Nut overturning detection device

Abstract

The invention discloses a nut overturning detection device. A rotary table is rotatably arranged around the central axis of the rotary table and is provided with a first overturning position with the front face facing upwards and a second overturning position with the back face facing upwards; an exchange channel is arranged in the rotating table, a first sinking groove is formed in the front face of the rotating table, and a second sinking groove is formed in the back face. The first sinking groove and the second sinking groove are both communicated with the exchange channel; the shifting piece can push the nut in the first sinking groove to move into the second sinking groove through the exchange channel. The blocking piece is arranged on the back side of the rotating table and is provided with a blocking position for blocking the notch of the second sinking groove; at the first overturning position, the detection end faces of the first group of first detection cameras are arranged towards the first sinking groove; and at the second overturning position, the detection end faces of the second group of first detection cameras are arranged towards the second sinking groove. The nut is shifted to translate and turn over, so that the two end faces of the nut face upwards, surface defects can be detected conveniently, the overall structure is convenient to operate, and time and labor are saved.

Description

Technical Field

[0001] This invention relates to the field of nut testing equipment technology, and in particular to a nut flipping detection device. Background Technology

[0002] Nuts, as a basic component, are widely used in various industries. In rail transportation, surface defects in nuts are critical. Their surface quality directly affects product performance. The surface of a nut involves two end faces and two side faces. Generally, typical surface defects in nuts include: Surface cracks, such as quenching cracks, are mainly caused by improper heat treatment. The stress generated during quenching is greater than the strength of the nut itself and exceeds the plastic deformation, resulting in surface cracking. Slag inclusion cracks are defects mainly caused by non-metallic slag inclusions inherent in the raw materials. Surface wrinkles are defects that mainly occur during the forging process at or near the junctions where the diameter changes, or on the top or bottom surface of the nut, due to material displacement. Surface dents are defects that are mainly caused by metal not filling the surface during the forging process, or by marks or indentations caused by cutting or shearing burrs, resulting in dents or shallow pits on the surface of the nut.

[0003] Currently, mature machine vision technology can be used to detect the aforementioned surface defects in nuts. When inspecting the end faces of a nut, one end face is placed upwards under an industrial camera. After inspection, the nut needs to be flipped so the other end face is upwards for further inspection. Therefore, a device capable of flipping the nut is needed to meet the inspection requirements of both end faces.

[0004] Similarly, when inspecting the side of a nut, the side of the nut must be facing the industrial camera, and the nut must be rotated circumferentially to inspect the circumferential side of the nut.

[0005] Furthermore, when using industrial cameras for inspection, the parallelism between the camera's inspection end and the nut is a critical parameter in machine vision inspection, directly affecting image quality and defect recognition accuracy. Specifically, the lens plane of the industrial camera (i.e., the plane perpendicular to the optical axis) must be parallel to the surface of the nut. If the parallelism is not up to standard, light reflections on the nut's surface will interfere with the image, leading to image distortion, blurred edges, and reduced accuracy in surface defect detection. Summary of the Invention

[0006] To address the aforementioned technical problems, the purpose of this invention is to propose a nut flipping detection device. By moving and flipping the nut, the two end faces of the nut can be made to face upwards, facilitating the detection of surface defects. The overall structure is convenient to operate, saves time and effort, and effectively meets the needs of nut surface defect detection.

