Automatic detection mechanism

Abstract

The present invention provides an automatic detection mechanism, including: an image capture component for capturing images of an object to be detected; a support component for supporting the object to be detected in the form of an inclined surface; a motion component for driving the support component to move so that the object to be detected located on the support component moves to a preset image capture station; a limit component for limiting the object to be detected located on the support component so that the position of the object to be detected is fixed on the support component in the first process, and for releasing the limit on the object to be detected located on the support component so that the object to be detected can move relative to the support component in the second process; and a shielding component for maintaining shielding of the lower end position of the inclined surface until the limit component releases the limit, and then releases the shielding of the lower end position of the inclined surface, so that the object to be detected slides down along the inclined surface in the second process. The present invention can realize continuous automatic machine detection, and the detection is efficient.

Description

Technical Field

[0001] The invention relates to the field of inspection and detection, and in particular to a mechanism for performing inspection using machine vision. Background Art

[0002] Products need to be inspected during the production process. For products with very large production volumes, it takes a lot of manpower to inspect each product. Therefore, such products are usually inspected by random sampling. However, random sampling can easily lead to product defects that are difficult to detect. In addition, manual quality inspection requires high experience from personnel, and there is a problem of poor quality inspection stability.

[0003] With the development of machine vision technology, by photographing products and using machine vision technology to analyze quality problems on products, general inspections can be achieved and reliance on human experience can be greatly reduced.

[0004] However, the above method needs to be coordinated with a set of automatic detection mechanisms to implement the entire process so that the detection can be stably repeated multiple times. Such automatic detection mechanisms are currently lacking. Summary of the invention

[0005] The present invention aims to provide an automatic detection mechanism for stably realizing product detection using a machine vision method.

[0006] To achieve the above object, the present invention proposes the following technical solutions:

[0007] Automatic detection mechanism, including:

[0008] An image acquisition component, used for acquiring images of the object to be tested;

[0009] A supporting component, providing support for the object to be tested in the form of an inclined surface;

[0010] A motion component drives the supporting component to move so that the object to be tested located on the supporting component moves to a preset image capturing station;

[0011] a limiting component for limiting the position of the object to be tested on the supporting component so that the object to be tested is fixed on the supporting component in a first process, and for releasing the limit on the object to be tested on the supporting component so that the object to be tested can move relative to the supporting component in a second process;

[0012] A shielding component keeps shielding the lower end of the inclined plane until the limiting component releases the limit, thereby releasing the shielding of the lower end of the inclined plane, so that the object to be tested slides down along the inclined plane in the second process;

[0013] The limiting component and the shielding component are mechanically linked structures, and the start time of the shielding component to release the shielding is later than the time when the limiting component releases the limit;

[0014] The first process ends after the image capture is completed, and the second process starts after the image capture is completed.

[0015] Furthermore, the limit assembly includes:

[0016] A first limiting portion, fixed to one side of the inclined surface of the supporting component;

[0017] A second limiting portion, movably disposed on the other side of the inclined surface of the supporting component;

[0018] The first motor is mechanically connected to the second limiting part and controls the distance between the second limiting part and the first limiting part through the rotation direction of the first motor, so as to realize whether the limiting component limits the object to be tested.

[0019] Furthermore, a lead screw is disposed on the output shaft of the first motor, and the output shaft and the lead screw are both disposed in the direction of relative displacement between the second limiting portion and the first limiting portion;

[0020] The lead screw is provided with a first pushing portion, which is used to push and pull the second limiting portion and move along the length direction of the lead screw as the lead screw rotates to change the distance between the second limiting portion and the first limiting portion.

[0021] Furthermore, a first gear is disposed at one end of the lead screw, a second gear is meshed with the first gear, and the first gear and the second gear are both fixed around a central axis;

[0022] A second pushed portion is fixed on the shielding component;

[0023] The second gear is coaxially provided with a second pushing portion, which is used to contact the second pushed portion after the first motor rotates a preset angle in the first direction and continues to push the shielding assembly to move from top to bottom as the first motor rotates until the shielding assembly releases the shielding of the lower end position of the inclined surface. The first direction is the direction for controlling the first limiting portion and the second limiting portion to move away from each other.

