CN112045400A - Large-scale shielding main pump main bolt stretching device and stretching method - Google Patents
Large-scale shielding main pump main bolt stretching device and stretching method Download PDFInfo
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- CN112045400A CN112045400A CN202010881956.2A CN202010881956A CN112045400A CN 112045400 A CN112045400 A CN 112045400A CN 202010881956 A CN202010881956 A CN 202010881956A CN 112045400 A CN112045400 A CN 112045400A
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- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
- B23P19/06—Screw or nut setting or loosening machines
- B23P19/067—Bolt tensioners
Abstract
The invention relates to the technical field of maintenance of a nuclear power station shielding main pump, in particular to a large shielding main pump main bolt stretching device and a stretching method. A large-scale shielding main pump main bolt stretching device comprises a stretching mechanism, a stretching mechanism dismounting assembly and a pneumatic control system; the stretching mechanism comprises a piston cylinder; the bridge is connected with the axial bottom end of the piston cylinder, and the bottom of the bridge is provided with an open slot; the axial bottom end of the stretching rod is provided with a threaded connecting hole facing the open slot, and the axial top end of the stretching rod is provided with a limiting installation groove; the piston is arranged in the piston cylinder and is sleeved with the stretching rod; and one pipe orifice is connected with the hydraulic pump through a high-pressure hose, and the other pipe orifice is communicated with the cavity of the piston cylinder. The main bolt stretching device and the stretching method can safely, reliably and conveniently achieve the stretching and fastening function of the main bolt of the shielding main pump, shorten the installation time of the shielding main pump, ensure the quick response under the condition of the fault of the shielding main pump, and shorten the unplanned shutdown time of the nuclear power plant.
Description
Technical Field
The invention relates to the technical field of maintenance of a nuclear power station shielding main pump, in particular to a large shielding main pump main bolt stretching device and a stretching method.
Background
A pump shell of a shielding type reactor coolant pump (hereinafter referred to as a shielding main pump) is welded on a bottom head of a steam generator, the shielding main pump is inversely arranged on the pump shell through 24 main bolts, the main bolts are fastened by hot stretching through a main bolt heater, and the integral installation of the shielding main pump relates to the repeated hot stretching work of the main bolts. Through the comprehensive analysis of the evaporator compartment field condition, the connection mode of the shielding main pump and the pump shell and the hot stretching process of the main bolt of the shielding main pump, the hot stretching process of the main bolt has the following problems:
1. the required time is longer: during the assembly and disassembly of the shielding main pump, the main bolt is heated at least 13 groups of times (wherein the main pump is heated 8 groups of times in the assembly stage and is heated 5 groups of times in the disassembly stage), and the cooling time of each group of times is calculated according to 16 hours, and the total time is 208 hours. If the elongation of the hot-tightened main bolt does not meet the requirement, the main bolt needs to be heated and adjusted again, and the elongation is confirmed after cooling, so that the required time is increased. Although the cooling after the main bolt is heated is accelerated by adopting a continuous blowing mode of a fan on site, a part of the heating section of the main bolt is assembled in the main flange, the part cannot be directly cooled, and a remarkable cooling effect is difficult to obtain. The time required by the main bolt heating and fastening process is long, so that the major repair critical path or the unplanned shutdown time is influenced, the design life of the nuclear power generating unit is considered in 60 years, and the influence on the economic benefit of a nuclear power plant is large.
2. The elongation of the main bolt is not easy to control: due to the fact that the heating rods of the bolt heater are different in quality and different in operation method of operators, the extension amount of the main bolts is not easy to control due to factors such as influences of each group of main bolts on other main bolts and the main flange after heating, and the like, the pre-tightening force of each main bolt possibly has a certain difference and can meet the requirement only by repeatedly adjusting the extension amount of the main bolt.
To sum up, shielding main pump kingbolt adopts the hot compact mode of bolt heater to carry out the dismouting, has kingbolt dismouting process long-consuming time, defects such as difficult control. Therefore, the existing stretching device and stretching process for fastening the main bolt of the shielded main pump need to be improved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a large-scale shielding main pump main bolt stretching device and a stretching method which can shorten the assembling and disassembling time of a shielding main pump and ensure quick response under the condition of main pump failure.
The technical scheme adopted by the invention for solving the technical problems is as follows: a large-scale shielding main pump main bolt stretching device comprises a stretching mechanism, a stretching mechanism dismounting assembly and a pneumatic control system;
the stretching mechanism comprises
A piston cylinder;
the bridge is connected with the axial bottom end of the piston cylinder, and the bottom of the bridge is provided with an open slot;
the axial bottom end of the stretching rod is provided with a threaded connecting hole facing the open slot, and the axial top end of the stretching rod is provided with a limiting installation groove;
the piston is arranged in the piston cylinder and is sleeved with the stretching rod;
one pipe orifice is connected with the hydraulic pump through a high-pressure hose, and the other pipe orifice is communicated with the cavity of the piston cylinder;
one pipe orifice of the oil return pipe is connected with the hydraulic pump through a high-pressure hose, and the other pipe orifice of the oil return pipe is communicated with the cavity of the piston cylinder;
the assembly and disassembly assembly of the stretching mechanism comprises
The stretching mechanism bracket is used for mounting the stretching mechanism;
the lifting component is used for driving the stretching mechanism bracket to move up and down;
the supporting component is used for connecting the lifting component and the shielding main pump;
the pneumatic control system comprises
The cylinder control system is used for controlling the lifting component to lift;
and the air control box control system is used for providing the compressed air for the plant.
