictional force acting between the pad 77 of the jig mounting device 60a and the outer peripheral surface 13 of the impeller 10. It becomes impossible to move.

  As described above, also in the present embodiment, the work jig 40 can be attached to the impeller 10 even if the structure for fixing the jig is not formed on the impeller 10 in advance. Moreover, in this embodiment, since all the several press-contacting bodies 71a operate | move by driving the hydraulic pump 80, the jig | tool mounting apparatus 60a can be attached to the impeller 10 more easily than 1st embodiment. .

"Third embodiment"
Next, a third embodiment of the impeller nut tightening device according to the present invention will be described with reference to FIGS.

  Similarly to the above embodiments, the impeller nut tightening device of the present embodiment also has a work jig 40 to which a hydraulic wrench 30 is attached and the work jig 40 attached to the impeller 10 as shown in FIGS. And a jig mounting device 60b for mounting. The work jig 40 in this embodiment is also the same as the work jig 40 in the first embodiment, and the jig attachment device 60b in this embodiment is the jig attachment device 60, 60a in the first and second embodiments. Is different. Therefore, below, the jig | tool attachment apparatus 60b in this embodiment is mainly demonstrated.

  The jig mounting device 60b of the present embodiment includes an annular frame 61b that surrounds the outer periphery of the suction port side end portion 12 of the impeller 10, and the frame 61b. The end portion moves in the radial direction of the frame 61b, and the impeller A plurality of press contact bodies 71b that can be press-contacted to the outer peripheral surface 13 on the suction port side, and an air pressure generator 80b that drives the press contact bodies 71b by air pressure.

  Similar to the frames 61 and 61a of the first and second embodiments, the frame 61b includes an annular frame main body portion 62b and a flange portion 66 that protrudes from the annular frame main body portion 62b toward the inner peripheral side. .

  As shown in FIG. 13, the annular frame body 62b has a plurality of cylinder chambers 63b that are recessed from the inner peripheral side to the outer peripheral side, and air supply holes 64b that supply air from the outer peripheral side into the cylinder chamber 63b. Is formed. The plurality of cylinder chambers 63b of the frame main body 62a are all formed in a cylindrical shape. The flange portion 66 is formed with a plurality of jig mounting screw holes 67 penetrating in the axial direction of the annular frame main body portion 62b, like the flange portion 66 of the first and second embodiments.

  The pressure contact body 71b has a cylindrical piston 72b and an O-ring 73b attached to the outer periphery of the piston 72b. The cylindrical piston 72b is sized to be slidably received in a cylindrical cylinder chamber 63b formed in the frame 61b. With this piston 72b as a reference, air leaks from the air pressure chamber on the outer peripheral side in the cylinder chamber 63b through the space between the outer peripheral surface 13 of the piston 72b and the inner peripheral surface 65 of the cylinder chamber 63b. In order to prevent it from coming out, an O-ring 73b is provided as described above. The piston 72b is made of urethane rubber which is a kind of viscoelastic material.

  As shown in FIG. 14, the air pressure generation device 80 b includes a compressor 84 that generates compressed air and an air pressure adjusting device 85 that adjusts the pressure of the compressed air from the compressor 84. The air pressure adjusting device 85 includes a filter 86 that cleans the compressed air from the compressor 84, a regulator 87 that outputs the compressed air that has passed through the filter 86 to a target pressure, and an upstream side (primary side) of the regulator 87. When the pressure becomes a predetermined pressure or higher, the safety valve 88 that releases the compressed air from the compressor 84 to the outside and the silencer 89 are provided. A pneumatic hose 81 b is connected to the downstream side (secondary side) of the regulator 87. As shown in FIG. 13, the pneumatic hose 81b is connected to a plurality of air supply holes 64b of the frame 61b.

  Next, the installation work and the removal work of the impeller 10 with respect to the rotating shaft 20 are demonstrated. The operation of attaching and removing the impeller 10 in this embodiment is basically the same as in the first and second embodiments. However, since the configuration of the jig mounting device 60b is different from the first and second embodiments, the mounting method of the jig mounting device 60b to the impeller 10 is slightly different from the first and second embodiments.

