Solder ball screening device

Abstract

The utility model relates to a solder ball screening device which comprises a screening mechanism, the screening mechanism comprises a motor, a belt wheel is rotationally connected to the motor, a belt is slidably connected to the belt wheel, an eccentric wheel is fixedly connected to the end, away from the motor, of the belt wheel, and the eccentric wheel is rotationally connected with a screening frame. Four trapezoidal grooves are formed in the inner wall of the screening frame, and a first screen and a second screen are slidably connected into the screening frame. The tin ball screening device has the beneficial effects that the eccentric wheel is matched with the screening frame and other structures, tin balls can be rapidly screened, meanwhile, the tin balls can be subjected to multi-stage screening through the large screening holes in the first screening net and the small screening holes in the second screening net, the screening efficiency can be further improved, and the screening efficiency is improved. And meanwhile, the tin balls of different specifications can be screened and packaged, and the situation that the tin balls with the small hardness deform in the screening process can be avoided by arranging an anti-collision pad.

Description

Technical Field

[0001] The present utility model relates to the field of solder ball production, and specifically to a solder ball screening device. Background Technique

[0002] Solder balls are essential raw materials for BGA and CSP equipment used in the packaging and soldering of large-scale integrated circuit semiconductor chips in the current international microelectronics industry. Most of its production processes involve melting tin into tin liquid, spraying it into granules, and then further processing it into finished solder balls. After the solder balls are formed, due to errors or other factors generated during the production process, some solder balls cannot meet the requirements in terms of roundness and sphericity accuracy. Therefore, it is necessary to screen the solder balls.

[0003] Currently, the screening and packaging of BGA solder balls mainly adopt roller screening and manual screening: among them, roller screening uses two rollers for ball diameter screening, and the distance between the rollers is adjusted according to the size of the solder ball diameter to be screened. The defect of using this method to screen the ball diameter is that the processing accuracy requirements for the length of the rollers are high, and its error increases with the increase in the length of the rollers. Moreover, roller screening is greatly affected by environmental temperature and humidity, and the rollers are prone to flatten the solder balls when rolling, thus forming defective solder balls; while manual screening uses a precision mesh screen for ball diameter screening, and the control of the ball diameter is mainly achieved by using mesh screens with different apertures. Manual screening requires a lot of labor, and it is difficult to control by different operators, and the screening efficiency is low. Repeated re-screening is prone to cause oxidation of the solder balls; therefore, improvement is needed. Summary of the Invention

[0004] The present utility model aims at the technical problems existing in the prior art and provides a solder ball screening device.

[0005] The technical solution for the present utility model to solve the above technical problems is as follows: A solder ball screening device includes a screening mechanism, a fixing mechanism is arranged on the screening mechanism, and a main body mechanism is arranged inside the screening mechanism;

[0006] The screening mechanism includes a motor, a pulley is rotatably connected to the motor, a belt is slidably connected to the pulley, an eccentric wheel is fixedly connected to the end of the pulley away from the motor, the eccentric wheel is rotatably connected to a screening frame, four trapezoidal grooves are opened on the inner wall of the screening frame, a first screen and a second screen are slidably connected inside the screening frame, trapezoidal blocks are fixedly connected to both sides of the first screen, a plurality of large screen holes are uniformly opened on the first screen, a plurality of small screen holes are uniformly opened on the second screen, anti-collision pads are fixedly connected to the tops of the first screen and the second screen, two baffles are fixedly connected inside the screening frame, and fixing holes are fixedly connected to all four trapezoidal blocks.

[0007] Preferably, there are four pulley wheels, and there are two belts. Two of the pulley wheels are respectively slidably connected to the inner parts of the two belts. The size of the trapezoidal block is adapted to the size of the trapezoidal groove, and the trapezoidal block is slidably connected to the trapezoidal groove. The size of the large sieve holes is larger than that of the small sieve holes. The two baffles are respectively located at the lower right of the first screen and the second screen.

[0008] Preferably, the fixing mechanism includes a handle. A clamping block is fixedly connected to the bottom of the handle, and a spring is fixedly connected to the top of the clamping block.

