Visual inspection equipment for elevator landing door

Abstract

The invention discloses an elevator landing door visual inspection device, and relates to the technical field of elevator accessory processing, the elevator landing door visual inspection device comprises a rack used for placing an elevator landing door and two moving arms capable of longitudinally moving along the rack, and the two moving arms are symmetrically arranged and are connected through a connecting plate; and a plurality of first detection cameras for vertically and downwards shooting the surface of the landing door and a plurality of second detection cameras for horizontally and inwards shooting one side edge of the landing door are fixed on the movable arm. A first bracket capable of moving up and down is arranged between the two moving arms, and third detection cameras are arranged on the two sides of the first bracket. Visual inspection can be simultaneously carried out on the surfaces and the side edges of the two landing doors, after the inspection is completed, the two landing doors can be driven to be closed, visual inspection operation is carried out on the center seam of the two landing doors in the closed state, and whether the landing doors need to be further overhauled or not is judged. In the process, comprehensive and accurate detection operation can be carried out on the landing door, and it is ensured that the two combined pieces can meet factory requirements in the using state.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator parts processing, and in particular to a visual inspection device for elevator landing doors. Background Art

[0002] To ensure quality before elevator landing doors leave the factory, they are often visually inspected using automated machine vision systems and manual re-inspections. This inspection process requires the establishment of a machine vision system. Industrial cameras capture details such as the door's surface texture and edge alignment. Conveyors or robotic arms move the door through the inspection area to ensure full coverage. After scanning, the image undergoes image pre-processing: noise reduction, contrast enhancement, and distortion correction. High-precision machine vision enables elevator landing door inspections to achieve a high defect detection rate, while manual re-inspections ensure zero oversight of critical safety items.

[0003] The visual inspection equipment currently used for elevator floor doors requires turning the floor doors over in order to conduct a comprehensive inspection of all surfaces of the floor doors, which takes a long time. During the production process of the floor doors, improper stamping or bending processes (such as mold wear, incorrect pressure parameters) can easily cause slight depressions, protrusions or warping on the sides of the floor doors used to dock with another floor door. If the deviation exceeds the allowable value, it will directly affect the alignment accuracy of the floor doors, causing the docking gap between the floor doors and the other floor doors to not meet the specifications, affecting the normal production and use of the floor doors. However, among the existing inspection equipment, most of them can only detect whether there is any breakage on the surface of a single floor door, and cannot perform higher-precision inspections on combined floor doors, resulting in an extension of the time required to implement comprehensive inspections and a reduction in the efficiency of floor door inspections. Therefore, the present invention provides a visual inspection device for elevator floor doors to meet the needs. Summary of the Invention

[0004] In view of the above problems, the present invention provides an elevator floor door visual detection device.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a visual inspection device for elevator floor doors, comprising a frame for placing elevator floor doors and two movable arms that can move longitudinally along the frame, the two movable arms are symmetrically arranged and connected by a connecting plate, and the movable arms are fixed with multiple detection cameras 1 for vertically downward shooting of the floor door surface and detection camera 2 for horizontally inward shooting of a side edge of the floor door.

[0006] A first bracket that can be raised and lowered is provided between the two movable arms, and detection cameras three are provided on both sides of the first bracket. When the first bracket is lowered, the detection camera three and the detection camera two are symmetrically distributed on both sides of the floor door. As the movable arms move, the two groups of detection cameras one, two and three can perform visual inspection operations on the upper surface and two side edges of the two combined floor doors.

[0007] It further includes a drive unit for controlling the docking of the two combined door panels, a second support base parallel to the first support base, and a middle seam detection camera provided at the bottom end of the second support base. When the first support base rises, the second support base descends, and the middle seam detection camera falls directly above the docking side of the two combined landing doors. As the moving arm moves, the middle seam detection camera performs visual detection on the gap in the closed state of the landing door.

[0008] Furthermore, slide rails adapted to the first support base and the second support base are provided on one side of the two moving arms facing the first support base and the second support base. Rack teeth are provided on the inner sides of the first support base and the second support base, and the two sets of rack teeth are distributed relatively from left to right.

[0009] A first synchronous gear is meshed and connected to the rack tooth on the inner side of the first support base, and a second synchronous gear is meshed and connected to the rack tooth on the inner side of the second support base. The first synchronous gear and the second synchronous gear are installed on a connecting plate through the same drive shaft, and a motor for controlling the rotation of the drive shaft, the first synchronous gear and the second synchronous gear is provided outside the connecting plate. When the first support base and the rack tooth inside it move upward, the second support base and the rack tooth inside it move downward.

