A copper column dragging jig for SMT patch

Abstract

The utility model relates to a kind of copper column dragging jigs for SMT patch, comprising: jig carrier, for carrying and fixed printed circuit board;Elastic ejector pin, multiple the elastic ejector pin is located on the jig carrier, the position of the elastic ejector pin corresponds with the position of nut column on the printed circuit board IC driving surface;When printed circuit board is fixed on the jig carrier, the end of the elastic ejector pin is upwardly resisted the bottom of nut column under the action of elastic pressure, to make when tin paste melts in reflow soldering process, the continuous top force provided by the elastic ejector pin promotes the top of nut column to be attached to the pad surface of printed circuit board.The utility model has the beneficial effect that the consistency and stability of welding quality can be improved, and production quality can be improved.

Description

Technical Field

[0001] This utility model relates to the field of SMT (Surface Mount Technology) technology, specifically to a copper pillar jig for SMT assembly. Background Technology

[0002] In the field of electronics manufacturing, SMT (Surface Mount Technology) is a key technology for mounting electronic components onto printed circuit boards (PCBs). Taking the X2.6 LED board of the X series as an example, its driving surface has about 30 nut pillars. In the past, the nut pillars required manual soldering and straightening operations.

[0003] Manually adding solder is not only time-consuming, but also difficult to guarantee in terms of uniformity and accuracy. It is easy to have too much or too little solder. Too much solder may cause short circuits, while too little solder will make the connection between the nut post and the circuit board weak, affecting the performance and stability of the product. Manually straightening the nut post is also a tedious and inefficient task, requiring workers to have high operating skills and patience, resulting in high labor costs. Furthermore, it is difficult to control the straightening angle and positional accuracy of the nut post, which may affect subsequent assembly and the overall quality of the product. Utility Model Content

[0004] The purpose of this invention is to provide a copper pillar jig for SMT assembly that can improve the consistency and stability of welding quality and improve production quality.

[0005] A copper pillar jig for SMT placement, comprising: Fixture carrier, used to support and fix printed circuit boards; Elastic ejector pins, a plurality of elastic ejector pins are disposed on the fixture carrier, and the positions of the elastic ejector pins correspond to the positions of the nut posts on the IC driving surface of the printed circuit board. When the printed circuit board is fixed on the fixture carrier, the end of the elastic pin presses upward against the bottom of the nut post under elastic pressure, so that when the solder paste melts during the reflow soldering process, the continuous pressing force provided by the elastic pin causes the top of the nut post to adhere to the surface of the solder pads on the printed circuit board.

[0006] In the above scheme, after the printed circuit board is placed on the fixture carrier, the end of each elastic pin is exactly located on the nut post on the IC driving surface of the corresponding printed circuit board. The elastic pin is subjected to the pressure of the printed circuit board and the nut post, and its end will press against the bottom of the nut post under the action of elastic pressure. By increasing the amount of solder when mounting the IC driving surface, when the lamp surface is mounted and reflow soldering is performed, the solder paste on the nut post of the IC driving surface melts, and the elastic pin uses its upward elastic force to flatten the nut post. This eliminates the need for additional soldering and straightening operations on the nut post after it comes out of the oven, which greatly improves production efficiency, reduces labor costs, and also improves the stability and consistency of product quality.

[0007] Furthermore, it also includes a pin carrier, at least one of the elastic pins is mounted on the pin carrier, and the pin carrier is connected to the fixture carrier.

[0008] In the above scheme, the elastic ejector pin is installed on the ejector pin carrier. When the elastic ejector pin is damaged, worn, or needs to be replaced with different specifications of elastic ejector pin according to different production needs, only the ejector pin carrier needs to be operated. There is no need to disassemble or adjust the entire fixture carrier. After the ejector pin carrier is connected to the fixture carrier, it can provide more precise positioning for the elastic ejector pin. The position and height of the elastic ejector pin can be controlled more conveniently through the ejector pin carrier, ensuring the accurate correspondence between the elastic ejector pin and the nut column, thereby improving the accuracy and quality of the nut column welding.