[0009] Preferably, the clamping block is elastically connected to the inner wall of the screening frame through the spring. The bottom of the clamping block penetrates through the inner wall of the screening frame and extends into the trapezoidal groove. The size of the clamping block is adapted to the size of the fixing hole, and the clamping block is clamped with the fixing hole. The screening frame is located inside the four handles.

[0010] Preferably, the main body mechanism includes a main body housing. A feeding frame is fixedly connected to the top of the main body housing. A number of feeding holes are evenly opened at the bottom of the feeding frame. A ball shooting system is fixedly connected to the top of the feeding frame. A fixing plate is fixedly connected to the front of the main body housing.

[0011] Preferably, a fixing connection is made between the top of the fixing plate and the bottom of the motor. The screening frame is slidably connected to the inner wall of the handle. The pulley wheel is rotatably connected to the main body housing.

[0012] Preferably, the main body housing is located between the four pulley wheels. The feeding frame and the ball shooting system are located at the upper left of the screening frame. The feeding holes are located above the first screen, and the size of the feeding holes is larger than that of the large sieve holes.

[0013] The beneficial effect of the utility model is that the eccentric wheel, the screening frame and other structures are arranged in coordination, so that the solder balls can be quickly screened. The motor is started to rotate the pulley connected to the motor. The rotation of the pulley drives another pulley to rotate through the transmission of the belt, thereby driving the eccentric wheel to rotate eccentrically with the pulley as the center, thereby driving the screening frame connected to the rotation of the eccentric wheel to vibrate inside the main body shell. Because the screening frame is tilted as a whole, the solder balls on the first screen can roll to the lower right along the surface of the first screen under the action of vibration and gravity, so that the solder balls with a size larger than the large screen hole can directly roll along the second screen into the funnel at the lower right of the first screen, while the solder balls with a size smaller than the large screen hole but larger than the small screen hole can be directly rolled down to the funnel at the lower right of the first screen. The solder balls with specifications smaller than the small holes will first pass through the large holes on the first sieve and fall onto the top of the second sieve, and roll along the surface of the second sieve into the funnel between the two baffles. The solder balls with specifications smaller than the small holes will successively pass through the large holes on the first sieve and the small holes on the second sieve, and fall into the funnel below the second sieve. After being screened by the first and second sieves, the screening efficiency can be improved through multi-stage screening, and solder balls of different specifications can be screened and packaged at the same time. The anti-collision pad can prevent the deformation of solder balls with lower hardness during the screening process, and the sieve plate can be quickly replaced by pulling the handle to adapt to the different standards for solder ball classification and screening of different companies. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the cross-sectional structure of the practical screening mechanism;

[0016] Figure 3 This is a schematic diagram of the structural relationship between the practical clamping block and the fixing hole;

[0017] Figure 4 This is a top view schematic diagram of the practical screening mechanism;

[0018] Figure 5 This is a schematic diagram of the structural relationship between the trapezoidal blocks and trapezoidal slots in this application.

[0019] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0020] 1. Screening mechanism; 101. Motor; 102. Pulley; 103. Belt; 104. Eccentric wheel; 105. Screening frame; 106. Trapezoidal groove; 107. Trapezoidal block; 108. First sieve; 109. Large sieve holes; 110. Second sieve; 111. Small sieve holes; 112. Anti-collision pad; 113. Baffle; 114. Fixing hole; 2. Fixing mechanism; 201. Handle; 202. Spring; 203. Clamping block; 3. Main body mechanism; 301. Main body housing; 302. Feeding frame; 303. Feeding hole; 304. Ball shooting system; 305. Fixed plate. Detailed implementation manners

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0022] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0023] In the description of the present application, the term "for example" is used to mean "serving as an example, illustration, or explanation". Any embodiment described as "for example" in the present application is not necessarily construed as being more preferred or having more advantages than other embodiments. In order for any person skilled in the art to implement and use the present application, the following description is given. In the following description, details are set forth for purposes of explanation. It should be understood that those skilled in the art can recognize that the present application can be implemented without using these specific details. In other instances, well-known structures and processes are not elaborated in detail to avoid unnecessary details from obscuring the description of the present application. Therefore, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

