High-precision solder paste quantitative control device

Abstract

The utility model relates to photovoltaic technical field especially relates to a high accuracy tin cream ration control device. Include: push rod type point gum control valve, through vertical linear module is up and down motion on the workbench, push rod type point gum control valve bottom export is equipped with needle nozzle, and the top is connected with pneumatic point gum constant pressure control valve export end through solenoid valve, and the import end of pneumatic point gum constant pressure regulating valve is connected with gas source, tin cream needle cylinder, set up in vertical linear module, bottom is connected with push rod type point gum control valve glue cavity through the catheter, and the top is connected with gas source through tin cream needle cylinder constant pressure regulating valve. Specific, still include range finding module, range finding module includes fixedly set up in push rod constant pressure control valve side portion's laser range finding sensor, for detecting work piece surface to be waiting for point tin cream place needle nozzle's distance. The utility model improves point gum yield and process stability significantly.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to a high-precision solder paste quantitative control device. Background Technology

[0002] In the field of electronic component soldering, as electronic products develop towards miniaturization, lightweighting, and high performance, the integration of electronic components is becoming increasingly higher, and the pin spacing is becoming smaller, which places extremely high demands on the soldering process. Solder paste application technology, as a critical step, must achieve micro-volume and precise control. In precision electronic products such as smartphones and computer CPUs, chip soldering requires precisely applying solder paste to tiny pads within an extremely small space to ensure reliable electrical connection and mechanical fixation between the electronic components and the circuit board. Even slight deviations can lead to problems such as cold solder joints and short circuits, causing electronic products to malfunction and fail to operate normally.

[0003] Traditional solder paste application devices rely on constant air pressure to propel solder paste. Although the amount of solder dispensed can be controlled by adjusting the air pressure and the application time, there is a fatal flaw: when the amount of solder paste in the syringe decreases, the air pressure transmission path becomes longer, leading to a decrease in the actual solder dispensing pressure and a "more at the beginning, less at the end" problem. Especially in mass production, the amount of solder paste in the same batch of products can vary by more than 25%, seriously affecting the consistency of soldering. The pad spacing of components such as chip bottom pads and connector contacts is extremely small (<0.3mm), which places extremely high demands on the consistency of solder paste dispensing amount and shape. Too much solder paste will cause short circuits, too little will cause cold solder joints, and incomplete coverage will cause electrochemical corrosion. Therefore, how to improve the consistency and stability of solder paste dispensing amount is a technical problem that urgently needs to be solved in this case. Utility Model Content

[0004] To address the above problems, this utility model provides a high-precision solder paste quantitative control device that improves the consistency, stability, and accuracy of solder paste application.

[0005] The technical solution of this utility model is: A high-precision solder paste dispensing control device, comprising: A push rod type dispensing control valve moves up and down on the worktable via a vertical linear module; the bottom outlet of the push rod type dispensing control valve is equipped with a needle nozzle, and the top is connected to the outlet end of a pneumatic dispensing constant pressure regulating valve via a solenoid valve; the inlet end of the pneumatic dispensing constant pressure regulating valve is connected to an air source. The solder paste syringe is mounted on the vertical linear module. Its bottom is connected to the glue inlet chamber of the push rod type dispensing control valve via a conduit, and its top is connected to the air source via the solder paste syringe constant pressure regulating valve.

[0006] Specifically, it also includes a ranging module; The ranging module includes a laser ranging sensor fixedly mounted on the side of the push rod type dispensing control valve, used to detect the distance from the workpiece surface where solder paste is to be applied to the nozzle.

[0007] Specifically, a pneumatic dispensing constant pressure regulating valve is provided between the solenoid valve and the air source.

[0008] Specifically, the pneumatic dispensing constant pressure regulating valve and the solder paste syringe constant pressure regulating valve are respectively connected to the air source through an air source triplet.

[0009] Specifically, the air source triplet includes an air filter, a pressure reducing valve, and an oil-gas filter connected in series.

[0010] Specifically, the constant voltage tin-point module is mounted on the gantry-type robotic arm of the production line via a support base.

