PCB thickness measuring mechanism

Abstract

The utility model relates to the technical field of PCB (Printed Circuit Board) detection, in particular to a PCB thickness measuring mechanism, which comprises a conveying belt assembly, a compression roller assembly and a detection assembly, the pressing roller assembly is transversely arranged on the conveying belt assembly, the pressing roller assembly can vertically ascend and descend relative to the conveying belt assembly, and the detection assembly is arranged above one side of the pressing roller assembly; according to the PCB thickness measuring mechanism provided by the utility model, the pressing roller assembly can uniformly press the PCB through the dead weight so that the PCB can be tightly attached to the surface of the conveying belt assembly without bumping, and meanwhile, the PCB thickness measuring mechanism also has the function of flattening and resetting the PCB with slight curvature; therefore, the PCB is tightly attached to the surface of the conveying belt in the conveying process, the accuracy of PCB thickness data collected by the detection assembly is higher, the subsequent production process is not affected, and the yield is increased.

Description

Technical Field

[0001] This utility model relates to the field of PCB board inspection technology, specifically to a PCB board thickness measuring mechanism. Background Technology

[0002] Circuit boards (PCBs) are the most in-demand board components in the electronics manufacturing industry. When PCBs are put into production line manufacturing, the thickness of the PCB needs to be measured at the thickness measurement station before entering the AOI (Automated Optical Inspection) station for appearance inspection. The thickness measurement station in the existing equipment consists of a conveyor line and a displacement laser. The displacement laser is installed above the corresponding position of the conveyor line through a bracket to form the thickness measurement station. When the PCB is conveyed to the displacement laser by the conveyor belt, the displacement laser directly reads the thickness of the PCB and completes the thickness measurement data acquisition.

[0003] In practical applications, the lack of a clamping and limiting mechanism causes the PCB board to bounce when the conveyor belt is transporting it. The height of the PCB board above the surface of the conveyor belt often changes and is not fixed. This leads to unstable and inaccurate readings of the PCB board thickness by the displacement laser, which in turn has a significant impact on subsequent production processes and reduces the yield rate. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a PCB board thickness measurement mechanism.

[0005] The technical solution of this utility model is as follows:

[0006] This utility model provides a PCB board thickness measurement mechanism, including a conveyor belt assembly, a pressure roller assembly, and a detection assembly; the pressure roller assembly is horizontally disposed on the conveyor belt assembly, and the pressure roller assembly can be vertically raised and lowered relative to the conveyor belt assembly; the detection assembly is disposed above one side of the pressure roller assembly.

[0007] Furthermore, the pressing roller assembly includes a lifting frame, a roller shaft, a lifting wheel, a pressing roller, and a detection wheel; the inner side of the lifting frame has a vertically formed lifting groove, and two lifting frames are symmetrically arranged on both sides of the conveyor belt assembly; both ends of the roller shaft are provided with lifting wheels that are movably engaged with the corresponding lifting grooves; a pressing roller is provided in the middle of the roller shaft; and detection wheels are fitted on both ends of the roller shaft between the pressing roller and the corresponding lifting wheel.

[0008] Furthermore, multiple pressing rollers are equidistantly distributed along the length of the roller shaft at the middle.

[0009] Furthermore, several hollowed-out sections are evenly distributed along the circumference on the side of the pressing roller.

[0010] Furthermore, the detection component includes a detection bracket and a detection sensor. The detection bracket is located directly above the lifting frame, and the detection sensor is located on the inner side of the top of the detection bracket, directly above the detection wheel, with the detection end of the detection sensor facing the detection wheel.

[0011] Furthermore, the detection sensor is a displacement laser sensor.

[0012] Furthermore, it also includes an interception assembly consisting of an interception seat, a rotating shaft, connecting parts, and an interception rod; two interception seats are symmetrically arranged on both sides of the output end of the conveyor belt assembly, the two ends of the rotating shaft are rotatably connected to the corresponding interception seats, and the interception rod is fixed on the rotating shaft through several connecting parts, and the interception rod, the rotating shaft, and the conveyor belt assembly remain parallel.

[0013] Furthermore, the interception component is connected to an external alarm.

[0014] Furthermore, mounting brackets are fixedly provided on both sides of the bottom surface of the conveyor belt assembly.

[0015] Furthermore, the conveyor belt assembly has a tensioning structure.

[0016] The beneficial effects achieved by this utility model are as follows:

[0017] The PCB board thickness measuring mechanism provided by this utility model uses a pressure roller assembly to uniformly press the PCB board against the surface of the conveyor belt assembly by its own weight, preventing it from bumping. It also has a flattening and resetting function for PCB boards with slight curvature. As a result, the PCB board is kept close to the surface of the conveyor belt during the conveying process, and the thickness data of the PCB board collected by the detection assembly is more accurate, without affecting subsequent production processes, thus improving the yield rate. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of the entire utility model.

