Backlight detection jig

Abstract

The utility model belongs to the technical field of detection jigs, and particularly relates to a backlight detection jig. A backlight detection jig comprises a working table, a supporting frame, a camera arranged on the supporting frame and a Y-direction linear module arranged on the working table, and further comprises a detection jig body. The detection jig comprises a bottom plate arranged on the Y-direction linear module, a vertical plate arranged on the bottom plate, a positioning plate arranged on the vertical plate, a light source assembly arranged below the positioning plate, positioning blocks arranged at the two ends of the positioning plate, and a plurality of groups of positioning columns arranged on the positioning plate. The air cylinder is arranged on the bottom plate; the pressing claw assembly is arranged on a guide rod of the air cylinder; and a light-transmitting through groove is formed in the positioning plate corresponding to the to-be-detected part of the product. According to the utility model, batch high-precision detection can be carried out on the external length and width of a long-strip-shaped product, and the detection efficiency is high.

Description

Technical Field

[0001] This utility model belongs to the field of testing fixture technology, and in particular relates to a backlight testing fixture. Background Technology

[0002] like Figure 7 As shown, product 1 is a mobile phone hinge-type hardware component, which is long and thin. Accurate measurement of its external length and width is crucial for ensuring product quality during the manufacturing process of product 1. Currently, traditional inspection methods mostly rely on manual measurement or the use of two-dimensional measurement equipment. Manual measurement is not only inefficient and unable to meet the needs of mass production in modern mobile phone manufacturing, but it is also greatly affected by human factors, making it difficult to guarantee the accuracy and consistency of measurement results. Existing two-dimensional measurement equipment, such as two-dimensional measuring instruments, is mainly used for two-dimensional plane inspection of thinner products (such as spring clips) and smaller products, or two-dimensional projection inspection of other workpieces. In operation, the product to be inspected is generally placed on a testing fixture, and then the optical image measuring device such as the camera of the two-dimensional measuring instrument takes a picture of the product, and the precise dimensions of the product are obtained after image recognition and calculation. Related prior art is exemplified by Chinese Utility Model Patent Application No. 201922490853.9, entitled "A High-Precision Two-Dimensional Measuring Instrument".

[0003] While 2D measuring instruments improve inspection accuracy to some extent, they have shortcomings in inspection efficiency. For example, when placing product 1 on the inspection fixture, its long and thin shape makes positioning difficult, limiting overall inspection efficiency. Furthermore, for products like product 1 with extremely high dimensional accuracy requirements, when measuring longer dimensions using a single image capture, the 2D measuring instrument's camera needs to be at a considerable distance from product 1, leading to reduced overall measurement accuracy and failing to meet high-precision quality control requirements. Therefore, there is an urgent need for a fixture that can improve inspection efficiency, ensure measurement accuracy, and is suitable for mass production of mobile phone hinge-type hardware products for measuring their external length and width. Utility Model Content

[0004] To address the technical problems existing in the prior art, this application provides a backlight inspection fixture that can perform high-precision batch inspection of the outer length and width of long strip-shaped products with high inspection efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A backlight inspection fixture includes a worktable, a support frame mounted on the worktable, a camera mounted on the support frame, and a Y-axis linear module mounted on the worktable. The fixture also includes an inspection fixture comprising a base plate fixedly connected to a sliding component of the Y-axis linear module, a vertical plate mounted on the base plate, a positioning plate fixedly connected to the upper end of the vertical plate, a light source assembly mounted below the positioning plate, positioning blocks mounted at both ends of the positioning plate, multiple sets of positioning posts mounted on the positioning plate between two positioning blocks, a cylinder mounted on the base plate, and a pressure claw assembly mounted on the guide rod of the cylinder. A light-transmitting groove is formed on the positioning plate corresponding to the area of ​​the product to be inspected, allowing the product to be placed between each set of positioning posts and two positioning blocks. The pressure claw assembly can press the product.

[0007] Preferably, the pressure claw assembly includes a pressure plate fixed on the guide rod of the cylinder and a pressing post disposed on the pressure plate.

