Automatic cleaning device of solder paste printing machine

Abstract

The utility model relates to the technical field of SMT (Surface Mount Technology) production equipment, in particular to an automatic cleaning device of a solder paste printing machine, which can ensure the cleaning efficiency and prolong the service life of a steel mesh, has a reasonable structure and works reliably, and is characterized in that a roll paper winding and unwinding assembly releases or winds cleaning roll paper along the upper side of the steel mesh to be cleaned; the movable cleaning fluid spraying assembly sprays cleaning fluid along the upper portion of the roll paper. A cleaning fluid spraying assembly and a spraying driving mechanism are arranged in the movable cleaning fluid spraying assembly, and the cleaning fluid spraying assembly is driven by the spraying driving mechanism to do linear reciprocating motion.

Description

Technical field:

[0001] The utility model relates to the technical field of SMT production equipment, in particular to an automatic cleaning device for a solder paste printer which can ensure cleaning efficiency, increase the service life of a steel mesh, and has a reasonable structure and reliable operation. Background technology:

[0002] Solder paste printing is an important process in the SMT production line, which directly determines the quality of the SMT process. The solder paste printer is a key equipment for the surface mount technology (SMT) production line to produce and process printed circuit boards. During the solder paste printing process, the steel mesh is often contaminated due to the stickiness of the solder paste, resulting in the degradation of the performance of the solder paste printer, which gradually increases the number of PCB printing defects. Therefore, the steel mesh needs to be cleaned in time, and incorrect cleaning methods will not only lead to problems such as increased production costs, reduced service life of the steel mesh, and waste of cleaning materials, but also cause a large number of printing interruptions, affecting the production efficiency of the solder paste printer.

[0003] At present, the steel mesh cleaning device is provided with a vacuum cleaning suction chamber and a nozzle located below the steel mesh. When working, the alcohol in the alcohol barrel is pumped into the suction chamber, and then the alcohol is sprayed out through the nozzle arranged in the vacuum cleaning suction chamber to soak the roll paper wrapped on the suction chamber. The steel mesh to be cleaned is wiped with the roll paper soaked with alcohol. During cleaning, the vacuum pipeline connected to the vacuum cleaning suction chamber is used to adsorb the roll paper on the suction chamber, so that the roll paper is flat and fully in contact with the steel mesh, thereby increasing the cleaning capacity of the roll paper. The cleaned roll paper is rotated to the other side through the reel device. In this type of equipment, multiple nozzles can be installed on a single suction chamber according to the length of the product to achieve multi-point spraying of cleaning fluids such as alcohol. Since the multiple nozzles are fixedly arranged and connected to the alcohol barrel through a pumping pipeline, the differences in the positions of different nozzles will cause different alcohol spraying amounts. In actual use, uneven spraying amounts of multiple nozzles often occur, resulting in unsatisfactory cleaning effects. In order to solve this problem, the overall spraying amount of the nozzles is often increased. During the cleaning process, the vacuum cleaning suction chamber is combined with negative pressure suction, and excess alcohol is sucked into the suction chamber, which not only wastes the cleaning fluid, but also seriously affects the service life of the vacuum component. Summary of the invention:

[0004] The utility model aims at the shortcomings and deficiencies in the prior art and proposes an automatic cleaning device for a solder paste printer which can ensure the cleaning efficiency, increase the service life of the steel mesh, and has a reasonable structure and reliable operation.

[0005] The utility model achieves this through the following measures:

[0006] An automatic cleaning device for a solder paste printer is provided with a movable cleaning liquid spraying assembly, a paper roll retracting assembly, and a vacuum negative pressure suction assembly. The vacuum negative pressure suction assembly is provided with a vacuum suction chamber and is located below a steel mesh to be cleaned. The invention is characterized in that the paper roll retracting assembly releases or retracts the cleaning paper along the upper side of the steel mesh to be cleaned, and the movable cleaning liquid spraying assembly sprays cleaning liquid along the top of the paper roll; the movable cleaning liquid spraying assembly is provided with a cleaning liquid spraying assembly and a spraying drive mechanism, and the cleaning liquid spraying assembly is driven by the spraying drive mechanism to perform linear reciprocating motion.

