CN114509449A

CN114509449A - Double-side inspection equipment

Info

Publication number: CN114509449A
Application number: CN202210158840.5A
Authority: CN
Inventors: 杨云仙; 曹葵康; 温延培; 其他发明人请求不公开姓名
Original assignee: Tztek Technology Co Ltd
Current assignee: Tztek Technology Co Ltd
Priority date: 2022-02-21
Filing date: 2022-02-21
Publication date: 2022-05-17

Abstract

The invention provides a double-sided inspection apparatus, comprising: the device comprises a feeding module, a material arranging module, a conveying module, an inspection module and a discharging module. According to the invention, the material arrangement module can be used for arranging the PCB conveyed by the material loading device, so that the PCB can be conveyed according to the required direction, and further image data acquisition during subsequent PCB visual inspection is facilitated. The conveying module comprises a first conveying unit and a second conveying unit, wherein a passage suitable for detecting the back surface of the PCB is formed between the first conveying unit and the second conveying unit, and therefore double-surface detection of the PCB is facilitated. And the first conveying unit and the second conveying unit are provided with adjusting rollers which can adjust the tension of the conveying belt, so that the conveying belt is prevented from slipping. The inspection module provided by the invention is provided with the lower inspection mechanism and the upper inspection mechanism, and the lower inspection mechanism and the upper inspection mechanism can realize image data acquisition in double-sided inspection of the PCB, thereby being beneficial to detecting the etching defects and appearance defects of the PCB.

Description

Double-side inspection equipment

Technical Field

The invention relates to the technical field of visual inspection, in particular to double-side inspection equipment suitable for a PCB.

Background

Many electronic devices are integrated on a PCB, and are widely used in electronic products and devices. In the production process of the PCB, the circuit patterns from the light panel to the circuit pattern are required to be manufactured through an etching process. For the finished PCB, appearance inspection is required to be performed to determine whether there is a line defect after the PCB is etched and whether there is an appearance defect on the surface of the finished PCB. Therefore, there is a need for further solutions to the above problems.

Disclosure of Invention

The invention aims to provide a double-sided inspection device to overcome the defects in the prior art.

In order to solve the technical problems, the technical scheme of the invention is as follows:

a double-sided inspection apparatus, comprising: the device comprises a feeding module, a material arranging module, a conveying module, an inspection module and a discharging module;

the material arranging module is arranged above the downstream section of the feeding module;

the material arranging module comprises a push plate, the push plate is arranged along the conveying direction of the feeding module, and the gap between the push plate and the feeding module is smaller than the thickness of a detected product;

carry the module with the butt joint of the downstream end of material loading module, it includes: a conveying mechanism;

the conveying mechanism includes: the conveying device comprises a first conveying unit and a second conveying unit which are arranged side by side along the conveying direction, and a gap is formed between the downstream end of the first conveying unit and the upstream end of the second conveying unit;

the inspection module comprises: a lower inspection mechanism and an upper inspection mechanism;

the lower inspection mechanism is arranged below a gap between the first conveying unit and the second conveying unit and is used for inspecting the back of the product; the upper inspection unit is positioned above the conveying belt of the second conveying unit and is used for inspecting the front surface of the product;

the discharging module is positioned at the downstream of the second conveying unit and is butted with the downstream end of the second conveying unit.

As an improvement of the double-sided inspection apparatus of the present invention, the monolith module further comprises: the second transmission mechanism and the second power mechanism;

the second power mechanism is a motor, and the motor is arranged on one side of the material arranging position;

the second transmission mechanism includes: the second driving belt wheel, the second driving wheel and the second driving belt;

the second driving wheel is arranged at the output end of the motor, the second driving belt wheel and the second driving wheel are arranged side by side and are positioned at the other side of the material arrangement position, and the second driving belt is sleeved on the second driving belt wheel and the second driving wheel; the push plate is connected with the second transmission belt through a connecting structure.

As an improvement of the double-sided inspection apparatus of the present invention, the monolith module further comprises: a buffer mechanism;

the buffer mechanism has elasticity, is arranged on the connecting structure and provides buffer acting force when the push plate pushes the product to be in place.

As an improvement of the double-sided viewing device of the invention, the connecting structure comprises: the connecting plate and the supporting bars;

the upper edge of the connecting plate is connected with the second transmission belt through a first connecting piece, the lower edge of the connecting plate is connected with connecting columns arranged at two ends of the push plate respectively through second connecting pieces, and the end parts of the connecting columns extend out of the corresponding second connecting pieces; two ends of the supporting bar are respectively connected with the extending ends of the connecting columns; the buffer mechanism is arranged between the second connecting piece and the supporting bar.

As an improvement of the double-sided inspection equipment, any conveying unit comprises: a conveyor belt, a support structure and a power structure;

the support structure includes: a support plate, a driven roller, a driving roller and an adjusting roller;

the adjusting roller is positioned below the supporting plate, the driven roller and the driving roller are distributed on two sides of the supporting plate, and the driving roller is driven by the power structure to pivot; the conveying belt sequentially bypasses the driven roller, the supporting plate, the driving roller and the adjusting roller and is tensioned by the driven roller, the supporting plate, the driving roller and the adjusting roller.