[0008] Preferably, the pressure plate has a U-shaped structure, and the two pressing posts are respectively disposed at both ends of the pressure plate.

[0009] Preferably, the crimping post is slidably and vertically inserted into the pressure plate, a limit rod is fixedly connected to the crimping post above the pressure plate, and a buffer spring is sleeved on the crimping post between the limit rod and the upper surface of the pressure plate.

[0010] Preferably, a buffer sleeve is fitted at the lower end of the crimping post.

[0011] Preferably, guide ramps are provided on the opposite end faces of the two positioning blocks.

[0012] Preferably, a clearance groove is provided in the middle of the upper surface of the positioning plate, and a support block is provided in the clearance groove.

[0013] Preferably, two sets of Y-axis linear modules are arranged in parallel, two sets of detection fixtures are arranged correspondingly, an X-axis linear module is arranged on the support frame, and the camera is arranged on the sliding part of the X-axis linear module.

[0014] Preferably, a Z-axis linear module is provided on the sliding member of the X-axis linear module, and the camera is fixedly connected to the sliding member of the Z-axis linear module.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention utilizes a positioning block, positioning column, cylinder, and pressure claw assembly to quickly position and fix products for inspection. A light source assembly and light-transmitting slots enhance camera image clarity and improve inspection accuracy. A Y-axis linear module drives the inspection fixture along the Y-axis, allowing the camera to measure the width of the product at multiple locations and the distance between the product's ends and the inner side of the positioning block. Compared to existing single-photo measurement methods, this invention calculates the product's width and length through multiple measurements and by measuring the gaps between the product's ends and the positioning reference (i.e., the inner end face of the positioning block). This inspection method offers advantages such as high accuracy and efficiency. The entire inspection process is highly automated; operators only need to place the product on the fixture, and subsequent inspection is completed automatically by the equipment, reducing manual intervention, operational difficulty, and the impact of human factors on the inspection results.

[0017] By setting up a U-shaped pressure plate and two pressing posts, the stability and uniformity of force distribution when the product is fixed are improved; by setting up a buffer spring, the product is prevented from being crushed by the pressing posts.

[0018] By setting guide ramps and clearance grooves, it is easy for manual placement of products inside the positioning blocks and positioning columns.

[0019] By setting up two sets of Y-axis linear modules and inspection fixtures, and placing the camera on the X-axis linear module, dual-station automatic inspection is achieved. When a product is being inspected on one side of the inspection fixture, another product can be placed on the other side of the inspection fixture, thereby improving the overall inspection efficiency.

[0020] By setting the Z-axis linear module, the distance between the camera and the product can be adjusted as needed to achieve the best detection effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0022] Figure 2 This is a three-dimensional structural diagram of the testing fixture of this utility model.

[0023] Figure 3 This is a top view of the testing fixture of this utility model.

[0024] Figure 4 for Figure 3 A magnified structural diagram at point A.

[0025] Figure 5 This is a schematic diagram of the connection structure of the cylinder and pressure claw assembly of this utility model.

[0026] Figure 6This is a schematic diagram of the connection structure of the base plate, upright plate, positioning plate, positioning block and positioning column of this utility model.

[0027] Figure 7 This is a schematic diagram of the structure of a product that is tested using this invention.

[0028] In the diagram: 11. Product; 12. Position 1; 13. Position 2; 14. Position 4; 15. Position 5; 16. Position 6; 17. Position 7; 18. Detection gap.

[0029] 2. Workbench; 3. Y-axis linear module.

[0030] 4. Inspection fixture; 41. Base plate; 42. Vertical plate; 43. Positioning plate; 431. Light-transmitting slot; 432. Clearance slot; 433. Support block; 44. Light source assembly; 45. Positioning block; 451. Guide slope; 46. Positioning post; 47. Cylinder; 48. Claw assembly; 481. Pressure plate; 482. Crimping post; 483. Limiting rod; 484. Buffer spring; 485. Buffer sleeve.

