阅读说明：本技术 用于大型环件超声波扫描的尺寸可变环形工作水槽结构 (size-variable annular working water tank structure for ultrasonic scanning of large ring piece ) 是由 张大伟 鱼在池 李健 张琦 赵升吨 于 2019-09-28 设计创作，主要内容包括：一种用于大型环件超声波扫描的尺寸可变环形工作水槽结构,包括内、外壁板件,内、外壁板件竖立安装在底板上,围成内、外两个多边形筒,内壁板件围成的多边形筒的外侧、外壁板件围成的多边形筒的内侧以及底板的上侧,形成了一个上面开口的环形容器空间,大型环件能够放入环形容器空间中,注入水,使大型环件没入水中,使用水浸聚焦探头对大型环件进行探伤作业；内壁板件的同步结构位于内壁板件围成的多边形筒的内侧,外壁板件的同步结构位于外壁板件围成的多边形筒的外侧；本发明减少工作水槽的过剩空间,节省用水量,提高注水效率；同时实现环形工作水槽的容积尺寸可调,适应不同规格与尺寸特征的大型环件的液(水)浸法超声波探伤的要求。(A size-variable annular working water tank structure for ultrasonic scanning of large ring pieces comprises inner and outer wall plates, wherein the inner and outer wall plates are vertically arranged on a bottom plate and form an inner polygonal cylinder and an outer polygonal cylinder, the outer side of the polygonal cylinder formed by the inner wall plates, the inner side of the polygonal cylinder formed by the outer wall plates and the upper side of the bottom plate form an annular container space with an opening on the upper surface, the large ring pieces can be placed in the annular container space, water is injected to immerse the large ring pieces in the water, and a water immersion focusing probe is used for carrying out flaw detection operation on the large ring pieces; the synchronous structure of the inner wall plate is positioned on the inner side of the polygonal cylinder enclosed by the inner wall plate, and the synchronous structure of the outer wall plate is positioned on the outer side of the polygonal cylinder enclosed by the outer wall plate; the invention reduces the excess space of the working water tank, saves water consumption and improves water injection efficiency; meanwhile, the volume size of the annular working water tank can be adjusted, and the ultrasonic flaw detection device meets the requirements of liquid (water) immersion method ultrasonic flaw detection of large rings with different specifications and size characteristics.)

1. the utility model provides a size variable annular work basin structure for large-scale ring piece ultrasonic scanning which characterized in that: the device comprises a bottom plate, an inner wall plate and a synchronous structure thereof, and an outer wall plate and a synchronous structure thereof, wherein the inner wall plate and the outer wall plate are vertically arranged on the bottom plate to form an inner polygonal cylinder and an outer polygonal cylinder, the geometric centers of the two polygons are overlapped, the number of edges is N, and N is an even number and is not less than 4; the outer side of the polygonal cylinder defined by the inner wall plates, the inner side of the polygonal cylinder defined by the outer wall plates and the upper side of the bottom plate form an annular container space with an opening on the upper surface, the large ring piece can be placed in the annular container space, water is injected to immerse the large ring piece in the water, and a water immersion focusing probe is used for carrying out flaw detection operation on the large ring piece; the synchronous structure of the inner wall plate is positioned on the inner side of the polygonal cylinder enclosed by the inner wall plate, and the synchronous structure of the outer wall plate is positioned on the outer side of the polygonal cylinder enclosed by the outer wall plate.

2. The variable-size annular working water tank structure for ultrasonic scanning of large rings according to claim 1, wherein: the bottom plate is provided with N radial guide rails distributed along the circumferential direction, so that the inner wall plate and the outer wall plate move along the radial guide rails.

