CN111963486A - Large-scale shielding main pump integral dismounting device and dismounting process in radioactive environment - Google Patents

Large-scale shielding main pump integral dismounting device and dismounting process in radioactive environment Download PDF

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Publication number
CN111963486A
CN111963486A CN202010518980.XA CN202010518980A CN111963486A CN 111963486 A CN111963486 A CN 111963486A CN 202010518980 A CN202010518980 A CN 202010518980A CN 111963486 A CN111963486 A CN 111963486A
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CN
China
Prior art keywords
shielding
main pump
main
pump
bolt
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Pending
Application number
CN202010518980.XA
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Chinese (zh)
Inventor
李涛
董宝泽
李松
王斌元
廖长城
王信东
耿加森
曹阳
郦元辉
王扬
王超
林鑫辉
杨志业
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Sanmen Nuclear Power Co Ltd
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Sanmen Nuclear Power Co Ltd
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Application filed by Sanmen Nuclear Power Co Ltd filed Critical Sanmen Nuclear Power Co Ltd
Priority to CN202010518980.XA priority Critical patent/CN111963486A/en
Publication of CN111963486A publication Critical patent/CN111963486A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/628—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B45/00—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B45/00—Hand-held or like portable drilling machines, e.g. drill guns; Equipment therefor
    • B23B45/003—Attachments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/028—Angle tools

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

A device and a process for integrally disassembling a large-scale shielding main pump in a radioactive environment belong to the technical field of maintenance of the large-scale shielding main pump of a nuclear power station. The invention comprises a main bolt pneumatic dismounting tool, an upper C-shaped ring residual liquid dredging tool, an upper C-shaped ring cutting tool, a pump shell shielding protection tool, an impeller shielding and rotor locking tool. The method is simple to operate, and can safely and efficiently finish the disassembly of the large shielding main pump.

Description

Large-scale shielding main pump integral dismounting device and dismounting process in radioactive environment
Technical Field
The invention relates to the technical field of maintenance of large-scale shielding main pumps of nuclear power stations, in particular to an integral dismounting device and a dismounting process of a large-scale shielding main pump in a radioactive environment.
Background
After a nuclear power station runs for a long time, the thrust bearing, the shielding sleeve, the lower locking cup and other parts of a shielding reactor coolant pump (hereinafter referred to as a shielding main pump) have the possibility of generating problems, and it is necessary to plan and develop the integral dismounting process of the shielding main pump in a radioactive environment in advance. The pump shell of the shielding main pump is welded on the bottom head of the steam generator and is inversely arranged on the pump shell through 24 main bolts. The arrangement of the surrounding space of the shielding main pump is compact and narrow, the shielding main pump cannot be annularly hung at the position of the shielding main pump, and the integral dismounting process of the large shielding main pump in the radioactive environment is complex. Through the comprehensive analysis of the evaporator compartment field condition, the connection mode of the shielding main pump and the pump shell and the overall dismounting process of the shielding main pump, the factors restricting the overall dismounting of the shielding main pump are mainly as follows:
the hoisting difficulty of the main bolt of the shielding main pump is large: the shielding main pump is integrally disassembled, and repeated disassembly and assembly of the main bolt are involved. The westinghouse design shielding main pump main bolt hoisting process is based on the prerequisite that a main pump mounting trolley is in place, but the main pump mounting trolley can be hoisted to a steam generator cavity only after a large amount of materials in an evaporator compartment are dismantled, so that the main pump overhauling key path is restricted by the hoisting work of the main bolt, the key path time is greatly increased, and the total radiation dose of maintenance personnel is improved. In order to optimize the main bolt hoisting process, a special tool for hoisting the main bolt needs to be developed under the condition that the trolley is not installed by a main pump.
The shielding main pump main bolt dismounting tool and the process need to be improved: the shielding main pump is integrally disassembled, and repeated disassembly and assembly of the main bolt are involved. Through the comprehensive analysis of the evaporator compartment field condition, the connection mode of the shielding main pump and the pump shell and the dismounting and mounting process of the main bolt of the shielding main pump, the factors restricting the dismounting and mounting of the main bolt of the shielding main pump are mainly as follows: (1) the west house design shielding main pump main bolt dismantling process is based on the prerequisite that a main pump mounting trolley is in place, but the main pump mounting trolley can be lifted to a steam generator chamber after a large amount of materials in an evaporator compartment are dismantled, so that the dismantling and assembling work of the main bolt restricts a main pump overhaul critical path, the time of the critical path is greatly increased, and the total radiation dose of maintenance personnel is improved; (2) the main bolt dismounting work is related to the inspection and adjustment of the extension amount of the main bolt of the shielding main pump for multiple times in the service life, but the main bolt is dismounted by means of a shielding main pump mounting trolley, and a large amount of materials in an evaporator compartment need to be dismounted; (3) the main bolt dismounting work needs that an maintainer uses the main bolt dismounting tool in a matching way by means of a socket wrench, and the main bolt is inversely arranged, so that the main bolt is in a tipping risk in the moment of falling of the main bolt. The main bolt is large in overall dimension, heavy in weight, difficult to carry manually and not suitable for operation by maintainers, so that the main bolt is difficult to disassemble and assemble. In order to optimize the main bolt dismounting process, the invention provides the special tool and the process for pneumatically controlling the dismounting of the main bolt, which realize the dismounting of the main bolt without depending on the main pump to mount a trolley.
The radioactive residual liquid in the C-shaped sealing ring at the upper part of the shielding main pump is difficult to drain: the shielded main pump upper C-seal is an annular part welded between the main pump housing and the removable main pump assembly, with an inner diameter of 1599.18mm, which is the pressure boundary of the shielded main pump. The cross section is C-shaped, the two ends are thicker and 11.17mm, the middle part is thinner and 6.35mm, the total height is 85.09mm, and the material is ASME SA-182F 304N. In the whole process of dismantling of shielding main pump, at first need will dismantle shielding main pump subassembly and remove from the pump case, then upper portion C type sealing ring must cut, but because shielding main pump's structural feature, shielding main pump's inside medium dredges the back through lower part trap, cavity region still can have 40L radioactive liquid to exist behind upper portion C type sealing ring, has radioactive raffinate along the kerf splash when cutting upper portion C type sealing ring, causes field work personnel and equipment to stain. Therefore, a special device is needed to be designed for draining the radioactive residual liquid in the upper C-shaped sealing ring. The difficult point that the interior raffinate of upper portion C type seal ring was dredged and is arranged has in combination shielding main pump's structural feature and on-the-spot arrangement condition: the radioactive residual liquid is difficult to collect, the device and the upper C-shaped sealing ring are difficult to seal, the drilling difficulty on the upper C-shaped sealing ring is large, the operation space is narrow, the foreign matter control difficulty and the evacuation progress pressure are large.
The shield main pump upper portion C type seals cutting device and cutting process need to be developed: the shielding main pump is invertedly installed in the evaporimeter bottom, leans on main bolted connection main flange and pump case, realizes that the inversion of shielding main pump is fixed, carries out seal weld by upper portion C type ring, realizes sealed, and upper portion C type ring height 85.09mm, and the axial mid-plane department is thinnest, and thickness 6.35mm, and in the whole process of dismantling of whole shielding main pump, it is first process to cut C type sealing ring. Therefore, it is necessary to design a cutting tool for the upper C-ring when the canned main pump is placed upside down in the pump housing by the remaining symmetrically arranged 4 main bolts. In designing the upper C-ring cutting tool, installability of equipment, controllability of operation, convenience of operation of an operator, and integrity of the entire cutting process need to be considered. Through the comprehensive analysis to the on-site operating mode, shielding main pump structure and the whole dismantlement technology of shielding main pump, upper portion C type ring cutting tool should possess following characteristic: (1) the space at the upper C-shaped ring of the shielding main pump is limited, and the circumferential feeding of a cutting tool is required to be considered when the upper C-shaped ring cutting tool is designed, and the upper C-shaped ring cutting tool has certain precision; (2) in order to avoid unnecessary damage to a heat shield and prevent scrap iron generated during cutting from entering the interior of a pump shell when the upper C-shaped ring is cut, a limiting device for radial feeding is designed for an upper C-shaped ring cutting tool, so that the control of the feeding amount is realized; (3) because of pump chamber space is limited, upper portion C type ring cutting means should possess certain collection ability to the iron fillings when carrying out the cutting of upper portion C type ring, avoids the iron fillings that produce to become the pollution to the pump chamber.
The shield main pump case prevents foreign matter and interim shield assembly and needs to develop: the shielding main pump is inversely arranged at the bottom of the evaporator, and when the damaged main pump is integrally detached from the pump shell, the bottom of the pump shell is opened, so that the environmental dosage is very high; the shielding main pump and the shielding main pump mounting trolley move to a lifting opening, the main lifting appliance and the hook for mounting the shielding main pump and the shielding pump mounting trolley rotate for 24 hours, the risk that workers in the pump cavity are irradiated is greatly increased, and the risk that foreign matters enter the main loop system is increased. After the shielding main pump moves out of the position under the pump shell, the opening of the pump shell is necessary to be effectively and temporarily blocked on the premise that the shielding equipment of the pump shell cannot smoothly enter the site. Therefore, need for one kind can install fast under high radioactivity environment, foreign matter and interim shield assembly are prevented to easy operation and effectual shielding main pump case, through the pump case bolt hole, machine tooling dysmorphism bolt, realize interim pump case and prevent foreign matter and interim shield assembly's fixed, use instrument such as rope, realize that the pump case prevents foreign matter and interim shield assembly's quick installation, move hoist and mount mouth for follow-up shielding main pump together with shielding main pump installation dolly, the basis is established together with work such as shielding main pump installation dolly rotation to shielding main pump couple and shielding dress pump, reach the purpose of preventing the foreign matter simultaneously.
