CN215360421U

CN215360421U - Automatic upset silk screen printing machine

Info

Publication number: CN215360421U
Application number: CN202121051254.8U
Authority: CN
Inventors: 叶钢华; 吴永强; 程祥艳
Original assignee: Winglung Huizhou Pcb Co ltd
Current assignee: Winglung Huizhou Pcb Co ltd
Priority date: 2021-05-17
Filing date: 2021-05-17
Publication date: 2021-12-31
Anticipated expiration: 2031-05-17

Abstract

The utility model relates to the technical field of PCB (printed circuit board) production equipment, in particular to an automatic overturning screen printing machine which comprises a machine table and a conveying device, wherein a first screen printing mechanism, a first drying mechanism, an overturning device, a second screen printing mechanism and a second drying mechanism are sequentially arranged on the machine table along the conveying direction of the conveying device, and two overturning devices are symmetrically arranged on two sides of the conveying device along the direction perpendicular to the conveying direction. The first silk-screen printing mechanism and the second silk-screen printing mechanism respectively comprise a silk-screen printing assembly arranged above the conveying device and lifting support assemblies symmetrically arranged on two sides of the conveying device, and the lifting support assemblies are provided with blocking parts. The machine table is provided with a positioning device. Because the two silk-screen printing mechanisms and the two drying mechanisms are arranged, the printing ink is completely dried, and the phenomenon of ink transfer is reduced; in addition, due to the fact that the turnover device and the positioning device are arranged, the PCB is corrected in displacement, screen printing accuracy and automation degree are improved, rejection rate and rework rate are further reduced, and production efficiency is improved.

Description

Automatic upset silk screen printing machine

Technical Field

The utility model relates to the technical field of PCB (printed circuit board) production equipment, in particular to an automatic overturning screen printing machine.

Background

In the circuit board manufacturing industry, characters with various colors are required to be printed on a board surface through a screen printing machine in a screen printing mode to mark basic information of a circuit board such as manufacturers, periods, component codes and the like. The character silk screen printing machine is used as a basic manufacturing tool of characters, the design and the construction of the character silk screen printing machine are directly related to the automation degree of a character process and the quality of a character silk screen printing effect, and the character silk screen printing machine is used as a primary tool for character manufacturing and has particularly important significance.

In the current production and manufacturing process of circuit board enterprises, there are two types of character screen printing machines for PCB (printed circuit board), namely a manual screen printing table and an automatic screen printing machine. Screen printing is printing by attaching a stencil with an image or pattern to a screen. When the carrier is placed directly under the screen with the template, the screen printing ink or paint is pressed by the scraper to pass through the mesh in the middle of the screen and is printed on the printing stock. The manual screen printing station manually coats ink on the screen plate by using a scraper, and the second surface is continuously coated after the ink is baked. The automatic silk screen printing machine uses a mechanical scraper for coating, thereby avoiding manual work. In order to ensure the operation precision, the automatic screen printer prints ink on the single surface of the PCB. Because the double-sided silk-screen printing process is required to be carried out separately, and the printing ink is easy to transfer in the moving process of the PCB, the rejection rate and the rework rate are high, and the production benefit is low.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model provides an automatic overturning screen printing machine. The automatic overturning screen printing machine solves the technical problems by being provided with two screen printing mechanisms, two drying devices and an overturning device and a positioning device arranged between the two screen printing mechanisms.

The utility model is realized by adopting the following scheme:

the utility model provides an automatic upset silk screen printing machine includes the board, sets up the conveyer on the board, has set gradually first silk screen printing mechanism, first stoving mechanism, turning device, second silk screen printing mechanism, second stoving mechanism along conveyer's direction of transfer on the board. The two turnover devices are symmetrically arranged on two sides of the conveying device along the direction perpendicular to the conveying direction. The first silk-screen printing mechanism and the second silk-screen printing mechanism respectively comprise a silk-screen component arranged above the conveying device and lifting supporting components symmetrically arranged on two sides of the conveying device, the lifting supporting components are located below the silk-screen component, and the lifting supporting components are provided with blocking parts. The machine table is also provided with a positioning device.

As a further improvement of the utility model, the two turnover devices respectively comprise a first turnover connecting rod mechanism and a second turnover connecting rod mechanism, wherein the first turnover connecting rod mechanism and the second turnover connecting rod mechanism are sequentially arranged along the conveying direction and are used for turning over the PCB.