3. The variable-size annular working water tank structure for ultrasonic scanning of large rings according to claim 1, wherein: the inner wall plate and the synchronous structure thereof comprise an inner wall plate and an inner wall plate synchronous mechanism; the inner wall plate comprises an inner wall inner plate and an inner wall outer plate, wherein the number of the inner wall inner plate and the number of the inner wall outer plate are respectively N/2, the inner wall inner plate and the inner wall outer plate are the same in structure and are formed by two flat plates with included angles theta, and the theta satisfies a formula (1):

θ＝180°×(N-2)/N (1)

The two flat plates forming the inner wall inner plate have the same size, the length of the side in the height direction is H, and the length of the side in the horizontal direction is L₁the thickness is b; the two flat plates forming the inner wall outer plate have the same size, the side length in the height direction is H, and the side length in the horizontal direction is L₂the thickness is b; the inner wall inner plates and the inner wall outer plates are alternately arranged along the circumferential direction, the adjacent inner wall inner plates and the inner wall outer plates are overlapped by a flat plate to form a polygonal cylinder, and the overlapping distance is recorded as delta L_in，0≤ΔL_in＜min(L₁,L₂) (ii) a The inner sides of the plane joints of the inner wall inner plate and the inner wall outer plate are both provided with connecting structures which are connected with the inner wall connecting rods; in order to maximize the side length variation range of the polygon formed by the inner wall plates and prevent the connection structure of any inner wall plate and the adjacent inner wall plate from interfering, L is taken₁≤L₂Length of polygon edge L_inSatisfies formula (2):

L_in＝L₁+L₂-ΔL_in (2)

Diameter D of the circumscribed circle of polygon_inSatisfies formula (3):

the bottom of the plane joint of the inner wall inner plate and the inner wall outer plate is provided with a sliding block which is matched with the radial guide rail to ensure that the inner wall inner plate and the inner wall outer plate move along the direction of the guide rail of the bottom plate and change the overlapping distance delta L of the two wall plates_inFurther changing the diameter D of the polygon circumscribed circle_in。

4. The variable-size annular working water tank structure for ultrasonic scanning of large rings according to claim 3, wherein: inner wall plate lazytongs include inner wall synchronizing bar, inner wall connecting rod, inner wall synchronizing bar is connected through the inner wall connecting rod with the inner wall plate, when carrying out position control to the inner wall plate, the inner wall synchronizing bar rotates around the center, guarantee that all inner wall plates remove in step, the direction rotation that defines inner wall synchronizing bar and is the corotation by the line of inner wall synchronizing bar center to the straight line at the inner wall synchronizing bar place that corresponds with this inner wall plate, when the corotation of inner wall synchronizing bar, D_inDecrease; when the inner wall synchronous rod rotates reversely, D_inAnd is increased.

5. The variable-size annular working water tank structure for ultrasonic scanning of large rings according to claim 3, wherein: the outer wall plate and the synchronizing structure thereof comprise an outer wall plate and an outer wall plate synchronizing mechanism; the outer wall plate comprises an outer wall inner plate and an outer wall outer plate, wherein the number of the outer wall inner plate and the number of the outer wall outer plate are respectively N/2, the outer wall inner plate and the outer wall outer plate are identical in structure and are respectively formed by two flat plates with included angles theta, and the theta satisfies a formula (1); the two flat plates forming the outer wall inner plate have the same size, the length of the side in the height direction is H, and the length of the side in the horizontal direction is L₃The thickness is b; the two flat plates forming the outer plate of the outer wall have the same size, the side length in the height direction is H, and the side length in the horizontal direction is L₄The thickness is b; the outer wall inner plates and the outer wall outer plates are alternately arranged along the circumferential direction, the adjacent outer wall inner plates and the outer wall outer plates are overlapped by a flat plate to form a polygonal cylinder, and the overlapping distance is recorded as delta L_out，0≤ΔL_out＜min(L₃,L₄) (ii) a The inner sides of the plane joints of the outer wall inner plate and the outer wall outer plate are both provided with connecting structures which are connected with the outer wall connecting rod; in order to maximize the side length variation range of the polygon formed by the outer wall plates and prevent the connection structure of any outer wall plate and the adjacent outer wall plate from interfering, L₃And L₄Are not greatly different in valuelength of polygon edge L_outSatisfies formula (4):

L_out＝L₃+L₄-ΔL_out (4)

