CN111649006B

CN111649006B - Large-scale shielding main pump integral reloading device and reloading process in radioactive environment

Info

Publication number: CN111649006B
Application number: CN202010519915.9A
Authority: CN
Inventors: 李涛; 李松; 耿加森; 董宝泽; 王斌元; 廖长城; 王信东; 曹阳; 郦元辉; 王扬; 王超; 林鑫辉; 杨志业
Original assignee: Sanmen Nuclear Power Co Ltd
Current assignee: Sanmen Nuclear Power Co Ltd
Priority date: 2020-06-09
Filing date: 2020-06-09
Publication date: 2021-05-04
Anticipated expiration: 2040-06-09
Also published as: CN111649006A

Abstract

A large-scale shielding main pump integral reloading device and reloading process in a radioactive environment belong to the technical field of large-scale shielding main pump maintenance of nuclear power stations. The device comprises a biological shielding assembly, a C-shaped sealing ring back chipping assembly, a biological shielding blocking plate lifting assembly, a main bolt hole cleaning and checking assembly and a main bolt pneumatic dismounting assembly. The method is simple to operate, and the large-scale shielding main pump can be safely and efficiently assembled again.

Description

Large-scale shielding main pump integral reloading device and reloading process in radioactive environment

Technical Field

The invention relates to the technical field of maintenance of large-scale shielded main pumps of nuclear power stations, in particular to an integral reloading device and a reloading process of a large-scale shielded main pump in a radioactive environment.

Background

After a nuclear power plant 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 the whole disassembly process of the shielding main pump is planned in the nuclear power plant, so that the whole reinstallation process of the shielding main pump in a radioactive environment is necessary to be planned and developed 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 reloading process of the large shielding main pump in a 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 reloading process of the shielding main pump, the factors restricting the overall reloading of the shielding main pump are mainly as follows:

the biological shielding device which can be remotely disassembled and assembled under the high-radioactivity environment needs to be researched and developed: the shielding main pump is hung upside down at the evaporimeter bottom, and when the shielding main pump of damage demolishs the back, pump case bottom opening, and environmental dose is very high, seriously influences follow-up repair and the inspection work of remaining C type ring, welding seam to the pump case terminal surface, consequently must carry out effectual shutoff to the opening. Through comprehensive analysis of site working conditions, pump shell structures and disassembly and assembly processes, factors for restricting plugging in the prior art are mainly as follows: (1) the weight is large, about 2T (the shielding effect and the weight are comprehensively considered for achieving the effective shielding material selection of the evaporator with high dosage); (2) the fall is large, and the distance between the pump shell and the ground is about 6 m; (3) the radial positioning precision is higher; (4) the subsequent operations such as cutting of the residual C-shaped ring and repair of the end face of the pump shell are required to be facilitated; (5) the radioactive environment has high dose. Therefore, a biological shielding device and an installation tool thereof which can be rapidly and remotely controlled in a high-radioactivity environment are urgently needed, the biological shielding device is remotely and rapidly assembled and disassembled by accurately positioning the axial direction and the radial direction, and a foundation is laid for the installation and implementation of a subsequent cutting and repairing tool for the residual C-shaped ring of the pump shell.

The C-shaped sealing ring back chipping device of the pump shell of the shielding main pump needs to be researched and developed: the shielding main pump is hung upside down at the bottom of the evaporator, and when the damaged shielding main pump is removed, the bottom of the pump shell is opened, the environmental dosage is very high, and the follow-up repairing and checking work of a residual C-shaped sealing ring and a welding line on the end face of the pump shell is seriously influenced. When the damaged main pump is removed, the bottom of the pump shell is opened, the environmental dosage is very high, and the repair and inspection work of personnel for a long time is not facilitated. When the biological shielding device is used, if the interference problem of the biological shielding device, the lifting device and the C-shaped sealing ring cutting device cannot be well solved, the C-shaped sealing ring cannot be continuously cut during effective shielding, or the high-level environment in the main pump cannot be effectively shielded during continuous cutting. The invention mainly aims to solve the interference problem of cooperative work of a biological shielding device, a lifting device and a C-shaped sealing ring cutting device under a high-level environment of a nuclear power shielding main pump, so that an operator can remotely control the biological shielding device, the lifting device and the C-shaped sealing ring cutting device under the condition of effectively shielding high-level environment.

The chain type lifting device for shielding the installation of the main pump biological shielding blocking plate needs to be researched and developed: the biological shielding device and the C-shaped sealing ring back-chipping device for the pump shell of the shielding main pump are heavy in weight, and a foundation is laid for realizing remote quick assembly and disassembly of the biological shielding device and for installation and implementation of subsequent cutting and repairing tools for C-shaped residual rings of the pump shell. There is a need for a chain lifting device that can be operated quickly and remotely in a highly radioactive environment and that is stable and reliable. Through comprehensive analysis of field working conditions, pump shell structures and biological shielding blocking plate dismounting and mounting processes, the factors for restriction in the prior art are mainly as follows: (1) the lifting weight is large: in order to effectively shield the high dose of the evaporator, the biological shielding blocking plate takes stainless steel as a main body structure, and lead is filled in the middle; (2) the lifting fall is large: the pump casing is about 6m away from the ground; (3) it is required to facilitate subsequent operations such as cutting of the residual C-shaped ring and repair of the weld of the pump casing end face. Therefore, a lifting tool for remotely controlling the biological shielding blocking plate of the shielding main pump in a high-radioactivity environment is urgently needed, the biological shielding blocking plate of the pump shell is remotely and quickly assembled and disassembled, and meanwhile, a foundation is laid for the subsequent installation and implementation of tools for cutting off residual C-shaped rings of the pump shell and repairing flange surfaces of the pump shell.

