CN217142814U - Detachable sampling device for verifying automatic tube plate welding and tube plugging technology - Google Patents

Abstract

The utility model discloses a can dismantle sampling device for automatic stifled tub of technical verification of tube sheet welding, the device include with the relative position of high temperature gas cooled reactor nuclear power station site steam generator tube sheet with the unanimous tube sheet of taking the tube hole of size, with the high temperature gas cooled reactor nuclear power station site steam generator income water end and the unanimous assembly hole site and the screw thread that can dismantle appearance piece, be fixed in the tube sheet with appearance piece with the unanimous tube sheet material of main steam outlet end. The tube plate is used for checking the welding accessibility of automatic welding pipe plugging equipment, and the detachable sample piece is used for checking the metallographic phase and the performance of the welding plug; the utility model discloses on the basis of utilizing low grade material to make with site size, the unanimous tube sheet in position, realize that welding position's material is unanimous with the scene through dismantling local tube sheet and tube hole, overcome the high cost of conventional sampling device and method, low efficiency shortcoming.

Description

Detachable sampling device for verifying automatic tube plate welding and tube plugging technology

Technical Field

The utility model belongs to nuclear power safety operation maintenance support field, concretely relates to a can dismantle sampling device for automatic stifled tub of technical verification of tube sheet welding belongs to the suitability of automatic stifled tub of technical verification and the low-cost high-efficient sampling technique of welded joint.

Background

Steam generator is one of the most crucial equipment in thermal power and nuclear power system, compares in thermal power equipment, and is more preferred than heat exchange efficiency to steam generator's high fail safe nature requirement in the nuclear power field, and the material specification of selecting is higher, and size allowance is bigger. In the steam generator, the heat exchange tube is an important component of a primary circuit pressure boundary, is an important barrier for preventing radioactive fission products from leaking out, and is the weakest link of a primary circuit system. In the service process, the heat transfer pipe can generate mechanical or chemical damage in the environments of thermal shock, vibration abrasion and the like for a long time. When the heat exchange pipe is perforated, the radioactive coolant leaks out, so that serious environmental pollution is caused, and great negative impact is generated to the society. Therefore, the automatic pipe-plugging welding technology is developed to plug the damaged heat transfer pipe from the water supply end and the two ends of the main steam outlet, so that major accidents are avoided, and the automatic pipe-plugging welding technology with high reliability is an important safety guarantee for the nuclear power field.

In the development process of the automatic welding pipe plugging technology, because technical examination and destructive sampling can not be carried out on a steam generator in practical application on the site of a nuclear power station, a simulation device similar to or consistent with the site must be built. However, the steam generator tube plate in the nuclear power field has extremely high specification, the production cost of nuclear-grade materials is about 10 times of that of non-nuclear-grade materials with the same components, the diameter of the whole tube plate reaches more than 4000mm, the thickness reaches more than 200mm, and the weight reaches more than 10 tons. The manufacturing cost of the 1:1 simulation setup is extremely high. Furthermore, after the accessibility and weldability test verification of the automatic welding pipe plugging device is completed, the welding pipe plugging part needs to be sampled by destructive sampling methods such as machining, flame cutting and the like for metallographic examination, mechanical property tests such as water pressure, creep, fatigue, strength and the like, tightness tests such as helium leakage detection and the like, and the quality reliability of the welding plug is evaluated, so that the final optimized welding pipe plugging parameters are obtained. Besides the difficulty in cutting and sampling, the tube plate can be damaged by cutting and sampling, and the metallographic structure of the welded plug can be affected by heat when high-energy beams such as flame and the like are used for cutting, so that the difference between the plug which is finally observed and tested and the plug which is actually welded exists. Therefore, a sampling device and a method which are consistent with the on-site size and position characteristics, consistent with the material of the on-site tube plate at the position of the welded pipe blockage, high in flexibility, high in efficiency and low in cost are urgently needed.

Disclosure of Invention

To the urgent demand of nuclear power field automatic welding stifled pipe technique development verification in-process to high flexibility, high efficiency, low-cost sampling device, the utility model discloses a strategy through the detachable sample aims at providing a can dismantle sampling device that is used for automatic stifled pipe technique of tube sheet welding to verify, the utility model discloses on the basis of utilizing low grade material to make with site dimensions, the unanimous tube sheet in position, through can dismantle local tube sheet and tube hole and realize that welding position's material is unanimous with the scene, has overcome the high cost of conventional sampling device and method, low efficiency shortcoming.

