CN116332064A

CN116332064A - Synchronous hoisting mechanism of special sealing weld maintenance machine

Info

Publication number: CN116332064A
Application number: CN202111602212.3A
Authority: CN
Inventors: 文忠; 俞照辉; 李玮; 闫国华; 樊钊; 周佳琪; 马战龙
Original assignee: State Nuclear Power Plant Service Co Ltd
Current assignee: State Nuclear Power Plant Service Co Ltd
Priority date: 2021-12-24
Filing date: 2021-12-24
Publication date: 2023-06-27

Abstract

The invention provides a synchronous hoisting mechanism of a special sealing weld repairing machine, which comprises a plurality of clamping modules, a hoisting frame and synchronous hoisting modules, wherein the clamping modules are used for being fixed on a scaffold platform, the synchronous hoisting modules are installed on the hoisting frame, the scaffold platform is erected above a control rod driving mechanism to be repaired, the clamping modules comprise support leg fixing seats, the hoisting frame comprises a plurality of support legs and support beams, the number of the support legs is the same as that of the support leg fixing seats, the lower ends of all the support legs are respectively connected with all the support leg fixing seats in a one-to-one correspondence manner, the upper ends of the support legs are connected with the end parts of the support beams, the synchronous hoisting modules comprise a fixed disc installed on the support beams, a plurality of fixed pulley blocks installed on the fixed disc, and a plurality of movable pulley blocks connected with all the fixed pulley blocks through pull ropes, and lifting hooks used for being connected with hoisting ports of the special sealing weld repairing machine are installed on each movable pulley block. The synchronous hoisting mechanism can realize stable hoisting of the special maintenance machine.

Description

Synchronous hoisting mechanism of special sealing weld maintenance machine

Technical Field

The invention relates to the technical field of sealing weld maintenance of a control rod driving mechanism, in particular to a synchronous hoisting mechanism of a special sealing weld maintenance machine.

Background

The Control Rod Driving Mechanism (CRDM) is a servo mechanism of a nuclear power station reactor control and safety protection system and is used for starting and stopping a reactor, adjusting power and stopping the reactor in an accident. A plurality of CRDM are distributed on the top cover of the reactor pressure vessel, and a plurality of sealing weld joints are arranged from bottom to top, so that different reactor types are different. The sealing weld joint plays a sealing role, any leakage is not allowed in the whole life period, but according to the nuclear power operation experience at home and abroad, the occurrence of leakage event of the sealing weld joint is a fault with higher frequency, the safe operation of the nuclear power station is seriously endangered, and the in-service maintenance is needed through a maintenance special machine. The sealing weld repair operation is in a narrow limited operation space, the CRDM is of a vertical long rod type structure, the CRDM is uniformly and densely arranged above the top cover of the pressure vessel, the special machine is difficult to install, a scaffold is usually erected for installing the sealing weld repair special machine at home and abroad, a manual climbing mode to the top cover for manual installation and positioning is adopted, the problems that the accessibility of personnel is poor, the operation space is limited, the irradiation dose is high and the like exist, the existing hoisting ropes are difficult to meet the requirement of sleeving and installing the special machine on the CRDM travel sleeve, the special repair machine is inclined due to the fact that single rope hoisting is easy, the travel sleeve sleeving and installing can be met due to the fact that a plurality of rope hoisting needs to be long, factory building ring hoisting is occupied, and other field construction operations are influenced. In order to improve the current state of the art, the maintenance special machine is ensured to be stably and conveniently installed, and a synchronous hoisting mechanism of the sealing weld maintenance special machine is required to be developed.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a synchronous hoisting mechanism for a sealing weld maintenance special machine, which can realize stable hoisting of the maintenance special machine, reduce the irradiation dose of operators and save maintenance time.

