A device for detecting surface defects of metal castings

Abstract

The present invention discloses a metal casting surface defect detection device, which relates to the technical field of metal casting surface defect detection. The metal casting surface defect detection device comprises an operating table, an operating box is installed at the lower end of the operating table, and a plurality of support legs are fixed to the lower end of the operating box. During the metal casting surface defect detection operation, the present invention uses an image recognition method to complete the rapid detection of metal casting surface defects through the mutual cooperation of components such as a moving component, an adjustment component, and a control component. During the detection process, the shooting angle of the image acquisition lens is adaptively adjusted through transmission. Through the adjustment effect, the angle between the image acquisition lens and the step slope surface of the metal casting is reduced, thereby avoiding the appearance of overly bright colors or shadows when shooting the step slope surface of the metal casting, ensuring the shooting effect, and further improving the accuracy of metal casting surface defect detection.

Description

Technical Field

[0001] The present invention relates to the technical field of metal casting surface defect detection, in particular to a metal casting surface defect detection device. Background Art

[0002] Image recognition is a method for detecting surface defects in metal castings. During the detection process, an image acquisition lens is used to obtain the surface image of the metal casting. Based on image analysis technology, the image is compared with the built-in standard metal casting surface database. The surface feature differences are quantified through a specific algorithm to infer the results of the metal casting surface detection.

[0003] In the process of detecting surface defects of metal castings by image recognition method, due to the presence of steps at a certain angle on some workpieces, the image acquisition lens will produce an angle with the surface of the step position when shooting, causing some areas to have high light reflections, making the color brighter, while other areas may be in shadow, affecting the shooting effect and further reducing the accuracy of metal casting surface defect detection. For this reason, we propose a metal casting surface defect detection device. Summary of the Invention

[0004] The object of the present invention is to provide a device for detecting surface defects of metal castings to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: a metal casting surface defect detection device, comprising an operating table, an operating box mounted at the lower end of the operating table, a plurality of support legs fixed to the lower end of the operating box, an L-shaped frame fixed to the upper end of the operating table, an image acquisition lens for detecting surface defects on the inclined step of the workpiece disposed between the L-shaped frame and the operating table, and further comprising:

[0006] A limiting component is provided on the operating table for limiting the position of the workpiece to be inspected after placement; a lifting component is provided between the L-shaped frame and the image acquisition lens for raising and lowering the image acquisition lens; and a control component is provided on the image acquisition lens for adaptively controlling the angle between the image acquisition lens and the workpiece during the inspection process.

[0007] Preferably, the control component includes a lifting frame, which is located above the image acquisition lens, and a cylinder for lifting the lifting frame is provided on the L-shaped frame, and a slider is connected to the lifting frame through a sliding component, and a connecting plate is provided below the slider, and a telescopic component for assisting the telescopic connection is provided between the slider and the connecting plate, and a rotating component for assisting the rotatable connection of the image acquisition lens is provided between the connecting plate and the upper end of the image acquisition lens, and two groups of mounting blocks are symmetrically provided on both sides of the image acquisition lens, and the two groups of mounting blocks are fixed with L-shaped positioning rods for positioning during the detection process, and an adjustment component for adjusting the distance between the two groups of mounting blocks is provided on the image acquisition lens.

[0008] Preferably, the sliding assembly includes a mounting rod slidably connected to the slider, the mounting rod is fixed inside the lifting frame, and a mounting spring is sleeved on the outer side of the mounting rod.

[0009] Preferably, the telescopic assembly includes multiple groups of first sleeves fixed to the upper end of the connecting plate, the first sleeves are slidably connected to the first slide rod, one end of the first slide rod is fixed to the slider, and the outer side of each group of the first sleeves is provided with a connecting spring, and the two ends of the connecting spring are respectively connected to the slider and the connecting plate.

[0010] Preferably, the rotating assembly includes a mounting bracket fixed to the lower end of the connecting plate, the mounting bracket is rotatably connected to a connecting block via a reset assembly, and the connecting block is fixed to the upper end of the image acquisition lens.

[0011] Preferably, the adjustment component includes two groups of support frames fixed to one side of the image acquisition lens, the two groups of support frames are rotatably connected to double-headed threaded tubes, and the threads at both ends of the double-headed threaded tubes are arranged in opposite directions, and the two ends of the double-headed threaded tubes are threadedly engaged with threaded rods, one end of the two groups of threaded rods is respectively fixed to two groups of mounting blocks, and a guide component is provided between the support frame and the mounting block for guiding during the adjustment process.

