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CN-122015021-A - Condenser pipe orifice detection device and detection method thereof

CN122015021ACN 122015021 ACN122015021 ACN 122015021ACN-122015021-A

Abstract

The invention discloses a device and a method for detecting a pipe orifice of a condenser, wherein the device comprises a detection device main body arranged on the inner side of the pipe orifice of the condenser body, a fixing component is arranged at the end part of the detection device main body, the end part of the fixing component is contacted with the inner wall of the condenser body, the fixing component comprises a mounting disc, a connecting piece and a plurality of uniformly distributed support arm components, the support arm components can rotate and stretch, the device is composed of a base, a main arm, a swinging oil cylinder, a telescopic arm and a roller component, the device adopts a double-layer structure of a jacking support leg and the support arm components to realize multipoint close contact and anti-offset shaking, the support arm component adjusts the angle of the main arm and the length of the telescopic arm through the swinging oil cylinder and controls the telescopic arm through a telescopic motor, the roller component rolls cooperatively with a main wheel and an auxiliary wheel, a buffer spring is matched in a buffer groove to absorb shock, a limit frame and a limit bar ensure stable movement, the accuracy of detected data is ensured, and the roller component is driven to move and adjust the detection position through fine adjustment of a driving component so as to realize pipe orifice and peripheral full-range coverage detection.

Inventors

  • Cui Maogong
  • YANG YANG
  • KONG FANLAI
  • CHEN HAO

Assignees

  • 江苏坤全特种设备有限公司

Dates

Publication Date
20260512
Application Date
20251230

Claims (9)