The invention provides a synchronous hoisting mechanism for a special sealing weld repairing machine, which comprises a plurality of clamping modules, a hoisting frame and synchronous hoisting modules, wherein the clamping modules are used for being fixed on a scaffold platform, the synchronous hoisting modules are installed on the hoisting frame, the scaffold platform is erected above a control rod driving mechanism to be repaired, the clamping modules comprise support leg fixing seats, the hoisting frame comprises a plurality of support legs and support beams, the number of the support legs is the same as that of the support leg fixing seats, the lower ends of all the support legs are respectively connected with all the support leg fixing seats in a one-to-one correspondence manner, the upper ends of the support legs are connected with the end parts of the support beams, the synchronous hoisting modules comprise a fixed disc installed on the support beams, a plurality of fixed pulley blocks installed on the fixed disc, and a plurality of movable pulley blocks connected with all the fixed pulley blocks through pull ropes, and hooks used for being connected with hoisting ports of the special sealing weld repairing machine are installed on each movable pulley block.

Further, the synchronous hoisting module further comprises a guide rail fixedly arranged on the supporting beam and a sliding block matched with the guide rail, and the fixed plate is fixedly arranged on the sliding block.

Further, the clamping modules and the supporting legs are 3, the 3 supporting legs are respectively arranged on the supporting leg fixing seats of the 3 clamping modules, the supporting beam comprises a connecting beam and a cross beam, two ends of the cross beam are respectively connected with the end parts of two supporting legs, two ends of the connecting beam are respectively connected with the middle part of the cross beam and the end parts of the other supporting leg, and the guide rail is fixedly arranged on the connecting beam.

Further, the fixed disk side is connected with fixed fixture through the connecting plate, fixed fixture includes two-way screw rod, be provided with the grip block on the two-way screw rod, can drive the grip block through rotatory two-way screw rod and remove until clamping rail.

Further, one end of the pull rope is fixed on the scaffold platform, the other end of the pull rope is wound on a ratchet winch, and the ratchet winch is fixed on the scaffold platform.

Further, the fixed pulley block has 4 groups, the movable pulley block has 3 groups, and 3 groups of movable pulley blocks are distributed along the circumference interval of the fixed disk.

Further, the fixed pulley block comprises a rope guide block, a thread fixing block fixed relative to the rope guide block, an embossing screw rod arranged in the thread fixing block in a threaded fit manner, and a compression block arranged at the end part of the embossing screw rod, wherein the pull rope is arranged between the rope guide block and the thread fixing block in a penetrating manner, and when the embossing screw rod is screwed, the compression block can be pushed to compress the pull rope on the rope guide block.

Further, reticulation is arranged on the contact surface of the compression block and the pull rope.

Further, the clamping module comprises a clamping bottom plate, an upper clamping plate and a lower clamping plate, the lower end of the upper clamping plate is movably connected with the middle of the clamping bottom plate, the upper end of the lower clamping plate is movably connected with the middle of the clamping bottom plate, the upper end and the lower end of the clamping bottom plate are respectively hinged with two slipknot bolts, the two slipknot bolts respectively penetrate through a long waist hole of the upper clamping plate and a long waist hole of the lower clamping plate, and cattle horn nuts are respectively arranged on the two slipknot bolts.

Further, the upper end of the clamping bottom plate is provided with a step structure, and the supporting leg fixing seat is fixedly arranged on the step structure of the clamping bottom plate through an upper quick-release pin.

As described above, the synchronous hoisting mechanism of the special sealing weld maintenance machine has the following beneficial effects:

the whole set of synchronous hoisting mechanism adopts a modularized design, is of a frame structure, is convenient to install on site and is simple to operate; synchronous lifting of a plurality of lifting points is achieved through the pull ropes matched with the movable pulley block and the fixed pulley block, stable and reliable lifting installation of the special maintenance machine can be achieved, manual climbing operation is replaced, irradiation dose of operators can be effectively reduced, maintenance time is saved, and further operation efficiency of the nuclear power station is improved.

In addition, the span of each connecting module of the synchronous hoisting mechanism is adjustable, the clamping size range of the clamping module is large, the installation position can be adjusted through the movement of the guide rail, the synchronous hoisting requirements of different types of special maintenance machines and different pile-type maintenance operation sites can be completed, and the synchronous hoisting mechanism can be popularized and applied to similar synchronous hoisting requirements in other industries; and through setting up a plurality of self-locking structures that compress tightly, further improve the steady, reliable hoist and mount installation to the maintenance special plane.

Drawings

Fig. 1 is a schematic structural diagram of a synchronous hoisting mechanism of a special sealing weld maintenance machine in an embodiment of the invention.

Fig. 2 is a schematic structural diagram of a clamping module according to an embodiment of the invention.