[0024] Furthermore, it also includes:

[0025] The rebound part provides a rebound force to the shielding component when the shielding component moves to a position where the shielding is released.

[0026] Furthermore, a first conductive part is provided on the first limiting part, and a second conductive part is provided on the second limiting part; when the first limiting part and the second limiting part limit and release the limit of the object to be tested, the first conductive part and the second conductive part are connected and disconnected by the object to be tested.

[0027] Furthermore, it also includes a base, and the supporting component, the limiting component and the shielding component are directly or indirectly arranged on the base;

[0028] The motion component comprises:

[0029] A guide rail, cooperating with the base to provide a movement guide for the base;

[0030] A second motor is mechanically connected to the base and moves the base along the guide rail.

[0031] Furthermore, photoelectric switches are provided at key positions on the movement path of the base, and the key positions include at least one of the following: a starting position, an end position, and an image capturing position.

[0032] Furthermore, the axial direction of the first motor is a first direction, the axial direction of the second motor is a second direction, the first direction is parallel to the second direction; and the normal direction of the inclined plane is perpendicular to the first direction.

[0033] Furthermore, the image acquisition component includes an image acquisition device and a position adjustment device, the image acquisition device is fixed near the image acquisition station through the position adjustment device, and the position adjustment device is used to adjust the distance and angle between the image acquisition device and the object to be measured.

[0034] It can be known from the above technical scheme that the technical scheme of the present invention provides an automatic detection mechanism, including: an image capture component, which is used to capture images of an object to be detected; a supporting component, which provides support for the object to be detected in the form of an inclined surface; a moving component, which drives the supporting component to move so that the object to be detected located on the supporting component moves to a preset image capture station; a limiting component, which limits the object to be detected located on the supporting component so that the position of the object to be detected is fixed on the supporting component in the first process, and releases the limit on the object to be detected located on the supporting component so that the object to be detected is movable relative to the supporting component in the second process; a shielding component, which keeps shielding the lower end position of the inclined surface until the limiting component releases the limit, and then releases the shielding of the lower end position of the inclined surface, so that the object to be detected slides down along the inclined surface in the second process; the limiting component and the shielding component are mechanically linked structures, and the start time of the shielding component releasing the shielding is later than the time of the limiting component releasing the limit; wherein, the first process ends after the image capture is completed, and the second process starts after the image capture is completed. Through the above solution, machine vision inspection of the objects to be inspected and the blanking after inspection are automatically realized.

[0035] It should be appreciated that all combinations of the foregoing concepts, as well as additional concepts described in greater detail below, may be considered to be part of the inventive subject matter of the present disclosure, provided such concepts are not mutually inconsistent.

[0036] The foregoing and other aspects, embodiments and features of the present invention can be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as the features and / or beneficial effects of the exemplary embodiments, will be apparent from the following description or learned from the practice of the specific embodiments according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For clarity, not every component is labeled in every figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, in which:

[0038] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0039] Figure 2 It is a structural schematic diagram of a fixing assembly according to an embodiment of the present invention;

[0040] Figure 3 It is a left side view of the fixing assembly of the embodiment of the present invention;

[0041] Figure 4is a cross-sectional view of a fixing assembly according to an embodiment of the present invention;

[0042] In the figure, the meanings of the reference numerals are as follows:

[0043] The first camera 1; the second camera 2; the third camera 3; the first light source 4; the second light source 5; the third light source 6; the guide rail 7; the second motor 8; the first motor 9; the lead screw 10; the lead screw fixing seat 11; the first gear 12; the second gear 13; the supporting assembly 14; the first limiting portion 15; the second limiting portion 16; the reducer 17; the second pushing portion 18; the second pushed portion 19; the shielding assembly 20; the rebound portion 21; the shading plates 22, 24; the photoelectric switches 23, 25; the first coupling 26; the rotating platform 27; the sliding platform 28; the first slider 29; the second slider 30; the third slider 31; the connecting plate 32; the first conductive portion 33. DETAILED DESCRIPTION

[0044] In order to better understand the technical content of the present invention, specific embodiments are given and described as follows in conjunction with the accompanying drawings.

