Nuclear power plant stop valve rod microcrack on-line detection device

Abstract

The utility model discloses a nuclear power plant stop valve rod microcrack on-line detection device which comprises a fixing assembly, a rotating piece, a detection assembly and an adjusting assembly. The fixing assembly is arranged on the outer surface of a stop valve rod in a sleeving mode and can do lifting motion along the central axis of the stop valve rod; the rotating part is connected to the fixing assembly and can rotate relative to the fixing assembly, the detection assembly comprises a detection support connected to the rotating part and a probe detachably connected with the detection support, the probe can rotate around the central axis of a valve rod of the stop valve under the driving of the rotating part, and the adjusting assembly is connected to the fixing assembly and can adjust the position of the valve rod of the stop valve. And the distance between the probe and the outer surface of the valve rod of the stop valve can be adjusted. The nuclear power plant stop valve rod microcrack on-line detection device can effectively improve the detection quality of the surface of the stop valve rod, so that the stop valve rod microcrack detection can be carried out under the condition that the valve is not disassembled and assembled, and the stop valve rod microcrack on-line detection efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of nuclear power plant stop valve stem micro-crack aging detection, in particular to a nuclear power plant stop valve stem micro-crack online detection device. Background Art

[0002] The stop valve of a nuclear power plant is a forced sealing valve. By applying torque to the valve stem, the valve stem applies pressure to the valve disc in the axial direction, so that the valve disc and the valve seat sealing surface fit closely, preventing the flow of medium, and realizing the functions of medium transportation, stop and regulation. Its sealing performance directly affects the safe and reliable operation of nuclear power plant equipment. Due to factors such as the material of the stop valve stem, improper heat treatment, stress concentration, pitting, intergranular corrosion, and overload during the valve opening and closing process, fracture events often occur, affecting the safe operation of nuclear power units.

[0003] At present, the inspection methods for micro-cracks on the stem of the stop valve in nuclear power plants mainly include visual inspection, dismantling and repair inspection, and replacement. Some power plants have begun to use phased array nondestructive testing methods to improve the efficiency of valve maintenance and replacement.

[0004] However, due to the large number of sizes and specifications of stop valve stems and the different types of valves, the surface space available for detection is limited during the detection process, making it impossible to fully carry out online detection of valve stem microcracks. For valve maintenance and replacement, the entire valve often needs to be disassembled and welding work is required, which is a large workload and consumes a lot of manpower and material resources. Therefore, in terms of valve stem microcrack detection, it is necessary to develop a special detection device equipped with a special development probe for online detection to reduce the workload of valve maintenance and replacement, reduce the risk of on-site operations of personnel, and improve the efficiency of valve stem detection.

[0005] The valve industry at home and abroad has carried out a lot of long-term work on valve stem micro-crack detection. For example, a nuclear power plant has developed a phased array full-focus detection method to solve the problem of stop valve stem fracture. The inspection method is to extract the valve stem for offline inspection. From the implementation effect, the phased array technology has a certain defect detection capability, but it cannot achieve online detection and cannot fundamentally reduce the workload of valve maintenance. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide an online detection device for micro-cracks of a stop valve stem of a nuclear power plant.

[0007] The technical solution adopted by the utility model to solve the technical problem is: construct an online detection device for micro-cracks of a stop valve stem of a nuclear power plant, which includes:

[0008] A fixing assembly, which is sleeved on the outer surface of the stop valve stem, and the fixing assembly can move up and down along the central axis of the stop valve stem;

[0009] A rotating member connected to the fixed component and capable of rotating relative to the fixed component;

[0010] A detection assembly, comprising a detection support connected to the rotating member and a probe detachably connected to the detection support, wherein the probe can rotate around the central axis of the stop valve stem under the drive of the rotating member;

[0011] The adjusting component is connected to the fixing component and can adjust the distance between the probe and the outer surface of the stop valve stem.

[0012] In some embodiments, the fixing assembly includes two connecting assemblies spaced apart along the height direction of the stop valve stem, each connecting assembly includes a first half-circle fixing ring and a second half-circle fixing ring, and the first half-circle fixing ring is connected to the second half-circle fixing ring to form an accommodating space for the stop valve stem to pass through.

