CN116944618A

CN116944618A - Welding device for surface mounting of flexible circuit board and control method thereof

Info

Publication number: CN116944618A
Application number: CN202311106106.5A
Authority: CN
Inventors: 刘绪愿; 黄庆
Original assignee: Shenzhen Xindahui Flex Circuit Technology Co ltd
Current assignee: Shenzhen Xindahui Flex Circuit Technology Co ltd
Priority date: 2023-08-30
Filing date: 2023-08-30
Publication date: 2023-10-27

Abstract

The invention relates to the technical field of circuit board processing, in particular to a welding device for surface mounting of a flexible circuit board and a control method thereof. The welding device comprises a workbench, wherein a welding groove is formed in the top of the workbench, a welding spot adjusting unit is arranged on one side of the welding groove, the welding spot adjusting unit comprises a bidirectional sliding table, the bidirectional sliding table is positioned right above the welding groove, and two groups of welding units are symmetrically arranged at the bottom of the bidirectional sliding table by taking the central axis of the bidirectional sliding table as the center; the welding unit comprises a sliding block; the sliding block is in sliding connection with the bottom of the bidirectional sliding table, a vertical rod is arranged at the bottom of the sliding block, and a transverse rod is arranged at the edge of the bottom of a side wall of the vertical rod far away from the central axis of the bidirectional sliding table. The invention not only improves the compatibility of the welding unit and the efficiency of the welding work, but also improves the quality of the welding work; residual soldering flux in the soldering flux dripper is prevented from leaking, the solder wires are prevented from being liquefied by the uncooled soldering joint, and material waste is reduced.

Description

Welding device for surface mounting of flexible circuit board and control method thereof

Technical Field

The invention belongs to the technical field of circuit board processing, and particularly relates to a welding device for surface mounting of a flexible circuit board and a control method thereof.

Background

In the production of flexible circuit boards, it is necessary to solder electronic components to the surface thereof using a soldering device. Thereby realizing the passage of the circuit.

Through the search, quoted publication number CN116275352A, publication day 2023, 5 month 22 day, patent literature of a welding device for a printed circuit board, which comprises an operation table, wherein a support rod is fixedly connected to the top of the operation table near the rear end, a hydraulic propulsion rod is fixedly connected to the top of the support rod, a power fixing lock is arranged on one side of the hydraulic propulsion rod, a hydraulic lifting rod is fixedly connected to the power fixing lock, and the hydraulic lifting rod is used for adjusting the position of the power fixing lock. According to the embodiment, the surface of the hot-melt pipe can be cleaned through the polishing assembly, so that the problem that the next welding is blocked due to solidification of residues left on the outer side after the welding of the hot-melt pipe is finished is solved.

The above embodiments still have the following drawbacks:

the welding position needs to be manually adjusted, only one row of pins of the electronic element can be welded at a time, and the soldering flux needs to be manually added, so that the working efficiency is low, the welding quality is reduced, and the material is wasted.

Disclosure of Invention

The invention provides a welding device for surface mounting of a flexible circuit board, which comprises a workbench, wherein a welding groove is formed in the top of the workbench, a welding spot adjusting unit is arranged on one side of the welding groove and comprises a two-way sliding table, the two-way sliding table is positioned right above the welding groove, and two groups of welding units are symmetrically arranged at the bottom of the two-way sliding table by taking the central axis of the two-way sliding table as the center;

the welding unit comprises a sliding block; the sliding block is connected to the bottom of the bidirectional sliding table in a sliding way, a vertical rod is arranged at the bottom of the sliding block, a cross rod is arranged at the edge of the bottom of one side wall of the vertical rod, which is far away from the central axis of the bidirectional sliding table, and a motor mounting plate is arranged at the edge of the bottom of the other end of the cross rod; a soldering flux storage box is arranged on the motor mounting plate; the motor mounting plate is provided with a first motor, one side of the motor mounting plate, which is close to the central axis of the bidirectional sliding table, is provided with an oblique connector, and the oblique connector is connected to the output end of the first motor in a transmission way; the welding head is characterized in that the oblique connector is arranged in a downward inclined mode, a welding head connecting plate is arranged at the port of the other end of the oblique connector, a welding head is arranged on the welding head connecting plate, a soldering flux dripper is arranged on one side of the welding head, and the soldering flux dripper is communicated with a soldering flux storage box.

Furthermore, a plurality of groups of fixed block clamping grooves are evenly distributed in the welding groove, a group of air outlet strips are arranged between two adjacent groups of fixed block clamping grooves, the top section of each air outlet strip is of a fan-shaped annular structure, and a plurality of groups of air outlets are radially formed in the top of each air outlet strip; the welding groove is provided with a group of ball rolling pipes at the edges of the tops of two sides perpendicular to the welding spot adjusting unit, a first ball rolling groove is formed in the top of the ball rolling pipe, a first feeding ball is connected in the first ball rolling groove in a rolling manner, and the top of the first feeding ball extends to the outside of the first ball rolling groove.

Further, the welding spot adjusting unit further comprises a stand column, the stand column is arranged on one side of the welding groove, a first top plate is arranged at the top of the stand column, the other end of the first top plate extends to the position right above the welding groove, a first electric push rod is arranged at the bottom of the first top plate, the bidirectional sliding table is arranged at the bottom of the first electric push rod, and the bidirectional sliding table comprises a longitudinal sliding table and a transverse sliding table which are perpendicular to each other.

