An ultrasonic nondestructive testing device for pressure pipelines

Abstract

The invention discloses an ultrasonic nondestructive testing device for pressure pipelines in the technical field of pipeline quality inspection. The device comprises a fixing frame, a circular assembly hole is passed through the fixing frame, and an annular T-shaped groove is opened on the side wall of the assembly hole. A mounting ring plate is arranged in the assembly hole, and the mounting ring plate is slidably connected with the T-shaped groove through a No. 1 protrusion fixedly arranged on a supporting arm outside the mounting ring plate. An angle shaft is arranged on the mounting ring plate, and a driving wheel is rotatably connected to the bottom of the angle shaft. There is an angle between the driving wheel and the central axis of the assembly hole. A motor is fixedly arranged on the mounting ring plate, and a sliding plate is provided on the mounting ring plate. An ultrasonic detection head is fixedly arranged on the sliding plate. The motor drives the rotation of the driving wheel. The driving wheel interacts with the pressure pipeline, so that the mounting ring plate drives the ultrasonic detection head to perform detection around the pressure pipeline. The invention can comprehensively detect metal pipelines.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline quality inspection, and in particular to an ultrasonic nondestructive inspection device for pressure pipelines. Background Art

[0002] Ultrasonic testing refers to a physical non-destructive testing method that uses ultrasonic waves to directly detect internal defects on metal parts. When testing, the ultrasonic testing device sends ultrasonic waves to the metal parts through the ultrasonic probe, and locates the defects by using the directionality of the ultrasonic waves and the time required for the sound waves to return. There are metal defects such as bubbles and cracks in the metal parts. When the ultrasonic waves encounter different metal defects, the reflected sound waves will also show different physical acoustic phenomena. These physical acoustic signals are then converted into high-frequency electrical pulses by the ultrasonic probe, which can be displayed on the display screen. Finally, the defects are analyzed and characterized based on the characteristics of the reflected flaw detection pulses.

[0003] Pressure pipelines are usually made of metal, so naturally there are metal defects in the above-mentioned metal parts. After production is completed, it is usually necessary to conduct quality inspection on pressure pipelines. Conventional metal flaw detectors on the market are mostly handheld ultrasonic flaw detectors, but metal pipelines have two characteristics. One is that metal pipelines, especially pressure metal pipelines, are mostly circular, and the other is that metal pipelines are usually long. The use of handheld ultrasonic flaw detectors will undoubtedly result in poor work efficiency and waste a lot of manpower. If the pressure pipeline can be synchronously inspected during the final production of the pressure pipeline, a lot of time can be saved. According to the characteristic that the pressure pipeline is usually circular, ultrasonic flaw detectors can be arranged around the metal pipeline, but the flaw detection range of the flaw detector is limited. If a plurality of flaw detectors are arranged around the metal pipeline, this will not only be expensive, but also the flaw detector signal source is very complicated, which makes it easy for the inspector to make mistakes. The present invention enables the detection device to rotate around the pressure pipeline and push the pressure pipeline forward while rotating, so that only one set of ultrasonic flaw detectors is needed to detect the pressure pipeline.

[0004] Based on this, the present invention designs a pressure pipeline ultrasonic nondestructive testing device to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide an ultrasonic nondestructive testing method for pressure pipelines to solve the problem that the flaw detector proposed in the above-mentioned background technology has a limited detection range. If a plurality of flaw detectors are arranged around a metal pipeline, not only is the cost high, but the flaw detector signals are also very complicated, which makes it easy for the inspectors to make mistakes. The present invention enables the detection device to rotate around the pressure pipeline and push the pressure pipeline forward while rotating, so that only one set of ultrasonic flaw detectors is needed to detect the pressure pipeline.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a pressure pipeline ultrasonic nondestructive testing device comprises a fixing frame, the fixing frame is penetrated by a circular assembly hole, the side wall of the assembly hole is provided with an annular T-slot, the center of the assembly hole is provided with a mounting ring plate connected to its arch axis, the outer wall of the mounting ring plate is radially and annularly arranged around its axis, and the support arm matching the T-slot is fixedly arranged on the outer wall of the mounting ring plate and arranged in a radial annular manner, the outer end of the support arm is slidably arranged on the inner wall of the T-slot through a protrusion fixed thereto, the side wall of the mounting ring plate is provided with a plurality of angular axes in a radial annular array around its axis, each end of the angular axis away from the mounting ring plate is rotatably provided with a driving wheel for driving the pipeline through a U-shaped frame fixedly arranged thereon with its end face, the side wall of the mounting ring plate is fixedly connected to a motor, the driving wheel is connected to the motor through a transmission mechanism, the side wall of the mounting ring plate is radially and slidably provided with a plurality of sliding plates corresponding to the driving wheel, and an ultrasonic detection head is fixedly arranged on the end of the sliding plate away from the mounting ring plate.

