SMT printing jig

Abstract

The utility model relates to circuit board printing technical field, concretely relates to a kind of SMT printing jigs, including the printing layer and fixed layer of upper and lower arrangement, be equipped with suction area on printing layer, fixed layer is equipped with suction device, suction device is communicated suction area, to make the suction force that suction area can adsorb PCB board;It further includes clamping positioning assembly, two clamping positioning assemblies are set towards, to carry out clamping positioning to the PCB board located in suction area, clamping positioning assembly includes positioning block and drive arrangement, two positioning blocks are located at the top of printing layer, and it is arranged along the circumference of printing layer, two drive arrangements are respectively transmission connection each corresponding positioning block, to drive two positioning blocks mutually close or away. By setting clamping positioning assembly, when PCB board is not correctly placed in suction area, the drive arrangement in clamping positioning assembly can drive positioning to PCB board positioning, make it with correct attitude to place to suction area.

Description

Technical Field

[0001] This utility model relates to the field of circuit board printing technology, specifically to an SMT printing fixture. Background Technology

[0002] In the current electronics manufacturing industry, SMT printing process commonly uses stencil printing technology. The PCB is fixed on the worktable, and the solder paste is transferred to the PCB pads by printing on the stencil using a squeegee.

[0003] For example, Chinese utility model patent with publication number CN205546220U discloses an SMT vacuum printing fixture, which includes three parts: a printing layer, an intermediate layer, and a fixing layer; a fixing connection component is provided between the printing layer and the intermediate layer and between the intermediate layer and the fixing layer; multiple through vacuum holes are provided in the vacuum hole setting area preset on the upper surface of the printing layer; multiple air guide grooves are provided near the multiple vacuum holes; and an air intake is provided on one side of the fixing layer.

[0004] The aforementioned SMT vacuum printing fixture also has the following technical defects: when the PCB board is placed on the fixture, if the PCB board is not placed in the correct position, the operator usually needs to move and fine-tune the PCB board multiple times to confirm that the alignment is accurate before the vacuum adsorption and fixing process can be started, resulting in low work efficiency. Utility Model Content

[0005] In view of the above-mentioned technical problems in the existing technology, this utility model provides an SMT printing fixture.

[0006] To achieve the above objectives, this utility model provides the following technical solution: An SMT printing fixture is provided, comprising a printed layer and a fixing layer arranged vertically. The printed layer has an adsorption area, and the fixing layer has an air extraction device connected to the adsorption area to generate an adsorption force capable of adsorbing the PCB board. It also includes clamping and positioning components, with two clamping and positioning components arranged facing each other to clamp and position the PCB board located in the adsorption area. The clamping and positioning components include positioning blocks and driving devices. The two positioning blocks are located on the top of the printed layer and arranged circumferentially along the printed layer. The two driving devices are respectively connected to their respective positioning blocks to drive the two positioning blocks to move closer or further apart.

[0007] Preferably, the positioning block is L-shaped and includes a first limiting part disposed along the length direction of the printed layer and a second limiting part disposed along the width direction of the printed layer.

[0008] Preferably, the positioning block is slidably disposed on the top of the printing layer, and two slides are respectively provided at both ends of the top of the printing layer. The two slides are arranged along the width direction of the printing layer. The bottom of the second limiting part is provided with a slide groove that slides with the slides. The driving device is connected to the outer wall of the second limiting part in the positioning block.

[0009] Preferably, the driving device includes a mounting bracket, a drive motor, and a screw. The mounting bracket is fixed to the side wall of the fixed layer, and a threaded sleeve is rotatably provided on the mounting bracket. The screw passes through the threaded sleeve, and one end of the screw is fixedly connected to the outer side wall of the second limiting part. The drive motor is fixed to the mounting bracket and located below the threaded sleeve. The output end of the drive motor is fixedly connected to a drive gear, and a driven gear that meshes with the drive gear is provided on the threaded sleeve.

[0010] Preferably, the adsorption area is provided with multiple rows of suction holes arranged horizontally along the length of the printing plate, and each row of suction holes is provided with multiple suction holes arranged at intervals along the width of the printing plate.

