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CN-122017011-A - Welding spot detection system and detection method

CN122017011ACN 122017011 ACN122017011 ACN 122017011ACN-122017011-A

Abstract

The application relates to a welding spot detection system and a detection method, and relates to the technical field of welding spot detection, wherein the welding spot detection system comprises a traveling box; the ultrasonic probe comprises a connecting seat, a telescopic rod, an ultrasonic probe, a spring and a spring seat, wherein the connecting seat is arranged on the first side of a moving box, the telescopic rod is fixedly connected between the moving box and the connecting seat, the ultrasonic probe is arranged on the first side of the connecting seat, the spring seat is arranged on the first side of the connecting seat and is connected with the connecting seat, two ends of the spring are respectively connected with the spring seat and the ultrasonic probe, a pressure sensor is arranged in the spring seat, the pressure sensor can detect the pressure of the spring, and the control module is coupled with the telescopic rod and the pressure sensor and can control the telescopic rod to stretch according to a preset maximum pressure threshold value. The application can lead the ultrasonic probe to form comprehensive and tight fit with the target welding spot of the arc-shaped and special-shaped sheet metal part, eliminates the fit gap caused by poor suitability of the curved surface in the traditional technical scheme, and ensures the accuracy of detection data.

Inventors

  • DONG GUORUI
  • FAN RUIQIANG
  • HAO JIANG
  • YU HUAYOU

Assignees

  • 重庆蓝电汽车科技有限公司

Dates

Publication Date
20260512
Application Date
20251229

Claims (10)

  1. 1. A weld spot detection system, comprising: a traveling box (100); the connecting seat (200) is arranged on the first side of the moving box (100); The telescopic rod (300) is fixedly connected between the moving box (100) and the connecting seat (200); an ultrasonic probe (400), the ultrasonic probe (400) being disposed on a first side of the connection mount (200); A spring (500) and a spring seat (600), wherein the spring seat (600) is arranged on the first side of the connecting seat (200) and is connected with the connecting seat (200), two ends of the spring (500) are respectively connected with the spring seat (600) and the ultrasonic probe (400), a pressure sensor is arranged in the spring seat (600) and can detect the pressure of the spring (500), and The control module is coupled with the telescopic rod (300) and the pressure sensor, and can control the telescopic rod (300) to stretch and retract according to a preset maximum pressure threshold value.
  2. 2. The welding spot detection system according to claim 1, wherein a connection hole is provided on the connection seat (200), the spring seat (600) is configured as a hollow structure, and the spring seat (600) is screwed to the connection hole of the connection seat (200).
  3. 3. The welding spot detection system according to claim 2, wherein a connecting flange (310) is provided at an end of the telescopic rod (300) close to the connecting seat (200); the connecting seat (200) is arranged at intervals with the connecting flange (310) and is connected with the connecting flange through one or more bolts.
  4. 4. The weld detection system of claim 3, wherein, The ultrasonic probe (400) has a probe face, one or more liquid discharge holes (410), the liquid discharge holes (410) being provided around the probe face, and A couplant conduit (420), wherein the couplant conduit (420) is arranged through the connecting flange (310), the spring seat (600) and the spring (500); the couplant conduit (420) is coupled to the control module and communicates with the drain hole (410).
  5. 5. The weld spot detection system of claim 4, wherein the ultrasonic probe (400) further comprises a chamfer surface disposed about and inclined relative to the detection surface, the one or more drain holes (410) being spaced apart on the chamfer surface.
  6. 6. The weld spot detection system of claim 1, further comprising an image acquisition module (700), the image acquisition module (700) comprising one or more vision lenses (710), the vision lenses (710) being disposed around the ultrasound probe (400) and fixedly connected to the connection mount (200); The image acquisition module (700) is coupled with the control module.
  7. 7. The spot weld inspection system of claim 1, the welding spot detection system is characterized by further comprising: a support frame (800), wherein the support frame (800) is provided with a gun changing disc (810), and The driving mechanism (900) is arranged in the supporting frame (800) and is connected with the moving box (100), and the driving mechanism (900) can drive the moving box (100) to move.
  8. 8. The weld spot detection system of claim 7, wherein the support frame (800) comprises: a plurality of support legs (820); a first connection frame (830), the first connection frame (830) being installed between a plurality of the support legs (820) for connecting the gun changing plate (810); and a second link (840), the second link (840) being installed between the plurality of support legs (820) and being located at a first side of the first link (830) for connecting the driving mechanism (900).
  9. 9. The weld spot detection system of claim 7, wherein the drive mechanism (900) comprises: A first moving module (910), wherein the first moving module (910) is slidably connected to the second connecting frame (840) and is connected with the moving box (100) and can drive the moving box (100) to move along a first direction, and/or The second moving module (920), the second moving module (920) is slidably connected to the second connecting frame (840) and connected to the moving box (100), and can drive the moving box (100) to move along the second direction.
  10. 10. A method of spot weld detection, implemented based on the spot weld detection system of any one of claims 1-9, the method comprising: the control module establishes a coordinate system, and introduces theoretical coordinates of welding spots and corresponding appearance qualified images; Determining a target welding spot, and moving the ultrasonic probe (400) and the image acquisition module (700) to the position above the target welding spot; Acquiring a first image of the target welding spot by using the image acquisition module (700), comparing the first image with a welding spot theoretical coordinate of the target welding spot and the appearance qualified image corresponding to the welding spot theoretical coordinate, and determining a first detection result, wherein the first detection result comprises welding spot appearance quality and welding spot offset; If the appearance quality of the welding spot of the target welding spot is unqualified and/or the welding spot offset is greater than or equal to the first threshold value, detecting the next target welding spot; And if the appearance quality of the welding spot of the target welding spot is qualified and the welding spot offset is smaller than the first threshold, moving the ultrasonic probe (400) to the actual position of the target welding spot, and carrying out ultrasonic detection on the target welding spot to obtain a second detection result, wherein the second detection result comprises the welding quality of the welding spot.