Adopt the kingbolt stretching device of this application, shielding main pump is whole to be changed the period, and the tensile fastening of kingbolt or dismantle the operation 13 groups of times in total (wherein the tensile 8 groups of times in main pump installation stage, the tensile 5 groups of times in main pump dismantlement stage), go on according to every group 1 hour of time, need 13 hours altogether. The total replacement period of the main pump is shortened for 195 hours, so that the time of a critical path is effectively shortened, and the influence on the time of the critical path of a power plant or the unplanned shutdown time is minimized. In addition, the stretching mode of the main bolt stretching device is not influenced by bolt lubrication effect and thread friction force, more accurate bolt load can be obtained, the pressure of 8 bolt stretching devices is provided by connecting 1 hydraulic pump in series through 8 hydraulic oil pipes, the tension born by each bolt is uniform, the elongation of the main bolt is less influenced by adverse factors, and therefore the elongation of the main bolt is very easy to control.
Preferably, the piston cylinder comprises a primary piston cylinder and a secondary piston cylinder, and the piston comprises a primary piston matched with the primary piston cylinder and a secondary piston matched with the secondary piston cylinder.
Preferably, the lifting member includes
A guide bar;
the cylinder comprises a telescopic rod;
the two ends of the lower connecting plate are connected with the axial bottom end of the guide rod, the middle of the lower connecting plate is connected with the top of the shell of the air cylinder, and a through hole allowing the free end of the telescopic rod to penetrate is formed in the lower connecting plate;
the two ends of the guide support plate are provided with guide holes in sliding connection with the guide rods, and the middle of the guide support plate is provided with a bull eye bearing, wherein the bull eye bearing comprises a dynamic bearing part and a static bearing part which is in contact with the free end of the telescopic rod;
the bottom of the stretching mechanism bracket is connected with a movable bearing part of the bull eye bearing;
the support member comprises
The upper connecting plate is sleeved with the main bolt and is provided with a through hole allowing the pre-stretched main nut to pass through, connecting holes which are positioned on two radial sides of the through hole and detachably connected with the axial top end of the guide rod, and assembling holes which are assembled and connected with the main nuts on two sides of the pre-stretched main nut;
and the locking nut is connected with the main bolt and is arranged below the assembling hole of the upper connecting plate.
Preferably, the pneumatic control box control system comprises
The inlet of the water drop separator is connected with the gas source inlet pipe;
a residual pressure release valve, an inlet of which is connected with an outlet of the water droplet separator;
an air filter having an inlet connected to an outlet of the residual pressure relief valve;
a pressure reducing valve, an inlet of which is connected with an outlet of the air filter;
a gas tank, an inlet of which is connected with an outlet of the pressure reducing valve;
the pressure gauge is arranged on a pipeline between the pressure reducing valve and the gas tank;
a precision pressure reducing valve, an inlet of which is connected with an outlet of the gas tank;
the inlet of the manual valve is connected with the outlet of the precision pressure reducing valve, and the outlet of the manual valve is connected with the air supply flow channel;
the pressure switch is arranged on a pipeline between the precision pressure reducing valve and the manual valve;
and the water collecting tank is connected with the water drop separator, the air filter and the bottom of the air tank.
Preferably, the cylinder control system comprises
The shuttle valve comprises a left air inlet connected with the air supply flow passage through a left air inlet pipe and a right air inlet connected with the air supply flow passage through a right air inlet pipe;
the inlet of the emergency stop button is connected with the air outlet of the shuttle valve;
the inlet of the pneumatic position-keeping valve is connected with the outlet of the emergency stop button;
the inlet of the first speed regulating valve is connected with the first outlet of the pneumatic position retaining valve, and the outlet of the first speed regulating valve is connected with the rodless cavity of the cylinder;
the inlet of the second speed regulating valve is connected with the second outlet of the pneumatic position retaining valve, and the outlet of the second speed regulating valve is connected with the rod cavity of the cylinder;
the emergency stop button silencer is connected with the emergency stop button;
the outlet three-way cross joint of the pneumatic position-keeping valve is connected with the left air inlet pipe, and the outlet four-way cross joint of the pneumatic position-keeping valve is connected with the right air inlet pipe.
A method for stretching a main bolt of a large shielding main pump comprises the following steps
S01, mounting a main bolt into a pump shell threaded hole of the shielding main pump and connecting a main nut to a fastening torque value;
s02 measuring and recording the initial length of the main bolt using the bolt elongation measuring tool;
s03, connecting the stretching mechanism with a main bolt to be stretched through the stretching mechanism dismounting assembly, and dismounting the stretching mechanism dismounting assembly after resetting;
s04, connecting the stretching mechanism with the hydraulic pump through a high-pressure hose and setting an initial oil pressure value;
s05 starting the hydraulic pump to a target oil pressure value, simultaneously measuring the real-time length of the main bolt in a pressure maintaining state by using a bolt elongation measuring tool, and when the bolt elongation reaches a preset value, closing the hydraulic pump to stop the stretching operation and fastening the main nut;
s06, detaching the stretching mechanism and the stretched main bolt;
s07 repeats steps S03 to S06 until all 24 kingbolts are stretched.
