CN116698858B

CN116698858B - Second transmission mechanism and corresponding PCB automatic detection machine

Info

Publication number: CN116698858B
Application number: CN202310688234.9A
Authority: CN
Inventors: 陈胜鹏
Original assignee: SHENZHEN YIMEIZHI TECHNOLOGY CO LTD
Current assignee: SHENZHEN YIMEIZHI TECHNOLOGY CO LTD
Priority date: 2017-07-11
Filing date: 2017-07-11
Publication date: 2024-01-30
Anticipated expiration: 2037-07-11
Also published as: CN107202796B; CN107202796A; CN116698858A; CN116718604B; CN116718605B; CN116718604A; CN116718605A

Abstract

The application of the division scheme provides a second transmission mechanism and a corresponding automatic PCB board detection machine, wherein the automatic PCB board detection machine comprises a transmission device, a first correction mechanism and an image acquisition device, the transmission device comprises a feeding position for being transmitted into a PCB board to be detected, a first correction position for primarily correcting the PCB board to be detected and a detection position for acquiring an image of the PCB board to be detected, and the transmission device is used for sequentially transmitting the PCB board to be detected from the feeding position to the first correction position and the detection position; the first correction mechanism is used for correcting the PCB positioned at the first correction position; the image acquisition device is used for acquiring the image of the PCB positioned at the detection position. According to the invention, through the arrangement of the first correction mechanism, the transmission accuracy is improved; through conveyer's setting, improved the stability of conveying, through image acquisition device's setting, improved detection efficiency.

Description

Second transmission mechanism and corresponding PCB automatic detection machine

The application is a divisional application, and the application number of the original application is: 201710561920.4", application date is: the invention name of "2017, 07, 11 days" is: "PCB board automated inspection machine".

Technical Field

The invention relates to the field of circuit board circuit detection, in particular to a second transmission mechanism and a corresponding automatic PCB board detection machine.

Background

With the development of technology, for the inspection of PCB (printed circuit board), the requirements of manufacturers are higher and higher, such as the efficiency of inspecting the defects of PCB and the imaging quality of defect scanning.

In the existing automatic PCB detection machine, the detection efficiency is paid attention to, or the imaging quality of defect scanning is paid attention to, for example, the identification degree of the traditional AOI detection machine after imaging is not high, and misjudgment is easy to cause; for example, the existing PCB board detector can only detect one surface of the PCB board at the same time, which is a waste of detection time; or the transmission mechanism of the existing PCB board detector is easy to slip and shift in the process of transmission, so that the imaging quality and the detection efficiency are affected.

Therefore, it is necessary to provide a second transmission mechanism and a corresponding automatic PCB board inspection machine, so as to solve the above technical problems.

Disclosure of Invention

The embodiment of the invention provides a second transmission mechanism and a corresponding automatic PCB board detector, which are used for solving the technical problems of low efficiency and low scanning imaging quality of the existing automatic PCB board detector for detecting defects of a PCB board.

The invention provides a second transmission mechanism which comprises at least two upstream conveying belts, at least two downstream conveying belts, an upstream driving shaft, an upstream synchronizing shaft, a downstream driving shaft and a downstream synchronizing shaft, a second driving assembly and a first driving assembly, wherein the at least two upstream conveying belts are arranged side by side; a gap for an image acquisition device to acquire an image is arranged between the upstream conveyor belt and the downstream conveyor belt;

the upstream conveyor belts and the downstream conveyor belts are correspondingly connected one by one, and the upstream conveyor belts and the downstream conveyor belts are arranged at intervals;

the second transmission mechanism further comprises a detection position, the image acquisition device is located below the detection position and is used for acquiring an image of the PCB located at the detection position.

The invention also comprises a PCB automatic detector, which comprises the second transmission mechanism and an image acquisition device, and further comprises:

the first transmission mechanism is provided with a feeding position for being transmitted into the PCB to be tested and a first correction position for primarily correcting the PCB to be tested;

And the first correction mechanism is used for correcting the PCB positioned at the first correction position.

In the invention, the first transmission mechanism comprises a plurality of rollers which are arranged in parallel, a first driving component which drives the rollers to rotate, and a supporting piece which is used for supporting the PCB to be tested, wherein the supporting piece and the rollers are alternately arranged, and the rotating side surfaces of the rollers form a conveying plane for conveying the PCB to be tested;

the supporting piece comprises a supporting part for supporting the PCB to be tested, and the contact area of the supporting part and the PCB to be tested is overlapped with the conveying plane;

the support members are divided into a first support member having a first support portion and a second support member having a second support portion, the conveying plane includes an upstream section provided with the feed level and a downstream section provided with the first correction level, the first support member is located at the upstream section, the second support member is located at the downstream section,

the end face of the first supporting part, which faces the PCB to be tested, is a convex arc surface, the contact area of the first supporting part and the PCB to be tested is a linear area, the end face of the second supporting part, which faces the PCB to be tested, is a plane or a special-shaped surface, and the contact area of the second supporting part and the PCB to be tested is a surface area.

In the invention, the second transmission mechanism comprises at least two upstream conveyor belts arranged side by side, at least two downstream conveyor belts connected with the upstream conveyor belts, an upstream driving shaft and an upstream synchronizing shaft which are respectively arranged at two ends of the upstream conveyor belts, a downstream driving shaft and a downstream synchronizing shaft which are respectively arranged at two ends of the downstream conveyor belts, and a second driving assembly for driving the upstream driving shaft and the downstream driving shaft to rotate; a gap for the image acquisition device to acquire images is arranged between the upstream conveyor belt and the downstream conveyor belt;

the upstream conveyor belts are correspondingly connected with the downstream conveyor belts one by one, and the upstream conveyor belts and the downstream conveyor belts are arranged at intervals.

In the invention, the upstream driving shaft is arranged at the tail end of the upstream conveying belt, and the downstream driving shaft is arranged at the head end of the downstream conveying belt;

the second driving assembly comprises a gear box for driving the upstream driving shaft and the downstream driving shaft to rotate and a second motor for driving the gear box to rotate and operate, a rotating shaft of the second motor is rotationally connected with the gear box, and the gear box is rotationally connected with the upstream driving shaft and the downstream driving shaft.

In the invention, the gear box comprises a shell, a driving gear arranged in the middle of the shell, a first driven gear meshed with one side of the driving gear, a second driven gear meshed with the other side of the driving gear, a main connecting shaft fixedly connected with the driving gear, a first auxiliary connecting shaft fixedly connected with the first driven gear and a second auxiliary connecting shaft fixedly connected with the second driven gear;

the main connecting shaft is fixedly connected with the rotating shaft of the second motor through a coupler, the first auxiliary connecting shaft is fixedly connected with the upstream driving shaft through a coupler, and the second auxiliary connecting shaft is fixedly connected with the downstream driving shaft through a coupler;

the first driven gear and the second driven gear are identical in shape and size.

In the invention, the driving gear, the first driven gear and the second driven gear are arranged in an isosceles triangle form.

In the invention, the second conveying mechanism further comprises side plates arranged on two sides of the upstream conveying belt and the downstream conveying belt, and an upstream supporting plate and a downstream supporting plate fixedly arranged between the side plates;

the upstream driving shaft, the upstream synchronizing shaft, the downstream driving shaft and the downstream synchronizing shaft are all rotatably fixed on the side plates, the upstream supporting plate is positioned between the upstream driving shaft and the upstream synchronizing shaft, and the downstream supporting plate is positioned between the downstream driving shaft and the downstream synchronizing shaft;

The upstream support plate and the downstream support plate may be equal in length or unequal in length.

In the invention, the second transmission mechanism further comprises rolling shafts which are arranged at two ends of the gap and used for propping against the PCB to be tested, and the rolling shafts are rotationally connected with the top of the side plate through fixing blocks; the outer peripheral surface of the rolling shaft is coated with a flexible layer, and the distance from the flexible layer to the upstream conveyor belt and the distance from the flexible layer to the downstream conveyor belt are slightly smaller than the thickness of the PCB to be tested.

In the invention, the rolling shaft above the upstream driving shaft is offset to the upstream direction of the upstream conveyor belt and is offset to the upstream driving shaft, and the rolling shaft above the downstream driving shaft is offset to the downstream direction of the downstream conveyor belt and is offset to the downstream driving shaft.

In the present invention, the flexible layer is rubber or foam.

