An integrated hoisting and maintenance platform for the main pump motor of a nuclear power plant

Abstract

The present invention relates to the technical field of hoisting and maintenance platforms, and discloses an integrated hoisting and maintenance platform for a nuclear power main pump motor, which includes a main body and two connecting frames. Both connecting frames are fixedly connected to the outer wall of the main body. Connecting and positioning frames are fixedly connected to the tops of both connecting frames, and a stable extension frame is fixedly connected to the tops of the two connecting and positioning frames. It also includes a hoisting mechanism arranged on the top of the main body, and the hoisting mechanism includes a hydraulic lifting column. The present invention enables the main pump motor to always be in a vertical state with respect to its original position. After the main pump motor is overhauled, the main pump motor can be vertically lowered, avoiding a large deviation between the main pump motor and its original installation position when the main pump motor is reset after the overhaul. It can reduce the adjustment range of the main pump motor, and avoid the difficulty of precisely adjusting the position of the main pump motor due to its large size and mass, thereby improving the accuracy and installation efficiency of the reset installation of the main pump motor.

Description

Technical Field

[0001] The present invention relates to the technical field of hoisting and maintenance platforms, and particularly to an integrated hoisting and maintenance platform for a nuclear power main pump motor. Background Technique

[0002] Large motors such as those in nuclear power plants need to carry out preventive maintenance work regularly. Due to their large volume and weight, the disassembly and installation of heavy components such as end covers, sliding bearings, and couplings require the use of a hoisting machine in the plant or workshop to carry out the hoisting work, so as to hoist the motor to the maintenance platform for maintenance work.

[0003] When overhauling the main pump motor, it is necessary to hoist the main pump motor to the maintenance platform by a hoisting machine and then carry out the overhaul. However, after the main pump motor is hoisted to the maintenance platform, the position where the main pump motor is located will change greatly compared with the installation joint. When the main pump motor is reset after the overhaul, there will be a large deviation between the position of the main pump motor and the installation position. And because the main pump motor generally has a relatively large size, it is difficult to accurately adjust the position of the main pump motor, thus affecting the reset installation of the main pump motor and having low practicability. Summary of the Invention

[0004] The purpose of the present invention is to provide an integrated hoisting and maintenance platform for a nuclear power main pump motor to solve the problems raised in the above background technique.

[0005] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0006] The present invention is an integrated hoisting and maintenance platform for a nuclear power main pump motor, including a main body and two connecting frames. Both connecting frames are fixedly connected to the outer wall of the main body. Connecting positioning frames are fixedly connected to the tops of both connecting frames, and a stable extension frame is fixedly connected to the tops of both connecting positioning frames. It further includes:

[0007] A hoisting mechanism, which is arranged on the top of the main body. The hoisting mechanism includes a hydraulic lifting column, which is fixedly connected to the top of the main body. The output end of the hydraulic lifting column is fixedly connected to a telescopic frame. A sliding extension column is slidably connected to the side of the telescopic frame away from the hydraulic lifting column. A heavy-duty hoist is fixedly connected to the side of the sliding extension column away from the hydraulic lifting column. A sliding hole frame is fixedly connected to the side of the heavy-duty hoist away from the sliding extension column. A sliding rod is slidably connected inside the sliding hole frame, and a limiting top plate is fixedly connected to the bottom of the sliding rod;

[0008] A merging mechanism, which is arranged on the outer wall of the stable extension frame. The merging mechanism includes a sliding column, which is slidably connected to the top of the stable extension frame. A pushing frame is fixedly connected to the bottom of the sliding column. Merging bars are rotatably connected to both sides of the pushing frame. The angle between the two merging bars is greater than sixty degrees. Merging frames are respectively rotatably connected to the ends of the two merging bars away from the pushing frame.

[0009] Further, one side of the connecting frame away from the retractable frame is fixedly connected with an extension frame. Two fitting grooves are provided at the top of the stable extension frame. An installation and fixing structure is arranged at the bottom of the main body. A sliding strip is fixedly connected to the side of the retractable frame away from the main body.

[0010] Further, the hoisting mechanism further includes two extension hydraulic cylinders. Both of the two extension hydraulic cylinders are fixedly connected to the outer wall of the heavy hoist. The output end of the extension hydraulic cylinder is fixedly connected to the outer wall of the telescopic frame. A tension spring is fixedly connected between the sliding hole frame and the top of the sliding rod. The sling at the output end of the heavy hoist slides through the limiting top plate. A connection and fixing structure is arranged at the end of the sling at the output end of the heavy hoist away from the heavy hoist. And the top of the connection and fixing structure abuts against the bottom of the limiting top plate. The top of the sliding rod abuts against the bottom of the pushing frame.

