Circuit board high-precision silk-screen printing equipment and processing method thereof

Abstract

The invention relates to the field of circuit board machining, in particular to circuit board high-precision silk-screen printing equipment and a machining method thereof.The circuit board high-precision silk-screen printing equipment comprises an exchange device and at least two silk-screen printing machine bodies, each silk-screen printing machine body comprises a machining part, a rotating part and a plurality of conveying belts, and the rotating parts are rotationally connected to the surfaces of the machining parts; the multiple conveying belts are connected to the surface of the rotating part at intervals around the axis of the rotating part, the rotating part is provided with a feeding station, a machining station and a discharging station at intervals around the axis of the rotating part, and the exchange device comprises a base, an exchange assembly, at least two feeding belts and at least two discharging belts. Through the arrangement of the exchange assembly, the printing equipment can enter at least two circuit boards at a time, the feeding and processing efficiency of the circuit boards is improved, only the exchange device needs to be additionally arranged when the printing equipment is additionally arranged on one production line, transformation of other equipment of the production line is reduced, the occupied area of transformation is reduced, and therefore the processing cost of the circuit boards is reduced.

Description

Technical Field

[0001] This application relates to the field of circuit board processing, and in particular, to a high-precision screen printing device for circuit boards and its processing method. Background Technique

[0002] A circuit board is a conductive board used to connect and support electronic components. Through pre-designed conductive paths, electronic components are connected together according to the circuit principle, thereby realizing various functions of electronic devices.

[0003] During the production process of circuit boards, after printing and coating solder paste, the circuit boards are heated through a specific reflow temperature curve to melt the solder paste, and the alloy components therein will be fixed between the electronic components and the circuit board after cooling; usually, when the circuit boards produced on the assembly line enter the printing device, their positions need to be consistent with the center of the rotary processing table to ensure the accuracy during subsequent printing. After adjustment, the processing table rotates to the processing position, and the solder paste is printed on the designated position of the circuit board by the screen printing device.

[0004] However, with the increasing requirements for the processing efficiency of circuit boards in industrial production, the conventional printing device can only process one circuit board at a time, and the feeding and processing efficiency is too low. However, the cost of adding an additional production line is relatively high, and the floor area for transformation increases, thereby increasing the processing cost of circuit boards. Summary of the Invention

[0005] In order to improve the problem of the processing efficiency of circuit boards, this application provides a high-precision screen printing device for circuit boards and its processing method.

[0006] In a first aspect, a high-precision screen printing device for circuit boards provided by this application adopts the following technical solutions: A high-precision screen printing device for circuit boards, comprising an exchange device and at least two screen printing machine bodies. The exchange device is located between the two screen printing machine bodies. The screen printing machine body includes a processing part, a rotating part, and a plurality of conveyor belts. The rotating part is rotatably connected to the surface of the processing part. The plurality of conveyor belts are connected to the surface of the rotating part at intervals around the axis of the rotating part. At least two circuit boards can be placed on the surface of the conveyor belt. The rotating part is provided with a loading station, a processing station, and an unloading station at intervals around its axis. The rotating part rotates to drive each conveyor belt to pass through the loading station, the processing station, and the unloading station in sequence. The conveyor belt at the loading station is used for loading and placing at least two circuit boards. The processing part can perform screen printing on one of the circuit boards at the processing station. The conveyor belt at the unloading station rotates in reverse to drive two circuit boards to approach the exchange device. The exchange device includes a base, an exchange component, at least two feeding belts, and at least two discharging belts. At least two of the feeding belts are connected to the base at intervals. The feeding belts correspond to the circuit boards at the unloading station one by one. The exchange component is connected to the base. The exchange component can exchange the circuit boards on the two feeding belts. At least two of the discharging belts are connected to the base at intervals. The discharging belts correspond to the feeding belts one by one. The feeding belt drives the circuit board to enter the surface of the discharging belt. The discharging belt drives the circuit board to be conveyed to another screen printing machine body, and the processing part performs screen printing on the other circuit board at the processing station.

[0007] By adopting the above technical solution, two circuit boards are loaded and placed on the conveyor belt at the loading station of one of the screen printing machine bodies at intervals. The rotating part drives the conveyor belt at the loading station to move to the processing station. The processing part performs screen printing on one of the circuit boards at the processing station. The rotating part drives the conveyor belt at the processing station to move to the unloading station. The conveyor belt at the unloading station rotates in reverse to drive two circuit boards to enter the surface of the feeding belt one by one. The exchange component exchanges the circuit boards on the two feeding belts. The feeding belt drives the circuit boards to enter the surface of the discharging belt one by one. The discharging belt drives the circuit boards to enter the conveyor belt at the loading station of another screen printing machine body. The rotating part drives the conveyor belt at the loading station to move to the processing station. The processing part performs screen printing on the other circuit board at the processing station, so that the position of the circuit board is consistent with the processing end of the processing part, thereby ensuring the accuracy of the circuit board during subsequent printing, enabling the printing device to process at least two circuit boards at a time, improving the feeding and processing efficiency of the circuit boards, and only adding an exchange device when adding a printing device to a production line, reducing the transformation of other equipment on the production line and the floor area of the transformation, thereby reducing the processing cost of the circuit boards.

[0008] Optionally, the exchange component includes at least two board-changing claws, at least two guide rails, and at least two support seats. At least two of the guide rails are connected to the surface of the base at intervals. The length direction of the guide rail is parallel to the arrangement direction of the feeding belts. The support seats correspond to the guide rails one by one and are slidably connected to the surface of the guide rails. The board-changing claws correspond to the support seats one by one and are slidably connected to the surface of the support seats. The sliding direction of the board-changing claws is parallel to the height direction of the base. When the board-changing claws correspond to and abut against the circuit boards on the feeding belts one by one, the board-changing claws slide along the surface of the support seats in a direction away from the feeding belts, and the board-changing claws lift the circuit boards off the surface of the feeding belts. The height of one of the board-changing claws is higher than that of the other board-changing claw. At least two of the support seats slide along the surface of the guide rails in a direction close to the adjacent feeding belt, driving the board-changing claws to move in the direction of the adjacent feeding belt. The board-changing claws slide along the surface of the support seats in a direction close to the feeding belts, and the circuit boards are placed on the surface of the feeding belts.

