A circuit board printing jig

Abstract

The present invention discloses a circuit board printing jig, which relates to the field related to circuit board printing, and is intended to solve the problem that the negative pressure adsorption method of a frameless PCB board in the prior art has certain disadvantages, the adsorption force is uneven, and there is a difference between the adsorption position and the standard position. A jig sealing plate is arranged at the lower end in the middle of the jig bottom plate, a jig enclosure is arranged between the jig sealing plate and the jig bottom plate, a main air duct is installed in the middle of the lower end of the jig sealing plate, a first air outlet is arranged in the middle of the upper end surface of the jig sealing plate, a second air outlet is arranged on the outside of the first air outlet, and the second air outlet is arranged in multiple groups, a third air outlet is arranged on the outside of the second air outlet, and the diameters of the first air outlet, the multiple groups of second air outlets and the third air outlet are increased in sequence, the first air outlet, the second air outlet and the third air outlet are all connected to the main air duct, and an air guide channel is formed between the first air outlet, the second air outlet and the third air outlet and the main air duct, and the air guide channel is arranged inside the jig sealing plate.

Description

Technical Field

[0001] The invention relates to the field related to circuit board printing, and in particular to a circuit board printing jig. Background Art

[0002] The jig is mainly used as a tool to assist in controlling position or movement (or both). A printing jig usually refers to a tool used to carry and fix the PCB during the printing process. The printing jig needs to have a certain stability during printing to ensure that there is no deviation during the printing process. The printing jig must ensure uniform heat distribution on the PCB while maintaining support stability. The existing printing jigs that provide support for the PCB basically support the area on the PCB where no components are set.

[0003] However, the way the printing jig fixes the PCB board is still relatively simple, including the fixation of the PCB frame. However, most of the PCB boards are currently in the stage of refined manufacturing and are generally frameless. This type of PCB is generally fixed by negative pressure adsorption, but negative pressure adsorption has certain disadvantages. The adsorption force is strong near the air outlet and weak far from the air outlet. The uneven adsorption effect may affect the fixation of the jig to the PCB board, and the influence of the adsorption position on the printing effect is ignored. Therefore, the market urgently needs to develop a circuit board printing jig to help people solve the existing problems. Summary of the invention

[0004] The purpose of the present invention is to provide a circuit board printing jig to solve the problem that the negative pressure adsorption method of the frameless PCB board proposed in the above background technology has certain disadvantages, the adsorption force is uneven, and there is a difference between the adsorption position and the standard position.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a circuit board printing jig, comprising a jig bottom plate, a jig sealing plate is arranged at the lower end in the middle of the jig bottom plate, a jig enclosure is arranged between the jig sealing plate and the jig bottom plate, and the jig bottom plate, the jig enclosure and the jig sealing plate are integrally formed, a main air duct is installed in the middle of the lower end of the jig sealing plate, a first air outlet is arranged in the middle of the upper end surface of the jig sealing plate, a second air outlet is arranged on the outer side of the first air outlet, and the second air outlet is arranged There are multiple groups, a third air outlet is arranged on the outer side of the second air outlet, and the diameters of the first air outlet, the multiple groups of second air outlets and the third air outlet are increased successively, the first air outlet, the second air outlet and the third air outlet are all connected to the main air duct, an air guide channel is formed between the first air outlet, the second air outlet and the third air outlet and the main air duct, the air guide channel is arranged inside the jig sealing plate, a negative pressure cavity is formed between the jig sealing plate and the jig surrounding plate, a jig top plate is arranged on the upper end of the jig bottom plate, and the jig top plate is fitted with the jig bottom plate.

[0006] Preferably, a placement cavity is provided in the middle of the upper end of the jig top plate, and the size of the placement cavity is equal to the size of the negative pressure cavity, the placement cavity is recessed in the jig top plate, and a negative pressure adsorption port is provided on the lower end surface of the placement cavity, and there are several negative pressure adsorption ports, the negative pressure adsorption ports penetrate the jig top plate, and the negative pressure adsorption ports are connected to the negative pressure cavity.

[0007] Preferably, movable guide rails are arranged on the outer sides of the four right-angle positions of the placement cavity, and the movable guide rails are arranged obliquely. The movable guide rails pass through the top plate of the fixture, and a clamping member is installed inside the movable guide rails.

