Display rear cover screw locking device

Abstract

The invention discloses a display rear cover screw locking device which comprises a workbench, a screw locking mounting mechanism is arranged on one side of the upper end of the workbench, a display screen adsorption clamping table is arranged on one side of the screw locking mounting mechanism, and display screen longitudinal pressing devices are arranged on the two sides of the display screen adsorption clamping table. A screw inspection device is arranged on one side of the display screen adsorption clamping table and located at the right lower end of the screw locking mounting mechanism, and an after-screw-assembly inspection device is arranged at the opposite end of the display screen adsorption clamping table; the workbench comprises a four-corner supporting frame, a bearing panel is arranged at the upper end of the four-corner supporting frame, a receding groove is formed in the center of the bearing panel, and a screw progressive machine is arranged on one side of the bearing panel. The product has the advantages that the whole-process closed-loop quality control is realized, the product consistency is obviously improved, a complete quality control closed loop is constructed through a triple inspection mechanism of detection before screw taking, positioning in locking and reinspection after locking, and the assembly quality consistency of the rear cover of the display is greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of display screens, and particularly relates to a screw locking device for the rear cover of a display. Background Art

[0002] With the increasing development of electronic products, the production process of displays has gradually become automated. Especially in the screw locking process of the rear cover of a display, traditional manual operations often face problems such as low efficiency, large errors, and high defect rates. Therefore, developing a device that can automate the entire screw locking process is of great significance for improving production efficiency, reducing manual intervention, and enhancing product yield.

[0003] Chinese Patent 201820234137.7 only realizes mechanical positioning. However, in this solution, through visual pre-inspection before material taking (eliminating NG screws) and three-dimensional visual re-inspection after locking (detecting hidden defects such as floating locks and tilts), a complete quality control chain is constructed, and the defect rate is greatly reduced. It breaks through the traditional open-loop mode of "positioning + locking". The spiral distance adjustment mechanism (minimum adjustment amount 0.005mm) cooperates with the dynamic backlight source to dynamically optimize the detection parameters for different screw specifications (such as stainless steel and aluminum alloy), and the detection accuracy rate reaches 99.8%. In contrast, the comparative patent does not involve the adaptive adjustment of the vision system and may be misjudged due to screw reflection and size differences. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems that in the process of manual operation, due to the influence of human factors, the screw locking process often takes a long time and is prone to errors. During the screw locking process, the docking of the screw with the display component is not precise, which easily causes screw deviation or unstable installation, affecting the appearance and use effect of the display. Most existing screw locking devices lack an effective quality detection mechanism, resulting in some products with unqualified screws or incorrect installations entering the next production link.

[0005] The present invention achieves the above object through the following technical solutions: A screw locking device for the rear cover of a display, comprising a workbench. On one side of the upper end of the workbench, there is a screw locking and mounting mechanism. On one side of the screw locking and mounting mechanism, there is a display adsorption and clamping table. On both sides of the display adsorption and clamping table, there are display longitudinal pressing devices. On one side of the display adsorption and clamping table, directly below the screw locking and mounting mechanism, there is a screw inspection device. On the opposite end of the display adsorption and clamping table, there is a screw inspection device after assembly. The workbench includes four-corner support frames. On the upper end of the four-corner support frames, there is a load-bearing panel. At the central position of the load-bearing panel, there is an avoidance groove. On one side of the load-bearing panel, there is a screw feeder. The modular layout realizes the full automation of the screw locking process, greatly improving the production efficiency. The design of the avoidance groove provides space for the bottom detection mechanism to realize the pre-detection before screw picking, avoiding defective products from entering the locking process and improving the product yield.

[0006] Further, the screw locking and mounting mechanism includes a support frame. On one side of the upper end of the support frame, there is a Y-direction screw motor moving device. On both sides of the upper end of the support frame, there are first slide rail and slider moving devices. On the first slide rail and slider moving devices, there is a crossbeam panel. On one side of the crossbeam panel, there is a first X-direction screw motor moving device. On one side of the upper end of the crossbeam panel, there is a second slide rail and slider moving device. The first X-direction screw motor moving device is fixedly connected to a Z-direction screw motor moving device. On the Z-direction screw motor moving device, there is a vision capture lens. Adjacent to one side of the vision capture lens, there is an electric screw locking device. The electric screw locking device is assembled with the screw feeder to pick up the screws on the screw feeder through three-directional movement. The three-directional screw motor drive system realizes millimeter-level precision positioning (repeat positioning accuracy ±0.02 mm), and cooperates with the vision capture lens to realize the automatic recognition and alignment of the screw holes. The efficiency is increased by more than 50% compared with the traditional manual alignment, and the problem of locking offset caused by human error is avoided.

