Display panel appearance inspection machine

Abstract

The invention provides a display panel appearance inspection machine, and relates to the technical field of display panel appearance inspection.The display panel appearance inspection machine comprises a rack, an inspection system and a supporting system arranged on one side of the inspection system, the supporting system comprises a lifting rotating mechanism and a supporting mechanism, and the supporting mechanism is designed to be a double-strip-plate supporting mechanism; and a central panel is arranged at the top of the lifting rotating mechanism. According to the lifting rotating mechanism, the display panel is fixed by adopting the two strip-shaped suction cups which are arranged in parallel at intervals, the area occupied by the two strip-shaped suction cups which are arranged in parallel at intervals is small, enough space is provided for design of the center panel of the lifting rotating mechanism, it is guaranteed that the center panel can stably support the display panel in the posture exchange process, and the display effect is improved. The problems that the panel is deformed, the detection precision is influenced, and even the panel is damaged are solved.

Description

TECHNICAL FIELD

[0001] The application relates to the field of display panel appearance inspection technology, and particularly relates to a display panel appearance inspection machine. BACKGROUND

[0002] Display panels (such as LCD and OLED panels) need to be strictly inspected in the production process.

[0003] The existing appearance inspection machine usually adopts a double-support structure system to realize the detection and posture exchange function; the system mainly comprises a main support table fixed in a detection shell and an independently arranged lifting and rotating mechanism; the main support table bears and stabilizes the panel to perform image acquisition, and the lifting and rotating mechanism is used for converting the posture of the display panel. In the current standard design, the two components are distributed in parallel or inside and outside to avoid motion interference, and respectively occupy different projection areas below the panel, and each provides support to the panel through an independent contact surface.

[0004] When a large panel is detected, the limited bottom projection area needs to accommodate two independent support systems (the main support table and the lifting and rotating mechanism), which is difficult to provide uniform and stable area support, is easy to cause panel deformation, affects the detection accuracy, and even causes damage to the panel. SUMMARY

[0005] In view of the defects of the prior art, the application provides a display panel appearance inspection machine, which solves the problems of panel deformation, affects the detection accuracy, and even causes damage to the panel when a large panel is detected.

[0006] To achieve the above purpose, the application is implemented through the following technical solutions:

[0007] The display panel appearance inspection machine comprises a rack, a detection system, and a support system arranged on one side of the detection system; the support system comprises a lifting and rotating mechanism and a support mechanism;

[0008] The support mechanism is a double-strip plate support mechanism, which comprises two parallel and spaced strip suction cups;

[0009] The lifting and rotating mechanism is provided with a center panel at the top; the center panel is located between the two strip suction cups;

[0010] The center panel is provided with a group of auxiliary support members capable of independently lifting and descending relative to the center panel at the two side edges close to the strip suction cups;

[0011] The area of the center panel accounts for at least 30%-50% of the bottom projection area of the display panel.

[0012] Preferably, the lifting and rotating mechanism comprises:

[0013] a first bracket, a sliding middle frame is arranged on the inner side of the first bracket;

[0014] a lifting driving assembly, which is installed below the first bracket and is used to drive the sliding middle frame to slide up and down;

[0015] a rotating driving assembly, which comprises a rotating motor fixedly installed on the top of the sliding middle frame and a top rod member driven by the rotating motor;

[0016] a panel bearing assembly, which is installed on the top end of the top rod member and comprises:

[0017] a mounting beam, the bottom of which is fixedly connected with the top rod member, and the top of which is fixedly installed with the central panel;

[0018] a lateral expansion mechanism, which comprises a side pushing member fixedly installed on the bottom of the mounting beam, and an extension block fixedly connected with the output end of the side pushing member and slidably matched with the mounting beam, and the top of the extension block is fixedly installed with an extension panel;

[0019] the extension panel is arranged adjacent to the central panel, and a gap is left between the two, in which a reverse U-shaped elastic sheet member is installed, which is configured to change the height of the top thereof when switching between the compressed state and the released state.

