A surface detection device based on machine vision

Abstract

This invention discloses a surface inspection device based on machine vision, comprising an inspection table and a positioning frame. The positioning frame is disposed on top of the inspection table and fixedly connected to it. The device further includes: a support device for supporting and fixing the workpiece to be inspected, disposed inside the positioning frame, with its side fixedly connected to the positioning frame; an inspection device for inspecting the surface of the workpiece on the support device; and a hydraulic push rod disposed on top of the inspection device, the top of which is fixedly connected to the inner wall of the positioning frame. The inspection device includes an inspection bracket, with annular tracks fixedly connected to both ends. This invention relates to the field of machine vision inspection technology. This machine vision-based surface inspection device can inspect all sides of a workpiece without flipping it during inspection, resulting in high inspection efficiency and ease of use.

Description

Technical Field

[0001] The present invention relates to the technical field of machine vision detection, in particular to a surface detection device based on machine vision. Background Art

[0002] In the process of modern industrial production, the quality requirements for the surface of industrial products are gradually increasing. Among many industrial products, surface defects such as scratches, bumps, pits, inclusions, rust spots, punching size and position will occur in the production process. At present, the commonly used defect detection methods are: eddy current detection method, infrared detection method, magnetic flux leakage detection method and machine vision detection method. Machine vision is a branch of artificial intelligence that is developing rapidly. Simply put, machine vision is to use machines instead of human eyes to make measurements and judgments. The machine vision system converts the captured target into an image signal through a machine vision product (i.e., an image capture device, divided into CMOS and CCD), transmits it to a dedicated image processing system, obtains the morphological information of the captured target, and converts it into a digital signal according to the pixel distribution, brightness, color and other information; the image system performs various operations on these signals to extract the characteristics of the target, and then controls the equipment action on site according to the results of the judgment.

[0003] Currently, machine vision can only inspect a single side of a workpiece. When other sides need to be inspected, the workpiece needs to be flipped and repositioned manually or by machine, which is cumbersome and inefficient. Summary of the invention

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a surface detection device based on machine vision, including a detection platform and a positioning frame, wherein the positioning frame is arranged on the top of the detection platform and is fixedly connected to the detection platform, and further includes:

[0005] A supporting device, which is used to support and fix the workpiece to be inspected, the supporting device is arranged inside the positioning frame, and the side of the supporting device is fixedly connected to the positioning frame;

[0006] A detection device, which is used to detect the surface of the workpiece on the supporting device, and a hydraulic push rod arranged on the top of the detection device, wherein the top of the hydraulic push rod is fixedly connected to the inner wall of the positioning frame;

[0007] The detection device includes a detection bracket, both ends of the detection bracket are fixedly connected with annular tracks, the inside of the annular track is slidably connected with a detection seat via an electronic slider, the top of the detection seat away from the annular track is fixedly connected with a detector, the top of the detection seat located on both sides of the detector is fixedly connected with a telescopic push rod, the top of the telescopic push rod is fixedly connected with a top block, and the workpiece does not need to be turned over during the detection process, and all sides of the workpiece can be detected, the detection efficiency is high, and it is easy to use.

[0008] Preferably, the top of the detection bracket is fixedly connected to the bottom of the hydraulic push rod, and a protective pad is provided on the top of the top block.

[0009] Preferably, the detection device also includes a diverter plate, a diverter air duct penetrates through and is threadedly connected to the side of the diverter plate, one end of the diverter air duct located inside the diverter plate is sleeved and rotatably connected to an extrusion collar, an arc spring is fixedly connected to the side of the extrusion collar, one end of the arc spring away from the extrusion collar is fixedly connected to the inner wall of the diverter plate, the top of the diverter plate is connected to an air inlet duct, the bottom of the diverter plate is connected to an air outlet nozzle, the end of the air inlet duct away from the diverter plate is connected to an external fan, which can prevent dust and impurities from adhering to the surface of the workpiece and affecting the detection result. At the same time, when the workpiece is lifted by the top block, the wind blown down from above can also apply a downward thrust to the workpiece, so that the workpiece can be close to the top block, thereby preventing the workpiece from deviating during movement and detection and affecting the detection.

[0010] Preferably, the diverter plate is arranged inside the detection bracket and fixedly connected to the inner wall of the detection bracket, the diverter air duct is arranged as an L-shaped tube, and the diverter air duct is arranged in multiple groups and is evenly distributed on the diverter plate.

