A non-contact laser welding device

Abstract

The present invention provides a non-contact laser welding device, including a laser welder and a solder ball feeding mechanism; the solder ball feeding mechanism includes a turntable, a chassis, a storage barrel and a feeding pipe; the chassis supports the turntable, the turntable is driven by a dividing device and rotates intermittently, a plurality of feeding holes are distributed along a circumference on the turntable, and a discharge hole adapted to the feed hole is provided on the chassis, and the feed hole on the turntable can be rotated to the top of the discharge hole in turn to feed the solder balls into the discharge hole one by one; the storage barrel is located above the turntable, including a funnel-shaped feeding barrel and a flat feeding barrel, and two feeding ports are respectively provided at both ends of the bottom of the feeding barrel, and the spacing between the two feeding ports is equal to the spacing between two adjacent feeding holes; the bottom of the feeding barrel is provided with a slope for auxiliary feeding; a feeding channel connected to the discharge hole is provided in the feeding pipe, and the bottom of the feeding pipe extends into the welding head of the laser welder. The present invention can solve the problem of poor feeding and feeding failure caused by disorderly accumulation of solder balls.

Description

Technical Field

[0001] The invention belongs to the technical field of laser welding, and in particular relates to a non-contact laser welding device. Background Art

[0002] The welding of electronic components usually adopts SMT welding and wire feeding welding. Among them, the surface of the pad of the electronic component welded by SMT welding is easy to oxidize, and in the flux with rosin added to resist oxidation, the rosin volatilizes during use and has a certain degree of corrosiveness to precision electronic components. Wire feeding welding is continuous welding, and the flux is easy to flow on the welding surface, making it difficult to accurately control the solder joints.

[0003] Ball spray laser welding is a non-contact welding method. In some working conditions, it uses solder balls to replace SMT welding and wire feeding welding to weld workpieces. In existing ball spray laser welding devices, the solder ball feeding tube adopts a funnel shape. The solder balls automatically slide down into the feeding tube under the action of gravity. The solder balls in this feeding tube are easily squeezed and accumulated, resulting in poor feeding or empty material.

[0004] Patent document with application number CN201410460637.9 discloses a solder ball welding device, which makes it difficult for solder balls to get stuck during injection. However, the device implants solder balls by setting a circle of separation holes on the edge of the solder ball separation component. During the rotation of the solder ball separation component, the solder balls may still be thrown out of the separation holes due to centrifugal force, so the possibility of implantation failure is relatively high; and its structure is complex and bloated, with many driving mechanisms, which is not conducive to popularization and use. Summary of the invention

[0005] The object of the present invention is to provide a non-contact laser welding device to solve the problem of poor feeding and feeding failure caused by disorderly accumulation of solder balls in the laser welding device.

[0006] The present invention provides the following technical solutions:

[0007] A non-contact laser welding device comprises a laser welder and a solder ball feeding mechanism;

[0008] The solder ball feeding mechanism is located at the side of the welding head of the laser welder, and the solder ball feeding mechanism includes a turntable, a bottom plate, a storage cylinder and a feeding pipe;

[0009] The chassis is fixedly installed and supports the turntable, the turntable is driven by the indexing device to rotate intermittently, a plurality of feed holes are distributed on the turntable along a circle co-centered with the turntable, and a discharge hole adapted to the feed hole is provided on the chassis, and the feed holes on the turntable can be rotated to the top of the discharge hole in turn to feed the solder balls into the discharge hole one by one;

[0010] The material storage barrel is fixedly installed and located above the turntable. The material storage barrel includes a funnel-shaped feeding barrel and a flat feeding barrel connected in sequence from top to bottom. The feeding barrel covers two feeding holes along its flat direction. Two feeding ports are respectively provided at the two ends of the bottom of the feeding barrel along its flat direction. The spacing between the two feeding ports is equal to the spacing between two adjacent feeding holes. The bottom of the feeding barrel is also provided with a slope for auxiliary feeding, and the two ends of the slope extend toward the direction of the two feeding ports respectively.

[0011] The feed pipe is installed at the bottom of the chassis. A feed channel connected to the discharge hole and inclined downward is provided in the feed pipe. The bottom of the feed pipe extends into the welding head of the laser welder.