Preferably, S03 specifically includes
S31, connecting the tension mechanism dismounting assembly with the shielding main pump;
s32, connecting the stretching mechanism dismounting assembly with the air cylinder control system, connecting the air cylinder control system with the air control box control system, and connecting the air control box control system with the air source;
s33, connecting the stretching mechanism with the stretching mechanism dismounting component;
s34, controlling the stretching mechanism to ascend until the threaded connecting hole of the stretching mechanism is contacted with the threads of the main bolt through the cylinder control system and the stretching mechanism dismounting assembly;
s35, lifting the guide supporting plate edge upwards to rotate the stretching mechanism until the main bolt is screwed into the threaded connecting hole of the stretching mechanism;
s36 lowering the guide support plate to contact with the free end of the telescopic rod to separate the stretching mechanism bracket from the stretching mechanism.
Preferably, the S31 specifically includes sleeving the fitting holes of the upper connecting plate on the main bolts at both sides of the pre-tensioned main nut, allowing the pre-tensioned main nut to pass through the holes, and connecting the lock nut to the main bolts at both sides of the pre-tensioned main nut;
connecting the axial top end of a guide rod of the lifting component with a connecting hole of the upper connecting plate;
the bottom of the stretching mechanism bracket is connected with a bull eye bearing of a guide support plate of the lifting component.
Preferably, the air supply process of the air control box control system in S32 is specifically that the air control box control system reduces the pressure of the plant compressed air to 0.50 MPa through the water droplet separator, the residual pressure release valve, the air filter and the pressure reducing valve in sequence, stores the plant compressed air in the air tank, reduces the pressure of the plant compressed air to 0.35 MPa through the precision pressure reducing valve, and then delivers the plant compressed air to the air supply flow channel through the manual valve.
Preferably, in the lifting control process of the cylinder control system in S03, when the guide support plate of the assembly and disassembly assembly of the stretching mechanism needs to be lifted, the cylinder control system conveys the gas in the gas supply flow passage to the rodless cavity of the cylinder after sequentially passing through the left side of the shuttle valve, the emergency stop button, the pneumatic position-keeping valve and the first speed regulating valve; when the guide support plate of the assembly and disassembly component of the stretching mechanism needs to fall, the air cylinder control system conveys air in the air supply channel to a rod cavity of the air cylinder after sequentially passing through the right side of the shuttle valve, the emergency stop button, the pneumatic position-keeping valve and the second speed regulating valve.
Advantageous effects
The main bolt stretching device and the stretching method can safely, reliably and conveniently achieve the stretching and fastening function of the main bolt of the shielding main pump, shorten the installation time of the shielding main pump, and ensure the quick response under the condition of the fault of the shielding main pump, thereby shortening the unplanned shutdown time of the nuclear power plant, and reducing the economic impact on the nuclear power plant caused by the fault of the shielding main pump.
Drawings
FIG. 1 is a schematic structural view of a stretching mechanism of the present application;
FIG. 2 is a schematic view of a connection structure between a tension mechanism mounting/dismounting assembly and a shielding main pump according to a first embodiment of the present disclosure;
FIG. 3 is a schematic view of a connection structure between a mounting/dismounting assembly of a stretching mechanism and a shielding main pump according to a second embodiment of the present invention;
FIG. 4 is a schematic view of a connection structure between a tension mechanism dismounting assembly and a shielding main pump according to a third embodiment of the present application;
FIG. 5 is a schematic structural view of a mounting/dismounting assembly of the stretching mechanism of the present application;
FIG. 6 is a schematic structural diagram of a pneumatic control box control system of the present application;
fig. 7 is a schematic structural diagram of the cylinder control system of the present application.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
A large-scale shielding main pump main bolt stretching device comprises a stretching mechanism, a stretching mechanism dismounting assembly and a pneumatic control system.
As shown in fig. 1, the stretching mechanism includes a piston cylinder, a bridge 58, a stretching rod 57, a piston, an oil inlet pipe 51 and an oil return pipe 52. The bridge frame 58 is connected with the axial bottom end of the piston cylinder, and an open slot is formed in the bottom of the bridge frame. The axial bottom end of the stretching rod 57 is provided with a threaded connection hole facing the open slot, and the axial top end is provided with a limit mounting groove. The piston is arranged in the piston cylinder and is sleeved with the stretching rod 57. One pipe orifice of the oil inlet pipe 51 is connected with the hydraulic pump through a high-pressure hose, and the other pipe orifice is communicated with the cavity of the piston cylinder. One pipe orifice of the oil return pipe 52 is connected with the hydraulic pump through a high-pressure hose, and the other pipe orifice is communicated with the cavity of the piston cylinder. The hydraulic pump power source, the tensile mechanism is the actuator.
The piston cylinder comprises a first-stage piston cylinder 54 and a second-stage piston cylinder 56, and the piston comprises a first-stage piston 53 matched with the first-stage piston cylinder 54 and a second-stage piston 55 matched with the second-stage piston cylinder 56. The stretching mechanism adopts a two-stage piston design mode, the action area of the piston is increased, and the action load of the stretching mechanism is increased under the condition that the pressure of the piston cylinder is certain, so that the purpose of reducing the outer diameter size of the stretching mechanism is achieved.
