CN109973758B - Expansion clamping device for heat transfer tube of steam generator - Google Patents
Expansion clamping device for heat transfer tube of steam generator Download PDFInfo
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- CN109973758B CN109973758B CN201711439892.5A CN201711439892A CN109973758B CN 109973758 B CN109973758 B CN 109973758B CN 201711439892 A CN201711439892 A CN 201711439892A CN 109973758 B CN109973758 B CN 109973758B
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- 238000007789 sealing Methods 0.000 claims abstract description 50
- 230000009471 action Effects 0.000 claims description 25
- 238000006073 displacement reaction Methods 0.000 claims description 13
- 238000009434 installation Methods 0.000 claims description 9
- 230000001965 increasing effect Effects 0.000 claims description 7
- 230000007246 mechanism Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 5
- 238000009659 non-destructive testing Methods 0.000 abstract description 2
- 230000008961 swelling Effects 0.000 abstract description 2
- 238000007689 inspection Methods 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011664 nicotinic acid Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
- B23B31/40—Expansion mandrels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/26—Pigs or moles, i.e. devices movable in a pipe or conduit with or without self-contained propulsion means
- F16L55/28—Constructional aspects
- F16L55/40—Constructional aspects of the body
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L2101/00—Uses or applications of pigs or moles
- F16L2101/30—Inspecting, measuring or testing
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention belongs to the technical field of nondestructive testing and maintenance of a heat transfer tube of a steam generator, and particularly relates to a swelling clamping device of the heat transfer tube of the steam generator; the device comprises an outer cylinder and an inner cylinder; the inner cylinder is arranged in the outer cylinder, the outer cylinder pushes the inner cylinder to enter and exit the heat transfer tube, and the inner cylinder is expanded in the heat transfer tube or loosened to exit the heat transfer tube; the outer cylinder comprises an outer cylinder sleeve, a Kong Danhuang and an outer cylinder sealing ring; the outer cylinder sleeve is of a cylindrical structure, a pipe inlet is formed in the lower bottom surface of the outer cylinder sleeve, an annular groove is formed in the middle lower portion of the inner wall of the outer cylinder sleeve, an outer cylinder sealing ring is arranged in the annular groove, a through hole is formed in the upper bottom surface of the outer cylinder sleeve, an annular spring groove is formed in the lower portion of the upper bottom surface of the outer cylinder sleeve, a hole spring is arranged in the annular spring groove, an inner cylinder is arranged in the outer cylinder sleeve, and the upper portion of the inner cylinder is tightly pressed with Kong Danhuang; when the cylinder sleeve is ventilated and boosted, the inner cylinder is pushed to overcome the acting force of the hole spring to move upwards, and the top of the inner cylinder stretches into the heat transfer pipe to expand tightly.
Description
Technical Field
The invention belongs to the technical field of nondestructive testing and maintenance of heat transfer tubes of steam generators and similar equipment, and particularly relates to a swelling clamping device of a heat transfer tube of a steam generator.
Background
In order to ensure safe and reliable operation of the steam generator which is a key device of the nuclear power station, the heat transfer tube of the steam generator must be overhauled regularly. The internationally common method is that by means of eddy current inspection, pipe blocking and the like, the in-service inspection of the heat transfer pipe is carried out regularly through the positioning robot, and the heat transfer pipe with the exceeding defect is retired by technical means of pipe blocking and the like in time, so that the safe operation of the nuclear power station is ensured.
The steam generator water chamber is a hemispherical, the inner part of the spherical body of the water chamber is smooth, heat transfer tubes are distributed and arranged on the tube plate of the hemispherical body according to a rule, the heat transfer tubes are generally arranged in a regular triangle or square shape on the tube plate of the steam generator, and the heat transfer tubes are generally in a wall thickness of a few millimeters. To realize the operation in the water chamber of the steam generator, the automatic inspection device can generally utilize the manhole flange surface or the pipe orifice of the pipe plate heat transfer pipe as an attachment point, so that the automatic inspection device can realize the operations such as the eddy current inspection of the heat transfer pipe, the pipe end weld inspection and the like. The inspection equipment alternately clamps the tube plates of the heat transfer tubes by virtue of the clamping mechanisms so as to realize the positioning function of the heat transfer tubes, and after the positioning is finished, the eddy current probe is inserted into the corresponding heat transfer tube to perform inspection.
