A large motor rotor centering tool

Abstract

The present invention discloses a large motor rotor centering fixture, comprising: an adjustment fixing frame connected to at least two adjustment assemblies; the adjustment assembly comprising: a coarse adjustment bolt holder and a coarse adjustment bolt; a fine adjustment bolt holder radially slidably connected to the coarse adjustment bolt holder; a fine adjustment bolt threadedly connected to the fine adjustment bolt holder; a first transmission member and a second transmission member contacting each other via a wedge-shaped surface, the second transmission member further being connected to a drive assembly disposed between the second transmission member and the motor rotor; the fine adjustment bolt rotating its bottom portion drives the first transmission member downward, thereby causing the second transmission member to move radially toward the motor rotor; the movement of the second transmission member drives the drive assembly to squeeze the motor rotor. The fixture has the advantages of a simple structure, coarse adjustment and fine adjustment modes, easy adjustment, and effective assistance in the precise alignment of a large motor rotor with a pump rotor, ensuring concentricity between the motor rotor and the radial bearing.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power motors, and in particular to a large motor rotor centering tool. Background Art

[0002] With the development of my country's nuclear power energy technology, the capacity of nuclear power motors used in the nuclear power sector has continued to grow, and motor equipment has continued to become larger and larger. High-performance motor equipment has attracted widespread attention worldwide. In practical applications, the motor rotor, as a crucial component of the motor, requires axis alignment during transportation or assembly to facilitate subsequent assembly. However, existing motor rotor centering devices are time-consuming, labor-intensive, and inefficient. In practical applications, they are cumbersome to operate and cannot achieve precise position control, thus affecting the quality of subsequent assembly and hindering the widespread application of the equipment. Summary of the Invention

[0003] The purpose of the present invention is to provide a large motor rotor centering tool, which combines an adjustment bracket, a coarse adjustment bolt, a fine adjustment bolt, a transmission assembly and a drive assembly, etc., and can effectively assist in the precise alignment of the large motor rotor and the pump rotor, so that the motor rotor and the radial bearing are concentric. The tool has a simple structure, has two modes of coarse adjustment and fine adjustment, is easy to adjust, can effectively improve the centering adjustment efficiency of the motor rotor, shorten the adjustment time, and shorten the installation and commissioning period.

[0004] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0005] A large motor rotor centering tool, comprising:

[0006] An adjustment bracket is mounted on the motor and arranged around the motor rotor. The adjustment bracket is connected to at least two adjustment components, and the adjustment components are symmetrically arranged.

[0007] The regulating component comprises:

[0008] A coarse adjustment bolt holder is fixedly connected to the adjustment fixing frame, and a coarse adjustment threaded hole is formed on the coarse adjustment bolt holder;

[0009] a coarse adjustment bolt, which is threadedly connected to the coarse adjustment bolt holder through the coarse adjustment threaded hole;

[0010] a fine-tuning bolt holder, which is radially slidably connected to the coarse-tuning bolt holder, wherein the bottom of the coarse-tuning bolt passes through the coarse-tuning threaded hole and can contact the fine-tuning bolt holder and drive the fine-tuning bolt holder to move radially toward the direction of the motor rotor;

[0011] A fine-tuning bolt, wherein the fine-tuning bolt holder is provided with a fine-tuning threaded hole, and the fine-tuning bolt is threadedly connected to the fine-tuning bolt holder through the fine-tuning threaded hole;

[0012] The transmission assembly includes a first transmission member and a second transmission member, the first transmission member and the second transmission member respectively include a first wedge surface and a second wedge surface, the distances of the first wedge surface and the second wedge surface from the top to the bottom to the central axis of the adjustment bracket are both increasing, the first transmission member and the second transmission member are in contact through the first wedge surface and the second wedge surface, the second transmission member is also connected to the driving assembly, the driving assembly is arranged between the second transmission member and the motor rotor, the bottom of the fine-tuning bolt passes through the fine-tuning threaded hole and can contact the first transmission member, the rotation of the fine-tuning bolt can drive the first transmission member to move downward, and then the second transmission member in contact with the first transmission member moves radially in the direction of the motor rotor, and the movement of the second transmission member drives the driving assembly to squeeze the motor rotor.

