An ultrasonic non-destructive testing device for the inner wall of a pipe

Abstract

The application relates to the technical field of ultrasonic detection, in particular to an ultrasonic nondestructive testing device for the inner wall of a pipeline, which comprises an ultrasonic detection joint, the ultrasonic detection joint comprises a fixed sleeve, and a plurality of ultrasonic probe assemblies are arranged on the circumference of the fixed sleeve; the ultrasonic probe assembly comprises a fixing frame, an ultrasonic probe and a hydraulic assembly; the fixing frame is hingedly arranged on the fixed sleeve, both ends of the fixing frame along the length direction are provided with guide wheels, the ultrasonic probe is rotationally arranged at the middle position of the fixing frame, the hydraulic assembly comprises N telescopic cylinders which are connected with each other through a hydraulic system, N>=5, and N is an odd number; when and only when the number M of the telescopic cylinders subjected to extrusion satisfies N-2<=M<=N, the hydraulic system enables the hydraulic oil between the N telescopic cylinders to flow mutually, so that the N telescopic cylinders drive the ultrasonic probe to rotate relative to the fixing frame through a tension spring, in this way, the ultrasonic probe can be kept in the middle position and will not rotate frequently, and the detection accuracy is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ultrasonic detection, in particular to an ultrasonic nondestructive testing device for the inner wall of a pipeline. BACKGROUND

[0002] Ultrasonic detection is a widely used technology in the detection of pipeline inner walls. It uses an ultrasonic inner detector to perform nondestructive testing on the inner surface of the pipeline and is widely used in the fields of oil pipelines and gas storage pipelines. It can detect early-stage defects such as pipeline wear and deformation.

[0003] Patent No. CN119467930B discloses a high-flexibility ultrasonic probe tracking connection device and a pipeline internal nondestructive testing method. The device includes tracking probes arranged uniformly along the circumference of the detection cabin, and each tracking probe is hingedly connected to the detection cabin. The tracking probe is composed of a tracking block and an ultrasonic probe that moves along the pipeline. In the direction of the detection cabin, at least one set of springs is arranged in front of and behind the ultrasonic probe. The ultrasonic probe is elastically installed on the tracking block by the springs. At the same time, in the direction of the detection cabin, at least one set of guiding mechanisms that move along the pipe wall is arranged in front of and behind the ultrasonic probe. The guiding mechanism is an inner floating roller installed at the end of the ultrasonic probe. When the detection device encounters a protrusion in the pipe wall, the ultrasonic probe can automatically adjust the angle. However, due to the distance between the inner floating roller and the ultrasonic probe, the angle adjustment of the ultrasonic probe lags behind the inner floating roller, which may result in inaccurate ultrasonic detection results of the inner wall of the pipeline. SUMMARY

[0004] Therefore, it is necessary to provide an ultrasonic nondestructive testing device for the inner wall of a pipeline to solve the problem of inaccurate ultrasonic detection of the inner wall of a pipeline.

[0005] The above-mentioned purpose is achieved by the following technical solutions:

[0006] The utility model provides an ultrasonic nondestructive testing device for the inner wall of pipeline, which comprises an ultrasonic detection section, the ultrasonic detection section comprises a fixed sleeve, and a plurality of ultrasonic probe assemblies are arranged on the circumference of the fixed sleeve; the ultrasonic probe assembly comprises a fixed frame, an ultrasonic probe and a hydraulic assembly; the fixed frame is hingedly arranged on the fixed sleeve, and the length of the fixed frame extends along the axial direction of the fixed sleeve; the two ends of the fixed frame along the length direction are provided with guide wheels for sliding along the inner wall of the pipeline to be detected; the ultrasonic probe is rotationally arranged at the middle position of the fixed frame, and the ultrasonic probe extends along the radial direction of the fixed sleeve; the hydraulic assembly comprises N telescopic cylinders connected by a hydraulic system, N is greater than or equal to 5, and N is an odd number; the N telescopic cylinders are uniformly distributed around the circumference of the ultrasonic probe and can extend and retract along the radial direction of the fixed sleeve; one end of each telescopic cylinder away from the fixed sleeve is provided with a tension spring, the tension spring extends along the radial direction of the ultrasonic probe and is connected with the ultrasonic probe; only when the number M of telescopic cylinders subjected to extrusion satisfies N-2≤M≤N, the hydraulic system allows the hydraulic oil between the N telescopic cylinders to flow, so that the N telescopic cylinders can synchronously slide along the radial direction of the fixed sleeve, and then the ultrasonic probe is driven to rotate relative to the fixed frame by the tension spring.

