Automatic detection device for grid defects

Abstract

The present disclosure belongs to the field of nuclear power technology, and specifically relates to an automatic detection device for grid defects. In the automatic detection device for grid defects disclosed in the present disclosure, each camera is fixedly connected to the camera back plate, and the optical axis of each camera lens is tilted downward. The distribution relationship between the optical axes of each camera lens is adapted to the position relationship of the inner walls of the four sides of the grid unit of the grid, so that when multiple cameras approach the top of a grid unit, each camera can capture a panoramic view of the inner walls of the four sides of the grid unit, thereby realizing efficient acquisition of the image of the inner wall of the grid unit. In this way, the camera assembly can be moved to the required position through the cooperation of the X-axis module, the Z-axis module, the Y-axis module and the positioning and rotating mechanism to efficiently and conveniently capture the image of the inner wall of the grid unit, thereby reducing human errors.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power, and in particular relates to an automatic detection device for grid defects. Background Art

[0002] In the related technology, the quality of the grid needs to be inspected manually, which relies heavily on the experience of the inspectors. There is a high probability of false detection and missed detection, and the inspection efficiency is low, making it impossible to effectively control the quality of the grid products. Therefore, how to improve the efficiency and accuracy of grid quality inspection has become a problem that needs to be solved urgently. Summary of the invention

[0003] In order to overcome the problems existing in the related art, an automatic detection device for grid defects is provided.

[0004] According to one aspect of an embodiment of the present disclosure, there is provided an automatic detection device for grid defects, the automatic detection device for grid defects comprising a camera assembly, the camera assembly comprising a plurality of cameras and a camera back plate;

[0005] Each camera is fixedly connected to the camera back plate, and the optical axis of each camera lens is tilted downward. The distribution relationship between the optical axes of each camera lens is adapted to the position relationship of the inner walls of the four sides of the grid unit of the grid frame, so that when multiple cameras approach the top of a grid unit, each camera can capture a panoramic view of the inner walls of the four sides of the grid unit;

[0006] The automatic detection device for grid defects also includes: a left support, a right support, an X-axis module, a Z-axis module, a Y-axis module and a positioning and rotating mechanism;

[0007] The Y-axis module is fixedly connected to the right support, the X-axis module is connected to the driving end of the Y-axis module and is mounted between the left support and the right support, the Z-axis module is connected to the driving end of the X-axis module, and the camera assembly is connected to the driving end of the Z-axis module;

[0008] The X-axis module can drive the camera assembly to move along the horizontal X-axis direction, the Z-axis module can drive the camera assembly to move along the vertical Z-axis direction, and the Y-axis module can drive the camera assembly to move along the horizontal Y-axis direction;

[0009] The positioning and rotating mechanism is used to place the grid to be inspected.

[0010] In a possible implementation, the camera assembly further includes a plurality of rotating brackets and a plurality of single-axis slides;

[0011] Each camera is connected to the movable end of a single-axis slide via a rotating bracket, each single-axis slide is connected to the camera back plate, each rotating bracket is used to adjust the tilt angle of the connected camera, and each single-axis slide is used to adjust the up and down position of the connected camera.

[0012] In a possible implementation, the positioning and rotating mechanism includes: a turntable and a rotating motor;

[0013] The turntable is connected to the rotor of the rotary motor, and the rotary motor is used to drive the turntable to rotate.

[0014] In one possible implementation, the turntable includes: a backlight source is arranged inside the turntable, a turntable panel on the upper surface of the turntable is made of a transparent material, the turntable panel is used to place the grid to be inspected, and the backlight source can illuminate the grid on the turntable panel through the turntable panel.

[0015] In a possible implementation, a first positioning block and a second positioning block are disposed on the upper surface of the turntable, and the first positioning block and the second positioning block are L-shaped and are used to limit two diagonal corners of the grid to be inspected.

[0016] In a possible implementation, the automatic detection device for grid defects further includes a controller;

[0017] The controller drives the camera to traverse each grid unit through the X-axis module, the Z-axis module, and the Y-axis module to collect the image of the inner wall of each grid unit;

[0018] The controller performs defect recognition based on the acquired image and marks the location of the defect on the acquired image.