[0011] Specifically, the support base includes: The base is mounted on the gantry-type robotic arm of the production line; The first adjustment seat is horizontally movable and mounted on the top of the base; The second adjustment seat is horizontally movable on top of the first adjustment seat, and its movement direction is perpendicular to the movement direction of the first adjustment seat.

[0012] Specifically, the base and the first adjusting seat are horizontally adjusted via a first adjusting mechanism; The first adjustment mechanism includes: The first adjusting block is fixedly connected to the side of the base; The first support block is fixedly installed on the side of the first adjusting seat; The first adjusting screw is adjustablely mounted on the first adjusting block, and its tail end is connected to the first top support block; The first reset spring has one end connected to the base and the other end connected to the first adjusting seat; the direction of the reset force of the first reset spring is parallel to the adjustment direction of the first adjusting seat.

[0013] Specifically, the first adjusting seat and the second adjusting seat are horizontally adjusted by a second adjusting mechanism; the second adjusting mechanism includes: The second adjusting block is fixedly connected to the side of the first adjusting seat; The second adjusting screw is adjustablely mounted on the second threaded hole, and its tail end is connected to the second adjusting seat. The second reset spring is parallel to the adjustment direction of the second adjusting screw, with one end connected to the second adjusting seat and the other end connected to the second adjusting block.

[0014] Specifically, the solenoid valve is a high-frequency solenoid valve with model number 35A-ACA-DDFA-1BA.

[0015] This invention employs a composite structure design of "dual constant pressure regulation + two-stage damping drive (solder paste syringe constant pressure regulating valve + solder paste syringe) + high-frequency solenoid valve" to form a smooth solder paste delivery and precise cutting mechanism throughout the entire process. The dual constant pressure regulator can output a stable and controllable driving force, ensuring that the solder paste flows continuously and evenly in the two-stage control path composed of the syringe and control valve, completely solving the problem of delivery obstruction of high-viscosity materials; the high-frequency solenoid valve drives the valve core push rod to achieve millisecond-level response, with fast and powerful action, and can complete precise cutting the solder paste the moment it leaves the nozzle, effectively suppressing the extensibility of viscous materials, shortening the wire length to less than 0.1mm, reducing the tailing phenomenon rate to less than 1%, and reducing the risk of blockage caused by metal particles by 80%, significantly improving dispensing yield and process stability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the control principle of the push rod type dispensing control valve and the solder paste syringe constant pressure control valve; Figure 2 This is a three-dimensional structural diagram of the present invention; Figure 3 This is a three-dimensional structural diagram showing the connection state between the push rod type dispensing control valve and the solder paste syringe constant pressure control valve. Figure 4 This is a three-dimensional structural diagram of the first and second adjustment mechanisms; Figure 5 This is a schematic diagram of the reset spring structure; In the diagram, 110 is a push-rod type dispensing control valve, 111 is a vertical linear module, 1111 is a vertical motor, 1112 is a slide, 1113 is a horizontal plate, 1114 is the third return spring, 112 is the nozzle, and 113 is a pneumatic dispensing constant pressure regulating valve. 120 is the constant pressure control valve for solder paste syringes, and 121 is the constant pressure regulating valve for solder paste syringes. 200 is the ranging module. 300 is the support base, 310 is the base, 320 is the first adjustment seat, and 330 is the second adjustment seat. 400 is the first adjusting mechanism, 410 is the first adjusting block, 420 is the first support block, 430 is the first adjusting screw, 440 is the first return spring, and 450 is the first locking screw. 500 is the second adjusting mechanism, 510 is the second adjusting block, 520 is the second adjusting screw, 530 is the second return spring, and 540 is the second locking screw; 600 is a vision sensor. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0018] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," "right," "vertical," and "horizontal," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are 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, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] The following is for reference. Figure 1-5 Introducing the complete set of equipment in this case; A solder paste application device includes a constant voltage solder paste application module and a distance measuring module 200 disposed on a worktable. The constant voltage soldering module includes: The push rod type dispensing control valve 110 moves up and down on the worktable via the vertical linear module 111; the bottom outlet of the push rod type dispensing control valve 110 is provided with a fixedly connected needle nozzle 112, and the top is connected to the outlet end of the pneumatic dispensing constant pressure regulating valve 113 via a solenoid valve; the inlet end of the pneumatic dispensing constant pressure regulating valve 113 is connected to the air source. Specifically, in this case, the solenoid valve is a high-frequency two-position four-way solenoid valve, model 35A-ACA-DDFA-1BA, and a pneumatic dispensing constant pressure regulating valve 113 is installed between it and the air source. The pneumatic dispensing constant pressure regulating valve 113 and the solder paste syringe constant pressure regulating valve 121 are respectively connected to the air source through an air source triplet. The air source triplet includes an air filter, a pressure reducing valve, and an oil-gas filter connected in series.