Disclosure of Invention
The invention aims to provide a expansion clamping device for a heat transfer tube of a steam generator, which aims to provide reliable expansion clamping function for automatic inspection equipment of the heat transfer tube of the steam generator, so that the expansion clamping device can stably realize walking function on a tube plate of the steam generator.
In order to solve the technical problems, the invention adopts the following technical scheme:
a steam generator heat transfer tube expansion clamping device comprises an outer cylinder and an inner cylinder; the inner cylinder is arranged in the outer cylinder, the outer cylinder pushes the inner cylinder to enter and exit the heat transfer tube, and the inner cylinder is expanded in the heat transfer tube or loosened to exit the heat transfer tube;
the outer cylinder comprises an outer cylinder sleeve, a Kong Danhuang and an outer cylinder sealing ring;
the outer cylinder sleeve is of a cylindrical structure, a pipe inlet is formed in the lower bottom surface of the outer cylinder sleeve, an annular groove is formed in the middle lower portion of the inner wall of the outer cylinder sleeve, an outer cylinder sealing ring is arranged in the annular groove, a through hole is formed in the upper bottom surface of the outer cylinder sleeve, an annular spring groove is formed in the lower portion of the upper bottom surface of the outer cylinder sleeve, a hole spring is arranged in the annular spring groove, an inner cylinder is arranged in the outer cylinder sleeve, the upper portion of the inner cylinder is tightly pressed with Kong Danhuang, and when the inner cylinder moves upwards, the top of the inner cylinder extends out of the outer cylinder sleeve through the through hole in the upper bottom surface of the outer cylinder sleeve;
under the action force of the hole spring, the inner cylinder is pushed to the bottom of the outer cylinder sleeve, and when the air inlet of the pipe entering through the lower bottom surface of the outer cylinder sleeve ventilates and boosts the pressure in the outer cylinder sleeve, the inner cylinder is pushed to move upwards against the action force of the hole spring, and the top of the inner cylinder penetrates through the outer cylinder sleeve and stretches into the heat transfer pipe to expand tightly.
The inner cylinder comprises a sleeve, a clamping piece, a core bar, a core seat, a piston, a locking spring, a return elastic ring, a guide sleeve, a cylindrical roller, an expansion air inlet hole, a retraction air inlet, an inner cylinder upper sealing ring, an inner cylinder lower sealing ring, a floating spring seat and an end cover;
the sleeve is of a cylindrical tubular structure, an annular limiting table is machined on the inner side of the upper section of the sleeve, a sealing cover is arranged at the bottom of the sleeve, and an inner cylinder lower sealing ring is arranged between the sealing cover and the inner wall of the sleeve for sealing;
the piston is of a cylindrical structure, the piston is arranged in the sleeve, the piston is erected on the sealing cover through the locking spring, and an inner cylinder upper sealing ring is arranged at the contact part of the piston and the sleeve for sealing;
the inner cavity of the piston is of an inverted trapezoid hole structure, the core seat is arranged in the piston, the floating spring seat is arranged at the lower part of the sleeve annular limiting table, the upper section of the floating spring seat is matched with the annular surface of the sleeve annular limiting table, and a sealing ring is arranged for sealing;
the center of the floating spring seat is provided with a through hole, the core seat is arranged in the through hole of the floating spring seat, the core seat can move up and down along the floating spring seat, and the contact surface between the upper section of the core seat and the floating spring seat is provided with a sealing ring for sealing;
the lower section of the core seat is of a trapezoid cylindrical structure; a gap exists between the outer surface of the lower section of the core seat and the inner surface of the piston, the cylindrical roller is arranged at the gap between the core seat and the piston, when the piston moves upwards, the gap between the core seat and the piston is reduced, the installation space of the cylindrical roller is extruded, and the core seat is pushed to move downwards relative to the piston;
the core rod is arranged at the upper part of the core seat, and the guide sleeve is arranged at the upper part of the sleeve through the end cover and extends into the guide cylinder;
the guide cylinder is axially provided with a plurality of vertical slotted holes, the clamping piece is arranged in the vertical slotted holes, the outer part of the lower section of the clamping piece is provided with a restoring elastic ring, and the upper section of the core rod is of an inverted trapezoid cylindrical structure; when the core seat moves downwards relative to the piston, the core seat drives the core rod to move downwards, and the clamping piece is pushed to expand outwards, so that the clamping piece is tightly attached to the inner wall of the heat transfer tube, and expansion is realized.