In the invention, the second transmission mechanism further comprises a bottom plate with an opening, two ends of the side plate are fixedly connected with the bottom plate through supporting blocks, the second driving assembly is fixedly connected with the bottom plate through a fixed base, the opening is arranged right below the gap, and the sectional area of the opening is larger than that of the gap.

In the present invention, the upstream conveyor belt and the downstream conveyor belt are substantially equal in width, each of the upstream conveyor belts is substantially equal in width, and each of the downstream conveyor belts is substantially equal in width.

In the present invention, the upstream conveyor belt and the downstream conveyor belt each have two.

In the invention, the automatic PCB board detection machine comprises a second correction mechanism for secondarily correcting the PCB board to be detected, the second transmission mechanism also comprises a second correction position which is used for secondarily correcting the PCB board to be detected and is positioned between the first correction position and the detection position, and the second correction mechanism is arranged above the second correction position;

the second correcting mechanism comprises a fixing plate which is transversely arranged, an inductor which is clamped on the fixing plate and used for inducing a PCB to be detected, a rotating shaft which is fixedly arranged on the fixing plate, a correcting component which is rotationally connected with the rotating shaft, and a driving component which drives the correcting component to rotationally lift and rotationally descend, wherein the inductor is arranged in front of the correcting component, the rotating shaft is fixedly connected with the fixing plate through a supporting seat, the correcting component extends out of the fixing plate and faces the direction of the second correcting position, and the driving component is fixedly connected with the fixing plate through a fixing component;

The correction assembly comprises a connecting piece, an extension plate and a second baffle, wherein the connecting piece is connected to the rotating shaft in a rotating mode, the extension plate is fixedly connected to the connecting piece and extends towards the second correction position, the second baffle is arranged on the extension plate in an adjustable mode and is used for blocking a PCB to be detected, and the second baffle is transmitted to the second correction position so as to correct deviation of the PCB to be detected.

In the invention, when the second correction mechanism is in a blocking state, the driving part is in a static state, the extension plate is close to the fixed plate, and the second baffle is close to a plane in which the second correction position is located;

when the second correcting mechanism is in an open state, the driving part pushes the connecting piece downwards, the connecting piece rotates upwards, the extension plate rotates upwards along with the connecting piece and is far away from the fixed plate, and the second baffle plate rotates upwards and is far away from the plane where the second correcting position is located.

In the invention, when the second correcting mechanism is in a blocking state, the longitudinal extending directions of the extending plate and the second baffle are all approximately perpendicular to the plane of the second correcting position.

In the invention, the driving component is an air cylinder, one surface of the connecting piece facing the air cylinder is convexly provided with a connecting block, and the push rod of the air cylinder is connected with the connecting block through a bolt.

In the invention, the extension plate comprises at least two heightening through holes which are arranged in parallel, the second baffle comprises a threaded column which is fixedly arranged on the second baffle and matched with the heightening through holes, the threaded column penetrates through the heightening through holes, and the second baffle is fixedly arranged on the extension plate through the threaded connection of the threaded column and a nut;

the height of the heightening through hole is larger than the outer diameter of the threaded column.

In the present invention, the cross-sectional shape of the height-adjusting through hole is a racetrack shape.

In the invention, the fixed plate comprises an opening with the same extending direction as the extending direction of the fixed plate, and the opening is arranged in front of the extending plate; the inductor comprises an inductor body and a fixing part for fixing the inductor body;

the sensor body passes through the opening and faces the second correction position, the fixing part abuts against the outer side of the opening, and the width of the fixing part is larger than that of the opening.

In the invention, the opening is in a strip-shaped runway shape.

In the invention, the rotating shafts are arranged at two ends of the fixed plate, the extending plate is fixedly connected between the connecting pieces, and the opening is positioned between the connecting pieces.

In the invention, the height of the fixed plate from the second correction position is slightly larger than the thickness of the PCB to be tested.

In the invention, at least two grooves which are arranged side by side are arranged on one side of the fixing plate, which faces the extending plate, the notch of each groove faces the extending plate, the grooves are fixedly arranged in the buffer blocks, and the buffer blocks slightly extend out of the notch of each groove.

In the invention, the detection bits comprise a first detection bit for detecting the back surface of the PCB to be detected and a second detection bit for detecting the front surface of the PCB to be detected, wherein the first detection bit is arranged at the gap, and the second detection bit is arranged at the downstream of the first detection bit; the image acquisition device comprises a first image acquisition mechanism positioned below the first detection position and a second image acquisition mechanism positioned above the second detection position;

the first image acquisition mechanism comprises a first CCD assembly for acquiring a PCB image to be detected and a first lamp box for providing a light source for the first CCD assembly; the second image acquisition mechanism comprises a second CCD assembly for acquiring the PCB image to be detected and a second lamp box for providing a light source for the second CCD assembly.

In the invention, the second image acquisition mechanism further comprises a thickness sensor for sensing the thickness of the PCB to be tested, and the thickness sensor is positioned upstream of the first detection position.

In the invention, the automatic PCB board detector further comprises a laser marker arranged at the upstream of the first detection position.

In the invention, the automatic PCB board detection machine further comprises a control system electrically connected with the transmission device, the image acquisition device, the first correction mechanism and the second correction mechanism, and the control system is arranged right below the first correction mechanism.

Compared with the prior art, the PCB automatic detector has the beneficial effects that: in the automatic PCB detection machine, the roller conveying mode of the first conveying mechanism reduces the cost; the convex arc of the first supporting piece faces to the support of the PCB to be tested, and the stability of the conveying of the PCB to be tested is improved on the premise of ensuring the conveying efficiency of the first conveying mechanism; the arrangement of the abnormal surface of the second supporting piece further improves the stability of the PCB to be tested and greatly reduces the possibility of larger deflection of the PCB to be tested after primary correction, and the first supporting piece and the second supporting piece are arranged to avoid the situation that foreign objects fall into the accommodating space of the first correction mechanism to cause unstable operation of the first correction mechanism;

The first correcting mechanism corrects the conveying path of the PCB to be detected, so that the PCB to be detected can be accurately conveyed to the first detecting position and the second detecting position; the trigger sensor is arranged to the reset sensor, so that the characteristic of multistage deceleration is realized, the PCB to be tested is well protected, and the damage condition of the PCB is avoided;

the second conveying mechanism adopts the interval arrangement of the upstream conveying belt and the interval arrangement of the downstream conveying belt, so that the defect that the conveying belt is easy to slip due to large amplitude is avoided, and the conveying stability is improved; the rolling shaft is arranged to slightly roll the PCB to be tested, so that the whole plane of the PCB to be tested is stably transited from the upstream conveyor belt to the downstream conveyor belt;

the second correcting mechanism is used for further correcting the transmission precision of the PCB to be detected, so that the PCB to be detected can accurately enter and exit the range of the first detection position and the range of the second detection position, and the quality of image acquisition is improved;

the first image acquisition mechanism and the second image acquisition mechanism are arranged in a staggered manner, so that the detection and marking treatment of the front surface and the back surface of the PCB to be detected are realized in one-time transmission detection, and the detection efficiency of the PCB to be detected is improved; the technical problems that the PCB automatic detector in the prior art has low efficiency for detecting defects of a PCB and is unstable in conveying the PCB and easy to deviate are solved.

Drawings

Fig. 1 is a schematic front view of a preferred embodiment of an automatic PCB board inspection machine according to the present invention;

fig. 2 is a schematic diagram showing a combined front perspective structure of a first transmission structure and a first correction mechanism of a preferred embodiment of the automatic PCB board inspection machine of the present invention;

FIG. 3 is a schematic diagram of a combined top view of a first transfer structure and a first calibration mechanism of a preferred embodiment of the PCB automatic inspection machine of the present invention;

FIG. 4 is a schematic diagram showing a combined front view of a first transfer mechanism and a first calibration mechanism of a preferred embodiment of the automatic PCB board inspection machine of the present invention;

FIG. 5 is a schematic view of the preferred embodiment of the first support of FIG. 4;

FIG. 6 is a schematic view of the preferred embodiment of the second support of FIG. 4;

fig. 7 is a schematic view of a rear perspective structure of a first transmission mechanism and a first correction mechanism of a preferred embodiment of the automatic PCB board inspection machine of the present invention;

fig. 8 is a front perspective view of a second transmission mechanism of the automatic PCB board inspection machine according to the preferred embodiment of the present invention;

fig. 9 is a front view of a second transmission mechanism of the preferred embodiment of the automatic PCB inspection machine of the present invention;

fig. 10 is a rear perspective view of a second transmission mechanism of the preferred embodiment of the automatic PCB board inspection machine of the present invention;

FIG. 11 is a top view block diagram of a gear box of a second transport mechanism of a preferred embodiment of the PCB automated inspection machine of the present invention;

FIG. 12 is a cross-sectional view taken along line AA of FIG. 11;

FIG. 13 is a schematic view of a second correction mechanism of a preferred embodiment of the PCB automatic inspection machine of the present invention in a blocked state;

fig. 14 is a schematic view showing a structure of a second correction mechanism of a preferred embodiment of the automatic PCB board inspection machine of the present invention in an opened state;

FIG. 15 is a schematic view of a rear view of a second correction mechanism of a preferred embodiment of the PCB board automatic inspection machine of the present invention in a blocked state;

FIG. 16 is a schematic bottom perspective view of a second correction mechanism of a preferred embodiment of the PCB automatic inspection machine of the present invention in a blocked state;

fig. 17 is an enlarged view of a in fig. 16.