[0007] The spraying drive mechanism of the utility model is provided with a stepping motor, a synchronous belt, a pulley, and a pulley fixing plate. The synchronous belt is sleeved on two pulleys, one of which is connected to the pulley fixing plate via a wheel shaft, and the other pulley is driven to rotate by the stepping motor. The inner side of the synchronous belt and the outer periphery of the pulley are provided with meshing teeth and grooves.

[0008] The cleaning liquid spraying assembly of the utility model is provided with a spray head or nozzle and a fixed plate. The spray head or nozzle is mounted on the fixed plate and connected to the cleaning liquid storage barrel via a pipeline. A flow regulating valve may be provided on the pipeline. The fixed plate is fixedly connected to the synchronous belt. Further, the fixed plate adopts an L-shaped fixed plate. The horizontal section of the L-shaped fixed plate is fixedly connected to the spray head or nozzle, and the vertical section of the L-shaped fixed plate is fixedly connected to the bottom plate of the slider. The bottom plate of the slider and the toothed cover plate are respectively pressed on the lower side and the upper side of the synchronous belt and are locked and fixed by screws.

[0009] The utility model is also provided with a spraying guide mechanism, which includes two guide shaft brackets respectively arranged at both ends of the synchronous belt, a guide shaft arranged parallel to the extension direction of the synchronous belt is arranged between the two guide shaft brackets, a ball screw base is sleeved on the guide shaft, and the ball screw base is connected to the cleaning liquid spraying assembly, further, two guide shafts arranged in parallel are arranged between the two guide shaft brackets, further, anti-collision blocks are respectively arranged at both ends of the guide shaft, and the anti-collision blocks can adopt anti-collision sleeves.

[0010] The ball screw base in the spraying guide mechanism of the utility model is fixedly connected to the bottom plate of the slider.

[0011] The paper roll retracting assembly of the utility model is provided with a paper roll fixing shaft, a paper roll receiving roller and a motor for driving the paper roll receiving roller to rotate. The paper roll retracting assembly is arranged below the nozzle or the nozzle via a lifting mechanism and is located at the rear side of the steel mesh to be cleaned. The lifting mechanism can adopt an electric cylinder to drive the paper roll retracting assembly to rise to the rear side of the steel mesh to be cleaned, or drive the paper roll retracting assembly to descend to the bottom of the steel mesh to be cleaned.

[0012] When the utility model is working, the movable cleaning liquid spraying assembly is turned on, so that the spray head or nozzle moves along the length direction of the steel mesh to be cleaned and sprays alcohol at the same time, and the sprayed alcohol evenly soaks the roll of paper, and the steel mesh to be cleaned is placed below the nozzle or nozzle provided in the cleaning liquid spraying assembly, and is located at the front side of the roll of paper taking-up and releasing assembly, and the roll of paper assembly moves from the initial position to the bottom of the steel mesh, and the soaked roll of paper is attached to the steel mesh to be cleaned and wipes the steel mesh under the negative pressure action of the vacuum negative pressure suction assembly under the steel mesh, and after wiping, the roll of paper taking-up and releasing assembly returns to the initial position, releases the wiped roll of paper, and completes the cleaning work. In this process, since the cleaning liquid can be driven by the synchronous belt to reciprocate along a straight line, the position limitation of the existing fixed nozzle is broken through, and the cleaning liquid is sprayed more evenly, and the cleaning liquid is sprayed down along the upper side of the roll of paper and is fully absorbed by the roll of paper, so as to avoid the excess cleaning liquid being sucked in by the vacuum negative pressure suction assembly, thereby effectively improving the service life of the vacuum negative pressure suction assembly.

[0013] Compared with the prior art, the utility model has the remarkable advantages of reasonable structure, good cleaning effect, long product service life, reliable operation and the like. Description of the drawings:

[0014] Attached Figure 1 It is a structural schematic diagram of the utility model.

[0015] Attached Figure 2 It is a structural schematic diagram of a mobile cleaning liquid spraying component in the utility model.

[0016] Attached Figure 3 It is a schematic diagram of the installation structure of the stepping motor in the utility model.

[0017] Attached Figure 4 It is a schematic diagram of the nozzle structure in the utility model.

[0018] Attached Figure 5 It is a schematic diagram of the installation structure of the ball screw support in the utility model.