[0011] Preferably, the supporting device includes a supporting frame, the inner wall of the supporting frame is rotatably connected to a turntable via a rotating shaft, the inner wall of the turntable is fixedly connected to an exhaust device, the side of the exhaust device is fixedly connected to a partition plate, and the side of the turntable is fixedly connected to a supporting seat. The turntable can be driven to rotate by a driving motor, and the turntable drives the supporting seat to rotate, thereby removing the workpiece at the inspection station and rotating a new workpiece to the inspection station for inspection, thereby facilitating continuous inspection and improving inspection efficiency. An air duct connected to the interior of the turntable is opened inside the supporting seat, and an end of the air duct away from the turntable is connected to a fixed suction cup.

[0012] Preferably, the support frame is arranged inside the positioning frame and fixedly connected to the positioning frame, the air duct and the fixed suction cup on the support seat are provided with multiple groups and correspond one to one, the end of the rotating shaft on one side of the turntable is fixedly connected to the driving shaft of the driving motor, and the driving motor is fixed on the support frame.

[0013] Preferably, both ends of the support seat away from the turntable are fixedly connected with arc springs, and the side of the arc spring away from the support seat is fixedly connected with a support pad. Since the arc spring is arranged in an arc-shaped sheet shape, compared with a conventional columnar spring, it is not easy to deflect to both sides after being fixed, and has better stability. It can also avoid squeezing or pulling the workpiece after deflection.

[0014] Preferably, both ends of the support seat are penetrated by and fixedly connected with a threaded sleeve, the inner wall of the threaded sleeve is threadedly connected with a threaded push rod, one end of the threaded push rod is connected to a tensioning spring, and the end of the threaded push rod away from the tensioning spring is fixedly connected with a rotating handle, which can change the position of the support pad and facilitate adaptation to workpieces of different shapes.

[0015] Preferably, one end of the tension spring away from the threaded push rod is fixedly connected to the support pad, and the threaded push rod and the tension spring are rotatably connected via a bearing member.

[0016] The present invention provides a surface detection device based on machine vision. It has the following beneficial effects:

[0017] 1. The surface detection device based on machine vision, when in use, places the workpiece on the supporting device, and then drives the detection seat to rotate through the circular track, and the detection seat drives the detector to rotate. The detector can move to different sides of the workpiece during rotation, so that each side of the workpiece can be detected by the detector. When the detector rotates to the bottom of the workpiece, the telescopic push rod extends to drive the top block to rise, and the top block pushes the upper workpiece upward, so that the workpiece is separated from the supporting device below. When the workpiece moves to a certain distance above the supporting device, the part previously blocked by the supporting device can be completely exposed to the field of view of the detector, thereby completing the detection of the bottom of the workpiece. There is no need to flip the workpiece during the detection process, and each side of the workpiece can be detected. The detection efficiency is high and it is easy to use.

[0018] 2. In the surface detection device based on machine vision, the wind generated by the external fan enters the inside of the diverter plate through the air inlet pipe, and the wind inside the diverter plate is discharged from the diverter air duct. The discharged wind blows onto the surface of the workpiece below, thereby blowing dust off the surface of the workpiece to prevent dust and impurities from adhering to the surface of the workpiece and affecting the detection results. At the same time, when the workpiece is lifted up by the top block, the wind blown down from above can also apply a downward thrust to the workpiece, so that the workpiece can be close to the top block, thereby preventing the workpiece from being offset during movement and detection and affecting the detection.

[0019] 3. The surface detection device based on machine vision can rotate the diverter duct because the diverter duct is threadedly connected to the diverter plate, thereby changing the length of the diverter duct extending to the outside of the diverter plate, which is convenient for freely adjusting the position of soot blowing and downward pressure according to the needs of the workpiece, and can also tighten the diverter duct through a tightening spring to prevent the diverter duct from shaking during the blowing process, thereby enhancing the stability of the device.

[0020] 4. The surface inspection device based on machine vision places the workpiece inside the support seat and draws air through the exhaust equipment. The internal air pressure of the space separated by the partition plate inside the turntable is reduced, so that the fixed suction cup generates suction. The workpiece is adsorbed on the support seat by the suction of the fixed suction cup, and the positioning operation is simple. After the workpiece inspection is completed, the turntable can be driven by the driving motor to rotate, and the turntable drives the support seat to rotate, so as to remove the workpiece from the inspection station and rotate the new workpiece to the inspection station for inspection, so as to facilitate continuous inspection and improve inspection efficiency.

[0021] 5. The surface detection device based on machine vision can support the workpiece adsorbed on the fixed suction cup through the setting of arc springs and protective pads, so as to avoid the situation where the workpiece shakes after being adsorbed on the fixed suction cup and affects the detection result. Since the arc spring is set as an arc sheet, it is not easy to deflect to both sides after being fixed, compared with conventional columnar springs, and has better stability. It can also avoid squeezing or pulling of the workpiece after deflection.