[0019] The beneficial effects of the present disclosure are as follows: each camera of the automatic detection device for grid defects of the present disclosure is fixedly connected to the camera back plate, the optical axis of each camera lens is tilted downward, and the distribution relationship between the optical axes of each camera lens is adapted to the position relationship of the inner walls of the four sides of the grid unit of the grid, so that when multiple cameras are close to the top of a grid unit, each camera shooting can capture a panoramic view of the inner walls of the four sides of the grid unit, thereby realizing efficient capture of the image of the inner wall of the grid unit. In this way, the camera assembly can be moved to the required position through the cooperation of the X-axis module, the Z-axis module, the Y-axis module and the positioning and rotating mechanism to efficiently and conveniently capture the image of the inner wall of the grid unit, thereby reducing human errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of an automatic detection device for grid defects according to an exemplary embodiment.

[0021] Figure 2is a schematic diagram of a camera assembly of an automatic detection device for grid defects according to an exemplary embodiment.

[0022] Figure 3 It is a schematic diagram of a positioning and rotating mechanism of an automatic detection device for grid defects according to an exemplary embodiment.

[0023] Figure 4 It is a schematic diagram of a positioning and rotating mechanism of an automatic detection device for grid defects according to an exemplary embodiment. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1 is a schematic diagram of an automatic detection device for grid defects according to an exemplary embodiment. Figure 2 is a schematic diagram of a camera assembly of an automatic detection device for grid defects according to an exemplary embodiment. Figure 3 It is a schematic diagram of a positioning and rotating mechanism of an automatic detection device for grid defects according to an exemplary embodiment. Figure 4 It is a schematic diagram of a positioning and rotating mechanism of an automatic detection device for grid defects according to an exemplary embodiment.

[0026] The guide rail assembly 2 is mainly used for carrying, flipping, moving and other actions during the grid inspection.

[0027] The height-increasing pad 3 is used for the height-increasing support of the auxiliary end sliding of the X-axis module bracket 5 .

[0028] The guide rail limit blocks 4 are fixed at both ends of the guide rail assembly 2 to prevent the module from moving beyond the range, serving as the final hard limit.

[0029] The X-axis cross module bracket 5 is made of aluminum plate, which can reduce the weight of the main body to the greatest extent while ensuring rigidity, and ensure smooth longitudinal movement with small resistance; the X-axis cross module bracket 5 is mainly used to fix the X-axis drag chain assembly 6, X-axis module 7, Z-axis drag chain assembly 8, Z-axis module 9 and its fixings.

[0030] The Z-axis module 9 is mainly used to fix the Z-axis drag chain assembly 8 and the three-camera assembly, etc.

[0031] The Y-axis module 10 is fixed on the right bracket 12, and serves as a single-axis driving robot of the Y-axis. The X-axis cross-module bracket 5 and all the upper fixings thereof are fixed on its slider, ensuring that the X-axis cross-module bracket 5 and all the upper fixings thereof move synchronously as a whole during operation.

[0032] The camera 13 and the camera lens 14 are matched and connected. There are three sets of components in the present invention, which are respectively fixed on the camera raising block 15, and then fixed as a whole on the camera back plate 16 and the single-axis slide 17, and then fixed again on the back plate support 18, the rotating bracket 1 20, and the rotating bracket 2 21, and finally fixed as a whole on the sliding bottom plate 19 to form a three-camera integral component.

[0033] The single-axis slide 17 is fixed to the back of the camera back plate 16, and each camera has one slide, which is used for fine-tuning the overall components of each camera.

[0034] The back plate support 18 is connected to the sliding bottom plate 19 to increase the height of the middle vertical camera.

[0035] The rotating bracket 1 20 and the rotating bracket 2 21 are respectively fixed on the single-axis slide 17 and the sliding bottom plate 19 for tilting the two cameras.

[0036] The diffuse reflection sensor 23 is fixed on the sensor bracket 22 and is used to detect whether there is material on the workpiece positioning table, to ensure that no collision occurs during detection and to confirm the presence of material.

[0037] The positioning platform bottom plate 24 and the positioning platform side plate 1 25, the positioning platform side plate 27, the transparent glass 28, the positioning platform side plate 3 29, and the positioning platform side plate 4 31 form a box-like structure. The backlight source 33 is fixed on the positioning platform bottom plate 24 inside the box-like structure. The transparent glass 28 is fixed on the upper part of the box-like structure. The first positioning block 26 and the second positioning block 30 are diagonally fixed on the upper part of the transparent glass 28, forming a workpiece positioning platform as a whole.