The device for shielding the impeller of the main pump and locking the rotor needs to be developed: the shielding main pump is inversely arranged at the bottom of the evaporator, when the damaged shielding main pump is integrally detached from the pump shell, hydraulic parts such as a pump impeller and the like are directly exposed in the environment, the environmental dosage is very high, and the subsequent maintenance work such as hoisting, overturning, transferring and the like of the shielding main pump is seriously influenced; in addition, in the processes of hoisting, overturning and transporting of the shielding main pump, in order to prevent the rotor from moving and damaging components such as a thrust bearing assembly and the like, a rotor assembly of the shielding main pump needs to be locked before the main pump is overturned; therefore, effective shielding of the pump impeller portion and locking of the rotor assembly is necessary. Through the comprehensive analysis of the site working condition, the shielding main pump structure and the shielding main pump integral disassembly process, the factors restricting in the prior art are as follows: (1) the space of a cavity of the shielding main pump is limited, the pump needs to fall, and locking of a rotor assembly of the shielding main pump and installation of an impeller shielding device are realized after the pump moves to a hoisting port; (2) the shielded main pump lifting channel is narrow in space, a rotor locking device, an impeller shielding case and a main lifting appliance need to be integrally installed, the installation of the main lifting appliance cannot be interfered after the rotor locking device and the impeller shielding case are installed, and the overall dimensions of the rotor locking device and the impeller shielding case cannot exceed the overall dimensions of the main lifting appliance; (3) the impeller of the shielding main pump is directly connected with a loop, and the dosage of radioactive environment is high; (4) the shielding main pump impeller has residual radioactive medium, and the leakage risk exists. Therefore, the shielding function of the impeller assembly of the shielding main pump and the locking function of the rotor assembly can be realized, the size of the tool can meet the requirement of the installation of a main lifting appliance, and a foundation is laid for the turning, transportation and disassembly maintenance of the subsequent shielding main pump.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a device and a process for disassembling a large-scale shielding main pump in a radioactive environment, which are simple to operate and can safely and efficiently complete the disassembly of the large-scale shielding main pump.
The purpose of the invention is realized by the following technical scheme:
a large-scale shielding main pump integral dismounting device under radioactive environment comprises a main bolt pneumatic dismounting tool, an upper C-shaped ring residual liquid dredging tool, an upper C-shaped ring cutting tool, a pump shell shielding protection tool, an impeller shielding and rotor locking tool,
the main bolt pneumatic dismounting tool comprises a main bolt hoisting assembly and a main bolt lifting assembly, wherein the main bolt hoisting assembly comprises a lifting lug, a pulley arranged at the lower end of the lifting lug, a universal lifting bolt, a winch and a steel wire rope connected with the universal lifting bolt and the winch through the pulley, and the upper end of the lifting lug is provided with an external thread matched with a threaded hole of a pump shell;
the main bolt lifting assembly comprises a support frame arranged on a main flange, two guide rods arranged below the main flange and connected with the support frame, a cylinder fixing plate arranged at the lower ends of the two guide rods, a sliding connecting plate connected to the two guide rods in a sliding manner, a main bolt rotary joint arranged on the sliding connecting plate, and a cylinder arranged below the cylinder fixing plate, wherein the output end of the cylinder penetrates through the cylinder fixing plate and is connected to the sliding connecting plate;
the tool for dredging and discharging the residual liquid in the upper C-shaped ring comprises a vacuum waste liquid tank, a filter, a vacuum pump and a fixed-distance drill; the distance drill is positioned on the upper C-shaped sealing ring and used for distance drilling; the liquid discharge hole of the distance drill is connected with the vacuum waste liquid tank through a pipeline, and the vacuum waste liquid tank is sequentially connected with the filter and the vacuum pump through pipelines;
the upper C-shaped ring cutting tool comprises a circumferential guide rail, a circumferential sliding block, a radial guide rail, a radial sliding block and an angle grinder; the circumferential guide rail is mounted on the main pump flange through a circumferential support body assembly, so that a gap is reserved between the circumferential guide rail and the main pump flange; the circumferential sliding block is arranged on the circumferential guide rail, so that the circumferential sliding block can slide along the circumferential direction of the circumferential guide rail; the radial guide rail is fixed on the circumferential sliding block, and the radial sliding block is arranged on the radial guide rail so that the radial sliding block can slide along the radial guide rail in the radial direction; the angle grinder is mounted on the radial sliding block;
the pump shell shielding and protecting tool comprises a foreign matter preventing plate and a plurality of foreign matter preventing plate supporting pieces arranged on the foreign matter preventing plate; the foreign matter prevention plate is a splicing structure with a cover plate fully welded on the support ring; the foreign matter prevention plate support is used for installing the foreign matter prevention plate on the pump shell in a sealing way; the cover plate is provided with a pump shell drainage joint;
the impeller shielding and rotor locking tool comprises a cover body, shielding cover supporting legs arranged on the cover body and bolt fasteners arranged at the top of the cover body, wherein flange connecting pieces are arranged at the tail ends of the shielding cover supporting legs.
Preferably, the upper part of the support frame is provided with a positioning plate, and the middle part of one side of the positioning plate is provided with a positioning arc matched with the main flange hole.
Preferably, the cylinder is connected with a cylinder control system which comprises two speed regulating valves, a pneumatic position retaining valve, an emergency stop button silencer, two joints, a shuttle valve and a pneumatic control box; the rodless cavity and the rod cavity of the air cylinder are respectively connected with a speed regulating valve, the two speed regulating valves are connected to a pneumatic position retaining valve, the pneumatic position retaining valve is connected to an emergency stop button, the emergency stop button is connected to a shuttle valve, two ends of the shuttle valve are respectively connected to a pneumatic control box through a connector, and the pneumatic position retaining valve is further connected to the two connectors.
Preferably, the pneumatic control box comprises an air source inlet pipe, a water drop separator, a residual pressure release valve, an air filter, a pressure reducing valve, an air tank, a precise pressure reducing valve, a pressure switch and a manual valve which are connected in sequence, and the water drop separator, the air filter and the air tank are connected with a water collecting tank.
Preferably, the distance drill comprises a drill bit, a drill chuck, a pistol drill and a supporting mechanism; the drill bit penetrates through the drill chuck, the head end of the drill bit is used for abutting against the upper C-shaped sealing ring to drill a hole, and the tail end of the drill bit is connected with the drill chuck of the pistol drill through the fixing ring; the front part of the drill chuck is designed with an intersecting line shape consistent with the upper C-shaped sealing ring, and the drill chuck is provided with a liquid discharge hole communicated with a drill bit passing through a channel; the supporting mechanism is used for supporting between two main bolts of the shielding main pump and applying pressure to the drill chuck, so that the drill chuck can be tightly attached to the upper C-shaped sealing ring.
Preferably, the drill chuck comprises a drill chuck front cover and a drill chuck rear cover; and an irradiation-resistant sealing gasket is arranged between the drill chuck front cover and the drill chuck rear cover and is fastened through screws.
Preferably, the circumferential support body assembly comprises a first circumferential guide rail cushion block, a second circumferential guide rail cushion block, a bottom support block, a screw and a bolt; the first circumferential guide rail cushion block and the second circumferential guide rail cushion block are in over fit with a main pump flange bolt hole, and the first circumferential guide rail cushion block and the second circumferential guide rail cushion block are arranged between a main pump flange and a circumferential guide rail; the bottom supporting block is arranged on the lower portion of the main pump flange and is coaxially arranged with the second circumferential guide rail pad, and the bottom supporting block and the second circumferential guide rail pad are connected through a screw rod passing through a main pump flange bolt hole and are fixed through bolts arranged on the lower portion of the main pump flange.
Preferably, the number of the first circumferential guide rail cushion blocks is three, and the number of the second circumferential guide rail cushion blocks, the bottom support block, the screw and the bolts are two; two ends and the middle part of each circumferential guide rail are respectively installed on the main pump flange through a first circumferential guide rail cushion block, and a second circumferential guide rail cushion block is installed between every two adjacent first circumferential guide rail cushion blocks.
Preferably, the foreign matter prevention plate supporter includes a fixing section, a connecting section, and an assembling section; one end of the fixed section is welded and fixed on the foreign matter prevention plate, and the other end of the fixed section is connected with one end of the connecting section; one end of the assembling section is connected with the other end of the connecting section, and the other end of the assembling section is used for being fixed with the pump shell; the fixed section is relative prevent that the foreign matter board sets up perpendicularly, the linkage segment is relative prevent that foreign matter board parallel arrangement, the assembly segment is L type section, its have the screw hole the segmentation with prevent that the foreign matter board is parallel.
