A pretreatment device for printed circuit board processing

Abstract

The application discloses a pretreatment device for printed circuit board processing and relates to the technical field of printed circuit board tinning, which comprises a rack, stand columns arranged on the two sides of the rack and a guide table arranged on the top end of the stand columns. The application realizes soft and accurate centering of the circuit board by the centering assembly driven by the reverse thread, the horizontal guide wheel and the rubber sleeve, avoids scratching and position deviation, and the automatic clamp of the cam clamp and the arc-shaped ejector pin is used for enhancing the clamping force by gravity self-locking, is rapidly responded by pneumatic control, is stable in clamping and does not damage the circuit board. The guide key in the limiting assembly can be rotated by 90 degrees, cooperates with the driving roller and the sliding belt, realizes automatic import and export of the circuit board, is small in friction and has no jamming. The intermittent mechanism drives the rotating table to accurately index, cooperates with multiple clamping pieces to realize parallel work, greatly improves production efficiency, the connecting piece is linked with the sliding block, the limiting assembly can be synchronously adjusted with the centering assembly, and different widths of the circuit board can be adapted.

Description

Technical Field

[0001] This invention relates to the technical field of tin plating on printed circuit boards, and in particular to a pretreatment device for printed circuit board processing. Background Technology

[0002] In the SMT assembly process of printed circuit boards (PCBs), surface cleaning is a key step in removing oil and oxides.

[0003] However, existing pre-processing equipment usually requires manual assistance for loading, unloading and centering of circuit boards, resulting in low automation and difficulty in improving overall production efficiency. In addition, traditional devices can only process a single side during the cleaning process. The other side of the circuit board needs to be flipped over and passed through the cleaning equipment a second time, which greatly reduces the cleaning efficiency of the cleaning equipment. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above and / or existing pretreatment apparatuses for printed circuit board processing, the present invention is proposed.

[0006] Therefore, the problem to be solved by the present invention is how to solve the problems that existing tin plating equipment usually requires manual assistance, has a low degree of automation, affects the overall production efficiency, and is prone to uneven plating or circuit board detachment.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a pre-processing device for printed circuit board processing, comprising a frame, columns disposed on both sides of the frame, a guide platform disposed on the top of the columns, a shaft rotatably disposed inside the guide platform, sliders disposed at both ends of the shaft, a centering component disposed at the bottom end of the slider, a rotating platform rotatably disposed above a cleaning tank, a clamping component slidably disposed on the outer periphery of the rotating platform, a connecting component fixedly connected to the slider, a limiting component disposed at the bottom end of the connecting component and located on both sides of the rotating platform, and an intermittent mechanism disposed on one side of the rotating platform, the intermittent mechanism causing the rotating platform to rotate intermittently, the centering component, the clamping component, and the limiting component being used for centering and transporting the printed circuit board.

[0008] In a preferred embodiment of the pretreatment device for printed circuit board processing described in this invention, the shaft has two external threads with opposite directions of rotation at both ends, and the slider engages with the corresponding external threads.

[0009] In a preferred embodiment of the pretreatment device for printed circuit board processing according to the present invention, the guide table has a sliding opening on its inner side, the shaft is rotatably disposed inside the sliding opening, and the slider is disposed on both sides inside the sliding opening.

[0010] As a preferred embodiment of the pretreatment device for printed circuit board processing according to the present invention, the clamping member includes a guide block that slides and engages with a slide groove, a centering groove is opened at the center of the guide block, an automatic clamp is set inside the centering groove, including a rotating cavity opened on the inner wall of the centering groove, a cam clamp rotatably set inside the rotating cavity, an arc-shaped top rod set inside the rotating cavity, a spring set inside the arc-shaped top rod, an air pump connected to its outer shell, and a telescopic end fixedly connected to one side of the cam clamp.