Further, two sides of the workbench, which are perpendicular to the welding spot adjusting unit, are respectively provided with a feeding unit and a discharging unit; the feeding unit comprises a feeding box; the feeding box is close to a side wall of the workbench and is provided with a feeding opening, the feeding box is far away from a side wall of the workbench and is provided with a pushing opening, a pushing plate mounting frame is mounted on the outer wall of the pushing opening, a second electric push rod is arranged on the pushing plate mounting frame close to a side wall of the pushing opening along the horizontal direction, a pushing plate is arranged at the output end of the second electric push rod, a shovel plate is arranged on the pushing plate close to the edge of the bottom of the side wall of the pushing opening along the horizontal direction, and the bottom of the shovel plate is the same as the top of the first feeding rolling ball in height.

Further, a third electric push rod is arranged on the inner wall of the bottom of the feeding box, a feeding table is arranged at the top of the third electric push rod, a first far infrared emitter and a first far infrared receiver are symmetrically arranged on two sides of the feeding table, and the first far infrared receiver is electrically connected with the first far infrared emitter, the second electric push rod and the third electric push rod; the top of the feeding table is the same as the bottom of the shovel plate in height.

Further, a plurality of groups of circuit board fixing units are movably arranged in the welding groove; the circuit board fixing unit comprises a clamping block; the clamping blocks are movably clamped in any group of clamping grooves of the fixed blocks, the top of each clamping block is provided with an extension rod, and a plurality of groups of first limiting holes are distributed on the side wall of each extension rod in an annular array; the extension rod is sleeved with a lower pressing plate limiting ring, the lower pressing plate limiting ring is formed by mutually clamping two groups of semi-annular structure clamping rings, a group of inserting rods are arranged on the inner walls of the clamping rings, and the two groups of inserting rods are movably clamped in any one group of first limiting holes.

Further, a sliding rod is arranged at the top of the extension rod, a sliding ring is connected to the sliding rod in a sliding manner, and a plurality of groups of second limiting holes are distributed on the sliding ring in an annular array; the slip ring is sleeved with an upper pressing plate limiting ring, the structure of the upper pressing plate limiting ring is identical to that of the lower pressing plate limiting ring, and two groups of inserting rods of the upper pressing plate limiting ring are movably clamped in any one group of second limiting holes.

Further, a second top plate is arranged at the top of the sliding rod, a fourth electric push rod is arranged at the bottom of the second top plate, and the bottom of the fourth electric push rod is movably arranged on the limiting ring of the upper pressing plate; the first material pressing mechanism and the second material pressing mechanism are symmetrically arranged on the same side wall of the lower material pressing plate limiting ring and the upper material pressing plate limiting ring; the first material pressing mechanism and the second material pressing mechanism are identical in structure.

Further, a tin feeding mechanism is arranged on one side wall of the motor mounting plate, which is perpendicular to the oblique connector; a miniature camera is arranged right above the welding head; the miniature camera is electrically connected with the tin feeding mechanism.

A control method of a soldering apparatus for surface mounting of a flexible circuit board, the control method comprising:

the sand purifying assembly comprises a third shell, a dryer, a dehumidifying pipe and a magnetic screen mechanism;

fixing the flexible circuit board on the welding groove;

starting a bidirectional sliding table, and respectively transmitting two groups of welding units to two rows of pins of the electronic element;

starting the first electric push rod to enable the two groups of welding units to descend until the soldering flux drippers are contacted with one group of pins at the edge;

opening a switch of the soldering flux storage box, and conveying the soldering flux in the soldering flux storage box into a soldering flux dripper;

starting a welding head heating component, and heating the temperature of the welding head to be above the temperature;

starting a bidirectional sliding table, driving two groups of soldering flux drippers and two groups of welding heads to horizontally move to one side of the soldering flux drippers through the bidirectional sliding table, sequentially contacting with two rows of pins of an electronic element, firstly smearing soldering flux on the pins, and then smearing liquefied soldering wires on the pins through the welding heads;

after the welding is finished, the first motor is started, and the first motor is utilized to drive the inclined connector to rotate until the output ends of the welding head and the soldering flux dripper incline upwards.

The beneficial effects of the invention are as follows:

1. the two groups of welding heads oppositely arranged are driven to move through the bidirectional sliding table, the welding points of the two groups of welding heads can be adjusted no matter where the welding points are located and how the width of the electronic component is, the two groups of welding heads can simultaneously weld the two groups of pins of the electronic component, and the working efficiency is improved. During welding, the welding head and the soldering flux dripper incline downwards, soldering flux is smeared on the pins of the electronic element through the soldering flux dripper, and then liquid tin is smeared on the pins through the welding head, so that the compatibility of a welding unit and the efficiency of welding work are improved, and the quality of the welding work is improved. When the device is idle, the first motor drives the oblique connector to rotate so that the welding head and the soldering flux dripper incline upwards, residual soldering flux in the soldering flux dripper is prevented from leaking, the solder wires are prevented from being liquefied by the uncooled welding head, and the material waste is reduced.

2. The servo motor drives the two groups of stirring rollers to rotate and stirs the end head of the soldering tin wire to move to one side of the soldering joint. Then catch the solder wire image through miniature camera, stop the feed work of solder wire when miniature camera catches the solder wire, when miniature camera can not catch the solder wire image, then open the feed work of solder wire, not only need not handheld solder wire, can feed at work again simultaneously, reduced intensity of labour.

3. When feeding, the rolling of the second feeding rolling ball is utilized to improve feeding fluency, and when the flexible circuit board is required to be limited, the upper material pressing plate limiting ring descends to enable the two groups of material pressing plates to simultaneously abut against the upper side wall and the lower side wall of the flexible circuit board. And then the rolling table moves into the lifting groove by utilizing the extrusion of the flexible circuit board, so that each group of supporting rods can be abutted against the bottom of the second feeding rolling ball, thereby limiting the second feeding rolling ball and preventing the second feeding rolling ball from rotating. The feeding smoothness can be improved during feeding, and meanwhile, the contact area between the pressing plate and the flexible circuit board is reduced by utilizing the spherical second feeding rolling ball, so that the clamping force for fixing the flexible circuit board is improved.

