Device and method for efficiently welding large-size capacitor on printed circuit board

Abstract

The invention discloses a device and method for efficiently welding large-size capacitors on a printed circuit board, and relates to the technical field of welding two large-size capacitors on the printed circuit board. Two positioning and welding assemblies for positioning and welding the large-size capacitors are arranged on the left end face of a vertical plate; the workbench is also provided with a positioning and pushing assembly which is used for positioning the printed circuit board and pushing the printed circuit board towards the direction of the large-size capacitor. The positioning and pushing assembly comprises a base fixedly arranged on the workbench and a pushing air cylinder fixedly arranged on the left end face of the base, a piston rod of the pushing air cylinder rightwards penetrates through the base, a back plate is fixedly arranged at the extending end of the piston rod, a longitudinally-arranged supporting strip is fixedly arranged at the bottom of the back plate, and a clamping groove is formed in the top surface of the supporting strip in the length direction of the supporting strip. The method has the beneficial effects that the welding efficiency of the printed circuit board and the two large-size capacitors is shortened, and the welding efficiency of the printed circuit board and the two large-size capacitors is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of soldering two large-sized capacitors on a printed circuit board, in particular to a device and method for efficiently soldering large-sized capacitors on a printed circuit board. Background Art

[0002] The structure of a printed circuit board 1 produced in a certain workshop is as Figures 1 - 2 shown. Two solder pads 2 are formed on the printed circuit board 1. Both of the two solder pads 2 are circular in shape, and both of the two solder pads 2 are metal copper plating layers. Technologically, it is required to solder a large-sized capacitor as Figures 3 - 4 shown on each of the two solder pads 2 of the printed circuit board 1. The large-sized capacitor includes a capacitor body 3 in a rectangular shape, and an L-shaped lead 4 is connected to the end face of the capacitor body 3. The height of the capacitor body 3 is 7 - 8 cm. The printed circuit board 1 soldered with two large-sized capacitors is mainly supplied to customers, and the customers then form a circuit layer on the printed circuit board 1 to make the circuit layer conduct with the two large-sized capacitors.

[0003] In the workshop, the method for workers to solder two large-sized capacitors on the printed circuit board 1 is as follows: S1. The worker takes out a printed circuit board 1 as Figures 1 - 2 shown, places it flat on the tabletop of the machine, and ensures that the two solder pads 2 on the printed circuit board 1 face upward; S2. The worker takes out a large-sized capacitor as Figures 3 - 4 shown, supports the horizontal parts of the two L-shaped leads 4 of the large-sized capacitor on the top surface of one solder pad 2, and then the worker adjusts the position of the large-sized capacitor so that the capacitor body 3 of the large-sized capacitor is aligned with the solder pad 2 to complete the positioning of the large-sized capacitor and the solder pad 2, as Figure 5 shown; Then the worker operates the spot welder, and makes the spot welding head 5 of the spot welder touch the horizontal part of the left L-shaped lead 4 of the large-sized capacitor, as Figure 6 shown, so as to solder the left L-shaped lead 4 on the solder pad 2; The worker continues to operate the spot welder, and makes the spot welding head 5 of the spot welder touch the horizontal part of the right L-shaped lead 4 of the large-sized capacitor, as Figure 7 shown, so as to solder the right L-shaped lead 4 on the solder pad 2, and thus finally the first large-sized capacitor is soldered on one solder pad 2; S3. The worker repeats the operation of step S2 once in this way, so as to solder the second large-sized capacitor on the other solder pad 2, as Figure 8 shown, and thus finally two large-sized capacitors are soldered on one printed circuit board 1; S4. Workers repeat the operations of steps S1 - S3 multiple times, then two large - size capacitors can be continuously welded on multiple printed circuit boards 1. After welding, the circuit board manufacturer supplies the welded printed circuit boards 1 to customers for use.

[0004] However, although the method used in the workshop can weld two large - size capacitors on multiple printed circuit boards 1, in actual operation, the following technical defects are still reflected: I. In step S2, after the worker supports the two L - shaped pins 4 of the large - size capacitor on the top surface of the pad 2, the worker needs to frequently adjust the position of the large - size capacitor to complete the positioning of the large - size capacitor and the pad 2. This undoubtedly prolongs the welding time between the large - size capacitor and the pad 2, thus reducing the welding efficiency of the printed circuit board 1 and the large - size capacitor.

[0005] II. In steps S2 - S3, the worker needs to operate the spot welder four times in total to successively weld two large - size capacitors on the two pads 2 of the printed circuit board 1 respectively. It takes a long time to weld both large - size capacitors on the printed circuit board 1, which further prolongs the time for welding large - size capacitors on the subsequent printed circuit boards 1. As a result, the production workshop cannot supply goods to customers within the specified time, further reducing the welding efficiency of the printed circuit board 1 and the large - size capacitor.