[0011] As a preferred embodiment of the pretreatment device for printed circuit board processing according to the present invention, the limiting component includes a right-angle plate fixedly connected to a connector. A sliding plate is slidably disposed inside both connectors. The sliding plate is disposed on both sides of the top of the truss to guide the connector. A drive roller is disposed on the side of the right-angle plate, and a guide key is disposed inside the right-angle plate. The drive roller includes several guide wheels rotatably connected to the right-angle plate. A drive pulley is disposed at one end of the guide wheel, and a transmission belt is disposed on the outer periphery of the drive pulley. A motor is disposed at the axis of one of the guide wheels. The guide key includes a rotating rod whose two ends are rotatably connected to the right-angle plate via a connecting plate. A right-angle reset component is disposed inside the connecting plate. Four support plates are arranged in a circular array on the outer periphery of the rotating rod. A sliding belt is rotatably disposed at the top of the support plate, and the top surface of the sliding belt and the axis of the rotating rod are located on the same plane.

[0012] As a preferred embodiment of the pretreatment device for printed circuit board processing according to the present invention, the centering component includes a base plate fixedly connected to a slider, a plurality of transverse guide wheels are provided and rotatably disposed at the bottom end of the base plate, and a rubber sleeve is fixedly disposed on the outer surface of the transverse guide wheels.

[0013] In a preferred embodiment of the pretreatment device for printed circuit board processing according to the present invention, the rotating table is provided with a receiving key and a tension spring inside. The receiving key is fixedly disposed inside the rotating table, and several tension springs are provided, one end of which is fixedly connected to the outer periphery of the receiving key, and the other end of which is fixedly connected to a guide block. A truss is provided above the cleaning tank for rotating the rotating table above the cleaning tank. The cleaning mechanism includes a lifting platform with a clearance groove in the center and plasma cleaning nozzles on both sides of the top of the clearance groove.

[0014] In a preferred embodiment of the pretreatment device for printed circuit board processing according to the present invention, the right-angle reset component includes a first cam fixedly connected to a rotating rod, a second cam slidably connected to a connecting plate, and a reset spring provided between the second cam and the connecting plate.

[0015] In a preferred embodiment of the pretreatment device for printed circuit board processing according to the present invention, the transmission assembly includes rollers disposed on both sides of the upper end of the frame, and a conveyor belt is sleeved on the outer periphery of the two rollers.

[0016] As a preferred embodiment of the pretreatment device for printed circuit board processing according to the present invention, the intermittent mechanism includes an intermittent wheel disposed on one side of the truss and fixedly coaxially with the rotating table, a drive wheel rotatably connected to the truss, and a drive wheel and an intermittent wheel in a transmission cooperation, wherein the number of intermittent wheels is the same as the number of clamping components.

[0017] The beneficial effects of this invention are as follows: The centering component driven by the reverse thread, in conjunction with the transverse guide wheel and rubber sleeve, achieves gentle and precise centering of the circuit board, avoiding scratches and positional deviations. The automatic clamping device, with its cam clamp and arc-shaped top rod, utilizes gravity self-locking to enhance clamping force. Simultaneously, the pneumatic control provides rapid response, stable clamping without damaging the circuit board. The guide key in the limiting component can rotate 90°, working with the drive roller and sliding belt to achieve automatic board loading and unloading with low friction and no jamming. The intermittent mechanism drives the rotary table for precise indexing, enabling parallel operation with multiple clamping components, significantly improving production efficiency. The connecting component and slider are linked, allowing the limiting component to adjust synchronously with the centering component, adapting to circuit boards of different widths. Furthermore, the cleaning mechanism can clean both sides of the circuit board simultaneously, further improving cleaning efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A scene illustration of a pre-processing device for printed circuit board manufacturing.

[0020] Figure 2 Structure of a pretreatment device for printed circuit board processing Figure 1 .

[0021] Figure 3 Structure of a pretreatment device for printed circuit board processing Figure 2 .

[0022] Figure 4 A structural diagram of the guide table for a pre-processing device used in printed circuit board manufacturing.

[0023] Figure 5 A structural diagram of the intermittent mechanism of a pretreatment device for printed circuit board processing.

[0024] Figure 6 A structural diagram of the centering component of a pre-processing device for printed circuit board manufacturing.

[0025] Figure 7 A structural diagram of the rotating table for a pre-processing device used in printed circuit board manufacturing.

[0026] Figure 8 A structural diagram of a limiting component for a pre-processing device used in printed circuit board manufacturing.

