CA1201103A - Support device for checking and repairing a heavy rotatable object - Google Patents
Support device for checking and repairing a heavy rotatable objectInfo
- Publication number
- CA1201103A CA1201103A CA000441472A CA441472A CA1201103A CA 1201103 A CA1201103 A CA 1201103A CA 000441472 A CA000441472 A CA 000441472A CA 441472 A CA441472 A CA 441472A CA 1201103 A CA1201103 A CA 1201103A
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- Canada
- Prior art keywords
- support
- base
- roller support
- roller
- shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
SPECIFICATION
1. TITLE OF THE INVENTION
A support device for checking and repairing a heavy rotatable object 2. ABSTRACT OF DISCLOSURE
A support device for checking and repairing a heavy rotatable object such as a large turbine rotor is disclosed. The support device comprises a pair of self-aligning support structures for rotatably supporting both ends of the shaft of the heavy rotatable object. In each self-aligning support structure, a roller support base rotatably supporting the corresponding end of the shaft of the object with a pair of support rollers is mounted on a base frame by means of a hemispherical support mechanism, and moreover a jig for adjusting the horizontal rotating position of the roller support base around the vertical axis of the hemispherical support mechanism is disposed in the periphery of the base frame. Due to such construction, the occurrence of the thrust force on the heavy rotatable object as well as the support rollers is completely eliminated.
1. TITLE OF THE INVENTION
A support device for checking and repairing a heavy rotatable object 2. ABSTRACT OF DISCLOSURE
A support device for checking and repairing a heavy rotatable object such as a large turbine rotor is disclosed. The support device comprises a pair of self-aligning support structures for rotatably supporting both ends of the shaft of the heavy rotatable object. In each self-aligning support structure, a roller support base rotatably supporting the corresponding end of the shaft of the object with a pair of support rollers is mounted on a base frame by means of a hemispherical support mechanism, and moreover a jig for adjusting the horizontal rotating position of the roller support base around the vertical axis of the hemispherical support mechanism is disposed in the periphery of the base frame. Due to such construction, the occurrence of the thrust force on the heavy rotatable object as well as the support rollers is completely eliminated.
Description
3. BACKGROUND OF INVENTION
The present invention relates to a support device which supports the both ends of the shaft of a heavy rotatable object, particularly of a large-sized ancl heavy-weight turbine rotor for a power generator for checking and repa;rillg them ancl easily achieves adjus~men~ of horizontal levelling.
Conven tionally, the roller support base, for example, of the turbine rotor for power generator which rotatably supports one end of the shaft has been mounted on the base frame with plurality of adjusting bolts. Moreover, such base frame has been generally installed on the floor surface not specially strengthened. Therefore, even if an accurate horizontal levelling of the roller support base is obtained previously by means of the adjusting bolts, when the turbine rotor is once placed on the roller support base, the Eloor surface is distorted or warped by the weight of said roller support base resulting in poor levelling. Such poor levelling or distortion of floor surface produces a considerable degree of thrust on the supporting rollers of roller support base. This thrust is enhanced by deflection of rotor shaft. Thereby, the turbine is encountered with irregular rotation including movement in the axial direction. Accordingly, not only check and repair of turbine become extremely difficult and cumbersome, but also, in extrem~e cases, such irregular rotation results in partial abrasion of supporting rollers or rupture of them in some cases. This makes check and repair very dangerous.
Consequently, further level adjustment is essential for preventing such situation, but it has always required much difficulty followed by a great expenditure of time and labor.
The inventors of the present invention have proposed, in the Japanese Patent Application No. 168450/1981, a support device for checking and '~, ~ .. ...
?3 repairing a heavy rotatable object such as a turbine rotor providing an automatic level adjusting mechanism which simplifies the level adjustment by eliminating defects of existing support devices. Narnely, such device can automatically align the axis of the heavy rotatable object with the axis of support rollers. ~lowever, such a support device for checking and repairing the heavy rotatable shaft which has the construction shown in Fig. 1, has not ye-t been considered perfect in such a point that it results in the movement of a turbine rotor (b) in the axial direction, although a little, after it is placed on the roller support base (a) and the turbine rotor is started to rotate. Such movement in the axial direction is supposed to occur due to the following causes.
Since the roller support base (a) is suppor ted by the hemi spherical support (c), the axis of the turbine rotor (b) and the roller (d) supporting the end of the turbine rotor (b) must ideally be formed in parallel when the turbine rotor (b) is placed on the roller support base (a). Moreover, even when the turbine rotor (b) rotates by way of the roller (d), any thrust load must not be generated not incurring any movement of rotor in the axial direction so long as the parallelism between the axes of the rotor (b) and the roller (d) are surely kept. However, practically, both axes of the rotor (b) and the roller (d) are not formed in parallel because of some reasons, for example, indicated below.