As shown in fig. 2 to 5, the drawing mechanism dismounting assembly includes a drawing mechanism bracket 5 for mounting the drawing mechanism, a lifting member 7 for driving the drawing mechanism bracket 5 to move up and down, and a supporting member for connecting the lifting member 7 and the shield main pump. The support component fixes the dismounting assembly on the main shielding pump main bolt 4 through the upper connecting plate 2 and the locking nut 3, and provides support for the dismounting assembly.
Lifting unit 7 includes guide bar 72, including the cylinder 74 of telescopic link, both ends with the casing top of guide bar 72 is connected, the centre is connected and is equipped with the permission with cylinder 74 to the axial bottom the perforated lower junction plate 73 that the telescopic link free end passed, both ends be equipped with guide bar 72 sliding connection's guiding hole, centre are equipped with the direction backup pad 71 of bull's eye bearing, the bull's eye bearing including dynamic bearing portion and with the quiet bearing portion of telescopic link free end contact. The on-site factory compressed air is used as a gas pressure supply source, and meanwhile, the selected air cylinder 74 meets the requirements of small mass and convenient transportation as far as possible under the condition that the requirements of the dismounting and mounting stroke of the main bolt stretching mechanism are met. Because the main bolt stretching mechanism is reversely assembled and disassembled, the air inlet pressure of the air cylinder needs to be set before the main bolt stretching mechanism is screwed into the main bolt 4, the weight of the main bolt stretching mechanism is further eliminated, and the safe and reliable assembly and disassembly of the main bolt stretching mechanism are realized. The middle of the guide supporting plate 71 is provided with a bull's eye bearing which is matched with the stretching mechanism bracket 5 for use, and the guide supporting plate has an automatic centering function. The two ends of the guide support plate 71 are provided with mechanical self-locking functions for realizing the self-locking safety function in emergency.
The bottom of the stretching mechanism bracket 5 is connected with a movable bearing part of the bull eye bearing.
The support member includes an upper connecting plate 2 and a lock nut 3. The upper connecting plate 2 is sleeved with the main bolt 4 and is provided with a through hole allowing the pre-stretched main nut 1 to pass through, connecting holes located on two radial sides of the through hole and detachably connected with the axial top end of the guide rod 72, and assembling holes for assembling and connecting the main nuts 1 on two sides of the pre-stretched main nut 1. And the locking nut 3 is connected with the main bolt 4 and is arranged below the assembling hole of the upper connecting plate 2. The assembly and disassembly components of the stretching mechanism totally comprise 3 working conditions: all the adjacent main bolts are installed (see fig. 2), no main bolt is installed on one adjacent side (see fig. 3), and no main bolt is installed on two adjacent sides (see fig. 4). According to the service environment of the assembly and disassembly components of the stretching mechanism, the upper connecting plates 2 of three different models are developed, and the assembly and disassembly components are fixed on the main bolt 4 of the shielding main pump through the upper connecting plates 2 and the locking nuts 3 to provide support for the assembly and disassembly components.
The pneumatic control system comprises a cylinder control system for controlling the lifting component 7 to perform lifting operation and a pneumatic control box control system 9 for providing factory compressed air.
As shown in fig. 6, the pneumatic tank control system 9 includes a water droplet separator 92 having an inlet connected to an air source inlet pipe 91, a residual pressure release valve 93 having an inlet connected to an outlet of the water droplet separator 92, an air filter 94 having an inlet connected to an outlet of the residual pressure release valve 93, a pressure reducing valve 95 having an inlet connected to an outlet of the air filter 94, an air tank 97 having an inlet connected to an outlet of the pressure reducing valve 95, a pressure gauge 96 provided on a pipe between the pressure reducing valve 95 and the air tank 97, a fine pressure reducing valve 98 having an inlet connected to an outlet of the air tank 97, a manual valve 910 having an inlet connected to an outlet of the fine pressure reducing valve 98 and an outlet connected to an air supply flow passage, and a pressure switch 99 provided on a pipe between the fine pressure reducing valve 98 and the manual valve 910, and a water collection tank 911 connected to the water droplet separator 92, the air filter 94, and the bottom of the air tank 97.
As shown in FIG. 7, the cylinder control system includes a shuttle valve 87, an emergency stop button 84, a pneumatic hold valve 83, a first speed valve 821, a second speed valve 822, and an emergency stop button muffler 85. The shuttle valve 87 comprises a left air inlet connected with the air supply flow passage through a left air inlet pipe and a right air inlet connected with the air supply flow passage through a right air inlet pipe, an inlet of an emergency stop button 84 is connected with an air outlet of the shuttle valve 87, an inlet of a pneumatic position-keeping valve 83 is connected with an outlet of the emergency stop button 84, an inlet of a first speed regulating valve 821 is connected with a first outlet of the pneumatic position-keeping valve 83, an outlet of the first speed regulating valve is connected with a rodless cavity of the air cylinder 74, an inlet of a second speed regulating valve 822 is connected with a second outlet of the pneumatic position-keeping valve 83, an outlet of the second speed regulating valve is connected with a rod cavity of the air cylinder 74, an emergency stop button silencer 85 is connected with the emergency stop button 84, an outlet three-way adapter 86 of the pneumatic position-keeping valve 83 is connected with the left air inlet pipe, and an outlet four-way adapter 86 of.