[0011] Further, the merging mechanism further includes two connecting screw rod sleeve frames. The two connecting screw rod sleeve frames are respectively fixedly connected to the sides of the two merging frames away from each other. The connecting screw rod sleeve frame slides through the connecting frame. A rotating gear screw rod is threadedly connected inside the connecting screw rod sleeve frame. The rotating gear screw rod is rotatably connected to the top of the connecting frame.

[0012] Further, a transmission gear is fixedly connected to the side of the rotating gear screw rod away from the connecting frame. Stable grooves are respectively provided on the opposite sides of the two merging frames. Limiting platform abutting frames are respectively fixedly connected to the sides of the two merging frames away from the retractable frame. The merging frame is slidably connected to the sliding strip on the retractable frame. A positioning abutting groove frame is fixedly connected to the top of the sliding column. A return spring is fixedly connected between the positioning abutting groove frame and the stable extension frame.

[0013] Further, a positioning mechanism is arranged at the top of the stable extension frame. The positioning mechanism includes two sliding columns. The two sliding columns respectively slide through the outer walls of the two connecting and positioning frames. Limiting support plates are fixedly connected to the sides of the two sliding columns close to the stable extension frame. The bottoms of the two limiting support plates abut against the fitting grooves at the top of the stable extension frame.

[0014] Further, the tops of the two limiting support plates abut against the bottom of the positioning abutting groove frame. Two limiting abutting frames are fixedly connected to the sides of the sliding column and the limiting support plate away from the stable extension frame. Shrinkage springs are fixedly connected between the limiting abutting frames between the two limiting support plates and the two sliding columns. A thrust hydraulic cylinder is fixedly connected between the two limiting support plates.

[0015] Further, a closing mechanism is arranged at the bottom of the merging frame. The closing mechanism includes a gear screw rod sleeve frame. The gear screw rod sleeve frame is rotatably connected inside the extension frame. A connecting gear is fixedly connected to the side of the gear screw rod sleeve frame away from the connecting frame. And the connecting gear meshes with the transmission gear. A fixing screw rod is threadedly connected inside the gear screw rod sleeve frame. The thread pitch on the fixing screw rod is twice the thread pitch of the rotating gear screw rod. A closing frame is fixedly connected to the side of the fixing screw rod away from the extension frame.

[0016] Furthermore, two retractable chute frames are fixedly connected to the bottom of the closed frame. A retractable groove is provided at the top of the closed frame. A through hole is penetrated and opened at the bottom of the closed frame. An inclined block is slidably connected inside the through hole. A plurality of fitting semi-circular blocks are connected to the top of the inclined block. The fitting semi-circular blocks are retracted inside the retractable groove at the top of the closed frame. An extrusion abutment frame is slidably connected inside the two retractable chute frames. A compression spring is fixedly connected between the rear wall of the extrusion abutment frame and the inner wall of the back surface of the retractable chute frame. A roller is provided at a position on the rear wall of the extrusion abutment frame corresponding to the inclined surface of the inclined block. The fitting semi-circular blocks are correspondingly used in cooperation with the stable grooves on the merging frame. There are two closing mechanisms, and the two closing mechanisms are symmetrically distributed with the main body as the center.

[0017] The present invention has the following beneficial effects:

[0018] (1) After the heavy-duty hoist of the present invention lifts the main pump motor to a certain height, the top of the connection fixing device at the bottom of the sling will abut against the limit top plate. By continuously lifting the main pump motor with the heavy-duty hoist, the push rod is pushed to rise inside the slide hole frame, and at the same time, the tension spring is stretched. When the top of the push rod abuts against the bottom of the push frame, the limit top plate and the top of the main pump motor will be above the two merging frames. When continuously driving the main pump motor to rise, the top of the push rod continuously abuts against the bottom of the push frame, so that the sliding column slides on the top of the stable extension frame, and at the same time, the reset spring is stretched. During the rising process of the push frame, the two merging bars rotate on both sides of the push frame respectively, so that the bottoms of the two merging bars approach each other, so that the connections between the push frame and the merging bars and the connections between the merging frames and the merging bars are in a perpendicular state, and at the same time, the two merging frames are merged. The outer wall of the main pump motor abuts against the inside of the stable grooves between the two merging frames, so as to stabilize the main pump motor lifted to the maintenance platform, so that the main pump motor is always perpendicular to its original position. After the main pump motor is repaired, the main pump motor can be vertically lowered, avoiding the phenomenon that there is a large deviation between the main pump motor and its original installation position when the main pump motor is reset after the repair, reducing the adjustment range of the main pump motor, and avoiding the difficulty of accurately adjusting the position of the main pump motor due to its large size and mass, improving the accuracy and installation efficiency of the reset installation of the main pump motor.