[0020] Preferably, the lifting driving assembly comprises:

[0021] a second bracket, which is fixedly installed on the bottom of the first bracket;

[0022] a lifting motor, which is fixedly installed below the second bracket; and

[0023] a screw rod member driven by the lifting motor and threadedly matched with the sliding middle frame.

[0024] Preferably, the double-strip plate supporting mechanism comprises:

[0025] a double-mover reverse linear module;

[0026] two support moving base plates, which are respectively fixedly installed on the two action output ends of the double-mover reverse linear module;

[0027] two groups of strip-shaped suction cups, which are respectively fixedly installed on the top of the two support moving base plates.

[0028] Preferably, the detection system comprises:

[0029] a Y-axis module;

[0030] a gantry, which is fixedly installed on the action output end of the Y-axis module;

[0031] A double-mover linear motor piece is fixedly installed on the top beam of the gantry;

[0032] Two mounting plates are fixedly installed on the two action output ends of the double-mover linear motor piece, respectively;

[0033] Two visual detection modules are fixedly installed on each of the mounting plates and are arranged in a vertical direction.

[0034] Preferably, the gantry comprises a support assembly, a bottom platform, a middle platform, and an isosceles trapezoidal cover frame.

[0035] The support assembly is composed of four groups of vertically arranged support rods, the bottom ends of which are fixedly connected to the bottom platform, the middle parts of which are fixedly connected to the middle platform, and the top ends of which are fixedly connected to the isosceles trapezoidal cover frame.

[0036] The middle platform is fixedly installed with a marble plate, and the detection system and the support system are installed on the marble plate.

[0037] The bottom of the isosceles trapezoidal cover frame is provided with a downward channel opening, and each end of the channel opening is fixedly installed with an extension frame.

[0038] Further comprising two groups of taking / placing material mechanical arm assemblies, which are respectively installed on the inside of both sides of the channel opening and extend towards the two ends of the channel opening.

[0039] Preferably, the taking / placing material mechanical arm assembly comprises:

[0040] A base plate piece is fixedly installed on the inside of the channel opening.

[0041] A first X-axis module is fixedly installed on the base plate piece.

[0042] A first Z-axis module is fixedly installed on the action output end of the first X-axis module.

[0043] A suction disc frame is fixedly installed on the bottom telescopic end of the first Z-axis module.

[0044] A plurality of suction disc pieces are uniformly distributed on the bottom of the suction disc frame.

[0045] Preferably, a conveying line is provided on the outside of the gantry and corresponds to the position of the taking / placing material mechanical arm assembly.

[0046] Preferably, the surface of the inverted U-shaped elastic sheet piece is provided with an elastic pad layer.

[0047] Preferably, a acrylic plate is installed on the outside of the gantry.

[0048] The display panel appearance inspection machine has the following beneficial effects:

[0049] 1、The display panel appearance inspection machine has the following beneficial effects:

[0050] 2、The display panel appearance inspection machine has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 FIG. 1 is a perspective view of the display panel appearance inspection machine;

[0052] Figure 2 FIG. 2 is a front view of the display panel appearance inspection machine;

[0053] Figure 3 FIG. 3 is a perspective view of the frame structure of the display panel appearance inspection machine;

[0054] Figure 4 FIG. 4 is a schematic view of the support system and the detection system of the display panel appearance inspection machine;

[0055] Figure 5 FIG. 5 is a perspective view of the lifting and rotating mechanism of the display panel appearance inspection machine;

[0056] Figure 6 FIG. 6 is a perspective view of the lifting and rotating mechanism of the display panel appearance inspection machine;

[0057] Figure 7 FIG. 7 is a distribution schematic view of the strip-shaped suction cups and the center panel of the display panel appearance inspection machine;

[0058] Figure 8 FIG. 8 is a schematic view of the strip-shaped suction cups supporting the display panel of the display panel appearance inspection machine;

[0059] Figure 9The schematic view of the lifting rotating mechanism of the display panel appearance inspection machine provided by the present application controls the display panel to fall in the display panel process.

