An apparatus for detecting defects in an industrial pipeline and a method thereof

Abstract

The application discloses a kind of equipment and method for detecting defects of industrial pipeline, including rack, fixed in the top end one side of empty load box and installed in the surface one side of empty load box electric control box;Follow-up pipe clamp assembly, be set on empty load box, for clamping and driving large-diameter short-size industrial pipeline does circumferential rotation;Linear servo module, installation is in the other side of rack top end, and the driving end of linear servo module is installed with main support frame, the inside of main support frame is installed with sleeve joint type key shaft assembly, the inside of main support frame is installed with rotary driver at lower position, and rotary driver outputs rotary power to sleeve joint type key shaft assembly.The application forms the motion detection motion mode that pipeline continues autorotation and sensor continuous axial movement are parallel, so that the measurement track of sensor forms continuous space helix on pipeline surface, without pause or switching action can cover all to be detected area.

Description

Technical Field

[0001] This invention relates to the field of pipeline quality inspection technology, specifically to a device and method for detecting defects in industrial pipelines. Background Technology

[0002] Short-diameter, large-diameter industrial pipelines serve as rigid links between adjacent pipelines in industrial pipeline systems. In demanding scenarios such as petroleum, chemical, and power industries, they must withstand the pressure and corrosion of the internal media while also transmitting the mechanical loads generated by welding or flange connections. Their structural reliability directly determines the sealing integrity and operational safety of the entire pipeline system. Conducting wall thickness defect detection on these pipelines can identify hidden defects such as uneven wall thickness, local thinning, eccentricity, or surface pits, preventing leaks or even pipe bursts caused by stress concentration or insufficient pressure bearing capacity during service. At the same time, it ensures the uniformity of wall thickness at the pipe ends.

[0003] Currently, when implementing wall thickness defect detection, photoelectric methods are often used. This involves fixing the pipe to a fixture with rollers or V-blocks based on its nominal diameter, ensuring the axis is perpendicular to the measuring optical path. Two laser probes, mounted opposite each other, are calibrated using standard gauge blocks with known precise thicknesses. The two laser probes are located on the inside and outside of the pipe, respectively, with the two laser beams precisely focused on the same diameter line of the pipe. After preparation, the core wall thickness scanning process begins. Workers move the laser probes or the pipe body axially while simultaneously using rollers to drive the pipe to rotate circumferentially, continuously collecting wall thickness data from multiple predetermined sections. This achieves comprehensive three-dimensional coverage of the entire pipe surface. During the scanning process, workers observe the real-time wall thickness waveform or cloud map. If abnormal features such as drastic fluctuations in wall thickness, localized depressions, or overall lower thickness are detected, the specific defect type (eccentricity, pitting, or raw material deviation) is immediately identified on-site, and the defective product is physically marked and isolated.

[0004] In the above-mentioned scheme, the two laser thickness sensors on the inner and outer sides measure along the circumferential rotation path of the industrial pipeline. After each circumferential scan, the axial position of the industrial pipeline or the axial position of the two laser thickness sensors needs to be adjusted. The measurement process is intermittent and discontinuous. For large-diameter short-sized pipelines, although the length of a single pipe is limited, if a high-precision axial sampling density is required, the number of measurement sections may be as many as dozens. The accumulated pause and movement time will far exceed the actual rotation scanning time, resulting in a significant extension of the inspection cycle of a single pipeline. Summary of the Invention

[0005] The purpose of this invention is to provide an equipment and method for detecting defects in industrial pipelines. A large-diameter, short-sized pipe workpiece is lifted and fixed onto a follower-type pipe clamp assembly. The push-out assembly causes the socket-type keyshaft assembly to actuate. The actuated socket-type keyshaft assembly provides power to the follower-type pipe clamp assembly. Each end of one of three circumferentially spaced, slotted double-arm long frames is equipped with a pair of laser thickness sensors. Each pair of laser thickness sensors is located on the inner and outer sides of the pipe workpiece. A rotary driver then transmits power to the follower-type pipe clamp assembly and three axial feed assemblies through the socket-type keyshaft assembly. At this time, the pipe workpiece rotates, and the three slotted double-arm long frames move axially under the drive of their respective axial feed assemblies. This allows each pair of laser thickness sensors to detect wall thickness defects in the circumferentially rotating pipe workpiece during axial movement, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an equipment for detecting defects in industrial pipelines, comprising a frame, an empty box fixed to one side of the top of the frame, and an electrical control box installed on one side of the surface of the empty box;

[0007] The follow-type pipe clamp assembly is installed on the unloaded box and is used to clamp and drive large-diameter short-sized industrial pipes to rotate circumferentially.