Detailed Description

Referring to the drawings, wherein like reference numbers refer to like elements throughout, the principles of the present invention are illustrated in an appropriate computing environment. The following description is based on illustrative embodiments of the invention and should not be taken as limiting other embodiments of the invention not described in detail herein.

Referring to fig. 1, fig. 1 is a schematic front view of a PCB board automatic inspection machine according to a preferred embodiment of the present invention. The preferred embodiment of the automatic PCB board inspection machine of the present invention comprises a transmission device having a feeding position 10a, a first correction position 10b, a second correction position 20c, a first inspection position 20d and a second inspection position 20e, a first correction mechanism 20, a second correction mechanism 40, an image acquisition device and a control system 70 electrically connected to the mechanisms and devices;

The conveying device comprises a first conveying mechanism 10 and a second conveying mechanism 30 connected with the first conveying mechanism 10, wherein a feeding position 10a is arranged at an upstream section of the first conveying mechanism 10, a first correcting position 10b is arranged at a downstream section of the first conveying mechanism 10, a second correcting position 20c is arranged at an upstream section of the second conveying mechanism 30, a first detecting position 20d is arranged at a middle section of the second conveying mechanism 30, and a second detecting position 20e is arranged at a downstream section of the second conveying mechanism 30; the image acquisition device comprises a first image acquisition mechanism 50 for acquiring a back image of the PCB to be tested and a second image acquisition mechanism 60 for acquiring a front image of the PCB to be tested;

the first correction mechanism 20 is disposed at the first correction bit 10b, the second correction mechanism 40 is disposed above the second correction bit 20c, the first image acquisition mechanism 50 is disposed below the first detection bit 20d, the second image acquisition mechanism 60 is disposed above the second detection bit 20e, and the control system 70 is disposed below the first correction mechanism 20.

The transmission device comprises a feeding position 10a for being transmitted into the PCB to be tested, a first correction position 10b for primarily correcting the PCB to be tested and a detection position for acquiring an image of the PCB to be tested, and is used for sequentially transmitting the PCB to be tested from the feeding position 10a to the first correction position 10b and the detection position;

The first correction mechanism 20 is used for correcting the PCB located at the first correction position 10 b;

the image acquisition device is used for acquiring the image of the PCB positioned at the detection position.

In the present embodiment, the transfer device includes a first transfer mechanism 10 provided with a feeding bit 10a and a first correction bit 10b, and a second transfer mechanism 30 provided with a detection bit, which is engaged with the first transfer mechanism 10.

Referring to fig. 2 to 4, the first transmission mechanism 10 includes a plurality of rollers 11 arranged in parallel, a first driving assembly for driving the rollers 11 to rotate, and a supporting member for supporting the PCB to be tested, the supporting member and the rollers 11 are alternately arranged, and a conveying plane 14 for conveying the PCB to be tested is formed by the rotation sides of the plurality of rollers 11;

the supporting piece comprises a supporting part for supporting the PCB to be tested, and the contact area of the supporting part and the PCB to be tested is overlapped with the conveying plane 14;

in this embodiment, the first transmission mechanism 10 corrects the left and right sides of the PCB to be tested, so as to avoid the deviation of the PCB to be tested from the testing position; the first transmission mechanism 10 adopts roller type transmission, so that the cost is reduced; the first supporting piece is used for supporting the PCB to be tested, so that the PCB to be tested is more stable in the transmission process; secondly, play the effect of reducing the transmission speed of PCB board that awaits measuring.

Referring to fig. 5 and 6, in the present embodiment, the supporting members are divided into a first supporting member 12 having a first supporting portion 121 and a second supporting member 13 having a second supporting portion 131, the conveying plane 14 includes an upstream section provided with a feeding position 10a and a downstream section provided with a first correcting position 10b, the first supporting member 12 is located at the upstream section, the second supporting member 13 is located at the downstream section, an end surface of the first supporting portion 121 facing the PCB to be tested is a convex arc surface, a contact area of the first supporting portion 121 and the PCB to be tested is a linear area, an end surface of the second supporting portion 131 facing the PCB to be tested is a plane or a hetero-shaped surface, and a contact area of the second supporting portion 131 and the PCB to be tested is a surface area.

The first supporting piece 12 of the line contact area is arranged at the upstream section of the first transmission mechanism 10, so that the PCB to be tested can be quickly transmitted to the first correction position 10b in order to have a quick transmission speed at the upstream section (the feeding position 10a section) of the first transmission mechanism 10 on the premise of stably supporting the PCB to be tested, and the transmission efficiency is improved; the second supporting portion 13 of the surface contact area is disposed at the downstream section, so as to enable the transmission speed of the PCB to be tested to be relatively reduced, so that the PCB to be tested can be stably transmitted to the second transmission mechanism 30 after being corrected at the first correction position 10b, and excessive deflection of the PCB to be tested after the first correction is avoided.

The driving force of the roller 11 to the PCB to be tested can cause fine deviation of the PCB to be tested in the process of transmission due to fine deviation of the rotational wheelbase between the rollers 11 and fine difference of friction coefficient of the contact areas of the two, and the contact area of the second supporting member 13 increases the contact area of the PCB to be tested and the second supporting member 13. Therefore, the stability of the transmission of the PCB to be tested is improved.

Referring to fig. 6, in the present embodiment, preferably, an end surface of the second supporting portion 131 facing the PCB to be tested is a special-shaped surface, and the special-shaped surface includes a supporting plane 1311 contacting the PCB to be tested and inclined planes 1312 connected to one side or both sides of the supporting plane 1311. Preferably, the inclined surfaces 1312 are disposed on both sides of the support plane 1311.

In the setting of the abnormal surface, the supporting plane 1312 plays a role in supporting the PCB to be tested, and the inclined plane 1312 inclines downwards and is close to the roller 11, so as to prevent substances from falling into the accommodating space of the first correction mechanism 20 and affecting the stability of the first correction mechanism 20; in addition, the inclined plane 1312 is obliquely arranged below to improve the operation stability of the first transmission mechanism 10, if the components on the PCB to be tested, such as the bonding pads, are loosened and drop during the transmission process, the components on the PCB to be tested will fall into the space defined by the roller 11 and the inclined plane 1312 after dropping because of the relatively lower volume of the components on the PCB to be tested, so that the transmission of the PCB to be tested is not affected; if the components on the PCB to be tested, such as the trace, are partially off-line, the portion of the trace off-line will be in sliding contact with the second support 13 during transmission, and the inclined arrangement of the trace down will avoid the off-line or the clip or hook between the second support 13 and the roller 11, thereby avoiding the further damage of the PCB to be tested.

Likewise, the first supporting portion 121 of the first supporting member 12 faces the end face of the PCB to be tested and is a convex arc surface, so that the material is prevented from falling into the accommodating space of the first correcting mechanism 20, the stability of transportation of the PCB to be tested is improved, and the further damage of the PCB to be tested is avoided. Preferably, the convex cambered surface is an arc surface.

Referring to fig. 2 and 3, in the present embodiment, the first conveying mechanism 10 further includes fixing plates 15 fixedly disposed at two ends of the roller 11, and the supporting member further includes a fixing portion fixedly connected to the supporting portion, wherein the fixing portion is fixedly connected to the fixing plates 15.

Specifically, the first supporting element 12 further includes a first fixing portion 122 fixedly connected to the first supporting portion 121, the second supporting element 13 further includes a second fixing portion 132 fixedly connected to the second supporting portion 13, and both ends of the first fixing portion 122 and both ends of the second fixing portion 132 are fixedly connected to the fixing plate 15.