[0007] As a further solution of the present invention, a synchronization groove is formed on the mounting ring plate, the sliding plate is slidably connected to the synchronization groove, a limit block is fixedly provided on the upper end of the sliding plate for limiting the position when there is no pipeline, an L plate corresponding to the limit block is fixedly provided on the outer wall of the mounting ring plate, a force spring is provided between the limit block and the L plate, and the two ends of the force spring are respectively fixed on the limit block and the side wall of the L plate, a shock-absorbing plate parallel to the axis of the angle shaft is provided on the side wall of the sliding plate close to the angle axis, a synchronization plate is fixedly provided on the side wall of the shock-absorbing plate for maintaining the synchronous displacement of the shock-absorbing plate and the angle shaft, and the angle shaft is rotatably connected to the synchronization plate.

[0008] As a further solution of the present invention, a displacement slider is provided on the outer wall of the mounting ring plate of the side wall of the sliding plate for sliding along its axis, and the outer side of the angle shaft is rotatably provided on the side wall of the mounting ring plate through a spline sleeve that slides axially with the angle shaft, and the outer end of the spline sleeve is fixedly connected to an angle plate, and a compensation groove is opened on the angle plate, and the inner wall of the compensation groove is sleeved on the outer wall of a displacement rod fixedly provided on the side wall of the displacement slider, and when the angle plate rotates, the displacement rod can slide inside the compensation groove, and an angle trigger rod that is respectively rotatably connected to the limit block and the displacement slider is rotatably provided between the side wall of the limit block and the side wall of the displacement slider, and a driving mechanism that can drive the driving wheel to rotate regardless of the rotation angle of the angle shaft is provided on the outer side of the angle shaft.

[0009] As a further solution of the present invention, the driving mechanism includes a receiving bevel gear rotatably arranged on the side wall of the angle shaft, a positioning shaft is fixedly arranged on the side wall of the angle shaft, a positioning bevel gear meshing with the receiving bevel gear is rotatably connected to the positioning shaft, a synchronous shaft is rotatably arranged on the side wall of the shock-absorbing plate, a driving bevel gear meshing with the receiving bevel gear is rotatably connected to the synchronous shaft, the positioning bevel gear and the driving wheel are both coaxially fixed with retaining pulleys, the outer sides of the two retaining pulleys are sleeved with retaining belts, the driving bevel gear and the motor transmission shaft are fixedly connected with a driving pulley, the synchronous shaft and the outer end of the motor output shaft are both coaxially fixed with driving pulleys, and the outer sides of multiple driving pulleys are sleeved with the same power belt.

[0010] As a further solution of the present invention, the sides of the plurality of sliding plates are fixedly connected with gravity rods, the plurality of gravity rods are arranged in a ring and intersect to form a regular polygon, the gravity rods are fixedly connected with anti-gravity blocks at the connection between the gravity rods and the sliding plates, the gravity rods have gravity grooves in the direction parallel to the rods, and the gravity grooves are sleeved on the outer wall of the anti-gravity block adjacent to them.

[0011] As a further solution of the present invention, an elastic groove is provided on the side wall of the sliding plate, the shock-absorbing plate is slidably connected to the inner wall of the elastic groove along the axis of the angle shaft, a compensation spring is provided between the outer end side wall of the shock-absorbing plate and the elastic groove, and the two ends of the compensation spring are respectively fixed on the elastic groove and the side wall of the shock-absorbing plate.