[0007] Further, the display adsorption and clamping table includes a fixed support plate. On the upper end of the fixed support plate, there is a clamping device. The clamping device includes a bottom plate. On the bottom plate, there is a quick-change load-bearing plate for replacing displays of different sizes. On the quick-change load-bearing plate, there are several suction cups. On the quick-change load-bearing plate, there is a display. The quick-change load-bearing plate is designed to support the tooling change of displays of different sizes (such as 10 - 75 inches) within five minutes, significantly shortening the changeover time. The suction cups provide uniform adsorption force to prevent the thin-walled display from deforming during the locking process.

[0008] Furthermore, the longitudinal pressing device for the display screen includes support legs. An X-direction cylinder driving member is provided at the upper end of the support legs. A Z-direction micro screw rod motor moving device is provided at the output end of the X-direction cylinder driving member. A Y-direction cylinder driving member is provided at one side end of the Z-direction micro screw rod motor moving device. An L-shaped connecting block is provided at the output end of the Y-direction cylinder driving member. A Z-direction cylinder driving member is provided at one side end of the L-shaped connecting block. A pressing head is provided at the lower end of the Z-direction cylinder driving member. The lifting of the screw rod motor can accurately adjust the height and can be adjusted according to the thickness of different display screens. The pressure of the pressing head can be accurately controlled, avoiding the problem of glass fragmentation caused by traditional rigid pressing. At the same time, accurate positioning of the special-shaped frame is realized, and the locking stability is improved.

[0009] Furthermore, the screw inspection device includes an L-shaped fixed back plate. A second X-direction screw rod motor moving device is provided at one side of the lower end of the L-shaped fixed back plate. A third slide rail slider moving device is provided at the upper end of the second X-direction screw rod motor moving device. A vision inspection device is provided at one side of the second X-direction screw rod motor moving device. The vision inspection device driven by the screw rod motor can achieve a detection accuracy of ±0.01 mm, and can conduct a full inspection on the head size, thread integrity, etc. of the screws, and the missed inspection rate is less than 0.1%. Detection is carried out from the bottom through the avoidance groove, avoiding additional space occupation and maintaining the compactness of the production line.

[0010] Furthermore, the vision inspection device includes a fixed back plate. A second vision capture lens is provided on one side of the fixed back plate. A first XYZ three-direction spiral distance adjustment mechanism is provided at the lower end of the second vision capture lens. A horizontal and vertical spiral distance adjustment mechanism is provided at the adjacent side of the first XYZ three-direction spiral distance adjustment mechanism. A first backlight is provided at the upper end of the horizontal and vertical spiral distance adjustment mechanism. The spiral distance adjustment mechanism provides a sub-millimeter-level fine adjustment accuracy (the minimum adjustment amount is 0.005 mm), and can optimize the lens depth of field and the light source angle for different specifications of screws (such as M1.5 - M5) to improve the image clarity. The backlight eliminates the reflection interference, and the detection accuracy of the surface defects (such as cracks and deformations) of the screws reaches 99.8%.

[0011] Furthermore, the inspection device for the assembled screws includes a third X-direction screw rod motor moving device. A fixed plate is provided on the third X-direction screw rod motor moving device. A second XYZ three-direction spiral distance adjustment mechanism is provided on the fixed plate. A third vision capture lens is provided on one side of the second XYZ three-direction spiral distance adjustment mechanism. A third XYZ three-direction spiral distance adjustment mechanism is provided on the other side of the fixed plate. A second backlight is provided on the third XYZ three-direction spiral distance adjustment mechanism. By dynamically adjusting the positions of the lens and the light source through the spiral distance adjustment mechanism, three-dimensional detection of the locked screws can be realized, and the protruding height and inclination of the screws can be measured, and defects such as missed locking and floating locking can be automatically identified to ensure that each screw meets the process standards and reduce the cost of manual re-inspection.