[0012] Preferably, a mounting sleeve is fixed on the double-headed threaded pipe, and an anti-slip protrusion is provided on the mounting sleeve.

[0013] Preferably, the guide assembly includes two groups of second sleeves fixed on the support frame, the two groups of second sleeves are slidably connected with second sliding rods, and one end of the two groups of second sliding rods is respectively fixed to the two groups of mounting blocks.

[0014] Preferably, the reset assembly includes a reset shaft rotatably connected to the connecting block, the mounting bracket is fixed on the reset shaft, a retaining ring is fixed on the reset shaft, a torsion spring is sleeved on the outer side of the reset shaft, and both ends of the torsion spring are respectively connected to the retaining ring and the mounting bracket.

[0015] Preferably, the limiting assembly includes multiple groups of T-slots opened on the upper surface of the operating table, T-blocks are slidably connected to the T-slots, and a limiting block for limiting one side of the workpiece is fixed on the T-block. Threaded holes are opened on the limit block and the T-block, and T-bolts are threadedly connected to the threaded holes.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] During the process of detecting surface defects of metal castings, the present invention uses an image recognition method to quickly detect surface defects of metal castings through the mutual cooperation of components such as a moving component, an adjustment component, and a control component. During the detection process, the shooting angle of the image acquisition lens is adaptively adjusted through transmission. Through the adjustment effect, the angle between the image acquisition lens and the step slope surface of the metal casting is reduced, thereby avoiding excessive color or shadows when photographing the step slope surface of the metal casting, ensuring the shooting effect, and further improving the accuracy of metal casting surface defect detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the overall appearance structure of the present invention;

[0019] Figure 2 It is a schematic structural diagram of the limit assembly of the present invention;

[0020] Figure 3 This is a schematic diagram of the control component structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the structure of the regulating component of the present invention;

[0022] Figure 5 It is a schematic structural diagram of the telescopic assembly and the rotating assembly of the present invention;

[0023] Figure 6 It is a schematic structural diagram of the sliding assembly of the present invention;

[0024] Figure 7 This is a schematic diagram of the state before detection of the present invention;

[0025] Figure 8 This is a diagram showing the state in which the end of a single set of L-shaped positioning rods abuts against the inclined surface of the workpiece step during the detection process of the present invention;

[0026] Figure 9 This is a state diagram of the image acquisition lens after adaptive steering during the detection process of the present invention.

[0027] In the figure: 1. operating table; 2. operating box; 3. supporting leg; 4. L-shaped frame; 5. image acquisition lens; 601. T-slot; 602. T-block; 603. limit block; 604. threaded hole; 605. T-bolt; 701. lifting frame; 702. cylinder; 703. slider; 704. connecting plate; 705. mounting block; 706. L-shaped positioning rod; 801. mounting rod; 802. mounting spring; 901. first sleeve; 902. first slide rod; 903. connecting spring; 1001. mounting frame; 1002. connecting block; 1101. supporting frame; 1102. double-headed threaded pipe; 1103. threaded rod; 1104. mounting sleeve; 1201. second sleeve; 1202. second slide rod; 1301. reset shaft; 1302. retaining ring; 1303. torsion spring. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0029] Example 1

[0030] See also Figures 1-9 The figure shows a metal casting surface defect detection device, comprising an operating table 1, an operating box 2 mounted at the lower end of the operating table 1, a plurality of support legs 3 fixed to the lower end of the operating box 2, an L-shaped frame 4 fixed to the upper end of the operating table 1, and an image acquisition lens 5 for detecting surface defects of inclined steps on a workpiece disposed between the L-shaped frame 4 and the operating table 1;

[0031] It should be noted here that the image acquisition method surface defect detection is a common detection method, which mainly includes an image acquisition lens 5, a data processing module and a control system. The image acquisition lens 5, the data processing module and the control system are conventional technical means in the detection process. In this application, they are considered as existing technologies and will not be elaborated on here.