[0008] Preferably, the clamping member includes a clamping plate, and the clamping plate is located at the upper end of the movable guide rail, the width of the clamping plate is greater than the width of the movable guide rail, the clamping plate includes a preset notch, and the preset notch is set in a rectangular step shape, a movable screw is provided at the lower end of the clamping plate, and the movable screw is fixed to the clamping plate, the length of the movable screw is greater than the height of the fixture top plate, the width of the movable screw is less than the width of the movable guide rail, a locking nut is provided on the outer side of the movable screw, and the locking nut is connected to the movable screw by a thread, and the width of the locking nut is greater than the width of the movable guide rail.

[0009] Preferably, a sealing ring is provided on the outer side of the upper end surface of the negative pressure chamber, and the sealing ring is arranged in a rectangular shape, and a groove is provided on the lower end surface of the top plate of the fixture, and the groove matches the sealing ring.

[0010] Preferably, a jig base plate fixing hole is provided in the middle of the four sides of the upper end surface of the jig base plate, and a fixing screw is provided inside the jig base plate fixing hole. The fixing screw includes a screw head, and after the fixing screw is connected to the jig base plate fixing hole by threading, the screw head is embedded in the jig base plate fixing hole.

[0011] Preferably, a hexagonal embedding hole is provided on the outer side of the upper end of the negative pressure chamber, a circular embedding hole is provided on the lower end of the hexagonal embedding hole, the movable screw is embedded in the circular embedding hole, and the locking nut is embedded in the hexagonal embedding hole.

[0012] Preferably, the four corners of the jig top plate are all provided with jig top plate connecting holes, the four corners of the jig bottom plate are all provided with jig bottom plate connecting holes, and the jig top plate and the jig bottom plate are connected by connecting bolts.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. In the invention, the PCB board is directly adsorbed by a non-traditional negative pressure adsorption port, but a main air duct is arranged under the fixture sealing plate, and the first air vent, the second air vent and the third air vent are arranged on the fixture sealing plate. The first air vent, the second air vent and the third air vent are respectively connected to the main air duct inside the fixture sealing plate to form an adsorption channel. Since the diameters of the first air vent, the second air vent and the third air vent are different, the diameters of the adsorption channels are different, and the diameters of the adsorption channels increase from the inside to the outside, and a negative pressure cavity and a plurality of negative pressure adsorption ports are arranged. During adsorption, the pipeline of the adsorption device is connected to the main air duct. Since the first air vent is close to the main air duct position, but its diameter is the smallest, and the third air vent is far away from the main air duct position, but its diameter is the largest, the air volume adsorbed by the first air vent, the second air vent and the third air vent is roughly equal according to the corresponding changes in the length and diameter of the channel, so the adsorption effect of each negative pressure adsorption port on the PCB board is more uniform, so that the stability of the placement of the PCB board is better;

[0015] 2. In the invention, movable clamping parts are arranged outside the four right angles of the placement cavity. When printing is required, the clamping parts are moved on the movable guide rail. Since the clamping parts are just the size of the PCB board when they are moved to one end of the movable guide rail, the position of the PCB board can be kept at the standard position. Then, the PCB board is fixed by the negative pressure adsorption method of the adsorption device. When printing is finally performed, there is no difference between the position of the PCB board and the printing position in the vertical direction, and they just correspond. Moreover, the PCB board is very stable during printing, which can avoid the scrapping of the entire PCB board caused by printing errors, thereby reducing the defective rate of the product.

[0016] 3. In the invention, a sealing ring is provided on the outside of the negative pressure chamber, and a sealing ring is provided when the jig top plate is connected to the jig bottom plate, so that after the jig top plate and the jig bottom plate are connected, there is no extra gap except for the negative pressure adsorption port at the upper end and the first air outlet, the second air outlet and the third air outlet at the lower end. When adsorption is performed during the printing process, the pressure of the negative pressure chamber is ensured to be constant, thereby ensuring the stable adsorption effect of the PCB board;

[0017] 4. In the present invention, a fixture bottom plate fixing hole and a hexagonal embedding hole are provided, so that when the fixture top plate and the fixture bottom plate are connected, the fixing screws and the locking nuts can be embedded in the positions, so that there is no connection component between the fixture top plate and the fixture bottom plate to affect the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of a circuit board printing jig of the present invention;

[0019] Figure 2 It is the overall structural diagram of the fixture bottom plate of the present invention;

[0020] Figure 3 A top view of the bottom plate of the jig of the present invention;

[0021] Figure 4 It is the overall structural diagram of the top plate of the jig of the present invention;

[0022] Figure 5 A top view of the top plate of the jig of the present invention;

[0023] Figure 6 It is the overall structural diagram of the clamping member of the present invention.