[0007] The technical solution of the present invention is implemented as follows: a nut flipping detection device, comprising a rotary table, a toggle unit, and a detection camera; The rotary table has a central axis extending to the left and right. The rotating platform is arranged to rotate around its own central axis, and has a first flip position with the front facing up and a second flip position with the back facing up. The rotary table has an internal exchange channel that extends left and right and allows nuts to pass through. The front of the rotary table has a first recess that can accommodate nuts, and the back has a second recess that can accommodate nuts. The first and second recesses are arranged at intervals from left to right and are both connected to the exchange channel. The actuating unit is movably mounted on the rotating platform and includes an actuating component and a blocking component connected to each other. The actuating component is movably inserted into the exchange channel so as to push the nut in the first sink to move into the second sink via the exchange channel. The blocking component is located on the back side of the rotating platform and has an intercepting position that intercepts the opening of the second sink and a avoidance position that is away from the intercepting position. Two sets of the first detection cameras are arranged above the rotating platform; in the first flip position, the detection end of the first set of first detection cameras faces the first sedimentation tank; in the second flip position, the detection end of the second set of first detection cameras faces the second sedimentation tank.

[0008] Furthermore, the nut flipping detection device includes a reference base, a lifting platform, a lifting driver, and a leveling assembly; The lifting platform is movably mounted on the reference base and has a flip-up operation position and a leveling position; the lifting drive is used to drive the lifting platform to move back and forth between the flip-up operation position and the leveling position; The leveling assembly is arranged on the lifting platform with left and right intervals, and includes a bracket, a leveling block, and a first spring; the leveling block is arranged on the bracket and can move up and down and rotate about the central axis extending forward and backward; the first spring abuts between the bracket and the leveling block and has an elastic force to drive the leveling block to move downward. The first end of the rotary table in the axial direction is rotatably connected to the leveling block on the first side; the second end of the rotary table in the axial direction is movably inserted into the leveling block on the second side along the axial direction of the rotary table, and can rotate relative to the leveling block. The reference base is provided with a leveling column located below the rotary table; in the leveling position, the leveling column abuts against the back of the rotary table in the first flip position and against the front of the rotary table in the second flip position.

[0009] Furthermore, the leveling block on the second side is provided with a shaft hole; the second end of the rotary table in the axial direction is connected to the shaft hole through a central shaft.

[0010] Furthermore, the leveling block on the first side is provided with a friction surface; the rotating platform is provided with a friction mating surface; the friction surface and the friction mating surface abut against each other in the axial direction of the rotating platform.

[0011] Furthermore, the nut flipping detection device includes a nut rotating mechanism and a second detection camera; The first settling tank has a detection opening on its side wall; the second detection camera is located next to the rotary table; in the leveling position, the detection end of the second detection camera faces the detection opening. The nut rotation mechanism is mounted on a reference base and is used to drive the nut in the first groove in the first flip position to rotate around the vertically extending central axis in the leveling position.

[0012] Furthermore, the nut rotating mechanism includes a rotating rod, a rotating driver, and a clamping unit; The rotating rod is mounted on a reference base and extends vertically; the rotating driver is used to drive the rotating rod to rotate around its own central axis. The clamping unit is located at the top of the rotating rod and includes a spring and an airbag; Several of the aforementioned spring pieces are spaced apart on the rotating rod along the circumferential direction, and each has a spring end that moves radially along the rotating rod. The airbag is disposed between each elastic piece and has an air-expanded state and an air-inflated state that drives the elastic ends of each elastic piece to move to the relatively outward. In the leveling position, the clamping unit has an insertion position that is inserted into the nut from both the top and bottom; and in the insertion position, when the airbag is in an inflated state, the elastic end of the spring abuts against the inner wall of the nut.

[0013] Furthermore, the nut rotating mechanism includes an air pump; the interior of the rotating rod is provided with an air passage that communicates with the air inlet of the airbag; the rotating rod is provided with a pneumatic rotary joint that communicates with the air passage; and the air pump is connected to the pneumatic rotary joint.

[0014] Furthermore, the airbag has a ring structure; a central column is provided on the top surface of the rotating rod; the airbag is sleeved on the central column; a pressure plate is threadedly connected to the central column above the airbag; the airbag is confined between the pressure plate and the top surface of the rotating rod.

[0015] Furthermore, the second settling tank has an inlet and outlet on its side wall for the nuts to enter and exit.