[0012] Furthermore, an optional solution for the slope is: the slope is integrally formed with the feeding barrel, and the high and low ends of the slope extend to the edges of the two feeding ports respectively.

[0013] Preferably, the relationship between the inclination direction of the slope and the direction of the turntable is: the turntable rotates from the feeding port corresponding to the lower end of the slope to the feeding port corresponding to the higher end of the slope.

[0014] Another optional scheme for the slope is: a material shifting block horizontally supported by a rotating shaft is installed at the bottom of the feeding barrel, and the material shifting block can swing in the feeding barrel; the slope is provided on the top of the material shifting block, and the slope is an arched surface with its two ends respectively bending toward two feeding ports.

[0015] Preferably, a plurality of racks are installed on the turntable, the end of the rotating shaft of the material shifting block extends out of the feeding barrel and is keyed to a sector gear, the sector gear is meshed with the rack, and the rack can drive the sector gear to rotate.

[0016] Preferably, the longitudinal sections of the rack and the sector gear are both arc-shaped, and the plurality of racks are evenly distributed on the same circumference that is co-centered with the turntable.

[0017] Furthermore, a counterweight is installed on the sector gear, and the counterweight is located on a side of the sector gear that is away from the rack.

[0018] Furthermore, the bottom of the feeding barrel is formed with limit blocks at both ends of the material shifting block, and a movable gap is left between one side wall of the limit block and the material shifting block for the material shifting block to swing, and the other side wall of the limit block is the hole wall of the feeding port.

[0019] Preferably, the bottom of the material-shifting block is in an arch shape with both ends rising upward, and the bottom of the material-shifting block is suspended in the air.

[0020] The beneficial effects of the present invention are:

[0021] The present invention is used to spray solder balls on a laser welder to achieve non-contact welding of workpieces. The solder ball feeding mechanism of the device includes a turntable, a chassis, a storage barrel and a feeding tube. The storage barrel is located above the turntable. Its flat feeding barrel can automatically and orderly arrange the solder balls into a row, and then feed the solder balls into the feeding holes of the turntable through the feeding port at the bottom thereof, so as to avoid the problem that the solder balls are disorderly piled and squeezed in the funnel-shaped feeding barrel and cannot be discharged smoothly, causing the feeding action to fail. The slope at the bottom of the feeding barrel further promotes the solder balls to roll flexibly toward the feeding port to ensure the effectiveness of the feeding action.

[0022] The turntable can intermittently rotate relative to the bottom plate, so that two adjacent feed holes on the turntable can correspond to two feed ports in the storage barrel one by one, thereby receiving the solder balls discharged from the storage barrel. Among them, the device is provided with two feed ports. When the feeding in one feed hole fails, after the next rotation of the turntable, the empty feed hole just moves to the bottom of the second feed port to receive the solder balls, thereby further effectively reducing the phenomenon of feeding failure.

[0023] The present invention installs a swayable material-pickling block in the feeding barrel, installs a sector gear at the end of the rotating shaft of the material-pickling block, and installs a rack meshing with the sector gear on the turntable. When the turntable rotates, the rack drives the sector gear to sway slightly, thereby moving the solder balls in the storage barrel so that they can smoothly roll into the feeding port, avoiding the problem of feeding jamming caused by gravity and mutual squeezing of the solder balls. The material-pickling block of the present invention does not have an additional driving mechanism, but cleverly uses the rotation of the turntable to synchronously drive the material-pickling block to sway, thereby reducing the number of driving parts, making the structure of the device more compact, and reducing the driving energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 It is a schematic diagram of the top view of the structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the connection structure between the welding head and the feeding pipe of the present invention;

[0027] Figure 3 Schematic diagram of the internal structure of the storage barrel of Example 1 of the present invention;

[0028] Figure 4 is a schematic diagram of a top view of the solder ball feeding mechanism of embodiment 3 of the present invention;

[0029] Figure 5 It is a schematic diagram of the structure when the material shifting block inside the material storage barrel of Examples 2 and 3 of the present invention is in a balanced state;

[0030] Figure 6 It is a structural schematic diagram of the action process of the material shifting block inside the material storage barrel of embodiments 2 and 3 of the present invention;

[0031] Figure 7 is a schematic diagram of the matching structure of the rack and the sector gear of Example 3 of the present invention;

[0032] Figure 8 is a schematic diagram of the cross-sectional structure inside the storage barrel of Example 3 of the present invention;

[0033] Fig. 9 It is another schematic diagram of the cross-sectional structure inside the storage barrel of Example 3 of the present invention.

