Nuclear power station steam generator connecting pipe and main pipeline connection welding seam detection device

Abstract

The invention belongs to the technical field of source pipe positioning, and particularly relates to a nuclear power station steam generator connecting pipe and main pipeline connection weld joint detection device. The positioning bolt and the fastening bolt are mounted on the flange plate, the guide column is mounted on one side of a manhole of the flange plate, the source guide pipe is bent, one end of the source guide pipe extends into the steam generator through the manhole of the steam generator, the other end of the source guide pipe is positioned and mounted on the manhole side of the flange plate through the mounting seat, and the flange handles are symmetrically mounted on the non-manhole side of the flange plate through screws. The installation handles are symmetrically fixed to the non-manhole side of the flange plate, the worm gear and worm mechanism composed of the worm gear and worm is installed on the base, the rocking handle is connected with the worm gear and worm mechanism and installed on the flange plate through the base, the worm gear is provided with a steel wire fixing and winding structure, and movement of a steel wire is achieved through rotation of the worm gear. The steel wire positioning blocks are evenly distributed on the two sides of the source guiding pipe, and the fixed pulleys are symmetrically installed at designated positions on the two sides of the sliding rail. The problems that the device is complex in structure, large in dead weight, low in installation efficiency and the like are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of source pipe positioning, and in particular relates to a device for detecting the weld seam connecting a connecting pipe of a steam generator of a nuclear power plant and a main pipeline. Background Art

[0002] According to the requirements of the relevant inspection specifications of nuclear power plants, welds must be inspected regularly to ensure the sealing state of the welds and prevent leakage. In the prior art, the detection of welds can be carried out by radiation irradiation, that is, emitting radiation on one side of the product with the weld, covering the other side with a radiation film, and judging the quality of the weld by imaging the radiation film. When performing a radiation inspection of the weld connecting the steam generator pipe and the main pipeline, since the radiation source can only be sent into the evaporator through the evaporator manhole and reach the designated position, and the environmental dose at the evaporator manhole is relatively large, it is necessary to use a steam generator pipe and main pipeline connection weld detection device to quickly and accurately position the radiation source to the designated position.

[0003] Patent No. ZL202011548664.3 discloses a multi-stage steam generator tube X-ray detection source tube positioning device. However, the positioning device structure in the evaporator is too complex, with many small parts, which poses a greater risk of foreign matter introduction and a higher failure rate. In addition, it is heavy, difficult to install, and has low installation efficiency, which increases the dose received by personnel. In subsequent maintenance and care, the complex structure also greatly increases maintenance costs. Summary of the invention

[0004] The purpose of the present invention is to provide a nuclear power plant steam generator pipe and main pipeline connection weld detection device to solve the current device problems of complex structure, heavy weight, low installation efficiency, etc., to ensure fast and accurate positioning of the device during installation, to make the installation labor-saving, convenient and fast, thereby reducing personnel dose and saving a lot of time.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A device for detecting the weld seam between a nuclear power plant steam generator pipe and a main pipeline, wherein the positioning bolt is installed on a flange, the fastening bolt is installed on the flange, the guide column is installed on one side of the flange manhole, the source guide pipe is bent, one end of which extends into the interior of the steam generator through the manhole of the steam generator, and the other end is positioned and installed on the manhole side of the flange using a mounting seat, the flange handle is symmetrically installed on the non-manhole side of the flange through screws, the mounting handle is symmetrically fixed on the non-manhole side of the flange, a worm gear mechanism composed of a worm gear is installed on a base, the shaking handle is connected to the worm gear mechanism and is installed on the flange through the base, and the worm gear has a wire fixing and winding structure The movement of the steel wire is achieved by the rotation of the worm gear. The steel wire positioning blocks are evenly distributed on both sides of the source guide tube. The fixed pulleys are symmetrically installed at the specified positions on both sides of the slide rail. One end of the steel wire is connected to the worm gear, and the other end is connected to the support rod base. The position of the steel wire is limited by the steel wire positioning block. The adjustable support rod and the non-adjustable support rod are centrally connected to form a group of support rod mechanisms. The support rod mechanism is installed on the slide rail through a fixed seat and a sliding seat. The guide wheel is connected to the top of the adjustable support rod and the non-adjustable support rod. The slide rail and the spring are installed on the support rod base. The support rod base is installed at the end of a section of the source guide tube entering the manhole. The telescopic rod is installed inside the slide rail, and the light source fixing device is installed at the end of the telescopic rod.

