A bolt detection probe assembly for the containment of a nuclear power plant

Abstract

The present invention relates to a detection probe assembly for the enclosure bolts of a nuclear power plant, comprising: a probe, a driving mechanism and a flexible connection mechanism. The driving mechanism drives the probe to achieve translation and rotation. The flexible connection mechanism includes a movable seat, a fixed seat, a guide post and an elastic member. The fixed seat is fixedly connected to the driving mechanism, and the movable seat is fixedly connected to the probe. The movable seat is provided with a through hole. The guide post includes a guiding section and a connecting section. The guiding section is located in the through hole, and there is a gap between the guiding section and the through hole, so that the movable seat can swing relative to the fixed seat. The connecting section is fixedly connected to the fixed seat, and the movable seat can reciprocally slide relative to the fixed seat along a first direction through the guide post. The elastic member is located between the movable seat and the fixed seat, and the elastic member is used to adjust the distance between the fixed seat and the movable seat. The presence of the flexible connection mechanism can reduce the probability of probe damage, and at the same time, it can achieve self-adaptive and rapid centering and abutment between the probe and the head of the enclosure bolt, thus saving inspection time and manpower.

Description

Technical Field

[0001] The present invention relates to the technical field of non-destructive testing of bolts in nuclear power plants, and particularly to a detection probe assembly for the bolts of the containment plate in a nuclear power plant. Background Art

[0002] The containment plate assembly in a nuclear power plant is an important component of the reactor core, used to enclose the nuclear fuel assembly. Its working environment is complex, including high temperature, high pressure, strong neutron irradiation and vibration. After long-term operation, the containment plate bolts, as fasteners, are prone to irradiation stress corrosion cracks and cause damage. The damaged containment plate bolts will lead to the loosening of the connection of the containment plate, reducing the overall stiffness of the containment plate assembly. Under the impact of the primary coolant, the loosened containment plate assembly will pose a hazard to the nuclear fuel assembly. Therefore, regular maintenance and inspection are required.

[0003] Currently, the prior art usually uses a probe rotation mechanism for inspection, that is, the probe is rotated to move to the containment plate bolt, and then connected to the head of the containment plate bolt. Since the angle of the head cannot be determined after the containment plate bolt is installed, the probe needs to be rotated specifically to align with the head. During the rotation and movement process, it is very easy to collide with the containment plate, resulting in the probe being impacted, and the probe or the driving mechanism is easily damaged.

[0004] Currently, the prior art inspections of the containment plate bolts all require the user to carefully observe the distance between the probe and the containment plate to prevent the probe from colliding with the containment plate due to excessive movement of the probe, resulting in damage to the probe or a relatively large impact on the power system or transmission system. In this case, the probe not only has the risk of damage, but also due to the large alignment difficulty, the entire inspection process takes a long time. Summary of the Invention

[0005] Based on this, in view of the problems of a high probability of probe damage and a long inspection process, it is necessary to provide a probe driving and centering mechanism that does not require the user to observe carefully and is not easily damaged by the probe, so as to shorten the inspection time.

[0006] The present application provides a detection probe assembly for the bolts of the containment plate in a nuclear power plant, used to detect the head of the containment plate bolt, and is characterized by including:

[0007] A probe;

[0008] A driving mechanism;

[0009] A flexible connection mechanism, the driving mechanism is connected to the probe through the flexible connection mechanism to drive the probe to achieve translation in space and rotation around the first direction;

[0010] The flexible connection mechanism includes a movable seat, a fixed seat, a guide column and an elastic member. The fixed seat is fixedly connected to the driving mechanism, and the movable seat is fixedly connected to the probe. One of the movable seat and the fixed seat is provided with a through hole, and the other has a fixed position. The guide column includes a guide section and a connecting section. The guide section is located in the through hole. A gap is provided between the guide section and the through hole so that the movable seat can swing relative to the fixed seat in the gap; one end of the connecting section away from the guide section is fixedly connected to the fixed position, and the movable seat can slide back and forth in a first direction relative to the fixed seat through the guide column; the elastic member is located between the movable seat and the fixed seat, and the elastic member is used to adjust the distance between the fixed seat and the movable seat;

[0011] The first direction is the axial direction of the probe.

[0012] In one embodiment, the movable seat is provided with a through hole, the fixed seat is provided with a fixed position, and the guide post is fixedly connected to the fixed seat.