[0009] By adopting the above technical solution, when two circuit boards on the blanking station of one of the screen printing machine bodies are conveyed to the surfaces of two feeding belts one by one, the board-changing claws correspond to the feeding belts one by one. The board-changing claws slide along the surface of the support seats in a direction away from the base. The top surface of the board-changing claws abuts against the bottom of the circuit boards and lifts the circuit boards off the surface of the feeding belts. The two support seats slide along the surface of the guide rails in a direction close to the adjacent feeding belt, driving the material-changing board to be directly above the adjacent feeding belt. The board-changing claws slide along the surface of the support seats in a direction close to the feeding belts, and the bottom of the circuit boards abuts against the surface of the feeding belts, realizing the position exchange between the processed circuit boards and the unprocessed circuit boards.

[0010] Optionally, the exchange component further includes at least two first synchronous wheels and a first synchronous belt used in cooperation with the first synchronous wheels. At least two of the first synchronous wheels are rotatably connected to the surface of the base at intervals. At least two of the first synchronous wheels are located at both ends of the length of the guide rail. The first synchronous belt is tensioned and connected to the two first synchronous wheels. At least two of the support seats are correspondingly connected to both sides of the first synchronous belt. When the first synchronous wheels rotate, the two support seats slide in opposite directions along the surface of the guide rail.

[0011] By adopting the above technical solution, the first synchronous belt is tensioned and connected to the two first synchronous wheels. When the first synchronous wheels rotate, the first synchronous belt is driven to transmit power. The two support seats are correspondingly connected to both sides of the synchronous belt, driving the support seats to slide in opposite directions along the surface of the guide rail. There is no need to install a power device for each support seat to drive, reducing energy loss, thus reflecting the concept of energy conservation.

[0012] Optionally, a power assembly is connected to the support base. The power assembly includes a power motor, at least two second synchronous pulleys, and a second synchronous belt used in cooperation with the second synchronous pulleys. The power motor is connected to the surface of the support base. The axis of the power motor is parallel to the conveying direction of the feeding belt. One of the second synchronous pulleys is coaxially connected to the motor shaft of the power motor, and the other second synchronous pulley is rotatably connected to the surface of the support base. The second synchronous belt is tensioned and connected to the two second synchronous pulleys. The board-changing claw is connected to the surface of the second synchronous belt. When the power motor operates, it drives the board-changing claw to slide along the surface of the support base.

[0013] By adopting the above technical solution, when the bottom of the board-changing claw abuts against the bottom of the circuit board on the feeding belt, the power motor operates, the second synchronous belt is tensioned and connected to the two second synchronous pulleys, driving the board-changing claw to slide along the surface of the support base, realizing the directional sliding of the board-changing claw on the surface of the support base.

[0014] Optionally, a suction cup is connected to the surface of the board-changing claw. The disk surface of the suction cup can adsorb on the surface of the circuit board to form a limit.

[0015] By adopting the above technical solution, when the top surface of the board-changing claw abuts against the bottom of the circuit board, the disk surface of the suction cup adsorbs on the board surface of the circuit board to form a limit, making the circuit board not easily shift on the board-changing claw, thereby improving the limit stability of the circuit board on the board-changing claw.

[0016] Optionally, a limiting bent plate is slidably connected to the board-changing claw. The sliding direction of the limiting bent plate is parallel to the conveying direction of the feeding belt. When the limiting bent plate slides towards the direction close to the suction cup, the plate surface of the limiting bent plate and the plate surface of the board-changing claw abut against both sides of the circuit board to form a limit.

[0017] By adopting the above technical solution, when the top surface of the board-changing claw abuts against the bottom of the circuit board, the limiting bent plate is driven to slide towards the direction close to the suction cup. The plate surface of the limiting bent plate and the plate surface of the board-changing claw abut against both sides of the circuit board to form a limit, making the circuit board not easily break away from the board-changing claw, and further improving the limit stability of the circuit board on the board-changing claw.

[0018] Optionally, a starting assembly is connected between the limiting bent plate and the support base. The starting assembly includes a connecting rope and a first elastic member. One end of the connecting rope is connected to the surface of the support base, and the other end of the connecting rope is connected to the surface of the limiting bent plate. One end of the first elastic member in the direction of the elastic force is connected to the plate surface of the limiting bent plate, and the other end of the first elastic member in the direction of the elastic force is connected to the plate surface of the board-changing claw. The first elastic member has an elastic force to drive the board-changing claw to slide away from the suction cup. When the board-changing claw slides along the support base away from the base, the connecting rope drives the limiting bent plate to slide towards the direction close to the suction cup, and the plate surface of the limiting bent plate and the plate surface of the board-changing claw abut against both sides of the circuit board to form a limit.

[0019] By adopting the above technical solution, when the top of the circuit board replacement claw abuts against the bottom of the circuit board on the feeding belt, the circuit board replacement claw slides along the surface of the support base in a direction away from the base, lifting the circuit board off the surface of the feeding belt. The distance between the limiting bent plate and the support base increases, the connecting rope overcomes the elastic force of the first elastic member and drives the limiting bent plate to slide in a direction close to the suction cup. The surfaces of the limiting bent plate and the circuit board replacement claw abut against both sides of the circuit board to form a limit, and the connecting rope is in a taut state. When the circuit board replacement claw slides in a direction close to the adjacent feeding belt and is directly above the feeding belt, the circuit board replacement claw slides along the surface of the support base in a direction close to the feeding belt. The distance between the limiting bent plate and the support base decreases, the connecting rope is in a slack state, and the elastic force of the first elastic member drives the limiting bent plate to slide in a direction away from the suction cup. The surface of the limiting bent plate disengages from the surface of the circuit board, causing the limiting effect of the limiting bent plate on the circuit board to disappear. The bottom of the circuit board abuts against the surface of the feeding belt, realizing the interchange of the circuit boards on the two feeding belts.