[0024] Embodiment 1

[0025] Please refer to Figures 2 to 5 , which includes a screening mechanism 1, a fixing mechanism 2 is arranged on the screening mechanism 1, and a main body mechanism 3 is arranged inside the screening mechanism 1;

[0026] The screening mechanism 1 includes a motor 101. A pulley 102 is rotatably connected to the motor 101. A belt 103 is slidably connected to the pulley 102. An eccentric wheel 104 is fixedly connected to the end of the pulley 102 away from the motor 101. The eccentric wheel 104 is rotatably connected to a screening frame 105. Four trapezoidal grooves 106 are formed in the inner wall of the screening frame 105. A first screen 108 and a second screen 110 are slidably connected inside the screening frame 105. Trapezoidal blocks 107 are fixedly connected to both sides of the first screen 108. A number of large screening holes 109 are evenly formed in the first screen 108. A number of small screening holes 111 are evenly formed in the second screen 110. Anti-collision pads 112 are fixedly connected to the tops of the first screen 108 and the second screen 110. Two baffles 113 are fixedly connected inside the screening frame 105. Fixed holes 114 are fixedly connected to all four trapezoidal blocks 107.

[0027] There are four pulleys 102 and two belts 103. Two of the pulleys 102 are respectively slidably connected inside the two belts 103. The size of the trapezoidal block 107 is adapted to the size of the trapezoidal groove 106. The trapezoidal block 107 is slidably connected to the trapezoidal groove 106. The size of the large screening hole 109 is larger than the size of the small screening hole 111. The two baffles 113 are respectively located right below the first screen 108 and the second screen 110.

[0028] As Figure 2 shown, Figure 2The direction close to the first sieve 108 of the icon is the left side, and the direction close to the blanking frame 302 of the icon is the upper side. By setting up the cooperation of structures such as the eccentric wheel 104 and the screening frame 105, it is convenient to quickly screen the solder balls. Start the motor 101 to make the pulley 102 rotationally connected to the motor 101 rotate. The rotation of the pulley 102 will drive the rotation of another pulley 102 through the transmission of the belt 103, thereby driving the eccentric wheel 104 to eccentrically rotate around the pulley 102, and then driving the screening frame 105 rotationally connected to the eccentric wheel 104 to vibrate inside the main body housing 301. Also, because the screening frame 105 is integrally inclined, the solder balls on the first sieve 108 can roll right downward along the surface of the first sieve 108 under the action of vibration and gravity, so that the solder balls with a size larger than the large sieve holes 109 directly roll into the funnel right below the first sieve 108 along the second sieve 110. For the solder balls with a size smaller than the large sieve holes 109 but larger than the small sieve holes 111, they first pass through the large sieve holes 109 on the first sieve 108 and fall above the second sieve 110, and then roll into the funnel between the two baffles 113 along the surface of the second sieve 110. And the solder balls with a size smaller than the small sieve holes 111 will successively pass through the large sieve holes 109 on the first sieve 108 and the small sieve holes 111 on the second sieve 110 and fall into the funnel below the second sieve 110. After screening by the first sieve 108 and the second sieve 110, multi-stage screening can improve the screening efficiency, and at the same time, it can also screen and package solder balls of different specifications. And setting the anti-collision pad 112 can avoid the situation that the relatively soft solder balls are deformed during the screening process.

[0029] Embodiment 2

[0030] As Figures 1 to 3 shown; The fixing mechanism 2 includes a handle 201. The bottom of the handle 201 is fixedly connected with a clamping block 203. The top of the clamping block 203 is fixedly connected with a spring 202. The clamping block 203 is elastically connected to the inner wall of the screening frame 105 through the spring 202. The bottom of the clamping block 203 penetrates the inner wall of the screening frame 105 and extends into the trapezoidal groove 106. The size of the clamping block 203 is adapted to the size of the fixing hole 114. The clamping block 203 is clamped with the fixing hole 114. The screening frame 105 is located inside the four handles 201.