As a further improvement of the present invention, the first turning link mechanism includes a first mounting vertical plate vertically disposed on the machine platform, a first turning stopper disposed on the first mounting vertical plate, and a first electric screw rod disposed along the horizontal direction. The first end of the first overturning blocking piece is rotatably connected with the first mounting vertical plate through a first pin shaft, and the second end of the first overturning blocking piece is movably connected with the movable end of the first electric screw rod through a first driving rod. The second turnover connecting rod mechanism comprises a second mounting vertical plate vertically arranged on the machine table, a second turnover stopper arranged on the second mounting vertical plate, and a second electric screw rod arranged along the horizontal direction. The first end of the second overturning blocking piece is rotatably connected with the second mounting vertical plate through a second pin shaft, and the second end of the second overturning blocking piece is movably connected with the movable end of the second electric screw rod through a second driving rod.

As another improvement of the present invention, the maximum turning angle of the second turning stop is less than 90 °, and the maximum turning angle of the second turning stop is complementary to the maximum turning angle of the first turning stop.

Furthermore, a first end of the first overturning blocking piece is provided with a first blocking part, and a first end of the second overturning blocking piece is provided with a second blocking part.

Furthermore, the lifting support component comprises a lifting support plate arranged on the machine table and a lifting driving piece used for driving the lifting support plate, and the blocking part is arranged on one side of the output end, close to the conveying direction, of the lifting support plate.

Furthermore, the first drying mechanism and the second drying mechanism both comprise an air outlet assembly arranged above the conveying device and an air heater arranged on the machine table. The air outlet assembly is connected with the air heater through a connecting pipe.

Further, the air outlet assembly is provided with an air outlet groove, and the direction of the air outlet groove is perpendicular to the conveying direction of the conveying mechanism.

Furthermore, the positioning device comprises two positioning assemblies symmetrically arranged on two sides of the conveying device, a bidirectional screw rod motor assembly used for driving the two positioning assemblies, and a sensor used for sensing the PCB.

Furthermore, the positioning devices are arranged in two numbers, one positioning device is positioned on one side, close to the input end of the conveying device, of the first silk-screen mechanism, and the other positioning device is positioned between the turnover device and the second silk-screen mechanism.

Compared with the prior art, the method has the following beneficial effects:

in the utility model, because the two silk-screen printing mechanisms are arranged and the drying mechanism is arranged behind the silk-screen printing mechanisms, the printing ink in each silk-screen printing procedure is completely dried, the phenomenon of ink transfer in the transportation process is reduced, the rejection rate and the rework rate are reduced, the operation time is reduced, and the production benefit is improved.

In addition, the turnover device and the positioning device are arranged, so that the PCB is corrected for displacement after being turned over, the screen printing precision and the automation degree are improved, the rejection rate and the rework rate are further reduced, and the production efficiency is improved.

Drawings

Fig. 1 is a schematic structural view of the present invention, in which a lifting support assembly and a turnover device on the right side of the angle transfer device along the transfer direction are hidden.

Fig. 2 is a schematic structural diagram of the hidden transmission device in fig. 1.

Fig. 3 is a schematic structural diagram of a first turning link mechanism and a second turning link mechanism of the present invention, the turning device is located at the left side of the conveying device along the conveying direction.

Fig. 4 is a schematic structural view of the opposite side of fig. 3.

Fig. 5 is a schematic structural view of the first and second flip stoppers of the present invention in a state of flipping the PCB.

Fig. 6 is a plan view of the turning device of the present invention positioned on the left side of the conveying device in the conveying direction.

Fig. 7 is a schematic structural view of the elevating support assembly of the present invention.

Fig. 8 is a side view of the positioning device of the present invention.

The figure includes: the device comprises a machine table 1, a conveying device 2, a first silk-screen printing mechanism 3, a silk-screen printing component 31, a lifting support component 32, a lifting support plate 321, a lifting driving component 322, a blocking part 315, a second silk-screen printing mechanism 4, a first drying mechanism 5, an air outlet component 51, a connecting pipe 52, an air heater 53, a second drying mechanism 6, a turnover device 7, a first turnover connecting rod mechanism 71, a first mounting vertical plate 711, a first turnover blocking part 712, a first resisting part 7121, a first electric lead screw 713, a first pin 714, a first driving rod 715, a second turnover connecting rod mechanism 72, a second mounting vertical plate 721, a second turnover blocking part 722, a second resisting part 7221, a second electric lead screw 723, a second pin 724, a second driving rod 725, a positioning device 8, a positioning component 81, a bidirectional lead screw component 82 and a sensor 83.

