Steel mesh for SMT (Surface Mount Technology) solder paste printing

Abstract

The utility model discloses a steel mesh for SMT printing solder paste, which comprises a solder paste printing machine, a sliding cross beam and a solder paste scraper, an adjusting rack is fixed at the top end of the solder paste printing machine, an adjusting piece slides at the top end of the adjusting rack, a lifting piece is fixed at the top end of the adjusting piece, a solder paste box is fixed at one end of the sliding cross beam, and the solder paste box is fixed at the other end of the sliding cross beam. A flow guide pipe is fixed to the bottom end of the solder paste box, a discharging pressing plate slides in the solder paste box, a lifting lead screw is fixed to the top end of the discharging pressing plate, and a driving part is rotationally arranged at the top end of the solder paste box. The discharging pressing plate is arranged in the solder paste material box and is driven by the lifting lead screw to move up and down, solder paste can be effectively extruded into the flow guide pipe, the discharging amount of the solder paste can be accurately controlled through the structure, the situation that too much or too little solder paste flows out is avoided, supply of the solder paste is more stable and even, and the printing quality and the printing effect are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of tin paste printing, specifically to a steel screen for SMT tin paste printing. BACKGROUND

[0002] Tin paste, gray paste, soldering tin paste is a new type of welding material along with SMT, is by soldering tin powder, flux and other surface active agent, thixotropic agent etc. are mixed, the paste mixture is formed, mainly used in SMT industry PCB surface resistance, capacitance, IC etc. electronic components welding, tin paste is removed through the hole of steel plate and contacts tin paste and is placed on the tin pad (PCB board pad) of the substrate.

[0003] At present, in the process of SMT (surface mounting technology) tin paste printing, firstly, in the storage of tin paste, the commonly used tin paste bin does not have good protection measures, and the tin paste is easy to dry, which not only shortens the effective use time of the tin paste, causes the waste of materials, but also leads to poor printing effect, secondly, in the supply of tin paste, the traditional blanking device is difficult to accurately control the discharging amount of tin paste, cannot guarantee the stable and uniform output of tin paste, so that the amount of tin paste supply is difficult to control, and too much or too little tin paste is prone to occur, too much tin paste will lead to short circuit and other problems after printing, and too little tin paste will cause virtual welding and other defects, which seriously affects the quality of SMT printing and the reliability of electronic products. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of steel screen for SMT tin paste printing to solve the problems raised in the above background.

[0005] To achieve the above object, the utility model provides the following technical scheme: a kind of steel screen for SMT tin paste printing, including tin paste printing machine, sliding crossbeam and tin paste scraper, the top of the tin paste printing machine is fixed with adjusting rack, the top of the adjusting rack is slid with adjusting piece, the top of the adjusting piece is fixed with lifting piece, one end of the sliding crossbeam is fixed with tin paste bin, the bottom of the tin paste bin is fixed with flow guide pipe, the inside of the tin paste bin is slid with blanking press plate, the top of the blanking press plate is fixed with lifting lead screw, the top of the tin paste bin is rotated with driving piece.

[0006] Preferably, one side of the tin paste bin is provided with inlet to be able to inject tin paste into the inside of the tin paste bin, the top of the inlet is rotated with bin cover plate to prevent tin paste in the inside of the tin paste bin from drying.

[0007] Preferably, one end of the flow guide pipe is obliquely arranged at the bottom of the tin paste bin, and the other end of the flow guide pipe is attached to the other side of the tin paste scraper.

[0008] Preferably, the adjusting member comprises a sliding groove, the top end of the adjusting rack is slidably provided with the sliding groove, a driving rotating rod is rotatably arranged in the sliding groove, a driven gear is fixed to the outer wall of the driving rotating rod, the driven gear is engaged with the top end of the adjusting rack, and a supporting rod is fixed to the top end of the sliding groove.

[0009] Preferably, the lifting member comprises a limiting plug rod, the top end of the supporting rod is formed with a cavity, the limiting plug rod is slidably arranged on one side of the cavity, a sliding block is slidably arranged in the cavity, a driving pull rod is fixed to the top end of the sliding block, and a limiting rack is fixed to one side of the driving pull rod.

[0010] Preferably, the limiting plug rod is in the shape of an "E" letter, springs are fixed to the inner side of the limiting plug rod and the outer wall of the supporting rod, and the limiting plug rod can be reset.

[0011] Preferably, the other end of the sliding block away from the limiting rack is provided with a limiting hole, and the sliding block can be limited by the limiting plug rod.