[0024] In the figure: 1. jig top plate; 2. jig bottom plate; 3. jig enclosure; 4. connecting bolts; 5. fixing screws; 6. main air duct; 7. jig bottom plate connecting hole; 8. jig bottom plate fixing hole; 9. hexagonal embedding hole; 10. jig sealing plate; 11. negative pressure chamber; 12. sealing ring; 13. first air outlet; 14. second air outlet; 15. third air outlet; 16. jig top plate connecting hole; 17. moving guide rail; 18. placement chamber; 19. negative pressure adsorption port; 20. clamping piece; 21. clamping plate; 22. preset notch; 23. moving screw; 24. locking nut. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] See also Figure 1-6, an embodiment of the present invention: a circuit board printing jig, including a jig base plate 2, a jig sealing plate 10 is arranged at the lower end in the middle of the jig base plate 2, a jig enclosure 3 is arranged between the jig sealing plate 10 and the jig base plate 2, the jig enclosure 3 is located in a position where the printing equipment should be embedded in the platform of the printing device when installing to improve the stability during installation, and the jig base plate 2, the jig enclosure 3 and the jig sealing plate 10 are integrally formed, a main air duct 6 is installed in the middle of the lower end of the jig sealing plate 10, a first air outlet 13 is arranged in the middle of the upper end surface of the jig sealing plate 10, a second air outlet 14 is arranged on the outer side of the first air outlet 13, and the second air outlet 14 is arranged in multiple groups, the second air outlet 14 represents multiple groups of air outlets, and the specific number is not limited, the outer side of the second air outlet 14 is arranged with a third air outlet 15, and the diameters of the first air outlet 13, the multiple groups of second air outlets 14 and the third air outlet 15 increase in sequence. In addition, each air outlet on the first air outlet 13, the second air outlet 14 and the third air outlet 15 is a circular array, with four air outlets on each layer, and the air outlets on two adjacent layers are rotated 90 degrees and staggered to make the adsorption force at each position in the negative pressure chamber 11 basically equal, so as to avoid excessive adsorption force in the middle, and the wind flow will have eddy currents, which will cause the placed PCB board to rotate slightly and move away from the original position. Even if the eddy current effect is small and the adsorption is uneven, it may also damage or scratch the outer surface of the PCB board. The first air outlet 13, the second air outlet 14 and the third air outlet 15 are all connected to the main air duct 6, and an air guide channel is formed between the first air outlet 13, the second air outlet 14 and the third air outlet 15 and the main air duct 6. The air guide channel is arranged inside the jig sealing plate 10, and a negative pressure chamber 11 is formed between the jig sealing plate 10 and the jig enclosure 3. A jig top plate 1 is arranged on the upper end of the jig bottom plate 2, and the jig top plate 1 is fitted with the jig bottom plate 2.

[0027] Under the same volume flow rate, the cross-sectional area is inversely proportional to the flow rate, but gas is different from liquid. Gas also has compression volume loss, so the length of the air guide channel between the third air outlet 15 far away from the main air duct 6 and the main air duct 6 is longer. However, in actual situations, there are many factors that affect it, and it is not a theoretical value in a standard environment. Therefore, the wind flow rates of the first air outlet 13, the second air outlet 14 and the third air outlet 15 cannot be absolutely equal. We can only ensure that the values ​​are roughly equal as much as possible, and the difference between the values ​​is not large.

[0028] Furthermore, a placement cavity 18 is provided in the middle of the upper end of the jig top plate 1. The size of the placement cavity 18 is slightly larger than the size of the PCB board. Therefore, the outer side of the lower end surface of the placement cavity 18 is not provided with a negative pressure adsorption port 19, and the size of the placement cavity 18 is equal to the size of the negative pressure cavity 11. The placement cavity 18 is recessed in the jig top plate 1. The lower end surface of the placement cavity 18 is provided with a negative pressure adsorption port 19, and there are several negative pressure adsorption ports 19. The size of the plane formed by the several negative pressure adsorption ports 19 is slightly smaller than the size of the PCB board, so as to avoid air suction from the negative pressure adsorption port 19 not covered by the PCB board, thereby weakening the adsorption effect on the PCB board. The negative pressure adsorption port 19 passes through the jig top plate 1, and the negative pressure adsorption port 19 is connected to the negative pressure cavity 11.

[0029] Furthermore, movable guide rails 17 are arranged outside the four right-angle positions of the placement cavity 18 , and the movable guide rails 17 are arranged obliquely. The movable guide rails 17 penetrate the fixture top plate 1 , and a clamping member 20 is installed inside the movable guide rails 17 .

