An automatic cleaning mechanism

Abstract

The utility model relates to circuit board processing technical field discloses a kind of automatic cleaning mechanism with good cleaning effect, high cleaning efficiency and low operating cost, including XYZ three-axis drive mechanism, brush and brush driving part, XYZ three-axis drive mechanism includes X-axis sliding rail, Y-axis sliding rail being slidably installed on X-axis sliding rail, X-axis driving part being installed on X-axis sliding rail and driving Y-axis sliding rail in horizontal plane along first direction sliding, Z-axis sliding rail being slidably installed on Y-axis sliding rail, Y-axis driving part being installed on Y-axis sliding rail and driving Z-axis sliding rail in horizontal plane along second direction sliding, mounting support being slidably installed on Z-axis sliding rail, Z-axis driving part being installed on Z-axis sliding rail and driving mounting support in vertical plane lifting;First direction is perpendicular to second direction;Brush is rotatably installed at mounting support top, and the central shaft of brush rotation is perpendicular to vertical plane;Brush driving part is fixed on mounting support and drives brush rotation.

Description

Technical Field

[0001] This utility model relates to the field of circuit board processing technology, and in particular to an automatic cleaning mechanism. Background Technology

[0002] In the PCBA (Printed Circuit Board Assembly) manufacturing process, soldering is performed on corresponding positions on the board according to the specific circuit structure to form solder joints and achieve electrical connections between various components in the circuit. During soldering, flux is applied to the board surface to reduce soldering difficulty and improve the stability of the solder joints. After soldering, the PCBA board needs to be cleaned to remove residual flux. Currently, the industry mainly uses manual hand-held brushes to clean the residual flux from the surface of the PCBA board after soldering. This cleaning method is highly dependent on the operator's skill level and condition, resulting in some areas of the PCBA board not being cleaned, leading to insufficient cleanliness after cleaning. Furthermore, in mass production of PCBA boards, manual cleaning is inefficient and costly, increasing production costs and impacting product output. Utility Model Content

[0003] Therefore, it is necessary to provide an automatic cleaning mechanism that has good cleaning effect, high cleaning efficiency and low operating cost to address the above-mentioned shortcomings.

[0004] An automatic cleaning mechanism is provided for placement beneath a PCBA transport track, the automatic cleaning mechanism comprising: The XYZ three-axis drive mechanism includes an X-axis slide rail arranged in a horizontal plane, a Y-axis slide rail slidably mounted on the X-axis slide rail, an X-axis drive component mounted on the X-axis slide rail and driving the Y-axis slide rail to slide in a first direction in the horizontal plane, a Z-axis slide rail slidably mounted on the Y-axis slide rail, a Y-axis drive component mounted on the Y-axis slide rail and driving the Z-axis slide rail to slide in a second direction in the horizontal plane, a mounting bracket slidably mounted on the Z-axis slide rail, and a Z-axis drive component mounted on the Z-axis slide rail and driving the mounting bracket to move up and down in a vertical plane; the first direction is perpendicular to the second direction. A brush, wherein the brush is rotatably mounted on the top of the mounting bracket, and the central axis of rotation of the brush is perpendicular to the vertical plane; A brush drive unit is fixed on the mounting bracket and drives the brush to rotate.

[0005] In one embodiment, the automatic cleaning mechanism further includes a base frame, the X-axis slide rail is fixed to one side of the top of the base frame, and a guide rail extending in a first direction is fixed to the other side of the top of the base frame. The bottom of one end of the Y-axis slide rail is slidably engaged with the X-axis slide rail via a first slider, and the bottom of the other end of the Y-axis slide rail is slidably engaged with the guide rail via a second slider.

[0006] In one embodiment, the automatic cleaning mechanism further includes two sets of sliding limit members disposed opposite to each other below the bottom frame. Each set of sliding limit members includes at least one limit block. The upper surface of the limit block is provided with a limit groove. The bottom of the bottom frame is fixed with two limit strips corresponding to the two sets of sliding limit members. The limit strips are embedded in the limit grooves and can slide relative to the limit blocks in the horizontal plane. The cross-sectional shape of the limit strips is adapted to the cross-sectional shape of the limit grooves.