The invention also provides a process for integrally disassembling the large-scale shielding main pump in the radioactive environment, which adopts the device for integrally disassembling the large-scale shielding main pump in the radioactive environment and comprises the following steps:
step 1, removing an external heat exchanger and accessory parts for shielding a main pump;
step 2, disassembling 20 symmetrically arranged main bolts by using the main bolt pneumatic disassembling tool;
step 3, installing the residual liquid drainage tool in the upper C-shaped ring to finish drainage of the radioactive residual liquid in the upper C-shaped sealing ring;
step 4, installing the upper C-shaped ring cutting tool to complete cutting of the upper C-shaped sealing ring of the cuttable area;
step 5, installing 4 main bolts by using the main bolt pneumatic dismounting tool;
step 6, disassembling 4 main bolts with uncut upper C-shaped sealing ring accessories by using the main bolt pneumatic disassembling tool;
step 7, installing the upper C-shaped ring cutting tool to complete the cutting of the upper C-shaped sealing ring in the remaining area;
step 8, mounting a shielding main pump mounting trolley around the shielding main pump to support the weight of the shielding main pump;
step 9, disassembling the remaining 4 main bolts by using the main bolt pneumatic disassembling tool;
step 10, utilizing a shielding main pump to install a trolley, descending and moving out the shielding main pump installation trolley with the shielding main pump according to a preset route;
step 11, installing the pump shell shielding protection tool to play a role in preventing foreign bodies and shielding;
step 12, mounting the impeller shield and rotor locking tool to the impeller;
and step 13, installing a main lifting appliance and a lifting facility for lifting the shielding main pump, lifting the shielding main pump out of the shielding main pump compartment, and finishing the integral disassembly work of the shielding main pump.
The invention has the advantages that:
1. can realize shielding main pump kingbolt hoist and mount's function under the condition that does not rely on shielding main pump installation dolly, save the dismouting time of bulk material dismouting and main pump installation dolly on the main pump cavity hoist and mount passageway, shorten main pump hoist and mount critical path time, reduce maintenance personal radiation total dose.
2. The function of disassembling and assembling main bolts of the shielding main pump can be realized before the mounting trolley of the shielding main pump reaches a specified position, the process time of disassembling and assembling a large amount of materials and the mounting trolley of the shielding main pump is saved, the time of overhauling a key path of the main pump is shortened, and the total radiation dose of maintenance personnel is reduced.
3. Can be in the operation of the narrow and small region of main pump upper portion C type sealing ring, realize location and distance drilling on the C type sealing ring to inside the smear metal that prevents the drilling production gets into the main pump, there is reliable sealed between device and the sealed ring of upper portion C type, carry out effectual containing and collection to the radioactive raffinate of outflow, and can aspirate the raffinate in the following region in drilling position, can also adsorb the radioactive gas of outflow.
4. The foreign matter prevention plate can effectively prevent the foreign matter from blocking the opening at the bottom of the pump shell of the main pump; the opening at the bottom of the pump shell of the main pump can be effectively shielded through the lead sheet, so that the environmental dosage of the pump cavity is reduced; the lead sheath supporting piece can be used for effectively supporting the lead sheath; in addition, still implant the pump case through special-shaped bolt assembly, can effectively fix preventing foreign matter apron subassembly, lead skin supporting component.
5. The radioactive shielding of the impeller assembly is realized through the shielding cover and the top cover plate; through the locking Assembly at cover body top realizes the locking of main pump rotor subassembly, lays a good foundation for the hoist and mount and the transportation work of main pump.
Drawings
FIG. 1 is a schematic structural view of a pneumatic main bolt disassembling tool according to the present invention;
FIG. 2 is a schematic structural view of a support frame in the main bolt pneumatic dismounting tool;
FIG. 3 is a schematic structural view of a kingbolt lifting assembly under a support frame;
FIG. 4 is a schematic diagram of the structure of the pneumatic box in the pneumatic main bolt disassembling tool;
FIG. 5 is a schematic structural diagram of a cylinder control system in the main bolt pneumatic dismounting tool;
FIG. 6 is a cross-sectional view of a prior art mid-top C-ring seal;
FIG. 7 is a schematic representation of a prior art radioactive raffinate in the upper C-ring seal;
FIG. 8 is a schematic view of the structure of the tool for draining the residual liquid in the C-shaped ring at the upper part of the present invention;
FIG. 9 is a schematic view of the construction of the distance drill of FIG. 8;
FIG. 10 is a cross-sectional view of the drill chuck of FIG. 9;
FIG. 11 is an assembled view of the distance drill of FIG. 9 mounted on the upper C-ring seal;
FIG. 12 is a schematic view of a supporting mechanism in the upper C-ring inner residue evacuation tool;
FIG. 13 is an enlarged partial view of the upper C-ring cutting tool of the present invention;
FIG. 14 is a cross-sectional view of the upper C-ring cutting tool with the circumferential guide mounted to the main pump flange via the circumferential support assembly;
FIG. 15 is a schematic view of the upper C-ring cutting tool with the circumferential slide mounted on the circumferential guide;
FIG. 16 is a bottom view of the circumferential slide in the upper C-ring cutting tool;
FIG. 17 is an enlarged view of the upper C-ring cutting tool at the radial guide;
FIG. 18 is a schematic structural view of the radial stop block of FIG. 17;
FIG. 19 is a schematic view of the housing mounting of the angle grinder;
FIG. 20 is a schematic view of the mounting arrangement of the pump housing shield guard of the present invention;
FIG. 21 is a schematic view showing the structure of the foreign object prevention plate and the foreign object prevention plate supporter in FIG. 20;
FIG. 22 is a schematic structural view of the mesh structure of FIG. 20;
FIG. 23 is a schematic view of the construction of the profiled bolt assembly in the pump casing shield and shield tool of the present invention;
FIG. 24 is a perspective view of the impeller shield and rotor locking tool of the present invention;
FIG. 25 is a top view of the impeller shield and rotor locking tool of the present invention;
FIG. 26 is a bottom view of the impeller shield and rotor locking tool of the present invention;
FIG. 27 is a perspective view of the impeller shield and rotor locking tool of the present invention shown without the top cover plate;
FIG. 28 is a side cross-sectional view of the shroud of the impeller shield and rotor locking tool of the present invention;
fig. 29 is a schematic view showing an assembly structure of the canned main pump and the accessories.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The utility model provides an integral dismounting device of large-scale shielding main pump under radioactive environment, includes that pneumatic assembly and disassembly tools of king bolt, the interior raffinate of upper portion C type ring dredges row instrument, upper portion C type ring cutting means, pump case shielding protection instrument, impeller shield and rotor locking instrument. Wherein:
as shown in fig. 1-5, the pneumatic main bolt dismounting tool comprises a main bolt hoisting assembly and a main bolt lifting assembly, wherein the main bolt hoisting assembly comprises a lifting lug 111, a pulley 112 arranged at the lower end of the lifting lug 111, a universal lifting eye bolt 113, a winch 114, and a steel wire rope connecting the universal lifting eye bolt 113 and the winch 114 through the pulley 112, and the upper end of the lifting lug 111 is provided with an external thread matched with a threaded hole of the pump shell 14; the main bolt lifting assembly comprises a supporting frame 121 installed on a main flange 13, two guide rods 122 arranged below the main flange 13 and connected with the supporting frame 121, a cylinder fixing plate 123 arranged at the lower ends of the two guide rods 122, a sliding connecting plate 124 connected with the two guide rods 122 in a sliding manner, a main bolt rotary joint 125 arranged on the sliding connecting plate 124, and a cylinder 126 arranged below the cylinder fixing plate 123, wherein the output end of the cylinder 126 penetrates through the cylinder fixing plate 123 and is connected with the sliding connecting plate 124, and the main bolt rotary joint 115 is provided with an inner hexagonal sleeve matched with a main bolt.