[0009] Furthermore, the ejector carrier includes a base plate and a mounting portion, the mounting portion being disposed on the base plate, the elastic ejector being connected to the mounting portion, and the base plate being connected to the fixture carrier.

[0010] In the above scheme, the base plate of the ejector carrier serves as the basic support and connection. The elastic ejector is connected to the mounting part to complete the initial installation of the elastic ejector on the ejector carrier. Then, the base plate of the ejector carrier is connected to the jig carrier to form a complete copper pillar jig structure, which makes the installation of the elastic ejector convenient and quick.

[0011] Furthermore, the elastic ejector pin includes a connecting sleeve, a spring, a guide rod, and a pushing part. The connecting sleeve is connected to the mounting part, the guide rod is disposed inside the connecting sleeve, the spring is sleeved on the outer periphery of the guide rod, and one end of the pushing part is pressed onto the spring and movably sleeved on the guide rod.

[0012] In the above scheme, when the printed circuit board is fixed on the fixture carrier, the nut post applies downward pressure to the push part. Under the action of this pressure, the push part moves downward along the guide rod and compresses the spring sleeved on the outer periphery of the guide rod. When the spring is compressed, it will produce elastic deformation, thereby generating an elastic force opposite to the compression direction. This elastic force is transmitted upward through the push part, so that the push part applies an upward pushing force to the bottom of the nut post. During the reflow soldering process, the solder paste at the nut post on the IC drive surface is heated and melted. At this time, the spring is continuously in a compressed state, providing a continuous and stable upward pushing force to the nut post through the push part. This pushing force pushes the nut post to move upward, causing the top of the nut post to fit tightly against the pad surface of the printed circuit board.

[0013] Furthermore, the outer wall of the connecting sleeve is provided with an external thread, the mounting part is provided with a groove, the inner wall of the groove is provided with an internal thread, and the internal thread is engaged with the external thread for connection.

[0014] In the above scheme, the mating method of the external and internal threads allows the connecting sleeve of the elastic ejector pin to be quickly positioned when connected to the mounting part of the ejector pin carrier. The operator only needs to align the connecting sleeve with the groove of the mounting part and rotate the connecting sleeve to make the external and internal threads gradually mesh and complete the connection. This connection method is simple to operate, requires no complicated tools and steps, greatly improves the installation efficiency of the elastic ejector pin, and saves production preparation time.

[0015] Furthermore, the base plate is provided with a plurality of connecting posts, which are connected to the fixture carrier.

[0016] In the above scheme, the connecting post can serve as a positioning reference. When installing the ejector pin carrier, its relative position with the fixture carrier can be accurately determined. This helps to ensure that the elastic ejector pin is precisely aligned with the nut post on the printed circuit board, so that the elastic ejector pin can accurately apply the ejector force to the nut post, thereby improving the positional accuracy of the nut post welding and the consistency of the welding quality.

[0017] Furthermore, the connecting post is provided with a connecting hole.

[0018] In the above scheme, the connecting hole can be used to fix the ejector carrier and the fixture carrier to each other by means of bolt connection. By passing the bolt through the connecting hole and screwing it into the corresponding screw hole on the fixture carrier, the connection between the two can be made tighter and more stable. This connection method is easy to disassemble and install. When the ejector carrier needs to be maintained, repaired or replaced, the ejector carrier and the fixture carrier can be easily separated by simply unscrewing the bolt. The operation is simple and quick, which can effectively shorten the downtime of the equipment and improve production efficiency.

[0019] Furthermore, the base plate is V-shaped or straight.

[0020] In the above scheme, the ejector pin carriers of V-shaped or straight base plates are selected according to the arrangement of the nut columns to avoid interference between the ejector pin carriers, thereby ensuring the positional accuracy of the nut columns during the reflow soldering process and improving the stability and consistency of the welding quality.