As an improvement of the double-side inspection equipment, two ends of the adjusting roller are arranged in a lifting manner through the adjusting component;

the adjustment assembly at either end includes: the device comprises an adjusting block, a fine adjustment screw and a scale;

the scale is provided with a sliding groove, and scales which are positioned on one side of the sliding groove and used for indicating the up-down adjusting distance are also arranged on the scale; install in the bearing of regulating roller tip is embedded in the regulating block, the regulating block set up in with sliding in the spout, the fine setting screw is followed the slip direction spiro union of regulating block in on the scale, and its lower extreme extends to in the spout and with the regulating block is connected.

As an improvement of the double-sided inspection apparatus of the present invention, any one of the inspection mechanisms comprises: a camera, a focusing assembly, and a light source assembly;

the number of the cameras is at least one, and at least one camera is arranged facing the image acquisition area; the focusing assembly is in transmission connection with the camera and drives the focusing assembly to be close to or far away from the image acquisition area; the light source assembly is arranged facing the image acquisition area and provides illumination for image acquisition of the camera.

As an improvement of the double-sided viewing apparatus of the present invention, the camera is further adjusted in five degrees of freedom by a fine adjustment assembly;

the fine tuning assembly comprises: an X-axis adjusting plate, a Y-axis adjusting plate, a Z-axis adjusting plate, a Y-axis pivoting adjusting plate and a Z-axis pivoting adjusting plate;

the X-axis adjusting plate is provided with a first adjusting groove extending in the X direction;

the Y-axis adjusting plate is mounted on the X-axis adjusting plate, and a second adjusting groove extending in the Y direction is formed in the Y-axis adjusting plate;

the Z-axis pivot adjusting plate is vertically connected to the Y-axis adjusting plate through a pivot;

two sides of the Z-axis adjusting plate are mounted on the Z-axis pivoting adjusting plate through a supporting frame, a Z-direction chute is arranged at the edge of the upper end of the supporting frame, and the Z-axis adjusting plate is arranged in the Z-direction chute in a front-back sliding manner;

the Y-axis pivoting adjusting plate is installed on the Z-axis adjusting plate, the camera is vertically arranged, and the rear end of the lens part of the camera is in pivoting connection with the Y-axis pivoting adjusting plate.

As an improvement of the double-sided viewing apparatus of the present invention, the light source assembly comprises: a first light source, a second light source, and a third light source; the light sources respectively have respective illumination angles.

As an improvement of the double-sided inspection equipment, the illumination direction of the first light source is kept vertical; the second light source is obliquely positioned on one side of the illumination direction of the first light source, and the illumination direction of the second light source forms an included angle with the vertical direction; the third light source is obliquely positioned on the other side of the illumination direction of the first light source, and the illumination direction of the third light source forms an included angle with the vertical direction;

the first light source includes: the light-emitting device comprises a first shell, a first light-emitting device arranged in the first shell and a first heat dissipation structure integrated on the first shell;

the second light source and the third light source have the same structure, and both comprise: the second heat dissipation structure is integrated on the back surface of the second light emitting device.

Compared with the prior art, the invention has the beneficial effects that:

according to the invention, the feeding module and the discharging module can be butted on a production line, so that continuous feeding and discharging of the PCB are realized, and online continuous appearance detection of the PCB is facilitated.

According to the invention, the material arrangement module can be used for arranging the PCB conveyed by the material loading device, so that the PCB can be conveyed according to the required direction, and further image data acquisition during subsequent PCB visual inspection is facilitated.

The conveying module comprises a first conveying unit and a second conveying unit, wherein a passage suitable for detecting the back surface of the PCB is formed between the first conveying unit and the second conveying unit, and therefore double-surface detection of the PCB is facilitated. And the first conveying unit and the second conveying unit are provided with adjusting rollers which can adjust the tension of the conveying belt, so that the conveying belt is prevented from slipping.

The inspection module provided by the invention is provided with the lower inspection mechanism and the upper inspection mechanism, and the lower inspection mechanism and the upper inspection mechanism can realize image data acquisition in double-sided inspection of the PCB, thereby being beneficial to detecting the etching defects and appearance defects of the PCB.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic perspective view of a double-sided inspection apparatus according to an embodiment of the present invention;

FIG. 2 is an enlarged perspective view of the loading module shown in FIG. 1;

FIG. 3 is an enlarged perspective view of the monolith module of FIG. 1;

FIG. 4 is an enlarged perspective view of a portion of the structure of FIG. 3;

FIG. 5 is an enlarged perspective view of the conveyor module shown in FIG. 1;

FIG. 6 is a perspective view of the bottom of the transport module of FIG. 5;

FIG. 7 is a perspective view of the first conveyor unit of FIG. 5 with the conveyor belt omitted;

FIG. 8 is an enlarged perspective view of the adjustment assembly of FIG. 7;

FIG. 9 is an enlarged perspective view of the guide mechanism and hold-down mechanism of FIG. 5;

FIG. 10 is an enlarged perspective view of the inspection module of FIG. 1;

FIG. 11 is an enlarged perspective view of one of the cameras of FIG. 10 and its trim assembly;

fig. 12 is an enlarged perspective view of the light source module of fig. 10;

FIG. 13 is an enlarged perspective view of a portion of the structure of FIG. 12;

fig. 14 is an enlarged perspective view of the discharging module shown in fig. 1.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

An embodiment of the present invention provides a double-side inspection apparatus, which can be used to inspect the appearance of a product to find surface defects that may exist on the upper and lower surfaces of the product. For example, the method can be used for inspecting circuit defects after PCB etching and appearance defects on the surface of a PCB finished product. The present embodiment takes a PCB as an example, and the technical solution is described as follows.