Specifically, the support frame 121 is a C-shaped support frame. The C-shaped structure enables the support frame to be stably clamped on the main flange. In addition, a positioning plate 127 is arranged at the upper part of the supporting frame 121, and a positioning arc 128 matched with the main flange hole is arranged at the middle part of one side of the positioning plate 127. The positioning plate and the positioning arc ensure the accuracy of the relative position of the support frame and the main flange hole when the support frame is installed. The lower end of the support frame 121 is provided with a connecting pin 129, and the upper ends of the two guide rods 122 are provided with connecting pieces 1210 matched with the connecting pin 129. The structure is more convenient for the guide bar and the assembly and the support frame between the lower part of the guide bar and the support frame, and simultaneously improves the accuracy of the installation position of the guide bar. The connector 1210 is embodied as an arc-shaped piece to avoid interference with the main flange hole. The lower end of the supporting frame 121 is further provided with a supporting frame jacking assembly 1211. The supporting frame jacking assembly mainly comprises a plurality of jacking bolts for ensuring the connection stability of the supporting frame and the main flange. Further, a universal ball is disposed between the sliding connection plate 124 and the main bolt rotary joint 125. It should be noted that the main bolt rotary joint and the sliding connection plate are in sliding connection and have a certain sliding range, and under the action of the universal balls, the main bolt rotary joint slides more smoothly and flexibly relative to the sliding connection plate, so that the support frame is not required to be installed completely accurately, the main bolt rotary joint can automatically adapt to the position of a threaded hole of a pump shell in a certain range, self-centering is achieved, and the dismounting efficiency of the main bolt is improved. The cylinder 126 is connected with a cylinder control system which comprises two speed regulating valves 151, a pneumatic position retaining valve 152, an emergency stop button 153, an emergency stop button silencer 154, two joints 155, a shuttle valve 156 and a pneumatic control box 157; the rodless cavity and the rod cavity of the air cylinder are respectively connected with a speed regulating valve 151, the two speed regulating valves 151 are connected to a pneumatic position retaining valve 152, the pneumatic position retaining valve 152 is connected to an emergency stop button 153, the emergency stop button 153 is connected to a shuttle valve 156, two ends of the shuttle valve 156 are respectively connected to a pneumatic control box 157 through a joint 155, and the pneumatic position retaining valve 152 is further connected to the two joints 155. The connecting pipe in the control system adopts a hose connection, and the joint adopts a quick connection mode. The connecting pipe between cylinder and the pneumatic control case is longer, and the risk that the connecting pipe drops appears most easily. According to design consideration, the position retaining valve is arranged, so that once the connecting pipe falls off, the position retaining valve can still provide a pressure retaining function, and the main bolt is maintained at the original position. The mechanical self-locking device can fix the sliding connection plate with the main bolt. And through the test of pulling out the connecting pipe, the functional reliability of the pneumatic control system is verified.
The preferable main components in the cylinder control system are selected and have the following functions:
the shuttle valve is VR1210-01, the valve body of the shuttle valve is combined with the actuator, the valve body is equivalent to two check valves which are combined together, the function of the shuttle valve is equivalent to an OR gate, and the shuttle valve is provided with two air inlets and an air outlet. Any one of the two air inlets has signal input, and the air outlet has output. If both the air inlets have signal input, the air signal of the adding side or the high signal pressure side is output through the outlet, and the other side is not communicated.
The emergency stop button is provided with a silencer, and the type of the emergency stop button is VM430-01-30R-X219 and used for emergently stopping the lifting of the air cylinder when unexpected conditions occur in the operation process so as to improve the safety.
The pneumatic position-keeping valve is a valve position protection device, and the model number of the pneumatic position-keeping valve is IL 211-02. The opening pressure was set to 0.10 MPa. When the pressure of the pipeline air source is interrupted or the air source supply system is in failure, the pneumatic position-keeping valve can automatically cut off a channel between the regulator and the air chamber of the regulating valve, so that the valve position of the regulating valve is kept at the original control position, the function of keeping the valve position is achieved, and the process parameters in the regulating loop are guaranteed to be unchanged. After the fault is eliminated, the pneumatic position-keeping valve is immediately restored to the normal position.
When the main bolt is lifted, the factory compressed air coming out of the pneumatic control box sequentially passes through the left side of the shuttle valve, the emergency stop button, the pneumatic position-keeping valve and the speed regulating valve and then enters the rodless cavity of the cylinder, and the cylinder lifts the main bolt; when the main bolt falls, the factory compressed air coming out of the pneumatic control box sequentially passes through the right side of the shuttle valve, the emergency stop button, the pneumatic position-keeping valve and the speed regulating valve and then enters the rod cavity of the cylinder, and the cylinder falls down the main bolt.
The pneumatic control box 157 in the cylinder control system includes an air source inlet pipe 1571, a water droplet separator 1572, a residual pressure release valve 1573, an air filter 1574, a pressure reducing valve 1575, a pressure gauge 1576, an air tank 1577, a precision pressure reducing valve 1578, a pressure switch 1579 and a manual valve 15710 which are connected in sequence, wherein the water droplet separator 1572, the air filters 1574 and 1577 are connected with a water collecting tank 15711. Preferred main components are selected and function as follows:
the residual pressure release valve is of a type VHS30-03AH-BS and is used for releasing the residual pressure of the system;
the pressure reducing valve is AR30-03H-B and is used for reducing the pressure of the factory compressed air to 0.5 MPa;
the air tank is VBAT05A1-U-X104, has the volume of 5L, is used for storing 0.5MPa of compressed air and plays a role in stabilizing pressure for the system;
the precision pressure reducing valve is an IR3020-03H-A type and is used for precisely regulating pressure and reducing the output pressure to 0.28 MPa; can effectively balance king bolt and hoisting device weight, the manual main bolt of rotating of can relaxing among the main bolt dismouting in-process to rotatory main bolt in-process can judge the cooperation condition of main bolt, has not only reduced the influence that the operator strength size brought, still avoids risks such as the jam of main bolt.
And the manual valve is a model VH330-03 and is used for controlling the flow direction of the gas in the gas control box.
The factory compressed air sequentially passes through the water drop separator, the residual pressure release valve, the air filter and the pressure reducing valve, the pressure is reduced to 0.50 MPa, the factory compressed air is stored in the air storage tank, the pressure is reduced to 0.28 MPa through the precision pressure reducing valve, and finally the gas output flow passage is controlled through the manual control valve.
In summary, the use method of the main bolt pneumatic dismounting tool comprises the following steps:
step 1, mounting a main bolt lifting assembly on a main flange 13, and lifting a sliding connecting plate 124 and a main bolt rotary joint 125 through a cylinder 126 until a main bolt 16 is sleeved into an inner hexagonal sleeve of the main bolt rotary joint 125;
step 2, rotating the main bolt rotary joint 125, and meanwhile, slowly dropping the sliding connecting plate 124 and the main bolt rotary joint 125 through the air cylinder 126 until the main bolt 16 is completely screwed out of the threaded hole of the pump shell 14, and leaving enough installation space between the main bolt 16 and the threaded hole of the pump shell 14;
step 3, screwing the lifting lug 111 into a threaded hole of the pump shell 14, screwing the universal lifting eye bolt 113 into a threaded hole of the main bolt 16, and tensioning the steel wire rope through the winch 114 to suspend the main bolt 16;
step 4, enabling the sliding connection plate 124 and the main bolt rotary joint 125 to fall back to the initial position through the air cylinder 126, then closing an air source, and dismantling the main bolt lifting assembly;
step 5, slowly releasing the steel wire rope through the winch 114, and enabling the main bolt 16 to slowly fall until the main bolt 16 falls to the ground or other target positions;
and 6, removing the universal lifting bolt 113, the lifting lug 111 and the winch 114.
As shown in fig. 6 to 12, the means for evacuating the residual liquid in the upper C-ring comprises a vacuum waste liquid tank 22, a filter 23, a vacuum pump 24, and a spacer 21. The distance drill 21 is positioned on the upper C-ring seal for distance drilling. The liquid discharge hole of the distance drill 21 is connected with the vacuum waste liquid tank 22 through a pipeline, and the vacuum waste liquid tank 22 is sequentially connected with the filter 23 and the vacuum pump 24 through pipelines.
The vacuum pump 24 is started to pump the interior of the device into negative pressure, so that liquid can be effectively prevented from leaking at the joint, chips can be sucked into the evacuation device at the moment when the sealing ring is drilled through, the chips are prevented from entering the interior of the main pump, and residual liquid can be sucked out quickly under the action of front-back pressure difference, so that the evacuation efficiency is improved. The filter 23 is used to adsorb the radioactive gas in the device and prevent air pollution in the working area. The vacuum waste liquid tank 22 is used for collecting radioactive residual liquid and cutting scraps, so that subsequent unified treatment is facilitated. The distance drill 21 is positioned and provided with a distance hole on the upper C-shaped sealing ring, and the radioactive residual liquid and the cuttings flowing out are contained and sealed by utilizing the structure of the distance drill, so that the contamination of personnel and equipment is prevented. For the aspect of observing the evacuation condition of raffinate and guaranteeing that the pipeline can not be inhaled and held back, the connecting tube adopts transparent PVC steel wire hose between the equipment. The hose is connected with the joint of each device through a hose clamp, so that the hose is convenient to assemble and disassemble.
The distance drill comprises a drill bit 25, a drill chuck 26, a pistol drill 29 and a support mechanism 27. The drill bit 25 passes through the drill chuck 26, the head end of the drill bit 25 is used for butting against the upper C-shaped sealing ring 210 to drill, and the tail end of the drill bit is used for being connected with a drill rod connected with the pistol drill 29 through the fixing ring 28. The front part of the drill chuck 26 is designed with a shape of an intersecting line consistent with the shape of the upper C-shaped sealing ring, and the drill chuck 26 is provided with a drain hole 261 communicated with a drill bit passing through channel. The support mechanism 27 is used for supporting between two main bolts 220 for shielding the main pump and pressing the drill clamp 26, so that the drill clamp 26 can be tightly attached to the upper C-shaped sealing ring 210. Once the drill bit drills through the C-ring, the radioactive raffinate can drain through the drain hole 261 of the distance drill.