[0012] As a further solution of the present invention, a pressure wheel for tightening the belt is sleeved on the inner side of the power belt between the motor and the two adjacent driving pulleys, and the pressure wheel is rotatably connected to the damping plate.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The present invention has a circular assembly hole passing through a fixing frame, and an annular T-slot is opened on the side wall of the assembly hole. A mounting ring plate is arranged in the assembly hole. The mounting ring plate is slidably connected to the T-slot through a No. 1 protrusion fixedly arranged on a support arm outside the mounting ring plate. An angle shaft is arranged on the mounting ring plate. The bottom of the angle shaft is rotatably connected to a driving wheel. There is an angle between the driving wheel and the central axis of the assembly hole. The driving wheel is driven to rotate by a motor fixed on the mounting ring plate. The motor is fixedly arranged on the mounting ring plate. The driving wheel interacts with the pressure pipeline, so that the mounting ring plate drives the ultrasonic detection head fixed thereon to detect around the pressure pipeline, thereby solving the problem that the flaw detection range of the flaw detector is limited. The method of arranging multiple flaw detectors around the metal pipeline is not only expensive, but also the flaw detector signals are very complicated, which leads to the problem that the detection personnel are prone to make mistakes.

[0015] 2. The present invention is connected by sliding with the mounting ring plate through a sliding plate, a limit block is fixedly provided on the sliding plate, a force spring is provided between the limit block and the L plate fixedly provided on the mounting ring plate, a shock absorbing plate is provided on the side of the sliding plate facing the angle axis, a synchronization plate is fixedly provided on the shock absorbing plate facing the direction of the angle axis and is rotatably connected with the angle axis, so that even if the pipe diameter changes, the driving wheel can be in close contact with the surface of the pressure pipe, so that the detection of the pressure pipe by the detection device will not be affected by the change of the pipe diameter of the pipe.

[0016] 3. In the present invention, when the diameter of the pressure pipeline changes, the limit block moves radially outward, the limit block pulls the angle trigger rod, the angle trigger rod pulls the displacement slider, the displacement slider slides along the No. 3 groove toward the limit block, the anti-gravity block drives the angle plate to rotate toward the limit block, the angle plate drives the spline sleeve to rotate, the spline sleeve drives the angle shaft to rotate, and the angle shaft drives the driving wheel to rotate, so that when the diameter of the pipe increases, the angle between the traveling wheel and the traveling direction of the pressure pipeline will also increase, thereby solving the problem of incomplete detection of the pressure pipeline caused by the increase in the diameter of the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 for Figure 1 The local enlarged schematic diagram at A in the middle;

[0019] Figure 3 for Figure 1 The local enlarged schematic diagram at B in the middle;

[0020] Figure 4 It is a front structural schematic diagram of the present invention;

[0021] Figure 5 for Figure 4 The local enlarged schematic diagram at C in the middle;

[0022] Figure 6 for Figure 4 The local enlarged schematic diagram at D in the middle;

[0023] Figure 7 for Figure 4 The local enlarged schematic diagram at E in the middle;

[0024] Figure 8 for Figure 4 The local enlarged schematic diagram at F in the middle;

[0025] Fig. 9 It is a schematic diagram of the transmission structure of the sliding plate and the driving wheel;

[0026] Fig.10Schematic diagram of the forces acting on the driving wheel on the pressure pipe.

[0027] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0028] Fixed frame 1, assembly hole 2, T-slot 3, mounting ring plate 4, support arm 5, protrusion 6, angle shaft 7, driving wheel 8, motor 9, sliding plate 10, ultrasonic detection head 11, synchronous groove 12, limit block 13, L plate 14, force spring 15, shock absorbing plate 16, synchronous plate 17, displacement slider 19, spline sleeve 20, angle plate 21, compensation groove 22, angle trigger rod 23, receiving bevel gear 25, positioning shaft 26, positioning bevel gear 27, synchronous shaft 28, driving bevel gear 29, retaining pulley 30, retaining belt 31, driving pulley 32, power belt 33, gravity rod 34, anti-gravity block 35, gravity groove 36, elastic groove 37, compensation spring 38, clamping wheel 39. DETAILED DESCRIPTION