[0021] This utility model discloses a copper pillar dragging fixture for SMT (Surface Mount Technology) assembly, which improves the consistency and stability of soldering quality and enhances overall production quality. After placing the printed circuit board (PCB) on the fixture carrier, the end of each elastic pin is positioned precisely on the corresponding nut pillar on the IC driver surface of the PCB. The elastic pin undergoes elastic deformation under the pressure of the PCB and the nut pillar, and its end, under elastic pressure, presses upward against the bottom of the nut pillar. By increasing the amount of solder during IC driver surface assembly, the solder paste on the nut pillar melts during reflow soldering after the LED surface is assembled. The elastic pin uses its upward elastic force to flatten the nut pillar, eliminating the need for additional soldering and straightening operations after the nut pillar exits the reflow oven. This significantly improves production efficiency, reduces labor costs, and enhances the stability and consistency of product quality. Attached Figure Description

[0022] Figure 1 This is a perspective view of a jig carrier according to one embodiment.

[0023] Figure 2 This is a schematic diagram of the nut post and ejector carrier structure of one embodiment.

[0024] Figure 3 This is a schematic diagram of various ejector carrier structures in one embodiment.

[0025] Figure 4 This is a simplified schematic diagram of an embodiment of an elastic ejector pin.

[0026] Explanation of reference numerals in the attached figures: 1. Fixture carrier; 2. Elastic ejector pin; 21. Connecting sleeve; 22. Guide rod; 23. Pushing part; 3. Ejector pin carrier; 31. Base plate; 32. Connecting post; 321. Connecting hole; 33. Mounting part; 4. Nut post; 5. Printed circuit board. Detailed Implementation

[0027] The following will describe in further detail a copper pillar jig for SMT chip mounting, with reference to specific embodiments and accompanying drawings.

[0028] like Figures 1 to 3As shown in a preferred embodiment, a copper pillar jig for SMT assembly according to the present invention includes a jig carrier 1 and elastic pins 2. The jig carrier 1 is used to support and fix a printed circuit board 5. A plurality of elastic pins 2 are disposed on the jig carrier 1, and the positions of the elastic pins 2 correspond to the positions of the nut pillars 4 on the IC driving surface of the printed circuit board 5. When the printed circuit board 5 is fixed on the jig carrier 1, the ends of the elastic pins 2 press against the bottom of the nut pillars 4 under elastic pressure, so that when the solder paste melts during the reflow soldering process, the continuous pressing force provided by the elastic pins 2 causes the top of the nut pillars 4 to adhere to the pad surface of the printed circuit board 5. After the printed circuit board 5 is placed on the fixture carrier 1, the end of each elastic pin 2 is exactly located on the nut post 4 on the IC driving surface of the corresponding printed circuit board 5. The elastic pin 2 is subjected to the pressure of the printed circuit board 5 and the nut post 4 and undergoes elastic deformation. Its end will press upward against the bottom of the nut post 4 under the action of elastic pressure. By increasing the amount of solder when mounting the IC driving surface, when the lamp surface is mounted and reflow soldering is performed, the solder paste on the nut post 4 of the IC driving surface melts. The elastic pin 2 uses its upward elastic force to flatten the nut post 4, so that the nut post 4 after exiting the furnace does not need to be additionally soldered and straightened. This greatly improves production efficiency, reduces labor costs, and also improves the stability and consistency of product quality.

[0029] like Figure 1 and Figure 2 As shown, in some embodiments, a pin carrier 3 is also included, with at least one elastic pin 2 mounted on the pin carrier 3. The pin carrier 3 is connected to the fixture carrier 1. The elastic pin 2 is mounted on the pin carrier 3. When the elastic pin 2 is damaged, worn, or needs to be replaced with a different specification of elastic pin 2 according to different production requirements, only the pin carrier 3 needs to be operated; there is no need to disassemble or adjust the entire fixture carrier 1. After the pin carrier 3 is connected to the fixture carrier 1, it can provide more precise positioning for the elastic pin 2. The position and height of the elastic pin 2 can be more easily controlled through the pin carrier 3, ensuring accurate correspondence between the elastic pin 2 and the nut post 4, thereby improving the welding accuracy and quality of the nut post 4.