[0007] Further, a plurality of fixed cylinders extending along the radial direction of the fixed sleeve are arranged on the fixed frame, the number of the fixed cylinders is consistent with that of the telescopic cylinders, the telescopic cylinders are slidingly arranged in the corresponding fixed cylinders, the fixed cylinders and the telescopic cylinders are filled with hydraulic oil, and a compression spring is arranged between the fixed cylinder and the telescopic cylinder, the compression spring has a tendency to make the telescopic cylinder extend out of the fixed cylinder, and a ball is rotationally arranged at one end of the telescopic cylinder away from the fixed cylinder, the ball is used for sliding contact with the inner wall of the pipeline.

[0008] Further, the three adjacent fixed cylinders are defined to be distributed in the front-back direction around the circumference of the ultrasonic probe, the hydraulic system comprises a first hydraulic pipeline and a second hydraulic pipeline arranged between two adjacent fixed cylinders, each telescopic cylinder is provided with a first adjusting member and a second adjusting member, the first adjusting member is used for controlling the on-off of the first hydraulic pipeline between the fixed cylinder and the adjacent front fixed cylinder, and the second adjusting member is used for controlling the on-off of the second hydraulic pipeline between the fixed cylinder and the adjacent rear fixed cylinder.

[0009] Further, the first adjusting member comprises a first adjusting rod and a first adjusting cylinder, the first adjusting cylinder extends along the radial direction of the fixed sleeve, the first adjusting rod is an L-shaped rod and is slidingly arranged in the first adjusting cylinder, the first adjusting cylinder is rotationally arranged in the first hydraulic pipeline, a first channel is formed through the first adjusting cylinder, and the first channel can be in communication with the first hydraulic pipeline; the second adjusting member comprises a second adjusting rod and a second adjusting cylinder, the second adjusting cylinder extends along the radial direction of the fixed sleeve, the second adjusting rod is an L-shaped rod and is slidingly arranged in the second adjusting cylinder, the second adjusting cylinder is rotationally arranged in the second hydraulic pipeline, a second channel is formed through the second adjusting cylinder, and the second channel can be in communication with the second hydraulic pipeline; when the telescopic cylinder is extruded by the inner wall of the pipeline, the telescopic cylinder slides in the corresponding fixed cylinder and compresses the compression spring, the telescopic cylinder simultaneously drives the first adjusting rod to slide in the first adjusting cylinder and the second adjusting rod to slide in the second adjusting cylinder, and then the first adjusting cylinder rotates around its axis to the first channel being in communication with the first hydraulic pipeline and the second adjusting cylinder rotates around its axis to the second channel being in communication with the second hydraulic pipeline.

[0010] Further, the first adjusting rod and the second adjusting rod are both provided with protrusions, the inner walls of the first adjusting cylinder and the second adjusting cylinder are both provided with spiral grooves, and the protrusions can drive the first adjusting cylinder or the second adjusting cylinder to rotate around its axis when the protrusions slide along the spiral grooves.

[0011] Further, the end of the first adjusting cylinder is provided with a first connecting ball, the first adjusting cylinder is rotationally arranged in the first hydraulic pipeline through the first connecting ball, the first channel is arranged on the first connecting ball, the end of the second adjusting cylinder is provided with a second connecting ball, the second adjusting cylinder is rotationally arranged in the second hydraulic pipeline through the second connecting ball, and the second channel is arranged on the second connecting ball.

[0012] Further, the fixed frame is hingedly arranged on the fixed sleeve through a hinge shaft, and the hinge shaft is perpendicular to the axis of the fixed sleeve.

[0013] Further, the ultrasonic probe is in a cylindrical structure, a plurality of telescopic rods are distributed in the circumferential direction of the ultrasonic probe, each telescopic rod extends along the radial direction of the ultrasonic probe, a plurality of hydraulic rods are arranged on the fixed frame, each hydraulic rod extends along the radial direction of the fixed sleeve, and the telescopic rods and the hydraulic rods are in one-to-one correspondence and are hingedly connected.

[0014] Further, the fixed frame is provided with a hemispherical protrusion, and the ultrasonic probe is rotationally arranged on the hemispherical protrusion.

[0015] Further, N is equal to 5.