[0008] A linear servo module is installed on the other side of the top of the stand, and the drive end of the linear servo module is equipped with a main support frame. The main support frame is equipped with a socket-type key shaft assembly. A rotary driver is installed at the lower part of the main support frame. The rotary driver outputs rotational power to the socket-type key shaft assembly. Three axial feed assemblies are equidistantly installed on the outer wall of the main support frame outside the socket-type key shaft assembly. A slotted double-arm long frame is installed on the drive end of the axial feed assembly. A gear multi-directional transmission assembly for power connection is installed between the axial feed assembly and the socket-type key shaft assembly.

[0009] An ejector assembly is installed on the outer wall of the main support frame on the side away from the empty box, so as to enable the socket-type key shaft assembly and the follow-type pipe clamp assembly to form a separable power connection.

[0010] Three pairs of laser thickness sensors are installed at the end of one of the slotted double-arm long frames, with one of the laser thickness sensors located inside the pipe and the other outside the pipe, for measuring the pipe wall thickness from both the inside and outside sides during the detection process.

[0011] Preferably, the ejection assembly includes a frame, a tailstock, a cylinder, and a double-layer axle bracket;

[0012] The frame is bolted to the outer wall of the main support frame away from the empty box, and the front and rear outer walls of the frame are provided with notches for the axial feed assembly. The tailstock is fixed to one outer wall of the frame, the double-layer shaft frame is slidably installed inside the tailstock, the cylinder is fixed to the outer wall of the tailstock away from the frame, and the piston rod end of the cylinder is fixed to one outer wall of the double-layer shaft frame.

[0013] Preferably, the socket-type key shaft assembly includes a turntable bearing, an internal spline shaft, and an external spline shaft;

[0014] The turntable bearing is fixed on the outer wall of the other side of the frame. The inner spline shaft is rotatably mounted on the turntable bearing. The inner spline shaft is coaxial with the input shaft of the follow-type pipe clamp assembly. The outer spline shaft is coaxially fitted in the inner spline shaft. One end of the inner spline shaft extends into the tailstock and is rotatably connected to one side of the outer wall of the double-layer shaft frame through a roller bearing.

[0015] Preferably, the rotary driver includes a servo motor installed at a lower position inside the main support frame and a belt drive pair installed on the output shaft of the servo motor. The belt drive pair is used to connect the inner spline shaft and the output shaft of the servo motor.

[0016] Preferably, one of the axial feed components includes a square guide frame fixed in the notch of the frame, a square straight arm slidably installed inside the square guide frame, and a helical rack fixedly installed parallel to the outer wall of the square straight arm facing the vertical center reference plane of the main support frame. A final stage gear shaft is rotatably installed on the outer wall of the square guide frame facing the inner spline shaft. The final stage gear shaft is connected to the inner spline shaft through a multi-directional gear transmission assembly.

[0017] Preferably, the slotted double-arm long frame includes a U-shaped long arm bolted to the outer wall of the square-mouth straight arm, two L-shaped folding arms integrally formed with straight slots at the opening of the U-shaped long arm, and a connecting seat slidably installed at the top of the L-shaped folding arm. A rocker-type set bolt is installed at the lower end of the L-shaped folding arm, and a laser thickness sensor is installed on one side of the outer wall of the connecting seat.

[0018] Preferably, the outer wall of the U-shaped long arm near the square straight arm has several T-shaped feet integrally formed at equal intervals along the length direction, and the T-shaped feet are bolted to the square straight arm.

[0019] Preferably, the multi-directional gear transmission assembly includes a bearing housing fixed on one outer wall of the square guide frame, a secondary gear shaft rotatably mounted in the bearing housing along the length of the square guide frame, and an external gear ring fixed on the outer wall of the inner spline shaft. The external gear ring meshes with the secondary gear shaft. A driving bevel gear and a reversing bevel gear are fixed on the opposite ends of the secondary gear shaft and the final gear shaft, respectively, and the driving bevel gear and the reversing bevel gear mesh with each other.

[0020] Preferably, the follow-type pipe clamp assembly includes a main shaft rotatably mounted on the outer wall of one side of the unloaded box and a hollow chuck concentrically fixed on the outer wall of the main shaft circumference. The main shaft and the external spline shaft are coaxial, and a slot and a shank are respectively provided on the opposite ends of the main shaft and the external spline shaft.

[0021] The present invention also provides a method for detecting defects in industrial pipelines, using the aforementioned equipment, comprising the following steps:

[0022] S1: The staff calibrates three pairs of laser thickness sensors. Since each pair of sensors is located on the inside and outside of the pipe workpiece and is installed at the end of the three laser thickness sensors, the staff uses standard gauge blocks corresponding to the pipe wall thickness range to place between each pair of sensors in sequence. The fixed distance between the inner and outer laser probes and the distance to the surface of the gauge blocks are recorded in the electrical control box to complete the setting of the system constant.