[0006] Therefore, there is an urgent need for a device and method that can shorten the welding time between the printed circuit board and two large - size capacitors and greatly improve the welding efficiency between the printed circuit board and two large - size capacitors. Summary of the Invention

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a device and method for efficiently welding large - size capacitors on a printed circuit board, which can shorten the welding time between the printed circuit board and two large - size capacitors and greatly improve the welding efficiency between the printed circuit board and two large - size capacitors.

[0008] The purpose of the present invention is achieved by the following technical solutions: A device for efficiently welding large - size capacitors on a printed circuit board, which includes a vertical plate fixed on the workbench. On the left end face of the vertical plate, there are two positioning and welding components for positioning and welding large - size capacitors. On the workbench, there is also a positioning and pushing component for positioning the printed circuit board and pushing the printed circuit board towards the direction of the large - size capacitor; The positioning and pushing component includes a base fixed on the workbench, a pushing cylinder fixed on the left end face of the base. The piston rod of the pushing cylinder penetrates the base to the right, and a back plate is fixed on the extending end. A longitudinally arranged support bar is fixed at the bottom of the back plate, and a card slot is opened on the top surface of the support bar along its length direction; The positioning and welding assembly located on the upper side of the vertical plate includes a connecting rod fixed on the vertical plate, a frame fixed on the left end of the connecting rod, and a hollow positioning cylinder fixed on the left end face of the frame. A sliding plate matching with its inner cavity is slidably installed in the hollow positioning cylinder. A spring is fixed between the right end face of the sliding plate and the bottom wall of the hollow positioning cylinder. The inner cavity of the hollow positioning cylinder matches with the outer contour of the capacitor body of the large-size capacitor. A double-acting cylinder vertically arranged is also fixed in the frame. Brackets are fixed on the acting ends of the two piston rods of the double-acting cylinder. Both brackets extend leftward, and horizontal spot welding heads are fixed in the extending ends. The right end of the spot welding head is connected to a spot welder through a power cord.

[0009] The left end face of the card slot is flush with the right end face of the back plate. The horizontal width of the card slot is equal to the width of the printed circuit board, and the longitudinal width of the card slot is equal to the longitudinal width of the printed circuit board.

[0010] A rotary cylinder is fixed on the left end face of the upper end of the back plate. The rotary shaft of the rotary cylinder penetrates the back plate to the right, and a rotary plate is fixed on the extending end.

[0011] The two brackets are symmetrically arranged up and down with respect to the hollow positioning cylinder, and the two spot welding heads are symmetrically arranged up and down with respect to the hollow positioning cylinder.

[0012] The structure of the positioning and welding assembly located on the lower side of the vertical plate is the same as that of the positioning and welding assembly located on the upper side of the vertical plate.

[0013] The connecting rod and the hollow positioning cylinder are on the same straight line.

[0014] The device further includes a controller, and the controller is electrically connected to the pushing cylinder, the rotary cylinder, and the double-acting cylinder through signal lines.

