Lifting and turning structure for 1200a stator core and method of using same

Abstract

The application discloses a lifting and turning structure suitable for a 1200A stator core and a using method thereof, and the lifting and turning structure is an inner circle through type locking structure of the stator core, comprising a plurality of pull rods, the upper end of each pull rod is penetrated through a top plate, the lower end of the pull rod is penetrated through a bottom plate, the two ends of the pull rod are respectively provided with locking nuts which are threadedly connected with the pull rod, the top plate is connected with a lifting hook and a shackle, and the bottom plate is connected with a turning bottom frame. The application finds the stress position suitable for lifting and turning of the 1200A stator core by adopting the mode that the lifting and turning tool is connected with the inner circle of the stator core; the through type locking structure is adopted, so that the stator core is in an integral and uniformly distributed stress state in the process of lifting and turning, not only the product rigidity and the strength safety factor of the stator core in the process of lifting and turning are improved, but also the structure is completely matched with the current stator core pressing scheme.

Description

Technical Field

[0001] This invention relates to a lifting and turning structure suitable for 1200A stator cores and its usage method, belonging to the field of steam turbine generator technology. Background Technology

[0002] The stator core is the core component of a steam turbine generator, such as... Figure 1 As shown, it consists of components such as lamination 9-1, through-bolt 9-6, support rib 9-2, clamping ring 9-3, toothed pressure plate 9-5, and pressure ring 9-4. When the press-fitting process is completed, the stator core 9 is in a vertical position. Before proceeding to the next process of stator winding, the stator core 9 must be rotated 90° from its vertical position to a horizontal position. Then, the stator core 9 is placed on the roller shelf for stator winding.

[0003] like Figure 2 As shown, the traditional lifting and turning structure uses a method of connecting the lifting and turning tool to the outer circle of the stator core. Usually, the lifting and turning tool is directly installed on the clamping ring on the outer circle of the core to achieve vertical lifting and 90° turning of the stator core. The clamping ring on the outer circle of the core is the main force-bearing part.

[0004] Due to structural differences and varying production standards, the clamping ring on the outer circumference of the 1200A stator core cannot be used as a lifting load-bearing component. This means that the traditional lifting and turning structure described above is not suitable for the 1200A stator core. Therefore, this technical field urgently needs a new lifting and turning structure and method to achieve vertical lifting and 90° turning of the 1200A stator core; and this new structure and method should be applicable to the current stator core pressing scheme, meaning that the installation of the lifting and turning tools will not conflict with the existing pressing process. Summary of the Invention

[0005] The technical problem to be solved by this invention is: how to achieve vertical lifting and 90° turning of the 1200A stator core.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is to provide a lifting and turning structure suitable for 1200A stator cores. The lifting and turning structure is a stator core inner circle through-type locking structure, including multiple tie rods. The upper end of each tie rod passes through the top plate, and the lower end of the tie rod passes through the bottom plate. Locking nuts are provided at both ends of the tie rod and are threadedly connected to them. Lifting hooks and shackles are connected to the top plate, and a turning base frame is connected to the bottom plate.

[0007] Preferably, the turning base frame is provided with a convex shaft and multiple pads on the side near the base plate, the multiple pads are evenly distributed around the convex shaft, and both ends of the turning base frame are provided with cylinders; the convex shaft is inserted into the center hole of the base plate, and the pads are in contact with the pressure ring surface at the bottom of the stator core; the base plate is fixedly connected to the turning base frame.

[0008] Preferably, the outer circle of the base plate is provided with a screw, and the outer circle of the base plate is pressed against the pressure ring surface at the bottom of the stator core by the screw.

[0009] Preferably, it also includes a tie rod support structure connected to the stator core after flipping; the tie rod support structure includes a horizontal beam installed in the inner circular groove of the stator core, a threaded support rod installed at the upper end of the beam, and a lifting rope connected to the lower end of the beam; the multiple tie rods located at the upper and lower positions of the beam are completely supported on the tie rod support structure, thereby relieving the contact force relationship between the tie rods and the bottom plate and the top plate.