[0030] like Figure 2 and Figure 4 As shown, in some embodiments, the ejector carrier 3 includes a base plate 31 and a mounting part 33. The mounting part 33 is disposed on the base plate 31, and the elastic ejector 2 is connected to the mounting part 33. The base plate 31 is connected to the fixture carrier 1. The base plate 31 of the ejector carrier 3 serves as a basic support and connection. The connection between the elastic ejector 2 and the mounting part 33 completes the initial installation of the elastic ejector 2 on the ejector carrier 3. Then, the base plate 31 of the ejector carrier 3 is connected to the fixture carrier 1 to form a complete copper-drafting fixture structure, making the installation of the elastic ejector 2 convenient and quick.

[0031] like Figure 2 and Figure 4 As shown, in some embodiments, the elastic ejector pin 2 includes a connecting sleeve 21, a spring, a guide rod 22, and a pushing part 23. The connecting sleeve 21 is connected to the mounting part 33. The guide rod 22 is disposed inside the connecting sleeve 21. The spring is sleeved on the outer periphery of the guide rod 22. One end of the pushing part 23 is pressed on the spring and movably sleeved on the guide rod 22. When the printed circuit board 5 is fixed on the fixture carrier 1, the nut post 4 applies downward pressure to the push part 23. Under this pressure, the push part 23 moves downward along the guide rod 22 and compresses the spring sleeved on the outer periphery of the guide rod 22. When the spring is compressed, it will produce elastic deformation, thereby generating an elastic force opposite to the compression direction. This elastic force is transmitted upward through the push part 23, so that the push part 23 applies an upward pushing force to the bottom of the nut post 4. During the reflow soldering process, the solder paste at the nut post 4 on the IC driving surface is heated and melted. At this time, the spring is continuously compressed, and the push part 23 provides a continuous and stable upward pushing force to the nut post 4. This pushing force pushes the nut post 4 to move upward, causing the top of the nut post 4 to fit tightly against the pad surface of the printed circuit board 5.

[0032] like Figure 4 As shown, in some embodiments, the outer wall of the connecting sleeve 21 is provided with external threads, and the mounting part 33 is provided with a groove. The inner wall of the groove is provided with internal threads, and the internal threads and external threads are engaged for connection. The engagement of the external and internal threads allows the connecting sleeve 21 of the elastic ejector pin 2 to be quickly positioned when connected to the mounting part 33 of the ejector pin carrier 3. The operator only needs to align the connecting sleeve 21 with the groove of the mounting part 33 and rotate the connecting sleeve 21 to gradually engage the external and internal threads, thus completing the connection. This connection method is simple to operate, requires no complicated tools or steps, greatly improves the installation efficiency of the elastic ejector pin 2, and saves production preparation time.

[0033] like Figure 2 As shown, in some embodiments, the base plate 31 is provided with a plurality of connecting posts 32, which are connected to the fixture carrier 1. The connecting posts 32 can serve as positioning references, and when installing the ejector pin carrier 3, their relative positions with the fixture carrier 1 can be accurately determined. This helps to ensure that the elastic ejector pin 2 is precisely aligned with the nut post 4 on the printed circuit board 5, so that the elastic ejector pin 2 can accurately apply the ejector force to the nut post 4, thereby improving the positional accuracy and welding quality consistency of the nut post 4.

[0034] like Figure 3As shown, in some embodiments, the connecting column 32 is provided with a connecting hole 321. The connecting hole 321 can be used to fix the ejector carrier 3 and the fixture carrier 1 to each other by means of bolt connection. By passing the bolt through the connecting hole 321 and screwing it into the corresponding screw hole on the fixture carrier 1, the connection between the two can be made tighter and more stable. This connection method is convenient for disassembly and installation. When it is necessary to maintain, repair or replace the ejector carrier 3, the ejector carrier 3 and the fixture carrier 1 can be easily separated by simply unscrewing the bolt. The operation is simple and quick, which can effectively shorten the downtime of the equipment and improve production efficiency.

