JP2001009747A - Mounting and demounting jig of lock nut for coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely, easily and speedily mount and demount a coupling lock nut for a large pump motor. SOLUTION: This jig inserts a coil spring 3 into a center guide rod 2 by erecting the center guide rod 2 on a movable base 1. A nut receiver 5 is seated on an upper end of the coil spring 3, and a nut engagement part 4 is formed on its upper surface. Thereafter, a handle 6 for lock nut rotation is provided on the nut receiver 5. Additionally, a plural number of hanging bolts 8 are erected and fixed at equal distances from the center guide rod 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupling for connecting a large pump used in a power plant or the like and a large motor thereof, and a coupling for attaching and detaching a coupling flange on the motor side to a rotary shaft. The present invention relates to a device for attaching and detaching a lock nut for fixing a ring.

[0002]

2. Description of the Related Art A vertical coupling for a large pump motor is formed as shown in FIG. 3 as an example. That is, the rotating shaft protruding downward from the center of the motor casing 22
The coupling 14 is detachably attached to the lower end of 18,
A lock nut 15 is screwed to the lower end of the rotating shaft 18. The coupling 14 and the flange 24 of the pump drive shaft 23 on the pump side are fastened via coupling bolts 25. The coupling 14 has a recess on the lower surface.
The lock nut 15 is inserted into the recess 17 and screwed to the lower end of the rotating shaft 18. An engagement hole for rotating the lock nut is provided on the lower surface of the lock nut 15.
26 are provided. A center hole 21 is formed in the center of the rotating shaft 18. Such a coupling 14
Are removed and inspected and maintained during periodic inspections. that time,
First, the lock nut 15 is removed, then the coupling
14 is removed. When the coupling 14 is removed, the outer circumference is heated by a burner and the inner diameter is enlarged by thermal expansion. Conversely, when the coupling 14 is mounted on the rotating shaft 18, the coupling 14 is heated and mounted.

Conventionally, to remove the lock nut 15, four workers put a cart under the lock nut 15 inside a vertical motor and rotate the lock nut 15 with a relatively simple jig. I had to put on and take off. The lock nut 15 has a weight of about 80 kg as an example, and has to be carefully attached and detached.

[0004]

The conventional lock nut removal jig is relatively simple, and its handling requires skill. In addition, when the heavy lock nut comes off, it may fall and injure the worker. When installing the lock nut, lock nut 15
It is not easy to screw horizontally to the tip of the rotating shaft 18 while maintaining the horizontal position. Then, this invention makes it a subject to solve such a problem.

[0005]

According to the present invention, there is provided a movable base, a center guide rod having a lower end fixed to the center of the base and standing upright. A coil spring 3 inserted through the center guide rod 2, a nut receiver 5 seated on the coil spring 3, and having a nut engaging portion 4 made of a pin or a bolt protruding from an upper surface thereof;
The nut receiver 5 is provided with a handle 6 for rotating the nut receiver protruding in the radial direction and an equal distance from the center guide rod 2, and a lower end is fixed to the base 1 and is erected. And a suspension bolt 8 having an external thread 7 formed in a portion thereof.

According to a second aspect of the present invention, there is provided the spring pressure adjusting member according to the first aspect, which is screwed to the outer screw 2a at the lower end of the center guide rod 2 and moves up and down in the axial direction.
And a spring receiver 10 supported or mounted on the spring pressure adjusting member 9 and seated on the lower end of the coil spring 3. The present invention described in claim 3 is:
3. A jig for mounting and removing a lock nut for coupling according to claim 1 or 2, wherein a moving caster 11 protrudes from a lower surface of the base 1.

[0007]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway elevational view of the jig of the present invention.
Is shown on the nut receiver 5, and FIG. 2 is a schematic perspective view thereof. In this jig, a caster 11 is provided on the lower surface of a substantially square base 1 to form a bogie. The lower end of the center guide rod 2 is fixed to the center of the base 1 by welding, and is vertically raised. The front end of the center guide rod 2 is slightly thinned, and an outer thread 2a is formed at the lower end. A spring pressure adjusting member 9 is screwed to the outer screw 2a, and ends of a pair of pressure adjusting handles 12 are fixed to the spring pressure adjusting member 9 by welding. Then, the spring receiver 10 is placed on the spring pressure adjusting member 9, and the spring receiver 10 moves up and down as the spring pressure adjusting member 9 moves up and down.

