Carrying device and corresponding PCB appearance detection equipment

Abstract

The utility model provides a carrying device and corresponding PCB appearance detection equipment. The carrying device comprises a platform, an adsorption table, a limiting assembly and a carrying driver. The adsorption table is arranged above the platform in a sliding mode in the vertical direction, adsorption holes are formed in the bottom face of the adsorption table, and the adsorption table comprises a jacking position, a plate adsorption position and a plate placing position which are sequentially arranged from top to bottom on the sliding track of the adsorption table. The limiting assembly comprises a limiting plate and a limiting mechanism. The limiting plate is connected to the adsorption table, and a limiting hole is formed in the limiting plate. The limiting mechanism comprises a telescopic rod, the telescopic rod is arranged in the axial direction of the limiting hole in a telescopic mode, and the telescopic rod comprises an extending position and a retracting position in the moving direction. When the adsorption table is located at the plate adsorption position, the telescopic rod abuts against the top of the limiting hole and is used for limiting the adsorption table to move towards the plate placement position. According to the carrying device and the corresponding PCB appearance detection equipment, the positioning structure is simple and accurate, and the phenomenon that the PCB is damaged due to the fact that the downward moving stroke of the adsorption table is too large is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of automation equipment, and in particular to a handling device and corresponding PCB appearance detection equipment. Background Art

[0002] PCB boards usually need to be inspected by PCB appearance inspection equipment to avoid appearance defects of PCB boards. PCB appearance inspection equipment includes a discharge device, a conveying device and a handling device. The conveying device adsorbs the PCB board through an adsorption plate, and the adsorption hole of the adsorption plate faces upward. The conveying device is arranged on the platform along the horizontal movement. The conveying device includes an upper material position and a lower material position. When the conveying device is at the lower material position, the conveying device is located above the discharge device. When the conveying device is at the upper material position, the conveying device is located on the horizontal side of the discharge device. The PCB board needs to be transported to the discharge device by a handling device. The handling device adsorbs the PCB board through an adsorption table, and the bottom surface of the adsorption table is provided with suction holes. The adsorption table has three positions, which are respectively the top position, the board suction position and the board placement position from top to bottom. The adsorption table is initially in the top position. After the conveying device moves to the lower material position, the adsorption table moves down to the board suction position and adsorbs the PCB board. Then the adsorption table moves up again and returns to the top position. After the conveying device returns to the upper material position, the adsorption table moves down to the board placement position and places the PCB board on the discharge device. In the handling device in the prior art, the uppermost lifting position and the lowermost board placing position of the adsorption table are generally controlled by stroke, and the middle board suction position is generally positioned by a sensor. The sensor is prone to deviation after long-term use, causing the adsorption table to be too close to the PCB board when adsorbing the PCB board, and the adsorption table squeezes the PCB board, causing damage to the PCB board.

[0003] Therefore, it is necessary to provide a handling device and a corresponding PCB appearance inspection device to solve the above technical problems. Utility Model Content

[0004] The utility model provides a handling device and corresponding PCB appearance detection equipment, the positioning structure of which is simple and accurate, and the PCB board will not be damaged due to excessive downward movement of the adsorption table.

[0005] The technical solution of the utility model is:

[0006] A transport device is used to transport a PCB board on a lower conveying device to a discharging device, and the transport device comprises:

[0007] A platform is arranged in a horizontal direction;

[0008] An adsorption platform is arranged in the horizontal direction and is vertically slidably arranged above the platform. The bottom surface of the adsorption platform is provided with adsorption holes. The adsorption platform includes a lifting position, a plate adsorption position and a plate placement position arranged in sequence from top to bottom on its sliding track.