The first driving assembly includes a first conical gear 161 and a second conical gear 162 arranged in engagement with each other by 90 ° and a first motor 163 driving the first conical gear 161 to rotate, the first conical gear 161 is connected to the first motor 163 through a rotation shaft 164, and the second conical gear 162 is fixedly connected to one end of the drum 11 through a connection shaft.

The first conveying mechanism 10 further comprises a bottom plate 17, and the fixing plate 15 is fixedly connected to the bottom plate 17.

In this embodiment, the stability of the transmission is improved by the arrangement of the first transmission mechanism 10, so that the transmission of the PCB board to be tested is more stable.

Referring to fig. 2 and 3, in the present embodiment, a first calibration mechanism 20 is disposed at a first calibration position 10b, and includes a first baffle 21, a calibration plate 22, a trigger sensor 23, a deceleration sensor combination, and a reset sensor 27:

the first baffle 21 is fixedly disposed at one side of the conveying plane 14; the correction plate 22 is arranged on the other side of the conveying plane 14 and is used for pushing the PCB to be tested, and the sliding direction of the correction plate 22 is perpendicular to the conveying direction of the conveying plane 14; a trigger sensor 23 is provided at the conveyance end of the conveyance plane 14 for triggering the movement operation of the correction plate 22 and the first conveyance mechanism 10 to enter a state of delayed conveyance; the speed reduction sensor is arranged between the correction plate 22 and the first baffle 21 in a combined way and is used for reducing and controlling the moving speed of the correction plate 22 in multiple layers; a reset sensor 27 is provided between the correction plate 22 and the first shutter 21, fixedly provided on the first shutter 21, for stopping the movement of the correction plate 22 and triggering a reset operation of the correction plate 22;

The speed reduction sensor combination and the reset sensor 27 are both positioned in the sliding direction of the correction plate 22, and the reset sensor 27 is closer to the first shutter 21 than the speed reduction sensor combination;

the speed reduction sensor assembly includes a first speed reduction sensor unit fixedly disposed on the correction plate 22 for reducing the moving speed of the correction plate for the first time, and a second speed reduction sensor unit fixedly disposed on the first shutter 21 for reducing the moving speed of the correction plate 22 for the second time;

it should be understood that the trigger sensor 23 triggers the movement operation of the correction plate 22 and the first transmission mechanism 10 enters a delayed transmission state, that is, the PCB to be tested is transmitted to the sensing direction of the trigger sensor 12 by the first transmission mechanism 10, the trigger sensor 12 senses the PCB, and the correction plate 22 starts to move toward the first baffle 21 with the aim of pushing the PCB to be tested; meanwhile, the first transmission mechanism 10 enters a delay state, that is, the first transmission mechanism 10 pauses the transmission of the PCB board, and after the correction board 22 corrects the PCB board, the first transmission mechanism 10 continues to operate to transmit the corrected PCB board, wherein the delay state is a time from the triggering of the moving operation of the correction board 22 to the triggering of the resetting operation of the correction board 22, and the delay time is customizable.

The speed reduction sensor combination is used for controlling the moving speed of the correction plate 22, and the first speed reduction sensing unit on the correction plate 22 moves to the lower part of the PCB to be detected, so that when the sensing surface of the first speed reduction sensing unit faces the PCB, the first speed reduction sensing unit senses the PCB, and the correction plate 22 is triggered to reduce speed; then, when the decelerated correction plate 22 pushes the PCB to move to the induction direction of the second deceleration induction unit, the second deceleration induction unit induces the PCB, so that the correction plate 22 is triggered to decelerate further; and finally, finishing the correction process of the PCB to be tested.

The reset sensor 27 is used for stopping the movement of the correction plate 22 and triggering the reset operation of the correction plate 22, wherein a transitional delay state is also provided in the process from the stop movement state of the correction plate 22 to the reset state of the correction plate 22, that is, when the correction plate 22 after the secondary deceleration pushes the PCB to move to the sensing direction of the reset sensor 27, the reset sensor 27 senses the PCB, the correction plate 22 stops pushing the PCB and is in the delay state, and after the delay state is terminated, the correction plate 22 triggers the reset operation, and the correction plate 22 returns to the original position.

The delay time of the delay state of the reset sensor 27 is to judge whether the PCB corrected by the correction board 22 is qualified or not, (the PCB can be subjected to image acquisition by the CCD camera and compared by the control system 70 to judge whether the correction is qualified or not, the image acquisition by the CCD camera can be triggered by the reset sensor 27), if the delay time is qualified, the correction board 22 is reset after the delay time is terminated; if it is not acceptable, a flashing light or audible alarm prompts the person to check, at which point the correction plate 22 stops and the delay state of the first transport mechanism 10 is discontinued.

The first deceleration sensing unit is used for avoiding the collision of the PCB to be tested when the PCB to be tested is pushed due to the overlarge moving speed of the correction plate 22 when the correction plate 22 contacts the PCB to be tested in the moving process; the second deceleration sensing unit is used for avoiding the excessive speed of the correction plate 22 pushing the PCB to the first baffle 21 when the correction plate 22 pushes the PCB to move towards the first baffle 21, so that the PCB is damaged due to collision with the first baffle 21.

The first deceleration sensing unit and the second deceleration sensing unit are used for performing level decreasing on the moving speed of the correction plate 22, so that the PCB to be tested is protected; on the other hand, on the premise of protecting the PCB to be tested, the correction efficiency is improved; and avoid correcting drive assembly overstrain, improved and correct drive assembly's life.

Further, the first deceleration sensing unit includes a first deceleration sensor 24 and a second deceleration sensor 25 fixedly provided on the correction plate 22; the second reduction sensor unit includes a third reduction sensor 26 fixedly provided on the first shutter 21, and the first reduction sensor 24 is closer to the correction plate 22 than the second reduction sensor 25.

The first deceleration sensor 24 senses the PCB, the correction plate 22 is close to the PCB, the purpose of transitional deceleration is achieved, the drive assembly is prevented from being damaged due to too fast deceleration of the correction plate 22, and the correction plate 22 is prevented from damaging the PCB to be tested; then the second deceleration sensor 25 senses the PCB, the correction plate 22 contacts the PCB, the correction plate 22 is further decelerated, and the PCB to be tested is further protected; then the third speed reduction inductor 26 senses the PCB board, and the PB board that correction board 22 promoted is close to first baffle 21, and then further to the speed reduction of correction board 22, avoided the damage of first baffle 21 to the PCB board that awaits measuring, play the effect of protection PCB board that awaits measuring.

In addition, when the correction plate 22 is in the original state, the distance from the first deceleration sensor 24 to the second deceleration sensor 25 is smaller than the distance from the second deceleration sensor 25 to the third deceleration sensor 26, and the distance from the second deceleration sensor 25 to the third deceleration sensor 26 is larger than the distance from the third deceleration sensor 26 to the reset sensor 27, so that the deceleration amplitude of the first deceleration sensor 24 triggering the correction plate 22 is smaller than the deceleration amplitude of the second deceleration sensor 25, and the deceleration amplitude of the second deceleration sensor 25 triggering the correction plate 22 is larger than the deceleration amplitude of the third deceleration sensor 26. Since the second deceleration sensor 25 has a long distance from the third deceleration sensor 26, the inertial movement of the PCB board can be buffered, thereby ensuring the degree of deceleration of the correction plate 22.

The trigger sensor 23 has two.

In the embodiment, the support at the first calibration position 10b has a notch extending along the axis of the drum 11, and the trigger sensor 23, the speed reduction sensor assembly and the reset sensor 27 are disposed directly below the notch and have sensing directions of the conveying plane 14.

Referring to fig. 4, specifically, the second supporting member 13 is located at the first calibration position 10b, the second supporting member 13 has a notch extending along the axial direction of the roller 11, and the trigger sensor 23, the first deceleration sensor 24, the second deceleration sensor 25, the third deceleration sensor 26 and the reset sensor 27 are disposed directly below the notch and have sensing directions of the conveying plane 14. The notch is strip-shaped, so that the sliding seat can conveniently extend into the notch and move in the direction of extending the notch.