[0015] A method for efficiently welding large-size capacitors on a printed circuit board includes the following steps: S1. Position the printed circuit board. The specific operation steps are as follows: S11. The worker takes out a printed circuit board, leans the printed circuit board against the right end face of the back plate of the positioning and pushing assembly, and then the worker inserts the lower end of the printed circuit board into the card slot of the support bar of the positioning and pushing assembly from top to bottom. S12. Control the rotary cylinder of the positioning and pushing assembly to start. The rotary cylinder drives the rotary plate to rotate. When the rotary plate rotates 180°, the controller controls the rotary cylinder to close. At this time, the rotary plate just blocks the right side of the upper end of the printed circuit board and contacts the right end face of the printed circuit board. S2. Position the two large-size capacitors. The specific operation steps are as follows: S21. The worker inserts the capacitor body of a large-sized capacitor from left to right into the hollow positioning cylinder of the upper positioning and welding assembly, ensuring that the right end face of the capacitor body contacts the left end face of the slide plate. Since the inner cavity of the hollow positioning cylinder matches the outer contour of the capacitor body of the large-sized capacitor, the first large-sized capacitor is positioned in the hollow positioning cylinder of the upper positioning and welding assembly. At this time, the vertical portions of the two L-shaped leads of the large-sized capacitor are respectively opposite to the upper pads of the printed circuit board left and right; S22. Repeat the operation in step S21 once to position the second large-sized capacitor in the hollow positioning cylinder of the lower positioning and welding assembly. At this time, the vertical portions of the two L-shaped leads of the large-sized capacitor are respectively opposite to the lower pads of the printed circuit board left and right; S3. Control the two piston rods of the double-acting cylinder of the upper positioning and welding assembly to retract. The two piston rods drive the brackets connected to them to move in opposite directions, and the two brackets drive the spot welding heads connected to them to move in opposite directions. When the two piston rods of the double-acting cylinder are fully retracted, the two spot welding heads are respectively on the right sides of the vertical portions of the two L-shaped leads of the upper large-sized capacitor; Control the two piston rods of the double-acting cylinder of the lower positioning and welding assembly to retract. When the two piston rods of the double-acting cylinder are fully retracted, the two spot welding heads are respectively on the right sides of the vertical portions of the two L-shaped leads of the lower large-sized capacitor; S4. Control the piston rod of the push cylinder of the positioning and pushing assembly to extend to the right. The piston rod drives the back plate to move to the right, and the back plate drives the support bar, the rotary cylinder, and the printed circuit board to move to the right synchronously. The upper pads of the printed circuit board move towards the vertical portions of the two L-shaped leads of the upper large-sized capacitor. At the same time, the lower pads of the printed circuit board move towards the vertical portions of the two L-shaped leads of the lower large-sized capacitor; When the printed circuit board continues to move a certain distance to the right, the upper pads contact the vertical portions of the two L-shaped leads of the upper large-sized capacitor. At the same time, the lower pads contact the vertical portions of the two L-shaped leads of the lower large-sized capacitor; As the printed circuit board continues to move to the right, the printed circuit board pushes the L-shaped leads of the two large-sized capacitors to move to the right. The L-shaped leads then push the capacitor body of the large-sized capacitor to move to the right. The capacitor body then pushes the slide plate to move to the right, and the slide plate compresses the spring to the right; As the printed circuit board continues to move to the right, when the vertical parts of the two L-shaped pins of the large-sized capacitor on the upper side respectively touch the two spot welding heads, the vertical parts of the two L-shaped pins are both spot welded to the upper side pads, thus realizing the welding of the large-sized capacitor on the upper side to the upper side pads. At the same time, when the vertical parts of the two L-shaped pins of the large-sized capacitor on the lower side respectively touch the two spot welding heads, the vertical parts of the two L-shaped pins are both spot welded to the lower side pads, thus realizing the welding of the large-sized capacitor on the lower side to the lower side pads, and finally realizing the welding of two large-sized capacitors on the printed circuit board; S5. Removing the printed circuit board with two large-sized capacitors welded thereon, and the specific operation steps are as follows: S51. Control the piston rod of the pushing cylinder of the positioning and pushing assembly to retract to the left. The piston rod drives the back plate to move to the left. The back plate drives the support bar, the printed circuit board, and the rotating cylinder to move to the left synchronously. The printed circuit board drives the two large-sized capacitors to move to the left synchronously. When the piston rod of the pushing cylinder is fully retracted, the worker controls the rotating cylinder to start. The rotating cylinder drives the rotating plate to rotate, and the rotating plate is separated from the printed circuit board. When the rotating plate rotates 180°, the controller controls the rotating cylinder to close; S52. The worker lifts the printed circuit board upward to make it away from the support bar, and then the worker removes the printed circuit board with two large-sized capacitors welded thereon; S6. The worker repeats the operations of steps S1 to S5 multiple times, and then two large-sized capacitors can be continuously welded on multiple printed circuit boards. After welding, the circuit board manufacturer supplies the welded printed circuit boards to customers for use.