[0009] The limit assembly comprises a limit plate and a limit mechanism; the limit plate is arranged vertically and connected to the adsorption platform, the limit plate is provided with a limit hole, the axial direction of the limit hole is consistent with the thickness direction of the limit plate; the limit mechanism comprises a telescopic rod, the telescopic rod is telescopically arranged along the axial direction of the limit hole, the diameter of the telescopic rod is smaller than the vertical dimension of the limit hole, and the telescopic rod comprises an extended position and a retracted position in its moving direction; when the telescopic rod is located at the extended position, the telescopic rod is penetrated through the limit hole; when the telescopic rod is located at the retracted position, the telescopic rod is disengaged from the limit hole; when the adsorption platform moves from the jacking position to the plate suction position, the telescopic rod is located at the extended position, and the telescopic rod abuts against the top of the limit hole to limit the movement of the adsorption platform toward the plate placing position; and

[0010] A transport driver is connected to the adsorption platform and is used to drive the adsorption platform to move vertically.

[0011] In the transport device described in the utility model, the transport device also includes a fixed table, which is connected to the platform and located above the adsorption table. The limiting mechanism and the transport driver are both arranged on the top surface of the fixed table, and the limiting plate is movably penetrated through the fixed table.

[0012] In the handling device described in the utility model, a through hole is provided on the fixed table, and the handling device also includes a limiting structure, the limiting structure includes a limiting rod and a limiting plate, the limiting rod is vertically movably arranged in the through hole, the bottom end of the limiting rod is connected to the adsorption table, and the top end thereof is connected to the limiting plate, and when the adsorption table is located in the board placing position, the limiting plate abuts against the top of the fixed table.

[0013] In the handling device described in the utility model, the handling device also includes a compression spring, which is sleeved on the limiting rod, one end of the compression spring abuts against the top surface of the fixed platform, and the other end abuts against the limiting plate.

[0014] In the handling device described in the utility model, the fixed platform includes a table top and a limiting cylinder, the through hole is located on the table top, the limiting cylinder is arranged at the through hole, the limiting rod is passed through the limiting cylinder, and when the adsorption platform is located at the plate placing position, the limiting plate abuts against the top end of the limiting cylinder, and the compression spring is sleeved on the limiting cylinder.

[0015] In the handling device described in the utility model, the limiting cylinder is detachably placed at the through hole, and the limiting sheet is threadedly connected to the limiting rod.

[0016] In the handling device described in the utility model, a protruding mounting piece is provided at the bottom of the limiting cylinder, the limiting cylinder is penetrated through the through hole, and the mounting piece is connected to the bottom surface of the table top by screws.

[0017] In the transport device of the present invention, the limiting plate is located between the limiting mechanism and the transport driver.

[0018] In the handling device described in the utility model, the limiting mechanism is a telescopic cylinder or a telescopic motor.

[0019] Another technical solution of the utility model is:

[0020] A PCB appearance inspection device, comprising:

[0021] The above-mentioned handling device;

[0022] a discharging device, which is disposed on the platform and located below the adsorption platform; and

[0023] The lower conveying device includes a lower adsorption plate, which is slidably arranged on the platform in a transverse direction. The lower adsorption plate includes an upper material position and a lower material position on its moving trajectory. When the lower adsorption plate is located at the lower material position, the lower adsorption plate is located above the discharging device, and the telescopic rod is located at the extended position. When the lower adsorption plate is located at the upper material position, the lower adsorption plate is located on one side of the discharging device in a transverse direction.

[0024] Compared with the prior art, the utility model has the following beneficial effects: the handling device and PCB appearance inspection equipment of the utility model, the adsorption platform is initially in the jacking position, the telescopic rod is in the extended position, the telescopic rod is located in the limiting hole, after the conveying device is located below the adsorption platform, the adsorption platform moves down to the board suction position, and sucks the PCB board, at this time the telescopic rod abuts against the top of the limiting hole, and then the adsorption platform moves up again back to the jacking position, then the telescopic rod moves to the retracted position, the telescopic rod is separated from the limiting hole, and then the adsorption platform moves down to the board placement position, and the PCB board is placed on the discharge device. When the telescopic rod is outside the limiting hole, the telescopic rod will not limit the stroke of the adsorption platform, and the adsorption platform can move freely vertically; when the telescopic rod is located in the limiting hole, the stroke of the adsorption platform can be effectively limited, and the adsorption platform is accurately positioned in the adsorption position by the abutment of the telescopic rod and the top of the limiting hole. Its positioning structure is simple and accurate, and the PCB board will not be damaged due to excessive downward movement of the adsorption platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. The drawings described below are only drawings corresponding to some embodiments of the utility model.