[0007] The flange is made of lightweight and high-hardness aluminum alloy plate. The overall structure is rectangular, with a through hole in the center for the source tube to pass through, four observation windows around the center, threaded holes for installing various components in other positions, and clearance holes for fastening bolts on a set of diagonal holes. The flange has a reinforcing rib structure, and the blank area of ​​the panel formed by the reinforcing ribs is thinned.

[0008] The unthreaded front end of the locating bolt screw has a taper.

[0009] The bolt head of the fastening bolt is knurled and the front end of the screw is tapered.

[0010] The guide column is a rotatable nylon cylinder, which is installed in a group of 8 on one side of the flange manhole. It is arranged in an array according to the center circumference of the flange. Its position and size are based on the inner diameter of the manhole. After installation, the outer side of the guide column is close to the inner wall of the manhole.

[0011] The mounting handle is cylindrical.

[0012] A total of three groups of support rod mechanisms are installed on the slide rail through a fixed seat and a sliding seat.

[0013] Before installation, first insert the source tube into the source guide tube through the center hole of the flange, and send the head of the source tube to the light source fixing device for fixing; turn the rocking handle clockwise to open the support rod mechanism, confirm the number of turns when the support rod mechanism is opened to the maximum position, and then retract the support rod mechanism.

[0014] During installation, the support rod mechanism should be in the unopened state and must be completed by two people. One person holds the installation handle to control the whole body, and the other person holds the guide tube for assistance. The assistant slowly inserts the guide tube into the manhole. The person holding the flange plate uses the fixed positioning bolts to align the flange plate with the threaded holes on the manhole flange surface when approaching the manhole flange surface, and slowly fits the flange plate to the manhole flange surface. Then the assistant uses two fastening bolts to pre-tighten and adjust the flange plate state. Then tighten the two fastening bolts to fix the flange plate on the manhole flange surface; turn the rocking handle to open the support rod mechanism so that the light source fixture is positioned at the center of the weld to be inspected; adjust the telescopic rod, adjust the telescopic rod to a fully retracted state when checking the weld between the steam generator pipe and the safety end, and adjust the telescopic rod to a fully extended state when checking the weld between the safety end of the steam generator pipe and the main pipeline to complete the installation.

[0015] When disassembling, first turn the shaking handle counterclockwise to retract the support rod mechanism. The number of shaking circles is the same as when opening. One person holds the installation handle to control the whole device, and the assistant removes the fastening bolts. The person holding the device slowly pulls out the whole device, and the assistant supports the source pipe to prevent it from hitting the inner wall of the evaporator water chamber.

[0016] The beneficial effects achieved by the present invention are:

[0017] The main positioning component is made of a new high-strength lightweight aluminum alloy, and some concentrated force components are made of stainless steel. The flange is thinned and reinforced with ribs, which greatly reduces the weight while ensuring strength; the positioning bolts on the flange are easy to align the flange installation position; the fastening bolt screw is taper-processed; this design greatly reduces the force on personnel during installation, ensures fast and accurate positioning of the device during installation, makes installation labor-saving, convenient and fast, thereby reducing personnel dose and saving a lot of time. The overall structure is convenient, smart and reliable, and all operations are performed outside the manhole, ensuring the radiation protection requirements, easy installation and disassembly, and meeting relevant design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the welding seam detection device for connecting the steam generator pipe and the main pipeline of a nuclear power plant;

[0019] Figure 2 Schematic diagram of the flange plate of the welding seam detection device connecting the nuclear power plant steam generator pipe and the main pipeline (direction of the installation handle);

[0020] Figure 3 Schematic diagram of the flange plate of the welding seam detection device for connecting the nuclear power plant steam generator pipe to the main pipeline (mounting seat direction);

