JP3316370B2 - Shaft alignment adjustment method and device for large motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a primary coolant pump (RCP) for a nuclear power plant.
nt Pump), a circulating water pump, or a large pump such as a cooling water pump of a thermal power plant, and a large motor shaft alignment adjustment method performed during coupling work of a large motor driving the large pump, and the method is implemented. Device for

[0002]

2. Description of the Related Art When an output shaft of a motor and a rotary shaft of a driven device such as a pump driven by the motor are connected to each other, a shaft joint of the output shaft and the rotary shaft is arranged on the same axis. It is necessary to prevent vibrations due to rotation from occurring. FIG. 3 is a diagram showing an RCP for transmitting the absorbed thermal energy to a secondary working medium that absorbs thermal energy generated in the nuclear reactor and generates electric power, and a motor for driving the RCP.

In the figure, 21 is an RCP, 22 is an RCP
A motor stand which is connected to a pump flange 30 welded to 21 by a casing bolt 27 and is fixed to the RCP 21, 23 is a large motor for driving the RCP 21, and 28 is a motor support fixed to the lower end of the large motor 23.
Which is the motor flange. Thus, in order to connect the RCP 21 and the large motor 23 via the motor stand 22 and the motor flange 28 fixed respectively,
Output shaft 32 of large motor 23 and rotation shaft 33 of RCP 21
Must be arranged on the same axis, and both shafts 32 and 33 must be connected by a connecting flange 31.

For this reason, the RC fixed on the mounting base is
Lift the large motor 23 placed above P21,
After performing so-called alignment adjustment for adjusting the rotation axis 23 axis of the RCP 21 and the output axis 32 axis of the large-sized motor 23 to be arranged on the same axis, the motor stand on which the alignment adjustment has been performed. A liner plate is inserted between the motor 22 and the motor flange 28 to maintain the adjusted postures of the RCP 21 and the motor 23,
A coupling flange 31 provided at an end of a rotating shaft 33 of the rotary shaft 21 and a coupling flange 3 provided at an end of an output shaft 32 of the large-sized motor 23
1 and is fixed.

Usually, the lifting of the large motor 23, which is necessary for the alignment adjustment performed in this manner,
On the outer peripheral edge of the motor flange 28, three or more threaded grooves are provided vertically at equal pitches, and a jack bolt 29 is screwed into the threaded groove, and a lower end of the jack bolt 29 is formed on the motor stand 22. The reaction force from the end surface lifts the large motor 23 and adjusts the screwing amount of the jack bolt 29 to perform the alignment adjustment.

However, such a jack bolt 29
In order to perform the alignment adjustment by manipulating the large motor 23, when the weight of the large motor 23 is small, the large motor
It is almost impossible to lift. For this reason, it is conceivable to operate the jack bolts 29 with hydraulic pressure or the like. However, as shown in the figure, the space between the motor stand 22 and the large motor 23 where such jack bolts 29 are provided is small, and a hydraulic wrench It is very difficult to use such tools.

For this reason, as shown in FIG. 4, the heads of a plurality of casing bolts 27 which are inserted at equal pitches into the outer peripheral edge of the flange 30 fixed to the RCP 21 and which connect the motor stand 22 to the RCP 21 A gate-shaped jack support 24 is installed on the bottom plate of the motor stand 22 from which the hydraulic jack 25 protrudes. A hydraulic jack 25 is installed on the jack support 24, and the rod end of the hydraulic jack 25 and the lower end surface of the motor flange 28 are connected to each other. In the meantime, the extension rod 26 is inserted, pressure oil is introduced into the hydraulic jack 25, and the large motor 23 is lifted via the extension rod 26.

However, in the apparatus for lifting the large motor 23 in this manner, the jack support 24, the hydraulic jack 25, and the extension rod 26 provided between the motor stand 22 and the motor flange 28 are quite heavy. Therefore, labor is required for the transportation and installation, and the work of jacking up heavy objects using the long extension rod 26 is performed, resulting in an unstable work and a problem that a safety problem occurs.

