TW202326060A - Through hole inspection equipment for printed circuit board - Google Patents

Abstract

The present disclosure provides a through hole inspection equipment for printed circuit board, wherein the equipment is configured for through-hole inspection of a circuit board, wherein the equipment comprises: a base; an optical inspection device, configured to be erected above the an inspection position of the base; a work platform, comprising a bottom platform and an upper cover pivotally connected to each other, and configured to be slidably arranged on a slide rail of the base; a lift mechanism, comprising a support plate, a power mechanism and a lift arm, wherein the support plate is fixed on the base, the power mechanism is configured to drive the lift arm to rotate relative to the support plate; and the work platform is configured to be able to move along the slide rail between a loading position and the inspection position; when the work platform is located at the loading position and the power mechanism is driving the lift arm to rotate upward, the upper cover is open driven by the lift arm. The present disclosure provides an open-close work platform to ensure the flatness of the circuit board therein, and sets the work platform and the lift mechanism as a separate structure to improve the motion accuracy, mechanical stability and speed of the work platform, thereby improving accuracy and efficiency of inspection.

Description

PCB through hole inspection equipment

The invention relates to the field of circuit board detection, in particular to a PCB through-hole detection device.

Printed Circuit Board (hereinafter referred to as PCB) is an important electronic component, a support for electronic components, and a carrier for electrical interconnection of electronic components. Manufacturers of PCB circuit boards conduct appearance inspections to identify them good or defective.

According to the nature of the circuit board, it is at least divided into through-hole circuit boards and circuit boards (non-through-hole circuit boards). The appearance inspection of circuit boards in the prior art is usually aimed at the appearance inspection of circuit boards. The inspection content such as whether the circuit is missing solder , Multi-welding. During detection, the circuit board needs to be placed in a reference plane, and the circuit board is scanned by the line scan camera of the AOI (Automated Optical Inspection) equipment, and finally the imaging of the circuit board is obtained by splicing. It can be said that the flatness of the circuit board on the reference plane determines This further affects the accuracy of appearance detection. Therefore, in the prior art, an air supply interface is provided on the reference platform to connect the vacuum generator, and the circuit board is closely attached to the reference platform by vacuuming to ensure its flatness on the reference plane.

However, since the detection purpose of the through-hole circuit board is to identify whether the through-hole of the circuit board is inclined or whether the aperture is too large or too small, the backlight design is the basic requirement of the PCB through-hole detection platform. Because of the design of the backlight platform, it will not be possible to adopt the traditional The vacuum suction method is used to fix the circuit board to be tested on the platform, so the above-mentioned vacuum-suction reference platform is not suitable for through-hole circuit boards for through-hole detection.

The purpose of the present invention is to provide a PCB through-hole detection device with high motion precision and ensure that the circuit board to be detected is in the reference plane, so as to improve the detection accuracy.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows:

A PCB through-hole detection device is used for through-hole detection on a circuit board. The circuit board to be detected is provided with a through-hole. The content of the through-hole detection is to detect whether the through-hole meets a preset condition. PCB through hole inspection equipment includes:

The abutment is provided with a feeding position and a detection position;

an optical detection device, which is erected above the detection position of the abutment;

The working platform includes a bottom platform and an upper cover, the working platform is slidably arranged on the slide rail of the base platform, the upper cover is made of transparent material, and the upper cover is pivotally connected to the bottom platform;

A lifting mechanism, which includes a support plate, a first power mechanism, and a lifting arm, wherein the support plate is fixed on the base, and driven by the first power mechanism, the lifting arm moves relative to the support plate turn;

The working platform is configured to be able to move between the loading position and the detecting position along the slide rail, and the frame of the upper cover is provided with a docking assembly that cooperates with the lifting arm. When the working platform When it is at the loading position and the first power mechanism drives the lifting arm to rotate upward, the lifting arm drives the docking assembly so that the upper cover turns upward relative to the bottom platform.

Further, the detection position is set at the rear of the abutment table, and the loading position is set at the front of the abutment table;

The pivot shaft between the upper cover and the bottom platform is arranged at the rear or left or right part of the upper cover.

Further, the projection of the docking assembly on the plane where the bottom platform is located does not coincide with the bottom platform;

When the first power mechanism drives the lifting arm to rotate upward, the lifting arm pushes or pulls the docking assembly.