[0019] (2)During the merging process of the two merging frames of the present invention, it will drive the connection screw rod sleeve frame to move synchronously inside the connection frame. During the movement of the connection screw rod sleeve frame, it will drive the rotating gear screw rod to rotate. Since the thread pitch of the rotating gear screw rod is half of the thread pitch of the fixed screw rod, the rotation speed of the rotating gear screw rod can be increased. The gear on the rotating gear screw rod meshes with the gear on the gear screw rod sleeve frame, driving the gear screw rod sleeve frame to rotate synchronously inside the extension frame. Since the thread pitch of the fixed screw rod is greater than that of the rotating gear screw rod, the moving distance of the fixed screw rod is twice the moving distance of the merging frame. Thus, after the two merging frames are merged, the two closed frames can move to the bottom of the stable groove where the two merging frames are docked, thereby closing the bottom of the main pump motor, and preventing maintenance tools or other items from falling through the merged stable groove to the connection of the main pump motor below the maintenance platform during maintenance, avoiding affecting the reset installation of the main pump motor.

[0020] (3)During the merging process of the two closed frames of the present invention, when the two sets of extrusion abutment frames come into contact, the fitting semi-circular blocks that contract the top of the closed frame are located at the edge of the stable groove. Since the size of the fitting semi-circular blocks is smaller than the size of the stable groove on the merging frame, when the two sets of extrusion abutment frames continue to abut against each other, they squeeze the inclined surfaces of the inclined blocks on both sides, thereby driving the inclined blocks to slide upward inside the through holes, causing the fitting semi-circular blocks to move out of the top of the closed frame and into the inside of the merging frame. When the two merging frames and closed frames are spliced together, the tops of the fitting semi-circular blocks on the tops of the two closed frames abut against the bottom of the main pump motor, thereby supporting the main pump motor, and further improving the stability of the main pump motor on the maintenance platform. When the positioning abutment groove frame rises to the topmost position, the thrust hydraulic cylinder will release the force. Through the elastic force of the compression spring, the two sets of limit support plates enter between the positioning abutment groove frame and the stable extension frame, positioning the detection of the positioning abutment groove frame and the stable extension frame, preventing the positioning abutment groove frame from descending and affecting the maintenance of the main pump motor, and improving the practicability of the device.

[0021] (4)Build an installation platform for the integrated hoisting and maintenance equipment in the upper area of the main pump motor, make the integrated hoisting and maintenance platform vertically arranged above the main pump motor, and connect and fix it to the maintenance platform through the main body and the stable extension frame. Control the heavy hoist through the extension hydraulic cylinder to slide through the sliding extension column inside the telescopic frame, making the sling at the output end of the heavy hoist perpendicular to the main pump motor. After the sling at the output end of the heavy hoist is fixed to the main pump motor, start the heavy hoist to vertically lift the main pump motor and keep it suspended above the maintenance platform, facilitating workers to perform maintenance on the main pump motor on the maintenance platform.

[0022] Of course, it is not necessary for any product implementing the present invention to simultaneously achieve all the above-mentioned advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 Schematic diagram of the overall structure of the present invention;

[0025] Figure 2 Overall cross-sectional view of the present invention;

[0026] Figure 3 Schematic diagram of the positioning mechanism structure of the present invention;

[0027] Figure 4 Schematic diagram of the main body structure of the present invention;

[0028] Figure 5 Schematic diagram of the hoisting mechanism structure of the present invention;

[0029] Figure 6 Schematic diagram of the merging mechanism structure of the present invention;

[0030] Figure 7 Schematic diagram of the closing mechanism structure of the present invention;

[0031] Figure 8 is Figure 3 Enlarged view of part A in

[0032] In the drawings, the list of components represented by each reference numeral is as follows:

[0033] In the figure: 1, main body; 101, retractable frame; 102, connecting frame; 103, extending frame; 104, connecting and positioning frame; 105, stable extending frame; 2, hoisting mechanism; 201, hydraulic lifting column; 202, telescopic frame; 203, sliding extension column; 204, heavy-duty hoist; 205, extending hydraulic cylinder; 206, sliding hole frame; 207, sliding rod; 208, limiting top plate; 209, tension spring; 3, merging mechanism; 301, connecting screw rod sleeve frame; 302, rotating gear screw rod; 303, merging frame; 304, limiting platform abutment frame; 305, merging strip; 306, pushing frame; 307, sliding column; 308, reset spring; 309, positioning abutment groove frame; 4, positioning mechanism; 401, sliding column; 402, limiting support plate; 403, thrust hydraulic cylinder; 404, limiting abutment frame; 405, compression spring; 5, closing mechanism; 501, gear screw rod sleeve frame; 502, fixed screw rod; 503, closing frame; 504, retractable chute frame; 505, through hole; 506, inclined plane block; 507, fitting semi-circular block; 508, extrusion abutment frame. Detailed implementation manners

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] Example 1, please refer to Figures 1 - 8 As shown in the figure, the present invention is an integrated lifting and maintenance platform for a nuclear power main pump motor, including a main body 1 and two connecting frames 102. Both of the two connecting frames 102 are fixedly connected to the outer wall of the main body 1. Connecting and positioning frames 104 are fixedly connected to the tops of the two connecting frames 102, and a stable extension frame 105 is fixedly connected to the tops of the two connecting and positioning frames 104. It further includes:

[0036] Hoisting mechanism 2, the hoisting mechanism 2 is arranged at the top of the main body 1. The hoisting mechanism 2 includes a hydraulic lifting column 201. The hydraulic lifting column 201 is fixedly connected to the top of the main body 1. The output end of the hydraulic lifting column 201 is fixedly connected with a telescopic frame 202. A sliding extension column 203 is slidably connected to one side of the telescopic frame 202 away from the hydraulic lifting column 201. A heavy-duty hoist 204 is fixedly connected to one side of the sliding extension column 203 away from the hydraulic lifting column 201. A sliding hole frame 206 is fixedly connected to one side of the heavy-duty hoist 204 away from the sliding extension column 203. A sliding rod 207 is slidably connected inside the sliding hole frame 206. A limiting top plate 208 is fixedly connected to the bottom of the sliding rod 207. The hoisting mechanism 2 further includes two extension hydraulic cylinders 205. Both of the two extension hydraulic cylinders 205 are fixedly connected to the outer wall of the heavy-duty hoist 204. The output end of the extension hydraulic cylinder 205 is fixedly connected to the outer wall of the telescopic frame 202. A tension spring 209 is fixedly connected between the sliding hole frame 206 and the top of the sliding rod 207. The sling at the output end of the heavy-duty hoist 204 slidably penetrates through the limiting top plate 208. A connection and fixation structure is arranged at one end of the sling at the output end of the heavy-duty hoist 204 away from the heavy-duty hoist 204. And the top of the connection and fixation structure abuts against the bottom of the limiting top plate 208. The top of the sliding rod 207 abuts against the bottom of the pushing frame 306. By controlling the heavy-duty hoist 204 through the extension hydraulic cylinder 205 to slide inside the telescopic frame 202 through the sliding extension column 203, the sling at the output end of the heavy-duty hoist 204 is perpendicular to the main pump motor. After the sling at the output end of the heavy-duty hoist 204 is fixed to the main pump motor, start the heavy-duty hoist 204 to vertically lift the main pump motor. After the heavy-duty hoist 204 lifts the main pump motor to a certain height, the top of the connection and fixation device at the bottom of the sling will abut against the limiting top plate 208. By continuously lifting the main pump motor through the heavy-duty hoist 204, the sliding rod 207 is pushed to rise inside the sliding hole frame 206, and at the same time, the tension spring 209 is stretched. When the top of the sliding rod 207 abuts against the bottom of the pushing frame 306, the top of the limiting top plate 208 and the main pump motor will be above the two merging frames 303;