Fig. 3 is an assembly schematic diagram of the fixed pulley block, the fixed disc and the guide rail in the embodiment of the invention.

Fig. 4 is a schematic diagram of a connection structure among a fixed pulley block, a kevlar rope and a movable pulley block in the embodiment of the invention.

Fig. 5 is a schematic structural diagram of a fixed pulley block in an embodiment of the invention.

Fig. 6 is a schematic diagram of a working state of a synchronous hoisting mechanism of a special sealing weld repair machine in an embodiment of the invention.

Description of element reference numerals

1-a clamping module; 101-clamping a bottom plate; 102-a lower quick release pin; 103-a slipknot bolt; 104-a lower clamping plate; 105-flat-head cylindrical pins; 106-upper clamping plate; 107-upper quick release pin; 108-supporting leg fixing seats;

2-hoisting frames; 201-supporting legs; 202-connecting beams; 203-a cross beam; 204-end stops; 205-diagonal bracing; 206-connecting blocks;

3-a synchronous hoisting module; 301-fixed pulley blocks; 302, a guide rail; 303-a slider; 304-lifting lugs; 305-a fixed disk; 306-connecting plates; 307-a fixed clamping mechanism; 308-lifting hook; 309-movable pulley block; 310-Kevlar rope; 311-side connection plates; 312-small pulleys; 313-small spindle; 314-large pulley; 315-large spindle; 316-side reinforcement plate; 317-a transfer block; 318-threaded pin; 319-U-shaped hanging ring; 320-compacting blocks; 321-a threaded fixing block; 322-embossing screw; 323 rope guide block; 324-pressing the supporting plate; 325-pressing the quick release pin;

4, a special maintenance machine; 5-scaffold platforms; 6-ratchet winch; 7-stroke sleeve; 8-sealing the weld; 9-a control rod drive mechanism; 10-reactor pressure vessel header.

Detailed Description

Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.

It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or adjustments of the sizes, which are otherwise, used in the practice of the invention, are included in the spirit and scope of the invention which is otherwise, without departing from the spirit or scope thereof. Also, the terms "upper", "lower", "left", "right", "middle" and "a" are used herein for descriptive purposes only and are not intended to limit the scope of the invention for which the invention may be practiced, but rather the relative relationships thereof may be altered or modified without materially altering the technology.

As shown in fig. 1 to 6, the present embodiment provides a synchronous hoisting mechanism of a special sealing weld repair machine, which includes:

the clamping module 1 comprises a clamping bottom plate 101, a lower quick-release pin 102, a slipknot bolt 103, a lower clamping plate 104, a flat-head cylindrical pin 105, an upper clamping plate 106 and a supporting leg fixing seat 108. The clamping module 1 is a fixed module of the whole synchronous hoisting mechanism, is fixedly clamped on a round pipe or a square pipe of the scaffold platform 5, and works together by a plurality of clamping modules 1; the main body of the clamping module 1 is a clamping bottom plate 101, the clamping bottom plate 101 is sequentially provided with three lug structures from bottom to top, a slipknot bolt 103 is fixedly arranged in the upper lug structure and the lower lug structure through a lower quick-release pin 102, and after the slipknot bolt 103 is matched, the slipknot bolt 103 can freely rotate; the inside of the middle lug structure is respectively connected with the upper end of the lower clamping plate 104 and the lower end of the upper clamping plate 106 through a flat-head cylindrical pin 105, a long waist hole is formed in the middle of the upper clamping plate and the lower clamping plate, a slipknot bolt 103 penetrates through the middle lug structure and is limited by a ox horn nut, and the lower clamping plate 104 and the upper clamping plate 106 can rotate; the upper part of the clamping bottom plate 101 is provided with a step structure, forms a matched support with the supporting leg fixing seat 108, and is locked by an upper quick-release pin 107; the clamping module 1 clamps 2 scaffold steel pipes through the upper and lower clamping plates and is locked and fixed through the ox horn nuts on the slipknot bolts 103.