Further, the docking assembly is provided on one side of the upper cover, or the docking assembly is provided on opposite sides of the upper cover;

Each docking assembly includes two oppositely arranged limiting pieces and a sliding shaft arranged between the two limiting pieces, and there is a space for accommodating part of the lifting arm between the two limiting pieces, and the first power mechanism When the lifting arm is driven to rotate upward, the lifting arm is in contact with the sliding shaft.

Further, one end of the lift arm is rotatably connected to the support plate, and the other end is provided with a hook structure.

Further, the bottom platform includes a glass layer, a dodging layer and a backlight plate arranged under the glass layer, wherein the backlight board is arranged under the dodging layer;

At least one side of the glass layer is provided with an inwardly recessed avoidance structure, and one or more suction nozzles are provided on the bottom platform corresponding to the avoidance structure, and the upper surface of the suction nozzle is in contact with the glass layer. The upper surface of the layer is flush.

Further, the PCB through-hole detection equipment also includes more than two locking mechanisms, each locking mechanism includes a second power mechanism, a lock tongue part and a lock hole part, wherein the second power mechanism and the lock tongue part are arranged on the bottom On the platform, the keyhole part is arranged on the upper cover;

When the upper cover is fastened on the bottom platform, the lock tongue part is opposite to the opening of the lock hole part, and the second power mechanism is configured to drive the lock tongue part to extend into the lock hole department.

Further, the lock hole portion includes at least one surface that has an inward tightening tendency in a direction away from the lock tongue portion, and the locking mechanism is configured such that after the lock tongue portion is inserted into the lock hole portion, the The lock tongue part is against the surface with a tendency to tighten inward.

Further, the bottom platform has a rectangular structure, and floating PIN seats are provided on adjacent two sides of the bottom platform, and the floating PIN seats include a Pin post and an elastic member arranged under the Pin post, when the elastic When the component is in a natural state, the height of the upper surface of the Pin column is higher than the height of the upper surface of the bottom platform;

When the upper cover is buckled on the bottom platform, the upper cover presses against the Pin post so that the elastic member is in a compressed state.

Further, the pivotal connection part between the upper cover and the bottom platform is a floating turning shaft.

Further, the first power mechanism is a guide rod cylinder, one end of which is fixed on the lower surface of the front part of the support plate, and the other end extends backward; the front end of the lifting arm is pivotally arranged above the support plate, and then The end extends backward; the support plate is provided with a perforation, and the other end of the guide rod cylinder is connected to the middle part of the lifting arm through the arc arm passing through the perforation;

The support plate is arranged in the area below the side of the bottom platform, the docking assembly is arranged on the lower side of the frame of the upper cover, the lifting arm is arranged below the docking assembly, and the first power mechanism When the lifting arm is driven to rotate upwards, the lifting arm pushes the docking assembly.

The beneficial effects brought by the technical solution provided by the invention are as follows:

a. The open and close working platform is adopted to ensure the flatness of the through-hole circuit board to be tested and improve the detection accuracy;

b. The working platform and the lifting mechanism adopt a separate structure. The working platform does not mount a heavy mechanism during the movement, which improves the movement accuracy, mechanical stability and movement speed of the working platform, thereby improving the detection accuracy and detection efficiency.

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terms "first" and "second" in the specification and scope of claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific order or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, means, product or equipment comprising a series of steps or elements need not be limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

In one embodiment of the present invention, a PCB through-hole detection device is provided, which is used for through-hole detection of circuit boards. The circuit board to be tested is provided with through-holes, and the detection of through-holes is different from that of non-through-hole circuit boards. The difference is that the backlight requirements of the platform carrying the circuit board are different: if the circuit board with non-through holes is tested, only a supplementary light device needs to be installed above the circuit board, and there is no need to install a backlight on the loading platform, but a Set up a vacuum adsorption mechanism to adsorb and fix the PCB circuit board to be tested to ensure that the circuit board is on a standard (not inclined) horizontal plane; if the circuit board with through holes is tested, a backlight must be installed on the loading platform , so that there is a bright light under the circuit board to illuminate the area in the through hole, and realize the detection of the through hole of the circuit board. Whether the size exceeds the standard, whether the through hole is tilted and offset, etc., as shown in Figure 1-2, the PCB through hole detection equipment includes a base 1, an optical detection device 8, a working platform, and a lifting mechanism, and checks for each of them. illustrate:

The base 1 is provided with a feeding position and a detection position on it. The feeding position is a position convenient for feeding the PCB circuit board to be detected, and the detection position is a position where the PCB circuit board can be detected. In this implementation In the example, as shown in Figure 4, the feeding position is located at the front of the table of the base 1, and the detection position is located at the rear of the table of the base 1, and a slide rail 11 is provided between the feeding position and the detection position, and the left and right direction of the base Defined as the X axis, the extension direction of the slide rail 11 is the Y axis.

Optical detection device 8, which is erected above the detection position of the base 1, as shown in Figure 1, a crossbeam is erected at the rear of the table top of the base 1, for mounting the optical detection device 8, the optical detection device 8 can be Using the AOI (Automated Optical Inspection) equipment in the prior art, the AOI equipment can move laterally along the X-axis along the beam.

Working platform, it comprises bottom platform and upper cover 21, and described working platform is slidably arranged on the slide rail 11 of described abutment 1, and described upper cover 21 is made of transparent material, and described upper cover 21 and described bottom platform Pivotally connected, that is, the upper cover 21 can be turned over with respect to the bottom platform; specifically, referring to FIGS. Wherein, the backlight panel 24 can be arranged under the uniform light layer 23, and in the case of a larger working platform area, the number of backlight panels 24 can be multiple and spliced together; the glass layer 22 can be Select the optical glass with good light transmittance and flatness, the glass layer 22 provides a reference plane for placing the PCB circuit board, when the PCB circuit board is placed on the glass layer 22, the light emitted by the backlight board 24 is incident on the The uniform light layer 23 passes through the light uniform layer 23 and then provides illumination for it from the bottom of the circuit board. The light can be evenly distributed in the process of passing through the light uniform layer 23, so as to ensure that no matter whether it is near the edge or not on the circuit board. It is also the brightness uniformity in the through hole in the central area, and the detection accuracy is improved, which is reflected in at least the following two aspects: one is to avoid the light transmission intensity of a part of the circuit board through hole being excessively higher than the light transmission intensity of the other part of the circuit board through hole. Cause false detection, and the second is to avoid local through-holes of individual circuit boards being too dark to perform detection.

Lifting mechanism, it can not move forward and backward along with the working platform, it comprises support plate 31, first power mechanism 34 and lift arm 32, wherein, described support plate 31 is as a large connecting support plate, and it is fixed on the described base On the table 1, a reliable and stable support is provided for the lifting mechanism. Driven by the first power mechanism 34, the lifting arm 32 rotates relative to the support plate 31. See Figures 5 and 6 for details. The first power mechanism 34 is a long-stroke guide rod cylinder, one end of which is fixed on the lower surface of the front part of the support plate 31, and the other end extends backward; the front end of the lifting arm 32 is pivotally arranged on the upper surface of the support plate 31, Its rear end extends backward; the support plate 31 is provided with a perforation, and the other end of the guide rod type cylinder is connected with the middle part of the lifting arm 32 through the arc arm 33 passing through the perforation, and the arc arm 33 The linear motion of the guide rod cylinder is converted into the rotation of the lifting arm 32. In summary, the guide rod cylinder is used as the main lifter, and the swing base at the tail is suspended and installed on the bottom of the support plate 31 to form a fixed rotation point. The guide rod The double knuckle joint of the guide rod head of the type air cylinder movably connects the arc arm 33 to form a variable rotation point with it, and then the arc arm 12 cooperates with a lifting arm 32 with a fixed rotation point on the support plate 31 so that A change in flip angle is realized. In this embodiment, a travel switch 35 is also arranged on the supporting plate 31, which is used to trigger the guide rod cylinder to start to move, or to trigger the guide rod cylinder to stop working. Obviously, intelligent sensing technology can also be used. For example, when it is detected that the working platform moves to the feeding position, the main controller automatically controls the first power mechanism 34 to act; , the main controller controls the first power mechanism 34 to stop acting.