[0021] The push-rod type dispensing control valve 110 receives solder paste through the guide channel of the solder paste syringe 120. This means the dispensing control of the solder paste syringe 120 is the primary control, while the control of the push-rod type dispensing valve 110 is the secondary control. This secondary control refines the dispensing of the solder paste from the primary control, resulting in more precise dispensing. The secondary control of the dispensing valve is linked to the accurate data feedback from the laser distance measuring instrument and the positioning control of the Z-axis motion platform.

[0022] The solder paste syringe 120 is mounted on the vertical linear module 111. Its bottom is connected to the glue inlet chamber of the push-rod type dispensing control valve 110 via a conduit, and its top is connected to an air source via a solder paste syringe constant pressure regulating valve 121. The constant pressure regulating valve 121 stabilizes the syringe air pressure, ensuring stable solder paste supply pressure. Direct dispensing with the solder paste syringe would result in insufficient buffer space, leading to over-dispensing, under-dispensing, or inaccurate dispensing. In this design, the solder paste syringe 120 is equipped with a photoelectric switch sensor. When the solder paste level reaches a set lower limit, it sends an alarm signal to replace the solder paste.

[0023] The ranging module 200 includes a laser ranging sensor fixedly installed on the side of the push rod type dispensing control valve 110, with a detection accuracy of 0.02mm, used to detect the distance from the workpiece surface where solder paste is to be applied to the nozzle 112.

[0024] First, it should be noted that the base 300 of the constant voltage soldering module can be connected to the gantry-type robot arm of the production line or to a linear drive mechanism to control the direction of movement according to motion requirements. The constant voltage soldering module is equipped with an adjustment mechanism of approximately 20mm (manual or automatic) in the X, Y, and Z axes. The gantry-type robot arm of the production line drives the constant voltage soldering module and the laser rangefinder together. The distance from the laser emitter to the surface of the workpiece at the pre-dispensing position, detected by the laser rangefinder, can be reflected as the distance from the surface of the workpiece at the pre-dispensing position to the solder paste nozzle 112.

[0025] In this case, the constant voltage soldering module is mounted on the gantry-type robotic arm of the production line via a support base 300. The support base 300 includes: Base 310 is mounted on the gantry-type robotic arm of the production line; The first adjustment seat 320 is horizontally movable and disposed on the top of the base 310; The second adjusting seat 330 is horizontally movable on top of the first adjusting seat 320, and its moving direction is perpendicular to the moving direction of the first adjusting seat 320.

[0026] The base 310 and the first adjusting seat 320 are horizontally adjusted by the first adjusting mechanism 400; in this case, the base 310 and the first adjusting seat 320 can be limited by a boss or guide rail, etc., to achieve longitudinal (Y-axis direction) adjustment; The first regulating mechanism 400 includes: The first adjusting block 410 is fixedly connected to the side of the base 310; The first support block 420 is fixedly installed on the side of the first adjusting seat 320; The first adjusting screw 430 is adjustablely fixed on the first adjusting block 410 by a thread, and its tail end is connected to the first top support block 420. The first return spring 440 has one end connected to the base 310 and the other end connected to the first adjustment seat 320; the direction of the return force of the first return spring 440 is parallel to the adjustment direction of the first adjustment seat 320.

