Jack centering device

Abstract

The application discloses a jacking aligning device, which comprises a first bearing seat, a first mounting cavity coaxially arranged on the upper portion of the first bearing seat, a cushion block coaxially arranged on the cavity bottom of the first mounting cavity, a second mounting cavity coaxially arranged on the upper portion of the cushion block, three steel balls placed in the second mounting cavity, a second bearing seat connected with the upper end of the first bearing seat, a limiting cavity arranged in the first mounting cavity and extending to the lower end of the second bearing seat, a bearing cover coaxially and rotatably connected with the upper end of the second bearing seat through a thrust roller bearing, and a positioning connecting piece coaxially connected with the upper end of the bearing cover; at least three aligning stop bolts for adjusting the horizontal position of the second bearing seat are uniformly arranged on the first bearing seat in the circumferential direction, and the screw rod end of the aligning stop bolt is screwed with the first bearing seat and then radially inserted into the second bearing seat. In the application, the three steel balls simultaneously bear the large load under the working condition of jacking, so that the stability of the device in supporting and aligning translation is improved, and the aligning efficiency is also improved.

Description

Technical Field

[0001] This invention belongs to the field of main pump motor assembly technology, and particularly relates to a lifting and self-aligning device. Background Technology

[0002] During the main pump motor assembly process, the following operations are generally required: During the insertion of the rotor into the stator and the assembly of the thrust bearing, the rotor needs to be aligned to ensure that the air gap between the stator and rotor, and the clearance between the rotor and the upper bearing oil chamber baffle, meet the requirements of the drawings and the thrust head heat fitting, thus preventing assembly rubbing or interference. After the thrust bearing is assembled, the rotor needs to be lifted, and the actual machining amount of the adjusting shims between the upper and lower thrust bearings needs to be calculated based on the lifting data to ensure that the thrust bearing assembly clearance meets the design requirements. After heat fitting the flywheel, the main pump motor needs to be simulated under load during startup and operation at the power plant site to apply a load, simulating the resistance torque generated by the axial thrust of the coolant pump on the main pump motor at the power plant site.

[0003] Currently, hydraulic jacks use a single steel ball structure as a lifting and self-aligning device to lift the rotor. However, due to the large load during lifting and the concentrated force application point of the single steel ball structure, the steel balls and steel ball pads are prone to deformation or cracking during use. This results in a short service life, frequent replacement, and increased operating costs for the single steel ball structure. Furthermore, the single steel ball structure cannot accurately adjust the rotor's center relative to the stator while it is lifted, requiring the use of a crane for self-alignment, which is inconvenient and inefficient. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a lifting and self-aligning device that can significantly improve reliability and self-aligning efficiency.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A self-aligning device includes a first bearing housing, a first mounting cavity coaxially disposed on the upper part of the first bearing housing, a pad coaxially disposed on the bottom of the first mounting cavity, a second mounting cavity coaxially disposed on the upper part of the pad, three steel balls with their inner sides in contact placed in the second mounting cavity, a second bearing housing connected to the upper end of the first bearing housing, a limiting cavity for restricting the outer sides of the three steel balls provided on the lower end of the second bearing housing extending into the first mounting cavity, and a bearing cover coaxially rotatably connected to the upper end of the second bearing housing via a thrust roller bearing, and a positioning connector for coaxially fixing a rotor coaxially fixedly connected to the upper end of the bearing cover; at least three self-aligning anti-rotation bolts for adjusting the horizontal position of the second bearing housing are evenly disposed on the circumferential direction of the first bearing housing, and the screw end of the self-aligning anti-rotation bolt is threadedly connected to the first bearing housing and then radially inserted into the second bearing housing.