[0020] Optionally, an extrusion assembly is connected between the limiting bent plate and the suction cup. The extrusion assembly includes an extrusion bar, a ball, and a second elastic member. The end of the extrusion bar is connected to the surface of the limiting bent plate facing the suction cup. A sliding cavity for the extrusion bar to slide is formed on the surface of the circuit board replacement claw. A deformation cavity for accommodating the suction cup is formed on the surface of the circuit board replacement claw. The deformation cavity communicates with the sliding cavity. The ball is rotatably connected to the bottom of the suction cup. One end of the second elastic member in the direction of the elastic force is connected to the inner wall of the deformation cavity, and the other end of the second elastic member in the direction of the elastic force is connected to the surface of the ball. The second elastic member has an elastic force to drive the ball to slide in a direction close to the sliding cavity. The end of the ball protrudes from the inner wall of the sliding cavity, and the surface of the suction cup contracts and resumes in a direction close to the deformation cavity. When the extrusion bar slides along the sliding cavity in a direction close to the deformation cavity, the surface of the extrusion bar rolls in contact with the spherical surface of the ball. The extrusion bar drives the ball to slide in a direction close to the deformation cavity. The surface of the suction cup is deformed by the extrusion of the ball and adsorbs on the surface of the circuit board to form a limit.

[0021] By adopting the above technical solution, when the limiting bent plate slides in a direction close to the circuit board, the end of the extrusion bar is connected to the surface of the limiting bent plate. The limiting bent plate drives the extrusion bar to slide in a direction close to the deformation cavity. The surface of the extrusion bar rolls in contact with the ball. The spherical surface of the ball guides the ball to slide in a direction close to the deformation cavity. The surface of the suction cup is deformed by the extrusion of the ball and adsorbs on the surface of the circuit board, increasing the pressing force between the surface of the suction cup and the surface of the circuit board. When the interchange of the circuit boards on the two feeding belts is completed, the limiting bent plate slides in a direction away from the circuit board, driving the extrusion bar to slide in a direction away from the deformation cavity. The pressure of the extrusion bar on the ball disappears, and the elastic force of the second elastic member drives the ball to slide in a direction close to the sliding cavity. The end of the ball protrudes from the inner wall of the sliding cavity, and the surface of the suction cup contracts and resumes in a direction close to the deformation cavity, causing the adsorption force of the suction cup on the circuit board to disappear, realizing the directional adsorption between the suction cup and the circuit board.

[0022] Optionally, the extrusion assembly further includes a pressure block. A pressure cavity for the pressure block to slide is formed in the inner wall of the deformation cavity. The pressure cavity communicates with the sliding cavity. The end of the pressure block protruding from the sliding cavity is provided with a guiding surface, which is in a circular arc convex shape. The guiding surface can abut against the extrusion strip and guide the pressure block to slide towards the deformation cavity. Moreover, the end of the pressure block protruding from the deformation cavity presses the surface of the suction cup, driving the surface of the suction cup to deform and adsorb the circuit board surface to form a limit.

[0023] By adopting the above technical solution, when the extrusion strip slides towards the suction cup, the guiding surface abuts against the surface of the extrusion strip and guides the pressure block to slide towards the deformation cavity. The end of the pressure block protruding from the deformation cavity presses the surface of the suction cup, driving the surface of the suction cup to deform and adsorb the circuit board surface to form a limit, further improving the pressing force between the suction cup and the circuit board.

[0024] In a second aspect, a circuit board processing method provided by the present application adopts the following technical solution: The circuit board processing method uses a high-precision screen printing device for circuit boards and includes the following steps: Loading the circuit boards, placing two circuit boards at intervals on the surface of the conveyor belt at the loading station of one of the screen printing machine bodies; Processing one of the circuit boards, the rotating part drives the conveyor belt at the loading station to move to the processing station, and the processing part performs screen printing on one of the circuit boards at the processing station; Unloading the circuit boards, the conveyor belt drives the conveyor belt at the processing station to move to the unloading station, and the conveyor belt at the unloading station rotates in the reverse direction to drive the two circuit boards to enter the two feeding belts one by one; Exchanging the positions of the circuit boards, the exchanging component exchanges the positions of the circuit boards on the two feeding belts. The feeding belts drive the circuit boards to enter the surface of the discharging belt one by one, and the discharging belt drives the circuit boards to enter the surface of the conveyor belt at the loading station of another screen printing machine body; Processing the other circuit board, the rotating part drives the conveyor belt at the loading station to move to the processing station, and the processing part performs screen printing on the other circuit board at the processing station; Unloading the circuit boards, the conveyor belt drives the conveyor belt at the processing station to move to the unloading station, and the conveyor belt at the unloading station rotates in the reverse direction to drive the two circuit boards to be unloaded one by one.

[0025] By adopting the above technical solution, the exchange component exchanges the circuit boards on the two feeding belts, so that the positions of the circuit boards are consistent with the processing ends of the processing unit, ensuring the accuracy of the circuit boards during subsequent printing, enabling the printing device to receive at least two circuit boards at a time, improving the feeding and processing efficiency of the circuit boards, and when adding a printing device to an integrated production line, only an exchange device needs to be added, reducing the transformation of other equipment on the production line and the floor area occupied by the transformation, thereby reducing the processing cost of the circuit boards.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The setting of the exchange component enables the printing device to receive at least two circuit boards at a time, improving the feeding and processing efficiency of the circuit boards, and when adding a printing device to a production line, only an exchange device needs to be added, reducing the transformation of other equipment on the production line and the floor area occupied by the transformation, thereby reducing the processing cost of the circuit boards; 2. The setting of the board-changing claws, guide rails and support seats. The board-changing claws slide along the surface of the support seat towards the direction close to the feeding belt, and the bottom of the circuit board abuts against the surface of the feeding belt, realizing the position exchange between the processed circuit board and the unprocessed circuit board; 3. The setting of the first synchronous pulley and the first synchronous belt drives the support seat to slide reversely along the surface of the guide rail. There is no need to install a power device for each support seat to drive, reducing energy loss, thereby reflecting the concept of energy conservation. Description of the Drawings

[0027] Figure 1 is the overall structural schematic diagram in the embodiment of the present application.

[0028] Figure 2 is the partial structural schematic diagram of the exchange device in the embodiment of the present application.

[0029] Figure 3 is the partial sectional view of the exchange device in the embodiment of the present application, mainly showing the starting component.