[0031] The main body mechanism 3 includes a main body housing 301. The top of the main body housing 301 is fixedly connected with a blanking frame 302. A plurality of blanking holes 303 are evenly opened at the bottom of the blanking frame 302. The top of the blanking frame 302 is fixedly connected with a ball shooting system 304. The front of the main body housing 301 is fixedly connected with a fixing plate 305.

[0032] The top of the fixed plate 305 is fixedly connected to the bottom of the motor 101. The screening frame 105 is slidably connected to the inner wall of the handle 201. The pulley 102 is rotatably connected to the main body housing 301. The main body housing 301 is located between the four pulleys 102. The blanking frame 302 and the ball shooting system 304 are located in the upper left of the screening frame 105. The blanking hole 303 is located above the first screen 108. The size of the blanking hole 303 is larger than that of the large sieve hole 109.

[0033] By pulling the handle 201 away from the screening frame 105, the handle 201 drives the latch 203 to move away from the trapezoidal block 107 and compresses the spring 202, so that the clamping connection between the latch 203 and the fixing hole 114 on the trapezoidal block 107 is released. Then the sieve plate is taken out and replaced. Align the trapezoidal block 107 on the new sieve plate with the trapezoidal groove 106 and insert it into the trapezoidal groove 106. At this time, the fixing hole 114 on the trapezoidal block 107 is aligned with the latch 203. Then release the handle 201 so that the latch 203 is clamped with the fixing hole 114 under the action of the elastic force of the spring 202, and the sieve plate can be quickly replaced to meet the different standards of different companies for the classification and screening of tin balls.

[0034] The working principle and usage process of the present utility model:

[0035] First, place funnels respectively below the second screen 110, between the two baffles 113, and in the lower right of the first screen 108. Set conveyors below the funnels. There are three rows of packaging bags on the conveyors for packaging three different specifications of tin balls respectively. Set heat shrink packaging machines and argon filling machines on both sides of the conveyors to seal the packaged tin balls.

[0036] Then, the produced tin balls are launched into the interior of the blanking frame 302 through the ball shooting system 304. After decelerating in the blanking frame 302, they pass through the uniformly opened blanking holes 303 at the bottom of the blanking frame 302 and fall to the upper left of the first sieve 108. At the same time, the motor 101 is started to make the pulley 102 rotationally connected to the motor 101 rotate. The rotation of the pulley 102 drives the rotation of another pulley 102 through the transmission of the belt 103, thereby driving the eccentric wheel 104 to rotate eccentrically with the pulley 102 as the center, and then driving the screening frame 105 rotationally connected to the eccentric wheel 104 to vibrate inside the main body housing 301. Also, because the screening frame 105 is inclined as a whole, the tin balls on the first sieve 108 can roll downward to the right along the surface of the first sieve 108 under the action of vibration and gravity. The tin balls with a size larger than the large sieve holes 109 roll directly into the funnel below the right of the first sieve 108 along the second sieve 110. The tin balls with a size smaller than the large sieve holes 109 but larger than the small sieve holes 111 first pass through the large sieve holes 109 on the first sieve 108 and fall above the second sieve 110, and then roll into the funnel between the two baffles 113 along the surface of the second sieve 110. The tin balls with a size smaller than the small sieve holes 111 will successively pass through the large sieve holes 109 on the first sieve 108 and the small sieve holes 111 on the second sieve 110 and fall into the funnel below the second sieve 110. After screening by the first sieve 108 and the second sieve 110, the tin balls produced by the ball shooting system 304 are classified by size and respectively fall into the packaging bags, and then the packaging can be completed through the heat shrink packaging machine and the argon gas filling machine;

[0037] When it is necessary to adjust the aperture size of the sieve plate according to different classification criteria required by the company, the handle 201 can be pulled in the direction away from the screening frame 105, so that the handle 201 drives the block 203 to move in the direction away from the trapezoidal block 107 and compresses the spring 202, so that the clamping connection between the block 203 and the fixing hole 114 on the trapezoidal block 107 is released. Then, the sieve plate is taken out and replaced. The trapezoidal block 107 on the new sieve plate is aligned with the trapezoidal groove 106 and inserted into it. At this time, the fixing hole 114 on the trapezoidal block 107 is aligned with the block 203. Then, the handle 201 is released, and the block 203 is clamped with the fixing hole 114 under the action of the elastic force of the spring 202, and the replacement of the sieve plate can be completed.

