An online detection device for thick-walled pipe weld defects

Abstract

The present invention belongs to the technical field of pipeline weld detection, and discloses an online detection device for thick-walled pipeline weld defects, including a workbench, a hydraulic cylinder 1 and a support ring, the telescopic end of the hydraulic cylinder 1 is installed with a work frame, the internal rotation of the work frame is installed with two groups of transport rollers, and a motor 1 is installed, and the two groups of transport rollers are connected to the motor 1 through a gear set. The device enters the sensing area between the micro gratings upward through the baffle bar, and automatically shuts down the hydraulic cylinder 3 through the controller to maintain the constant compression distance of the spring 2 by the limit ring. When the ultrasonic probe faces workpieces of different sizes, it only needs to adjust the telescopic stroke of the hydraulic cylinder 3 and move the baffle bar to the specified position to keep the compression stroke of the spring 2 unchanged, so that the pressure between the ultrasonic probe and the workpiece surface is constant, avoiding excessive pressure and causing excessive wear on the bottom surface of the ultrasonic probe, thereby extending the service life of the device.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline weld detection, and in particular relates to an online detection device for thick-wall pipeline weld defects. Background Art

[0002] Thick-walled pipes are generally key materials for the energy transportation industry and the nuclear power industry with high pressure properties. Their wall thickness is usually greater than or equal to 20 mm. Thick-walled pipes need to be welded when connected. In order to detect whether there are cracks, gaps and other welding defects in the welds of the welding parts, it is necessary to set up an online detection device. On the inspection line, the successfully welded thick-walled pipes will be moved to the inspection station and defect detection will be carried out using the ultrasonic principle. Ultrasonic inspection is a method of detecting welding defects using ultrasonic waves. During the propagation of ultrasound in the welding area, information such as reflection, refraction and attenuation can be detected, thereby judging the welding quality. In the prior art, for pipeline weld detection, an ultrasonic probe with an inclined design is generally placed at the weld area and abutted against it to realize the ultrasonic generation detection function. When the ultrasonic probe is in contact with the weld, it is easy to produce excessive wear due to the relative movement of the two. The ultrasonic probe needs to abut against the weld surface to detect defects in the weld. In the prior art, the ultrasonic probe will directly contact the pipeline under the drive of the hydraulic rod. Such a design easily leads to uncontrollable contact pressure between the ultrasonic probe and the pipeline. If it is too small, it cannot be detected, and if it is too large, it will cause damage to the ultrasonic probe. In addition, when facing pipelines of different sizes, the ultrasonic probe cannot be rotated and adjusted in angle, and cannot fully adapt to the weld on the pipeline surface, resulting in the failure of the online detection function. Summary of the invention

[0003] The object of the present invention is to provide an online detection device for thick-walled pipeline weld defects to solve the problems raised in the above background technology.

[0004] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: an online detection device for thick-walled pipe weld defects, comprising a workbench, a hydraulic cylinder 1 and a support ring, a work frame is installed at the telescopic end of the hydraulic cylinder 1, two groups of transport rollers are rotatably installed inside the work frame, and a motor 1 is installed, the two groups of transport rollers are connected to the motor 1 through a gear set, a workpiece is placed on the upper surface of the transport roller, a top plate is installed on the top of the support ring, a hydraulic cylinder 2 is installed on the top of the top plate, a connecting plate is fixedly connected to the telescopic end of the hydraulic cylinder 2, two groups of positioning mechanisms are symmetrically installed on both sides of the bottom of the connecting plate along the axis of the support ring, a hydraulic cylinder 3 is fixedly installed in the middle of the bottom surface of the connecting plate, and a fixed plate is fixedly connected to the telescopic end of the hydraulic cylinder 3, The front and rear sides of the bottom of the fixed plate are fixedly connected with connecting columns, the bottom of the connecting column is movably hinged with a hinge block, the bottom of the hinge block is fixedly connected with an ultrasonic probe, the top of the ultrasonic probe is fixedly connected with a slide on one side away from the hinge block, the front and rear sides of the top of the fixed plate are movably inserted with through columns, the bottom of the through column is fixedly connected with a clamping column, the clamping column is slidably installed in the slide, a limiting ring is fixedly installed on the bottom of the outer surface of the through column, the outer surface of the through column is movably sleeved with a spring 2 located at the bottom of the fixed plate, the two ends of the spring 2 are elastically connected to the fixed plate and the limiting ring respectively, a group of micro gratings are installed on the front side of the top of the fixed plate, and a baffle located in the micro grating sensing area is fixedly connected to the front side of the outer surface of the through column on the front side.