[0035] like Figure 3 As shown, in some embodiments, the base plate 31 is V-shaped or straight. The ejector carrier 3 of the V-shaped or straight base plate 31 is selected according to the arrangement of the nut posts 4 to avoid interference between the ejector carriers 3, thereby ensuring the positional accuracy of the nut posts 4 during reflow soldering and improving the stability and consistency of the welding quality.

[0036] In this embodiment, when the base plate 31 is V-shaped, the elastic pin 2 is installed at the middle end, and the two connecting posts 32 are located at both ends. When the base plate 31 is straight, the elastic pin 2 is located between the two connecting posts 32 or on one side of the two connecting posts 32 to ensure the stability of the elastic pin 2.

[0037] This utility model discloses the working principle and process of a copper pillar jig for SMT (Surface Mount Technology) assembly. A printed circuit board (PCB) 5 is placed on a jig carrier 1 for precise support and fixation, ensuring stable positioning and preventing displacement or shaking during subsequent operations. Multiple elastic pins 2 are connected to the jig carrier 1 via a pin carrier 3. The positions of the elastic pins 2 precisely correspond to the positions of the nut pillars 4 on the IC driving surface of the PCB 5. The elastic pins 2 are elastic; after the PCB 5 is placed on the jig carrier 1, they undergo elastic deformation under the pressure of the PCB and the nut pillars 4. Their ends, under elastic pressure, press upward against the bottom of the nut pillar 4. After SMT assembly, the PCB enters the reflow soldering stage. During reflow soldering, the solder paste at the nut pillar 4 on the IC driving surface melts, and the elastic pins 2 continuously provide upward force, pushing the nut pillar 4 upward and causing its top to tightly adhere to the pad surface of the PCB 5. As the solder paste cools and solidifies, the nut pillar 4 is firmly soldered to the pad.

[0038] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A copper pillar dragging fixture for SMT chip mounting, characterized in that, include: Fixture carrier, used to support and fix printed circuit boards; Elastic ejector pins, a plurality of elastic ejector pins are disposed on the fixture carrier, and the positions of the elastic ejector pins correspond to the positions of the nut posts on the IC driving surface of the printed circuit board. When the printed circuit board is fixed on the fixture carrier, the end of the elastic pin presses upward against the bottom of the nut post under elastic pressure, so that when the solder paste melts during the reflow soldering process, the continuous pressing force provided by the elastic pin causes the top of the nut post to adhere to the surface of the solder pads on the printed circuit board.

2. The copper pillar jig for SMT placement according to claim 1, characterized in that, It also includes a pin carrier, at least one of the elastic pins is mounted on the pin carrier, and the pin carrier is connected to the fixture carrier.

3. The copper pillar jig for SMT placement according to claim 2, characterized in that, The ejector carrier includes a base plate and a mounting part. The mounting part is disposed on the base plate, the elastic ejector is connected to the mounting part, and the base plate is connected to the fixture carrier.

4. The copper pillar jig for SMT placement according to claim 3, characterized in that, The elastic ejector pin includes a connecting sleeve, a spring, a guide rod, and a pushing part. The connecting sleeve is connected to the mounting part. The guide rod is disposed inside the connecting sleeve. The spring is sleeved on the outer periphery of the guide rod. One end of the pushing part is pressed onto the spring and movably sleeved on the guide rod.

5. The copper pillar jig for SMT placement according to claim 4, characterized in that, The outer wall of the connecting sleeve is provided with an external thread, the mounting part is provided with a groove, the inner wall of the groove is provided with an internal thread, and the internal thread is engaged with the external thread for connection.

6. The copper pillar jig for SMT placement according to claim 3, characterized in that, The base plate is provided with a plurality of connecting columns, which are connected to the fixture carrier.

7. The copper pillar jig for SMT placement according to claim 6, characterized in that, The connecting column is provided with a connecting hole.

8. The copper pillar jig for SMT placement according to claim 3, characterized in that, The base plate is V-shaped or straight.

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