The drill chuck 26 includes a front chuck cover 262 and a rear chuck cover 263. An irradiation-resistant sealing gasket 265 such as an ethylene propylene diene monomer sealing gasket is arranged between the drill chuck front cover 262 and the drill chuck rear cover 263, and sealing is achieved through screw fastening. The front part of the drill chuck 26, namely the drill chuck front cover 262, is provided with a circle of grooves around the open hole, the grooves are internally provided with an irradiation-resistant sealing ring 264, for example, an O-shaped ring made of ethylene propylene diene monomer material is used, the interface diameter of the O-shaped ring is larger, so that enough deformation quantity and sealing area are ensured, and residual liquid cannot leak from the upper C-shaped sealing ring and the lower C-shaped sealing ring when the drill chuck is tightly attached to the upper C-shaped sealing ring. The drill chuck front cover 262 is provided with a first guide hole 2621, the drill chuck rear cover 263 is provided with a second guide hole 2631, the diameters of the first guide hole 2621 and the second guide hole 2631 are both matched with the diameter of a drill bit, the first guide hole 2621 and the second guide hole 2631 are used for guiding the drill bit 25 to pass through the drill chuck 26, and the axes of the first guide hole 2621 and the second guide hole 2631 pass through the middle part of the upper C-shaped sealing ring and are perpendicular to a drilling point tangent plane, so that the middle part of the sealing ring can be drilled without drilling deviation when the drill chuck is tightly attached to the upper C-shaped sealing ring. The back of the drill chuck, i.e., the back cover of the drill chuck, is provided with a skeleton oil seal 2632 for preventing leakage of residual liquid from between the drill chuck 26 and the drill bit 25. The cutting scraps of the stainless steel are not easy to cut off, the coiled coils are wound on the drill rod, in order to prevent blocking the liquid discharge hole 261, a drilling clamp cavity 266 is arranged between the first guide hole and the second guide hole, and the diameter of the cavity is larger than that of the first guide hole or the second guide hole.
The support mechanism 27 is used for applying pressure to the drill chuck 26 by supporting two adjacent main bolts 220 of the drill hole, so that the drill chuck can be tightly attached to the upper C-shaped sealing ring 210. In order to facilitate the disassembly and assembly and have the self-adaptability, the supporting mechanism 27 comprises a first long inclined rod 271, a second long inclined rod 272, a first short inclined rod 273, a second short inclined rod 274, a first supporting claw 275, a second supporting claw 276, a supporting slider 277, a locking handle 278, an eye screw 279 and an optical axis bolt nut 280. The supporting slide block is provided with a guide groove for accommodating the drill chuck rear cover. The two sides of the drill chuck rear cover are retracted inwards relative to the drill chuck front cover, the supporting slide block can move along the radial direction of the drill chuck rear cover under the constraint of the guide groove, and when the drill chuck rear cover moves to the position of the drill chuck front cover, the supporting slide block cannot move forwards under the limitation of the bottom of the drill chuck front cover. One end of the first long inclined rod 271 is connected to the drill chuck 26, the other end is connected to the first supporting claw 275, one end of the first short inclined rod 273 is connected to the supporting slider 277, and the other end is connected to the first supporting claw 275. One end of the second long inclined rod 272 is connected to the drill chuck 26, the other end is connected to the second support claw 276, one end of the second short inclined rod 272 is connected to the support slider 277, and the other end is connected to the second support claw 276. The first support claw 275 and the second support claw 276 are used for being supported on two main bolts respectively. The first long sloped bar 271, the second long sloped bar 272, the first short sloped bar 273, and the second short sloped bar 274 form a symmetrical quadrilateral structure with the support slider 277 as a center. The eye screw 279 is coupled with the drill chuck 26 by the bolt nut 280, and the relative displacement between the locking handle 278 and the eye screw 279 is adjusted by rotating the locking handle 278 mounted to the end of the eye screw, so that the support slider 277 moves in the radial direction.
In order to protect the main bolt 220, the radius of curvature of the grasping surfaces of the first supporting claw 275 and the second supporting claw 276 is consistent with the radius of the cross section circle of the main bolt, and a rubber pad is arranged. Because of the drill chuck and autogenous structure limits, the support slide 277 can only move horizontally in the radial direction. The center of the rotating shaft of the first supporting claw 275 and the first long oblique rod 271 is B, the center of the cross section circle of the main bolt 220 is O, the center of the rotating shaft of the first long oblique rod 271 and the drill chuck 26 is A, the center of the rotating shaft of the first supporting claw 275 and the first short oblique rod 273 is C, the center of the rotating shaft of the first short oblique rod 274 and the supporting slider 277 is D, the passing point C is a perpendicular line of the line segment AD, and the intersection point of the perpendicular line and the line segment AD is E. The length relation of the main bolt on the left side satisfies: the sum of the lengths of the line segment AB and the line segment BO is greater than the length of the line segment AO, and the length of the line segment CD is greater than the length of the line segment CE. Similarly, the center of the rotating shaft of the second supporting claw 276 and the second long diagonal rod 272 is B, the center of the cross section circle of the main bolt 220 is O, the center of the rotating shaft of the second long diagonal rod 272 and the drill chuck 26 is a, the center of the rotating shaft of the second supporting claw 276 and the second short diagonal rod 274 is C, the center of the rotating shaft of the second short diagonal rod 274 and the supporting slider is D, the passing point C is a perpendicular line of the line segment AD, and the intersection point of the perpendicular line and the line segment AD is E; the length relation of the main bolt on the right side meets the following conditions: the sum of the lengths of the line segment AB and the line segment BO is greater than the length of the line segment AO, and the length of the line segment CD is greater than the length of the line segment CE.
The supporting slide block 277 is moved towards the upper C-shaped sealing ring 210, the supporting slide block 277 cannot move, the supporting claws 275 and 276 cannot move, the locking handle 278 is rotated, the eyebolt can rotate around the optical axis bolt, a pretightening force is applied to the supporting slide block 277 by utilizing the relative displacement of the locking handle 278 and the eyebolt 279, the supporting mechanism applies an acting force to the main bolt 220, the main bolt 220 has a reaction force to the supporting mechanism, a certain pressure is applied to a drill chuck, the more the locking handle 278 rotates, the larger the force applied to the drill chuck is, and the tighter the distance drill is clamped between the upper C-shaped sealing ring and two adjacent main bolts. When the support mechanism supports the main bolt, the lifting bolt is in a horizontal position. When the evacuation is finished, the locking handle 278 is rotated in the opposite direction, and the supporting slide block 277 is moved outwards to complete the dismantling of the distance drill. The eye screw 279 is connected to the drill chuck by a spindle bolt nut 280 and can be rotated about the spindle bolt, and when the support mechanism is withdrawn, the eye screw is in a downward inclined position to prevent the locking knob 278 from interfering with the removed support slide 277.
The vacuum waste liquid tank is made of single-layer 2304 stainless steel, and from the radiation protection perspective, collected liquid is discharged to a nearby floor drain as soon as possible after residual liquid in the upper C-shaped sealing ring is drained, so that a drain valve is designed at the lower part of the tank body, universal brake nylon wheels are designed on supporting legs, movement and positioning on the ground are facilitated, handles are symmetrically arranged on two sides of the tank body, and the vacuum waste liquid tank is convenient to carry when going upstairs and downstairs. Still be provided with the glass liquid level window on the jar body, have the liquid level scale mark on the window for observe the volume of collecting liquid and whether because of the liquid boiling condition that the jar internal pressure crossed the cause excessively. In order to effectively prevent residual liquid from being sucked into the air filter, the water pumping port and the air exhaust port are arranged at the top of the tank body, and in addition, isolation valves are arranged on the inlet and outlet pipelines, so that the waste liquid tank is conveniently isolated from the dredging device. The vacuum gauge is arranged at the top of the waste liquid tank, so that the vacuum degree in the tank can be conveniently monitored in real time. For guaranteeing the gas tightness of the waste liquid tank, the tank body is convenient to clean, and the tank cover and the tank body are designed to be connected through a stainless steel vacuum clamp.
The filter is designed to comprise a first steel tank filled with soda lime and a second steel tank filled with activated carbon; the vacuum waste liquid tank is connected with the bottom of the first steel tank through a pipeline, the side wall of the first steel tank is connected with the bottom of the second steel tank through a pipeline, and the side wall of the second steel tank is connected with the vacuum pump through a pipeline. First steel tank and second steel tank adopt 2304 stainless steel jar to utilize 2304 stainless steel frame to erect subaerially, the stainless steel frame is used for fixed steel tank and convenient bulk movement. The tank cover is connected with the tank body through a stainless steel vacuum clamp, so that the air sealing of the tank body can be ensured, and the filling and the replacement of the activated carbon and the soda lime are facilitated. In order to ensure the full contact of the sucked mixed gas with the soda lime and the activated carbon and improve the filtering effect, the process is designed in such a way that the mixed gas firstly enters from the bottom of a steel tank filled with the soda lime, flows out from the side wall, the moisture in the gas is filtered, then enters from the bottom of the steel tank filled with the activated carbon, flows out from the side wall, and the radioactive gas in the gas is filtered.
The vacuum pump is designed to be a jet vacuum pump with small volume, light weight, high reliability and simple maintenance.