[0016] The present application has the following beneficial effects:

[0017] The pipeline inner wall ultrasonic nondestructive testing device provided by the application has the following advantages: first, the at least five telescopic cylinders are uniformly distributed around the ultrasonic probe, so that the ultrasonic probe can keep centered and rotate to realize angle adjustment when encountering a convex weld, compared with the prior art, the angle adjustment of the ultrasonic probe will not lag, thereby the detection accuracy can be improved.

[0018] Second, when encountering a convex weld, the convex weld will extrude the telescopic cylinders on each fixing frame, when less than M telescopic cylinders are extruded, it indicates that the convex weld at the detection position is not obvious, at this time, the hydraulic oil between all the telescopic cylinders will not flow to each other, so that all the telescopic cylinders cannot drive the ultrasonic probe to rotate, so that the ultrasonic probe keeps a fixed state; when more than M telescopic cylinders are extruded, it indicates that the detection position is at a relatively obvious convex weld position, the hydraulic oil between all the telescopic cylinders will flow to each other, so that all the telescopic cylinders can drive the ultrasonic probe to rotate relative to the fixing frame, so that the ultrasonic probe can keep parallel to the detection surface, so that the ultrasonic probe is prevented from frequently rotating, the stability in the detection process is improved, and then the detection accuracy is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The pipeline inner wall ultrasonic nondestructive testing device provided by the application has the following advantages: first, the at least five telescopic cylinders are uniformly distributed around the ultrasonic probe, so that the ultrasonic probe can keep centered and rotate to realize angle adjustment when encountering a convex weld, compared with the prior art, the angle adjustment of the ultrasonic probe will not lag, thereby the detection accuracy can be improved.

[0020] Figure 2 The pipeline inner wall ultrasonic nondestructive testing device provided by the application has the following advantages: first, the at least five telescopic cylinders are uniformly distributed around the ultrasonic probe, so that the ultrasonic probe can keep centered and rotate to realize angle adjustment when encountering a convex weld, compared with the prior art, the angle adjustment of the ultrasonic probe will not lag, thereby the detection accuracy can be improved.

[0021] Figure 3 The pipeline inner wall ultrasonic nondestructive testing device provided by the application has the following advantages: first, the at least five telescopic cylinders are uniformly distributed around the ultrasonic probe, so that the ultrasonic probe can keep centered and rotate to realize angle adjustment when encountering a convex weld, compared with the prior art, the angle adjustment of the ultrasonic probe will not lag, thereby the detection accuracy can be improved.

[0022] Figure 4 The pipeline inner wall ultrasonic nondestructive testing device provided by the application has the following advantages: first, the at least five telescopic cylinders are uniformly distributed around the ultrasonic probe, so that the ultrasonic probe can keep centered and rotate to realize angle adjustment when encountering a convex weld, compared with the prior art, the angle adjustment of the ultrasonic probe will not lag, thereby the detection accuracy can be improved.

[0023] Figure 5 The pipeline inner wall ultrasonic nondestructive testing device provided by the application has the following advantages: first, the at least five telescopic cylinders are uniformly distributed around the ultrasonic probe, so that the ultrasonic probe can keep centered and rotate to realize angle adjustment when encountering a convex weld, compared with the prior art, the angle adjustment of the ultrasonic probe will not lag, thereby the detection accuracy can be improved.

[0024] Figure 6 The pipeline inner wall ultrasonic nondestructive testing device provided by the application has the following advantages: first, the at least five telescopic cylinders are uniformly distributed around the ultrasonic probe, so that the ultrasonic probe can keep centered and rotate to realize angle adjustment when encountering a convex weld, compared with the prior art, the angle adjustment of the ultrasonic probe will not lag, thereby the detection accuracy can be improved.

[0025] Figure 7 The pipeline inner wall ultrasonic nondestructive testing device provided by the application has the following advantages: first, the at least five telescopic cylinders are uniformly distributed around the ultrasonic probe, so that the ultrasonic probe can keep centered and rotate to realize angle adjustment when encountering a convex weld, compared with the prior art, the angle adjustment of the ultrasonic probe will not lag, thereby the detection accuracy can be improved. Figure 6

[0026] Figure 8 The pipeline inner wall ultrasonic nondestructive testing device provided by the application has the following advantages: first, the at least five telescopic cylinders are uniformly distributed around the ultrasonic probe, so that the ultrasonic probe can keep centered and rotate to realize angle adjustment when encountering a convex weld, compared with the prior art, the angle adjustment of the ultrasonic probe will not lag, thereby the detection accuracy can be improved. Figure 7