[0010] Furthermore, support rods symmetrically distributed on both sides of the middle seam detection camera are provided at the bottom end of the second support base, and rollers are provided at the bottom ends of the support rods. As the second support base descends, the rollers contact the surface of the combined landing door in the closed state.

[0011] Furthermore, a screw rod slide table adapted to one of the two moving arms and a guide rail adapted to the other moving arm are respectively provided on both sides of the machine frame, and the screw rod slide table and the guide rail are both vertically distributed with respect to the moving arm.

[0012] Furthermore, the drive unit includes two symmetrically distributed guide frames. The guide frames are both in a U-shaped structure, and a plurality of equally spaced linkage support feet are provided at the bottom ends of the guide frames. Channels for accommodating the lifting and horizontal movement of the guide frames and the linkage support feet are opened on the machine frame.

[0013] Two support seats are fixed below the machine frame, a jacking seat is provided above each support seat, the two jacking seats are respectively located below the two guide frames, and a first linear cylinder for controlling the linkage support feet and the guide frames to push the landing door to move horizontally is provided on each jacking seat, and a second linear cylinder for controlling the lifting movement of the jacking seat, the linkage support feet and the guide frames is provided on the support seat.

[0014] Furthermore, a plurality of equally spaced positioning tracks are embedded on the surface of the machine frame, and two support strips are provided inside each positioning track. The two support strips are symmetrically distributed and are respectively used for carrying the two landing doors.

[0015] Both sides of the support bar are provided with pulley groups adapted to the positioning track. When the two guide frames push the two landing doors to close and connect, the support bar and the pulley groups provided on both sides are located on the inner side of the positioning track and slide until the two landing doors are closed.

[0016] Furthermore, the linkage legs are provided with a locking block that can move synchronously with them, and the support bar is provided with a accommodating groove on one end facing the guide frame. When the two groups of guide frames rise to the top of the frame, the linkage legs and the end of the support bar are butted against each other, and the locking block is connected to the accommodating groove.

[0017] Furthermore, two laterally distributed detection cameras four are provided on the outer sides of the two movable arms. When the floor door is located above the movable arm and is transferred to the surface of the rack, the detection camera four can perform visual inspection operations on the lower surface of the floor door in the moving state.

[0018] In summary, the technical effects and advantages of the present invention are as follows:

[0019] 1. This invention simultaneously visually inspects the surfaces and sides of two landing doors. After the inspection is complete, the two doors can be driven closed and their center seams visually inspected to determine whether further maintenance is required. This process provides a comprehensive and accurate inspection of the landing doors, ensuring that the combined doors meet factory requirements when in use. Furthermore, the entire visual inspection process can be performed on the rack, reducing the time required to transport the doors and improving inspection efficiency.

[0020] 2. The present invention incorporates a guide frame that can flexibly dock with the landing door and propel it into movement and closure. This ensures precise docking and improves the efficiency of the door's movement. This ensures the center gap detection camera is precisely positioned at the door's gap in the closed state, further enhancing the accuracy of center gap detection. The entire process is automated, saving manpower. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0023] Figure 2 This is a schematic diagram of the connection between the movable arm, the first bracket and the second bracket of the present invention.

[0024] Figure 3 This is a schematic diagram of the connection between the movable arm, the first bracket and the second bracket from a second viewing angle of the present invention.

[0025] Figure 4 This is a schematic diagram of the connection between the first bracket, the second bracket, the first synchronous gear and the second synchronous gear of the present invention.

[0026] Figure 5 This is a structural schematic diagram of the guide frame of the present invention moving to the top of the frame.

[0027] Figure 6 This is a schematic diagram of the positions of the jacking seat, support seat and frame of the present invention.

[0028] Figure 7 This is a schematic diagram of the second viewing angle of the jacking seat, support seat and frame of the present invention.

[0029] Figure 8 This is a schematic diagram of the positions of the guide frame, linkage support legs and support bars of the present invention.

[0030] Figure 9 This is a schematic diagram of the state after the first bracket is raised and the second bracket is lowered according to the present invention.

[0031] Figure 10 It is a schematic diagram of the local state after the first bracket rises and the second bracket descends.