The hoisting frame 2 comprises supporting legs 201, connecting beams 202, cross beams 203, end stop blocks 204, diagonal braces 205 and connecting blocks 206. The whole lifting frame 2 is of a frame structure and is a support of the whole synchronous lifting mechanism. The lower part of the lifting frame 2 consists of three supporting legs 201, and the supporting legs 201 are respectively arranged in the supporting leg fixing seats 108 and are fixedly connected through screws; the top of the supporting leg 201 is provided with a connecting beam 202 and a cross beam 203, and each lap joint is fixed by a connecting block 206 through a screw; the connection beam 202 and the one-side leg 201 are reinforced by a diagonal brace 205.

The synchronous hoisting module 3, the synchronous hoisting module 3 is composed of a fixed pulley block 301, a guide rail 302, a sliding block 303, a lifting lug 304, a fixed disc 305, a connecting plate 306, a fixed clamping mechanism 307, a lifting hook 308, a movable pulley block 309, a Kevlar pull rope 310, a side connecting plate 311, a small pulley 312, a small rotating shaft 313, a large pulley 314, a large rotating shaft 315, a side reinforcing plate 316, an adapter block 317, a threaded pin 318, a U-shaped lifting ring 319, a compression block 320, a threaded fixed block 321, an embossing screw 322, a rope guide block 323, a compression supporting plate 324 and a compression quick-release pin 325. In this embodiment, a kevlar rope 310 is specifically used as the rope. The synchronous hoisting module 3 is fixedly arranged below the connecting beam 202 of the hoisting frame 2 through a guide rail 302, and is fixedly connected through screws, a plurality of matched sliding blocks 303 are arranged on the guide rail 302, end stop blocks 204 are arranged at two ends of the guide rail 302, and the sliding blocks 303 are prevented from falling off; a fixed disc 305 is fixedly arranged at the lower part of the sliding block 303, the right side of the fixed disc 305 is connected with a fixed clamping mechanism 307 through a connecting plate 306, the fixed clamping mechanism 307 is provided with a bidirectional screw rod, the screw rod is provided with a clamping block, and the clamping block can be clamped on the side surface of the guide rail 302 by rotating the screw rod so as to fix the position of the hoisting module on the guide rail 302; the fixed disk 305 can drive other components to slide on the guide rail 302; 3 lifting lugs 304 are uniformly distributed below the fixed disc 305, wherein 1 fixed pulley block 301,1 are respectively hung below the 2

lifting lugs

304, and 2 fixed pulley blocks 301 are hung below the 2 lifting lugs 304; in the embodiment, the fixed pulley block 301 is of a double-pulley structure, two side connecting plates 311 on the side face are supported by the whole fixed pulley block 301, the lower part of the fixed pulley block 301 is fixedly connected with a small pulley 312 through a small rotating shaft 313, the middle of the fixed pulley block 301 is fixedly connected with a large pulley 314 through a large rotating shaft 315, and rotating bearings are arranged in the pulleys and can rotate freely; the upper parts are fixedly connected together through a connecting block 317, the connecting block 317 is connected with a U-shaped hanging ring 319 through a threaded pin 318, and the fixed pulley block 301 can be hung below the lifting lug 304 through the U-shaped hanging ring 319; a side reinforcing plate 316 is arranged on the outer side of the side connecting plate 311, so that rigidity and stability of the whole pulley block are improved; the outer side of the side reinforcing plate 316 is provided with a compression supporting plate 324, one end of the compression supporting plate can rotate along the large rotating shaft 315, the other end of the compression supporting plate is connected with a threaded fixing block 321 through a rope guide block 323, an embossing screw 322 is installed inside the threaded fixing block 321 through threaded fit, the end part of the embossing screw 322 is provided with a compression block 320 in a matched mode, when the embossing screw 322 is screwed, the compression block 320 can linearly move inwards and can compress a Kevlar pull rope 310 penetrating between the rope guide block 323 and the threaded fixing block 321, the embossing screw 322 is of self-locking design, and a reticulation is arranged on the contact surface of the compression block 320 and the Kevlar pull rope 310 so as to prevent the Kevlar pull rope 310 from being separated; the compressing support plate 324 is provided with a plurality of fixing holes, the compressing quick-release pins 325 can be fixed on the side connecting plates 311, and the rotating angle of the compressing support plate 324 can be adjusted to adapt to the tightening angles of the Kevlar ropes 310 under different working conditions. In the embodiment, a kevlar rope 310 is threaded inside the fixed pulley block 301, the kevlar rope 310 is also threaded inside the 3 movable pulley blocks 309, one rope is threaded through the 3 movable pulley blocks 309 and the 4 fixed pulley blocks 301, two ends of the kevlar rope 310 are respectively threaded on the large pulleys 314 of the fixed pulley blocks 301 and between the rope guide block 323 and the thread fixing block 321, and can be tightly screwed and pressed through the embossing screw 322, and two ends of the kevlar rope 310 are fastened on a scaffold; a lifting hook 308 is arranged below the movable pulley block 309 and used for connecting a lifting opening of the special maintenance machine; when one end of the Kevlar rope 310 is fixed, the other end is controlled to be manually loosened or tightened, and 3 lifting hooks 308 below the movable pulley block 309 can be simultaneously lowered and lifted, so that the maintenance special machine is driven to stably hoist.