4. During welding, the welding head and the soldering flux dripper incline downwards, soldering flux is smeared on the pins of the electronic element through the soldering flux dripper, and then liquid tin is smeared on the pins through the welding head, so that the compatibility of a welding unit and the efficiency of welding work are improved, and the quality of the welding work is improved.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 shows a schematic cross-sectional view of a welding apparatus according to an embodiment of the invention;

FIG. 2 shows a schematic structural view of a workbench according to an embodiment of the invention;

FIG. 3 shows an enlarged schematic view within circle A of FIG. 2 in accordance with an embodiment of the invention;

fig. 4 shows a schematic rear view of a feeding unit according to an embodiment of the present invention;

FIG. 5 shows an enlarged schematic view of the inside of circle B of FIG. 4, in accordance with an embodiment of the invention;

FIG. 6 shows a schematic cross-sectional view of a charging box according to an embodiment of the invention;

fig. 7 shows a schematic structural view of a circuit board fixing unit according to an embodiment of the present invention;

fig. 8 shows a schematic structural view of a first pressing mechanism according to an embodiment of the present invention;

FIG. 9 shows a schematic cross-sectional view of a first press mechanism according to an embodiment of the invention;

fig. 10 shows a schematic structural view of a welding unit according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of a welding unit according to an embodiment of the invention when not in use;

FIG. 12 shows a schematic cross-sectional view of an end port of a tin feed mechanism in accordance with an embodiment of the invention;

fig. 13 shows a schematic cross-sectional view of a blanking unit according to an embodiment of the present invention.

In the figure: 100. a work table; 110. a welding groove; 111. a fixed block clamping groove; 112. an air outlet strip; 120. a roller tube; 121. a first feed roller ball; 200. a welding spot adjusting unit; 210. a column; 220. a first top plate; 230. a first electric push rod; 240. a longitudinal sliding table; 250. a transverse sliding table; 300. a feeding unit; 310. feeding a material box; 311. a feeding port; 312. a pushing port; 320. a push plate mounting rack; 330. a second electric push rod; 340. a pushing plate; 341. a shovel plate; 350. a third electric push rod; 360. a feeding table; 370. a first far infrared emitter; 380. a first far infrared receiver; 400. a circuit board fixing unit; 410. a clamping block; 420. an extension rod; 421. a first limiting hole; 430. a lower pressing plate limiting ring; 440. a rod; 450. a slide bar; 451. a slip ring; 452. a second limiting hole; 460. a limiting ring of a pressing plate is arranged; 470. a second top plate; 480. a fourth electric push rod; 490. a first pressing mechanism; 491. a pressing plate; 4911. a lifting groove; 492. a return spring; 493. a supporting rod; 494. a ball table; 495. a second ball groove; 496. a second feed roller ball; 497. a lower through groove; 500. a welding unit; 510. a slide block; 520. a vertical rod; 521. a cross bar; 530. a solder roller fixing table; 531. a solder wire through hole; 540. a motor mounting plate; 550. a flux reservoir; 560. a first motor; 570. a tin feeding mechanism; 571. a tin feeding pipe; 572. a servo motor; 573. bevel gears; 574. a loop bar; 575. a stirring roller; 576. an arc groove; 577. a shifting block; 578. bevel gear; 580. an oblique connector; 581. a welding head connecting plate; 582. a welding head; 583. flux dripper; 590. a miniature camera; 600. a blanking unit; 610. discharging boxes; 620. a fifth electric push rod; 630. a blanking table; 640. a second far infrared emitter; 650. and a second far infrared receiver.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The embodiment of the invention provides a welding device for surface mounting of a flexible circuit board, which comprises a workbench 100. As shown in fig. 1, for example, a welding groove 110 is formed at the top of the workbench 100, a welding spot adjusting unit 200 is installed at one side of the welding groove 110, and two groups of welding units 500 are symmetrically disposed at the output end of the welding spot adjusting unit 200. The welding point adjusting unit 200 is used to adjust the position of the welding unit 500.

The two sides of the workbench 100 perpendicular to the welding spot adjusting unit 200 are respectively provided with a feeding unit 300 and a discharging unit 600. Automatic feeding and discharging work of the flexible circuit board is realized through the feeding unit 300 and the discharging unit 600.

A plurality of groups of circuit board fixing units 400 are movably installed in the soldering bath 110.

As shown in fig. 2 and 3, a plurality of groups of fixing block clamping grooves 111 are evenly distributed in the welding groove 110, a group of air outlet strips 112 are respectively arranged between two adjacent groups of fixing block clamping grooves 111, the top section of each air outlet strip 112 is in a fan-shaped annular structure, and a plurality of groups of air outlets are radially formed in the top of each air outlet strip. A group of ball rolling pipes 120 are respectively arranged at the top edges of two sides of the welding groove 110 perpendicular to the welding spot adjusting unit 200, a first ball rolling groove is formed at the top of the ball rolling pipe 120, a first feeding ball 121 is connected in the first ball rolling groove in a rolling way, and the top of the first feeding ball 121 extends to the outside of the first ball rolling groove.