The working platform is configured to be able to move between the feeding position and the detection position along the slide rail 11, that is, the upper cover 21 and the bottom platform move between the feeding position and the detection position synchronously. The working platform is at the loading position, and when the first power mechanism 34 drives the lifting arm 32 to rotate upward, the lifting arm 32 drives the upper cover 21 to rotate upward. Referring to Fig. 1, Fig. 4, and Fig. 5, there are two lifting mechanisms, which are respectively arranged on both sides of the working platform, so that when the upper cover 21 is flipped open relative to the bottom platform, the lifting mechanisms on the left and right sides apply force synchronously , reduce the torsional force on the pivoting parts between the upper cover 21 and the bottom platform, and also make the opening and closing process of the upper cover 21 more stable, especially avoid the impact of the closing process on the circuit board placed on the bottom platform and make it to be detected The circuit board deviates from its original position. However, it should be noted that the scope of protection required by the present invention covers the technical solution of installing the lifting mechanism on both sides of the working platform, as well as the technical solution of installing the lifting mechanism on one side. The purpose of the technical effect brought by the installation on both sides mentioned above is not It is to negate or exclude the feasibility of the technical solution of unilaterally installing the lifting mechanism.

The lifting mechanism in this embodiment is fixed on the base 1 as a whole. In other words, the lifting mechanism does not move back and forth with the working platform, so that the overall weight of the working platform is reduced. The working process of the circuit board through-hole detection equipment of the present embodiment is as follows:

After/when the working platform moves to the feeding position, operate the limit switch 35 to start the lifting mechanism, that is, the first power mechanism 34 drives the lifting arm 32 to rotate upwards. If the lifting arm 32 is below the upper cover 21, the lifting arm 32 is rotating upward. Push the upper cover 21 during the process, and then make it turn upwards relative to the bottom platform, see Figure 3 and Figure 4, wherein Figure 3 is the state before starting the lifting mechanism, and Figure 4 is the state where the lifting arm 32 pushes the upper cover 21; if the lifting arm 32 Above the upper cover 21, the lifting arm pulls the upper cover 21 to turn up (not shown) during the upward rotation process, but those skilled in the art can make a simple structural arrangement, such as setting a pull ring on the upper surface of the cover plate. The free end of the arm 32 is provided with a drag hook to cooperate with the pull ring to realize pulling. The above two ways of pushing/pull can make the upper cover 21 turn over and open relative to the bottom platform, and the opening of the upper cover 21 relative to the bottom platform can be as shown in Figure 1 and Figure 4 The shown faces forward, that is, the pivot axis between the upper cover 21 and the bottom platform is set at the rear of the upper cover 21, obviously, the opening can also face to the left (the pivot axis between the upper cover 21 and the bottom platform is set on the right side of the upper cover 21 ) or the right side (the pivot shaft between the upper cover 21 and the bottom platform is set on the left part of the upper cover 21) (not shown). When the lifting mechanism is activated, the software control work platform cannot be driven to move along the slide rail 11, which is safe and reliable; when the upper cover 21 and the bottom platform are closed, the work platform can be driven to move along the slide rail 11.

When the upper cover 21 is opened relative to the bottom platform, the through-hole circuit board to be detected can be placed on the glass layer 22 of the bottom platform manually or by a manipulator, and then the lifting mechanism is closed by operating the travel switch 35, then the lifting The arm 32 returns to the initial position, that is, it is naturally separated from the upper cover 21. The upper cover 21 also adopts optical glass with high light transmission and high flatness. At this time, the upper cover 21 is set on the top of the circuit board. In order to adapt to circuit boards of different thicknesses, the pivotal connection part between the upper cover 21 and the bottom platform in this embodiment is a floating flip shaft 7, and the floating flip shaft 7 has a U-shaped slot, thereby realizing The thickness of the PCB board to be tested can automatically adjust the height gap between the upper cover 21 and the bottom platform. The purpose is to automatically change and adjust with the thickness of the PCB board to ensure that the upper cover 21 and the circuit board/glass layer 22 on the top of the circuit board are covered. The reference planes are kept parallel to prevent the upper cover 21 from being lower in the front and higher in the rear when it is placed on a thin circuit board, and when it is placed on a thick circuit board, the upper cover 21 is higher in the front and lower in the rear.