Further, it has been conventionally performed to lift the large motor 23 with a crane facility and adjust the shaft coupling alignment. However, the large motor 23 is lifted using a crane facility using a polar crane or the like. When raising,
Since it is a heavy lifting work, preparation, installation,
It takes time for removing and clearing work, which increases the number of man-hours, and causes a problem that the crane equipment needs to be held during use time adjustment. In particular, like RCP21,
Spending time on axis alignment adjustment of a large motor that drives a driven device installed in a section with a large radiation dose also causes a new problem that increases the exposure dose.

[0010]

SUMMARY OF THE INVENTION As described above, the present invention relates to the configuration of the present invention in which the axis of the output shaft of a large-sized large motor and the axis of rotation of a driven device such as a pump driven by the large motor are rotated. A motor flange fixed to a large motor to eliminate the problem that has occurred when lifting a large motor above a driven device in alignment adjustment of the shaft, which is performed when coupling and arranging on the same shaft, Alternatively, a hydraulic cylinder is interposed between a motor support such as a motor base plate and a motor stand fixed to a driven device to support a large motor above, and a rod lower end of the hydraulic cylinder is provided from a bottom surface of the motor support. And a large motor is lifted up by pressing the upper end of the motor stand to perform the alignment adjustment. And to provide a large motor shaft alignment adjusting device for use in the method.

[0011]

For this reason, the method for adjusting the shaft alignment for a large motor according to the present invention employs the following means.

(1) In order to install a large motor above the driven device, a motor flange fixed to the large motor or a peripheral portion of a motor supporting member such as a motor base plate is used.
The through hole of the plurality of spiral grooves such as drilled vertically, the outer periphery
A process of fitting the surface and screwing the hydraulic cylinder in the vertical direction.

[0013] (2) by introducing the pressure oil to the hydraulic cylinder,
The lower end of the rod that moves up and down in the hydraulic cylinder projects downward from the bottom surface of the motor support member into which the hydraulic cylinder is screwed, and is connected to the large motor so as to face the motor support member above the driven device, Abut the upper surface of the motor stand fixed to the driven device, lift the large motor upward by the reaction force of the contact part, change the relative attitude between the driven device and the large motor, and adjust the axis alignment. Steps to perform.

[0014] (3) the axis of the output shaft of the large motors, the axial center of the rotary shaft of the driven device is disposed coaxially in a state in which the so-called alignment adjustment is performed, the motor support member A step of inserting a liner plate into a gap formed between the bottom surface and the upper surface of the motor stand to maintain the relative posture of the large motor and the driven device in that state.

(A) In the method for adjusting the shaft alignment for a large motor according to the present invention, high pressure oil pressure is introduced into the hydraulic cylinder even when the weight of the large motor becomes several tens ton by adopting the above-described process. Can be easily lifted. Further, by controlling the individual hydraulic pressures introduced into each of the plurality of hydraulic cylinders screwed into the peripheral portion of the motor support member, it is possible to arbitrarily change the attitude of the large motor to be lifted with respect to the driven device. Is possible and fine adjustment is easy, so that the relative attitude between the large motor and the driven device fixed on the
The axis between the output shaft of the large motor and the rotation axis of the driven device is
Alignment adjustment on the same axis can be easily performed.

Also, since a plurality of hydraulic cylinders for lifting the large motor are arranged on the peripheral portion of the motor support member, they may be small, may be provided close to each other, and cannot use a hydraulic tool such as a hydraulic wrench. It can be installed in a narrow space, and its transportation and installation are easy. Furthermore, to lift the large motor, it protrudes from the bottom of the motor support,
The stroke of the rod of the hydraulic cylinder may be very small, and the lifting force is not transmitted via a long member. Therefore, the work does not become unstable during work, and work safety can be ensured.

The hole for screwing the hydraulic cylinder into the peripheral portion of the motor supporting member can use a conventionally used jack bolt hole, and even when lifting an existing large motor, a new machining is required. There is no. In addition, since it is not necessary to use a crane or the like to lift a large motor, work time can be reduced, and hand-held time for time zone adjustment is eliminated, and axis alignment adjustment can be completed in a short time. In the case where work is performed around the furnace, the exposure dose can be reduced. The shaft alignment adjusting device for a large motor of the present invention employs the following means.