As shown in fig. 1, the double-side inspection apparatus of the present embodiment includes: a loading module 10, a material distributing module 20, a conveying module 30, an inspecting module 40 and a discharging module 50.

As shown in fig. 2, the feeding module 10 is used for feeding PCB boards, and includes: a feeding roller 11, a first transmission mechanism 12 and a first power mechanism 13.

The number of the feeding rollers 11 is a plurality, and the plurality of feeding rollers 11 are arranged side by side at intervals and pivotally installed between the two opposite first material roller frames 126. The first power mechanism 13 synchronously drives the feeding rollers 11 to perform pivoting motion through the first transmission mechanism 12. Thus, the PCB can be driven by a plurality of feeding rollers 11 and conveyed along the feeding direction.

The first power mechanism 13 may be a motor, and in cooperation therewith, the first transmission mechanism 12 includes: a first driving pulley 121, a first pressing wheel 122, a second pressing wheel 123, a first driving wheel 124 and a first driving belt 125.

At this time, one end of each of the loading rollers 11 is protruded from the first loading roller frame 126 on one side, and the first driving pulleys 121 are respectively attached to the protruded ends of the loading rollers 11. The first pressing wheels 122 are respectively located above or below the space between the first driving pulleys 121, and the wheel surfaces of the first pressing wheels 122 can extend into the area between two adjacent first driving pulleys 121. Preferably, the first pressing rollers 122 are located above and between the first driving pulleys 121. The first driving wheel 124 is installed at the output end of the motor, and the second pressing wheels 123 are located between the first driving wheel 124 and each of the first driving pulleys 121 and are distributed on two sides of the first driving wheel 124.

The first drive belt 125 passes around in sequence: the first driving pulley 124, the second pressing wheel 123 on one side, each first driving pulley 121, and the second pressing wheel 123 on the other side, and the first driving belt 125 is further pressed by each first pressing wheel 122, so as to realize the continuous tensioning of the first driving pulley 121. In this way, when the motor is operated, the driving pulley pivots, and the first driving pulley 125 in cooperation with the driving pulley further drives each first driving pulley 121 to pivot synchronously, so as to realize the feeding action of each feeding roller 11.

The material loading module 20 is located at a material loading position, which is specifically disposed above the downstream section of the material loading module 10, and is used for pushing the PCB board conveyed by the material loading module 10 to make the edge thereof abut against the first material roller frame 126 on one side, so as to correct the position thereof for subsequent visual inspection.

In order to ensure the material loading effect, the material loading action should be performed after the PCB board completely enters the plurality of material loading rollers 11. Accordingly, it is desirable that the length of the loading module 10 is at least greater than the length of the PCB board to be inspected, and the monolith module 20 is disposed adjacent to the downstream end of the loading module 10.

As shown in fig. 3 and 4, the monolith module 20 includes: the device comprises a seat plate 21, a push plate 22, a second transmission mechanism 23, a second power mechanism 24, a buffer mechanism 25 and a limiting mechanism 26.

Wherein, the seat boards 21 are arranged on two sides of the downstream section of the feeding module 10 in a bilateral symmetry manner.

The pushing plate 22 is used for pushing the PCB conveyed by the feeding module 10, and is located above the plurality of feeding rollers 11 and arranged along the feeding direction of the PCB. The lower edge of the push plate 22 abuts against the plurality of feeding rollers 11 or the gap between the lower edge of the push plate 22 and the plurality of feeding rollers 11 is smaller than the thickness of the PCB. Meanwhile, the lower edge of the push plate 22 is designed with a plurality of arc-shaped grooves arranged side by side, and each arc-shaped groove is arranged corresponding to each conveying roller so as to be matched with a plurality of feeding rollers 11.

The second power mechanism 24 can drive the push plate 22 to reciprocate along the length direction of the plurality of feeding rollers 11 through the second transmission mechanism 23, and further drive the push plate 22 to push the corresponding PCB.

The second power mechanism 24 may be a motor, and in cooperation therewith, the second transmission mechanism 23 includes: a second driving pulley 231, a second driving pulley 232, a second driving belt 233 and two guide rods 234.

In this case, the motor is disposed at one side of the monolith position and fixed to the seat plate 21 at the corresponding side. The second driving wheel 232 is installed at the output end of the motor, and the second driving pulley 231 and the second driving wheel 232 are arranged side by side and located at the other side of the material arranging position. The second belt 233 is sleeved on the second belt pulley 231 and the second driving pulley 232 to realize the linkage of the two. The push plate 22 is connected to the second belt 233 by a connecting structure 27.