[0016] Furthermore, a second spring is provided between the actuating unit and the rotary table; the second spring has an elastic force that drives the actuating unit to move away from the second sink.

[0017] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: 1. This invention utilizes a rotating body and a toggle unit. When the rotating body is in the first flip position, the first end face of the nut in the first recess faces upward, allowing for surface defect detection by the first inspection camera. The toggle unit moves the nut from the first recess into the second recess via an exchange channel, and a blocking member intercepts the nut at the opening of the second recess, preventing it from detaching. Rotating the rotating body to the second flip position turns the second end face upward, enabling surface defect detection by the first inspection camera. This combination of methods, by toggle the nut to translate and flip, allows both end faces of the nut to face upward, facilitating surface defect detection. The overall structure is convenient to operate, saves time and effort, and effectively meets the surface defect detection requirements of nuts.

[0018] 2. This invention, through the coordinated use of a leveling component, adjusts the left-right tilt angle of the rotary table relative to the reference base by moving the leveling block up and down and rotating it around the central axis extending forward and backward, as well as by moving the central axis of the rotary table within the shaft hole. The rotation of the rotary table around the central axis extending forward and backward allows for adjustment of the tilt angle relative to the reference base, thus enabling overall fine-tuning of the rotary table's spatial orientation. When the lifting platform is moved to the leveling position, the leveling column abuts against the front or back of the rotating body, automatically correcting the rotary table to a preset orientation, thereby aligning the end face of the nut on the rotary table with the detection end of the first detection camera. This method reduces light reflection interference, improves the accuracy of nut surface defect detection, and is highly practical.

[0019] 3. This invention, through the coordinated use of a nut rotation mechanism, allows the clamping unit to automatically insert into the nut within the first recess when the lifting platform moves to the leveling position. By inflating the airbag to its expanded state, the airbag drives the elastic ends of each spring to move outward and abut against the inner wall of the nut, thereby clamping and fixing the nut. By driving the rotating rod to rotate, the sides of the nut can be moved sequentially to the detection opening, allowing the second detection camera to detect surface defects on the sides of the nut. Moreover, during the above detection process, the sides of the nut can remain parallel or approximately parallel to the detection end of the second detection camera, effectively improving the accuracy of nut surface defect detection and demonstrating strong practicality. Attached Figure Description

[0020] The technical solution of the present invention will be further described below with reference to the accompanying drawings: Figure 1 This is a three-dimensional structural diagram of the overall structure of the present invention; Figure 2 for Figure 1 A sectional view of the structure; Figure 3 for Figure 1 A three-dimensional structural diagram of the lifting platform in the leveling position; Figure 4 for Figure 3 A sectional view of the structure; Figure 5 for Figure 4 Enlarged view of point A in the image; Figure 6 This is a three-dimensional structural diagram of the rotary table of the present invention with its front side facing upwards; Figure 7 for Figure 6 A sectional view of the structure; Figure 8 for Figure 6 A three-dimensional structural diagram of the nut when it is flipped; Figure 9 This is a three-dimensional structural schematic diagram of the leveling component of the present invention; Figure 10 for Figure 9 A sectional view of the structure; Figure 11 This is a three-dimensional structural schematic diagram of the rotary table of the present invention; Figure 12 for Figure 11 A sectional view of the structure; Figure 13 for Figure 11 A three-dimensional structural diagram from another perspective; Figure 14 This is a three-dimensional structural schematic diagram of the nut rotating mechanism of the present invention; Figure 15 for Figure 14 Exploded view; Figure 16 This is a three-dimensional structural schematic diagram of the reference base of the present invention; Figure 17 This is a three-dimensional structural schematic diagram of the toggle unit of the present invention; The components are as follows: 1. Base plate; 11. Leveling column; 2. Lifting platform; 21. Lifting driver; 3. Leveling assembly; 31. Bracket; 311. Guide groove; 32. Leveling block; 321. Shaft hole; 322. Friction surface; 323. Cylindrical shaft; 33. First spring; 4. Rotary table; 41. First sinker; 411. Detection opening; 42. Exchange channel; 43. Second sinker; 431. Inlet and outlet; 44. Second spring; 45. Friction mating surface; 5. Actuating unit; 51. Actuating element; 52. Blocking element; 6. Rotating rod; 61. Air passage; 62. Slot; 63. Central column; 64. Pneumatic rotary joint; 65. Rotary driver; 7. Clamping unit; 71. Spring; 72. Airbag; 73. Pressure plate; 8. Connecting base; 81. First detection camera; 82. Second detection camera. Detailed Implementation