[0012] Furthermore, the screw inspection device is fixed to the bottom of the workbench. Through the avoidance groove, the vision inspection device is used to take pictures and compare the screws on the electric screw locking device, excluding NG materials. The bottom detection layout avoids occupying extra space, realizing seamless connection of "material taking - detection - locking". The detection beat is ≤ 0.5 seconds, without affecting the overall production efficiency. By comparing with a preset standard template, defective screws such as those with oversized dimensions or damaged threads can be automatically removed, preventing defective products from flowing into subsequent processes.

[0013] Furthermore, the post - assembly screw inspection device is flush with the display screen adsorption clamping table and can simultaneously perform lateral movement to individually inspect the height of the screws on the assembled display screen. The flush design ensures unobstructed detection vision, and the lateral scanning speed reaches 300 mm / s. The detection time for a single screw is < 0.3 seconds. Through height detection, floating lock problems caused by insufficient torque can be discovered, and the detection system automatically records the defective positions, facilitating traceability and quality improvement.

[0014] Furthermore, the first XYZ three - axis screw distance - adjusting mechanism, the horizontal and vertical screw distance - adjusting mechanism, the second XYZ three - axis screw distance - adjusting mechanism, and the third XYZ three - axis screw distance - adjusting mechanism are all finely adjusted through a screw adjustment structure to adjust the distance between the lens and the light source to reach the optimal distance. The screw fine - adjustment mechanism provides an adjustment accuracy of ±0.005 mm, and can optimize imaging parameters for screws with different reflection characteristics (such as stainless steel and aluminum alloy), enabling the vision system to maintain a detection accuracy of > 99% under different working conditions. The mechanism has a compact structure, does not require complex calibration, and significantly reduces the debugging time and technical threshold.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. Full - process closed - loop quality control, significantly improving product consistency: The device constructs a complete quality control closed - loop through a triple - inspection mechanism of pre - screw - taking detection, in - locking positioning, and post - locking re - inspection. Before taking the screws, the bottom vision inspection device is used to screen NG screws with an accuracy of ±0.01 mm. During locking, precise positioning is achieved by relying on the three - axis lead screw motor and vision capture. After locking, problems such as missed locking and floating lock are identified through three - dimensional detection, reducing the defective rate of screw locking and ensuring that the product meets the process standards, greatly improving the assembly quality consistency of the display back cover. 2. High-efficiency flexible production, adapting to diverse product requirements: The combination of the quick-change carrier plate and the multi-degree-of-freedom display longitudinal pressing device enables the equipment to complete the quick changeover of displays of different sizes (10 - 75 inches) within 5 minutes. Moreover, the display longitudinal pressing device can precisely adjust the height and pressure of the pressing head through a screw motor, adapting to displays in various forms such as flat and curved surfaces, realizing seamless switching of the small-batch, multi-variety production mode. The production efficiency is greatly improved compared with traditional fixed tooling equipment, effectively reducing the enterprise's equipment investment cost; 3. Precise motion control and vision collaboration, breaking through the bottleneck of traditional assembly accuracy: The three-way screw motor drive system and the sub-millimeter-level spiral pitch adjustment mechanism (minimum adjustment amount 0.005mm) work together, not only achieving high-precision automatic alignment of screw holes, but also dynamically optimizing visual inspection parameters according to the screw specifications and materials. For example, for screws with different reflective characteristics (such as stainless steel and aluminum alloy), by adjusting the distance between the lens and the light source, the detection accuracy of the vision system is always maintained at a high level, completely solving the problem of high-precision assembly that is difficult to achieve with traditional manual assembly and ordinary automated equipment; 4. Space optimization and efficient cycle design, maximizing production capacity: The innovative bottom detection layout and flush re-inspection design make full use of the space in the workbench avoidance groove, avoiding the occupation of the lateral space of the production line by the detection module, making the equipment structure more compact. At the same time, the material taking and detection cycle ≤ 0.5 seconds, and the re-inspection time for a single screw < 0.3 seconds. With the parallel operation mechanism of each mechanism, the overall production cycle is greatly compressed. Under the same site conditions, the production capacity is increased by 50% compared with traditional equipment, effectively improving the output benefit per unit area of the enterprise; 5. Intelligent operation and maintenance and data-driven, reducing the comprehensive operation cost: The high-precision sensors and detection systems integrated in the device can not only monitor the locking quality in real time, but also predict potential risks such as equipment wear (such as the decline of screw accuracy and lens deviation) and screw incoming material fluctuations through the accumulation and analysis of detection data. For example, through abnormal screw height detection data, early warning of torque parameter deviation of the electric screw locking device is realized, achieving predictive maintenance, reducing the equipment failure rate, and reducing downtime and maintenance costs; at the same time, the automatic traceability function of detection data provides data support for the optimization of production processes, further reducing the comprehensive operation cost; Brief Description of the Drawings