When the heat transfer tube is required to be loosened, the retraction air inlet is used for ventilating and pressurizing an upper cavity formed by the piston and the sleeve, under the action of air pressure, the piston is pushed to overcome the acting force of the locking spring to move downwards, the space between the piston and the core seat is increased, the cylindrical roller gradually reduces the extrusion of the core seat, the card is contracted into the guide cylinder under the action of the return elastic ring, the card pushes the core seat upwards in the retraction process, the core rod drives the core seat to act upwards, the self-locking function of the locking spring is released, and the action of loosening the heat transfer tube is completed.
The bottom of the right side of the sleeve is provided with an expansion air inlet, when the heat transfer pipe needs to be expanded, air pressure of the piston and the upper cavity of the sleeve is withdrawn from the retraction air inlet, the air pressure is inflated and pressurized to the piston and the lower cavity of the sleeve through the expansion air inlet, the piston moves upwards relative to the sleeve under the action force of the air pressure and the locking spring, the gap between the core seat and the piston is reduced, the installation space of the cylindrical roller is extruded, the core seat is pushed to move downwards relative to the piston, the core seat drives the core rod to move downwards, the clamping piece is pushed to expand outwards to tightly attach the inner wall of the heat transfer pipe, and the expansion is realized.
The inner cylinder also comprises a floating spring, the floating spring is arranged on the floating spring frame, and the upper part of the floating spring presses the bottom of the card;
when the expansion air inlet hole charges air to the lower cavities of the piston and the sleeve, the piston moves upwards relative to the sleeve under the action of air pressure and the locking spring, the gap between the core seat and the piston is reduced, the installation space of the cylindrical roller is extruded, the core seat is pushed to move downwards relative to the piston, the core seat drives the core rod to move downwards, and the clamping piece is pushed to expand outwards to be tightly attached to the inner wall of the heat transfer tube;
when the core rod continues to move downwards, and the heat transfer pipe is not expanded, the card can move downwards along with the core rod against the floating spring, the floating spring is connected with the displacement sensor, and the displacement sensor detects the displacement of the floating spring to determine whether the card expands the heat transfer pipe.
The number of the cards is more than or equal to 2.
The number of the cards is 3 or 4.
The invention has the technical effects that:
(1) The invention relates to a heat transfer tube expansion clamping device of a steam generator, which adopts compressed gas, a spring and an elastic ring as driving sources and is mutually matched with a mechanism of the action of an inner cylinder and an outer cylinder, so that the expansion clamping device can realize the two functions of yielding a tube orifice of the heat transfer tube and clamping the heat transfer tube on the heat transfer tube.
(2) According to the expansion clamping device for the heat transfer tube of the steam generator, the self-locking function is realized by the force realized by the spring, so that the expansion clamping device can provide enough force to enable the expansion clamping device to fall off from the tube plate of the steam generator when an air source is lost or the expansion clamping device fails.
(3) The expansion clamping device for the heat transfer tube of the steam generator can realize the force increasing effect through the realization of the piston, the cylindrical roller and the core seat, and the reverse movement, wherein a taper gap exists between the piston and the core seat, the cylindrical roller is arranged in the gap to play the role of a lever-like fulcrum, and the multiple of the force increasing effect can be adjusted by adjusting the taper.