The utility model discloses a realize through following technical scheme:

a detachable sampling device for verifying an automatic tube plate welding and tube plugging technology comprises a tube plate 1 with a tube hole, a detachable sample piece 3, an assembling hole position 2 and a bolt 4, wherein the tube plate 1 is consistent with the relative position and the size of a tube plate of a field steam generator of a high-temperature gas-cooled reactor nuclear power station and is provided with the tube hole, the material of the detachable sample piece 3 is consistent with that of the tube plate of a water inlet end and a main steam outlet end of the field steam generator of the high-temperature gas-cooled reactor nuclear power station, and the detachable sample piece 3 is fixed on the tube plate 1; the tube plate 1 is used for checking the welding accessibility of automatic welding pipe plugging equipment, and the detachable sample piece 3 is used for checking the metallographic phase and the performance of a welding plug.

The tube plate 1 is made of carbon steel or stainless steel material, and the detachable sample piece 3 is made of Inconly 800H nickel-based superalloy or 2 ^1/4 Cr1Mo heat-resistant steel material.

The detachable sample piece 3 comprises a tube hole and a local tube plate, wherein the tube hole is a single hole or multiple holes, and can be used for performing welding accessibility assessment on a single-hole plugged tube and performing welding accessibility assessment on an adjacent multiple-hole plugged tube.

One or more assembling hole sites 2 are reserved in the tube plate 1, and the assembling hole sites 2 are positioned in the center of the tube plate or at the edge of the tube plate and used for installing detachable sample pieces 3 with different specifications.

The assembling hole position 2 of the tube plate and the detachable sample piece 3 are connected through threads and bolts, and the plugging welding surfaces of the connected tube plate 1 and the detachable sample piece 3 are located on the same horizontal plane.

The assembly hole site 2 has a counter bore characteristic, and the vertical face of the counter bore is vertical to the tube plate face; the section of the detachable sample piece 3 is circular, regular polygon or rhombus, and the detachable sample piece is connected with the assembling hole site 2 on the premise of not interfering other pipe holes on the pipe plate.

The welding opposite side of the detachable sample piece 3 is a simple plane or designed to be in a flange shape, and meanwhile, metallographic, flaw detection, fatigue, creep, air tightness and water pressure test items are realized.

Compared with the prior art, the utility model discloses possess following advantage:

1) the utility model discloses can satisfy reachability, the welding operability of the automatic stifled pipe device of examination, realize the uniformity of welding position material and scene under the prerequisite of nondestructive sample again.

2) The utility model discloses probably cause the thermal influence to the metallographic structure of welding end cap when can avoiding adopting high energy beam cutting such as flame, the end cap that leads to final observation test and the end cap that actually welds have the shortcoming of difference.

3) The utility model discloses still can promote to other automatic welding technique development sample fields that have bulky, high value, complex environment characteristic.

Drawings

FIG. 1 is a schematic diagram of a detachable sampling device for verifying an automatic tube plate welding tube plugging technology.

Fig. 2a and 2b are schematic top and cross-sectional views, respectively, of a circular single-hole detachable sample.

Fig. 3a and 3b are schematic top and cross-sectional views, respectively, of a diamond-shaped four-hole detachable sample.

Detailed Description

The present invention will now be described in further detail with reference to specific embodiments and drawings, which are illustrative, but not limiting, of the invention.

As shown in fig. 1, the utility model discloses a can dismantle sampling device that is used for automatic tube sheet welding stifled pipe technical verification of realizing low-cost high-efficient sample, the device include with the relative position of high temperature gas cooled reactor nuclear power station on-the-spot steam generator tube sheet and the unanimous tube sheet 1 of pipe hole of size, with the on-the-spot steam generator of high temperature gas cooled reactor nuclear power station in-the-spot steam generator water inlet end and the unanimous sample 3 of dismantling of main steam outlet end tube sheet material, will dismantle sample 3 and fix assembly hole site 2 and bolt 4 on tube sheet 1; the tube plate 1 is used for checking welding accessibility of automatic welding pipe plugging equipment, and the detachable sample piece 3 is used for checking metallographic phase and performance of a welding plug. The left side of the figure 1 is the front side of the tube plate, and the right side is the back side of the tube plate.

Preferably, the tube plate 1 is made of carbon steel or stainless steel material, and the detachable sample piece 3 is made of Inconly 800H nickel-based superalloy or 2 ^1/4 Cr1Mo heat-resistant steel material.

Preferably, the detachable sample 3 comprises a pipe hole and a local pipe plate, the pipe hole can be a single hole or a plurality of holes, and the welding accessibility of the single-hole plugged pipe can be checked, and the welding accessibility of the adjacent multi-hole plugged pipe can also be checked. A single well as shown in fig. 2a and 2b and four wells as shown in fig. 3a and 3 b.

Preferably, one or more assembling hole sites 2 can be reserved in the tube plate 1, and the assembling hole sites 2 can be located in the center of the tube plate or at other positions such as the edge of the tube plate and the like and used for installing detachable sample pieces 3 with different specifications.