  When attaching the jig attaching device 60b to the impeller 10, first, the annular frame 61b of the jig attaching device 60b is arranged on the outer periphery of the impeller 10 as in the first and second embodiments. Next, the air pressure generator 80b is driven to supply compressed air into the plurality of cylinder chambers 63b formed in the frame 61b. When compressed air is supplied into each cylinder chamber 63b, the distal end portion of the piston 72b protrudes from the inner peripheral surface 65 of the frame main body portion 62b, and this piston 72b is the outer peripheral surface 13 of the suction port side end portion 12 of the impeller 10. Pressed against. As a result, the frame 61b of the jig mounting device 60b and the impeller 10 cannot be moved relative to each other due to the frictional force acting between the piston 72b of the jig mounting device 60b and the outer peripheral surface 13 of the impeller 10.

  As described above, also in the present embodiment, the work jig 40 can be attached to the impeller 10 even if the structure for fixing the jig is not formed on the impeller 10 in advance. Also, in the present embodiment, as in the second embodiment, by driving the air pressure generating device 80b, all the plurality of press contact bodies 71b are operated, so that the jig mounting device is attached to the impeller 10 more than in the first embodiment. 60b can be easily attached.

  Further, in the present embodiment, the cylinder chamber 63b is formed in the frame 61b, and the piston 72b is inserted into the cylinder chamber 63b. Therefore, the number of parts can be reduced as compared with the first and second embodiments, and the The manufacturing cost of the tool mounting device 60b can be reduced. Further, in the present embodiment, since the piston 72b is moved by air pressure, a plurality of pistons 72b, even if the distance between the piston 72b and the outer peripheral surface 13 of the inlet side end 12 of the impeller 10 is different for each of the plurality of pistons 72b. Differences in the interval between the pistons 72b can be absorbed. Therefore, in this sense, also in the second embodiment, a pneumatic cylinder may be used instead of the hydraulic cylinder 72a, and a pneumatic generator may be used instead of the hydraulic pump 80.

  Furthermore, in this embodiment, since the piston 72b that is in contact with the outer peripheral surface 13 of the suction port side end portion 12 of the impeller 10 is formed of a viscoelastic material that is soft and has a high friction coefficient, the pressure contact body 71b and the impeller 10 The frictional force between the suction port side end 12 and the outer peripheral surface 13 can be increased, and damage to the outer peripheral surface 13 can be minimized. Therefore, also in the above-mentioned embodiment, you may form the part which contact | connects the outer peripheral surface 13 of the suction inlet side edge part 12 of the impeller 10 in a press-contacting body.

  Next, various modifications of the jig mounting device 60b in the third embodiment described above will be described.

  As shown in FIGS. 15 and 16, the first and second modified examples of the jig mounting device 60 b are modified examples of the piston that is a component of the jig mounting device.

  The pistons 72c and 72d of these modified examples each have columnar piston bodies 74c and 74d formed of urethane rubber, and reinforcing members 75c and 75d that reinforce the piston bodies 74c and 74d. Yes. The reinforcing members 75c and 75d of the pistons 72c and 72d are both cylindrical and are made of a metal such as stainless steel. Further, the end portions on the inner peripheral side of the frame 61b of the reinforcing members 75c and 75d are located on the outer peripheral side with respect to the end portions on the inner peripheral side of the piston main bodies 74c and 74d. This is to make all the portions of the pistons 72c and 72d that are in contact with the outer peripheral surface 13 of the suction port side end portion 12 of the impeller 10 made of rubber. The reinforcing member 75c of the first modified example is provided on the outer periphery of a cylindrical piston body 74c as shown in FIG. 15, and the reinforcing member 75d of the second modified example, as shown in FIG. It is provided inside the piston main body 74d.

  As described above, when the hydraulic wrench 30 attached to the work jig 40 is driven and rotational torque is applied to the impeller nut 15, the jig attachment device has a direction opposite to the rotational torque applied to the impeller nut 15. Rotational torque is applied. The rotational torque in the opposite direction acts as a shearing force in the radial direction of the piston 72b on the cylindrical piston 72b in the third embodiment.

  Therefore, in these modified examples, the strength against the shearing force acting on the pistons 72c and 72d is increased by providing metal reinforcing members 75c and 75d on the rubber piston main bodies 74c and 74d.