(a) Machining error (b) Assembling error (c) Unbalance of roller support base (a) before placing the turbine rotor (b) (d) Unbalance of roller support base (a) after placing of the turbine rotor (b) or resultant deformation (e) Effect of driving force (E) Effect of friction 1he causes (a) to (d) are considered to bring about following phenomena.
(1) Destroying parallelism (alignment) between the axes of the turbine rotor (b) ancl roller (d).
The present invention relates to a support device which supports the both ends of the shaft of a heavy rotatable object, particularly of a large-sized ancl heavy-weight turbine rotor for a power generator for checking and repa;rillg them ancl easily achieves adjus~men~ of horizontal levelling.
Conven tionally, the roller support base, for example, of the turbine rotor for power generator which rotatably supports one end of the shaft has been mounted on the base frame with plurality of adjusting bolts. Moreover, such base frame has been generally installed on the floor surface not specially strengthened. Therefore, even if an accurate horizontal levelling of the roller support base is obtained previously by means of the adjusting bolts, when the turbine rotor is once placed on the roller support base, the Eloor surface is distorted or warped by the weight of said roller support base resulting in poor levelling. Such poor levelling or distortion of floor surface produces a considerable degree of thrust on the supporting rollers of roller support base. This thrust is enhanced by deflection of rotor shaft. Thereby, the turbine is encountered with irregular rotation including movement in the axial direction. Accordingly, not only check and repair of turbine become extremely difficult and cumbersome, but also, in extrem~e cases, such irregular rotation results in partial abrasion of supporting rollers or rupture of them in some cases. This makes check and repair very dangerous.
Consequently, further level adjustment is essential for preventing such situation, but it has always required much difficulty followed by a great expenditure of time and labor.
The inventors of the present invention have proposed, in the Japanese Patent Application No. 168450/1981, a support device for checking and '~, ~ .. ...
?3 repairing a heavy rotatable object such as a turbine rotor providing an automatic level adjusting mechanism which simplifies the level adjustment by eliminating defects of existing support devices. Narnely, such device can automatically align the axis of the heavy rotatable object with the axis of support rollers. ~lowever, such a support device for checking and repairing the heavy rotatable shaft which has the construction shown in Fig. 1, has not ye-t been considered perfect in such a point that it results in the movement of a turbine rotor (b) in the axial direction, although a little, after it is placed on the roller support base (a) and the turbine rotor is started to rotate. Such movement in the axial direction is supposed to occur due to the following causes.
Since the roller support base (a) is suppor ted by the hemi spherical support (c), the axis of the turbine rotor (b) and the roller (d) supporting the end of the turbine rotor (b) must ideally be formed in parallel when the turbine rotor (b) is placed on the roller support base (a). Moreover, even when the turbine rotor (b) rotates by way of the roller (d), any thrust load must not be generated not incurring any movement of rotor in the axial direction so long as the parallelism between the axes of the rotor (b) and the roller (d) are surely kept. However, practically, both axes of the rotor (b) and the roller (d) are not formed in parallel because of some reasons, for example, indicated below.
(a) Machining error (b) Assembling error (c) Unbalance of roller support base (a) before placing the turbine rotor (b) (d) Unbalance of roller support base (a) after placing of the turbine rotor (b) or resultant deformation (e) Effect of driving force (E) Effect of friction 1he causes (a) to (d) are considered to bring about following phenomena.
(1) Destroying parallelism (alignment) between the axes of the turbine rotor (b) ancl roller (d).
(2) Destroying a uniform applying of a contact pressure between the rotor (b) and roller (d) and changing oE the inclination of the turbine rotor (b) and roller shaft (d) generated when a drive force is applied.
~ lere, it is supposed the condition (before start of operation) where the rotor (b) is only placed on the roller support base (a) (Refer to Fig. l~)o ~lthough the horizontal levelling is a little poor as explained previously because of above-listed causes, the system as a whole is balanced as shown in Fig. 2. However, this condition does not guarantee that a pressure between the turbine rotor (b) and roller (d) is uniformly distributed in the axial direction. Rather, the pressure is considered to be inwardly (blade side) or outwardly concentrated. To be more in detail, if the inner pressure of one roller (d) of the roller support base (a) in the driving side is, for example, high~ a resultant pressure at the inside of the other roller (d) also becomes high. Accordingly, the moments at the center of the hemi spherical support mechanism (c) must be mutually cancelled.