[0013] In some embodiments, the adjustment assembly includes a first adjustment member and a second adjustment member, the first end of the first adjustment member and the first end of the second adjustment member are both connected to the first semi-circle fixing ring, the second end of the first adjustment member and the second end of the second adjustment member are both connected to the second semi-circle fixing ring, and the first adjustment member and the second adjustment member are symmetrically arranged with respect to the center plane of the first semi-circle fixing ring.

[0014] In some embodiments, the central axis of the first adjusting member and the central axis of the second adjusting member are both perpendicular to the central axis of the stop valve stem.

[0015] In some embodiments, both the first adjusting member and the second adjusting member are threadedly connected to the second semi-circumferential fixing ring.

[0016] In some embodiments, each of the first half-circle fixed rings is provided with a first rotation groove, and each of the second half-circle fixed rings is provided with a second rotation groove corresponding to the first rotation groove, the first rotation groove and the second rotation groove constitute a total rotation groove, and both ends of the rotating member are connected to guide columns installed in the total rotation groove.

[0017] In some embodiments, the first half-circumference fixing ring and the second half-circumference fixing ring are both magnets.

[0018] In some embodiments, an operating member is connected to a side of the detection support away from the stop valve stem; or a knob member is connected to a side of the rotating member away from the stop valve stem.

[0019] In some embodiments, the detection assembly further includes a wedge matching the size of the stop valve stem and a plurality of chips disposed in the probe, wherein the wedge is mounted on a side of the probe facing the stop valve stem, and the plurality of chips are arranged in a matrix.

[0020] In some embodiments, the nuclear power plant stop valve stem micro-crack online detection device further includes a control component, and the control component includes a signal processor communicatively connected to the probe and a display electrically connected to the signal processor.

[0021] The implementation of the utility model has the following beneficial effects: the on-line detection device for microcracks of the stop valve stem of a nuclear power plant can reduce or eliminate the vibration caused by the uneven surface of the stop valve stem by setting a fixed component, a rotating part, a detection support and an adjusting component, ensure the stability of the probe detection, effectively improve the detection quality of the stop valve stem surface, improve the detection range and detection area of ​​microcracks on the stop valve stem surface, achieve full coverage of the detection of microcracks on the stop valve stem, avoid the detection difficulties of different valve stem specifications and sizes, and enable the detection of microcracks on the stop valve stem to be carried out without disassembling the valve, and finally improve the efficiency of on-line detection of microcracks on the stop valve stem. At the same time, the phased array technology is combined with the actual on-site detection difficulties of the stop valve stem, and the circumferential movement of the rotating part is used to effectively avoid the missed detection caused by the manual operation of the probe, and the design of the adjusting component and the detection component can effectively ensure that the detection component is in effective contact with the detection surface of the stop valve stem, reduce the interference wave of the probe signal, and improve the detection efficiency and accuracy of the microcracks on the stop valve stem. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the utility model, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the utility model, and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0023] Figure 1 It is a three-dimensional structural schematic diagram of a nuclear power plant stop valve stem micro-crack online detection device in some embodiments of the utility model;

[0024] Figure 2 It is a schematic diagram of the three-dimensional structure in another direction of the on-line detection device for micro-cracks of a stop valve stem of a nuclear power plant in some embodiments of the utility model;

[0025] Figure 3 It is a schematic diagram of the exploded parts of a device for online detection of micro-cracks in a stop valve stem of a nuclear power plant in some embodiments of the utility model. DETAILED DESCRIPTION

[0026] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "up", "down", "left", "right", "longitudinal", "horizontal", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc. are based on the directions or positional relationships shown in the accompanying drawings, are constructed and operated in a specific direction, and are only for the convenience of describing the present technical solution, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation to the present invention.

