Pressure steel pipe weld detection device and detection method

Abstract

The application discloses a pressure steel pipe weld joint detection device and a detection method. The device comprises a base, a plurality of rotating units are arranged on the upper end surface of the base, a placing unit is fixedly connected with the base and arranged in the middle of the plurality of rotating units, a fixing frame is fixedly arranged on the rear side of each rotating unit, two corresponding positioning discs are fixedly arranged on the front side of the fixing frame, a threaded rod which can move along the axial direction of the positioning disc is arranged in the positioning disc, one end of one threaded rod is provided with an external detection unit, and one end of the other threaded rod is provided with an internal detection unit. The application can detect the weld joints of steel pipes with different specifications at a fixed distance and simultaneously detect the inside and outside of the steel pipes.

Description

Technical Field

[0001] The present invention relates to the technical field of weld detection, in particular to a device and method for detecting welds of a pressure steel pipe. Background Art

[0002] Penstock is a type of pipe used to transport water energy, typically in facilities such as hydropower stations. The welds on the pipe bear the main pressure and load of the pipe. The quality of the welds directly affects the safety and reliability of the entire pipe system, so they need to be inspected.

[0003] The prior art discloses a Chinese patent application number CN202311825984.2, a metal welded pipe weld detection device, and discloses driving the corresponding probe No. 1 and probe No. 2 to change height, so that during the process of probe No. 1 and probe No. 2 detecting the weld, the effective distance between probe No. 1 and probe No. 2 and the weld can be maintained, thereby maintaining the stability of the ultrasonic detection signal.

[0004] Although the above device can adjust the distance between the probe and the weld when detecting the weld, it still has some defects in use:

[0005] 1. Since the distance between the top of the steel pipe and the detection head is different when testing steel pipes of different diameters and thicknesses, it is impossible to accurately and control the distance between the detection head and the weld;

[0006] 2. When inspecting the welds of pipe fittings, the above device can only inspect the welds on the outside of the pipe, so the quality of the welds inside the steel pipe cannot be guaranteed. Summary of the Invention

[0007] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a pressure steel pipe weld detection device and detection method to solve the technical problems proposed in the above-mentioned background technology of performing fixed-distance detection on the welds of steel pipes of different specifications and performing synchronous detection on the inside and outside of the steel pipe.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is: a pressure steel pipe weld detection device, including a base, a plurality of rotating units are provided on the upper end surface of the base, a placement unit fixedly connected to the base is provided in the middle of the plurality of rotating units, and a fixing frame fixed to the base is provided on the rear side of each group of rotating units, and two corresponding positioning plates are fixedly installed on the front side of the fixing frame, and a threaded rod that can move along the axial direction of the positioning plate is provided in the positioning plate, wherein an external detection unit is installed at one end of one threaded rod, and an internal detection unit is installed at one end of the other threaded rod.

[0009] Preferably, a rotating sleeve is rotatably installed on the inner side of the positioning plate, and a gear ring is fixedly installed on the outside of the rotating sleeve. The inner side of the rotating sleeve is threadedly connected to the threaded rod, and a cross slot is opened on the fixing frame, and a cross plate fixedly connected to the threaded rod is slidably installed in the cross slot. A synchronous plate is provided on the rear side of the positioning plate, and the synchronous plate is fixedly connected to the two cross plates. A rotating shaft rotatably connected to the fixing frame is provided between the two positioning plates, and one end of the rotating shaft is fixedly installed with a driving wheel meshing with the upper and lower gear rings. Pulleys are provided on multiple rotating shafts, and belts are used to drive the pulleys. A motor is provided on the rear side of the fixing frame in the middle, and the output end of the motor is connected to the rotating shaft in the middle. An external detection unit is installed at one end of the upper threaded rod, and an internal detection unit is installed at one end of the lower threaded rod.

[0010] Preferably, the rotating unit includes two symmetrically arranged moving frames, the bottom of the moving frame is slidably connected to the base, a turntable is rotatably installed on the inner side of the upper part of the moving frame, a plurality of circumferentially arranged adjustment slots are provided on the turntable, a driving ring is rotatably installed on one side of the turntable, a plurality of circumferentially arranged adjustment plates are hinged on the outside of the driving ring, an end of the adjustment plate away from the driving ring is rotatably installed with a shaft placed in the adjustment slot, a plurality of circumferentially arranged L-shaped plates are slidably installed on the side of the turntable away from the driving ring, the plurality of L-shaped plates are respectively connected to the corresponding shafts, and a splint is installed on one side of the L-shaped plate.

[0011] Preferably, the placement unit includes a rectangular frame, the upper end surface of the rectangular frame is provided with a plurality of placement slots corresponding to the rotating units, the placement slots are arranged in an inverted trapezoidal shape, the inner cavity of the rectangular frame is provided with a plurality of lifting slots corresponding to the placement slots, a supporting plate is slidably installed in the lifting slot, a front slot connected to the lifting slot is provided on the front side of the placement slot, connecting plates are slidably installed in the multiple front slots, the connecting plates are respectively fixedly connected to the multiple supporting plates, a cylinder is fixedly installed on one side of the rectangular frame, and the telescopic end of the cylinder is fixedly connected to the connecting plate.

[0012] Preferably, the external detection unit includes a top frame fixedly connected to one end of a threaded rod, a plurality of external sleeves are fixedly installed on the lower end surface of the top frame, an internal plate is slidably installed on the inner cavity of the external sleeve, and U-shaped frames are fixedly installed on both sides of the lower end surface of the internal plate, and the lower parts of the two U-shaped frames are fixedly installed with outer arc frames with hollow structures, a limit stopper is installed on the bottom side of the U-shaped frame, a lifting plate is slidably installed between the outside of the limit stopper and the U-shaped frame, a spring is installed between the top of the lifting plate and the top of the U-shaped frame, and an inner arc plate with a hollow structure in the middle is installed between the lower ends of the lifting plates on both sides.