[0029] See also Figure 1-10 The present invention provides a technical solution: a pressure pipeline ultrasonic nondestructive testing device, comprising a fixing frame 1, the fixing frame 1 is penetrated by a circular assembly hole 2, the side wall of the assembly hole 2 is provided with an annular T-shaped groove 3, the center of the assembly hole 2 is provided with a mounting ring plate 4 with its arch axis, the outer wall of the mounting ring plate 4 is radially and annularly arranged around its axis and fixed with a support arm 5 matching with the T-shaped groove 3, the outer end of the support arm 5 is slidably arranged on the inner wall of the T-shaped groove 3 through a protrusion 6 fixed thereto, the side wall of the mounting ring plate 4 is radially and annularly arranged around its axis and a plurality of angle shafts 7 are arranged, each of which is away from the mounting ring plate 4. One end of the angle shaft 7 is rotatably provided with a driving wheel 8 for driving the pipeline through a U-shaped frame fixedly provided with its end face, the side wall of the mounting ring plate 4 is fixedly connected with a motor 9, the driving wheel 8 is connected with the motor 9 through a transmission mechanism, the side wall of the mounting ring plate 4 is radially and slidably provided with a plurality of sliding plates 10 corresponding to the driving wheel 8, and an ultrasonic detection head 11 is fixedly provided on the end of the sliding plate 10 away from the mounting ring plate 4;

[0030] When the pressure pipeline is completed, it is necessary to inspect the pressure pipeline. The pressure pipeline is transported to the center of the assembly hole 2 of the pressure pipeline ultrasonic nondestructive testing device (such as Figure 1 As shown) and in contact with multiple sets of driving wheels 8, (the axis of the driving wheel 8 falls on a concentric circle parallel to the front and rear end surfaces of the mounting ring plate 4. This arrangement is to ensure that the force exerted by each driving wheel 8 on the circular pressure pipe is consistent, preventing the pressure pipe from being deformed due to the detection device.) At this time, the motor 9 drives the driving wheel 8 to rotate, and there is an angle between the driving wheel 8 and the travel direction of the pressure pipe (and Figure 3 and Fig.10As shown, direction A is the traveling direction of the pressure pipe, direction B is the rotation direction of the driving wheel 8, and angle a refers to the angle between direction A and direction B. At this time, the pressure pipe cannot rotate due to the action of the front and rear clamps. When the driving wheel 8 rotates, the friction with the pressure pipe generates a force F on the driving wheel 8 that is opposite to direction A. The rotating frame will drive the ultrasonic detection head 11 on the sliding plate 10 to rotate around the pressure pipe for detection. At the same time, the pressure pipe also moves linearly in direction A. This solves the problem that the flaw detector has a limited detection range. If multiple flaw detectors are arranged around the metal pipe, this will not only be costly, but the flaw detector signals will also be very complicated, leading to the problem that detection personnel are prone to make mistakes.

[0031] The present invention enables the detection device to rotate around the pressure pipeline and push the pressure pipeline forward while rotating, so that only one set of ultrasonic flaw detectors is needed to perform comprehensive detection on the pressure pipeline, thereby avoiding the problem of detection blind spots.

[0032] As a further solution of the present invention, a synchronous groove 12 is formed on the mounting ring plate 4, the sliding plate 10 is slidably connected to the synchronous groove 12, a limit block 13 for limiting when there is no pipeline is fixedly provided on the upper end of the sliding plate 10, an L plate 14 corresponding to the limit block 13 is fixedly provided on the outer wall of the mounting ring plate 4, a force spring 15 is provided between the limit block 13 and the L plate 14, and the two ends of the force spring 15 are respectively fixedly provided on the side walls of the limit block 13 and the L plate 14, a damping plate 16 parallel to the axis of the angle shaft 7 is provided on the side wall of the sliding plate 10 close to the angle shaft 7, a synchronous plate 17 for maintaining the synchronous displacement of the damping plate 16 and the angle shaft 7 is fixedly provided on the side wall of the damping plate 16, and the angle shaft 7 is rotatably connected to the synchronous plate 17;