[0027] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. When an element is referred to as being "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or there may be one or more intermediate elements. The terms "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", "third", etc. can explicitly or implicitly include one or more of the features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0028] See also Figures 1 to 3, is an online detection device for micro-cracks of a stop valve stem of a nuclear power plant in some embodiments of the utility model, the online detection device for micro-cracks of a stop valve stem of a nuclear power plant specifically comprises a fixed component 1, a rotating component 2, a detection component 3 and an adjustment component 4, the fixed component 1 is sleeved on the outer surface of the stop valve stem 5, the fixed component 1 can do lifting and lowering movement along the central axis of the stop valve stem 5, so that the fixed component 1 can adjust the height direction of the stop valve stem 5 according to the detection position; the rotating component 2 is connected to the fixed component 1, and can rotate relative to the fixed component 1 Movement, the rotating part 2 can drive the detection component 3 to perform circumferential microcrack scanning detection on the stop valve stem 5 to be detected; the detection component 3 includes a detection support 31 connected to the rotating part 2 and a probe detachably connected to the detection support 31, and the probe can rotate around the central axis of the stop valve stem 5 under the drive of the rotating part 2; the adjustment component 4 is connected to the fixed component 1, and can adjust the distance between the probe and the outer surface of the stop valve stem 5, so that the detection component 3 can fully contact the detection surface of the stop valve stem 5 to meet the detection requirements.

[0029] like Figure 3 As shown, the fixing assembly 1 includes two connecting assemblies spaced apart along the height direction of the stop valve stem 5, each connecting assembly includes a first half-circle fixing ring 11 and a second half-circle fixing ring 12, and the first half-circle fixing ring 11 and the second half-circle fixing ring 12 are connected to form an accommodating space for the stop valve stem 5 to pass through. The arrangement of the two connecting assemblies makes the positioning and installation of the rotating member 2 and the detection assembly 3 more accurate and stable.

[0030] Preferably, the first half-circle fixing ring 11 and the second half-circle fixing ring 12 are both magnets, and the first half-circle fixing ring 11 and the second half-circle fixing ring 12 are fixed on the outer surface of the stop valve stem 5 by magnetic force. The setting that the first half-circle fixing ring 11 and the second half-circle fixing ring 12 are both magnets also facilitates the movement of the entire fixing assembly 1, which is beneficial to the installation of the rotating part 2.

[0031] Furthermore, the adjustment assembly 4 includes a first adjustment member 41 and a second adjustment member 42, the first end of the first adjustment member 41 and the first end of the second adjustment member 42 are both connected to the first half-circle fixed ring 11, the second end of the first adjustment member 41 and the second end of the second adjustment member 42 are both connected to the second half-circle fixed ring 12, and the first adjustment member 41 and the second adjustment member 42 are symmetrically arranged about the center plane of the first half-circle fixed ring 11. In this embodiment, the first adjusting member 41 and the second adjusting member 42 are both bolts, and the first adjusting member 41 and the second adjusting member 42 are both threadedly connected to the second semi-circular fixing ring 12. The first adjusting member 41 and the second adjusting member 42 can connect the first semi-circular fixing ring 11 and the second semi-circular fixing ring 12 together. The central axis of the first adjusting member 41 and the central axis of the second adjusting member 42 are both perpendicular to the central axis of the stop valve stem 5, that is, the first adjusting member 41 and the second adjusting member 42 are both horizontally arranged with the first semi-circular fixing ring 11 or the second semi-circular fixing ring 12, which facilitates the on-site installation of the first semi-circular fixing ring 11 and the second semi-circular fixing ring 12.

[0032] The first adjusting member 41 and the second adjusting member 42 can simultaneously adjust the distance between the first half-circle fixing ring 11 and the second half-circle fixing ring 12, thereby adjusting the distance between the probe and the outer surface of the stop valve stem 5. The first adjusting member 41 and the second adjusting member 42 can be adjusted and fixed synchronously to ensure that the probe is in full contact with the outer surface of the stop valve stem 5, so as to ensure the accuracy and effectiveness of the detection. In addition, after installation, the first adjusting member 41 and the second adjusting member 42 do not protrude from the first half-circle fixing ring 11 or the second half-circle fixing ring 12, ensuring that there is enough space in the fixing assembly 1 to install the probe.

[0033] It can be understood that by setting the fixed component 1, the rotating part 2, the detection support 31 and the adjustment component 4, the vibration caused by the uneven surface of the stop valve stem 5 can be reduced or eliminated, thereby ensuring the stability of the probe detection, effectively improving the detection quality of the surface of the stop valve stem 5, and ultimately improving the efficiency of online detection of microcracks in the stop valve stem 5.