[0013] In one embodiment, the elastic member is a coil spring, which is sleeved on the guide post and is used to drive the movable seat and the fixed seat to move relatively away from each other.

[0014] In one embodiment, a plurality of guide posts are arranged at intervals along the circumference of the probe, and a plurality of coil springs are sleeved on the plurality of guide posts in a one-to-one correspondence.

[0015] In one embodiment, the through hole extends along a first direction, and the aperture of the through hole gradually decreases along the first direction away from the probe, and the diameter of the guide section gradually decreases synchronously to limit the movable seat from escaping from the guide post in the first direction.

[0016] In one embodiment, a guide centering sleeve is further included, which includes a protective section and a fixed section. The fixed section is sleeved on the front end of the probe and fixedly connected to the probe. The protective section extends from the probe along a first direction to wrap the probe.

[0017] In one embodiment, a channel is provided in the protection section, and a projection shape of the channel along the first direction is the same as a shape of a head of the enclosure bolt so as to match the head, and the probe can be connected to the head through the channel.

[0018] In one embodiment, the guide centering sleeve further includes a transverse groove, which is arranged along the diameter direction of the protection segment and passes through the protection segment, and the protection segment includes a first protection segment and a second protection segment on both sides of the transverse groove.

[0019] In one embodiment, both ends of the first protection segment and the second protection segment along their respective circumferential directions are provided with chamfers, and along the first direction away from the probe, the distance between the first protection segment and the second protection segment gradually decreases to the width of the transverse groove.

[0020] In one embodiment, the driving mechanism includes a reduction motor and a transmission system, wherein the reduction motor is used to provide power for translation and rotation of the probe, and the transmission system is used to transmit the torque of the reduction motor and output it as translation and rotation motion of the probe.

[0021] The above-mentioned nuclear power plant coaming bolt detection probe assembly comprises: a probe, a driving mechanism and a flexible connecting mechanism, the driving mechanism is connected to the probe through the flexible connecting mechanism to drive the probe to achieve translation in space and rotation around a first direction, wherein the first direction is the axial direction of the probe; the flexible connecting mechanism comprises a movable seat, a fixed seat, a guide column and an elastic member, the fixed seat is fixedly connected to the driving mechanism, the movable seat is fixedly connected to the probe, one of the movable seat and the fixed seat is provided with a through hole, and the other has a fixed position, the guide column comprises a guide section and a connecting section, the guide section is located in the through hole, and a gap is provided between the guide section and the through hole so that the movable seat can swing relative to the fixed seat; one end of the connecting section away from the guide section is fixedly connected to the fixed position, and the movable seat can slide back and forth along the first direction relative to the fixed seat through the guide column; the elastic member is located between the movable seat and the fixed seat, and the elastic member is used to adjust the distance between the fixed seat and the movable seat;

[0022] Due to the flexible connection mechanism, the distance between the probe and the drive mechanism along the first direction can be elastically adjusted. When the user maneuvers the probe close to the coaming bolt, regardless of whether the head is found, the probe will directly contact and collide with the coaming bolt, pressing the probe against the coaming. Because the movable seat can slide relative to the fixed seat in the first direction, the distance between the movable seat and the fixed seat decreases, compressing the elastic member, thereby absorbing the impact force on the probe and preventing damage to the probe and the drive mechanism. The probe continues to translate and rotate. When the axis and orientation of the probe and the coaming bolt head are substantially aligned, the flexible connection mechanism allows the probe to oscillate to a certain extent. At this time, the probe oscillates and rotates relative to the fixed seat in a direction perpendicular to the first direction within the gap, allowing the probe to align with the coaming bolt head more quickly and easily with less impact. When the probe finds the indented head, the elastic member drives the movable seat forward to compensate for the indented head, thereby driving the probe into the indented area and connecting with the coaming bolt head. The flexible connection mechanism prevents inelastic collision between the probe and the coaming, preventing damage to the probe.