[0033] In actual industrial production, a group of production lines can often produce multiple types of pressure pipes. Therefore, if the detection device can raise and lower the driving wheel 8 according to the thickness of the pressure pipe, the driving wheel 8 can fit the outer surface of the pressure pipes of different types to detect the pressure pipes. Figure 3 , Figure 6 and Figure 4As shown, when the thickness of the pressure pipeline changes, the driving wheel 8 is subjected to the radial outward squeezing force of the pressure pipeline, and the driving wheel 8 drives the angle shaft 7 to move radially outward, and the angle shaft 7 drives the shock absorbing plate 16 to move radially outward through the synchronous plate 17 rotatably connected thereto, and the shock absorbing plate 16 drives the sliding plate 10 to move radially outward. At this time, the force spring 15 applies a radial inward elastic force to the limit block 13 fixed on the upper end of the sliding plate 10 (the purpose of installing the limit block 13 above the sliding plate 10 is to clamp the upper end of the synchronous groove 12 when the detection device is in an unloaded state due to no pipeline detection, so as to prevent the sliding plate 10 from falling from the lower end of the synchronous groove 12, causing the detection device to fail to work.) Finally, the elastic force acts on the driving wheel 8, so that even if the pipe diameter changes, the driving wheel 8 can be in close contact with the surface of the pressure pipeline, so that the detection of the pressure pipeline by the detection device will not be affected by the change in the pipe diameter of the pipeline.

[0034] As a further solution of the present invention, a displacement slider 19 is slidably provided on the outer wall of the mounting ring plate 4 of the side wall of the sliding plate 10 along its axis, and the outer side of the angle shaft 7 is rotatably provided on the side wall of the mounting ring plate 4 through a spline sleeve 20 axially sliding therewith, and an angle plate 21 is fixedly connected to the outer end of the spline sleeve 20, and a compensation groove 22 is provided on the angle plate 21, and the inner wall of the compensation groove 22 is sleeved on the outer wall of the displacement rod fixedly provided on the side wall of the displacement slider 19, and when the angle plate 21 rotates, the displacement rod can slide inside the compensation groove 22, and an angle trigger rod 23 rotatably connected to the limit block 13 and the displacement slider 19 is rotatably provided between the side wall of the limit block 13 and the side wall of the displacement slider 19, and a driving mechanism for driving the driving wheel 8 to rotate regardless of the rotation angle of the angle shaft 7 is provided on the outer side of the angle shaft 7;

[0035] As a further solution of the present invention, the driving mechanism includes a receiving bevel gear 25 rotatably arranged on the side wall of the angle shaft 7, a positioning shaft 26 is fixedly arranged on the side wall of the angle shaft 7, a positioning bevel gear 27 meshing with the receiving bevel gear 25 is rotatably connected to the positioning shaft 26, a synchronous shaft 28 is rotatably arranged on the side wall of the damping plate 16, a driving bevel gear 29 meshing with the receiving bevel gear 25 is rotatably connected to the synchronous shaft 28, the positioning bevel gear 27 and the driving wheel 8 are coaxially fixed with a retaining pulley 30, the outer sides of the two retaining pulleys 30 are sleeved with a retaining belt 31, the driving bevel gear 29 and the transmission shaft of the motor 9 are fixedly connected with a driving pulley 32, the synchronous shaft 28 and the outer end of the output shaft of the motor 9 are coaxially fixed with a driving pulley 32, and the outer sides of multiple driving pulleys 32 are sleeved with the same power belt 33;