[0021] Figure 4 This is a schematic diagram of the installation and use of the welding seam detection device for connecting the steam generator pipe to the main pipeline of a nuclear power plant;

[0022] In the figure: 1 is a flange; 2 is a positioning bolt; 3 is a fastening bolt; 4 is a guide column; 5 is a source guide tube; 6 is a mounting seat; 7 is a flange handle; 8 is a mounting handle; 9 is a base; 10 is a worm gear; 11 is a worm; 12 is a shaking handle; 13 is a wire positioning block; 14 is a steel wire; 15 is a fixed pulley; 16 is an adjustable support rod; 17 is a non-adjustable support rod; 18 is a guide wheel; 19 is a fixed seat; 20 is a sliding seat; 21 is a slide rail; 22 is a spring; 23 is a support rod base; 24 is a telescopic rod; 25 is a light source fixing device. DETAILED DESCRIPTION

[0023] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1 As shown, a device for detecting the weld between a nuclear power plant steam generator pipe and a main pipeline comprises: a positioning assembly, a driving assembly, a strut assembly, and a telescopic assembly, wherein the driving assembly, the strut assembly, and the telescopic assembly are respectively installed on the positioning assembly.

[0025] The positioning assembly includes a flange 1, a positioning bolt 2, a fastening bolt 3, a guide column 4, a source guide tube 5, a mounting seat 6, a flange handle 7, and a mounting handle 8.

[0026] The flange 1 is made of a lightweight and high-hardness aluminum alloy plate. The overall structure is rectangular. A through hole for passing the source tube is opened in the center. Four observation windows are opened around the center. Threaded holes for installing various components are opened in other positions. A set of clearance holes for fastening bolt installation is opened on the diagonal. The flange 1 is made of a reinforcing rib structure, and the holes on the connecting panel are improved to improve the overall strength. The blank area of ​​the panel formed by the reinforcing rib is thinned to reduce the overall weight of the panel. The positioning bolt 2 is a bolt slightly smaller than the size of the threaded hole of the manhole. It is directly installed on the flange. The position size corresponds to the size of the flange surface of the manhole. The front end of the screw without thread has a taper for easy installation. The fastening bolt 3 is a bolt that matches the size of the threaded hole of the manhole. The bolt head is knurled and the front end of the screw has a taper for easy installation. The guide column 4 is a rotatable nylon cylinder. A group of 8 is installed on one side of the manhole of the flange 1. It is arranged in an array according to the central circumference of the flange. Its position size is based on the inner diameter of the manhole. After installation, the outer side of the guide column is close to the inner wall of the manhole. The source guide pipe 5 is bent, and one end of the source guide pipe 5 extends into the interior of the steam generator through the manhole of the steam generator, and the other end is positioned and installed on the manhole side of the flange 1 using a mounting seat 6. A wire positioning block 13 is installed on the source guide pipe 5. The flange handle 7 is symmetrically installed on the non-manhole side of the flange 1 by screws. The mounting handle 8 is cylindrical and symmetrically fixed on the non-manhole side of the flange 1.

[0027] The driving assembly includes a base 9, a worm wheel 10, a worm 11, a rocking handle 12, a wire positioning block 13, a wire 14, and a fixed pulley 15. The worm wheel 10 and the worm 11 form a worm gear mechanism installed on the base 9, and the rocking handle 12 is connected to the worm gear mechanism and installed on the flange 1 through the base 9. The worm wheel 10 has a wire fixing and winding structure, and the movement of the wire 14 is realized by the rotation of the worm wheel 10. The wire positioning blocks 13 are installed on both sides of the source guide tube 5 and are evenly distributed to achieve the fixation of the wire 14 over a long distance. The fixed pulley 15 is installed at the specified position of the slide rail 21 and is symmetrically installed on both sides to achieve the conversion of the movement direction of the wire 14. One end of the wire 14 is connected to the worm wheel, and the other end is connected to the strut assembly, and the position of the wire is limited by the wire positioning block 13.