(4) The invention relates to a clamping device for expanding a heat transfer tube of a steam generator, wherein a card belongs to consumable materials, and the card can be replaced by disassembling a return elastic ring, so that the maintenance is quite convenient.
(5) The expansion clamping device for the heat transfer tube of the steam generator can adapt to the tube diameters of heat transfer tubes with different sizes by adjusting the thickness, the diameter, the gradient and other parameters of the clamping piece and the core bar.
(6) According to the expansion clamping device for the heat transfer tube of the steam generator, the displacement of the hole spring or the follow-up mechanism thereof is detected through the displacement sensor, so that the clamping state of the expansion clamping device is judged, and the control system judges whether manual intervention or maintenance is needed for the inspection equipment of the heat transfer tube.
Drawings
FIG. 1 is a schematic diagram of a steam generator heat transfer tube positioning robot;
FIG. 2 is a schematic view of a steam generator heat transfer tube expansion clamping device according to the present invention;
in the figure: 01-steam generator heat transfer tube positioning robot, 02-expansion clamping device, 1-outer cylinder sleeve, 2-let Kong Danhuang, 3-sleeve, 4-outer cylinder sealing ring, 5-card, 6-core bar, 7-core seat, 8-piston, 9-locking spring, 10-floating spring, 11-return spring ring, 12-guide sleeve, 13-cylindrical roller, 14-expansion air inlet hole, 15-retraction air inlet, 16-pipe inlet, 17-inner cylinder upper sealing ring, 18-inner cylinder lower sealing ring, 19-floating spring seat and 20-end cover.
Detailed Description
The invention relates to a heat transfer tube expansion clamping device of a steam generator, which is specifically described below with reference to the detailed description and the accompanying drawings.
As shown in fig. 1, the expansion clamping device 02 is arranged at the tail end of the bionic foot of the steam generator heat transfer tube positioning robot 01, stretches into the heat transfer tube to perform expansion clamping, and the expansion clamping device 02 is a key component of the steam generator heat transfer tube positioning robot 01, and the reliability of the expansion clamping device directly influences various performances such as the load, the dead weight and the appearance of the steam generator heat transfer tube positioning robot 01.
As shown in fig. 2, the expansion clamping device of the heat transfer tube of the steam generator comprises an outer cylinder and an inner cylinder; the inner cylinder is arranged in the outer cylinder, the outer cylinder pushes the inner cylinder to enter and exit the heat transfer tube, and the inner cylinder is expanded in the heat transfer tube or loosened to exit the heat transfer tube;
the outer cylinder comprises an outer cylinder sleeve 1, a hole spring 2 and an outer cylinder sealing ring 4;
the outer cylinder sleeve 1 is of a cylindrical structure, a pipe inlet 16 is formed in the lower bottom surface of the outer cylinder sleeve 1, an annular groove is formed in the middle lower portion of the inner wall of the outer cylinder sleeve 1, an outer cylinder sealing ring 4 is arranged in the annular groove, a through hole is formed in the upper bottom surface of the outer cylinder sleeve 1, an annular spring groove is formed in the lower portion of the upper bottom surface of the outer cylinder sleeve 1, a hole spring 2 is arranged in the annular spring groove, an inner cylinder is arranged in the outer cylinder sleeve 1, the upper portion of the inner cylinder is in contact with the hole spring 2, the inner cylinder can move up and down in the outer cylinder sleeve 1, and when the inner cylinder moves upwards, the top of the inner cylinder extends out of the outer cylinder sleeve 1 through the through hole in the upper bottom surface of the outer cylinder sleeve 1;