[0032] In the figure: 1. Frame; 2. Moving arm; 21. Detection camera 1; 22. Detection camera 2; 23. Detection camera 4; 3. Connecting plate; 4. First bracket; 5. Detection camera 3; 6. Second bracket; 61. Support rod; 62. Roller; 7. Center seam detection camera; 8. Screw slide; 9. Guide rail; 10. Synchronous gear 1; 11. Synchronous gear 2; 12. Guide frame; 13. Linkage support foot; 131. Positioning block; 14. Lifting seat; 141. Linear cylinder 1; 15. Support seat; 151. Linear cylinder 2; 16. Positioning rail; 17. Support bar; 171. Pulley block; 172. Accommodating groove. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Example 1: Reference Figure 1-4The illustrated device for visual inspection of elevator landing doors comprises a frame 1 for mounting the elevator landing doors and two movable arms 2 that are movable longitudinally along the frame 1. The two movable arms 2 are symmetrically arranged and connected at 3. Affixed to the movable arms 2 are multiple inspection cameras 1 (21) that vertically downwardly photograph the landing door surface, and an inspection camera 2 (22) that horizontally inwardly photographs a side edge of the landing door. The presence of two inspection cameras 1 (21) is intended to prevent imaging errors caused by reflections from the landing door surface. The two inspection cameras 1 (21) enable more comprehensive and accurate visual inspection of the landing door surface.

[0035] A first bracket 4, capable of ascending and descending, is positioned between the two movable arms 2. Inspection cameras 3 5 are positioned on both sides of the first bracket 4. These cameras 3 5 are positioned opposite to the second inspection camera 22 and are used to capture the other side of the landing door. When the first bracket 4 descends, the third inspection camera 5 and the second inspection camera 22 are symmetrically positioned on either side of the landing door. As the movable arms 2 move, the two sets of inspection cameras 1 21 and 3 5 perform visual inspections of the upper surfaces and two side edges of the two combined landing doors. The images detected by the two sets of inspection cameras 1 21 and 3 5 are transmitted to the PLC control system, which analyzes whether the landing door has any damage (e.g., scratches, dents, rust spots, or coating bubbles) and whether it meets standards. If it does not meet standards, it indicates that the landing door requires further maintenance.

[0036] In addition to inspecting the surface of the elevator landing doors, the gap between the two landing doors also needs to be checked. Excessive gaps can cause increased friction between the door leaf and the door frame, accelerating wear of door machine components (such as guide rails and rollers) over long periods of operation, and even burning out the motor. The elevator door's infrared or light curtain sensors can misjudge due to gap obstruction or misalignment, causing the door to open or close, resulting in elevator stalls or repeated door opening and closing. Long-term friction can cause deformation and even rust on the door frame and sill, further widening the gap and creating a vicious cycle.

[0037] To this end, this embodiment provides the following solution for the center gap between two landing doors after closing. The elevator landing door visual inspection device disclosed in this embodiment also includes a drive unit that can control the docking of two combined door panels, a second bracket 6 arranged parallel to the first bracket 4, and a center gap detection camera 7 located at the bottom end of the second bracket 6.

[0038] When inspecting a single landing door, the two doors are positioned beneath two movable arms 2, creating a certain distance between them. After completing the single-leaf landing door inspection, the drive unit pushes the two doors together, facilitating inspection of the center gap after closure. When the first bracket 4 rises, clearing space for the two doors to close, the second bracket 6 descends, allowing the center gap inspection camera 7 to land directly above the butted edges of the two combined landing doors. As the movable arms 2 move, the center gap inspection camera 7 visually inspects the gap between the closed doors.

[0039] Therefore, in the present invention, after visual inspection of the surface and sides of the floor door, visual inspection can also be performed on the center seam in its closed state according to the working state of the floor door. The center seam detection camera 7 transmits the image of the center seam of the floor door in the closed state to the PLC control system. In the control system, it can be analyzed whether the gap specifications of the floor door in the docking state meet the standards (for example, whether the gap size meets the standards when the floor door is closed, whether the gap is uneven due to the processing error of the floor door, and the gap is distorted, etc.). If it does not meet the standards, it means that the combined floor door needs further maintenance.

[0040] During the above process, a comprehensive and accurate inspection operation can be performed on the landing door to ensure that the two assembled parts meet the factory requirements when in use. In addition, in the present invention, the entire visual inspection process can be performed on the rack 1, which reduces the time required to transport the landing door and improves the efficiency of the inspection work.