[0011] Preferably, each suction hole has a suction nozzle at its bottom, and the top of the suction nozzle is fixedly connected to the bottom of the printed layer.

[0012] Preferably, the fixed layer is also equipped with multiple solenoid valves. The outlet of each solenoid valve is connected to the suction device through the main air pipe, and the inlet of each solenoid valve is connected to the bottom of the suction nozzle at the bottom of each suction hole in the corresponding column of suction holes through multiple branch air pipes. The solenoid valve can control the suction volume of multiple branch air pipes by adjusting its own valve opening, so that the suction holes at different positions in each column of suction holes generate different suction forces.

[0013] Preferably, multiple magnets are embedded at the bottom of the fixing layer for attaching the fixing layer to the printing press.

[0014] The beneficial effects of this utility model are: This utility model discloses an SMT printing fixture. By setting up a clamping and positioning component, when the PCB board is not correctly placed in the adsorption area, the driving device in the clamping and positioning component can drive the positioning to position the PCB board in the correct posture and place it in the adsorption area. In addition, the positioning block can also clamp the PCB board to prevent the PCB board from shifting due to factors such as squeegee pressure and solder paste tension during the printing process, thereby improving the printing quality. Attached Figure Description

[0015] Figure 1 This is a perspective view of an SMT printing fixture in the embodiment.

[0016] Figure 2 This is an exploded view of a hidden drive device in an SMT printing fixture according to an embodiment.

[0017] Figure 3This is a three-dimensional view of the printed layer in the embodiment.

[0018] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0019] Figure 5 This is a perspective view of the printed layer in the embodiment.

[0020] Figure 6 This is a perspective view of the driving device in the embodiment.

[0021] Reference numerals: 1. Printed layer; 10. Suction hole; 11. Suction nozzle; 12. Slide table; 2. Fixing layer; 20. Solenoid valve; 21. Magnet; 3. Clamping and positioning assembly; 30. Positioning block; 300. First limiting part; 301. Second limiting part; 3010. Slide groove; 31. Drive device; 310. Mounting bracket; 311. Threaded sleeve; 312. Driven gear; 313. Drive motor; 314. Drive gear; 315. Screw. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0023] This embodiment provides an SMT printing fixture, combined with... Figures 1-3 and Figure 5 As shown, it includes a printing layer 1 and a fixing layer 2 arranged vertically. The printing layer 1 and the fixing layer 2 are fixedly connected by bolts. In order to ensure that the fixing layer 2 can be placed stably on the printing machine and avoid shaking during operation, multiple magnets 21 are embedded in the bottom of the fixing layer 2 so that the fixing layer 2 can be stably attached to the printing machine.

[0024] The fixed layer 2 is equipped with an air extraction device (not shown in the figure), and the upper surface of the printed layer 1 is provided with an adsorption area. The air extraction device is connected to the adsorption area at the top of the printed layer 1, which can generate an adsorption force in the adsorption area on the upper surface of the printed layer 1 so that the circuit board can be firmly adsorbed when it is placed on the printed layer 1, so as to avoid the circuit board shifting during the printing process and causing a decrease in printing quality.

[0025] Furthermore, the adsorption area is provided with multiple rows of suction holes, which are arranged horizontally along the length of the printed layer 1. Each row of suction holes includes multiple suction holes 10 spaced apart along the width of the printed layer 1, and the suction holes 10 penetrate the printed layer 1 along its thickness. In use, the circuit board to be printed is first placed on the adsorption area of ​​the printed layer 1, and then the suction holes 10 in the multiple rows of suction holes on the adsorption area are used by a vacuum device to generate an adsorption force, ultimately adsorbing the circuit board to be printed onto the adsorption area of ​​the printed layer 1.

[0026] The fixed layer 2 is also equipped with the same number of solenoid valves 20 as the multiple rows of suction holes. The outlet of each solenoid valve 20 is connected to the suction device through the main air pipe, and the inlet of each solenoid valve 20 is connected to the bottom of each suction hole 10 in the corresponding row of suction holes through multiple branch air pipes. By setting up the solenoid valves 20, the solenoid valves 20 can control the suction volume of multiple branch air pipes by adjusting their own valve opening, thereby achieving precise control of the suction force of suction holes 10 at different positions in each row of suction holes.