[0030] Figure 4 is Figure 3 the enlarged view of part A in

[0031] Description of the reference numerals: 1. Exchange device; 11. Base; 12. Exchange component; 121. Plate-changing claw; 1211. Limit flow channel; 1212. Avoidance cavity; 1213. Sliding cavity; 1214. Pressure cavity; 1215. Deformation cavity; 122. Guide rail; 123. Support base; 124. First synchronous pulley; 125. First synchronous belt; 13. Feeding belt; 14. Discharging belt; 2. Screen printer body; 21. Processing part; 22. Rotating part; 23. Conveyor belt; 3. Circuit board; 4. Power component; 41. Power motor; 42. Second synchronous pulley; 43. Second synchronous belt; 5. Limit bent plate; 6. Roller; 7. Starting component; 71. Connecting rope; 72. First elastic part; 8. Suction cup; 9. Extrusion component; 91. Extrusion bar; 92. Ball; 93. Second elastic part; 94. Pressure block; 941. Guide surface. Detailed implementation manners

[0032] The following further elaborates on this application in conjunction with the attached Figures 1-4 drawings.

[0033] An embodiment of this application discloses a high-precision screen printing device for circuit boards. Referring to Figure 1 and Figure 2 , the high-precision screen printing device for circuit boards includes an exchange device 1 and at least two screen printer bodies 2. The exchange device 1 is installed between the two screen printer bodies 2. One of the screen printer bodies 2 performs screen printing on one of the two circuit boards 3 and conveys the two circuit boards 3 to the exchange device 1. The exchange device 1 interchanges the positions of the two circuit boards 3 and then conveys them to the other screen printer body 2, so that the positions of the circuit boards 3 are consistent with the processing ends of the screen printer bodies 2, thereby ensuring the accuracy of the subsequent printing of the circuit boards 3. The other screen printer body 2 performs screen printing and blanking on the other of the two circuit boards 3, enabling the printing device to process at least two circuit boards 3 at a time, improving the feeding and processing efficiency of the circuit boards 3. Moreover, when adding a printing device to a production line, only the exchange device 1 needs to be added, reducing the transformation of other equipment on the production line and the floor area occupied by the transformation, thereby reducing the processing cost of the circuit boards 3.

[0034] Referring to Figure 1 and Figure 2, the screen printing machine body 2 includes a processing part 21, a rotating part 22 and a plurality of conveyor belts 23. The bottom of the processing part 21 abuts against the ground to form a support. The rotating part 22 is rotatably connected to the surface of the processing part 21. The rotation axis of the rotating part 22 is parallel to the height direction of the processing part 21. The number of conveyor belts 23 can be two, four or more. In the embodiment of the present application, the number of conveyor belts 23 is four. The four conveyor belts 23 are evenly installed on the surface of the rotating part 22 at intervals around the axis of the rotating part 22. A plurality of negative pressure adsorption devices are installed on the rotating part 22 at intervals around the axis of the rotating part 22. The negative pressure adsorption devices correspond to the conveyor belts 23 one by one. When the negative pressure adsorption devices are started, they can adsorb and fix the circuit board 3 on the surface of the conveyor belt 23, realizing the positioning of the circuit board 3 on the conveyor belt 23.

[0035] Refer to Figure 1 and Figure 2 , the rotating part 22 is provided with a loading station, a processing station and an unloading station at intervals around the axis of the rotating part 22. The rotation of the rotating part 22 drives each conveyor belt 23 to pass through the loading station, the processing station and the unloading station in turn; Two circuit boards 3 are placed at intervals on the surface of the conveyor belt 23 located at the loading station. The rotation of the rotating part 22 drives the conveyor belt 23 at the loading station to move to the processing station. The processing part 21 performs screen printing on one of the circuit boards 3 at the processing station. The rotation of the rotating part 22 drives the conveyor belt 23 at the processing station to move to the unloading station. The conveyor belt 23 at the unloading station rotates reversely to drive the circuit board 3 into the exchange device 1, realizing the high-precision screen printing of one of the circuit boards 3.

[0036] Refer to Figure 1 and Figure 2 , the exchange device 1 includes a base 11, an exchange component 12, at least two feeding belts 13 and at least two discharging belts 14. The bottom of the base 11 abuts against the ground to form a support. In the embodiment of the present application, the number of the feeding belts 13 and the discharging belts 14 is two. The two feeding belts 13 are installed on the top surface of the base 11 at intervals. The two feeding belts 13 correspond to the two circuit boards 3 on the unloading station of one of the screen printing machine bodies 2 one by one. The conveyor belt 23 at the unloading station rotates reversely and conveys the circuit boards 3 to the surface of the feeding belts 13 one by one. The two discharging belts 14 are installed on the top surface of the base 11 at intervals. The feeding belts 13 correspond to the discharging belts 14 one by one. The exchange component 12 is connected to the top surface of the base 11. The exchange component 12 is located between the feeding belts 13 and the discharging belts 14. The exchange component 12 exchanges the circuit boards 3 on the two feeding belts 13. The other end of the discharging belt 14 away from the feeding belt 13 faces the feeding station on another screen printing machine body 2.

[0037] Refer to Figure 1 and Figure 2, when the swapping component 12 finishes swapping the circuit boards 3 on the two feeding belts 13, the feeding belt 13 drives the circuit board 3 to be conveyed onto the surface of the discharging belt 14, and the discharging belt 14 drives the circuit board 3 to be conveyed onto the surface of the conveyor belt 23 at the feeding station of another screen printing machine body 2. The rotating part 22 rotates to drive the conveyor belt 23 at the feeding station to move to the processing station, and the processing part 21 performs screen printing on another circuit board 3 at the processing station. The rotating part 22 drives the conveyor belt 23 at the processing station to move to the discharging station, and the conveyor belt 23 at the discharging station rotates in the reverse direction to drive the two circuit boards 3 on the conveyor belt 23 to be discharged. This enables the printing device to receive at least two circuit boards 3 at a time, improving the feeding and processing efficiency of the circuit boards 3. Moreover, when adding a printing device to a production line, only the swapping device 1 needs to be added, reducing the modification of other equipment on the production line and the floor area occupied by the modification, thereby reducing the processing cost of the circuit boards 3.

[0038] Refer to Figure 1 and Figure 2 , the swapping component 12 includes at least two board swapping claws 121, at least two guide rails 122, at least two support seats 123, at least two first synchronous pulleys 124, and a first synchronous belt 125 used in cooperation with the first synchronous pulleys 124. In the embodiment of the present application, the numbers of the board swapping claws 121, guide rails 122, support seats 123, and the first synchronous pulleys 124 are all two. The two guide rails 122 are fixedly spaced on the surface of the base 11, and the length direction of the guide rails 122 is parallel to the arrangement direction of the feeding belts 13. The support seats 123 are in one-to-one correspondence with the guide rails 122 and are slidably connected to the surface of the guide rails 122. The two first synchronous pulleys 124 are rotatably connected to the top surface of the base 11 at intervals, and the two first synchronous pulleys 124 are located at both ends in the length direction of the guide rails 122. The first synchronous belt 125 is tensioned and connected to the two first synchronous pulleys 124, and the two support seats 123 are respectively installed on both sides of the first synchronous belt 125. When the two first synchronous pulleys 124 rotate on the top surface of the base 11, they drive the two support seats 123 to slide in the opposite direction along the surface of the guide rails 122 towards the adjacent feeding belt 13.