[0034] In addition, each first half-circle fixed ring 11 is provided with a first rotation groove 111, and each second half-circle fixed ring 12 is provided with a second rotation groove 121 corresponding to the first rotation groove 111. The first rotation groove 111 and the second rotation groove 121 form a total rotation groove, and both ends of the rotating member 2 are connected with guide posts 21 installed in the total rotation groove. In this embodiment, the guide posts 21 are located at both ends of the rotating member 2, and two guide posts 21 are respectively provided at the upper and lower ends of the rotating member 2, so that the rotating member 2 can rotate around the central axis of the stop valve stem 5 in the total rotation groove, so that the probe can also rotate around the central axis of the stop valve stem 5 for circumferential detection.

[0035] The side of the detection support 31 away from the stop valve stem 5 is connected to an operating member 311, or the side of the rotating member 2 away from the stop valve stem 5 is connected to a knob member. The setting of the operating member 311 or the knob member can facilitate the operator to rotate the probe, and the operating member 311 or the knob member can also be connected with an electric tool for convenient rotation. The rotating member 2 drives the probe to perform circumferential scanning detection on the stop valve stem 5, and the online detection of micro cracks in the stop valve stem 5 can be completed at one time.

[0036] In addition, the detection assembly 3 also includes a wedge block that matches the size of the stop valve stem 5 and a plurality of wafers arranged in the probe, the wedge block is installed on the side of the probe facing the stop valve stem 5, and the plurality of wafers are arranged in a matrix. It can be understood that since the detection requirements of different stop valve stem 5 sizes and specifications need to be met, the wedge block is set according to the size and specification of the stop valve stem 5, and the wedge block can have a variety of different curved surface angles. During the detection, the surface of the wedge block is consistent with the curved surface angle of the outer surface of the stop valve stem 5.

[0037] In actual operation, when performing micro-crack detection of the stop valve stem 5, different fixing components 1 and matching probes and wedges are selected according to the different specifications and sizes of the stop valve stem 5. Under the action of the adjustment component 4, the surface of the wedge is made to fit the detected surface of the stop valve stem 5 to avoid the ultrasonic signal being unable to pass through the surface of the stop valve stem 5 being detected or the ultrasonic energy being insufficient, resulting in the phenomenon of being unable to detect. When a crack defect of the stop valve stem 5 is found during the detection process, the defect position can be determined according to the actual situation, the rotation angle of the rotating part 2 and the detection distance of the probe, and finally the qualitative and quantitative evaluation of the defect can be carried out.

[0038] The chip installed in the probe mainly converts electrical energy and acoustic energy into each other. Multiple chips are arranged in a matrix to transmit and receive ultrasonic waves during the detection process, and the piezoelectric effect of the material is used to realize the conversion of electrical energy and acoustic energy.

[0039] The on-line detection device for micro-cracks in the stem of a stop valve in a nuclear power plant also includes a control component, which includes a signal processor communicatively connected to the probe and a display electrically connected to the signal processor. The probe can send an image signal to the signal processor, and the image is displayed on the display after processing by the signal processor, thereby realizing the function of on-line detection and display of micro-cracks through this display.

[0040] In summary, the on-line detection device for microcracks of the stop valve stem of a nuclear power plant can reduce or eliminate the vibration caused by the uneven surface of the stop valve stem 5 by setting a fixed component 1, a rotating part 2, a detection support 31 and an adjusting component 4, thereby ensuring the stability of the probe detection, effectively improving the detection quality of the surface of the stop valve stem 5, improving the detection range and detection area of ​​the microcracks on the surface of the stop valve stem 5, achieving full coverage of the microcrack detection of the stop valve stem 5, avoiding the detection difficulties of different valve stem specifications and sizes, and enabling the microcrack detection of the stop valve stem 5 to be performed without disassembling the valve, and ultimately improving the efficiency of the on-line detection of microcracks of the stop valve stem 5. At the same time, the phased array technology is combined with the actual on-site detection difficulties of the stop valve stem 5, and the circumferential movement of the rotating part 2 is used to effectively avoid the missed detection caused by the manual operation of the probe, and the design of the adjusting component 4 and the detection component 3 can effectively ensure that the detection component 3 is in effective contact with the detection surface of the stop valve stem 5, reduce the interference wave of the probe signal, and improve the detection efficiency and accuracy of the microcracks of the stop valve stem 5.