[0037] The merging mechanism 3 is arranged on the outer wall of the stable extension frame 105. The merging mechanism 3 includes a sliding column 307 which is slidably connected to the top of the stable extension frame 105. A pushing frame 306 is fixedly connected to the bottom of the sliding column 307. Merging bars 305 are rotatably connected to both sides of the pushing frame 306. The angle between the two merging bars 305 is greater than sixty degrees. The ends of the two merging bars 305 away from the pushing frame 306 are respectively rotatably connected to a merging frame 303. The merging mechanism 3 further includes two connecting screw rod sleeve frames 301 which are respectively fixedly connected to the mutually remote sides of the two merging frames 303. The connecting screw rod sleeve frames 301 slidably penetrate through the connecting frame 102. A rotating gear screw rod 302 is threadedly connected inside the connecting screw rod sleeve frame 301. The rotating gear screw rod 302 is rotatably connected to the top of the connecting frame 102. A transmission gear is fixedly connected to the side of the rotating gear screw rod 302 away from the connecting frame 102. Stable grooves are respectively formed on the mutually opposite sides of the two merging frames 303. Limiting platform abutting frames 304 are respectively fixedly connected to the sides of the two merging frames 303 away from the retracting frame 101. The merging frames 303 are slidably connected to the sliding strips on the retracting frame 101. A positioning abutting groove frame 309 is fixedly connected to the top of the sliding column 307. A return spring 308 is fixedly connected between the positioning abutting groove frame 309 and the stable extension frame 105. When continuously driving the main pump motor to rise, the top of the sliding rod 207 continuously abuts against the bottom of the pushing frame 306, causing the sliding column 307 to slide on the top of the stable extension frame 105 and simultaneously stretching the return spring 308. During the rising process of the pushing frame 306, the two merging bars 305 respectively rotate on both sides of the pushing frame 306, so that the bottoms of the two merging bars 305 approach each other, making the connections between the pushing frame 306 and the merging bars 305 and between the merging frames 303 and the merging bars 305 in a mutually perpendicular state, and simultaneously merging the two merging frames 303. The outer wall of the main pump motor abuts against the inside of the stable grooves between the two merging frames 303;

[0038] An extension frame 103 is fixedly connected to the side of the connecting frame 102 away from the retracting frame 101. Two fitting grooves are formed on the top of the stable extension frame 105. An installation and fixing structure is arranged at the bottom of the main body 1. A sliding strip is fixedly connected to the side of the retracting frame 101 away from the main body 1. An installation platform for the integrated hoisting and maintenance equipment is built in the upper area of the main pump motor, so that the integrated hoisting and maintenance platform is vertically arranged above the main pump motor and is connected and fixed to the maintenance platform through the main body 1 and the stable extension frame 105;

[0039] At the top of the stable extension frame 105, a positioning mechanism 4 is provided. The positioning mechanism 4 includes two sliding columns 401. The two sliding columns 401 respectively slide through the outer walls of the two connecting and positioning frames 104. On the side of the two sliding columns 401 close to the stable extension frame 105, a limiting support plate 402 is fixedly connected. The bottoms of the two limiting support plates 402 are respectively abutted against the fitting grooves at the top of the stable extension frame 105. The tops of the two limiting support plates 402 are respectively abutted against the bottom of the positioning and abutting groove frame 309. On the side of the sliding column 401 and the limiting support plate 402 away from the stable extension frame 105, two limiting abutting frames 404 are fixedly connected. A contraction spring 405 is fixedly connected between the limiting abutting frames 404 between the two limiting support plates 402 and the two sliding columns 401. A thrust hydraulic cylinder 403 is fixedly connected between the two limiting support plates 402;