[0039] Refer to Figure 1 and Figure 2, the board-changing claws 121 correspond to the support seats 123 one by one and are slidably connected to the surface of the support seats 123. The sliding direction of the board-changing claws 121 is parallel to the height direction of the base 11. The support seats 123 are equipped with a power assembly 4, and the power assembly 4 can drive the board-changing claws 121 to slide on the surface of the support seats 123. The power assembly 4 includes a power motor 41, two second synchronous pulleys 42, and a second synchronous belt 43 used in conjunction with the second synchronous pulleys 42. The power motor 41 is fixed to the surface of the support seat 123 by bolts. The axis of the power motor 41 is parallel to the conveying direction of the feeding belt 13. One of the second synchronous pulleys 42 is coaxially fixed to the motor shaft of the power motor 41, and the other second synchronous pulley 42 is rotatably connected to the surface of the support seat 123. The second synchronous belt 43 is tensioned and connected to the two second synchronous pulleys 42. The end of the board-changing claw 121 is installed on the surface of the second synchronous belt 43.

[0040] Refer to Figure 1 and Figure 2 , when the board-changing claws 121 correspond to the circuit boards 3 on the feeding belt 13 one by one and abut against the bottom of the circuit boards 3, the power motor 41 operates to drive the board-changing claws 121 to slide along the surface of the support seats 123 in a direction away from the base 11. The top surface of the board-changing claws 121 lifts the circuit boards 3 off the surface of the feeding belt 13. The height of the circuit board 3 lifted by one of the board-changing claws 121 is higher than the height of the circuit board 3 lifted by the other board-changing claw 121. The first synchronous pulley 124 rotates to drive the support seat 123 to slide along the surface of the guide rail 122 in a direction close to the adjacent feeding belt 13, driving the board-changing claws 121 to slide in a direction close to the adjacent feeding belt 13. The board-changing claws 121 are located directly above the feeding belt 13. The power motor 41 runs in the reverse direction to drive the board-changing claws 121 to slide along the surface of the support seats 123 in a direction close to the base 11. The bottom of the circuit board 3 on the board-changing claws 121 abuts against the surface of the feeding belt 13, realizing the position exchange of the circuit boards 3 on the two feeding belts 13.

[0041] Refer to Figure 2 and Figure 3 , the top surface of the board-changing claw 121 is slidably connected with a limiting bent plate 5. The sliding direction of the limiting bent plate 5 is parallel to the conveying direction of the feeding belt 13. The top surface of the board-changing claw 121 is provided with a limiting flow channel 1211 for the limiting bent plate 5 to slide. When the limiting bent plate 5 slides along the inner wall of the limiting flow channel 1211 in a direction close to the suction cup 8, the plate surface of the limiting bent plate 5 abuts against both sides of the circuit board 3 with the plate surface of the board-changing claw 121 to form a limit, making the circuit board 3 not easily shift on the board-changing claw 121, thereby improving the limiting stability of the circuit board 3 on the board-changing claw 121.

[0042] Refer to Figure 2 and Figure 3, a roller 6 is rotatably connected to the surface of the limiting bent plate 5 facing the bottom wall of the limiting flow channel 1211. The rolling surface of the roller 6 is in rolling contact with the bottom wall of the limiting flow channel 1211. Rolling friction replaces sliding friction, reducing the wear of the high-precision screen printing equipment for circuit boards, thereby extending the service life of the high-precision screen printing equipment for circuit boards. A starting component 7 is installed between the limiting bent plate 5 and the support base 123. The starting component 7 can control the sliding of the limiting bent plate 5. The starting component 7 includes a connecting rope 71 and a first elastic member 72. An avoidance cavity 1212 for the sliding of the connecting rope 71 is formed in the bottom wall of the limiting flow channel 1211. The avoidance cavity 1212 penetrates through the bottom wall of the plate-changing claw 121 along the depth direction. One end of the connecting rope 71 is fixed to the bottom of the limiting bent plate 5, and the other end of the connecting rope 71 is fixed to the top surface of the support base 123. The first elastic member 72 can be a compression spring or a tension spring. In the embodiment of the present application, the first elastic member 72 is a compression spring and has a certain deformation ability.

[0043] Refer to Figure 2 and Figure 3 , one end of the first elastic member 72 in the direction of the elastic force is fixed to the inner wall of the limiting flow channel 1211, and the other end of the first elastic member 72 in the direction of the elastic force is fixed to the plate surface of the limiting bent plate 5. The elastic member has an elastic force to drive the limiting bent plate 5 to slide away from the circuit board 3, and there is a tendency for the plate surface of the limiting bent plate 5 to separate from the plate surface of the circuit board 3; when the plate-changing claw 121 slides along the surface of the support base 123 away from the base 11, the plate-changing claw 121 lifts the circuit board 3 off the surface of the feeding belt 13, and the distance between the limiting bent plate 5 and the support base 123 increases. The limiting bent plate 5 slides along the inner wall of the limiting flow channel 1211 towards the circuit board 3 under the tension of the connecting rope 71. The plate surfaces of the limiting bent plate 5 and the plate-changing claw 121 abut against both sides of the circuit board 3 to form a limit. When the plate-changing claw 121 slides along the surface of the support base 123 towards the base 11, the plate-changing claw 121 lifts the circuit board 3 close to the surface of the feeding belt 13, and the distance between the limiting bent plate 5 and the support base 123 decreases. The tension of the connecting rope 71 on the limiting bent plate 5 disappears. The elastic force of the first elastic member 72 drives the limiting bent plate 5 to slide away from the circuit board 3, and the plate surface of the limiting bent plate 5 separates from the plate surface of the circuit board 3, so that the limiting effect of the limiting bent plate 5 on the circuit board 3 disappears, and the bottom of the circuit board 3 abuts against the surface of the feeding belt 13, realizing the stability of the interchange of the circuit boards 3 on the two feeding belts 13.