  1. 1. The condenser pipe orifice detection device is characterized by comprising a detection device main body (1), wherein the detection device main body (1) is arranged at the inner side of a pipe orifice of a condenser body (2); The end part of the detection device main body (1) is provided with a fixing component (3), and the end part of the fixing component (3) is contacted with the inner wall of the condenser main body (2); The fixing assembly (3) comprises a mounting disc (31) fixed at the tail of the detection device main body (1), a connecting piece (32) is arranged at the end part of the mounting disc (31), a plurality of support arm assemblies (4) with uniform intervals are fixed on the outer wall of the connecting piece (32), and the support arm assemblies (4) rotate and stretch on the outer wall of the connecting piece (32); The support arm assembly (4) comprises a base (41) fixed on the outer wall of the connecting piece (32), a main arm (42) is installed on the base (41), a swinging oil cylinder (43) is installed between one side of the main arm (42) and the base (41), a telescopic arm (44) is arranged at the end part of the main arm (42), a roller assembly (5) is arranged at the end part of the telescopic arm (44), and the end part of the roller assembly (5) is contacted with the inner wall of the condenser body (2).
  2. 2. The condenser pipe orifice detection device of claim 1, wherein the telescopic arm (44) is arranged in the top of the main arm (42), a telescopic motor (45) is arranged on one side of the main arm (42), the telescopic motor (45) controls the telescopic arm (44) to stretch out and draw back in the main arm (42), an installation seat (46) for installing the roller assembly (5) is arranged at the top of the telescopic arm (44), a buffer groove (461) is arranged at the top of the installation seat (46), and the roller assembly (5) is installed in the installation seat (46) and the buffer groove (461).
  3. 3. The condenser pipe orifice detection device of claim 2, wherein the center of the top of the mounting seat (46) is a plane, two sides of the mounting seat are inclined planes, the buffer groove (461) is arranged at the middle position, the roller assembly (5) comprises a main wheel frame (51) arranged in the buffer groove (461), a butt joint block (52) is arranged at the bottom of the main wheel frame (51), the butt joint block (52) is arranged in the buffer groove (461), a limit frame (53) is arranged at the edge of the bottom of the butt joint block (52), a limit strip (462) matched with the limit frame (53) is arranged at the notch of the buffer groove (461), a buffer spring (54) is arranged between the bottom of the butt joint block (52) and the bottom of the buffer groove (461), mounting lugs (55) are arranged at two sides of the top of the main wheel frame (51), a fixed shaft (56) is arranged at the inner side of the top of the mounting lugs (55), a main wheel (57) is arranged at the outer side of the fixed shaft (56), and the outer wall of the main wheel (57) exceeds the mounting lugs (55).
  4. 4. The condenser nozzle detection device according to claim 3, wherein the roller assembly (5) further comprises auxiliary wheel frames (58) arranged on two sides of the top of the mounting seat (46), auxiliary wheels (59) are mounted on the inner sides of the end parts of the auxiliary wheel frames (58), the auxiliary wheel frames (58) and the auxiliary wheels (59) are fixedly mounted, and initial mounting positions of the auxiliary wheels (59) are lower than that of the main wheels (57).
  5. 5. The condenser pipe orifice detection device of claim 1, wherein a movable seat (47) for butt-jointing the swing cylinder (43) is mounted on the outer wall of the main arm (42), a fixed seat (48) matched with the swing cylinder (43) is arranged at the end part of the base (41), connecting sleeves (49) matched with the movable seat (47) and the fixed seat (48) are arranged at the end part of the swing cylinder (43), and the swing cylinder (43) drives the main arm (42) to integrally swing outside the mounting plate (31).
  6. 6. The condenser nozzle detection device according to claim 1, wherein the base (41) is L-shaped, a main seat (411) for mounting the main arm (42) is arranged at the top of the base (41), a connecting sleeve (421) matched with the main seat (411) is arranged at the end part of the main arm (42), and the main arm (42) rotates in the main seat (411).
  7. 7. The condenser nozzle detection device according to claim 1, wherein a docking sleeve (33) is mounted inside the end portion of the mounting plate (31), the connecting piece (32) is mounted at the end portion of the docking sleeve (33) in a positioning manner through an internal positioning pin (34), the connecting piece (32) further comprises a plurality of mounting plates (35) arranged outside the positioning pin (34), and the plurality of support arm assemblies (4) are fixedly mounted on the plurality of mounting plates (35).
  8. 8. The condenser pipe orifice detection device of claim 1, wherein the bottom of the detection device main body (1) is provided with a jacking supporting leg (11), the top of the detection device main body is provided with a handle (12), and the detection device main body (1) is integrally arranged at the central position inside the condenser main body (2).
  9. 9. A condenser nozzle detection apparatus and a detection method thereof according to any one of claims 1 to 8, characterized by comprising: s1, an operator carries the device through a handle (12) at the top of a detection device main body (1), the detection device main body (1) is aligned to a pipe orifice of a condenser main body (2), the detection device main body (1) is gradually arranged at the inner side of the pipe orifice of the condenser main body (2) until a jacking supporting leg (11) at the bottom of the detection device main body (1) contacts with a preset supporting surface in the condenser main body (2), and the whole detection device main body (1) is ensured to be initially positioned at the central position in the condenser main body (2); S2, starting a driving part corresponding to a supporting arm assembly (4) in a fixed assembly (3), driving a main arm (42) to act through a swinging oil cylinder (43), respectively abutting a movable seat (47) on the outer wall of the main arm (42) and a fixed seat (48) on the end part of a base (41) through connecting sleeves (49) at two ends of the swinging oil cylinder (43), driving the main arm (42) to swing and spread outside a mounting disc (31) by taking a main seat (411) on the top of the base (41) as a rotation center under the telescopic action of the swinging oil cylinder (43) until a plurality of supporting arm assemblies (4) are uniformly distributed in a radial mode, and then starting a telescopic motor (45), controlling a telescopic arm (44) to perform telescopic motion in the top of the main arm (42), so that a roller assembly (5) on an installation seat (46) on the end part of the telescopic arm (44) approaches to the inner wall of a condenser body (2) until the outer wall of a main wheel (57) in the roller assembly (5) contacts the inner wall of the condenser body (2); S3, after the device is fixed, a detection function module of the detection device main body (1) is started to detect the pipe orifice and the peripheral area of the condenser main body (2), in the detection process, the swing angle of the main arm (42) can be adjusted by controlling the fine adjustment action of the swing oil cylinder (43), or the extension length of the extension arm (44) is adjusted by the extension motor (45), so that the roller assembly (5) is driven to stably move along the inner wall of the condenser main body (2), the detection position of the detection device main body (1) is further adjusted, the full-range coverage detection of the pipe orifice of the condenser main body (2) is ensured, and in the moving process, the main wheel (57) and the auxiliary wheel (59) cooperatively roll, the buffer spring (54) continuously plays a role of buffering and damping, and the stability of the detection process and the accuracy of detection data are ensured; S4, after the detection of a single pipe orifice is finished, the telescopic arm (44) is controlled to be contracted through the telescopic motor (45) to enable the roller assembly (5) to be separated from the inner wall of the condenser body (2), then the main arm (42) is driven to reversely swing through the swing oil cylinder (43) to enable the plurality of support arm assemblies (4) to be contracted to a state close to the detection device body (1), then an operator lifts the detection device body (1) through the handle (12), the jacking supporting leg (11) at the bottom of the detection device body (1) is separated from the supporting surface, and the detection device body (1) is gradually moved out from the inner side of the pipe orifice of the condenser body (2), so that single detection operation is completed.