[0023] S2: Use lifting equipment to lift the large-diameter short-sized pipe workpiece, place it horizontally and smoothly onto the following pipe clamp assembly. The following pipe clamp assembly clamps according to the outer diameter of the pipe, firmly fixing the pipe workpiece on the clamping surface inside the assembly, ensuring that the pipe axis is basically coincident with the preset rotation axis of the equipment. After the pipe is fixed, the operator operates the push-out assembly to move forward. Under the action of the push-out assembly, the socket key shaft assembly moves towards the end of the pipe workpiece until it is connected to the power input end of the following pipe clamp assembly.

[0024] S3: After clamping and power connection are completed, the operating parameters of the rotary drive are set through the operation interface of the electrical control box to indirectly adjust the rotation speed of the workpiece and the moving speed of the three axial feed components. The detection program is started and the rotary drive starts to run. Its power is transmitted to the following pipe clamp component through the socket key shaft component, which drives the pipe workpiece to rotate continuously in the circumferential direction at the set speed. At the same time, the three axial feed components start synchronously and drive their respective corresponding slotted double-arm long frame to move in a straight line along the pipe axis. Each pair of laser thickness sensors continuously measures the wall thickness of the circumferentially rotating pipe surface during the axial movement. Since the pipe rotation and the axial movement of the sensor are carried out at the same time, the measurement trajectory of each pair of sensors forms a continuous spiral on the pipe surface. The three sets of sensors are equidistantly distributed on the circumference, and their spiral scanning trajectories are connected to each other to continuously cover the entire area of ​​the outer and inner surfaces of the pipe. During the entire detection process, the operator observes the wall thickness data waveforms transmitted by the three pairs of laser thickness sensors in real time through the display interface of the electrical control box.

[0025] S4: After the inspection is completed, a stop command is issued through the electrical control box. The rotary driver drives the workpiece to reverse, and the three axial feed components drive the corresponding slotted double-arm long frame to return to the axial zero position, so that the laser thickness sensor is completely removed from the pipe range. The push-out component reverses its action, so that the socket key shaft assembly is disengaged from the power input end of the follow-up pipe clamp assembly and returns to its original position. The follow-up pipe clamp assembly releases its clamp on the pipe, and the lifting equipment is used to lift the inspected pipe workpiece off the equipment.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: The equipment and method for detecting defects in industrial pipelines are configured with a structure in which a following pipe clamp assembly, a linear servo module, a main support frame, an ejection assembly, a socket-type key shaft assembly, a rotary driver, an axial feed assembly, a slotted double-arm long frame, and laser thickness sensors cooperate with each other. The ejection assembly causes the socket-type key shaft assembly to move, and the moved socket-type key shaft assembly provides power to the following pipe clamp assembly. Each of the three circumferentially spaced slotted double-arm long frames has a pair of laser thickness sensors at one end, with each pair of laser thickness sensors located on the inner and outer sides of the pipe workpiece. Then, the rotary driver feeds the following pipe clamp assembly and the three axial feed assemblies through the socket-type key shaft assembly. Power is transmitted, at which point the pipe workpiece rotates, and the three slotted double-arm long frames move axially under the drive of the corresponding axial feed components. This allows each pair of laser thickness sensors to detect wall thickness defects in the circumferentially rotating pipe workpiece during axial movement, thus forming a motion detection mode in parallel with the continuous rotation of the pipe and the continuous axial movement of the sensors. This makes the sensor measurement trajectory form a continuous spatial spiral on the pipe surface, covering the entire inspection area without stopping or switching actions. Moreover, the parallel operation of the three sets allows a single axial stroke to complete a full scan of the entire pipe. Compared with the traditional method of measuring each section of a single pair of sensors, the effective measurement time ratio is greatly increased, and the inspection cycle of a single pipe is significantly shortened.

[0027] Secondly, in traditional intermittent measurement, each axial step involves the repositioning and adjustment of mechanical components. In this solution, the pipe is fixed to the follower-type pipe clamp assembly and the power connection is completed through the socket-type key shaft assembly. The entire detection process is carried out in continuous motion. Two laser thickness sensors are located on the inner and outer sides of the pipe, respectively. Their relative positions are calibrated before the start of the detection and are not interrupted or disturbed by any mechanical movements during the entire axial movement. The follower-type pipe clamp assembly does not introduce additional radial runout while driving the pipe to rotate. The three axial feed assemblies synchronously drive the slotted double-arm long frame to make linear movements. All moving parts maintain a continuous and stable operating state during the detection process, and there is no position drift problem caused by repeated start and stop, thus ensuring the repeatability and accuracy of the measurement data. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ;

[0030] Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ;

[0031] Figure 4 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 3 ;

[0032] Figure 5 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 4 ;

[0033] Figure 6 This is a three-dimensional structural diagram of the empty box, the following pipe clamp assembly, and one of the axial feed assemblies of the present invention after disassembly.