[0010] Preferably, one end of the threaded support rod is connected to the upper end of the crossbeam, and the other end of the threaded support rod supports at least two tie rods; one end of the suspension rope is connected to the lower end of the crossbeam, and the other end of the suspension rope is hung with at least two tie rods.

[0011] A method for using a lifting and turning structure suitable for 1200A stator cores, characterized by comprising the following steps: Step 1: Place the base plate on the press-fit base beforehand; Step 2: After the stator core is manufactured, use a steel wire rope to pass through the core cavity of the stator core, connect and lift the base plate. The base plate is close to the bottom of the stator core. Then use a jack to support the base plate and remove the steel wire rope. Step 3: Secure the pre-installed top plate, hanging brackets, and shackles tightly to the top of the stator core; Step 4: Lift at least 4 tie rods and pass them through the tie rod holes on the top and bottom plates. Lock the tie rods at the top of the top plate and the bottom of the bottom plate with lock nuts. Remove the jacks under the bottom plate. Then lift the stator core and remove it from the press-fit base station. Step 5: Place the turning base frame on the square box beforehand, and support the turning base frame in the middle with a jack; Step 6: Hoist the stator core onto the turning frame and secure it in place; Step 7: Based on the dimensions of the 1200A stator core, pre-arrange the turning rack and pad box at the turning station; Step 8: Place the cylinder on the turning base frame onto the turning shelf, and the stator core will begin to turn until it changes from a vertical position to a horizontal position, with one end of the stator core resting on the pad box.

[0012] Preferably, the top plate is installed inside the pressure ring at the top of the stator core and is in close contact with the top toothed pressure plate, with the outer circle of the top plate and the inner circle of the pressure ring at the top of the stator core having a clearance fit; the bottom plate is installed inside the pressure ring at the bottom of the stator core and is in close contact with the bottom toothed pressure plate, with the outer circle of the bottom plate and the inner circle of the pressure ring at the bottom of the stator core having a clearance fit.

[0013] Preferably, the method further includes the following steps: Step 9: Horizontally place the stator core onto the V-shaped shelf; Step 10: First, remove the turning base frame, then enter the iron core chamber through the center hole of the base plate to install the tie rod support structure; Step 11: Remove the top and bottom plates that are secured with hanging hooks and shackles respectively; Step 12: First, remove the tie rod located at the lower end of the stator core after flipping it over. Place the tie rod on the slide plate inside the core and use the fixed pulley mechanism to pull the tie rod out of the core in sequence. Then, remove the tie rod located at the upper end of the stator core after flipping it over in the same way.

[0014] Preferably, the method for installing the tie rod support structure inside the core in step 10 is as follows: First, insert both ends of the multiple crossbeams included in the tie rod support structure into the inner circular grooves of the stator core. Then, install one end of the multiple threaded struts included in the tie rod support structure onto half of the crossbeams. Adjust the position of the threaded struts on the crossbeams so that the threaded struts abut against the upper tie rod. Then, use the multiple lifting ropes included in the tie rod support structure to connect one end to the remaining half of the crossbeams and hang the other end on the lower tie rod. The number of crossbeams, threaded struts, and lifting ropes are the same.

[0015] This invention identifies the stress-bearing components suitable for lifting and turning 1200A stators by connecting the lifting and turning tool to the inner circle of the stator core. Through a through-type locking structure, the stator core is subjected to uniform stress throughout the lifting and turning process, improving the product rigidity and strength safety factor and avoiding the risk of stress concentration damaging product rigidity. This structure is also perfectly compatible with current stator core pressing schemes. Furthermore, the use of a tie-rod support structure breaks down the originally tightly integrated lifting and turning tool into individual stress-bearing components, significantly reducing the difficulty of disassembling large lifting and turning tools.