under the action force of the hole spring 2, the inner cylinder is pushed to the bottom of the outer cylinder sleeve 1 in a normal state, and after ventilation and pressure boosting are carried out to the inside of the outer cylinder sleeve 1 through the lower bottom surface of the outer cylinder sleeve 1, the inner cylinder is pushed to overcome the action force of the hole spring 4, the inner cylinder moves upwards, and the top of the inner cylinder extends out of the outer cylinder sleeve 1 and further stretches into the heat transfer pipe to expand;
the inner cylinder comprises a sleeve 3, a clamping piece 5, a core bar 6, a core seat 7, a piston 8, a locking spring 9, a return elastic ring 11, a guide sleeve 12, a cylindrical roller 13, an expansion air inlet 14, a retraction air inlet 15, an inner cylinder upper sealing ring 17, an inner cylinder lower sealing ring 18, a floating spring seat 19 and an end cover 20;
the sleeve 3 is of a cylindrical tubular structure, an annular limiting table is machined on the inner side of the upper section of the sleeve 3, a sealing cover is arranged at the bottom of the sleeve 3, and an inner cylinder lower sealing ring 18 is arranged between the sealing cover and the inner wall of the sleeve 3 for sealing;
the piston 8 is of a cylindrical structure, the piston 8 is arranged in the sleeve 3, the piston 8 is erected on the sealing cover through a locking spring 9, the piston 8 can move up and down on the sleeve 3, and an inner cylinder upper sealing ring 17 is arranged at the contact position of the piston 8 and the sleeve 3 for sealing;
the inner cavity of the piston 8 is of an inverted trapezoid hole structure, the upper part of the inner cavity is wide, the lower part of the inner cavity is narrow, the core seat 7 is arranged in the piston 8, the floating spring seat 19 is arranged at the lower part of the annular limiting table of the sleeve 3, the upper section of the floating spring seat 19 is matched with the annular surface of the annular limiting table of the sleeve 3, and a sealing ring is arranged for sealing;
the lower section of the floating spring seat 19 is of an inverted trapezoid cylindrical structure, and the upper section is wide and the lower section is narrow; the lower inverted trapezoid outer surface of the floating spring seat 19 is matched with the inner surface of the inverted trapezoid hole of the upper section of the piston 8, and when the piston 8 moves upwards relative to the sleeve 3, the floating spring seat 19 moves downwards relative to the piston 8;
a through hole is formed in the center of the floating spring seat 19, the core seat 7 is arranged in the through hole of the floating spring seat 19, the core seat 7 can move up and down along the floating spring seat 19, and a sealing ring is arranged at the contact surface between the upper section of the core seat 7 and the floating spring seat 19 for sealing;
the lower section of the core seat 7 is of a trapezoid cylindrical structure, and the upper part of the lower section is narrow and the lower part of the lower section is wide; a gap exists between the outer surface of the lower section of the core seat 7 and the inner surface of the piston 8, a cylindrical roller 13 is arranged at the gap between the core seat 7 and the piston 8, when the piston 8 moves upwards, the gap between the core seat 7 and the piston 8 becomes smaller, the installation space of the cylindrical roller 13 is extruded, and the core seat 7 is pushed to move downwards relative to the piston 8;
the core bar 6 is arranged at the upper part of the core seat 7, the guide sleeve 12 is arranged at the upper part of the sleeve 3 through the end cover 20, and the core bar 7 stretches into the guide sleeve 12;
the guide cylinder 12 is provided with a plurality of vertical slotted holes along the axial direction, the clamping piece 5 is arranged in the vertical slotted holes, the outer part of the lower section of the clamping piece 5 is provided with a restoring spring ring 11, the upper section of the core rod 7 is of an inverted trapezoid cylindrical structure, and the upper section is wide and the lower section is narrow; when the core seat 7 moves downwards relative to the piston 8, the core seat 7 drives the core rod 6 to move downwards, and the card 5 is pushed to expand outwards, so that the card 7 is tightly attached to the inner wall of the heat transfer tube, and expansion is realized;