[0026] Figure 1 A schematic diagram of the top structure of a PCB appearance inspection device provided in a preferred embodiment of the utility model.

[0027] Figure 2 The present invention is a schematic diagram of the overall structure of a PCB appearance inspection device provided in a preferred embodiment of the present invention.

[0028] Figure 3 This is one of the structural schematic diagrams of the transport device provided in the preferred embodiment of the utility model.

[0029] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of part A.

[0030] Figure 5 The second structural schematic diagram of the transport device provided in the preferred embodiment of the utility model.

[0031] Figure 6 for Figure 5 Schematic diagram of the enlarged structure of part B.

[0032] Figure 7 The third structural schematic diagram of the transport device provided for the preferred embodiment of the utility model.

[0033] in,

[0034] 11. Handling device,

[0035] 111, platform, 1111, feeding area, 1112, middle area, 1113, discharging area,

[0036] 112. Adsorption table,

[0037] 113. Limiting components,

[0038] 1131, limit plate, 11311, limit hole,

[0039] 1132, limit mechanism, 11321, telescopic rod,

[0040] 114. Transport drive,

[0041] 115, fixed table, 1151, table top, 1152, limit cylinder,

[0042] 116, limit structure, 1161, limit rod, 1162, limit sheet,

[0043] 117. Compression spring,

[0044] 12. Discharging device,

[0045] 13. Lower adsorption plate,

[0046] 14. Feeding device,

[0047] 15. Upper adsorption board,

[0048] 16.CCD camera.

[0049] In the figures, structurally similar elements are denoted by the same reference numerals. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0051] Directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", "top" and "bottom", are only used for reference to the directions of the drawings. The directional terms used are used to illustrate and understand the present invention, and are not used to limit the present invention.

[0052] The words "first", "second" and the like in the terminology of the present invention are used for descriptive purposes only and should not be understood as indicating or implying relative importance, and should not be construed as limiting the order of precedence.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In the handling device in the prior art, the uppermost lifting position and the lowermost board placing position of the adsorption table are generally controlled by stroke, and the middle board suction position is generally positioned by a sensor. The sensor is prone to deviation after long-term use, causing the adsorption table to be too close to the PCB board when adsorbing the PCB board, and the adsorption table squeezes the PCB board, causing damage to the PCB board.

[0055] The following is a preferred embodiment of a handling device and a corresponding PCB appearance inspection device provided by the utility model that can solve the above technical problems.

