Anti-offset SMT welding structure

Abstract

This utility model discloses an anti-offset SMT soldering structure, including a conveyor base and a conveyor belt connected to it via a rotating roller. The conveyor base has a slot on its top, and a PCB board is mounted on top of the conveyor belt. A printed stencil is held in place within the slot. The structure also includes a printing mechanism: the printing mechanism includes a slide rail mounted on top of the conveyor base, a reciprocating lead screw rotatably connected to the rear top of the slide rail, and a crossbar rotatably connected to the front top of the slide rail. A threaded seat is threaded onto the surface of the reciprocating lead screw, and a feeding box is fixedly connected to the front of the threaded seat. A printing roller is rotatably connected inside the feeding box. This anti-offset SMT soldering structure provides a uniform and even application of solder paste to the PCB, preventing subsequent soldering misalignment.

Description

Technical Field

[0001] This utility model relates to the field of SMT soldering technology, and in particular to an anti-offset SMT soldering structure. Background Technology

[0002] SMT soldering is a mainstream process in modern electronics manufacturing. Its core is to directly mount micro-electronic components onto the surface of a printed circuit board (PCB), print solder paste onto fixed positions using a stencil, and then achieve electrical connection through reflow soldering or wave soldering. This technology is characterized by high density, high efficiency, and high degree of automation, and is widely used in mobile phones, automotive electronics, and other fields.

[0003] If the stencil and PCB are misaligned during solder paste printing or the solder paste is unevenly printed, it will cause deviations in electronic components during subsequent heating and soldering, affecting the fixation of electronic components, and leading to circuit disconnection or failure, thus affecting the overall pass rate. For example, when applying solder paste to a PCB board, uneven printing at the pins of electronic components can cause the pins of micro-electronic components to shift during the heating process due to the centering heat creep effect. This can prevent them from accurately connecting with the PCB board circuitry, making it impossible for the overall circuit to form a loop, thus affecting the normal operation of the entire PCB board. Utility Model Content

[0004] This utility model discloses an anti-misalignment SMT soldering structure, which aims to solve the technical problem that when the stencil and PCB are misaligned during solder paste printing or the solder paste is printed unevenly, the electronic components will deviate during the subsequent heating and soldering process, affecting the fixation effect of the electronic components and thus affecting the overall pass rate.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An anti-offset SMT soldering structure includes a conveyor base and a conveyor belt connected to it via a rotating roller drive. The conveyor base has a slot on its top, and a PCB board is mounted on top of the conveyor belt. A printed stencil is held in place within the slot. The structure also includes: a printing mechanism: the printing mechanism includes a slide rail mounted on the top of the conveyor base, a reciprocating lead screw rotatably connected to the rear side of the top of the slide rail, a crossbar rotatably connected to the front side of the top of the slide rail, a threaded seat threaded onto the surface of the reciprocating lead screw, a feeding box fixedly connected to the front side of the threaded seat, and a printing roller rotatably connected inside the feeding box; and a positioning mechanism: the positioning mechanism is fixedly connected to the middle of the conveyor base.

[0006] In this solution, a printing mechanism can evenly and smoothly print solder paste onto the solder pads of the PCB board. A servo motor drives a reciprocating screw to rotate, causing a threaded seat to make precise reciprocating linear movements along a slide rail. The unloading box, which is fixed to the threaded seat, moves synchronously. The unloading box contains solder paste, and a printing roller with an opening at its bottom rotates under friction. As the unloading box moves smoothly under the drive of the reciprocating screw, the rotating printing roller evenly presses the solder paste in the unloading box through the mesh of the printing stencil, thereby accurately coating it onto the solder pads of the PCB board positioned below. The crossbar on the front side of the slide rail provides additional support and guidance for the entire moving assembly, ensuring the smoothness and consistency of the printing process.

[0007] In a preferred embodiment, the positioning mechanism includes a connecting seat fixedly connected to the middle of the conveyor seat, an infrared sensor fixedly connected to the middle of the connecting seat, electric lifting rods fixedly connected to the front and rear sides of the top of the connecting seat, and vertical rods slidably connected to the four corners of the top of the connecting seat.