[0040] At the bottom of the merging frame 303, a closing mechanism 5 is provided. The closing mechanism 5 includes a gear screw sleeve frame 501. The gear screw sleeve frame 501 is rotatably connected in the extension frame 103. On the side of the gear screw sleeve frame 501 away from the connecting frame 102, a connecting gear is fixedly connected, and the connecting gear meshes with the driving gear. A fixed screw 502 is threadedly connected inside the gear screw sleeve frame 501. The thread pitch on the fixed screw 502 is twice the thread pitch of the rotating gear screw 302. On the side of the fixed screw 502 away from the extension frame 103, a closing frame 503 is fixedly connected. At the bottom of the closing frame 503, two contraction chute frames 504 are fixedly connected. A contraction groove is opened at the top of the closing frame 503. A through hole 505 is penetrated and opened at the bottom of the closing frame 503. Inside the through hole 505, an inclined plane block 506 is slidably connected. At the top of the inclined plane block 506, a plurality of fitting semi-circular blocks 507 are connected. The fitting semi-circular blocks 507 are contracted inside the contraction groove at the top of the closing frame 503. Inside the two contraction chute frames 504, an extrusion abutting frame 508 is slidably connected. A compression spring is fixedly connected between the rear wall of the extrusion abutting frame 508 and the inner wall of the back surface of the contraction chute frame 504. At a position corresponding to the inclined plane of the inclined plane block 506 on the rear wall of the extrusion abutting frame 508, a roller is provided. The fitting semi-circular blocks 507 are correspondingly used in cooperation with the stable grooves on the merging frame 303. There are two closing mechanisms 5, and the two closing mechanisms 5 are symmetrically distributed with the main body 1 as the center. By the thread pitch of the rotating gear screw 302 being half of the thread pitch of the fixed screw 502, the rotation speed of the rotating gear screw 302 can be increased. By the gear on the rotating gear screw 302 meshing with the gear on the gear screw sleeve frame 501, the gear screw sleeve frame 501 is driven to rotate synchronously inside the extension frame 103. By the thread pitch of the fixed screw 502 being greater than the thread pitch of the rotating gear screw 302, the moving distance of the fixed screw 502 is twice the moving distance of the merging frame 303. Thus, after the two merging frames 303 are merged, the two closing frames 503 can move to the bottom of the stable grooves where the two merging frames 303 are butted, so as to close the bottom of the main pump motor.

[0041] During use, an installation platform for an integrated hoisting and maintenance device is built in the area above the main pump motor, so that the integrated hoisting and maintenance platform is vertically arranged above the main pump motor, and is connected and fixed to the maintenance platform through the main body 1 and the stable extension frame 105. The heavy-duty hoist 204 is controlled by the extension hydraulic cylinder 205 to slide inside the telescopic frame 202 through the sliding extension column 203, so that the sling at the output end of the heavy-duty hoist 204 is perpendicular to the main pump motor. After the sling at the output end of the heavy-duty hoist 204 is fixed to the main pump motor, the heavy-duty hoist 204 is started to vertically lift the main pump motor. After the heavy-duty hoist 204 lifts the main pump motor to a certain height, the top of the connection and fixing device at the bottom of the sling will abut against the limit top plate 208. By continuously lifting the main pump motor with the heavy-duty hoist 204, the slide bar 207 is pushed to rise inside the slide hole frame 206, and at the same time, the tension spring 209 is stretched. When the top of the slide bar 207 abuts against the bottom of the push frame 306, the top of the limit top plate 208 and the main pump motor will be above the two merging frames 303. When continuously driving the main pump motor to rise, the top of the slide bar 207 continuously abuts against the bottom of the push frame 306, so that the slide column 307 slides on the top of the stable extension frame 105, and at the same time, the reset spring 308 is stretched. During the rising process of the push frame 306, the two merging bars 305 rotate on both sides of the push frame 306 respectively, so that the bottoms of the two merging bars 305 approach each other, so that the connections between the push frame 306, the merging bars 305 and the connections between the merging frames 303 and the merging bars 305 are in a perpendicular state, and at the same time, the two merging frames 303 are merged. The outer wall of the main pump motor abuts against the inside of the stable groove between the two merging frames 303, so as to stabilize the main pump motor lifted onto the maintenance platform, so that the main pump motor is always in a vertical state with the original position. After the main pump motor is overhauled, the main pump motor can be vertically lowered to avoid a large deviation between the main pump motor and the original installation position when the main pump motor is reset after the overhaul is completed.

[0042] Example 2, please refer to Figures 1 - 8As shown, during use, when the two merging frames 303 are merging, they will drive the connecting screw rod sleeve frame 301 to move synchronously inside the connecting frame 102. During the movement of the connecting screw rod sleeve frame 301, it will drive the rotating gear screw rod 302 to rotate. Since the thread pitch of the rotating gear screw rod 302 is half of the thread pitch of the fixed screw rod 502, the rotation speed of the rotating gear screw rod 302 can be increased. The gear on the rotating gear screw rod 302 meshes with the gear on the gear screw rod sleeve frame 501, driving the gear screw rod sleeve frame 501 to rotate synchronously inside the extension frame 103. Since the thread pitch of the fixed screw rod 502 is greater than that of the rotating gear screw rod 302, the moving distance of the fixed screw rod 502 is twice the moving distance of the merging frame 303. Thus, after the two merging frames 303 are merged, the two closing frames 503 can move to the bottom of the stable groove where the two merging frames 303 are docked, thereby closing the bottom of the main pump motor;