[0007] In one embodiment, a pull-out handle is fixed to one side of the lower part of the bottom frame, and two oppositely arranged extension arms are fixed to the side of the lower part of the bottom frame facing away from the pull-out handle. The two extension arms correspond one-to-one with two limiting strips, and the limiting strips extend from the end of the lower surface of the bottom frame adjacent to the pull-out handle to the end of the lower surface of the extension arm away from the pull-out handle.

[0008] In one embodiment, the X-axis drive includes a first motor fixed on an X-axis slide rail, a first lead screw that is driven and connected to the output shaft of the first motor and extends along a first direction, a first slider sleeved on the first lead screw and limited to the X-axis slide rail in a vertical direction, and the first slider and the first lead screw are threaded together.

[0009] In one embodiment, the Y-axis drive includes a second motor fixed to one end of the Y-axis slide rail, a second lead screw driven and connected to the output shaft of the second motor and extending along a second direction, and a third slider sleeved on the second lead screw and limited to the Y-axis slide rail in a vertical direction. The third slider is threadedly engaged with the second lead screw and is fixedly connected to one side of the Z-axis slide rail.

[0010] In one embodiment, the upper part of the third slider is fixed with a triangular reinforcing plate that is fixedly connected to the Z-axis slide rail.

[0011] In one embodiment, the Z-axis drive includes a third motor fixed to the bottom end of the Z-axis slide rail, a third lead screw that is driven and connected to the output shaft of the third motor and extends upward in the vertical direction, and a fourth slider that is sleeved on the third lead screw and limited to the Z-axis slide rail in the horizontal direction. The fourth slider is threadedly engaged with the third lead screw and is fixedly connected to the mounting bracket.

[0012] In one embodiment, the mounting bracket includes a horizontal part fixedly connected to a fourth slider, a vertical part fixed to the upper part of the horizontal part and extending vertically upward, the brush being rotatably mounted on the top of the vertical part via a rotating shaft, and the brush being detachably connected to the rotating shaft. The brush drive is a fourth motor that is driven and coaxially rotated with the rotating shaft; or the brush drive includes a fifth motor fixed on the horizontal part, a driving belt gear rotatably mounted on the horizontal part and driven and connected to the output shaft of the fifth motor, a driven belt gear rotatably mounted on the top of the vertical part and driven and connected to the rotating shaft, and a gear belt arranged vertically and straddling the driving belt gear and the driven belt gear.

[0013] In one embodiment, at least one position sensor is provided on each of the X-axis slide rail, the Y-axis slide rail, and the Z-axis slide rail; a CCD camera is mounted on the X-axis slide rail, the Y-axis slide rail, or the Z-axis slide rail, and the detection area of ​​the CCD camera is located above the brush.

[0014] The automatic cleaning mechanism of this invention adjusts the position of the brush in three-dimensional space through an XYZ three-axis drive mechanism, and drives the brush to rotate in a vertical plane through a brush drive component. When the PCBA board moves above the brush on the PCBA transport track, the brush moves under the drive of the XYZ three-axis drive mechanism to abut against the lower surface of the PCBA board. The rotating brush removes residual flux from the surface of the PCBA board. By cleaning from below the PCBA board, the cleaning liquid can drip off under gravity, avoiding the residue of cleaning liquid on the brush on the PCBA board. It replaces manual cleaning, improving the cleaning efficiency of PCBA board and reducing labor costs. At the same time, the XYZ three-axis drive mechanism precisely controls the position of the brush, performing comprehensive cleaning of all parts of the PCBA board and improving the cleaning effect of the PCBA board. Attached Figure Description

[0015] Figure 1 This is a first-view structural schematic diagram of the automatic cleaning mechanism in one embodiment of the present invention; Figure 2 This is a second-view structural schematic diagram of the automatic cleaning mechanism in one embodiment of the present invention; Figure 3 This is a third-view structural schematic diagram of the automatic cleaning mechanism in one embodiment of the present invention. Detailed Implementation