[0027] Figure 9 Pre-processing equipment for printed circuit board manufacturing Figure 8 Enlarged view of the structure at point B.

[0028] Figure 10 Pre-processing equipment for printed circuit board manufacturing Figure 7 Enlarged view of the structure at point A.

[0029] In the diagram: 1. Frame; 2. Transmission assembly; 21. Roller; 22. Conveyor belt; 3. Column; 4. Guide table; 41. Slide; 5. Shaft; 51. External thread; 6. Slider; 7. Centering assembly; 71. Base plate; 72. Transverse guide wheel; 73. Rubber sleeve; 8. Cleaning tank; 81. Cleaning mechanism; 811. Lifting platform; 812. Clearance groove; 813. Plasma cleaning nozzle; 9. Truss; 10. Rotating table; 101. Slide groove; 102. Receiving key; 103. Tension spring; 11. Clamping component; 111. Guide block; 112. Centering groove; 113. Automatic clamp. ; 1131, Rotating cavity; 1132, Cam clamp; 1133, Arc-shaped top rod; 12, Slide plate; 13, Connecting piece; 14, Limiting assembly; 141, Right-angle plate; 142, Drive roller; 1421, Guide wheel; 1422, Drive pulley; 1423, Transmission belt; 1424, Motor; 143, Rotating rod; 144, Connecting plate; 145, Right-angle reset piece; 1451, First cam; 1452, Second cam; 1453, Reset spring; 146, Support plate; 147, Sliding belt; 15, Intermittent mechanism; 151, Intermittent wheel; 152, Drive wheel. Detailed Implementation

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0033] Example 1, referring to Figures 1-10 This is the first embodiment of the present invention. This embodiment provides a pre-processing device for printed circuit board processing. The pre-processing device for printed circuit board processing includes a frame 1, a transmission assembly 2, a column 3, a guide table 4, a shaft 5, a slider 6, a centering assembly 7, a cleaning pool 8, a truss 9, a rotating table 10, a clamping member 11, a sliding plate 12, a connecting member 13, a limiting assembly 14, and an intermittent mechanism 15.

[0034] Specifically, the frame 1 is fixedly installed as the mounting base for the entire device. Columns 3 are located on both sides of the frame 1, and a guide platform 4 is located at the top of the column 3. The inlet end of the guide platform 4 is flared to guide the printed circuit board into the conveyor belt 22. A sliding opening 41 is provided on the inner side of the guide platform 4. A shaft 5 is rotatably mounted inside the sliding opening 41. Both ends of the shaft 5 are provided with oppositely oriented external threads 51. Slider 6 is located on both sides inside the sliding opening 41 and threadedly engages with the corresponding external threads 51. When the shaft 5 rotates, because the two threads rotate in opposite directions, the two sliders 6 will move synchronously towards or away from each other, thereby causing the lower centering assembly 7 to move closer or further apart. This screw-based centering method has a simple structure, smooth movement, and, through the self-locking characteristic of the threads, can maintain a stable position after centering, avoiding centering misalignment due to vibration. Furthermore, as... Figure 6 As shown, one end of the shaft 5 extends out of the slide 41 and is connected to a centering motor for driving its rotation.

[0035] Specifically, the centering component 7 is located at the bottom of the slider 6 and is used to clamp the printed circuit board to be tinned and center it. After the printed circuit board is fed in by the conveyor belt 22, the centering component 7 touches the edge of the circuit board from both sides and pushes it to the center line of the conveyor belt 22. This ensures that the circuit board can accurately enter the limiting component 14 and the clamping component 11 in subsequent processes, avoiding jamming or uneven cleaning due to positional deviation.

[0036] A cleaning pool 8 is located on one side of the frame 1 and is used to install the cleaning mechanism 81. A truss 9 is located above the cleaning pool 8. A rotating platform 10 is located at the top center of the truss 9. The rotating platform 10 is cylindrical and has several grooves 101 on its outer periphery. A clamping member 11 is slidably disposed inside the groove 101 and is used to fix the printed circuit board. Since the clamping member 11 can slide radially inside the groove 101, when the rotating platform 10 rotates, the clamping member 11 can adaptively adjust its position under the action of centrifugal force or tension spring 103 to ensure that the circuit board enters the cleaning pool 8 smoothly.