Thus, when the motor works, the second driving pulley 232 is linked with the second driving pulley 231 through the second driving belt 233, and the pushing plate 22 connected to the second driving belt 233 can move along with the second driving pulley. Further, in order to improve the stability of the reciprocating movement of the push plate 22, two guide rods 234 are disposed in parallel and connected between the seat plates 21. The push plate 22 is movable along two guide rods 234.

The buffering mechanism 25 is used for providing a buffering force for the pushing plate 22 when pushing the PCB in place to protect the PCB, and the buffering mechanism 25 is disposed on the connecting structure 27.

Wherein, connection structure 27 includes: a connecting plate 271 and a support bar 272.

The upper edge of the connecting plate 271 is connected to the second belt 233 through a first connector 2711, and the lower edge is connected to connecting posts provided at both ends of the push plate 22 through second connectors 2712, respectively, and the ends of the connecting posts protrude from the corresponding second connectors 2712. The two ends of the supporting bar 272 are respectively connected with the extending ends of the connecting posts. The two guide rods 234 are provided through the connection plate 271.

At this time, the buffer mechanism 25 is disposed between the second connector 2712 and the supporting bar 272. Thus, when the pushing plate 22 pushes the PCB to make the edge of the PCB abut against the first material roller frame 126 on one side, the buffering mechanism 25 can provide a buffering action force to prevent the PCB from rigidly contacting the first material roller frame 126, thereby preventing the pushing plate 22 from crushing the PCB. In one embodiment, the buffer mechanism 25 may be a spring connected between the second connector 2712 and the support bar 272. Preferably, a spring is disposed at both ends between the supporting bar 272 and the second connector 2712 to provide uniform buffering force.

The limiting mechanism 26 is used for limiting the movement of the push plate 22 so that the push plate 22 moves within a set stroke range. This stop gear 26 includes: a first stopper and a second stopper. The first stopper is disposed at one end of the guide rod 234, and the second stopper is disposed at the other end of the guide rod 234.

In this manner, the push plate 22 can only move between the first and second stops as it moves along the guide rod 234. The guide rods 234 of the first stopper and the second stopper may be the same guide rod or different guide rods.

In one embodiment, the first limiting block and the second limiting block are arranged on a locking block on the guide rod, the locking block is composed of two parts buckled on the guide rod, and the two parts are connected in a locking mode through a screw rod.

As shown in fig. 5 and 6, the conveying module 30 is abutted against the downstream end of the feeding module 10, and further conveys the PCB after position correction by the material distributing module 20 to the inspecting module 40, and the PCB after double-side inspection is further sent out by the conveying module 30.

Wherein, carry module 30 to include: a conveying mechanism 31, a guide mechanism 32, and a pressing mechanism 33.

The conveying mechanism 31 includes: the first conveying unit 311 and the second conveying unit 312 are arranged side by side along the conveying direction, a gap 313 is arranged between the downstream end of the first conveying unit 311 and the upstream end of the second conveying unit, and a light-transmitting plate 314 is arranged at the gap 313. Thus, inspection of the bottom surface of the PCB is also facilitated by providing the above-described gap 313 while the front surface of the corresponding PCB is inspected.

In the present embodiment, each of the conveying

units

311 and 312 includes: a conveyor belt 315, a support structure 316, a power structure 317, and a deviation correcting structure 318.

The conveyor belt 315 is mounted and tensioned by a support structure 316 and is driven in an endless conveying motion by a power structure 317. In order to ensure that the speed of the PCB is consistent with the conveying speed of the conveyor belt 315 when the inspection module 40 starts scanning the PCB, at least 2/3 area of the PCB is ensured to contact with the conveyor belt 315.

Specifically, as shown in fig. 7, the support structure 316 includes: a seat plate 3161, a support plate 3162, a driven roller 3163, a drive roller 3164, and a regulation roller 3165.

At this time, the seat plates 3161 are arranged bilaterally symmetrically, and the support plate 3162, the driven roller 3163, the drive roller 3164, and the adjustment roller 3165 are arranged between the two seat plates 3161. The adjusting roller 3165 is located below the supporting plate 3162, the driven roller 3163 and the driving roller 3164 are distributed on two sides of the supporting plate 3162, and the driving roller 3164 is driven by the power structure 317 to pivot.

Accordingly, the conveying belt 315 passes around the driven roller 3163, the support plate 3162, the drive roller 3164, and the adjustment roller 3165 in this order, and is tensioned by the four. The power mechanism 317 may be a motor, and when the motor drives the driving roller 3164 to pivot, the driving roller 3164 drives the conveying belt 315 to perform a circular conveying motion around the driven roller 3163, the supporting plate 3162 and the adjusting roller 3165 by means of friction.

