Mask detection unit and detection device

Abstract

The utility model relates to the technical field of appearance detection, and discloses a mask detection unit and a detection device, which comprise a bracket, a computer module, a positioning jig, a light source assembly and a shooting assembly, the shooting assembly comprises a first camera, a second camera and a third camera, the light source assembly comprises a first light-emitting plate, a second light-emitting plate and a third light-emitting plate, the recognition direction of the first camera and the illumination direction of the first light-emitting plate are oppositely arranged in the Z direction, and the recognition direction of the second camera and the illumination direction of the second light-emitting plate are arranged in the Y direction. The recognition direction of the third camera and the illumination direction of the third light-emitting plate are arranged in the X direction. The mask is accurately positioned through the positioning jig, recognition is carried out in combination with the shooting assembly, only the local part, used for positioning, of the mask needs to be accurately measured, the positioning jig is machined, the whole special gauge does not need to be accurately machined, and the problem that special gauges need to be integrally customized one by one for mask products of different models is solved. And the special gauge is complex to process.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of appearance detection, especially a mask detection unit and detection device. BACKGROUND

[0002] In recent years, with the development and application of automation technology, the demand for accurate measurement and detection in various production processes is increasing. Especially in the production of mask products, the traditional manual measurement method faces many challenges. Traditionally, the size and shape of the mask change greatly, so the manual detection method is usually used, which not only has high labor intensity, but also has low accuracy, resulting in low product yield and production efficiency.

[0003] The mask detection technology currently available on the market mostly uses fixed special gauges. Each mask product needs a corresponding custom gauge for accurate measurement. This approach increases production costs and requires a lot of time and resources to develop and manufacture compatible gauges when facing different models and sizes of masks. In addition, masks often have size deviations and shape deformations after welding, further increasing the limitations and shortcomings of traditional detection methods.

[0004] Traditional manual measurement methods have many defects, including but not limited to: high labor intensity, low accuracy, low production efficiency, poor adaptability, etc. Since mask products are usually made of welded parts, deformation and inconsistent sizes often occur after welding, and traditional gauges cannot meet the requirements of precise positioning and measurement of masks with complex shapes and variable sizes. The fixed gauges used in the prior art not only increase production costs, but also limit flexibility and production efficiency in the mask production process. Therefore, there is an urgent need for a new mask detection technology that can effectively address the limitations of traditional technology in terms of accuracy, efficiency, and cost to improve the quality and efficiency of the mask production process. SUMMARY

[0005] To overcome the above-mentioned defects, the utility model provides a mask detection unit and detection device, which can automatically detect the size of the mask and is suitable for the shape detection of various models of products.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A mask detection unit, comprising a bracket, a computer module, a positioning jig, a light source assembly, and a shooting assembly;

[0008] The light source assembly and the shooting assembly are arranged on the bracket, the illumination direction of the light source assembly and the recognition direction of the shooting assembly are arranged oppositely, and the positioning jig is arranged between the light source assembly and the shooting assembly.

[0009] The computer module is electrically connected with the light source assembly and the shooting assembly, and the positioning jig is used for fixing the measured mask;

[0010] The shooting assembly comprises a first camera, a second camera and a third camera, and the light source assembly comprises a first light-emitting plate, a second light-emitting plate and a third light-emitting plate; the identification direction of the first camera and the illumination direction of the first light-emitting plate are oppositely arranged along the Z direction; the identification direction of the second camera and the illumination direction of the second light-emitting plate are arranged along the Y direction; and the identification direction of the third camera and the illumination direction of the third light-emitting plate are arranged along the X direction.

[0011] Preferably, the X, Y and Z directions are perpendicular to each other.

[0012] Preferably, the plate surface of the first light-emitting plate is arranged along the XY plane, the first light-emitting plate is provided with a first through hole along the Z direction, and the positioning jig is arranged in the first through hole.

[0013] Preferably, the support comprises a horizontally arranged bottom beam, the positioning jig comprises a base, a mounting block and a positioning block, the base is connected with the bottom beam, and the base is arranged between the first light-emitting plate and the bottom beam; the mounting block is arranged in the first through hole, one end of the mounting block is connected with the base, and the other end of the mounting block is connected with the positioning block; and the positioning block is used for positioning and mounting the measured mask.