[0032] Also includes:

[0033] A limiting component is provided on the operating table 1 for limiting the position of the workpiece to be inspected after placement; a lifting component is provided between the L-shaped frame 4 and the image acquisition lens 5 for raising and lowering the image acquisition lens 5; and a control component is provided on the image acquisition lens 5 for adaptively controlling the angle between the image acquisition lens 5 and the workpiece during the inspection process;

[0034] The control component includes a lifting frame 701, which is located above the image acquisition lens 5. A cylinder 702 for lifting the lifting frame 701 is provided on the L-shaped frame 4. A slider 703 is connected to the lifting frame 701 through a sliding component. A connecting plate 704 is provided below the slider 703. A telescopic component for assisting the telescopic connection is provided between the slider 703 and the connecting plate 704. A rotating component for assisting the rotatable connection of the image acquisition lens 5 is provided between the connecting plate 704 and the upper end of the image acquisition lens 5. Two groups of mounting blocks 705 are symmetrically provided on both sides of the image acquisition lens 5. L-shaped positioning rods 706 for positioning during the detection process are fixed on the two groups of mounting blocks 705. An adjusting component for adjusting the distance between the two groups of mounting blocks 705 is provided on the image acquisition lens 5;

[0035] It should be noted here that: during the process of detecting surface defects of metal castings, the moving assembly, the adjustment assembly and the control assembly cooperate with each other to complete the rapid detection of surface defects of metal castings by the image recognition method, and during the detection process, the shooting angle of the image acquisition lens 5 is adaptively adjusted through transmission. Through the adjustment effect, the angle between the image acquisition lens 5 and the step slope surface of the metal casting is reduced, avoiding the appearance of overly bright colors or shadows when photographing the step slope surface of the metal casting, ensuring the shooting effect, and further improving the accuracy of metal casting surface defect detection.

[0036] Preferably, the sliding assembly includes a mounting rod 801 slidably connected to the slider 703, the mounting rod 801 is fixed inside the lifting frame 701, and a mounting spring 802 is sleeved on the outer side of the mounting rod 801;

[0037] It should be noted that the mounting rod 801 and the mounting spring 802 facilitate the sliding and resetting of the slider 703 .

[0038] Preferably, the telescopic assembly includes multiple groups of first sleeves 901 fixed to the upper end of the connecting plate 704, and the first sliding rod 902 is slidably connected to the first sleeve 901. One end of the first sliding rod 902 is fixed to the slider 703. The outer side of each group of first sleeves 901 is provided with a connecting spring 903, and the two ends of the connecting spring 903 are respectively connected to the slider 703 and the connecting plate 704;

[0039] It should be noted here that: the first sleeve 901 and the first slide rod 902 facilitate the telescopic connection between the connecting plate 704 and the slider 703, and the connecting spring 903 facilitates the reset of the connecting plate 704 and the slider 703 after the contraction movement.

[0040] Preferably, the rotating assembly includes a mounting frame 1001 fixed to the lower end of the connecting plate 704, and a connecting block 1002 is rotatably connected to the mounting frame 1001 through a reset assembly, and the connecting block 1002 is fixed to the upper end of the image acquisition lens 5;

[0041] It should be noted here that the mounting bracket 1001 , the torsion shaft and the connecting block 1002 facilitate the rotatable connection between the connecting plate 704 and the image acquisition lens 5 .

[0042] Preferably, the adjustment assembly includes two groups of support frames 1101 fixed to one side of the image acquisition lens 5, the two groups of support frames 1101 are rotatably connected to double-headed threaded tubes 1102, and the threads at both ends of the double-headed threaded tubes 1102 are arranged in opposite directions, and the two ends of the double-headed threaded tubes 1102 are threadedly engaged with threaded rods 1103, one end of the two groups of threaded rods 1103 is respectively fixed to the two groups of mounting blocks 705, and a guide assembly for guiding during the adjustment process is provided between the support frame 1101 and the mounting block 705; the guide assembly includes two groups of second sleeves 1201 fixed to the support frame 1101, the two groups of second sleeves 1201 are slidably connected to second slide bars 1202, and one end of the two groups of second slide bars 1202 is respectively fixed to the two groups of mounting blocks 705;

[0043] It should be noted here that: the double-headed threaded tube 1102 is rotated. Since the threads at both ends of the double-headed threaded tube 1102 are set in opposite directions, during the rotation of the double-headed threaded tube 1102, the two sets of threaded rods 1103 are respectively engaged with the two ends of the double-headed threaded tube 1102 and the two sets of second sliding rods 1202 are guided by the second sleeve 1201, so that the two sets of mounting blocks 705 after being subjected to force move closer to or away from each other. During the movement, the spacing between the L-shaped positioning rods 706 on the two sets of mounting blocks 705 is adjusted. By adjusting the spacing, it is convenient to perform adaptive rotation operation on the inclined surfaces of the steps on metal castings of different widths.

[0044] Preferably, a mounting sleeve 1104 is fixed on the double-ended threaded tube 1102, and an anti-slip protrusion is provided on the mounting sleeve 1104;

[0045] It should be noted here that the installation sleeve 1104 and the anti-slip protrusions on the installation sleeve 1104 facilitate the rotation operation of the double-headed threaded pipe 1102.