The supporting plate 3162 is used to sufficiently support the conveying surface of the conveying belt 315, and the supporting plate 3162 may be a single plate or may be composed of a plurality of portions arranged at intervals in a split manner. In the connection manner, both ends of the supporting plate 3162 may be mounted between the two seat plates 3161 by a connection member such as a bolt.

The drive roller 3164 and the driven roller 3163 are used to tension the conveying belt 315 from both sides. In this connection, the drive roller 3164 and the driven roller 3163 are each pivotally connected between two seat plates 3161. And one end of the driving roller 3164 is also in transmission connection with a motor installed at one side of the seat plate 3161. Thus, when the motor works, the driving roller 3164 in transmission connection with the motor synchronously pivots along with the motor, and the driven roller 3163 is linked with the driving roller 3164, so that the driving roller 3164 and the driven roller 3163 drive the conveying belt 315 to circularly convey through friction.

As shown in fig. 8, the dancer 3165 is used to tension the conveyor belt 315 from below. In the connection mode, two ends of the adjusting roller 3165 are arranged between the two seat plates 3161 in a lifting manner through the adjusting assembly 3166, and correspondingly, the two seat plates 3161 are provided with kidney-shaped grooves suitable for the end parts of the adjusting roller 3165 to extend out. The adjustment assembly 3166 at either end includes: an adjusting block 31661, a fine adjustment screw 31662, and a scale 31663.

At this time, the scale 31663 is installed on the outer side wall of the seat plate 3161, the scale 31663 has a sliding groove corresponding to the kidney-shaped groove, and the scale 31663 is further provided with a scale indicating an up-down adjustment distance on one side of the sliding groove. A bearing 31651 attached to an end of the adjustment roller 3165 is fitted into the adjustment block 31661, and the adjustment block 31661 can further move up and down along the slide groove.

In order to control the up-and-down movement of the adjusting block 31661, the fine adjustment screw 31662 is screwed on the scale 31663 along the sliding direction of the adjusting block 31661, and its lower end extends into the sliding groove and is connected with the adjusting block 31661. Thus, when the fine adjustment screw 31662 is rotated, the adjustment block 31661 connected to the fine adjustment screw can be adjusted up and down according to the scale.

In one embodiment, the scale 31663 is an inverted U-shaped structure. At this time, the adjusting block 31661 is slidably disposed between the two U-shaped arms. In order to avoid the forward and backward shaking of the adjusting block 31661, the inner side walls of the two U-shaped arms are further provided with limiting parts which are abutted against the adjusting block 31661, so that the inner side walls of the U-shaped arms are of a step structure. When the fine adjustment screw 31662 is adjusted, the adjustment block 31661 slides up and down along the step structure.

The deviation rectifying structure 318 is used to assist the conveying belt 315 to keep at the set position, so as to prevent the deviation from affecting the conveying effect. The deviation rectifying structure 318 includes a plurality of deviation-proof rollers disposed below the conveying belt 315, and each deviation-proof roller is pivotally disposed below the conveying belt 315 and presses the bottom of the conveying belt 315. Correspondingly, a roller shaft which is convenient for the anti-deviation press roller to be in pivot connection is arranged below the conveying belt 315.

In one embodiment, the number of the deviation-preventing press rollers is four. The four deviation-preventing press rollers are symmetrically arranged on the left side and the right side below the conveying belt 315, two of the deviation-preventing press rollers are arranged close to one end of the conveying belt 315, and the other two deviation-preventing press rollers are arranged close to the other end of the conveying belt 315. Thus, the four deviation-preventing press rollers are matched with the adjusting roller 3165 to jointly realize the deviation correction of the conveying belt 315.

As shown in fig. 9, the guide mechanism 32 is used for further guiding the PCB conveyed by the feeding module 10 so that the PCB can be smoothly fed into the downstream conveying mechanism 31.

Wherein, guiding mechanism 32 includes: a guide bar 321 and a guide plate 322.

The guide strip 321 is disposed at a seam between the downstream end of the feeding module 10 and the upstream end of the conveying mechanism 31. The guide plate 322 is disposed above the upstream end of the conveying mechanism 31, and includes: a guide surface 3221 obliquely arranged in the conveying direction, and a horizontal surface 3222 connected to a lower end of the guide surface 3221. The upper end of the guide plate 322 is further connected to a cross member. In this manner, the PCB board can be fed along the guide bar 321, the guide surface 3221 and the horizontal surface 3222 into the downstream conveying mechanism 31.

The pressing mechanism 33 is used for contacting with the PCB, thereby preventing the PCB from tilting, so as to facilitate image acquisition of the subsequent inspection module 40. And the friction between the PCB and the conveyor belt 315 can be increased to ensure the stability of the scanning speed.

Wherein, hold-down mechanism 33 includes: at least one pressure roller 331. In one embodiment, the two pressing rollers 331 are provided, and the two pressing rollers 331 are disposed above the upstream end and the downstream end of the first conveying unit 311 and maintain a proper distance from the conveying belt 315 of the first conveying unit 311, the distance being equal to or slightly smaller than the thickness of the corresponding PCB panel. Meanwhile, the pressure roller 331 is composed of a roller shaft and a plurality of pressure rings axially arranged on the roller shaft at intervals. So, be favorable to reducing the area of contact of pinch roller 331 and PCB board, and then protect the PCB board.