[0022] 6. This surface detection device based on machine vision can rotate the threaded push rod when the surface of the workpiece is uneven. The threaded push rod moves inside the threaded sleeve under the push of the thread, and drives the tensioning spring to move. The tensioning spring drives the support pad to move, thereby changing the position of the support pad, which is convenient for adapting to workpieces of different shapes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the surface detection device based on machine vision of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the detection device of the present invention;

[0025] Figure 3 It is a schematic diagram of the connection structure of the detector of the present invention;

[0026] Figure 4 This is a schematic diagram of the internal structure of the diverter plate of the present invention;

[0027] Figure 5 This is a schematic diagram of the installation structure of the support device of the present invention;

[0028] Figure 6 It is a schematic diagram of the structure of the support device of the present invention;

[0029] Figure 7 It is a schematic diagram of the internal structure of the supporting device of the present invention;

[0030] Figure 8 It is a schematic diagram of the support base structure of the present invention.

[0031] In the figure: 1. test table; 2. positioning frame; 3. supporting device; 31. supporting frame; 32. turntable; 33. exhaust equipment; 34. partition plate; 35. supporting seat; 36. air duct; 37. fixed suction cup; 38. arc spring; 39. supporting pad; 310. threaded push rod; 311. tension spring; 312. rotating handle; 313. threaded sleeve; 4. testing device; 41. testing bracket; 42. circular track; 43. testing seat; 44. detector; 45. telescopic push rod; 46. push block; 47. diverter plate; 48. diverter air duct; 49. extrusion collar; 410. tightening spring; 411. air inlet duct; 412. air outlet nozzle; 5. hydraulic push rod. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figure 1-Figure 3 The present invention provides a technical solution: a surface detection device based on machine vision, comprising a detection platform 1 and a positioning frame 2, wherein the positioning frame 2 is arranged on the top of the detection platform 1 and is fixedly connected to the detection platform 1, and further comprising:

[0034] A support device 3, which is used to support and fix the workpiece to be inspected, and the support device 3 is arranged inside the positioning frame 2, and the side surface of the support device 3 is fixedly connected to the positioning frame 2;

[0035] A detection device 4, which is used to detect the surface of the workpiece on the supporting device 3, and a hydraulic push rod 5 arranged on the top of the detection device 4, the top of the hydraulic push rod 5 is fixedly connected to the inner wall of the positioning frame 2;

[0036] The detection device 4 includes a detection bracket 41, both ends of the detection bracket 41 are fixedly connected to an annular track 42, the inside of the annular track 42 is slidably connected to a detection seat 43 through an electronic slider, the top of the detection seat 43 away from the annular track 42 is fixedly connected to a detector 44, the top of the detection seat 43 located on both sides of the detector 44 is fixedly connected to a telescopic push rod 45, the top of the telescopic push rod 45 is fixedly connected to a top block 46, the top of the detection bracket 41 is fixedly connected to the bottom of the hydraulic push rod 5, and a protective pad is provided on the top of the top block 46;

[0037] When in use, the workpiece is placed on the supporting device 3, and then the annular track 42 is used to drive the detection seat 43 to rotate, and the detection seat 43 drives the detector 44 to rotate. During the rotation of the detector 44, it can move to different sides of the workpiece, so that each side of the workpiece can be detected by the detector 44. When the detector 44 rotates to the bottom of the workpiece, the telescopic push rod 45 extends to drive the top block 46 to rise, and the top block 46 pushes the upper workpiece upward, so that the workpiece is separated from the supporting device 3 below. When the workpiece moves to a certain distance above the supporting device 3, the part previously blocked by the supporting device 3 can be completely exposed to the field of view of the detector 44, thereby completing the detection of the bottom of the workpiece. There is no need to flip the workpiece during the detection process, and each side of the workpiece can be detected. The detection efficiency is high and it is easy to use.