[0014] Preferably, the top end of the positioning block is provided with a positioning groove, and the positioning groove is used for positioning and mounting the measured mask.

[0015] Preferably, the application further comprises a fourth light-emitting plate, the fourth light-emitting plate is arranged opposite to the first light-emitting plate, the fourth light-emitting plate and the first light-emitting plate are arranged on two sides of the positioning jig, and the illumination direction of the fourth light-emitting plate is arranged opposite to the illumination direction of the first light-emitting plate.

[0016] Preferably, the fourth light-emitting plate is arranged between the first camera and the positioning jig, the fourth light-emitting plate is provided with a second through hole along the Z direction, and the identification direction of the first camera passes through the second through hole.

[0017] Preferably, the application further comprises a holder, and the shooting assembly is fixed to the support through the holder.

[0018] Preferably, the application further comprises a supplementary camera and a supplementary illuminating lamp, the supplementary camera is used for supplementing the identification direction, and the supplementary illuminating lamp is used for supplementing the illumination direction.

[0019] A mask detection device, comprising a housing, a rack, a light curtain and the mask detection unit; the rack is arranged in the interior of the housing, the mask detection unit is arranged on the rack, the housing is provided with an observation window, and the light curtain is arranged on the observation window.

[0020] The technical scheme provided by the mask detection device can have the following beneficial effects:

[0021] The first camera, the second camera and the third camera are used to identify the mask from the X, Y and Z directions, three-dimensional positioning is performed on the feature points on the mask, and the deviation is calculated and feedback data is provided by comparing the data pre-recorded in the computer module, and the measurement accuracy is less than 0.1 mm.

[0022] The mask is correctly placed by the positioning jig, the part of the mask located at the rear side of the identification direction of the shooting assembly is avoided to affect detection, and the shooting assembly and the light source assembly are relatively arranged on the two sides of the mask, detection and illumination are performed from three directions, and the problem that the steel wire located at the rear side of the identification direction of the shooting assembly is incorrectly identified and affects the detection accuracy during mask detection is solved.

[0023] The mask is accurately positioned by the positioning jig, and then the shooting assembly is used for identification, the positioning jig is only needed to be accurately measured and processed for the part of the mask used for positioning, the whole special gauge does not need to be accurately processed, the problem that different models of mask products need to be customized with special gauges one by one is solved, and the problem that the special gauges are complex to process is solved.

[0024] The positioning jig passes through the first through hole to position the mask directly above the first light-emitting plate, the first light-emitting plate is convenient for illuminating the whole mask, and the problem that the positioning jig affects the overall illumination and identification efficiency is solved.

[0025] When the mask is replaced, the positioning block is only needed to be replaced by loosening the bolt, and positioning and detection of masks of different specifications can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a perspective structural schematic view of an embodiment of the utility model.

[0027] Figure 2 It is another direction perspective structural schematic view of an embodiment of the utility model.

[0028] Figure 3 It is a perspective structural schematic view of a positioning jig with a mask of an embodiment of the utility model.

[0029] Figure 4 It is a perspective structural schematic view of a positioning groove part of a positioning jig of an embodiment of the utility model.

[0030] Figure 5The utility model discloses a three -dimensional structure schematic diagram of the mask detection device of an embodiment.

[0031] Wherein: support 1, bottom crossbeam 11, positioning fixture 3, base 31, mounting block 32, positioning block 33, positioning groove 34, light source assembly 4, first light emitting plate 41, first through hole 411, second light emitting plate 42, third light emitting plate 43, fourth light emitting plate 44, second through hole 441, first camera 51, second camera 52, third camera 53, mask 6, shell 7, observation window 71, rack 8. DETAILED DESCRIPTION

[0032] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as the limitation of the utility model.

[0033] In the description of the utility model, it is understood that the terms "longitudinal", "transverse"

[0034] The orientation or position relationship indicated by "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the utility model. In addition, the features limited by "first" and "second" can explicitly or implicitly include one or more features, which are used to distinguish the described features, and there is no order or difference.

[0035] In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more.

[0036] In the description of the utility model, it is explained that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0037] The embodiments of the utility model are described below in conjunction with the drawings.