By arranging the welding groove 110, the flexible circuit board is in a suspended state during welding, and then cold air is blown out through the air outlet strip 112 so as to cool the flexible circuit board. Deformation of the flexible circuit board caused by high welding temperature is avoided. And the circuit board fixing units 400 of each group can be fixed at any position through the plurality of groups of fixing block clamping grooves 111 which are evenly distributed, so that the fixing work of flexible circuit boards with different sizes can be satisfied, and the compatibility of the flexible circuit boards is improved.

For example, as shown in fig. 2, the welding spot adjusting unit 200 includes a stand column 210, the stand column 210 is mounted on one side of the welding groove 110 perpendicular to the feeding unit 300, a first top plate 220 is mounted on the top of the stand column 210, the other end of the first top plate 220 extends to a position right above the welding groove 110, a first electric push rod 230 is disposed at the bottom of the first top plate 220, a bidirectional sliding table is disposed at the bottom of the first electric push rod 230, and the bidirectional sliding table includes a longitudinal sliding table 240 and a transverse sliding table 250 which are disposed perpendicularly to each other.

The positions of the two groups of welding units 500 in the horizontal direction and the intervals between the two groups of welding units 500 can be adjusted at will through the longitudinal sliding table 240 and the transverse sliding table 250, and the welding of the flexible circuit board can be realized no matter the size of the flexible circuit board, the welding position and the size of the electronic component, so that the applicability of the flexible circuit board is further improved.

The feeding unit 300 includes a feeding box 310. As shown in fig. 4, 5 and 6, the feeding box 310 is located on one side of the workbench 100 perpendicular to the upright 210, a feeding opening 311 is formed in a side wall of the feeding box 310, which is close to the workbench 100, a pushing opening 312 is formed in a side wall of the feeding box 310, which is far away from the workbench 100, a push plate mounting frame 320 is mounted on an outer wall of the pushing opening 312, a second electric push rod 330 is horizontally arranged on a side wall, which is close to the pushing opening 312, of the push plate mounting frame 320, a pushing plate 340 is arranged on an output end of the second electric push rod 330, a shovel plate 341 is horizontally arranged at an edge, which is close to the bottom of the side wall, of the pushing plate 340, and the bottom of the shovel plate 341 is the same as the top of the first feeding roller 121. The third electric push rod 350 is installed on the inner wall of the bottom of the feeding box 310, the feeding table 360 is installed at the top of the third electric push rod 350, the first far infrared emitter 370 and the first far infrared receiver 380 are symmetrically installed on two sides of the feeding table 360, and the first far infrared receiver 380 is electrically connected with the first far infrared emitter 370, the second electric push rod 330 and the third electric push rod 350. The top of the feeding table 360 is the same as the bottom of the shovel 341.

Firstly, according to the size of the flexible circuit board, each group of circuit board fixing units 400 are respectively inserted into the corresponding groups of fixing block clamping grooves 111, then the flexible circuit boards to be welded are piled up to form a vertical column and are all placed on the feeding table 360, then the third electric push rod 350 is started, each group of flexible circuit boards are driven to descend through the third electric push rod 350 until the lower surface of the uppermost group of flexible circuit boards is flush with the lower surface of the shovel 341. Then, the second electric push rod 330 is started to drive the pushing plate 340 to move into the cavity of the upper feed box 310, and then the uppermost group of flexible circuit boards are pushed to move to one side of the workbench 100, and meanwhile, the uppermost group of flexible circuit boards are separated from the adjacent group of flexible circuit boards below the uppermost group of flexible circuit boards through the shovel plate 341, so that the adjacent group of flexible circuit boards below the uppermost group of flexible circuit boards are prevented from being pushed out simultaneously during pushing. When the flexible circuit board moves onto the workbench 100, the flexible circuit board contacts with the first feeding rolling ball 121 and generates rolling friction, and as the top height of the first feeding rolling ball 121 is the same as the height of the lower surface of the group of flexible circuit boards, the friction force between the surface of the workbench 100 and the flexible circuit boards can be reduced through the first feeding rolling ball 121, and meanwhile, the flexible circuit boards can be prevented from tilting during pushing, so that the smoothness of pushing work is improved, and the stability of pushing work is also improved.

The circuit board fixing unit 400 includes a clamping block 410. As shown in fig. 7 and 8, the clamping block 410 is movably clamped in any one group of the fixing block clamping grooves 111, an extension rod 420 is disposed at the top of the clamping block 410, and a plurality of groups of first limiting holes 421 are distributed on the side wall of the extension rod 420 in an annular array. The extension rod 420 is sleeved with a lower pressing plate limiting ring 430, the lower pressing plate limiting ring 430 is formed by mutually clamping two groups of semi-annular structure clamping rings, a group of inserting rods 440 are arranged on the inner walls of the clamping rings, and the two groups of inserting rods 440 are movably clamped in any one group of first limiting holes 421. The top of the extension rod 420 is provided with a sliding rod 450, the sliding rod 450 is slidably connected with a sliding ring 451, and a plurality of groups of second limiting holes 452 are distributed on the sliding ring 451 in an annular array. The slip ring 451 is sleeved with an upper pressing plate limiting ring 460, the structure of the upper pressing plate limiting ring 460 is identical to that of the lower pressing plate limiting ring 430, and two sets of inserting rods 440 of the upper pressing plate limiting ring 460 are movably clamped in any one set of second limiting holes 452.

Illustratively, a second top plate 470 is disposed on top of the sliding rod 450, a fourth electric push rod 480 is disposed at the bottom of the second top plate 470, and the bottom of the fourth electric push rod 480 is movably mounted on the upper pressing plate limiting ring 460. The first pressing mechanism 490 and the second pressing mechanism are symmetrically arranged on the same side wall of the lower pressing plate limiting ring 430 and the upper pressing plate limiting ring 460. The first pressing mechanism 490 and the second pressing mechanism have the same structure.