In a specific embodiment in which the lifting mechanism pushes the upper cover 21 to turn over, the upper cover 21 has a peripheral frame, and the frame is provided with a docking assembly 6 that cooperates with the lifting arm 32 of the lifting mechanism. The projection does not coincide with the bottom platform, as shown in Figure 10, so that when the upper cover 21 is fastened on the bottom platform, the bottom platform will not interfere with the docking assembly 6; It is roughly a U-shaped slot, and the slot width of the U-shaped slot is greater than or equal to the thickness of the lifting arm 32 . Referring to FIG. 5 , the support plate 31 is arranged in the area below the side of the bottom platform, the docking assembly 6 is arranged on the lower side of the frame of the upper cover 21 , and the lifting arm 32 is arranged on the side of the docking assembly 6 Below, when the first power mechanism 34 drives the lifting arm 32 to rotate upward, the lifting arm 32 pushes the docking assembly 6 . As mentioned above, if the lifting mechanism is provided on one side, the docking assembly 6 is provided on the corresponding side of the upper cover 21 , and if the lifting mechanism is provided on both sides, the docking assembly 6 is provided on the opposite sides of the upper cover 21 . In a further specific embodiment, the structure of each docking assembly 6 is shown in Figure 10:

Each docking assembly 6 includes two oppositely arranged limiting pieces 61 and a sliding shaft 62 arranged between the two limiting pieces 61, and there is a space for accommodating part of the lifting arm 32 between the two limiting pieces 61. When the first power mechanism 34 drives the elevating arm 32 to rotate upward, the elevating arm 32 is in contact with the sliding shaft 62. The sliding shaft 62 is preferably a smooth rod, or the sliding shaft 62 can roll freely. Free rolling means that the sliding shaft It is not fixed between the stoppers 61, but relative rotation can occur, so that after the lifting arm 32 contacts the sliding shaft 62, the continuous rotation of the lifting arm 32 can drive the sliding shaft 62 to rotate around the fixed central axis, and the rolling friction The form reduces the frictional force (relative to the sliding frictional force generated between the non-free rolling sliding shaft 62 and the lifting arm 32 ).

In one embodiment, as shown in Fig. 5 and Fig. 6, one end of the lifting arm 32 is rotatably connected to the supporting plate 31, and a hook structure 321 is provided on the other end thereof, and the hook structure 321 is used for The sliding shaft 62 plays a position-limiting role, so that even if the length of the lifting arm 32 is limited, it will not happen that the upper cover 21 is lifted at a certain angle and separated from the lifting arm 32; on the other hand, the lifting angle of the upper cover 21 can be limited to less than 90° , because if the hook structure is not provided to limit and the lifting arm 32 is long enough, the upper cover 21 will fall backward under the action of gravity after the lifting angle exceeds 90°.

In one embodiment of the present invention, a structure for absorbing circuit boards is provided on the bottom platform, as shown in Figures 5 and 8, at least one side of the glass layer 22 is provided with an inwardly recessed avoidance structure, and the bottom platform One or more suction nozzles 41 are arranged on the area corresponding to the avoidance structure, and the upper surface of the suction nozzle 41 is substantially flush with the upper surface of the glass layer 22. The upper plane is basically flush, but not limited to being absolutely flush. If ordinary observers cannot observe that one of the planes is obviously inclined relative to the other, the two planes are considered to be roughly flush, so that the circuit board to be tested is placed on the After the glass layer 22 is placed on the glass layer 22, the suction nozzle 41 is located below the edge of the circuit board. In one embodiment, the suction nozzle 41 is connected to an external vacuum generator through an air supply interface 44. It is not difficult to understand that the vacuum generator sucks the suction nozzle 41 and the circuit board. The air between the lower surfaces of the boards forms a vacuum between the two and fits them together. Its function is to prevent the suction force generated when the upper cover 21 is lifted or the airflow force generated when the upper cover 21 is lowered to cause the position of the PCB to drift. . As for the location and quantity of the suction nozzles 41 , and whether the suction nozzles share one air supply interface 44 , the present invention makes no limitation.