[0016] The advantages of this invention are: it adopts a new method of connecting the lifting and turning tool with the stator core, which solves the problem that the outer circle clamping ring of the 1200A stator core cannot be used as a lifting force-bearing part; at the same time, it improves the force-bearing method of lifting and turning, thereby increasing the product rigidity and strength safety factor of the stator core during the lifting and turning process; and the new structure and method are fully compatible with the current stator core pressing scheme. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the stator core structure; Figure 2 This is a schematic diagram of a traditional stator core lifting and turning structure. Figure 3 This is a schematic diagram of the stator core lifting and turning structure of the present invention; Figure 4This is a schematic diagram of the base plate installation in this invention; Figure 5 This is a schematic diagram showing the top plate, hanging bracket, and shackle installed as a single unit in this invention; Figure 6 This is a schematic diagram showing the installation and positioning of the turning base frame and base plate in this invention; Figure 7 This is a schematic diagram of the stator core flipping in this invention; Figure 8 This is a schematic diagram of the disassembly of the turning base frame in this invention; Figure 9 This is a schematic diagram of the tie rod support structure installed inside the iron core in this invention; Figure 10 This is a schematic diagram of the disassembly of the bottom plate and top plate in this invention; Figure 11 This is a schematic diagram of the disassembly of the pull rod in this invention. Detailed Implementation

[0018] To make the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0019] This invention provides a lifting and turning structure suitable for 1200A stator cores. By analyzing the structural rigidity and production standards of the 1200A stator core, the method of connecting the lifting and turning tool to the inner circle of the stator core was determined. Specifically, the lifting and turning structure of this invention is a through-type locking structure for the inner circle of the stator core, used for lifting and turning the 1200A stator core from a vertical to a horizontal state. Figures 3-7 As shown, it includes a top plate 1, a lifting hook 2, a shackle 3, a tie rod 4, a base plate 5, a locking nut 6, a turning base frame 7, and a tie rod support structure 8. The upper end of the tie rod 4 passes through the top plate 1, and the lower end of the tie rod 4 passes through the base plate 5. Both ends of the tie rod 4 are equipped with locking nuts 6 for fastening the top plate 1 and the base plate 5. The lifting hook 2 and the shackle 3 are installed on the top plate 1, and the turning base frame 7 is installed on the base plate 5. After the stator core 9 is turned over, the tie rod support structure 8 is installed inside the core cavity. The base plate 5 has a screw 5-2 on its outer circle. The flipping base frame 7 has a convex shaft 7-1, a pad 7-2, and a cylinder 7-3. Both ends of the flipping base frame 7 have cylinders 7-3. During installation, the convex shaft 7-1 on the flipping base frame 7 is inserted into the center hole of the base plate 5. The pad 7-2 (thickness adjustable) on the flipping base frame 7 contacts the surface of the pressure ring 9-4 at the bottom of the stator core 9. Then, the flipping base frame 7 and the base plate 5 are fixed with bolts to complete the installation and fixing of the flipping base frame 7 and the base plate 5.

[0020] The lifting hook 2 and shackle 3 are pre-installed on the top plate 1. The top plate 1 is installed inside the pressure ring 9-4 at the top of the stator core 9 and is tightly attached to the top toothed pressure plate 9-5. The outer circle of the top plate 1 is clearance-fitted with the inner circle of the pressure ring 9-4. The bottom plate 5 is installed inside the pressure ring 9-4 at the bottom of the stator core 9 and is tightly attached to the bottom toothed pressure plate 9-5. The outer circle of the bottom plate 5 is clearance-fitted with the inner circle of the pressure ring 9-4, and the evenly distributed screws 5-2 on the outer circle of the bottom plate 5 are pressed against the surface of the pressure ring 9-4.

[0021] Locking nut 6 is tightened after the top plate 1, bottom plate 5, and tie rod 4 are installed in place.