[0008] In this solution, a positioning mechanism monitors the position of the PCB board and issues work commands to other mechanisms. An infrared sensor fixed in the middle of the connecting seat monitors the position of the PCB board on the conveyor belt in real time. When the PCB board moves to the printing station with the conveyor belt, the infrared sensor detects that the PCB board has reached the predetermined position and sends a signal. Upon receiving the signal, the control system immediately activates the electric lifting rods on the front and rear sides of the top of the connecting seat. The electric lifting rods move downward synchronously, moving the printing mechanism fixed to them to the working position. At this point, a printing command can be issued to begin printing. After printing is completed, the printing mechanism resets and drives the conveyor belt to continue working, transporting the processed PCB board out.

[0009] As described above, an anti-offset SMT soldering structure includes a conveyor base and a conveyor belt connected to it via a rotating roller. The conveyor base has a slot on its top, and a PCB board is mounted on top of the conveyor belt. A printed stencil is held in place within the slot. The structure also includes: a printing mechanism: the printing mechanism includes a slide rail mounted on the top of the conveyor base, a reciprocating lead screw rotatably connected to the rear side of the top of the slide rail, a crossbar rotatably connected to the front side of the top of the slide rail, a threaded seat threaded onto the surface of the reciprocating lead screw, a feeding box fixedly connected to the front side of the threaded seat, and a printing roller rotatably connected inside the feeding box; and a positioning mechanism: the positioning mechanism is fixedly connected to the middle of the conveyor base. The anti-offset SMT soldering structure provided by this invention has the technical effect of uniformly and evenly applying solder paste to the PCB, preventing subsequent soldering offset. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of an anti-offset SMT welding structure proposed in this utility model.

[0011] Figure 2 This is a PCB board illustration of an anti-offset SMT soldering structure proposed in this utility model.

[0012] Figure 3 This is a top view of the printing mechanism of an anti-offset SMT soldering structure proposed in this utility model.

[0013] Figure 4 This diagram illustrates a positioning mechanism for an anti-displacement SMT welding structure proposed in this utility model.

[0014] Figure 5 This is a flowchart illustrating the process of an anti-offset SMT soldering structure proposed in this utility model.

[0015] In the attached diagram: 1. Conveyor seat; 2. Conveyor belt; 3. Card slot; 4. PCB board; 5. Printed stencil; 6. Slide rail; 7. Reciprocating lead screw; 8. Crossbar; 9. Threaded seat; 10. Feed box; 11. Printing roller; 12. Connecting seat; 13. Infrared sensor; 14. Electric lifting rod; 15. Vertical rod. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and marked in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0017] The SMT welding structure disclosed in this utility model is mainly used in scenarios where solder paste is printed evenly and flatly on PCB boards to ensure the subsequent welding effect.

[0018] Reference Figure 1 , Figure 2 and Figure 3An anti-offset SMT soldering structure includes a conveyor seat 1 and a conveyor belt 2 connected inside it via a rotating roller drive. The top of the conveyor seat 1 has a slot 3, and the top of the conveyor belt 2 is provided with a PCB board 4. A printed stencil 5 is engaged inside the slot 3. The structure also includes: a printing mechanism: the printing mechanism includes a slide rail 6 disposed on the top of the conveyor seat 1, a reciprocating screw 7 rotatably connected to the rear side of the top of the slide rail 6, a crossbar 8 rotatably connected to the front side of the top of the slide rail 6, a threaded seat 9 threadedly connected to the surface of the reciprocating screw 7, a feeding box 10 fixedly connected to the front side of the threaded seat 9, and a printing roller 11 rotatably connected inside the feeding box 10; and a positioning mechanism: the positioning mechanism is fixedly connected to the middle of the conveyor seat 1.

[0019] Specifically, the reciprocating screw 7 is rotated by a servo motor, which drives the threaded seat 9 to make precise reciprocating linear motion along the slide rail 6. The unloading box 10, which is fixed to the threaded seat 9, moves synchronously. The unloading box 10 stores solder paste. The printing roller 11, which is set at the bottom of the unloading box, rotates under the action of friction. When the unloading box 10 moves smoothly under the drive of the reciprocating screw 7, the rotating printing roller 11 presses the solder paste in the unloading box 10 evenly through the mesh of the printing stencil 5, thereby accurately coating it onto the pads of the PCB board 4 that is in the positioning state below.