In one embodiment of the present invention, the bottom platform and the upper cover 21 are also provided with a locking mechanism, which is used to press and lock the upper cover 21 on the bottom platform after the circuit board is placed. There are at least three beneficial effects, one can To prevent the circuit board from shifting when the working platform moves to the detection position, the second is to ensure that the upper cover 21 is combined with the bottom platform (if the combination is not completed, the locking mechanism cannot complete the locking action), as a prerequisite for the next step, and the third is to ensure The flatness of the circuit board sandwiched between the upper cover 21 and the bottom platform, because this embodiment can be applied to a large circuit board (such as a circuit board with a length of 50cm-70cm and a width of 65cm-95cm), usually such a large-scale circuit board The flatness of the plate body itself is likely to be unable to be absolutely flat, and the gravity of the upper cover 21 alone cannot ensure its flatness, which may affect the detection accuracy. The specific structure of the locking mechanism is shown in Figure 5, Figure 10 and Figure 11. Each locking mechanism includes a second power mechanism, a lock tongue part 51 and a lock hole part 52. As can be seen from Figure 5, the lock tongue part 51 is arranged on the bottom platform 10, especially FIG. 11, it can be seen that when the upper cover 21 is fastened on the bottom platform, the lock tongue part 51 and the lock hole part 52 The holes are opposite, and under the drive of the second power mechanism, the lock tongue part 51 extends into the lock hole part 52 . It is very important that the locking tongue portion 51 stretches into the locking hole portion 52, and a resultant force will be formed between the upper cover 21 and the bottom platform to ensure the flatness of the large circuit board. Therefore, the locking tongue portion 51 needs to be aligned with the locking hole portion 52. On the other hand, in this embodiment, the very ingenious design is that, as shown in FIG. 11 , firstly, the lock hole portion 52 is not integrally formed with the upper cover, so that the height of the lock hole portion 52 can be adjusted to a level that can be offset against the lock tongue portion 51 The second is that the surface on the lock hole portion 52 that is against the bolt portion 51 is an inclined surface, and the inclined surface is inclined inwardly in the direction away from the bolt portion 51, that is, it has an inward retraction in the direction away from the bolt portion. Tightening trend, as shown in Figure 11, an upturned elastic piece is formed inside the lock hole part 52, and the locking mechanism is configured such that after the lock tongue part is inserted into the lock hole part, the lock tongue part and the lock tongue part are retracted inwardly. In other words, during the process of the lock tongue part 51 extending into the lock hole part 52, the state of the two is from approaching (but not in contact) to touching until reaching the state of being in contact with each other. In this embodiment, the lock tongue part The end of 51 is provided with a chamfered structure or a circular guide head structure, and the circular guide head structure can also be made of elastic materials such as rubber, which not only enhances the pressing force, but also prevents mechanical damage.

The number of the above locking mechanisms can be set in multiples, such as three. In this embodiment, the bottom platform is a rectangular structure, and a second power mechanism and a deadbolt 51 are respectively arranged at the four corners of the bottom platform. A lock hole portion 52 is provided. While triggering the travel switch 14 installed on the support plate 31, the locking mechanism will be unlocked, and the software will control the guide rod of the guide rod cylinder to stretch out to push the arc arm 33 to rotate and lift the lifting arm 32. When the sliding shaft 62 slides on the raised lifting arm 32, the upper cover 21 will open, and its flip angle can be controlled from 25° to 89°. The larger the flip angle, the more convenient the loading and unloading operation. The longer the cycle time, on the contrary, the shorter the cycle time for a single circuit board to complete the detection, but the more inconvenient the operation of loading and unloading, the flip angle can be controlled at 50±5°.

The PCB through-hole detection device of the present invention is not only suitable for large-scale circuit boards, but also for small-scale circuit boards. Regardless of the size of the circuit boards, there is a reference placement position on the bottom platform, such as in a circuit board of the present invention. In the embodiment, the reference placement position is the lower right corner of the bottom platform, correspondingly, one or more floating PIN seats are set on the right edge of the bottom platform, and one or more floating PIN seats are set on the lower edge of the bottom platform, As shown in Figure 7, each floating PIN seat includes a Pin column 42 and an elastic member 43 arranged below the Pin column 42. When the elastic member 43 is in a natural state, the height of the upper surface of the Pin column 42 is high. At the height of the upper surface of the bottom platform, that is, when the upper cover 21 is not pressed on the base platform, the elastic member 43 is not under pressure. At this time, the Pin column 42 protrudes from the plane where the glass layer 22 is located, so that the rectangular circuit The lower side and the right side of the board are respectively against the Pin column 42 on the lower side and the Pin column 42 on the right side to provide positioning for placing the PCB board, that is, to complete the positioning and discharging (circuit board) of the reference placement position; when the upper cover 21 is fastened When on the bottom platform, the upper cover 21 presses against the Pin column 42 so that the elastic member 43 is in a compressed state, and the sinking Pin column will not affect the combination of the upper cover 21 and the bottom platform.