[0046] Preferably, the reset assembly includes a reset shaft 1301 rotatably connected to the connecting block 1002, the mounting frame 1001 is fixed to the reset shaft 1301, a retaining ring 1302 is fixed to the reset shaft 1301, a torsion spring 1303 is sleeved on the outer side of the reset shaft 1301, and both ends of the torsion spring 1303 are respectively connected to the retaining ring 1302 and the mounting frame 1001;

[0047] It should be noted here that: during the rotation process, the reset shaft 1301 is driven to rotate by the mounting bracket 1001. During the rotation of the reset shaft 1301, the retaining ring 1302 drives the torsion spring 1303 to deform under force and generate elastic force. The elastic force of the torsion spring 1303 facilitates the subsequent reset of the reset shaft 1301 and the connecting block 1002.

[0048] Preferably, the limiting assembly includes a plurality of groups of T-slots 601 provided on the upper surface of the operating table 1, a T-block 602 being slidably connected to the T-slot 601, a limiting block 603 for limiting the position of one side of the workpiece being fixed to the T-block 602, threaded holes 604 being provided on the limiting block 603 and the T-block 602, and a T-bolt 605 being threadedly connected to the threaded hole 604;

[0049] It should be noted here that: during the process of operating the surface defects of metal castings, the metal casting to be inspected is placed above the operating table 1. After placement, the T-blocks 602 on each group of T-slots 601 are pushed. During the pushing process, the limit blocks 603 on the multiple groups of T-blocks 602 are respectively abutted against the two sides of the placed metal casting. After the abutment is completed, the T-bolts 605 are rotated. During the rotation of the T-bolts 605, one end of the T-bolts 605 is abutted against the inner side of the T-slot 601. Through the abutment and extrusion effect, the limit blocks 603 on each group of T-blocks 602 are kept abutting against the two sides of the metal casting, so that the metal casting is limited and fixed above the operating table 1.

[0050] In this solution: A metal casting surface defect detection device includes the following steps:

[0051] During the process of detecting surface defects of metal castings, the metal casting to be inspected is placed on the operating table 1. After placement, the T-blocks 602 on each set of T-slots 601 are pushed. During the pushing process, the limiting blocks 603 on the multiple sets of T-blocks 602 are respectively abutted against the two sides of the placed metal casting. After the abutment is completed, the T-bolts 605 are rotated. During the rotation process, one end of the T-bolts 605 is abutted against the inner side of the T-slot 601. Through the abutting and squeezing effect, the limiting blocks 603 on each set of T-blocks 602 are kept abutting against the two sides of the metal casting, so that the metal casting is fixed above the operating table 1.

[0052] After the metal casting is limited and installed, the inclined surface of the step on the metal casting is located directly below the image acquisition lens 5. The lifting frame 701 is driven to descend by the cylinder 702. During the descent of the lifting frame 701, the image acquisition lens 5 is driven to descend by the connection between the sliding component, the telescopic component and the rotating component. After the image acquisition lens 5 is lowered, the surface of the inclined surface of the step of the metal casting clamped and fixed on the operating table 1 is photographed by the image acquisition lens 5. After the photographing is completed, the image is transmitted and compared with the built-in standard metal casting surface database based on image analysis technology. The surface feature differences are quantified by a specific algorithm, thereby inferring the results of the metal casting surface inspection;

[0053] In the process of photographing the step slope surface of the metal casting through the image acquisition lens 5, as the image acquisition lens 5 descends, the lower end of one set of L-shaped positioning rods 706 abuts against the higher position of the step slope surface of the metal casting (see FIG. Figure 8 After the offset, as the image acquisition lens 5 continues to descend, the image acquisition lens 5 is forced to rotate by the sliding connection of the slider 703, the telescopic connection between the slider 703 and the connecting plate 704, and the rotatable connection of the rotating assembly to the image acquisition lens 5. During the rotation of the image acquisition lens 5, the end of another set of L-shaped positioning rods 706 on the image acquisition lens 5 is offset against the lower position of the stepped inclined surface of the metal casting (see Figure 9 The shooting angle of the image acquisition lens 5 is adaptively adjusted. Through the adjustment, the angle between the image acquisition lens 5 and the step slope surface of the metal casting is reduced, thereby avoiding excessive color brightness or shadows when photographing the step slope surface of the metal casting, ensuring the shooting effect, and further improving the accuracy of metal casting surface defect detection.