[0016] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0017] This utility model discloses an automatic cleaning mechanism with good cleaning effect, high cleaning efficiency, and low operating cost. The automatic cleaning mechanism is arranged below the PCBA transport track. After the PCBA boards are soldered, they are transported along the PCBA transport track with the tooling. When the PCBA boards are transported above the automatic cleaning mechanism, the tooling and PCBA are positioned so that the bottom of the PCBA boards can be cleaned by the automatic cleaning mechanism. Please refer to [link to relevant documentation]. Figure 1The automatic cleaning mechanism of this embodiment includes an XYZ three-axis drive mechanism 100, a brush 200, and a brush drive component 300. The XYZ three-axis drive mechanism 100 includes an X-axis slide rail 110 arranged in a horizontal plane, a Y-axis slide rail 120 slidably mounted on the X-axis slide rail 110, an X-axis drive component 130 mounted on the X-axis slide rail 110 and driving the Y-axis slide rail 120 to slide in a first direction in the horizontal plane, a Z-axis slide rail 140 slidably mounted on the Y-axis slide rail 120, a Y-axis drive component 150 mounted on the Y-axis slide rail 120 and driving the Z-axis slide rail 140 to slide in a second direction in the horizontal plane, a mounting bracket 160 slidably mounted on the Z-axis slide rail 140, and a Z-axis drive component 170 mounted on the Z-axis slide rail 140 and driving the mounting bracket 160 to move up and down in a vertical plane; the first direction is perpendicular to the second direction. Thus, through the combined action of the X-axis drive 130 and the Y-axis drive 150, the position of the brush 200 in the horizontal plane can be adjusted, and through the Z-axis drive 170, the position of the brush 200 in the vertical direction can be adjusted. The XYZ three-axis drive mechanism 100 is used to realize the positional movement of the brush 200 in three-dimensional space, so that the brush 200 can move to a preset position under the PCBA board, and move closer to it to abut against or move away from the lower surface of the PCBA board, thereby ensuring that the brush 200 can contact all positions on the lower surface of the PCBA board, achieving comprehensive cleaning of the PCBA board. The brush 200 is rotatably mounted on the top of the mounting bracket 160, and the central axis of rotation of the brush 200 is perpendicular to the vertical plane, so that the brush 200 can continuously rub the lower surface of the PCBA board during rotation. The brush drive 300 is fixed on the mounting bracket 160 and drives the brush 200 to rotate. In this embodiment, the brush drive 300 drives the brush 200 to rotate in a vertical plane, so that the brush 200 contacts the lower surface of the PCBA board during rotation and wipes away the flux on the lower surface of the PCBA board. It should be noted that in this embodiment, when cleaning the PCBA board, the brush 200 needs to be pre-sprayed with an organic solution (cleaning liquid) to clean the residual flux on the PCBA board, thereby improving cleaning efficiency and effectiveness.

[0018] Please combine Figure 1-3The X-axis drive component 130 includes a first motor 131 fixed on the X-axis slide rail 110, a first lead screw 132 drivenly connected to the output shaft of the first motor 131 and extending along a first direction, a first slider sleeved on the first lead screw 132 and limitedly engaged with the X-axis slide rail 110 in the vertical direction, and a first slider 133 fixed on the lower surface of the Y-axis slide rail 120, and the first slider 133 threadedly engaged with the first lead screw 132. In this embodiment, the X-axis slide rail 110 is provided with a first slide groove 111 extending in a first direction. Each of the two opposite inner sides of the first slide groove 111 is provided with a first limiting groove extending in the first direction. The two sides of the first slider 133 are slidably engaged with the two opposite inner sides of the first slide groove 111. The first slider 133 is provided with two first pins that are slidably inserted into the two first limiting grooves. In this way, while limiting the sliding path of the first slider 133 by the first slide groove 111, the first slider 133 can be prevented from falling off the X-axis slide rail 110 in the vertical direction. The first slider 133 is provided with a threaded hole for the first lead screw 132 to pass through. In this way, during the operation of the first motor 131, the output shaft of the first motor 131 drives the first lead screw 132 to rotate. Through the limiting effect of the first limiting groove on the first slider 133 and the threaded connection between the first slider 133 and the first lead screw 132, the first slider 133 can move along the length direction (i.e., the first direction) of the first lead screw 132, so as to realize the position adjustment of the brush 200 along the first direction. In this embodiment, the first motor 131 is a servo motor. The output shaft of the first motor 131 can be coaxial with the first lead screw 132, and the two are connected by a coupling; or the axial direction of the output shaft of the first motor 131 can be perpendicular to the axial direction of the first lead screw 132, and the two can be driven by a transmission belt (i.e., a combination structure of transmission belt and driving pulley and driven pulley), or by a gear set including a pair of bevel gears. In addition, a first support plate 112 is fixed above the X-axis slide rail 110. The first support plate 112 and the X-axis slide rail 110 form a space for accommodating the first lead screw 132. The first slider 133 has a channel for the first support plate 112 to pass through. In this way, by setting the first support plate 112, the mechanical strength of the X-axis slide rail 110 is improved. On the other hand, the sliding cooperation between the first slider 133 and the first support plate 112 can realize the secondary limiting of the first slider 133, so as to reduce the shaking of the first slider 133 and improve the stability of the brush 200 moving along the first direction.