[0041] like Figure 3 、 Figure 4 As shown, the two movable arms 2 are provided with slide rails compatible with the first bracket 4 and the second bracket 6 on one side facing the first bracket 4 and the second bracket 6, and racks are provided on the inner sides of the first bracket 4 and the second bracket 6, and the two sets of racks are distributed relatively from left to right.

[0042] Synchronous gear 10 is meshed with the rack located inside the first bracket 4, and synchronous gear 2 is meshed with the rack located inside the second bracket 6. Synchronous gears 10 and 11 are mounted on the connecting plate 3 via the same drive shaft. A motor is installed outside the connecting plate 3 to control the rotation of the drive shaft, synchronous gears 10 and 11. When the first bracket 4 and its inner rack move upward, the second bracket 6 and its inner rack move downward.

[0043] Therefore, after inspection cameras 1 21 and 3 5 complete their visual inspection of the upper surfaces and two longer sides of the two combined landing doors, they ascend as the first bracket 4 rises. Meanwhile, center gap inspection camera 7 descends along with the second bracket 6 to directly above the abutting sides of the two combined landing doors, performing a visual inspection of the gap between the closed landing doors. During the visual inspection, since the first bracket 4, inspection cameras 1 21, and 3 5 have already ascended to their travel height, they can avoid the closed landing doors during their movement, ensuring smooth visual inspection of the center gap.

[0044] like Figure 9 、 Figure 10 As shown, the bottom end of the second bracket 6 is equipped with support rods 61 symmetrically distributed on both sides of the center seam detection camera 7. The bottom end of each support rod 61 is equipped with a roller 62. As the second bracket 6 descends, the roller 62 contacts the surface of the combined landing door in the closed state. When the second bracket 6 moves with the movable arm 2, the arrangement of the support rods 61 and roller 62 can improve the stability of the second bracket 6 during movement, thereby improving the inspection quality of the center seam detection camera 7, avoiding the phenomenon of image acquisition deviation caused by shaking of the second bracket 6 during movement, and improving the accuracy of the center seam visual inspection.

[0045] like Figure 1 As shown, in order to enable the two movable arms 2 to move smoothly and perform visual inspection operations on the floor door, in the present invention, a screw slide 8 adapted to one of the two movable arms 2 and a guide rail 9 adapted to the other movable arm 2 are provided on both sides of the frame 1, and the screw slide 8 and the guide rail 9 are both distributed vertically to the movable arm 2.

[0046] Specifically, in the actual working process of the present invention, first, the screw slide 8 drives the movable arm 2 to move, and the movable arm 2 carries the inspection camera 1 21 and the inspection camera 3 5 and moves along the distribution direction of the guide rail 9 to perform visual inspection operations on the upper surface and the two longer side edges of the two combined floor doors. After the inspection operation is completed, the drive unit controls the two floor doors to be in a closed state. At this time, under the control of the PLC program controller, the motor controls the drive shaft, the synchronous gear 1 10 and the synchronous gear 2 11 to rotate, the first bracket 4 rises, the second bracket 6 falls, and the support rod 61 contacts the surface of the combined floor door in the closed state through the roller 62. Subsequently, the screw slide 8 drives the movable arm 2 to move and reset along the original path. During this process, the center seam inspection camera 7 performs a visual inspection operation on the gap in the closed state of the floor door.

[0047] Example 2: Based on Example 1, Figure 5 、 Figure 6As shown, the driving unit includes two symmetrically distributed guide frames 12. The guide frames 12 are both in a U-shaped structure, and multiple equally spaced linkage feet 13 are provided at the bottom ends of the guide frames 12. Channels for accommodating the lifting and horizontal movement of the guide frames 12 and the linkage feet 13 are provided on the frame 1.

[0048] After the two inspection cameras one 21 and inspection camera three 5 perform visual inspection operations on the upper surfaces and two longer sides of the two combined landing doors. In order to enable the linkage feet 13 and the guide frames 12 to rise and make the two guide frames 12 dock with the two landing doors. In the present invention, two support seats 15 are fixed below the frame 1. Lifting seats 14 are provided above the support seats 15. The two lifting seats 14 are respectively located below the two guide frames 12, and linear cylinders one 141 for controlling the linkage feet 13 and the guide frames 12 to push the landing door to move horizontally are provided on the lifting seats 14. A linear cylinder two 151 for controlling the lifting movement of the lifting seats 14, the linkage feet 13 and the guide frames 12 is provided on the support seats 15. After the linear cylinder two 151 drives the lifting seats 14, the linkage feet 13 and the guide frames 12 to rise and the guide frames 12 are successfully docked with the landing door, the linear cylinder one 141 then drives the linkage feet 13 and the guide frames 12 to push the landing door to move horizontally, as shown in Figure 6 shown.