[0045] Various aspects of the present invention are described in this disclosure with reference to the accompanying drawings, in which many illustrative embodiments are shown. The embodiments of the present disclosure are not necessarily defined to include all aspects of the present invention. It should be understood that the various concepts and embodiments introduced above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed by the present invention are not limited to any implementation. In addition, some aspects disclosed by the present invention can be used alone, or in any appropriate combination with other aspects disclosed by the present invention.

[0046] like Figure 1 As shown, an embodiment of the present application provides an automatic detection mechanism for detecting the surface quality of railway track spring clips, and the detection contents include size, surface quality defects, etc. The detection means is to fix the spring clips and obtain a picture of the spring clip surface by shooting, and use machine vision technology to analyze whether there are spring clip quality problems in the above-obtained pictures, thereby replacing manual detection of the spring clips. Since the use of machine vision usually sets several image capture stations, in order to achieve consistency of the above-mentioned automated detection, the automatic detection mechanism in this embodiment needs to be able to fix the spring clips before shooting, transport the spring clips to the image capture station, and put down the spring clips after shooting to release new fixed space for the next spring clip to be detected and repeat the above process.

[0047] The device that meets the above functions can be applied to the detection of various objects, and is not limited to the spring bar detection described in this embodiment. In order to fully introduce the above device, this embodiment still uses the spring bar as the detection object for detection.

[0048] like Figure 1 As shown, the specific structure of the automatic detection mechanism of this embodiment is as follows, including:

[0049] The image acquisition component is used to acquire images of the object to be tested. Figure 1 In the embodiment, the image acquisition component includes an acquisition device and a position adjustment device. The image acquisition device is fixed near the image acquisition station by the position adjustment device. The position adjustment device is used to adjust the distance and angle between the image acquisition device and the object to be tested. Specifically, in order to detect the elastic strip, the acquisition device provided in this embodiment includes a first camera 1, a second camera 2 and a third camera 3. The above-mentioned cameras are arranged separately as needed so that the elastic strip can be photographed at different angles according to the requirements of quality inspection. In order to ensure the quality of the captured image is reliable, a first light source 4, a second light source 5 and a third light source 6 are respectively provided for the above-mentioned acquisition device. The above-mentioned position adjustment device, including but not limited to a rotating platform 27 and a sliding platform 28, as Figure 1 The third camera 3 shown is slidably set on a slide rail, and the ideal track direction of the slide rail is perpendicular to the object to be tested. The third camera 3 can adjust the position on the slide rail to achieve the distance between the lens of the third camera 33 and the object to be tested, that is, the change of the distance between the lens and the object to be tested is achieved through the slide rail type sliding platform 28. The sliding platform 28 is rotatably set on a rotating shaft as a whole, and the axial direction of the rotating shaft is perpendicular to the sliding direction of the slide rail. Therefore, the sliding platform 28 can be driven by the rotating shaft to rotate as a whole, thereby realizing the adjustment of the direction of the slide rail to meet the need to adjust the shooting angle in some cases. The specific implementation methods of the above-mentioned rotating platform 27 and sliding platform 28 include but are not limited to the methods described above in the embodiments of the present application, and those skilled in the art can design other possible solutions as needed.

[0050] During the inspection, the spring bar needs a support to hold it up, so the present embodiment includes a support assembly 14, the main structure of which is a support plate, and the support plate provides support for the object to be inspected in the form of an inclined surface. The spring bar is placed on the inclined surface so that it can slide down the inclined surface to achieve material drop after the inspection of the spring bar is completed. The specific slope of the inclined surface needs to take into account both the smooth sliding of the spring bar and the convenience of image capture.