The implementation difficulty of online inverted cleaning and inspection of the main bolt hole of the pump shell is as follows: in the whole replacement and maintenance process flow of the main pump, based on the structural design of the shielding main pump, a main bolt for connecting the main pump with the pump shell needs to be repeatedly disassembled and assembled. The kingbolt of shielding main pump relies on the mode of kingbolt heater heating to install the fastening, and the lentai 8013 of anti-bite agent has all been paintd to kingbolt screw thread department, and solidification appears in the long-time high temperature environment of anti-bite agent process for form on the screw thread of kingbolt hole and prevent stinging the agent sediment. Before the shielding main pump is replaced, in order to ensure the installation quality of the main bolt and prevent jamming and seizure, the main bolt hole on the pump shell must be cleaned. The cleaning of the main bolt hole has the following restriction factors: 1. the main bolt hole is longer because of its inside degree of depth, and arranges for inverting, leads to the maintainer to wash the main bolt hole comparatively difficultly, and clear effect is not obvious. 2. After the shielding main pump runs for a long time, the radioactive dose carried in the pump shell of the shielding main pump is large. The longer it takes to clean the main bolt holes, the higher the risk of contamination of the service personnel will be accordingly. Therefore, a special device for online inverted cleaning and checking of the main bolt hole of the pump shell needs to be designed, the radiation protection safety of workers is guaranteed, the cleanliness of the main bolt hole of the main pump is shielded, and meanwhile, the operation controllability of the device and the process, the convenience of personnel operation and the like need to be guaranteed.

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 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 main pump dismantling and installing work of the main bolt, the key path time is greatly increased, and the total radiation dose of maintenance personnel is improved; (2) the inspection and adjustment of the extension amount of the main bolt of the shielding main pump are carried out for multiple times in the service life, which relates to the disassembly and assembly work of the main bolt, but the main bolt is disassembled and assembled by a trolley installed on the shielding main pump, and a large amount of materials in an evaporator compartment need to be disassembled; (3) the main bolt dismounting work needs that the maintainer uses with the help of the socket spanner and the main bolt dismounting tool in a matching way, and because the main bolt is arranged in an inverted mode, the main bolt has the risk of tipping over when falling down. 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.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a disassembling device and a disassembling process for a large-scale shielding main pump in a radioactive environment, which are simple to operate and can safely and efficiently finish the re-assembly 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 reloading device in radioactive environment comprises a biological shielding assembly, a C-shaped sealing ring back chipping assembly, a biological shielding blocking plate lifting assembly, a main bolt hole cleaning and checking assembly and a main bolt pneumatic dismounting assembly,

the biological shielding component comprises a biological shielding blocking plate and a blocking plate support, the biological shielding blocking plate is supported above the blocking plate support, the blocking plate support is a remote control self-winding blocking plate support, and the assembly and disassembly of the biological shielding blocking plate and the nuclear reactor main pump shell are realized by remotely controlling the position and the posture of the blocking plate support on which the biological shielding blocking plate is supported;

the C-shaped sealing ring back chipping assembly comprises a suspension arm, a main shaft moving ring and a shielding plate; the main shaft rotating ring is arranged between the shielding plate and the suspension arm; the main shaft rotating ring is rotationally connected with the suspension arm and the shielding plate; a turning tool is arranged on the main shaft moving ring;

the biological shielding closure plate lifting assembly comprises a suspension arm assembly and a fixed mounting assembly; the suspension arm assembly comprises a plurality of suspension arms and chain lifting mechanisms arranged in each suspension arm; the chain lifting mechanism is connected with a chain hanging point of a fixed mounting assembly mounted on the pump shell through one end of a chain in the chain lifting mechanism, and the other end of the chain is used for being connected with the shielding blocking plate; the fixed mounting assembly is used for being mounted on a pump shell in advance, and the suspension arm assembly and the shielding blocking plate are fixed on the pump shell after the chain lifting mechanism lifts the shielding blocking plate in place;

the main bolt hole cleaning and checking assembly comprises two fixing nuts, two connecting screw rods, a supporting platform, a lifting mechanism and a cleaning mechanism; the two connecting screw rods are connected to the main bolt hole through the fixing nuts, the supporting platform is connected to the lower parts of the two connecting screw rods, the lifting mechanism is arranged on the supporting platform, and the cleaning mechanism is arranged on the lifting mechanism;

the main bolt pneumatic dismounting assembly comprises a main bolt hoisting assembly and a main bolt lifting assembly, 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 installed on a main flange, a cylinder fixing plate arranged below the main flange and connected with the two guide rods of the support frame, a cylinder fixing plate arranged at the lower ends of the two guide rods, a sliding connection plate arranged on the guide rods, a main bolt rotary joint arranged on the sliding connection 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 with the sliding connection plate.

Preferably, the biological shielding blocking plate comprises two circular truncated cones which are concentrically overlapped and a mandrel arranged at the centers of the two circular truncated cones.

Preferably, a fixed shaft is further arranged between the main shaft moving ring and the shielding plate, and the main shaft moving ring is sleeved on the fixed shaft.

Preferably, the two sides of the main shaft rotating ring are symmetrically provided with a cutter frame rod and a cutter frame rod counterweight; one end of the cutter frame rod is connected with the main shaft moving ring, and the other end of the cutter frame rod is connected with the turning tool.

Preferably, a tool rest and a tool feeding device are further arranged at one end, far away from the main shaft rotating ring, of the tool rest rod; the turning tool is connected with the tool rest rod through the tool rest; the feed device corresponds to the turning tool.

Preferably, the fixed mounting assembly comprises a special-shaped bolt, an intermediate connecting piece, a screw rod and a chain hanging point; the special-shaped bolt is arranged on the pump shell in advance, one end of the middle connecting piece is connected with the special-shaped bolt, and the other end of the middle connecting piece is connected with the lead screw and the chain hanging point; the lead screw is used for fixing the chain lifting mechanism and the shielding blocking plate on the pump shell.