[0038] It should be noted that in the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0039] Although the preferred embodiments of the present utility have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concepts. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications that fall within the scope of the present utility.

[0040] Obviously, those skilled in the art can make various changes and modifications to the present utility without departing from the spirit and scope of the present utility. Thus, if these modifications and variations of the present utility fall within the scope of the claims of the present utility and their equivalent technologies, the present utility is also intended to include these modifications and variations.

Claims

1. A solder ball screening device, characterized in that: It comprises a screening mechanism (1), a fixing mechanism (2) is arranged on the screening mechanism (1), and a main body mechanism (3) is arranged inside the screening mechanism (1); The screening mechanism (1) comprises a motor (101), a pulley (102) is rotatably connected to the motor (101), a belt (103) is slidably connected to the pulley (102), an eccentric wheel (104) is fixedly connected to one end of the pulley (102) away from the motor (101), the eccentric wheel (104) is rotatably connected to a screening frame (105), four trapezoidal grooves (106) are formed on the inner wall of the screening frame (105), and a first screen (108) and a second screen are slidably connected inside the screening frame (105). (110), both sides of the first screen (108) are fixedly connected with trapezoidal blocks (107), a plurality of large screen holes (109) are evenly opened on the first screen (108), a plurality of small screen holes (111) are evenly opened on the second screen (110), anti-collision pads (112) are fixedly connected to the tops of the first screen (108) and the second screen (110), two baffles (113) are fixedly connected inside the screening frame (105), and fixing holes (114) are fixedly connected to the four trapezoidal blocks (107).

2. The solder ball screening device according to claim 1, characterized in that; There are four pulleys (102) and two belts (103). The two pulleys (102) are slidably connected inside the two belts (103), the size of the trapezoidal block (107) matches the size of the trapezoidal groove (106), the trapezoidal block (107) is slidably connected to the trapezoidal groove (106), the size of the large sieve hole (109) is larger than the size of the small sieve hole (111), and the two baffles (113) are respectively located at the lower right of the first sieve (108) and the second sieve (110).

3. The solder ball screening device according to claim 1, characterized in that; The fixing mechanism (2) comprises a handle (201), the bottom of the handle (201) is fixedly connected to a clamping block (203), and the top of the clamping block (203) is fixedly connected to a spring (202).

4. The solder ball screening device according to claim 3, characterized in that: The clamping block (203) is elastically connected to the inner wall of the screening frame (105) via a spring (202); the bottom of the clamping block (203) penetrates the inner wall of the screening frame (105) and extends to the inside of the trapezoidal groove (106); the size of the clamping block (203) matches the size of the fixing hole (114); the clamping block (203) is clamped with the fixing hole (114); and the screening frame (105) is located inside the four handles (201).

5. The solder ball screening device according to claim 3, characterized in that: The main body mechanism (3) comprises a main body shell (301), the top of the main body shell (301) is fixedly connected to a feeding frame (302), the bottom of the feeding frame (302) is evenly provided with a plurality of feeding holes (303), the top of the feeding frame (302) is fixedly connected to a ball shooting system (304), and the front of the main body shell (301) is fixedly connected to a fixing plate (305).

6. The solder ball screening device according to claim 5, characterized in that: The top of the fixed plate (305) is fixedly connected to the bottom of the motor (101), the screening frame (105) is slidably connected to the inner wall of the handle (201), and the pulley (102) is rotationally connected to the main body shell (301).

7. The solder ball screening device according to claim 6, characterized in that: The main body shell (301) is located between the four pulleys (102), the unloading frame (302) and the ball shooting system (304) are located on the upper left of the screening frame (105), the unloading hole (303) is located above the first sieve (108), and the size of the unloading hole (303) is larger than the size of the large sieve hole (109).

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