[0043] During the merging process of the two closing frames 503, when the two sets of extrusion abutment frames 508 come into contact, the fitting semi-circular blocks 507 that cause the top of the closing frame 503 to contract are located at the edge of the stable groove. Since the size of the fitting semi-circular blocks 507 is smaller than the size of the stable groove on the merging frame 303, when the two sets of extrusion abutment frames 508 continue to abut against each other, they squeeze the inclined surfaces of the inclined blocks 506 on both sides, thereby driving the inclined blocks 506 to slide upward inside the through holes 505, causing the fitting semi-circular blocks 507 to move out of the top of the closing frame 503 and into the merging frame 303. When the two merging frames 303 and the closing frames 503 are spliced, the tops of the fitting semi-circular blocks 507 on the tops of the two closing frames 503 abut against the bottom of the main pump motor, thereby supporting the main pump motor. When the positioning abutment groove frame 309 rises to the topmost position, the thrust hydraulic cylinder 403 will release force. Due to the elastic force of the compression spring 405, the two sets of limit support plates 402 enter between the positioning abutment groove frame 309 and the stable extension frame 105 to position the positioning of the positioning abutment groove frame 309 and the stable extension frame 105, preventing the positioning abutment groove frame 309 from descending and affecting the maintenance of the main pump motor.

[0044] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art in the relevant technical field can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. An integrated lifting and maintenance platform for a nuclear power main pump motor, comprising a main body (1) and two connecting frames (102). Both of the two connecting frames (102) are fixedly connected to the outer wall of the main body (1). A connecting and positioning frame (104) is fixedly connected to the top of each of the two connecting frames (102). A stable extension frame (105) is fixedly connected to the top of the two connecting and positioning frames (104), characterized in that, It further includes: A hoisting mechanism (2), the hoisting mechanism (2) is arranged on the top of the main body (1), the hoisting mechanism (2) includes a hydraulic lifting column (201), the hydraulic lifting column (201) is fixedly connected to the top of the main body (1), the output end of the hydraulic lifting column (201) is fixedly connected with a telescopic frame (202), a sliding extension column (203) is slidably connected to the side of the telescopic frame (202) away from the hydraulic lifting column (201), a heavy-duty hoist (204) is fixedly connected to the side of the sliding extension column (203) away from the hydraulic lifting column (201), a sliding hole frame (206) is fixedly connected to the side of the heavy-duty hoist (204) away from the sliding extension column (203), a sliding rod (207) is slidably connected inside the sliding hole frame (206), and a limiting top plate (208) is fixedly connected to the bottom of the sliding rod (207); A merging mechanism (3), the merging mechanism (3) is arranged on the outer wall of the stable extension frame (105), the merging mechanism (3) includes a sliding column (307), the sliding column (307) is slidably connected to the top of the stable extension frame (105), a pushing frame (306) is fixedly connected to the bottom of the sliding column (307), merging bars (305) are rotatably connected to both sides of the pushing frame (306), the angle between the two merging bars (305) is greater than sixty degrees, and merging frames (303) are rotatably connected to the ends of the two merging bars (305) away from the pushing frame (306); An extension frame (103) is fixedly connected to the side of the connecting frame (102) away from the retractable frame (101), two fitting grooves are formed in the top of the stable extension frame (105), an installation and fixing structure is arranged at the bottom of the main body (1), and a sliding strip is fixedly connected to the side of the retractable frame (101) away from the main body (1); The hoisting mechanism (2) further includes two extension hydraulic cylinders (205), both of the two extension hydraulic cylinders (205) are fixedly connected to the outer wall of the heavy-duty hoist (204), the output end of the extension hydraulic cylinder (205) is fixedly connected to the outer wall of the telescopic frame (202), a tension spring (209) is fixedly connected between the sliding hole frame (206) and the top of the sliding rod (207), the hoisting cable at the output end of the heavy-duty hoist (204) slidably penetrates through the limiting top plate (208), a connection and fixing structure is arranged at the end of the hoisting cable at the output end of the heavy-duty hoist (204) away from the heavy-duty hoist (204), and the top of the connection and fixing structure abuts against the bottom of the limiting top plate (208), and the top of the sliding rod (207) abuts against the bottom of the pushing frame (306).