(11) A screw engraved on the outer peripheral surface of the cylinder for introducing the pressure oil is vertically fixed to the outer peripheral edge of the motor supporting member fixed to the large motor for installation above the driven device. A hydraulic cylinder is provided in which a plurality of screw grooves are respectively screwed and attached, and the lower ends of rods formed in an arc shape are individually projected downward from a plurality of locations on the bottom surface of the outer periphery of the motor support. Was.

[0019] (12) threaded on the outer peripheral portion of the motor support member, to supply the pressure oil within each of the plurality of hydraulic cylinders, by lifting the rod in the hydraulic cylinder, the lower end
Part is projected downward from the motor support member outer peripheral bottom surface, provided with a hydraulic device which is adapted to control the amount of projection of the rod.

[0020] (13) for coupling to a large motor driven device, to face the motors support abuts against the upper end of the motor stand is fixed above the driven device, downwardly from the bottom surface of the motor supporting member The upper surface of the hydraulic cylinder protruding from the upper surface engaging with the lower end of the rod is formed into an arc-shaped concave surface corresponding to the shape of the lower end of the rod, and is engaged with the upper surface of the motor stand.
A seat plate having a bottom surface formed thereon was pivotally attached to the lower end of the rod.

(14) The seat plate pivotally attached to the lower end of the rod of the hydraulic cylinder abuts on the upper end of the motor stand, and the large motor is lifted by the reaction force of the seat plate. When the axis of the rotating shaft is aligned on the same axis and the alignment is adjusted, it is inserted into the gap formed between the bottom of the motor support and the top of the motor stand. A liner plate for maintaining the relative attitude between the motor and the driven device is provided.

(B) In the shaft alignment adjusting device for a large motor according to the present invention, the same actions and effects as those of the above (a) can be obtained by the above-mentioned means.

Also, the lower end of the rod has a hemispherical shape, and a seat plate having an upper surface for receiving the lower end of the rod having a hemispherical concave surface having the same shape as the lower end of the rod is provided so as to be pivotally attached to the lower end of the rod. , The compressive stress distribution of the rod and the motor stand can be made uniform.

Further, as described in (a), a small and lightweight hydraulic cylinder can be employed, so that a commercially available manual oil pump can be employed as a hydraulic device for lifting a large motor in combination.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a shaft alignment adjusting device for a large motor according to the present invention will be described below with reference to the drawings. FIG. 1 is an overall view showing a first embodiment of a shaft alignment adjusting device for a large motor according to the present invention, and FIG. 2 is a sectional view showing details of the hydraulic cylinder shown in FIG. In these drawings, the same members as those shown in FIGS. 3 and 4 are denoted by the same reference numerals, and description thereof will be omitted.

In the drawing, reference numeral 1 denotes a screw 1 engraved on the outer peripheral surface.
2 is screwed into a screw groove 11 formed at an equal pitch on the outer peripheral edge of the motor flange 28, and is formed of three or more hydraulic cylinders vertically disposed on the outer peripheral edge of the motor flange 28. The oil pump 3 constitutes a hydraulic device together with the manual oil pump 2 and is a hydraulic hose for sending high-pressure oil generated by the manual oil pump 2 into a hydraulic cylinder. The hydraulic hose 3 is constituted by a plurality of hydraulic hoses 3 which are branched by a branch pipe connected to the discharge port of the manual oil pump 2 and communicate with each of the plurality of hydraulic cylinders 1.
Is provided with a valve 4 for controlling the amount of pressure oil supplied to the hydraulic cylinder 1. The joint 13 shown in FIG. 2 is connected to the tip of the hydraulic hose 3.