[0036] When the pressure pipe is used as a stationary reference, the ultrasonic detection head 11 on the detection device is equivalent to performing a spiral scan around the pressure pipe. If the driving wheel 8 is fixed, that is, the angle a does not change, then when the diameter of the pressure pipe changes, the spiral line changes proportionally with the change in the diameter, and the pitch of the spiral line also changes proportionally. When the diameter increases, the pitch also increases. The detection range of the ultrasonic detection head 11 is limited. When the width of the pitch is greater than the detection range of the ultrasonic detection head 11, areas that cannot be detected by the ultrasonic detection head 11 will appear on the pipeline, and a comprehensive detection of the pipeline cannot be completed. If you want to conduct a comprehensive detection of the pipeline, you must ensure that the width of the above-mentioned pitch is always smaller than the detection range of the ultrasonic detection head 11. Figure 7 , Fig. 9 and Fig.10 As shown, when the diameter of the pressure pipe increases, the limit block 13 moves radially outward, the limit block 13 pulls the angle trigger rod 23, the angle trigger rod 23 pulls the displacement slider 19, the displacement slider 19 slides along the third groove toward the direction close to the limit block 13, the anti-gravity block 35 drives the angle plate 21 to rotate toward the direction close to the limit block 13, and the angle plate 21 drives the spline sleeve 20 to rotate (the compensation groove 22 is provided on the angle plate 21 so that the displacement slider 19 slides in the compensation groove 22 because the displacement slider 19 drives the rotation of the angle plate 21 to cause the spline sleeve 20 to rotate. During the rotation of 20, the distance from the displacement slider 19 to the central axis of the spline sleeve 20 changes. A compensation groove 22 is opened in the angle plate 21 to prevent the displacement slider 19 from getting stuck when driving the angle plate 21 to rotate). The spline sleeve 20 drives the rotation of the angle shaft 7 (the angle shaft 7 and the spline sleeve 20 are key-connected, and the sliding function of the angle shaft 7 in the spline sleeve 20 is that the spline sleeve 20 drives the angle shaft 7 to rotate without hindering the angle shaft 7 from driving the driving wheel 8 to move along the radial direction of the pressure pipe). The angle shaft 7 drives the rotation of the driving wheel 8 (such as Fig. 9As shown, by fixing the synchronous shaft 28 on the damping plate 16 to rotate and connect the active bevel gear 29, the power belt 33 is used to drive the rotation of the active pulley 32 to drive the rotation of the active bevel gear 29, the active bevel gear 29 drives the rotation of the receiving bevel gear 25, the receiving bevel gear 25 drives the rotation of the positioning bevel gear 27, the positioning bevel gear 27 is rotatably connected with the positioning shaft 26, and the positioning bevel gear 27 will rotate synchronously with the rotation of the angle shaft 7. According to the characteristics of the bevel gear transmission, when the positioning bevel gear 27 rotates, it will not affect the transmission between the bevel gears, thereby ensuring that even when the steering direction of the driving wheel 8 changes, the transmission process of the detection device can still be carried out steadily without being affected), so that the angle a becomes larger. When the angle a becomes larger, the pitch of the helix will become smaller. In summary, when the above device is used, when the pipe diameter becomes larger, the angle a will increase synchronously, and the phenomenon of the increase in pitch caused by the increase in pipe diameter will be offset by the increase in angle a, thereby ensuring that the above pitch is always within the detection range of the detection head, so that the detection device can always perform comprehensive detection of the pressure pipeline.

[0037] As a further solution of the present invention, the sides of the plurality of sliding plates 10 are fixedly connected with gravity rods 34, and the plurality of gravity rods 34 are arranged in a ring and intersect to form a regular polygon. The gravity rods 34 are fixedly connected with anti-gravity blocks 35 at the connection between the gravity rods 34 and the sliding plates 10. The gravity rods 34 are provided with gravity grooves 36 in the direction parallel to the rods, and the gravity grooves 36 are sleeved on the outer walls of the anti-gravity blocks 35 adjacent thereto.

[0038] When the detection device detects the pressure pipeline, if the radial movement of the driving wheel 8 can be carried out synchronously, the pipeline detection process of the device can naturally be made more stable. Figure 4 and Figure 6 As shown, under the constraint of the gravity groove 36, the anti-gravity block 35 can only slide in the gravity groove 36, and the sliding plate 10 can only move radially along the synchronous groove 12 along the pressure pipe under the constraint of the synchronous groove 12, and the gravity rod 34 and the anti-gravity block 35 are fixed on the sliding plate 10, so that the sliding plates 10 located from each vertex of the polygon to its geometric center will constrain the adjacent sliding plates 10, realizing the synchronous movement between the sliding plates 10, so that the driving wheel 8 can realize the synchronous movement in the radial direction of the pressure pipe, thereby improving the stability of the detection device for pipeline detection.