[0027] ​​Figure 9 A structure diagram of an ultrasonic probe in an ultrasonic nondestructive testing device for inner wall of a pipeline according to an embodiment of the present application is provided;

[0028] Figure 10 A side view diagram of an ultrasonic detection assembly in an ultrasonic nondestructive testing device for inner wall of a pipeline according to an embodiment of the present application is provided;

[0029] Figure 11 A structure diagram of a fixing frame in an ultrasonic nondestructive testing device for inner wall of a pipeline according to an embodiment of the present application is provided; Figure 10 A sectional view diagram of A-A in the structure diagram;

[0030] Figure 12 A structure diagram of B in the structure diagram; Figure 11 A sectional view diagram of the fixing frame in the ultrasonic nondestructive testing device for inner wall of a pipeline according to an embodiment of the present application is provided;

[0031] Figure 13 A structure diagram of a first hydraulic pipeline and a second hydraulic pipeline on the fixing frame in the ultrasonic nondestructive testing device for inner wall of a pipeline according to an embodiment of the present application is provided.

[0032] Figure 14 A structure diagram of a first hydraulic pipeline and a second hydraulic pipeline on the fixing frame in the ultrasonic nondestructive testing device for inner wall of a pipeline according to an embodiment of the present application is provided.

[0033] Wherein:

[0034] 100, ultrasonic detection joint; 101, fixed sleeve; 1011, articulated lug; 103, ball bearing; 104, tension spring; 105, ultrasonic probe; 106, telescopic rod; 107, hydraulic rod; 108, fixing frame; 1081, semispherical protrusion; 109, guide wheel; 110, compression spring; 111, first hydraulic pipeline; 112, telescopic cylinder; 1121, first adjusting rod; 1122, second adjusting rod; 1123, first adjusting cylinder; 1124, second adjusting cylinder; 1125, first connecting ball; 1126, second connecting ball; 113, second hydraulic pipeline; 114, articulated shaft; 115, fixed cylinder; 117, protruding block; 120, helical groove; 121, first channel; 122, second channel; 200, first universal joint; 300, electronic joint; 400, second universal joint; 500, battery joint. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the present application clearer, further detailed description will be made to the present application by embodiments and in conjunction with the drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0036] The ordinal numbers of components in the specification, such as "first", "second", etc., are merely used to distinguish the described objects, and do not have any sequential or technical meanings. The "connection" and "coupling" in the present application include direct and indirect connections (couplings) unless otherwise specified. In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0037] In the present application, unless otherwise explicitly specified and limited, the "on" or "under" of a first feature to a second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the "over", "above" and "on" of the first feature to the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "under", "below" and "under" of the first feature to the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0038] As Figures 1 to 14As shown, an embodiment of the present application provides an ultrasonic nondestructive testing device for pipeline inner wall, which comprises an ultrasonic detection section 100, the ultrasonic detection section 100 comprises a fixed sleeve 101, and a plurality of ultrasonic probe assemblies are arranged on the circumference of the fixed sleeve 101; the ultrasonic probe assembly comprises a fixed frame 108, an ultrasonic probe 105 and a hydraulic assembly; the fixed frame 108 is hingedly arranged on the fixed sleeve 101, and the length of the fixed frame 108 extends along the axial direction of the fixed sleeve 101; the two ends of the fixed frame 108 along the length direction are both provided with a guide wheel 109, and the guide wheel 109 is used for sliding along the inner wall of the pipeline to be detected; the ultrasonic probe 105 is rotationally arranged at the middle position of the fixed frame 108, and the ultrasonic probe 105 extends along the radial direction of the fixed sleeve 101; the hydraulic assembly comprises N telescopic cylinders 112 connected by a hydraulic system, N≥5, and N is an odd number; the N telescopic cylinders 112 are uniformly distributed around the circumference of the ultrasonic probe 105 and can extend and retract along the radial direction of the fixed sleeve 101; one end of each telescopic cylinder 112 away from the fixed sleeve 101 is provided with a tension spring 104, the tension spring 104 extends along the radial direction of the ultrasonic probe 105 and is connected with the ultrasonic probe 105; when and only when the number M of the telescopic cylinders 112 subjected to extrusion satisfies N-2≤M≤N, the hydraulic system makes the hydraulic oil between the N telescopic cylinders 112 flow to each other, so that the N telescopic cylinders 112 can synchronously slide along the radial direction of the fixed sleeve 101, and then drive the ultrasonic probe 105 to rotate relative to the fixed frame 108 through the tension spring 104.