[0016] Figure 1 is a schematic diagram of the present invention; Figure 2 is a schematic diagram of the workbench of the present invention; Figure 3 is a schematic diagram of the screw locking and installation mechanism of the present invention; Figure 4 is a schematic diagram of the display adsorption and clamping table of the present invention; Figure 5Schematic diagram of the clamping device of the present invention; Figure 6 Schematic diagram of the longitudinal pressing device for the display screen of the present invention; Figure 7 Schematic diagram of the screw inspection device of the present invention; Figure 8 Schematic diagram of the vision inspection device of the present invention; Figure 9 Schematic diagram of the inspection device for the assembled screws of the present invention.

[0017] In the figure: 1 - workbench, 2 - screw locking and mounting mechanism, 3 - display screen adsorption and clamping table, 4 - longitudinal pressing device for the display screen, 5 - screw inspection device, 6 - inspection device for the assembled screws, 11 - four-corner support frame, 12 - bearing panel, 13 - avoidance groove, 14 - screw feeder, 21 - support frame, 22 - Y-direction screw motor moving device, 23 - first slide rail and slider moving device, 24 - cross beam panel, 25 - first X-direction screw motor moving device, 26 - second slide rail and slider moving device, 27 - Z-direction screw motor moving device, 28 - vision capture lens, 29 - electric screw locking device, 31 - fixed support plate, 32 - clamping device, 321 - bottom plate, 323 - quick-change bearing plate, 324 - suction cup, 325 - display screen, 41 - support leg, 42 - X-direction cylinder pushing member, 43 - Z-direction micro screw motor moving device, 44 - Y-direction cylinder pushing member, 45 - L-shaped connecting block, 46 - Z-direction cylinder pushing member, 47 - pressing head, 51 - L-shaped fixed back plate, 52 - second X-direction screw motor moving device, 53 - third slide rail and slider moving device, 54 - vision inspection device, 541 - fixed back plate, 542 - second vision capture lens, 543 - first XYZ three-way screw distance adjustment mechanism, 544 - horizontal and vertical screw distance adjustment mechanism, 545 - first backlight, 61 - third X-direction screw motor moving device, 62 - fixing plate, 63 - second XYZ three-way screw distance adjustment mechanism, 64 - third vision capture lens, 65 - third XYZ three-way screw distance adjustment mechanism, 66 - second backlight. Detailed implementation manners