[0056] Please refer to Figure 1-Figure 7The preferred embodiment of the utility model provides a transport device 11 for transporting the PCB board on the lower conveying device to the discharge device 12. The transport device 11 includes a platform 111, an adsorption platform 112, a limit assembly 113 and a transport driver 114. The platform 111 is arranged in the horizontal direction. The adsorption platform 112 is arranged in the horizontal direction and is arranged above the platform 111 along the vertical sliding direction. The bottom surface of the adsorption platform 112 is provided with a suction hole. The adsorption platform 112 includes a top-up position, a plate suction position and a plate placement position arranged from top to bottom on its sliding track. The limit assembly 113 includes a limit plate 1131 and a limit mechanism 1132. The limit plate 1131 is arranged in the vertical direction and is connected to the adsorption platform 112. The limit hole 11311 is provided on the limit plate 1131, and the axial direction of the limit hole 11311 is consistent with the thickness direction of the limit plate 1131. The limiting mechanism 1132 includes a telescopic rod 11321, which is telescopically arranged along the axial direction of the limiting hole 11311. The diameter of the telescopic rod 11321 is smaller than the vertical dimension of the limiting hole 11311, and the telescopic rod 11321 includes an extended position and a retracted position in its moving direction. When the telescopic rod 11321 is in the extended position, the telescopic rod 11321 is inserted into the limiting hole 11311. When the telescopic rod 11321 is in the retracted position, the telescopic rod 11321 is disengaged from the limiting hole 11311. When the adsorption platform 112 moves from the jacking position to the plate suction position, the telescopic rod 11321 is in the extended position, and the telescopic rod 11321 abuts against the top of the limiting hole 11311, which is used to limit the adsorption platform 112 from moving toward the plate placement position. The transport driver 114 is connected to the adsorption platform 112, and is used to drive the adsorption platform 112 to move vertically. Figure 1 In the diagram, the x direction is the horizontal direction, the y direction is the longitudinal direction, and the direction perpendicular to the x and y directions is the vertical direction. Figure 3 In the embodiment, the adsorption platform 112 is located at the jacking position. Figure 5 In the figure, the adsorption platform 112 is located at the adsorption plate position. Figure 7 In the embodiment, the adsorption platform 112 is located at the board placement position.

[0057] The handling device 11 of the utility model, its adsorption platform 112 is initially in the jacking position, the telescopic rod 11321 is in the extended position, the telescopic rod 11321 is located in the limiting hole 11311, and after the lower conveying device is located below the adsorption platform 112, the adsorption platform 112 moves down to the board suction position and sucks the PCB board, at this time the telescopic rod 11321 abuts against the top of the limiting hole 11311, and then the adsorption platform 112 moves up again back to the jacking position, then the telescopic rod 11321 moves to the retracted position, the telescopic rod 11321 disengages from the limiting hole 11311, and then the adsorption platform 112 moves down to the board placement position, and the PCB board is placed on the discharge device 12. When the telescopic rod 11321 is located outside the limiting hole 11311, the telescopic rod 11321 will not limit the stroke of the adsorption platform 112, and the adsorption platform 112 can move freely in the vertical direction; when the telescopic rod 11321 is located in the limiting hole 11311, the stroke of the adsorption platform 112 can be effectively limited, and the adsorption platform 112 can be accurately positioned at the suction board position through the abutment cooperation between the telescopic rod 11321 and the top of the limiting hole 11311. The positioning structure is simple and accurate, and the PCB board will not be damaged due to excessive downward movement of the adsorption platform 112.

[0058] Please refer to Figure 3 The transport device 11 further includes a fixed platform 115, which is connected to the platform 111 and is located above the adsorption platform 112. The limiting mechanism 1132 and the transport driver 114 are both arranged on the top surface of the fixed platform 115, and the limiting plate 1131 is movably arranged on the fixed platform 115. With this structure, the vertical movement of the adsorption platform 112 can be free from the influence of the limiting mechanism 1132 and the transport driver 114.

[0059] Please continue to refer to Figure 3 , the limiting plate 1131 is located between the limiting mechanism 1132 and the transport driver 114. With this structure, the space between the limiting mechanism 1132 and the transport driver 114 can be fully utilized to prevent the movement of the limiting plate 1131 from being disturbed by other objects.

[0060] Please refer to Figure 3 , Figure 5 and Figure 7 , a through hole is provided on the fixed platform 115. The transport device 11 also includes a limiting structure 116, and the limiting structure 116 includes a limiting rod 1161 and a limiting plate 1162. The limiting rod 1161 is vertically movably arranged in the through hole, and the bottom end of the limiting rod 1161 is connected to the adsorption platform 112, and the top end thereof is connected to the limiting plate 1162. When the adsorption platform 112 is located in the board placing position, the limiting plate 1162 abuts against the top of the fixed platform 115. With this structure, when the limiting plate 1162 abuts against the top of the fixed platform 115, the adsorption platform 112 is located in the board placing position, and the downward stroke of the transport driver 114 is not required.