Adopt the kingbolt stretching device of this application, shielding main pump is whole to be changed the period, and the tensile fastening of kingbolt or dismantle the operation 13 groups of times in total (wherein the tensile 8 groups of times in main pump installation stage, the tensile 5 groups of times in main pump dismantlement stage), go on according to every group 1 hour of time, need 13 hours altogether. The total replacement period of the main pump is shortened for 195 hours, so that the time of a critical path is effectively shortened, and the influence on the time of the critical path of a power plant or the unplanned shutdown time is minimized. In addition, the stretching mode of the main bolt stretching device is not influenced by bolt lubrication effect and thread friction force, more accurate bolt load can be obtained, the pressure of 8 bolt stretching devices is provided by connecting 1 hydraulic pump in series through 8 hydraulic oil pipes, the tension born by each bolt is uniform, and the elongation of the main bolt is less influenced by adverse factors.
A method for stretching a main bolt of a large shielding main pump comprises the following steps
S01 mounting the main bolt 4 into a pump case threaded hole of the canned main pump and connecting the main nut 1 to a tightening torque value, 644 Nm in this case.
S02 measures and records the initial length of the main bolt 4 using the bolt elongation measuring tool.
S03, connecting the stretching mechanism with the main bolt 4 to be stretched through the stretching mechanism dismounting assembly, and dismounting the stretching mechanism dismounting assembly after resetting. The step S03 specifically comprises the step S31 of connecting the stretching mechanism dismounting component with the shielding main pump; s32, connecting the stretching mechanism dismounting assembly with the air cylinder control system, connecting the air cylinder control system with the air control box control system, and connecting the air control box control system with the air source; s33, connecting the stretching mechanism with the stretching mechanism dismounting component; s34, controlling the stretching mechanism to ascend until the threaded connecting hole of the stretching mechanism is contacted with the threads of the main bolt 4 through the cylinder control system and the stretching mechanism dismounting assembly; s35, lifting the guide support plate 71 upwards and rotating the stretching mechanism until the main bolt 4 is screwed into the threaded connecting hole of the stretching mechanism; s36 lowers the guide support plate 71 into contact with the free end of the telescopic rod to disengage the stretching mechanism bracket 5 from the stretching mechanism.
The step S31 specifically comprises the steps of sleeving the assembly holes of the upper connecting plate 2 on the main bolts 4 on the two sides of the pre-stretched main nut 1, enabling the pre-stretched main nut 1 to be aligned with the through holes to penetrate through the through holes, and connecting the locking nut 3 with the main bolts 4 on the two sides of the pre-stretched main nut 1; connecting the axial top end of the guide rod 72 of the lifting component 7 with the connecting hole of the upper connecting plate 2; the bottom of the tension mechanism bracket 5 is connected to the bull's eye bearing of the guide support plate 71 of the elevating member 7.
The air supply process of the air control box control system in the S32 is specifically that the air control box control system 9 reduces the pressure of the plant compressed air to 0.50 MPa through the water droplet separator 92, the residual pressure release valve 93, the air filter 94 and the pressure reducing valve 95 in sequence, stores the plant compressed air in the air tank 97, reduces the pressure of the plant compressed air to 0.35 MPa through the precision pressure reducing valve 98, and then delivers the plant compressed air to the air supply flow passage through the manual valve 910.
Residual pressure relief valve 93, model number VHS30-03AH-BS, is used to relieve the residual pressure of the system. The pressure reducing valve 95 is of the type AR30-03H-B and is used for reducing the pressure of the plant compressed air to 0.5 MPa. The air tank 97 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 98 is IR3020-03H-A in type, and is used for precisely regulating pressure to reduce the output pressure to 0.35 MPa. The manual valve 910 is provided with a model VH330-03 and is used for controlling the flow direction of gas in the gas control box.
The utility model provides a kingbolt stretching device is according to tension mechanism, tension mechanism bracket 5, the weight of direction backup pad 71, the accurate relief pressure valve 98 setting value of pneumatic control case is 0.35 MPa, can effectively balance kingbolt tension mechanism and tension mechanism bracket 5, the weight of direction backup pad 71, the tension mechanism of the light manual rotation kingbolt in the kingbolt tension mechanism installation, and the cooperation condition of kingbolt 4 can be judged to the rotation kingbolt tension mechanism in-process, the influence that the operator strength size brought has not only been reduced, still can avoid kingbolt tension mechanism and kingbolt complex unsmooth risk.
The lifting control process of the cylinder control system in S03 is specifically that when the guide support plate 71 of the assembly and disassembly component of the stretching mechanism needs to be lifted, the cylinder control system conveys the gas in the gas supply channel to the rodless cavity of the cylinder 74 after passing through the left side of the shuttle valve 87, the emergency stop button 84, the pneumatic position-keeping valve 83 and the first speed regulating valve 821 in sequence; when the guide support plate 71 of the assembly and disassembly component of the stretching mechanism needs to fall down, the air cylinder control system conveys the air in the air supply channel to the rod cavity of the air cylinder 74 after sequentially passing through the right side of the shuttle valve 87, the emergency stop button 84, the pneumatic position-keeping valve 83 and the second speed regulating valve 822.