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0019] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0020] Combined with Figure 1 As shown, a screw locking device for the back cover of a display includes a workbench 1. On one side of the upper end of the workbench 1, there is a screw locking and mounting mechanism 2. On one side of the screw locking and mounting mechanism 2, there is a display screen adsorption and clamping table 3. On both sides of the display screen adsorption and clamping table 3, there are display screen longitudinal pressing devices 4. On one side of the display screen adsorption and clamping table 3, directly below the screw locking and mounting mechanism 2, there is a screw inspection device 5. On the opposite end of the display screen adsorption and clamping table 3, there is a screw inspection device 6 after assembly; The workbench 1 includes four-corner support frames 11. On the upper end of the four-corner support frames 11, there is a bearing panel 12. At the central position of the bearing panel 12, there is an avoidance groove 13. On one side of the bearing panel 12, there is a screw feeder 14. The whole process of screw locking is automated through modular layout, greatly improving production efficiency; The design of the avoidance groove provides space for the bottom detection mechanism to realize the pre-detection before screw picking, avoiding defective products from entering the locking process and improving the product yield. Combined with Figures 2 - 9 As shown, the screw locking and mounting mechanism 2 includes a support frame 21. On one side of the upper end of the support frame 21, there is a Y-direction screw motor moving device 22. On both sides of the upper end of the support frame 21, there are first slide rail and slider moving devices 23. On the first slide rail and slider moving devices 23, there is a cross beam panel 24. On one side of the cross beam panel 24, there is a first X-direction screw motor moving device 25. On one side of the upper end of the cross beam panel 24, there is a second slide rail and slider moving device 26. Fixedly connected to the first X-direction screw motor moving device 25 is a Z-direction screw motor moving device 27. On the Z-direction screw motor moving device 27, there is a visual capture lens 28. Adjacent to one side of the visual capture lens 28, there is an electric screw locking device 29. The electric screw locking device 29 is assembled with the screw feeder 14 to pick up the screws on the screw feeder 14 through three-directional movement. The three-directional screw motor drive system realizes millimeter-level precision positioning (repeated positioning accuracy ±0.02 mm), and cooperates with the visual capture lens to realize the automatic identification and alignment of the screw holes, improving the efficiency by more than 50% compared with the traditional manual alignment, and avoiding the locking deviation problem caused by human error. The display adsorption clamping table 3 includes a fixed support plate 31. A clamping device 32 is arranged at the upper end of the fixed support plate 31. The clamping device 32 includes a bottom plate 321. A quick-change carrier plate 323 is arranged on the bottom plate 321 for replacing display screens of different sizes. A plurality of suction cups 324 are arranged on the quick-change carrier plate 323. A display screen 325 is arranged on the quick-change carrier plate 323. The quick-change carrier plate is designed to support the tooling change of display screens of different sizes (such as 10 - 75 inches) within five minutes, significantly shortening the changeover time. The suction cups provide uniform adsorption force to prevent the thin-walled display screen from deforming during the locking process. The display longitudinal pressing device 4 includes support legs 41. An X-direction cylinder pushing member 42 is arranged at the upper end of the support legs 41. A Z-direction micro screw motor moving device 43 is arranged at the output end of the X-direction cylinder pushing member 42. A Y-direction cylinder pushing member 44 is arranged at one side end of the Z-direction micro screw motor moving device 43. An L-shaped connecting block 45 is arranged at the output end of the Y-direction cylinder pushing member 44. A Z-direction cylinder pushing member 46 is arranged at one side end of the L-shaped connecting block 45. A pressing head 47 is arranged at the lower end of the Z-direction cylinder pushing member 46. The lifting of the screw motor can precisely adjust the height and adjust it according to the thickness of different display screens. The pressure of the pressing head can be precisely controlled to avoid the problem of glass cracking caused by traditional rigid pressing. At the same time, it can achieve precise positioning of the special-shaped frame and improve the locking stability. The screw inspection device 5 includes an L-shaped fixed back plate 51. A second X-direction screw motor moving device 52 is arranged at one side of the lower end of the L-shaped fixed back plate 51. A third slide rail slider moving device 53 is arranged at the upper end of the second X-direction screw motor moving device 52. A vision inspection device 54 is arranged at one side of the second X-direction screw motor moving device 52. The vision inspection device driven by the screw motor can achieve a detection accuracy of ±0.01 mm, and conduct a full inspection on the head size, thread integrity, etc. of the screws, with a missed inspection rate of less than 0.1%. It is detected from the bottom through the avoidance groove to avoid occupying extra space and keep the production line compact. The vision inspection device 54 includes a fixed back plate 541. A second vision capture lens 542 is arranged at one side of the fixed back plate 541. A first XYZ three-direction spiral distance adjustment mechanism 543 is arranged at the lower end of the second vision capture lens 542. A horizontal and vertical spiral distance adjustment mechanism 544 is arranged at the adjacent side of the first XYZ three-direction spiral distance adjustment mechanism 543. A first backlight 545 is arranged at the upper end of the horizontal and vertical spiral distance adjustment mechanism 544. The spiral distance adjustment mechanism provides a sub-millimeter-level fine adjustment accuracy (the minimum adjustment amount is 0.005 mm), and can optimize the lens depth of field and the light source angle for different specifications of screws (such as M1.5 - M5) to improve the image clarity. The backlight eliminates the reflection interference, and the detection accuracy of the surface defects (such as cracks and deformations) of the screws reaches 99.8%. The post - assembly inspection device 6 for screws includes a third X - direction screw motor moving device 61. There is a fixing plate 62 arranged on the third X - direction screw motor moving device 61. A second XYZ three - direction screw distance - adjusting mechanism 63 is arranged on the fixing plate 62. On one side of the second XYZ three - direction screw distance - adjusting mechanism 63, there is a third vision capture lens 64. On the other side of the fixing plate 62, there is a third XYZ three - direction screw distance - adjusting mechanism 65. A second backlight 66 is arranged on the third XYZ three - direction screw distance - adjusting mechanism 65. By dynamically adjusting the positions of the lens and the light source through the screw distance - adjusting mechanism, three - dimensional detection of the screws after locking is realized. It can measure the protruding height and inclination of the screws, automatically identify defects such as missed locking and floating locking, ensure that each screw meets the process standards, and reduce the cost of manual re - inspection; The screw inspection device 5 is fixed at the bottom of the workbench 1. Through the avoidance groove 13, the vision inspection device 54 is used to take pictures and compare the screws on the electric screw locking device 29, excluding NG materials. The bottom - detection layout avoids occupying extra space and realizes seamless connection of "material taking - detection - locking". The detection beat ≤ 0.5 seconds, without affecting the overall production efficiency; By comparing with a preset standard template, defective screws such as those with out - of - tolerance dimensions and damaged threads can be automatically removed, preventing defective products from flowing into subsequent processes; The post - assembly inspection device 6 for screws is flush with the display screen adsorption clamping table 3 and can simultaneously complete lateral movement to individually inspect the heights of the screws on the assembled display screen 325. The flush design ensures that the detection field of view is unobstructed. The lateral scanning speed reaches 300 mm / s, and the detection time for a single screw < 0.3 seconds; Through height detection, problems such as floating locking caused by insufficient torque can be found, and the detection system automatically records the defective positions for easy traceability and quality improvement; The first XYZ three - direction screw distance - adjusting mechanism 543, the horizontal and vertical screw distance - adjusting mechanism 544, the second XYZ three - direction screw distance - adjusting mechanism 63, and the third XYZ three - direction screw distance - adjusting mechanism 65 are all finely adjusted through the screw adjustment structure to adjust the distance between the lens and the light source to reach the optimal distance. The screw fine - adjustment mechanism provides an adjustment accuracy of ±0.005 mm, and can optimize the imaging parameters for screws with different reflection characteristics (such as stainless steel and aluminum alloy), enabling the vision system to maintain a detection accuracy of > 99% under different working conditions; The mechanism structure is compact, without complex calibration, significantly reducing the debugging time and technical threshold.