The inspection module 40 is disposed at the second conveying unit 312, and is configured to perform a double-sided inspection on the PCB conveyed by the second conveying unit 312, so as to inspect circuit defects and appearance defects on the surface of the finished PCB after the PCB is etched.

The detection principle is as follows: the inspection module 40 can collect the image of the PCB, and then sends the collected image data to the host of the system, and the host processes the image data through a preset algorithm, and then determines whether the corresponding PCB has quality problems, and feeds back the detection result. When the host computer processes the image data, the collected image data can be identified so as to judge whether the corresponding PCB has defects.

As shown in FIG. 10, the inspection module 40 includes: a lower inspecting mechanism 41, an upper inspecting mechanism 42, and a thickness detecting mechanism 43.

The lower inspection mechanism 41 is arranged below the gap between the first conveying unit 311 and the second conveying unit 312 and is used for realizing the inspection of the back surface of the PCB; the upper inspecting unit is disposed downstream of the lower inspecting mechanism 41 and above the conveying belt 315 of the second conveying unit 312, and is used for inspecting the front surface of the PCB.

Either of the

inspection mechanisms

41, 42 includes: a camera 411, a focusing assembly 412, and a light source assembly 413.

The camera 411 is used for collecting image data of the front side or the back side of the PCB. In order to perform full-coverage acquisition on the image of the PCB in the width or length direction, the number of the cameras 411 may be one or more. When the number of the cameras 411 is plural, the plural cameras 411 are arranged side by side at intervals facing the image capturing area, and are synchronously focused by the adjusting member 3166.

In this embodiment, the camera 411 can be adjusted in five degrees of freedom by the fine adjustment assembly 414 while being adjusted by the focusing assembly 412, so as to perform fine adjustment on the angle and position of the camera 411, and further meet the actual requirements of image acquisition.

As shown in fig. 11, the fine tuning component 414 includes: an X-axis adjusting plate 4141, a Y-axis adjusting plate 4142, a Z-axis adjusting plate 4143, a Y-axis pivot adjusting plate 4144, and a Z-axis pivot adjusting plate 4145.

The X-axis adjusting plate 4141 is mounted on the fixing plate 411, and a first adjusting groove 41411 extending in the X direction is formed at an edge position of the X-axis adjusting plate 4141. Preferably, the first adjustment groove 41411 is plural, and a plurality of first adjustment grooves 41411 are distributed at upper and lower end edges of the X-axis adjustment plate 4141. In this way, during adjustment, the X-axis adjustment plate 4141 is translated left and right through the first adjustment groove 41411, and fine adjustment of the X-axis adjustment plate 4141 in the X direction can be achieved.

The Y-axis adjusting plate 4142 is mounted on the X-axis adjusting plate 4141, and a second adjusting groove 41421 extending in the Y-direction is formed at an edge position of the Y-axis adjusting plate 4142. Preferably, the second adjusting groove 41421 is plural, and the plural second adjusting grooves 41421 are distributed at left and right left edges of the Y-axis adjusting plate 4142. In this way, during adjustment, the Y-axis adjustment plate 4142 is translated up and down through the second adjustment groove 41421, and fine adjustment of the Y-axis adjustment plate 4142 in the Y direction can be achieved.

The Z-axis pivot adjustment plate 4145 is connected to the Y-axis adjustment plate 4142 by a pivot shaft that is perpendicular to the Y-axis adjustment plate 4142. In this manner, upon adjustment, fine pivotal adjustment of the Z-axis pivot adjustment plate 4145 about the Z-axis can be achieved by rotating the Z-axis pivot adjustment plate 4145.

In addition, in order to limit the Z-axis pivoting adjustment plate 4145, a limiting member 41422 is provided on the Y-axis adjustment plate 4142, which allows the Z-axis pivoting adjustment plate 4145 to be pivotally adjusted within a certain angle range. In one embodiment, the position-limiting member 41422 is a U-shaped position-limiting groove, and the extending portion 41451 of the Z-axis pivoting adjustment plate 4145 can extend into the U-shaped position-limiting groove with a certain distance between the two sides and the U-shaped position-limiting groove. Thus, when the extending portion 41451 abuts against the groove wall on the U-shaped stopper groove side as the Z-axis pivoting adjustment plate 4145 pivots, the Z-axis pivoting adjustment plate 4145 is stopped.

Both sides of the Z-axis adjusting plate 4143 are mounted on the Z-axis pivot adjusting plate 4145 through support brackets 4146. At this time, the upper end edge of the supporting bracket 4146 is provided with a Z-direction slide groove in which the Z-axis adjusting plate 4143 is slidably provided back and forth. In order to control the fine adjustment of the Z-axis adjusting plate 4143, a fine adjustment screw 4147 is screwed to the front end of the Z-axis adjusting plate 4143, and the fine adjustment screw 4147 is fixed by a clamping groove of the supporting frame 4146. Thus, by rotating the nut of the fine adjustment screw 4147, the Z-axis adjustment plate 4143 is driven to translate back and forth, thereby achieving fine adjustment of the Z-axis adjustment plate 4143 in the Z-direction.