[0005] As a preferred solution of the present invention, the support rings are provided in two groups and are symmetrically distributed on both sides of the top of the workbench along the axis of the workpiece, and three groups of transport mechanisms are fixedly installed on the inner ring surface of the support ring;

[0006] The transport mechanism includes a accommodating cylinder fixedly connected to the inner ring surface of the supporting ring, a spring 1 and a telescopic column are movably sleeved inside the accommodating cylinder, two ends of the spring 1 are elastically connected to the accommodating cylinder and the telescopic column respectively, the telescopic column is elastically supported inside the accommodating cylinder by the spring 1, and a roller 1 is fixedly connected to an outer end of the telescopic column, which is located at the top. The transport mechanism also includes a motor 2, which is transmission-connected to the roller 1, and the outer surface of the roller 1 abuts against the surface of the workpiece.

[0007] As a preferred solution of the present invention, the positioning mechanism includes a fixed column fixedly connected to the bottom of the connecting plate, a rotating column is rotatably installed at the bottom of the fixed column, a second roller is fixedly connected to the bottom end of the rotating column, and the outer surface of the second roller abuts against the surface of the workpiece.

[0008] As a preferred solution of the present invention, a limit plate is fixedly connected to the bottom of the outer side of the connecting column, and the limit plate abuts against the outer side of the hinge block when the ultrasonic probe and the connecting column remain vertical.

[0009] As a preferred solution of the present invention, the ultrasonic probe, the slide and the hinge block can rotate upward around the axis of the hinge between the hinge block and the connecting column, and the clamping column can slide back and forth along the inner wall of the slide.

[0010] As a preferred solution of the present invention, the second spring is compressed and arranged between the fixed plate and the limiting ring to generate a rebound force, and the rebound force is fully applied to the surface of the workpiece through the clamping column, the slide and the ultrasonic probe.

[0011] As a preferred solution of the present invention, the bottom surface of the ultrasonic probe is tangent to the surface of the workpiece and the abutting pressure is kept constant, and the distance by which the second spring is compressed can always remain unchanged.

[0012] As a preferred solution of the present invention, the larger the size of the workpiece is, the smaller the angle between the bottom of the ultrasonic probe abutting against the size and the horizontal plane is.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1. This device has been redesigned so that the contact pressure between the ultrasonic probe and the workpiece can be automatically kept constant, avoiding excessive wear of the bottom of the ultrasonic probe caused by excessive pressure between the ultrasonic probe and the workpiece. The positioning mechanism fixedly connected to the bottom of the connecting plate is in contact with the top of the workpiece, so that the distance between the ultrasonic probe and the workpiece is constant in a horizontal state, so that the hydraulic cylinder only needs to drive the fixed plate downward as a whole, drive the bottom surface of the ultrasonic probe to contact the surface of the workpiece, and rotate around the axis of the hinged joint of the hinge block and the connecting column under the limiting effect of the workpiece, and drive the clamping column and the through column upward through the slide. , limit ring and baffle, and compress spring 2, so that the ultrasonic probe generates pressure while rotating and abutting against the surface of the workpiece, enters the sensing area between the micro-gratings upward through the baffle, and automatically shuts down hydraulic cylinder 3 through the controller to maintain a constant compression distance of spring 2 by the limit ring. When the ultrasonic probe faces workpieces of different sizes, it only needs to adjust the telescopic stroke of hydraulic cylinder 3 and move the baffle to the specified position to keep the compression stroke of spring 2 unchanged, so that the pressure between the ultrasonic probe and the surface of the workpiece is constant, avoiding excessive pressure, causing excessive wear on the bottom surface of the ultrasonic probe, and extending the service life of the device.

[0015] 2. The device is provided with multiple groups of transport mechanisms located on the inner wall of the support ring to assist in workpiece feeding and rotation detection. The motor 2 located at the top drives the roller 1 at the top to rotate, and the workpiece is driven to move along the transport direction with the cooperation of the working frame and the transport roller. A pair of telescopic columns with springs are provided for elastic support, so that the device can adapt to workpieces of different sizes. Then, the transport rollers are driven to rotate by the motor 1, driving the workpiece to rotate around the axis of the support ring, thereby driving multiple groups of rollers 1 to rotate 90° around the axis of the telescopic columns connected to them respectively, and generating rotational tension on the spring 1 in the spiral direction of the spring 1, so that the spring 1 has the elastic force to drive the telescopic column and roller 1 to return to the normal position. When the working frame moves downward to a position abutting the surface of the workpiece, the elastic force of the spring 1 drives the roller 1 and the telescopic column to rotate and reset, and then the workpiece is driven to be unloaded by the motor 2.