[0054] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0055] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A metal casting surface defect detection device, comprising: An operating table (1), wherein an operating box (2) is mounted at the lower end of the operating table (1), a plurality of supporting legs (3) are fixed to the lower end of the operating box (2), an L-shaped frame (4) is fixed to the upper end of the operating table (1), and an image acquisition lens (5) for detecting surface defects of inclined steps on a workpiece is provided between the L-shaped frame (4) and the operating table (1); It is characterized by further comprising: A limiting component is provided on the operating table (1) for limiting the position of a workpiece to be inspected after placement; a lifting component is provided between the L-shaped frame (4) and the image acquisition lens (5) for lifting the image acquisition lens (5); and a control component is provided on the image acquisition lens (5) for adaptively controlling the angle between the image acquisition lens (5) and the workpiece during the inspection process; The control component comprises a lifting frame (701), the lifting frame (701) is located above the image acquisition lens (5), a cylinder (702) for lifting the lifting frame (701) is provided on the L-shaped frame (4), a slider (703) is connected to the lifting frame (701) via a sliding component, a connecting plate (704) is provided below the slider (703), a telescopic component for assisting telescopic connection is provided between the slider (703) and the connecting plate (704), a rotating component for assisting rotatable connection of the image acquisition lens (5) is provided between the connecting plate (704) and the upper end of the image acquisition lens (5), two groups of mounting blocks (705) are symmetrically provided on both sides of the image acquisition lens (5), L-shaped positioning rods (706) for positioning during detection are fixed on the two groups of mounting blocks (705), and an adjusting component for adjusting the distance between the two groups of mounting blocks (705) is provided on the image acquisition lens (5); The sliding assembly includes a mounting rod (801) slidably connected to the slider (703), the mounting rod (801) is fixed inside the lifting frame (701), and a mounting spring (802) is sleeved on the outer side of the mounting rod (801); The telescopic assembly includes a plurality of groups of first sleeves (901) fixed to the upper end of the connecting plate (704), a first slide bar (902) being slidably connected to the first sleeves (901), one end of the first slide bar (902) being fixed to the slider (703), and a connecting spring (903) being sleeved on the outer side of each group of the first sleeves (901), the two ends of the connecting spring (903) being respectively connected to the slider (703) and the connecting plate (704); The rotating assembly comprises a mounting frame (1001) fixed to the lower end of the connecting plate (704); a connecting block (1002) is rotatably connected to the mounting frame (1001) via a reset assembly; and the connecting block (1002) is fixed to the upper end of the image acquisition lens (5); The adjustment assembly comprises two groups of support frames (1101) fixed to one side of the image acquisition lens (5); a double-headed threaded tube (1102) is rotatably connected to the two groups of support frames (1101); the threads at both ends of the double-headed threaded tube (1102) are arranged in opposite directions; the two ends of the double-headed threaded tube (1102) are threadedly engaged with a threaded rod (1103); one end of the two groups of threaded rods (1103) is respectively fixed to two groups of mounting blocks (705); and a guide assembly for guiding during the adjustment process is provided between the support frames (1101) and the mounting blocks (705).

2. The metal casting surface defect detection device according to claim 1, characterized in that: A mounting sleeve (1104) is fixed on the double-headed threaded tube (1102), and an anti-slip protrusion is provided on the mounting sleeve (1104).

3. The metal casting surface defect detection device according to claim 2, characterized in that: The guide assembly includes two groups of second sleeves (1201) fixed on the support frame (1101), and the two groups of second sleeves (1201) are slidably connected to second slide bars (1202), and one end of the two groups of second slide bars (1202) is respectively fixed to the two groups of mounting blocks (705).

4. The metal casting surface defect detection device according to claim 3, characterized in that: The reset assembly comprises a reset shaft (1301) rotatably connected to the connecting block (1002); the mounting frame (1001) is fixed to the reset shaft (1301); a retaining ring (1302) is fixed to the reset shaft (1301); a torsion spring (1303) is sleeved on the outer side of the reset shaft (1301); and two ends of the torsion spring (1303) are respectively connected to the retaining ring (1302) and the mounting frame (1001).

5. The metal casting surface defect detection device according to claim 1, characterized in that: The limiting assembly comprises a plurality of groups of T-slots (601) provided on the upper surface of the operating table (1); a T-block (602) is slidably connected to the T-slots (601); a limiting block (603) for limiting the position of one side of a workpiece is fixed to the T-block (602); threaded holes (604) are provided on the limiting block (603) and the T-block (602); and a T-bolt (605) is threadedly connected to the threaded hole (604).

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