[0039] Specifically, the ultrasonic nondestructive testing device for pipeline inner wall further comprises a first universal joint 200, an electronic joint 300, a second universal joint 400 and a battery joint 500 connected with the ultrasonic detection section 100 in sequence. The first universal joint 200, the electronic joint 300, the second universal joint 400 and the battery joint 500 all belong to the prior art, and support leather bowls are arranged between the two sides of the ultrasonic detection section 100 and between the second universal joint 400 and the battery joint 500, and rollers are arranged on the support leather bowls, so that the support leather bowls can ensure that the ultrasonic detection section is concentric with the pipeline. The ultrasonic probe 105 adopts electromagnetic ultrasonic principle for detection.

[0040] By uniformly distributing at least five telescopic cylinders 112 around the circumference of the ultrasonic probe 105, the ultrasonic probe 105 can keep centered and rotate to realize angle adjustment when encountering a convex weld, and compared with the prior art, the angle adjustment of the ultrasonic probe 105 will not lag, so that the detection accuracy can be improved.

[0041] In addition, when the convex weld is encountered, the convex weld will extrude the telescopic cylinders 112 on each fixing frame 108. When less than M telescopic cylinders 112 are extruded, it indicates that the convex weld at the detection position is not obvious. At this time, the hydraulic oil between all the telescopic cylinders 112 cannot flow to each other, so that all the telescopic cylinders 112 cannot drive the ultrasonic probe 105 to rotate, so that the ultrasonic probe 105 remains in a fixed state. When more than M telescopic cylinders 112 are extruded, it indicates that the detection position is at a relatively obvious convex weld position. The hydraulic oil between all the telescopic cylinders 112 can flow to each other, so that all the telescopic cylinders 112 can drive the ultrasonic probe 105 to rotate relative to the fixing frame 108, so that the ultrasonic probe 105 can remain parallel to the detection surface. In this way, the ultrasonic probe 105 is prevented from frequently rotating, the stability during the detection process is improved, and the detection accuracy is further ensured.

[0042] Further, the fixing frame 108 is provided with a plurality of fixing cylinders 115 extending radially along the fixing sleeve 101. The number of the fixing cylinders 115 is consistent with that of the telescopic cylinders 112. The telescopic cylinders 112 are slidingly arranged in the corresponding fixing cylinders 115. The fixing cylinders 115 and the telescopic cylinders 112 are filled with hydraulic oil. The fixing cylinders 115 and the telescopic cylinders 112 are provided with compression springs 110. The compression springs 110 have a tendency to make the telescopic cylinders 112 extend out of the fixing cylinders 115. The end of the telescopic cylinders 112 away from the fixing cylinders 115 is rotatably provided with a ball 103. The ball 103 is used to slidingly contact the inner wall of the pipeline.

[0043] The compression spring 110 can provide a continuous pushing force, so that the ball 103 on the telescopic cylinder 112 is always in close contact with the inner wall of the pipeline, facilitating the sliding of the fixing frame 108 on the inner wall of the pipeline. The contact area between the ball 103 and the inner wall of the pipeline is small and the surface is smooth, which can reduce the extrusion and scratching of the inner wall of the pipeline.

[0044] Further, it is defined that the adjacent three fixing cylinders 115 are distributed in the front and rear directions around the circumference of the ultrasonic probe 105. The hydraulic system includes a first hydraulic pipe 111 and a second hydraulic pipe 113 located between the adjacent two fixing cylinders 115. Each telescopic cylinder 112 is provided with a first adjusting member and a second adjusting member. The first adjusting member is used to control the on-off of the first hydraulic pipe 111 between the fixing cylinder 115 and the adjacent front fixing cylinder 115. The second adjusting member is used to control the on-off of the second hydraulic pipe 113 between the fixing cylinder 115 and the adjacent rear fixing cylinder 115. Specifically, the first hydraulic pipe 111 and the second hydraulic pipe 113 are arranged in parallel inside the fixing frame 108.

[0045] Thus, when one telescopic cylinder 112 is pressed, the first adjusting member and the second adjusting member can make the hydraulic oil in the fixed cylinder 115 corresponding to the telescopic cylinder 112 flow into the adjacent two fixed cylinders 115. Thus, when M telescopic cylinders 112 are pressed (i.e. less than two of all the telescopic cylinders 112 are not pressed), the mutual flow of the hydraulic oil among all the telescopic cylinders 112 can be realized.