[0038] See also Figure 1-Figure 4 , the present invention provides a technical solution: the detection device 4 also includes a diverter plate 47, a diverter air duct 48 is penetrated through and threadedly connected to the side of the diverter plate 47, an end of the diverter air duct 48 located inside the diverter plate 47 is sleeved and rotatably connected to an extrusion collar 49, a tightening spring 410 is fixedly connected to the side of the extrusion collar 49, and the end of the tightening spring 410 away from the extrusion collar 49 is fixedly connected to the inner wall of the diverter plate 47, the top of the diverter plate 47 is connected to an air inlet pipe 411, the bottom of the diverter plate 47 is connected to an air outlet nozzle 412, and the end of the air inlet pipe 411 away from the diverter plate 47 is connected to an external fan, the diverter plate 47 is arranged inside the detection bracket 41 and fixedly connected to the inner wall of the detection bracket 41, the diverter air duct 48 is arranged as an L-shaped pipe, and a plurality of groups of diverter air ducts 48 are arranged and are evenly distributed on the diverter plate 47;

[0039] A shunt plate 47 and a shunt air duct 48 are also provided inside the detection device 4. After the wind generated by the external fan enters the shunt plate 47 through the air inlet pipe 411, the wind inside the shunt plate 47 is discharged from the shunt air duct 48. The discharged wind blows onto the surface of the workpiece below, thereby blowing dust off the surface of the workpiece, thereby preventing dust and impurities from adhering to the surface of the workpiece and affecting the detection result. At the same time, when the workpiece is lifted up by the top block 46, the wind blown down from above can also apply a downward thrust to the workpiece, so that the workpiece can be close to the top block 46, thereby preventing the workpiece from being offset during movement and detection and affecting the detection.

[0040] Since the diverter air duct 48 is threadedly connected to the diverter disk 47, the diverter air duct 48 can be rotated, so that the length of the diverter air duct 48 extending to the outside of the diverter disk 47 can be changed, which is convenient for blowing and freely adjusting the downward pressure position according to the needs of the workpiece, and the diverter air duct 48 can also be tightened by the tightening spring 410 to prevent the diverter air duct 48 from shaking during the blowing process, thereby enhancing the stability of the device.

[0041] See also Figure 1-Figure 8 The present invention provides a technical solution: the support device 3 includes a support frame 31, the inner wall of the support frame 31 is rotatably connected to a turntable 32 through a rotating shaft, the inner wall of the turntable 32 is fixedly connected to an exhaust device 33, a partition plate 34 is fixedly connected to the side of the exhaust device 33, a support seat 35 is fixedly connected to the side of the turntable 32, an air duct 36 connected to the inside of the turntable 32 is opened inside the support seat 35, and an end of the air duct 36 away from the turntable 32 is connected to a fixed suction cup 37, the support frame 31 is arranged inside the positioning frame 2 and fixedly connected to the positioning frame 2, the air duct and the fixed suction cup 37 on the support seat 35 are both provided with multiple groups and correspond one to one, the end of the rotating shaft on one side of the turntable 32 is fixedly connected to the driving shaft of the driving motor, and the driving motor is fixed on the support frame 31;

[0042] When placing a workpiece, the workpiece is placed inside the support seat 35, and air is extracted through the air extraction device 33. The internal air pressure of the space separated by the partition plate 34 inside the turntable 32 is reduced, so that the fixed suction cup 37 generates suction. The workpiece is adsorbed on the support seat 35 by the suction of the fixed suction cup 37, and the workpiece can be fixed. The positioning operation is simple. After the workpiece inspection is completed, the turntable 32 can be driven to rotate by the driving motor, and the turntable 32 drives the support seat 35 to rotate, so as to remove the workpiece at the inspection station, and rotate the new workpiece to the inspection station for inspection, so as to facilitate continuous inspection and improve the inspection efficiency.

[0043] The two ends of the support seat 35 on the side away from the rotating disk 32 are fixedly connected with an arc spring 38, and the side of the arc spring 38 away from the support seat 35 is fixedly connected with a support pad 39. Through the arrangement of the arc spring 38 and the support pad 39, the workpiece adsorbed on the fixed suction cup 37 can be supported to avoid the situation where the workpiece shakes after being adsorbed on the fixed suction cup 37 and affects the detection result. Since the arc spring is arranged in an arc sheet shape, it is not easy to deflect to both sides after being fixed, compared with a conventional columnar spring, and has better stability, and can also avoid the situation where the workpiece is squeezed or pulled after deflection;

[0044] Both ends of the support seat 35 are penetrated and fixedly connected with a threaded sleeve 313, the inner wall of the threaded sleeve 313 is threadedly connected with a threaded push rod 310, one end of the threaded push rod 310 is connected to a tensioning spring 311, the end of the threaded push rod 310 away from the tensioning spring 311 is fixedly connected to a rotating handle 312, the end of the tensioning spring 311 away from the threaded push rod 310 is fixedly connected to the support pad 39, the threaded push rod 310 and the tensioning spring 311 are rotatably connected through a bearing member. When the surface of the workpiece is uneven, the threaded push rod 310 can be rotated, and the threaded push rod 310 moves inside the threaded sleeve 313 under the push of the thread, and drives the tensioning spring 311 to move, and the tensioning spring 311 drives the support pad 39 to move, thereby changing the position of the support pad 39, which is convenient for adapting to workpieces of different shapes.