[0051] During the whole process of detecting the spring bar, since there are multiple image capturing stations, it is necessary to drive the spring bar to move. Therefore, this embodiment includes a motion component, which is used to drive the support component 14 to move so that the object to be detected located on the support component 14 moves to the preset image capturing station. This embodiment makes it easy to identify the above-mentioned image capturing station by setting the cooperation of the photoelectric switch 25 and the light shielding plate 24, wherein multiple photoelectric switches 25 are provided, each photoelectric switch 25 is used to indicate each image capturing station, and the light shielding plate 24 is provided on the motion component. The light shielding plate 24 moves synchronously with the motion component to the photoelectric switch 25, so that the level of the photoelectric switch 25 changes, thereby controlling the motion component to stop, and then the image capturing component works until the image is captured, and then the motion component is controlled to start again to continue to move to the next station.

[0052] In addition to moving between the image capture stations, the above-mentioned motion component needs to set a starting station and an end station in consideration of the fact that the entire device can work repeatedly and stably. The starting station is used for the station where the spring bar is placed on the supporting component 14 from outside the entire device. This step is usually realized automatically, so the starting station needs to be fixed. After each detection of the previous spring bar, the supporting component 14 needs to be returned to the starting station, that is, the base reset process. Among them, the end station is a station for controlling the return of the supporting component 14. By controlling the supporting component 14 to move to the end station first and then return to the starting station each time, the flow process of the entire supporting component 14 between the stations is unified, which is convenient for repeated detection of the spring bar. The sensing of the above-mentioned starting station and end station can also be achieved by setting a photoelectric switch 25 at the starting station and the end station, and by the cooperation of the photoelectric switch 25 and the sunshade 24.

[0053] Specifically, the above-mentioned motion assembly includes a guide rail 7 and a second motor 8. The support assembly 14 is arranged on the guide rail 7 through a base. The second motor 8 is mechanically connected to the base and enables the base to move along the guide rail 7. Figure 2 As shown in the figure, a first coupling 26 is arranged on the output shaft of the second motor 8, the guide rail 7 is a straight guide rail, a lead screw is built into the straight guide rail, the base is mounted on the lead screw, one end of the straight guide rail is a starting position and the other end is a terminal position, and the second motor 8 drives the base to move on the guide rail 7 through the first coupling 26. A light shielding plate 24 is fixed on the base, and photoelectric switches 25 are respectively fixed at both ends of the guide rail 7, and the current position of the base on the guide rail 7 is known through the cooperation of the light shielding plate 24 and the photoelectric switch 25.

[0054] In order to fix the spring bar at the right time and release the restriction on the spring bar in time so that it can drop the material smoothly, a limit assembly and a shielding assembly 20 are directly or indirectly arranged on the base of this embodiment.

[0055] The limiting assembly is used to limit the object to be tested on the supporting assembly 14 so that the position of the object to be tested is fixed on the supporting assembly 14 in the first process, and to release the limiting of the object to be tested on the supporting assembly 14 so that the object to be tested can move relative to the supporting assembly 14 in the second process.

[0056] Among them, the first process is the process of fixing the position of the object to be tested until the image acquisition is completed. This process requires keeping the position of the object to be tested in a fixed state. The second process is that after the image acquisition is completed, the object to be tested needs to be blanked. Therefore, the position limit of the object to be tested needs to be released.