[0020] The slide rail 6 is fixedly connected to the middle of the positioning mechanism on both the front and rear sides. The reciprocating screw 7 and the crossbar 8 are rotatably connected to the top of the slide rail 6 through rotating seats. A fixed servo motor is fixedly connected to the left end of the reciprocating screw 7. By directly and rigidly fixing the slide rail 6 to the middle of the positioning mechanism, the motion reference of the entire printing mechanism is ensured to be highly consistent with the precise positioning reference of the PCB board 4. This greatly reduces the relative vibration or position drift caused by the separation of mechanical structures, and provides a solid platform foundation for high-precision printing.

[0021] The feeding box 10 is slidably connected to the middle of the slide rail 6. The front side of the feeding box 10 is slidably connected to the surface of the crossbar 8 through a sliding sleeve. The printing roller 11 is rotatably connected to the bottom of the feeding box 10. The bottom of the printing roller 11 is slightly lower than the bottom of the feeding box 10. The rotational motion of the lead screw is converted into linear motion of the feeding box 10 along the slide rail 6 through the threaded engagement of the threaded seat 9 and the reciprocating lead screw 7. At the same time, the front side of the feeding box 10 forms a second sliding support with the crossbar 8 through the sliding sleeve, ensuring the high stability and trajectory straightness of the feeding box 10 and the solder paste inside during the movement process. This is crucial for obtaining uniform and consistent solder paste printing.

[0022] Reference Figure 1 , Figure 2 and Figure 4, in a preferred embodiment, the positioning mechanism includes a connecting seat 12 fixedly connected to the middle of the conveying seat 1. An infrared sensor 13 is fixedly connected to the middle of the connecting seat 12. Electric lifting rods 14 are fixedly connected to the front and rear sides of the top of the connecting seat 12. Vertical rods 15 are slidably connected to the four corners of the top of the connecting seat 12.

[0023] Specifically, the infrared sensor 13 fixed to the middle of the connecting seat 12 detects the position of the PCB board 4 on the conveyor belt 2 in real time. When the PCB board 4 moves to the printing station along with the conveyor belt 2, the infrared sensor 13 detects that the PCB board 4 has reached the predetermined position and sends a signal. After the control system receives the signal, it immediately starts the electric lifting rods 14 on the front and rear sides of the top of the connecting seat 12. The electric lifting rods 14 move downward synchronously, and when the printing mechanism fixed to them moves to the working position, a printing instruction can be issued to start the printing work.

[0024] Among them, the connecting seat 12 is in the shape of a Chinese character 'Ri'. The middle horizontal plate of the connecting seat 12 is fitted under the conveyor belt 2. The bottom ends of the electric lifting rods 14 and the vertical rods 15 are fixedly connected to the slide rail 6 through a connecting plate. Through the fixation of the connecting plate, the switching of the working state of the printing mechanism is realized. The infrared sensor 13 controls the servo motors of the conveyor belt 2 and the reciprocating screw rod 7 through a circuit and PLC programming. The infrared sensor 13 is connected to the electric lifting rod 14 through a circuit. Using the infrared sensor 13 as the 'eye' and 'trigger' of the entire printing structure, an intelligent control system is formed with the PLC.

[0025] Refer to Figure 1 、 Figure 2 and Figure 5 , in a preferred embodiment, a strip-shaped through hole is provided in the middle of the conveyor belt 2. The PCB board 4 is传动连接 (it seems there is a wrong expression here, maybe 'driven and connected') to the middle of the conveying seat 1 through the conveyor belt 2. The bottom of the printing stencil 5 is fitted on the top of the PCB board 4.

[0026] Specifically, the light of the infrared sensor 13 passes through the strip-shaped through hole provided in the middle of the conveyor belt 2 and shines on the bottom of the printing stencil 5. When the conveyor belt 2 conveys the PCB board 4 to contact the ray, a series of instructions can be conveyed through the circuit and programming to start the printing operation.