Referring to fig. 7, in the present embodiment, the first calibration mechanism 20 further includes a bottom case 28 fixedly connected to two sides of the conveying plane 14 and located right below the conveying plane 14, an accommodating space defined by the bottom case 28 and the conveying plane 14, and a calibration driving assembly disposed in the accommodating space for driving the calibration plate 22 to slide;

the correction driving assembly comprises a slide seat fixedly connected to the correction plate 22, a guide rail fixedly arranged on the shell 28 and slidably connected with the slide seat, a belt 291 for driving the slide seat to slide on the guide rail, a driving wheel and a driven gear arranged at two ends of the belt 291, and a correction motor 292 for driving the driving wheel to rotate, wherein the belt 291 is fixedly connected with the slide seat through a belt fixing box.

In the embodiment, the arrangement of the first correction mechanism 20 corrects the transmission paths of the PCB board to be tested to the first detection position 20d and the second detection position 20e, and improves the accuracy of the transmission.

Referring to fig. 8 to 10, in the present embodiment, the second transmission mechanism 30 includes at least two upstream conveyors 311 arranged side by side, at least two downstream conveyors 321 connected to the upstream conveyors 311, an upstream driving shaft and an upstream synchronizing shaft 312 respectively arranged at two ends of the upstream conveyors 311, a downstream driving shaft and a downstream synchronizing shaft 322 respectively arranged at two ends of the downstream conveyors 321, and a second driving assembly for driving the upstream driving shaft and the downstream driving shaft to rotate; a gap 33 for the image acquisition device to acquire an image is provided between the upstream belt 311 and the downstream belt 321; specifically, the gap 33 is used for the first image acquisition mechanism to acquire the image of the PCB board to be tested;

The upstream conveyor belts 311 and the downstream conveyor belts 321 are correspondingly connected one by one, and the upstream conveyor belts 311 and the downstream conveyor belts 321 are arranged at intervals.

It should be noted that the second conveying mechanism 30 includes an upstream section connected to the first conveying mechanism 10 and a downstream section connected to the upstream section, where the upstream conveyor 311 is an upstream section of the second conveying mechanism 30, and the downstream conveyor 321 is a downstream section of the second conveying mechanism 30.

Compared with the prior art, the PCB board to be tested is conveyed by adopting the single conveying belt, because the single conveying belt is large in amplitude, when the driving shaft drives the PCB board to rotate, the single conveying belt is easy to slip to influence the conveying stability, so that at least two conveying belts with small amplitudes are adopted to replace the single conveying belt, the technical problem is solved, and the conveying stability is improved.

In this embodiment, since the second conveying mechanism 30 has an upstream section and a downstream section, at least two upstream conveying belts 311 are used for conveying the upstream section, and at least two downstream conveying belts 321 are used for conveying the downstream section, so that slipping of the upstream driving shaft and the downstream driving shaft is avoided, and stability of conveying the PCB board to be tested is improved. The upstream conveyor 311 and the downstream conveyor 321 are disposed at intervals to avoid the unstable conveyance caused by the mutual interference between the conveyors.

Since the upstream sections are conveyed in the form of at least two upstream conveyor belts 311, the width of each upstream conveyor belt 311 is set to be substantially uniform in order to make the conveyance of each conveyor section more stable. By the arrangement, the rolling friction force of the upstream conveyor belt 311 to the upstream driving shaft tends to be consistent, obvious difference of the rolling friction force is avoided, and the conveying stability of the upstream conveyor belt 311 can be improved under the condition that the rolling force output by the upstream driving shaft is constant. The downstream segments are also conveyed in the form of at least two downstream conveyors 321, each downstream conveyor 321 having a substantially uniform width.

On the other hand, the downstream conveyor belt 321 needs to be engaged with the upstream conveyor belt 311, and thus the upstream conveyor belt 311 and the downstream conveyor belt 321 are in one-to-one correspondence, and the widths of the corresponding upstream conveyor belt 311 and downstream conveyor belt 321 are substantially uniform.

In the embodiment, since the second conveying mechanism 30 is used to convey the PCB board to be tested, and the weight of the PCB board is light, it is sufficient that the number of the upstream conveyer 311 and the downstream conveyer 321 are two each.

In the present invention, the width of each upstream belt 311 and the width of each downstream belt 321 may be different; the number of upstream conveyors 311 and the number of downstream conveyors 321 may be greater than two.

In the present embodiment, an upstream driving shaft is provided at the end of the upstream conveyor 311, and a downstream driving shaft is provided at the head end of the downstream conveyor 321; the second driving assembly comprises a gear box 34 for driving the upstream driving shaft and the downstream driving shaft to rotate and a second motor 35 for driving the gear box 34 to rotate, the rotating shaft of the second motor 35 is rotationally connected with the gear box 34, and the gear box 34 is rotationally connected with the upstream driving shaft and the downstream driving shaft.

Referring to fig. 11 and 12, the gear box 34 includes a housing 341, a driving gear 342 disposed in the middle of the housing 341, a first driven gear 343 engaged on one side of the driving gear 342, a second driven gear 344 engaged on the other side of the driving gear 342, a main connecting shaft 345 fixedly connected to the driving gear 342, a first auxiliary connecting shaft 346 fixedly connected to the first driven gear 343, and a second auxiliary connecting shaft 347 fixedly connected to the second driven gear 344;

the main connecting shaft 342 is fixedly connected with the rotating shaft of the second motor 35 through a coupling, the first auxiliary connecting shaft 346 is fixedly connected with the upstream driving shaft through a coupling, and the second auxiliary connecting shaft 347 is fixedly connected with the downstream driving shaft through a coupling; the first driven gear 343 and the second driven gear 344 are identical in shape and size.

The upstream driving shaft and the downstream driving shaft are adjacently arranged, so that cost is saved, the driving is realized by using a gear box 34, and respective driving mechanisms are not needed; secondly, space is saved for the gearbox 34 so that the gearbox 34 can be miniaturized.

The gear box 34 is arranged, so that the driving of the upstream driving shaft and the downstream driving shaft is more stable and the control degree is more accurate; first, the driving gear 342 is adopted to simultaneously drive the first driven gear 343 and the second driven gear 344, so that the rotation synchronism of the upstream driving shaft and the downstream driving shaft is improved, and the conveying stability is improved; secondly, the cooperation of the second motor 35 and the gear box 35 is adopted, and gears in the gear box 35 are meshed to convert the high-speed rotation speed of the second motor 35, so that the rotation speeds of an upstream driving shaft and a downstream driving shaft are reduced, and the controllability is improved; and the accuracy of the gear transmission is higher than that of the belt transmission or the sliding transmission, so that the control accuracy of the embodiment is further improved.

Further, the driving gear 342, the first driven gear 343 and the second driven gear 344 are arranged in an isosceles triangle form. By the arrangement, the stability of transmission of the three components is improved, the arrangement stability of the three components is also improved, the arrangement space is saved, and the miniaturization characteristic of the gear box 34 is improved.

Referring to fig. 8, in the present embodiment, the second conveying mechanism 30 further includes side plates 36 disposed on both sides of the upstream conveyor 311 and the downstream conveyor 321, and an upstream support plate and a downstream support plate fixedly disposed between the side plates 36;

the upstream driving shaft, the upstream synchronizing shaft 312, the downstream driving shaft and the downstream synchronizing shaft 322 are all rotatably fixed on the side plate 36, the upstream supporting plate is positioned between the upstream driving shaft and the upstream synchronizing shaft 312, and the downstream supporting plate is positioned between the downstream driving shaft and the downstream synchronizing shaft 322;

the upstream support plate and the downstream support plate may be approximately equal in width and may be equal in length or unequal in length.

The upstream supporting plate is used for supporting the upstream conveying belt 311, and the downstream supporting plate is used for supporting the downstream conveying belt 321, so that the PCB to be tested can be conveyed more stably in the conveying process. The length between the two is required to be determined according to the actual situation.

The second transmission mechanism 30 further comprises rolling shafts 37 arranged at two ends of the gap 33 and used for propping against the PCB to be tested, and the rolling shafts 37 are rotationally connected with the top of the side plate 36 through fixed blocks; the outer peripheral surface of the rolling shaft 37 is coated with a flexible layer, and the distance from the flexible layer to the upstream conveyor belt 311 and the distance from the flexible layer to the downstream conveyor belt 321 are slightly smaller than the thickness of the PCB to be tested.

In addition, the rolling shaft 37 provided above the upstream driving shaft is offset to the upstream direction of the upstream conveyor 311 and is offset to the upstream driving shaft, and the rolling shaft 37 provided above the downstream driving shaft is offset to the downstream direction of the downstream conveyor 321 and is offset to the downstream driving shaft.