[0057] like Figure 2 As shown, the limiting assembly includes: a first limiting portion 15 fixed to one side of the inclined surface of the supporting assembly 14; and a second limiting portion 16 movably arranged on the other side of the inclined surface of the supporting assembly 14. In the figure, the inclined surface of the supporting assembly 14 is oriented toward the outside of the paper, the first limiting portion 15 is arranged on the left side of the inclined surface, the second limiting portion 16 is arranged on the right side of the inclined surface and is provided with a first slider 29 for sliding with a slide rail, the first limiting portion 15 and the second limiting portion 16 cooperate to achieve limiting and releasing the limiting of the object to be tested, specifically, the second limiting portion 16 is movably arranged so that the space between the first limiting portion 15 and the second limiting portion 16 is variable, when the distance between the two is small, the limiting of the object to be tested is achieved, and when the distance between the two is large, the limiting of the object to be tested is released. The movement of the second limiting part 16 is realized by the first motor 9, which is mechanically connected to the second limiting part 16 and controls the second limiting part 16 to change the distance between the first limiting part 15 and the first limiting part 15 through the rotation direction of the first motor 9, so as to realize whether the limiting component limits the object to be tested. Figure 2 As shown, the first motor 9 is fixed to the lower part of the first limit part 15 on the left side of the figure, and a fixed side plate is provided on the base below the second limit part 16 on the right side of the figure. A screw 10 is provided on the output shaft of the first motor 9, and the other end of the screw 10 passes through the fixed side plate. The output shaft and the screw 10 are both provided in the direction of the relative displacement between the second limit part 16 and the first limit part 15. The screw 10 is provided with a first pushing part, which is used to push and pull the second limit part 16 as the screw 10 rotates and moves along the length direction of the screw 10. Figure 4As shown, specifically, the first push part includes a screw fixing seat 11, a connecting plate 32 and a third slider 31 which are fixedly connected to each other. The screw fixing seat 11 is sleeved on the screw 10. The third slider 31 cooperates with the bottom of the supporting plate on the supporting assembly 14 through a track slider structure. The main body of the second limiting part 16 is a side plate. The connecting plate 32 is fixedly connected to the side plate of the second limiting part 16. When the first push part moves with the movement of the screw 10, the second limiting part 16 is driven to move along the direction of the screw 10, so that the distance between the first limiting part 15 and the second limiting part 16 changes. When the distance increases and becomes too large to clamp the object to be detected, the object to be detected is released from the limit. When the distance decreases and becomes too small to clamp the object to be detected, the object to be detected is limited. The change of the above distance is mainly controlled by the steering of the first motor 9. The forward and reverse rotations control the limit and release of the limit respectively.

[0058] In order to facilitate the control system to determine whether the limit is completed and the limit is released, a first conductive part 33 is provided on the first limit part 15, and a second conductive part is provided on the second limit part 16. In the figure, the second conductive part is arranged opposite to the first conductive part 33; when the first limit part 15 and the second limit part 16 limit and release the limit of the object to be tested, the first conductive part 33 and the second conductive part are connected and disconnected by the object to be tested. When the first conductive part 33 and the second conductive part can be connected, it is considered that the limit is completed, otherwise, it is considered that the limit is released.

[0059] The shielding component 20 cooperates with the blanking function, see Figure 2 and Figure 4 The shielding component 20 is used to keep shielding the lower end of the inclined plane until the limit component releases the limit, so that the object to be tested slides down along the inclined plane in the second process; the limit component and the shielding component 20 are mechanically linked structures, and the start time of releasing the shielding by the shielding component 20 is later than the time when the limit component releases the limit.

[0060] The main body of the shielding assembly 20 is a shielding plate and a second slider 30 is arranged on it for sliding with a guide rail. The upper edge of the shielding plate is higher than the lower end of the inclined plane, so the object to be detected on the inclined plane can be shielded to prevent it from sliding off the inclined plane. When the upper edge of the shielding plate drops below the lower end of the inclined plane, the object to be detected cannot be shielded, so that the object to be detected can be automatically dropped under the combined action of its own weight and friction. Since the spring bar has a certain elasticity, and the restriction of the spring bar by the limiting assembly will cause the spring bar to be slightly deformed toward the side of the shielding plate, so the spring bar fits tightly to the shielding plate. Therefore, during the dropping process, it is necessary to wait for the limiting assembly to completely release the restriction on the spring bar before controlling the shielding assembly 20 to release the shielding, otherwise the pressure between the shielding assembly 20 and the spring bar will hinder the movement of the shielding assembly 20.

[0061] In this embodiment, the specific structure of the mechanism for realizing the movement of the shielding component 20 is as follows:

[0062] A first gear 12 is provided on the output shaft of the first motor 9, and a second gear 13 is meshed with the first gear 12, and the first gear 12 and the second gear 13 are both fixed to the central axis; a second pushed portion 19 is fixed on the shielding component 20; a second pushing portion 18 is coaxially provided on the second gear 13, which is used to contact the second pushed portion 19 after the first motor 9 rotates a preset angle in the first direction and continue to push the shielding component 20 to move from top to bottom as the first motor 9 rotates until the shielding component 20 releases the shielding of the lower end position of the inclined surface, and the first direction is the direction for controlling the first limiting portion 15 and the second limiting portion 16 to move away from each other.