Detailed Description

To facilitate an understanding of the present invention for those skilled in the art, the present invention will be described in further detail below with reference to specific embodiments and accompanying drawings.

As shown in fig. 1 and 2, an automatic turnover screen printing machine includes a machine table 1 and a conveying device 2 disposed on the machine table 1, wherein the width of the conveying device 2 is smaller than the width of a PCB. The machine table 1 is sequentially provided with a first silk-screen printing mechanism 3, a first drying mechanism 5, a turnover device 7, a second silk-screen printing mechanism 4 and a second drying mechanism 6 along the conveying direction of the conveying device 2, and the turnover devices 7 are arranged at two sides of the conveying device 2 and are symmetrically arranged along the conveying direction perpendicular to the conveying direction. Fig. 1 conceals the turning device 7 on the right side of the conveying device 2 in the conveying direction. First silk screen printing mechanism 3 and second silk screen printing mechanism 4 are the same structure, all including setting up in the silk screen printing subassembly 31 of conveyer 2 top, the symmetry sets up in the lift supporting component 32 of conveyer 2 both sides, wherein fig. 1 has hidden conveyer 2 along the lift supporting component 32 on the right side of direction of transfer, and lift supporting component 32 is located silk screen printing subassembly 31 below, and lift supporting component 32 is provided with the card fender portion 315 that is used for blocking the PCB board. The machine table 1 is also provided with a positioning device 8. The first drying mechanism 5 and the second drying mechanism 6 are also the same in structure. In this embodiment, the transmission device 2 employs a transmission belt and a transmission roller, which are the prior art and will not be described in detail.

Because the width of the conveying device 2 is smaller than that of the PCB, the two sides of the PCB are provided with suspended parts, and the lifting support component 32 is contacted with the suspended parts at the two sides of the PCB so as to ensure that the PCB can move up and down. When the PCB passes through the 3 below of first silk-screen printing mechanism of conveyer 2, the card fender portion 315 blocks the PCB and keeps off, and then lift supporting component 32 makes the PCB rise, and with the separation of conveyer 2, first silk-screen printing mechanism 3 carries out printing ink coating to the first face of PCB, and lift supporting component 32 descends and makes the PCB reset to conveyer 2 on. The PCB board carries out first face stoving process through first stoving mechanism 5, then overturns through turning device 7, then carries out the displacement through positioner 8 and revises, then carries out the printing ink coating and the stoving process of second face through second silk-screen printing mechanism 4, second stoving mechanism 6.

Because the two silk-screen printing mechanisms and the two drying mechanisms are arranged, the printing ink of each silk-screen printing procedure is completely dried, the phenomenon of ink transfer in the transportation process is reduced, the rejection rate and the rework rate are reduced, the operation time is reduced, and the production benefit is improved.

In addition, because automatic upset silk screen printing machine still is provided with turning device 7 and positioner 8, makes the PCB board still keep accurate displacement after the upset, has improved silk screen printing precision and degree of automation, has further reduced disability rate and rework rate, has improved production efficiency. Specifically, one of the turning devices 7 is arranged at the rear side of the angle shown in fig. 1, and the other is arranged at the front side, and the turning device 7 at the front side is hidden in fig. 1 and 2 to avoid causing shielding. The two turnover devices 7 are in contact with the suspended part of the PCB to turn the PCB over, and then the PCB returns to the conveying device 2.

As shown in fig. 1, each of the two turnover devices 7 includes a first turnover link mechanism 71 for turning over the PCB and a second turnover link mechanism 72 for receiving the PCB, which are sequentially arranged in the conveying direction. As shown in fig. 3 to 6, in the direction perpendicular to the conveying direction, both the first flipping links 71 are located on the side of the two second flipping links 72 away from the conveyor 2.

As shown in fig. 3 to 4, the first turning link mechanism 71 includes a first mounting vertical plate 711 vertically disposed on the machine base 1, a first turning stopper 712 disposed on the first mounting vertical plate 711, and a first electric screw 713 disposed along the horizontal direction. The first end of the first turnover stopper 712 is rotatably connected to the first mounting vertical plate 711 via a first pin 714, the second end thereof is movably connected to the movable end of the first electric screw 713 via a first driving rod 715, and the first driving rod 715 is rotatably connected to the movable end of the first electric screw 713. The second turning link mechanism 72 includes a second mounting vertical plate 721 vertically disposed on the machine platform 1, a second turning stopper 722 disposed on the second mounting vertical plate 721, and a second electric screw 723 disposed along the horizontal direction. The first end of the second turnover stopper 722 is rotatably connected to the second mounting vertical plate 721 through a second pin 724, the second end is movably connected to the movable end of the second electric screw 723 through a second driving rod 725, and the second driving rod 725 is rotatably connected to the movable end of the second electric screw 723. Fig. 6 is a top view of the turning device 7 on the rear side of the angle shown in fig. 1. As shown in fig. 4, 5 and 6, the first turning stopper 712 and the second turning stopper 722 are the same structure, both of which are substantially L-shaped, and are disposed in a staggered manner, and when the first turning stopper 712 and the second turning stopper 722 are turned over, no contact occurs.