[0013] Optionally, the angle between the first wedge-shaped surface and the horizontal direction ranges from 80° to 89°;

[0014] And / or, the angle between the second wedge-shaped surface and the horizontal direction is in the range of 80° to 89°.

[0015] Optionally, the adjustment component further comprises:

[0016] A dial indicator is provided on the driving assembly and is connected to the driving assembly and the motor rotor respectively.

[0017] Optionally, the adjustment fixing frame is an annular structure, the cross-section of the annular structure is an L-shaped structure, and a through hole is provided in the vertical part; the driving assembly includes a transmission pin and a positioning block, and the positioning block is provided with a positioning groove. The transmission assembly and the positioning block are respectively located on both sides of the vertical part, one end of the transmission pin is connected to the second transmission member, and the other end passes through the through hole and is inserted into the positioning groove.

[0018] Optionally, the positioning groove includes a stress buffering gasket, and the transmission pin is inserted into the positioning groove and contacts the stress buffering gasket.

[0019] Optionally, the stress buffer gasket is a metal gasket.

[0020] Optionally, the coarse adjustment bolt holder is a hollow structure with an open top, the fine adjustment bolt holder is at least partially located in the hollow structure, and the two side walls of the coarse adjustment bolt holder are correspondingly provided with transverse through-slot structures, and the first fixing pin structure is inserted into the transverse through-slot structure and passes through the fine adjustment bolt holder in the hollow structure to limit the axial movement of the fine adjustment bolt holder, and the fine adjustment bolt holder is radially slidably connected with the coarse adjustment bolt holder through the transverse through-slot structures on the two side walls of the coarse adjustment bolt holder.

[0021] Optionally, the fine-tuning bolt retaining frame includes a transverse frame and a vertical frame connected to the transverse frame, the transmission assembly is located below the transverse frame, the transverse frame is provided with a vertical fine-tuning threaded hole, and the fine-tuning bolt is threadedly connected to the transverse frame through the fine-tuning threaded hole;

[0022] and / or, the coarse adjustment bolt holder is welded to the adjustment fixing frame;

[0023] And / or, the adjustment fixing frame is connected to eight adjustment components, each adjustment component is evenly distributed along the circumference, and the eight adjustment components are four groups of main and auxiliary adjustment components, and each group of main and auxiliary adjustment components includes two adjacent adjustment components.

[0024] Optionally, also include:

[0025] The bottom shape of the extended shaft matches the end face shape of the motor rotor, and the extended shaft is fixed to the motor rotor through a mechanical fixing device.

[0026] Optionally, the mechanical fixing device is a fixing bolt and a fixing nut, and the fixing nut is located between the top of the fixing bolt and the surface of the extended shaft.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] In a large motor rotor centering tool of the present invention, an adjustment fixing frame, a coarse adjustment bolt, a fine adjustment bolt, a transmission assembly and a drive assembly are combined, which can effectively assist in the precise alignment of the large motor rotor and the pump rotor, so that the motor rotor and the radial bearing are concentric. The tooling has a simple structure, has both coarse adjustment and fine adjustment modes, is easy to adjust, can effectively improve the centering adjustment efficiency of the motor rotor, shorten the adjustment time, and shorten the installation and commissioning period. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the three-dimensional structure of a large motor rotor centering tooling of the present invention;

[0030] Figure 2 This is a top view of a large motor rotor centering tool of the present invention;

[0031] Figure 3 for Figure 2 The cross-sectional view of the large motor rotor centering fixture along line AA;

[0032] Figure 4 for Figure 3 Partial schematic diagram of part B. DETAILED DESCRIPTION

[0033] The present invention will be further described below by describing a preferred embodiment in detail with reference to the accompanying drawings.

[0034] like Figures 1 to 3 As shown in combination, a large motor rotor centering tool of the present invention is provided, which includes an adjustment fixing frame 14 and at least two adjustment components connected thereto. The adjustment fixing frame 14 is installed and fixed on the motor and arranged around the circumference of the motor rotor. The adjustment fixing frame 14 does not move during the process of the tool centering the motor rotor. The various adjustment components connected to the adjustment fixing frame 14 are symmetrically arranged along the circumferential direction, so that each time adjustment is performed, a force can be applied to the motor rotor along the circumferential direction.