[0046] Further, the first adjusting member comprises a first adjusting rod 1121 and a first adjusting cylinder 1123, the first adjusting cylinder 1123 extends along the radial direction of the fixed sleeve 101, the first adjusting rod 1121 is an L-shaped rod and is slidingly arranged in the first adjusting cylinder 1123, the first adjusting cylinder 1123 is rotationally arranged in the first hydraulic pipeline 111, and a first channel 121 is formed through the first adjusting cylinder 1123 and can communicate with the first hydraulic pipeline 111; the second adjusting member comprises a second adjusting rod 1122 and a second adjusting cylinder 1124, the second adjusting cylinder 1124 extends along the radial direction of the fixed sleeve 101, the second adjusting rod 1122 is an L-shaped rod and is slidingly arranged in the second adjusting cylinder 1124, the second adjusting cylinder 1124 is rotationally arranged in the second hydraulic pipeline 113, and a second channel 122 is formed through the second adjusting cylinder 1124 and can communicate with the second hydraulic pipeline 113; when the telescopic cylinder 112 is pressed by the inner wall of the pipeline, the telescopic cylinder 112 slides in the corresponding fixed cylinder 115 and compresses the compression spring 110, the telescopic cylinder 112 simultaneously drives the first adjusting rod 1121 to slide in the first adjusting cylinder 1123 and the second adjusting rod 1122 to slide in the second adjusting cylinder 1124, and then the first adjusting cylinder 1123 rotates around its axis to make the first channel 121 communicate with the first hydraulic pipeline 111 and the second adjusting cylinder 1124 rotates around its axis to make the second channel 122 communicate with the second hydraulic pipeline 113.

[0047] Thus, the first hydraulic pipeline 111 and the second hydraulic pipeline 113 are communicated by the compression of the telescopic cylinder 112, without the need of an additional power source, and the structure is simple.

[0048] Further, the first adjusting rod 1121 and the second adjusting rod 1122 are both provided with a lug 117, and the inner wall of the first adjusting cylinder 1123 and the second adjusting cylinder 1124 is provided with a helical groove 120, when the lug 117 slides along the helical groove 120, the first adjusting cylinder 1123 or the second adjusting cylinder 1124 can be driven to rotate around its axis. The lug 117 and the helical groove 120 cooperate to convert the linear motion of the first adjusting rod 1121 and the second adjusting rod 1122 into the rotary motion of the first adjusting cylinder 1123 and the second adjusting cylinder 1124, which is accurate, stable and reliable.

[0049] Further, an end of the first adjusting cylinder 1123 is provided with a first connecting ball 1125, the first adjusting cylinder 1123 is rotatably arranged in the first hydraulic pipeline 111 through the first connecting ball 1125, the first channel 121 is arranged on the first connecting ball 1125, an end of the second adjusting cylinder 1124 is provided with a second connecting ball 1126, the second adjusting cylinder 1124 is rotatably arranged in the second hydraulic pipeline 113 through the second connecting ball 1126, and the second channel 122 is arranged on the second connecting ball 1126.

[0050] In the initial state, the first channel 121 is arranged perpendicularly to the first hydraulic pipeline 111 so as not to be communicated, and the second channel 122 is arranged perpendicularly to the second hydraulic pipeline 113 so as not to be communicated.

[0051] The first hydraulic pipeline 111 and the second hydraulic pipeline 113 are both provided with a spherical groove, so as to facilitate rotation of the first connecting ball 1125 and the second connecting ball 1126.

[0052] Further, the fixing frame 108 is hingedly arranged on the fixing sleeve 101 through a hinged shaft 114, the hinged shaft 114 is perpendicular to an axis of the fixing sleeve 101, the fixing sleeve 101 is provided with a hinged lug 1011, and the hinged shaft 114 is arranged on the hinged lug 1011. In this way, the fixing frame 108 can rotate relative to the fixing sleeve 101, so as to adapt to a raised weld or a curved channel on an inner wall of a pipeline.