[0038] In an application example, an automatic detection device for grid defects may include an X-axis module, a Z-axis module, and a Y-axis module, which are mainly used to drive a three-camera assembly, that is, three cameras at an angle to each other. The three cameras eventually have overlapping fields of view. Each time the whole moves, a grid cross point is photographed to detect grid weld defects (insufficient welding, leaking welding, disconnection, depression), mixing wing defects (for example, deformation and damage of a single mixing wing; linearity of a row or column of mixing wings). The three groups of cameras are at an angle to each other, and the camera fields of view eventually intersect. The rotating bracket is used to adjust the position and posture of the camera (3 groups) to facilitate project debugging. The backlight source is used to assist the camera (3 groups) in detecting grid weld defects (insufficient welding, leaking welding, disconnection, depression), mixing wing defects (deformation and damage of a single mixing wing; linearity of a row or column of mixing wings); according to the needs of different types of grid detection, the camera field of view can only clearly capture the defects on one side of the grid, so it is necessary to use an external loading and unloading mechanism, such as a robot to flip the grid, and then continue to detect the other side. During normal operation, the workpiece positioning table is equipped with a diffuse reflection sensor, which is used to detect whether the grid being inspected is placed on the workpiece positioning table.

[0039] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An automatic detection device for grid defects, characterized in that: The automatic detection device for grid defects includes a camera assembly, which includes a plurality of cameras and a camera back plate; Each camera is fixedly connected to the camera back plate, and the optical axis of each camera lens is tilted downward. The distribution relationship between the optical axes of each camera lens is adapted to the position relationship of the inner walls of the four sides of the grid unit of the grid frame, so that when multiple cameras approach the top of a grid unit, each camera can capture a panoramic view of the inner walls of the four sides of the grid unit; The automatic detection device for grid defects also includes: a left support, a right support, an X-axis module, a Z-axis module, a Y-axis module and a positioning and rotating mechanism; The Y-axis module is fixedly connected to the right support, the X-axis module is connected to the driving end of the Y-axis module and is mounted between the left support and the right support, the Z-axis module is connected to the driving end of the X-axis module, and the camera assembly is connected to the driving end of the Z-axis module; The X-axis module can drive the camera assembly to move along the horizontal X-axis direction, the Z-axis module can drive the camera assembly to move along the vertical Z-axis direction, and the Y-axis module can drive the camera assembly to move along the horizontal Y-axis direction; The positioning and rotating mechanism is used to place the grid to be inspected; The camera assembly also includes a plurality of rotating brackets and a plurality of single-axis slides; Each camera is connected to the movable end of a single-axis slide via a rotating bracket, each single-axis slide is connected to the camera back plate, each rotating bracket is used to adjust the tilt angle of the connected camera, and each single-axis slide is used to adjust the up and down position of the connected camera; The positioning and rotating mechanism comprises: a turntable and a rotating motor; The turntable is connected to the rotor of the rotary motor, and the rotary motor is used to drive the turntable to rotate; The turntable comprises: a backlight source is arranged inside the turntable, a turntable panel on the upper surface of the turntable is made of a transparent material, the turntable panel is used to place a grid to be detected, and the backlight source can illuminate the grid on the turntable panel through the turntable panel; A first positioning block and a second positioning block are arranged on the upper surface of the turntable, wherein the first positioning block and the second positioning block are L-shaped and are used to limit the two diagonal corners of the grid to be inspected; The device also includes a guide rail assembly for carrying, flipping and moving during grid detection; a back plate support is connected to a sliding bottom plate for increasing the height of the middle vertical camera; and a diffuse reflection sensor is configured for the positioning and rotating mechanism to detect whether there is material on the positioning and rotating mechanism.

2. The automatic detection device for grid defects according to claim 1, characterized in that: The automatic detection device for grid defects also includes a controller; The controller drives the camera to traverse each grid unit through the X-axis module, the Z-axis module, and the Y-axis module to collect the image of the inner wall of each grid unit; The controller performs defect recognition based on the acquired image and marks the position of the defect on the acquired image.

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