Diameter D of polygon inscribed circle_outSatisfies the following conditions:

The bottom of the plane joint of the outer wall inner plate and the outer wall outer plate is provided with a sliding block which is matched with the radial guide rail to ensure that the outer wall inner plate and the outer wall outer plate move along the radial guide rail direction and change the overlapping distance delta L of the two outer wall plates_outFurther changing the diameter D of the polygon inscribed circle_out。

6. The variable-size annular working water tank structure for ultrasonic scanning of the large ring according to claim 5, wherein: the outer wall plate synchronizing mechanism comprises an outer wall synchronizing ring and an outer wall connecting rod, the outer wall synchronizing ring is connected with the outer wall plates through the outer wall connecting rod, and when the position of the outer wall plates is adjusted, the outer wall synchronously rotates around the center of the outer wall plates, so that all the outer wall plates are ensured to move synchronously; defining that when a certain connecting mechanism on the outer wall synchronous ring is far away from the guide rail position of the outer wall plate corresponding to the connecting mechanism, the rotating direction of the outer wall synchronous ring is the positive rotating direction, and when the outer wall synchronous ring rotates positively, D_outincreasing; when the outer wall synchronizer ring is reversed, D_outAnd decreases.

Technical Field

The invention belongs to the technical field of large forging quality detection, and particularly relates to a size-variable annular working water tank structure for ultrasonic scanning of a large ring piece.

Background

The large ring parts (the diameter is generally larger than 5 meters) are widely used in the fields of aviation, aerospace, energy, traffic and the like, and the fields have higher requirements on the performance of the ring parts. At present, ring rolling and the like are common techniques for manufacturing large ring parts. Large ring parts include thin-walled rings, profiled rings, thick-walled discs, etc., which often result in internal defects in the finished part during the forming process due to internal defects in the blank material. For the special-shaped ring, different parts of the ring deform differently in the large-deformation high-speed rolling process, and forging cracks are easy to generate, so that flaw detection for large ring parts is an important work.

As a non-destructive inspection technique, ultrasonic scanning is often used to detect internal defects and damage to parts. When the large-sized part is subjected to flaw detection, a handheld probe can be used for scanning, and the method has the advantages of low detection precision, low efficiency, uncertain scanning track and difficult analysis of results. Because the advantage of easy realization of automation, the totally submerged (water) immersion method of ultrasonic wave is detected a flaw and is comparatively common in the part is detected a flaw and is worked, this method uses the water immersion focusing probe to carry out ultrasonic detection, and the probe size is little, detects the frequency height, and the probe does not contact with the part, realizes probe motion control more easily. The totally submerged (water) immersion method requires the parts to be immersed in the coupling medium (water), and for large rings, a working water tank with a large volume is required. The size of the existing rectangular working water tank is small, and the size requirement of a large ring piece cannot be met. If the size is increased on the basis of the original working water tank to meet the size requirement of a large-sized ring piece, the water quantity required by the working water tank is large, and the efficiency is lower when water is injected. The size variation range of the large-sized ring piece is wide, and the adaptability of the working water tank with a fixed size to the large-sized ring piece with different specifications and size characteristics is limited.

Disclosure of Invention

in order to overcome the defects, the invention aims to provide the size-variable annular working water tank structure for ultrasonic scanning of the large ring piece, so that the shape of the large ring piece is fitted on the premise of reserving the working space of the ultrasonic probe, the excess space of the working water tank is reduced, the water consumption is saved, and the water injection efficiency is improved; meanwhile, the volume size of the annular working water tank can be adjusted, and the ultrasonic flaw detection device meets the requirements of liquid (water) immersion method ultrasonic flaw detection of large rings with different specifications and size characteristics.