[0013] Preferably, the inner arc plate is located on the inner side of the outer arc frame and slides with it. A first detection head fixed to the lower end of the inner plate is provided between the two U-shaped frames. The first detection head passes through the hollow area of ​​the outer arc frame and the inner arc plate. A group of symmetrically arranged rotating frames are provided on both sides of the outer arc frame. A cleaning roller is installed between each group of rotating frames for common rotation. An electric push rod is hinged on one side of the U-shaped frame. The end of the electric push rod away from the U-shaped frame is hinged to the rotating frame. A control panel is fixedly installed on one side of the outer arc frame.

[0014] Preferably, a rotating rod is installed in the middle of the top frame through motor rotation, and multiple lifting frames are fixedly installed on the rotating rod. The multiple lifting frames correspond one by one to the external sleeves below them. A lifting groove is opened in the middle of the lifting frame, and the lifting groove is located outside the protruding rods on both sides of the built-in plate and is sleeved on them.

[0015] Preferably, a side plate is fixedly installed on one side of the outer sleeve, a movable groove is opened on the side of the side plate close to the outer sleeve, a movable plate is slidably installed in the movable groove, a spring is installed between the top of the movable plate and the movable groove, a contact plate arranged in a circular arc is fixedly installed on the bottom of the movable plate, a hydraulic rod is fixedly installed on the top of the movable plate, an end plate is fixedly installed on the top of the hydraulic rod, and a connecting rod is installed on one side of the end plate.

[0016] Preferably, a limit plate for controlling the downward movement distance of the control plate is fixedly installed on the top of the connecting rod, a scale is fixedly installed on one side of the side plate, and a pointer fixed to the end plate is provided on the front side of the scale. Through the setting of the scale and the pointer, the hydraulic rod can accurately control the lifting distance of the limit plate, and then when the external detection unit moves downward, the limit plate blocks the control plate, so that the external detection unit can perform accurate ultrasonic detection of steel pipes of different thicknesses at different distances.

[0017] Preferably, the internal detection unit includes a circular plate corresponding to the external detection unit one by one, the circular plate is fixedly connected to the end of the threaded rod on the lower side, and a plurality of annularly arranged radial telescopic blocks are slidably installed in the radial direction on the outer circumference of the circular plate, a hollow abutment plate is fixedly installed on one end of the radial telescopic block, and a regulating disk is rotatably installed on one side of the circular plate, and a plurality of radially inclined arc grooves are provided on the regulating disk, and a cylindrical shaft fixedly connected to the inner end side of the radial telescopic block is provided in the arc groove, and a second detection head fixed to the outer end of the radial telescopic block is provided on one side of the middle of the abutment plate.

[0018] In addition, the present invention also discloses a detection method of the above-mentioned penstock weld detection device, comprising the following steps:

[0019] S1: Steel pipe fixing:

[0020] The steel pipe to be inspected for welds is placed in the placement unit, and then the rotating units on both sides are controlled to move closer to each other until the pipe walls on both sides of the steel pipe are clamped. The rotation of the rotating unit drives the steel pipe to rotate, so that the external inspection unit and the internal inspection unit can synchronously perform uniform and comprehensive weld inspection on the inside and outside of the steel pipe.

[0021] S2: Synchronous detection of internal and external welds of steel pipes:

[0022] The motor is turned on to drive the rotating shaft to rotate. When the rotating shaft rotates, it drives multiple rotating shafts to rotate simultaneously through the pulley and belt. When the rotating shaft rotates, it drives the upper and lower gear rings to rotate through the driving wheel, so that the rotating sleeve rotates inside the positioning plate. Since the rotating sleeve is threadedly connected to the threaded rod, and the cross plate at the rear end of the threaded rod slides back and forth in the cross groove, when the rotating sleeve rotates, the upper and lower threaded rods respectively drive the external detection unit and the internal detection unit to move synchronously. At this time, the internal detection unit enters the interior of the steel pipe and cooperates with the external detection unit to perform synchronous detection of the inside and outside of the steel pipe;

[0023] S3: Ultrasonic distance detection of the outside of the steel pipe:

[0024] After the external detection unit moves to the top of the weld of the steel pipe, the movable plate drives the contact plate to abut the outer wall of the steel pipe under the action of the spring. Due to the different thicknesses of different steel pipes, when the contact plate abuts the outside of the steel pipe, the hydraulic rod is controlled to open and the pointer moves on the scale, thereby adjusting the distance between the limit plate and the contact plate. After adjusting the distance between the limit plate and the contact plate, when the outer arc frame and the control plate move downward, the limit plate blocks and limits the downward distance of the control plate, so that the first detection head on the upper part of the outer arc frame can perform accurate distance detection on the weld on the outside of the steel pipe.

[0025] Beneficial effects of the present invention:

[0026] 1. The present invention drives two moving frames to approach each other through a driving mechanism until the moving frames on both sides are located at the two ends of the steel pipe, and then drives the driving ring to rotate through the driving mechanism. When the driving ring rotates, the adjustment plate drives multiple shafts to slide in the adjustment groove. At this time, the multiple L-shaped plates move away from each other until the multiple L-shaped plates drive the clamping plates to clamp the ends of the steel pipe, thereby achieving the fixation of the steel pipe during weld detection, and after the driving mechanism is turned on, it drives the turntable to rotate in the moving frame, so that the steel pipe can be rotated as a whole, so as to achieve uniform inspection of the external welds of the steel pipe. Compared with the existing device, the present invention can clamp the pipe walls at both ends of the steel pipe when testing the welds of steel pipes of different lengths, and can rotate the steel pipe as a whole, so that the circumferential welds on the outer wall of the steel pipe can be uniformly ultrasonically detected.