[0034] Figure 7 This is a three-dimensional structural diagram of the socket-type key shaft assembly and the ejection assembly of the present invention;

[0035] Figure 8 This is a three-dimensional structural diagram of the unloaded box and the follow-up pipe clamp assembly of the present invention in the disassembled state. Figure 1 ;

[0036] Figure 9 This is a schematic diagram of the three-dimensional structure of the slotted double-arm long frame of the present invention;

[0037] Figure 10 For the present invention Figure 9 Enlarged structural diagram at point A in the middle;

[0038] Figure 11 This is a three-dimensional structural diagram of the unloaded box and the follow-up pipe clamp assembly of the present invention in the disassembled state. Figure 2 ;

[0039] Figure 12 For the present invention Figure 11 Enlarged structural diagram at point B;

[0040] Figure 13 This is a three-dimensional cross-sectional view of the follow-up pipe clamp assembly of the present invention.

[0041] In the diagram: 1. Stand; 2. Unloaded box; 3. Follow-up pipe clamp assembly; 31. Spindle; 32. Hollow chuck; 33. Slotted shank; 4. Main support frame; 5. Linear servo module; 6. Socketed key shaft assembly; 61. Turntable bearing; 62. Internal splined shaft; 63. External splined shaft; 64. Slotted shank; 7. Ejection assembly; 71. Holder frame; 72. Tailstock; 73. Cylinder; 74. Double-layer shaft support; 8. Axial feed assembly; 81. Square guide frame; 82. Square straight arm; 83. Helical rack; 84. 9. Final stage gear shaft; 10. Grooved double-arm long frame; 11. U-shaped long arm; 12. T-shaped foot; 13. L-shaped folding arm; 14. Connecting seat; 15. Handle-type set bolt; 16. Laser thickness sensor; 17. Gear multi-directional transmission assembly; 18. External gear ring; 19. Bearing seat; 10. Second stage gear shaft; 11. Drive bevel gear; 12. Reversing bevel gear; 13. Electrical control box; 14. Rotary driver; 15. Servo motor; 16. Belt drive pair. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0043] Example 1, by Figures 1 to 5 The present invention includes a stand 1, an empty box 2 fixed to one side of the top of the stand 1, and an electrical control box 12 installed on one side of the surface of the empty box 2.

[0044] The follow-type pipe clamp assembly 3 is set on the unloaded box 2 and is used to clamp and drive large-diameter short-sized industrial pipes to rotate circumferentially.

[0045] A linear servo module 5 is installed on the other side of the top of the stand 1, and a main support frame 4 is installed on the drive end of the linear servo module 5. A socket-type key shaft assembly 6 is installed inside the main support frame 4. A rotary driver 13 is installed at the lower position inside the main support frame 4. The rotary driver 13 outputs rotational power to the socket-type key shaft assembly 6. Three axial feed assemblies 8 are circumferentially installed on the outer wall of the main support frame 4 outside the socket-type key shaft assembly 6. A slotted double-arm long frame 9 is installed on the drive end of the axial feed assembly 8. A gear multi-directional transmission assembly 11 for power connection is installed between the axial feed assembly 8 and the socket-type key shaft assembly 6.

[0046] The component 7 is launched and installed on the outer wall of the main support frame 4 away from the empty box 2, so as to enable the socket key shaft assembly 6 and the follow-up tube clamp assembly 3 to form a separable power connection.

[0047] Three pairs of laser thickness sensors 10 are respectively set at the end of a slotted double-arm long frame 9, and one of the laser thickness sensors 10 is located inside the pipe and the other is located outside the pipe, which are used to measure the pipe wall thickness from the inside and outside sides respectively during the detection process.

[0048] The electrical control box 12 is responsible for receiving operation commands and simultaneously controlling the rotation speed of the rotary drive 13, the moving speed of the three axial feed components 8, and the positioning of the linear servo module 5. This ensures that the two movements of pipe rotation and sensor axial movement are strictly carried out according to the preset ratio, forming a stable and controllable spiral scanning trajectory. The electrical control box 12 also undertakes the real-time acquisition and processing of signals from three pairs of laser thickness sensors 10, converting analog signals into visualized wall thickness data for operators to monitor.

[0049] The ejection component 7 in the equipment enables the power connection between the socket key shaft assembly 6 and the follower pipe clamp assembly 3. When the ejection component 7 disconnects the power connection between the socket key shaft assembly 6 and the follower pipe clamp assembly 3, the pipe workpiece will be in a static state, and the three pairs of laser thickness sensors 10 will only perform wall thickness detection work along the axial straight path.

[0050] This embodiment provides a method for detecting defects in industrial pipelines, using the aforementioned equipment, and includes the following steps:

[0051] S1: The staff calibrates the three pairs of laser thickness sensors 10. Since each pair of sensors is located on the inside and outside of the pipe workpiece and is installed at the end of the three laser thickness sensors 10, the staff uses standard gauge blocks corresponding to the pipe wall thickness range to place between each pair of sensors in sequence. The fixed distance between the inner and outer laser probes and the distance to the surface of the gauge block are recorded in the electrical control box 12 to complete the setting of the system constant.