[0023] During operation, first drive the probe forward. The probe contacts the apron plate, the elastic member is compressed, and the probe is pressed against the apron plate. Then, translate and rotate the probe vertically, horizontally, and rotationally. When the axis and orientation of the probe are basically aligned with the head of the apron bolt, under the pushing action of the elastic member of the flexible connection mechanism and with a clearance existing between the guide post and the through-hole of the movable seat, it is easier to achieve the adaptive alignment and stable and reliable abutment of the probe with the head of the apron bolt. At the same time, the user does not need to carefully drive the probe to prevent it from colliding with the apron plate. The flexible connection mechanism will automatically adjust the matching connection between the probe and the head of the apron bolt, so the inspection time is saved and manpower is saved. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of an embodiment of the present application;

[0025] Figure 2 is a schematic structural diagram of the flexible connection mechanism and the guiding and centering sleeve;

[0026] Figure 3 is Figure 1 a side perspective view of the flexible connection mechanism in the embodiment;

[0027] Figure 4 is a schematic side connection diagram of the movable seat and the guide post in another embodiment;

[0028] Figure 5 is a schematic structural diagram of the guiding and centering sleeve;

[0029] Figure 6 is a schematic structural diagram of the apron bolt.

[0030] Reference numerals: probe 110; drive mechanism 120; flexible connection mechanism 130; movable seat 131; fixed seat 132; guide post 133; guiding section 1331, connecting section 1332; helical spring 134; outer shell 135; guiding and centering sleeve 140; protective section 141; first protective section 1411; second protective section 1412; fixed section 142; transverse groove 143; apron bolt 200. Detailed Embodiment

[0031] To make the above objects, features, and advantages of the present invention more apparent and understandable, the following describes the specific embodiments of the present invention in detail with reference to the drawings. Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0032] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0033] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0034] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "connected to", "fixed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0037] The present application provides a containment bolt detection probe assembly for detecting the containment bolt 200. Refer to Figure 1 and Figure 2 , in one embodiment, Figure 1 shows the overall structure diagram of the containment bolt detection probe assembly, Figure 2 shows the specific structural schematic diagram of the flexible connection mechanism 130 therein. It includes: a probe 110, a driving mechanism 120 and a flexible connection mechanism 130. The driving mechanism 120 is connected to the probe 110 through the flexible connection mechanism 130 to drive the probe 110 to achieve translation in space and rotation around the first direction; wherein, the first direction is the axial direction of the probe 110. The flexible connection mechanism 130 includes a movable seat 131, a fixed seat 132, a guide post 133 and an elastic member. The fixed seat 132 is fixedly connected to the driving mechanism 120, the movable seat 131 is fixedly connected to the probe 110. One of the movable seat 131 and the fixed seat 132 is provided with a through hole, and the other has a fixed position. The guide post 133 includes a guiding section 1331 and a connecting section 1332. The guiding section 1331 is located in the through hole, and there is a gap between the guiding section 1331 and the through hole, so that the movable seat 131 can swing relative to the fixed seat 132 within the gap; the end of the connecting section 1332 away from the guiding section 1331 is fixedly connected to the fixed position of the fixed seat 132, and the movable seat 131 can reciprocally slide relative to the fixed seat 132 along the first direction through the guide post 133; the elastic member is located between the movable seat 131 and the fixed seat 132, and the elastic member is used to adjust the distance between the fixed seat 132 and the movable seat 131.

[0038] Refer to Figure 1 and Figure 2 , in one embodiment, the guide post 133 is fixedly connected to the fixed seat 132, the movable seat 131 is provided with a through hole, and the fixed seat 132 is provided with a fixed position.

[0039] Refer to Figure 1 and Figure 2 , in one embodiment, the probe assembly includes a probe 110, a driving mechanism 120 and a flexible connection mechanism 130. Wherein the probe 110 is generally cylindrical, and the probe 110 is used to detect whether there are defects inside the containment bolt 200. Refer to Figure 6 , Figure 6The schematic diagram of the shroud bolt 200 is shown. The driving mechanism 120 provides power for the probe 110, facilitating the movement of the probe 110 in space and its rotation along the first direction. A flexible connection mechanism 130 is provided between the driving mechanism 120 and the probe 110. The flexible connection mechanism 130 includes a movable seat 131, a fixed seat 132, a guide post 133 and an elastic member. Among them, both the movable seat 131 and the fixed seat 132 are disc-like structures and are arranged opposite to each other. The fixed seat 132 is fixedly connected to the driving mechanism 120, and the movable seat 131 is fixedly connected to the probe 110. The movable seat 131 is provided with a through hole, and the fixed seat 132 has a fixed position. Refer to Figure 3 , Figure 3 is a side perspective view of the flexible connection mechanism 130. From Figure 3 it can be seen that the guide post 133 includes a guiding section 1331 and a connecting section 1332. The guiding section 1331 and the connecting section 1332 are an integral structure. The guiding section 1331 is located in the through hole, and there is a gap between the guiding section 1331 and the through hole. The movable seat 131 can swing relative to the fixed seat 132 through the gap, thereby realizing the adaptive swing of the probe 110; one end of the connecting section 1332 away from the guiding section 1331 is fixedly connected to the fixed position on the fixed seat 132. The fixed position is an internal threaded hole on the fixed seat 132. In other embodiments, the fixed position can also be the welding joint between the fixed seat 132 and the connecting section 1332. The movable seat 131 can reciprocally slide relative to the fixed seat 132 along the first direction through the guide post 133; the elastic member is located between the movable seat 131 and the fixed seat 132, and the elastic member is used to adjust the distance between the fixed seat 132 and the movable seat 131.