Next, as shown in FIG. 2, the hydraulic cylinders 1 are arranged at equal pitches on the outer peripheral edge of the motor flange 28 and are vertically penetrated. A cylinder 5 having a screw 12 screwed into the outer peripheral surface thereof, a cover 6 attached to the upper end of the cylinder 5 with bolts 18, a piston 7 which strokes in the cylinder 5, an upper end fixed to the piston 7, and a motor flange 28. And a rod 8 whose lower end is formed in an arc shape, and a seat plate 10 which is in contact with the lower end of the rod 8 at a spherical seat and is attached to the lower end of the rod 8 by a pin 9 so as to be slightly rotated.

The cover 6 has the above-described joint 13 for connecting the hydraulic hose 3 screwed into an upper outer portion, and supplies the cylinder 5 with pressure oil supplied from an opening into which the joint 13 is screwed. An oil drain hole 14 is opened inside. At the lower end of the cylinder 5, air is sucked below the piston 7 during the stroke of the piston 7,
A vent hole 15 for discharging is provided.

The hydraulic cylinder 1 configured as above is
Maximum operating pressure 700 kg / cm ² g, output 12 ton /
Table, piston stroke 10mm, fulcrum average surface pressure Max
17 kg / mm ² and the lower end of the rod 8
And the radius R of the spherical seat provided on the upper surface of the seat plate 10 is
The size is determined according to the diameter of the motor flange 28, and is manufactured so that the large motor 23 weighing 38 tons can be lifted.

As described above, since the shaft alignment adjusting device for a large motor according to the present embodiment is configured, the hydraulic oil pressurized by the manual oil pump 2 is supplied to the hydraulic hose 3 and the joint 1.
3. Introduced into the cylinder 15 through the oil supply / drain hole 14,
By pushing down the piston 7, the lower end of the rod 8, that is, the seat plate 10 is brought into contact with the upper surface of the motor flange 28 and pressed, and the large motor 23 is pushed up by the reaction force. When the large motor 23 is pushed up, that is, as shown in FIG. 2, the flow of the pressure oil when the gap 16 is formed between the upper surface of the motor stand 22 and the bottom surface of the motor flange 28, , And the flow of air in the vent hole 15 is as shown by arrows.

In this manner, the large motor 23 is lifted, and the control valve 4 interposed in the hydraulic hose 3 is operated, so that three or more three motors are arranged at equal pitches on the outer peripheral edge of the motor flange 28. By controlling the amount of pressure oil introduced into each of the hydraulic cylinders 1, the attitude angle of the large motor 23 with respect to the RCP 21 fixed on the installation base is changed, and the output shaft 32 of the large motor 23 and the rotation shaft 33 of the RCP 21 are changed. The alignment is adjusted so that the axes of are aligned on the same axis.

That is, by simultaneously pressing a plurality of hydraulic cylinders 1 arranged at equal intervals on the outer peripheral edge of the motor flange 28, the large motor 23 is pushed up, and the specific operation is performed by operating the control valve valve 4. When the pressure oil in the hydraulic cylinder 1 is reduced or discharged, the large motor 23
Is lowered by its own weight, the motor flange 28 is seated on the motor stand 22, and the piston is pushed up. In the alignment adjustment of the shaft coupling, the motor flange 2 is usually used.
In many cases, only the side on which the liner plate 17 is to be inserted is pushed up.
This can be done by selecting the push-up direction with.

At the time of alignment adjustment, the contact surface between the motor flange 28 and the motor stand 22 is inclined. However, the sliding of the spherical surface formed between the lower end of the rod 8 of the hydraulic cylinder 1 and the upper surface of the seat plate 10 occurs. Works effectively,
The contact surface pressure between the motor stand 23 and the seat plate 8 can be made uniform, and there is no possibility of causing damage such as local yield to both contact surface materials.

At the time when the alignment of the output shaft 32 and the rotating shaft is aligned on the same line, the gap 16 formed between the upper surface of the motor stand 22 and the lower surface of the motor flange 28 is adjusted. By inserting the liner plate 17, the large motor 23 and the RCP 21
The relative posture in which the alignment has been adjusted is maintained. Thereafter, the motor stand 22 and the motor flange 28 are
While fixing with the mounting bolt, the rotating shaft 3 of the RCP 21
3 and the output shaft 32 of the large motor 23
By this, the joint of the RCP 21 and the large-size 23 is completed.