[0052] S2: Use lifting equipment to lift the large-diameter short-sized pipe workpiece, place it horizontally and smoothly onto the following pipe clamp assembly 3. The following pipe clamp assembly 3 clamps according to the outer diameter of the pipe, firmly fixing the pipe workpiece on the clamping surface inside the assembly, ensuring that the pipe axis is basically coincident with the preset rotation axis of the equipment. After the pipe is fixed, the operator operates the push-out assembly 7 to move forward. Under the action of the push-out assembly 7, the socket key shaft assembly 6 moves towards the end of the pipe workpiece until it is socketed with the power input end of the following pipe clamp assembly 3.

[0053] S3: After clamping and power connection are completed, the operating parameters of the rotary driver 13 are set through the operation interface of the electrical control box 12 to indirectly adjust the rotation speed of the workpiece and the moving speed of the three axial feed components 8. The detection program is started and the rotary driver 13 starts to run. Its power is transmitted to the following pipe clamp component 3 through the socket key shaft component 6, which drives the pipe workpiece to rotate continuously in the circumferential direction at the set speed. At the same time, the three axial feed components 8 are started synchronously, driving their respective corresponding slotted double-arm long frame 9 to move linearly along the pipe axis. Each pair of laser thickness sensors 10 continuously measures the wall thickness of the circumferentially rotating pipe surface during the axial movement. Since the pipe rotation and the axial movement of the sensor are carried out at the same time, the measurement trajectory of each pair of sensors forms a continuous spiral on the pipe surface. The three sets of sensors are equidistantly distributed on the circumference, and their spiral scanning trajectories are connected to each other, jointly providing continuous coverage of the entire area of ​​the outer and inner surfaces of the pipe. During the entire detection process, the operator observes the wall thickness data waveforms transmitted by the three pairs of laser thickness sensors 10 in real time through the display interface of the electrical control box 12.

[0054] S4: After the inspection is completed, a stop command is issued through the electrical control box 12. The rotary driver 13 drives the workpiece to reverse, and the three axial feed components 8 drive the corresponding slotted double-arm long frame 9 to return to the axial zero position, so that the laser thickness sensor 10 is completely removed from the pipe range. The push-out component 7 reverses its action, so that the socket key shaft component 6 is disengaged from the power input end of the following pipe clamp component 3 and returns to its original position. The following pipe clamp component 3 releases its clamp on the pipe, and the lifting equipment is used to lift the inspected pipe workpiece off the equipment.

[0055] Example 2, based on Example 1, is... Figure 6 and Figure 7 The assembly 7 is provided to include a frame 71, a tailstock 72, a cylinder 73, and a double-layer axle bracket 74.

[0056] The frame 71 is bolted to the outer wall of the main support frame 4 away from the empty box 2, and the front and rear outer walls of the frame 71 are provided with notches for the axial feed assembly 8 to be arranged. The tail frame 72 is fixed to the outer wall of the frame 71. The double-layer shaft frame 74 is slidably installed inside the tail frame 72. The cylinder 73 is fixed to the outer wall of the tail frame 72 away from the frame 71, and the piston rod end of the cylinder 73 is fixedly connected to the outer wall of the double-layer shaft frame 74.

[0057] The socket-type key shaft assembly 6 includes a turntable bearing 61, an internal spline shaft 62, and an external spline shaft 63;

[0058] The turntable bearing 61 is fixed on the outer wall of the other side of the frame 71. The inner spline shaft 62 is rotatably mounted on the turntable bearing 61. The inner spline shaft 62 is coaxial with the input shaft of the follow-type pipe clamp assembly 3. The outer spline shaft 63 is coaxially fitted in the inner spline shaft 62. One end of the inner spline shaft 62 extends into the tailstock 72 and is rotatably connected to one side of the outer wall of the double-layer shaft frame 74 through a roller bearing.

[0059] The operator starts the cylinder 73 through the electrical control box 12. Its piston rod is pushed out along the axis, that is, the double-layer shaft frame 74 moves towards the follow-up pipe clamp assembly 3, so that the socket key shaft assembly 6 moves forward and completes the engagement with the power input end of the follow-up pipe clamp assembly 3, thereby realizing the rapid connection of power transmission.

[0060] As the double-layer shaft bracket 74 is pushed out and the assembly moves toward the follower-type pipe clamp assembly 3, the external spline shaft 63, which is rotatably mounted on the outer wall of the double-layer shaft bracket 74, moves forward and gradually moves out of the inner spline shaft 62 until the external spline shaft 63 is engaged with the input end of the follower-type pipe clamp assembly 3. The connection and disconnection of power transmission are satisfied through the axially sliding transmission component.