[0060] 1, rack; 101, support assembly; 102, bottom platform; 103, middle platform; 104, isosceles trapezoidal cover frame; 105, passage; 106, extension frame; 2, taking / putting material mechanical arm assembly; 201, base plate; 202, first X-axis module; 203, first Z-axis module; 204, suction cup frame; 205, suction cup; 3, support system; 301, lifting rotating mechanism; 301a, first bracket; 301b, sliding middle frame; 301c, rotating motor; 301d, top rod; 301e, second bracket; 301f, lifting motor; 301g, screw rod; 301h, side pushing piece; 301i, extension block; 301j, center panel; 301k, extension panel; 301m, inverted U-shaped elastic sheet; 301n, mounting beam; 302, double strip-shaped plate support mechanism; 302a, strip-shaped suction cup; 302b, support moving base plate; 302c, double moving magnet linear module; 4, detection system; 401, Y-axis module; 402, portal; 403, double moving magnet linear motor; 404, mounting plate; 405, visual detection module; 5, conveying line; a, display panel. DETAILED DESCRIPTION

[0061] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0062] As shown in the drawings, Figures 1-9 The display panel appearance inspection machine provided by the embodiments of the present application comprises a rack 1, a detection system 4 and a support system 3 arranged on one side of the detection system 4.

[0063] The rack 1 provides a space for installation and detection, the detection system 4 and the support system 3 are installed on the rack 1, and the support system 3 comprises a lifting rotating mechanism 301 and a support mechanism. When the appearance of the display panel is detected, the display panel is placed flat on the support mechanism, the detection system 4 detects the first position of the display panel, the lifting rotating mechanism 301 is lifted, the display panel is independently supported by the lifting rotating mechanism 301, the display panel is lifted up, the display panel is driven to rotate by a predetermined angle, for example, 90°, then the lifting rotating mechanism 301 falls back, the display panel is independently supported by the support mechanism again, and the detection system 4 detects the second position of the display panel.

[0064] In a specific design, the supporting mechanism is designed as a double-strip plate supporting mechanism 302, which includes two parallel and spaced strip-shaped suction cups 302a, as shown in Figure 8 As shown in the figure, when the two parallel and spaced strip-shaped suction cups 302a support the display panel a, the strip-shaped suction cups 302a work to exert suction force on the display panel a, which fixes the positions where the strip-shaped suction cups 302a are in contact with each other, so that the middle area of the display panel a cannot be bent in the center due to tension on both sides, thereby effectively protecting the display panel a; and the area occupied by the two parallel and spaced strip-shaped suction cups 302a is small, which provides sufficient space for the design of the central panel 301j of the lifting and rotating mechanism, so as to ensure that the central panel can also stably support the display panel during the posture exchange.

[0065] The strip-shaped suction cup 302a is specifically a long strip-shaped, multi-point or linear vacuum suction structure; for example, a ZPT series (thin suction cup); or a traditional single-point suction cup arranged in an array to form a long strip-shaped area.

[0066] In a specific design, the top of the lifting and rotating mechanism 301 is provided with a central panel 301j, which is a structure directly contacting and supporting the display panel a. The central panel 301j is located between the two strip-shaped suction cups 302a, which is beneficial to avoid movement interference with the strip-shaped suction cups 302a during driving and rotating.

[0067] In the design of the central panel 301j, it is required that the area of the central panel 301j is at least 30%-50% of the bottom projection area of the display panel a, for example, 40%, 45%, etc., which is supported on the bottom of the display panel a to ensure stable support; or in other words, when the central panel 301j supports the display panel a, the deformation of the area of the display panel a not in contact with the central panel 301j is within a controllable range, so as to avoid problems such as panel deformation, influence on detection accuracy, and even damage to the panel.

[0068] Considering that the area of the display panel a not in contact with the central panel 301j deforms during the process in which the central panel 301j supports the display panel a, this part coincides with the corresponding area of the strip-shaped suction cup 302a, so how to place the display panel a in a flat state on the strip-shaped suction cup 302a after the posture exchange is a problem to be solved, which is of great significance to ensure the detection accuracy of the display panel and avoid damage to the display panel during detection.