[0037] The slide plate 12 is set on both sides of the top of the truss 9. The connector 13 is slidably set on both sides of the slide plate 12 and fixedly connected to the slider 6. Through this connection, when the slider 6 moves, the connector 13 moves synchronously, thereby driving the limiting component 14 to adjust its position to adapt to circuit boards of different widths and realize flexible production.

[0038] Specifically, the limiting component 14 is disposed at the bottom end of the connector 13 and located on both sides of the rotating table 10, for guiding the printed circuit board into the clamping component 11. The limiting component 14 includes rollers and a guide structure, which can provide guidance and thrust when the circuit board enters and exits, ensuring that the circuit board is accurately inserted into the centering slot 112.

[0039] Intermittent mechanism 15 is located on one side of truss 9 and is used to drive turntable 10 to rotate intermittently. The number of intermittent cycles of intermittent mechanism 15 is the same as the number of clamping parts 11, so that each time there is a pause, one clamping part 11 is located at the loading / unloading station and the other is located at the cleaning station, which corresponds to the cleaning mechanism 81, thereby achieving continuous operation and greatly improving production efficiency.

[0040] Example 2, refer to Figures 1-10 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0041] Specifically, the transmission assembly 2 includes rollers 21, which are set on both sides of the upper end of the frame 1. The conveyor belt 22 is sleeved on the outer periphery of the two rollers 21. The rollers 21 are driven to rotate by the motor 1424, which drives the conveyor belt 22 to move at a constant speed, so as to smoothly transport the printed circuit board to the centering station. The surface of the conveyor belt 22 can be provided with anti-slip texture to prevent the circuit board from slipping and ensure the conveying accuracy.

[0042] Specifically, the intermittent mechanism 15 includes an intermittent wheel 151 and a drive wheel 152. The intermittent wheel 151 is located on one side of the truss 9 and is fixedly coaxially with the rotary table 10. The drive wheel 152 is rotatably connected to the truss 9 and is driven by the intermittent wheel 151. The number of intervals of the intermittent wheel 151 is the same as the number of clamping parts 11. The drive wheel 152 is driven to rotate continuously by a servo motor 1424. Through the pins or gears on it, it intermittently pushes the intermittent wheel 151 to rotate a fixed angle, thereby driving the rotary table 10 to accurately index. This intermittent transmission method has accurate positioning and no cumulative error, ensuring that each station can accurately stop at the predetermined position.

[0043] Specifically, the clamping component 11 includes a guide block 111, a centering groove 112, and an automatic clamp 113. The guide block 111 is slidably engaged with the slide groove 101. The centering groove 112 is located at the center of the guide block 111, and the center line of the centering groove 112 is on the same plane as the axis of the rotating table 10. The automatic clamp 113 is disposed inside the centering groove 112 and is used to clamp the printed circuit board. The guide block 111 can slide radially within the slide groove 101. When the circuit board is inserted into the centering groove 112, the guide block 111 will automatically fine-tune its position so that the center of the circuit board is always aligned with the axis of the rotating table 10, thus avoiding uneven cleaning due to rotational eccentricity.

[0044] Specifically, the automatic clamp 113 includes a rotating cavity 1131, a cam clamp 1132, and an arc-shaped push rod 1133. The rotating cavity 1131 is located on the inner wall of the centering groove 112. The cam clamp 1132 is rotatably mounted inside the rotating cavity 1131. The arc-shaped push rod 1133 is located inside the rotating cavity 1131 and contains a spring. Its outer shell is connected to an air pump, and its telescopic end is fixedly connected to one side of the cam clamp 1132. When the circuit board enters the centering groove 112, it pushes the cam clamp 1132 to unfold, compressing the arc-shaped push rod 1133 and simultaneously squeezing the spring inside. The cam clamp 1132 then clamps the circuit board. The air pump presses against the edge of the circuit board. When it needs to be released, the air pump expels the air inside the arc-shaped push rod 1133. At this time, the arc-shaped push rod 1133 can continue to retract, and the cam clamp 1132 can release the clamping and fixing of the printed circuit board, so that the printed circuit board can be directly pulled out. After clamping, when the printed circuit board is facing downward, the weight of the printed circuit board will pull the cam clamp 1132 downward. The clamping force of the cam clamp 1132 is matched with the weight of the printed circuit board, which can effectively prevent the printed circuit board from loosening and also prevent damage to the surface of the circuit board. At the same time, the pneumatic control responds quickly and is easy to automate.