The first pressing mechanism 490 includes a pressing plate 491. Illustratively, as shown in fig. 9, the pressure plate 491 is mounted on the lower pressure plate limiting ring 430, a lifting groove 4911 is formed at the top of the pressure plate 491, a return spring 492 is arranged on the inner wall at the bottom of the lifting groove 4911, a ball table 494 is mounted at the top of the return spring 492, and the top of the ball table 494 extends to the outside of the lifting groove 4911. A second ball groove 495 is formed at the top of the ball table 494, a second feeding ball 496 is connected in the second ball groove 495 in a rolling manner, the top of the second feeding ball 496 extends to the outside of the second ball groove 495, and a lower through groove 497 is formed at the bottom of the second ball groove 495. A plurality of groups of supporting rods 493 are evenly distributed at the center of the inner wall of the bottom of the lifting groove 4911, and the top of each group of supporting rods 493 extends into the second ball groove 495 through the lower through groove 497 and is movably abutted against the second feeding ball 496. The top of the second feed ball 496 is the same height as the top of the first feed ball 121.

Each set of clamping blocks 410 is clamped in a corresponding set of fixing block clamping grooves 111 according to the size of the flexible circuit board, then the material pressing plate 491 faces the central axis direction of the welding groove 110, and the lower material pressing plate limiting ring 430 and the upper material pressing plate limiting ring 460 are respectively arranged on the extension rod 420 and the sliding ring 451. And allows each set of the inserting rods 440 to be inserted into a corresponding set of the first limiting holes 421 and the second limiting holes 452. When the pushing plate 340 pushes the flexible circuit board onto the soldering groove 110, the top of the second feeding roller 496 is the same as the top of the first feeding roller 121, so that the peripheral edges of the flexible circuit board just fall on the second feeding roller 496 of each group. Then, the fourth electric push rod 480 is started to drive the upper pressing plate limiting ring 460 to descend, so that the first pressing mechanism 490 and the second pressing mechanism simultaneously abut against the upper side wall and the lower side wall of the flexible circuit board. Then, the ball table 494 is moved into the lifting groove 4911 by the extrusion of the flexible circuit board, so that each group of supporting rods 493 can be abutted against the bottom of the second feeding ball 496, thereby limiting the second feeding ball 496 and preventing the second feeding ball from rotating.

When feeding, the feeding fluency is improved by utilizing the rolling of the second feeding rolling ball 496, and when the flexible circuit board is required to be limited, the upper material pressing plate limiting ring 460 descends so that the two groups of material pressing plates 491 are simultaneously abutted against the upper side wall and the lower side wall of the flexible circuit board. Then, the ball table 494 is moved into the lifting groove 4911 by the extrusion of the flexible circuit board, so that each group of supporting rods 493 can be supported on the bottom of the second feeding ball 496, thereby limiting the second feeding ball 496 and preventing the second feeding ball from rotating. The feeding fluency can be improved during feeding, and meanwhile, the contact area between the pressing plate 491 and the flexible circuit board is reduced by utilizing the spherical second feeding rolling ball 496, so that the clamping force for fixing the flexible circuit board is improved.

The welding unit 500 includes a slider 510. As shown in fig. 10 and 11, the sliding block 510 is slidably connected to the bottom of the bidirectional sliding table, a vertical rod 520 is provided at the bottom of the sliding block 510, a cross rod 521 is installed at the bottom edge of a side wall of the vertical rod 520 away from the central axis of the bidirectional sliding table, and a motor mounting plate 540 is provided at the bottom edge of the other end of the cross rod 521. The cross bar 521 is provided with a solder roll fixing table 530, and the solder roll fixing table 530 is provided with a solder wire through hole 531. The motor mounting plate 540 is provided with a flux reservoir 550. The motor mounting plate 540 is provided with a first motor 560, one side of the motor mounting plate 540, which is close to the central axis of the bidirectional sliding table, is provided with an oblique connector 580, and the oblique connector 580 is in transmission connection with the output end of the first motor 560. The oblique connector 580 is arranged in a downward inclined mode, a welding head connecting plate 581 is arranged at the port of the other end of the oblique connector 580, a welding head 582 is arranged on the welding head connecting plate 581, a soldering flux dripper 583 is arranged on one side of the welding head 582, and the soldering flux dripper 583 is communicated with the soldering flux storage box 550. A tin feeding mechanism 570 is arranged on one side wall of the motor mounting plate 540 perpendicular to the oblique connector 580. A miniature camera 590 is disposed directly above the weld joint 582.

The tin feeding mechanism 570 includes a tin feeding pipe 571. Illustratively, as shown in fig. 12, the tin feeding pipe 571 is mounted on a side wall of the motor mounting plate 540 perpendicular to the diagonal connector 580, and the output end of the tin feeding pipe 571 extends horizontally toward the output port of the soldering joint 582. A servo motor 572 is mounted on the side wall of the tin feeding tube 571, and the output end of the servo motor 572 extends into the tin feeding tube 571 and is in transmission connection with a bevel gear 573. Two sets of loop bars 574 are symmetrically arranged in the tin feeding pipe 571 along the central axis in the horizontal direction, a set of material stirring roller 575 is rotatably sleeved on each loop bar 574, and an arc groove 576 with a fan-shaped cross section in overlooking mode is arranged at the center of the material stirring roller 575. A plurality of groups of poking blocks 577 are distributed in the arc groove 576 in an annular array. A set of stirring rollers 575 near the bevel gear 573 are sleeved with a bevel gear 578, and the bevel gear 578 is in meshed connection with the bevel gear 573. The servo motor 572 is electrically connected to the miniature camera 590.