[0019] Figure numerals: nozzle 1, anti-loosening nut cap 2, flow regulating valve 3, guide shaft bracket 5, pulley 4, anti-collision block 6, guide shaft 7, stepper motor 8, upper cover plate 9, ball screw support 10, transfer valve 11, PVC hose 12, slider back plate 13, bottom plate 14, synchronous belt 15, L-shaped nozzle fixing part 16, pulley mounting plate 17, toothed cover plate 18, roll paper retracting and releasing assembly 19. Specific implementation method:

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] As attached Figure 1 And attached Figure 2As shown, the utility model proposes an automatic cleaning device for a solder paste printer, which is provided with a movable cleaning liquid spraying assembly, a paper roll retracting assembly 19, and a vacuum negative pressure suction assembly. The vacuum negative pressure suction assembly is provided with a vacuum suction chamber and is located below the steel mesh to be cleaned. The paper roll retracting assembly 19 releases or retracts the cleaning paper along the upper side of the steel mesh to be cleaned, and the movable cleaning liquid spraying assembly sprays cleaning liquid along the top of the paper roll; the movable cleaning liquid spraying assembly is provided with a cleaning liquid spraying assembly and a spraying drive mechanism, and the cleaning liquid spraying assembly is driven by the spraying drive mechanism to perform linear reciprocating motion.

[0022] The spraying drive mechanism of the utility model is provided with a stepper motor 9, a synchronous belt 15, a pulley 4, and a pulley fixing plate 17. The synchronous belt 15 is sleeved on two pulleys 4, one of which is fixed on the pulley fixing plate 17 via a wheel shaft, and the other pulley 4 is driven to rotate by the stepper motor 9. The inner side of the synchronous belt 15 and the outer periphery of the pulley 4 are provided with meshing teeth and grooves.

[0023] The cleaning liquid spraying assembly of the utility model is provided with a spray head or nozzle and a fixed plate. The spray head or nozzle is installed on the fixed plate and is connected to the cleaning liquid storage barrel via a pipeline. A flow regulating valve 3 may be provided on the pipeline. The fixed plate is fixedly connected to the synchronous belt 15. Further, the fixed plate adopts an L-shaped fixed plate. The horizontal section of the L-shaped fixed plate is fixedly connected to the spray head or nozzle, and the vertical section of the L-shaped fixed plate is fixedly connected to the bottom plate of the slider. The bottom plate 14 of the slider and the toothed cover plate 18 are respectively pressed on the lower side and the upper side of the synchronous belt 15, and are locked and fixed by screws.

[0024] The utility model is also provided with a spraying guide mechanism, which includes two guide shaft brackets 5 respectively arranged at both ends of the synchronous belt 15, a guide shaft 7 arranged parallel to the extending direction of the synchronous belt 15 is provided between the two guide shaft brackets 5, a ball screw base 10 is sleeved on the guide shaft 7, and the ball screw base 10 is connected to the cleaning liquid spraying assembly.

[0025] Furthermore, two parallel guide shafts 7 are provided between the two guide shaft brackets 5. Furthermore, anti-collision blocks 6 are provided at both ends of the guide shafts, and the anti-collision blocks 6 can be anti-collision sleeves.

[0026] The ball screw base 8 in the spray guide mechanism of the utility model is fixedly connected to the slider base plate.

[0027] The paper roll retracting assembly of the utility model is provided with a paper roll fixing shaft, a paper roll receiving roller and a motor for driving the paper roll receiving roller to rotate, which is the prior art and will not be described in detail.

[0028] Example:

[0029] As attached Figure 2As shown, this example provides an automatic cleaning device for a solder paste printer. In this example, the nozzle 1 is connected together and fixed on an L-shaped nozzle fixing member 16 through a pair of anti-loosening nuts 2 and a flow regulating valve 3; as shown in the attached Figure 4 As shown, the nozzle fixing hole on the L-shaped nozzle fixing member 16 is a waist-shaped hole, and the position of the nozzle 1 is adjustable; the L-shaped nozzle fixing member 16 is fixed on the slider bottom plate 14, and the fixing hole on the L-shaped nozzle fixing member 16 is a waist-shaped hole, and the installation position is adjustable up and down; as shown in the attached Figure 5 As shown, two ball screw supports 10 are mounted on two straight rod type guide shafts 7, connected and fixed together using an upper cover plate 9, and the straight rod type guide shaft 7 is fixed on a guide shaft bracket 5; a pulley mounting plate 17 is fixed on the guide shaft bracket, a motor 8 and a pulley 4 are mounted on one end, and a driven pulley 4 is mounted on the other end;