[0016] The present invention has the following advantages: shortening the welding efficiency between the printed circuit board 1 and the two large-sized capacitors, and greatly improving the welding efficiency between the printed circuit board and the two large-sized capacitors. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of a printed circuit board produced by a certain workshop; Figure 2 It is Figure 1 the top view of Figure 3 It is a schematic structural diagram of a large-sized capacitor; Figure 4 It is Figure 3 the front view of Figure 5 It is a schematic diagram of completing the positioning between the large-sized capacitor and the pad; Figure 6 It is a schematic diagram of making the spot welding head of the spot welder touch the horizontal part of the left L-shaped pin of the large-sized capacitor; Figure 7Schematic diagram of the spot welding head of the spot welder touching the horizontal part of the right L-shaped pin of the large-sized capacitor; Figure 8 Schematic diagram for welding the second large-sized capacitor onto another pad; Figure 9 Schematic structural diagram of the present invention; Figure 10 For Figure 9 Main sectional view; Figure 11 Axonometric view of the positioning and pushing component; Figure 12 For Figure 10 Main sectional view; Figure 13 Axonometric view of the vertical plate connected to the two positioning and welding components; Figure 14 For Figure 13 View in the direction A of Figure 15 For Figure 13 Main sectional view; Figure 16 Schematic diagram for embedding the lower end of the printed circuit board into the card slot of the support bar from top to bottom; Figure 17 Schematic diagram of the rotating plate in contact with the right end face of the printed circuit board; Figure 18 Schematic diagram for positioning the large-sized capacitor in the hollow positioning cylinder of the positioning and welding component; Figure 19 Schematic diagram of the two spot welding heads respectively on the right side of the vertical parts of the two L-shaped pins of the large-sized capacitor; Figure 20 Schematic diagram of the pad in contact with the vertical parts of the two L-shaped pins of the large-sized capacitor; Figure 21 For Figure 20 Partial enlarged view of part B of Figure 22 Schematic diagram after the vertical parts of the two L-shaped pins of the large-sized capacitor respectively touch the two spot welding heads; Figure 23 For Figure 22 Partial enlarged view of part C of Figure 24 Schematic diagram of the printed circuit board driving the two large-sized capacitors to move synchronously to the left; Figure 25 Schematic diagram of the rotating plate separating from the printed circuit board; In the figure: 1 - Printed circuit board, 2 - Pad, 3 - Capacitor body, 4 - L-shaped pin, 5 - Spot welding head; 6 - Workbench, 7 - Vertical plate, 8 - Positioning and welding assembly, 9 - Positioning and pushing assembly, 10 - Base, 11 - Pushing cylinder, 12 - Back plate, 13 - Support bar, 14 - Card slot; 15 - Connecting rod, 16 - Frame, 17 - Hollow positioning cylinder, 18 - Slide plate, 19 - Spring, 20 - Double - acting cylinder, 21 - Bracket, 22 - Rotary cylinder, 23 - Rotary plate. Detailed implementation manner

[0018] The following further describes the present invention in conjunction with the attached drawings. The protection scope of the present invention is not limited to the following: As Figures 9 - 15 shown, a device for efficiently welding large - size capacitors on a printed circuit board includes a vertical plate 7 fixedly arranged on a workbench 6. On the left end face of the vertical plate 7, there are two positioning and welding assemblies 8 for positioning and welding large - size capacitors. On the workbench 6, there is also a positioning and pushing assembly 9 for positioning a printed circuit board 1 and pushing the printed circuit board 1 towards the direction of the large - size capacitor; The positioning and pushing assembly 9 includes a base 10 fixedly arranged on the workbench 6, and a pushing cylinder 11 fixedly arranged on the left end face of the base 10. The piston rod of the pushing cylinder 11 penetrates the base 10 to the right, and a back plate 12 is fixedly arranged on the extending end. A longitudinally arranged support bar 13 is fixedly arranged at the bottom of the back plate 12. A card slot 14 is opened on the top surface of the support bar 13 along its length direction. The left end face of the card slot 14 is flush with the right end face of the back plate 12. The horizontal width of the card slot 14 is equal to the width of the printed circuit board 1, and the longitudinal width of the card slot 14 is equal to the longitudinal width of the printed circuit board 1. A rotary cylinder 22 is fixedly arranged on the left end face of the upper end of the back plate 12. The rotary shaft of the rotary cylinder 22 penetrates the back plate 12 to the right, and a rotary plate 23 is fixedly arranged on the extending end.

[0019] The structure of the positioning and welding assembly 8 located on the lower side of the vertical plate 7 is the same as that of the positioning and welding assembly 8 located on the upper side of the vertical plate 7. The positioning and welding assembly 8 located on the upper side of the vertical plate 7 includes a connecting rod 15 fixed on the vertical plate 7, a frame 16 fixed on the left end of the connecting rod 15, and a hollow positioning cylinder 17 fixed on the left end face of the frame 16. The connecting rod 15 and the hollow positioning cylinder 17 are on the same straight line. A slide plate 18 that matches the inner cavity thereof is slidably installed in the hollow positioning cylinder 17. A spring 19 is fixedly arranged between the right end face of the slide plate 18 and the bottom wall of the hollow positioning cylinder 17. The inner cavity of the hollow positioning cylinder 17 matches the outer contour of the capacitor body 3 of the large-size capacitor. A vertically arranged double-acting cylinder 20 is also fixedly installed in the frame 16. Bracket 21 are fixedly arranged on the acting ends of the two piston rods of the double-acting cylinder 20. The two brackets 21 are symmetrically arranged up and down with respect to the hollow positioning cylinder 17. The two brackets 21 both extend leftward, and horizontally arranged spot welding heads 5 are fixedly installed in the extending ends. The two spot welding heads 5 are symmetrically arranged up and down with respect to the hollow positioning cylinder 17. The right end of the spot welding head 5 is connected to a spot welder via a power cord.