[0035] like Figure 1 As shown, this large motor rotor centering fixture also includes an extended shaft 3. The bottom shape of the extended shaft 3 matches the end face shape of the motor rotor. The extended shaft 3 is secured to the motor rotor, or motor shaft, via a mechanical fastener. In this embodiment, the mechanical fastener comprises a fixing bolt 1 and a fixing nut 2. The fixing nut 2 is positioned between the top of the fixing bolt 1 and the surface of the extended shaft 3. In practice, the fixing nut 2 is used to connect to a cranking wrench for manual cranking.

[0036] like Figures 1 to 3 As shown in the figure, in this embodiment, the adjustment assembly includes: a coarse adjustment bolt holder 6, a coarse adjustment bolt 7, a fine adjustment bolt holder 5, a fine adjustment bolt 4, a transmission assembly and a drive assembly.

[0037] Specifically, the coarse adjustment bolt holder 6 is fixedly connected to the adjustment fixing frame 14, and a coarse adjustment threaded hole is provided on the coarse adjustment bolt holder 6; the coarse adjustment bolt 7 is threadedly connected to the coarse adjustment bolt holder 6 through the coarse adjustment threaded hole. The fine adjustment bolt holder 5 is slidably connected to the coarse adjustment bolt holder 6, and the fine adjustment bolt holder 5 can move radially along the coarse adjustment bolt holder 6. The bottom of the coarse adjustment bolt 7 passes through the coarse adjustment threaded hole and can contact the fine adjustment bolt holder 5 and drive the fine adjustment bolt holder 5 to move radially toward the direction of the motor rotor. The fine adjustment bolt holder 5 is provided with a fine adjustment threaded hole, and the fine adjustment bolt 4 is threadedly connected to the fine adjustment bolt holder 5 through the fine adjustment threaded hole. Figure 4As shown, the transmission assembly includes a first transmission member 9 and a second transmission member 10. In this embodiment, both are wedge blocks. The first transmission member 9 and the second transmission member 10 respectively include a first wedge surface and a second wedge surface. The distances of the first wedge surface and the second wedge surface from the top to the bottom to the central axis of the adjustment bracket 14 tend to increase. The first transmission member 9 and the second transmission member 10 are in contact through the first wedge surface and the second wedge surface. There is a gap below the first transmission member 9 for it to move downward. The second transmission member 10 is also connected to the driving assembly, and the driving assembly is arranged between the second transmission member 10 and the motor rotor. The bottom of the fine-tuning bolt 4 passes through the fine-tuning threaded hole and can contact the first transmission member 9. The rotation of the fine-tuning bolt 4 can drive the first transmission member 9 to move downward, thereby causing the second transmission member 10 in contact with the first transmission member 9 to move radially in the direction of the motor rotor. The movement of the second transmission member 10 drives the driving assembly to extrude the extension shaft 3 and then extrude the motor rotor.

[0038] In actual use, the coarse adjustment bolt 7 is turned to move it radially toward the motor rotor. This radial movement of the coarse adjustment bolt 7 pushes the fine adjustment bolt holder 5, which it contacts, to move radially. This in turn drives the fine adjustment bolt 4, the first transmission member 9, the second transmission member 10, and the entire drive assembly to move radially, thereby pushing the extension shaft 3 and its connected motor rotor to move radially, thereby achieving coarse adjustment of the motor rotor centering. Because the coarse adjustment bolt 7 is a bolt structure, it moves radially by one pitch per rotation. Because this accuracy is far lower than the accuracy of rotor centering, this mode is considered coarse adjustment.

[0039] Based on the above, the fixture can further implement a fine-tuning mode. After the coarse-adjustment bolt 7 has roughly positioned the motor rotor, fine-tuning is required using the fine-adjustment bolt 4. The fine-adjustment bolt retainer 5 has already completed radial movement in coarse-adjustment mode; in fine-adjustment mode, it does not move. When the fine-adjustment bolt 4 is tightened, because the fine-adjustment bolt retainer 5 cannot move axially or radially, the fine-adjustment bolt 4 moves downward, pushing the first transmission member 9 downward. The downward axial movement of the first transmission member 9 pushes the second transmission member 10 radially, thereby driving the drive assembly to also move radially, thereby fine-tuning the radial position of the motor rotor.