When a driving force is applied under this condition, a larger tangent force is transmitted in the high pressure side and thereby a reacting force resulting from the turbine rotor (b) generates unbalanced moments at the center of hemi spherical support mechanism. As a resultj the roller support base (a) generates rotating deflection in the direction of such moment as ~2a~L~03 shown in Fig. 3. If a gradient is thus generated between the axis of the turbine rotor (b) and the axis of the roller (d), the pressure and the tangent force are redistributed, balancing the moments at the center of the hemi spherical support mechanism (c). Further, when the turbine rotor is rotating in the conclition as shown in Fig. 3, the turbine rotor (b) moves in the axial direction. If it is rotated reversely, a tangent force is generated reversely, resulting in a rotating deflection directed to the roller support base (a).
Therefore, the turbine rotor (b3 also moves in the same direction as explained above.
If the movement is considered to occur in the axial direction because of the reason described above, the roller support base (a) rnust rotate only a little in such a moment when the turbine rotor (b) is driven.
From the above observation and analysis, following measures are considered effective for making such movement in the axial direction as small as possible.
(1) The roller support base (a) is fixed under the condition that the rotor (b) is placed on the support base (a) so that the base (a) is no longer rotated even with a driving force on a horizontai plane.
(2) In this case, if the roller suppGrt base (a) is fixed by screwing, the movement can further be kept small through the adjustment by slightly rotating the roller support base (a) in accordance with direction and amount of movement the base (a) checked trially by rotating the turbine rotor (d).
The present invention has been derived from such findings and experiences and intended to provide a support device for checking and repairing a heavy rotatable object which further simplifies the levelling or ;P3 the alignment and ensures, a rnore accurate and safer check and repair by eliminating the movement in the axial direction of turbine rotor which has been generated by driving the turbine rotor in the existing system.
In summary, the present invention relates to a support device for checking and repairing a heavy rotatable objec~, wherein such device comprises a pair of self-aligning support structures for rotatably supporting both ends of the heavy rotatable object. In each support structrue, a roller support base supporting rotatably the end of the shaft of the heavy rotatable object is supported on an adjustable surface plate of the base frame by means of a hemi spherical support mechanism, and moreover a jig for adjusting the horizontal rotating position of the roller support base around the vertical axis o~ a hemi spherical support mechanism is mounted in the periphery of an adjustable surface plate.
4. BRI~F DESC~IPTION OF THE DRAWINGS
Fig 1 shows an enlarged side elevational view including a partial cut-away portion of the conventional support device ~or checking and repairing the heavy rotatable shaft. Fig. 2 and Fig. 3 are explanatory views showing the horizontal levelling operation by the same support device. Fig.--h is a plan view of the support device for checking and repairing the heavy rotatable object to which the present invention is applied. Fig. 5 is a front view of the same support device. Fig. 6 is a cross-sectional view along the line 1-1 in Fig. 4. Fig. 7 is a side elevational view including a partial cut-away portion of the drive-side support structure. Fig. ~ is an enlarged front view of the mounting portion of the roting position adjusting jig. Fig. 9 is a plan view of the same support structure. Fig. 10 and Fig. 11 are a plan view and a front .
~V31~ 3 view of the same support structure indicating the mounting position of the rotating position adjusting jig. Fig. 12 and Fig. 13 are explanatory views showin~ the vertical levelling or al;gnment of the support structure before and aEter the cl;sposition oE the heavy rotatable object. Fig. 14 and Fig. 15 show axis alignrnen t in the horizontal direction of the support structure before and after the impellers are mounted.
5. DETAILED DESCRIPTION OF DISCLOSURE
A preferred embodiment of the support device of the present invention is hereinafter disclosed in detail in conjunction with the attached drawings.
(Refer to Fig. 4 to Fig. 11.) In the drawings, numeral (1) is a drive-side roller support base, while numeral (1') is a follower-side roller support base. These roller support bases (1) and (1') are supported respectively at their centers on the adjustable surface plates (l~) and (~') of the base frames (3),(3') by means of the hemi spherical support mechanisms (2~ and (2').
The drive-side roller support base (1) is provided with a pair of drive rollers (5)9 (5). The rotating shafts (6~, (6) of these rollers (5), (5) are respectively supported at the right and left sides by the bearings ~) and (7).