In order to achieve the purpose, the invention adopts the technical scheme that:

a variable-size annular working flume structure for ultrasonic scanning of large rings, comprising: the inner wall plate and the outer wall plate are vertically arranged on the bottom plate to form an inner polygonal cylinder and an outer polygonal cylinder, the geometric centers of the two polygons are overlapped, the number of the sides is N, and N is an even number and is not less than 4; the outer side of the polygonal cylinder defined by the inner wall plates, the inner side of the polygonal cylinder defined by the outer wall plates and the upper side of the bottom plate form an annular container space with an opening on the upper surface, the large ring piece can be placed in the annular container space, water is injected to immerse the large ring piece in the water, and a water immersion focusing probe is used for carrying out flaw detection operation on the large ring piece; the synchronous structure of the inner wall plate is positioned on the inner side of the polygonal cylinder enclosed by the inner wall plate, and the synchronous structure of the outer wall plate is positioned on the outer side of the polygonal cylinder enclosed by the outer wall plate.

The bottom plate is provided with N radial guide rails distributed along the circumferential direction, so that the inner wall plate and the outer wall plate move along the radial guide rails.

The inner wall plate and the synchronous structure thereof comprise an inner wall plate and an inner wall plate synchronous mechanism; the inner wall plate comprises an inner wall inner plate and an inner wall outer plate, wherein the number of the inner wall inner plate and the number of the inner wall outer plate are respectively N/2, the inner wall inner plate and the inner wall outer plate are the same in structure and are formed by two flat plates with included angles theta, and the theta satisfies a formula (1):

θ＝180°×(N-2)/N (1)

The two flat plates forming the inner wall inner plate have the same size, the length of the side in the height direction is H, and the length of the side in the horizontal direction is L₁The thickness is b; the two flat plates forming the inner wall outer plate have the same size, the side length in the height direction is H, and the two flat plates are in a horizontal squarelength of side in direction of L₂The thickness is b; the inner wall inner plates and the inner wall outer plates are alternately arranged along the circumferential direction, the adjacent inner wall inner plates and the inner wall outer plates are overlapped by a flat plate to form a polygonal cylinder, and the overlapping distance is recorded as delta L_in，0≤ΔL_in＜min(L₁,L₂) (ii) a The inner sides of the plane joints of the inner wall inner plate and the inner wall outer plate are both provided with connecting structures which are connected with the inner wall connecting rods; in order to maximize the side length variation range of the polygon formed by the inner wall plates and prevent the connection structure of any inner wall plate and the adjacent inner wall plate from interfering, L is taken₁≤L₂Length of polygon edge L_inSatisfies formula (2):

L_in＝L₁+L₂-ΔL_in (2)

Diameter D of the circumscribed circle of polygon_inSatisfies formula (3):

the bottom of the plane joint of the inner wall inner plate and the inner wall outer plate is provided with a sliding block which is matched with the radial guide rail to ensure that the inner wall inner plate and the inner wall outer plate move along the direction of the guide rail of the bottom plate and change the overlapping distance delta L of the two wall plates_infurther changing the diameter D of the polygon circumscribed circle_in。

Inner wall plate lazytongs include inner wall synchronizing bar, inner wall connecting rod, inner wall synchronizing bar is connected through the inner wall connecting rod with the inner wall plate, when carrying out position control to the inner wall plate, the inner wall synchronizing bar rotates around the center, guarantee that all inner wall plates remove in step, the direction rotation that defines inner wall synchronizing bar and is the corotation by the line of inner wall synchronizing bar center to the straight line at the inner wall synchronizing bar place that corresponds with this inner wall plate, when the corotation of inner wall synchronizing bar, D_inDecrease; when the inner wall synchronous rod rotates reversely, D_inAnd is increased.