[0031] 5. Support frame, 51. Support plate, 52. Crossbeam,

[0032] 6. Camera, 7. X-axis linear module, 8. Z-axis linear module, 9. Detection system. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0034] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Example

[0035] See appendix Figure 1 As shown, a backlight testing fixture includes a worktable 2, a Y-axis linear module 3 disposed on the worktable 2, a testing fixture 4 disposed on the Y-axis linear module 3, a support frame 5 disposed on the worktable 2, and a camera 6 disposed on the support frame 5.

[0036] The Y-axis linear module 3 is used to support the inspection fixture 4 and enable the inspection fixture 4 to move back and forth in the Y direction, so as to cooperate with the camera 6 to take pictures of the product 1 at different positions and measure the dimensions at different positions. The Y-axis linear module 3 can be an existing ball screw linear module driven by a servo motor. It should be noted that in this embodiment, the X-axis is along the length direction of the worktable 2, the Y-axis is along the width direction of the worktable 2, that is, the direction in which the Y-axis linear module 3 drives the inspection fixture 4, and the Z-axis is the vertical direction, which can be referred to as... Figure 1 The annotations for the specific X, Y, and Z directions.

[0037] Furthermore, in order to simultaneously inspect the product 1 on one inspection fixture 4 and position and fix the product 1 on another inspection fixture 4, thereby improving the overall inspection efficiency, in this embodiment, two sets of Y-direction linear modules 3 are arranged in parallel, and two sets of inspection fixtures 4 and Y-direction linear modules 3 are correspondingly arranged.

[0038] See Figure 2 , 3 As shown in Figure 4, specifically, the testing fixture 4 includes a base plate 41, a vertical plate 42, a positioning plate 43, a light source assembly 44, a positioning block 45, a positioning column 46, a cylinder 47, and a pressure claw assembly 48.

[0039] The base plate 41 is bolted to the sliding component of the Y-axis linear module 3. Two vertically arranged upright plates 42 are bolted to the upper surface of the base plate 41. The positioning plate 43 is bolted to the upper surface of the upright plates 42. Two positioning blocks 45 are bolted to both sides of the upper surface of the positioning plate 43. Guide slopes 451 are provided on the opposite end faces of the two positioning blocks 45. The guide slopes 451 are set in an upward direction to facilitate the guidance of the product 1 when it is placed between the two positioning blocks 45.

[0040] It should be noted that the distance between the opposite end faces of the two positioning blocks 45 can be set according to the length of the product 1, and the opposite end faces of the two positioning blocks 45 are precision machined. The distance between the opposite end faces of the two positioning blocks 45 is used as a standard value. When the length of the product 1 is detected, the gap between the outer end faces of both ends of the product 1 and the opposite end faces of the two positioning blocks 45 is identified by taking pictures. The length of the product 1 is obtained by subtracting the gap from the standard value.

[0041] In order to position product 1, multiple sets of positioning posts 5 are vertically fixedly inserted on the positioning plate 43 between the two positioning blocks 45. In this embodiment, four sets of positioning posts 5 are arranged along the length of the positioning plate 43, and two positioning posts 5 are arranged opposite each other in each set.

[0042] To improve the clarity of photographs taken at multiple locations, including both ends and the middle of product 1, a light-transmitting slot 431 is provided on the positioning plate 43 corresponding to the area of ​​product 1 to be inspected. An existing light source assembly 44 is installed below the positioning plate 43, employing bottom lighting to provide a uniform and stable light source for photographing product 1. This ensures that product 1 presents a clear external outline under the camera 6, facilitating subsequent dimensional measurements. (See also...) Figure 3 and Figure 7 As shown, photos are taken of product 1 at seven locations: positions 11 and 12 at both ends of product 1, and positions 13, 14, 15, 16, and 17 in the middle of product 1. Therefore, seven light-transmitting slots 431 are correspondingly provided at positions 11, 12, 13, 14, 15, 16, and 17. This ensures that when product 1 is placed between the two positioning blocks 45, the seven light-transmitting slots 431 correspond one-to-one with the seven photo positions of product 1, and the light generated by the light source component 44 illuminates the edges of the light-transmitting slots 431 through them.