[0012] Preferably, the driving member comprises a driving turntable, the top end of the tin paste box is rotatably provided with the driving turntable, a linkage belt is wound around the outer wall of the driving turntable, a variable speed gear is wound around the other side of the inner wall of the linkage belt, and the bottom end of the variable speed gear is rotatably arranged at the top end of the tin paste box.

[0013] Preferably, a through hole is formed in the inside of the driving turntable, and a thread matched with the outer wall of the lifting screw is arranged in the through hole, so that the lifting screw can be driven to move up and down.

[0014] Compared with the prior art, the present application has the following beneficial effects:

[0015] 1. One side of the tin paste box is provided with a feeding port, which facilitates the injection of tin paste, and the box cover plate can prevent the tin paste from drying, thereby ensuring the storage environment of the tin paste, prolonging the use time of the tin paste, and avoiding waste and affecting the printing quality caused by the drying of the tin paste.

[0016] 2. The discharging pressing plate is arranged inside the tin paste box and can move up and down by the driving of the lifting screw, which can effectively extrude the tin paste into the flow guide pipe. This structure can accurately control the discharging amount of the tin paste, avoid too much or too little tin paste from flowing out, make the supply of the tin paste more stable and uniform, and help to improve the printing quality and printing effect.

[0017] 3. The driving turntable is matched with the lifting screw through the thread in the inside of the driving turntable. Rotating the driving turntable can drive the lifting screw to move up and down, realize the accurate driving of the discharging pressing plate, further ensure the controllability of the tin paste supply, and ensure that the tin paste can be stably output according to the set amount, thereby ensuring the consistency of the thickness of the tin paste in the printing process.

[0018] 4. The one end of the flow guide pipe is obliquely arranged at the bottom end of the tin paste tank, and the other end is attached to the other side of the tin paste scraping plate. This structure enables the tin paste to be smoothly transmitted from the tin paste tank to the tin paste scraping plate. The tin paste in the tin paste tank can be evenly and smoothly transmitted to the printing area under the action of pressure, reducing the possibility of blockage and uneven distribution of the tin paste during transmission and improving the efficiency of material transmission.

[0019] 5. The tin paste scraping plate can evenly scrape the tin paste flowing from the flow guide pipe on the circuit board, realizing high-quality tin paste printing. Combined with the accurate control of position adjustment and tin paste supply in the entire system, the appropriate and uniform tin paste can be finally ensured in each printing area, reducing printing defects such as short circuit caused by excessive tin paste and virtual welding caused by insufficient tin paste, significantly improving the quality and reliability of SMT printing, and improving the overall performance and reliability of electronic products.

[0020] 6. The linkage belt in the driving member connects the driving turntable and the speed change gear. The speed change gear can be driven by the limiting rack, thereby driving the linkage belt and the driving turntable to rotate, realizing the linkage between multiple components. This linkage mechanism improves the transmission efficiency and operation coordination of the entire system. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the utility model;

[0022] Figure 2 It is Figure 1 a side view of the connecting structure schematic diagram;

[0023] Figure 3 It is Figure 1 a top view of the connecting structure schematic diagram;

[0024] Figure 4 It is Figure 1 a side view of the connecting structure schematic diagram of the adjusting member and the lifting member in the utility model;

[0025] Figure 5 It is Figure 2 an enlarged connecting structure schematic diagram of A in the utility model;

[0026] Figure 6 It is Figure 2 an enlarged connecting structure schematic diagram of B in the utility model;

[0027] Figure 7 It is Figure 2 an enlarged connecting structure schematic diagram of C in the utility model.

[0028] In the figure: 1, tin paste printing machine, 2, sliding beam, 3, tin paste scraper, 4, adjusting rack, 5, sliding groove, 6, drive rotating rod, 7, driven gear, 8, supporting adjusting rod, 9, limiting plug rod, 10, sliding block, 11, drive pull rod, 12, limiting rack, 13, tin paste box, 14, flow guide pipe, 15, blanking press plate, 16, lifting screw, 17, drive rotary disc, 18, linkage belt, 19, speed change gear. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] Please refer to Figures 1-7 The present application provides a technical scheme: a steel mesh for SMT tin paste printing, comprising a tin paste printing machine 1, a sliding beam 2 and a tin paste scraper 3. The top end of the tin paste printing machine 1 is fixed with an adjusting rack 4. The adjusting rack 4 moves the sliding groove 5 left and right through the rotation of the top end teeth and the driven gear 7. The top end of the adjusting rack 4 slides with an adjusting piece. The top end of the adjusting piece is fixed with a lifting piece. One end of the sliding beam 2 is fixed with a tin paste box 13. The tin paste box 13 can store tin paste. The bottom end of the tin paste box 13 is fixed with a flow guide pipe 14. The tin paste inside the tin paste box 13 is extruded to the top end of the steel mesh through the flow guide pipe 14. The tin paste box 13 internally slides with a blanking press plate 15. The blanking press plate 15 can extrude the material into the flow guide pipe 14 through the drive of the lifting screw 16. The top end of the blanking press plate 15 is fixed with the lifting screw 16. The lifting screw 16 drives the blanking press plate 15 to move downward through the threads on the outer wall and the drive of the drive rotary disc 17. The top end of the tin paste box 13 rotates with a driving piece. One side of the tin paste box 13 is provided with a material inlet to inject tin paste into the inside of the tin paste box 13. The top end of the material inlet rotates with a box cover plate to prevent the tin paste inside the tin paste box 13 from drying. One end of the flow guide pipe 14 is obliquely arranged at the bottom end of the tin paste box 13. The other end of the flow guide pipe 14 is attached to the other side of the tin paste scraper 3.