[0069] At the two side edges of the center panel 301j close to the strip-shaped suction disc 302a, a set of auxiliary support members capable of independent lifting motion relative to the center panel 301j is arranged; as shown in Figure 9 The auxiliary support members at the two side positions hold up the left and right sides of the display panel a, so that the display panel a is in a slightly upwardly curved state, one of the design purposes is to avoid the display panel a pressing down the side edges of the center panel 301j in the area where the display panel a is suspended beyond the center panel 301j, causing the display panel a to be partially stressed and concentrated, and forming a linear micro-damage on the display panel a; the second purpose is to place the display panel a in a flat state on the strip-shaped suction disc 302a after the attitude exchange, as shown in Figure 9 The center panel 301j is controlled to fall to a position consistent with the height of the strip-shaped suction disc 302a, and then the auxiliary support members are lowered, and then the strip-shaped suction disc 302a works to perform vacuum adsorption and fixation.

[0070] In an embodiment, the lifting and rotating mechanism 301 includes a first bracket 301a, a lifting drive assembly, a rotating drive assembly, and a panel bearing assembly.

[0071] The first bracket 301a is in the shape of an inverted "several" character, and is installed on the rack 1. The inner side of the first bracket 301a is slidably provided with a sliding middle frame 301b, which stably slides up and down on the corresponding designed guide rail. The lifting drive assembly is a power member for lifting, which is installed below the first bracket 301a and is used to drive the sliding middle frame 301b to slide up and down. The rotating drive assembly is a rotating power member, which includes a rotating motor 301c fixedly installed on the top of the sliding middle frame 301b, and a top rod member 301d driven by the rotating motor 301c. The rotating motor 301c drives the top rod member 301d to rotate. The panel bearing assembly is installed at the top end of the top rod member 301d. The panel bearing assembly is the part that directly contacts the display panel a, and can move up and down and rotate, thereby driving the display panel a to perform attitude conversion.

[0072] The panel bearing assembly includes a mounting beam 301n, a lateral expansion mechanism, and an inverted U-shaped elastic sheet member 301m. In the design process of this part, the function of the auxiliary support member is also realized, and the inverted U-shaped elastic sheet member 301m can be considered as also constituting the auxiliary support member.

[0073] The bottom of the mounting beam 301n is fixedly mounted with the top rod 301d, and the top is fixedly mounted with the center panel 301j. It is required that the area of the center panel 301j accounts for at least 30%-50% of the bottom projection area of the display panel a. A larger area is supported at the bottom of the display panel a to ensure that it can be stably supported. Generally, necessary protection pad structures can be designed in the center panel 301j to avoid damage to the center panel 301j caused by support extrusion. The lateral expansion mechanism includes a side pushing piece 301h fixed to the bottom of the mounting beam 301n, and an extension block 301i fixedly connected with the output end of the side pushing piece 301h and slidingly matched with the mounting beam 301n. The top of the extension block 301i is fixedly mounted with an extension panel 301k. The side pushing piece 301h can adopt a precision air cylinder for pushing the extension block 301i to slide along the length direction of the mounting beam 301n, and the extension block 301i drives the extension panel 301k to act. The top surface of the extension panel 301k is flush with the top surface of the center panel 301j. The extension panel 301k is arranged adjacent to the center panel 301j, and a gap is left between the extension panel 301k and the center panel 301j. A reverse U-shaped elastic sheet 301m is installed in the gap. The reverse U-shaped elastic sheet 301m is configured to change in height when it is switched between the compressed state and the released state.

[0074] When the side pushing piece 301h pushes the extension block 301i and further pushes the extension panel 301k away from the center panel 301j, the gap between the extension panel 301k and the center panel 301j becomes larger, causing the reverse U-shaped elastic sheet 301m to deform, thereby reducing the height of the reverse U-shaped elastic sheet 301m. Conversely, when the side pushing piece 301h pulls the extension block 301i towards the inside, the gap between the extension panel 301k and the center panel 301j becomes smaller, compressing the reverse U-shaped elastic sheet 301m to deform, thereby increasing the height of the top of the reverse U-shaped elastic sheet 301m.