Preferably, the chain lifting mechanism comprises a chain wheel set, a chain, a servo motor and a speed reducer; one end of the chain extends out of one side of the suspension arm to be connected with a chain hanging point, and the chain extends out of the opposite side of the suspension arm through a chain wheel group in the suspension arm to be connected with a shielding blocking plate.

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 lower end of the support frame is provided with a connecting pin, and the upper ends of the two guide rods are provided with connecting pieces matched with the connecting pin.

The invention also provides a large-scale shielding main pump integral reloading process in a radioactive environment, which adopts the large-scale shielding main pump integral reloading device in the radioactive environment and comprises the following steps:

step 1, utilizing the biological shielding blocking plate lifting assembly to install the biological shielding assembly and the C-shaped sealing ring back chipping assembly on a pump shell;

step 2, adjusting the biological shielding assembly and the C-shaped sealing ring back chipping assembly, and setting a cutting feed amount;

step 3, completing cutting and repairing of the residual C-shaped sealing ring of the pump shell;

step 4, cleaning and checking the main bolt hole by using the main bolt hole cleaning and checking assembly;

step 5, utilizing the shielding main pump to install a trolley, and moving the shielding main pump installation trolley with the shielding main pump to a position right below a pump shell according to a preset route;

step 6, adjusting the position of the shielding main pump, and jacking the shielding main pump by using a shielding main pump mounting trolley and an accessory facility;

step 7, mounting 4 main bolts by utilizing the main bolt pneumatic dismounting assembly;

step 8, welding the C-shaped sealing ring of the first part of the weldable area;

step 9, mounting 4 main bolts by utilizing the main bolt pneumatic dismounting assembly;

step 10, disassembling 4 main bolts in a welded area by utilizing the main bolt pneumatic disassembling and assembling assembly;

step 11, welding the C-shaped sealing ring of the remaining part of the weldable area;

step 12, utilizing the main bolt pneumatic dismounting assembly to complete the installation of the rest 20 main bolts;

step 13, adjusting and measuring the elongation of 24 main bolts;

and 14, installing an external heat exchanger and auxiliary components for shielding the main pump.

The invention has the advantages that:

1. through the remote control from the closure plate support of rolling up, can implement remote control to the position that the biological shield closure plate, can long-rangely, accomplish the installation and the dismantlement of biological shield closure plate fast, effectively reduce the radioactive dose of operation personnel, increase substantially maintenance efficiency.

2. The shield plate is indirectly connected with the suspension arm through the main shaft rotating ring instead of being directly connected with the suspension arm, so that only the main shaft rotating ring is arranged between the shield plate and the suspension arm, and other connecting structures are not arranged between the shield plate and the suspension arm, and the turning tool connected to the main shaft rotating ring is not shielded by other connecting structures between the shield plate and the main shaft rotating ring, so that the turning tool can completely rotate, operation of operators is greatly facilitated, and the construction efficiency is improved.

3. Can accomplish the washing to the main bolt hole convenient high-efficiently, avoid the potential hidden danger such as spot splash, washing thoroughly, damage screw thread simultaneously to reduce the maintainer and stain the risk that radioactive medium pollutes.

4. 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.

Drawings

FIG. 1 is an assembled view of the biological shield assembly of the present invention mounted beneath a pump housing;

FIG. 2 is a schematic structural view of a remote-controlled self-rolling shutter bracket of the bio-shielding assembly of the present invention;

FIG. 3 is an assembly view of the bio-shield closure and the remote controlled self-rolling closure bracket of the bio-shield assembly of the present invention;

fig. 4 is an assembly view of the bio-barrier assembly of the present invention mounted below the pump housing.

FIG. 5 is a bottom view of the type C seal ring back gouging assembly of the present invention;

FIG. 6 is a side view of a type C seal ring back gouging assembly in accordance with the present invention;

FIG. 7 is a schematic structural view of a bio-shielding closure lifting assembly according to the present invention;

FIG. 8 is a schematic structural view of the chain lifting mechanism of FIG. 7;

FIG. 9 is a schematic structural view of the fixed mounting assembly of FIG. 7;

fig. 10 is a schematic view showing a structure in which the shielding blocking plate is mounted on the main pump using the structure of fig. 7;

FIG. 11 is a schematic view of the main bolt hole cleaning and inspection assembly of the present invention;

FIG. 12 is a schematic structural view of a pneumatic main bolt dismounting assembly according to the present invention;

FIG. 13 is a schematic structural view of a support bracket of the pneumatic main bolt dismounting assembly according to the present invention;

FIG. 14 is a schematic structural view of a kingbolt lift assembly disposed below a support frame of the kingbolt assembly and disassembly assembly of the present invention;

FIG. 15 is a schematic structural diagram of a pneumatic control box of the main bolt pneumatic dismounting assembly of the present invention;

FIG. 16 is a schematic structural diagram of a cylinder control system of the main bolt pneumatic dismounting assembly according to the present invention;

fig. 17 is a schematic view of 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 a large-scale shielding main pump dismounting device under radioactive environment, includes biological shielding subassembly, C type sealing ring back chipping subassembly, biological shielding closure plate lifting means, main bolt hole cleaning inspection subassembly, the pneumatic dismouting subassembly of main bolt. Wherein:

the biological shielding component comprises a biological shielding blocking plate 13 and a blocking plate bracket 18, wherein the biological shielding blocking plate 13 is supported above the blocking plate bracket 18; the plugging plate support 18 is a remote control self-winding plugging plate support, and the assembly and disassembly of the biological shielding plugging plate 13 and the nuclear reactor main pump casing 112 are realized by remotely controlling the position and the posture of the plugging plate support 18 on which the biological shielding plugging plate 13 is supported.