[0027] For details, please refer to Figure 4 As shown, this is one row of suction holes within the adsorption area. This row of suction holes consists of eight holes 10 from top to bottom, with multiple branch air pipes sequentially connected to these eight holes 10. During use, when the center of the circuit to be printed is warped, the solenoid valve 20 can adjust its own valve to increase the suction volume of suction holes 3-6 10, generating a stronger adsorption force to flatten the center of the circuit board. Conversely, when the edges of the circuit to be printed are warped, the solenoid valve 20 can adjust its own valve to increase the suction volume of suction holes 1-2 and 7-8 10, generating a stronger adsorption force to flatten the edges of the circuit board. This design allows for precise adjustment based on the warping at different locations on the circuit board, ensuring the flatness of the circuit board during printing while avoiding damage caused by excessive overall adsorption force, thus improving printing quality.

[0028] Furthermore, each suction hole 10 is equipped with a suction nozzle 11 at its bottom. The top of the suction nozzle 11 is sealed and fixedly connected to the bottom of the printed layer 1 to ensure that there is no airflow leakage between the suction nozzle 11 and the bottom of the printed layer 1. The bottom of the suction nozzle 11 is connected to a branch air pipe and fixed by a clamp. This design avoids the problem that when the branch air pipe is directly inserted into the suction hole 10, the frequent start and stop of the air pump will cause airflow impact, causing the branch air pipe to detach from the suction hole 10.

[0029] Combination Figure 1 , Figure 2 and Figure 6As shown, the SMT printing fixture also includes a clamping and positioning component 3, which includes positioning blocks 30 and driving devices 31. Two positioning blocks 30 are located on top of the printed layer 1 and arranged circumferentially along the printed layer 1. Two driving devices 31 are respectively connected to their corresponding positioning blocks 30 to drive the two positioning blocks 30 closer to or further away from each other. With this design, when the PCB board is not correctly placed in the adsorption area (e.g., due to angular deviation), the driving device 31 can drive the positioning blocks 30 to position the PCB board, ensuring it is correctly positioned in the adsorption area. Furthermore, the positioning blocks 30 can clamp the PCB board, preventing displacement during printing due to factors such as squeegee pressure and solder paste tension.

[0030] The positioning block 30 is L-shaped and includes a first limiting part 300 arranged along the length direction of the printing layer 1 and a second limiting part 301 arranged along the width direction of the printing layer 1. The positioning block 30 is slidably disposed on the top of the printing layer 1. Specifically, two slides 12 are respectively provided at both ends of the top of the printing layer 1, and the two slides 12 are arranged along the width direction of the printing layer 1. The bottom of the second limiting part 301 is provided with a groove 3010 that slides with the slides 12. Since two slides 12 are also provided at both ends of the top of the printing layer 1, and the two slides 12 are arranged along the width direction of the printing layer 1, the bottom of the second limiting part 301 is provided with a groove 3010 that slides with the slides 12. When the positioning block 30 moves under the drive of the driving device 31, the groove 3010 slides along the slides 12, providing guidance for the movement of the positioning block 30, ensuring that its movement is smooth and avoiding deviation that would affect the positioning effect. The driving device 31 is used to drive the two positioning blocks 30 to move closer or further apart. It includes a mounting bracket 310, a drive motor 313, and a screw 315. The mounting bracket 310 is fixedly mounted on the outer wall of the fixed layer 2. A threaded sleeve 311 is rotatably provided on the mounting bracket 310. The screw 315 passes through the threaded sleeve 311 and is threadedly connected to the threaded sleeve 311. One end of the screw 315 is fixedly connected to the outer wall of the second limiting part 301. The drive motor 313 is fixedly mounted on the mounting bracket 310 and located below the threaded sleeve 311. A drive gear 314 is fixedly connected to the output end of the drive motor 313. A driven gear 312 that meshes with the drive gear 314 is sleeved on the threaded sleeve 311.