[0021] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0022] like Figure 1-17The diagram illustrates a nut flipping detection device according to this embodiment. This device enables defect detection on both end faces and sides of a nut, and is suitable for detecting cylindrical nuts, hexagonal nuts, flange nuts, and other types of nuts. The nut flipping detection device includes a rotary table 4, a toggle unit 5, and a detection camera. The rotary table 4 has a left-right extending central axis and two opposing front and back sides on opposite sides of the central axis. The rotary table 4 can be configured to rotate around its central axis, having a first flipping position with the front side facing upwards and a second flipping position with the back side facing upwards. A left-right extending exchange channel 42 is machined inside the rotary table 4. The internal dimensions of the exchange channel 42 are adapted to the nut, allowing the nut to slide through it. A first recess 41 for accommodating the nut is machined on the front side of the rotary table 4, and a second recess 43 for accommodating the nut is machined on the back side. The shapes of the first and second recesses 41 and 43 are adapted to the nut, allowing the nut to be placed within them with a clearance fit. The first sink 41 and the second sink 43 are arranged at an interval from left to right, and both are connected to the exchange channel 42. The bottom surfaces of the first sink 41 and the second sink 43 are flush with the bottom surface of the exchange channel 42. Through this structural design, the nut can be exchanged between the first sink 41 and the second sink 43 via the exchange channel 42.

[0023] The aforementioned actuating unit 5 is movably mounted on the rotary table 4, and includes an actuating member 51 and a blocking member 52 connected to each other. A groove communicating with the exchange channel 42 is machined on the outer wall of the rotary table 4. The actuating member 51 is movably inserted into the exchange channel 42 via this groove. In the initial position, the actuating member 51 moves to the side of the first recess 41 away from the second recess 43. When the actuating unit 5 moves from the first recess 41 to the second recess 43, the actuating member 51 can push the nut in the first recess 41 to move through the exchange channel 42 into the second recess 43. The aforementioned blocking member 52 is mounted on the back side of the rotary table 4, and moves with the actuating member 51, having an intercepting position that intercepts the opening of the second recess 43 and a clearance position away from the intercepting position. When the blocking member 52 is in the intercepting position, it can intercept the nut entering the second recess 43 from the exchange channel 42, thereby preventing the nut from detaching from the opening of the second recess 43. When the blocking member 52 is in the avoidance position, it releases the obstruction of the opening of the second sink 43. Specifically, when the nut enters the second sink 43 and the blocking member 52 is in the blocking position, the rotating table 4 is driven to move from the first flipping position to the second flipping position, so that the nut in the second sink 43 can be flipped upward.

[0024] In the specific structural design, a sliding rod extending left and right is installed on the rotary table 4. An actuating element 51 is sleeved on the sliding rod to allow for left and right movement. A second spring 44 is installed between the actuating element 51 and the rotary table 4. This second spring 44, sleeved on the sliding rod, has a spring force that drives the actuating element 51 to move away from the second recess 43. Through this structural design, when the actuating element 51 pushes the nut into the second recess 43, the actuating element 51 can automatically return to its original position under the spring force of the second spring 44. By rationally designing the magnitude of the spring force of the second spring 44, the speed at which the actuating element 51 returns to its original position can be controlled.