Description

Condenser pipe orifice detection device and detection method thereof Technical Field The invention particularly relates to a condenser pipe orifice detection device and a detection method thereof. Background The condenser is a key auxiliary device in a thermal power plant, a nuclear power plant and other steam power devices, and has the main function of condensing exhaust steam generated by a steam turbine into water so as to maintain low back pressure on the exhaust steam side of the steam turbine, thereby ensuring the thermal efficiency and the economical efficiency of the unit. The condenser is generally formed by arranging thousands or even tens of thousands of heat transfer tubes in a certain array, and the tube ends are fixed on the front tube plate and the rear tube plate in an expansion joint or welding mode. The interface between the tube sheet and the heat transfer tube, i.e. "condenser tube orifice", is a key sealing point and potential weak link in the equipment structure. In the long-term operation process, the condenser heat transfer pipe and the pipe orifice area thereof are subjected to thermal stress, mechanical vibration and possibly fluid erosion simultaneously due to direct contact with circulating cooling water and possibly contained impurities, microorganisms, corrosive ions and the like, so that various types of damages are very easy to occur. Typical damage includes corrosion pits, cracks, microcracks, scour thinning, cracking of the expansion or weld joints, seal failure, etc. at the pipe orifice. If the damage is not found and treated in time, the circulating cooling water leaks to the condensate side, the water quality of the boiler feed water is seriously polluted, the scaling and corrosion of subsequent key equipment such as a boiler, a steam turbine and the like are caused, and even the efficiency of a unit is reduced and the unit is stopped in an unplanned manner, so that huge economic loss and safety risks are caused. Therefore, the rapid, comprehensive and accurate detection of the condenser pipe orifice is a vital ring in the preventive maintenance and the state overhaul of the power station. Currently, conventional inspection for condenser nozzles relies primarily on manual visual inspection or traditional non-destructive inspection methods. The common operation flow is that during the shutdown maintenance of the unit, a detector enters a condenser water chamber with narrow space, insufficient light and wet and hot environment, and the appearance of the pipe orifice is observed one by means of simple tools such as a strong light flashlight, a reflector, a magnifier and the like. For the tube orifice suspected of being defective, the tube orifice can be further confirmed by adopting auxiliary means such as dye penetration, endoscopic video observation and the like. The purely manual visual inspection mode is long in time consumption, needs a large amount of manpower, works in the severe environment of the water chamber, is easy to fatigue, and seriously affects the detection progress and the unit maintenance period. And the manual examination is highly dependent on the experience, responsibility, vision status and then attention of the inspector. Facing to a large number of nozzles with similar appearance, fine defects are easily missed due to visual fatigue. Meanwhile, the defect type judgment is high in subjectivity, lacks objective and unified quantification standards, and is easy to produce misjudgment. The nondestructive detection means such as ultrasonic detection, vortex detection, magnetic powder detection are commonly used, the cleanliness requirement on the inner wall of the pipe orifice is extremely high, scaling and greasy dirt are required to be removed in advance, the coupling effect of the detection probe and the inner wall of the pipe orifice directly influences the detection precision, the suitability of the detection probe for the curved surface of the inner wall of the pipe orifice with a large diameter is poor, part of detection equipment is complex in operation, quick detection of the pipe orifices in batches is difficult to realize, and the detection cost is high. The existing automatic detection device is poor in adaptability, most devices are designed only aiming at the pipe orifice of a specific specification, cannot be compatible with the pipe orifice sizes of condensers of different types, and is not enough in universality. Therefore, it is necessary to provide a condenser pipe orifice detection device and a detection method thereof to solve the above problems. Disclosure of Invention Object of the invention The invention aims to provide a condenser pipe orifice detection device and a detection method thereof. (II) technical scheme In order to achieve the aim, the invention provides the technical scheme that the condenser pipe orifice detection device comprises a detection device main body, wherein the detection device main body is arranged at the