Moreover, the worms (11), (11) provided on the power transmission shaft (10) of the geared motor (9) are engaged with the worm wheels (8), (8) provided at the both ends of said rotatlng shaft. Thereby, the drive rollers (5), (5) rotate synchronously, causing the one end (12) of the shaft of the turbine rotor supported by such rollers (5), (5) to rotate at a speed as low as 0.3 rpm.
Meanwhile, the follower-side roller support base (1') has such a simple structure that the shafts (6'), (6') of a pair of follower-side rollers (5'); (5') are supported by the bearings (7'), (7') as in the case above and the other end (12) of the shaft of the turbine rotor is rotatably supported by these roller (5'), (5'). The above drive-side rollers and follower-side rollers are generally made of specially reinforced plastic materials. Furthermore, a means for weight balance is addecl adequately to the drive-side roller support base (1).
Said hemi spherical support mechanisms (2), (2') are disposed at the center of respective roller support bases (1), (1'). Each mechanism comprises a vertical support shaft (21), (21') which has the top or upper end thereof formed approximately in a hemi spherical shape and hemi spherical-recessed pad (22), (22') which is uniformly engaged with the hemi sherical top of vertical support shaft (21), (21'). Although in the drawings, the support shafts (21), (~1') are provided at the center of adjustable surface plate (4), (4') on the base frames (3), (3') and ~he hemi spherical-recessed pads (22), (22'), also at the center of roller support bases (1), (1'), they may also be mounted upside down respectively. In addition, a suitable lubricant is applied to the contact surfaces of hemi spherical support mechanisms (2), (2'). It is also preferable to provide compression springs (13~, (13') between the roller support bases (1), (1'~ and adjustable surface plates (4), (4') so as to make the roller support bases (1), (1') resiliently return and take a position parallel to the surface plates (4), (4').
~ suitable gap or clearance must be provided between the adjustable surface plates (4), (4') and the upper roller support bases (1), (1') so as to allow the roller support bases (1), (1') to sufficiently tilt in all radial directions on the hemi spherical support mechanisms (2), (2'). Moreover, the surface plates (4), (4') are mounted on the base frames (3), (3') with plurality of adjusting bolts (14), (14') so that they can be vertically adjusted freely ~o the desired height. Numerals (15), (15') are guide pins. This adjusting means is a well known method.
The present invention is substantially characterized by incorporating a following structure to the above basic structure. Namely, a jig (29) for adjustillg th~ horizontal rotating positions of the roller support bases (1), (1') around the herni spherical support mechanisms (2), (2') is attached to the periphery of the adjustable surface plates t4), (4'). Such rotating position adjusting jig (29) can be installed, as shown in Fig. 4 and Fig. S. L-shaped brackets (30), (30') are mounted in the Eront and rear sides of the adjustable surface plates (4), (4') symmetrically to the axis of the shaft of the turbine rotor (A) with a specified interval, the adjusting bolts (31), (31') are screwed to the upper ends of the same L-shaped bracl<ets (30), (30'), and the end points of the bolts (31), (31') come lnto contact with the corresponding side edges of roller support bases (1), (1'). It is also enough to mount such rotating position adjusting jig only to the drive side.
~ ig. 8 and Fig. 9 show another embodiment of the rotating position adjusting jig (29). Numeral (29a) is a fixed plate attached by a coupling bolt (29b) to the periphery of the adjustable surface plate (4). This fixed plate (29a) is provided with a hollow groove (29c) at its upper~portlon allowing insercion of a distal portion of a projection (29d) which has the proximal end thereof connected to the periphery of the roller support base (1), with gaps (c). In addition, numerals (29e), (29f) indicate adjusting bolts screwed to vertical portions (29g) located in both sides of such hollow groove (29c) and these bolts (29e), (29f) move forward or backward to/from the projection (29d) and also abut therewith. By adjusting amount of movement of the adjusting bolt (29e) with such structure, the relative horizonta1 rotating ~%0~ 3 position of the rotor support base (1) to the adjustable surface plate (4) can easily be adjusted, and such adjusted position can be maintained reliably.
~ ig. 10 and Fig. 11 show the mounting conditions of aforementioned rotating position adjusting jig (29). In this mounting example, it is enough to mount such jig (29) only at a position in the periphery of the adjustable surface plates (4), (l~l). However, it is also possible to mount a plurality of such jigs (29) including the other positions.
With such structure, the manner in which the support structure of the present invention effect the horizontal levelling at the top of the hemi spherical support mechanisms (2), (2') is hereinafter disclosed.