[0030] Furthermore, the clamping member 20 includes a clamping plate 21, and the clamping plate 21 is located at the upper end of the movable guide rail 17, the width of the clamping plate 21 is greater than the width of the movable guide rail 17, the clamping plate 21 includes a preset notch 22, and the preset notch 22 is set to a rectangular step shape, a movable screw 23 is provided at the lower end of the clamping plate 21, and the movable screw 23 is fixed to the clamping plate 21, the length of the movable screw 23 is greater than the height of the fixture top plate 1, the width of the movable screw 23 is less than the width of the movable guide rail 17, a locking nut 24 is provided on the outer side of the movable screw 23, and the locking nut 24 is connected to the movable screw 23 by a thread, and the width of the locking nut 24 is greater than the width of the movable guide rail 17.

[0031] Furthermore, a sealing ring 12 is provided on the outer side of the upper end surface of the negative pressure chamber 11 , and the sealing ring 12 is configured to be rectangular. A groove is provided on the lower end surface of the fixture top plate 1 , and the groove matches the sealing ring 12 .

[0032] Furthermore, a jig base plate fixing hole 8 is provided in the middle of the four sides of the upper end surface of the jig base plate 2, and a fixing screw 5 is provided inside the jig base plate fixing hole 8. The fixing screw 5 includes a screw head, and after the fixing screw 5 is connected to the jig base plate fixing hole 8 by threaded connection, the screw head is embedded in the jig base plate fixing hole 8.

[0033] Furthermore, a hexagonal embedding hole 9 is provided on the outer side of the upper end of the negative pressure chamber 11 , a circular embedding hole is provided at the lower end of the hexagonal embedding hole 9 , and the moving screw 23 is embedded in the circular embedding hole, and the locking nut 24 is embedded in the hexagonal embedding hole 9 .

[0034] Furthermore, the four corners of the jig top plate 1 are each provided with jig top plate connection holes 16 , the four corners of the jig bottom plate 2 are each provided with jig bottom plate connection holes 7 , and the jig top plate 1 and the jig bottom plate 2 are connected by connecting bolts 4 .

[0035] Working principle: When in use, first fix the jig bottom plate 2 to the printing device by fixing screws 5, and connect the main air duct 6 to the upper air duct of the adsorption device. Place the PCB board to be printed in the placement cavity 18 according to the positive and negative positions, and push the clamps 20 set at the four corner positions. When the clamps 20 move to the innermost position on the movable guide rail 17, the four clamps 20 just fit the four corners of the PCB board, and the lower end surface of the upper edge of the clamping plate 21 at the preset notch 22 position just fits a corner of the upper end surface of the PCB board. At this time, the position of the PCB board is just the standard position for printing. Tighten the locking nut 24 to fix the clamp 20. Fix the jig top plate 1 and the jig bottom plate 2 by connecting bolts 4. At this time, the sealing ring 12 set on the jig bottom plate 2 is just embedded in the preset groove on the lower end surface of the jig top plate 1, and the moving screw 23 and the locking nut 24 on the clamp 20 are just embedded in the hexagonal embedding hole 9 and the circular embedding hole for sealing. After the PCB board is installed, the adsorption device is started. The adsorption device adsorbs air through the main air duct 6, the first air outlet 13, the second air outlet 14, the third air outlet 15, the negative pressure chamber 11 and the negative pressure adsorption port 19, so that the lower edge of the PCB board is tightly attached to the negative pressure adsorption port 19, thereby fixing it. During the adsorption process of the adsorption device, because the diameters of the first air outlet 13, the second air outlet 14 and the third air outlet 15 are different, and the diameters of the air guide channel formed by the first air outlet 13, the second air outlet 14 and the third air outlet 15 and the main air duct 6 are also different, but the first air outlet 13 is closest to the main air duct 6 and has the strongest adsorption force, the third air outlet 15 is farthest from the main air duct 6 and has the weakest adsorption force, and the diameter of the first air outlet 13 is smaller than the diameter of the third air outlet 15, so the air suction volume of the first air outlet 13, the second air outlet 14 and the third air outlet 15 is basically equal, so that the adsorption force on the same horizontal plane in the negative pressure chamber 11 is basically equal, so that the PCB board is fixed due to the uniform adsorption effect, and then the printing device is used for printing. After a single PCB board is printed, the adsorption device is closed, the locking nut 24 is loosened, and the clamping member 20 can be movable, so that the clamping member 20 moves outward along the movable guide rail 17, the printed PCB board is taken out, and the next PCB board is placed on it, and it is moved to the standard position by the clamping member 20, fixed by the adsorption device, and printed by the printing device.