[0031] The adjusting member comprises a sliding groove 5, the top end of the adjusting rack 4 is slidably provided with the sliding groove 5, the sliding groove 5 supports the driven gear 7 and drives the supporting rod 8 to move left and right, the driving rotating rod 6 is rotatably arranged in the sliding groove 5, the rotation of the driving rotating rod 6 drives the driven rack 7 to roll at the top end of the adjusting rack 4, thereby driving the sliding groove 5 to slide along the adjusting rack 4, the driven gear 7 is fixed to the outer wall of the driving rotating rod 6 and engages with the top end of the adjusting rack 4, the driven rack 7 drives the sliding groove 5 to move left and right through the driving of the driving rotating rod 6, the supporting rod 8 is fixed to the top end of the sliding groove 5, the supporting rod 8 supports the sliding block 10 and the limiting plug rod 9 and drives them to slide along the adjusting rack 4.

[0032] The lifting member comprises the limiting plug rod 9, the top end of the supporting rod 8 is formed with a cavity, the limiting plug rod 9 is slidably arranged on one side of the cavity, the limiting plug rod 9 is limited by the limiting hole arranged on one side of the sliding block 10, the sliding block 10 is slidably arranged in the cavity, the sliding block 10 drives the limiting rack 12 to move up and down through the driving of the driving pull rod 11, the driving pull rod 11 is fixed to the top end of the sliding block 10, the driving pull rod 11 drives the limiting rack 12 to move up and down through the sliding block 10, the limiting rack 12 is fixed to one side of the driving pull rod 11, the limiting rack 12 drives the speed change gear 19 through the teeth on one side, thereby driving the speed change gear 19, the limiting plug rod 9 is in the shape of an "E", springs are fixed to the inner side of the limiting plug rod 9 and the outer wall of the supporting rod 8, so as to reset the limiting plug rod 9, the other end of the sliding block 10 away from the limiting rack 12 is provided with a limiting hole, so as to limit the sliding block 10 through the limiting plug rod 9.

[0033] The driving member comprises the driving turntable 17, the top end of the tin paste box 13 is rotatably provided with the driving turntable 17, the driving turntable 17 drives the lifting lead screw 16 to move up and down through the thread matched with the outer wall of the lifting lead screw 16, the outer wall of the driving turntable 17 is wound with the linkage belt 18, the linkage belt 18 drives the driving turntable 17 to rotate through the driving of the speed change gear 19, the other side of the inner wall of the linkage belt 18 is wound with the speed change gear 19, and the bottom end of the speed change gear 19 is rotatably arranged at the top end of the tin paste box 13, the speed change gear 19 drives the linkage belt 18 to rotate through the driving of the limiting rack 12, the inside of the driving turntable 17 is provided with a through hole, the through hole is provided with a thread matched with the outer wall of the lifting lead screw 16, so as to drive the lifting lead screw 16 to move up and down.

[0034] The detailed connection means is a known technology in the art, and the working principle and process are mainly introduced below, and the specific work is as follows.