[0019] The Y-axis drive unit 150 includes a second motor 151 fixed to one end of the Y-axis slide rail 120, a second lead screw 152 drivenly connected to the output shaft of the second motor 151 and extending along the second direction, and a third slider 153 sleeved on the second lead screw 152 and limitedly engaged with the Y-axis slide rail 120 in the vertical direction. The third slider 153 is threadedly engaged with the second lead screw 152, and the third slider 153 is fixedly connected to one side of the Z-axis slide rail 140. In this embodiment, a second slide groove 121 extending in the second direction is provided on the Y-axis slide rail 120. Each of the two opposite inner sides of the second slide groove 121 is provided with a second limiting groove extending in the second direction. The two sides of the third slider 153 are slidably engaged with the two opposite inner sides of the second slide groove 121. The third slider 153 is provided with two second pins that are slidably inserted into the two second limiting grooves. In this way, while limiting the sliding path of the third slider 153 by the second slide groove 121, the third slider 153 can be prevented from falling off the Y-axis slide rail 120 in the vertical direction. The third slider 153 is provided with a threaded hole for the second lead screw 152 to pass through. In this way, during the operation of the second motor 151, the output shaft of the second motor 151 drives the second lead screw 152 to rotate. Through the limiting effect of the second limiting groove on the third slider 153 and the threaded connection between the third slider 153 and the second lead screw 152, the third slider 153 can move along the length direction (i.e., the second direction) of the second lead screw 152, so as to realize the position adjustment of the brush 200 along the second direction. In this embodiment, the second motor 151 is a servo motor. The output shaft of the second motor 151 can be coaxial with the second lead screw 152, and the two are connected by a coupling; or the axial direction of the output shaft of the second motor 151 can be perpendicular to the axial direction of the second lead screw 152, and the two can be driven by a transmission belt (i.e., a combination structure of transmission belt and driving pulley and driven pulley), or by a gear set including a pair of bevel gears. In addition, a second support plate 122 is fixed above the Y-axis slide rail 120. The second support plate 122 and the Y-axis slide rail 120 form a space for accommodating the second lead screw 152. The third slider 153 has a channel for the second support plate 122 to pass through. In this way, by setting the second support plate 122, the mechanical strength of the Y-axis slide rail 120 is improved. On the other hand, the sliding cooperation between the third slider 153 and the second support plate 122 can realize the secondary limiting of the third slider 153, so as to reduce the shaking of the third slider 153 and improve the stability of the brush 200 moving along the second direction.

[0020] Furthermore, in this embodiment, a triangular reinforcing plate 154 is fixedly connected to the upper part of the third slider 153 and to the Z-axis slide rail 140. The triangular reinforcing plate 154 has a right-angled triangular plate structure, with one right-angled side fixedly connected to the top of the third slider 153 and the other right-angled side fixedly connected to the side of the Z-axis slide rail 140. This improves the stability of the third slider 153 structure and avoids the problem of breakage at the connection between the Z-axis slide rail 140 and the third slider 153 due to excessive force on the third slider 153, thereby improving the stability and reliability of the entire automatic cleaning mechanism structure.