[0025] In this embodiment, two sets of first detection cameras 81 are installed at intervals above the rotary table 4. When the rotary table 4 is in the aforementioned first flip position, the detection ends of the first set of first detection cameras 81 are arranged facing the first sink 41 to detect surface defects in the nuts in the first sink 41; when the rotary table 4 is in the aforementioned second flip position, the detection ends of the second set of first detection cameras 81 are arranged facing the second sink 43 to detect surface defects in the nuts in the second sink 43.

[0026] The nut flipping detection device of this embodiment includes a reference base 1, a lifting platform 2, a lifting driver 21, and a leveling assembly 3. The lifting platform 2 is vertically mounted on the reference base 1 to have a flipping operation position and a leveling position. The lifting driver 21 is mounted on the reference base 1 to drive the lifting platform 2 back and forth between the flipping operation position and the leveling position. The lifting driver 21 is preferably a conventional electric push rod, cylinder, hydraulic cylinder, etc. The two sets of leveling assemblies 3 are arranged laterally on the lifting platform 2, each including a bracket 31, a leveling block 32, and a first spring 33. A vertically extending guide groove 311 is machined on the bracket 31. A longitudinally extending cylindrical shaft 323 is machined on the leveling block 32. The cylindrical shaft 323 is inserted into the guide groove 311 with a clearance fit, allowing it to move within the guide groove 311. Through the engagement of the cylindrical shaft 323, the leveling block 32 can move vertically on the bracket 31 and rotate about its longitudinally extending central axis. The first spring 33 abuts between the bracket 31 and the leveling block 32, and has an elastic force that drives the leveling block 32 to move downward.

[0027] The rotary table 4 has a central shaft machined on it. The central axis of this central shaft is the central axis of the rotary table 4. The first end of the central shaft (i.e., the first axial end of the rotary table 4) is rotatably connected to the leveling block 32 on the first side via a bearing, so that the rotary table 4 can rotate around its own central axis. The leveling block 32 on the second side has a shaft hole 321 machined on it. The second end of the central shaft (i.e., the second axial end of the rotary table 4) is movably inserted into the shaft hole 321 along the axial direction of the rotary table 4, and the central shaft can rotate within the shaft hole 321, thereby enabling the rotary table 4 to rotate around its own central axis.

[0028] In the above structural design, the left and right tilt angle of the rotary table 4 relative to the reference base 1 can be adjusted by moving the leveling block 32 up and down and rotating it around the central axis extending forward and backward, and by moving the central shaft on the rotary table 4 within the shaft hole 321. By rotating the rotary table 4 around the central axis extending forward and backward, the forward and backward tilt angle of the rotary table 4 relative to the reference base 1 can be adjusted, thereby enabling overall fine-tuning of the rotary table 4's spatial orientation.

[0029] A leveling column 11 is installed on the reference base 1 below the rotary table 4. The leveling column 11 is vertically installed on the reference base 1, and there are at least two sets of them. When the lifting platform 2 moves to the aforementioned leveling position, the leveling column 11 can abut against the back of the rotary table 4 in the first flip position and against the front of the rotary table 4 in the second flip position. By abutting against the front or back of the rotary table 4 with the leveling column 11, the rotary table 4 can be forced to correct its posture, so that the front and back of the rotary table 4 can maintain a preset relative position with the first detection camera 81, thereby making the end face of the nut on the rotary table 4 parallel to the detection end of the first detection camera 81.

[0030] When the lifting platform 2 is driven to the flipping operation position, it drives the rotating platform 4 away from the leveling column 11 so that the rotating platform 4 can automatically flip.