[0063] Specifically as 2 and Figure 4 As shown, the first gear 12 is placed at the end of the screw 10 and is located near the fixed side plate. The rotation of the first motor 9 is transmitted to the first gear 12 through the screw 10. The second gear 13 is arranged in the same plane as the first gear 12. The output shaft of the second gear 13 passes through the fixed side plate and is located below the support plate. The output shaft of the second gear 13 is preferably provided with a reducer 17 to reduce the speed and transmit it to the second pushing part 18. As shown in the figure, the second pushing part 18 has an axial hole, and the axial hole is sleeved on the output end of the reducer 17. The second pushing part 18 has a rod-shaped object as the second pushing part 18. The second pushed part 19 on the shielding plate is located near the rod-shaped object and can enable the rod-shaped object to apply a downward pushing force to the second pushing part 18. Figure 4 As shown, in the direction of the paper, when the rod-shaped object rotates clockwise, the second pushed portion 19 is pressed downward, thereby driving the shielding plate to move downward.

[0064] When the blanking is completed, the device needs to prepare for the detection of the next object to be tested, so it needs to complete the reset process, including the process of the shielding component 20 returning to the shielding state, the limiting component resetting and the base resetting, so as to realize the base returning to the starting position and when the next object to be tested is placed on the supporting plate of the supporting component 14, the limiting component re-limits the object to be tested. A rebound part 21 is arranged below the shielding component 20, specifically a plurality of spring rods arranged along the shielding plate, which provide a rebound force to the shielding component 20 moving to the position after the shielding is released, and at the same time, the first motor 9 also rotates, thereby releasing the downward pressure applied to the shielding component 20 by the second pushing part 18. At this time, the rotation speed of the first motor 9 is controlled so that the second pushing part 18 is always in contact with the second pushed part 19 on the shielding component 20, but almost powerless or only very small force to avoid changing the relative position relationship between the second pushing part 18 and the second pushed part 19. The reset of the limit assembly is completed before the reset of the base. A photoelectric switch 23 and a shielding plate 22 are provided for the reset of the limit assembly. The photoelectric switch 23 has two, which are used to indicate the state in which the distance between the second limit part 16 and the first limit part 15 in the limit assembly is reduced to the minimum, that is, the limit state, and the state in which the distance between the second limit part 16 and the first limit part 15 is expanded to the maximum. When the limit assembly is reset, the second limit part 16 first moves toward the first limit part 15 and then moves away from it by triggering one of the photoelectric switches 23 until the other photoelectric switch 23 is triggered, thereby completing the reset of the limit assembly. The above-mentioned photoelectric switch 23 is triggered to change the direction of the second motor 9 to realize the reset process of the limit assembly.

[0065] In this embodiment, the axial direction of the first motor 9 is the first direction, the axial direction of the second motor 8 is the second direction, the first direction is parallel to the second direction, and the normal direction of the inclined surface is perpendicular to the first direction. In this way, the opening and closing direction of the limit assembly is consistent with the movement direction of the entire base, and the movement of the shielding assembly 20 is completed at the same time, the overall structural design is compact, and the linkage design is ingenious.

[0066] The control of the above-mentioned device is completed through a control system. The control system senses the current state of the mechanical structure through a number of sensing signals set in the device to control the next movement. The specific sensing devices include the on-off signals of the photoelectric switch mentioned above, the on-off signals of the conductive switch, etc. The above-mentioned design can organically control the entire mechanical device and complete the detection of the object to be tested continuously and multiple times according to the set program, with a high degree of automation.