The arrangement of the rolling shaft 37: firstly, the effect of flattening the PCB to be tested is achieved, and the influence of the uneven flatness of the PCB to be tested on the quality of the acquired image of the subsequent second image acquisition mechanism 60 is avoided; secondly, the function of stabilizing the PCB to be tested is achieved, so that the PCB to be tested is more stable when passing through the gap 33, and the image acquisition quality of the first image acquisition mechanism 50 on the PCB to be tested is improved; thirdly, the flexible layer is arranged, so that the damage to the PCB to be tested caused by the rolling shaft 37 is avoided, and the effect of protecting the PCB to be tested is achieved. Preferably, the flexible layer is rubber or foam; fourth, the staggered arrangement of the rolling shaft 37 and the upstream driving shaft, and the rolling shaft 37 and the downstream driving shaft avoids the interference of the upstream driving shaft and the downstream driving shaft to the PCB to be tested by the rolling shaft 37, and improves the stability of the rolling shaft 37 to the PCB to be tested.

Based on the above structure, referring to fig. 10, the second transmission mechanism 30 further includes a bottom plate 38 having an opening 381, two ends of the side plate 36 are fixedly connected to the bottom plate 38 through the supporting blocks 361, the second driving assembly is fixedly connected to the bottom plate 38 through a fixing base 39, the opening 381 is disposed directly under the gap 33, and a cross-sectional area of the opening 381 is larger than a cross-sectional area of the gap 33.

Setting the cross-sectional area of the opening 381 to be larger than the cross-sectional area of the void 33 facilitates adjustment of the location of the void 33 and mounting of the first image capturing mechanism 50 in place, avoids the influence of the bottom plate 38 on the image capturing angle thereof, and facilitates mounting of the first image capturing mechanism 50.

In addition, in the present embodiment, referring to fig. 3 and 9, the feeding position 10a is located at an upstream section of the first conveying mechanism 10; the first correction bit 10b is located in the downstream section of the first transfer mechanism 10; the detection positions are divided into a first detection position 20d for acquiring a back image of the PCB to be detected and a second detection position 20e for acquiring a front image of the PCB to be detected, wherein the first detection position 20d is positioned at the gap 33, and the second correction position 20c is positioned in the upstream direction of the first detection position 20d, namely on the upstream conveyor belt 311 and is connected with the first correction position 10b; the second detection bit 20e is located in the downstream direction of the first detection bit 20d, i.e., on the downstream conveyor 321.

In this embodiment, the second transmission mechanism 30 improves the stability of transmission, and avoids the offset of the PCB board to be tested.

In this embodiment, referring to fig. 13, 14 and 16, the automatic PCB board inspection machine includes a second correction mechanism 40 for secondarily correcting the PCB board to be inspected, where the second correction mechanism 40 is disposed above the second correction position 20 c;

The second correcting mechanism 40 comprises a fixing plate 41 transversely arranged, an inductor 42 clamped on the fixing plate 41 and used for inducing a PCB to be detected, a rotating shaft 43 fixedly arranged on the fixing plate 41, a correcting component rotationally connected with the rotating shaft 43 and a driving component 45 for driving the correcting component to rotationally lift and rotationally descend, the inductor 42 is arranged in front of the correcting component, the rotating shaft 43 is fixedly connected with the fixing plate 41 through a supporting seat 431, the correcting component extends out of the fixing plate 41 and extends towards the direction of the second correcting position 20c, and the driving component 45 is fixedly connected with the fixing plate 41 through a fixing component 451;

the calibration assembly includes a connecting member 441 rotatably connected to the rotating shaft 43, an extension plate 442 fixedly connected to the connecting member 441 and extending toward the second calibration position 20c, and a second baffle 443 adjustably disposed on the extension plate 442, wherein the second baffle 443 is used for blocking the PCB to be tested transferred to the second calibration position 20c, so as to correct the deviation of the PCB to be tested.

Referring to fig. 13, when the second correction mechanism 40 is in the blocking state, the driving member 45 is in the stationary state, the extension plate 442 is close to the fixed plate 41, and the second barrier 443 is close to the plane in which the second correction position 20c is located; referring to fig. 14, when the second correction mechanism 40 is in the open state, the driving member 45 pushes the connecting member 441 downward, the connecting member 441 rotates upward, the extension plate 442 rotates upward with the connecting member 441 and moves away from the fixed plate 41, and the second baffle 443 rotates upward and moves away from the plane of the second correction position 20 c.

In this embodiment, through setting up of correction component, adopt the second baffle 443 to block the PCB board that awaits measuring to make the whole neat of PCB board that awaits measuring, it is neat to align around, has avoided the PCB board skew that awaits measuring to go out the position of detecting, so that follow-up image acquisition device obtains high-quality image to the image acquisition of PCB board that awaits measuring.

In the present embodiment, when the second correction mechanism 40 is in the blocking state, the longitudinal extension directions of the extension plate 442 and the second barrier 443 are both substantially perpendicular to the plane in which the second correction position 20c lies.

By such an arrangement, the combined height of the extension plate 442 and the second barrier 443 from the plane in which the second correction position 20c is located is minimized, thereby minimizing the rotation radius of both, reducing the rotation space of both, and saving the occupied space.

In addition, the height of the fixing plate 41 from the second correction position 20c is slightly larger than the thickness of the PCB board to be tested. The arrangement is such that the distance that the combination extends to the plane in which the second correction bit 20c lies is reduced, thereby reducing the radius of rotation of the combination and reducing the space in which it rotates; on the other hand, the installation height of the second correction mechanism 40 is reduced, saving installation space.

In addition, the driving member 15 is a cylinder, a connecting block 4411 is convexly provided on a surface of the connecting piece 441 facing the cylinder, and a push rod of the cylinder is connected with the connecting block 4411 through a latch 46.

Such a setting is convenient for the equipment connection of cylinder and connecting piece 441, simple structure, and saves installation space.

Referring to fig. 17, in the present embodiment, the extension plate 442 includes at least two height-adjusting through holes 4421 arranged in parallel, the second baffle 443 includes a threaded post 4431 fixedly disposed on the second baffle 443 and engaged with the height-adjusting through holes 4421, the threaded post 4431 passes through the height-adjusting through holes 4421, and the second baffle 443 is fixedly disposed on the extension plate 442 through the threaded connection of the threaded post 4431 and the nut 4432; the height of the height-adjusting through hole 4421 is larger than the outer diameter of the threaded post 4431. Alternatively, there are four elevation holes 4421.

By the arrangement, the second baffle 443 can be finely adjusted in height so as to adapt to the PCB to be tested with different thicknesses. Optionally, the cross-section of the height-adjusting through hole 4421 is track-shaped, and the threaded column 4431 is cylindrical, so that the shape is matched with the semi-circular shape at the upper end and the lower end of the track-shaped, and the height-adjusting through hole 4421 is prevented from being excessively opened.

Referring to fig. 16, in the present embodiment, the fixing plate 41 includes an opening 411 having an extending direction consistent with that of the fixing plate 41, and the opening 411 is disposed in front of the extending plate 442; the inductor 42 includes an inductor body 421 and a fixing portion 422 fixing the inductor body 421;

The sensor body 421 passes through the opening 411 and faces the second correction position 20c, the fixing portion 422 abuts against the outer side of the opening 411, and the width of the fixing portion 422 is greater than the width of the opening 411. Alternatively, the opening 411 has an elongated racetrack shape.

By the arrangement, the sensor 42 can conveniently adjust the position on the opening 411 so as to accurately position the sensing of the PCB to be tested.

In the embodiment, the rotation shafts 43 are disposed at both ends of the fixing plate 41, the extension plates 442 are fixedly coupled between the connection members 441, and the opening 411 is located between the connection members 441.

Referring to fig. 17, at least two side-by-side grooves 412 are disposed on a side of the fixing plate 41 facing the extending plate 442, the notches of the grooves 412 face the extending plate 442, the grooves 412 are fixedly disposed in the buffer blocks 413, and the buffer blocks 413 slightly protrude from the notches of the grooves 412. This arrangement prevents the extension plate 442 from touching the fixed plate 41 directly, thereby providing a buffer and preventing damage to the calibration assembly.