[0061] The rotary drive 13 includes a servo motor 1301 installed at a lower position inside the main support frame 4 and a belt drive pair 1302 installed on the output shaft of the servo motor 1301. The belt drive pair 1302 is used to connect the inner spline shaft 62 and the output shaft of the servo motor 1301. The servo motor 1301 is controlled by the electrical control box 12. The output shaft of the servo motor 1301 transmits power to the inner spline shaft 62 through the belt drive pair 1302. Since the inner spline shaft 62 and the outer spline shaft 63 are meshed through splines, the inner spline shaft 62 and the outer spline shaft 63 keep rotating in the same direction, thereby outputting sufficient torque to drive the large-diameter pipe to rotate at a constant speed and the sensor to move axially.

[0062] Example 3, based on Example 2, by Figure 8 , Figure 9 , Figure 10 , Figure 11 and Figure 12 As shown, one of the axial feed components 8 includes a square guide frame 81 fixed in the notch of the frame 71, a square straight arm 82 that is slidably installed inside the square guide frame 81, and a helical rack 83 that is fixedly installed parallel to the outer wall of the square straight arm 82 facing the vertical center reference plane of the main support frame 4. A final stage gear shaft 84 is rotatably installed on the outer wall of the square guide frame 81 facing the inner spline shaft 62. The final stage gear shaft 84 is connected to the inner spline shaft 62 through the gear multi-directional transmission component 11.

[0063] The slotted double-arm long frame 9 includes a U-shaped long arm 91 that is bolted to the outer wall of the square straight arm 82, two L-shaped folding arms 92 with straight slots integrally formed at the opening of the U-shaped long arm 91, and a connecting seat 93 that is slidably installed at the top of the L-shaped folding arm 92. A rocker-type set bolt 94 is installed at the lower end of the L-shaped folding arm 92. A laser thickness sensor 10 is installed on one side of the outer wall of the connecting seat 93.

[0064] When using the slotted double-arm long frame 9 and the laser thickness sensor 10, the operator needs to adjust each pair of laser thickness sensors 10 according to the wall thickness of the pipe to be measured. Taking the adjustment of the laser thickness sensor 10 on the outside of the pipe as an example, the operator slides the connecting seat 93 along the L-shaped folding arm 92 and the length of the straight slot to adjust the distance between the laser thickness sensor 10 and the outer wall of the pipe. At this time, the standard gauge block is placed between the laser thickness sensor 10 and the outer wall of the pipe to complete the calibration. Then, the connecting seat 93 is locked on the L-shaped folding arm 92 using the rocker-handle set bolt 94.

[0065] One laser thickness sensor 10 measures the distance to the outer surface of the pipe, and the other laser thickness sensor 10 measures the distance to the inner surface of the pipe. The pipe wall thickness at the location of the sensor can be calculated by using the known fixed distance between the two laser thickness sensors 10.

[0066] Several T-shaped feet 9101 are integrally formed at equal intervals along the length direction on the outer wall of the U-shaped long arm 91 near the square straight arm 82. The T-shaped feet 9101 are bolted to the square straight arm 82. The cavity in the U-shaped long arm 91 allows two laser thickness sensors 10 to be arranged simultaneously inside and outside the pipe. The T-shaped feet 9101 are bolted to the axial feed assembly 8 and the U-shaped long arm 91 to ensure the straightness of the U-shaped long arm 91.

[0067] The multi-directional gear transmission assembly 11 includes a bearing housing 1102 fixed on one side of the outer wall of the square guide frame 81, a secondary gear shaft 1103 rotatably mounted in the bearing housing 1102 along the length of the square guide frame 81, and an external gear ring 1101 fixed on the outer wall of the inner spline shaft 62. The external gear ring 1101 meshes with the secondary gear shaft 1103. A driving bevel gear 1104 and a reversing bevel gear 1105 are respectively fixed on the opposite ends of the secondary gear shaft 1103 and the final stage gear shaft 84. 4. When the reversing bevel gear 1105 meshes, the inner spline shaft 62 is driven to rotate by the rotary driver 13. The inner spline shaft 62 will drive the outer secondary gear shafts 1103 to rotate synchronously through the outer gear ring 1101. The secondary gear shafts 1103 will then drive the reversing bevel gear 1105 to rotate through the driving bevel gear 1104. The power after reversal is transmitted to the axial feed assembly 8. The power sharing between the following tube clamp assembly 3 and the axial feed assembly 8 is realized through the sleeve key shaft assembly 6 and the gear multi-directional transmission assembly 11.

[0068] The reversing bevel gear 1105 drives the final stage gear shaft 84 to rotate, and the final stage gear shaft 84 drives the helical rack 83, the square straight arm 82, the slotted double-arm long frame 9, and the laser thickness sensor 10 to move along the axial direction of the pipeline, thereby realizing the adjustment of the axial path of pipelines of different lengths.

[0069] Example 4, based on Example 3, by Figure 13 The following is given: the follow-up pipe clamp assembly 3 includes a main shaft 31 rotatably mounted on the outer wall of one side of the empty box 2 and a hollow chuck 32 concentrically fixed on the outer wall of the circumference of the main shaft 31. The main shaft 31 and the external spline shaft 63 are coaxial, and a slot 33 and a shank 64 are respectively provided on the opposite ends of the main shaft 31 and the external spline shaft 63.