The invention relates to a new type of separated lifting and clamping working platform device, which is mainly used in AOI through-hole detection equipment for detecting PCB through-hole plates. The clamping working platform ensures the flatness of the circuit board in it, and the lifting mechanism is fixed. It is set at the loading position of the equipment. When the working platform moves to the loading position, the lifting mechanism can be triggered automatically or manually through the control button to drive the upper cover to rotate so that it forms a certain angle with the bottom platform, so that it is convenient for manual or robot automatic operation. For loading and unloading, the lifting mechanism is separated from the main body of the working platform, which greatly increases the accuracy and stability of the working platform, reduces the weight of the moving platform, increases the speed of the platform to a certain extent, and improves the detection efficiency of the equipment.

Compared with the platform design in which the working platform moves with the lifting mechanism, the effect of the present invention is obvious. The mechanical structure design of the platform moving with the lifting mechanism is relatively complicated, and the heavy mechanism increases the burden on the driving mechanism. The motion accuracy is not good, which affects the overall accuracy and detection ability of the equipment; and the opening and closing angle of the platform carrying the lifting mechanism must be limited by the mechanism, resulting in the limited opening and closing angle and affecting the convenience of operation.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above description is only the specific implementation of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, some improvements and modifications can also be made. It should be regarded as the protection scope of this application.

1: Abutment 11: slide rail 21: Upper cover 22: Glass layer 23: Dodging layer 24: Backlight board 31: support plate 32: Lifting arm 321: hook structure 33: arc arm 34: The first power mechanism 35: travel switch 41: Nozzle 42:Pin column 43: Elastic parts 44: Air supply interface 51:Lock tongue 52: Keyhole 6: Docking components 61: limit piece 62: sliding shaft 7: Floating flip axis 8: Optical detection device

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings that need to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are only the present invention For some embodiments described in the application, those skilled in the art can also obtain other drawings based on these drawings without creative work. FIG. 1 is a schematic structural diagram of a PCB through-hole detection device provided by an exemplary embodiment of the present disclosure; Fig. 2 is a schematic side view of the PCB through-hole detection device shown in Fig. 1; FIG. 3 is a partially enlarged schematic diagram of the PCB through-hole detection equipment shown in FIG. 2; FIG. 4 is a schematic diagram of a partial structure of the PCB through-hole detection device shown in FIG. 1; Fig. 5 is a structural schematic diagram of the working platform and the lifting mechanism of the PCB through-hole detection equipment shown in Fig. 4; Fig. 6 is a structural schematic view of another viewing angle of the lifting mechanism shown in Fig. 5; Figure 7 is an enlarged partial cross-sectional view of parts on the working platform shown in Figure 5; Fig. 8 is a three-dimensional schematic view of the components shown in Fig. 7 from another perspective; Fig. 9 is a schematic diagram of the internal structure of the working platform shown in Fig. 5; Fig. 10 is a schematic diagram of the overall structure of the working platform shown in Fig. 5 when the upper cover is closed; Fig. 11 is a partially enlarged schematic diagram of the working platform shown in Fig. 10 at the opening and closing shaft.

1: Abutment

11: slide rail

21: Upper cover

22: Glass layer

31: support plate

32: Lifting arm

33: arc arm

41: Nozzle

42:Pin column

51:Lock tongue

52: Keyhole

6: Docking components

Claims (11)