the right side of the annular limiting table of the sleeve 3 is provided with a retraction air inlet 15, when a heat transfer pipe needs to be loosened, the upper cavity formed by the piston 8 and the sleeve 3 is ventilated and pressurized through the retraction air inlet 15, under the action of air pressure, the piston 8 is pushed to overcome the acting force of the locking spring 9 to move downwards, the space between the piston 8 and the core seat 7 is increased, the cylindrical roller 13 gradually reduces the extrusion of the core seat 7, the card 5 is contracted into the guide cylinder 12 under the action of the return elastic ring 11, the core bar 6 is pushed upwards in the retraction process of the card 5, the core bar 6 drives the core seat 7 to act upwards, the self-locking function of the locking spring 9 is released, and the action of loosening the heat transfer pipe is completed;
the bottom of the right side of the sleeve 3 is provided with an expansion air inlet 14, when the heat transfer pipe needs to be expanded, air pressure of the piston 8 and the upper cavity of the sleeve 3 is withdrawn from the retraction air inlet 15, the air pressure is inflated and pressurized to the lower cavities of the piston 8 and the sleeve 3 through the expansion air inlet 14, the piston 8 moves upwards relative to the sleeve 5 under the action of the air pressure and the locking spring 9, the gap between the core seat 7 and the piston 8 is reduced, the installation space of the cylindrical roller 13 is extruded, the core seat 7 is pushed to move downwards relative to the piston 8, the core seat 7 drives the core rod 6 to move downwards, and the card 5 is pushed to expand outwards to tightly attach the inner wall of the heat transfer pipe, so that the expansion is realized;
the inner cylinder further comprises a floating spring 10, the floating spring 10 is arranged on a floating spring frame 19, and the upper part of the floating spring 10 presses the bottom of the card 5;
when the expansion air inlet hole 14 charges air to the lower cavities of the piston 8 and the sleeve 3, the piston 8 moves upwards relative to the sleeve 5 under the action of air pressure and the locking spring 9, the gap between the core seat 7 and the piston 8 is reduced, the installation space of the cylindrical roller 13 is extruded, the core seat 7 is pushed to move downwards relative to the piston 8, the core seat 7 drives the core rod 6 to move downwards, and the clamping piece 5 is pushed to expand outwards to be tightly attached to the inner wall of the heat transfer tube;
when the core bar 6 continues to move downwards, as the card 5 is not expanded outwards, if the card 5 does not expand the heat transfer tube due to insufficient friction force and the like, the card 5 moves downwards along with the core bar 6 against the floating spring 10, and whether the card 5 expands the heat transfer tube can be determined by detecting the displacement of the floating spring 10 through the displacement sensor; when the card 5 does not provide enough friction force to expand the heat transfer tube, the card 5 can slide in the pulling-back process and can not touch the floating spring 10 to act, so that the signal change of the displacement sensor can not be detected.
When the displacement sensor detects that the floating spring 16 acts, it is judged that the card 5 does not expand the heat transfer tube, and at the moment, manual intervention or maintenance of the expansion clamping mechanism is required. If the displacement sensor does not detect the action of the floating spring 10, the card 5 is expanded outwards by lateral force, and when pressed to the wall of the heat transfer tube, the card 5 generates static friction force with the heat transfer tube, so that the card is expanded on the heat transfer tube.
When accidents or faults occur, the steam generator heat transfer tube positioning robot 01 loses power, the expansion clamping device 02 is kept by the acting force of the locking spring 9, and the card 5 is in an open state under the action of the locking spring 9, so that a mechanical self-locking function is realized.