[0045] Specifically, the limiting component 14 includes a right-angle plate 141, a drive roller 142, and a guide key. The right-angle plate 141 is fixedly connected to the connecting member 13. The drive roller 142 is located on the side of the right-angle plate 141. The guide key is located inside the right-angle plate 141 and includes a rotating rod 143, a connecting plate 144, a right-angle reset member 145, a support plate 146, and a sliding belt 147. The two ends of the rotating rod 143 are rotatably connected to the right-angle plate 141 via the connecting plate 144. The right-angle reset member 145 is located inside the connecting plate 144 and limits the rotating rod 143 to only 90° rotation. Four support plates 146 are arranged in a circular array on the outer periphery of the rotating rod 143. The sliding belt 147 is rotatably mounted on the top of the support plate 146, with its top surface and the axis of the rotating rod 143 on the same plane. When the circuit board is conveyed by the conveyor belt 22 to… When the circuit board enters the limiting component 14, it first enters between the two right-angle plates 141 and is lifted by the sliding belt 147 on the support plate 146. The drive roller 142 rotates and pushes the circuit board forward until it is inserted into the centering groove 112 of the clamping member 11. During the process of the circuit board entering, the guide key plays an auxiliary guiding and supporting role. When the circuit board is clamped and rotated to the other side with the rotating table 10, the drive roller 142 of the other set of limiting components 14 rotates in the opposite direction. At the same time, the circuit board pushes the rotating rod 143 of the guide key to rotate 90°, so that the support plate 146 changes from horizontal to vertical, making room for the circuit board to enter smoothly and be pushed out by the drive roller 142. The right-angle reset member 145 ensures that the rotating rod 143 can rotate automatically when it is turned, preparing for the next insertion. This makes the circuit board enter and exit smoothly without manual intervention, and the sliding belt 147 reduces friction and prevents scratches.

[0046] Specifically, the drive roller 142 includes a guide wheel 1421, a drive pulley 1422, a transmission belt 1423, and a motor 1424. Several guide wheels 1421 are provided and are rotatably connected to the right-angle plate 141. The drive pulley 1422 is located at one end of the guide wheel 1421. The transmission belt 1423 is located on the outer periphery of the drive pulley 1422. The motor 1424 is located at the axis of one of the guide wheels 1421 and is used to drive the guide wheel 1421 to rotate. Multiple guide wheels 1421 rotate synchronously through the transmission belt 1423, jointly pushing the circuit board to move. The thrust is uniform and stable. The motor 1424 is a servo motor 1424, which can precisely control the speed and position of the circuit board entering and exiting.

[0047] Specifically, the centering component 7 includes a base plate 71, transverse guide wheels 72, and a rubber sleeve 73. The base plate 71 is fixedly connected to the slider 6. Several transverse guide wheels 72 are provided and rotatably disposed at the bottom end of the base plate 71. The rubber sleeve 73 is fixedly disposed on the outer surface of the transverse guide wheels 72. When the centering component 7 moves toward the circuit board, the transverse guide wheels 72 first contact the edge of the circuit board. Since they can rotate freely, they can guide the circuit board to move smoothly and avoid jamming. The rubber sleeve 73 has micro-elasticity, which can buffer the contact force and prevent scratching the surface of the circuit board. At the same time, it increases the friction to ensure that the circuit board will not slip during the centering process.

[0048] Specifically, the rotating table 10 is internally provided with a receiving key 102 and a tension spring 103. The receiving key 102 is fixedly disposed inside the rotating table 10. Several tension springs 103 are provided, one end of which is fixedly connected to the outer periphery of the receiving key 102, and the other end is fixedly connected to the guide block 111. The tension spring 103 always applies a pulling force to the guide block 111 toward the axis of the rotating table 10, so that the clamping member 11 is in a retracted state when there is no circuit board, avoiding interference. When the circuit board is inserted, and when the circuit board rotates to the downward position, the guide block 111 is pushed outward, so that the circuit board can be fully inserted into the cleaning pool 8. The tension spring 103 is stretched, generating a restoring force. After cleaning is completed and when rotating upward, the tension spring 103 pulls the guide block 111 to retract and reset.