~ efore bridging the turbine rotor (A), the height of adjustable surface plates (4), (4') on the base frames (3), (3'~ ade~uately placed on the floor surface is adjusted with the adjusting bolts (l4), (14') as in the case of existing support structure in order to obtain the horizontal levelling. When such vertical adjustment is once completed, suitable wedges (not shown in the figures) are driven into the clearances between thc adjustable surface plates (4), (4') and the base ~rames (3), (3') in order to firmly and rigidly secure the adjustable surface plates to the base frames. Thereafter, both ends (12) of the shaft of the turbine rotor (A) are laid on the drive rollers (5), (5) and follower rollers (5'), (5') of the roller support bases (1), (1') respectively.
If the floor surface may distort or warp due to the weight of turbine rotor causing a poor levelling, such an error ~H in the horizontal levelling is covered by the roller support bases (1), (1) which automatically follows a tilt by means of the hemi spherical support mechanisms (2), (2') so long as such error is not abnormally large, and the rollers (5), (5), (5'), (5') always support perpendicularly to the axis C-C of the shaft of the turbine rotor ~A) even when the rotor shaft (12) may be distorted. (Refer to Fig. 12 and Fig. 13.) Namely, the axis of the turbine rotor (A) and rollers (5), (5), (5'), (5') are automatically ali~ned due to the weight of the turbine rotor (A). The same situation is in effect for the lateral direction. Namely, as shown in Fig. I4, even iE the axes Cl-Cl and C2-C2 of the rollers (5), (5') and (6), (6') are not aligned slightly or mismatched to the axis C-C of the turbine rotor shaft connecting the crests of the hemi spherical support mechanisms (2), (2'), it can automatically be aligned to the axis C-C by the automatic axis adjusting function of the hemi spherical support mechanisms (2), (2'). (Refer to Fig.
15.) Therefore, even when the drive rollers (5), (5) are driven so as to rotate the turbine rotor (A), it ro~ates on the same axis thereof and does not generate any movement thereof in the axial direction, not followed by frictional wearness of rollers (5), (5), (5'), (5') because both ends (12) of the shaft of the turbine rotor is uniformly supported by the rollers (S), (5), (5'), (5') by the surface contactness.
Furthermore, if the turbine rotor (A) moves even a little in the axial direction while it is rotating, the rotor support bases (1), (1') can be rotated horizontally around the shaft of the hemi spherical support mechanisms ~2), (2') for the specified angle by moving forward or backward the adjusting bolts (31), (31') in accordance with the direction and calculated amount of movernent of the turbine rotor (A) and thereby the movement of the turbine rotor (A) in the axial direction due to rotor drive can also be kept as small as possible.
As described above, the support structure according to the present invention can substantially and perfectly prevent movement of turbine rotor `\
~V~ 3 in the axial direction even during the rotation of the turbine rotor, does not require the readjustment which has been essentially required by the existing structure, can drastically reduce t~e time and labor necessary for the horizontal levelling operation, and also can outstalldingly reduce frictional wearness of support rollers.
~ lere, it is supposed the condition (before start of operation) where the rotor (b) is only placed on the roller support base (a) (Refer to Fig. l~)o ~lthough the horizontal levelling is a little poor as explained previously because of above-listed causes, the system as a whole is balanced as shown in Fig. 2. However, this condition does not guarantee that a pressure between the turbine rotor (b) and roller (d) is uniformly distributed in the axial direction. Rather, the pressure is considered to be inwardly (blade side) or outwardly concentrated. To be more in detail, if the inner pressure of one roller (d) of the roller support base (a) in the driving side is, for example, high~ a resultant pressure at the inside of the other roller (d) also becomes high. Accordingly, the moments at the center of the hemi spherical support mechanism (c) must be mutually cancelled.
When a driving force is applied under this condition, a larger tangent force is transmitted in the high pressure side and thereby a reacting force resulting from the turbine rotor (b) generates unbalanced moments at the center of hemi spherical support mechanism. As a resultj the roller support base (a) generates rotating deflection in the direction of such moment as ~2a~L~03 shown in Fig. 3. If a gradient is thus generated between the axis of the turbine rotor (b) and the axis of the roller (d), the pressure and the tangent force are redistributed, balancing the moments at the center of the hemi spherical support mechanism (c). Further, when the turbine rotor is rotating in the conclition as shown in Fig. 3, the turbine rotor (b) moves in the axial direction. If it is rotated reversely, a tangent force is generated reversely, resulting in a rotating deflection directed to the roller support base (a).
Therefore, the turbine rotor (b3 also moves in the same direction as explained above.
If the movement is considered to occur in the axial direction because of the reason described above, the roller support base (a) rnust rotate only a little in such a moment when the turbine rotor (b) is driven.