A Y-axis pivot adjusting plate 4144 is mounted on the Z-axis adjusting plate 4143, the camera 411 is vertically arranged, and the rear end of the lens portion thereof is pivotally connected to this Y-axis pivot adjusting plate 4144. In one embodiment, the rear end of the lens portion is pivotally connected to the Y-axis pivot adjustment plate 4144 by fine threads. As such, by rotating camera 411, it can be fine tuned for pivoting about the Y-axis.

The focus assembly 412 includes: screw 4121, connecting block and rotary unit 4123.

Wherein, the rotating unit 4123 is in transmission connection with one end of the screw rod 4121, one end of the connecting block is in screw connection with the screw rod 4121, and the other end is connected with the back of the camera 411 fixing plate. Thus, when the rotating unit 4123 operates, it drives the screw 4121 to pivot synchronously. At this time, the connecting block can ascend or descend along with the pivoting of the screw 4121, and then drives the camera 411 fixing plate connected with the connecting block and the camera 411 thereon to ascend or descend, so as to adjust the focal length of the camera 411 relative to the PCB. In one embodiment, the rotation unit 4123 may be a servo motor or an adjustment handwheel.

The light source module 413 is used for providing illumination for image acquisition of the camera 411, is disposed between the camera 411 and the PCB, and is disposed toward an image acquisition area of the camera 411.

As shown in fig. 12, in order to provide multi-angle illumination, the light source assembly 413 includes: a first light source 4131, a second light source 4132, a third light source 4133, and a light source fixing plate 4134. The first light source 4131, the second light source 4132 and the third light source 4133 are installed between the light source fixing plates 4134, and each light source has an illumination angle.

In one embodiment, the illumination direction of the first light source 4131 remains vertical. The second light source 4132 is obliquely positioned at one side of the illumination direction of the first light source 4131, and the illumination direction thereof has an angle with the vertical direction. The third light source 4133 is obliquely positioned on the other side of the illumination direction of the first light source 4131, and the illumination direction thereof forms an angle with the vertical direction. Preferably, the angle is acute.

Thus, under the cooperative illumination of the first light source 4131, the second light source 4132 and the third light source 4133, since the three have different illumination angles, the shadow interfering with the image acquisition in the image acquisition area of the camera 411 can be avoided. And by adopting the light source assemblies with different illumination angles, the illumination range is larger, and the image data acquisition of the camera is facilitated.

Meanwhile, the illumination angles of the second light source 4132 and the third light source 4133 can be further adjusted in a pivoting manner and fine-tuned in a left-right translation manner. The implementation of the adjustment will be described below by taking the second light source 4132 as an example.

As shown in fig. 13, two ends of the second light source 4132 are pivotally connected to the pad 4135 of the light source fixing plate 4134, and the pad 4135 is provided with an arc-shaped adjusting groove 41351, wherein the arc-shaped adjusting groove 41351 is located at one side of the pivot. As such, the second light source 4132 may pivot about the pivot within the angular range defined by the arc-shaped adjustment groove 41351.

In addition, in order to facilitate the left-right translation adjustment of the second light source 4132, the spacer 4135 is further provided with a third adjusting groove 41352 which is transversely arranged. In one embodiment, the third adjustment groove 41352 is provided to upper and lower end edges of the pad 4135. Thus, when the second light source 4132 and the spacers 4135 at both ends are translated relative to the light source fixing plate 4134 through the third adjustment groove 41352, fine adjustment of the left-right translation of the second light source 4132 can be achieved.

As shown again in fig. 13, the first light source 4131 includes: the first light emitting device 41311 includes a first housing 41311, a first light emitting device 41312 disposed in the first housing 41311, and a first heat dissipation structure 41313 integrated on the first housing 41311.

The first light emitting device 41312 may be a linear light source. Both ends of the first housing 41311 are connected to the light source fixing plate 4134. The first housing 41311 is provided therein with an installation cavity for the first light emitting device 41312, and the first housing 41311 is further provided with a light outlet suitable for emitting light emitted by the first light emitting device 41312, and the light outlet is disposed facing the image capturing area.

In one embodiment, the first light emitting device 41312 may be disposed facing the light outlet. Alternatively, the light of the first light-emitting device 41312 may be changed by providing an optical device. At this time, the second housing further includes a reflector 41314 disposed on one side of the first light-emitting device 41312, and the reflector 41314 can change the light emitted from the first light-emitting device 41312 to emit the light from the light-emitting opening.

The first heat dissipation structure 41313 includes: the heat dissipating fins 413131 and/or the first fan 413132 integrated at one side of the first housing 41311. And the heat dissipating fins 413131 and the first fan 413132 are integrated with the first housing 41311 outside the mounting cavity. Therefore, heat generated by the first optical device during working can be timely conducted out, and overhigh temperature in the installation cavity is avoided.