[0027] In this invention, the inner side of the first adjusting block 410 is fixedly connected to the base 310 by bolts, and its top surface is higher than the top surface of the base 310. A first dividing groove is provided in the middle of the outer side, penetrating the first threaded hole, dividing the area near the outer side of the first adjusting block 410 into left and right halves. The top or bottom of one half is provided with a first locking groove communicating with the first threaded hole. A first locking screw 450 is provided on the first locking groove via a threaded connection. Rotation of the first locking screw 450 controls the size of the opening of the first locking groove, thereby achieving a locked or adjustable state for the first adjusting screw 430. A first return spring 440 is located on the opposite side of the first adjusting block 410.

[0028] The first adjusting seat 320 and the second adjusting seat 330 are horizontally adjusted by the second adjusting mechanism 500; in this case, the second adjusting seat 330 and the first adjusting seat 320 can be limited by a boss or guide rail, etc., to achieve lateral (X-axis direction) adjustment; The second regulating mechanism 500 includes: The second adjusting block 510 is fixedly connected to the side of the first adjusting seat 320; The second adjusting screw 520 is adjustablely mounted on the second threaded hole via a thread, and its tail end is connected to the second adjusting seat 330. The second reset spring 530 is parallel to the adjustment direction of the second adjusting screw 520, with one end connected to the second adjusting seat 330 and the other end connected to the second adjusting block 510.

[0029] The inner side of the second adjusting block 510 is fixedly connected to the first adjusting seat 320, and its top surface is higher than the top surface of the first adjusting seat 320. The top surface is provided with a second dividing groove that passes through the second threaded hole, dividing the area near the top of the second adjusting block 510 into inner and outer halves. One side of one half is provided with a second locking groove that communicates with the second threaded hole. The second locking groove is provided with a second locking screw 540 that is connected by a thread. By rotating the second locking screw 540, the size of the opening of the second locking groove is controlled, thereby realizing the locking or adjustable state of the second adjusting screw 520.

[0030] The aforementioned vertical straight module 111 includes: The vertical motor 1111 is vertically fixed on the top of the second adjusting block 510, and its rotating shaft is connected to the vertical lead screw drive. The slide block 1112 has a slider fixedly connected to its back, and the second adjusting block 510 has a guide rail adapted to the slider on its side. The slide block 1112 has a fixedly installed screw sleeve inside, which drives the slide block 1112 to move up and down through the vertical screw. The slide block 1112 has a pair of parallel clamping plates, and the clamping plates have sleeve holes adapted to the solder paste syringe constant pressure control valve 120. The side of the clamping plates has a notch communicating with the sleeve hole. By tightening the notch, the solder paste syringe constant pressure control valve 120 is vertically fixed on the slide block 1112. The horizontal plate 1113 is fixedly installed below the clamping plate and is used to connect the push rod type dispensing control valve 110 and the ranging module 200. The slide 1112 of this invention is provided with a third return spring 1114 on its side. The top of the third return spring 1114 is connected to the second adjusting block 510, and the bottom is connected to the slide 1112.

[0031] In this case, the vertical linear module realizes the up-and-down (z-direction) movement of the nozzle 112; its termination position is monitored and controlled in real time by the ranging module 200, which detects the distance from the tooling base plate to the solder paste nozzle. When the nozzle 112 reaches the preset position, the constant pressure soldering module is activated, and the constant pressure control valve 120 of the solder paste delivery syringe is activated. The solder paste is delivered to the push rod type dispensing control valve 110 through the conduit. The solder paste dispensing process is precisely controlled by the opening and closing of the high-frequency solenoid valve. When the amount of solder paste reaches the set value, the ranging module 200 triggers the solenoid valve to close by detecting the position change, thereby achieving precise control of the dispensing amount.

[0032] A visual feedback detection module, including an industrial vision camera, is located at the next station on the side of the constant voltage soldering module. After processing, the product is randomly pushed under the industrial vision camera for photographing and comparison with existing models in the database. If the solder paste area exceeds a set limit, an alarm module is triggered, requiring manual intervention. Traditional equipment lacks real-time monitoring, and problems are only detected during post-reflow inspection, leading to batch defects. This solution's alarm module integrates monitoring of material level, pressure, position, and visual signals to achieve real-time alarms for process anomalies.