[0035] The cover plate at one end of the tin paste tank 13 is turned open, and then the tin paste is injected into the inside of the tin paste tank 13, the tin paste printing machine 1 is started, and when the tin paste tank 13 is moved to the left by the sliding beam 2, the variable speed gear 19 at the top end of the tin paste tank 13 is also moved to the left, the gear teeth arranged on one side of the limiting rack 12 drive the variable speed gear 19 to rotate, the variable speed gear 19 rotates to drive the driving turntable 17 through the linkage belt 18, the driving turntable 17 rotates to drive the lifting lead screw 16 to move downward through the threads arranged on the inner wall and the threads on the outer wall of the lifting lead screw 16, the lifting lead screw 16 drives the discharging pressure plate 15 to move downward to extrude the tin paste in the tin paste tank 13 into the inside of the flow guide pipe 14, and the tin paste is injected into one end of the tin paste scraping plate 3 through the flow guide pipe 14, when it is necessary to adjust the discharging speed, the driving turn rod 6 is rotated, the driven gear 7 is rotated, the driven gear 7 is rotated to drive the sliding groove 5 to slide along the adjusting rack 4 through the limiting of the adjusting rack 4 meshed at the bottom end, the sliding groove 5 drives the supporting rod 8 to slide, the supporting rod 8 drives the limiting rack 12 to move forward and backward through the sliding block 10, then the limiting rod 9 is pulled forward, the limiting rod 9 is moved forward to cancel the limiting of the sliding block 10, the driving pull rod 11 is pulled upward, the driving pull rod 11 is moved upward to drive the limiting rack 12 to move upward through the sliding block 10, the limiting rack 12 is meshed with one end of another variable speed gear 19 and moved upward, so that the lifting speed of the discharging pressure plate 15 is adjusted through the variable speed gears 19 with different diameters.

[0036] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A steel mesh for SMT printing of tin paste, comprising a tin paste printing machine (1), a sliding beam (2) and a tin paste squeegee (3), characterized in that, The top of the tin paste printing machine (1) is fixed with an adjusting rack (4), the top of the adjusting rack (4) is slidably provided with an adjusting member, the top of the adjusting member is fixed with a lifting member, one end of the sliding crossbeam (2) is fixed with a tin paste tank (13), the bottom of the tin paste tank (13) is fixed with a flow guide pipe (14), the inside of the tin paste tank (13) is slidably provided with a discharging pressing plate (15), the top of the discharging pressing plate (15) is fixed with a lifting lead screw (16), and the top of the tin paste tank (13) is rotatably provided with a driving member.

2. A steel mesh for SMT printing of solder paste according to claim 1, characterized in that The tin paste tank (13) is provided with a feeding port on one side, which can inject tin paste into the inside of the tin paste tank (13), and the top of the feeding port is rotatably provided with a tank cover plate for preventing the tin paste in the tin paste tank (13) from drying.

3. The steel mesh for printing solder paste according to claim 1, wherein One end of the flow guide pipe (14) is obliquely arranged at the bottom of the tin paste tank (13), and the other end of the flow guide pipe (14) is attached to the other side of the tin paste scraping plate (3).

4. The steel mesh for printing solder paste according to claim 1, wherein The adjusting member comprises a sliding groove (5), the top of the adjusting rack (4) is slidably provided with a sliding groove (5), the inside of the sliding groove (5) is rotatably provided with a driving rotating rod (6), the outer wall of the driving rotating rod (6) is fixed with a driven gear (7), and the driven gear (7) is engaged with the top of the adjusting rack (4), and the top of the sliding groove (5) is fixed with a supporting adjusting rod (8).

5. A steel mesh for SMT printing of solder paste according to claim 4, characterized in that The lifting member comprises a limiting plug rod (9), the top of the supporting adjusting rod (8) is formed with a cavity, one side of the cavity is slidably provided with a limiting plug rod (9), the cavity is slidably provided with a sliding block (10), the top of the sliding block (10) is fixed with a driving pull rod (11), and one side of the driving pull rod (11) is fixed with a limiting rack (12).

6. A steel mesh for SMT printing of solder paste according to claim 5, characterized in that The limiting plug rod (9) is in the shape of an "E" letter, and the inner side of the limiting plug rod (9) and the outer wall of the supporting adjusting rod (8) are fixed with a spring, which can reset the limiting plug rod (9).

7. The steel mesh for printing solder paste according to claim 5, wherein The other end of the sliding block (10) away from the limiting rack (12) is provided with a limiting hole, which can limit the sliding block (10) in cooperation with the limiting plug rod (9).

8. The steel mesh for printing solder paste according to claim 1, wherein The driving member comprises a driving turntable (17), the top of the tin paste tank (13) is rotatably provided with a driving turntable (17), the outer wall of the driving turntable (17) is wound with a linkage belt (18), the other side of the inner wall of the linkage belt (18) is wound with a speed change gear (19), and the bottom of the speed change gear (19) is rotatably arranged at the top of the tin paste tank (13).

9. The steel mesh for printing solder paste according to claim 8, wherein The inside of the driving turntable (17) is provided with a through hole, the through hole is provided with a thread matched with the outer wall of the lifting lead screw (16), which can drive the lifting lead screw (16) to move up and down.

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