[0016] 3. The device is provided with a positioning mechanism, so that the workpiece can complete the automatic centering function under the elastic support of the transport mechanism and the rigid support of the transport roller. By providing multiple groups of transport mechanisms, the workpiece is elastically supported, and the roller one and the telescopic column compress the spring one to generate a rebound force and elastically support the surface of the workpiece. The connecting plate and the positioning mechanism are driven downward by the hydraulic cylinder two, so that the distance between the bottom of the roller two and the axis of the support ring is equal to the radius of the workpiece. In this way, the work frame and the transport roller are driven upward by the hydraulic cylinder one to support the workpiece and offset the gravity of the workpiece itself, so that the workpiece is in contact with the bottom of the roller two. At this time, the two groups of springs one on the lower side are only subjected to the limiting pressure from the surface of the workpiece, so that all the springs one are compressed to the same distance, thereby realizing the precise automatic centering function of the device, which is helpful for the subsequent online detection operation of the device. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 2 For the present invention Figure 1 A magnified schematic diagram of the structure at center A;

[0019] Figure 3 It is a side perspective schematic diagram of the overall structure of the present invention;

[0020] Figure 4 For the present invention Figure 3 A magnified schematic diagram of the structure at B in the middle;

[0021] Figure 5 It is a side cutaway schematic diagram of the overall structure of the present invention;

[0022] Figure 6 For the present invention Figure 5 A magnified schematic diagram of the structure at C in the middle;

[0023] Figure 7 It is a schematic diagram of the structural coordination of the connecting plate, the positioning mechanism, the third hydraulic cylinder, the fixing plate, the connecting column, the hinge block, the ultrasonic probe, the slide, the through column, the clamping column, the limiting ring, the second spring, the limiting plate, the micro grating and the baffle bar of the present invention;

[0024] Figure 8 It is a schematic diagram of the separation of hydraulic cylinder 3, fixing plate, connecting column, hinge block, ultrasonic probe, slide, through column, clamping column, limit ring, spring 2, limit plate, micro grating and baffle of the present invention;

[0025] Fig. 9 It is a schematic diagram of the separation of the transport mechanism of the present invention.

[0026] In the figure: 1. workbench; 2. hydraulic cylinder 1; 3. work frame; 4. transport roller; 5. motor 1; 6. support ring; 7. transport mechanism; 71. accommodating cylinder; 72. spring 1; 73. telescopic column; 74. roller 1; 75. motor 2; 8. connecting plate; 9. positioning mechanism; 91. fixed column; 92. rotating column; 93. roller 2; 10. top plate; 11. hydraulic cylinder 2; 12. hydraulic cylinder 3; 13. fixed plate; 14. connecting column; 15. hinge block; 16. ultrasonic probe; 17. slide; 18. through column; 19. clamping column; 20. limit ring; 21. spring 2; 22. limit plate; 23. micro grating; 24. baffle. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] like Figures 1 to 9As shown, an embodiment of the present invention provides an online detection device for thick-walled pipe weld defects, including a workbench 1, a hydraulic cylinder 2 and a support ring 6, a telescopic end of the hydraulic cylinder 2 is installed with a work frame 3, two sets of transport rollers 4 are rotatably installed inside the work frame 3, and a motor 5 is installed, the two sets of transport rollers 4 are transmission-connected to the motor 5 through a gear set, a workpiece is placed on the upper surface of the transport roller 4, a top plate 10 is installed on the top of the support ring 6, a hydraulic cylinder 2 11 is installed on the top of the top plate 10, a connecting plate 8 is fixedly connected to the telescopic end of the hydraulic cylinder 2 11, two sets of positioning mechanisms 9 are symmetrically installed on both sides of the bottom of the connecting plate 8 along the axis of the support ring 6, a hydraulic cylinder 3 12 is fixedly installed in the middle of the bottom surface of the connecting plate 8, the telescopic end of the hydraulic cylinder 3 12 is fixedly connected to a fixed plate 13, and the front and rear sides of the bottom of the fixed plate 13 are fixed A connecting column 14 is connected, and a hinge block 15 is movably hinged at the bottom of the connecting column 14. An ultrasonic probe 16 is fixedly connected to the bottom of the hinge block 15. A slide 17 is fixedly connected to the side of the top of the ultrasonic probe 16 away from the hinge block 15. A through column 18 is movably inserted at the front and rear sides of the top of the fixed plate 13. A clamping column 19 is fixedly connected to the bottom of the through column 18. The clamping column 19 is slidably installed in the slide 17. A limiting ring 20 is fixedly installed at the bottom of the outer surface of the through column 18. A spring 21 located at the bottom of the fixed plate 13 is movably sleeved on the outer surface of the through column 18. The two ends of the spring 21 are elastically connected to the fixed plate 13 and the limiting ring 20 respectively. A group of micro gratings 23 are installed on the front side of the top of the fixed plate 13. A blocking bar 24 located in the sensing area of ​​the micro grating 23 is fixedly connected to the front of the outer surface of the front through column 18.