[0040] From the above, it can be seen that when the first transmission member 9 moves downward, due to the angle of the wedge block, the radial movement distance of the second transmission member 10 and the axial movement distance of the first transmission member 9 will be in a certain ratio, and the specific ratio is related to the angle of the wedge block. When the wedge block is designed so that the axial displacement of the first transmission member 9 is much larger than the radial displacement of the second transmission member 10, there is the ability to fine-tune here. Optionally, the angle between the first wedge surface and the horizontal direction is in the range of 80° to 89°; and / or the angle between the second wedge surface and the horizontal direction is in the range of 80° to 89°. Figure 4 As shown, in this embodiment, the first wedge surface mates with the second wedge surface, and the angle between the first wedge surface and the horizontal direction is 87°. It will be appreciated that the closer the angle between the first wedge surface and the horizontal direction is to a right angle, the greater the precision of fine-tuning. The present invention does not impose any restrictions on the offset angle of the wedge surface; any method that can achieve the fine-tuning function by achieving the corresponding force conversion is acceptable.

[0041] In this embodiment, the adjustable bracket 14 is an annular structure with an L-shaped cross-section and a through-hole in its vertical section. The drive assembly includes a drive pin 11 and a positioning block 13, each of which has a positioning groove. The drive assembly and positioning block 13 are located on either side of the vertical section of the adjustable bracket 14. One end of the drive pin 11 is connected to the second transmission member 10, and the other end passes through the through-hole and is inserted into the positioning groove. The drive pin 11 limits axial movement of the second transmission member 10 but does not restrict radial movement. Furthermore, the positioning groove contains a stress buffer 12, with which the drive pin 11 contacts when inserted. In this embodiment, the stress buffer 12 is a metal washer. Furthermore, the positioning block 13 is a plastic positioning block 13. It is understood that the stress buffer 12 and / or positioning block 13 can also be made of other materials.

[0042] In this embodiment, the horizontal portion of the adjustment bracket 14 is secured to the motor via a bolt assembly 15, securing the entire centering fixture to the motor. Furthermore, the coarse adjustment bolt holder 6 is welded to the adjustment bracket 14, preventing either from moving during the entire adjustment process. It is understood that the fixing method for the adjustment bracket 14 and the coarse adjustment bolt holder 6 is not limited to the above method; other removable fixing methods are also possible, and the present invention is not limited thereto.

[0043] In this embodiment, the coarse adjustment bolt holder 6 is a hollow structure with an open top (similar to a U-shape when viewed from above). Its first end is connected to the vertical portion of the adjustment bracket 14, and its second end is provided with a coarse adjustment threaded hole. In this embodiment, the coarse adjustment bolt holder 6 is welded to the vertical portion of the adjustment bracket 14.

[0044] The fine-tuning bolt holder 5 is at least partially located within the hollow structure. The two side walls between the first and second ends of the coarse-tuning bolt holder 6 are correspondingly provided with transverse through-slot structures. A first fixing pin structure 8 is inserted into the transverse through-slot structures and extends through the fine-tuning bolt holder 5 within the hollow structure. The two side walls of the hollow structure and the first fixing pin structure 8 restrict axial movement of the fine-tuning bolt holder 5. The transverse through-slot structures and the first fixing pin structure 8 enable radial sliding connection between the fine-tuning bolt holder 5 and the coarse-tuning bolt holder 6, allowing the fine-tuning bolt holder 5 to move radially along the transverse through-slot structures. It should be noted that the coarse-tuning bolt holder 6 is not limited to the structure described above, and the connection method between the fine-tuning bolt holder 5 and the coarse-tuning bolt holder 6 is not limited to the structure described above. Other structures are also possible, as long as they can achieve the corresponding functions. For example, in another embodiment, the coarse adjustment bolt holder 6 has only one side wall with a transverse through-slot structure, and the fine adjustment bolt holder 5 is radially slidably connected to the coarse adjustment bolt holder 6 at the transverse through-slot structure through a stud bolt structure, and the fine adjustment bolt holder 5 also cannot move axially.