[0040] From the above embodiments, the movement process of the detection probe assembly in the present application can be determined. Due to the presence of the flexible connection mechanism 130, the distance between the probe 110 and the fixed seat 132 or the subsequent driving mechanism in the first direction can be elastically adjusted. When the user manipulates the probe 110 to approach the gusset bolt 200, regardless of whether the head is found or not, the probe 110 can directly contact and collide with the gusset. The probe 110 will press on the gusset. Since the movable seat 131 can slide relative to the fixed seat 132 in the first direction, the distance between the movable seat 131 and the fixed seat 132 will become smaller at this time, and the elastic member is compressed, thereby absorbing the impact force received by the probe 110, and the probe 110 and the driving mechanism 120 are not easily damaged. The probe 110 continues to translate and rotate. When the axis and orientation of the head of the probe and the gusset bolt 200 are basically aligned, due to the presence of the elastic member and the gap, the probe 110 can swing to a certain extent. At this time, the probe 110 will swing, translate and rotate in the gap in the direction perpendicular to the first direction relative to the fixed seat 132. The probe 110 can align with the head of the gusset bolt 200 faster and more conveniently and receives less impact. When the probe 110 finds the sunken head, the elastic member will drive the movable seat 131 to move forward to make up for the sunken distance of the head, so as to realize that the movable seat 131 drives the probe 110 to extend into the sunken part and connect with the head of the gusset bolt 200. Due to the presence of the flexible connection mechanism 130, the probe 110 makes an inelastic collision with the gusset, and the probe 110 is not easily damaged. At the same time, the user does not need to carefully drive the probe 110 to prevent it from colliding with the gusset. The flexible connection mechanism 130 will automatically adjust the matching connection between the probe 110 and the head of the gusset bolt 200, so the inspection time is saved and the manpower is saved.

[0041] Similarly, in another embodiment, the fixed seat 132 may be provided with through holes, the movable seat 131 has a fixed position, and the connecting section 1331 and the guiding section 1332 of the guide post 133 are also correspondingly connected to the through holes and the fixed position respectively, and the same technical effects can be achieved as in the above embodiment.

[0042] Refer to Figure 2 , in one of the embodiments, the elastic member is a helical spring 134. The helical spring 134 is sleeved on the guide post 133, and the helical spring 134 is used to drive the movable seat 131 to move away from the fixed seat 132 relatively.

[0043] Refer to Figure 2, in one embodiment, a plurality of guide posts 133 are arranged at intervals along the circumferential direction of the probe 110, and a plurality of helical springs 134 are sleeved on the plurality of guide posts 133 one by one. Due to the existence of the gap, the stability of the connection is reduced to a certain extent. The provision of a plurality of guide posts 133 can enhance the connection strength between the movable seat 131 and the fixed seat 132, and balance the pulling force between the movable seat 131 and the fixed seat 132 after the movable seat 131 swings, avoiding uneven stress and affecting the service life.

[0044] Refer to Figure 2 , in one embodiment, the elastic member in the flexible connection mechanism 130 is a helical spring 134, and a plurality of them are provided. The plurality of helical springs 134 are sleeved on the guide posts 133. According to the length and elastic performance of the helical spring 134, multiple helical springs 134 can be sleeved on one guide post 133 instead of being limited to one. Compared with other elastic members, since the helical spring 134 is a standard part, the economic cost is relatively low, and the helical hollow feature determines that the helical spring 134 can be sleeved on the guide post 133. The guide post 133 itself can also limit the telescopic direction of the helical spring 134, preventing the helical spring 134 from telescoping in a direction other than the first direction and causing irreversible deformation.