  Next, a third modification of the jig mounting device 60b in the third embodiment will be described with reference to FIG.

  In addition to the frame 61b and the piston 72e, the jig mounting device 60e of the present modification includes a coil spring 91 as a biasing member that biases the piston 72e toward the outer periphery of the frame 61b, and one end portion of the coil spring 91. A disk-shaped spring retainer 93 that comes into contact, and a cylindrical spring retainer 95 that comes into contact with the other end of the coil spring 91 are provided.

  The piston 72e has a large diameter portion 74e having a large outer diameter and a small diameter portion 75e having a small outer diameter with respect to the large diameter portion 74e. The piston 72e is housed in the cylinder chamber 63b so that the large diameter portion 74e side is positioned on the outer peripheral side of the frame 61b. Around the small diameter portion 75e, a spring receiver 93, a coil spring 91, and a spring retainer 95 are provided in order from the outer peripheral side of the frame 61b. A male screw 96 is formed on the outer periphery of the spring retainer 95. A female screw 97 is formed on the inner peripheral side of the frame 61b and on the inner wall of the cylinder chamber 63b. The spring retainer 95 is screwed into the female screw 97 of the cylinder chamber 63b and is fixed to the frame 61b.

  In this modification, when compressed air is supplied to the pneumatic chamber of the cylinder chamber 63b and the piston 72e protrudes further from the inner peripheral surface 65 of the frame main body 62b to the inner peripheral side, the coil spring 91 contracts. When the air pressure generating device 80b operates and the compressed air can be exhausted from the air pressure chamber, the piston 72e moves to the outer peripheral side of the frame 61b by the restoring force of the coil spring 91, returns to the original position, and the cylinder chamber 63b. The compressed air inside is exhausted. That is, in this modification, when the piston 72e protrudes from the inner peripheral surface 65 of the frame main body 62b and the compressed air can be exhausted from the pneumatic chamber, the piston 72e is immediately restored by the restoring force of the coil spring 91. It can be returned to the position.

  Therefore, in this modification, the jig attaching device 60e attached to the impeller 10 can be easily detached from the impeller 10 in a short time.

  Although the present modification is a modification of the third embodiment, the pistons 72c and 72d are biased toward the outer peripheral side of the frame 61b in the first and second modifications described above, as in the third modification. An urging member may be provided.

  Further, in each of the above-described embodiments and modifications, the work jig 40 used when attaching and removing the impeller 10 to and from the rotary shaft 20 is used as a jig attachment device in the impeller 10 as a rotating body. Although the example for attaching is illustrated, the jig attaching device according to the present invention is not limited to this, and can be applied to any case as long as it is desired to attach the work jig to any rotating body. . For example, the present invention can be applied to a case where a work jig used when attaching and removing a shaft seal to and from a rotating shaft is attached to a rotating shaft as a rotating body.

  1: Pump 1, 10: Impeller, 12: End of suction port side (of impeller), 13: Outer peripheral surface (of end of suction port of impeller), 15: Impeller nut, 20: Rotating shaft, 21: (Rotation) Male screw of shaft, 30: Hydraulic wrench, 31: Output end of (hydraulic wrench), 40: Work jig, 41: Nut runner, 42: Nut side fitting hole, 43: Wrench side fitting hole, 51: Nut runner Support plate, 53: runner insertion hole, 55: reaction force receiving portion, 57: bolt hole, 59: jig mounting bolt, 60, 60a, 60b, 60d: jig mounting device, 61, 61a, 61b: frame, 63 : Groove, 64: pressure contact body screw hole, 63b: cylinder chamber, 64a: pressure contact body insertion hole, 64b: air supply hole, 65: inner peripheral surface of (frame), 67: jig attachment screw hole (jig attachment portion) ), 71, 71a, 71b: pressure contact bodies, 72: Contact screw, 72a: hydraulic cylinder, 72b, 72c, 72d, 72e: piston, 73a: piston rod, 74a: cylinder casing, 75c, 75e: reinforcing member, 77: pad, 79: stopper, 80: hydraulic pump, 80b : Air pressure generator, 91: Coil spring (biasing member)

Claims (13)