[0021] Z-axis drive unit 170 includes a third motor 171 fixed to the bottom end of Z-axis slide rail 140, a third lead screw 172 driven by the output shaft of the third motor 171 and extending upward in the vertical direction, and a fourth slider 173 sleeved on the third lead screw 172 and limited to the Z-axis slide rail 140 in the horizontal direction. The fourth slider 173 is threadedly engaged with the third lead screw 172, and the fourth slider 173 is fixedly connected to the mounting bracket 160. In this embodiment, a third groove 141 extending vertically is provided on the Z-axis slide rail 140. Each of the two opposite inner sides of the third groove 141 is provided with a third limiting groove extending vertically. The two sides of the fourth slider 173 are slidably engaged with the two opposite inner sides of the third groove 141. The fourth slider 173 is provided with two third pins that are slidably inserted into the two third limiting grooves. In this way, while limiting the sliding path of the fourth slider 173 by the third groove 141, the fourth slider 173 can be prevented from falling off the Z-axis slide rail 140 in the horizontal direction. The fourth slider 173 is provided with a threaded hole for the third lead screw 172 to pass through. In this way, during the operation of the third motor 171, the output shaft of the third motor 171 drives the third lead screw 172 to rotate. Through the limiting effect of the third limiting groove on the fourth slider 173 and the threaded connection between the fourth slider 173 and the third lead screw 172, the fourth slider 173 can move along the length direction (i.e., the vertical direction) of the third lead screw 172, thereby realizing the vertical position adjustment of the brush 200. In this embodiment, the third motor 171 is a servo motor. The output shaft of the third motor 171 can be coaxial with the third lead screw 172, and the two can be connected by a coupling; alternatively, the axial direction of the output shaft of the third motor 171 can be perpendicular to the axial direction of the third lead screw 172, and the two can be driven by a transmission belt (i.e., a combination structure of a transmission belt, a driving pulley, and a driven pulley), or by a gear set including a pair of bevel gears. In addition, a third support plate 142 is fixed to the side of the Z-axis slide rail 140. The third support plate 142 and the Z-axis slide rail 140 form a space for accommodating the third lead screw 172. The fourth slider 173 has a channel for the third support plate 142 to pass through. In this way, by setting the third support plate 142, the mechanical strength of the Z-axis slide rail 140 is improved. On the other hand, the sliding cooperation between the fourth slider 173 and the third support plate 142 can realize the secondary limiting of the fourth slider 173, so as to reduce the shaking of the fourth slider 173 and improve the stability of the brush 200 moving in the vertical direction.

[0022] The mounting bracket 160 includes a horizontal portion 161 fixedly connected to the fourth slider 173, and a vertical portion 162 fixed to the upper part of the horizontal portion 161 and extending vertically upward. The brush 200 is rotatably mounted on the top of the vertical portion 162 via a rotating shaft 210, and the brush 200 is detachably connected to the rotating shaft 210. In this embodiment, the mounting bracket 160 has an L-shaped structure, with the vertical portion 162 and the brush drive 300 located on one side of the horizontal portion 161, and the Z-axis slide rail 140 and the third motor 171 located on the other side of the horizontal portion 161. The brush drive 300 is a fourth motor that is driven and coaxially rotated with the rotating shaft 210; or the brush drive 300 includes a fifth motor 310 fixed on the horizontal part 161, a driving belt gear 320 rotatably mounted on the horizontal part 161 and driven and connected to the output shaft of the fifth motor 310, a driven belt gear 330 rotatably mounted on the top of the vertical part 162 and driven and connected to the rotating shaft 210, and a gear belt 340 arranged vertically and straddling the driving belt gear 320 and the driven belt gear 330. In this embodiment, when the brush drive 300 is a fourth motor that is driven and coaxially rotated with the rotating shaft 210, the fourth motor is mounted on the top of the vertical part 162, and a bearing is provided at the mating part between the rotating shaft 210 and the vertical part 162 to ensure the smooth rotation of the rotating shaft 210 and avoid the impact on the PCBA board caused by the shaking of the brush 200. When the brush drive unit 300 includes a fifth motor 310 and a belt drive structure, the fifth motor 310 is installed at the bottom end of the vertical part 162. Similarly, a bearing is provided at the mating part between the rotating shaft 210 and the vertical part 162. Preferably, in this embodiment, the brush drive unit 300 is composed of a fifth motor 310 and a belt drive structure. Thus, by installing the fifth motor 310 at the bottom end of the vertical part 162, the center of gravity of the XYZ three-axis drive mechanism 100 can be lowered to avoid the shaking problem caused by the XYZ three-axis drive mechanism 100 being too high, thereby improving the stability of the automatic cleaning mechanism structure. In this embodiment, the brush 200 is fixed to the rotating shaft 210 by a locking pin. The locking pin is inserted into the end of the rotating shaft 210 and abuts against the side of the brush 200 facing away from the Z mounting bracket 160. Thus, when the brush 200 is damaged, the brush 200 can be quickly removed from the rotating shaft 210 to replace it with a new brush 200.