[0049] In the present invention, by providing the guide frames 12 that can be movably docked with the landing door and push the landing door to move and close, while ensuring the accuracy in the docking process of the landing door, the efficiency of the landing door moving and docking work is also improved. After ensuring that the second support 6 descends, the middle seam inspection camera 7 can accurately fall on the gap position of the landing door in the closed state, further improving the accuracy of the middle seam inspection work. The whole process has the advantage of automation and saves human resources.

[0050] As Figure 6 shown, multiple equally spaced positioning tracks 16 are embedded on the surface of the frame 1. Two supporting strips 17 are provided inside each of the positioning tracks 16. The two supporting strips 17 are symmetrically distributed and are respectively used to carry the two landing doors. Pulley groups 171 adapted to the positioning tracks 16 are provided on both sides of the supporting strips 17. When the two guide frames 12 push the two landing doors to be closed and connected, the supporting strips 17 and the pulley groups 171 provided on both sides thereof are both located inside the positioning tracks 16 and slide until the two landing doors are closed.

[0051] The connection of the supporting strip 17 to the positioning track 16 through the pulley group 171 can reduce the friction between the landing door and the frame 1. When the guide frame 12 pushes the landing door to move and close, the movement of the supporting strip 17 can reduce the frictional resistance during the movement of the landing door, improve the speed during the movement of the landing door, and ensure that the landing door can move quickly and accurately.

[0052] As Figure 7 as Figure 8As shown, the linkage legs 13 are each provided with a locking block 131 that can move synchronously therewith, and the end of the support bar 17 facing the guide frame 12 is provided with a receiving groove 172. When the two groups of guide frames 12 rise to the top of the frame 1, the linkage legs 13 and the end of the support bar 17 are abutted against each other, and the locking block 131 is in contact with the receiving groove 172.

[0053] The combination of the locking block 131 and the accommodating groove 172 ensures precise alignment of the linkage leg 13 and the support bar 17 during the guide frame 12's ascent. As the guide frame 12 pushes the landing door to move and close, the door and the support bar 17 maintain consistency and stability during movement until the door is closed, allowing for center seam detection in the closed state.

[0054] It is worth mentioning that in the present invention, when the two landing doors are transferred to the surface of the rack 1, the structure of the combination of the suction cup and the robot arm is mostly used to perform the transfer operation on the landing doors. In order to be able to perform visual inspection operations on the lower surface of the landing door, such as Figure 1 As shown, two laterally distributed detection cameras 23 are provided on the outside of the two movable arms 2. Before the floor door is transferred, according to the visual inspection requirements, with reference to the visual inspection method in Example 1, visual inspection operations can be performed on the two shorter side edges in front and behind the floor door. Subsequently, under the action of the suction cup and the robotic arm, the floor door located above the movable arm 2 can be moved laterally until the floor door falls on the designated position of the rack 1. When the floor door is located above the movable arm 2 and is transferred to the surface of the rack 1, the detection camera 23 can perform visual inspection operations on the lower surface of the floor door in the moving state. After that, the movable arm 2 can perform visual inspection operations on the upper surface, the two longer side edges and the center seam of the floor door. The whole process takes a short time, which improves the efficiency of the visual inspection work of the floor door.

[0055] The inspection cameras 1 21, 22, 3 5, 4 23, and 7 in the present invention are all industrial cameras known in the art. In actual operation, software algorithms are used to pre-process images for noise reduction, contrast enhancement, and distortion correction. Feature extraction is then performed using edge detection (such as the Canny algorithm) and template matching (to locate key components). Finally, a deep learning-based classification model (such as ResNet and YOLO) is trained on a dataset to identify complex defects such as cracks and rust.