Next, the lower end of the coil spring 3 inserted into the center guide rod 2 is seated on the spring receiver 10. A nut receiver 5 is seated on the upper end of the coil spring 3. The nut receiver 5 has a hole at the center, and a small-diameter cylinder 5a protrudes from the hole. The inner diameter of the small-diameter cylinder 5 a is formed slightly larger than the outer circumference of the center guide rod 2. Further, on the lower surface of the nut receiver 5,
A large-diameter cylinder 5b having an inner diameter larger than the outer diameter of the coil spring 3 is protruded. And the large-diameter cylinder 5b
, A pair of handles 6 are fixed by welding. In this example, the handle 6 is formed in a round bar shape. However, to make the handle 6 more robust, a relatively thick elongated metal plate may be fixed to the outer periphery of the large-diameter cylinder 5b by welding. Next, in this example, a pin-shaped nut locking portion 4 is projected from the upper surface of the nut receiver 5.
This nut locking portion 4 is aligned with the engagement hole 26 of the lock nut 15. The engagement hole 26 may be a pin insertion hole or a bolt insertion hole. In case of bolt insertion hole,
A bolt hole corresponding to the hole is drilled in the nut receiver 5, and the lock nut 15 and the nut receiver 5 can be locked by mounting a bolt there.

Next, four suspension bolts 8 shown in FIG. 2 are erected and fixed at equal distances from the center guide bar 2 on the base 1. That is, the lower end of the suspension bolt 8 is fixed to the base 1 by welding. The position of each suspension bolt 8 is a position that matches a bolt hole formed in the flange portion of the coupling 14. In this example, they are erected at positions 90 ° apart from each other in the circumferential direction around the center guide rod 2. An external screw 7 is provided at the upper end of the suspension bolt 8.
Are formed, and a pair of fastening nuts 13 are screwed therein as shown in FIG. 1, and a spacer 16 is inserted between them. Further, in this example, eyebolts 27 are provided at the four corners of the upper surface of the base 1.
Has been fixed. The eye bolt 27 is used as a lifting ring when lifting the entire jig.

[0010]

[How to use] Next, a method of using this jig will be described. First, to remove the lock nut 15 and the coupling 14 for a periodic inspection or the like, the following is performed. In this example, the entire large vertical pump motor is removed from the installation location by a huge crane, and is mounted on a suitable mount. At this time, the rotating shaft 18 and the coupling 14 are mounted so as to protrude below the motor casing 22. Therefore, the entire jig is moved below the rotation shaft 18 and the coupling 14,
Insert it. Then, one fastening nut 13 is screwed onto the outer screw 7 of each suspension bolt 8, and a spacer 16 is fitted on the upper part of the fastening nut 13. Next, the entire jig is raised by an appropriate jack or hanging tool, the tip of the center guide rod 2 is inserted into the center hole 21 of the rotating shaft 18, and each hanging bolt 8 is bolted to the flange of the coupling 14. Then, a fastening nut 13 is screwed to the upper end of the external screw 7. Then, pressure adjustment handle 12
Is rotated so that the upper surface of the nut receiver 5 presses the lock nut 15, and the nut locking portion 4 of the nut receiver 5 is fitted into the engagement hole 26 of the lock nut 15.