[0043] Furthermore, a clearance groove 432 is provided in the middle of the upper surface of the positioning plate 43, and a support block 433 is provided in the clearance groove 432. The width of the support block 433 is smaller than the width of the positioning plate 43. By providing the clearance groove 432, it is easier for the worker to hold the product 1 and place it between the two positioning posts 46. By providing the support block 433, further support is provided for the product 1, preventing deformation of the product 1 when the pressure claw assembly 48 fixes the product 1.

[0044] See Figure 2 , 5 As shown, cylinder 47 is fixedly installed on the upper surface of base plate 41 on one side of positioning block 45. In this embodiment, two cylinders 47 are provided, and a pressure claw assembly 48 is provided on the guide rod of cylinder 47. Specifically, the pressure claw assembly 48 includes a pressure plate 481 fixedly sleeved on the guide rod of cylinder 47 and a pressing post 482 provided on the pressure plate 481. The pressure plate 481 has a U-shaped structure, and the two pressing posts 482 are respectively provided at both ends of the pressure plate 481. The pressing post 482 is slidably vertically inserted into the pressure plate 481. A limit rod 483 is horizontally fixedly connected to the pressing post 482 above the pressure plate 481. A buffer spring 484 is sleeved on the pressing post 482 between the limit rod 483 and the upper surface of the pressure plate 481. A buffer sleeve 485 is sleeved on the lower end of the pressing post 482. By setting a buffer spring 484 and a buffer sleeve 485, buffering is provided when the cylinder 47 drives the pressing column 482 to press the product 1, so as to avoid damaging the product 1.

[0045] Furthermore, cylinder 47 can be an existing rotary pressing cylinder. In its initial state, cylinder 47's guide rod extends, and the pressure plate 481 and pressing post 482 rotate to one side of product 1, preventing the pressing claw assembly 48 from obstructing product 1 when it is placed between the two positioning blocks 45. After product 1 is placed between the two positioning blocks 45 and the positioning post 46, cylinder 47 actuates, its guide rod retracts, and drives the pressure plate 481 and pressing post 482 to rotate above product 1, pressing the pressing post 482 to hold product 1 in place. This ensures product 1 adheres to the positioning plate 43 without wobbling, guaranteeing the stability of product 1's position during testing.

[0046] See Figure 1 As shown, the support frame 5 includes support plates 51 vertically fixed to both sides of the workbench 2 by bolts, and horizontal beams 52 horizontally fixedly installed on the two support plates 51. To enable the inspection of products 1 on the inspection fixtures 4 of the two Y-axis linear modules 3, in this embodiment, an X-axis linear module 7 is fixedly installed on the support plate 51, and a camera 6 is mounted on a sliding component of the X-axis linear module 7. Furthermore, to facilitate adjustment of the distance between the camera 6 and the product 1, a Z-axis linear module 8 is fixedly installed on the sliding component of the X-axis linear module 7, and the camera 6 is fixedly connected to the sliding component of the Z-axis linear module 8.

[0047] In addition, this utility model also includes an existing detection system 9, which is connected to the camera 6, receives image information captured by the camera 6, processes and analyzes the images, thereby calculating the external length and width dimensions of the product 1, and displays the measurement results on a computer screen.

[0048] The working principle and process of this embodiment are as follows:

[0049] When the outer length and width of product 1 are measured, product 1 is first placed between the two positioning blocks 45 and the positioning column 46 on the measuring fixture 4. The cylinder 47 is activated, driving the pressing column 482 to press product 1, so that it fits tightly against the upper surface of the positioning plate 43 and does not wobble. Then, the light source of the light source assembly 44 shines light from the bottom plate of the positioning plate 43. The light shines through the light-transmitting groove 431 to illuminate the seven photo positions of product 1 to be measured, obtaining the clear outer contour of product 1. The Y-direction linear module 3 drives the measuring fixture 4 to move along the Y direction, and the camera 6 takes multiple photos directly above product 1 to obtain the seven photo positions of product 1 to be measured.