Description

Welding spot detection system and detection method Technical Field The application relates to the technical field of welding spot detection, in particular to a welding spot detection system and a detection method. Background The resistance spot welding has low cost and simple debugging operation, and is one of core connection processes in the automobile production and manufacturing. In the automobile body assembly process, the automobile body mechanism of each automobile is connected and fixed through thousands of welding spots, and along with the continuous expansion of market demands of the automobile industry, higher requirements are put forward on the detection efficiency and the detection quality of the welding spots of the automobile body. At present, the detection mode of welding spots comprises two types of traditional manual detection and robot auxiliary detection, wherein the traditional manual detection needs to manually complete a series of operations such as welding spot calibration, appearance investigation, manual defect recording, probe butt welding spots and the like, and the detection flow is complex and low in efficiency. In order to improve the problem, a robot-assisted detection mode appears, the ultrasonic sensor is driven by a robot to realize lifting positioning of the ultrasonic sensor, but the scheme still has obvious application limitations that an automobile body comprises a large number of arc-shaped and irregularly-shaped sheet metal parts, welding spots of the sheet metal parts are distributed on a complex curved surface, the motion track of the robot is only adapted to a plane or a simple curved surface, the problem that joint gaps and uneven stress are easily generated between the ultrasonic sensor and the welding spots on the arc-shaped and irregularly-shaped sheet metal parts, and at the moment, not only is the manual assistance of the robot to adjust the gesture or the sensor angle, but also detection data distortion is caused due to incomplete coverage of the welding spots by a probe, and further the technical problem that repeated detection is needed and the detection efficiency still cannot be improved still appears. Disclosure of Invention The application provides a welding spot detection system and a detection method, which are used for solving the technical problems that an ultrasonic sensor is difficult to adapt to a complex curved surface sheet metal part due to the fact that a robot drives an ultrasonic sensor to lift and position, the ultrasonic sensor probe cannot cover welding spots completely, detection data is distorted, repeated detection is needed, and the detection efficiency still cannot be improved. In a first aspect, the present application provides a solder joint detection system comprising: Moving the box; The connecting seat is arranged at the first side of the moving box; The telescopic rod is fixedly connected between the moving box and the connecting seat; an ultrasonic probe arranged on the first side of the connecting seat; The ultrasonic probe comprises a connecting seat, a spring seat and a pressure sensor, wherein the spring seat is arranged on the first side of the connecting seat and is connected with the connecting seat, two ends of the spring are respectively connected with the spring seat and the ultrasonic probe, the spring seat is internally provided with the pressure sensor which can detect the pressure of the spring, and The control module is coupled with the telescopic rod and the pressure sensor, and can control the telescopic rod to stretch and retract according to a preset maximum pressure threshold value. In an alternative embodiment, the connecting seat is provided with a connecting hole, the spring seat is configured as a hollow structure, and the spring seat is in threaded connection with the connecting hole of the connecting seat. In an alternative embodiment of the present invention, In an alternative embodiment, a connecting flange is arranged at one end of the telescopic rod close to the connecting seat; The connecting seat is arranged at intervals with the connecting flange and is connected with the connecting flange through one or more bolts. In an alternative embodiment, the ultrasonic probe has a probe face and one or more drain holes provided around the probe face, and The couplant guide pipe penetrates through the connecting seat, the spring seat and the spring; the couplant conduit is coupled with the control module and is communicated with the liquid discharge hole. In an alternative embodiment, the ultrasonic probe further comprises a chamfer surface, wherein the chamfer surface is arranged around the detection surface and inclined relative to the detection surface, and one or more drain holes are arranged on the chamfer surface at intervals. In an optional embodiment, the welding spot detection system further comprises an image acquisition module, wherein the image acquisition module comprises one or more visio