[0027] 2. The present invention opens the cylinder to extend and retract, and when the cylinder extends and retracts, it drives the connecting plate to rise and fall. When the connecting plate rises and falls, it simultaneously drives multiple supporting plates to rise and fall in the lifting groove. By lifting and lowering the supporting plate, it can be supported and placed with the bottom end of the steel pipe, thereby achieving stable support for the bottom end of the placed steel pipe when steel pipes of different diameters are placed in the placement groove. Compared with the existing device, the present invention can meet the stable placement of steel pipes of different specifications before testing through the provided placement groove and supporting plate, thereby making the steel pipe more stable during weld inspection, and effectively avoiding sliding of the steel pipe after being subjected to external force during placement.

[0028] 3. The present invention drives the rotating rod to rotate by turning on the motor, and the rotating rod rotates and the lifting frame rotates synchronously. When the lifting frame rotates, the built-in plate moves downward in the outer sleeve, and when the built-in plate moves downward, the outer arc frame and the U-shaped frame are simultaneously driven downward. When the outer arc frame moves downward, due to the setting of the spring in the U-shaped frame, the inner arc plate is first in contact with the steel pipe, and then the first detection head is turned on to detect the weld below the inner arc plate. The hollow setting of the inner arc plate can not only not affect the weld detection by the first detection head, but also facilitate the shielding of areas outside the weld. Since the first detection head determines whether there are defects inside the weld by detecting the reflection of sound waves in the weld, shielding the area around the weld can effectively avoid interference around the weld causing inaccurate detection results. Compared with the existing weld detection device, the present invention can reduce interference outside the weld by blocking the weld.

[0029] 4. The electric push rod of the present invention pushes forward, and the rotating frame flips when the electric push rod is pushed forward. When the rotating frame flips to the point where the cleaning roller contacts the weld of the steel pipe, since the weld under the inner arc plate is arranged in a circumferential direction, when the steel pipe rotates, the cleaning roller can clean the circumferentially rotating weld, so that the cleaned weld is successively placed under the inner arc plate for detection by the first detection head. Compared with the existing device, the present invention cleans the weld that is about to enter under the inner arc plate by first contacting the cleaning roller when rotating, thereby effectively avoiding impurities on the weld from generating additional reflected waves when the first detection head performs ultrasonic detection on the weld, thereby affecting the accuracy of the detection result.

[0030] 5. The control plate of the present invention moves down to contact with the limit plate. At this time, the limit plate blocks the control plate. At this time, the control plate and the outer arc frame cannot move down. The distance between the first detection head and the weld remains stable. By adjusting the spacing between the contact plate and the limit plate, the distance between the first detection head and the weld can be effectively controlled. After the contact plate contacts the outside of the steel pipe where the weld needs to be inspected, the present invention controls the lifting and lowering of the limit plate, thereby realizing fixed-distance detection between the first detection head and the weld, effectively solving the problem of inaccurate detection values ​​due to the different spacing between steel pipes of different diameters and thicknesses and the external detection unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall front structure of the present invention;

[0032] Figure 2 It is a schematic diagram of the local structure of the present invention;

[0033] Figure 3 It is a schematic diagram of the placement unit structure of the present invention;

[0034] Figure 4 It is a schematic diagram of a partial side sectional structure of the present invention;

[0035] Figure 5 This invention Figure 4 A schematic diagram of the enlarged structure of part A;

[0036] Figure 6 It is a schematic diagram of the rear structure of the turntable of the present invention;

[0037] Figure 7 It is a schematic diagram of the front structure of the turntable of the present invention;

[0038] Figure 8 Schematic diagram of the structure of the external detection unit of the present invention;

[0039] Figure 9 It is a schematic diagram of the side cross-sectional structure of the external detection unit of the present invention;

[0040] Figure 10 This is a schematic diagram of the inner structure of the side plate of the present invention;

[0041] Figure 11 It is a schematic diagram of the structure of the internal detection unit of the present invention.

[0042] The reference numerals in the figures are as follows:

[0043] 1. Base; 21. Moving frame; 22. Turntable; 23. Adjustment slot; 24. Drive ring; 25. Adjustment plate; 26. Shaft; 27. L-shaped plate; 271. Clamp; 3. Rectangular frame; 31. Placement slot; 32. Lifting slot; 33. Support plate; 34. Front slot; 35. Connecting plate; 36. Cylinder; 4. Fixed frame; 41. Positioning plate; 42. Rotating sleeve; 421. Gear ring; 43. Threaded rod; 44. Cross slot; 45. Cross plate; 46. Synchronous plate; 47. Rotating shaft; 48. Drive wheel; 51. Top frame; 511. Rotating rod; 512. Lifting frame; 52. External sleeve ;53. Built-in plate;54. Outer arc frame;541. Control panel;55. U-shaped frame;551. Limit block;552. Lifting plate;553. Inner arc plate;56. First detection head;57. Rotating frame;58. Cleaning roller;59. Electric push rod;61. Side plate;611. Moving groove;612. Moving plate;613. Scale;62. Contact plate;63. Hydraulic rod;64. End plate;65. Pointer;66. Connecting rod;67. Limit plate;71. Circular plate;72. Radial telescopic block;73. Back plate;74. Control plate;75. Arc groove;76. Second detection head. DETAILED DESCRIPTION

[0044] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0045] Example 1: Figure 1-11 As shown, a pressure steel pipe weld detection device includes a base 1, and the upper end surface of the base 1 is provided with multiple groups of rotating units, and the middle part of the multiple groups of rotating units is provided with a placement unit fixedly connected to the base 1, and the rear side of each group of rotating units is provided with a fixing frame 4 fixed to the base 1, and two corresponding positioning plates 41 are fixedly installed on the front side of the fixing frame 4, and the positioning plate 41 is provided with a threaded rod 43 that can move along the axial direction of the positioning plate 41, and one end of one threaded rod 43 is installed with an external detection unit, and one end of the other threaded rod 43 is installed with an internal detection unit.