[0044] Refer to Figure 3 and Figure 4, a suction cup 8 is mounted on the surface of the circuit board 3 facing the board-changing claw 121. The material of the suction cup 8 can be rubber or silica gel. In the embodiment of the present application, the material of the suction cup 8 is rubber, which has a certain deformation ability. A deformation cavity 1215 for the deformation of the suction cup 8 is provided on the surface of the board-changing claw 121 facing the circuit board 3. The suction cup 8 can adsorb on the board surface of the circuit board 3 to form a limit, so that the circuit board 3 is not easily separated from the board-changing claw 121, thereby improving the limit stability of the circuit board 3 on the board-changing claw 121.

[0045] Referring to Figure 3 and Figure 4 , an extrusion assembly 9 is installed between the limit bending plate 5 and the suction cup 8. The extrusion assembly 9 can extrude the suction cup 8 to deform and adsorb and fix on the board surface of the circuit board 3 to form a positioning. The extrusion assembly 9 includes an extrusion bar 91, a ball 92, an elastic member II 93 and a pressure block 94. The end of the extrusion bar 91 is integrally formed and fixed on the surface of the limit bending plate 5 facing the suction cup 8. A sliding cavity 1213 for the extrusion bar 91 to slide is provided on the inner wall of the limit flow channel 1211. The sliding cavity 1213 communicates with the deformation cavity 1215. The ball 92 is rotatably connected to the bottom of the suction cup 8 facing the sliding cavity 1213. The elastic member II 93 can be a compression spring or a torsion spring. In the embodiment of the present application, the elastic member II 93 is a compression spring, which has a certain deformation ability. One end in the elastic force direction of the elastic member II 93 is fixed on the inner wall of the deformation cavity 1215, and the other end in the elastic force direction of the elastic member II 93 abuts against the surface of the ball 92. The elastic member II 93 has an elastic force to drive the ball 92 to slide towards the direction close to the sliding cavity 1213. The end of the ball 92 protrudes from the inner wall of the sliding cavity 1213, and the suction cup 8 surface contracts and deforms and restores towards the direction close to the deformation cavity 1215.

[0046] Referring to Figure 3 and Figure 4 , a pressure cavity 1214 for the pressure block 94 to slide is provided at the bottom of the deformation cavity 1215. The pressure cavity 1214 penetrates through the inner wall of the deformation cavity 1215 in the depth direction and communicates with the sliding cavity 1213. The pressure block 94 is located on the side of the ball 92 close to the extrusion bar 91. A guiding surface 941 is provided at the end of the pressure block 94 protruding from the sliding cavity 1213. The guiding surface 941 is in a circular arc convex shape. The guiding surface 941 can abut against the surface of the extrusion bar 91 and guide the pressure block 94 to slide towards the direction close to the suction cup 8. The end of the pressure block 94 protruding from the deformation cavity 1215 presses the surface of the suction cup 8. The surface of the suction cup 8 is deformed by pressure and adsorbs on the board surface of the circuit board 3 to form a limit.

[0047] Referring to Figure 3 and Figure 4, when the limit bent plate 5 slides along the inner wall of the limit flow channel 1211 towards the direction close to the circuit board 3, it drives the extrusion strip 91 to slide along the inner wall of the sliding cavity 1213 towards the direction close to the deformation cavity 1215. The guiding surface 941 abuts against the surface of the extrusion strip 91 and guides the pressure block 94 to slide towards the direction close to the suction cup 8. The end of the pressure block 94 protruding from the deformation cavity 1215 presses the surface of the suction cup 8. The surface of the suction cup 8 is deformed under pressure and adsorbs on the surface of the circuit board 3 to form a limit. The extrusion strip 91 continues to slide along the inner wall of the sliding cavity 1213 towards the direction close to the ball 92. The surface of the extrusion strip 91 makes rolling contact with the spherical surface of the ball 92. The extrusion strip 91 drives the ball 92 to slide towards the direction close to the deformation cavity 1215. The disk surface of the suction cup 8 is deformed by the extrusion of the ball 92 and adsorbs on the surface of the circuit board 3 to form a limit, making the circuit board 3 not easily separated from the board-changing claw 121 when the board-changing claw 121 transports the circuit board 3, thereby improving the stability of the board-changing claw 121 in transporting the circuit board 3.

[0048] The implementation principle of a high-precision screen printing device for circuit boards in an embodiment of the present application is as follows: Two circuit boards 3 are placed at intervals on the surface of the conveyor belt 23 at the loading station. The rotating part 22 rotates to drive the conveyor belt 23 at the loading station to move to the processing station. The processing part 21 performs screen printing on one of the circuit boards 3 at the processing station. The rotating part 22 rotates to drive the conveyor belt 23 at the processing station to move to the unloading station. The conveyor belt 23 at the unloading station rotates in the reverse direction to drive the circuit board 3 into the exchange device 1, realizing high-precision screen printing of one of the circuit boards 3. At the same time, the conveyor belt 23 at the unloading station rotates in the reverse direction and conveys the circuit boards 3 to the surface of the feeding belt 13 one by one in correspondence. The exchange assembly 12 completes the interchange of the circuit boards 3 on the two feeding belts 13. The feeding belt 13 drives the circuit board 3 to be conveyed to the surface of the discharging belt 14. The discharging belt 14 drives the circuit board 3 to be conveyed to the surface of the conveyor belt 23 at the feeding station of another screen printing machine body 2. The rotating part 22 rotates to drive the conveyor belt 23 at the feeding station to move to the processing station. The processing part 21 performs screen printing on the other circuit board 3 at the processing station. The rotating part 22 drives the conveyor belt 23 at the processing station to move to the unloading station. The conveyor belt 23 at the unloading station rotates in the reverse direction to drive the two circuit boards 3 on the conveyor belt 23 to be unloaded, realizing that the printing device can enter at least two circuit boards 3 at a time, improving the feeding and processing efficiency of the circuit boards 3, and only adding the exchange device 1 when adding a printing device to a production line, reducing the transformation of other equipment on the production line, reducing the floor area of the transformation, and thus reducing the processing cost of the circuit boards 3.