[0031] In this embodiment, a friction disc is mounted on the leveling block 32 on the first side. This friction disc faces the rotary table 4. The friction disc can be made of plastic or rubber. A friction surface 322 facing the rotary table 4 is formed on the friction disc. A friction mating surface 45 facing the friction surface 322 is formed on the rotary table 4. When the rotary table 4 is mounted on the leveling block 32 on the first side, the friction surface 322 and the friction mating surface 45 abut against each other axially on the rotary table 4. When the rotary table 4 rotates, the friction provided by the friction surface 322 and the friction mating surface 45 enables the rotary table 4 to be held in its current position.

[0032] The nut flipping detection device of this embodiment also includes a nut rotating mechanism and a second detection camera 82. A detection opening 411 is machined on the side wall of the aforementioned first sink 41. The detection opening 411 is arranged facing the radial side of the rotary table 4.

[0033] The second inspection camera 82 is mounted beside the rotary table 4. When the lifting platform 2 moves to the leveling position, the inspection end of the second inspection camera 82 faces the inspection opening 411, and the inspection end of the second inspection camera 82 is parallel to the side wall of the nut in the first recess 41. The aforementioned nut rotation mechanism is mounted on the reference base 1 and is used to drive the nut in the first recess 41, which is in the first flip position, to rotate around the vertically extending central axis in the aforementioned leveling position. By driving the nut to rotate in the first recess 41, the sides of the nut are moved sequentially to the inspection opening 411, thereby enabling the second inspection camera 82 to inspect the surface defects of the nut's sides.

[0034] In the specific structural design, the aforementioned nut rotation mechanism includes a rotating rod 6, a rotating driver 65, a clamping unit 7, and an air pump. The rotating rod 6 is mounted on the base 1 via bearings, enabling it to rotate around its own central axis. The rotating rod 6 extends vertically. The rotating driver 65 is mounted on the base 1 and is connected to the rotating rod 6 via gear transmission to drive the rotating rod 6 to rotate around its own central axis. A through hole is machined on the bottom surface of the first sink 41. When the lifting platform 2 moves to the aforementioned leveling position, the clamping unit 7 can extend into the second sink 43 through the through hole and be inserted vertically into the nut to form an insertion position. The clamping unit 7 is mounted on the top of the rotating rod 6 and includes a spring piece 71 and an air bladder 72. A slot 62 is machined on the outer wall of the rotating rod 6. The spring piece 71 is inserted vertically into the slot 62, with its upper end forming a spring end that moves radially along the rotating rod 6. The spring piece 71 is formed by bending sheet metal. Several spring plates 71 are spaced apart on the rotating rod 6 along its circumference. An air bladder 72 is arranged between the spring plates 71, and has an air-deflated and inflated state. When the air bladder 72 is inflated, it can drive the elastic ends of each spring plate 71 to move outwards relative to each other. When the clamping unit 7 is in the aforementioned insertion position, driven by the air bladder 72, the elastic ends of the spring plates 71 abut against the inner wall of the nut, thereby clamping and fixing the nut. When the gas in the air bladder 72 is discharged and the air is deflated, the elastic ends of each spring plate 71 can move inwards relative to each other to return to their original positions. A rubber layer is installed on the outer wall of the elastic end of the spring plate 71 to enhance the stability of the contact with the nut.

[0035] The rotating rod 6 has an air passage 61 inside, communicating with the air inlet of the airbag 72. A pneumatic rotary joint 64, communicating with the air passage 61, is installed at the bottom end of the rotating rod 6. An air pump is connected to the pneumatic rotary joint 64 to inflate and deflate the airbag 72. In this embodiment, the airbag 72 has a ring-shaped structure. A central column 63 is machined on the top surface of the rotating rod 6. The airbag 72 is fitted onto the central column 63. A pressure plate 73 is threaded onto the central column 63 above the airbag 72. The airbag 72 is confined between the pressure plate 73 and the top surface of the rotating rod 6 to fix the airbag 72 to the rotating rod 6.