[0045] Furthermore, in this embodiment, the fine-tuning bolt retaining frame 5 includes a transverse frame and a vertical frame connected to the transverse frame, the transmission assembly is located below the transverse frame, the transverse frame is provided with a vertical fine-tuning threaded hole, and the fine-tuning bolt 4 is threadedly connected to the transverse frame through the fine-tuning threaded hole.

[0046] Furthermore, the adjustment assembly includes a dial indicator, which is mounted on the positioning block 13 of the drive assembly and connected to the drive assembly and the motor rotor, respectively. Once secured, the dial indicator generally does not move during adjustment and can be removed after use. In this embodiment, the dial indicator is indirectly connected to the motor rotor by connecting to the extended shaft 3 to facilitate offset measurement.

[0047] like Figure 1As shown, the adjustment fixing frame 14 is connected to eight adjustment components, and each adjustment component is evenly distributed along the circumference. The eight adjustment components are four groups of main and auxiliary adjustment components, and each group of main and auxiliary adjustment components includes two adjacent adjustment components. When adjusting, the two adjustment components distributed at 180° are adjusted. When actually adjusting and using, the four adjustment components spaced 90° apart in the tooling are mainly selected for adjustment, and the remaining four adjustment components are auxiliary for adjustment. Of course, in actual use, other numbers of adjustment components can also be set according to actual needs, as long as the corresponding functions can be achieved, and the present invention is not limited to this. Furthermore, in this embodiment, the fixed adjustment frame is provided with an adjustment slot 16 at the corresponding position below each group of main and auxiliary adjustment components, and the bolt fixing assembly 15 fixes the fixed adjustment frame to the motor through the adjustment slot 16. During installation, its fixed position can be adjusted by rotating along the adjustment slot 16 according to the actual required position.

[0048] In actual application, first install the centering tool at the appropriate position on the upper end of the motor shaft; loosen all the coarse adjustment bolts 7; install a dial indicator at the center position of each positioning block 13, and press its thimble on the extended shaft 3; select and adjust 4 coarse adjustment bolts 7 with an interval of 90°, and use the dial indicators at the corresponding positions to confirm the dimensions of the motor shaft, i.e., the motor rotor, when it touches the radial bearing in these 4 directions, and calculate the corresponding dial indicator reading when the shaft is in the center; adjust the motor rotor to the calculated position through the coarse adjustment bolts 7 and the fine adjustment bolts 4; after the motor rotor is centered, select a wrench and install it on the fixing bolt 1 or the fixing nut 2 according to the direction of rotor rotation to align the turning with the pump rotor; after the alignment is completed, remove the centering tool.

[0049] To sum up, in a large motor rotor centering tool of the present invention, the adjustment fixing frame 14, coarse adjustment bolt 7, fine adjustment bolt 4, transmission assembly and drive assembly are combined, which can effectively assist in the precise alignment of the large motor rotor and the pump rotor, so that the motor rotor and the radial bearing are concentric. The tooling has a simple structure, has both coarse adjustment and fine adjustment modes, is easy to adjust, and can effectively improve the centering adjustment efficiency of the motor rotor, shorten the adjustment time, and shorten the installation and commissioning period.