The heat dissipating fins 413131 may integrally extend from a side wall surface of the first housing 41311. And when the first light emitting device 41312 employs a line light source, the first fan 413132 may employ a plurality of sets in order to achieve uniform air blowing. At this time, the plurality of sets of first fans 413132 are disposed side by side on one side of the first housing 41311.

In one embodiment, the first heat dissipation structure 41313 includes: a heat radiating fin 413131 integrated at one side of the first housing 41311 and a first fan 413132. At this time, the first fan surface 413132 is disposed toward the heat dissipation fins 413131, and further blows air toward the heat dissipation fins 413131, which assists in dissipating heat from the heat dissipation fins 413131 to improve heat dissipation effect.

The second light source 4132 and the third light source 4133 have the same structure. The structures of the second light source 4132 will be described below. The second light source 4132 includes: a second light emitting device 41321, and a second heat dissipation structure 41322 integrated on a rear surface of the second light emitting device 41321.

The second light emitting device 41321 may be a linear light source. As described above, both ends of the second light emitting device 41321 are connected with the light source fixing plate 4134 through the spacer 4135. The second heat dissipation structure 41322 includes: and a second fan integrated at the back of the second light emitting device 41321. When the second light emitting device 41321 employs a linear light source, a plurality of groups of second fans may be employed in order to achieve uniform heat dissipation. At this time, a plurality of sets of second fans are disposed side by side on the back of the second light emitting device 41321.

The thickness detection mechanism 43 is located upstream of the lower inspection mechanism 41 and the upper inspection mechanism 42, and is disposed at an upstream end of the first conveyance unit. The thickness detection mechanism 43 may employ a line laser transmitter, which measures the thickness of the PCB board by sensing the thickness variation of the corresponding region.

As shown in fig. 14, the outfeed module 50 is positioned downstream of the second conveyor unit 312 and interfaces with a downstream end of the second conveyor unit 312. Ejection of compact module 50 is used for realizing the ejection of compact of the PCB board after the visual inspection, and it includes: a plurality of discharge rollers 51. A plurality of discharge rollers 51 are spaced side-by-side and pivotally mounted between two opposing second stock roller stands 52. Thus, the PCB can be discharged through the conveying of the discharging rollers 51.

To effect pivoting of each exit roller 51, the outfeed module 50 may be provided with a power mechanism. Alternatively, the power structure may be shared with the second conveying unit 312. At this time, the driving roller 3164 of the second conveying unit 312 has a driving wheel 53 mounted at the other end thereof, and the end of each discharge roller 51 extends from the second material roller holder 52 at the corresponding side, and the driving wheel 53 is mounted on the extending end of each discharge roller 51. In order to realize the interlocking of the transmission wheels 53, a transmission belt (not shown) is fitted between any two adjacent transmission wheels 53. Correspondingly, two belt grooves suitable for sleeving the driving belts are arranged side by side on any driving wheel 53.

In order to protect the surface of the PCB, the contact area between the discharging roller 51 and the PCB should be reduced as much as possible while ensuring the conveying power. At this time, any one of the discharging rollers 51 includes: a discharge roller 51 shaft and a plurality of conveying rings axially arranged on the discharge roller 51 shaft at intervals. Thus, each discharging roller 51 contacts with the PCB through its conveying ring, and drives the PCB to perform discharging conveying.

In conclusion, the feeding module and the discharging module can be butted on a production line, so that continuous feeding and discharging of the PCB are realized, and online continuous appearance detection of the PCB is facilitated.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A dual-sided inspection apparatus, comprising: the device comprises a feeding module, a material arranging module, a conveying module, an inspection module and a discharging module;

2. The dual sided inspection apparatus of claim 1, wherein the monolith module further comprises: the second transmission mechanism and the second power mechanism;

3. The double-sided inspection apparatus of claim 2, wherein the monolith module further comprises: a buffer mechanism;

4. The dual-sided inspection apparatus of claim 3, wherein the connecting structure comprises: the connecting plate and the supporting bars;

5. The double-sided inspection apparatus of claim 1, wherein any one of the transport units comprises: a conveyor belt, a support structure and a power structure;

6. The double-sided inspection apparatus of claim 5, wherein both ends of the adjustment roller are elevationally disposed by an adjustment assembly;

7. The dual sided inspection apparatus of claim 1, wherein any inspection mechanism comprises: a camera, a focusing assembly, and a light source assembly;

8. The dual sided inspection apparatus of claim 7, wherein the camera is further adjusted in five degrees of freedom by a fine adjustment component;

9. The dual sided inspection apparatus of claim 7, wherein the light source assembly comprises: a first light source, a second light source, and a third light source; the light sources respectively have respective illumination angles.

10. The dual side inspection apparatus of claim 9, wherein the illumination direction of the first light source remains vertical; the second light source is obliquely positioned on one side of the illumination direction of the first light source, and the illumination direction of the second light source forms an included angle with the vertical direction; the third light source is obliquely positioned on the other side of the illumination direction of the first light source, and the illumination direction of the third light source forms an included angle with the vertical direction;

the first light source includes: the LED lamp comprises a first shell, a first light-emitting device arranged in the first shell and a first heat dissipation structure integrated on the first shell;