[0061] Please continue to refer to Figure 3 , Figure 5 and Figure 7 The handling device 11 further includes a compression spring 117, which is sleeved on the limiting rod 1161, one end of the compression spring 117 abuts against the top surface of the fixing platform 115, and the other end abuts against the limiting piece 1162. With this structure, when the adsorption platform 112 moves from the jacking position to the board suction position, and from the jacking position to the board placement position, the resilience of the compression spring 117 gives the adsorption platform 112 an upward pulling force, which plays a buffering role when the adsorption platform 112 moves downward, thereby avoiding damage to the PCB board, the adsorption platform 112 and the discharge device 12.

[0062] Please continue to refer to Figure 3 , Figure 5 and Figure 7 The fixing platform 115 includes a table 1151 and a limiting cylinder 1152. The through hole is located on the table 1151. The limiting cylinder 1152 is arranged at the through hole. The limiting rod 1161 is passed through the limiting cylinder 1152. When the adsorption platform 112 is located at the plate placing position, the limiting piece 1162 abuts against the top of the limiting cylinder 1152, and the compression spring 117 is sleeved on the limiting cylinder 1152. With the above structure, when the limiting piece 1162 abuts against the limiting cylinder 1152, the deformation of the compression spring 117 reaches the maximum value, which can avoid excessive compression of the compression spring 117, causing it to be unable to rebound.

[0063] Please refer to Figure 3 , the limiting cylinder 1152 can be detachably placed at the perforation, and the limiting piece 1162 is threadedly connected to the limiting rod 1161. When the thickness of the PCB board changes, the height of the board placement position relative to the table 1151 also changes, so the height of the limiting cylinder 1152 should also be different. With the above structure, the limiting piece 1162 can be separated from the limiting rod 1161, and then the limiting cylinder 1152 matching the thickness of the PCB board can be replaced.

[0064] Please continue to refer to Figure 3 The bottom of the limiting cylinder 1152 is provided with a protruding mounting piece, the limiting cylinder 1152 is inserted into the through hole, and the mounting piece is connected to the bottom surface of the table 1151 by screws. With this structure, when installing the limiting cylinder 1152, the limiting cylinder 1152 can be inserted into the through hole, and then the mounting piece is connected to the bottom surface of the table 1151 by screws, so that the limiting cylinder 1152 and the table 1151 are conveniently connected and firmly connected.

[0065] The limiting mechanism 1132 is a telescopic cylinder or a telescopic motor. With this structure, it is convenient to control the telescopic rod 11321 to automatically telescope.

[0066] Please refer to Figure 1 and Figure 2The preferred embodiment of the utility model also provides a PCB appearance inspection device, which includes the above-mentioned handling device 11, the discharging device 12 and the lower conveying device. The platform 111 is divided into a feed area 1111, an intermediate area 1112 and a discharging area 1113 arranged in sequence along the horizontal direction. The discharging device 12 is arranged above the discharging area 1113 and is located below the adsorption platform 112. The lower conveying device includes a lower adsorption plate 13, and the top of the lower adsorption plate 13 is provided with adsorption holes. The lower adsorption plate 13 is slidably arranged above the intermediate area 1112 and the discharging area 1113, and the lower adsorption plate 13 includes an upper material position and a lower material position on its moving trajectory. When the lower adsorption plate 13 is located at the lower material position, the lower adsorption plate 13 is located above the discharging area 1113 and above the discharging device 12, and the telescopic rod 11321 is located in the extended position; when the lower adsorption plate 13 is located at the upper material position, the lower adsorption plate 13 is located on one side of the discharging device 12, that is, above the middle area 1112.