The outer wall plate and the synchronizing structure thereof comprise an outer wall plate and an outer wall plate synchronizing mechanism; the outer wall plate comprises an outer wall inner plate and an outer wall outer plate, wherein the number of the outer wall inner plate and the number of the outer wall outer plate are respectively N/2, and the outer wall inner plate and the outer wall outer plate have the same structureEach flat plate is composed of two flat plates with an included angle theta, and the theta satisfies a formula (1); the two flat plates forming the outer wall inner plate have the same size, the length of the side in the height direction is H, and the length of the side in the horizontal direction is L₃The thickness is b; the two flat plates forming the outer plate of the outer wall have the same size, the side length in the height direction is H, and the side length in the horizontal direction is L₄The thickness is b; the outer wall inner plates and the outer wall outer plates are alternately arranged along the circumferential direction, the adjacent outer wall inner plates and the outer wall outer plates are overlapped by a flat plate to form a polygonal cylinder, and the overlapping distance is recorded as delta L_out，0≤ΔL_out＜min(L₃,L₄) (ii) a The inner sides of the plane joints of the outer wall inner plate and the outer wall outer plate are both provided with connecting structures which are connected with the outer wall connecting rod; in order to maximize the side length variation range of the polygon formed by the outer wall plates and prevent the connection structure of any outer wall plate and the adjacent outer wall plate from interfering, L₃And L₄If the values of (A) are not very different, the side length L of the polygon is_outSatisfies formula (4):

L_out＝L₃+L₄-ΔL_out (4)

Diameter D of polygon inscribed circle_outSatisfies the following conditions:

The bottom of the plane joint of the outer wall inner plate and the outer wall outer plate is provided with a sliding block which is matched with the radial guide rail to ensure that the outer wall inner plate and the outer wall outer plate move along the radial guide rail direction and change the overlapping distance delta L of the two outer wall plates_outFurther changing the diameter D of the polygon inscribed circle_out。

The outer wall plate synchronizing mechanism comprises an outer wall synchronizing ring and an outer wall connecting rod, the outer wall synchronizing ring is connected with the outer wall plates through the outer wall connecting rod, and when the position of the outer wall plates is adjusted, the outer wall synchronously rotates around the center of the outer wall plates, so that all the outer wall plates are ensured to move synchronously; defining that when a certain connecting mechanism on the outer wall synchronous ring is far away from the guide rail position of the outer wall plate corresponding to the connecting mechanism, the rotating direction of the outer wall synchronous ring is the positive rotating direction, and when the outer wall synchronous ring rotates positively, D_outIncreasing; when the outer wall synchronizer ring is reversed, D_outAnd decreases.

The invention has the beneficial effects that:

By using the annular structure, the requirement of water immersion of the large ring piece is ensured, the container space of the annular water tank is reduced to a great extent, the water consumption during flaw detection is saved, and the water injection efficiency is improved. The sizes of the inner wall and the outer wall of the annular structure can be respectively adjusted and changed, so that the same water tank structure can be suitable for large-sized ring pieces with different specifications and different size characteristics.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a top view of fig. 1.

Fig. 3 is a partially enlarged view of fig. 2 at a.

Fig. 4 is a schematic view of a base plate.

Fig. 5 is a partially enlarged view of fig. 4 at B.

Fig. 6 is a schematic view of an inner wall inner panel (inner wall outer panel).

Fig. 7 is a schematic view of an outer wall inner panel (outer wall panel).

Detailed Description

The invention is described in detail below with reference to the figures and examples.

Referring to fig. 1 and 2, the size-variable annular working water tank structure for ultrasonic scanning of the large ring piece comprises a bottom plate 1, an inner wall plate and a synchronous structure thereof, and an outer wall plate and a synchronous structure thereof, wherein the inner wall plate and the outer wall plate are vertically installed on the bottom plate 1 and enclose an inner polygonal cylinder and an outer polygonal cylinder, the geometric centers of the two polygons are overlapped, the number of the sides of the polygonal cylinders is N, and N is an even number and is not less than 4. In this embodiment, N ═ 8; the outer side of the polygonal cylinder defined by the inner wall plates, the inner side of the polygonal cylinder defined by the outer wall plates and the upper side of the bottom plate form an annular container space with an opening on the upper surface, the large ring piece can be placed in the annular container space, water is injected to immerse the large ring piece in the water, and then a water immersion focusing probe can be used for carrying out flaw detection operation on the large ring piece; the synchronous structure of the inner wall plate is positioned on the inner side of the polygonal cylinder enclosed by the inner wall plate, and the synchronous structure of the outer wall plate is positioned on the outer side of the polygonal cylinder enclosed by the outer wall plate.