[0045] In some other embodiments, limited by the shape of the guide post 133 or other functional requirements, other types of elastic members can be used. Even if the helical spring 134 is used, the two ends of the helical spring 134 can be separately connected to the movable seat 131 and the fixed seat 132 without being sleeved on the guide post 133.

[0046] Refer to Figure 3 , in one embodiment, the through hole extends along the first direction. Along the first direction away from the probe 110, the aperture of the through hole gradually decreases, and the diameter of the connecting section 1331 synchronously gradually decreases to limit the movable seat 131 from disengaging from the guide post 133 in the first direction.

[0047] Refer to Figure 3 , in one embodiment, the through hole penetrates the disc-shaped movable seat 131 along the first direction. The through hole of the movable seat 131 is frustum-shaped, and the connecting portion 1331 of the guide post 133 is also frustum-shaped and is arranged in the through hole. The through hole and the connecting portion 1331 face the driving mechanism 120 along the first direction, and the aperture of the through hole and the diameter of the connecting portion 1331 both decrease linearly. Since the guide post 133 and the movable seat 131 are movably connected, the frustum shape can not only enable the probe 110 to swing along the guide post 133 or the fixed seat 132, but also limit the movable seat 131 from disengaging from the guide post 133 in the first direction and thus losing the connection with the fixed seat 132.

[0048] Refer to Figure 4In one embodiment, the guide post 133 can be set in a T-shape as shown in the figure, and the diameter of the portion of the connecting section 1331 located in the through hole also needs to be significantly smaller than the aperture of the through hole. Regardless of this embodiment or the above embodiment, the way the guide post 133 is connected to the movable seat 131 is a physical spatial limitation rather than a mechanical freedom limitation.

[0049] See Figure 2 or Figure 3 , the flexible connection mechanism 130 further includes a housing 135, referring to Figure 1 It is not difficult to understand that the shell 135 is a hollow cylindrical shape, which wraps the elastic part, the guide column 133, a part of the fixed seat 132 and a part of the movable seat 131. The shell 135 can protect the guide column 133 and the elastic part from being damaged by external forces, and the shell 135 can improve the aesthetics of the detection device.

[0050] See Figure 2 or Figure 5 , Figure 5 A structural schematic diagram of the guide centering sleeve 140 is shown. In one embodiment, the guide centering sleeve 140 is further included. The guide centering sleeve 140 includes a protective section 141 and a fixed section 142. The fixed section 142 is sleeved on the probe 110 and fixedly connected to the probe 110. The protective section 141 extends from the probe 110 along a first direction to wrap the probe 110.

[0051] See Figure 2 or Figure 5 The guide centering sleeve 140 includes a protective section 141 and a fixed section 142. The fixed section 142 and the protective section 141 are an integrated structure. The fixed section 142 is sleeved on the probe 110 and fixedly connected to the probe 110. The end of the fixed section 142 away from the movable seat 131 is flush with the probe 110. The protective section 141 extends from the probe 110 along the first direction. Figure 5 As can be seen in the figure, the protective section 141 is hollow. The guide centering sleeve 140 has two functions. The first function is to protect the probe 110. During the centering connection between the probe 110 and the head of the panel bolt 200, it is the protective section 141, not the probe 110, that contacts the panel bolt 200, thereby protecting the probe 100 from collision. The second function is that the protective section 141 is hollow and can be firmly matched to the recessed part of the head of the panel bolt 200. When the probe 110 pressed on the panel is moved and rotated, after the axis and orientation of the guide centering sleeve 140 and the head of the panel bolt 200 are basically aligned, the hollow protective section 141 can be pressed into the recessed part by the coil spring 134 to complete the matching connection in the first place, and at the same time play a limiting role to prevent the probe 110 from being separated from the head of the panel bolt 200 again, thereby saving the operator's energy and time.

[0052] Refer to Figure 6 , Figure 6 which is a schematic view of the head of the bulkhead bolt 200. In one embodiment, a channel is provided in the protection section 141, and the projection shape of the channel in the first direction is the same as the shape of the head of the bulkhead bolt 200 for matching with the head of the bulkhead bolt 200, and the probe 110 can be connected to the head of the bulkhead bolt 200 through the channel.