[0031] When the drive motor 313 starts, the output shaft drives the drive gear 314 to rotate. The drive gear 314 drives the driven gear 312 that meshes with it to rotate, which in turn causes the threaded sleeve 311 to rotate. Since the threaded sleeve 311 is threadedly connected to the screw 315, the rotation of the threaded sleeve 311 is converted into the linear motion of the screw 315, thereby driving the positioning block 30 to move.

[0032] In the description of this utility model, it is obvious that the described embodiments are only a part of the embodiments of this utility model, and not all of them. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0033] Therefore, the above detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0034] In the description of this utility model, it should be noted that the terms "middle," "upper," "lower," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

Claims

1. An SMT printing fixture, comprising a printing layer (1) and a fixing layer (2) arranged vertically, characterized in that, An adsorption area is provided on the printed layer (1), and an air extraction device is provided in the fixed layer (2). The air extraction device is connected to the adsorption area so that the adsorption area can generate an adsorption force that can adsorb the PCB board. It also includes a clamping and positioning component (3). Two clamping and positioning components (3) are arranged facing each other to clamp and position the PCB board located in the adsorption area. The clamping and positioning component (3) includes a positioning block (30) and a driving device (31). The two positioning blocks (30) are located on the top of the printed layer (1) and are arranged around the circumference of the printed layer (1). The two driving devices (31) are respectively connected to their respective positioning blocks (30) to drive the two positioning blocks (30) to move closer or further away from each other.

2. The SMT printing fixture according to claim 1, characterized in that, The positioning block (30) is L-shaped and includes a first limiting part (300) provided along the length direction of the printed layer (1) and a second limiting part (301) provided along the width direction of the printed layer (1).

3. The SMT printing fixture according to claim 2, characterized in that, The positioning block (30) is slidably disposed on the top of the printing layer (1). The top two ends of the printing layer (1) are respectively provided with slides (12). The two slides (12) are arranged along the width direction of the printing layer (1). The bottom of the second limiting part (301) is provided with a slide groove (3010) that slides with the slides (12). The driving device (31) is connected to the outer wall of the second limiting part (301) in the positioning block (30).

4. The SMT printing fixture according to claim 3, characterized in that, The drive device (31) includes a mounting bracket (310), a drive motor (313), and a screw (315). The mounting bracket (310) is fixed to the side wall of the fixed layer (2). A threaded sleeve (311) is rotatably provided on the mounting bracket (310). The screw (315) passes through the threaded sleeve (311), and one end of the screw (315) is fixedly connected to the outer side wall of the second limiting part (301). The drive motor (313) is fixed to the mounting bracket (310) and located below the threaded sleeve (311). The output end of the drive motor (313) is fixedly connected to a drive gear (314). A driven gear (312) that meshes with the drive gear (314) is provided on the threaded sleeve (311).

5. An SMT printing fixture according to claim 1, characterized in that, The adsorption area is provided with multiple rows of suction holes arranged horizontally along the length of the printing plate, and each row of suction holes is provided with multiple suction holes (10) arranged at intervals along the width of the printing plate.

6. The SMT printing fixture according to claim 5, characterized in that, Each suction hole (10) has a suction nozzle (11) at its bottom, and the top of the suction nozzle (11) is fixedly connected to the bottom of the printing layer (1).

7. An SMT printing fixture according to claim 5, characterized in that, The fixed layer (2) is also equipped with multiple solenoid valves (20). The outlet end of each solenoid valve (20) is connected to the suction device through the main air pipe. The inlet end of each solenoid valve (20) is connected to the bottom of the suction nozzle (11) at the bottom of each suction hole (10) in the corresponding column of suction holes through multiple branch air pipes. The solenoid valve (20) can control the suction volume of multiple branch air pipes by adjusting its own valve opening, so that the suction holes (10) at different positions in each column of suction holes generate different adsorption forces.

8. An SMT printing fixture according to claim 1, characterized in that, Multiple magnets (21) are embedded in the bottom of the fixing layer (2) for attaching the fixing layer (2) to the printing press.

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