The biological shielding blocking plate 13 is integrally in a stepped circular truncated cone shape, and the cross section of the biological shielding blocking plate is in a convex shape, namely the biological shielding blocking plate 13 is composed of two circular truncated cones, the small circular truncated cone is positioned above the large circular truncated cone, and the two circular truncated cones are concentrically superposed. The center of the biological shielding closure plate 13, namely the circle centers of the small round platform and the large round platform, is provided with a mandrel 14 for subsequently and accurately installing and cutting a tool for cutting a C-shaped sealing ring 17 on the pump shell. An O-shaped ring 16 can be placed at the step formed by the small circular platform and the large circular platform and used for sealing the biological shielding blocking plate 13 and the pump shell 112 when the biological shielding blocking plate 13 and the pump shell 112 of the nuclear reactor main pump are assembled.

A fixed support plate 12 is arranged on the side wall of the large circular truncated cone of the biological shielding blocking plate 13, and a fixed support plate bolt hole is arranged on the fixed support plate 12. The number of the fixed supporting plates 12 can be 2, 3 or more, and the arrangement mode is preferably that a plurality of the fixed supporting plates 12 are uniformly distributed along the circumferential direction of the side wall of the large circular table of the biological shielding blocking plate 13. The connection mode of the fixed support plate 12 and the large circular table of the biological shielding blocking plate 13 is as follows: a plurality of grooves are radially dug in a large circular table of the biological shielding blocking plate 13, one part of the fixed supporting plate 12 is inserted into the grooves of the large circular table and is fixed by technical means such as a positioning pin shaft 15, the rest part of the fixed supporting plate 12 is positioned outside the side wall of the large circular table, and bolt holes of the fixed supporting plate are arranged on the part of the fixed supporting plate 12 positioned outside the side wall of the large circular table.

The closure support 18 is a remote control self-rolling closure support, and the position and posture can be remotely controlled. The upper part of the plugging plate bracket 18 is designed in a circular truncated cone shape, and the center of the circular truncated cone is provided with a through hole which is matched with the size of the mandrel 14 of the biological shielding plugging plate 13 and is used for the mandrel 14 to pass through; the side wall of the circular truncated cone is provided with a plurality of convex plate-shaped structures along the radial direction, and the plate-shaped structures are provided with guide positioning lifting bolt holes 110. The number of the plate-shaped structures can be 2, 3 or more, and a plurality of plate-shaped structures are preferably distributed uniformly along the circumferential direction of the circular truncated cone side wall on the upper part of the blocking plate bracket in a layout mode. And a hoisting structure of a winch steel wire rope connected with the guiding and positioning hoisting bolt 9 is arranged below the guiding and positioning hoisting bolt hole 110 and used for hoisting the remote control closure plate bracket.

The use principle of the biological shielding component comprises the following steps: the biological shielding blocking plate 13 is supported above the blocking plate bracket 18 and fixed by bolts; before the main pump is not removed and when only four main pump bolts are removed, the guide positioning lifting bolts 19 sequentially penetrate through the guide positioning lifting bolt holes 110 and the pump shell bolt holes 111 of the blocking plate support 18, so that the guide positioning of the blocking plate support 18 is realized; after the main pump is removed, remotely controlling the position and the posture of the blocking plate bracket 18 to enable the blocking plate bracket to support the biological shielding blocking plate 13 to move to the lower part of the pump shell 112, and enabling a small circular platform of the biological shielding blocking plate 13 to block the bottom opening of the pump shell 112; the fixing bolt 11 passes through the fixing support plate bolt hole and the pump shell bolt hole 111 of the biological shielding blocking plate 13 in sequence; and (3) removing the bolts for fixing the biological shielding blocking plate 13 and the blocking plate bracket 18, putting down the blocking plate bracket 18, and removing the guide positioning lifting bolts 19 between the blocking plate bracket 18 and the pump shell 112 to complete the assembly of the biological shielding blocking plate 13 and the pump shell 112.

The C-shaped sealing ring back chipping assembly comprises a suspension arm 21, a main shaft moving ring 22, a shielding plate 23, a lifting device 211 and a power device 24. One end of boom 21 is provided with a through opening 212. The lifting device 211 comprises bolts 2111, a lifting motor 2112 and an idler sprocket 2113. Bolts 2111 correspond to bolt holes in the pump housing flange surface 251, tightening screws 21112 are fixedly connected to the bolts 2111, and the tightening screws 21112 can pass through the through holes 212 provided at one end of the boom 21. A chain 21111 is also fixedly connected to the bolt 111. The idler chain wheel 2113 is arranged at one end of the suspension arm 21 provided with the through hole 212, the lifting motor 2112 is arranged at one end of the suspension arm 21 provided with the through hole 212, the suspension arm 21 is provided with a speed reducer corresponding to the lifting motor 2112, and the lifting motor 2112 is provided with a driving chain wheel corresponding to the idler chain wheel 2113. The chain 21111 is threaded through the through opening 212, and the chain 21111 is looped over the idler sprocket 2113 and the drive sprocket, thereby enabling the drive sprocket to be drivingly connected with the idler sprocket 2113 through the chain 21111.

Wherein, there are at least 3 suspension arms 21, the included angle between two adjacent suspension arms 21 is 120 °, and correspondingly, the number of the lifting devices 211 is the same as that of the suspension arms 21.

The driving shaft collar is arranged between the shielding plate 23 and the suspension arm 21, the driving shaft collar and the shielding plate 23 are concentrically arranged, the driving shaft collar is rotatably connected with the suspension arm 21, a fixed shaft 223 is further arranged between the driving shaft collar and the shielding plate 23, the driving shaft collar is sleeved on the fixed shaft 223, and the fixed shaft 223 is fixedly connected with the shielding plate 23. The tool rest rod 221 and the tool rest rod counterweight 222 are symmetrically arranged on two sides of the driving shaft ring, and the influence of gravity on the tool rest rod 221 is balanced by the tool rest rod counterweight 222, so that the tool rest rod 221 can be kept horizontal. A tool holder 2211 is further arranged at one end of the tool holder rod 221, which is far away from the driving collar, and a turning tool 22111 is arranged on the tool holder 2211. Meanwhile, the tool holder rod 221 is further provided with a mounting groove, a feeding device 2212 is arranged in the mounting groove, and the feeding device 2212 corresponds to the turning tool 22111, so that the turning tool 22111 is fed through the feeding device 2212.