[0029] The device has been redesigned so that the contact pressure between the ultrasonic probe 16 and the workpiece can be automatically kept constant, avoiding excessive wear of the bottom of the ultrasonic probe 16 caused by excessive pressure between the ultrasonic probe 16 and the workpiece. The positioning mechanism 9 fixedly connected to the bottom of the connecting plate 8 is in contact with the top of the workpiece, so that the distance between the ultrasonic probe 16 and the workpiece is constant in a horizontal state, so that the hydraulic cylinder 12 only needs to drive the fixing plate 13 to move downward as a whole, drive the bottom surface of the ultrasonic probe 16 to contact the surface of the workpiece, and rotate around the axis of the hinged joint of the hinge block 15 and the connecting column 14 under the limiting effect of the workpiece, and drive the clamping column 19, the through column 18, and the limiting column 19 upward through the slide 17. The ring 20 and the baffle 24 are used to compress the spring two 21, so that the ultrasonic probe 16 generates pressure while rotating and abutting against the surface of the workpiece, and enters the sensing area between the micro-gratings 23 upward through the baffle 24, and the hydraulic cylinder three 12 is automatically shut down by the controller to maintain a constant compression distance of the spring two 21 by the limiting ring 20. When the ultrasonic probe 16 faces workpieces of different sizes, it is only necessary to adjust the telescopic stroke of the hydraulic cylinder three 12 and move the baffle 24 to the specified position to keep the compression stroke of the spring two 21 unchanged, so that the pressure between the ultrasonic probe 16 and the surface of the workpiece is constant, avoiding excessive pressure, causing excessive wear on the bottom surface of the ultrasonic probe 16, and extending the service life of the device.

[0030] The support rings 6 are provided in two groups and are symmetrically distributed on both sides of the top of the workbench 1 along the axis of the workpiece. Three groups of transport mechanisms 7 are fixedly installed on the inner ring surface of the support ring 6.

[0031] The transport mechanism 7 includes a receiving tube 71 fixedly connected to the inner ring surface of the support ring 6, a spring 72 and a telescopic column 73 are movably sleeved inside the receiving tube 71, two ends of the spring 72 are elastically connected to the receiving tube 71 and the telescopic column 73 respectively, the telescopic column 73 is elastically supported inside the receiving tube 71 by the spring 72, and a roller 74 is fixedly connected to the outer end of the telescopic column 73. The transport mechanism 7 located at the top also includes a motor 75, which is transmission-connected to the roller 74, and the outer surface of the roller 74 abuts against the surface of the workpiece;

[0032] The device is provided with multiple groups of transport mechanisms 7 located on the inner wall of the support ring 6 to assist in workpiece feeding and rotation detection, and is provided with a motor 2 75 located at the top to drive the top roller 1 74 to rotate, and with the cooperation of the working frame 3 and the transport roller 4, the workpiece is driven to move along the transport direction, and a spring 1 72 is provided to elastically support the telescopic column 73, so that the device can adapt to workpieces of different sizes, and then, the transport roller 4 is driven to rotate by the motor 1 5, and the workpiece is driven to rotate around the axis of the support ring 6, thereby driving multiple groups of rollers 1 74 to rotate 90° around the axis of the telescopic column 73 connected to each other, and generating rotational tension on the spring 1 72 in the spiral direction of the spring 1 72, so that the spring 1 72 has the elastic force to drive the telescopic column 73 and the roller 1 74 to return to the normal position, and when the working frame 3 moves downward to a position abutting the surface of the workpiece, the elastic force of the spring 1 72 drives the roller 1 74 and the telescopic column 73 to rotate and reset, and then, driven by the motor 2 75, the workpiece is driven to be unloaded.