[0034] Markings in the figure are: 10. Laser welder; 11. Welding head; 20. Solder ball feeding mechanism; 21. Turntable; 211. Feed hole; 22. Chassis; 221. Discharge hole; 23. Feed barrel; 24. Feed barrel; 241. Feed port; 242. Slope; 243. Rotating shaft; 244. Diverter block; 245. Limit block; 246. Movable gap; 25. Feeding pipe; 251. Feeding channel; 26. Fan gear; 27. Rack; 28. Counterweight; 30. Solder ball. DETAILED DESCRIPTION

[0035] Example 1

[0036] like Figure 1 As shown, a non-contact laser welding device includes a laser welder 10 and a solder ball feeding mechanism 20.

[0037] The solder ball feeding mechanism 20 is located at the side of the welding head 11 of the laser welder 10 . The solder ball feeding mechanism 20 includes a turntable 21 , a bottom plate 22 , a storage cylinder and a feeding tube 25 .

[0038] like Figures 1 to 3 As shown, the chassis 22 is fixedly mounted on the frame, and the chassis 22 can support the turntable 21 horizontally. The turntable 21 is driven by a dividing device to rotate intermittently. A plurality of feed holes 211 are distributed on the turntable 21 along a circumference co-centered with the turntable to receive solder balls 30 provided from the storage barrel. The solder balls 30 can be made of materials such as steel balls and tin balls. The diameter of the solder balls is 0.53-0.55 mm, which is slightly larger than the aperture of the welding head injection hole. A discharge hole 221 adapted to the feed hole 211 is provided on the chassis 22. The feed holes 211 on the turntable 21 can be rotated to the top of the discharge hole 221 in turn to feed the solder balls 30 one by one into the discharge hole 221, and then the solder balls 30 are fed into the welding head 11 by the feeding pipe 25 installed under the chassis 22.

[0039] The storage barrel is fixedly mounted on a bracket and is located above the rotating disk 21. Figure 3 and Fig. 9 As shown, the storage cylinder includes a funnel-shaped feeding cylinder 23 and a flat feeding cylinder 24 connected in sequence from top to bottom, and solder balls can be fed into the feeding cylinder 23 from the top. The feeding cylinder 24 covers two feeding holes along its flat direction, and two feeding ports 241 are respectively provided at both ends of the bottom of the feeding cylinder 24 along its flat direction. The spacing between the two feeding ports 241 is equal to the spacing between two adjacent feeding holes 211, so that the two feeding ports 241 can feed the two feeding holes 211 at the same time. When there is a solder ball in the feeding hole and it is blocked, the corresponding feeding port will not feed in this beat.

[0040] like Figure 3 As shown, the bottom of the feeding barrel 24 is also provided with a slope 242 for auxiliary feeding. The slope 242 is integrally formed with the feeding barrel 24, and the high and low ends of the slope 242 extend to the edges of the two feeding ports 241 respectively. The inclined slope structure helps the solder balls to roll quickly into the feeding ports, preventing the solder balls from being stuck and moving inflexibly. The relationship between the inclination direction of the slope 242 and the rotation direction of the turntable 21 is: the turntable 21 rotates from the feeding port corresponding to the lower end of the slope to the feeding port corresponding to the higher end of the slope, that is, the solder balls preferentially roll into the feeding ports from the lower end of the slope, so that the solder balls can enter the previous feeding hole in most cases, and the feeding port at the higher end of the slope is in a standby state under normal conditions. Only when the feeding of the previous feeding hole fails, the feeding port at the higher end of the slope feeds the feeding hole again to reduce the probability of feeding failure.