The length of the boom 21 is greater than the distance between the turning tool 22111 and the main shaft rotating ring 22, that is, the length of the boom 21 is greater than the length of the tool rest bar 221, so that when the boom 21 is flanged with the pump housing through the lifting device 211, the lifting device 211 does not interfere with the rotation of the turning tool 22111.

The power device 24 comprises a main shaft cylindrical gear 241 and a turning motor 242. The turning motor 242 is arranged at one end of the boom 21 close to the active shaft collar, and the boom 21 is provided with a speed reducer corresponding to the turning motor 242. The main shaft cylindrical gear 241 is fixedly connected with the main shaft rotating ring 22, and the main shaft cylindrical gear 241 is in transmission connection with the turning motor 242.

Taking 3 booms as an example, in actual operation, the electrical and mechanical integrity of the whole device is checked, and whether the shielding performance of the shielding plate 23 is normal or not is confirmed. After the inspection is passed, the power line is connected with the lifting motor 2112 and the corresponding speed reducer, the interval between the 3 bolts 2111 is adjusted, the 3 bolts 2111 are screwed into the bolt holes of the flange surface 251 of the pump shell until the edges of the bolts 2111 are flush with the lower plane of the pump shell, at this time, the chain 21111 is passed through the through hole 212 of the corresponding suspension arm 21, and the chain 21111 is manually wound on the corresponding idler sprocket 2113 and the driving sprocket, so that the driving sprocket can be in transmission connection with the idler sprocket 2113 through the chain 21111. At this time, a weight is hung below the chain 21111 to tension the chain 21111, the lifting motor 2112 and the corresponding speed reducer are operated to rotate, and the driving sprocket of the lifting motor 2112 drives the idler sprocket 2113 to rotate through the chain 21111, so as to lift the boom 21, and further lift the whole device. The state of the boom 21 is adjusted by individually controlling the operation of each lift motor 2112 until the boom 21 is in a horizontal state. At this time, all the lifting motors 2112 are started simultaneously until the lifting screw 21112 passes through the through hole 212 on the boom 21, after the nut is installed on the lifting screw 21112, all the lifting motors 2112 are continuously started simultaneously until the shielding plate 23 is basically flush with the flange surface 251 of the pump shell, at this time, the lifting motor 2112 and the corresponding speed reducer are stopped, the nut installed on the lifting screw 21112 is screwed until the nut is abutted against the edge of the through hole 212 of the boom 21, the nut is screwed continuously, so that the position of the boom 21 is finely adjusted through the matching between the lifting screw 21112 and the nut, the position of the whole device is finely adjusted, until the shielding plate 23 is moved to the working position, and synchronously, the turning tool 22111 is also moved to the corresponding working position. The power lines of the lifting motor 2112 and the corresponding speed reducer are removed, the turning motor 242 and the power line of the corresponding speed reducer are installed, a battery is installed for the cutter feeder 2212, whether sundries which possibly interfere the turning of the turning tool 22111 exist in the rotating space of the cutter holder rod 221 and the cutter holder rod counterweight 222 is checked, after the sundries pass the checking, the position of the suspension arm 21 is measured by using a dial indicator, and if the position deviates, the nut is continuously screwed for fine adjustment. After the position of the boom 21 is adjusted to the set position, the turning motor 242 and the corresponding speed reducer are started, and the feed device 2212 is started, at this time, the turning motor 242 drives the spindle cylindrical gear 241 to rotate, so that the spindle cylindrical gear 241 drives the spindle rotating ring 22 to rotate, and further drives the turning tool 22111 to rotate by taking the spindle rotating ring 22 as a shaft, thereby completing the cutting of the C-shaped sealing ring 2521 at the sealing weld. Wherein, the power line connected to the turning motor 242 naturally droops under the action of gravity, and the turning motor 242 is disposed on the boom 21, and the drooped power line cannot enter into the rotation space of the turning tool 22111, thereby not affecting the rotation of the turning tool 22111.

The biological shielding closure plate lifting assembly comprises a suspension arm assembly and a fixed mounting assembly. The boom assembly includes a number of booms 33, and a chain hoist mechanism disposed within each boom 33. The chain lifting mechanism is connected with a chain hanging point of a fixed mounting component mounted on the pump shell 31 through one end of a chain 37 in the chain lifting mechanism, and the other end of the chain is used for being connected with a shielding blocking plate (not shown in the figure). The fixed mounting assembly is used for being mounted on the pump shell 1 in advance, and after the chain lifting mechanism lifts the shielding blocking plate in place, the suspension arm assembly and the shielding blocking plate are fixed on the pump shell 31.

Taking the figure as an example, the number of the suspension arms is preferably three, and stable suspension is realized on the premise of utilizing a three-point stability principle and simplifying the structure. The three suspension arms are of a coaxial-core integrated structure, each suspension arm extends outwards from the axis, and the angle between every two adjacent suspension arms is 120 degrees.

As shown in fig. 3, the fixed mounting assembly includes a shaped bolt 312, an intermediate connecting member 313, a screw 315, and a chain hanging point 314. The special-shaped bolt 312 is used for being mounted on the pump shell 31 in advance, one end of the middle connecting piece 313 is connected with the special-shaped bolt 312, and the other end of the middle connecting piece is connected with the screw 315 and the chain hanging point 314. The lead screw 315 is used to fix the chain lifting mechanism and the shield block on the pump housing 31.