[0036] It should be noted that the aforementioned first detection camera 81 and second detection camera 82 are both industrial cameras in the prior art. The first detection camera 81 and the second detection camera 82 are mounted on the reference base 1 via a connecting seat 8. The detection ends of the first detection camera 81 and the second detection camera 82 are parallel to the surface of the nut, that is, the lens planes (i.e., the planes perpendicular to the optical axes) of the first detection camera 81 and the second detection camera 82 remain parallel to the surface of the nut. In this embodiment, an inlet / outlet 431 for the nut to enter and exit is machined on the side wall of the second sink 43. This inlet / outlet 431 is arranged radially towards the rotary table 4. When the rotary table 4 is in the second flip position, the nut can enter and exit the second sink 43 via this inlet / outlet 431. The aforementioned actuating unit 5 is also installed on the rotary table 4 corresponding to the second sink 43. The blocking member 52 of this actuating unit 5 is arranged on the front side of the rotary table 4, and its function is the same as that of the actuating unit 5. When the rotary table 4 is in the second flip position, the actuating unit 5 can push the nut in the second sink 43 to move into the first sink 41 via the exchange channel 42.

[0037] In practical use, the rotary table 4 is rotated to the first flip position, and the nut to be tested is placed in the first recess 41. The lifting table 2 is driven down to the leveling position so that the leveling column 11 abuts against the back of the rotary table 4. The first set of first inspection cameras 81 acquires an image of the first end face of the nut for surface defect detection. At the same time, the clamping unit 7 is inserted into the nut inside the first recess 41, and the airbag 72 is inflated to its inflated state. The airbag 72 drives the elastic ends of each spring 71 to move outward and abut against the inner wall of the nut to clamp and fix the nut. The rotating rod 6 is driven to rotate so that each side of the nut moves sequentially to the inspection opening 411, and the second inspection camera 82 acquires images of each side of the nut for surface defect detection. After the above inspection is completed, the lifting platform 2 is driven upward to the flipping operation position, pushing the actuating component 51 towards the second sink 43 to push the nut in the first sink 41 into the second sink 43 through the exchange channel 42. At the same time, the blocking component 52 intercepts the opening of the second sink 43 to prevent the nut from falling out. The rotating body is then rotated to the second flipping position, so that the nut in the second sink 43 faces upward, allowing the first inspection camera 81 to perform surface defect inspection. The lifting platform 2 is then driven downward to the leveling position, so that the leveling column 11 abuts against the front of the rotating platform 4, and the second set of first inspection cameras 81 acquires an image of the second end face of the nut. After the inspection is completed, the nut is pushed out through the inlet / outlet 431 on the second sink 43. In the above method, by moving and flipping the nut, the two end faces of the nut can be made to face upwards respectively, so as to facilitate the detection of surface defects. The rotary table 4 can be automatically corrected to a preset posture, so that the end face of the nut on the rotary table 4 is parallel to the detection end of the first detection camera 81, and the side of the nut is kept parallel or approximately parallel to the detection end of the second detection camera 82. This can reduce light reflection interference and improve the accuracy of nut surface defect detection.

[0038] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A nut flipping detection device, comprising a rotary table, a turning unit, and a detection camera; characterized in that: The rotary table has a central axis extending to the left and right. The rotating platform is arranged to rotate around its own central axis, and has a first flip position with the front facing up and a second flip position with the back facing up. The rotary table has an internal exchange channel that extends left and right and allows nuts to pass through. The front of the rotary table has a first recess that can accommodate nuts, and the back has a second recess that can accommodate nuts. The first and second recesses are arranged at intervals from left to right and are both connected to the exchange channel. The actuating unit is movably mounted on the rotating platform and includes an actuating component and a blocking component connected to each other. The actuating component is movably inserted into the exchange channel so as to push the nut in the first sink to move into the second sink via the exchange channel. The blocking component is located on the back side of the rotating platform and has an intercepting position that intercepts the opening of the second sink and a avoidance position that is away from the intercepting position. Two sets of the first detection cameras are arranged above the rotating platform; in the first flip position, the detection end of the first set of first detection cameras faces the first sedimentation tank; in the second flip position, the detection end of the second set of first detection cameras faces the second sedimentation tank.