[0028] The support rod assembly includes an adjustable support rod 16, a non-adjustable support rod 17, a guide wheel 18, a fixed seat 19, a sliding seat 20, a slide rail 21, a spring 22, and a support rod base 23. The adjustable support rod 16 and the non-adjustable support rod 17 are connected at the center to form a group of support rod mechanisms, and a total of three groups of support rod mechanisms are installed on the slide rail through the fixed seat 19 and the sliding seat 20. The guide wheel 18 is connected to the top of the adjustable support rod 16 and the non-adjustable support rod 17. The slide rail 21 and the spring 22 are installed on the support rod base 23, and the support rod base 23 is installed at the end of the source guide pipe 5 entering the manhole.

[0029] The telescopic assembly includes a slide rail 21, a telescopic rod 24, and a light source fixing device 25. The telescopic rod 24 is installed inside the slide rail 21 and can be telescopically slidable to achieve the change of the axial position of the source. The light source fixing device 25 is installed at the end of the telescopic rod 24 to fix the light source.

[0030] Before installation, first insert the source tube into the source guide tube through the center hole of the flange, and send the head of the source tube to the light source fixing device for fixing; turn the rocking handle clockwise to open the support rod mechanism, confirm the number of turns when the support rod mechanism is opened to the maximum position, and then retract the support rod mechanism.

[0031] During installation, the support rod mechanism should be in the unopened state and should be completed by two people. One person holds the installation handle to control the whole, and the other person holds the guide tube for assistance. The assistant slowly inserts the guide tube into the manhole.

[0032] When the operator holds the flange and approaches the manhole flange surface, he uses the fixed positioning bolts to align the flange with the threaded holes on the manhole flange surface, and slowly fits the flange against the manhole flange surface. Then the assistant uses two fastening bolts to pre-tighten and adjust the flange state. Then, he tightens the two fastening bolts to fix the flange on the manhole flange surface; turns the rocking handle to open the support rod mechanism to position the light source fixture at the center of the weld to be inspected; adjust the telescopic rod to a fully retracted state when inspecting the weld between the steam generator pipe and the safety end; adjust the telescopic rod to a fully extended state when inspecting the weld between the safety end of the steam generator pipe and the main pipeline to complete the installation.

[0033] When disassembling, first turn the shaking handle counterclockwise to retract the support rod mechanism. The number of shaking circles is the same as when opening. One person holds the installation handle to control the whole device, and the assistant removes the fastening bolts. The person holding the device slowly pulls out the whole device, and the assistant supports the source pipe to prevent it from hitting the inner wall of the evaporator water chamber.

[0034] The present invention is made of lightweight and high-hardness aluminum alloy and a small amount of stainless steel. The overall structure is convenient, smart and reliable. All operations can be performed outside the manhole, ensuring the radiation protection requirements. It is easy to install and disassemble, meeting relevant design requirements. The position and design of the positioning bolts of the flange ensure fast and accurate positioning during installation.

Claims

1. A device for detecting the weld seam between the connecting pipe of a nuclear power plant steam generator and the main pipeline, characterized in that: The positioning bolts are installed on the flange, the fastening bolts are installed on the flange, the guide column is installed on one side of the flange manhole, the source guide pipe is bent, one end of which extends into the interior of the steam generator through the manhole of the steam generator, and the other end is positioned and installed on the manhole side of the flange using a mounting seat, the flange handle is symmetrically installed on the non-manhole side of the flange by screws, the mounting handle is symmetrically fixed on the non-manhole side of the flange, the worm gear and worm mechanism are installed on the base, the shaking handle is connected to the worm gear mechanism and is installed on the flange through the base, the worm wheel has a wire fixing and winding structure, and the movement of the wire is rotated by the worm wheel The rotation is realized, and the wire positioning blocks are evenly distributed on both sides of the source guide tube, and the fixed pulleys are symmetrically installed at the specified positions on both sides of the slide rail. One end of the steel wire is connected to the worm gear, and the other end is connected to the support rod base. The position of the steel wire is limited by the wire positioning block. The adjustable support rod and the non-adjustable support rod are centrally connected to form a group of support rod mechanisms. The support rod mechanism is installed on the slide rail through a fixed seat and a sliding seat. The guide wheel is connected to the top of the adjustable support rod and the non-adjustable support rod. The slide rail and the spring are installed on the support rod base. The support rod base is installed at the end of a section of the source guide tube entering the manhole. The telescopic rod is installed inside the slide rail, and the light source fixing device is installed at the end of the telescopic rod.