[0046] A rotating sleeve 42 is rotatably installed on the inner side of the positioning disk 41, and a gear ring 421 is fixedly installed on the outside of the rotating sleeve 42. The inner side of the rotating sleeve 42 is threadedly connected to the threaded rod 43. A cross slot 44 is provided on the fixed frame 4, and a cross plate 45 fixedly connected to the threaded rod 43 is slidably installed in the cross slot 44. A synchronous plate 46 is provided on the rear side of the positioning disk 41, and the synchronous plate 46 is fixedly connected to the two cross plates 45. A rotating shaft 47 rotatably connected to the fixed frame 4 is provided between the two positioning disks 41, and one end of the rotating shaft 47 is fixedly installed with a driving wheel 48 meshing with the upper and lower gear rings 421. Multiple rotating shafts 47 are provided with pulleys, and the pulleys are driven by belts. A motor is provided on the rear side of the fixed frame 4 in the middle, and the output end of the motor is connected to the rotating shaft 47 in the middle. One end of the upper threaded rod 43 is installed with an external detection unit, and one end of the lower threaded rod 43 is installed with an internal detection unit. This embodiment can realize the weld inspection of batches of steel pipes by setting the placement unit, and can clamp the ends of steel pipes of different lengths under the setting of the rotation unit, so that the steel pipe can remain stable during the weld inspection. The rotation unit can also drive the steel pipe to rotate circumferentially after fixing it, thereby meeting the uniform inspection of the circumferential weld on the outside of the steel pipe. Through the setting of the internal inspection unit and the external inspection, it can meet the requirements of synchronous inspection of the inside and outside of the steel pipe when the weld is inspected, so as to improve the accuracy of the inspection. The motor is turned on to drive the rotating shaft 47 to rotate. When the rotating shaft 47 rotates, the driving wheel 48 drives the upper and lower gear rings 421 to rotate, so that The rotating sleeve 42 rotates. When the rotating sleeve 42 rotates, since the inner wall of the rotating sleeve 42 is threadedly connected to the threaded rod 43, and the cross plate 45 and the cross slot 44 at the rear end of the threaded rod 43 slide back and forth, the upper and lower threaded rods 43 respectively drive the internal detection unit and the external detection unit to move to the weld, thereby facilitating the internal and external synchronous detection of welds at different positions of the steel pipe. Compared with the existing device, the present invention can simultaneously detect the inside and outside of the steel pipe when detecting the weld on the steel pipe, thereby improving the accuracy of the weld detection, and when detecting the weld, the steel pipe itself is rotated in a circular manner, thereby achieving uniform detection of the circumferential weld on the outside of the steel pipe.

[0047] like Figures 6 to 7As shown, the rotating unit includes two symmetrically arranged mobile frames 21, the bottom of the mobile frame 21 is slidably connected to the base 1, a turntable 22 is rotatably installed on the inner side of the upper part of the mobile frame 21, and a plurality of circumferentially arranged adjustment slots 23 are provided on the turntable 22. A driving ring 24 is rotatably installed on one side of the turntable 22, and a plurality of circumferentially arranged adjustment plates 25 are hinged on the outside of the driving ring 24. An end of the adjustment plate 25 away from the driving ring 24 is rotatably installed with a shaft 26 placed in the adjustment slot 23, and a plurality of circumferentially arranged L-shaped plates 27 are slidably installed on the side of the turntable 22 away from the driving ring 24. The plurality of L-shaped plates 27 are respectively connected to the corresponding shafts 26, and a splint 271 is installed on one side of the L-shaped plate 27. In this embodiment, the driving mechanism (such as a linear motor) is turned on to drive the two moving frames 21 to approach each other until the moving frames 21 on both sides are located at the two ends of the steel pipe. Then the driving structure (such as a rotary motor) is turned on to drive the driving ring 24 to rotate. When the driving ring 24 rotates, it drives multiple shafts 26 to slide in the adjusting groove 23 through the adjusting plate 25. At this time, the multiple L-shaped plates 27 move away from each other until the multiple L-shaped plates drive the clamping plate 271 to clamp the end of the steel pipe, thereby achieving the fixation of the steel pipe during weld detection, and after the driving structure (such as a rotary motor) is turned on, it can drive the turntable 22 to rotate in the moving frame 21, so that the steel pipe can be rotated as a whole, so as to achieve uniform inspection of the external welds of the steel pipe. Compared with the existing device, the present invention can clamp the pipe walls at both ends of the steel pipe when testing the welds of steel pipes of different lengths, and can rotate the steel pipe as a whole, so that the circumferential welds on the outer wall of the steel pipe can be uniformly ultrasonically detected.