The chain lifting mechanism comprises a chain wheel set, a chain 37, a servo motor and a speed reducer 316 arranged outside the suspension arm. One end of chain 37 extends out of one side of boom 33 to be connected with chain hanging point 314, and chain 37 extends out of the opposite side of boom 33 to be connected with the shielding blocking plate through chain wheel set 310 in boom 33. The sprocket set includes a first sprocket 3111 and a second sprocket 3112, and a chain S-wound around the sprocket set such that both protruding ends of the chain are maintained in a vertical direction. In order to prevent the chain from separating from the chain transportation channel in the cantilever when the chain lifting mechanism lifts the chain, the chain lifting mechanism further comprises a chain anti-jump plate 364, wherein the chain anti-jump plate 364 is arranged in the cantilever 33 and surrounds the chain 37 along the chain direction. Taking the figure as an example, there are two chain anti-jump plates 364. One is located first sprocket 3111 department, and its first sprocket department of winding the chain outside facing of the jump guard of chain is equipped with along chain bending angle's arc concave surface A1, and the radian of arc concave surface stops when being close to second sprocket 3112, then the jump guard of chain is equipped with perpendicular A2 near second sprocket department. The arc concave surface is connected with the vertical surface to form a chain anti-jumping first convex part which is just arranged between the first chain wheel 3111 and the second chain wheel 3112 to prevent the chain from separating from the middle position of the two chain wheels. The other is arranged at the position of the second chain wheel 3112, the position of the chain jump preventing plate facing the second chain wheel 3112 wound on the chain outwards is provided with a first arc-shaped concave surface B1 along the bending angle of the chain, and the chain jump preventing plate is arranged at a second arc-shaped concave surface B2 connected with the first arc-shaped concave surface when being close to the first chain wheel 3111. That is, the first arcuate concave surface B1 peaks just before the first sprocket 3111 and then gradually descends with increasing proximity to the first sprocket 3111 to form the second arcuate concave surface B2. The first curved concave surface B1 and the second curved concave surface B2 are connected to form a chain anti-jump second protrusion, and the anti-jump second protrusion is disposed right between the first sprocket 3111 and the second sprocket 3112 to prevent the chain from disengaging from the middle position of the two sprockets.

The mounting device further comprises a boom temporary support 38, the boom temporary support 38 being fixed under the shielding closure 313. Before the shielding closure plate is not lifted, the shielding closure plate is supported on the ground by means of a boom temporary support 38; the boom temporary support 38 is removed after the shield blanking plate is lifted by the boom assembly to a position to facilitate removal of the support. The boom temporary support 38 includes support rods, telescoping rods, and adjusting bolts for moving the shield blanking plate and boom assembly directly under the pump housing. Before the auxiliary shielding blocking plate is installed on the pump shell, the level of the shielding device before lifting is adjusted by adjusting the height of the temporary supporting piece of the suspension arm.

The levelness of the shielding closure plate mounted on the pump shell can be adjusted by means of the following method, when the suspension arm component is used for hoisting the shielding closure plate to the pump shell, and finally the shielding closure plate is implanted into the pump shell. And at the moment, the shielding blocking plate is leveled and fastened by the screw rod upper nut.

In order to ensure the lifting level of the suspension arm and the shielding blocking plate component, an electronic level ruler is arranged on the shielding blocking plate, and the level reading of 3 suspension arms of the shielding blocking plate can be displayed. When the degrees of the 3 positions are all 0, the shielding blocking plate is horizontal relative to the pump shell.

The mounting device further comprises a plurality of universal wheels 311, said universal wheels 311 being provided below each cantilever 33. Because the space of the pump cavity is narrow, the cantilever assembly is moved to the position right below the pump shell of the shielding main pump through the universal wheel 311, and the multidirectional movement of the cantilever assembly can be realized.

The specific installation mode is as follows:

before the suspension arm assembly is put into operation, the fixed mounting assembly is installed. Specifically, the special-shaped bolt 312 is implanted into the pump housing 31, the intermediate connecting member 313 is installed, and the fixing screws of the special-shaped bolt 312 and the intermediate connecting member 313 are tightened. The chain hanging point 314 and the chain 37 are installed (the length of the chain can be adapted according to the lifting height), and a chain hanging point locking bolt and a screw 315 are installed.

And then, the universal wheel is utilized to move the suspension arm component to be right below the pump shell of the shielding main pump (coarse adjustment is needed). And adjusting the height and levelness of the suspension arm by adjusting the two-way bolt of the temporary suspension arm component supporting piece 38, connecting and assembling the suspension arm component and a chain hung on the fixed mounting component, and mounting a chain anti-springing plate.

The servo motors and the control system thereof are powered on, control buttons of the servo motors in the control system are pressed simultaneously (each servo motor corresponds to one control button and can be lifted synchronously or singly), and when the suspension arm assembly lifts the shielding main pump case shielding blocking plate, the suspension arm assembly is mounted and fastened through a lead screw by a fixing nut of the lead screw 315 for fixing the suspension arm assembly, and at the moment, the suspension arm assembly and the shielding blocking plate are fixed on the pump case 31.

The main bolt hole cleaning and checking assembly comprises two fixing nuts 41, two connecting screw rods 42, a supporting platform 43, a lifting mechanism and a cleaning mechanism; the two connecting screw rods 42 are connected to a main bolt hole 44 through the fixing nuts 41, the supporting platform 43 is connected to the lower portions of the two connecting screw rods 42, the lifting mechanism is arranged on the supporting platform 43, and the cleaning mechanism is arranged on the lifting mechanism.