[0033] The positioning mechanism 9 includes a fixed column 91 fixedly connected to the bottom of the connecting plate 8, a rotating column 92 is rotatably mounted on the bottom of the fixed column 91, a second roller 93 is fixedly connected to the bottom end of the rotating column 92, and the outer surface of the second roller 93 abuts against the surface of the workpiece;

[0034] The device is provided with a positioning mechanism 9, so that the workpiece can complete the automatic centering function under the elastic support of the transportation mechanism 7 and the rigid support of the transportation roller 4. By providing multiple groups of transportation mechanisms 7, the workpiece is elastically supported, and the roller 74 and the telescopic column 73 compress the spring 72 to generate a rebound force and elastically support the surface of the workpiece. The connecting plate 8 and the positioning mechanism 9 are driven downward by the hydraulic cylinder 11, so that the distance between the bottom of the roller 93 and the axis of the support ring 6 is equal to the radius of the workpiece. In this way, the work frame 3 and the transportation roller 4 are driven upward by the hydraulic cylinder 2 to support the workpiece and offset the gravity of the workpiece itself, so that the workpiece is in contact with the bottom of the roller 93. At this time, the two groups of springs 72 on the lower side are only subjected to the limiting pressure from the surface of the workpiece, so that all the springs 72 are compressed to the same distance, thereby realizing the precise automatic centering function of the device and facilitating the subsequent online detection operation of the device.

[0035] The bottom of the outer side of the connecting column 14 is fixedly connected to the limiting plate 22, and the limiting plate 22 abuts against the outer side of the hinge block 15 when the ultrasonic probe 16 and the connecting column 14 are kept in a vertical state;

[0036] When the ultrasonic probe 16 is not in contact with the workpiece surface, it abuts against the limit plate 22 through the hinge block 15, so that its lowest position is in a horizontal state, which facilitates its rapid abutment with the workpiece surface.

[0037] The ultrasonic probe 16, the slide 17 and the hinge block 15 can rotate upward around the axis of the hinge between the hinge block 15 and the connecting column 14, and the clamping column 19 can slide forward and backward along the inner wall of the slide 17;

[0038] When the ultrasonic probe 16 abuts against the surface of the workpiece, it will rotate under the support and limiting action of the workpiece, and the rotation will push the through column 18 up a certain distance, and drive the limiting ring 20 to compress the spring two 21 to generate a rebound force. Since the ultrasonic probe 16 will rotate and adjust under the drive of the hydraulic cylinder three 12, and through the induction adjustment of the baffle bar 24 and the micro grating 23, the rebound force generated by the compression of the spring two 21 is constant (that is, the distance that the spring two 21 is compressed is constant), so that the contact pressure between the ultrasonic probe 16 and the workpiece surface required for detection remains constant, avoiding excessive damage to the ultrasonic probe 16.

[0039] The second spring 21 is compressed and arranged between the fixing plate 13 and the limiting ring 20 to generate a rebound force, and the rebound force is fully applied to the surface of the workpiece through the clamping column 19, the slide 17 and the ultrasonic probe 16;

[0040] The spring 21 drives the through column 18 and the limit ring 20 to move upward through the ultrasonic probe 16 and is compressed to generate a rebound force, which acts on the surface of the workpiece, so that the contact pressure generated by the ultrasonic probe 16 and the workpiece ensures that it can complete effective ultrasonic testing.

[0041] The bottom surface of the ultrasonic probe 16 is tangent to the surface of the workpiece, and the abutting pressure is kept constant, so that the distance by which the spring 21 is compressed can always remain constant;

[0042] The contact pressure between the ultrasonic probe 16 and the surface of the workpiece needs to be kept constant, so that the ultrasonic probe 16 can effectively generate and receive ultrasonic waves, ensuring the normal detection function of the weld defects on the workpiece surface.