[0048] like Figure 3As shown, the placement unit includes a rectangular frame 3, and a plurality of placement slots 31 corresponding to the rotating units are provided on the upper end surface of the rectangular frame 3. The placement slots 31 are arranged in an inverted trapezoidal shape. A plurality of lifting slots 32 corresponding to the placement slots 31 are provided in the inner cavity of the rectangular frame 3. A supporting plate 33 is slidably installed in the lifting slot 32. A front slot 34 connected to the lifting slot 32 is provided on the front side of the placement slot 31. Connecting plates 35 are slidably installed in the multiple front slots 34. The connecting plates 35 are respectively fixedly connected to the multiple supporting plates 33. A cylinder 36 is fixedly installed on one side of the rectangular frame 3, and the telescopic end of the cylinder 36 is fixedly connected to the connecting plate 35. After the steel pipe that needs to be inspected for weld seams is placed in the placement groove 31 in this embodiment, since the distance between the bottom end of the steel pipe and the bottom of the placement groove 31 is different when steel pipes of different diameters are made in the placement groove 31, the cylinder 36 is turned on to extend and retract. When the cylinder 36 extends and retracts, it drives the connecting plate 35 to rise and fall. When the connecting plate 35 rises and falls, it simultaneously drives multiple supporting plates 33 to rise and fall in the lifting groove 32. By lifting and lowering the supporting plates 33, it can be supported and placed with the bottom end of the steel pipe, thereby achieving stable support for the bottom end of the placed steel pipe when steel pipes of different diameters are placed in the placement groove 31. Compared with the existing device, the present invention can meet the requirements of stable placement of steel pipes of different specifications before inspection through the provided placement groove 31 and the supporting plates 33, thereby making the steel pipe more stable during weld seam inspection and effectively avoiding sliding of the steel pipe after being subjected to external force when it is placed.

[0049] like Figures 8 to 10As shown, the external detection unit includes a top frame 51 fixedly connected to one end of a threaded rod 43, a plurality of external sleeves 52 are fixedly installed on the lower end surface of the top frame 51, an inner plate 53 is slidably installed in the inner cavity of the outer sleeve 52, and U-shaped frames 55 are fixedly installed on both sides of the lower end surface of the inner plate 53, and the lower parts of the two U-shaped frames 55 are fixedly installed with outer arc frames 54 with a hollow structure, a limiting block 551 is installed on the bottom side of the U-shaped frame 55, and a lifting plate 552 is slidably installed between the outside of the limiting block 551 and the U-shaped frame 55, a spring is installed between the top of the lifting plate 552 and the top of the U-shaped frame 55, and an inner arc plate 553 with a hollow structure in the middle is installed between the lower ends of the lifting plates 552 on both sides. When the threaded rod 43 drives the top frame 51 to move to the top of the steel pipe weld, the motor is turned on to drive the rotating rod 511 to rotate. When the rotating rod 511 rotates, the lifting frame 512 is rotated. When the lifting frame 512 rotates, the inner plate 53 moves down in the outer sleeve 52. When the inner plate 53 moves down, the outer arc frame 54 and the U-shaped frame 55 are moved down simultaneously. When the outer arc frame 54 moves down, the inner arc plate 553 is first in contact with the steel pipe due to the setting of the spring in the U-shaped frame 55. Then the first detection head 56 is turned on to detect the weld below the inner arc plate 553. The hollow setting of the inner arc plate 553 can not affect the detection of the weld by the first detection head 56, but also facilitates the shielding of areas outside the weld. Since the first detection head 56 determines whether there are defects inside the weld by detecting the reflection of sound waves in the weld, shielding the area around the weld can effectively avoid the interference around the weld causing inaccurate detection results. Compared with the existing weld detection device, the present invention can reduce interference outside the weld by blocking the area around the weld.

[0050] The inner arc plate 553 is located on the inner side of the outer arc frame 54 and slides with it. A first detection head 56 fixed to the lower end of the inner plate 53 is provided between the two U-shaped frames 55. The first detection head 56 passes through the hollow area of ​​the outer arc frame 54 and the inner arc plate 553. A group of symmetrically arranged rotating frames 57 are provided on both sides of the outer arc frame 54. A cleaning roller 58 is installed between each group of rotating frames 57 to rotate together. An electric push rod 59 is hinged on one side of the U-shaped frame 55. The end of the electric push rod 59 away from the U-shaped frame 55 is hinged to the rotating frame 57. A control panel 541 is fixedly installed on one side of the outer arc frame 54. When the inner arc plate 553 comes into contact with the steel pipe, the electric push rod 59 is turned on and pushed forward. When the electric push rod 59 is pushed forward, the rotating frame 57 is flipped. When the rotating frame 57 flips over to the point where the cleaning roller 58 comes into contact with the weld of the steel pipe, since the weld below the inner arc plate 553 is arranged in a circumferential direction, when the steel pipe rotates, the cleaning roller 58 can clean the circumferentially rotating weld, so that the cleaned weld is successively placed under the inner arc plate 553 for inspection by the first detection head 56. Compared with the existing device, the present invention cleans the weld that is about to enter under the inner arc plate 553 by first making the weld contact with the cleaning roller 58 when rotating, thereby effectively avoiding impurities on the weld from generating additional reflected waves when the first detection head 56 performs ultrasonic inspection on the weld, thereby affecting the accuracy of the inspection result.

[0051] like Figures 1 to 8 As shown, a rotating rod 511 is installed in the middle of the top frame 51 through motor rotation, and a plurality of lifting frames 512 are fixedly installed on the rotating rod 511. The plurality of lifting frames 512 correspond one by one to the external sleeve 52 below them. A lifting groove is opened in the middle of the lifting frame 512, and the lifting groove is located outside the protruding rods on both sides of the built-in plate 53 and is sleeved on it.