[0050] See Figure 3 , 4 As shown, in this embodiment, since the width of product 1 is small, the width of the corresponding position of product 1 can be directly calculated from the single imaging result, that is, by taking a single picture of position three 13, position four 14, position five 15, position six 16 and position seven 17 in the middle of product 1.

[0051] Because product 1 is relatively long, camera 6 takes photos of both ends of product 1 from a small area, specifically by taking photos of position 11 and position 12 at both ends of product 1. Using the actual length between the opposite end faces of the two positioning blocks 45 as a standard value, the detection gap 18 between the two ends of product 1 and the corresponding end faces of the positioning blocks 45 is calculated by taking photos. By subtracting the detection gap 18 from the standard value, the total length of product 1 can be calculated.

[0052] Finally, the inspection system processes and analyzes the images captured by camera 6, determines the pixel size by comparing them with existing standard parts, calculates the external length and width of product 1, and displays the measurement results on the computer screen, thus completing the entire inspection process.

[0053] While product 1 is being photographed and inspected on one side of the inspection fixture 4, the operator can place another product 1 on the other side of the inspection fixture 4, thus achieving dual-station inspection and improving inspection efficiency. After the inspection of product 1 on one side is completed, the Y-axis linear module on that side drives the inspection fixture 4 to move product 1 to the operator. The cylinder 47 is activated, driving the pressing column 482 to detach from product 1 for unloading. The X-axis linear module 7 drives the camera 6 to move to the other side, and the Y-axis linear module on the other side drives the inspection fixture 4 on that side to move product 1 below the camera 6 for inspection. By repeating the above process, batch inspection of product 1 can be achieved.

[0054] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A backlight detection fixture, comprising a worktable, a support frame disposed on the worktable, a camera disposed on the support frame, and a Y-axis linear module disposed on the worktable, characterized in that: It also includes a testing fixture, which includes a base plate fixedly connected to the sliding component of the Y-direction linear module, a vertical plate provided on the base plate, a positioning plate fixedly connected to the upper end of the vertical plate, a light source assembly provided below the positioning plate, positioning blocks provided at both ends of the positioning plate, multiple sets of positioning columns provided on the positioning plate between the two positioning blocks, a cylinder provided on the base plate, and a pressure claw assembly provided on the guide rod of the cylinder. A light-transmitting groove is provided on the positioning plate corresponding to the part of the product to be inspected. The product can be placed between each set of positioning posts and two positioning blocks. The pressure claw assembly can press the product.

2. The backlight detection fixture according to claim 1, characterized in that: The pressure claw assembly includes a pressure plate fixed on the guide rod of the cylinder and a pressing post disposed on the pressure plate.

3. The backlight detection fixture according to claim 2, characterized in that: The pressure plate has a U-shaped structure, and the two pressing posts are respectively located at both ends of the pressure plate.

4. The backlight detection fixture according to claim 3, characterized in that: The crimping post is slidably and vertically inserted into the pressure plate. A limit rod is fixedly connected to the crimping post above the pressure plate, and a buffer spring is sleeved on the crimping post between the limit rod and the upper surface of the pressure plate.

5. The backlight detection fixture according to claim 4, characterized in that: A buffer sleeve is fitted at the lower end of the crimping post.

6. The backlight detection fixture according to claim 1, characterized in that: Guide slopes are provided on the opposite end faces of the two positioning blocks.

7. The backlight detection fixture according to claim 1, characterized in that: An clearance groove is provided in the middle of the upper surface of the positioning plate, and a support block is provided in the clearance groove.

8. A backlight detection fixture according to any one of claims 1-7, characterized in that: Two sets of Y-axis linear modules are arranged in parallel, and two sets of detection fixtures are arranged accordingly. An X-axis linear module is arranged on the support frame, and the camera is arranged on the sliding part of the X-axis linear module.

9. The backlight detection fixture according to claim 8, characterized in that: A Z-axis linear module is provided on the sliding component of the X-axis linear module, and the camera is fixedly connected to the sliding component of the Z-axis linear module.

Images