When the second correction mechanism 40 is in the blocking state, the driving part 45 is in a static state, the extension plate 442 abuts against the buffer block 413, and the second baffle 443 is close to and perpendicular to the plane in which the second correction position 20c is located;

When the second correction mechanism 40 is in the open state, the driving part 45 pushes the connecting member 441 downward, the connecting member 441 rotates upward, the extension plate 442 rotates upward with the connecting member 441 and away from the buffer block 413, and the second barrier 443 rotates upward and away from and is inclined to the plane in which the second correction position 20c is located.

In this embodiment, through the setting of the second correction mechanism 40, the offset of the front and rear positions of the PCB to be tested is corrected, so that the PCB to be tested can more accurately and completely enter the ranges of the first detection position 20d and the second detection position 20e, and the image acquisition device acquires a high-quality image.

In this embodiment, referring to fig. 1 and 9, the detection bits include a first detection bit 20d for detecting the back surface of the PCB to be detected and a second detection bit 20e for detecting the front surface of the PCB to be detected, the first detection bit 20d is disposed at the gap 33, and the second detection bit 20e is disposed downstream of the first detection bit 20 d; the image acquisition device comprises a first image acquisition mechanism 50 located below the first detection bit 20d and a second image acquisition mechanism 60 located above the second detection bit 20 e;

the first detection bit 20d and the second detection bit 20e are disposed in a staggered manner, and the first image acquisition mechanism 50 and the second image acquisition mechanism 60 are prevented from interfering with each other.

The first image acquisition mechanism 50 includes a first CCD assembly 51 for acquiring an image of the PCB to be measured and a first lamp box 52 for providing a light source to the first CCD assembly 51; the second image acquisition mechanism 60 includes a second CCD assembly 61 for acquiring an image of the PCB to be measured and a second lamp box 62 for providing a light source to the second CCD assembly 61.

In an embodiment, the second image capturing mechanism 60 further includes a thickness sensor 63 for sensing the thickness of the PCB board to be tested, and the thickness sensor 63 is located upstream of the first detecting position 20 d. The thickness sensor 63 is used for sensing the thickness of the PCB board to be tested and transmitting the thickness information to the control system 70, and the control system 70 outputs information for focusing the second image acquisition mechanism 60 according to the thickness information, so as to ensure the image acquisition quality of the second image acquisition mechanism 60.

The automatic PCB board detection machine further comprises a laser marking device arranged at the upstream of the first detection position 20d and a control system 70 electrically connected with the transmission device, the image acquisition device, the first correction mechanism 20 and the second correction mechanism 40, wherein the control system 70 is arranged under the first correction mechanism 20, and the laser marking device is used for carrying out laser marking on the PCB board to be detected. The laser marker and the thickness sensor 63 are arranged side by side.

In this embodiment, by arranging the first image acquisition mechanism 50 and the second image acquisition mechanism 60, the front and back image acquisition is completed in one transfer of the PCB board to be tested, so that one-time detection is realized, the time for detecting the PCB board to be tested is shortened, and the detection efficiency is improved.

The first CCD assembly 51 and the second CCD assembly 61 have the same structure, and the first light box 52 and the second light box 62 have the same structure, and only the first CCD assembly 51 and the first light box 52 will be described below.

The first CCD module 51 includes a first CCD camera, the first light box 52 includes a light box housing and a first light emitting means for improving bypass irradiation light provided in the light box housing, a second light emitting means for projecting irradiation light and a light diffusing plate combination for performing diffuse reflection operation on the bypass irradiation light and radiating the same to the first detection position 20d, and a half-reflecting half-transmitting glass for performing mirror reflection operation on the projected irradiation light and radiating the same to the first detection position 20d, wherein the light diffusing plate combination is opposite to the first detection position 20d and provided between the first detection position 20d and the half-reflecting half-transmitting glass, the first light emitting means is provided on a lower peripheral side of the light diffusing plate combination, and the second light emitting means is provided on one side of the half-reflecting half-transmitting glass, wherein a central area of the light diffusing plate combination is provided with an opening for directly irradiating the light reflected by the half-reflecting half-transmitting glass onto the first detection position 20 d.

The arrangement of the first lamp box 52 can carry out omnibearing irradiation on the PCB to be tested by providing light in different directions, so that the acquisition quality of the CCD camera on the image of the PCB is improved, and the resolution of the image is improved.

In the present embodiment, the feeding level 10a is provided at the upstream section of the first conveying mechanism 10, the first correction level 10b is provided at the downstream section of the first conveying mechanism 10, the second correction level 20c is provided at the upstream section of the second conveying mechanism 30 (the conveying area of the upstream conveying belt 311), the first detection level 20d is provided at the gap 33 of the second conveying mechanism 30, and the second detection level 20e is provided at the downstream section of the second conveying mechanism 30 (the conveying area of the downstream conveying belt 321); the first correction mechanism 20 is disposed at the first correction position 10b, the second correction mechanism 40 is disposed above the second correction position 20c, the first image acquisition mechanism 50 is disposed below the first detection position 20d, the second image acquisition mechanism 60 is disposed above the second detection position 20e, the control system 70 is disposed below the first correction mechanism 20, and the control system 70 controls the operation of the first transmission mechanism 10, the first correction mechanism 20, the second transmission mechanism 30, the second correction mechanism 40, the first image acquisition mechanism 50, and the second image acquisition mechanism 60.

The detection process of the PCB to be detected in the embodiment is as follows:

firstly, the control system 70 is started, the PCB to be tested enters the feeding position 10a of the first transmission mechanism 10, and the PCB to be tested stably moves to the first correction position 10b on the transmission plane 14 under the support of the supporting piece and the transmission of the roller 11;

when the PCB to be tested enters the first correction position 10b and the trigger sensor 23 of the first correction mechanism 20 senses the PCB to be tested, the first transmission mechanism 10 enters a delay state, the PCB to be tested stops being transmitted, and at the moment, the correction plate 22 is started and moves towards the direction of the first baffle 21; when the first deceleration sensor 24 senses the PCB to be tested, the correction plate 22 is close to the PCB to be tested, and the correction plate 22 is decelerated and moves continuously; when the second deceleration sensor 25 senses the PCB to be tested, the correction plate 22 is abutted against the PCB to be tested, and the correction plate 22 continues to decelerate and move; when the third deceleration sensor 26 senses the PCB to be tested pushed by the correction plate 22, the correction plate 22 further decelerates and continues to push the PCB to be tested; when the reset sensor 27 senses the PCB to be tested, the correction plate 22 pushes the PCB to be tested to be abutted against the first baffle 21, the correction of the left and right positions of the PCB to be tested is completed at the moment, the correction plate 22 is reset, the delay time of the first transmission mechanism 10 is over, the PCB to be tested after the first correction is continuously transmitted, and the PCB to be tested is transmitted to the second transmission mechanism 30;

Then, the PCB to be tested enters the second transmission mechanism 30, and the upstream conveying belt 311 conveys the PCB to be tested to the second correction position 20c under the transmission and driving of the second motor 35, the gear box 34 and the upstream driving shaft; at this time, the sensor 42 in the second correction mechanism 40 senses the PCB to be tested, the second correction mechanism 40 is in a blocking state, and the second baffle 443 blocks the PCB to be tested;

meanwhile, the laser marking device performs marking treatment on the blocked PCB to be measured, the thickness sensor senses the thickness of the PCB to be measured and transmits thickness information to the control system 70, and the control system 70 controls the second image acquisition mechanism 60 to perform focusing treatment; after the front-rear alignment of the PCB to be tested is completed, the second alignment mechanism 40 is put into an open state, the cylinder pushes the push rod downward, the push rod pushes the connector 441 of the alignment assembly to rotate upward around the rotation shaft 43, and at the same time, the extension plate 442 fixedly connecting the connector 441 and the second barrier 443 disposed on the extension plate 442 also rotate upward, and the second barrier 443 is far from the plane where the second alignment position 20c is located; meanwhile, the PCB to be tested continues to be conveyed forwards due to no blocking of the second baffle 443;

Then, the PCB to be tested after the secondary correction enters the first test position 20d under the transmission of the upstream transmission belt 311, and at the same time, the first light box 52 in the first image acquisition mechanism 50 irradiates the back surface of the PCB to be tested on the first test position 20d, and the first CCD assembly 51 performs scanning image acquisition on the back surface of the PCB to be tested passing through the first test position 20 d;

finally, the PCB board after the back surface inspection enters the second inspection position 20e under the transmission of the downstream transmission belt 321 of the second transmission mechanism 30, and at the same time, the second light box 62 in the second image acquisition mechanism 60 irradiates the front surface of the PCB board to be inspected on the second inspection position 20e, and the second CCD assembly 61 performs scanning image acquisition on the front surface of the PCB board to be inspected passing through the second inspection position 20 e.