First, the solder roll wound with the solder wire is rotatably sleeved on the solder roll fixing table 530, and then one end of the solder wire is inserted through the solder wire through hole 531 and extends between the two groups of arc grooves 576. The electronic component is placed in a position where mounting is required, and then the two-way sliding table is started to move the two groups of welding heads 582 to pins on two sides of the electronic component respectively. The first electric push rod 230 is started again, and the bidirectional sliding table and the two groups of welding units 500 are driven to descend until the two groups of welding heads 582 are in contact with the pins at the two sides. At the same time, the servo motor 572 is started, the bevel gear 573 is driven to rotate by the servo motor 572, the bevel gear 578 and the two groups of stirring rollers 575 are enabled to rotate, and then the stirring block 577 is utilized to stir the solder wire, so that one end of the solder wire moves to the side of the welding head 582. When the wire port contacts the soldering head 582, the miniature camera 590 located directly above it captures the screen of the wire and sends a signal to the servo motor 572 via its internal signal transmission module to stop stirring the wire. The heating element of the soldering tip 582 and the output of the flux reservoir 550 are then activated, causing the soldering tip 582 to rise to a temperature above 400 c and melt the solder wire to a liquid state, and also causing the flux in the flux reservoir 550 to enter the flux drip 583. The longitudinal slide 240 is then actuated, which moves the soldering tip 582 and the flux head 583 horizontally to the flux head 583 side. While moving, the soldering flux is first applied to the electronic component pins by the soldering flux dripper 583, and then the liquid tin is applied to the pins by the soldering head 582, thereby completing the mounting and soldering work.

The two groups of welding heads 582 which are oppositely arranged are driven by the bidirectional sliding table to move at will, and no matter which part of the flexible circuit board the welding point is can be automatically adjusted. Meanwhile, the distance between the two groups of welding heads 582 can be randomly adjusted according to the width of the electronic component, so that the two groups of welding heads 582 can weld the two groups of pins of the electronic component at the same time, and the working efficiency is improved. During welding, the welding head 582 and the soldering flux dripper 583 incline downwards, firstly, the soldering flux is smeared on the pins of the electronic component through the soldering flux dripper 583, then, the liquid tin is smeared on the pins through the welding head 582, and the welding quality is ensured while no soldering flux is smeared, so that the compatibility of the welding unit 500 and the welding efficiency are improved, and the welding quality is improved.

The servo motor 572 drives the two groups of material stirring rollers 575 to rotate and stirs the solder wire end to move towards the side of the welding head 582. Then capture the solder wire image through miniature camera 590, stop the feed work of solder wire when miniature camera 590 catches the solder wire, when miniature camera 590 did not catch the solder wire image, then open the feed work of solder wire, not only need not handheld solder wire, but also can feed at work simultaneously, both improved degree of automation, reduced intensity of labour again.

The discharging unit 600 includes a discharging box 610. Illustratively, as shown in fig. 13, the blanking box 610 is located at a side of the table 100 away from the loading unit 300. The blanking box 610 is provided with a blanking opening on a side wall close to the workbench 100. A fifth electric push rod 620 is installed on the inner wall of the bottom of the discharging box 610, a discharging table 630 is installed at the top of the fifth electric push rod 620, and the top height of the discharging table 630 is the same as the top height of the first feeding rolling ball 121. The two sides of the blanking table 630 are symmetrically provided with a second far infrared emitter 640 and a second far infrared receiver 650, and the second far infrared receiver 650 is electrically connected with the second far infrared emitter 640 and the fifth electric push rod 620 respectively.

After the welding is completed, the second pressing mechanism is lifted, the extrusion of the flexible circuit board to the ball tables 494 of each group is released, and the ball tables 494 are moved to the outer sides of the lifting grooves 4911 under the action of the return springs 492, so that the supporting rods 493 of each group are separated from the second feeding balls 496. And the bottom of the flexible circuit board is made flush again with the top of each set of first feed rollers 121. Then, the second electric push rod 330 is started, and the flexible circuit board is pushed onto the blanking table 630 through the pushing plate 340. Because the flexible circuit board forms a shielding between the second far infrared emitter 640 and the second far infrared receiver 650, the second far infrared receiver 650 cannot receive the far infrared signal emitted by the second far infrared emitter 640, and then the signal transmission module in the second far infrared emitter 640 will send a signal to the fifth electric push rod 620 to make it work, and drive the blanking table 630 and the flexible circuit board to descend. Until the upper surface of the flexible circuit board is flush with the top of the first feed roller 121.

The above embodiment has the following advantages:

1. the two groups of welding heads 582 which are oppositely arranged are driven to move through the bidirectional sliding table, the welding points of the two groups of welding heads 582 can be adjusted no matter where the welding points are located and how the width of the electronic component is, the two groups of welding heads 582 can also weld two groups of pins of the electronic component at the same time, and the working efficiency is improved. During welding, the welding head 582 and the soldering flux drip head 583 incline downwards, the soldering flux is smeared on the pins of the electronic component through the soldering flux drip head 583, and then liquid tin is smeared on the pins through the welding head 582, so that the compatibility of the welding unit 500 and the efficiency of welding work are improved, and the quality of the welding work is improved. When the device is idle, the first motor 560 drives the oblique connector 580 to rotate so that the welding head 582 and the soldering flux dripper 583 incline upwards, so that residual soldering flux in the soldering flux dripper is prevented from leaking, the solder wires are prevented from being liquefied by the uncooled welding head 582, and the material waste is reduced.