[0020] The device further includes a controller, which is electrically connected to the pushing cylinder 11, the rotating cylinder 22, and the double-acting cylinder 20 via signal lines. Workers can control the piston rods of the pushing cylinder 11 and the double-acting cylinder 20 to extend or retract through the controller. At the same time, they can also control the rotating shaft of the rotating cylinder 22 to perform a rotating motion, thus facilitating the operation of the workers.

[0021] A method for efficiently welding large-size capacitors on a printed circuit board includes the following steps: S1. Position the printed circuit board 1. The specific operation steps are as follows: S11. Workers take out a printed circuit board 1 as shown in Figures 1 - 2 and lean the printed circuit board 1 against the right end face of the back plate 12 of the positioning and pushing assembly 9. Then, the workers embed the lower end of the printed circuit board 1 into the card slot 14 of the support bar 13 of the positioning and pushing assembly 9 from top to bottom, as shown in Figure 16 . S12. Control the rotating cylinder 22 of the positioning and pushing assembly 9 to start. The rotating cylinder 22 drives the rotating plate 23 to rotate. When the rotating plate 23 rotates 180°, the controller controls the rotating cylinder 22 to close. At this time, the rotating plate 23 just blocks the right side of the upper end of the printed circuit board 1 and contacts the right end face of the printed circuit board 1, as shown in Figure 17 . S2. Position the two large-size capacitors. The specific operation steps are as follows: S21. Workers place a capacitor as shown in Figures 3 - 4The capacitor body 3 of the large-sized capacitor shown is inserted into the hollow positioning cylinder 17 of the upper positioning and welding assembly 8 from left to right, ensuring that the right end face of the capacitor body 3 is in contact with the left end face of the slide plate 18. Since the inner cavity of the hollow positioning cylinder 17 matches the outer contour of the capacitor body 3 of the large-sized capacitor, the first large-sized capacitor is positioned within the hollow positioning cylinder 17 of the upper positioning and welding assembly 8, as Figure 18 shown. At this time, the vertical portions of the two L-shaped pins 4 of the large-sized capacitor are respectively opposite to the upper pads 2 of the printed circuit board 1 left and right; S22. Repeat the operation in step S21 once to position the second large-sized capacitor within the hollow positioning cylinder 17 of the lower positioning and welding assembly 8. At this time, the vertical portions of the two L-shaped pins 4 of the large-sized capacitor are respectively opposite to the lower pads 2 of the printed circuit board 1 left and right; S3. Control the two piston rods of the double-acting cylinder 20 of the upper positioning and welding assembly 8 to retract. The two piston rods drive the brackets 21 connected to them to move in opposite directions. The two brackets 21 drive the spot welding heads 5 connected to them to move in opposite directions. When the two piston rods of the double-acting cylinder 20 are fully retracted, the two spot welding heads 5 are respectively on the right sides of the vertical portions of the two L-shaped pins 4 of the upper large-sized capacitor, as Figure 19 shown; Control the two piston rods of the double-acting cylinder 20 of the lower positioning and welding assembly 8 to retract. When the two piston rods of the double-acting cylinder 20 are fully retracted, the two spot welding heads 5 are respectively on the right sides of the vertical portions of the two L-shaped pins 4 of the lower large-sized capacitor; S4. Control the piston rod of the push cylinder 11 of the positioning and pushing assembly 9 to extend to the right. The piston rod drives the back plate 12 to move to the right. The back plate 12 drives the support bar 13, the rotary cylinder 22, and the printed circuit board 1 to move to the right synchronously. The upper pads 2 of the printed circuit board 1 move towards the vertical portions of the two L-shaped pins 4 of the upper large-sized capacitor. At the same time, the lower pads 2 of the printed circuit board 1 move towards the vertical portions of the two L-shaped pins 4 of the lower large-sized capacitor; When the printed circuit board 1 continues to move a certain distance to the right, the upper pads 2 come into contact with the vertical portions of the two L-shaped pins 4 of the upper large-sized capacitor, as Figures 20 - 21 shown. At the same time, the lower pads 2 come into contact with the vertical portions of the two L-shaped pins 4 of the lower large-sized capacitor; As the printed circuit board 1 continues to move to the right, the printed circuit board 1 pushes the L-shaped pins 4 of the two large-sized capacitors to move to the right. The L-shaped pins 4 then push the capacitor body 3 of the large-sized capacitor to move to the right. The capacitor body 3 then pushes the slide plate 18 to move to the right. The slide plate 18 compresses the spring 19 to the right; As the printed circuit board 1 continues to move to the right, when the vertical parts of the two L-shaped pins 4 of the large-size capacitor on the upper side respectively touch the two spot welding heads 5, as Figures 22 - 23 shown, the vertical parts of the two L-shaped pins 4 are both spot-welded to the upper-side pads 2, thereby realizing the welding of the large-size capacitor on the upper side to the upper-side pads 2. At the same time, when the vertical parts of the two L-shaped pins 4 of the large-size capacitor on the lower side respectively touch the two spot welding heads 5, the vertical parts of the two L-shaped pins 4 are both spot-welded to the lower-side pads 2, thereby realizing the welding of the large-size capacitor on the lower side to the lower-side pads 2. Furthermore, finally, two large-size capacitors are welded on the printed circuit board 1, and the welded structure is as Figure 8 shown; Among them, in step S1, after the lower end of the printed circuit board 1 is embedded in the card slot 14 of the positioning and pushing component 9, the positioning of the printed circuit board 1 is completed; in step S2, after the capacitor body 3 of the large-size capacitor is embedded in the hollow positioning cylinder 17 of the positioning and welding component 8, the positioning of the large-size capacitor is completed, so that the capacitor body 3 of the large-size capacitor and the pads 2 on the printed circuit board 1 are opposite to each other left and right; in step S4, the piston rod of the pushing cylinder 11 of the positioning and pushing component 9 is controlled to extend to the right, so that finally the large-size capacitor is positioned on the pads 2. At this time, the capacitor body 3 of the large-size capacitor is facing the pads 2.