From the above observation and analysis, following measures are considered effective for making such movement in the axial direction as small as possible.
(1) The roller support base (a) is fixed under the condition that the rotor (b) is placed on the support base (a) so that the base (a) is no longer rotated even with a driving force on a horizontai plane.
(2) In this case, if the roller suppGrt base (a) is fixed by screwing, the movement can further be kept small through the adjustment by slightly rotating the roller support base (a) in accordance with direction and amount of movement the base (a) checked trially by rotating the turbine rotor (d).
The present invention has been derived from such findings and experiences and intended to provide a support device for checking and repairing a heavy rotatable object which further simplifies the levelling or ;P3 the alignment and ensures, a rnore accurate and safer check and repair by eliminating the movement in the axial direction of turbine rotor which has been generated by driving the turbine rotor in the existing system.
In summary, the present invention relates to a support device for checking and repairing a heavy rotatable objec~, wherein such device comprises a pair of self-aligning support structures for rotatably supporting both ends of the heavy rotatable object. In each support structrue, a roller support base supporting rotatably the end of the shaft of the heavy rotatable object is supported on an adjustable surface plate of the base frame by means of a hemi spherical support mechanism, and moreover a jig for adjusting the horizontal rotating position of the roller support base around the vertical axis o~ a hemi spherical support mechanism is mounted in the periphery of an adjustable surface plate.
4. BRI~F DESC~IPTION OF THE DRAWINGS
Fig 1 shows an enlarged side elevational view including a partial cut-away portion of the conventional support device ~or checking and repairing the heavy rotatable shaft. Fig. 2 and Fig. 3 are explanatory views showing the horizontal levelling operation by the same support device. Fig.--h is a plan view of the support device for checking and repairing the heavy rotatable object to which the present invention is applied. Fig. 5 is a front view of the same support device. Fig. 6 is a cross-sectional view along the line 1-1 in Fig. 4. Fig. 7 is a side elevational view including a partial cut-away portion of the drive-side support structure. Fig. ~ is an enlarged front view of the mounting portion of the roting position adjusting jig. Fig. 9 is a plan view of the same support structure. Fig. 10 and Fig. 11 are a plan view and a front .
~V31~ 3 view of the same support structure indicating the mounting position of the rotating position adjusting jig. Fig. 12 and Fig. 13 are explanatory views showin~ the vertical levelling or al;gnment of the support structure before and aEter the cl;sposition oE the heavy rotatable object. Fig. 14 and Fig. 15 show axis alignrnen t in the horizontal direction of the support structure before and after the impellers are mounted.
5. DETAILED DESCRIPTION OF DISCLOSURE
A preferred embodiment of the support device of the present invention is hereinafter disclosed in detail in conjunction with the attached drawings.
(Refer to Fig. 4 to Fig. 11.) In the drawings, numeral (1) is a drive-side roller support base, while numeral (1') is a follower-side roller support base. These roller support bases (1) and (1') are supported respectively at their centers on the adjustable surface plates (l~) and (~') of the base frames (3),(3') by means of the hemi spherical support mechanisms (2~ and (2').
The drive-side roller support base (1) is provided with a pair of drive rollers (5)9 (5). The rotating shafts (6~, (6) of these rollers (5), (5) are respectively supported at the right and left sides by the bearings ~) and (7).
Moreover, the worms (11), (11) provided on the power transmission shaft (10) of the geared motor (9) are engaged with the worm wheels (8), (8) provided at the both ends of said rotatlng shaft. Thereby, the drive rollers (5), (5) rotate synchronously, causing the one end (12) of the shaft of the turbine rotor supported by such rollers (5), (5) to rotate at a speed as low as 0.3 rpm.
Meanwhile, the follower-side roller support base (1') has such a simple structure that the shafts (6'), (6') of a pair of follower-side rollers (5'); (5') are supported by the bearings (7'), (7') as in the case above and the other end (12) of the shaft of the turbine rotor is rotatably supported by these roller (5'), (5'). The above drive-side rollers and follower-side rollers are generally made of specially reinforced plastic materials. Furthermore, a means for weight balance is addecl adequately to the drive-side roller support base (1).