The model of the shuttle valve 87 is VR1210-01, the valve body of the shuttle valve is combined with the actuator into a whole, the valve body is equivalent to two check valves which are combined together and has the function of 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 model of the emergency stop button 84 is VM430-01-30R-X219 and is used for emergently stopping the cylinder from lifting when unexpected conditions occur in the operation process, and an emergency stop button silencer 85 is arranged on the emergency stop button 84. The pneumatic position-keeping valve 83 is IL211-02, and is a valve position protection device. 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 failure is eliminated, the pneumatic retention valve 83 is immediately returned to the normal position.
S04 is performed by connecting the stretching mechanism to the hydraulic pump through the high-pressure hose and setting the initial oil pressure value.
S05 starts the hydraulic pump to a target oil pressure value while measuring the real-time length of the main bolt 4 in a pressure-maintaining state using the bolt elongation measuring tool, and when the bolt elongation reaches a predetermined value, turns off the hydraulic pump to stop the stretching operation and tighten the main nut 1. The main bolt stretching device applies external force to the end part of the main bolt by using a piston cylinder, after the main bolt 4 is stretched to a required length, the main nut 1 is separated from the contact surface of the main flange, and then the main nut 1 is screwed. After the oil pressure in the bolt stretching mechanism is removed, the original extended bolt retracts, and the main nut 4 is tightly pressed on the joint surface, so that the axial deformation of the main bolt 4 is locked, and the applied load is kept. When the main bolt is stretched, the set oil pressure of the piston cylinder is a display value for controlling load loading, and the stretching essence of the main bolt is to effectively control the elongation of the main bolt by setting the oil pressure, so that the pre-tightening effect of the main bolt is ensured.
S06, the tension mechanism is detached from the main bolt 4 after being tensioned.
S07 repeats steps S03 to S06 until the stretching of 24 kingbolts 4 is completed.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical solutions of the present invention may be made by those skilled in the art without departing from the design concept of the present invention, and the technical contents of the present invention are all described in the claims.
Claims (10)
1. The utility model provides a large-scale shielding main pump kingbolt stretching device which characterized in that: the device comprises a stretching mechanism, a stretching mechanism dismounting component and a pneumatic control system;
the stretching mechanism comprises
A piston cylinder;
the bridge (58) is connected with the axial bottom end of the piston cylinder, and the bottom of the bridge is provided with an open slot;
the axial bottom end of the stretching rod (57) is provided with a threaded connecting hole facing the open slot, and the axial top end of the stretching rod is provided with a limiting installation groove;
the piston is arranged in the piston cylinder and is sleeved with the stretching rod (57);
an oil inlet pipe (51), one pipe orifice is connected with the hydraulic pump through a high-pressure hose, and the other pipe orifice is communicated with the cavity of the piston cylinder;
an oil return pipe (52), one pipe orifice is connected with the hydraulic pump through a high-pressure hose, and the other pipe orifice is communicated with the cavity of the piston cylinder;
the assembly and disassembly assembly of the stretching mechanism comprises
A stretching mechanism bracket (5) for mounting the stretching mechanism;
the lifting component (7) is used for driving the stretching mechanism bracket (5) to move up and down;
a support member for connecting the lifting member (7) with a shield main pump;
the pneumatic control system comprises
The cylinder control system is used for controlling the lifting component (7) to carry out lifting operation;
and the air control box control system (9) is used for providing the compressed air for the plant.
2. The large-scale shielding main pump main bolt stretching device according to claim 1, characterized in that: the piston cylinder comprises a first-stage piston cylinder (54) and a second-stage piston cylinder (56), and the piston comprises a first-stage piston (53) matched with the first-stage piston cylinder (54) and a second-stage piston (55) matched with the second-stage piston cylinder (56).
3. The large-scale shielding main pump main bolt stretching device according to claim 1, characterized in that: the lifting part (7) comprises
A guide rod (72);
a cylinder (74) comprising a telescoping rod;
the two ends of the lower connecting plate (73) are connected with the axial bottom end of the guide rod (72), the middle of the lower connecting plate is connected with the top of the shell of the air cylinder (74), and a through hole allowing the free end of the telescopic rod to pass through is formed in the lower connecting plate;
the two ends of the guide support plate (71) are provided with guide holes in sliding connection with the guide rods (72), and the middle of the guide support plate is provided with a bull eye bearing, wherein the bull eye bearing comprises a dynamic bearing part and a static bearing part which is in contact with the free end of the telescopic rod;
the bottom of the stretching mechanism bracket (5) is connected with a movable bearing part of the bull eye bearing;
the support member comprises
The upper connecting plate (2) is sleeved with the main bolt (4) and is provided with a through hole allowing the pre-stretched main nut (1) to pass through, connecting holes which are positioned on two radial sides of the through hole and detachably connected with the axial top end of the guide rod (72), and assembling holes which are assembled and connected with the main nuts (1) on two sides of the pre-stretched main nut (1);
and the locking nut (3) is connected with the main bolt (4) and is arranged below the assembling hole of the upper connecting plate (2).