[0022] After the stator core 9 completes a 90° rotation, a tie rod support structure 8 is installed inside the core cavity to facilitate tie rod removal. The tie rod support structure 8 includes a horizontal beam 8-1 installed in the inner circular groove of the stator core 9, a threaded support rod 8-2 installed on the upper end of the horizontal beam 8-1 (to support the two tie rods 4 at the upper end of the horizontal beam 8-1), and a lifting rope 8-3 connected to the lower end of the horizontal beam 8-1 (to hang the two tie rods 4 at the lower end of the horizontal beam 8-1). The principle of this structure is to completely support the four tie rods 4 on the tie rod support structure 8, thereby relieving the contact force relationship between the tie rods 4 and the bottom plate 5 and the top plate 1. Subsequently, the top plate 1, the bottom plate 5, and the tie rods 4 are removed in sequence.

[0023] This invention also provides a method for using a lifting and turning structure suitable for 1200A stator cores, comprising the following steps: Step 1: Place the base plate 5 on the press-fit base 12 beforehand; Step 2: After the stator core 9 is manufactured, the base plate 5 is lifted from inside the core cavity using steel wire rope 10, as follows: Figure 4 As shown, the base plate 5 is installed in the pressure ring 9-4 at the bottom of the stator core 9 and is tightly attached to the bottom tooth pressure plate 9-5. Then, the base plate 5 is supported by the jack 11, and then the wire rope 10 is removed. Step 3: Pre-assemble the top plate 1, hanging bracket 2, and shackle 3 into a single unit, as follows: Figure 5 As shown, it is then installed inside the pressure ring 9-4 at the top of the stator core 9 and tightly attached to the toothed pressure plate 9-5 at the top; Step 4: Lift the four tie rods 4 and pass them through the four tie rod holes on the top plate 1 and the bottom plate 5. Use the locking nut 6 to lock the tie rods 4 at the upper end of the top plate 1 and the lower end of the bottom plate 5. Remove the jack 11 under the bottom plate 5. Then lift the stator core 9 and remove it from the press-fit base 12 position. Step 5: Place the turning base 7 on the square box 13 beforehand, with the turning base 7 supported in the middle by the jack 11, as follows. Figure 6 As shown; Step 6: Hoist the stator core 9 onto the turning base frame 7. Align the convex shaft 7-1 on the turning base frame 7 with the central circular hole on the base plate 5 (which serves as the main load-bearing element during the core turning process). The pad 7-2 (thickness adjustable) on the turning base frame 7 contacts the surface of the pressure ring 9-4 at the bottom of the stator core 9, and then fix it with bolts.

[0024] Step 7: Based on the dimensions of the 1200A stator core 9, pre-arrange the turning rack 15 and pad box 16 at the turning station, such as... Figure 7 As shown; Step 8: Place the cylinder 7-3 on the turning base 7 onto the turning shelf 15, and the stator core 9 begins to turn until the stator core 9 turns from a vertical state to a horizontal state, with one end of the stator core 9 resting on the pad box 16. like Figures 8-11 As shown, given that the lifting and turning structure of the 1200A stator core is a large tool, the technical solution adopted by the present invention also provides a structure that facilitates the disassembly of the lifting and turning tool, which is a tie rod support structure 8, including a crossbeam 8-1, a threaded support rod 8-2, and a lifting rope 8-3.

[0025] The present invention also provides a method for disassembling a large lifting and turning structure inside the stator core, comprising the following steps: Step 9: Horizontally lower the stator core 9 onto the V-shaped shelf 17, as follows: Figure 8 As shown; Step 10: First, remove the turning base frame 7, then enter the core cavity through the center hole of the base plate 5 to install the tie rod support structure 8, such as... Figure 9 As shown; Step 11: Remove the top plate 1 (including the hanging bracket 2 and shackle 3) and the bottom plate 5 respectively; Step 12: First, remove the two tie rods 4 at the lower end (located inside the stator core 9 after flipping over), place the two tie rods 4 on the slide plate 19 inside the core, and use the fixed pulley mechanism 18 to pull the tie rods 4 out of the core in sequence; then remove the two tie rods 4 at the upper end in the same way.