[0007] The beneficial effects of adopting the above technical solution are as follows: the three steel balls bear a large load during jacking, so as to avoid the force application point being too concentrated, thereby reducing the deformation of the steel balls or pads and thus improving reliability; the jacking self-aligning device can adjust the horizontal position of the second bearing seat through these self-aligning anti-rotation bolts, whether in the installation state or in the jacking state, thereby adjusting the horizontal position of the jacking rotor, and the thrust roller bearing can be dynamically centered, which is beneficial to adjusting the center of the rotor relative to the stator, thus significantly improving the self-aligning efficiency.

[0008] Furthermore, a thrust roller bearing is coaxially connected to the upper part of the second bearing housing, and the lower part of the bearing cover is coaxially inserted into the thrust roller bearing.

[0009] The beneficial effects of adopting the above technical solution are: the thrust roller bearing can achieve dynamic centering so that the axis center of the rotor is concentric with the rotation center of the thrust roller bearing, and the interference on the rotor rotation is reduced.

[0010] Furthermore, a third mounting cavity is coaxially provided on the upper part of the second bearing housing, and the thrust roller bearing is coaxially disposed in the third mounting cavity. The inner diameter of the third mounting cavity matches the outer diameter of the thrust roller bearing, and the lower outer diameter of the bearing cover matches the inner diameter of the thrust roller bearing.

[0011] Furthermore, a first grease layer is provided between the thrust roller bearing and the third mounting cavity.

[0012] The beneficial effect of adopting the above technical solution is that this setting further reduces interference with rotor rotation.

[0013] Furthermore, the second bearing housing is uniformly provided with multiple self-aligning anti-rotation holes for inserting self-aligning anti-rotation bolts along the circumference; multiple first vertical lines and multiple second vertical lines are respectively provided on the outer circular surfaces of the first bearing housing and the second bearing housing. When the multiple first vertical lines are aligned with the multiple second vertical lines, the axes of the multiple self-aligning anti-rotation bolts coincide with the symmetrical center lines of the multiple self-aligning anti-rotation holes.

[0014] The beneficial effects of adopting the above technical solution are as follows: This setting allows for stable adjustment of the horizontal position of the second bearing housing, and also facilitates confirmation during assembly and use that the multiple self-aligning anti-rotation bolts are aligned with the multiple self-aligning anti-rotation holes respectively.

[0015] Furthermore, the self-aligning anti-rotation hole is a flat-bottomed, waist-shaped hole, and the diameter of the self-aligning anti-rotation hole matches the outer diameter of one end of the self-aligning anti-rotation bolt.

[0016] The beneficial effects of adopting the above technical solution are as follows: This setting avoids the inability to adjust the horizontal position of the second bearing seat due to interference between the self-aligning anti-rotation bolt and the side wall of the self-aligning anti-rotation hole during fine-tuning.

[0017] Furthermore, a second layer of grease is provided on the steel ball.

[0018] The beneficial effect of adopting the above technical solution is that this arrangement allows the three steel balls to be lubricated and rolled between the pad and the second bearing housing, thereby reducing rolling friction resistance.

[0019] Furthermore, a marking ring is coaxially provided on the upper end of the first bearing housing, and the diameter of the marking ring matches the upper outer diameter of the second bearing housing.

[0020] The beneficial effect of adopting the above technical solution is that, with this setting, when installing the second bearing housing, the first bearing housing and the second bearing housing can be basically adjusted to be concentric according to this marking ring line.

[0021] Furthermore, the positioning connector is a positioning pin coaxially connected to the upper end of the bearing cover, and the positioning pin is coaxially connected to the center hole at the lower end of the rotor.

[0022] The beneficial effect of adopting the above technical solution is that by coaxially connecting the positioning pin to the center hole at the lower end of the rotor, the rotor is coaxially connected to the upper end of the bearing cover.

[0023] Furthermore, the three steel balls are of the same specification, and the bottom of the second mounting cavity and the bottom of the limiting cavity are both set horizontally.