2. The servo motor 572 drives the two groups of material stirring rollers 575 to rotate and stirs the solder wire end to move towards the side of the welding head 582. Then capture the solder wire image through miniature camera 590, stop the feed work of solder wire when miniature camera 590 catches the solder wire, when miniature camera 590 did not catch the solder wire image, then open the feed work of solder wire, not only need not handheld solder wire, but also can feed in work simultaneously, reduced intensity of labour.

3. When feeding, the feeding fluency is improved by utilizing the rolling of the second feeding rolling ball 496, and when the flexible circuit board is required to be limited, the upper material pressing plate limiting ring 460 descends so that the two groups of material pressing plates 491 are simultaneously abutted against the upper side wall and the lower side wall of the flexible circuit board. Then, the ball table 494 is moved into the lifting groove 4911 by the extrusion of the flexible circuit board, so that each group of supporting rods 493 can be supported on the bottom of the second feeding ball 496, thereby limiting the second feeding ball 496 and preventing the second feeding ball from rotating. The feeding fluency can be improved during feeding, and meanwhile, the contact area between the pressing plate 491 and the flexible circuit board is reduced by utilizing the spherical second feeding rolling ball 496, so that the clamping force for fixing the flexible circuit board is improved.

4. The feeding unit 300 and the discharging unit 600 are respectively arranged at two sides of the workbench 100, and the pushing work is completed by utilizing the pushing plate 340, so that manual feeding and discharging are not needed, and the automation degree of the device is improved.

5. By arranging the welding groove 110, the flexible circuit board is in a suspended state during welding, and then cold air is blown out through the air outlet strip 112 so as to cool the flexible circuit board. Deformation of the flexible circuit board caused by high welding temperature is avoided. And the circuit board fixing units 400 of each group can be fixed at any position through the plurality of groups of fixing block clamping grooves 111 which are evenly distributed, so that the fixing work of flexible circuit boards with different sizes can be satisfied, and the compatibility of the flexible circuit boards is improved.

6. When the flexible circuit board moves onto the workbench 100, the flexible circuit board contacts with the first feeding rolling ball 121 and generates rolling friction, and as the top height of the first feeding rolling ball 121 is the same as the height of the lower surface of the group of flexible circuit boards, the friction force between the surface of the workbench 100 and the flexible circuit boards can be reduced through the first feeding rolling ball 121, and meanwhile, the flexible circuit boards can be prevented from tilting during pushing, so that the smoothness of pushing work is improved, and the stability of pushing work is also improved.

On the basis of the welding device for surface mounting of the flexible circuit board, the embodiment of the invention also provides a control method for the welding device, and the control method comprises the following steps:

according to the size of the flexible circuit board, inserting each group of circuit board fixing units into a corresponding group of fixing block clamping grooves;

stacking a batch of flexible circuit boards into a vertical column, placing the flexible circuit boards on a feeding table, and starting a third electric push rod to drive the flexible circuit boards to descend until the lower surface of the uppermost group of flexible circuit boards is level with the shovel board;

starting a second electric push rod, so that the push plate pushes the uppermost group of flexible circuit boards to the direction of the welding groove until the peripheral edges of the flexible circuit boards are respectively attached to the tops of the groups of second feeding rolling balls;

starting each group of fourth electric push rods to enable each group of second limiting mechanisms to descend and clamp the flexible circuit board in cooperation with each group of first limiting mechanisms;

starting a welding head heating component, and heating the temperature of the welding head to be more than 400 ℃;

after welding is finished, starting a first motor, and driving the inclined connector to rotate by using the first motor until the output ends of the welding head and the soldering flux dripper incline upwards;

starting each group of fourth electric push rods to drive each corresponding group of second pressing mechanisms to ascend;

and starting the second electric push rod, and pushing the flexible circuit board to the blanking table through the pushing plate.

During welding, the welding head and the soldering flux dripper incline downwards, soldering flux is smeared on the pins of the electronic element through the soldering flux dripper, and then liquid tin is smeared on the pins through the welding head, so that the compatibility of a welding unit and the efficiency of welding work are improved, and the quality of the welding work is improved.

Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a welding set is used in flexible circuit board surface mounting, includes workstation (100), its characterized in that: the welding device comprises a workbench (100), and is characterized in that a welding groove (110) is formed in the top of the workbench (100), a welding spot adjusting unit (200) is arranged on one side of the welding groove (110), the welding spot adjusting unit (200) comprises a bidirectional sliding table, the bidirectional sliding table is positioned right above the welding groove (110), and two groups of welding units (500) are symmetrically arranged at the bottom of the bidirectional sliding table by taking the central axis of the bidirectional sliding table as the center;

the welding unit (500) comprises a slider (510); the sliding block (510) is slidably connected to the bottom of the bidirectional sliding table, a vertical rod (520) is arranged at the bottom of the sliding block (510), a cross rod (521) is installed at the bottom edge of one side wall of the vertical rod (520) far away from the central axis of the bidirectional sliding table, and a motor mounting plate (540) is arranged at the bottom edge of the other end of the cross rod (521); a soldering flux storage box (550) is arranged on the motor mounting plate (540); the motor mounting plate (540) is provided with a first motor (560), one side of the motor mounting plate (540) close to the central axis of the bidirectional sliding table is provided with an oblique connector (580), and the oblique connector (580) is in transmission connection with the output end of the first motor (560); the oblique connector (580) is arranged in a downward inclined mode, a welding head connecting plate (581) is arranged at the port of the other end of the oblique connector, a welding head (582) is arranged on the welding head connecting plate (581), a soldering flux dripper (583) is arranged on one side of the welding head (582), and the soldering flux dripper (583) is communicated with a soldering flux storage box (550).