[0036] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A circuit board printing jig, comprising a jig base plate (2), characterized in that: A jig sealing plate (10) is arranged at the lower middle end of the jig bottom plate (2), a jig enclosure (3) is arranged between the jig sealing plate (10) and the jig bottom plate (2), and the jig bottom plate (2), the jig enclosure (3) and the jig sealing plate (10) are integrally formed, a main air duct (6) is installed in the middle of the lower end of the jig sealing plate (10), a first air outlet (13) is arranged in the middle of the upper end surface of the jig sealing plate (10), a second air outlet (14) is arranged on the outer side of the first air outlet (13), and the second air outlet (14) is arranged in multiple groups, a third air outlet (15) is arranged on the outer side of the second air outlet (14), and the diameters of the first air outlet (13), the multiple groups of second air outlets (14) and the third air outlet (15) are increased in sequence, ... second air outlet (13), the multiple groups of second air outlets (14) and the third air outlet (15) are increased in sequence, and the diameters of the second air outlet (13), the multiple groups of second air outlets (14) and the third air outlet (15) are increased in sequence The first air outlet (13), the second air outlet (14) and the third air outlet (15) are all connected to the main air duct (6); an air guide channel is formed between the first air outlet (13), the second air outlet (14) and the third air outlet (15) and the main air duct (6); the air guide channel is arranged inside the fixture cover plate (10); a negative pressure chamber (11) is formed between the fixture cover plate (10) and the fixture enclosure plate (3); a fixture top plate (1) is arranged at the upper end of the fixture bottom plate (2), and the fixture top plate (1) is fitted with the fixture bottom plate (2); a placement chamber (18) is arranged in the middle of the upper end of the fixture top plate (1), and the size of the placement chamber (18) is equal to the size of the negative pressure chamber (11); the placement chamber (18) is recessed in the fixture top plate (1); the outer sides of the placement chamber (18) at four right angles are A movable guide rail (17) is provided, and the movable guide rail (17) is arranged obliquely, and the movable guide rail (17) passes through the fixture top plate (1), and a clamping member (20) is installed inside the movable guide rail (17), and the clamping member (20) includes a clamping plate (21), and the clamping plate (21) is located at the upper end of the movable guide rail (17), the width of the clamping plate (21) is greater than the width of the movable guide rail (17), the clamping plate (21) includes a preset notch (22), and the preset notch (22) is arranged in a rectangular step shape, and a movable screw rod (23) is provided at the lower end of the clamping plate (21), and the movable screw rod (23) is fixed to the clamping plate (21), the length of the movable screw rod (23) is greater than the height of the fixture top plate (1), and the width of the movable screw rod (23) is greater than the height of the fixture top plate (1). The movable screw (23) is provided with a locking nut (24) on the outer side, and the locking nut (24) is connected to the movable screw (23) by a thread, and the width of the locking nut (24) is greater than the width of the movable guide rail (17); the outer side of the upper end of the negative pressure chamber (11) is provided with a hexagonal embedding hole (9), the lower end of the hexagonal embedding hole (9) is provided with a circular embedding hole, and the movable screw (23) is embedded in the circular embedding hole, and the locking nut (24) is embedded in the hexagonal embedding hole (9); the outer side of the upper end surface of the negative pressure chamber (11) is provided with a sealing ring (12), and the sealing ring (12) is set in a rectangular shape, and the lower end surface of the fixture top plate (1) is provided with a groove, and the groove matches the sealing ring (12).

2. A circuit board printing jig according to claim 1, characterized in that: The lower end surface of the placement cavity (18) is provided with a negative pressure adsorption port (19), and a plurality of negative pressure adsorption ports (19) are provided. The negative pressure adsorption ports (19) penetrate the fixture top plate (1), and the negative pressure adsorption ports (19) are in communication with the negative pressure cavity (11).

3. A circuit board printing jig according to claim 1, characterized in that: A jig base fixing hole (8) is provided in the middle of each of the four sides of the upper end surface of the jig base plate (2), a fixing screw (5) is provided inside the jig base plate fixing hole (8), the fixing screw (5) comprises a screw head, and after the fixing screw (5) is connected to the jig base plate fixing hole (8) by threading, the screw head is embedded in the jig base plate fixing hole (8).

4. A circuit board printing jig according to claim 1, characterized in that: The jig top plate (1) is provided with jig top plate connection holes (16) at four corners, the jig bottom plate (2) is provided with jig bottom plate connection holes (7) at four corners, and the jig top plate (1) and the jig bottom plate (2) are connected via connection bolts (4).

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