Preferably, the assembling hole site 2 of the tube plate and the detachable sample piece 3 are connected through threads and bolts, and the plugging welding surfaces of the connected tube plate 1 and the detachable sample piece 3 are positioned on the same horizontal plane.

Preferably, the assembly hole site 2 has a counter bore characteristic, and the vertical face of the counter bore is vertical to the tube plate face; the section of the detachable sample piece 3 can be circular or rhombic, and the detachable sample piece is connected with the assembling hole site 2 on the premise of not interfering other pipe holes on the pipe plate. The cross-sectional profile is circular as shown in fig. 2a and 2b and diamond as shown in fig. 3a and 3 b.

Preferably, the welding opposite side of the detachable sample piece 3 is a simple plane or designed into a flange shape, and meanwhile, metallographic, flaw detection, fatigue, creep, air tightness and water pressure test items are realized.

A can dismantle sampling device's operating method for automatic tube sheet welding stifled pipe technical verification, this method is implemented according to following step:

firstly, fixing a tube plate 1 with tube holes in a horizontal direction, a vertical direction or an inclined direction according to test requirements, and simulating the relative position of a water inlet end and a main steam outlet end of a steam generator in an actual high-temperature gas-cooled reactor nuclear power system;

secondly, connecting the detachable sample 3 with a specific shape meeting the assessment requirement in the corresponding assembly hole position 2 of the tube plate with the tube hole through threads and a bolt 4;

thirdly, welding and plugging the single hole or the multiple holes where the detachable sample piece 3 is located by adopting automatic welding and plugging equipment;

fourthly, after welding is finished, disassembling the bolt 4, disassembling the detachable sample piece 3, and finishing sampling; the above process is repeated to meet the sampling of different requirements.

The utility model discloses reachability, the welding operability of the automatic stifled pipe device of examination can be satisfied to the device and method, have realized the uniformity of welding position material with the scene under the prerequisite of nondestructively sampling again.

Claims (7)

1. The utility model provides a can dismantle sampling device that is used for automatic stifled pipe technique of tube sheet welding to verify which characterized in that: the device comprises a tube plate (1) with a tube hole, a detachable sample piece (3), an assembly hole position (2) and a bolt (4), wherein the tube plate (1) is consistent with the relative position and the size of a tube plate of a site steam generator of the high-temperature gas-cooled reactor nuclear power station, the detachable sample piece (3) is consistent with the material of the tube plate of a water inlet end and a main steam outlet end of the site steam generator of the high-temperature gas-cooled reactor nuclear power station, and the assembly hole position (2) and the bolt (4) are used for fixing the detachable sample piece (3) on the tube plate (1); the tube plate (1) is used for checking welding accessibility of automatic welding pipe plugging equipment, and the detachable sample piece (3) is used for checking metallographic phase and performance of the welding plug.

2. The removable sampling device for automated tube sheet welding plugging tube technical verification of claim 1, wherein: the tube plate (1) is made of carbon steel or stainless steel material, and the detachable sample piece (3) is made of Inconly 800H nickel-based high-temperature alloy or 2 ^1/4 Cr1Mo heat-resistant steel material.

3. The removable sampling device for automated tube sheet welding plugging tube technical verification of claim 1, wherein: the detachable sample piece (3) comprises a tube hole and a local tube plate, wherein the tube hole is single-hole or multi-hole, and can be used for performing welding accessibility examination on a single-hole plugged tube and performing welding accessibility examination on an adjacent multi-hole plugged tube.

4. The removable sampling device for automated tube sheet welding plugging tube technical verification of claim 1, wherein: one or more assembling hole sites (2) are reserved in the tube plate (1), and the assembling hole sites (2) are positioned in the center of the tube plate or at the edge of the tube plate and used for installing detachable sample pieces (3) with different specifications.

5. The removable sampling device for automated tube sheet welding plugging tube technical verification of claim 1, wherein: the assembling hole site (2) of the tube plate is connected with the detachable sample piece (3) through a screw thread and a bolt, and the plugging welding surface of the connected tube plate (1) and the detachable sample piece (3) is positioned on the same horizontal plane.

6. The detachable sampling device for automated tube sheet welding tube plugging technical verification according to claim 1, wherein: the assembly hole site (2) has a counter bore characteristic, and the vertical surface of the counter bore is vertical to the tube plate surface; the section of the detachable sample piece (3) is circular, regular polygon or diamond.

7. The removable sampling device for automated tube sheet welding plugging tube technical verification of claim 1, wherein: the welding opposite side of the detachable sample piece (3) is a simple plane or designed into a flange shape.

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