[0022] It can be seen from this that compared with the welding method as Figures 5 - 7 shown, this device requires workers to frequently adjust the position of the large-size capacitor to complete the positioning of the large-size capacitor and the pads 2. Instead, only by sequentially completing the processes of positioning the printed circuit board 1, positioning the large-size capacitor, and controlling the piston rod of the pushing cylinder 11 to extend to the right, the large-size capacitor can be quickly positioned on the pads 2, thereby greatly shortening the positioning time of the large-size capacitor and the pads 2, and further shortening the welding time of the large-size capacitor and the pads 2, thus greatly improving the welding efficiency of the printed circuit board 1 and the large-size capacitor.

[0023] S5. Taking away the printed circuit board 1 with two large-size capacitors welded thereon, the specific operation steps are as follows: S51. Control the piston rod of the pushing cylinder 11 of the positioning and pushing component 9 to retract to the left. The piston rod drives the back plate 12 to move to the left. The back plate 12 drives the support bar 13, the printed circuit board 1, and the rotary cylinder 22 to move to the left synchronously. The printed circuit board 1 drives the two large-size capacitors to move to the left synchronously, as Figure 24 shown. When the piston rod of the pushing cylinder 11 is completely retracted, the worker controls the rotary cylinder 22 to start. The rotary cylinder 22 drives the rotary plate 23 to rotate, and the rotary plate 23 is separated from the printed circuit board 1, as Figure 25 shown. When the rotary plate 23 rotates 180°, the controller controls the rotary cylinder 22 to turn off; S52. The worker lifts the printed circuit board 1 upward to move it away from the support bar 13, and then the worker removes the printed circuit board 1 with two large-sized capacitors soldered thereon. The removal direction is as Figure 25 shown by the arrow in the figure; S6. The worker repeats the operations of steps S1 - S5 multiple times, and thus two large-sized capacitors can be continuously soldered on multiple printed circuit boards 1. After soldering, the circuit board manufacturer supplies the soldered printed circuit boards 1 to the customers for use.

[0024] Among them, as can be seen from step S4, it is only necessary to control the extension action of the piston rod of the pushing cylinder 11 to move the printed circuit board 1 to the right. The pads 2 of the printed circuit board 1 first come into contact with the vertical parts of the two L-shaped pins 4 of the large-sized capacitor, and then push the two L-shaped pins 4 of the large-sized capacitor to the right. When the vertical parts of the two L-shaped pins 4 of the large-sized capacitor respectively touch the two spot welding heads 5, the vertical parts of the two L-shaped pins 4 can be spot welded to the pads 2, thereby realizing the soldering of the two large-sized capacitors to the two pads 2 of the printed circuit board 1 respectively.

[0025] It can be seen from this that this device only needs to control the extension action of the piston rod of the pushing cylinder 11 to solder the two large-sized capacitors to the two pads 2 of the printed circuit board 1 respectively within the same time period. Compared with the Figures 5 - 7 soldering method shown in the figure, it is not necessary for the worker to operate the spot welder four times to successively solder the two large-sized capacitors to the two pads 2 of the printed circuit board 1 respectively, thus realizing the soldering of the two large-sized capacitors on the printed circuit board 1 in a short time, and further improving the soldering efficiency of the printed circuit board 1 and the large-sized capacitors, ensuring that the production workshop can supply goods to the customers within the specified time.