[0049] An embodiment of the present application also discloses a circuit board processing method, which uses a high-precision screen printing device for circuit boards and includes the following steps: Loading the circuit board 3, placing two circuit boards 3 at intervals on the surface of the conveyor belt 23 at the loading station of one of the screen printing machine bodies 2; One of the circuit boards 3 is processed. The rotating part 22 drives the conveyor belt 23 at the loading station to move to the processing station, and the processing part 21 performs screen printing on one of the circuit boards 3 at the processing station; The circuit board 3 is unloaded. The conveyor belt 23 drives the conveyor belt 23 at the processing station to move to the unloading station, and the conveyor belt 23 at the unloading station rotates in the reverse direction to drive the two circuit boards 3 to enter the two feeding belts 13 one by one; The positions of the circuit boards 3 are exchanged. The exchange component 12 exchanges the positions of the circuit boards 3 on the two feeding belts 13. The feeding belts 13 drive the circuit boards 3 to enter the surface of the discharging belt 14 one by one, and the discharging belt 14 drives the circuit boards 3 to enter the surface of the conveyor belt 23 at the loading station of another screen printing machine body 2; Another circuit board 3 is processed. The rotating part 22 drives the conveyor belt 23 at the loading station to move to the processing station, and the processing part 21 performs screen printing on another circuit board 3 at the processing station; The circuit board 3 is unloaded. The conveyor belt 23 drives the conveyor belt 23 at the processing station to move to the unloading station, and the conveyor belt 23 at the unloading station rotates in the reverse direction to drive the two circuit boards 3 to be unloaded one by one.

[0050] The implementation principle of a circuit board processing method according to an embodiment of the present application is as follows: The exchange component 12 exchanges the circuit boards 3 on the two feeding belts 13 to make the positions of the circuit boards 3 consistent with the processing ends of the processing part 21, ensuring the accuracy of the circuit boards 3 during subsequent printing, enabling at least two circuit boards 3 to enter the printing equipment at one time, improving the feeding and processing efficiency of the circuit boards 3, and when adding a printing device to an integrated production line, only the exchange device 1 needs to be added, reducing the transformation of other equipment on the production line and the floor area of the transformation, thereby reducing the processing cost of the circuit boards 3.

[0051] The above are all preferred embodiments of the present application. The protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. High-precision screen printing equipment for circuit boards, characterized by: The invention comprises a switching device (1) and at least two screen printing machine bodies (2), wherein the switching device (1) is located between the two screen printing machine bodies (2), wherein the screen printing machine bodies (2) comprise a processing portion (21), a rotating portion (22) and a plurality of conveyor belts (23), wherein the rotating portion (22) is rotatably connected to the surface of the processing portion (21), and the plurality of conveyor belts (23) are connected to the surface of the rotating portion (22) at intervals around the axis of the rotating portion (22), and the surface of the conveyor belt (23) is provided with at least two circuit boards ( 3) placement, the rotating part (22) is provided with a loading station, a processing station and a unloading station at intervals around the axis of the rotating part (22), the rotating part (22) rotates to drive each conveyor belt (23) to pass through the loading station, the processing station and the unloading station in sequence, the conveyor belt (23) located at the loading station is used for loading and placing at least two circuit boards (3), the processing part (21) can perform screen printing on one of the circuit boards (3) on the processing station, and the conveyor belt (23) located at the unloading station The two circuit boards (3) are driven to approach the exchange device (1) by reversing. The exchange device (1) comprises a base (11), an exchange component (12), at least two feed belts (13) and at least two discharge belts (14). At least two of the feed belts (13) are connected to the base (11) at intervals. The feed belts (13) correspond one-to-one with the circuit boards (3) on the unloading station. The exchange component (12) is connected to the base (11). The exchange component (12) can exchange the circuit boards (3) of the two feed belts (13). At least two of the discharge belts (14) are connected to the base (11) at intervals. The discharge belts (14) correspond one-to-one with the feed belts (13). The feed belts (13) drive the circuit boards (3) to enter the surface of the discharge belts (14). The discharge belts (14) drive the circuit boards (3) to be transferred to another screen printing machine body (2). The processing unit (21) performs screen printing on another circuit board (3) at the processing station.

2. The high-precision screen printing device for circuit boards according to claim 1, characterized in that: The exchange component (12) comprises at least two plate-changing claws (121), at least two guide rails (122) and at least two support seats (123), at least two of the guide rails (122) are connected to the surface of the base (11) at intervals, the length direction of the guide rails (122) and the arrangement direction of the feed belt (13) are parallel to each other, the support seat (123) corresponds to the guide rails (122) one by one and is slidably connected to the surface of the guide rails (122), the plate-changing claws (121) correspond to the support seats (123) one by one and are slidably connected to the surface of the support seats (123), the sliding direction of the plate-changing claws (121) and the height direction of the base (11) are parallel to each other, and when the plate-changing claws (121) and the circuit board of the feed belt (13) are aligned, the plate-changing claws (121) and the circuit board of the feed belt (13) are aligned. (3) When they correspond to each other and abut against each other, the plate changing claw (121) slides along the surface of the support seat (123) in a direction away from the feed belt (13), and the plate changing claw (121) lifts the circuit board (3) off the surface of the feed belt (13), one of the plate changing claws (121) is higher than the other plate changing claw (121), and at least two of the support seats (123) slide along the surface of the guide rail (122) in a direction close to the adjacent feed belt (13), driving the plate changing claw (121) to move in the direction of the adjacent feed belt (13), and the plate changing claw (121) slides along the surface of the support seat (123) in a direction close to the feed belt (13), and the circuit board (3) is placed on the surface of the feed belt (13).

3. The high-precision screen printing device for circuit boards according to claim 2, characterized in that: The exchange component (12) further comprises at least two synchronous wheels (124) and a synchronous belt (125) used in conjunction with the synchronous wheel (124); at least two synchronous wheels (124) are connected to the surface of the base (11) in a rotationally spaced manner; at least two synchronous wheels (124) are located at both ends of the length of the guide rail (122); the synchronous belt (125) is tensioned to connect the two synchronous wheels (124); at least two support seats (123) are connected to both sides of the synchronous belt (125) in a one-to-one correspondence; when the synchronous wheel (124) rotates, the two support seats (123) are driven to slide in the opposite direction along the surface of the guide rail (122).