[0075] In an embodiment, the lifting drive assembly includes a second bracket 301e, a lifting motor 301f, and a screw rod 301g.

[0076] The second bracket 301e is fixedly mounted at the bottom of the first bracket 301a. The lifting motor 301f is fixedly mounted below the second bracket 301e. The output end of the lifting motor 301f penetrates the bottom of the second bracket 301e and is located inside the second bracket 301e. The output end of the lifting motor 301f is in transmission connection with the screw rod 301g through a shaft coupling. The screw rod 301g cooperates with the sliding middle frame 301b. The screw rod 301g is rotatably mounted with the bottom of the first bracket 301a by a bearing / bush.

[0077] When working, the lifting motor 301f drives the screw rod 301g to rotate, the screw rod 301g is threadedly matched with the sliding middle frame 301b, and a screw rod matched mechanism formed by the screw rod 301g and the sliding middle frame 301b drives the sliding middle frame 301b to move up and down.

[0078] In an embodiment, the double-strip plate supporting mechanism 302 comprises a double-mover reverse linear module 302c, two supporting moving base plates 302b and two groups of strip-shaped suction cups 302a.

[0079] The double-mover reverse linear module 302c is a special form of precision linear motion mechanism, and its core feature is that two independently controllable moving sliders are integrated on a single linear guide rail, for example, a double-mover reverse linear module 302c driven by electromagnetism or a synchronous reverse moving module formed by a screw rod structure.

[0080] The two supporting moving base plates 302b are respectively fixedly installed on two action output ends of the double-mover reverse linear module 302c, and the two groups of strip-shaped suction cups 302a are respectively fixedly installed on top portions of the two supporting moving base plates 302b.

[0081] Generally, the double-mover reverse linear module 302c adopts a customized scheme, and can be combined to achieve synchronous driving of the two supporting moving base plates 302b to move towards the inside or the outside on the basis of a high-rigidity slide rail of the THK SR25W series and a left-right rotating ball screw (for example, a model BLK2520-5RRG0+502LC5, wherein RR represents right rotation), so that the two supporting moving base plates 302b are always symmetrically distributed on two sides of the display panel a, thereby adjusting the distance between the two groups of strip-shaped suction cups 302a and meeting the detection requirements of display panels a of different sizes (width / length).

[0082] In an embodiment, the detection system 4 comprises a Y-axis module 401, a portal frame 402, a double-mover linear motor 403, two mounting plates 404 and a visual detection module 405; the visual detection module 405 adopts an industrial CCD camera and is matched with a conventional detection and recognition algorithm.

[0083] The portal frame 402 is fixedly installed on an action output end of the Y-axis module 401, the double-mover linear motor 403 is fixedly installed on a top beam of the portal frame 402, and the two mounting plates 404 are respectively fixedly installed on two action output ends of the double-mover linear motor 403; two visual detection modules 405 are fixedly installed on each mounting plate 404 and are arranged in a vertical direction.

[0084] When detecting, the double-mover linear motor 403 drives the two mounting plates 404 to move, adjusts the positions of the two mounting plates 404, and makes the side edges of the display panel a located in the region between the two visual detection modules 405 arranged at intervals on the same mounting plate 404. With the Y-axis module 401 driving the gantry 402, the double-mover linear motor 403, the two mounting plates 404, and the visual detection modules 405 to move synchronously, the side edges of the display panel are detected in all directions.

[0085] For example, the display panel a is in a rectangular structure and has two groups of opposite side edges. The above process detects one group of opposite side edges; after the lifting and rotating mechanism 301 rotates the display panel a by 90°, the other group of opposite side edges is detected.

[0086] In an embodiment, the gantry 1 comprises a support assembly 101, a bottom platform 102, a middle platform 103, and an isosceles trapezoidal cover 104.

[0087] The support assembly 101 is composed of four groups of vertically arranged support rods, the bottom ends of which are fixedly connected to the bottom platform 102, the middle parts of which are fixedly connected to the middle platform 103, and the top ends of which are fixedly connected to the isosceles trapezoidal cover 104.