In a jig mounting device that attaches a work jig to a rotating body that rotates around a rotation axis,
An annular frame that surrounds the outer periphery of the rotating body around the rotation axis and has a jig attachment portion for attaching the work jig;
A plurality of annular frames, which are provided at intervals in the circumferential direction of the frame, and whose end portions move in the radial direction of the frame and can be pressed against the outer peripheral surface of the rotating body,
A jig mounting device comprising: In the jig mounting apparatus according to claim 1,
In the annular frame, a plurality of cylinder chambers recessed from the inner peripheral side toward the outer peripheral side are formed, and fluid supply holes for supplying driving fluid from the outer peripheral side to the cylinder chamber are formed,
The pressure contact body is inserted into the cylinder chamber, and has a piston that can protrude and retract from the cylinder chamber to the inner peripheral side in the radial direction.
A jig mounting device characterized by that. In the jig mounting apparatus according to claim 2,
The portion including at least the inner peripheral surface of the piston is formed of a viscoelastic material.
A jig mounting device characterized by that. In the jig mounting apparatus according to claim 3,
The piston includes a piston body formed of the viscoelastic material, and a reinforcing member that increases the rigidity of the piston in a direction perpendicular to the moving direction of the piston.
A jig mounting device characterized by that. In the jig mounting apparatus according to any one of claims 2 to 4,
An urging member that urges the piston that has moved from the cylinder chamber to the inner peripheral side toward the outer peripheral side;
A jig mounting device characterized by that. In the jig mounting apparatus according to claim 1,
The annular frame is formed with a plurality of screw holes penetrating from the outer peripheral side to the inner peripheral side,
The press contact body has a press contact screw that can be screwed into the screw hole.
A jig mounting device characterized by that. The jig mounting device for a rotating body according to claim 6,
The press contact body includes the press contact screw, and a pad attached to a distal end portion of the press contact screw and capable of press contact with the outer peripheral surface of the rotating body.
A jig mounting device for a rotating body characterized by the above. In the jig mounting apparatus according to claim 1,
The press contact body has a fluid pressure cylinder,
The fluid pressure cylinder includes a cylinder casing, a piston capable of reciprocating in the cylinder casing, a piston rod fixed to the piston and projecting from the cylinder casing to one side in the reciprocating direction of the piston; Have
The annular frame is formed with a plurality of press contact body insertion holes penetrating from the outer peripheral side to the inner peripheral side,
The cylinder casing of the fluid pressure cylinder is fixed to the frame so that the piston rod is inserted into the pressure contact body insertion hole and faces the inner peripheral side,
A jig mounting device characterized by that. In the jig mounting apparatus according to claim 8,
The pressure contact body includes the fluid pressure cylinder, and a pad attached to a tip end portion of the piston rod of the fluid pressure cylinder and capable of pressure contact with the outer peripheral surface of the rotating body.
A jig mounting device characterized by that. In the jig mounting apparatus according to claim 7 or 9,
A jig mounting apparatus, wherein at least a portion of the pad including a surface on the inner peripheral side is formed of a viscoelastic material. In the jig mounting apparatus according to claim 3 or 10,
The viscoelastic material is rubber.
A jig mounting device characterized by that. In the jig mounting apparatus according to any one of claims 1 to 11,
The rotating body is an impeller in which a through hole passing through the rotation axis is formed,
The work jig is
A jig in which a fluid pressure wrench for screwing an impeller nut into one end portion is attached in a state where one end portion of a rotating shaft is inserted into the through hole of the impeller,
A nut runner in which a nut-side fitting hole in which the impeller nut is fitted so as not to be relatively rotatable, and a wrench-side fitting hole in which an output end of the fluid pressure wrench is fitted so as not to be relatively rotatable, are formed;
A reaction force receiving portion that receives a reaction force of the fluid wrench, in which the output end is fitted in the wrench side fitting hole, and an end portion of the nut runner on which the wrench side fitting hole is formed are relatively rotated. A runner insertion hole through which insertion is possible, and a nut runner support plate in which a bolt hole into which a jig mounting bolt is inserted is formed;
Have
The jig mounting portion of the frame is a jig mounting screw hole into which the jig mounting bolt inserted into the bolt hole of the nut runner support plate is screwed.
A jig mounting device characterized by that. A jig mounting device according to claim 12,
The work jig;
An impeller nut tightening device characterized by comprising:

Images