4. The high-precision screen printing device for circuit boards according to claim 2, characterized in that: The support seat (123) is connected to a power assembly (4), the power assembly (4) comprising a power motor (41), at least two synchronous wheels (42) and a synchronous belt (43) used in conjunction with the synchronous wheels (42), the power motor (41) being connected to the surface of the support seat (123), the motor axis of the power motor (41) and the transmission direction of the feed belt (13) being parallel to each other, one of the synchronous wheels (42) being coaxially connected to the motor shaft of the power motor (41), the other synchronous wheel (42) being rotatably connected to the surface of the support seat (123), the synchronous belt (43) being tensioned to connect the two synchronous wheels (42), the plate changing claw (121) being connected to the surface of the synchronous belt (43), and when the power motor (41) is running, the plate changing claw (121) is driven to slide along the surface of the support seat (123).

5. The high-precision screen printing device for circuit boards according to claim 4, characterized in that: The surface of the board-changing claw (121) is connected to a suction cup (8), and the surface of the suction cup (8) can be adsorbed on the surface of the circuit board (3) to form a limit position.

6. The high-precision screen printing device for circuit boards according to claim 5, characterized in that: The plate changing claw (121) is slidably connected to the limit bending plate (5), and the sliding direction of the limit bending plate (5) and the conveying direction of the feed belt (13) are parallel to each other. When the limit bending plate (5) slides in a direction close to the suction cup (8), the plate surface of the limit bending plate (5) and the plate surface of the plate changing claw (121) abut against both sides of the circuit board (3) to form a limit.

7. The high-precision screen printing device for circuit boards according to claim 6, characterized in that: A starting assembly (7) is connected between the limit bending plate (5) and the support seat (123), and the starting assembly (7) comprises a connecting rope (71) and an elastic member (72), one end of the connecting rope (71) is connected to the surface of the support seat (123), the other end of the connecting rope (71) is connected to the surface of the limit bending plate (5), one end of the elastic member (72) in the elastic force direction is connected to the plate surface of the limit bending plate (5), and the other end of the elastic member (72) in the elastic force direction is connected to the plate surface of the limit bending plate (5). Connected to the plate surface of the plate changing claw (121), the elastic member (72) has an elastic force that drives the plate changing claw (121) to slide in a direction away from the suction cup (8). When the plate changing claw (121) slides along the support seat (123) in a direction away from the base (11), the connecting rope (71) drives the limit bending plate (5) to slide in a direction close to the suction cup (8), and the plate surface of the limit bending plate (5) and the plate surface of the plate changing claw (121) abut against both sides of the circuit board (3) to form a limit.

8. The high-precision screen printing device for circuit boards according to claim 7, characterized in that: An extrusion assembly (9) is connected between the limit bending plate (5) and the suction cup (8), the extrusion assembly (9) comprising an extrusion strip (91), a ball bearing (92) and an elastic member 2 (93), the end of the extrusion strip (91) being connected to the surface of the limit bending plate (5) facing the suction cup (8), the plate surface of the plate changing claw (121) being provided with a sliding cavity (1213) for sliding the extrusion strip (91), the plate surface of the plate changing claw (121) being provided with a deformation cavity (1215) for accommodating the suction cup (8), the deformation cavity (1215) being connected to the sliding cavity (1213), the ball bearing (92) being rotatably connected to the bottom of the suction cup (8), one end of the elastic member 2 (93) in the elastic force direction being connected to the inner wall of the deformation cavity (1215), the elastic member 2 (93) The other end in the direction of the elastic force is connected to the surface of the ball (92), and the second elastic member (93) has an elastic force that drives the ball (92) to slide in a direction close to the sliding cavity (1213). The end of the ball (92) protrudes from the inner wall of the sliding cavity (1213), and the surface of the suction cup (8) shrinks and recovers in a direction close to the deformation cavity (1215). When the extrusion strip (91) slides along the sliding cavity (1213) in a direction close to the deformation cavity (1215), the surface of the extrusion strip (91) rolls with the spherical surface of the ball (92), and the extrusion strip (91) drives the ball (92) to slide in a direction close to the deformation cavity (1215). The surface of the suction cup (8) is deformed by the extrusion of the ball (92) and is adsorbed on the surface of the circuit board (3) to form a limit.

9. The high-precision screen printing device for circuit boards according to claim 8, characterized in that: The extrusion assembly (9) further comprises a pressure block (94); an inner wall of the deformation cavity (1215) is provided with a pressure cavity (1214) for the pressure block (94) to slide; the pressure cavity (1214) is connected to the sliding cavity (1213); an end of the pressure block (94) protruding from the sliding cavity (1213) is provided with a guide surface (941); the guide surface (941) is in the shape of a circular arc protrusion; the guide surface (941) can abut against the extrusion strip (91) and guide the pressure block (94) to slide in a direction close to the deformation cavity (1215); and the end of the pressure block (94) protruding from the deformation cavity (1215) presses the surface of the suction cup (8), driving the surface of the suction cup (8) to deform and adsorb the circuit board (3) to form a limit.

10. A circuit board processing method, characterized in that: The high-precision screen printing device for a circuit board according to any one of claims 1 to 9 is used, comprising the following steps: Loading the circuit boards (3), placing two circuit boards (3) at intervals on the surface of a conveyor belt (23) on one of the loading stations of the screen printing machine body (2); One of the circuit boards (3) is processed, the rotating part (22) drives the conveyor belt (23) on the loading station to move to the processing station, and the processing part (21) performs screen printing on one of the circuit boards (3) on the processing station; The circuit board (3) is unloaded, and the conveyor belt (23) drives the conveyor belt (23) of the processing station to move to the unloading station, and the conveyor belt (23) on the unloading station rotates in the opposite direction to drive the two circuit boards (3) to enter the two feeding belts (13) one by one; The positions of the circuit boards (3) are interchanged, and the exchange component (12) interchanges the positions of the circuit boards (3) on the two feeding belts (13), and the feeding belts (13) drive the circuit boards (3) to enter the surface of the discharging belt (14) one by one, and the discharging belt (14) drives the circuit boards (3) to enter the surface of the conveyor belt (23) on the loading station of another screen printing machine body (2); Another circuit board (3) is processed, the rotating part (22) drives the conveyor belt (23) on the loading station to move to the processing station, and the processing part (21) performs screen printing on another circuit board (3) on the processing station; The circuit boards (3) are unloaded, and the conveyor belt (23) drives the conveyor belt (23) of the processing station to move to the unloading station, and the conveyor belt (23) on the unloading station rotates in the opposite direction to drive the two circuit boards (3) to be unloaded one by one.

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