Next, the handle 6 is rotated, and the lock nut 15 is loosened from the tip of the rotating shaft 18 accordingly. At this time, the handle 6 is hit with a hammer or the like only at the beginning. Next, when the lock nut 15 is slightly loosened, the operator rotates the handle 6 so that the lock nut 15 can be relatively easily removed from the rotating shaft 18. When the lock nut 15 is completely removed from the tip of the rotary shaft 18, the load (for example, about 80 kg) is applied to the nut receiver 5, but the load is safely and elastically supported by the coil spring 3. You. When the lock nut 15 is removed from the rotary shaft 18, the fastening nut 13 at the upper end of the suspension bolt 8 is removed while the entire jig is lifted by a jack or the like. The entire jig is then moved down, separated from the motor and moved to another location. Next, the coupling 14 is supported by a chain block or the like using a bolt hole in the flange portion of the coupling 14. Next, the outer periphery of the coupling 14 is heated by a burner or the like and thermally expanded. Then, the coupling 14 is pulled out from the rotating shaft 18, moved to another place, and the coupling 14 and the lock nut 15 are inspected and maintained respectively.

Next, the coupling 14 and the lock nut 15
Can be attached in the reverse order. In particular,
When attaching the lock nut 15 to the tip of the rotating shaft 18, the pressure adjusting handle 12 is rotated to adjust the upper surface of the lock nut 15 to contact the tip of the rotating shaft 18 with an appropriate pressure.
Then, the opening edge of the inner screw of the lock nut 15 is uniformly pressed against the tip of the outer screw of the rotating shaft 18. Then, by rotating the handle 6 next, the lock nut 15 is
It is screwed smoothly to the tip of 18.

[0013]

According to the first aspect of the present invention, the nut receiver 5 is seated on the coil spring 3 and the handle 6 of the nut receiver 5 is rotated so that the lock nut can be attached and detached. There is a lock nut 15 which is added to the nut receiver 5 when removing the lock nut.
Is elastically received by the coil spring 3,
Work safety can be ensured. The invention according to claim 2 is
Since the spring receiver 10 can be moved up and down in the axial direction by the spring pressure adjusting member 9, the elasticity of the nut receiver 5 by the coil spring 3 can be adjusted. Thereby, an appropriate pressing force is applied at the time of screwing when the lock nut 15 is mounted, so that the lock nut 15 can be smoothly mounted on the lower end of the rotating shaft 18. According to the third aspect of the present invention, since the casters 11 project from the lower surface of the base 1, the entire jig can be easily moved and transported, and the entire jig can be reduced in weight. .

[Brief description of the drawings]

FIG. 1 shows the mounting and installation of a lock nut for coupling of the present invention.
The elevation view in partial longitudinal section of a removal jig.

FIG. 2 is a schematic perspective view of the jig.

FIG. 3 is an explanatory view showing an attached state of the coupling 14 and the lock nut 15 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 2 Center guide rod 2a Outer screw 3 Coil spring 4 Nut locking part 5 Nut receiver 5a Small diameter cylinder 5b Large diameter cylinder 6 Handle 7 External screw 8 Hanging bolt 9 Spring pressure adjusting member 10 Spring receiver 11 Caster 12 Pressure adjustment handle 13 Fastening nut 14 Coupling 15 Lock nut 16 Spacer 17 Depressed portion 18 Rotating shaft 19 Key 20 Key groove 21 Center hole 22 Motor casing 23 Pump drive shaft 24 Flange 25 Coupling bolt 26 Engagement hole 27 Eye bolt

Claims (3)

[Claims] 1. A movable base 1, a center guide rod 2 having a lower end fixed to the center of the base 1 and standing upright, a coil spring 3 inserted through the center guide rod 2, A nut receiver 5 which is seated on the coil spring 3 and has a nut engaging portion 4 made of pins or bolts protruding from the upper surface.
A nut receiving rotation handle 6 protruding in the radial direction on the nut receiver 5, and the nut guide 5 is positioned at an equal distance from the center guide rod 2, and has a lower end fixed to the base 1. And a suspension bolt 8 having an outer thread 7 formed at an upper end thereof. A jig for mounting / removing a lock nut for coupling, comprising: 2. A spring pressure adjusting member 9 which is screwed to an outer screw 2a at a lower end portion of the center guide rod 2 and moves up and down in the axial direction, and is supported or attached to the spring pressure adjusting member 9. And a spring receiver 10 on which the lower end of the coil spring 3 is seated. 3. A jig for mounting and removing a lock nut for coupling according to claim 1 or 2, wherein a caster for movement 11 protrudes from a lower surface of the base 1.