[0027] Working Principle: When using the device, solder paste is added to the opening at the top of the unloading box 10, and the printing stencil 5 is inserted into the slot 3 at the top of the conveyor seat 1. The PCB board 4 can then be placed on the conveyor belt 2. The conveyor belt 2 carries the PCB board 4. The position of the PCB board 4 on the conveyor belt 2 is monitored in real time by an infrared sensor 13 fixed in the middle of the connecting seat 12. When the PCB board 4 moves to the printing station with the conveyor belt 2, the infrared sensor 13 detects that the PCB board 4 has reached the predetermined position and sends a signal. After receiving the signal, the control system immediately starts the electric lifting rods 14 on the front and rear sides of the top of the connecting seat 12. The electric lifting rods 14 move downward synchronously, driving the printing mechanism fixed to them to the working position. When the infrared sensor 13 detects that the PCB board 4 has reached the predetermined position, the infrared sensor 13 sends a signal. Sensor 13 controls the servo motor at the left end of the reciprocating lead screw 7 to run. The servo motor drives the reciprocating lead screw 7 to rotate, causing the threaded seat 9 to make precise reciprocating linear motion along the slide rail 6. The feed box 10, which is fixed to the threaded seat 9, moves synchronously. The feed box 10 stores solder paste. The printing roller 11, which is set at the bottom of the feed box, rotates under the action of friction. When the feed box 10 moves smoothly under the drive of the reciprocating lead screw 7, the rotating printing roller 11 presses the solder paste in the feed box 10 evenly through the mesh of the printing stencil 5, thereby accurately coating it onto the pads of the PCB board 4, which is in the positioning state below. After printing is completed, the infrared sensor 13 controls the printing mechanism to reset and drives the conveyor belt 2 to continue working, conveying the processed PCB board 4 out.

[0028] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made based on the technical solution and inventive concept of this utility model should all be covered within the protection scope of this utility model.

Claims

1. An anti-deviation SMT welding structure, comprising a conveying seat (1) and a conveying belt (2) connected inside the conveying seat (1) through a rotating roller transmission, a clamping groove (3) is formed on the top of the conveying seat (1), a PCB board (4) is arranged on the top of the conveying belt (2), and a printed steel mesh (5) is clamped in the clamping groove (3), characterized in that, Further included are: Printing mechanism: The printing mechanism includes a slide rail (6) provided on the top of the conveying seat (1). A reciprocating lead screw (7) is rotatably connected to the rear side of the top of the slide rail (6), and a cross bar (8) is rotatably connected to the front side of the top of the slide rail (6). A threaded seat (9) is threadedly connected to the surface of the reciprocating lead screw (7). A blanking box (10) is fixedly connected to the front side of the threaded seat (9). A printing roller (11) is rotatably connected inside the blanking box (10). Positioning mechanism: The positioning mechanism is fixedly connected to the middle of the conveying seat (1).

2. The offset-resistant SMT solder structure of claim 1, wherein, The middle parts of the front and rear sides of the slide rail (6) are fixedly connected to the middle of the positioning mechanism. The left and right ends of the reciprocating lead screw (7) and the cross bar (8) are rotatably connected to the top of the slide rail (6) through rotating seats. A fixed servo motor is fixedly connected to the left end of the reciprocating lead screw (7).

3. A misalignment resistant SMT solder structure according to claim 2, characterized in that The blanking box (10) is slidably connected to the middle of the slide rail (6). The front side of the blanking box (10) is slidably connected to the surface of the cross bar (8) through a sliding sleeve. The printing roller (11) is rotatably connected to the bottom of the blanking box (10), and the bottom of the printing roller (11) is slightly lower than the bottom of the blanking box (10).

4. The offset-resistant SMT solder structure of claim 1, wherein, The positioning mechanism includes a connecting seat (12) fixedly connected to the middle of the conveying seat (1). An infrared sensor (13) is fixedly connected to the middle of the connecting seat (12). Electric lifting rods (14) are fixedly connected to the front and rear sides of the top of the connecting seat (12). Vertical rods (15) are slidably connected to the four corners of the top of the connecting seat (12).

5. A shift-resistant SMT solder structure according to claim 4, characterized in that The connecting seat (12) is in the shape of a Chinese character 'Ri'. The middle horizontal plate of the connecting seat (12) is attached to the lower side of the conveyor belt (2). The bottom ends of the electric lifting rods (14) and the vertical rods (15) are fixedly connected to the slide rail (6) through connecting plates.

6. A shift-resistant SMT solder structure according to claim 5, characterized in that The infrared sensor (13) controls the conveyor belt (2) and the servo motor of the reciprocating lead screw (7) through a circuit and PLC programming. The infrared sensor (13) is connected to the electric lifting rod (14) through a circuit.

7. The offset-resistant SMT solder structure of claim 1, wherein, A strip-shaped through hole is provided in the middle of the conveyor belt (2). The PCB board (4) is connected to the middle of the conveying seat (1) through the conveyor belt (2) in a driving manner. The bottom of the printing steel mesh (5) is attached to the top of the PCB board (4).

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