[0052] Preferably, a side plate 61 is fixedly installed on one side of the outer sleeve 52, and a movable groove 611 is opened on the side of the side plate 61 close to the outer sleeve 52, and a movable plate 612 is slidably installed in the movable groove 611, and a spring is installed between the top of the movable plate 612 and the movable groove 611, and a contact plate 62 arranged in a circular arc is fixedly installed on the bottom of the movable plate 612, and a hydraulic rod 63 is fixedly installed on the top of the movable plate 612, and an end plate 64 is fixedly installed on the top of the hydraulic rod 63, and a connecting rod 66 is installed on one side of the end plate 64.

[0053] Preferably, a limit plate 67 for controlling the downward movement distance of the control plate 541 is fixedly installed on the top of the connecting rod 66, and a scale 613 is fixedly installed on one side of the side plate 61. A pointer 65 fixed to the end plate 64 is provided on the front side of the scale 613. Through the setting of the scale 613 and the pointer 65, the hydraulic rod 63 can accurately control the lifting distance of the limit plate 67, so that when the external detection unit moves downward, the limit plate 67 resists the control plate 541, so that the external detection unit can perform accurate ultrasonic detection of steel pipes of different thicknesses at different distances.

[0054] Since steel pipes of different diameters and specifications are affected by the diameter and thickness of the steel pipes during weld inspection, the distance between the top of different steel pipes and the external inspection unit is different. However, when the first inspection head 56 performs ultrasonic inspection on the welds on the steel pipes, the distance between the welds and the first inspection head 56 is also different. Therefore, when the welds on the steel pipes are inspected at a fixed distance, the contact plate 62 can be moved down to contact the outside of the steel pipe under the setting of the spring, and then the hydraulic rod 63 is turned on and lifted. When the hydraulic rod 63 is lifted, the end plate 64, the connecting rod 66, the limit plate 67 and the pointer 65 are simultaneously driven to lift. When the pointer 65 moves on the scale 613, the distance between the contact plate 62 and the limit plate 67 can be accurately observed. When the outer arc frame 54 and the first inspection head 56 move down, The control plate 541 on the outside of the outer arc frame 54 moves downward synchronously until the control plate 541 moves downward to contact the limit plate 67. At this time, the limit plate 67 resists the control plate 541. At this time, the control plate 541 and the outer arc frame 54 cannot move downward, and the distance between the first detection head 56 and the weld remains stable. By adjusting the spacing between the contact plate 62 and the limit plate 67, the distance between the first detection head 56 and the weld can be effectively controlled. After the contact plate 62 contacts the outside of the steel pipe to be inspected for welds, the present invention controls the lifting and lowering of the limit plate 67, thereby realizing fixed-distance detection between the first detection head 56 and the weld, effectively solving the problem of inaccurate detection values ​​due to the different spacing between steel pipes of different diameters and thicknesses and the external detection unit.

[0055] like Figure 11 As shown, the internal detection unit includes a circular plate 71 corresponding to the external detection unit one by one, the circular plate 71 is fixedly connected to the end of the threaded rod 43 on the lower side, and a plurality of annularly arranged radial telescopic blocks 72 are slidably installed in the radial direction on the outer periphery of the circular plate 71, and a hollow abutment plate 73 is fixedly installed on one end of the radial telescopic block 72. A regulating disk 74 is rotatably installed on one side of the circular plate 71, and a plurality of radially inclined arc grooves 75 are provided on the regulating disk 74. A cylindrical shaft fixedly connected to the inner end side of the radial telescopic block 72 is provided in the arc groove 75, and a second detection head 76 fixed to the outer end of the radial telescopic block 72 is provided on one side of the middle of the abutment plate 73.

[0056] The driving mechanism (such as a rotating motor) is turned on to drive the regulating disk 74 to rotate. When the regulating disk 74 rotates, the cylindrical shaft drives multiple radial telescopic blocks 72 to slide radially outward on the outer periphery of the circular plate 71 until the abutment plate 73 is moved to the inside of the steel pipe to abut it, and then the second detection head 76 is turned on to detect the weld inside the steel pipe. Compared with the existing device, the present invention can synchronously detect the inside and outside of the steel pipe when performing weld detection through the mutual cooperation of the internal detection unit and the external detection unit, and the setting of the abutment plate 73 can be used to resist the surrounding of the weld when ultrasonic detection is performed on the inside of the steel pipe, thereby improving the accuracy of detection.

[0057] Example 2: The present invention also discloses a detection method for the above-mentioned penstock weld detection device, comprising the following steps:

[0058] S1: Steel pipe fixing:

[0059] The steel pipe to be inspected for welds is placed in the placement unit, and then the rotating units on both sides are controlled to move closer to each other until the pipe walls on both sides of the steel pipe are clamped. The rotation of the rotating unit drives the steel pipe to rotate, so that the external inspection unit and the internal inspection unit can synchronously perform uniform and comprehensive weld inspection on the inside and outside of the steel pipe.

[0060] S2: Synchronous detection of internal and external welds of steel pipes:

[0061] The motor is turned on to drive the rotating shaft 47 to rotate. When the rotating shaft 47 rotates, the multiple rotating shafts 47 are synchronously driven to rotate simultaneously through the pulley and the belt. When the rotating shaft 47 rotates, the upper and lower gear rings 421 are driven to rotate through the driving wheel 48, so that the rotating sleeve 42 rotates inside the positioning plate 41. Since the rotating sleeve 42 is threadedly connected to the threaded rod 43, and the cross plate 45 at the rear end of the threaded rod 43 slides back and forth in the cross groove 44, when the rotating sleeve 42 rotates, the upper and lower threaded rods 43 respectively drive the external detection unit and the internal detection unit to move synchronously. At this time, the internal detection unit enters the interior of the steel pipe and cooperates with the external detection unit to synchronously detect the inside and outside of the steel pipe.