[0038] A mask detection unit, comprising a bracket 1, a computer module, a positioning jig 3, a light source assembly 4 and a shooting assembly;

[0039] The light source assembly 4 and the shooting assembly are arranged on the bracket 1, the light direction of the light source assembly 4 and the recognition direction of the shooting assembly are arranged oppositely, and the positioning jig 3 is arranged between the light source assembly 4 and the shooting assembly;

[0040] The computer module is electrically connected with the light source assembly 4 and the shooting assembly, and the positioning jig 3 is used for fixing the measured mask 6;

[0041] The shooting assembly comprises a first camera 51, a second camera 52 and a third camera 53, the light source assembly 4 comprises a first light-emitting plate 41, a second light-emitting plate 42 and a third light-emitting plate 43, the recognition direction of the first camera 51 and the light direction of the first light-emitting plate 41 are arranged oppositely along the Z direction, the recognition direction of the second camera 52 and the light direction of the second light-emitting plate 42 are arranged along the Y direction, and the recognition direction of the third camera 53 and the light direction of the third light-emitting plate 43 are arranged along the X direction.

[0042] As shown in Figure 1 and Figure 2 , the measured mask 6 is placed on the positioning jig 3, the mask 6 is recognized from three directions of X, Y and Z by the first camera 51, the second camera 52 and the third camera 53, the feature points on the mask 6 are three-dimensionally positioned, and the deviation is calculated and feedback data is provided by comparing with the data pre-recorded in the computer module, so that the measurement accuracy is less than 0.1mm.

[0043] As shown in Figure 3 , in specific embodiments, the recognized mask 6 is a mesh-shaped mask 6 welded by steel wires, since there are many hollow parts in the mask 6, the mask 6 needs to be correctly placed by the positioning jig 3 to avoid the influence of the part of the mask 6 located at the rear side of the recognition direction of the shooting assembly on detection, and the shooting assembly and the light source assembly 4 are arranged oppositely on both sides of the mask 6 to detect and illuminate from three directions, so that the problem of incorrect recognition of the steel wire located at the rear side of the recognition direction of the shooting assembly during mask 6 detection is solved, and the detection accuracy is affected.

[0044] The mask 6 is accurately positioned by the positioning jig 3, and then recognized by the shooting assembly, so that only the part of the mask 6 used for positioning needs to be accurately measured and processed to form the positioning jig 3, and the whole special gauge does not need to be accurately processed, so that the problem of whole special gauges for different models of mask 6 products needing to be customized one by one is solved, and the processing of the special gauges is complicated.

[0045] Preferably, the X, Y and Z directions are perpendicular to each other.

[0046] In specific embodiments, the Z direction is a vertical direction, the XY plane is a horizontal plane, and the X, Y and Z directions are perpendicular to each other, which facilitates the calculation of deviation data and manual identification of deviation data.

[0047] Preferably, the first light-emitting plate 41 is arranged along the XY plane, the first light-emitting plate 41 is provided with a first through hole 411 in the Z direction, and the positioning jig 3 is arranged in the first through hole 411.

[0048] In specific embodiments, the first through hole 411 is arranged at the center of the first light-emitting plate 41, and the positioning jig 3 is arranged above the first light-emitting plate 41 through the first through hole 411, which facilitates the illumination of the first light-emitting plate 41 on the whole face mask 6 and solves the problem of the positioning jig 3 affecting the overall illumination and recognition efficiency.

[0049] Preferably, the bracket 1 comprises a horizontal bottom beam 11, the positioning jig 3 comprises a base 31, a mounting block 32 and a positioning block 33, the base 31 is connected to the bottom beam 11, and the base 31 is arranged between the first light-emitting plate 41 and the bottom beam 11, the mounting block 32 is arranged in the first through hole 411, one end of the mounting block 32 is connected to the base 31, the other end of the mounting block 32 is connected to the positioning block 33, and the positioning block 33 is used for positioning the measured face mask 6.

[0050] As shown in Figure 2 and Figure 3 The placement position and angle of the face mask 6 on the positioning jig 3 directly affect the accuracy of the overall detection. If the positioning jig 3 is installed with deviation, the face mask 6 will also be positioned with deviation and cannot be normally detected. The base 31 of the positioning jig 3 is arranged between the first light-emitting plate 41 and the bottom beam 11, which solves the problem of the base 31 being too large to affect the illumination of the first light-emitting plate 41 and the problem of the base 31 being too small to ensure the installation accuracy of the positioning jig 3.