[0049] The cleaning mechanism 81 includes a lifting platform 811, a clearance groove 812 is provided at the center of the lifting platform 811, and plasma cleaning nozzles 813 are provided on both sides of the top of the clearance groove 812. When the circuit board rotates into the cleaning tank 8 and is perpendicular to the cleaning tank 8, it corresponds to the position of the cleaning mechanism 81. At this time, the lifting platform 811 moves upward and gradually inserts the circuit board into the clearance groove 812. During the gradual insertion process, the plasma cleaning nozzles 813 located on both sides of the top of the clearance groove 812 can simultaneously perform plasma cleaning on both sides of the circuit board. Compared with the single-sided cleaning in the prior art, it can greatly improve the cleaning efficiency and thus improve production efficiency.

[0050] Specifically, the right-angle reset component 145 includes a first cam 1451, which is fixedly connected to the rotating rod 143, and a second cam 1452, which is slidably connected to the connecting plate 144. A reset spring 1453 is provided between the second cam 1452 and the connecting plate 144. When the rotating rod 143 rotates, the first cam 1451 rotates accordingly, pushing the second cam 1452 to compress the reset spring 1453. When the external force disappears, the reset spring 1453 pushes the second cam 1452 to move in the opposite direction, thereby pushing the first cam 1451 to rotate 90 degrees through the arc surface of the cam. At this time, the rotating rod 143 returns to the initial position, ensuring that the support plate 146 can be accurately reset to the horizontal state each time.

[0051] In use, the printed circuit board that needs to be cleaned is first conveyed into the device by the conveyor belt 22 of the transmission component 2. The conveyor belt 22 moves at a constant speed under the drive of the roller 21, and smoothly delivers the circuit board to the centering station. When the circuit board reaches the preset position, the shaft 5 starts to rotate. Since the two ends of the shaft 5 are provided with external threads 51 with opposite directions of rotation, the two sliders 6 that are threaded to it move synchronously towards each other along the sliding opening 41, driving the centering component 7 to move closer to the circuit board from both sides. The transverse guide wheel 72 of the centering component 7 first contacts the edge of the circuit board. The transverse guide wheel 72 can rotate freely. With the elastic cushioning of the rubber sleeve 73 on its outer surface, it can gently guide the circuit board to the center line of the conveyor belt 22 to achieve precise centering. This process not only ensures the positioning accuracy of subsequent processes, but also avoids the scratches on the circuit board that may be caused by traditional centering methods.

[0052] After alignment, the circuit board continues to be conveyed forward and enters the working range of the limiting component 14. At this time, the guide key of the limiting component 14 is in the initial state, the tray 146 is horizontally unfolded, the sliding belt 147 lifts the bottom of the circuit board, and the drive roller 142 starts to rotate under the drive of the motor 1424. Through the transmission belt 1423, multiple guide wheels 1421 are driven to rotate synchronously, pushing the circuit board smoothly towards the clamping member 11 on the rotating table 10. The front end of the circuit board is gradually inserted into the centering groove 112 of the clamping member 11. Since the guide block 111 can slide radially in the slide groove 101 and is flexibly pulled by the tension spring 103, the circuit board will automatically adjust its position when inserted to ensure that the center of the centering groove 112 is aligned with the center of the circuit board.

[0053] After the circuit board is fully inserted into the centering slot 112, the automatic clamp 113 starts to work. The arc-shaped top rod 1133 pushes the cam clamp 1132 to rotate under the action of its internal spring. The clamping surface of the cam clamp 1132 presses against the edge of the circuit board to clamp it. This clamping method of the cam clamp 1132 has a self-locking characteristic. When the circuit board rotates with the rotating table 10 to the bottom and enters the cleaning pool 8, the weight of the circuit board will further increase the clamping force of the cam clamp 1132, making the clamping more reliable and effectively preventing the circuit board from loosening during the cleaning process. At the same time, since the clamping force and gravity are matched, the surface of the circuit board will not be damaged due to excessive clamping force.