[0033] Regarding the information disclosed in this case, the following points need to be clarified: (1) The accompanying drawings of the embodiments disclosed in this case only involve the structures involved in the embodiments disclosed in this case; other structures can refer to the general design. (2) Where there is no conflict, the embodiments and features disclosed in this case can be combined with each other to obtain new embodiments; The above are merely specific embodiments disclosed in this case, but the scope of protection of this disclosure is not limited thereto. The scope of protection disclosed in this case shall be determined by the scope of protection of the claims.

Claims

1. A high-precision solder paste metering control device, characterized in that, include: A push rod type dispensing control valve (110) moves up and down on the worktable via a vertical linear module (111); the push rod type dispensing control valve (110) has a needle nozzle (112) at its bottom outlet, and its top end is connected to the outlet end of a pneumatic dispensing constant pressure regulating valve (113) via a solenoid valve; the inlet end of the pneumatic dispensing constant pressure regulating valve (113) is connected to an air source. Solder paste syringe (120) is mounted on the vertical linear module (111). Its bottom is connected to the glue inlet chamber of the push rod type dispensing control valve (110) via a conduit, and its top is connected to the air source via the solder paste syringe constant pressure regulating valve (121).

2. The high-precision solder paste quantitative control device according to claim 1, characterized in that, It also includes a ranging module (200); The ranging module (200) includes a laser ranging sensor fixedly installed on the side of the push rod type dispensing control valve (110) for detecting the distance from the workpiece surface where solder paste is to be applied to the nozzle (112).

3. The high-precision solder paste quantitative control device according to claim 1, characterized in that, A pneumatic dispensing constant pressure regulating valve (113) is provided between the solenoid valve and the air source.

4. The high-precision solder paste metering control device according to claim 1, characterized in that, The pneumatic dispensing constant pressure regulating valve (113) and the solder paste syringe constant pressure regulating valve (121) are respectively connected to the air source through an air source triplet.

5. The high-precision solder paste quantitative control device according to claim 4, characterized in that, The air source triplet includes an air filter, a pressure reducing valve, and an oil-gas filter connected in series.

6. The high-precision solder paste metering control device according to claim 1, characterized in that, The constant voltage soldering module is mounted on the gantry robot arm of the production line via a support base (300).

7. A high-precision solder paste metering control device according to claim 6, characterized in that, The support base (300) includes: The base (310) is mounted on the gantry robot arm of the production line; The first adjustment seat (320) is horizontally movable and disposed on the top of the base (310); The second adjustment seat (330) is horizontally movable on top of the first adjustment seat (320), and its movement direction is perpendicular to the movement direction of the first adjustment seat (320).

8. The high-precision solder paste quantitative control device according to claim 7, characterized in that, The base (310) and the first adjusting seat (320) are horizontally adjusted by the first adjusting mechanism (400); The first adjustment mechanism (400) includes: The first adjusting block (410) is fixedly connected to the side of the base (310); The first top support block (420) is fixedly installed on the side of the first adjusting seat (320); The first adjusting screw (430) is adjustablely mounted on the first adjusting block (410), and its tail end is connected to the first top support block (420); The first reset spring (440) is connected at one end to the base (310) and at the other end to the first adjusting seat (320); the direction of the reset force of the first reset spring (440) is parallel to the adjustment direction of the first adjusting seat (320).

9. A high-precision solder paste quantitative control device according to claim 8, characterized in that, The first adjusting seat (320) and the second adjusting seat (330) are horizontally adjusted by a second adjusting mechanism (500); the second adjusting mechanism (500) includes: The second adjusting block (510) is fixedly connected to the side of the first adjusting seat (320); The second adjusting screw (520) is adjustablely mounted on the second threaded hole, and its tail end is connected to the second adjusting seat (330); The second reset spring (530) is parallel to the adjustment direction of the second adjusting screw (520), with one end connected to the second adjusting seat (330) and the other end connected to the second adjusting block (510).

10. A high-precision solder paste metering control device according to claim 1, characterized in that, The solenoid valve is a high-frequency solenoid valve with model number 35A-ACA-DDFA-1BA.

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