[0056] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An elevator landing door visual inspection device, comprising a frame (1) for placing the elevator landing door and two movable arms (2) movable along the longitudinal direction of the frame (1), wherein the two movable arms (2) are symmetrically arranged and connected by a connecting plate (3), characterized in that: A plurality of detection cameras one (21) that vertically shoot the surface of the landing door downward and detection cameras two (22) that horizontally shoot one side edge of the landing door inward are fixed on the moving arm (2). A first support (4) capable of ascending and descending movements is provided between the two moving arms (2). Detection cameras three (5) are provided on both sides of the first support (4). When the first support (4) descends, the detection cameras three (5) and the detection cameras two (22) are symmetrically distributed on both sides of the landing door. As the moving arm (2) moves, the two groups of detection cameras one (21), detection cameras two (22), and detection cameras three (5) can perform visual detection operations on the upper surface and the two side edges of the two combined landing doors. It further includes a driving unit for controlling the docking of the two combined door panels, a second support (6) distributed in parallel with the first support (4), and a middle seam detection camera (7) provided at the bottom end of the second support (6). When the first support (4) ascends, the second support (6) descends, and the middle seam detection camera (7) falls directly above the docking side edges of the two combined landing doors. As the moving arm (2) moves, the middle seam detection camera (7) performs visual detection operations on the gap in the closed state of the landing door.

2. The elevator door visual inspection device according to claim 1, characterized in that: On one side of the two moving arms (2) facing the first support (4) and the second support (6), slide rails adapted to the first support (4) and the second support (6) are provided. Rack teeth are provided inside the first support (4) and the second support (6), and the two groups of rack teeth are distributed relatively from left to right. A synchronous gear one (10) is meshed and connected to the rack tooth inside the first support (4), and a synchronous gear two (11) is meshed and connected to the rack tooth inside the second support (6). The synchronous gear one (10) and the synchronous gear two (11) are installed on a connecting plate (3) through the same driving shaft. A motor for controlling the rotation of the driving shaft, the synchronous gear one (10), and the synchronous gear two (11) is provided outside the connecting plate (3). When the first support (4) and the rack tooth inside it ascend, the second support (6) and the rack tooth inside it descend.

3. The elevator door visual inspection device according to claim 2, characterized in that: Support rods (61) symmetrically distributed on both sides of the middle seam detection camera (7) are provided at the bottom end of the second support (6). Wheels (62) are provided at the bottom ends of the support rods (61). As the second support (6) descends, the wheels (62) contact the surface of the combined landing door in the closed state.

4. The elevator door visual inspection device according to claim 1, characterized in that: On both sides of the frame (1), a screw rod slide table (8) adapted to one of the two moving arms (2) and a guiding slide rail (9) adapted to the other moving arm (2) are respectively provided. The screw rod slide table (8) and the guiding slide rail (9) are both vertically distributed with respect to the moving arm (2).

5. The elevator door visual inspection device according to claim 1, characterized in that: The driving unit includes two symmetrically distributed guiding frames (12). The guiding frames (12) are both in a U-shaped structure, and a plurality of equally spaced linkage feet (13) are provided at the bottom ends of the guiding frames (12). Channels for accommodating the ascending, descending, and lateral movement of the guiding frames (12) and the linkage feet (13) are provided on the frame (1). Two support seats (15) are fixed below the frame (1), and a lifting seat (14) is provided above each of the support seats (15). The two lifting seats (14) are respectively located below the two guide frames (12), and each of the lifting seats (14) is provided with a linear cylinder (141) that can control the linkage support leg (13) and the guide frame (12) to push the floor door to move horizontally. The support seat (15) is provided with a linear cylinder (151) that can control the lifting seat (14), the linkage support leg (13) and the guide frame (12) to move up and down.

6. The elevator door visual inspection device according to claim 5, characterized in that: The surface of the frame (1) is embedded with a plurality of equally spaced positioning rails (16), and the inner side of each positioning rail (16) is provided with two support bars (17), which are symmetrically distributed and respectively used to carry two landing doors; Both sides of the support bar (17) are provided with pulley blocks (171) adapted to the positioning track (16). When the two guide frames (12) push the two landing doors to close and connect, the support bar (17) and the pulley blocks (171) provided on both sides thereof are located inside the positioning track (16) and slide until the two landing doors are closed.

7. The elevator door visual inspection device according to claim 6, characterized in that: The linkage legs (13) are each provided with a positioning block (131) that can move synchronously therewith, and the support bar (17) is provided with an accommodating groove (172) at one end thereof facing the guide frame (12). When the two groups of guide frames (12) rise to the top of the frame (1), the linkage legs (13) and the end of the support bar (17) abut against each other, and the positioning block (131) and the accommodating groove (172) are in contact with each other.

8. The elevator landing door visual inspection device according to claim 1, characterized in that: Two laterally distributed detection cameras (23) are provided on the outer sides of the two movable arms (2). When the floor door is located above the movable arm (2) and is transferred to the surface of the frame (1), the detection camera (23) can perform visual detection operations on the lower surface of the floor door in the moving state.

Images