[0051] In specific embodiments, the base 31 is first installed on the bottom beam 11, then the first light-emitting plate 41 is installed in place, one end of the mounting block 32 is then arranged in the first through hole 411 and is installed on the base 31 through a matched bolt, and finally the positioning block 33 is installed on the mounting block 32 and is locked through a matched bolt and nut. When the face mask is replaced, the bolt only needs to be loosened to replace the positioning block 33, so that the positioning and detection of face masks of different specifications can be realized.

[0052] Preferably, the top end of the positioning block 33 is provided with a positioning groove 34, and the positioning groove 34 is used for positioning and installing the measured face mask 6.

[0053] In specific embodiments, the positioning groove 34 has different shapes according to different types of masks. By using the precisely machined positioning groove 34, the mask is partially positioned and installed, the overall positioning of the mask is realized, and only the corresponding mask part needs to be precisely machined, without the need for machining a special gauge for the mask as a whole, thereby greatly reducing the machining time of the detection tool and solving the problem of the need for machining a special gauge for the mask as a whole during manual detection of different types of masks.

[0054] As shown in Figure 3 and Figure 4 In an embodiment, the positioning groove 34 precisely matches the local grid structure in the middle of the mask 6 to be detected, and the mask 6 to be detected is placed in the corresponding part of the positioning groove 34, so that the overall precise positioning of the mask 6 is realized. If the mask 6 cannot be placed in the positioning groove 34 or the overall deviation occurs in the identification, it can be judged that the positioning part of the mask 6 is unqualified; if the mask 6 is correctly placed in the positioning groove 34 and the overall deviation of the mask 6 is not large, normal detection can be carried out and the deviation data can be calculated.

[0055] Preferably, the fourth light-emitting plate 44 is arranged opposite to the first light-emitting plate 41, and the fourth light-emitting plate 44 and the first light-emitting plate 41 are arranged on both sides of the positioning jig 3, and the illumination directions of the fourth light-emitting plate 44 and the first light-emitting plate 41 are arranged opposite to each other.

[0056] By increasing the fourth light-emitting plate 44 arranged opposite to the first light-emitting plate 41 and cooperating with the second light-emitting plate 42 and the third light-emitting plate 43, the overall uniform illumination of the mask 6 is ensured, and the detection accuracy is improved.

[0057] In specific embodiments, the first light-emitting plate 41 and the fourth light-emitting plate 44 are arranged horizontally, because the operator needs to observe from the horizontal direction during detection, and the problem of the operator's observation of the mask 6 to be detected being unable to avoid being directly illuminated by the light source assembly 4 and the light source assembly 4 being too dazzling to affect manual observation is solved.

[0058] Preferably, the fourth light-emitting plate 44 is arranged between the first camera 51 and the positioning jig 3, the fourth light-emitting plate 44 is provided with a second through hole 441 in the Z direction, and the identification direction of the first camera 51 passes through the second through hole 441.

[0059] With this structure, the problem of the first camera 51 being located in front of the fourth light-emitting plate 44 and affecting illumination is avoided.

[0060] In an embodiment, the shooting assembly is installed on the support through a fixing table.

[0061] Preferably, it also includes a gimbal, and the shooting component is fixed to the bracket 1 by the gimbal.

[0062] In a preferred embodiment, the angle of the shooting component can be easily adjusted via a gimbal, facilitating the installation and adjustment of the shooting component.

[0063] In a specific embodiment, the bracket 1 is provided with a top beam and several columns. The top beam and columns are provided with positioning grooves along the length direction. The shooting component is movably installed in the positioning groove via a fixed platform or a pan-tilt unit. Matching bolts and nuts are provided between the fixed platform and the pan-tilt unit and the positioning groove to lock the fixed platform or pan-tilt unit in the position of the positioning groove. When the fixed platform or pan-tilt unit needs to be adjusted in installation position, the corresponding locking bolts and nuts can be loosened to adjust the position along the positioning groove.