2. The integrated hoisting and maintenance platform for the nuclear power main pump motor according to claim 1, characterized in that: The merging mechanism (3) further includes two connecting screw rod sleeve frames (301), the two connecting screw rod sleeve frames (301) are respectively fixedly connected to the sides of the two merging frames (303) away from each other, the connecting screw rod sleeve frames (301) slidably penetrate through the connecting frame (102), a rotating gear screw rod (302) is threadedly connected inside the connecting screw rod sleeve frame (301), and the rotating gear screw rod (302) is rotatably connected to the top of the connecting frame (102).

3. The integrated hoisting and maintenance platform for the nuclear power main pump motor according to claim 2, characterized in that: On one side of the rotating gear screw rod (302) away from the connecting frame (102), a transmission gear is fixedly connected. On the opposite sides of the two merging frames (303), stabilizing grooves are respectively formed. On the sides of the two merging frames (303) away from the retracting frame (101), limiting platform abutting frames (304) are respectively fixedly connected. The merging frames (303) are slidably connected with the sliding strips on the retracting frame (101). On the top of the sliding column (307), a positioning abutting groove frame (309) is fixedly connected. A reset spring (308) is fixedly connected between the positioning abutting groove frame (309) and the stabilizing extension frame (105).

4. The integrated hoisting and maintenance platform for the nuclear power main pump motor according to claim 3, characterized in that: On the top of the stabilizing extension frame (105), a positioning mechanism (4) is provided. The positioning mechanism (4) includes two sliding columns (401). The two sliding columns (401) respectively penetrate through the outer walls of the two connecting positioning frames (104) in a sliding manner. On the sides of the two sliding columns (401) close to the stabilizing extension frame (105), limiting support plates (402) are fixedly connected. The bottoms of the two limiting support plates (402) are abutted against the fitting grooves on the top of the stabilizing extension frame (105).

5. The integrated lifting and maintenance platform for the nuclear power main pump motor according to claim 4, wherein: The tops of the two limiting support plates (402) are abutted against the bottom of the positioning abutting groove frame (309). On the sides of the sliding columns (401) and the limiting support plates (402) away from the stabilizing extension frame (105), two limiting abutting frames (404) are fixedly connected. Compression springs (405) are fixedly connected between the limiting abutting frames (404) between the two limiting support plates (402) and the two sliding columns (401). A thrust hydraulic cylinder (403) is fixedly connected between the two limiting support plates (402).

6. The integrated hoisting and maintenance platform for the nuclear power main pump motor according to claim 5, characterized in that: On the bottom of the merging frame (303), a closing mechanism (5) is provided. The closing mechanism (5) includes a gear screw rod sleeve frame (501). The gear screw rod sleeve frame (501) is rotatably connected in the extension frame (103). On the side of the gear screw rod sleeve frame (501) away from the connecting frame (102), a connecting gear is fixedly connected, and the connecting gear meshes with the transmission gear. Inside the gear screw rod sleeve frame (501), a fixed screw rod (502) is threadedly connected. The thread pitch on the fixed screw rod (502) is twice the thread pitch of the rotating gear screw rod (302). On the side of the fixed screw rod (502) away from the extension frame (103), a closing frame (503) is fixedly connected.

7. The integrated hoisting and maintenance platform for the nuclear power main pump motor according to claim 6, characterized in that: Two retractable chute frames (504) are fixedly connected to the bottom of the enclosure frame (503). A retractable groove is formed at the top of the enclosure frame (503). A through hole (505) is formed through the bottom of the enclosure frame (503). An inclined block (506) is slidably connected inside the through hole (505). A plurality of fitting semi-circular blocks (507) are connected to the top of the inclined block (506). The fitting semi-circular blocks (507) are retracted inside the retractable groove at the top of the enclosure frame (503). An extrusion abutment frame (508) is slidably connected inside the two retractable chute frames (504). A compression spring is fixedly connected between the rear wall of the extrusion abutment frame (508) and the inner wall of the back surface of the retractable chute frame (504). A roller is arranged at a position on the rear wall of the extrusion abutment frame (508) corresponding to the inclined surface of the inclined block (506). The fitting semi-circular blocks (507) are correspondingly used in cooperation with the stable grooves on the merging frame (303). There are two closing mechanisms (5), and the two closing mechanisms (5) are symmetrically distributed with the main body (1) as the center.

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