[0041] like Figure 2 As shown, a feeding channel 251 connected to the discharge hole 221 and inclined downward is provided in the feeding tube 25. The bottom of the feeding tube 25 extends into the welding head 11 of the laser welder. After the solder ball 30 enters the welding head through the feeding channel 251, the high-power laser instantly melts the solder ball 30 and sprays the solder ball onto the surface of the workpiece.

[0042] The working process of this embodiment is as follows: a number of solder balls 30 are placed in the storage barrel, and the solder balls are automatically arranged in a row in the flat feeding barrel 24, the indexing drive device of the turntable 21 is started, and the turntable 21 is rotated so that the first two feeding holes are aligned with the two feeding ports 241, and the solder balls automatically fall into the two feeding holes, and then the turntable 21 rotates one more beat, the second feeding hole is aligned with the feeding port at the high end on the right, and the third feeding hole is aligned with the feeding port at the low end on the left, and the solder balls are fed into the third feeding hole from the feeding port at the low end of the slope, and this is repeated. When the feeding hole 211 carrying the solder balls moves to the top of the discharge hole 221 on the chassis, the solder balls 30 automatically fall into the discharge hole 221, and then are fed into the laser welding head through the feeding channel 251, and the solder balls are repeatedly transported to the laser welding head.

[0043] Example 2

[0044] like Figure 5 and Figure 6 As shown, the difference between this embodiment and embodiment 1 is that the structure of the slope component in the feeding barrel is different. In this embodiment, a material shifting block 244 horizontally supported by a rotating shaft 243 is installed at the bottom of the feeding barrel, wherein the slope is located at the top of the material shifting block 244, and the slope is an arched slope with two ends respectively bent toward two feeding ports, and the material shifting block 244 can be slightly shaken in the feeding barrel 24, that is, when feeding, the movement of the solder ball at the bottom of the feeding barrel 24 destroys the balance of the pressure distribution of the solder ball on the material shifting block, causing the material shifting block 244 to shake slightly, thereby in turn shifting the solder ball to roll, so as to further improve the feeding efficiency of the solder ball.

[0045] Example 3

[0046] like Figures 5 to 9 As shown, the difference between this embodiment and embodiment 2 is that the material-pickup block 244 is shaken by the matching structure of the sector gear 26 and the rack 27. Specifically, a plurality of racks 27 are installed on the turntable 21, and the end of the rotating shaft of the material-pickup block 244 extends out of the feeding barrel 24 and is keyed to the sector gear 26, and the sector gear 26 is meshed with the rack 27. The rack 27 can drive the sector gear 26 to rotate, thereby driving the material-pickup block 244 to shake. The material-pickup block 244 can be controlled to shake slightly at a smaller angle by reasonably configuring the parameters such as the number of teeth, tooth spacing, and module of the sector gear, so that the solder ball can roll. The bottom of the material-pickup block 244 is an arch with both ends rising, and the bottom of the material-pickup block 244 is suspended, thereby providing sufficient space for the shaking of the material-pickup block. The bottom of the feeding barrel 24 is formed with limit blocks 245 at both ends of the material shifting block 244. A movable gap 246 is left between one side wall of the limit block 245 and the material shifting block 244 for the material shifting block to swing. The other side wall of the limit block 245 is the hole wall of the feeding port 241.

[0047] like Figure 4 As shown, the longitudinal sections of the rack 27 and the sector gear 26 are both arc-shaped, so that the meshing between the two does not interfere with the rotation of the turntable. The plurality of racks 27 are evenly distributed on the same circumference with the same center as the turntable 21. Figure 7 As shown, a counterweight 28 is installed on the sector gear 26, and the counterweight 28 is located on the side of the sector gear 26 away from the direction of the rack. When the working rack rotates over the storage barrel, the sector gear 26 automatically reverses and resets under the action of the counterweight 28, thereby resetting the material shifting block 244 and preparing to start the next feeding action.