[0054] Subsequently, the intermittent mechanism 15 is activated, driving the drive wheel 152 to rotate continuously. Through the pin or gear, the intermittent wheel 151 is pushed to rotate at a fixed angle, thereby driving the rotary table 10 to rotate precisely by one station. At this time, the clamping member 11 holding the circuit board rotates with the rotary table 10 to directly above the cleaning pool 8 and continues to descend so that the circuit board can be fully inserted into the clearance groove 812. At the same time, the circuit board that has been cleaned is ready to enter the limiting component 14 on the other side for unloading.

[0055] During the cleaning process, since the guide block 111 of the clamping member 11 can slide radially within the slide groove 101, and with the flexible connection of the tension spring 103, when the circuit board corresponds to the cleaning mechanism 81, it can slide downward so that the circuit board can be inserted into the interior of the clearance groove. After cleaning, the circuit board rotates upward, and the tension spring 103 is stretched to generate a restoring force. When the cleaning is completed and the circuit board rotates upward to leave the tin plating liquid, the tension spring 103 pulls the guide block 111 to retract and reset, preparing for the next cleaning.

[0056] After cleaning, the cleaning mechanism 81 retracts downwards, and the intermittent mechanism 15 actuates again, rotating the cleaned circuit board to the limiting component 14 on the other side. At this time, the drive roller 142 of the limiting component 14 rotates in the opposite direction under the drive of the motor 1424, pulling the circuit board outward from the centering groove 112. During the circuit board's exit, the rotating rod 143 of the guide key rotates 90°. When the rotating rod 143 rotates, the first cam 1451, which is fixedly connected to it, rotates accordingly, pushing the second cam 1452 to compress and retract. After the spring 1453 and the rotating rod 143 rotate 90°, the support plate 146 changes from a horizontal state to a vertical state, clearing the passage. The circuit board is smoothly ejected under the push of the drive roller 142 and is conveyed onto the conveyor belt 22 for delivery. After the circuit board is completely ejected, the external force on the guide key disappears, and the reset spring 1453 pushes the second cam 1452 to move in the opposite direction. Through the cam arc surface, it pushes the first cam 1451 to rotate in the opposite direction by 90°, so that the rotating rod 143 and the support plate 146 automatically return to the horizontal state, ready to receive the next circuit board.

[0057] Throughout the process, the number of intervals of the intermittent mechanism 15 is the same as the number of clamping parts 11, enabling multiple stations to work in parallel: one station is used for loading and clamping, one station is used for cleaning, and one station is used for unloading, without interfering with each other. This design greatly improves production efficiency. At the same time, the precise coordination of the centering component 7, the limiting component 14, the clamping parts 11, and each reset mechanism ensures the consistency and reliability of cleaning.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A pretreatment apparatus for printed circuit board processing, characterized in that: include The frame (1), the columns (3) on both sides of the frame (1), and the guide platform (4) on the top of the column (3). The shaft (5) is rotatably mounted inside the guide plate (4). The slider (6) is located at both ends of the shaft (5). The centering component (7) is located at the bottom of the slider (6). A cleaning pool (8) is located on one side of the frame (1), and a cleaning mechanism (81) is installed inside the cleaning pool (8). The rotating platform (10) is rotatably positioned above the cleaning tank (8). The clamping member (11) is slidably disposed on the outer periphery of the rotating table (10). The connector (13) is fixedly connected to the slider (6). The limiting component (14) is located at the bottom end of the connector (13) and on both sides of the rotating platform (10). The intermittent mechanism (15) is located on one side of the rotating platform (10). Intermittent mechanism (15) causes the turntable (10) to rotate intermittently, and centering assembly (7), clamping member (11) and limiting assembly (14) are used for centering and transferring printed circuit boards.

2. The pretreatment apparatus for printed circuit board processing as described in claim 1, characterized in that: The shaft (5) has two external threads (51) with opposite directions of rotation at both ends, and the slider (6) is threadedly engaged with the corresponding external threads (51).