[0024] The beneficial effects of this invention are as follows:

[0025] The three steel balls simultaneously bear the large load during jacking to avoid excessive concentration of force, thereby reducing deformation of the steel balls or pads and achieving stable support at three points, which helps improve reliability. Whether in the installation state or the jacking state, the self-aligning device can adjust the horizontal position of the second bearing housing through these self-aligning anti-rotation bolts, which facilitates the adjustment of the horizontal position of the bearing cover. Furthermore, the thrust roller bearing can be dynamically centered, which is beneficial for adjusting the center of the rotor relative to the stator, thereby improving self-aligning efficiency. Attached Figure Description

[0026] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0027] Figure 1 A schematic diagram of the structure of the present invention is shown;

[0028] Figure 2 Showing Figure 1 Sectional view at point AA;

[0029] Figure 3 A schematic diagram illustrating the use of the present invention is shown;

[0030] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0031] Figure label:

[0032] 1. First bearing housing; 101. First mounting cavity; 2. Second bearing housing; 201. Self-aligning anti-rotation hole; 202. Limiting cavity; 203. Third mounting cavity; 3. Self-aligning anti-rotation bolt; 4. Steel ball; 5. Spacer block; 501. Second mounting cavity; 6. Thrust roller bearing; 7. Bearing cap; 8. Locating pin; 9. Hydraulic jack; 10. High-pressure oil jack system; 11. Rotor; 12. Stator; 13. Lower thrust bearing; 14. Thrust head; 15. Upper thrust bearing; 16. Torque wrench; 17. Flywheel; 18. Dial indicator. Detailed Implementation

[0033] The invention will now be further described with reference to the accompanying drawings.

[0034] For many years, the main pump motor has used hydraulic jacks and a single steel ball structure as a jacking and self-aligning device to lift the rotor. However, due to the large load during jacking and the concentrated force application point of the single steel ball structure, the steel balls and steel ball pads are prone to deformation or cracking during use. This results in a short service life, high replacement frequency, and increased operating costs for the single steel ball structure. Furthermore, deformation of the steel balls and pads affects the accuracy of the jacking test data, leading to deviations in subsequent bearing shim fitting calculations. This results in unqualified bearing clearances during re-jacking inspections, frequent rework, increased labor costs from repetitive operations, and extended production cycles. Additionally, deformation of the steel balls and pads increases the friction contact area, causing the rotor resistance torque test value to be too high (>600 N·m) and fail. The single steel ball structure cannot accurately adjust the rotor's center relative to the stator while jacked, requiring a crane for lifting before self-alignment, which is inconvenient and inefficient.

[0035] Therefore, the present invention provides a self-aligning device, such as... Figure 2As shown, it includes a first bearing housing 1, a first mounting cavity 101 coaxially disposed on the upper part of the first bearing housing 1, a pad 5 coaxially disposed on the bottom of the first mounting cavity 101, a second mounting cavity 501 coaxially disposed on the upper part of the pad 5, three steel balls 4 with their inner sides in contact are placed in the second mounting cavity 501, a second bearing housing 2 is connected to the upper end of the first bearing housing 1, and the lower end of the second bearing housing 2 extends into the first mounting cavity 101 and is provided with a limiting cavity 20 for restricting the outer sides of the three steel balls 4. 2. The upper end of the second bearing housing 2 is coaxially rotatably connected to the bearing cover 7 via the thrust roller bearing 6. The positioning pin hole on the bearing cover 7 is coaxially fixedly connected to the positioning pin 8 for coaxially fixing the rotor 11. Four self-aligning anti-rotation bolts 3 are evenly arranged circumferentially on the first bearing housing 1 for adjusting the horizontal position of the second bearing housing 2. The screw end of the self-aligning anti-rotation bolt 3 is threaded to the first bearing housing 1 and then radially inserted into the second bearing housing 2. The thrust roller bearing 6 is a radial tapered roller thrust bearing.