[0048] The working process of this device is:

[0049] Put a number of solder balls 30 into the storage barrel, and the solder balls are automatically arranged in a row in the flat feeding barrel 24. Start the indexing drive device of the turntable 21, rotate the turntable 21, align the first two feeding holes with the two feeding ports 241, and the solder balls automatically fall into the two feeding holes; during the rotation of the turntable, the rack 27 is meshed with the fan gear 26, driving the material shifting block 244 to shake slightly and shift the solder balls in the feeding barrel 24, so that the two solder balls roll smoothly into the two feeding ports 241 respectively, avoiding feeding failure. After the material shifting action is completed, the material shifting block 244 automatically resets under the action of the counterweight block 28. Then the turntable 21 rotates one more beat, the second feeding hole is aligned with the feeding port on the right, and the third feeding hole is aligned with the feeding port on the left. The solder balls are fed from the feeding port on the left into the third feeding hole, and this is repeated. When the feeding hole carrying the solder balls moves to above the discharge hole 221 on the bottom plate 22 , the solder balls automatically fall into the discharge hole 221 and are then fed into the laser welding head through the feeding channel 251 , thereby repeatedly feeding the solder balls to the laser welding head.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A non-contact laser welding device, characterized in that: Includes a laser welder and a solder ball feeding mechanism; The solder ball feeding mechanism is located at the side of the welding head of the laser welder, and the solder ball feeding mechanism includes a turntable, a bottom plate, a storage cylinder and a feeding pipe; The chassis is fixedly installed and supports the turntable, the turntable is driven by the indexing device to rotate intermittently, a plurality of feed holes are distributed on the turntable along a circle co-centered with the turntable, and a discharge hole adapted to the feed hole is provided on the chassis, and the feed holes on the turntable can be rotated to the top of the discharge hole in turn to feed the solder balls into the discharge hole one by one; The material storage barrel is fixedly installed and located above the turntable. The material storage barrel includes a funnel-shaped feeding barrel and a flat feeding barrel connected in sequence from top to bottom. The feeding barrel covers two feeding holes along its flat direction. Two feeding ports are respectively provided at the two ends of the bottom of the feeding barrel along its flat direction. The spacing between the two feeding ports is equal to the spacing between two adjacent feeding holes. The bottom of the feeding barrel is also provided with a slope for auxiliary feeding, and the two ends of the slope extend toward the direction of the two feeding ports respectively. The feed pipe is installed at the bottom of the chassis. A feed channel connected to the discharge hole and inclined downward is provided in the feed pipe. The bottom of the feed pipe extends into the welding head of the laser welder.

2. The non-contact laser welding device according to claim 1, characterized in that: The slope surface is integrally formed with the feeding barrel, and the high and low ends of the slope surface extend to the edges of the two feeding ports respectively.

3. The non-contact laser welding device according to claim 2, characterized in that: The relationship between the inclination direction of the slope and the direction of the turntable is that the turntable rotates from the feeding port corresponding to the lower end of the slope to the feeding port corresponding to the higher end of the slope.

4. The non-contact laser welding device according to claim 1, characterized in that: A material shifting block horizontally supported by a rotating shaft is installed at the bottom of the feeding barrel, and the material shifting block can swing in the feeding barrel; the top of the material shifting block is provided with the slope surface, and the slope surface is an arch with both ends bent toward the two feeding ports respectively.

5. The non-contact laser welding device according to claim 4, characterized in that: A plurality of racks are installed at intervals on the turntable, the end of the rotating shaft of the material shifting block extends out of the feeding barrel and is keyed to a sector gear, the sector gear is meshed with the rack, and when the turntable rotates, the rack can drive the sector gear to rotate.

6. The non-contact laser welding device according to claim 5, characterized in that: The longitudinal sections of the rack and the sector gear are both arc-shaped, and a plurality of the racks are evenly distributed on the same circumference that is co-centered with the turntable.

7. The non-contact laser welding device according to claim 6, characterized in that: A counterweight is installed on the sector gear, and the counterweight is located on a side of the sector gear away from the rack.

8. The non-contact laser welding device according to claim 4, characterized in that: The bottom of the feeding cylinder is formed with limiting blocks at both ends of the material shifting block, and a movable gap for the material shifting block to swing is reserved between one side wall of the limiting block and the material shifting block, and the other side wall of the limiting block is the hole wall of the feeding port.

9. The non-contact laser welding device according to claim 4, characterized in that: The bottom of the material shifting block is in an arch shape with two ends rising upward, and the bottom of the material shifting block is suspended in the air.

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