[0088] The middle platform 103 is fixedly installed with a marble plate, and the detection system 4 and the support system 3 are installed on the marble plate. The flatness of the top of the marble plate is controlled within 0.1 mm, which ensures the installation accuracy of the detection system 4 and the support system 3.

[0089] The bottom of the isosceles trapezoidal cover 104 is provided with a downward channel opening 105, and each end of the channel opening 105 is fixedly installed with an extension frame 106. Two groups of taking / placing material mechanical arm assemblies 2 are designed and installed on the inside of the two sides of the channel opening 105 and extend toward the two ends of the channel opening 105. The extension frame 106 is used to assist the installation of the taking / placing material mechanical arm assembly 2.

[0090] Generally, acrylic plates (not shown in the drawings) are installed on the outside of the gantry 1 to form a box-shaped structure, which ensures the cleanliness of the internal working area.

[0091] In an embodiment, the taking / placing material mechanical arm assembly 2 comprises a base plate 201, a first X-axis module 202, a first Z-axis module 203, a suction disc frame 204, and a plurality of suction disc pieces 205.

[0092] The substrate 201 is fixedly installed on the inner side of the passage opening 105, the first X-axis module 202 is fixedly installed on the substrate 201, the first Z-axis module 203 is fixedly installed on the action output end of the first X-axis module 202, the suction cup frame 204 is fixedly installed on the bottom telescopic end of the first Z-axis module 203, and the plurality of suction cup pieces 205 are uniformly distributed on the bottom of the suction cup frame 204.

[0093] The first X-axis module 202 and the first Z-axis module 203 constitute an X-axis-Z-axis moving mechanism, which is used for controlling the suction cup frame 204 and the plurality of suction cup pieces 205 to grasp the display panel a and move into the rack 1 or move the detected display panel a to the outside, thereby achieving the function of taking and placing materials.

[0094] The plurality of suction cup pieces 205 are uniformly distributed on the bottom of the suction cup frame 204, and fully consider the grasping of the display panel a to ensure that the display panel a can be horizontal and avoid deformation of the display panel a; the suction cup piece 205, for example, adopts a traceless suction cup to avoid leaving traces on the surface of the display panel.

[0095] In an embodiment, a conveying line 5 is also designed, which is arranged on the outer side of the rack 1 and corresponds to the position of the taking and placing material mechanical arm assembly 2, and is used for moving the display panel a to a predetermined position, thereby facilitating the taking and placing material mechanical arm assembly 2 to take materials or facilitating the conveying of the materials sent by the taking and placing material mechanical arm assembly 2 to the next process.

[0096] In an embodiment, the surface of the inverted U-shaped elastic sheet piece 301m is provided with an elastic pad layer, which is used for protecting the display panel a.

[0097] It is worth noting that the first X-axis module, the first Z-axis module, and the Y-axis module described above are all high-precision servo-driven linear molds with position feedback, which can be purchased from the market according to the precision requirements and stroke requirements.

[0098] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A display panel appearance inspection machine, comprising a rack (1), a detection system (4), and a support system (3) arranged on one side of the detection system (4), the support system (3) comprising a lifting and rotating mechanism (301) and a support mechanism, characterized in that: the support mechanism is a double-strip plate support mechanism (302), which comprises two strip-shaped suction cups (302a) arranged in parallel and at intervals; the lifting and rotating mechanism (301) is provided with a central panel (301j) at the top, and the central panel (301j) is located between the two strip-shaped suction cups (302a); the central panel (301j) is provided with a group of auxiliary support members capable of independent lifting motion relative to the central panel (301j) at the two side edges close to the strip-shaped suction cups (302a); the area of the central panel (301j) accounts for at least 30%-50% of the bottom projection area of the display panel (a).