[0039] As a further solution of the present invention, an elastic groove 37 is provided on the side wall of the sliding plate 10, and the damping plate 16 is slidably connected to the inner wall of the elastic groove 37 along the axis of the angle shaft 7, and a compensation spring 38 is provided between the outer end side wall of the damping plate 16 and the elastic groove 37, and the two ends of the compensation spring 38 are respectively fixedly arranged on the elastic groove 37 and the side wall of the damping plate 16;

[0040] When the pressure pipe is just processed, its surface is often attached with metal debris, and the driving wheel 8 moves synchronously in the radial direction of the pressure pipe. When one of the driving wheels 8 contacts the metal debris, the driving wheel 8 will move outward, and at the same time, it will drive the other driving wheels 8 to move outward synchronously, so that a gap will be generated between the other driving wheels 8 and the pressure pipe. At this time, the driving wheel 8 cannot act on the surface of the pressure pipe, and the ultrasonic detection head 11 will also be in the principle of the surface of the pressure pipe to a certain extent, which will cause short-term detection failure. In order to avoid this phenomenon, Fig. 9 As shown, when a certain driving wheel 8 touches metal debris, the angle shaft 7 will drive the synchronous plate 17 to move upward, and the synchronous plate 17 will drive the damping plate 16 to slide in the elastic groove 37. At the same time, under the top pressure of the compensation spring 38, the damping plate 16 will not have a hard collision with the sliding plate 10, thereby avoiding the situation where the driving wheel 8 drives the sliding plate 10 to jump when touching the metal debris at a certain place. After the driving wheel 8 passes over the metal debris, the driving wheel 8 returns to its original position under the top pressure of the compensation spring 38.

[0041] As a further solution of the present invention, a clamping wheel 39 for tightening the belt is sleeved on the inner side of the power belt 33 between the motor 9 and the two adjacent driving pulleys 32, and the clamping wheel 39 is rotatably connected to the damping plate 16;

[0042] During the process of the detection device detecting the pressure pipeline, in order to enable the power belt 33 to always drive the driving pulley 32 to rotate, as shown in FIG. Figure 2 As shown in FIG. 1 , the pressure wheels 39 provided on the sides of the first driving pulley 32 and the last driving pulley 32 connected to the second belt can keep the power belt 33 in close contact with the driving pulley 32. Furthermore, since most conventional belts are hard belts, when the diameter of the pressure pipe changes, the distance between the driving pulleys 32 will also change. In order to ensure that the length of the power belt 33 can always meet the transmission requirements, as shown in FIG. Figure 8 As shown, when the diameter of the pressure pipe becomes larger, under the pulling force of the power belt 33, the No. 3 pulley 43 will slide the No. 3 slider 41 downward to release the excess power belt 33. When the diameter of the pressure pipe becomes smaller, the No. 3 slider 41 will slide upward under the elastic force of the No. 3 spring 42 to tighten the power belt 33. In this way, even if the diameter of the pressure pipe being tested changes, the tightness of the belt drive can still be met.