[0023] In one embodiment, the automatic cleaning mechanism further includes a base frame 400. An X-axis slide rail 110 is fixed to one side of the top of the base frame 400, and a guide rail 410 extending in a first direction is fixed to the other side of the top of the base frame 400. The bottom of one end of the Y-axis slide rail 120 is slidably engaged with the X-axis slide rail 110 via a first slider 133, and the bottom of the other end of the Y-axis slide rail 120 is slidably engaged with the guide rail 410 via a second slider 420. In this embodiment, the base frame 400 is a cuboid frame structure formed by welding or screwing together multiple square tubes or angle steels. The top surface of the base frame 400 is open to provide clearance space for the third motor 171 located at the bottom of the mounting bracket 160. All four sides of the base frame 400 are open, and a storage box 430 is provided at the bottom of the base frame 400. The storage box 430 is used to collect waste liquid or impurities dripping from the brush 200 during the cleaning of the lower surface of the PCBA board, thereby collecting the cleaning waste liquid or impurities. By setting a guide rail 410 and a second slider on the side of the bottom frame 400 opposite to the first slider 133, the Y-axis slide rail 120 is supported, so as to avoid the problem of the Y-axis slide rail 120 shaking due to uneven force on the Y-axis slide rail 120, thereby improving the smoothness of the sliding of the Y-axis slide rail 120 and the reliability of the movement of the brush 200.

[0024] Furthermore, the automatic cleaning mechanism also includes two sets of sliding limiting members arranged opposite each other below the bottom frame 400. Each set of sliding limiting members includes at least one limiting block 500. The upper surface of the limiting block 500 is provided with a limiting groove 510. The bottom of the bottom frame 400 is fixed with two limiting strips 440 corresponding to the two sets of sliding limiting members. The limiting strips 440 are embedded in the limiting grooves 510 and can slide relative to the limiting blocks 500 in the horizontal plane. The cross-sectional shape of the limiting strips 440 is adapted to the cross-sectional shape of the limiting grooves 510. In this embodiment, each set of sliding limiting members includes two limiting blocks 500 arranged at intervals along the length direction of the limiting grooves 510. The limiting blocks 500 are fixed to the factory floor or external frame by screws, or they can be fixed to the external frame by welding. By setting a limiting block 500 below the bottom frame 400 and a limiting strip 440 at the bottom of the bottom frame 400, the automatic cleaning mechanism can be slidably set. In this way, the automatic cleaning mechanism can be pulled out along the limiting groove 510 by pulling the bottom frame 400, so as to maintain the automatic cleaning mechanism. This solves the problem of small internal space of the equipment and inconvenience for personnel to crawl in from the bottom, thereby reducing the maintenance difficulty of the automatic cleaning mechanism.

[0025] In this embodiment, a pull-out handle 450 is fixed to one side of the lower part of the base frame 400. Two opposing extension arms 460 are fixed to the lower part of the base frame 400 opposite to the pull-out handle 450. The two extension arms 460 correspond one-to-one with two limiting strips 440, and the limiting strips 440 extend from one end of the lower surface of the base frame 400 adjacent to the pull-out handle 450 to the end of the lower surface of the extension arm 460 away from the pull-out handle 450. Preferably, the pull-out handle 450 is fixed to the side of the storage box 430 by screws, or the pull-out handle 450 is welded to the side of the storage box 430. The pull-out handle 450 is used to provide a gripping part so that the operator can take out the automatic cleaning mechanism from under the PCBA transport track by gripping the pull-out handle 450. Furthermore, by providing an extension arm 460 at the lower part of the base frame 400, the sliding range of the base frame 400 relative to the limiting block 500 is extended. This allows the automatic cleaning mechanism to be pulled out to a position far from the PCBA transport track under external force, ensuring sufficient space beside the PCBA transport track for maintenance of the automatic cleaning mechanism and preventing the PCBA transport track from interfering with maintenance operations. In this embodiment, a limiting clip 470 is provided at the lower part of the extension arm 460 away from the pull handle 450. This limiting clip 470 abuts against the end of the limiting block 500 facing away from the pull handle 450, limiting the maximum distance the base frame 400 can be pulled, thus preventing the base frame 400 from detaching from the limiting block 500.