[0062] S3: Ultrasonic distance detection of the outside of the steel pipe:

[0063] After the external detection unit moves to the top of the weld of the steel pipe, the movable plate 612 drives the contact plate 62 to abut the outer wall of the steel pipe under the action of the spring. Due to the different thicknesses of different steel pipes, when the contact plate 62 abuts the outside of the steel pipe, the hydraulic rod 63 is controlled to open and the pointer 65 moves on the scale 613, thereby adjusting the distance between the limit plate 67 and the contact plate 62. After adjusting the spacing between the limit plate 67 and the contact plate 62, when the outer arc frame 54 and the control plate 541 move downward, the limit plate 67 blocks and limits the downward distance of the control plate 541, so that the first detection head 56 on the upper part of the outer arc frame 54 can perform precise distance detection on the weld on the outside of the steel pipe.

[0064] The above embodiments are merely preferred technical solutions of the present invention and should not be construed as limiting the present invention. The scope of protection of the present invention shall be the technical solutions set forth in the claims, including equivalent alternatives to the technical features of the technical solutions set forth in the claims. In other words, equivalent alternatives and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A penstock weld inspection device, comprising a base (1), wherein the upper end surface of the base (1) is provided with a plurality of rotating units, the middle of the plurality of rotating units is provided with a placement unit fixedly connected to the base (1), and the rear side of each rotating unit is provided with a fixing frame (4) fixed to the base (1), characterized in that: Two corresponding positioning plates (41) are fixedly mounted on the front side of the fixing frame (4), and a threaded rod (43) movable along the axial direction of the positioning plate (41) is provided in the positioning plate (41), wherein an external detection unit is mounted on one end of one of the threaded rods (43), and an internal detection unit is mounted on one end of the other threaded rod (43); A rotating sleeve (42) is rotatably mounted on the inner side of the positioning disk (41), a gear ring (421) is fixedly mounted on the outer side of the rotating sleeve (42), the inner side of the rotating sleeve (42) is threadedly connected to the threaded rod (43), a cross slot (44) is provided on the fixing frame (4), a cross plate (45) fixedly connected to the threaded rod (43) is slidably mounted in the cross slot (44), a synchronous plate (46) is provided on the rear side of the positioning disk (41), the synchronous plate (46) is fixedly connected to the two cross plates (45), and the two positioning disks ( 41) is provided between the fixing frame (4) and a rotating shaft (47) rotatably connected to the fixing frame (4), one end of the rotating shaft (47) is fixedly mounted with a driving wheel (48) meshing with the upper and lower gear rings (421), and multiple rotating shafts (47) are provided with pulleys, and the pulleys are driven by belts. A motor is provided on the rear side of the fixing frame (4) in the middle, and the output end of the motor is connected to the rotating shaft (47) in the middle. An external detection unit is installed at one end of the upper threaded rod (43), and an internal detection unit is installed at one end of the lower threaded rod (43); The rotating unit comprises two symmetrically arranged moving frames (21), the bottom of the moving frames (21) is slidably connected to the base (1), a turntable (22) is rotatably mounted on the inner side of the upper portion of the moving frame (21), a plurality of circumferentially arranged adjustment slots (23) are provided on the turntable (22), a driving ring (24) is rotatably mounted on one side of the turntable (22), a plurality of circumferentially arranged adjustment plates (25) are hingedly connected to the outside of the driving ring (24), a shaft (26) placed in the adjustment slot (23) is rotatably mounted on one end of the adjustment plate (25) away from the driving ring (24), a plurality of circumferentially arranged L-shaped plates (27) are slidably mounted on one side of the turntable (22) away from the driving ring (24), the plurality of L-shaped plates (27) are respectively connected to the corresponding shafts (26), and a clamping plate (271) is mounted on one side of the L-shaped plate (27).

2. A penstock weld detection device according to claim 1, characterized in that: The placement unit comprises a rectangular frame (3), wherein the upper end surface of the rectangular frame (3) is provided with a plurality of placement slots (31) corresponding to the rotation units, the placement slots (31) being arranged in an inverted trapezoidal shape, the inner cavity of the rectangular frame (3) is provided with a plurality of lifting slots (32) corresponding to the placement slots (31), a supporting plate (33) is slidably installed in the lifting slots (32), a front slot (34) communicating with the lifting slots (32) is provided on the front side of the placement slot (31), a connecting plate (35) is slidably installed in the plurality of front slots (34), the connecting plate (35) is fixedly connected to the plurality of supporting plates (33) respectively, a cylinder (36) is fixedly installed on one side of the rectangular frame (3), and the telescopic end of the cylinder (36) is fixedly connected to the connecting plate (35).

3. The penstock weld detection device according to claim 1, characterized in that: The external detection unit comprises a top frame (51) fixedly connected to one end of a threaded rod (43), a plurality of external sleeves (52) fixedly mounted on the lower end surface of the top frame (51), an internal plate (53) slidably mounted in the inner cavity of the external sleeve (52), U-shaped frames (55) fixedly mounted on both sides of the lower end surface of the internal plate (53), an outer arc frame (54) with a hollow structure fixedly mounted on the lower parts of the two U-shaped frames (55), a limit stopper (551) mounted on the bottom side of the U-shaped frame (55), a lifting plate (552) slidably mounted between the outside of the limit stopper (551) and the U-shaped frame (55), a spring mounted between the top of the lifting plate (552) and the top of the U-shaped frame (55), and an inner arc plate (553) with a hollow structure in the middle mounted between the lower ends of the lifting plates (552) on both sides.