2. The display panel appearance inspection machine according to claim 1, characterized by, the lifting and rotating mechanism (301) comprises: a first bracket (301a) with a sliding middle frame (301b) slidingly arranged on the inner side; a lifting drive assembly installed below the first bracket (301a) for driving the sliding middle frame (301b) to slide up and down; a rotating drive assembly comprising a rotating motor (301c) fixedly installed at the top of the sliding middle frame (301b), and a top rod member (301d) driven by the rotating motor (301c); a panel bearing assembly installed at the top end of the top rod member (301d), comprising: a mounting beam (301n) fixedly connected with the top rod member (301d) at the bottom and fixedly installed with the central panel (301j) at the top; a lateral expansion mechanism comprising a side pushing member (301h) fixed to the bottom of the mounting beam (301n), and an extension block (301i) fixedly connected with the output end of the side pushing member (301h) and in sliding cooperation with the mounting beam (301n), the top of the extension block (301i) being fixedly installed with an extension panel (301k); the extension panel (301k) is arranged adjacent to the central panel (301j) with a gap therebetween, and a reverse U-shaped elastic sheet member (301m) is installed in the gap, the reverse U-shaped elastic sheet member (301m) being configured to change in height at the top when switching between its compressed state and released state.

3. The display panel appearance inspection machine according to claim 2, characterized by, the lifting drive assembly comprises: a second bracket (301e) fixedly installed at the bottom of the first bracket (301a); a lifting motor (301f) fixedly installed below the second bracket (301e); and a screw rod member (301g) driven by the lifting motor (301f) and in threaded cooperation with the sliding middle frame (301b).

4. The display panel appearance inspection machine according to claim 1, characterized by, the double-strip plate support mechanism (302) comprises: a double-mover reverse linear module (302c); two support moving substrates (302b) fixedly installed on the two action output ends of the double-mover reverse linear module (302c), respectively; Two groups of strip-shaped suction cups (302a) are respectively fixedly installed on the top of the two support moving base plates (302b).

5. The display panel appearance inspection machine according to claim 1, characterized by, The detection system (4) comprises: A Y-axis module (401); A portal frame (402) is fixedly installed on the action output end of the Y-axis module (401); A double-mover linear motor piece (403) is fixedly installed on the top crossbeam of the portal frame (402); Two installation plates (404) are respectively fixedly installed on the two action output ends of the double-mover linear motor piece (403); Two vision detection modules (405) are fixedly installed on each installation plate (404) and are arranged in a vertical direction.

6. The display panel appearance inspection machine according to claim 1, characterized by, The rack (1) comprises a support assembly (101), a bottom platform (102), a middle platform (103), an isosceles trapezoidal cover rack (104); The support assembly (101) is composed of four groups of vertically arranged support rods, the bottom ends of which are fixedly connected with the bottom platform (102), the middle parts of which are fixedly connected with the middle platform (103), and the top ends of which are fixedly connected with the isosceles trapezoidal cover rack (104); The middle platform (103) is fixedly installed with a marble plate, and the detection system (4) and the support system (3) are installed on the marble plate; The bottom of the isosceles trapezoidal cover rack (104) is provided with a downward channel opening (105), and two extension frames (106) are fixedly installed at the two ends of the channel opening (105). Further comprising: two groups of taking / placing material mechanical arm assemblies (2) which are respectively installed on the inner sides of the channel openings (105) and extend towards the two ends of the channel openings (105).

7. The display panel appearance inspection machine according to claim 6, characterized by, The taking / placing material mechanical arm assembly (2) comprises: A base plate piece (201) is fixedly installed on the inner side of the channel opening (105); A first X-axis module (202) is fixedly installed on the base plate piece (201); A first Z-axis module (203) is fixedly installed on the action output end of the first X-axis module (202); A suction cup rack (204) is fixedly installed on the bottom telescopic end of the first Z-axis module (203); A plurality of suction cup pieces (205) are uniformly distributed on the bottom of the suction cup rack (204).

8. The display panel appearance inspection machine according to claim 6, characterized by Further comprising: A conveying line (5) is arranged on the outer side of the rack (1) and corresponds to the position of the taking / placing material mechanical arm assembly (2).

9. The display panel appearance inspection machine according to claim 2, characterized by: The surface of the inverted U-shaped elastic sheet piece (301m) is provided with an elastic pad layer.

10. The display panel appearance inspection machine according to claim 1, characterized by: An acrylic plate is installed on the outer side of the rack (1).

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