[0026] like Figure 4 As shown, the installation method of the base plate 5 provided by the present invention is as follows: the base plate 5 is lifted from the iron core using a steel wire rope, the base plate 5 is installed in the bottom pressure ring and is tightly attached to the bottom tooth pressure plate, the base plate 5 is then supported by a jack, and then the steel wire rope is removed.

[0027] like Figure 5 As shown, the method for installing the top plate 1, the hanging bracket 2, and the shackle 3 into one unit according to the present invention is as follows: first, the hanging bracket 2 is positioned, then the top plate 1 is fitted into the hanging bracket 2, and finally the shackle 3 is installed on the hanging bracket 2.

[0028] like Figure 6As shown, the installation method of the turning base frame 7 and the base plate 5 provided by the present invention is as follows: the stator core 9 is hoisted onto the turning base frame 7, the convex shaft 7-1 on the turning base frame 7 is aligned with the center hole on the base plate 5 (as the main load-bearing part of the core turning process), the pad 7-2 (thickness adjustable) on the turning base frame 7 contacts the surface of the pressure ring 9-4 at the bottom of the stator core 9, and then the bolts are used to fix it.

[0029] like Figure 7 As shown, the stator core 9 is flipped using the present invention: the cylinder 7-3 on the flipping base 7 is placed on the flipping shelf 15, and the stator core 9 begins to flip until it flips from a vertical state to a horizontal state.

[0030] like Figure 8 As shown, the disassembly method of the turning base frame 7 provided by the present invention is as follows: After removing the fastening bolts, the turning base frame 7 is horizontally removed from the base plate 5 by using a crane to lift and hoist to adjust the level, and then the end of the tie rod 4 is moved horizontally out, and finally the turning base frame 7 is lifted vertically away.

[0031] like Figure 9 As shown, the installation method of the tie rod support structure 8 in the iron core is as follows: First, insert the two ends of the 6 crossbeams 8-1 into the inner circular grooves of the stator iron core 9. Then, install one end of the 6 threaded support rods 8-2 onto the 3 crossbeams 8-1. Adjust the position of the threaded support rods 8-2 on the crossbeams 8-1 so that the threaded support rods 8-2 abut against the 2 tie rods 4 at the upper end. Then, use 6 hanging ropes 8-3 to connect one end to the other 3 crossbeams 8-1 and hang the other end on the 2 tie rods 4 at the lower end.

[0032] like Figure 10 As shown, the method for disassembling the top plate 1 (including the lifting arm 2 and the shackle 3) and the bottom plate 5 provided by the present invention is as follows: by using a crane to lift and the hoist to adjust the level, the top plate 1 (including the lifting arm 2 and the shackle 3) and the bottom plate 5 are horizontally detached from the tie rod 4, taking care to avoid mutual contact during the process.

[0033] like Figure 11 As shown, the method for disassembling the pull rod 4 provided by the present invention is as follows: First, remove the two lower pull rods, place the two pull rods 4 on the slide plate 19 inside the iron core, and use the fixed pulley mechanism 18 to pull the pull rods 4 out of the iron core in sequence; then remove the two upper pull rods in the same way.