Thus, the detection process of the PCB to be detected in the embodiment is completed.

Compared with the prior art, the PCB automatic detector has the beneficial effects that: in the automatic PCB detection machine, the roller conveying mode of the first conveying mechanism 10 reduces the cost; the convex arc of the first supporting piece 12 faces to the support of the PCB to be tested, and the stability of the conveying of the PCB to be tested is improved on the premise of ensuring the conveying efficiency of the first conveying mechanism 10; the arrangement of the abnormal surface of the second supporting piece 13 further improves the stability of the PCB to be tested and greatly reduces the possibility of larger deflection of the PCB to be tested after one-time correction, and the first supporting piece 12 and the second supporting piece 13 are arranged to avoid the situation that foreign objects fall into the accommodating space of the first correction mechanism 20 to cause unstable operation of the first correction mechanism 20;

While the present disclosure has been shown and described with respect to one or more implementations, equivalent alterations and modifications will occur to others skilled in the art based upon a reading and understanding of this specification and the annexed drawings. The present disclosure includes all such modifications and alterations and is limited only by the scope of the following claims. Furthermore, while a particular feature of the disclosure may have been disclosed with respect to only one of several implementations, such feature may be combined with one or more other features of the other implementations as may be desired and advantageous for a given or particular application. Moreover, to the extent that the terms "includes," has, "" contains, "or variants thereof are used in either the detailed description or the claims, such terms are intended to be inclusive in a manner similar to the term" comprising.

In summary, although the embodiments of the present invention have been described above, the numbers before the embodiments, such as "first" and "second", are used for convenience of description, and the order of the embodiments of the present invention is not limited. Moreover, the above-mentioned embodiments are not intended to limit the present invention, and those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, so the scope of the present invention is defined by the claims.

Claims

1. The second transmission mechanism is characterized by comprising an image acquisition device, at least two upstream conveyor belts arranged side by side, at least two downstream conveyor belts connected with the upstream conveyor belts, an upstream driving shaft and an upstream synchronizing shaft which are respectively arranged at two ends of the upstream conveyor belts, a downstream driving shaft and a downstream synchronizing shaft which are respectively arranged at two ends of the downstream conveyor belts, and a second driving assembly for driving the upstream driving shaft and the downstream driving shaft to rotate; a gap for the image acquisition device to acquire images is arranged between the upstream conveyor belt and the downstream conveyor belt;

the second transmission mechanism further comprises a detection position, the image acquisition device is positioned below the detection position, the image acquisition device is used for acquiring an image of the PCB positioned at the detection position, the detection position comprises a first detection position used for detecting the back surface of the PCB to be detected and a second detection position used for detecting the front surface of the PCB to be detected, the first detection position and the second detection position are arranged in a staggered mode, the image acquisition device comprises a first image acquisition mechanism positioned below the first detection position and a second image acquisition mechanism positioned above the second detection position, and the first image acquisition mechanism comprises a first CCD (charge coupled device) component used for acquiring the PCB image to be detected and a first lamp box used for providing a light source for the first CCD component; the second image acquisition mechanism comprises a second CCD assembly for acquiring the PCB image to be detected and a second lamp box for providing a light source for the second CCD assembly;

The upstream driving shaft is arranged at the tail end of the upstream conveying belt, and the downstream driving shaft is arranged at the head end of the downstream conveying belt;

the second driving assembly comprises a gear box for driving the upstream driving shaft and the downstream driving shaft to rotate and a second motor for driving the gear box to rotate, a rotating shaft of the second motor is rotationally connected with the gear box, and the gear box is rotationally connected with the upstream driving shaft and the downstream driving shaft;

the gear box comprises a shell, a driving gear arranged in the middle of the shell, a first driven gear meshed with one side of the driving gear, a second driven gear meshed with the other side of the driving gear, a main connecting shaft fixedly connected with the driving gear, a first auxiliary connecting shaft fixedly connected with the first driven gear and a second auxiliary connecting shaft fixedly connected with the second driven gear;

the main connecting shaft is fixedly connected with the rotating shaft of the second motor through a coupler, the first auxiliary connecting shaft is fixedly connected with the upstream driving shaft through a coupler, the second auxiliary connecting shaft is fixedly connected with the downstream driving shaft through a coupler, and the shape and the size of the first driven gear are consistent with those of the second driven gear.

2. The second transmission mechanism of claim 1, wherein the driving gear, the first driven gear, and the second driven gear are arranged in an isosceles triangle.

3. The second transfer mechanism of claim 1, further comprising side plates disposed on both sides of the upstream and downstream conveyors, an upstream support plate and a downstream support plate fixedly disposed between the side plates;

the upstream driving shaft, the upstream synchronizing shaft, the downstream driving shaft and the downstream synchronizing shaft are all rotatably fixed on the side plates, the upstream supporting plate is positioned between the upstream driving shaft and the upstream synchronizing shaft, and the downstream supporting plate is positioned between the downstream driving shaft and the downstream synchronizing shaft.

4. The second transmission mechanism according to claim 3, further comprising rolling shafts arranged at two ends of the gap for pressing against the PCB to be tested, wherein the rolling shafts are rotatably connected with the top of the side plate through a fixing block; the outer peripheral surface of the rolling shaft is coated with a flexible layer, and the distance from the flexible layer to the upstream conveyor belt and the distance from the flexible layer to the downstream conveyor belt are slightly smaller than the thickness of the PCB to be tested.

5. The second conveyor mechanism of claim 4, wherein said rolling shafts disposed above said upstream drive shaft are offset to the upstream direction of said upstream conveyor and said upstream drive shaft are offset to each other, and said rolling shafts disposed above said downstream drive shaft are offset to the downstream direction of said downstream conveyor and said downstream drive shaft are offset to each other.

6. A second transfer mechanism according to claim 3, further comprising a bottom plate having an opening, wherein the two ends of the side plate are fixedly connected to the bottom plate via support blocks, wherein the second driving assembly is fixedly connected to the bottom plate via a fixing base, wherein the opening is disposed directly under the gap, and wherein the cross-sectional area of the opening is larger than the cross-sectional area of the gap.

7. An automatic PCB board detection machine, characterized in that the automatic PCB board detection machine further comprises a first transmission mechanism, a first correction mechanism, a second correction mechanism and an image acquisition device by using the second transmission mechanism of any one of claims 1-6;

the first transmission mechanism is provided with a feeding position and a first correction position, the first correction mechanism is arranged at the first correction position, the first correction mechanism is used for correcting a PCB (printed Circuit Board) positioned at the first correction position, the second transmission mechanism is connected to one end of the first transmission mechanism, the second transmission mechanism further comprises a second correction position which is used for secondarily correcting the PCB to be detected and is positioned between the first correction position and the detection position, and the second correction mechanism is arranged above the second correction position and is used for secondarily correcting the PCB to be detected;

The first CCD assembly comprises a first CCD camera, the first lamp box comprises a lamp box shell, a first light emitting component, a second light emitting component and a light scattering plate combination, the first light emitting component is arranged in the lamp box shell and used for improving bypass irradiation light, the second light emitting component is used for projecting irradiation light, the light scattering plate combination is used for performing diffuse reflection operation on the bypass irradiation light and radiating the bypass irradiation light to the first detection position, the light scattering plate combination is opposite to the first detection position and is arranged between the first detection position and the semi-reflective semi-transmissive glass, the first light emitting component is arranged on the lower periphery side of the light scattering plate combination, the second light emitting component is arranged on one side of the semi-reflective semi-transmissive glass, and an opening is arranged in the central area of the light scattering plate combination and is used for directly radiating light reflected by the semi-reflective semi-transmissive glass on the first detection position;

the second CCD component has the same structure as the first CCD component.

8. The automatic PCB board inspection machine according to claim 7, wherein the first transmission mechanism comprises a plurality of rollers arranged in parallel, a first driving assembly for driving the rollers to rotate, and a supporting member for supporting the PCB board to be inspected, the supporting member and the rollers are alternately arranged, and the rotating sides of the rollers form a transmission plane for transmitting the PCB board to be inspected;

the support members are divided into a first support member with a first support portion and a second support member with a second support portion, the conveying plane comprises an upstream section provided with the feeding level and a downstream section provided with the first correction level, the first support member is positioned at the upstream section, and the second support member is positioned at the downstream section;