In summary, the usage method of the tool for draining the residual liquid in the upper C-shaped ring comprises the following steps:
step 1, erecting a distance drill without a pistol drill between two adjacent main bolts of a shielding main pump, and ensuring that a drill bit of the distance drill is in sealing contact with an upper C-shaped sealing ring;
step 2, sequentially connecting a radioactive residual liquid dredging device in a C-shaped sealing ring at the upper part of the shielding main pump according to the sequence of a fixed-distance drill, a vacuum waste liquid tank, a filter and a vacuum pump;
and 3, confirming that the interior of the evacuation device becomes negative pressure through a vacuum meter on the vacuum waste liquid tank, connecting the pistol drill with the drill bit, and starting the pistol drill to drill.
In step 1, according to actual conditions on site, a distance drill (a dismantled pistol drill) is erected between two adjacent main bolts, the distance drill and an upper C-shaped sealing ring are confirmed to be well sealed, then the head of a drill bit is abutted against the upper C-shaped sealing ring, and a fixing ring is fixed at a corresponding position of a drill rod according to a required moving distance.
In step 3, the vacuum pump is started, the vacuum gauge on the vacuum waste liquid tank is used for confirming that the inside of the device is changed into negative pressure and the vacuum degree is not changed any more, the pistol drill is connected with the drill bit, the pistol drill is set at a low rotating speed (about 100 plus 200 revolutions per minute), the pistol drill is started to drill, the stability and the direction are kept in the process, and when the upper C-shaped sealing ring is about to be drilled through, the pressure is relieved, and the drill bit is prevented from being damaged. When the drill bit needs to be replaced in drilling, the negative pressure in the device is firstly confirmed, and the framework sealing is carefully damaged when the drill bit is pulled out.
Step 4, after drilling through the upper C-shaped sealing ring, if liquid flows in the pipeline and the vacuum waste liquid tank has liquid to be overturned, closing a valve of an exhaust port of the vacuum waste liquid tank; if no liquid flows in the pipeline, the distance drill is detached, a hose for suction is connected with the pipeline, and the hose is inserted into the C-shaped ring drill hole at the upper part to suck the radioactive residual liquid below the height of the drill hole; after the residual liquid is completely absorbed, the valves of the water inlet and the exhaust port of the vacuum waste liquid tank are closed, and then the vacuum pump is closed.
As shown in fig. 13-19, the upper C-ring cutting tool includes a circumferential guide rail 32, a circumferential slide 36, a radial guide rail 37, a radial slide 38, an angle grinder 310. The circumferential guide rail 32 is mounted on the main pump flange 313 through a circumferential support assembly, so that a gap is left between the circumferential guide rail 32 and the main pump flange 313, that is, the circumferential guide rail is raised to a certain height from the main pump flange 313, so that the circumferential sliding block 36 can slide on the circumferential guide rail 32. The circumferential slider 36 is mounted on the circumferential guide rail 32 such that the circumferential slider 36 can slide circumferentially along the circumferential guide rail 32. The radial guide rails 37 are fixed to the circumferential slide blocks 36, and the radial slide blocks 38 are mounted on the radial guide rails 37 such that the radial slide blocks 38 can slide radially along the radial guide rails 37. The angle grinder 310 is mounted on the radial slider 38.
The circumferential guide rail 32 is made of carbon steel material, and is an annular rail with a radian of 30 degrees. In order to reduce the weight of the track, the circumferential guide rail 32 is provided with a plurality of strip-shaped holes 321.
The circumferential support assembly includes a first circumferential rail pad 31, a second circumferential rail pad 34, a bottom support block 327, a screw 324, and a bolt 314. The first circumferential guide pad 31 and the second circumferential guide pad 34 are over-fitted to the main pump flange bolt holes, and the first circumferential guide pad 31 and the second circumferential guide pad 34 are provided between the main pump flange 313 and the circumferential guide 32. When the first circumferential guide pad 31 and the second circumferential guide pad 34 are installed, the gap between the circumferential guide and the main pump flange 313 is kept uniform, for example, the installation height is ensured to be equal, so that the circumferential guide 32 can be horizontally installed relative to the main pump flange, and the C-ring can be cut by force uniformly when the angle grinder moves circumferentially. The bottom support block 327 is disposed at a lower portion of the main pump flange 313 and is coaxially disposed with the second circumferential guide pad 34, and the bottom support block 327 and the second circumferential guide pad 34 are connected by a screw 324 passing through a main pump flange bolt hole and are fixed by a bolt 314 disposed at a lower portion of the main pump flange 313. According to the mode, the installation and fixation of the circumferential guide rail and the main pump flange can be realized. The lower surface of the circumferential sliding block 36 and the upper surface of the circumferential guide rail 32 are finely ground by a grinding machine, sliding friction is generated between the lower surface of the circumferential sliding block 36 and the upper surface of the circumferential guide rail 32, and lubricating oil or lubricating grease is smeared between the circumferential sliding block 36 and the circumferential guide rail 32 when the upper C-ring is cut.
Preferably, there are three first circumferential guide pads 31, two second circumferential guide pads 34, two bottom support blocks 327, two threaded rods 324 and two threaded bolts 314. The two ends and the middle part of the circumferential guide 32 are respectively installed on the main pump flange 313 through a first circumferential guide pad 31, and a second circumferential guide pad 34 is installed between two adjacent first circumferential guide pads 31.
The circumferential sliding block 36 comprises a sliding block body 335 and a plurality of bearings 333 symmetrically arranged at the bottom of the sliding block body 335. After the circumferential slide 36 is mounted to the circumferential guide 32, the bearing 333 is clamped to the circumferential guide 32 by adjusting an eccentric nut 334 mounted within the bearing 333. Preferably, there are 4 bearings 333 symmetrically disposed at four ends of the slider body 335. The bearing is a tight bearing, and the bearing and the circumferential sliding rail are clamped tightly by adjusting the eccentric nut.
The radial guide 37 is a slider with a groove, which is fixed to the circumferential slider 36 by screws. And a radial limiting block 33 is arranged in the groove 371 of the radial guide rail 37. The radial stopper 33 is fixed to the radial guide rail 37 through a first bolt hole 319 formed in the bottom of the radial stopper. The radial stopper 33 is an L-shaped stopper. The upper portion of the radial limiting block is provided with a second bolt hole (the mounting position of the second nut 321), and the second bolt hole 322 is used for mounting the guide rod 372. The bottom of the radial sliding block 38 is provided with a sliding groove which slides along the guide rod 372. The radial slider 38 slides on the radial guide 37 along the guide 372. The radial limiting block is arranged in the radial guide rail close to the inner side of the flange of the main pump so as to limit the radial sliding block on the radial slide rail and avoid separation due to large force during machining attack. Wherein, the L opening of radial stopper is inboard towards the main pump flange, can be convenient for like this install the regulation. In order to firmly fix the radial limiting block, an inner side groove is formed in the bottom of the groove, and the bottom of the radial limiting block is clamped in the inner side groove.
The radial slider 38 is provided with a locking nut 35, through which the locking nut 35 passes for radially fixing the radial slider on the radial guide 37. In particular, the lock nut may abut the guide rod 372 to define the radial position of the radial slider on the radial guide.
The angle grinder 310 is mounted on the radial slide 38 by means of an angle grinder support 39. The angle grinder support 389 is fixed to the radial slider 38 by a bolt. The angle grinder 310 adopts the existing angle grinder structure, and includes a grinding wheel, a driving pulley, a driven pulley, a power mechanism, and a belt.
The angle grinder 310 is externally provided with a housing 311, the housing is connected with the angle grinder 310 through a U-shaped hoop 330, and the mode is flexible in installation and adjustable in position. The cover can prevent the grinding wheel from being accidentally broken and splashed, and the safety of operators is protected. The cover is provided with a chip removal port for being in butt joint with a dust collector, so that chips can be removed conveniently. The housing is also provided with a compressed air interface which is externally connected with compressed air for cooling and provides a compressed air cooling flow channel for high-heating components such as the belt pulley and the like.
The device can be provided with two groups which are respectively arranged at two sides of the flange of the main pump.
When the cutting device is used, the C ring is cut by the cutting assembly, the radial limiting block is adjusted to determine the radial feeding amount, the radial feeding is performed firstly, then the circumferential feeding is performed, the abrasion of the polishing sheet is considered during the feeding, and the feeding is performed alternately clockwise and anticlockwise. In the upper C ring cutting process, a certain cutting allowance is reserved, for example, a 0.1mm allowance is reserved at the cutting position, and the C ring is not cut through. And after the whole circle of cutting is finished, cleaning all visible scraps by blowing. Finally, the residual cutting seam is chipped by using a flat chisel. At this time, the C ring is broken in a tearing mode, no foreign matter is generated, and meanwhile, the radioactive substances in the C ring cannot escape.
As shown in fig. 20 to 23, the pump case shield and protection tool includes a foreign object prevention plate and a plurality of foreign object prevention plate supports 47 provided on the foreign object prevention plate. The foreign matter prevention plate is a splicing structure that the cover plate 48 is fully welded on the support ring 47. The support ring 47 is a 10mm carbon steel ring, and for reducing weight, the cover plate is a steel plate with the thickness of 2 mm. The foreign object prevention plate support 45 presses the cover plate 48 to the pump case 44 for sealingly mounting the foreign object prevention plate on the pump case 44. In order to further improve the sealing performance, a rubber pad is arranged on the support ring 47, for example, a 5mm rubber pad is adhered to the support ring 47 and is in direct contact with the pump shell.