[0067] The PCB appearance inspection equipment also includes a feeding device 14, an upper conveying device and two groups of CCD cameras 16. Upper conveying device. The feeding device 14 is arranged above the feeding area 1111, and is used to convey the PCB board to a designated position. The upper conveying device includes an upper adsorption plate 15, and an adsorption hole is arranged at the bottom of the upper adsorption plate 15. The upper adsorption plate 15 is slidably arranged above the feeding area 1111 and the middle area 1112. When the upper adsorption plate 15 and the lower adsorption plate 13 are both located above the middle area 1112, the upper adsorption plate 15 is located above the lower adsorption plate 13. One group of CCD cameras 16 is arranged between the feeding area 1111 and the middle area 1112, and is used to detect the appearance of the lower surface of the PCB board; another group of CCD cameras 16 is arranged between the middle area 1112 and the discharging area 1113, and is used to detect the appearance of the upper surface of the PCB board.

[0068] The working process of the PCB appearance inspection device of the preferred embodiment of the utility model is as follows:

[0069] 1. The feeding device 14 transports the PCB board to the designated position;

[0070] 2. The upper adsorption plate 15 moves to the top of the feeding area 1111, sucks up the PCB board and moves to the top of the middle area 1112. During the movement, a group of CCD cameras 16 located between the feeding area 1111 and the middle area 1112 perform appearance inspection on the lower surface of the PCB board;

[0071] 3. The lower adsorption plate 13 moves to the top of the middle area 1112, the upper adsorption plate 15 turns off the suction, and the lower adsorption plate 13 turns on the suction. The PCB is transferred from the upper adsorption plate 15 to the lower adsorption plate 13, and the lower adsorption plate 13 moves to the top of the discharge area 1113. During the movement, a group of CCD cameras 16 located between the middle area 1112 and the discharge area 1113 perform appearance inspection on the upper surface of the PCB.

[0072] 4. The adsorption table 112 moves down from the jacking position to the plate suction position to get close to the PCB board, the lower adsorption plate 13 turns off the suction, the adsorption table 112 turns on the suction, the adsorption table 112 sucks the PCB board, and then the adsorption table 112 moves up again back to the jacking position, then the telescopic rod 11321 moves to the retracted position, the lower adsorption plate 13 moves to the top of the middle area 1112, the adsorption table 112 moves down to the board placement position to get close to the discharge device 12, the adsorption table 112 turns off the suction, and places the PCB board on the discharge device 12.

[0073] This completes the working process of the PCB appearance inspection device of this preferred embodiment.

[0074] The handling device and PCB appearance inspection equipment of the utility model are characterized in that the adsorption platform is initially in the jacking position, the telescopic rod is in the extended position, and the telescopic rod is located in the limiting hole. After the conveying device is located below the adsorption platform, the adsorption platform moves down to the board suction position and sucks the PCB board. At this time, the telescopic rod abuts against the top of the limiting hole, and then the adsorption platform moves up again back to the jacking position, and then the telescopic rod moves to the retracted position, the telescopic rod is separated from the limiting hole, and then the adsorption platform moves down to the board placement position, and the PCB board is placed on the discharge device. When the telescopic rod is outside the limiting hole, the telescopic rod will not limit the stroke of the adsorption platform, and the adsorption platform can move freely vertically; when the telescopic rod is located in the limiting hole, the stroke of the adsorption platform can be effectively limited, and the adsorption platform is accurately positioned in the adsorption position through the abutment of the telescopic rod and the top of the limiting hole. Its positioning structure is simple and accurate, and the PCB board will not be damaged due to excessive downward movement of the adsorption platform.