[0036] Understandably, the three steel balls 4 bear a large load during lifting to avoid excessive concentration of force, thereby reducing deformation of the steel balls 4 or the pad 5. This facilitates stable support of the upper rotor 11 by the three steel balls 4 at three points and improves reliability. Whether in the installation state or the lifting state, the lifting self-aligning device can adjust the horizontal position of the second bearing seat 2 through these self-aligning anti-rotation bolts 3, thereby adjusting the horizontal position of the lifting rotor 11. The thrust roller bearing 6 can be dynamically centered, which is beneficial for adjusting the center of the rotor 11 relative to the stator 12, thus improving the self-aligning efficiency. In addition, the lifting self-aligning device can achieve dynamic centering, rotation and stable lifting functions due to the upper radial tapered roller thrust bearing 6. After the rotor 11 is coaxially connected by the positioning pin 8, the axis center of the rotor 11 can be concentric with the rotation center of the thrust roller bearing 6. In summary, this lifting and self-aligning device can meet the functional requirements of load bearing, rotation, and translation self-alignment, and it ingeniously integrates the load bearing and rotation functions with the center translation function into one. This lifting and self-aligning device achieves both functional balance and compact structure, and has the advantages of high reliability, ease of use, and convenient maintenance.

[0037] In one embodiment, the upper part of the second bearing housing 2 is coaxially connected to a thrust roller bearing 6, and the lower part of the bearing cover 7 is coaxially inserted into the thrust roller bearing 6.

[0038] Understandably, the thrust roller bearing 6 can achieve dynamic centering so that the axis center of the rotor 11 is concentric with the rotation center of the thrust roller bearing 6, and reduces interference with the rotation of the rotor 11.

[0039] In one embodiment, a third mounting cavity 203 is coaxially provided on the upper part of the second bearing housing 2, and the thrust roller bearing 6 is coaxially disposed in the third mounting cavity 203. The inner diameter of the third mounting cavity 203 matches the outer diameter of the thrust roller bearing 6, and the lower outer diameter of the bearing cover 7 matches the inner diameter of the thrust roller bearing 6.

[0040] In one embodiment, a first grease layer is provided between the thrust roller bearing 6 and the third mounting cavity 203 to further reduce interference with the rotation of the rotor 11.

[0041] In one embodiment, the second bearing housing 2 is uniformly provided with four self-aligning anti-rotation holes 201 for inserting self-aligning anti-rotation bolts 3 along the circumference; the outer circular surfaces of the first bearing housing 1 and the second bearing housing 2 are respectively provided with multiple first vertical lines and multiple second vertical lines. When the multiple first vertical lines are aligned with the multiple second vertical lines, the axes of the multiple threaded holes for installing the multiple self-aligning anti-rotation bolts 3 coincide with the symmetrical center lines of the multiple self-aligning anti-rotation holes 201.

[0042] Understandably, this setting is intended to stabilize the horizontal position of the second bearing housing 2, and also to facilitate confirmation during assembly and use that the multiple threaded holes of the multiple self-aligning anti-rotation bolts 3 are aligned with the multiple self-aligning anti-rotation holes 201.

[0043] In one embodiment, such as Figure 1 As shown, the self-aligning anti-rotation hole 201 is a flat-bottomed waist-shaped hole with an appropriate waist length. The diameter of the self-aligning anti-rotation hole 201 matches the outer diameter of one end of the self-aligning anti-rotation bolt 3. This is designed to avoid the inability to adjust the horizontal position of the second bearing seat 2 due to interference between the self-aligning anti-rotation bolt 3 and the side wall of the self-aligning anti-rotation hole 201 during fine-tuning.

[0044] It should be noted that the lifting and self-aligning device can be flexibly moved within a range of -5mm to +5mm in the horizontal direction to facilitate fine-tuning.

[0045] In one embodiment, a second grease layer is provided on the steel ball 4 so that the three steel balls can roll and adjust between the pad 5 and the second bearing seat 2.

[0046] In one embodiment, a marking ring is coaxially provided on the upper end of the first bearing housing 1, and the diameter of the marking ring matches the upper outer diameter of the second bearing housing 2. This arrangement is such that when the second bearing housing 2 is installed, the first bearing housing 1 and the second bearing housing 2 can be substantially aligned to be concentric based on the marking ring.