The suspending portion of the PCB is in contact with the first turning stopper 712 and is blocked, then the first turning stopper 712 drives the PCB to turn, the first turning stopper 712 meets the second turning stopper 722, the PCB is transferred from the second turning stopper 722 to the second turning stopper 722, and then the second turning stopper 722 is reset, so that the PCB is placed on the conveyor 2.

Due to the arrangement of the first overturning connecting rod mechanism 71 for overturning the PCB and the second overturning connecting rod mechanism 72 for carrying the PCB, the PCB can be overturned stably, so that the automation degree is improved, and the production efficiency is improved.

As shown in fig. 5, in order to easily transfer the PCB from the first turn stopper 712 to the second turn stopper 722, in practice, the maximum turning angle of the second turn stopper 722 is set to be less than 90 °, and the maximum turning angle of the second turn stopper 722 is complementary to the maximum turning angle of the first turn stopper 712. By adopting the inclination angle, the PCB can be easily turned over.

As shown in fig. 5, the PCB is in hard contact with the first turning stopper 712 and the second turning stopper 722 during the transferring process, in order to protect the surface of the PCB, a first abutting portion 7121 is disposed at a first end of the first turning stopper 712, and a second abutting portion 7221 is disposed at a first end of the second turning stopper 722. By adopting the structure, the contact area between the PCB and the first overturning blocking part 712 and the second overturning blocking part 722 can be reduced, thereby reducing the conditions of ink transfer and surface scratching of the PCB, and further reducing the rejection rate and the rework rate.

As shown in fig. 1 and 7, the lifting support assembly 32 includes a lifting support plate 321 disposed on the machine platform 1, and a lifting driving member 322 for driving the lifting support plate 321, and the blocking portion 315 is disposed on a side of the lifting support plate 321 close to an output end of the conveying direction. Specifically, one of the lift support assemblies 32 is disposed at the rear side of the angle shown in fig. 1, and the other is disposed at the front side, and the lift support assembly 32 at the front side is hidden in fig. 1 and 2 to avoid obstruction.

As shown in fig. 1 and fig. 2, the first drying mechanism 5 and the second drying mechanism 6 both include an air outlet assembly 51 disposed above the conveyor 2 and an air heater 53 disposed on the machine platform 1. The air outlet assembly 51 and the hot air blower 53 are connected by a connecting pipe 52. The air outlet assembly 51 is provided with an air outlet slot, and the direction of the air outlet slot is perpendicular to the conveying direction of the conveying mechanism. Because the air outlet assembly 51 adopts the air outlet groove structure, the air outlet of the air outlet groove can ensure that the PCB on the conveying mechanism is covered, so that the printing ink is completely dried, and the production efficiency is improved.

In the present embodiment, two positioning devices 8 are provided. As shown in fig. 1 and 8, one positioning device 8 is located on the side of the first screen printing mechanism 3 close to the input end of the conveying device 2, and the other positioning device 8 is located between the turnover device 7 and the second screen printing mechanism 4. In specific implementation, the number and positions of the positioning devices 8 can be adjusted according to actual requirements, and the positioning devices include two positioning assemblies 81 symmetrically arranged above the conveying device 2, a bidirectional screw motor assembly 82 used for driving the two positioning assemblies 81, and a sensor 83 used for sensing a PCB. The bidirectional screw motor assembly 82 is arranged below the conveying device 2, and the two positioning assemblies 81 are connected with the two movable ends of the bidirectional screw motor assembly 82. When the PCB passes through the positioning device 8, the sensor 83 outputs signals, the conveying device 2 stops running, the bidirectional screw rod motor assembly 82 drives the two positioning assemblies 81 to clamp, position and correct displacement of the two sides of the PCB, the automation degree and the silk-screen printing process precision are improved, the rejection rate and the rework rate are further reduced, and the production efficiency is improved.