Referring to fig. 4 and 5, the bottom plate 1 has N radial guide rails 101 distributed along the circumferential direction, so that the inner wall plate member and the outer wall plate member move along the radial guide rails 101, and in the present embodiment, the number of the radial guide rails 101 is 8.

The inner wall plate and the synchronous structure thereof comprise an inner wall plate and an inner wall plate synchronous mechanism; the inner wall plates comprise inner wall inner plates 6 and inner wall outer plates 7, wherein N/2 inner wall inner plates 6 and N/2 outer wall outer plates 7 are respectively arranged, and in the embodiment, 4 inner wall inner plates 6 and 4 inner wall outer plates 7 are respectively arranged; referring to fig. 6, the inner wall inner plate 6 and the inner wall outer plate 7 have the same structure and are both composed of two flat plates 601(701), 602(702) with an included angle θ, and θ satisfies formula (1):

θ＝180°×(N-2)/N (1)

In this embodiment, N is 8, θ is 135 °; the two flat plates of the inner wall inner plate 6 have the same size, the length of the side in the height direction is H, and the length of the side in the horizontal direction is L₁The thickness is b; the side length in the direction of the intersection line of the planes of the two flat plates is H, and the side length in the direction perpendicular to the intersection line is L₁(ii) a The two flat plates of the inner wall outer plate 7 have the same size, the side length in the height direction is H, and the side length in the horizontal direction is L₂And b, referring to fig. 3, the inner wall inner plates 6 and the inner wall outer plates 7 are alternately arranged along the circumferential direction, and the adjacent inner wall inner plates 6 and the inner wall outer plates 7 are overlapped by a flat plate to form a polygonal cylinder, and the overlapping distance is marked as delta L_in，0≤ΔL_in＜min(L₁,L₂) (ii) a The inner sides of the plane joints of the inner wall inner plate 6 and the inner wall outer plate 7 are respectively provided with a connecting structure 603 and 703 which can be connected with the inner wall connecting rod; generally, in order to maximize the side length variation range of the polygon formed by the inner wall plates and prevent the interference of the connecting structure of any inner wall plate and the adjacent inner wall plate, L is taken₁≤L₂Length of polygon edge L_inSatisfies formula (2):

L_in＝L₁+L₂-ΔL_in (2)

Diameter D of the circumscribed circle of polygon_inSatisfies (3):

The bottom of the plane joint of the inner wall inner plate 6 and the inner wall outer plate 7 is provided with a sliding block 604 and a sliding block 704, the sliding block 604 and the sliding block 704 can be matched with the radial guide rail 101, so that the inner wall inner plate 6 and the inner wall outer plate 7 move along the direction of the radial guide rail 101, and the overlapping distance delta L of the two wall plates is changed_inFurther changing the diameter D of the polygon circumscribed circle_in。

Referring to fig. 1 and 2, the inner wall plate synchronizing mechanism includes an inner wall synchronizing rod 9 and an inner wall connecting rod 8, the inner wall synchronizing rod 9 is connected with the inner wall plate through the inner wall connecting rod 8, and when the position of the inner wall plate is adjusted, the inner wall synchronizing rod 9 rotates around the center to ensure that all the inner wall plates move synchronously; the direction of the inner wall synchronous rod 9 from the connecting line of the center of the inner wall synchronous rod to the inner wall plate to the straight line where the inner wall synchronous rod corresponding to the inner wall plate is located is defined to be positive rotation, and when the inner wall synchronous rod 9 is positive rotation, D is positive rotation_indecrease; when the inner wall synchronizing bar 9 is reversed, D_inAnd is increased.