[0021] During operation, the screw feeder 14 arranges and conveys the screws in an orderly manner to the picking position through a vibrating or spiral feeding mechanism. Driven by the Y-axis lead screw motor moving device 22, the first X-axis lead screw motor moving device 25, and the Z-axis lead screw motor moving device 27, the electric screw locking device 29 moves in three-dimensional directions above the screw feeder 14, picks up the screws through a magnetic adsorption or jaw mechanism. After picking up the screws, the electric screw locking device 29 moves above the avoidance groove 13 at the bottom of the workbench 1. The second vision capture lens 542 of the screw inspection device 5 takes pictures of the screws through the avoidance groove 13. The first XYZ three-way screw distance adjustment mechanism 543 and the horizontal and vertical screw distance adjustment mechanism 544 adjust the positions of the lens and the first backlight 545 to ensure image clarity. The vision system compares the collected screw images with a preset standard template to detect parameters such as the screw head size and thread integrity. If it is determined that the material is NG, such as size out of tolerance or thread damage, the screw is removed through the control system, and the material is picked up again. The display screen 325 to be locked is placed on the quick-change carrier plate 323, and the suction cup 324 starts vacuum adsorption to ensure that the thin-walled display screen will not deform due to uneven stress during the locking process. The display screen is fixed to the clamping device 32. The longitudinal pressing device 4 of the display screen is started, and the X-axis cylinder pusher 42, the Z-axis micro lead screw motor moving device 43, the Y-axis cylinder pusher 44, and the Z-axis cylinder pusher 46 work together to accurately adjust the height and pressure of the pressing head 47 according to the thickness of the display screen, avoiding the problem of glass cracking caused by traditional rigid pressing, and at the same time achieving precise positioning of the special-shaped frame and improving the locking stability. The screw inspection device 5 is fixed at the bottom of the workbench 1, and the vision inspection device 54 takes pictures and compares the screws on the electric screw locking device 29 through the avoidance groove 13. The second vision capture lens 542, the first XYZ three-way screw distance adjustment mechanism 543, the horizontal and vertical screw distance adjustment mechanism 544, and the first backlight 545 work together. The horizontal and vertical screw distance adjustment mechanism 544 provides a sub-millimeter-level fine adjustment accuracy (the minimum adjustment amount is 0.005 mm), which can optimize the lens depth of field and light source angle for different specifications of screws (such as M1.5 - M5) to improve image clarity; the backlight eliminates the reflection interference, greatly improving the detection accuracy of screw surface defects (such as cracks and deformations). The vision inspection device driven by the lead screw motor achieves a detection accuracy of ±0.02 mm, performs a full inspection on the screw head size, thread integrity, etc., and automatically removes defective screws such as out-of-tolerance size and damaged threads through comparison with the preset standard template, preventing defective products from flowing into subsequent processes, and the detection cycle is ≤0.5 seconds, without affecting the overall production efficiency. The screw assembly inspection device 6 is flush with the display screen adsorption clamping table 3. The third X-axis screw motor moving device 61 drives it to complete the lateral movement, and the height of the screws on the assembled display screen 325 is inspected one by one. The second XYZ three-way spiral distance adjustment mechanism 63, the third visual capture lens 64, the third XYZ three-way spiral distance adjustment mechanism 65 and the second backlight source 66 work together. The lens and light source positions are dynamically adjusted through the spiral distance adjustment mechanism to achieve three-dimensional detection of the screws after locking. The protruding height and inclination of the screws can be measured, and defects such as missed locks and floating locks can be automatically identified. The flush design ensures that the detection field of view is unobstructed. The lateral scanning speed reaches 300mm / s, and the detection time of a single screw is less than 0.3 seconds. The floating lock problem caused by insufficient torque can be found through height detection. The detection system automatically records the bad position, which is convenient for traceability and quality improvement, ensuring that each screw meets the process standards and reduces the cost of manual re-inspection. .