2. The welding device for surface mounting of a flexible circuit board according to claim 1, wherein: a plurality of groups of fixed block clamping grooves (111) are evenly distributed in the welding groove (110), a group of air outlet strips (112) are arranged between two adjacent groups of fixed block clamping grooves (111), the top section of each air outlet strip (112) is of a fan-shaped annular structure, and a plurality of groups of air outlets are radially formed in the top of each air outlet strip; a group of ball rolling pipes (120) are respectively arranged at the top edges of two sides of the welding groove (110) perpendicular to the welding spot adjusting unit (200), a first ball rolling groove is formed in the top of each ball rolling pipe (120), a first feeding ball (121) is connected in the first ball rolling groove in a rolling mode, and the top of each first feeding ball (121) extends to the outside of each first ball rolling groove.

3. The welding device for surface mounting of a flexible circuit board according to claim 1, wherein: the welding spot adjusting unit (200) further comprises a stand column (210), the stand column (210) is arranged on one side of the welding groove (110), a first top plate (220) is arranged at the top of the stand column (210), the other end of the first top plate (220) extends to the position right above the welding groove (110), a first electric push rod (230) is arranged at the bottom of the first top plate (220), a bidirectional sliding table is arranged at the bottom of the first electric push rod (230), and the bidirectional sliding table comprises a longitudinal sliding table (240) and a transverse sliding table (250) which are arranged vertically to each other.

4. The welding device for surface mounting of a flexible circuit board according to claim 1, wherein: two sides of the workbench (100) perpendicular to the welding spot adjusting unit (200) are respectively provided with a feeding unit (300) and a discharging unit (600); the feeding unit (300) comprises a feeding box (310); the feeding box (310) is close to a side wall of the workbench (100) and is provided with a feeding opening (311), the feeding box (310) is far away from a side wall of the workbench (100) and is provided with a pushing opening (312), a pushing plate mounting frame (320) is mounted on the outer wall of the pushing opening (312), the pushing plate mounting frame (320) is close to a side wall of the pushing opening (312) and is provided with a second electric push rod (330) along the horizontal direction, the output end of the second electric push rod (330) is provided with a pushing plate (340), the bottom edge of the side wall of the pushing plate (340) close to the pushing opening (312) is provided with a shovel plate (341) along the horizontal direction, and the bottom of the shovel plate (341) is identical with the top of the first feeding rolling ball (121).

5. The welding device for surface mounting of a flexible circuit board according to claim 4, wherein: a third electric push rod (350) is arranged on the inner wall of the bottom of the feeding box (310), a feeding table (360) is arranged at the top of the third electric push rod (350), a first far infrared emitter (370) and a first far infrared receiver (380) are symmetrically arranged on two sides of the feeding table (360), and the first far infrared receiver (380) is electrically connected with the first far infrared emitter (370), the second electric push rod (330) and the third electric push rod (350); the top of the feeding table (360) is the same as the bottom of the shovel plate (341).

6. The welding device for surface mounting of a flexible circuit board according to claim 2, wherein: a plurality of groups of circuit board fixing units (400) are movably arranged in the welding groove (110); the circuit board fixing unit (400) comprises a clamping block (410); the clamping blocks (410) are movably clamped in any group of fixed block clamping grooves (111), the tops of the clamping blocks (410) are provided with extension rods (420), and a plurality of groups of first limiting holes (421) are distributed on the side walls of the extension rods (420) in an annular array; the extension rod (420) is sleeved with a lower pressing plate limiting ring (430), the lower pressing plate limiting ring (430) is formed by mutually clamping two groups of semi-annular structure clamping rings, a group of inserting rods (440) are arranged on the inner walls of the clamping rings, and the two groups of inserting rods (440) are movably clamped in any one group of first limiting holes (421).

7. The welding device for surface mounting of a flexible circuit board according to claim 6, wherein: a sliding rod (450) is arranged at the top of the extension rod (420), a sliding ring (451) is connected to the sliding rod (450) in a sliding manner, and a plurality of groups of second limiting holes (452) are distributed on the sliding ring (451) in an annular array; the slip ring (451) is sleeved with an upper pressing plate limiting ring (460), the structure of the upper pressing plate limiting ring (460) is identical to that of the lower pressing plate limiting ring (430), and two groups of inserting rods (440) of the upper pressing plate limiting ring (460) are movably clamped in any one group of second limiting holes (452).

8. The welding device for surface mounting of a flexible circuit board according to claim 7, wherein: the top of the sliding rod (450) is provided with a second top plate (470), the bottom of the second top plate (470) is provided with a fourth electric push rod (480), and the bottom of the fourth electric push rod (480) is movably arranged on the upper pressing plate limiting ring (460); the same side wall of the lower material pressing plate limiting ring (430) and the upper material pressing plate limiting ring (460) is symmetrically provided with a first material pressing mechanism (490) and a second material pressing mechanism; the first material pressing mechanism (490) and the second material pressing mechanism are identical in structure.

9. The welding device for surface mounting of a flexible circuit board according to claim 1, wherein: a tin feeding mechanism (570) is arranged on one side wall of the motor mounting plate (540) perpendicular to the oblique connector (580); a miniature camera (590) is arranged right above the welding head (582); the miniature camera (590) is electrically connected with the tin feeding mechanism (570).

10. A control method of the soldering apparatus for surface mounting of a flexible circuit board according to any one of claims 1 to 9, characterized in that: the control method comprises the following steps:

the sand purifying assembly (8) comprises a third shell (801), a dryer (803), a dehumidifying pipe (804) and a magnetic screen mechanism (807);

fixing the flexible circuit board on the welding groove;