The cover plate 48 is provided with a pump shell drainage connector 46 which is arranged at the center of the cover plate 48, the pump shell drainage connector 46 is connected with a drainage hose, and a pump cavity floor drain is directly caused and used for draining residual condensed water in the pump shell and a loop.
Specifically, the foreign object prevention plate support 45 includes a fixing section 451, a connecting section 452, and a fitting section 453. One end of the fixing section 451 is welded and fixed to the foreign object preventing plate 48, and the other end thereof is connected to one end of the connecting section 452. The fitting section 453 has one end connected to the other end of the connection section 452 and the other end for fixing with the pump case 44. The fixing section 451 is vertically disposed with respect to the foreign object prevention plate 48, the connection section 452 is disposed in parallel with respect to the foreign object prevention plate 48, and the assembling section 453 is an L-shaped section having a screw hole in a section parallel with the foreign object prevention plate 48. Preferably, the foreign object prevention plate support members are four in number, and are symmetrically distributed on the foreign object prevention plate, so that the foreign object prevention plate can be stably installed.
Overall structure, two people can realize above-mentioned foreign matter prevention board with prevent foreign matter support piece with the rope and promote, alone pump case department construction bolt fixed can, when preventing that the foreign matter board promotes the back that targets in place, only install as in figure 20 the non-sharing bolt 41 can.
The shield guard also includes a plurality of lead support members 49, a lead support member attachment ring 411, and lead support tie bars 410. The lead sheath supporting pieces 49 are arranged in a radial structure centering on the lead sheath supporting connecting ring 411, and the lead sheath supporting lacing wire 410 is connected with the lead sheath supporting pieces 49 in a winding manner around the radial structure and wound for a plurality of turns to form a net structure. Lead sheath support piece go-between 411 is the carbon steel ring, lead sheath support piece is 30mm 4 equilateral angle steel, lead sheath support lacing wire 410 is the diameter 5.5mm reinforcing bar. And the plurality of lead sheath supporting pieces, the lead sheath supporting piece connecting rings and the lead sheath supporting lacing wires are welded to form a net structure.
The net-shaped structure is arranged above the foreign matter preventing plate, and a gap between the net-shaped structure and the foreign matter preventing plate is paved by a lead sheath. The gap is 150 mm.
The shield and protection device further comprises a profiled bolt assembly comprising a profiled bolt 441 for implanting in the pump housing and a lead screw 442 connecting the profiled bolt. The lead screw 442 is used for penetrating through a bolt hole at the tail end of the lead sheath supporting piece, and the net-shaped structure is fixed through a lead screw nut.
Before the shielding and protecting tool is installed, the special-shaped bolt assembly is implanted into the pump shell to prepare for fixing the shielding and protecting device. Two people lift the net structure with ropes. And after the bolt hole of the lead sheet support penetrates into the screw rod of M20 x 250 of the special-shaped bolt assembly, the screw rod nut is installed. At this moment, the pump shell foreign matter prevention cover plate assembly and the lead sheet supporting assembly can generate a gap of 150mm, the lead sheet is uniformly laid in the gap to realize the shielding effect, then the lead screw nut is fastened, and the installation of the shielding protection device is completed at this moment.
The quick installation of this shielding protection instrument establishes the basis for work such as follow-up shielding main pump removes to hoist and mount mouth together with shielding main pump installation dolly, shielding main pump couple and shielding pump installation and shielding main pump installation dolly rotation, reaches the purpose of preventing the foreign matter simultaneously.
As shown in fig. 24-28, the impeller shield and rotor locking tool includes a housing 54, shield legs 52 provided on the housing 54, and bolt fasteners 510 provided on the top of the housing 54.
The housing 54 is adapted to be mounted to the pump body of the canned motor pump to house the impeller assembly of the canned motor pump within the housing 54 to provide radioactive shielding of the impeller assembly. The shield legs 52 are provided in plurality and are evenly distributed around the circumference of the outer wall of the shield body 54. The shielding case leg 52 may be a bracket formed by two connecting rods, and a connecting plate for bolting to the outer wall of the cover body 54 is welded at one end of the bracket; the other end of the bracket is welded with a connecting plate for connecting the cover body by a bolt, the connecting plate is provided with a flange connecting hole, and the bolt penetrates through the flange connecting hole and a hole of a pump body main flange of the shield pump so as to connect the support leg of the shield cover with the pump body main flange 51. In order to protect the surface of the pump body main flange 51 from being abraded, a gasket 58 is arranged at the connecting position of the pump body main flange and the shielding case supporting leg, and when the pump body main flange is connected with the shielding case supporting leg, the gasket 58 is padded between the pump body main flange and the connecting plate at the tail end of the shielding case supporting leg 52.
In order to prevent the radioactive medium of the impeller assembly from leaking from the gap between the cover body 54 and the main flange of the pump body, in this embodiment, two O-shaped bottom sealing rings 5411 are embedded in the bottom surface of the cover body 54, and after the shielding cover leg 52 is connected and locked with the main flange of the pump body, the O-shaped sealing rings can seal the bottom of the cover body, so as to prevent the radioactive medium which is not completely scattered in the impeller assembly of the shielding pump from flowing out.
The top of the housing 54 is provided with a circular recess 59, and a bolt fastener 510 is provided in the recess 59 for locking the rotor assembly of the canned motor pump. A top cover 55 is also provided on top of the enclosure 54. The top cover plate 55 is a circular plate having a diameter larger than that of the recess 59, and a cover coupling plate 56 for coupling the cover 54 is provided around the top cover plate 55. The top of the housing 54 is provided with a plurality of cover plate connectors 57, such as screw holes, around the recessed platform 59 for connecting cover plate connectors, and bolts are passed through the housing connector plates 56 to connect the cover plate connectors 57, thereby mounting the top cover plate 55 over the recessed platform 59. The top of the cover 54 is further provided with a top sealing ring 5431, the top sealing ring 5431 is located around the recessed platform 59, and the top cover plate 55 presses on the top sealing ring 5431 to seal the top of the cover 54.
The cover 54 in this embodiment includes a bottom cylinder 541, a middle cylinder 542, and a top cover 543, which are connected in sequence from bottom to top. The bottom cylinder 541 is a cylinder with an equal diameter, the middle cylinder 542 is a cylinder with a diameter reduced from bottom to top, and the top cover 543 is a cover with a diameter reduced from bottom to top. Two bottom seals 5411 are provided at the bottom edge of the bottom cylinder 541 and at least three shield legs 52 are evenly distributed along the outer wall circumference of the middle cylinder 542.
In summary, the use method of the impeller shielding and rotor locking tool comprises the following steps:
the main pump is wholly demolishd and is removed to the hoist and mount mouth after, hangs the installation cover body 54 through the factory building ring: the pad plates 58 are arranged between the shield leg 52 and the pump body main flange, and the shield leg and the pump body main flange are connected together through bolts, so that the two bottom sealing rings 5431 at the bottom of the cover body 54 are fully compressed, the sealing at the lower part of the cover body 54 can be realized, and meanwhile, partial radioactive dose at the impeller of the shield pump is effectively shielded. The rotor assembly of the canned motor pump is then lifted into position by the plant ring crane mounting bolt fasteners 510. Next, the top cover plate 55 is installed by a plant ring crane, the top seal ring 5411 of the cover 54 is compressed by the weight of the top cover plate, and the top cover plate 55 and the top of the cover 54 are connected by bolts, thereby sealing the upper part of the cover.