[0047] In one embodiment, the positioning connector is a positioning pin 8 coaxially connected to the upper end of the bearing cover 7, and the positioning pin 8 is coaxially connected to the center hole at the lower end of the rotor 11.

[0048] It is understandable that the rotor 11 is coaxially positioned and connected to the locating pin hole of the bearing cover 7 by coaxially connecting the locating pin 8 to the center hole at the lower end of the rotor 11.

[0049] In one embodiment, the three steel balls 4 are of the same size, and the bottom of the second mounting cavity 501 and the bottom of the limiting cavity 202 are both horizontally arranged.

[0050] This invention can be used for rotor 11 self-alignment, such as... Figure 2 and Figure 3 As shown, the specific steps include:

[0051] The self-aligning device is assembled by lifting it up; specifically, the first bearing housing is placed on the assembly platform, and then the pad 5 and steel ball 4 are installed into the first bearing housing 1 in sequence; at the same time, the thrust roller bearing 6 and bearing cover 7 are installed into the second bearing housing 2; according to the marking ring lines, the self-aligning anti-rotation bolt 3 is used to install the second bearing housing 2 basically concentrically onto the first bearing housing 1.

[0052] The rotor 11 is lifted and inserted into the inner hole of the stator 12. The axis center of the rotor 11 is initially adjusted by the air gap pad so that the axis center of the rotor 11 is basically coincident with the axis center of the stator 12. The hydraulic jack 9 is placed in the center of the assembly platform. Then the lifting and self-aligning device is placed on the hydraulic jack 9, and the center hole of the rotor 11 is connected to the positioning pin 8 of the lifting and self-aligning device so that the rotor 11 is supported on the lifting and self-aligning device.

[0053] Tighten the self-aligning anti-rotation bolt 3 to achieve a quick, convenient and accurate adjustment of the axis center of rotor 11 within the range of -5mm to +5mm.

[0054] Subsequently, this invention can also be used for jacking tests, specifically including the following steps:

[0055] The positioning pin 8 is coaxially connected to the center hole on the rotor 11 to center the lifting self-aligning device with the axis center of the rotor 11.

[0056] Start the hydraulic jack 9 to lift the thrust head 14 from the state where it is stationary on the lower thrust bearing 13 to the state where it is in close contact with the upper thrust bearing 15 by lifting the self-aligning device.

[0057] The actual value of the thrust bearing clearance is then calculated by measuring the changes in the readings of three dial gauges 18, which are respectively installed between the thrust head 14 and the thrust bearing housing. The bearing clearance is then ensured to meet the design requirements by grinding the bearing adjusting shims.

[0058] Compared to a single steel ball structure, this lifting and self-aligning device can vertically and smoothly lift the ball upwards under a specified load, resulting in more accurate lifting test data. It avoids the problems of component deformation, component damage, or axial misalignment during lifting that can easily occur with a single steel ball structure due to concentrated load, thus preventing inaccurate test data and frequent rework.

[0059] Finally, the present invention can also be used for drag torque testing, specifically including the following steps:

[0060] After the flywheel 17 is installed, the hydraulic jack 9 is started to apply the specified lifting load value to the rotor 11 in steps through the lifting self-aligning device.

[0061] Start the high-pressure hydraulic jacking system 10, and apply torque to the shaft end of the rotor 11 with a torque wrench 16 at the maximum jacking load of 690KN to conduct a rotor 11 resistance torque test.

[0062] It should be noted that the resistance torque test requires the resistance torque value of rotor 11 to be less than 600 N·m. However, in actual use, the measured resistance torque value of rotor 11 is around 400 N·m, which fully meets the resistance torque test requirements. Compared with the single steel ball structure, this jacking and self-aligning device has the characteristics of uniform load distribution and low bearing friction coefficient, and there is no problem of load concentration, thus avoiding deformation or damage caused by load concentration. This avoids the phenomenon of rework due to failure in the resistance torque test, thereby effectively improving the stability and service life.