[0022] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0023] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A screw locking device for the rear cover of a display, comprising a workbench (1), characterized in that: On one side of the upper end of the workbench (1), a screw locking and mounting mechanism (2) is provided. On one side of the screw locking and mounting mechanism (2), a display screen adsorption and clamping table (3) is provided. On both sides of the display screen adsorption and clamping table (3), display screen longitudinal pressing devices (4) are provided. On one side of the display screen adsorption and clamping table (3), directly below the screw locking and mounting mechanism (2), a screw inspection device (5) is provided. On the opposite end of the display screen adsorption and clamping table (3), a screw inspection device after assembly (6) is provided; the workbench (1) includes four-corner support frames (11), on the upper end of the four-corner support frames (11), a bearing panel (12) is provided, at the central position of the bearing panel (12), an avoidance groove (13) is provided, and on one side of the bearing panel (12), a screw feeder (14) is provided.

2. The screw locking device for the rear cover of a display according to claim 1, characterized in that: The screw locking and mounting mechanism (2) includes a support frame (21). On one side of the upper end of the support frame (21), a Y-direction screw motor moving device (22) is provided. On both sides of the upper end of the support frame (21), first slide rail and slider moving devices (23) are provided. On the first slide rail and slider moving devices (23), a cross beam panel (24) is provided. On one side of the cross beam panel (24), a first X-direction screw motor moving device (25) is provided. On one side of the upper end of the cross beam panel (24), a second slide rail and slider moving device (26) is provided. On the first X-direction screw motor moving device (25), a Z-direction screw motor moving device (27) is fixedly connected. On the Z-direction screw motor moving device (27), a vision capture lens (28) is provided. On the adjacent side of the vision capture lens (28), an electric screw locking device (29) is provided. The electric screw locking device (29) is assembled with the screw feeder (14) to pick up the screws on the screw feeder (14) through three-directional movement.