[0026] It should be noted that the automatic cleaning mechanism in this embodiment also includes a main controller, which is a PLC controller or microcontroller electrically connected to the first motor 131, the second motor 151, the third motor 171, and the fourth motor (or the fifth motor 310). The main controller is used to control the operation of the entire automatic cleaning mechanism. By controlling the operation of the first motor 131, the second motor 151, and the third motor 171 (such as controlling the rotation or stopping of the above motors, and controlling the speed, rotation cycle, and rotation interval of the above motors), the brush 200 can be moved to all positions on the underside of the PCBA board, thereby achieving comprehensive cleaning of the underside of the PCBA board. In addition, in this embodiment, at least one position sensor 600 is provided on the X-axis slide rail 110, the Y-axis slide rail 120, and the Z-axis slide rail 140. For example, multiple position sensors 600 are spaced apart along the first direction on the X-axis slide rail 110, multiple position sensors 600 are spaced apart along the second direction on the Y-axis slide rail 120, and multiple position sensors 600 are spaced apart along the vertical direction on the Z-axis slide rail 140. The position sensors 600 can be optical sensors or contact sensors, and each of the position sensors 600 is electrically connected to the main controller. In this way, when the main controller receives the electrical signal sent by the corresponding position sensor 600, it controls the motor corresponding to the position sensor 600 to stop rotating so as to clean the specific part on the PCBA board, or to determine the position of the brush 200 by receiving the electrical signal sent by the corresponding position sensor 600 in order to evaluate the progress of the cleaning operation. In this embodiment, a CCD camera is installed on the X-axis slide rail 110, Y-axis slide rail 120, or Z-axis slide rail 140. The detection area of ​​the CCD camera is located above the brush 200. The CCD camera can be electrically connected to the main controller or to an external processing device. In this way, after the brush 200 cleans the PCBA board, the image of the lower surface of the PCBA board can be captured by the CCD camera to detect abnormal solder joints on the PCBA board in a timely manner and rework the product in a timely manner.

[0027] The automatic cleaning mechanism of this invention adjusts the position of the brush 200 in three-dimensional space through the XYZ three-axis drive mechanism 100, and drives the brush 200 to rotate in the vertical plane through the brush drive component 300. When the PCBA board moves on the PCBA transport track above the brush 200, the brush 200 moves under the drive of the XYZ three-axis drive mechanism 100 to abut against the lower surface of the PCBA board. The rotating brush 200 removes residual flux from the surface of the PCBA board. By cleaning from below the PCBA board, the cleaning liquid can drip off under its gravity, avoiding the residue of cleaning liquid on the brush 200 on the PCBA board. It replaces manual cleaning, improving the cleaning efficiency of PCBA board and reducing labor costs. At the same time, the XYZ three-axis drive mechanism 100 precisely controls the position of the brush 200 to perform comprehensive cleaning of all parts of the PCBA board, improving the cleaning effect of the PCBA board.

[0028] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0029] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An automatic cleaning mechanism, characterized in that, The automatic cleaning mechanism, designed to be positioned below the PCBA transport track, includes: The XYZ three-axis drive mechanism includes an X-axis slide rail arranged in a horizontal plane, a Y-axis slide rail slidably mounted on the X-axis slide rail, an X-axis drive component mounted on the X-axis slide rail and driving the Y-axis slide rail to slide in a first direction in the horizontal plane, a Z-axis slide rail slidably mounted on the Y-axis slide rail, a Y-axis drive component mounted on the Y-axis slide rail and driving the Z-axis slide rail to slide in a second direction in the horizontal plane, a mounting bracket slidably mounted on the Z-axis slide rail, and a Z-axis drive component mounted on the Z-axis slide rail and driving the mounting bracket to move up and down in a vertical plane; the first direction is perpendicular to the second direction. A brush, wherein the brush is rotatably mounted on the top of the mounting bracket, and the central axis of rotation of the brush is perpendicular to the vertical plane; A brush drive unit is fixed on the mounting bracket and drives the brush to rotate.