[0075] To sum up, although the present invention has been disclosed as above in the form of preferred embodiments, the protection scope of the present invention is not limited thereto, and any technician familiar with the technical field can make equivalent substitutions or changes within the technical scope disclosed by the present invention according to the concept of the technical solution of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A transport device, characterized in that: Used to transport the PCB board on the lower conveying device to the discharging device, the transporting device includes: A platform is arranged in a horizontal direction; An adsorption platform is arranged in the horizontal direction and is vertically slidably arranged above the platform. The bottom surface of the adsorption platform is provided with adsorption holes. The adsorption platform includes a lifting position, a plate adsorption position and a plate placement position arranged in sequence from top to bottom on its sliding track. The limit assembly comprises a limit plate and a limit mechanism; the limit plate is arranged vertically and connected to the adsorption platform, the limit plate is provided with a limit hole, the axial direction of the limit hole is consistent with the thickness direction of the limit plate; the limit mechanism comprises a telescopic rod, the telescopic rod is telescopically arranged along the axial direction of the limit hole, the diameter of the telescopic rod is smaller than the vertical dimension of the limit hole, and the telescopic rod comprises an extended position and a retracted position in its moving direction; when the telescopic rod is located at the extended position, the telescopic rod is penetrated through the limit hole; when the telescopic rod is located at the retracted position, the telescopic rod is disengaged from the limit hole; when the adsorption platform moves from the jacking position to the plate suction position, the telescopic rod is located at the extended position, and the telescopic rod abuts against the top of the limit hole to limit the movement of the adsorption platform toward the plate placing position; and A transport driver is connected to the adsorption platform and is used to drive the adsorption platform to move vertically.

2. The transport device according to claim 1, characterized in that: The transport device also includes a fixed table, which is connected to the platform and located above the adsorption table. The limiting mechanism and the transport driver are both arranged on the top surface of the fixed table, and the limiting plate is movably arranged on the fixed table.

3. The transport device according to claim 2, characterized in that: The fixed platform is provided with a through hole, and the transport device also includes a limiting structure, which includes a limiting rod and a limiting plate. The limiting rod is vertically movably arranged in the through hole, the bottom end of the limiting rod is connected to the adsorption platform, and the top end of the limiting rod is connected to the limiting plate. When the adsorption platform is located at the board placing position, the limiting plate abuts against the top of the fixed platform.

4. The transport device according to claim 3, characterized in that: The transport device further comprises a compression spring which is sleeved on the limiting rod. One end of the compression spring abuts against the top surface of the fixing platform, and the other end abuts against the limiting sheet.

5. The transport device according to claim 4, characterized in that: The fixed platform includes a table top and a limiting cylinder, the through hole is located on the table top, the limiting cylinder is arranged at the through hole, the limiting rod is passed through the limiting cylinder, when the adsorption platform is located at the plate placing position, the limiting plate abuts against the top end of the limiting cylinder, and the compression spring is sleeved on the limiting cylinder.

6. The transport device according to claim 5, characterized in that: The limiting cylinder is detachably placed at the through hole, and the limiting sheet is threadedly connected to the limiting rod.

7. The transport device according to claim 6, characterized in that: A protruding mounting piece is arranged at the bottom of the limiting cylinder, the limiting cylinder is penetrated through the through hole, and the mounting piece is connected to the bottom surface of the table top by screws.

8. The transport device according to claim 1, characterized in that: The limiting plate is located between the limiting mechanism and the transport driver.

9. The transport device according to any one of claims 1 to 8, characterized in that: The limiting mechanism is a telescopic cylinder or a telescopic motor.

10. A PCB appearance inspection device, characterized in that: include: The transport device according to any one of claims 1 to 9; a discharging device, which is disposed on the platform and located below the adsorption platform; and The lower conveying device includes a lower adsorption plate, which is slidably arranged on the platform in a transverse direction. The lower adsorption plate includes an upper material position and a lower material position on its moving trajectory. When the lower adsorption plate is located at the lower material position, the lower adsorption plate is located above the discharging device, and the telescopic rod is located at the extended position. When the lower adsorption plate is located at the upper material position, the lower adsorption plate is located on one side of the discharging device in a transverse direction.

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