The following describes the specific implementation process of the synchronous hoisting mechanism of the special sealing weld maintenance machine with reference to fig. 1 to 6:

when the special sealing weld repairing machine 4 repairs the sealing weld 8 of a certain pile-shaped control rod driving mechanism 9, as shown in fig. 6, hoisting the top cover 10 of the reactor pressure vessel to a storage area, dismantling peripheral components of the control rod driving mechanism 9, erecting a scaffold platform 5 above the control rod driving mechanism 9 to be repaired, taking the sealing weld 8 of a certain pile-shaped middle part as an example, and implementing the synchronous hoisting mechanism in the following steps:

the leakage of a certain pile of middle sealing weld joints 8 is found by nondestructive testing, and maintenance operation is needed; hoisting and placing the special maintenance machine 4 on the scaffold platform 5; installing a synchronous hoisting mechanism: firstly, installing 3 clamping modules 1 on a scaffold fence steel pipe, and clamping and locking; the assembled hoisting frame 2 and the synchronous hoisting module 3 are arranged in the supporting leg fixing seat 108 of the clamping module 1 through supporting legs 201 and locked through quick screws; one end of a Kevlar stay 310 is tightly locked through a rope guide block 323 and a thread fixing block 321, the other end of the Kevlar stay is wound on a hand-operated ratchet winch 6, the ratchet winch 6 is fixed on a railing steel pipe of a scaffold platform 5, the Kevlar stay 310 on the ratchet winch 6 is loosened, 3 movable pulley blocks 309 are lowered to a proper height, and a lifting hook 308 below the movable pulley blocks 309 is connected to a lifting lug above a special maintenance machine 4; the Kevlar stay 310 is slowly tensioned through the ratchet winch 6, the maintenance special machine 4 is stably hoisted to a proper height, and the Kevlar stay 310 at the side of the ratchet winch 6 is locked through the rope guide block 323 and the thread fixing block 321; checking that the fixed clamping mechanism 307 is in a loosening state, paying off ropes, pushing the fixed disc 305 and the special maintenance machine 4 out of the scaffold platform 5, and connecting the hoisting frame 2 with the cantilever area of the beam 202, namely, the area to be maintained; locking the fixed disk 305 by a fixed clamping mechanism 307; the side Kevlar rope 310 of the ratchet winch 6 is unlocked through the rope guide block 323 and the thread fixing block 321, the Kevlar rope 310 is loosened through the ratchet winch 6, the special maintenance machine 4 is slowly and stably lowered, the special maintenance machine is positioned above the travel sleeve 7 of the control rod driving mechanism 9 in an auxiliary mode through a long handle tool, the special maintenance machine 4 to be maintained is sleeved on the outer wall of the travel sleeve 7, the special maintenance machine 4 is continuously lowered to the sealing weld joint 8, and the Kevlar rope 310 is locked; the special maintenance machine 4 performs maintenance operation, and after the maintenance operation is completed, the Kevlar rope 310 is loosened, and the Kevlar rope 310 is tensioned through the ratchet winch 6, so that the special maintenance machine 4 is stably lifted to an upper position; locking the Kevlar stay 310, pushing the fixing disc 305 and the maintenance special machine 4 to the scaffold platform 5 area, and lowering the maintenance special machine 4 to complete the whole hoisting operation process.

In summary, the present invention effectively overcomes the disadvantages of the prior art and has high industrial utility value.