[0070] The pipe fittings are clamped by the hollow chuck 32, thereby firmly fixing the large-diameter short-size pipes on the rotation center line of the equipment.

[0071] When component 7 is pushed out, causing the external spline shaft 63 to move forward, the slot 64 at the end of the external spline shaft 63 will be inserted into the slot 33, that is, the external spline shaft 63 and the main shaft 31 are connected by power, so that the clamped pipe can rotate around the axis under the drive of the rotary driver 13.

[0072] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0073] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An equipment for detecting defects in industrial pipelines, comprising a platform (1), an empty container (2) fixed to one side of the top of the platform (1), and an electrical control box (12) mounted on one side of the surface of the empty container (2), characterized in that: The follow-up pipe clamp assembly (3) is set on the empty box (2) and is used to clamp and drive large-diameter short-sized industrial pipes to rotate circumferentially; A linear servo module (5) is installed on the other side of the top of the stand (1), and a main support frame (4) is installed on the drive end of the linear servo module (5). A socket-type key shaft assembly (6) is installed inside the main support frame (4). A rotary driver (13) is installed at the lower position inside the main support frame (4). The rotary driver (13) outputs rotational power to the socket-type key shaft assembly (6). Three axial feed assemblies (8) are equidistantly installed on the outer wall of the main support frame (4) outside the socket-type key shaft assembly (6). A slotted double-arm long frame (9) is installed on the drive end of the axial feed assembly (8). A gear multi-directional transmission assembly (11) for power connection is installed between the axial feed assembly (8) and the socket-type key shaft assembly (6). The ejection assembly (7) is installed on the outer wall of the main support frame (4) away from the empty box (2) to enable the socket key shaft assembly (6) to form a separable power connection with the follow-up tube clamp assembly (3); Three pairs of laser thickness sensors (10) are respectively set at the end of one of the slotted double-arm long frames (9), and one of the laser thickness sensors (10) is located inside the pipe and the other is located outside the pipe, which are used to measure the pipe wall thickness from the inside and outside sides respectively during the detection process.

2. The equipment for detecting defects in industrial pipelines according to claim 1, characterized in that: The ejection assembly (7) includes a frame (71), a tailstock (72), a cylinder (73), and a double-layer axle frame (74). The frame (71) is bolted to the outer wall of the main support frame (4) away from the empty box (2), and the front and rear outer walls of the frame (71) are provided with notches for the axial feed assembly (8) to be arranged. The tail frame (72) is fixed to the outer wall of the frame (71) on one side. The double-layer shaft frame (74) is slidably installed inside the tail frame (72). The cylinder (73) is fixed to the outer wall of the tail frame (72) away from the frame (71), and the piston rod end of the cylinder (73) is fixed to the outer wall of the double-layer shaft frame (74) on one side.

3. The equipment for detecting defects in industrial pipelines according to claim 2, characterized in that: The socket-type key shaft assembly (6) includes a turntable bearing (61), an internal spline shaft (62), and an external spline shaft (63). The turntable bearing (61) is fixed on the outer wall of the other side of the frame (71). The inner spline shaft (62) is rotatably mounted on the turntable bearing (61). The inner spline shaft (62) is coaxial with the input shaft of the follow-type pipe clamp assembly (3). The outer spline shaft (63) is coaxially fitted in the inner spline shaft (62). One end of the inner spline shaft (62) extends into the tailstock (72) and is rotatably connected to one side of the outer wall of the double-layer shaft frame (74) through a roller bearing.

4. The equipment for detecting defects in industrial pipelines according to claim 3, characterized in that: The rotary drive (13) includes a servo motor (1301) installed at a lower position inside the main support frame (4) and a belt drive pair (1302) installed on the output shaft of the servo motor (1301). The belt drive pair (1302) is used to connect the inner spline shaft (62) and the output shaft of the servo motor (1301).

5. The equipment for detecting defects in industrial pipelines according to claim 3, characterized in that: One of the axial feed components (8) includes a square guide frame (81) fixed in the notch of the frame (71), a square straight arm (82) that slides through and is installed inside the square guide frame (81), and a helical rack (83) that is fixedly installed parallel to the outer wall of the square straight arm (82) facing the vertical center reference plane of the main support frame (4). A final stage gear shaft (84) is rotatably installed on the outer wall of the square guide frame (81) facing the inner spline shaft (62). The final stage gear shaft (84) is connected to the inner spline shaft (62) through the gear multi-directional transmission assembly (11).