4. A penstock weld detection device according to claim 3, characterized in that: The inner arc plate (553) is located on the inner side of the outer arc frame (54) and is slidably matched therewith. A first detection head (56) fixed to the lower end of the inner plate (53) is provided between the two U-shaped frames (55). The first detection head (56) passes through the hollow area of ​​the outer arc frame (54) and the inner arc plate (553). A group of symmetrically arranged rotating frames (57) are provided on both sides of the outer arc frame (54). A cleaning roller (58) is installed between each group of rotating frames (57) for common rotation. An electric push rod (59) is hinged on one side of the U-shaped frame (55). The end of the electric push rod (59) away from the U-shaped frame (55) is hinged to the rotating frame (57). A control panel (541) is fixedly installed on one side of the outer arc frame (54).

5. A penstock weld detection device according to claim 4, characterized in that: A rotating rod (511) is installed in the middle of the top frame (51) through the rotation of a motor, and a plurality of lifting frames (512) are fixedly installed on the rotating rod (511). The plurality of lifting frames (512) correspond one to one with the outer sleeve (52) below them. A lifting groove is opened in the middle of the lifting frame (512), and the lifting groove is located outside the protruding rods on both sides of the built-in plate (53) and is sleeved on them.

6. A penstock weld detection device according to claim 5, characterized in that: A side plate (61) is fixedly mounted on one side of the outer sleeve (52), a movable groove (611) is provided on the side of the side plate (61) close to the outer sleeve (52), a movable plate (612) is slidably mounted in the movable groove (611), a spring is installed between the top of the movable plate (612) and the movable groove (611), a contact plate (62) arranged in an arc shape is fixedly mounted on the bottom of the movable plate (612), a hydraulic rod (63) is fixedly mounted on the top of the movable plate (612), an end plate (64) is fixedly mounted on the top of the hydraulic rod (63), and a connecting rod (66) is installed on one side of the end plate (64).

7. A penstock weld detection device according to claim 6, characterized in that: A limit plate (67) for controlling the downward movement distance of the control plate (541) is fixedly installed on the top of the connecting rod (66), and a scale (613) is fixedly installed on one side of the side plate (61). A pointer (65) fixed to the end plate (64) is provided on the front side of the scale (613). By setting the scale (613) and the pointer (65), the hydraulic rod (63) can accurately control the lifting distance of the limit plate (67), so that when the external detection unit moves downward, the limit plate (67) blocks the control plate (541), so that the external detection unit can perform accurate ultrasonic detection of steel pipes of different thicknesses at different distances.

8. The penstock weld detection device according to claim 7, characterized in that: The internal detection unit includes a circular plate (71) corresponding to the external detection unit one by one, the circular plate (71) is fixedly connected to the end of the threaded rod (43) on the lower side, a plurality of radial telescopic blocks (72) arranged in an annular direction are slidably installed on the outer periphery of the circular plate (71) in the radial direction, a hollow stop plate (73) is fixedly installed on one end of the radial telescopic block (72), a regulating disk (74) is rotatably installed on one side of the circular plate (71), a plurality of radially inclined arc grooves (75) are opened on the regulating disk (74), a cylindrical shaft fixedly connected to the inner end side of the radial telescopic block (72) is provided in the arc groove (75), and a second detection head (76) fixed to the outer end of the radial telescopic block (72) is provided on one side of the middle part of the stop plate (73).

9. A detection method for the pressure steel pipe weld detection device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: Steel pipe fixing: The steel pipe to be inspected for welds is placed in the placement unit, and then the rotating units on both sides are controlled to move closer to each other until the pipe walls on both sides of the steel pipe are clamped. The rotation of the rotating unit drives the steel pipe to rotate, so that the external inspection unit and the internal inspection unit can synchronously perform uniform and comprehensive weld inspection on the inside and outside of the steel pipe. S2: Synchronous detection of internal and external welds of steel pipes: The motor is turned on to drive the rotating shaft (47) to rotate. When the rotating shaft (47) rotates, the multiple rotating shafts (47) are synchronously driven to rotate simultaneously through the pulley and the belt. When the rotating shaft (47) rotates, the upper and lower gear rings (421) are driven to rotate through the driving wheel (48), so that the rotating sleeve (42) rotates inside the positioning plate (41). Since the rotating sleeve (42) is connected to the threaded rod (43) by threaded rotation, and the cross plate (45) at the rear end of the threaded rod (43) slides back and forth in the cross groove (44), when the rotating sleeve (42) rotates, the upper and lower threaded rods (43) respectively drive the external detection unit and the internal detection unit to move synchronously. At this time, the internal detection unit enters the interior of the steel pipe and cooperates with the external detection unit to synchronously detect the inside and outside of the steel pipe; S3: Ultrasonic distance detection of the outside of the steel pipe: After the external detection unit moves to the top of the weld of the steel pipe, the movable plate (612) drives the contact plate (62) to abut against the outer wall of the steel pipe under the action of the spring. Due to the different thicknesses of different steel pipes, when the contact plate (62) abuts against the outside of the steel pipe, the hydraulic rod (63) is controlled to open so that the pointer (65) moves on the scale (613), thereby adjusting the distance between the limit plate (67) and the contact plate (62). After adjusting the distance between the limit plate (67) and the contact plate (62), when the outer arc frame (54) and the control plate (541) move downward, the limit plate (67) blocks and limits the distance of the control plate (541) moving downward, thereby allowing the first detection head (56) on the upper part of the outer arc frame (54) to accurately detect the weld outside the steel pipe.

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