[0064] Preferably, it also includes a supplementary camera and a supplementary light, wherein the supplementary camera is used to supplement the identification direction and the supplementary light is used to supplement the illumination direction.

[0065] In a specific embodiment, the mask 6 under test is provided with an open inner cavity. When the mask 6 is placed on the positioning fixture 3, there is an area in the inner cavity of the mask 6 that cannot be identified by the first camera 51, the second camera 52 and the third camera 53. By adding supplementary cameras and supplementary lighting, it is convenient to detect the inner cavity of the mask 6.

[0066] A face mask detection device includes a housing 7, a stand 8, a light-blocking curtain, and the aforementioned face mask detection unit; the stand 8 is disposed inside the housing 7, the face mask detection unit is disposed on the stand 8, the housing 7 is provided with an observation window 71, and the light-blocking curtain is disposed on the observation window 71.

[0067] like Figure 5 As shown, the mask detection device is equipped with an observation window 71 for easy manual observation and operation. During detection, a light-blocking curtain is used to prevent the detection unit from being affected by external light sources, thereby improving detection accuracy.

[0068] Other configurations and operations according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0069] In this specification, the terms "embodiment," "example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0070] Although the embodiments of the utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. A mask detection unit, characterized in that: Includes a bracket, computer module, positioning fixture, light source assembly, and shooting assembly; The light source assembly and the imaging assembly are disposed on the bracket, the illumination direction of the light source assembly and the recognition direction of the imaging assembly are arranged opposite to each other, and the positioning fixture is disposed between the light source assembly and the imaging assembly; The computer module is electrically connected to the light source assembly and the imaging assembly, and the positioning fixture is used to fix the mask being tested. The shooting assembly includes a first camera, a second camera, and a third camera. The light source assembly includes a first light-emitting plate, a second light-emitting plate, and a third light-emitting plate. The recognition direction of the first camera and the illumination direction of the first light-emitting plate are arranged opposite each other along the Z direction. The recognition direction of the second camera and the illumination direction of the second light-emitting plate are arranged along the Y direction. The recognition direction of the third camera and the illumination direction of the third light-emitting plate are arranged along the X direction.

2. The mask detection unit according to claim 1, characterized in that: The X, Y, and Z directions are perpendicular to each other.

3. The mask detection unit according to claim 1, characterized in that: The first light-emitting plate is arranged along the XY plane, and the first light-emitting plate is provided with a first through hole along the Z direction. The positioning fixture passes through the first through hole.

4. The mask detection unit according to claim 3, characterized in that: The bracket includes a horizontally arranged bottom beam. The positioning fixture includes a base, a mounting block, and a positioning block. The base is connected to the bottom beam and is located between the first light-emitting plate and the bottom beam. The mounting block passes through the first through hole. One end of the mounting block is connected to the base, and the other end of the mounting block is connected to the positioning block. The positioning block is used to position and install the mask to be tested.

5. The mask detection unit according to claim 4, characterized in that: The top of the positioning block is provided with a positioning groove, which is used to position and install the mask to be tested.

6. The mask detection unit according to claim 1, characterized in that: It also includes a fourth light-emitting plate, which is arranged opposite to the first light-emitting plate. The fourth light-emitting plate and the first light-emitting plate are arranged on both sides of the positioning fixture, and the lighting directions of the fourth light-emitting plate and the first light-emitting plate are opposite to each other.

7. A mask detection unit according to claim 6, characterized in that: The fourth light-emitting plate is disposed between the first camera and the positioning fixture. The fourth light-emitting plate has a second through hole along the Z direction, and the recognition direction of the first camera passes through the second through hole.

8. The mask detection unit according to claim 1, characterized in that: It also includes a gimbal, through which the shooting component is fixed to the bracket.

9. A mask detection unit according to claim 1, characterized in that: It also includes a supplementary camera and a supplementary light, wherein the supplementary camera is used to supplement the identification direction and the supplementary light is used to supplement the illumination direction.

10. A mask detection device, characterized in that: The device includes a housing, a stand, a light-blocking curtain, and a mask detection unit as described in any one of claims 1-9; the stand is disposed inside the housing, the mask detection unit is disposed on the stand, the housing is provided with an observation window, and the light-blocking curtain is disposed on the observation window.

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