Claims

1. A method for using a lifting and turning structure suitable for 1200A stator cores, characterized in that, The lifting and turning structure is a stator core inner circle through-locking structure, including multiple tie rods. The upper end of each tie rod passes through the top plate, and the lower end of the tie rod passes through the bottom plate. Each tie rod has a locking nut threadedly connected to both ends. The top plate is connected to a lifting hook and a shackle, and the bottom plate is connected to a turning base frame. Both ends of the turning base frame are provided with cylinders. It also includes a tie rod support structure connected to the stator core cavity after turning. The tie rod support structure includes a horizontal beam installed in the inner circle groove of the stator core, a threaded support rod installed at the upper end of the horizontal beam, and a lifting rope connected to the lower end of the horizontal beam. The multiple tie rods located above and below the horizontal beam are completely supported on the tie rod support structure, relieving the contact force relationship between the tie rods and the bottom plate and the top plate. The method of using the lifting and turning structure includes the following steps: Step 1: Place the base plate on the press-fit base beforehand; Step 2: After the stator core is manufactured, use a steel wire rope to pass through the core cavity of the stator core, connect and lift the base plate. The base plate is close to the bottom of the stator core. Then use a jack to support the base plate and remove the steel wire rope. Step 3: Secure the pre-installed top plate, hanging brackets, and shackles tightly to the top of the stator core; Step 4: Lift at least 4 tie rods and pass them through the tie rod holes on the top and bottom plates. Use lock nuts to lock the tie rods at the top of the top plate and the bottom of the bottom plate. Remove the jacks under the bottom plate. Then lift the stator core and remove it from the press-fit base station. Step 5: Place the turning base frame on the square box beforehand, and support the turning base frame in the middle with a jack; Step 6: Hoist the stator core onto the turning frame and secure it in place; Step 7: Based on the dimensions of the 1200A stator core, pre-arrange the turning rack and pad box at the turning station; Step 8: Place the cylinder on the turning base frame onto the turning shelf, and the stator core will begin to turn until the stator core changes from a vertical position to a horizontal position, with one end of the stator core resting on the pad box. Step 9: Horizontally place the stator core onto the V-shaped shelf; Step 10: First, remove the turning base frame, and then enter the iron core chamber through the center hole of the base plate to install the tie rod support structure; Step 11: Remove the top and bottom plates that are secured with hanging hooks and shackles respectively; Step 12: First, remove the tie rod located at the lower end of the stator core after flipping it over. Place the tie rod on the slide plate inside the core and use the fixed pulley mechanism to pull the tie rod out of the core in sequence. Then, remove the tie rod located at the upper end of the stator core after flipping it over in the same way.

2. The method of using a lifting and turning structure suitable for a 1200A stator core as described in claim 1, characterized in that, The turning base frame is provided with a convex shaft and multiple pads on the side near the base plate, with the multiple pads evenly distributed around the convex shaft; the convex shaft is inserted into the center hole of the base plate, and the pads are in contact with the pressure ring surface at the bottom of the stator core; the base plate is fixedly connected to the turning base frame.

3. The method of using a lifting and turning structure suitable for a 1200A stator core as described in claim 1, characterized in that, The base plate is provided with a screw on its outer circle, and the outer circle of the base plate is pressed against the pressure ring surface at the bottom of the stator core by the screw.

4. The method of using a lifting and turning structure suitable for a 1200A stator core as described in claim 1, characterized in that, One end of the threaded support rod is connected to the upper end of the crossbeam, and the other end of the threaded support rod supports at least two tie rods; one end of the suspension rope is connected to the lower end of the crossbeam, and the other end of the suspension rope is hung with at least two tie rods.

5. The method of using a lifting and turning structure suitable for a 1200A stator core as described in claim 1, characterized in that, The top plate is installed inside the pressure ring at the top of the stator core and is tightly attached to the top toothed pressure plate. The outer circle of the top plate is in clearance fit with the inner circle of the pressure ring at the top of the stator core. The bottom plate is installed inside the pressure ring at the bottom of the stator core and is tightly attached to the bottom toothed pressure plate. The outer circle of the bottom plate is in clearance fit with the inner circle of the pressure ring at the bottom of the stator core.

6. The method of using a lifting and turning structure suitable for a 1200A stator core as described in claim 1, characterized in that, The installation method of the tie rod support structure in the core chamber in step 10 is as follows: First, insert both ends of the multiple crossbeams included in the tie rod support structure into the inner circular grooves of the stator core. Then, install one end of the multiple threaded struts included in the tie rod support structure onto half of the crossbeams. Adjust the position of the threaded struts on the crossbeams so that the threaded struts abut against the upper tie rod. Then, use the multiple lifting ropes included in the tie rod support structure to connect one end to the remaining half of the crossbeams and hang the other end on the lower tie rod. The number of crossbeams, threaded struts, and lifting ropes are the same.

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