[0043] The larger the size of the workpiece, the smaller the angle between the bottom of the ultrasonic probe 16 abutting against the size and the horizontal plane;

[0044] When the ultrasonic probe 16 contacts workpieces of different sizes, different angles will be generated. Since the surface curvatures of different workpieces are different, the ultrasonic probe 16 will be driven to produce different rotation angles. At this time, it is only necessary to control the extension and retraction of the hydraulic cylinder 3 12 to compensate for the excessive compression of the spring 2 21 caused by the movement of the limit ring 20 caused by the rotation of the ultrasonic probe 16.

[0045] Working principle:

[0046] First, input the workpiece size to the controller, start the hydraulic cylinder 2 11, and drive the connecting plate 8, the hydraulic cylinder 3 12 and the positioning mechanism 9 to move to the specified height, so that the distance between the bottom of the roller 2 93 and the axis of the support ring 6 is equal to the radius of the workpiece. At this time, the ultrasonic probe 16 is higher than the bottom of the roller 2 93, and the workpiece is passed through the support ring 6 on the right side along the axis of the support ring 6, so that its surface abuts against the multiple groups of rollers 1 74 on the right side, and the multiple groups of springs 1 72 on the right side are compressed synchronously to generate a supporting force for the workpiece, and a group of motors 2 75 on the right side are started, and the roller 1 74 on the top is driven to rotate, so that the workpiece moves to the other side along the transportation direction until the workpiece contacts the multiple groups of transportation mechanisms 7 on the left side and forms a support;

[0047] Then, the hydraulic cylinder 1 2 is started, and the working frame 3 and the transport roller 4 are driven upward to abut against the bottom of the workpiece, and the workpiece is pushed upward to abut against the outer surface of the roller 2 93. At this time, all the springs 1 72 are compressed to the same distance, and the workpiece and the support ring 6 are coaxially distributed;

[0048] Finally, the hydraulic cylinder 3 12 is started, and the fixing plate 13 is driven to move downward, so that the ground of the ultrasonic probe 16 abuts against the outer surface of the workpiece, and begins to rotate upward around the axis of the hinged joint of the hinge block 15 and the connecting column 14, and pushes the through column 18 and the limit ring 20 upward through the slide 17, and compresses the spring 21 to generate a downward rebound force. The through column 18 will drive the baffle 24 to move while moving upward. When the baffle 24 moves to the sensing area between the micro gratings 23, the baffle 24 will send a signal to the controller, and the controller will immediately respond to stop. The hydraulic cylinder 3 12 is stopped. At this time, the ultrasonic probe 16 can detect defects in the weld of the workpiece, start the motor 1 5, and drive the two sets of transport rollers 4 to rotate, drive the workpiece, the roller 2 93 and the roller 1 74 to rotate, and the roller 1 74 will drive the telescopic column 73 to rotate around its own axis under the drive of the workpiece, and drive the spring 1 72 to rotate 90° around its spiral direction, and the roller 2 93 will drive the rotating column 92 to rotate 90° around the axis of the fixed column 91, and then drive the workpiece to rotate relative to the bottom surface of the ultrasonic probe 16, so as to achieve all-round detection;

[0049] When the size of the workpiece becomes larger, the angle between the bottom surface of the ultrasonic probe 16 and the surface of the workpiece will change. At this time, the angle between the ultrasonic probe 16 and the connecting column 14 will become smaller under the limit of the workpiece, thereby causing the through column 18 to drive the baffle 24 upward and make the baffle 24 leave the sensing area between the micro-gratings 23. At the same time, the compression distance of the spring 21 increases due to the upward movement of the limit ring 20 driven by the through column 18. At this time, the control hydraulic cylinder 3 12 drives the fixed plate 13 to move downward as a whole, so that the through column 18 and the limit ring 20 move downward relative to the micro-grating 23 under the elastic force of the spring 21, until the baffle 24 re-enters the sensing area between the micro-gratings 23, it can be confirmed that the compression distance of the spring 21 remains unchanged. At this time, the abutment pressure between the ultrasonic probe 16 and the workpiece remains constant.