Said hemi spherical support mechanisms (2), (2') are disposed at the center of respective roller support bases (1), (1'). Each mechanism comprises a vertical support shaft (21), (21') which has the top or upper end thereof formed approximately in a hemi spherical shape and hemi spherical-recessed pad (22), (22') which is uniformly engaged with the hemi sherical top of vertical support shaft (21), (21'). Although in the drawings, the support shafts (21), (~1') are provided at the center of adjustable surface plate (4), (4') on the base frames (3), (3') and ~he hemi spherical-recessed pads (22), (22'), also at the center of roller support bases (1), (1'), they may also be mounted upside down respectively. In addition, a suitable lubricant is applied to the contact surfaces of hemi spherical support mechanisms (2), (2'). It is also preferable to provide compression springs (13~, (13') between the roller support bases (1), (1'~ and adjustable surface plates (4), (4') so as to make the roller support bases (1), (1') resiliently return and take a position parallel to the surface plates (4), (4').
~ suitable gap or clearance must be provided between the adjustable surface plates (4), (4') and the upper roller support bases (1), (1') so as to allow the roller support bases (1), (1') to sufficiently tilt in all radial directions on the hemi spherical support mechanisms (2), (2'). Moreover, the surface plates (4), (4') are mounted on the base frames (3), (3') with plurality of adjusting bolts (14), (14') so that they can be vertically adjusted freely ~o the desired height. Numerals (15), (15') are guide pins. This adjusting means is a well known method.
The present invention is substantially characterized by incorporating a following structure to the above basic structure. Namely, a jig (29) for adjustillg th~ horizontal rotating positions of the roller support bases (1), (1') around the herni spherical support mechanisms (2), (2') is attached to the periphery of the adjustable surface plates t4), (4'). Such rotating position adjusting jig (29) can be installed, as shown in Fig. 4 and Fig. S. L-shaped brackets (30), (30') are mounted in the Eront and rear sides of the adjustable surface plates (4), (4') symmetrically to the axis of the shaft of the turbine rotor (A) with a specified interval, the adjusting bolts (31), (31') are screwed to the upper ends of the same L-shaped bracl<ets (30), (30'), and the end points of the bolts (31), (31') come lnto contact with the corresponding side edges of roller support bases (1), (1'). It is also enough to mount such rotating position adjusting jig only to the drive side.
~ ig. 8 and Fig. 9 show another embodiment of the rotating position adjusting jig (29). Numeral (29a) is a fixed plate attached by a coupling bolt (29b) to the periphery of the adjustable surface plate (4). This fixed plate (29a) is provided with a hollow groove (29c) at its upper~portlon allowing insercion of a distal portion of a projection (29d) which has the proximal end thereof connected to the periphery of the roller support base (1), with gaps (c). In addition, numerals (29e), (29f) indicate adjusting bolts screwed to vertical portions (29g) located in both sides of such hollow groove (29c) and these bolts (29e), (29f) move forward or backward to/from the projection (29d) and also abut therewith. By adjusting amount of movement of the adjusting bolt (29e) with such structure, the relative horizonta1 rotating ~%0~ 3 position of the rotor support base (1) to the adjustable surface plate (4) can easily be adjusted, and such adjusted position can be maintained reliably.
~ ig. 10 and Fig. 11 show the mounting conditions of aforementioned rotating position adjusting jig (29). In this mounting example, it is enough to mount such jig (29) only at a position in the periphery of the adjustable surface plates (4), (l~l). However, it is also possible to mount a plurality of such jigs (29) including the other positions.
With such structure, the manner in which the support structure of the present invention effect the horizontal levelling at the top of the hemi spherical support mechanisms (2), (2') is hereinafter disclosed.
~ efore bridging the turbine rotor (A), the height of adjustable surface plates (4), (4') on the base frames (3), (3'~ ade~uately placed on the floor surface is adjusted with the adjusting bolts (l4), (14') as in the case of existing support structure in order to obtain the horizontal levelling. When such vertical adjustment is once completed, suitable wedges (not shown in the figures) are driven into the clearances between thc adjustable surface plates (4), (4') and the base ~rames (3), (3') in order to firmly and rigidly secure the adjustable surface plates to the base frames. Thereafter, both ends (12) of the shaft of the turbine rotor (A) are laid on the drive rollers (5), (5) and follower rollers (5'), (5') of the roller support bases (1), (1') respectively.
If the floor surface may distort or warp due to the weight of turbine rotor causing a poor levelling, such an error ~H in the horizontal levelling is covered by the roller support bases (1), (1) which automatically follows a tilt by means of the hemi spherical support mechanisms (2), (2') so long as such error is not abnormally large, and the rollers (5), (5), (5'), (5') always support perpendicularly to the axis C-C of the shaft of the turbine rotor ~A) even when the rotor shaft (12) may be distorted. (Refer to Fig. 12 and Fig. 13.) Namely, the axis of the turbine rotor (A) and rollers (5), (5), (5'), (5') are automatically ali~ned due to the weight of the turbine rotor (A). The same situation is in effect for the lateral direction. Namely, as shown in Fig. I4, even iE the axes Cl-Cl and C2-C2 of the rollers (5), (5') and (6), (6') are not aligned slightly or mismatched to the axis C-C of the turbine rotor shaft connecting the crests of the hemi spherical support mechanisms (2), (2'), it can automatically be aligned to the axis C-C by the automatic axis adjusting function of the hemi spherical support mechanisms (2), (2'). (Refer to Fig.