2. The automatic cleaning mechanism according to claim 1, characterized in that, It also includes a base frame, the X-axis slide rail is fixed to one side of the top of the base frame, and a guide rail extending in a first direction is fixed to the other side of the top of the base frame. The bottom of one end of the Y-axis slide rail is slidably engaged with the X-axis slide rail through a first slider, and the bottom of the other end of the Y-axis slide rail is slidably engaged with the guide rail through a second slider.

3. The automatic cleaning mechanism according to claim 2, characterized in that, It also includes two sets of sliding limiting members arranged opposite each other below the bottom frame. Each set of sliding limiting members includes at least one limiting block. The upper surface of the limiting block is provided with a limiting through groove. The bottom of the bottom frame is fixed with two limiting strips corresponding to the two sets of sliding limiting members. The limiting strips are embedded in the limiting through grooves and can slide relative to the limiting blocks in the horizontal plane. The cross-sectional shape of the limiting strips is adapted to the cross-sectional shape of the limiting through grooves.

4. The automatic cleaning mechanism according to claim 3, characterized in that, A pull-out handle is fixed to one side of the lower part of the bottom frame. Two extension arms are fixed to the side of the lower part of the bottom frame opposite to the pull-out handle. The two extension arms correspond to two limiting strips one by one, and the limiting strips extend from the end of the lower surface of the bottom frame adjacent to the pull-out handle to the end of the lower surface of the extension arm away from the pull-out handle.

5. The automatic cleaning mechanism according to any one of claims 2-4, characterized in that, The X-axis drive component includes a first motor fixed on the X-axis slide rail, a first lead screw that is driven and connected to the output shaft of the first motor and extends along a first direction, a first slider that is sleeved on the first lead screw and is limited and engaged with the X-axis slide rail in the vertical direction, and the first slider and the first lead screw are threaded together.

6. The automatic cleaning mechanism according to claim 1, characterized in that, The Y-axis drive component includes a second motor fixed to one end of the Y-axis slide rail, a second lead screw that is driven and connected to the output shaft of the second motor and extends along the second direction, and a third slider that is sleeved on the second lead screw and limited to the Y-axis slide rail in the vertical direction. The third slider is threadedly engaged with the second lead screw and is fixedly connected to one side of the Z-axis slide rail.

7. The automatic cleaning mechanism according to claim 6, characterized in that, The upper part of the third slider is fixed with a triangular reinforcing plate that is fixedly connected to the Z-axis slide rail.

8. The automatic cleaning mechanism according to claim 1, characterized in that, The Z-axis drive component includes a third motor fixed to the bottom end of the Z-axis slide rail, a third lead screw that is driven and connected to the output shaft of the third motor and extends upward in the vertical direction, and a fourth slider that is sleeved on the third lead screw and limited to the Z-axis slide rail in the horizontal direction. The fourth slider is threadedly engaged with the third lead screw and is fixedly connected to the mounting bracket.

9. The automatic cleaning mechanism according to claim 8, characterized in that, The mounting bracket includes a horizontal part fixedly connected to the fourth slider and a vertical part fixed to the upper part of the horizontal part and extending vertically upward. The brush is rotatably mounted on the top of the vertical part via a rotating shaft, and the brush is detachably connected to the rotating shaft. The brush drive is a fourth motor that is driven and coaxially rotated with the rotating shaft; or the brush drive includes a fifth motor fixed on the horizontal part, a driving belt gear rotatably mounted on the horizontal part and driven and connected to the output shaft of the fifth motor, a driven belt gear rotatably mounted on the top of the vertical part and driven and connected to the rotating shaft, and a gear belt arranged vertically and straddling the driving belt gear and the driven belt gear.

10. The automatic cleaning mechanism according to claim 1, characterized in that, At least one position sensor is provided on each of the X-axis slide rail, Y-axis slide rail, and Z-axis slide rail; a CCD camera is mounted on the X-axis slide rail, Y-axis slide rail, or Z-axis slide rail, and the detection area of ​​the CCD camera is located above the brush.

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