Claims

1. An apparatus for efficiently soldering large-sized capacitors onto a printed circuit board, characterized in that: It includes a vertical plate (7) fixedly arranged on a workbench (6). On the left end face of the vertical plate (7), there are two positioning and welding assemblies (8) for positioning and welding large-sized capacitors. On the workbench (6), there is also a positioning and pushing assembly (9) for positioning a printed circuit board (1) and pushing the printed circuit board (1) towards the direction of the large-sized capacitor. The positioning and pushing assembly (9) includes a base (10) fixedly arranged on the workbench (6), and a pushing cylinder (11) fixedly arranged on the left end face of the base (10). The piston rod of the pushing cylinder (11) penetrates through the base (10) to the right, and a back plate (12) is fixedly arranged on the extending end. At the bottom of the back plate (12), there is a longitudinally arranged support bar (13). On the top surface of the support bar (13), a card slot (14) is opened along its length direction. The positioning and welding assembly (8) located above the vertical plate (7) includes a connecting rod (15) fixedly arranged on the vertical plate (7), a frame (16) fixedly arranged at the left end of the connecting rod (15), and a hollow positioning cylinder (17) fixedly arranged on the left end face of the frame (16). A slide plate (18) that matches its inner cavity is slidably installed in the hollow positioning cylinder (17). A spring (19) is fixedly arranged between the right end face of the slide plate (18) and the bottom wall of the hollow positioning cylinder (17). The inner cavity of the hollow positioning cylinder (17) matches the outer contour of the capacitor body (3) of the large-sized capacitor. Inside the frame (16), there is also a vertically arranged double-acting cylinder (20). On the acting ends of the two piston rods of the double-acting cylinder (20), there are brackets (21) fixedly arranged. Both brackets (21) extend to the left, and horizontally arranged spot welding heads (5) are fixedly arranged inside the extending ends. The right end of the spot welding head (5) is connected to a spot welder through a power cord.

2. The device for efficiently soldering large-sized capacitors on a printed circuit board according to claim 1, characterized in that: The left end face of the card slot (14) is flush with the right end face of the back plate (12). The horizontal width of the card slot (14) is equal to the width of the printed circuit board (1), and the longitudinal width of the card slot (14) is equal to the longitudinal width of the printed circuit board (1).

3. An apparatus for efficiently soldering a large-sized capacitor onto a printed circuit board according to claim 2, characterized in that: On the left end face of the upper end of the back plate (12), a rotary cylinder (22) is fixedly arranged. The rotary shaft of the rotary cylinder (22) penetrates through the back plate (12) to the right, and a rotary plate (23) is fixedly arranged on the extending end.

4. An apparatus for efficiently soldering large-sized capacitors on a printed circuit board according to claim 3, characterized in that: The two brackets (21) are symmetrically arranged up and down with respect to the hollow positioning cylinder (17), and the two spot welding heads (5) are symmetrically arranged up and down with respect to the hollow positioning cylinder (17).

5. The device for efficiently soldering large-sized capacitors on a printed circuit board according to claim 4, wherein: The structure of the positioning and welding assembly (8) located below the vertical plate (7) is the same as the structure of the positioning and welding assembly (8) located above the vertical plate (7).

6. The device for efficiently soldering large-sized capacitors on a printed circuit board according to claim 5, wherein: The connecting rod (15) and the hollow positioning cylinder (17) are on the same straight line.

7. An apparatus for efficiently soldering large-sized capacitors on a printed circuit board according to claim 6, characterized in that: This device also includes a controller, and the controller is electrically connected to the pushing cylinder (11), the rotary cylinder (22), and the double-acting cylinder (20) through signal lines.