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims

1. The utility model provides a synchronous hoisting mechanism of special plane of sealed weld repair, its characterized in that includes a plurality of clamping module, hoist frame that are used for fixing on scaffold frame platform and installs the synchronous hoisting module on hoist frame, scaffold frame platform is set up in the top of the control rod actuating mechanism of waiting to maintain, clamping module includes the landing leg fixing base, hoist frame includes a plurality of landing legs and supporting beam, the quantity of landing leg is the same with the quantity of landing leg fixing base, and the whole lower extreme of landing leg is connected with whole landing leg fixing base one-to-one respectively, the upper end of landing leg is connected with the tip of supporting beam, synchronous hoisting module includes fixed disk, multiunit fixed pulley group and the multiunit fixed pulley group of installing on the fixed disk and the movable pulley group that all fixed pulley group is connected through the stay cord, every group install the lifting hook that is used for being connected with the hoist port of sealed weld repair special plane on the movable pulley group.

2. The synchronous hoisting mechanism of the special sealing weld repairing machine according to claim 1, wherein the synchronous hoisting module further comprises a guide rail fixedly installed on the supporting beam and a sliding block matched with the guide rail, and the fixed disc is fixedly installed on the sliding block.

3. The synchronous hoisting mechanism of the special sealing weld repairing machine according to claim 2, wherein the number of the clamping modules and the number of the supporting legs are 3, the 3 supporting legs are respectively arranged on the supporting leg fixing seats of the 3 clamping modules, the supporting beam comprises a connecting beam and a cross beam, two ends of the cross beam are respectively connected with the end parts of two supporting legs, two ends of the connecting beam are respectively connected with the middle part of the cross beam and the end parts of the other supporting leg, and the guide rail is fixedly arranged on the connecting beam.

4. The synchronous hoisting mechanism of the special sealing weld repairing machine according to claim 2, wherein the side edge of the fixed disc is connected with the fixed clamping mechanism through a connecting plate, the fixed clamping mechanism comprises a bidirectional screw, a clamping block is arranged on the bidirectional screw, and the clamping block can be driven to move until the guide rail is clamped by rotating the bidirectional screw.

5. The synchronous hoisting mechanism of the special sealing weld repair machine according to claim 1, wherein one end of the pull rope is fixed on a scaffold platform, the other end of the pull rope is wound on a ratchet winch, and the ratchet winch is fixed on the scaffold platform.

6. The synchronous hoisting mechanism of the special sealing weld repair machine according to claim 1, wherein the fixed pulley blocks are 4 groups, the movable pulley blocks are 3 groups, and the 3 groups of movable pulley blocks are distributed at intervals along the circumferential direction of the fixed disc.

7. The synchronous hoisting mechanism of the special sealing weld repairing machine according to claim 1, wherein the fixed pulley block comprises a rope guide block, a threaded fixing block relatively fixed with the rope guide block, an embossing screw rod arranged in the threaded fixing block in a threaded fit manner, and a compression block arranged at the end part of the embossing screw rod, wherein the pull rope is arranged between the rope guide block and the threaded fixing block in a penetrating manner, and when the embossing screw rod is screwed, the compression block can be pushed to compress the pull rope on the rope guide block.

8. The synchronous hoisting mechanism for the special sealing weld repair machine according to claim 7, wherein a reticulation is arranged on the contact surface of the compaction block and the pull rope.

9. The synchronous hoisting mechanism of the special sealing weld repairing machine according to claim 1, wherein the clamping module comprises a clamping bottom plate, an upper clamping plate and a lower clamping plate, the lower end of the upper clamping plate is movably connected with the middle part of the clamping bottom plate, the upper end of the lower clamping plate is movably connected with the middle part of the clamping bottom plate, the upper end and the lower end of the clamping bottom plate are respectively hinged with two slipknot bolts, the two slipknot bolts respectively penetrate through a long waist hole of the upper clamping plate and a long waist hole of the lower clamping plate, and cattle horn nuts are respectively arranged on the two slipknot bolts.

10. The synchronous hoisting mechanism of the special sealing weld repairing machine according to claim 9, wherein a step structure is arranged at the upper end of the clamping bottom plate, and the supporting leg fixing seat is fixedly arranged on the step structure of the clamping bottom plate through an upper quick-release pin.