4. The large-scale shielding main pump main bolt stretching device according to claim 1, characterized in that: the pneumatic control box control system (9) comprises
A water droplet separator (92) having an inlet connected to the gas source inlet pipe (91);
a residual pressure release valve (93) having an inlet connected to an outlet of the water droplet separator (92);
an air filter (94) having an inlet connected to an outlet of the residual pressure release valve (93);
a pressure reducing valve (95) having an inlet connected to an outlet of the air filter (94);
a gas tank (97) having an inlet connected to an outlet of the pressure reducing valve (95);
a pressure gauge (96) provided on a pipe between the pressure reducing valve (95) and the gas tank (97);
a precision pressure reducing valve (98) having an inlet connected to an outlet of the gas tank (97);
a manual valve (910), the inlet of which is connected with the outlet of the precision pressure reducing valve (98), and the outlet of which is connected with the air supply flow channel;
the pressure switch (99) is arranged on a pipeline between the precision reducing valve (98) and the manual valve (910);
and a water collection tank (911) connected to the bottoms of the water droplet separator (92), the air filter (94), and the air tank (97).
5. The large-scale shielding main pump main bolt stretching device according to claim 1, characterized in that: the cylinder control system comprises
The shuttle valve (87) comprises a left air inlet connected with the air supply flow passage through a left air inlet pipe and a right air inlet connected with the air supply flow passage through a right air inlet pipe;
an emergency stop button (84) having an inlet connected to an outlet of the shuttle valve (87);
a pneumatic position-keeping valve (83), the inlet of which is connected with the outlet of the emergency stop button (84);
a first speed regulating valve (821), the inlet of which is connected with the first outlet of the pneumatic holding valve (83), and the outlet of which is connected with the rodless cavity of the cylinder (74);
the inlet of the second speed regulating valve (822) is connected with the second outlet of the pneumatic position retaining valve (83), and the outlet of the second speed regulating valve is connected with a rod cavity of the air cylinder (74);
an emergency stop button muffler (85) connected to the emergency stop button (84);
an outlet three-way joint (86) of the pneumatic position-keeping valve (83) is connected with the left air inlet pipe, and an outlet four-way joint (86) of the pneumatic position-keeping valve (83) is connected with the right air inlet pipe.
6. A method for stretching a main bolt of a large-scale shielding main pump is characterized by comprising the following steps: comprises the following steps
S01, mounting a main bolt (4) into a pump shell threaded hole of a shielding main pump and connecting a main nut (1) to a fastening torque value;
s02 measuring and recording the initial length of the main bolt (4) using the bolt elongation measuring tool;
s03, connecting the stretching mechanism with a main bolt (4) to be stretched through the stretching mechanism dismounting assembly, and dismounting the stretching mechanism dismounting assembly after resetting;
s04, connecting the stretching mechanism with the hydraulic pump through a high-pressure hose and setting an initial oil pressure value;
s05 starting the hydraulic pump to a target oil pressure value, simultaneously measuring the real-time length of the main bolt (4) in a pressure maintaining state by using a bolt elongation measuring tool, and when the bolt elongation reaches a preset value, closing the hydraulic pump to stop the stretching operation and fastening the main nut (1);
s06, the stretching mechanism and the stretched main bolt (4) are detached;
s07, repeating the steps S03 to S06 until the 24 main bolts (4) are stretched.
7. The large-scale shielding main pump main bolt stretching method according to claim 6, characterized in that: the S03 specifically comprises
S31, connecting the tension mechanism dismounting assembly with the shielding main pump;
s32, connecting the stretching mechanism dismounting assembly with the air cylinder control system, connecting the air cylinder control system with the air control box control system, and connecting the air control box control system with the air source;
s33, connecting the stretching mechanism with the stretching mechanism dismounting component;
s34, controlling the stretching mechanism to ascend until the threaded connecting hole of the stretching mechanism is contacted with the thread of the main bolt (4) through the cylinder control system and the stretching mechanism dismounting assembly;
s35, lifting the guide support plate (71) upwards while rotating the stretching mechanism until the main bolt (4) is screwed into the threaded connecting hole of the stretching mechanism;
s36, the guide support plate (71) is lowered to contact with the free end of the telescopic rod, so that the stretching mechanism bracket (5) is separated from the stretching mechanism.
8. The large-scale shielding main pump main bolt stretching method according to claim 7, characterized in that: the S31 concretely comprises the steps that assembly holes of an upper connecting plate (2) are sleeved on main bolts (4) on two sides of a pre-stretching main nut (1), the pre-stretching main nut (1) is aligned to a through hole to penetrate through the through hole, and a locking nut (3) is connected with the main bolts (4) on two sides of the pre-stretching main nut (1);
connecting the axial top end of a guide rod (72) of the lifting component (7) with a connecting hole of the upper connecting plate (2);
the bottom of the tension mechanism bracket (5) is connected with a bull's eye bearing of a guide support plate (71) of the lifting component (7).