[0050] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0051] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An online detection device for thick-walled pipe weld defects, comprising a workbench (1), a hydraulic cylinder (2) and a support ring (6), wherein a work frame (3) is installed at the telescopic end of the hydraulic cylinder (2), two groups of transport rollers (4) are rotatably installed inside the work frame (3), and a motor (5) is installed, the two groups of transport rollers (4) are connected to the motor (5) through a gear set, and a workpiece is placed on the upper surface of the transport roller (4), characterized in that: A top plate (10) is mounted on the top of the support ring (6), a hydraulic cylinder 2 (11) is mounted on the top of the top plate (10), the telescopic end of the hydraulic cylinder 2 (11) is fixedly connected to a connecting plate (8), two sets of positioning mechanisms (9) are symmetrically mounted on both sides of the bottom of the connecting plate (8) along the axis of the support ring (6), a hydraulic cylinder 3 (12) is fixedly mounted on the middle of the bottom surface of the connecting plate (8), the telescopic end of the hydraulic cylinder 3 (12) is fixedly connected to a fixing plate (13), the front and rear sides of the bottom of the fixing plate (13) are fixedly connected to connecting columns (14), the bottom of the connecting column (14) is movably hinged to a hinge block (15), the bottom of the hinge block (15) is fixedly connected to an ultrasonic probe (16), the top of the ultrasonic probe (16) is away from the hinge block A slide (17) is fixedly connected to one side of the fixed plate (15), a through column (18) is movably inserted at both the front and rear sides of the top of the fixed plate (13), a clamping column (19) is fixedly connected to the bottom of the through column (18), and the clamping column (19) is slidably installed in the slide (17), a limit ring (20) is fixedly installed at the bottom of the outer surface of the through column (18), a spring 2 (21) located at the bottom of the fixed plate (13) is movably sleeved on the outer surface of the through column (18), and the two ends of the spring 2 (21) are elastically connected to the fixed plate (13) and the limit ring (20) respectively, a group of micro gratings (23) are installed on the front side of the top of the fixed plate (13), and a blocking bar (24) located in the sensing area of ​​the micro grating (23) is fixedly connected to the front side of the outer surface of the through column (18) located at the front side.

2. The on-line detection device for thick-walled pipe weld defects according to claim 1 is characterized in that: The support rings (6) are arranged in two groups and are symmetrically distributed on both sides of the top of the workbench (1) along the axis of the workpiece, and three groups of transport mechanisms (7) are fixedly mounted on the inner ring surface of the support ring (6); The transport mechanism (7) comprises a housing cylinder (71) fixedly connected to the inner annular surface of the support ring (6); a spring (72) and a telescopic column (73) are movably sleeved inside the housing cylinder (71); two ends of the spring (72) are elastically connected to the housing cylinder (71) and the telescopic column (73) respectively; the telescopic column (73) is elastically supported inside the housing cylinder (71) by the spring (72); an outer end of the telescopic column (73) is fixedly connected to a roller (74) located at the top; the transport mechanism (7) further comprises a motor (75) which is transmission-connected to the roller (74); the outer surface of the roller (74) abuts against the surface of the workpiece.

3. The on-line detection device for thick-walled pipe weld defects according to claim 2 is characterized in that: The positioning mechanism (9) comprises a fixed column (91) fixedly connected to the bottom of the connecting plate (8), a rotating column (92) being rotatably mounted on the bottom of the fixed column (91), a second roller (93) being fixedly connected to the bottom end of the rotating column (92), and an outer surface of the second roller (93) abutting against a surface of a workpiece.

4. The on-line detection device for thick-walled pipe weld defects according to claim 3 is characterized in that: The bottom of the outer side surface of the connecting column (14) is fixedly connected to a limiting plate (22), and when the ultrasonic probe (16) and the connecting column (14) are kept in a vertical state, the limiting plate (22) abuts against the outer side surface of the hinge block (15).

5. The on-line detection device for thick-walled pipe weld defects according to claim 4 is characterized in that: The ultrasonic probe (16), the slide (17) and the hinge block (15) can rotate upward around the axis of the hinge between the hinge block (15) and the connecting column (14), and the clamping column (19) can slide back and forth along the inner wall of the slide (17).

6. The on-line detection device for thick-walled pipe weld defects according to claim 5, characterized in that: The second spring (21) is compressed and arranged between the fixing plate (13) and the limiting ring (20) to generate a rebound force, and the rebound force is fully applied to the surface of the workpiece through the clamping column (19), the slide (17) and the ultrasonic probe (16).

7. The on-line detection device for thick-walled pipe weld defects according to claim 6, characterized in that: The bottom surface of the ultrasonic probe (16) is tangent to the surface of the workpiece and maintains a constant abutment pressure, so that the distance by which the second spring (21) is compressed can always remain constant.

8. The on-line detection device for thick-walled pipe weld defects according to claim 7, characterized in that: The larger the size of the workpiece, the smaller the angle between the bottom of the ultrasonic probe (16) abutting against the size and the horizontal plane.

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