[0053] Refer to Figure 6 , Figure 6 In, the head of the bulkhead bolt 200 is a sunken regular hexagon relative to the bulkhead surface. Therefore, in one embodiment, a channel is provided in the protection section 141, and the projection shape of the channel in the first direction is the same as the head shape for matching with the head, that is, the first protection section 1411 and the second protection section 1412 form an inner hexagon, which matches the outer hexagon of the head of the bulkhead bolt 200, and the probe 110 can be connected to the head of the bulkhead bolt 200 through the channel.

[0054] It can be understood that according to the specific shape presented by the head, it may be different, and the shape of the channel provided in the protection section 141 can be adjusted according to the shape of the head to achieve matching with the head.

[0055] Refer to Figure 5 , in one embodiment, the guiding and centering sleeve 140 further includes a transverse groove 143, and the transverse groove 143 is arranged along the diameter direction of the protection section 141 and penetrates through the protection section 141. The protection section 141 includes a first protection section 1411 and a second protection section 1412 on both sides of the transverse groove 143.

[0056] Refer to Figure 5 , in one embodiment, the guiding and centering sleeve 140 further includes a transverse groove 143. The protection section 141 is cut along the first direction, and the protection section 141 is divided into a first protection section 1411 and a second protection section 1412, where the first protection section 1411 and the second protection section 1412 are exactly the same in size and shape, and the two belong to a symmetric structure. Since the head of the bulkhead bolt 200 has a horizontally arranged locking rod protruding from the sunken part of the head, the arrangement of the transverse groove 143 facilitates matching with the locking rod.

[0057] Refer to Figure 5 , in one embodiment, chamfers are provided at both ends of the first protection section 1411 and the second protection section 1412 along their respective circumferences, and along the first direction away from the probe 110, the distance between the first protection section 1411 and the second protection section 1412 gradually decreases.

[0058] Refer to Figure 5, in one embodiment, chamfers are provided at both ends of the first protective section 1411 and the second protective section 1412 along their respective circumferences. Along the first direction away from the probe 110, the distance between the first protective section 1411 and the second protective section 1412 gradually decreases to the width of the transverse groove 143. Visually, the transverse groove 143 is "eight"-shaped open along the first direction, facilitating the centering, azimuth matching, and connection between the probe 110 and the head of the bulkhead bolt 200. Preferably, in the above embodiment, all four chamfers are 45° chamfers.

[0059] It can be understood that according to the recess depth of the bulkhead bolt 200 and the specific structure of the probe 110, the chamfer can be of other angles or be a rounded chamfer.

[0060] During operation, first drive the probe 110 forward so that the guiding and centering sleeve 140 contacts the bulkhead, the elastic member is compressed, and the guiding and centering sleeve 140 is pressed against the bulkhead. Then, translate and rotate the probe 110 vertically, horizontally, and rotationally. When the protective section 141 is basically aligned with the axis and azimuth of the head of the bulkhead bolt 200, under the pushing action of the elastic member of the flexible connection mechanism 130, with a gap between the guide post 133 and the through hole of the movable seat 131, and with chamfers provided on the first protective section 1411 and the second protective section, it is easier to achieve the adaptive centering and stable and reliable abutment between the probe 110 and the head of the bulkhead bolt 200.

[0061] Refer to Figure 1 , in one embodiment, the drive mechanism 120 includes a reduction motor and a transmission system. The reduction motor is used to provide power for the translation and rotation of the probe 110, and the transmission system is used to transmit the torque of the reduction motor and output it as the translational motion of the probe 110 in the horizontal, vertical, and front-back directions and the rotational motion around the first direction.

[0062] Refer to Figure 1 , in one embodiment, the drive mechanism 120 includes a reduction motor and a transmission system. Specifically, the horizontal drive mechanism is driven by a reduction motor, transmitted by a gear and rack, and guided by a guide rod to achieve the horizontal movement of the probe 110; the front-back drive mechanism is driven by a reduction motor and guided by a guide rail to achieve the front-back movement of the probe 110; the vertical drive mechanism is driven by a reduction motor, transmitted by a lead screw and a nut, and guided by a guide rail to achieve the up-and-down movement of the probe 110; the rotational drive mechanism is directly driven by a reduction motor to achieve the rotational movement of the ultrasonic probe 110. The probe 110 is directly connected to the rotational drive mechanism through the flexible connection mechanism 130.