2. The nut flipping detection device according to claim 1, characterized in that: The nut flipping detection device includes a reference base, a lifting platform, a lifting driver, and a leveling component; The lifting platform is movably mounted on the reference base and has a flip-up operation position and a leveling position; the lifting drive is used to drive the lifting platform to move back and forth between the flip-up operation position and the leveling position; The leveling assembly is arranged on the lifting platform with left and right intervals, and includes a bracket, a leveling block, and a first spring; the leveling block is arranged on the bracket and can move up and down and rotate about the central axis extending forward and backward; the first spring abuts between the bracket and the leveling block and has an elastic force to drive the leveling block to move downward. The first end of the rotary table in the axial direction is rotatably connected to the leveling block on the first side; the second end of the rotary table in the axial direction is movably inserted into the leveling block on the second side along the axial direction of the rotary table, and can rotate relative to the leveling block. The reference base is provided with a leveling column located below the rotary table; in the leveling position, the leveling column abuts against the back of the rotary table in the first flip position and against the front of the rotary table in the second flip position.

3. The nut flipping detection device according to claim 2, characterized in that: The leveling block on the second side is provided with a shaft hole; the second end of the rotary table in the axial direction is connected to the shaft hole through a central shaft.

4. The nut flipping detection device according to claim 2, characterized in that: The leveling block on the first side is provided with a friction surface; the rotating platform is provided with a friction mating surface; the friction surface and the friction mating surface abut against each other in the axial direction of the rotating platform.

5. The nut flipping detection device according to claim 2, characterized in that: The nut flipping detection device includes a nut rotating mechanism and a second detection camera; The first settling tank has a detection opening on its side wall; the second detection camera is located next to the rotary table; in the leveling position, the detection end of the second detection camera faces the detection opening. The nut rotation mechanism is mounted on a reference base and is used to drive the nut in the first groove in the first flip position to rotate around the vertically extending central axis in the leveling position.

6. The nut flipping detection device according to claim 5, characterized in that: The nut rotating mechanism includes a rotating rod, a rotating driver, and a clamping unit; The rotating rod is mounted on a reference base and extends vertically; the rotating driver is used to drive the rotating rod to rotate around its own central axis. The clamping unit is located at the top of the rotating rod and includes a spring and an airbag; Several of the aforementioned spring pieces are spaced apart on the rotating rod along the circumferential direction, and each has a spring end that moves radially along the rotating rod. The airbag is disposed between each elastic piece and has an air-expanded state and an air-inflated state that drives the elastic ends of each elastic piece to move to the relatively outward. In the leveling position, the clamping unit has an insertion position that is inserted into the nut from both the top and bottom; and in the insertion position, when the airbag is in an inflated state, the elastic end of the spring abuts against the inner wall of the nut.

7. The nut flipping detection device according to claim 6, characterized in that: The nut rotating mechanism includes an air pump; the interior of the rotating rod is provided with an air passage that communicates with the air inlet of the airbag; the rotating rod is provided with a pneumatic rotary joint that communicates with the air passage; the air pump is connected to the pneumatic rotary joint.

8. The nut flipping detection device according to claim 6, characterized in that: The airbag has a ring structure; a central column is provided on the top surface of the rotating rod; the airbag is sleeved on the central column; a pressure plate is threadedly connected to the central column above the airbag; the airbag is limited between the pressure plate and the top surface of the rotating rod.

9. The nut flipping detection device according to claim 1, characterized in that: The second settling tank has an inlet and outlet on its side wall for the nuts to enter and exit.

10. A nut flipping detection device according to claim 1, characterized in that: A second spring is provided between the actuating unit and the rotary table; the second spring has an elastic force that drives the actuating unit to move away from the second sink.

Images