[0063] In the description of this invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0064] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. A self-aligning device for lifting, characterized in that, The system includes a first bearing housing (1), a first mounting cavity (101) coaxially disposed on the upper part of the first bearing housing (1), a pad (5) coaxially disposed on the bottom of the first mounting cavity (101), a second mounting cavity (501) coaxially disposed on the upper part of the pad (5), three steel balls (4) with their inner sides in contact are placed in the second mounting cavity (501), a second bearing housing (2) is connected to the upper end of the first bearing housing (1), and the lower end of the second bearing housing (2) extends into the first mounting cavity (101) and is provided with a restraint for the three steel balls. The limiting cavity (202) on the outside of the ball (4) is connected to the upper end of the second bearing seat (2) through the thrust roller bearing (6) and the bearing cover (7) is coaxially rotatably connected to the upper end of the bearing cover (7) and the positioning connector for coaxially fixing the rotor (11) is coaxially fixedly connected to the upper end of the bearing cover (7); at least three self-aligning anti-rotation bolts (3) for adjusting the horizontal position of the second bearing seat (2) are evenly arranged on the first bearing seat (1) along the circumference. The screw end of the self-aligning anti-rotation bolt (3) is threaded to the first bearing seat (1) and then radially inserted into the second bearing seat (2); The three steel balls (4) are identical in size, and the bottom of the second mounting cavity (501) and the bottom of the limiting cavity (202) are both horizontally positioned.

2. The self-aligning device according to claim 1, characterized in that, The upper part of the second bearing housing (2) is coaxially connected to the thrust roller bearing (6), and the lower part of the bearing cover (7) is coaxially inserted into the thrust roller bearing (6).

3. The self-aligning device according to claim 2, characterized in that, The upper part of the second bearing housing (2) is coaxially provided with a third mounting cavity (203), and the thrust roller bearing (6) is coaxially disposed in the third mounting cavity (203). The inner diameter of the third mounting cavity (203) matches the outer diameter of the thrust roller bearing (6), and the lower outer diameter of the bearing cover (7) matches the inner diameter of the thrust roller bearing (6).

4. The self-aligning device according to claim 3, characterized in that, A first grease layer is provided between the thrust roller bearing (6) and the third mounting cavity (203).

5. A lifting and self-aligning device according to claim 1, characterized in that, The second bearing housing (2) is uniformly provided with a plurality of self-aligning anti-rotation holes (201) for inserting the self-aligning anti-rotation bolts (3) along the circumference; the outer circular surfaces of the first bearing housing (1) and the second bearing housing (2) are respectively provided with a plurality of first vertical lines and a plurality of second vertical lines. When the plurality of first vertical lines are aligned with the plurality of second vertical lines, the axes of the plurality of self-aligning anti-rotation bolts (3) coincide with the symmetrical center lines of the plurality of self-aligning anti-rotation holes (201).

6. A lifting and self-aligning device according to claim 5, characterized in that, The self-aligning anti-rotation hole (201) is a flat-bottomed waist-shaped hole, and the diameter of the self-aligning anti-rotation hole (201) matches the outer diameter of one end of the self-aligning anti-rotation bolt (3).

7. The self-aligning device according to claim 1, characterized in that, A second grease layer is provided on the steel ball (4).

8. A lifting and self-aligning device according to claim 1, characterized in that, The upper end of the first bearing housing (1) is coaxially provided with an identification ring engraving line, the diameter of which matches the upper outer diameter of the second bearing housing (2).

9. A lifting and self-aligning device according to claim 1, characterized in that, The positioning connector is a positioning pin (8) coaxially connected to the upper end of the bearing cover (7), and the positioning pin (8) is coaxially connected to the center hole at the lower end of the rotor (11).

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