Wherein, elevating system includes worm gear drive assembly and sprocket lifting unit. The lifting mechanism is driven by a worm gear and a worm, and is lifted by a chain wheel and a chain, so that the lifting mechanism is stable and reliable. The worm and gear transmission assembly comprises a hand wheel 451, a rotating shaft connected with the hand wheel 451, a worm wheel arranged at one end of the rotating shaft, and a worm 452 connected with the worm wheel in a matching manner. The worm gear is manual, and maintenance personal is more convenient to control the elevating position of the cleaning mechanism when cleaning. The sprocket lifting assembly includes brackets 461 disposed at both ends of the worm, sprockets 462 disposed at both ends of the worm 452 and at upper ends of the brackets 461 at both sides, and a chain 463 connecting the upper and lower sprockets 462.

In addition, the cleaning mechanism is fixedly connected to the chains 463 at both sides. Cleaning mechanism includes lift platform 471, locates belt cleaning device 472 on lift platform 471, the belt cleaning device upper end is equipped with cleaning head 4721, the outside parcel of cleaning head 4721 has the cleaning member, cleaning head 4721's diameter is less than the internal diameter of king bolt hole 44, belt cleaning device 472 bottom is equipped with air supply interface and cleaner interface. Cleaning mechanism is mainly through spraying the cleaner to the main bolt downthehole earlier, then blows off cleaner and the filth that washs down through highly-compressed air, and the cleaning member of the outside parcel of cleaning head can improve the clean efficiency to the main bolt hole internal thread when it stretches out and draws back in the main bolt hole simultaneously. The cleaning piece is a soft brush or a scouring pad and the like. The cleaning piece can be used alternately, such as firstly brushing off dirt attached in the threads through a soft brush, and then replacing a scouring pad for wiping so as to remove cleaning agent and dirt. A protective cover 4722 is arranged below the cleaning head 4721, and a drainage port is arranged on the protective cover 4722. The protective cover is mainly used for receiving cleaning agents and dirt blown out from the main bolt hole so as to prevent the cleaning agents and the dirt from splashing and then discharging the cleaning agents and the dirt through the dredging and discharging interface.

It should be further noted that the fixing nut 41 is a nut with both internal and external threads, the external thread is used for connecting with the main bolt hole, the internal thread is used for connecting with the lead screw, and the end face of the fixing nut 41 is provided with the handle 411. The handle is more convenient for the installation and the disassembly operation of the maintainer. And supporting platform 43 can carry out spacing fixed through locating its upper and lower both sides and connecting in two adjusting nut 48 of lead screw, can also adjust supporting platform's height simultaneously to ensure that wiper mechanism's stroke can cover whole main bolt hole, guarantee the cleaning performance.

The use principle of the main bolt hole cleaning and checking assembly is as follows:

1. according to the main bolt hole to be cleaned, fixing nuts are arranged at the main bolt holes on the two sides of the main bolt hole;

2. a connecting screw rod is arranged at the two fixing nuts;

3. a supporting platform and a lifting mechanism are arranged at the lower parts of the two connecting screw rods, and the height of the supporting platform is adjusted;

4. installing a cleaning mechanism, connecting an air source interface to a compressed air pipeline, and connecting a cleaning interface to a cleaning agent tank;

5. after spraying the cleaning agent, opening a compressed air pipeline;

6. lifting movement of the cleaning mechanism is carried out through a hand wheel, cleaning of the main bolt hole is carried out, and the cleaning piece is replaced according to needs in the period;

7. after the washing finishes, open the protection casing and dredge the interface, carry out the waste liquid and dredge, demolish this device, wash other king-bolt holes with the same mode.

The main bolt pneumatic dismounting assembly comprises a main bolt hoisting assembly and a main bolt lifting assembly, the main bolt hoisting assembly comprises a lifting lug 511, a pulley 512 arranged at the lower end of the lifting lug 511, a universal lifting eye bolt 513, a winch 514 and a steel wire rope connected with the universal lifting eye bolt 513 and the winch 514 through the pulley 512, and the upper end of the lifting lug 511 is provided with an external thread matched with a threaded hole of the pump shell 54; the main bolt lifting assembly comprises a supporting frame 521 arranged on a main flange 53, two guide rods 522 arranged below the main flange 53 and connected with the supporting frame 521, a cylinder fixing plate 523 arranged at the lower ends of the two guide rods 522, a sliding connecting plate 524 connected to the two guide rods 522 in a sliding manner, a main bolt rotary joint 525 arranged on the sliding connecting plate 524, and a cylinder 526 arranged below the cylinder fixing plate 523, wherein the output end of the cylinder 526 penetrates through the cylinder fixing plate 523 and is connected to the sliding connecting plate 524, and the main bolt rotary joint 515 is provided with an inner hexagonal sleeve matched with a main bolt.

Specifically, the support frame 521 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 527 is arranged at the upper part of the support frame 521, and a positioning arc 528 matched with the main flange hole is arranged in the middle of one side of the positioning plate 527. 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 521 is provided with a connecting pin 529, and the upper ends of the two guide rods 522 are provided with connecting pieces 5210 which are matched with the connecting pin 529. 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 connecting member 210 is embodied as an arc-shaped piece to avoid interference with the main flange hole. The lower end of the supporting frame 521 is also provided with a supporting frame jacking component 5211. 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 arranged between the sliding connection plate 524 and the main bolt rotary joint 525. 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 526 is connected with a cylinder control system which comprises two speed regulating valves 551, a pneumatic position retaining valve 552, an emergency stop button 553, an emergency stop button silencer 554, two joints 555, a shuttle valve 556 and a pneumatic control box 557; the rodless cavity and the rod cavity of the air cylinder are respectively connected with a speed regulating valve 551, the two speed regulating valves 551 are respectively connected with a pneumatic position retaining valve 552, the pneumatic position retaining valve 552 is connected with an emergency stop button 553, the emergency stop button 553 is connected with a shuttle valve 556, two ends of the shuttle valve 556 are respectively connected with a pneumatic control tank 557 through a connector 555, and the pneumatic position retaining valve 552 is also connected with the two connectors 555. 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 air control box 557 in the cylinder control system comprises an air source inlet pipe 5571, a water droplet separator 5572, a residual pressure release valve 5573, an air filter 5574, a pressure reducing valve 5575, a pressure gauge 5576, an air tank 5577, a precision pressure reducing valve 5578, a pressure switch 5579 and a manual valve 55710 which are sequentially connected, wherein the water droplet separator 5572, the air filter 5574 and the air tank 5577 are connected with a water collecting tank 55711. 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.