2. The device for detecting the weld seam between the connecting pipe of the steam generator of a nuclear power plant and the main pipeline according to claim 1 is characterized in that: The flange is made of lightweight and high-hardness aluminum alloy plate. The overall structure is rectangular, with a through hole in the center for the source tube to pass through, four observation windows around the center, threaded holes for installing various components in other positions, and clearance holes for fastening bolts on a set of diagonal holes. The flange has a reinforcing rib structure, and the blank area of ​​the panel formed by the reinforcing ribs is thinned.

3. The device for detecting the weld seam between the connecting pipe of the steam generator of a nuclear power plant and the main pipeline according to claim 1 is characterized in that: The unthreaded front end of the locating bolt screw has a taper.

4. The device for detecting the weld seam between the connecting pipe of the steam generator of a nuclear power plant and the main pipeline according to claim 1 is characterized in that: The bolt head of the fastening bolt is knurled and the front end of the screw is tapered.

5. The device for detecting the weld seam between the connecting pipe of the steam generator of a nuclear power plant and the main pipeline according to claim 1, characterized in that: The guide column is a rotatable nylon cylinder, which is installed in a group of 8 on one side of the flange manhole. It is arranged in an array according to the center circumference of the flange. Its position and size are based on the inner diameter of the manhole. After installation, the outer side of the guide column is close to the inner wall of the manhole.

6. The device for detecting the weld seam between the connecting pipe of the steam generator of a nuclear power plant and the main pipeline according to claim 1, characterized in that: The mounting handle is cylindrical.

7. The device for detecting the weld seam between the connecting pipe of the steam generator of a nuclear power plant and the main pipeline according to claim 1, characterized in that: A total of three groups of support rod mechanisms are installed on the slide rail through a fixed seat and a sliding seat.

8. The device for detecting the weld seam between the connecting pipe of the steam generator of a nuclear power plant and the main pipeline according to claim 1, characterized in that: Before installation, first insert the source tube into the source guide tube through the center hole of the flange, and send the head of the source tube to the light source fixing device for fixing; Turn the rocker handle clockwise to open the prop mechanism, confirm the number of turns when the prop mechanism is opened to the maximum position, and then retract the prop mechanism.

9. The device for detecting the weld seam between the connecting pipe of the steam generator of a nuclear power plant and the main pipeline according to claim 8, characterized in that: During installation, the support rod mechanism should be in the unopened state and must be completed by two people. One person holds the installation handle to control the whole body, and the other person holds the guide tube for assistance. The assistant slowly inserts the guide tube into the manhole. The person holding the flange plate uses the fixed positioning bolts to align the flange plate with the threaded holes on the manhole flange surface when approaching the manhole flange surface, and slowly fits the flange plate to the manhole flange surface. Then the assistant uses two fastening bolts to pre-tighten and adjust the flange plate state. Then tighten the two fastening bolts to fix the flange plate on the manhole flange surface; turn the rocking handle to open the support rod mechanism so that the light source fixture is positioned at the center of the weld to be inspected; adjust the telescopic rod, adjust the telescopic rod to a fully retracted state when checking the weld between the steam generator pipe and the safety end, and adjust the telescopic rod to a fully extended state when checking the weld between the safety end of the steam generator pipe and the main pipeline to complete the installation.

10. The device for detecting the weld seam between the connecting pipe of the steam generator of a nuclear power plant and the main pipeline according to claim 9, characterized in that: When disassembling, first turn the shaking handle counterclockwise to retract the support rod mechanism. The number of shaking circles is the same as when opening. One person holds the installation handle to control the whole device, and the assistant removes the fastening bolts. The person holding the device slowly pulls out the whole device, and the assistant supports the source pipe to prevent it from hitting the inner wall of the evaporator water chamber.

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