6. The equipment for detecting defects in industrial pipelines according to claim 5, characterized in that: The slotted double-arm long frame (9) includes a U-shaped long arm (91) bolted to the outer wall of a square straight arm (82), two L-shaped folding arms (92) integrally formed with straight slots at the opening of the U-shaped long arm (91), and a connecting seat (93) slidably installed at the top of the L-shaped folding arm (92). A rocker-type set bolt (94) is installed at the lower end of the L-shaped folding arm (92), and a laser thickness sensor (10) is installed on one side of the outer wall of the connecting seat (93).

7. The equipment for detecting defects in industrial pipelines according to claim 6, characterized in that: The U-shaped long arm (91) has several T-shaped feet (9101) integrally formed at equal intervals along the length direction on the outer wall of the side near the square straight arm (82), and the T-shaped feet (9101) are bolted to the square straight arm (82).

8. The equipment for detecting defects in industrial pipelines according to claim 5, characterized in that: The gear multi-directional transmission assembly (11) includes a bearing seat (1102) fixed on the outer wall of one side of the square guide frame (81), a secondary gear shaft (1103) rotatably mounted in the bearing seat (1102) along the length direction of the square guide frame (81), and an external gear ring (1101) fixed on the outer wall of the inner spline shaft (62). The external gear ring (1101) and the secondary gear shaft (1103) mesh with each other. The secondary gear shaft (1103) and the final gear shaft (84) are respectively fixed with a driving bevel gear (1104) and a reversing bevel gear (1105) at their opposite ends. The driving bevel gear (1104) and the reversing bevel gear (1105) mesh with each other.

9. The equipment for detecting defects in industrial pipelines according to claim 3, characterized in that: The following type pipe clamp assembly (3) includes a main shaft (31) rotatably mounted on the outer wall of one side of the empty box (2) and a hollow chuck (32) concentrically fixed on the outer wall of the circumference of the main shaft (31). The main shaft (31) and the external spline shaft (63) are coaxial, and a slot (33) and a shank (64) are respectively provided on the opposite ends of the main shaft (31) and the external spline shaft (63).

10. A method for detecting defects in industrial pipelines, using the equipment as described in any one of claims 1-9, characterized in that: Includes the following steps: S1: The staff calibrates the three pairs of laser thickness sensors (10). Since each pair of sensors is located on the inside and outside of the pipe workpiece and is installed at the ends of the three laser thickness sensors (10), the staff uses standard gauge blocks corresponding to the pipe wall thickness range to place between each pair of sensors in sequence. The fixed distance between the inner and outer laser probes and the distance to the surface of the gauge block are recorded in the electrical control box (12) to complete the setting of the system constant. S2: Use lifting equipment to lift the large-diameter short-sized pipe workpiece, place it horizontally and smoothly onto the follow-up pipe clamp assembly (3). The follow-up pipe clamp assembly (3) clamps according to the outer diameter of the pipe, and firmly fixes the pipe workpiece on the clamping surface inside the assembly, ensuring that the pipe axis is basically coincident with the preset rotation axis of the equipment. After the pipe is fixed, the staff operates the push-out assembly (7) to move forward. Under the action of the push-out assembly (7), the socket key shaft assembly (6) moves towards the end of the pipe workpiece until it is connected to the power input end of the follow-up pipe clamp assembly (3). S3: After clamping and power connection are completed, the operating parameters of the rotary drive (13) are set through the operation interface of the electrical control box (12) to indirectly adjust the rotation speed of the workpiece and the moving speed of the three axial feed components (8). The detection program is started, and the rotary drive (13) starts to run. Its power is transmitted to the following pipe clamp component (3) through the socket key shaft component (6), which drives the pipe workpiece to rotate continuously in the circumferential direction at the set speed. At the same time, the three axial feed components (8) start synchronously, respectively driving their corresponding slotted double-arm long frame (9) to move in the straight direction along the pipe axis. Linear motion, each pair of laser thickness sensors (10) continuously measures the wall thickness of the circumferentially rotating pipe surface during axial movement. Since the pipe rotation and the axial movement of the sensors are carried out simultaneously, the measurement trajectory of each pair of sensors forms a continuous spiral on the pipe surface. The three sets of sensors are equidistantly distributed on the circumference, and their spiral scanning trajectories are connected to each other, jointly providing continuous coverage of the entire area of ​​the outer and inner surfaces of the pipe. During the entire detection process, the staff can observe the wall thickness data waveforms transmitted back by the three pairs of laser thickness sensors (10) in real time through the display interface of the electrical control box (12). S4: After the inspection is completed, a stop command is issued through the electrical control box (12), the rotary driver (13) drives the workpiece to reverse, and the three axial feed components (8) drive the corresponding slotted double-arm long frame (9) to return to the axial zero position, so that the laser thickness sensor (10) is completely removed from the pipe range, and the push-out component (7) moves in the opposite direction, so that the socket key shaft component (6) is disengaged from the power input end of the follow-up pipe clamp component (3) and returns to its original position. The follow-up pipe clamp component (3) releases its clamp on the pipe, and the lifting equipment is used to lift the pipe workpiece that has been inspected off the equipment.

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