In the description of the present invention, it is to be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings and are only for convenience in describing the present invention and simplifying the description, but are not intended to indicate or imply that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, e.g., as meaning permanently attached, removably attached, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

While the utility model has been described in conjunction with the specific embodiments set forth above, it is evident that many alternatives, modifications, and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications, and variations that fall within the scope of the included claims.

Claims

1. An automatic overturning screen printing machine is characterized by comprising a machine table (1) and a conveying device (2) arranged on the machine table (1), wherein a first screen printing mechanism (3), a first drying mechanism (5), an overturning device (7), a second screen printing mechanism (4) and a second drying mechanism (6) are sequentially arranged on the machine table (1) along the conveying direction of the conveying device (2); two turnover devices (7) are arranged and are symmetrically arranged at two sides of the conveying device (2) along the direction vertical to the conveying direction; the first silk-screen printing mechanism (3) and the second silk-screen printing mechanism (4) respectively comprise a silk-screen component (31) arranged above the conveying device (2) and lifting support components (32) symmetrically arranged on two sides of the conveying device (2), the lifting support components (32) are positioned below the silk-screen component (31), and the lifting support components (32) are provided with blocking parts (315); the machine table (1) is also provided with a positioning device (8).

2. The automatic turnover screen printing machine of claim 1, wherein two turnover devices (7) each comprise a first turnover linkage (71) for turning over the PCB and a second turnover linkage (72) for receiving the PCB, which are arranged in sequence along the conveying direction.

3. The automatic turnover screen printing machine of claim 2, wherein the first turnover linkage mechanism (71) comprises a first mounting vertical plate (711) vertically arranged on the machine table (1), a first turnover stopper (712) arranged on the first mounting vertical plate (711), and a first electric lead screw (713) arranged along the horizontal direction; the first end of the first overturning blocking piece (712) is rotatably connected with the first mounting vertical plate (711) through a first pin shaft (714), and the second end of the first overturning blocking piece is movably connected with the movable end of the first electric screw rod (713) through a first driving rod (715); the second turnover connecting rod mechanism (72) comprises a second mounting vertical plate (721) vertically arranged on the machine table (1), a second turnover stopper (722) arranged on the second mounting vertical plate (721), and a second electric lead screw (723) arranged along the horizontal direction; the first end of the second overturning blocking piece (722) is rotatably connected with the second mounting vertical plate (721) through a second pin shaft (724), and the second end of the second overturning blocking piece is movably connected with the movable end of a second electric screw rod (723) through a second driving rod (725).

4. The automatic turn-over screen printing machine according to claim 3, characterized in that the maximum turn-over angle of the second turn-over stopper (722) is less than 90 °, the maximum turn-over angle of the second turn-over stopper (722) and the maximum turn-over angle of the first turn-over stopper (712) being in a complementary relationship.

5. The automatic turnover screen printing machine of claim 4, wherein the first turnover stopper (712) is provided with a first resisting portion (7121) at a first end, and the second turnover stopper (722) is provided with a second resisting portion (7221) at a first end.

6. The automatic turnover screen printing machine of claim 1, wherein the lifting support assembly (32) comprises a lifting support plate (321) arranged on the machine table (1), and a lifting driving member (322) for driving the lifting support plate (321), and the blocking portion (315) is arranged on one side of the lifting support plate (321) close to the output end of the conveying direction.

7. The automatic turnover screen printing machine according to claim 1, wherein the first drying mechanism (5) and the second drying mechanism (6) each comprise an air outlet assembly (51) arranged above the conveyor (2) and a hot air blower (53) arranged on the machine table (1); the air outlet assembly (51) is connected with the hot air blower (53) through a connecting pipe (52).

8. The automatic turnover screen printing machine of claim 7, wherein the air outlet assembly (51) is provided with an air outlet groove, and the direction of the air outlet groove is perpendicular to the conveying direction of the conveying mechanism.

9. The automatic turnover screen printing machine of claim 1, wherein the positioning device (8) comprises two positioning assemblies (81) symmetrically arranged at two sides of the conveying device (2), a bidirectional screw rod motor assembly (82) for driving the two positioning assemblies (81), and a sensor (83) for sensing a PCB.

10. The automatic overturning screen printing machine according to claim 1, characterized in that there are two positioning devices (8), one (8) being located on the side of said first screen printing mechanism (3) close to the input end of the conveyor (2), the other (8) being located between said overturning device (7) and the second screen printing mechanism (4).