15.) Therefore, even when the drive rollers (5), (5) are driven so as to rotate the turbine rotor (A), it ro~ates on the same axis thereof and does not generate any movement thereof in the axial direction, not followed by frictional wearness of rollers (5), (5), (5'), (5') because both ends (12) of the shaft of the turbine rotor is uniformly supported by the rollers (S), (5), (5'), (5') by the surface contactness.
Furthermore, if the turbine rotor (A) moves even a little in the axial direction while it is rotating, the rotor support bases (1), (1') can be rotated horizontally around the shaft of the hemi spherical support mechanisms ~2), (2') for the specified angle by moving forward or backward the adjusting bolts (31), (31') in accordance with the direction and calculated amount of movernent of the turbine rotor (A) and thereby the movement of the turbine rotor (A) in the axial direction due to rotor drive can also be kept as small as possible.
As described above, the support structure according to the present invention can substantially and perfectly prevent movement of turbine rotor `\
~V~ 3 in the axial direction even during the rotation of the turbine rotor, does not require the readjustment which has been essentially required by the existing structure, can drastically reduce t~e time and labor necessary for the horizontal levelling operation, and also can outstalldingly reduce frictional wearness of support rollers.
Claims
1. A support device for checking and repairing a heavy rotatable object such as a large turbine rotor comprising a pair of self-aligning support structures for rotatably suporting both end of a shaft of said heavy object, said support structures disposed at a distance providing a space for accommodating said heavy weight object, said each self-aligning support structure comprising;
i) a base frame set on a floor, ii) a roller support base mounted on said base frame, iii) a hemispherical support mechanism interposed between said base frame and said roller support base so as to allow said roller support base to tilt in any radial direction on said base frame, iv) a pair of parallely-spaced-apart support rollers mounted on said roller support base and rotatably supporting one end of said shaft of said heavy weight object, v) a drive mechanism with a high ratio reduction means operably coupled with said support rollers on one of said roller support bases allowing said shaft of said object to rotate at a very low speed, and vi) a jig for adjusting the horizontal rotating position of said roller support base around the vertical axis of said hemispherical support mechanism, said jig disposed in the periphery of said base frame.
i) a base frame set on a floor, ii) a roller support base mounted on said base frame, iii) a hemispherical support mechanism interposed between said base frame and said roller support base so as to allow said roller support base to tilt in any radial direction on said base frame, iv) a pair of parallely-spaced-apart support rollers mounted on said roller support base and rotatably supporting one end of said shaft of said heavy weight object, v) a drive mechanism with a high ratio reduction means operably coupled with said support rollers on one of said roller support bases allowing said shaft of said object to rotate at a very low speed, and vi) a jig for adjusting the horizontal rotating position of said roller support base around the vertical axis of said hemispherical support mechanism, said jig disposed in the periphery of said base frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000441472A CA1201103A (en) | 1983-11-18 | 1983-11-18 | Support device for checking and repairing a heavy rotatable object |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000441472A CA1201103A (en) | 1983-11-18 | 1983-11-18 | Support device for checking and repairing a heavy rotatable object |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1201103A true CA1201103A (en) | 1986-02-25 |
Family
ID=4126557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000441472A Expired CA1201103A (en) | 1983-11-18 | 1983-11-18 | Support device for checking and repairing a heavy rotatable object |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1201103A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104527926A (en) * | 2015-01-07 | 2015-04-22 | 广州文冲船厂有限责任公司 | Bearing mounting device and method for single-bearing ship |
| CN112664769A (en) * | 2020-12-15 | 2021-04-16 | 北京航星机器制造有限公司 | Automatic leveling device for level measurement |
-
1983
- 1983-11-18 CA CA000441472A patent/CA1201103A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104527926A (en) * | 2015-01-07 | 2015-04-22 | 广州文冲船厂有限责任公司 | Bearing mounting device and method for single-bearing ship |
| CN112664769A (en) * | 2020-12-15 | 2021-04-16 | 北京航星机器制造有限公司 | Automatic leveling device for level measurement |
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