Claims (7)
1. The utility model provides a steam generator heat transfer tube expands tightly clamping device which characterized in that: the device comprises an outer cylinder and an inner cylinder; the inner cylinder is arranged in the outer cylinder, the outer cylinder pushes the inner cylinder to enter and exit the heat transfer tube, and the inner cylinder is expanded in the heat transfer tube or loosened to exit the heat transfer tube; the outer cylinder comprises an outer cylinder sleeve, a Kong Danhuang and an outer cylinder sealing ring; the outer cylinder sleeve is of a cylindrical structure, a pipe inlet is formed in the lower bottom surface of the outer cylinder sleeve, an annular groove is formed in the middle lower portion of the inner wall of the outer cylinder sleeve, an outer cylinder sealing ring is arranged in the annular groove, a through hole is formed in the upper bottom surface of the outer cylinder sleeve, an annular spring groove is formed in the lower portion of the upper bottom surface of the outer cylinder sleeve, a hole spring is arranged in the annular spring groove, an inner cylinder is arranged in the outer cylinder sleeve, the upper portion of the inner cylinder is tightly pressed with Kong Danhuang, and when the inner cylinder moves upwards, the top of the inner cylinder extends out of the outer cylinder sleeve through the through hole in the upper bottom surface of the outer cylinder sleeve; under the action force of the hole spring, the inner cylinder is pushed to the bottom of the outer cylinder sleeve, and when the air inlet of the pipe entering the lower bottom surface of the outer cylinder sleeve ventilates and boosts the pressure in the outer cylinder sleeve, the inner cylinder is pushed to move upwards against the action force of the hole spring, and the top of the inner cylinder penetrates through the outer cylinder sleeve and stretches into the heat transfer pipe to expand tightly; the compression gas, the spring and the elastic ring are adopted as driving sources, and the mechanism of the actions of the inner cylinder and the outer cylinder are matched with each other, so that the expansion device can realize two functions of yielding the pipe orifice of the heat transfer pipe and clamping the heat transfer pipe on the heat transfer pipe; the self-locking function is realized by the force of the spring, so that the expansion device can provide enough force to lead the expansion device to fall off from the tube plate of the steam generator when the air source is lost or the expansion device fails; the force increasing effect can be realized through the realization of the piston, the cylindrical roller and the core seat, the reverse motion is realized, a taper gap exists between the piston and the core seat, the cylindrical roller is arranged in the gap to play the role of a lever-like fulcrum, and the multiple of the force increasing can be adjusted through adjusting the taper.
2. The steam generator heat transfer tube expansion clamp of claim 1, wherein: the inner cylinder comprises a sleeve, a clamping piece, a core bar, a core seat, a piston, a locking spring, a return elastic ring, a guide sleeve, a cylindrical roller, an expansion air inlet hole, a retraction air inlet, an inner cylinder upper sealing ring, an inner cylinder lower sealing ring, a floating spring seat and an end cover; the sleeve is of a cylindrical tubular structure, an annular limiting table is machined on the inner side of the upper section of the sleeve, a sealing cover is arranged at the bottom of the sleeve, and an inner cylinder lower sealing ring is arranged between the sealing cover and the inner wall of the sleeve for sealing; the piston is of a cylindrical structure, the piston is arranged in the sleeve, the piston is erected on the sealing cover through the locking spring, and an inner cylinder upper sealing ring is arranged at the contact part of the piston and the sleeve for sealing; the inner cavity of the piston is of an inverted trapezoid hole structure, the core seat is arranged in the piston, the floating spring seat is arranged at the lower part of the sleeve annular limiting table, the upper section of the floating spring seat is matched with the annular surface of the sleeve annular limiting table, and a sealing ring is arranged for sealing; the center of the floating spring seat is provided with a through hole, the core seat is arranged in the through hole of the floating spring seat, the core seat can move up and down along the floating spring seat, and the contact surface between the upper section of the core seat and the floating spring seat is provided with a sealing ring for sealing; the lower section of the core seat is of a trapezoid cylindrical structure; a gap exists between the outer surface of the lower section of the core seat and the inner surface of the piston, the cylindrical roller is arranged at the gap between the core seat and the piston, when the piston moves upwards, the gap between the core seat and the piston is reduced, the installation space of the cylindrical roller is extruded, and the core seat is pushed to move downwards relative to the piston; the core rod is arranged at the upper part of the core seat, and the guide sleeve is arranged at the upper part of the sleeve through the end cover and extends into the guide cylinder; the guide cylinder is axially provided with a plurality of vertical slotted holes, the clamping piece is arranged in the vertical slotted holes, the outer part of the lower section of the clamping piece is provided with a restoring elastic ring, and the upper section of the core rod is of an inverted trapezoid cylindrical structure; when the core seat moves downwards relative to the piston, the core seat drives the core rod to move downwards, and the clamping piece is pushed to expand outwards, so that the clamping piece is tightly attached to the inner wall of the heat transfer tube, and expansion is realized.