[0053] Further, the ultrasonic probe 105 is in a cylindrical structure, a plurality of telescopic rods 106 are distributed in a circumferential direction of the ultrasonic probe 105, each telescopic rod 106 extends in a radial direction of the ultrasonic probe 105, a plurality of hydraulic rods 107 are arranged on the fixing frame 108, each hydraulic rod 107 extends in a radial direction of the fixing sleeve 101, and the telescopic rods 106 and the hydraulic rods 107 are in one-to-one correspondence and are hingedly connected. The hydraulic rod 107 is an independent rod and is not communicated with a hydraulic system. The telescopic rod 106 and the hydraulic rod 107 are arranged, so as to increase rotation resistance of the ultrasonic probe 105, avoid frequent rotation of the ultrasonic probe 105, and further improve detection accuracy.

[0054] Further, the fixing frame 108 is provided with a hemispherical protrusion 1081, and the ultrasonic probe 105 is rotatably arranged on the hemispherical protrusion 1081. The curved surface structure of the hemispherical protrusion 1081 enables the ultrasonic probe 105 to rotate around the hemispherical protrusion 1081 in multiple degrees of freedom, and greatly expands a detection angle range.

[0055] In the embodiment, N is equal to 5. In other embodiments, N is equal to 7 or 9, etc.

[0056] In combination with the above embodiment, a use principle and a working process of the embodiment are as follows:

[0057] The ultrasonic nondestructive testing device for the inner wall of the pipeline is placed in the pipeline and arranged concentrically with the pipeline, so that the guide wheels 109 on the fixing frame 108 and the balls 103 on the telescopic cylinders 112 are in contact with the inner wall of the pipeline. Then the ultrasonic nondestructive testing device for the inner wall of the pipeline is driven to move in the pipeline, so that the ultrasonic detection section 100 detects the inner wall of the pipeline.

[0058] When only two telescopic cylinders 112 are extruded, it indicates that the convex point weld at the detection position is not obvious, at this time, the fixed cylinders 115 corresponding to the two telescopic cylinders 112 are respectively communicated with the adjacent fixed cylinders 115 through the first hydraulic pipeline 111 and the second hydraulic pipeline 113, so that the hydraulic oil in at most four fixed cylinders 115 is communicated, thereby unable to make all telescopic cylinders 112 move, and further unable to drive the ultrasonic probe 105 to rotate, so that the ultrasonic probe 105 remains in a fixed state.

[0059] When three telescopic cylinders 112 are extruded, it indicates that the detection position is at a relatively obvious convex point weld position, at this time, the fixed cylinders 115 corresponding to the three telescopic cylinders 112 are respectively communicated with the adjacent fixed cylinders 115 through the first hydraulic pipeline 111 and the second hydraulic pipeline 113, so that all five fixed cylinders 115 are communicated, thereby enabling all telescopic cylinders 112 to drive the ultrasonic probe 105 to rotate relative to the fixing frame 108, so that the ultrasonic probe 105 can be parallel to the detection surface, thereby avoiding the ultrasonic probe 105 from rotating frequently, improving the stability in the detection process, and further ensuring the detection accuracy.

[0060] The technical features of the above embodiments can be combined arbitrarily, and to make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