Claims

1. An ultrasonic nondestructive testing device for a pressure pipeline, comprising a fixing frame (1), characterized in that: The fixing frame (1) is provided with a circular assembly hole (2), and a circular T-shaped groove (3) is formed on the side wall of the assembly hole (2). A mounting ring plate (4) connected to the arch axis is arranged in the center of the assembly hole (2). The outer wall of the mounting ring plate (4) is provided with support arms (5) matching the T-shaped groove (3) in a radial annular array around the axis. The outer end of the support arm (5) is slidably arranged on the inner wall of the T-shaped groove (3) via a protrusion (6) fixed thereto. The side wall of the mounting ring plate (4) is provided with a plurality of radial annular arrays around the axis. An angle shaft (7), one end of each angle shaft (7) away from the mounting ring plate (4) is rotatably provided with a driving wheel (8) for driving the pipeline through a U-shaped frame fixedly provided on the end surface thereof, a motor (9) is fixedly connected to the side wall of the mounting ring plate (4), the driving wheel (8) and the motor (9) are connected through a transmission mechanism, a plurality of sliding plates (10) corresponding to the driving wheels (8) are radially slidably provided on the side wall of the mounting ring plate (4), and an ultrasonic detection head (11) is fixedly provided on the end of the sliding plate (10) away from the mounting ring plate (4); The mounting ring plate (4) is provided with a synchronization groove (12), the sliding plate (10) is slidably connected to the synchronization groove (12), a limit block (13) for limiting when there is no pipeline is fixedly arranged on the upper end of the sliding plate (10), an L plate (14) corresponding to the limit block (13) is fixedly arranged on the outer wall of the mounting ring plate (4), a force spring (15) is arranged between the limit block (13) and the L plate (14), the two ends of the force spring (15) are respectively fixedly arranged on the side walls of the limit block (13) and the L plate (14), a damping plate (16) parallel to the axis of the angle shaft (7) is arranged on the side wall of the sliding plate (10) close to the angle shaft (7), a synchronization plate (17) for maintaining the synchronous displacement of the damping plate (16) and the angle shaft (7) is fixedly arranged on the side wall of the damping plate (16), and the angle shaft (7) is rotatably connected to the synchronization plate (17); The outer wall of the mounting ring plate (4) of the side wall of the sliding plate (10) is provided with a displacement slider (19) slidingly arranged along its axis; the outer side of the angle shaft (7) is rotationally arranged on the side wall of the mounting ring plate (4) through a spline sleeve (20) axially sliding therewith; the outer end of the spline sleeve (20) is fixedly connected with an angle plate (21); a compensation groove (22) is provided on the angle plate (21); the inner wall of the compensation groove (22) is sleeved on the outer wall of a displacement rod fixedly arranged on the side wall of the displacement slider (19); and when the angle plate (21) rotates, the displacement rod can slide inside the compensation groove (22); an angle trigger rod (23) rotationally arranged between the side wall of the limit block (13) and the side wall of the displacement slider (19) and respectively connected to the limit block (13) and the displacement slider (19); and a driving mechanism for driving the driving wheel (8) to rotate regardless of the rotation angle of the angle shaft (7) is provided on the outer side of the angle shaft (7); The driving mechanism comprises a receiving bevel gear (25) rotatably arranged on the side wall of the angle shaft (7); a positioning shaft (26) is fixedly arranged on the side wall of the angle shaft (7); a positioning bevel gear (27) meshing with the receiving bevel gear (25) is rotatably connected to the positioning shaft (26); a synchronizing shaft (28) is rotatably arranged on the side wall of the damping plate (16); a driving bevel gear (29) meshing with the receiving bevel gear (25) is rotatably connected to the synchronizing shaft (28); The bevel gear (27) and the driving wheel (8) are both coaxially fixedly provided with a retaining pulley (30), and the outer sides of the two retaining pulleys (30) are sleeved with a retaining belt (31). The driving bevel gear (29) and the transmission shaft of the motor (9) are fixedly connected with a driving pulley (32), and the outer ends of the synchronous shaft (28) and the output shaft of the motor (9) are both coaxially fixedly provided with a driving pulley (32), and the outer sides of the plurality of driving pulleys (32) are sleeved with a same power belt (33).

2. The pressure pipeline ultrasonic nondestructive testing device according to claim 1 is characterized in that: The sides of the plurality of sliding plates (10) are fixedly connected with gravity rods (34), the plurality of gravity rods (34) are arranged in a ring and intersect to form a regular polygon, the gravity rods (34) are fixedly connected with anti-gravity blocks (35) at the connection between the gravity rods (34) and the sliding plates (10), the gravity rods (34) are provided with gravity grooves (36) along a direction parallel to the rods, and the gravity grooves (36) are sleeved on the outer walls of the anti-gravity blocks (35) adjacent to the gravity rods (34).

3. The pressure pipeline ultrasonic nondestructive testing device according to claim 2 is characterized in that: The side wall of the sliding plate (10) is provided with an elastic groove (37), the damping plate (16) is slidably connected to the inner wall of the elastic groove (37) along the axis of the angle shaft (7), a compensation spring (38) is provided between the outer end side wall of the damping plate (16) and the elastic groove (37), and two ends of the compensation spring (38) are respectively fixedly arranged on the elastic groove (37) and the side wall of the damping plate (16).

4. The pressure pipeline ultrasonic nondestructive testing device according to claim 3 is characterized in that: A pressure wheel (39) for tightening the belt is sleeved on the inner side of the power belt (33) between the motor (9) and the two adjacent driving pulleys (32), and the pressure wheel (39) is rotatably connected to the damping plate (16).

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