[0063] It can be understood that in the above embodiment, the realization of translation in different directions is not limited to the transmission methods mentioned above. Since there are various types of mechanical transmissions with different advantages and disadvantages, according to different requirements, one can choose independently, which will not be elaborated here.

[0064] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0065] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A containment panel bolt detection probe assembly for detecting containment panel bolts (200), characterized in that, include: probe (110); a driving mechanism (120); a flexible connection mechanism (130), wherein the driving mechanism (120) is connected to the probe (110) via the flexible connection mechanism (130) to drive the probe (110) to achieve translation in space and rotation around a first direction; The flexible connection mechanism (130) includes a movable seat (131), a fixed seat (132), a guide column (133) and an elastic member. The fixed seat (132) is fixedly connected to the driving mechanism (120). The movable seat (131) is fixedly connected to the probe (110). One of the movable seat (131) and the fixed seat (132) is provided with a through hole, and the other has a fixed position. The guide column (133) includes a guide section (1331) and a connecting section (1332). The guide section (1331) is located in the through hole. The guide section (1331) is connected to the connecting section (1332). There is a gap between the through holes, so that the movable seat (131) can swing relative to the fixed seat (132) within the gap; the end of the connecting section (1332) away from the guide section (1331) is fixedly connected to the fixed position, and the movable seat (131) can slide back and forth along the first direction relative to the fixed seat (132) through the guide column (133); the elastic member is located between the movable seat (131) and the fixed seat (132), and the elastic member is used to adjust the distance between the fixed seat (132) and the movable seat (131); Wherein, the first direction is the axial direction of the probe (110); The guide centering sleeve (140) further comprises a protective section (141) and a fixing section (142), wherein the fixing section (142) is sleeved on the front end of the probe (110) and fixedly connected to the probe (110), and the protective section (141) extends from the probe (110) along a first direction to wrap the probe (110); A channel is provided in the protection section (141), and the projection shape of the channel along the first direction is the same as the shape of the head of the enclosure bolt (200) so as to match the head. The probe (110) can be connected to the head through the channel.

2. The inspection probe assembly for bolts of the containment of a nuclear power plant according to claim 1, wherein, The movable seat (131) is provided with the through hole, the fixed seat (132) is provided with the fixed position, and the guide column (133) is fixedly connected to the fixed seat (132).

3. The bolt detection probe assembly for the containment of a nuclear power plant according to claim 2, wherein, The elastic member is a coil spring (134), which is sleeved on the guide column (133). The coil spring (134) is used to drive the movable seat (131) and the fixed seat (132) to move relatively away from each other.

4. A bolt detection probe assembly for a nuclear power plant containment panel according to claim 3, characterized in that, The plurality of guide posts (133) are arranged at intervals along the circumference of the probe (110), and the plurality of coil springs (134) are sleeved on the plurality of guide posts (133) in a one-to-one correspondence.

5. The inspection probe assembly for bolts of the containment panel of a nuclear power plant according to claim 2, characterized in that, The through hole extends along the first direction. Along the first direction away from the probe (110), the aperture of the through hole gradually decreases, and the diameter of the guiding section (1331) gradually decreases to restrict the movable seat (131) from disengaging from the guide post (133) in the direction of the probe (110) along the first direction.

6. The bolt detection probe assembly for the containment of a nuclear power plant according to claim 1, characterized in that, The guiding and centering sleeve (140) further includes a transverse groove (143). The transverse groove (143) is arranged along the diameter direction of the protection section (141) and penetrates through the protection section (141). The protection section (141) includes a first protection section (1411) and a second protection section (1412) respectively arranged on both sides of the transverse groove (143).

7. A bolt detection probe assembly for a nuclear power plant containment panel according to claim 6, characterized in that Both ends of the first protection section (1411) and the second protection section (1412) in their respective circumferences are provided with chamfers. Along the first direction away from the probe (110), the distance between the first protection section (1411) and the second protection section (1412) gradually decreases.

8. The bolt detection probe assembly for the containment of a nuclear power plant according to claim 1, wherein The driving mechanism (120) includes a reduction motor and a transmission system. The reduction motor is used to provide power for the translation and rotation of the probe (110), and the transmission system is used to transmit the torque of the reduction motor and output it as the translation and rotation movements of the probe (110).

Images