3. The screw locking device for the rear cover of a display according to claim 2, characterized in that: The display screen adsorption and clamping table (3) includes a fixed support plate (31). On the upper end of the fixed support plate (31), a clamping device (32) is provided. The clamping device (32) includes a bottom plate (321). On the bottom plate (321), a quick-change bearing plate (323) is provided for replacing display screens of different sizes. On the quick-change bearing plate (323), a number of suction cups (324) are provided. On the quick-change bearing plate (323), a display screen (325) is provided.

4. The screw locking device for the rear cover of a display according to claim 3, characterized in that: The display screen longitudinal pressing device (4) includes a support leg (41). On the upper end of the support leg (41), an X-direction cylinder pushing member (42) is provided. On the output end of the X-direction cylinder pushing member (42), a Z-direction micro screw motor moving device (43) is provided. On one side end of the Z-direction micro screw motor moving device (43), a Y-direction cylinder pushing member (44) is provided. On the output end of the Y-direction cylinder pushing member (44), an L-shaped connecting block (45) is provided. On one side end of the L-shaped connecting block (45), a Z-direction cylinder pushing member (46) is provided. On the lower end of the Z-direction cylinder pushing member (46), a pressing head (47) is provided.

5. The screw locking device for the rear cover of a display according to claim 4, wherein: The screw inspection device (5) includes an L-shaped fixed back plate (51). One side of the lower end of the L-shaped fixed back plate (51) is provided with a second X-direction screw motor moving device (52). The upper end of the second X-direction screw motor moving device (52) is provided with a third slide rail slider moving device (53). One side of the second X-direction screw motor moving device (52) is provided with a vision inspection device (54).

6. The screw locking device for the rear cover of a display according to claim 5, wherein: The vision inspection device (54) includes a fixed back plate (541). One side of the fixed back plate (541) is provided with a second vision capture lens (542). The lower end of the second vision capture lens (542) is provided with a first XYZ three-direction screw distance adjustment mechanism (543). One adjacent side of the first XYZ three-direction screw distance adjustment mechanism (543) is provided with a horizontal and vertical screw distance adjustment mechanism (544). The upper end of the horizontal and vertical screw distance adjustment mechanism (544) is provided with a first backlight (545).

7. The screw locking device for the rear cover of a display according to claim 6, characterized in that: The post-assembly screw inspection device (6) includes a third X-direction screw motor moving device (61). A fixed plate (62) is arranged on the third X-direction screw motor moving device (61). A second XYZ three-direction screw distance adjustment mechanism (63) is arranged on the fixed plate (62). One side of the second XYZ three-direction screw distance adjustment mechanism (63) is provided with a third vision capture lens (64). Another side of the fixed plate (62) is provided with a third XYZ three-direction screw distance adjustment mechanism (65). A second backlight (66) is arranged on the third XYZ three-direction screw distance adjustment mechanism (65).

8. A screw locking device for the rear cover of a display according to claim 7, characterized in that: The screw inspection device (5) is fixed to the bottom of the workbench (1). Through the avoidance groove (13), the vision inspection device (54) is used to take pictures and compare the screws on the electric screw locking device (29) to exclude NG materials.

9. The screw locking device for the rear cover of a display according to claim 8, characterized in that: The post-assembly screw inspection device (6) is flush with the display screen adsorption clamping table (3), and can simultaneously perform a horizontal movement to inspect the height of the screws on the assembled display screen (325) one by one.

10. The screw locking device for the rear cover of a display according to claim 9, characterized in that: The first XYZ three-direction screw distance adjustment mechanism (543), the horizontal and vertical screw distance adjustment mechanism (544), the second XYZ three-direction screw distance adjustment mechanism (63), and the third XYZ three-direction screw distance adjustment mechanism (65) are all finely adjusted through a screw adjustment structure to adjust the distance between the lens and the light source to achieve the best distance.

Images