[0050] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description is not intended to limit the present invention. After reading the above description, various modifications and substitutions of the present invention will become apparent to those skilled in the art. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A large motor rotor centering tool, characterized in that: Include: An adjustment bracket is mounted on the motor and arranged around the motor rotor. The adjustment bracket is connected to at least two adjustment components, and the adjustment components are symmetrically arranged. An extended shaft, the bottom shape of which matches the end face shape of the motor rotor, and the extended shaft is fixed to the motor rotor by a mechanical fixing device; The regulating component comprises: A coarse adjustment bolt holder is fixedly connected to the adjustment fixing frame, and a coarse adjustment threaded hole is formed on the coarse adjustment bolt holder; a coarse adjustment bolt, which is threadedly connected to the coarse adjustment bolt holder through the coarse adjustment threaded hole; a fine-tuning bolt holder, which is radially slidably connected to the coarse-tuning bolt holder, wherein the bottom of the coarse-tuning bolt passes through the coarse-tuning threaded hole and can contact the fine-tuning bolt holder and drive the fine-tuning bolt holder to move radially toward the direction of the motor rotor; A fine-tuning bolt, wherein the fine-tuning bolt holder is provided with a fine-tuning threaded hole, and the fine-tuning bolt is threadedly connected to the fine-tuning bolt holder through the fine-tuning threaded hole; The transmission assembly includes a first transmission member and a second transmission member, the first transmission member and the second transmission member respectively include a first wedge surface and a second wedge surface, the distances of the first wedge surface and the second wedge surface from the top to the bottom to the central axis of the adjustment bracket are both increasing, the first transmission member and the second transmission member are in contact with each other through the first wedge surface and the second wedge surface, the second transmission member is further connected to the driving assembly, the driving assembly is arranged between the second transmission member and the motor rotor, the bottom of the fine-tuning bolt passes through the fine-tuning threaded hole and can contact the first transmission member, the rotation of the fine-tuning bolt can drive the first transmission member to move downward, thereby causing the second transmission member in contact with the first transmission member to move radially in the direction of the motor rotor, and the movement of the second transmission member drives the driving assembly to squeeze the motor rotor; A dial indicator is provided on the driving assembly and is connected to the driving assembly and the motor rotor respectively.

2. The large motor rotor centering tool according to claim 1, characterized in that: The angle between the first wedge-shaped surface and the horizontal direction is in the range of 80° to 89°; And / or, the angle between the second wedge-shaped surface and the horizontal direction is in the range of 80° to 89°.

3. The large motor rotor centering tool according to claim 1, characterized in that: The adjustment fixing frame is an annular structure, the cross-section of the annular structure is an L-shaped structure, and a through hole is provided in the vertical part; the driving assembly includes a transmission pin and a positioning block, and the positioning block is provided with a positioning groove. The transmission assembly and the positioning block are respectively located on both sides of the vertical part, one end of the transmission pin is connected to the second transmission member, and the other end passes through the through hole and is inserted into the positioning groove.

4. The large motor rotor centering tool as claimed in claim 3, characterized in that: The positioning groove includes a stress buffering gasket, and the driving pin is inserted into the positioning groove and contacts the stress buffering gasket.

5. The large motor rotor centering tool as claimed in claim 4, characterized in that: The stress buffer gasket is a metal gasket.

6. The large motor rotor centering tool according to claim 1, characterized in that: The coarse adjustment bolt holder is a hollow structure with an open top, and the fine adjustment bolt holder is at least partially located in the hollow structure. The two side walls of the coarse adjustment bolt holder are correspondingly provided with transverse through-slot structures. The first fixing pin structure is inserted into the transverse through-slot structure and passes through the fine adjustment bolt holder in the hollow structure to limit the axial movement of the fine adjustment bolt holder, and the fine adjustment bolt holder is radially slidably connected with the coarse adjustment bolt holder through the transverse through-slot structures on the two side walls of the coarse adjustment bolt holder.

7. The large motor rotor centering tool according to claim 1, characterized in that: The fine-tuning bolt retaining frame includes a transverse frame and a vertical frame connected to the transverse frame, the transmission assembly is located below the transverse frame, the transverse frame is provided with a vertical fine-tuning threaded hole, and the fine-tuning bolt is threadedly connected to the transverse frame through the fine-tuning threaded hole; and / or, the coarse adjustment bolt holder is welded to the adjustment fixing frame; And / or, the adjustment fixing frame is connected to eight adjustment components, each adjustment component is evenly distributed along the circumference, and the eight adjustment components are four groups of main and auxiliary adjustment components, and each group of main and auxiliary adjustment components includes two adjacent adjustment components.

8. The large motor rotor centering tool according to claim 1, characterized in that: The mechanical fixing device is a fixing bolt and a fixing nut, and the fixing nut is located between the top of the fixing bolt and the surface of the extended shaft.

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