3. The pretreatment apparatus for printed circuit board processing as described in claim 1 or 2, characterized in that: The guide platform (4) has a sliding opening (41) on its inner side. The shaft (5) is rotatably disposed inside the sliding opening (41), and the slider (6) is disposed on both sides inside the sliding opening (41).

4. The pretreatment apparatus for printed circuit board processing as described in claim 1, characterized in that: The clamping member (11) includes The guide block (111) slides into the groove (101). The middle channel (112) is located at the center of the guide block (111). The automatic clamp (113) is disposed inside the centering groove (112), including The rotating cavity (1131) is located on the inner wall of the centering groove (112). The cam clip (1132) is rotatably mounted inside the rotating cavity (1131). An arc-shaped push rod (1133) is located inside the rotating cavity (1131). A spring is installed inside the arc-shaped push rod (1133). An air pump is connected to its outer shell. The telescopic end is fixedly connected to one side of the cam clamp (1132).

5. The pretreatment apparatus for printed circuit board processing as described in claim 1, characterized in that: The limiting component (14) includes The right-angle plate (141) is fixedly connected to the connector (13). The two connectors (13) have a sliding plate (12) inside them. The sliding plate (12) is located on both sides of the top of the truss (9) and is used to guide the connector (13). The drive roller (142) is located on the side of the right angle plate (141), and the guide key is located inside the right angle plate (141); The drive roller (142) includes Several guide wheels (1421) are provided and are rotatably connected to the right-angle plate (141). The drive pulley (1422) is located at one end of the guide pulley (1421). The transmission belt (1423) is located on the outer periphery of the drive pulley (1422), and the motor (1424) is located at the shaft center of one of the guide pulleys (1421). Guide keys include The two ends of the rotating rod (143) are rotatably connected to the right-angle plate (141) via the connecting plate (144). The right-angle reset component (145) is located inside the connecting plate (144). Four trays (146) are arranged in a circular array on the outer periphery of the rotating rod (143). The sliding belt (147) is rotatably mounted on the top of the support plate (146), and the top surface of the sliding belt (147) and the axis of the rotating rod (143) are on the same plane.

6. The pretreatment apparatus for printed circuit board processing as described in claim 5, characterized in that: The centering component (7) includes The base plate (71) is fixedly connected to the slider (6). Several transverse guide wheels (72) are provided and are rotatably mounted at the bottom end of the base plate (71). The rubber sleeve (73) is fixedly installed on the outer surface of the transverse guide wheel (72).

7. The pretreatment apparatus for printed circuit board processing as described in claim 6, characterized in that: The rotating platform (10) is provided with a receiving key (102) and a tension spring (103) inside. The receiving key (102) is fixedly installed inside the rotating platform (10), and there are several tension springs (103). One end of the tension spring is fixedly connected to the outer periphery of the receiving key (102), and the other end is fixedly connected to the guide block (111). A truss (9) is provided above the cleaning pool (8) to rotate the rotating platform (10) above the cleaning pool; The cleaning mechanism (81) includes a lifting platform (811), a clearance groove (812) is provided at the center of the lifting platform (811), and plasma cleaning nozzles (813) are provided on both sides of the top of the clearance groove (812).

8. The pretreatment apparatus for printed circuit board processing as described in claim 5, characterized in that: The right-angle reset component (145) includes The first cam (1451) is fixedly connected to the rotating rod (143). The second cam (1452) is slidably connected to the connecting plate (144), and a return spring (1453) is provided between the second cam (1452) and the connecting plate (144).

9. The pretreatment apparatus for printed circuit board processing as described in claim 5, characterized in that: The transmission assembly (2) includes rollers (21) which are disposed on both sides of the upper end of the frame (1), and the conveyor belt (22) is sleeved on the outer periphery of the two rollers (21).

10. The pretreatment apparatus for printed circuit board processing as described in claim 7, characterized in that: The intermittent mechanism (15) includes The intermittent wheel (151) is located on one side of the truss (9) and is fixedly mounted coaxially with the rotating platform (10). The drive wheel (152) is rotatably connected to the truss (9), and the drive wheel (152) is driven by the intermittent wheel (151). The number of intermittent wheels (151) is the same as the number of clamping parts (11).

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