3. A steam generator heat transfer tube expansion clamp as set forth in claim 2, wherein: when the heat transfer tube is required to be loosened, the retraction air inlet is used for ventilating and pressurizing an upper cavity formed by the piston and the sleeve, under the action of air pressure, the piston is pushed to overcome the acting force of the locking spring to move downwards, the space between the piston and the core seat is increased, the cylindrical roller gradually reduces the extrusion of the core seat, the card is contracted into the guide cylinder under the action of the return elastic ring, the card pushes the core seat upwards in the retraction process, the core rod drives the core seat to act upwards, the self-locking function of the locking spring is released, and the action of loosening the heat transfer tube is completed.
4. A steam generator heat transfer tube expansion clamp as claimed in claim 3, wherein: the bottom of the right side of the sleeve is provided with an expansion air inlet, when the heat transfer pipe needs to be expanded, air pressure of the piston and the upper cavity of the sleeve is withdrawn from the retraction air inlet, the air pressure is inflated and pressurized to the piston and the lower cavity of the sleeve through the expansion air inlet, the piston moves upwards relative to the sleeve under the action force of the air pressure and the locking spring, the gap between the core seat and the piston is reduced, the installation space of the cylindrical roller is extruded, the core seat is pushed to move downwards relative to the piston, the core seat drives the core rod to move downwards, the clamping piece is pushed to expand outwards to tightly attach the inner wall of the heat transfer pipe, and the expansion is realized.
5. The expansion clamping device of a steam generator heat transfer tube of claim 4, wherein: the inner cylinder also comprises a floating spring, the floating spring is arranged on the floating spring frame, and the upper part of the floating spring presses the bottom of the card; when the expansion air inlet hole charges air to the lower cavities of the piston and the sleeve, the piston moves upwards relative to the sleeve under the action of air pressure and the locking spring, the gap between the core seat and the piston is reduced, the installation space of the cylindrical roller is extruded, the core seat is pushed to move downwards relative to the piston, the core seat drives the core rod to move downwards, and the clamping piece is pushed to expand outwards to be tightly attached to the inner wall of the heat transfer tube; when the core rod continues to move downwards, and the heat transfer pipe is not expanded, the card can move downwards along with the core rod against the floating spring, the floating spring is connected with the displacement sensor, and the displacement sensor detects the displacement of the floating spring to determine whether the card expands the heat transfer pipe.
6. A steam generator heat transfer tube expansion clamp as set forth in claim 2, wherein: the number of the cards is more than or equal to 2.
7. The steam generator heat transfer tube expansion clamping device of claim 6, wherein: the number of the cards is 3 or 4.
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| CN201711439892.5A CN109973758B (en) | 2017-12-27 | 2017-12-27 | Expansion clamping device for heat transfer tube of steam generator |
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| CN201711439892.5A CN109973758B (en) | 2017-12-27 | 2017-12-27 | Expansion clamping device for heat transfer tube of steam generator |
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| CN109973758A CN109973758A (en) | 2019-07-05 |
| CN109973758B true CN109973758B (en) | 2024-04-09 |
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| CN110335689B (en) * | 2019-07-12 | 2020-08-28 | 哈尔滨工程大学 | Inner hole positioning device, positioning method and crawling mechanism |
| CN110634581B (en) * | 2019-09-25 | 2022-09-16 | 哈尔滨工业大学 | Heat transfer pipe overhauls location hole clamping mechanism |
| CN114179117A (en) * | 2021-12-31 | 2022-03-15 | 核动力运行研究所 | Pneumatic jack catch actuating mechanism based on shifter |
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