Although the shaft alignment adjusting device for a large motor according to the present embodiment has been described above, the present invention is not limited to the above-described embodiment. The present invention can also be applied to jack-up performed at the time of alignment work or the like.

[0036]

As described above, according to the shaft alignment adjusting method and apparatus for a large motor according to the present invention, the configuration described in the claims makes it possible (1) to be lightweight, compact, and easy to transport, mount, and remove. . (2) The operation is simple and can be performed in a short time, that is, the working time and the exposure dose are reduced. (3) Conventional unsafe elements are eliminated. (4) Equipment can be procured at low cost. (5) The piston rod and the bearing surface of the motor stand are locally yielded and are not damaged. With such advantages, it is possible to carry out lifting of a large motor of several tens of tons or fine adjustment to perform axis alignment adjustment.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of a shaft alignment adjusting device for a large motor according to the present invention;

FIG. 2 is a sectional view showing details of the hydraulic cylinder shown in FIG. 1;

FIG. 3 is a diagram showing a combined state of a large motor and a primary coolant pump (RCP), and a conventional large motor lifting device;

FIG. 4 is a diagram showing another example of a conventional large motor lifting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic cylinder 2 Manual oil pump 3 Hydraulic hose 4 Control valve 5 Cylinder 6 Cover 7 Piston 8 Rod 9 Pin 10 Seat plate 11 Screw groove 12 Screw 13 Joint 14 Oil supply / drain hole 15 Vent hole 16 Gap 17 Liner plate 18 Bolt 21 RCP (Primary coolant pump) 22 Motor stand 23 Large motor 24 Jack support 25 Hydraulic jack 26 Extension rod 27 Casing bolt 28 Motor flange 29 Jack bolt 30 Pump flange 31 Coupling flange 32 Large motor output shaft 33 RCP rotation shaft

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02K 5/00 F16D 1/06 F16D 1/12 F16M 7/00

Claims (2)

(57) [Claims] 1. A large motor shaft alignment adjusting method for adjusting the alignment of a joint of a large motor and a driven device driven by the large motor, the method comprising: A plurality of hydraulic cylinders are inserted into through holes drilled vertically in the outer peripheral
A step of their respective threaded viewed fix the hydraulic cylinder
Lowered within the hydraulic cylinder by hydraulic fluid introduced into the inner
And a rod lower end protruding from the bottom surface of the motor support member.
At the upper end of the motor stand fixed to the driven device.
Brought into contact lifting the large motor, wherein changing the relative orientation of the driven device and the large motor, and performing the alignment adjustment, and the motor support material after the alignment adjustment, between the motor stand Inserting a liner plate into the gap formed in the shaft to maintain the alignment adjustment state. 2. A large motor shaft alignment adjusting device for adjusting the alignment of a shaft coupling between a large motor and a driven device driven by the large motor, wherein a screw engraved on the outer peripheral surface of the cylinder is provided. The lower end of the arc-shaped rod is independently attached to the outer peripheral edge of the motor supporting member fixedly attached to the large-sized motor from a plurality of locations on the bottom surface of the outer peripheral edge. Hydraulic cylinders projecting downward, and pressurized oil are supplied to each of the hydraulic cylinders to move the rod to the hydraulic cylinder.
The lock from the bottom of the outer peripheral edge.
A hydraulic device for controlling the amount of projection of de arcuate concave surface engaging said rod lower end to the upper surface is formed on the upper surface, it is pivotally connected to the rod lower part, of the motor stand secured to the driven device A seat plate having an engagement surface abutting on an upper surface formed on a bottom surface, and introduction of pressurized oil from the hydraulic device to the hydraulic cylinder, so that a bottom surface of the motor support member and an upper surface of the motor stand are provided. A shaft alignment adjusting device for a large motor, comprising: a liner plate that is inserted into the gap to be formed and holds the gap at a size where the alignment is adjusted.