The use method of the main bolt pneumatic dismounting assembly comprises the following steps:

step 1, screwing the lifting lug 511 into a threaded hole of the pump shell 54, screwing the universal lifting eye bolt 513 into a threaded hole of the main bolt 56, and then pulling the steel wire rope through the winch 514 so as to lift the main bolt 56 upwards through the main flange hole to be close to the lifting lug 511;

step 2, mounting the main bolt lifting assembly on the main flange 53, and slowly lifting the sliding connecting plate 524 and the main bolt rotary joint 525 through the air cylinder 526 until the main bolt 56 is sleeved in the inner hexagonal sleeve of the main bolt rotary joint 525;

step 3, dismantling the universal lifting bolt 513, the lifting lug 511 and the winch 514;

step 4, slightly lifting the sliding connection plate 524 manually to enable the main bolt 56 to ascend slowly until the main bolt 56 contacts with the threaded hole of the pump shell 54;

step 5, slowly lifting the sliding connecting plate 524 and the main bolt rotary joint 525 through the air cylinder 526, and simultaneously screwing the main bolt rotary joint 525 until the main bolt 56 is completely screwed into the threaded hole of the pump shell 54;

step 6, slowly dropping the sliding connecting plate 524 and the main bolt rotary joint 525 through the air cylinder 526, and measuring and confirming that the main bolt is installed to a proper position;

and 7, enabling the sliding connection plate 524 and the main bolt rotary joint 525 to fall back to the initial position through the air cylinder 526, then closing the air source, and dismantling the main bolt lifting assembly.

step 1, mounting the biological shielding component and the C-shaped sealing ring back chipping component on a pump shell 62 by utilizing the biological shielding blocking plate lifting component;

step 13, adjusting and measuring the elongation of 24 main bolts;

step 14, the EHE 61 and accessories for shielding the main pump are installed.

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

1. A large-scale shielding main pump integral reloading device in radioactive environment comprises a biological shielding component, a C-shaped sealing ring back chipping component, a biological shielding blocking plate lifting component, a main bolt hole cleaning and checking component and a main bolt pneumatic dismounting component, and is characterized in that,

the biological shielding component comprises a biological shielding blocking plate and a blocking plate support, the biological shielding blocking plate is supported above the blocking plate support, the blocking plate support is a remote control self-winding blocking plate support, and the assembly and disassembly of the biological shielding blocking plate and the pump shell are realized by remotely controlling the position and the posture of the blocking plate support on which the biological shielding blocking plate is supported; the biological shielding blocking plate comprises two concentrically superposed circular truncated cones and a mandrel arranged at the centers of the two circular truncated cones;

the C-shaped sealing ring back chipping assembly comprises a suspension arm, a main shaft moving ring and a shielding plate; the main shaft rotating ring is arranged between the shielding plate and the suspension arm; the main shaft rotating ring is rotationally connected with the suspension arm and the shielding plate; a turning tool is arranged on the main shaft moving ring; a fixed shaft is further arranged between the main shaft moving ring and the shielding plate, and the main shaft moving ring is sleeved on the fixed shaft; the two sides of the main shaft rotating ring are symmetrically provided with a cutter frame rod and a cutter frame rod balance weight; one end of the cutter frame rod is connected with the main shaft moving ring, and the other end of the cutter frame rod is connected with the turning tool; a tool rest and a tool feeding device are further arranged at one end of the tool rest rod, which is far away from the main shaft rotating ring; the turning tool is connected with the tool rest rod through the tool rest; the feed device corresponds to the turning tool;

the biological shielding closure plate lifting assembly comprises a suspension arm assembly and a fixed mounting assembly; the suspension arm assembly comprises a plurality of suspension arms and chain lifting mechanisms arranged in each suspension arm; the chain lifting mechanism is connected with a chain hanging point of a fixed mounting assembly mounted on the pump shell through one end of a chain in the chain lifting mechanism, and the other end of the chain is used for being connected with the shielding blocking plate; the fixed mounting assembly is used for being mounted on a pump shell in advance, and the suspension arm assembly and the shielding blocking plate are fixed on the pump shell after the chain lifting mechanism lifts the shielding blocking plate in place; the fixed mounting assembly comprises a special-shaped bolt, an intermediate connecting piece, a screw rod and a chain hanging point; the special-shaped bolt is arranged on the pump shell in advance, one end of the middle connecting piece is connected with the special-shaped bolt, and the other end of the middle connecting piece is connected with the lead screw and the chain hanging point; the screw rod is used for fixing the chain lifting mechanism and the shielding blocking plate on the pump shell; the chain lifting mechanism comprises a chain wheel set, a chain, a servo motor and a speed reducer; one end of the chain extends out of one side of the suspension arm to be connected with a chain hanging point, and the chain extends out of the opposite side of the suspension arm through a chain wheel group in the suspension arm to be connected with a shielding blocking plate;

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; a positioning plate is arranged at the upper part of the support frame, and a positioning arc matched with the main flange hole is arranged in the middle of one side of the positioning plate; the lower end of the support frame is provided with a connecting pin, and the upper ends of the two guide rods are provided with connecting pieces matched with the connecting pin.

2. The integral reloading process of the large-scale shielding main pump in the radioactive environment, which adopts the integral reloading device of the large-scale shielding main pump in the radioactive environment as claimed in claim 1, is characterized by comprising the following steps:

step 13, adjusting and measuring the elongation of 24 main bolts;