[0067] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims

1. Automatic detection mechanism, characterized by: include: An image acquisition component, used for acquiring images of the object to be tested; A supporting component, providing support for the object to be tested in the form of an inclined surface; A motion component drives the supporting component to move so that the object to be tested located on the supporting component moves to a preset image capturing station; a limiting component for limiting the position of the object to be tested on the supporting component so that the object to be tested is fixed on the supporting component in a first process, and for releasing the limit on the object to be tested on the supporting component so that the object to be tested can move relative to the supporting component in a second process; A shielding component keeps shielding the lower end of the inclined plane until the limiting component releases the limit, thereby releasing the shielding of the lower end of the inclined plane, so that the object to be tested slides down along the inclined plane in the second process; The limiting component and the shielding component are mechanically linked structures, and the start time of the shielding component to release the shielding is later than the time when the limiting component releases the limit; Wherein, the first process ends after the image acquisition is completed, and the second process starts after the image acquisition is completed; The limiting component comprises: A first limiting portion, fixed to one side of the inclined surface of the supporting component; A second limiting portion, movably disposed on the other side of the inclined surface of the supporting component; A first motor is mechanically connected to the second limiting part and controls the distance between the second limiting part and the first limiting part through the rotation direction of the first motor, so as to realize whether the limiting component limits the object to be tested; The first limiting part is provided with a first conductive part, and the second limiting part is provided with a second conductive part; when the first limiting part and the second limiting part limit and release the limit of the object to be tested, the first conductive part and the second conductive part are connected and disconnected by the object to be tested; when the first conductive part and the second conductive part can be connected, it is considered that the limit is completed, otherwise, it is considered that the limit is released; The main body of the shielding assembly is a shielding plate and a second slider is arranged on it for sliding with a guide rail. When the upper edge of the shielding plate is higher than the lower end of the inclined plane, the object to be detected on the inclined plane is shielded to prevent it from sliding off the inclined plane. When the upper edge of the shielding plate drops below the lower end of the inclined plane, the object to be detected cannot be shielded, so that the object to be detected is automatically dropped under the combined action of its own weight and friction.

2. The automatic detection mechanism according to claim 1, characterized in that: A lead screw is disposed on the output shaft of the first motor, and the output shaft and the lead screw are both disposed in the direction of relative displacement between the second limiting portion and the first limiting portion; The lead screw is provided with a first pushing portion, which is used to push and pull the second limiting portion and move along the length direction of the lead screw as the lead screw rotates to change the distance between the second limiting portion and the first limiting portion.

3. The automatic detection mechanism according to claim 2, characterized in that: A first gear is disposed at one end of the lead screw, a second gear is meshed with the first gear, and both the first gear and the second gear are fixed to a central axis; A second pushed portion is fixed on the shielding component; The second gear is coaxially provided with a second pushing portion, which is used to contact the second pushed portion after the first motor rotates a preset angle in the first direction and continues to push the shielding assembly to move from top to bottom as the first motor rotates until the shielding assembly releases the shielding of the lower end position of the inclined surface. The first direction is the direction for controlling the first limiting portion and the second limiting portion to move away from each other.

4. The automatic detection mechanism according to claim 2, characterized in that: Also includes: The rebound part provides a rebound force to the shielding component when the shielding component moves to a position where the shielding is released.

5. The automatic detection mechanism according to any one of claims 1 to 4, characterized in that: It also includes a base, and the supporting component, the limiting component and the shielding component are directly or indirectly arranged on the base; The motion component comprises: A guide rail, cooperating with the base to provide a movement guide for the base; A second motor is mechanically connected to the base and moves the base along the guide rail.

6. The automatic detection mechanism according to claim 5, characterized in that: Photoelectric switches are arranged at key positions on the movement path of the base, and the key positions include at least one of the following: a starting position, an end position, and an image capturing position.

7. The automatic detection mechanism according to claim 5, characterized in that: The axial direction of the first motor is a first direction, the axial direction of the second motor is a second direction, the first direction is parallel to the second direction; and the normal direction of the inclined plane is perpendicular to the first direction.

8. The automatic detection mechanism according to claim 5, characterized in that: The image acquisition component includes an image acquisition device and a position adjustment device. The image acquisition device is fixed near the image acquisition station through the position adjustment device. The position adjustment device is used to adjust the distance and angle between the image acquisition device and the object to be measured.

Images