The outer wall plate and the synchronizing structure thereof comprise an outer wall plate and an outer wall plate synchronizing mechanism, the outer wall plate comprises an outer wall inner plate 2 and an outer wall outer plate 3, N/2 outer wall inner plates 2 and N/2 outer wall outer plates 3 are respectively arranged, and in the embodiment, 4 outer wall inner plates 2 and 4 outer wall outer plates 3 are respectively arranged; referring to fig. 7, the outer wall inner plate 2 and the outer wall outer plate 3 have the same structure and are both composed of two flat plates 201(301) and 202(302) with an included angle θ, θ satisfies formula (1), and in this embodiment, the calculated value of θ is 135 °; the two flat plates of the outer wall inner plate 2 have the same size, the length of the side in the height direction is H, and the length of the side in the horizontal direction is L₃The thickness is b; the two flat plates of the outer wall outer plate 3 have the same size, the side length in the height direction is H, and the side length in the horizontal direction is L₄(ii) a Referring to fig. 3, the outer wall inner plates 2 and the outer wall outer plates 3 are alternately arranged in the circumferential direction, and the adjacent outer wall inner plates 2 and outer wall outer plates 3 have a flat plate overlap to form a polygonal cylinder, and the overlap distance is represented as Δ L_out，0≤ΔL_out＜min(L₃,L₄) The inner sides of the plane joints of the outer wall inner plate 2 and the outer wall outer plate 3 are both provided with connecting structures 203 and 303 which are connected with the outer wall connecting rod 4; in general, in order to maximize the side length variation range of the polygon formed by the outer wall plates without interference of the connection structure of any outer wall plate and the adjacent outer wall plate, L₃And L₄If the values of (A) are not very different, the side length L of the polygon is_outsatisfies formula (4):

L_out＝L₃+L₄-ΔL_out (4)

Diameter D of polygon inscribed circle_outSatisfies formula (5):

The bottom of the plane joint of the outer wall inner plate 2 and the outer wall outer plate 3 is provided with sliding blocks 204 and 304 which are matched with the radial guide rail 101, so that the outer wall inner plate 2 and the outer wall outer plate 3 move along the direction of the radial guide rail 101, and the overlapping distance delta L of the two outer wall plates is changed_outfurther changing the diameter D of the polygon inscribed circle_out。

The outer wall plate synchronizing mechanism comprises an outer wall synchronizing ring 5 and an outer wall connecting rod 4, the outer wall synchronizing ring 5 is connected with the outer wall plate through the outer wall connecting rod 4, and when the position of the outer wall plate is adjusted, the outer wall synchronizing ring 5 rotates around the center of the outer wall plate to ensure that all the outer wall plates move synchronously; when a certain connecting mechanism on the outer wall synchronizing ring 5 is far away from the position of the guide rail where the corresponding outer wall plate is located, the rotating direction of the outer wall synchronizing ring 5 is defined as the positive rotating direction, and when the outer wall synchronizing ring 5 rotates positively, D_outincreasing; when the outer wall synchronizer ring 5 is reversed, D_outAnd decreases.

the working principle of the invention is as follows:

Referring to fig. 3, when the size of the present invention is adjusted, the maximum outer diameter D and the minimum inner diameter D of the large ring to be subjected to flaw detection are measured first; then, considering the working space of the probe, the diameter D of a polygon circumscribed circle enclosed by the inner wall plates of the annular water tank_inSatisfies formula (6):

D_in≤d-2ΔD (6)

In the formula, Δ D is the radial width corresponding to the working space of the probe.

In a similar way, the diameter of a polygon inscribed circle formed by the outer wall plates of the annular water tank meets the formula (7):

D_out＝D+2ΔD (7)

the overlapping distance Delta L of the adjacent inner wall inner plate 6 and the inner wall outer plate 7 is obtained by the formulas (1), (2), (3) and (6)_in(ii) a Moving the inner wall plates so that the overlapping distance between the inner wall inner plate 6 and the inner wall outer plate 7 satisfies the formula of Δ L_inThe value is obtained.

The overlap distance DeltaL between the adjacent outer wall inner plate 2 and outer wall outer plate 3 can be obtained from the formulas (1), (4), (5) and (7)_inmoving the outer wall plates so that the overlapping distance between the outer wall inner plate 2 and the outer wall outer plate 3 satisfies the formula of Δ L_outAnd (4) adjusting the value to be finished.