8. A method for efficiently soldering large-sized capacitors on a printed circuit board, using the device for efficiently soldering large-sized capacitors on a printed circuit board as described in claim 7, characterized in that: It includes the following steps: S1. Position the printed circuit board (1), and the specific operation steps are as follows: S11. The worker takes out a printed circuit board (1), leans the printed circuit board (1) against the right end face of the back plate (12) of the positioning and pushing component (9), and then the worker inserts the lower end of the printed circuit board (1) into the card slot (14) of the support bar (13) of the positioning and pushing component (9) from top to bottom. S12. Control the rotation cylinder (22) of the positioning and pushing component (9) to start. The rotation cylinder (22) drives the rotation plate (23) to rotate. When the rotation plate (23) rotates 180°, the controller controls the rotation cylinder (22) to close. At this time, the rotation plate (23) just blocks the right side of the upper end of the printed circuit board (1) and contacts the right end face of the printed circuit board (1). S2. For the positioning of two large-sized capacitors, the specific operation steps are as follows: S21. The worker inserts the capacitor body (3) of a large-sized capacitor from left to right into the hollow positioning cylinder (17) of the upper positioning and welding component (8), ensuring that the right end face of the capacitor body (3) contacts the left end face of the slide plate (18). Since the inner cavity of the hollow positioning cylinder (17) matches the outer contour of the capacitor body (3) of the large-sized capacitor, the first large-sized capacitor is positioned in the hollow positioning cylinder (17) of the upper positioning and welding component (8). At this time, the vertical parts of the two L-shaped pins (4) of the large-sized capacitor are opposite to the upper side pads (2) of the printed circuit board (1) left and right. S22. Repeat the operation of step S21 once to position the second large-sized capacitor in the hollow positioning cylinder (17) of the lower positioning and welding component (8). At this time, the vertical parts of the two L-shaped pins (4) of the large-sized capacitor are opposite to the lower side pads (2) of the printed circuit board (1) left and right. S3. Control the two piston rods of the double-acting cylinder (20) of the upper positioning and welding component (8) to retract. The two piston rods drive the brackets (21) connected to them to move in opposite directions. The two brackets (21) drive the spot welding heads (5) connected to them to move in opposite directions. When the two piston rods of the double-acting cylinder (20) are fully retracted, the two spot welding heads (5) are respectively on the right side of the vertical parts of the two L-shaped pins (4) of the upper large-sized capacitor. Control the two piston rods of the double-acting cylinder (20) of the lower positioning and welding component (8) to retract. When the two piston rods of the double-acting cylinder (20) are fully retracted, the two spot welding heads (5) are respectively on the right side of the vertical parts of the two L-shaped pins (4) of the lower large-sized capacitor. S4. Control the piston rod of the push cylinder (11) of the positioning and pushing component (9) to extend to the right. The piston rod drives the back plate (12) to move to the right. The back plate (12) drives the support bar (13), the rotation cylinder (22) and the printed circuit board (1) to move to the right synchronously. The upper side pads (2) of the printed circuit board (1) move towards the vertical parts of the two L-shaped pins (4) of the upper large-sized capacitor. At the same time, the lower side pads (2) of the printed circuit board (1) move towards the vertical parts of the two L-shaped pins (4) of the lower large-sized capacitor. After the printed circuit board (1) continues to move a certain distance to the right, the upper solder pad (2) contacts the vertical parts of the two L-shaped pins (4) of the upper large-size capacitor. At the same time, the lower solder pad (2) contacts the vertical parts of the two L-shaped pins (4) of the lower large-size capacitor; As the printed circuit board (1) continues to move to the right, the printed circuit board (1) pushes the L-shaped pins (4) of the two large-size capacitors to move to the right. The L-shaped pins (4) then push the capacitor body (3) of the large-size capacitor to move to the right. The capacitor body (3) then pushes the slide plate (18) to move to the right, and the slide plate (18) compresses the spring (19) to the right; As the printed circuit board (1) continues to move to the right, when the vertical parts of the two L-shaped pins (4) of the upper large-size capacitor respectively touch the two spot welding heads (5), the vertical parts of the two L-shaped pins (4) are both spot welded to the upper solder pad (2), thus realizing the welding of the upper large-size capacitor to the upper solder pad (2). At the same time, when the vertical parts of the two L-shaped pins (4) of the lower large-size capacitor respectively touch the two spot welding heads (5), the vertical parts of the two L-shaped pins (4) are both spot welded to the lower solder pad (2), thus realizing the welding of the lower large-size capacitor to the lower solder pad (2), and finally realizing the welding of two large-size capacitors on the printed circuit board (1); S5. Taking away the printed circuit board (1) with two large-size capacitors welded thereon, the specific operation steps are as follows: S51. Control the piston rod of the push cylinder (11) of the positioning and pushing assembly (9) to retract to the left. The piston rod drives the back plate (12) to move to the left. The back plate (12) drives the support bar (13), the printed circuit board (1) and the rotary cylinder (22) to move to the left synchronously. The printed circuit board (1) drives the two large-size capacitors to move to the left synchronously. After the piston rod of the push cylinder (11) is fully retracted, the worker controls the rotary cylinder (22) to start. The rotary cylinder (22) drives the rotary plate (23) to rotate, and the rotary plate (23) is separated from the printed circuit board (1). When the rotary plate (23) rotates 180°, the controller controls the rotary cylinder (22) to close; S52. The worker lifts the printed circuit board (1) upward to make it away from the support bar (13), and then the worker takes away the printed circuit board (1) with two large-size capacitors welded thereon; S6. The worker repeats the operations of steps S1 to S5 multiple times, and two large-size capacitors can be continuously welded on multiple printed circuit boards (1). After welding, the circuit board manufacturer supplies the welded printed circuit boards (1) to customers for use.

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