[0041] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should fall within the scope of the claims of the utility model.

Claims

1. An online detection device for micro-cracks on stems of stop valves in nuclear power plants, characterized in that: include: A fixing assembly (1) is sleeved on the outer surface of a stop valve stem (5), and the fixing assembly (1) is capable of performing lifting and lowering motion along the central axis of the stop valve stem (5); A rotating member (2) connected to the fixed component (1) and capable of rotating relative to the fixed component (1); A detection assembly (3), comprising a detection support (31) connected to the rotating member (2) and a probe detachably connected to the detection support (31), wherein the probe is capable of rotating around the central axis of the stop valve stem (5) under the drive of the rotating member (2); An adjusting component (4) is connected to the fixing component (1) and is capable of adjusting the distance between the probe and the outer surface of the stop valve stem (5).

2. The on-line detection device for micro-cracks of stop valve stems of nuclear power plants according to claim 1 is characterized in that: The fixing assembly (1) comprises two connection assemblies spaced apart in the height direction of the stop valve stem (5), each connection assembly comprising a first half-circle fixing ring (11) and a second half-circle fixing ring (12), and the first half-circle fixing ring (11) and the second half-circle fixing ring (12) are connected to form an accommodation space for the stop valve stem (5) to pass through.

3. The on-line detection device for micro-cracks of stop valve stems of nuclear power plants according to claim 2 is characterized in that: The adjustment component (4) comprises a first adjustment member (41) and a second adjustment member (42); the first end of the first adjustment member (41) and the first end of the second adjustment member (42) are both connected to the first semi-circular fixing ring (11); the second end of the first adjustment member (41) and the second end of the second adjustment member (42) are both connected to the second semi-circular fixing ring (12); the first adjustment member (41) and the second adjustment member (42) are symmetrically arranged with respect to the center plane of the first semi-circular fixing ring (11).

4. The on-line detection device for micro-cracks of stop valve stems of nuclear power plants according to claim 3 is characterized in that: The central axis of the first adjusting member (41) and the central axis of the second adjusting member (42) are both perpendicular to the central axis of the stop valve stem (5).

5. The on-line detection device for micro-cracks of stop valve stems of nuclear power plants according to claim 3 is characterized in that: The first adjusting member (41) and the second adjusting member (42) are both threadedly connected to the second semi-circumferential fixing ring (12).

6. The on-line detection device for micro-cracks of stop valve stems of nuclear power plants according to claim 2, characterized in that: Each of the first half-circle fixed rings (11) is provided with a first rotation groove (111), and each of the second half-circle fixed rings (12) is provided with a second rotation groove (121) corresponding to the first rotation groove (111), the first rotation groove (111) and the second rotation groove (121) form a total rotation groove, and both ends of the rotating member (2) are connected to guide columns (21) installed in the total rotation groove.

7. The on-line detection device for micro-cracks of stop valve stems of nuclear power plants according to claim 2, characterized in that: The first half-circle fixing ring (11) and the second half-circle fixing ring (12) are both magnets.

8. The on-line detection device for micro-cracks of stop valve stems in nuclear power plants according to claim 1, characterized in that: The side of the detection support (31) away from the stop valve stem (5) is connected to an operating member (311); or the side of the rotating member (2) away from the stop valve stem (5) is connected to a knob member.

9. The on-line detection device for micro-cracks of stop valve stems of nuclear power plants according to claim 1, characterized in that: The detection assembly (3) further comprises a wedge block having a size matching that of the stop valve stem (5) and a plurality of chips arranged in the probe, wherein the wedge block is mounted on a side of the probe facing the stop valve stem (5), and the plurality of chips are arranged in a matrix.

10. The on-line detection device for micro-cracks of stop valve stems in nuclear power plants according to claim 1, characterized in that: The on-line detection device for micro-cracks of a stop valve stem in a nuclear power plant further comprises a control component, wherein the control component comprises a signal processor communicatively connected to the probe and a display electrically connected to the signal processor.

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