[0019] Figure 2 yes Figure 1 Enlarged view of point A.

[0020] Figure 3 yes Figure 1 Enlarged view of point B. Detailed Implementation

[0021] To facilitate understanding of this utility model by those skilled in the art, the specific embodiments of this utility model are clearly described below with reference to the accompanying drawings. Obviously, the specific embodiments described are merely preferred embodiments of this utility model, and not all embodiments.

[0022] Example 1:

[0023] like Figure 1-3 As shown, this utility model provides a PCB board thickness measuring mechanism for accurately testing the thickness of PCB boards. It includes a conveyor belt assembly 1 for transporting the PCB board, a pressing roller assembly 2 for pressing the PCB board tightly against the surface of the conveyor belt assembly 1, and a detection assembly 3 for detecting the thickness of the PCB board. The pressing roller assembly 2 is horizontally positioned on the conveyor belt assembly 1 and can vertically move up and down relative to the conveyor belt assembly 1. The detection assembly 3 is located above one side of the pressing roller assembly 2. The actual thickness of the PCB board can be determined by detecting the vertical movement distance of the pressing roller assembly 2. The detection assembly 3 is electrically connected to an external control system.

[0024] The pressing roller assembly 2 includes a lifting frame 21, a roller shaft 22, lifting rollers 23, pressing rollers 24, and detection rollers 25. The inner side of the lifting frame 21 has a vertically formed lifting groove 211. Two lifting frames 21 are symmetrically bolted to both sides of the conveyor belt assembly 1. The roller shaft 22 is located between the two lifting frames 21, and both ends of it are provided with lifting rollers 23 that movably cooperate with the corresponding lifting grooves 211. A pressing roller 24 for pressing the PCB board is provided in the middle of the roller shaft 22. Detection rollers 25 are sleeved at both ends of the roller shaft 22 between the pressing roller 24 and the corresponding lifting roller 23. This enables the pressing of the PCB board... The PCB board pressing and conveying function works as follows: During operation, the pressing rollers are driven to rotate in the opposite direction by the conveyor belt assembly. When the PCB board comes into contact with the pressing roller assembly along the conveyor belt assembly, the pressing rollers rise along the lifting groove via the lifting wheel on the roller shaft. The pressing rollers and the conveyor belt assembly work together to clamp the PCB board, allowing the PCB board to continue to be conveyed while the pressing roller assembly uses its own weight to press the PCB board until the PCB board has completely passed through the pressing rollers and then descends to its original position. During this process, the PCB board is pressed tightly against the surface of the conveyor belt. The detection component measures the rising height of the detection wheel to obtain an accurate PCB board thickness.

[0025] Specifically, before use, the outer periphery of the pressure roller assembly contacts and engages with the upper surface of the conveyor belt. At this time, the distance between the detection end of the detection component and the surface of the detection wheel is 0 when the operator calibrates the detection component. When in use, for example, a 2CM PCB board passes through the pressure roller assembly, and the detection wheel can rise 2CM along the lifting groove under the drive of the roller shaft and the lifting wheel. At this time, the distance between the detection end of the detection sensor and the detection wheel changes, and the measured data is 2CM.

[0026] During normal use, the acceptable thickness range of the PCB board needs to be set in the external control system. When the thickness of the PCB board passing through is abnormal (such as excessive curvature, excessive thickness, or excessive thickness), the detection component will detect that the data of the rising distance of the pressure roller assembly is too large or too small, and promptly feed back to the external control system. The external control system will stop the working status of the mechanism and issue an alarm to prompt the staff to confirm the abnormality.

[0027] Multiple pressing rollers 24 are evenly distributed along the length of the roller shaft 22 in the middle section; they uniformly press the PCB board, which can flatten and restore the PCB board with slight curvature, while avoiding the problem of uneven pressing causing the curved side of the PCB board to lift up, thus affecting the operation of the mechanism.

[0028] The pressing roller 24 has several hollowed-out portions 24a evenly distributed along its circumference on its side surface; these are used to reduce the weight of the pressing roller and avoid damaging the PCB board.

[0029] The detection component 3 includes a detection bracket 31 and a detection sensor 32. The bottom end of the detection bracket 31 is bolted to be directly above any of the lifting frames 21. The detection sensor 32 is bolted to the inner side of the top end of the detection bracket 31, directly above the detection wheel 25. The detection end of the detection sensor 32 faces the detection wheel 25. It is used to collect the height data of the detection wheel moving up and down along the lifting frame in real time and accurately, so as to obtain the accurate thickness of the PCB board being tested, reduce the processing error of the PCB board in subsequent workstations, improve the overall processing accuracy, and increase the yield rate.