[0045] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A surface inspection device based on machine vision, comprising a detection platform (1) and a positioning frame (2), wherein the positioning frame (2) is arranged on the top of the detection platform (1) and is fixedly connected to the detection platform (1), characterized in that: Also includes: A supporting device (3), the supporting device (3) being used to support and fix a workpiece to be inspected, the supporting device (3) being arranged inside the positioning frame (2), and the side surface of the supporting device (3) being fixedly connected to the positioning frame (2); A detection device (4) for detecting the surface of a workpiece on the support device (3), and a hydraulic push rod (5) arranged on the top of the detection device (4), the top of the hydraulic push rod (5) being fixedly connected to the inner wall of the positioning frame (2); The detection device (4) comprises a detection bracket (41), both ends of the detection bracket (41) are fixedly connected to an annular track (42), the inside of the annular track (42) is slidably connected to a detection seat (43) via an electronic slider, the top of the detection seat (43) away from the annular track (42) is fixedly connected to a detector (44), the top of the detection seat (43) located on both sides of the detector (44) is fixedly connected to a telescopic push rod (45), and the top of the telescopic push rod (45) is fixedly connected to a top block (46); The support device (3) comprises a support frame (31), the inner wall of the support frame (31) being rotatably connected to a turntable (32) via a rotating shaft, the inner wall of the turntable (32) being fixedly connected to an air extraction device (33), a partition plate (34) being fixedly connected to a side of the air extraction device (33), a support seat (35) being fixedly connected to a side of the turntable (32), an air passage (36) being provided inside the support seat (35) and communicating with the inside of the turntable (32), and an end of the air passage (36) away from the turntable (32) being connected to a fixed suction cup (37).

2. A surface detection device based on machine vision according to claim 1, characterized in that: The top of the detection bracket (41) is fixedly connected to the bottom of the hydraulic push rod (5), and a protective pad is provided on the top of the top block (46).

3. The surface detection device based on machine vision according to claim 1, characterized in that: The detection device (4) further comprises a flow distribution plate (47), a flow distribution air duct (48) passing through and threadedly connected to the side of the flow distribution plate (47), one end of the flow distribution air duct (48) located inside the flow distribution plate (47) being sleeved with and rotatably connected to a pressing collar (49), a side of the pressing collar (49) being fixedly connected to a tightening spring (410), one end of the tightening spring (410) away from the pressing collar (49) being fixedly connected to the inner wall of the flow distribution plate (47), the top of the flow distribution plate (47) being connected to an air inlet duct (411), the bottom of the flow distribution plate (47) being connected to an air outlet nozzle (412), and one end of the air inlet duct (411) away from the flow distribution plate (47) being connected to an external fan.

4. The surface detection device based on machine vision according to claim 3, characterized in that: The diverter plate (47) is arranged inside the detection bracket (41) and is fixedly connected to the inner wall of the detection bracket (41); the diverter air duct (48) is arranged as an L-shaped tube; and the diverter air duct (48) is arranged in multiple groups and is evenly distributed on the diverter plate (47).

5. The surface detection device based on machine vision according to claim 1, characterized in that: The support frame (31) is arranged inside the positioning frame (2) and is fixedly connected to the positioning frame (2); the air passages and fixed suction cups (37) on the support seat (35) are provided in multiple groups and correspond one to one; the end of the rotating shaft on one side of the rotating disk (32) is fixedly connected to the driving shaft of a driving motor; and the driving motor is fixed to the support frame (31).

6. The surface detection device based on machine vision according to claim 1, characterized in that: Both ends of the support seat (35) on a side away from the rotating disk (32) are fixedly connected to arc springs (38), and the side of the arc spring (38) away from the support seat (35) is fixedly connected to a support pad (39).

7. The surface detection device based on machine vision according to claim 6, characterized in that: A threaded sleeve (313) is passed through and fixedly connected to both ends of the support seat (35); a threaded push rod (310) is threadedly connected to the inner wall of the threaded sleeve (313); one end of the threaded push rod (310) is connected to a tension spring (311); and one end of the threaded push rod (310) away from the tension spring (311) is fixedly connected to a rotating handle (312).

8. The surface detection device based on machine vision according to claim 7, characterized in that: One end of the tension spring (311) away from the threaded push rod (310) is fixedly connected to the support pad (39), and the threaded push rod (310) and the tension spring (311) are rotationally connected via a bearing member.

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