The invention also provides a process for integrally disassembling the large-scale shielding main pump in the radioactive environment, which adopts the device for integrally disassembling the large-scale shielding main pump in the radioactive environment and comprises the following steps:
step 1, removing an external heat exchanger 61 and auxiliary components for shielding a main pump;
step 2, disassembling 20 symmetrically arranged main bolts 64 (24 in total) by using the main bolt pneumatic disassembling tool;
step 3, installing the residual liquid drainage tool in the upper C-shaped ring to finish drainage of the radioactive residual liquid in the upper C-shaped sealing ring;
step 4, installing the upper C-shaped ring cutting tool to complete the cutting of the upper C-shaped sealing ring 63 of the cuttable area;
step 5, installing 4 main bolts by using the main bolt pneumatic dismounting tool;
step 6, disassembling 4 main bolts with uncut upper C-shaped sealing ring accessories by using the main bolt pneumatic disassembling tool;
step 7, installing the upper C-shaped ring cutting tool to complete the cutting of the upper C-shaped sealing ring in the remaining area;
step 8, mounting a shielding main pump mounting trolley around the shielding main pump to support the weight of the shielding main pump;
step 9, disassembling the remaining 4 main bolts by using the main bolt pneumatic disassembling tool;
step 10, utilizing a shielding main pump to install a trolley, descending and moving out the shielding main pump installation trolley with the shielding main pump according to a preset route;
step 11, mounting the pump shell shielding and protecting tool to the pump shell 62 to play a role in preventing foreign bodies and shielding;
step 12, mounting the impeller shield and rotor locking tool to the impeller;
and step 13, installing a main lifting appliance and a lifting facility for lifting the shielding main pump, lifting the shielding main pump out of the shielding main pump compartment, and finishing the integral disassembly work of the shielding main pump.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A large-scale shielding main pump integral dismounting device in radioactive environment comprises a main bolt pneumatic dismounting tool, an upper C-shaped ring residual liquid dredging tool, an upper C-shaped ring cutting tool, a pump shell shielding protection tool, an impeller shielding and a rotor locking tool, and is characterized in that,
the main bolt pneumatic dismounting tool comprises a main bolt hoisting assembly and a main bolt lifting assembly, wherein the main bolt hoisting assembly comprises a lifting lug, a pulley arranged at the lower end of the lifting lug, a universal lifting bolt, a winch and a steel wire rope connected with the universal lifting bolt and the winch through the pulley, and the upper end of the lifting lug is provided with an external thread matched with a threaded hole of a pump shell;
the main bolt lifting assembly comprises a support frame arranged on a main flange, two guide rods arranged below the main flange and connected with the support frame, a cylinder fixing plate arranged at the lower ends of the two guide rods, a sliding connecting plate connected to the two guide rods in a sliding manner, a main bolt rotary joint arranged on the sliding connecting plate, and a cylinder arranged below the cylinder fixing plate, wherein the output end of the cylinder penetrates through the cylinder fixing plate and is connected to the sliding connecting plate;
the tool for dredging and discharging the residual liquid in the upper C-shaped ring comprises a vacuum waste liquid tank, a filter, a vacuum pump and a fixed-distance drill; the distance drill is positioned on the upper C-shaped sealing ring and used for distance drilling; the liquid discharge hole of the distance drill is connected with the vacuum waste liquid tank through a pipeline, and the vacuum waste liquid tank is sequentially connected with the filter and the vacuum pump through pipelines;
the upper C-shaped ring cutting tool comprises a circumferential guide rail, a circumferential sliding block, a radial guide rail, a radial sliding block and an angle grinder; the circumferential guide rail is mounted on the main pump flange through a circumferential support body assembly, so that a gap is reserved between the circumferential guide rail and the main pump flange; the circumferential sliding block is arranged on the circumferential guide rail, so that the circumferential sliding block can slide along the circumferential direction of the circumferential guide rail; the radial guide rail is fixed on the circumferential sliding block, and the radial sliding block is arranged on the radial guide rail so that the radial sliding block can slide along the radial guide rail in the radial direction; the angle grinder is mounted on the radial sliding block;
the pump shell shielding and protecting tool comprises a foreign matter preventing plate and a plurality of foreign matter preventing plate supporting pieces arranged on the foreign matter preventing plate; the foreign matter prevention plate is a splicing structure with a cover plate fully welded on the support ring; the foreign matter prevention plate support is used for installing the foreign matter prevention plate on the pump shell in a sealing way; the cover plate is provided with a pump shell drainage joint;
the impeller shielding and rotor locking tool comprises a cover body, shielding cover supporting legs arranged on the cover body and bolt fasteners arranged at the top of the cover body, wherein flange connecting pieces are arranged at the tail ends of the shielding cover supporting legs.
2. The device for disassembling the large-scale shielding main pump in the radioactive environment as claimed in claim 1, wherein a positioning plate is arranged at the upper part of the supporting frame, and a positioning arc matched with the main flange hole is arranged at the middle part of one side of the positioning plate.
3. The device for integrally disassembling the large shielded main pump in the radioactive environment according to claim 1, wherein the cylinder is connected with a cylinder control system, which comprises two speed regulating valves, a pneumatic position retaining valve, an emergency stop button silencer, two joints, a shuttle valve and a pneumatic control box; the rodless cavity and the rod cavity of the air cylinder are respectively connected with a speed regulating valve, the two speed regulating valves are connected to a pneumatic position retaining valve, the pneumatic position retaining valve is connected to an emergency stop button, the emergency stop button is connected to a shuttle valve, two ends of the shuttle valve are respectively connected to a pneumatic control box through a connector, and the pneumatic position retaining valve is further connected to the two connectors.
4. The device for integrally disassembling the large-scale shielding main pump in the radioactive environment according to claim 3, wherein the pneumatic control box comprises an air source inlet pipe, a water drop separator, a residual pressure release valve, an air filter, a pressure reducing valve, an air tank, a precision pressure reducing valve, a pressure switch and a manual valve which are connected in sequence, and the water drop separator, the air filter and the air tank are connected with a water collecting tank.
5. The device for integrally disassembling the large-scale shielding main pump in the radioactive environment according to claim 1, wherein the distance drill comprises a drill bit, a drill chuck, a pistol drill and a supporting mechanism; the drill bit penetrates through the drill chuck, the head end of the drill bit is used for abutting against the upper C-shaped sealing ring to drill a hole, and the tail end of the drill bit is connected with the drill chuck of the pistol drill through the fixing ring; the front part of the drill chuck is designed with an intersecting line shape consistent with the upper C-shaped sealing ring, and the drill chuck is provided with a liquid discharge hole communicated with a drill bit passing through a channel; the supporting mechanism is used for supporting between two main bolts of the shielding main pump and applying pressure to the drill chuck, so that the drill chuck can be tightly attached to the upper C-shaped sealing ring.
6. The device for integrally disassembling the large-scale shielding main pump in the radioactive environment according to claim 5, wherein the drill chuck comprises a drill chuck front cover and a drill chuck rear cover; and an irradiation-resistant sealing gasket is arranged between the drill chuck front cover and the drill chuck rear cover and is fastened through screws.
7. The device for integrally disassembling the large-scale shielded main pump in the radioactive environment according to claim 1, wherein the circumferential support body assembly comprises a first circumferential guide rail cushion block, a second circumferential guide rail cushion block, a bottom support block, a screw rod and a bolt; the first circumferential guide rail cushion block and the second circumferential guide rail cushion block are in over fit with a main pump flange bolt hole, and the first circumferential guide rail cushion block and the second circumferential guide rail cushion block are arranged between a main pump flange and a circumferential guide rail; the bottom supporting block is arranged on the lower portion of the main pump flange and is coaxially arranged with the second circumferential guide rail pad, and the bottom supporting block and the second circumferential guide rail pad are connected through a screw rod passing through a main pump flange bolt hole and are fixed through bolts arranged on the lower portion of the main pump flange.
8. The device for integrally disassembling the large-sized shielded main pump in the radioactive environment according to claim 7, wherein there are three first circumferential guide pad blocks, and there are two second circumferential guide pad blocks, the bottom support block, the screw rod and the bolt; two ends and the middle part of each circumferential guide rail are respectively installed on the main pump flange through a first circumferential guide rail cushion block, and a second circumferential guide rail cushion block is installed between every two adjacent first circumferential guide rail cushion blocks.
9. The device for integrally disassembling the large-scale shielding main pump in the radioactive environment according to claim 1, wherein the foreign matter prevention plate support comprises a fixing section, a connecting section and an assembling section; one end of the fixed section is welded and fixed on the foreign matter prevention plate, and the other end of the fixed section is connected with one end of the connecting section; one end of the assembling section is connected with the other end of the connecting section, and the other end of the assembling section is used for being fixed with the pump shell; the fixed section is relative prevent that the foreign matter board sets up perpendicularly, the linkage segment is relative prevent that foreign matter board parallel arrangement, the assembly segment is L type section, its have the screw hole the segmentation with prevent that the foreign matter board is parallel.
10. The integral dismounting process of the large-scale shielding main pump in the radioactive environment, which adopts the integral dismounting device of the large-scale shielding main pump in the radioactive environment according to claim 1, is characterized by comprising the following steps:
step 1, removing an external heat exchanger and accessory parts for shielding a main pump;
step 2, disassembling 20 symmetrically arranged main bolts by using the main bolt pneumatic disassembling tool;
step 3, installing the residual liquid drainage tool in the upper C-shaped ring to finish drainage of the radioactive residual liquid in the upper C-shaped sealing ring;
step 4, installing the upper C-shaped ring cutting tool to complete cutting of the upper C-shaped sealing ring of the cuttable area;
step 5, installing 4 main bolts by using the main bolt pneumatic dismounting tool;
step 6, disassembling 4 main bolts with uncut upper C-shaped sealing ring accessories by using the main bolt pneumatic disassembling tool;
step 7, installing the upper C-shaped ring cutting tool to complete the cutting of the upper C-shaped sealing ring in the remaining area;
step 8, mounting a shielding main pump mounting trolley around the shielding main pump to support the weight of the shielding main pump;
step 9, disassembling the remaining 4 main bolts by using the main bolt pneumatic disassembling tool;
step 10, utilizing a shielding main pump to install a trolley, descending and moving out the shielding main pump installation trolley with the shielding main pump according to a preset route;
step 11, installing the pump shell shielding protection tool to play a role in preventing foreign bodies and shielding;
step 12, mounting the impeller shield and rotor locking tool to the impeller;
and step 13, installing a main lifting appliance and a lifting facility for lifting the shielding main pump, lifting the shielding main pump out of the shielding main pump compartment, and finishing the integral disassembly work of the shielding main pump.
CN202010518980.XA 2020-06-09 2020-06-09 Large-scale shielding main pump integral dismounting device and dismounting process in radioactive environment Pending CN111963486A (en)

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Application publication date: 20201120