[0061] The above embodiments only express several embodiments of the present application, the description is more specific and detailed, but it should not be understood as the limitation of the scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. An ultrasonic non-destructive testing device for the inner wall of a pipe, characterized in that, include: An ultrasonic probe section includes a fixed sleeve, and multiple ultrasonic probe assemblies are arranged circumferentially on the fixed sleeve. The ultrasonic probe assembly includes a mounting frame, an ultrasonic probe, and a hydraulic assembly. The mounting frame is hinged to a mounting sleeve, and the length of the mounting frame extends along the axial direction of the mounting sleeve. Guide wheels are provided at both ends of the mounting frame along the length direction, and the guide wheels are used to slide along the inner wall of the pipe to be tested. The ultrasonic probe is rotatably positioned in the middle of the fixed frame and extends radially along the fixed sleeve. The hydraulic assembly includes N telescopic cylinders interconnected by a hydraulic system, where N≥5 and N is an odd number. The N telescopic cylinders are evenly distributed around the circumference of the ultrasonic probe and can extend and retract radially along the fixed sleeve. Each telescopic cylinder has a tension spring at the end away from the fixed sleeve, which extends radially along the ultrasonic probe and is connected to the ultrasonic probe. The hydraulic system allows hydraulic oil to circulate between the N telescopic cylinders if and only if the number M of the compressed telescopic cylinders satisfies N-2≤M≤N, so that the N telescopic cylinders can slide synchronously along the radial direction of the fixed sleeve, and then drive the ultrasonic probe to rotate relative to the fixed frame through the tension spring. The fixed frame is provided with multiple fixed cylinders extending radially along the fixed sleeve. The number of fixed cylinders is the same as that of telescopic cylinders. The telescopic cylinders are slidably installed in the corresponding fixed cylinders. Hydraulic oil is filled between the fixed cylinders and the telescopic cylinders. A compression spring is provided between the fixed cylinders and the telescopic cylinders. The compression spring has the tendency to extend the telescopic cylinder from the fixed cylinder. A ball bearing is rotatably provided at the end of the telescopic cylinder away from the fixed cylinder. The ball bearing is used to slide in contact with the inner wall of the pipe. The three adjacent fixed cylinders are distributed around the ultrasonic probe in the front-back direction. The hydraulic system includes a first hydraulic line and a second hydraulic line located between two adjacent fixed cylinders. Each telescopic cylinder is provided with a first adjusting component and a second adjusting component. The first adjusting component is used to control the opening and closing of the first hydraulic line between the fixed cylinder and the adjacent previous fixed cylinder, and the second adjusting component is used to control the opening and closing of the second hydraulic line between the fixed cylinder and the adjacent subsequent fixed cylinder. The first adjusting component includes a first adjusting rod and a first adjusting cylinder. The first adjusting cylinder extends radially along the fixed sleeve. The first adjusting rod is an L-shaped rod and is slidably disposed in the first adjusting cylinder. The first adjusting cylinder is rotatably disposed in the first hydraulic pipeline. A first channel is provided through the first adjusting cylinder, which can communicate with the first hydraulic pipeline. The second adjusting component includes a second adjusting rod and a second adjusting cylinder. The second adjusting cylinder extends radially along the fixed sleeve. The second adjusting rod is an L-shaped rod and is slidably disposed in the second adjusting cylinder. The second adjusting cylinder is rotatably disposed in the second hydraulic pipeline. A second channel is provided through the second adjusting cylinder, which can communicate with the second hydraulic pipeline. When the telescopic cylinder is squeezed by the inner wall of the pipe, the telescopic cylinder slides in the corresponding fixed cylinder and compresses the compression spring. At the same time, the telescopic cylinder drives the first adjusting rod to slide in the first adjusting cylinder and the second adjusting rod to slide in the second adjusting cylinder. This causes the first adjusting cylinder to rotate around its own axis to connect with the first hydraulic pipeline in the first channel and the second adjusting cylinder to rotate around its own axis to connect with the second hydraulic pipeline in the second channel.

2. The ultrasonic non-destructive testing device for the inner wall of a pipe according to claim 1, characterized in that, Both the first and second adjusting rods are provided with protrusions, and the inner walls of both the first and second adjusting cylinders are provided with spiral grooves. When the protrusions slide along the spiral grooves, they can drive the first or second adjusting cylinder to rotate around its own axis.

3. The ultrasonic non-destructive testing device for the inner wall of a pipe according to claim 2, characterized in that, The end of the first adjusting cylinder is provided with a first connecting ball, and the first adjusting cylinder is rotatably disposed in the first hydraulic pipeline through the first connecting ball. The first channel is disposed on the first connecting ball. The end of the second adjusting cylinder is provided with a second connecting ball, and the second adjusting cylinder is rotatably disposed in the second hydraulic pipeline through the second connecting ball. The second channel is disposed on the second connecting ball.

4. The ultrasonic non-destructive testing device for the inner wall of a pipe according to claim 1, characterized in that, The fixing bracket is hinged to the fixing sleeve via a hinge shaft, which is perpendicular to the axis of the fixing sleeve.

5. The ultrasonic non-destructive testing device for the inner wall of a pipe according to claim 1, characterized in that, The ultrasonic probe has a cylindrical structure with multiple telescopic rods distributed around its circumference. Each telescopic rod extends radially along the ultrasonic probe. The mounting bracket has multiple hydraulic rods, each extending radially along the mounting sleeve. The telescopic rods and hydraulic rods correspond one-to-one and are hinged together.

6. The ultrasonic non-destructive testing device for the inner wall of a pipe according to claim 5, characterized in that, The mounting bracket has a hemispherical protrusion, and the ultrasonic probe is rotated and fitted onto the hemispherical protrusion.

7. The ultrasonic non-destructive testing device for the inner wall of a pipe according to claim 1, characterized in that, N equals 5.

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