[0030] In this embodiment, the detection sensor 32 is preferably a displacement laser sensor; it has high precision and improves the accuracy of PCB board thickness data acquisition.

[0031] Example 2:

[0032] like Figure 1-3As shown, the PCB board thickness measuring mechanism provided by this utility model also includes an interception assembly 4 composed of an interception seat 41, a rotating shaft 42, connecting parts 43, and an interception rod 44. Two interception seats 41 are symmetrically bolted to both sides of the output end of the conveyor belt assembly 1. The interception seats 41 are electrically connected to an external control system. The rotating shaft 42 is located between the two interception seats 41, and its two ends are rotatably connected to the corresponding interception seats 41. The interception rod 44 is fixed to the rotating shaft 42 through several connecting parts 43. The interception rod 44, the rotating shaft 42, and the conveyor belt assembly 1 remain parallel. When the PCB board thickness is unqualified (e.g., the PCB board thickness is too thick, the overall curvature of the PCB board is too large, etc.), the PCB board will not be able to pass through the interception rod and make contact with it during conveying along the conveyor belt. This causes the interception rod to rotate along its rotating shaft, causing the PCB board to tilt upwards. Simultaneously, the interception seat will promptly feed back to the external control system, which will then control the conveyor belt assembly to stop working. Conversely, when the PCB board is qualified, it can pass through the interception assembly normally and enter the next workstation for processing.

[0033] The interception component 4 is connected to an external alarm; it is used to intercept substandard PCB boards and alert staff.

[0034] Mounting brackets 11 are bolted to the bottom surfaces of both sides of the conveyor belt assembly 1 for easy installation.

[0035] The conveyor belt assembly 1 has a tensioning structure for adjusting the belt tension to facilitate the conveying of PCB boards.

[0036] The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A PCB board thickness measuring mechanism characterized by: The utility model provides a kind of conveying belt assembly (1), compaction roller assembly (2) and detection assembly (3) comprising;The compaction roller assembly (2) is transversely arranged on the conveying belt assembly (1), and the compaction roller assembly (2) can be vertically lifted relative to the conveying belt assembly (1), and the detection assembly (3) is arranged above one side of the compaction roller assembly (2).

2. The PCB thickness measuring mechanism according to claim 1, wherein: The compaction roller assembly (2) includes lifting frame (21), roller shaft (22), lifting wheel (23), compaction roller (24) and detection wheel (25);The lifting groove (211) is vertically arranged on the inner side of the lifting frame (21), and two lifting frames (21) are symmetrically arranged on the two sides of the conveying belt assembly (1) respectively, the lifting wheel (23) is movably connected to the corresponding lifting groove (211) on the two ends of the roller shaft (22), the compaction roller (24) is arranged on the middle part of the roller shaft (22), and the detection wheel (25) is sleeved on the two ends of the roller shaft (22) between the compaction roller (24) and the corresponding lifting wheel (23).

3. The PCB thickness measuring mechanism according to claim 2, wherein: A plurality of compaction rollers (24) are equidistantly arranged on the middle part of the roller shaft (22) along the length direction.

4. The PCB thickness measuring mechanism according to claim 3, wherein: A plurality of hollow parts (24a) are uniformly distributed on the side surface of the compaction roller (24) along the circumferential direction.

5. The PCB thickness measuring mechanism according to any one of claims 2-4, characterized in that: The detection assembly (3) includes detection bracket (31) and detection sensor (32), the detection bracket (31) is arranged above the lifting frame (21), the detection sensor (32) is arranged on the inner side of the top end of the detection bracket (31) above the detection wheel (25), and the detection end of the detection sensor (32) faces the detection wheel (25).

6. The PCB thickness measuring mechanism according to claim 5, wherein: The detection sensor (32) is a displacement laser sensor.

7. The PCB thickness measuring mechanism according to claim 1, wherein: It also includes an intercepting assembly (4) composed of an intercepting seat (41), a rotating shaft (42), a connecting piece (43) and an intercepting rod (44), two intercepting seats (41) are symmetrically arranged on the two sides of the output end of the conveying belt assembly (1) respectively, the rotating shaft (42) is rotatably connected to the corresponding intercepting seat (41) on the two ends, the intercepting rod (44) is fixedly arranged on the rotating shaft (42) through a plurality of connecting pieces (43), and the intercepting rod (44), the rotating shaft (42) and the conveying belt assembly (1) are parallel.

8. The PCB thickness measuring mechanism according to claim 7, wherein: The intercepting assembly (4) is connected with an external alarm.

9. The PCB thickness measuring mechanism according to claim 8, wherein: The mounting bracket (11) is fixedly arranged on the bottom surface of the conveying belt assembly (1).

10. The PCB thickness measuring mechanism according to claim 9, wherein: The conveying belt assembly (1) has a tensioning structure.

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