9. The large-scale shielding main pump main bolt stretching method according to claim 7, characterized in that: the air supply process of the air control box control system in the S32 is specifically that the air control box control system (9) reduces the pressure of the factory compressed air to 0.50 MPa through the water drop separator (92), the residual pressure release valve (93), the air filter (94) and the pressure reducing valve (95) in sequence, stores the factory compressed air in the air tank (97), reduces the pressure of the factory compressed air to 0.35 MPa through the precision pressure reducing valve (98), and then conveys the factory compressed air to the air supply flow channel through the manual valve (910).
10. The large-scale shielding main pump main bolt stretching method according to claim 6, characterized in that: the lifting control process of the cylinder control system in the S03 is specifically that when a guide support plate (71) of a dismounting component of the stretching mechanism needs to be lifted, the cylinder control system conveys gas in a gas supply channel to a rodless cavity of the cylinder (74) after sequentially passing through the left side of a shuttle valve (87), an emergency stop button (84), a pneumatic position-keeping valve (83) and a first speed regulating valve (821); when a guide support plate (71) of the assembly and disassembly component of the stretching mechanism needs to fall down, the air cylinder control system conveys air in an air supply channel to a rod cavity of the air cylinder (74) after sequentially passing through the right side of the shuttle valve (87), the emergency stop button (84), the pneumatic position-keeping valve (83) and the second speed regulating valve (822).
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| CN202010881956.2A CN112045400B (en) | 2020-08-28 | 2020-08-28 | Large-scale shielding main pump main bolt stretching device and stretching method |
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| CN202010881956.2A CN112045400B (en) | 2020-08-28 | 2020-08-28 | Large-scale shielding main pump main bolt stretching device and stretching method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113894533A (en) * | 2021-12-08 | 2022-01-07 | 东方法马通核泵有限责任公司 | Hydraulic stretching quick installation method for main pump main bolt |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004286022A (en) * | 2003-03-20 | 2004-10-14 | Man B & W Diesel As | Device for extending tie rod |
| CN203227995U (en) * | 2013-04-25 | 2013-10-09 | 北京科路工业装备有限公司 | Double-stage hydraulic stretcher |
| WO2017005027A1 (en) * | 2015-07-03 | 2017-01-12 | 成都海光核电技术服务有限公司 | Combined-type integral tensioner for main bolt of reactor pressure vessel and method of use thereof |
| CN107717429A (en) * | 2017-11-09 | 2018-02-23 | 大连泰凯工业有限公司 | Multistage super-pressure thin-walled hydraulic elongator for hub of wind power generator kingbolt |
| CN110509042A (en) * | 2019-08-28 | 2019-11-29 | 三门核电有限公司 | A kind of pneumatically shielding main pump kingbolt dismantling device and assembly and disassembly methods |
| CN210400280U (en) * | 2019-08-29 | 2020-04-24 | 三门核电有限公司 | Device for shielding elongation of main bolt of main pump |
| CN210436071U (en) * | 2019-08-29 | 2020-05-01 | 三门核电有限公司 | Auxiliary device is dismantled to coupler bolt |
| CN211028890U (en) * | 2019-07-24 | 2020-07-17 | 江苏法尔胜缆索有限公司 | Synchronous bolt stretcher |
| CN211162789U (en) * | 2019-09-25 | 2020-08-04 | 浙江易普液压设备有限公司 | Ultrahigh-pressure two-stage stretcher |
-
2020
- 2020-08-28 CN CN202010881956.2A patent/CN112045400B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004286022A (en) * | 2003-03-20 | 2004-10-14 | Man B & W Diesel As | Device for extending tie rod |
| CN203227995U (en) * | 2013-04-25 | 2013-10-09 | 北京科路工业装备有限公司 | Double-stage hydraulic stretcher |
| WO2017005027A1 (en) * | 2015-07-03 | 2017-01-12 | 成都海光核电技术服务有限公司 | Combined-type integral tensioner for main bolt of reactor pressure vessel and method of use thereof |
| CN107717429A (en) * | 2017-11-09 | 2018-02-23 | 大连泰凯工业有限公司 | Multistage super-pressure thin-walled hydraulic elongator for hub of wind power generator kingbolt |
| CN211028890U (en) * | 2019-07-24 | 2020-07-17 | 江苏法尔胜缆索有限公司 | Synchronous bolt stretcher |
| CN110509042A (en) * | 2019-08-28 | 2019-11-29 | 三门核电有限公司 | A kind of pneumatically shielding main pump kingbolt dismantling device and assembly and disassembly methods |
| CN210400280U (en) * | 2019-08-29 | 2020-04-24 | 三门核电有限公司 | Device for shielding elongation of main bolt of main pump |
| CN210436071U (en) * | 2019-08-29 | 2020-05-01 | 三门核电有限公司 | Auxiliary device is dismantled to coupler bolt |
| CN211162789U (en) * | 2019-09-25 | 2020-08-04 | 浙江易普液压设备有限公司 | Ultrahigh-pressure two-stage stretcher |
Non-Patent Citations (2)
| Title |
|---|
| 任世贵等: "船舶轴系液压拉伸螺栓的原理及工艺", 《船舶设计通讯》 * |
| 文小军等: "反应堆压力容器主螺栓拉伸装置设计及有限元分析", 《机械》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113894533A (en) * | 2021-12-08 | 2022-01-07 | 东方法马通核泵有限责任公司 | Hydraulic stretching quick installation method for main pump main bolt |
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| CN112045400B (en) | 2021-08-20 |
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