A PCB through-hole detection device, used for through-hole detection on a circuit board, the circuit board to be detected is provided with a through-hole, and the content of the through-hole detection is to detect whether the through-hole meets a preset condition, wherein, The PCB through-hole detection equipment includes: The abutment is provided with a feeding position and a detection position; an optical detection device, which is erected above the detection position of the abutment; The working platform includes a bottom platform and an upper cover, the working platform is slidably arranged on the slide rail of the base platform, the upper cover is made of transparent material, and the upper cover is pivotally connected to the bottom platform; A lifting mechanism, which includes a support plate, a first power mechanism, and a lifting arm, wherein the support plate is fixed on the base, and driven by the first power mechanism, the lifting arm moves relative to the support plate turn; The working platform is configured to be able to move between the loading position and the detecting position along the slide rail, and the frame of the upper cover is provided with a docking assembly that cooperates with the lifting arm. When the working platform When it is at the loading position and the first power mechanism drives the lifting arm to rotate upward, the lifting arm drives the docking assembly so that the upper cover turns upward relative to the bottom platform. The PCB through-hole detection device according to claim 1, wherein the detection position is set at the rear of the abutment table, and the loading position is set at the front of the abutment table; The pivot shaft between the upper cover and the bottom platform is arranged at the rear or left or right part of the upper cover. According to the PCB through-hole detection device described in claim 1, wherein the projection of the docking component on the plane where the bottom platform is located does not overlap with the bottom platform; When the first power mechanism drives the lifting arm to rotate upward, the lifting arm pushes or pulls the docking assembly. According to the PCB through-hole detection device described in claim 3, wherein the docking assembly is arranged on one side of the upper cover, or the two opposite sides of the upper cover are provided with the docking assembly; Each docking assembly includes two oppositely arranged limiting pieces and a sliding shaft arranged between the two limiting pieces, and there is a space for accommodating part of the lifting arm between the two limiting pieces, and the first power mechanism When the lifting arm is driven to rotate upward, the lifting arm is in contact with the sliding shaft. According to the PCB through-hole inspection device described in claim 3 or 4, one end of the lifting arm is rotatably connected to the support plate, and a hook structure is provided on the other end. According to the PCB through-hole detection device described in claim 1, wherein the bottom platform includes a glass layer and a dodging layer and a backlight board arranged under the glass layer, wherein the backlight board is arranged on the Below the dodging layer; At least one side of the glass layer is provided with an inwardly recessed avoidance structure, and one or more suction nozzles are provided on the bottom platform corresponding to the avoidance structure, and the upper surface of the suction nozzle is in contact with the glass layer. The upper surface of the layer is flush. According to the PCB through-hole detection device described in claim 1, it also includes more than two locking mechanisms, and each locking mechanism includes a second power mechanism, a lock tongue part and a lock hole part, wherein the second power mechanism and the lock The tongue is arranged on the bottom platform, and the keyhole is arranged on the upper cover; When the upper cover is fastened on the bottom platform, the lock tongue part is opposite to the opening of the lock hole part, and the second power mechanism is configured to drive the lock tongue part to extend into the lock hole department. According to the PCB through-hole detection device according to claim 7, wherein the lock hole part includes at least one surface that has a tendency to tighten inward in the direction away from the lock tongue part, and the locking mechanism is configured to After the locking tongue part extends into the locking hole, the locking tongue part abuts against the surface with a tendency to tighten inward. According to the PCB through-hole detection device described in claim 1, wherein the bottom platform is a rectangular structure, floating PIN seats are provided on adjacent sides of the bottom platform, and the floating PIN seats include Pin columns and are arranged on the bottom platform. The elastic member below the Pin column, when the elastic member is in a natural state, the height of the upper surface of the Pin column is higher than the height of the upper surface of the bottom platform; When the upper cover is buckled on the bottom platform, the upper cover presses against the Pin post so that the elastic member is in a compressed state. According to the PCB through-hole inspection device described in Claim 1, wherein the pivotal connection part between the upper cover and the bottom platform is a floating flip shaft. According to the PCB through hole detection equipment described in claim 3, wherein the first power mechanism is a guide rod cylinder, one end of which is fixed on the front lower surface of the support plate, and the other end extends backward; the lifting arm The front end of the front end is pivotally arranged above the support plate, and its rear end extends backward; the support plate is provided with a perforation, and the other end of the guide rod type cylinder passes through the arc arm passing through the perforation and the lifting arm. middle connection; The support plate is arranged in the area below the side of the bottom platform, the docking assembly is arranged on the lower side of the frame of the upper cover, the lifting arm is arranged below the docking assembly, and the first power mechanism When the lifting arm is driven to rotate upwards, the lifting arm pushes the docking assembly.