[0030] like Figure 5 As shown, the movement of the ball screw support 10 is completed by pressing the synchronous belt 15 into the toothed cover plate 18 and fixing it on the slider bottom plate 14, and driving the pulley 4 through the forward and reverse rotation of the stepper motor 8. The anti-collision block 6 is installed on the two straight rod guide shafts 7 to limit the position. Alcohol passes from the transfer valve 11 through the PVC hose 12, the slider back plate 13 and the bottom plate 14, and the circular hole on the L-shaped nozzle fixing part 16 to enter the flow control valve 3. The knob on the flow control valve 3 can be manually adjusted to control the amount of alcohol sprayed by the nozzle 1.

[0031] During operation, the stepping motor 8 and the pulley 4 drive the synchronous belt 15 to move (such as Figure 3 As shown), the toothed cover plate is engaged with the synchronous belt 15 and fixed to the slider base plate 14 by screws, so that the slider assembly can move on the straight rod guide shaft 7 following the synchronous belt 15 (as shown in FIG. Figure 5 The nozzle 1 is connected to the flow regulating valve 3 through the anti-loosening nut 2, and the nozzle flow can be adjusted by the knob on the flow regulating valve 3, forming a nozzle assembly of the cleaning structure. The nozzle assembly is fixed to the bottom plate 14 of the slider assembly through the L-shaped nozzle fixing part 16, so that the nozzle assembly can be connected to the bottom plate 14 of the slider assembly. Figure 5 Slider assembly linkage, input PCB board length through software Figure 1 The motor controls the moving stroke; as described above, by controlling a single nozzle to spray alcohol through a motor, precise control of PCB cleaning strokes of different lengths can be achieved and a large amount of cleaning materials can be saved.

[0032] Compared with the prior art, the utility model has the remarkable advantages of reasonable structure, good cleaning effect, long product service life, reliable operation and the like.

Claims

1. An automatic cleaning device for a solder paste printer, comprising a mobile cleaning liquid spraying assembly, a paper roll retracting assembly, and a vacuum negative pressure suction assembly, wherein the vacuum negative pressure suction assembly is provided with a vacuum suction chamber and is located below a steel mesh to be cleaned, and is characterized in that: The paper roll retracting assembly releases or retracts the cleaning paper roll along the upper side of the steel mesh to be cleaned, and the mobile cleaning liquid spraying assembly sprays the cleaning liquid along the top of the paper roll; the mobile cleaning liquid spraying assembly is provided with a cleaning liquid spraying assembly and a spraying driving mechanism, and the cleaning liquid spraying assembly is driven by the spraying driving mechanism to perform linear reciprocating motion.

2. The automatic cleaning device for a solder paste printer according to claim 1, characterized in that: The spraying drive mechanism is provided with a stepper motor, a synchronous belt, a pulley, and a pulley fixing plate. The synchronous belt is sleeved on two pulleys, one of which is connected to the pulley fixing plate via a wheel shaft, and the other pulley is driven to rotate by the stepper motor. The inner side of the synchronous belt and the outer periphery of the pulley are provided with meshing teeth.

3. The automatic cleaning device for a solder paste printer according to claim 1, characterized in that: The cleaning liquid spraying assembly is provided with a spray head or nozzle and a fixed plate. The spray head or nozzle is installed on the fixed plate and connected to the cleaning liquid storage tank through a pipeline. A flow regulating valve is provided on the pipeline. The fixed plate is fixedly connected to the synchronous belt.

4. The automatic cleaning device for a solder paste printer according to claim 3, characterized in that: The fixing plate adopts an L-shaped fixing plate, the horizontal section of the L-shaped fixing plate is fixedly connected to the nozzle or the nozzle, the vertical section of the L-shaped fixing plate is fixedly connected to the slider bottom plate, the slider bottom plate and the toothed cover plate are respectively pressed on the lower side and the upper side of the synchronous belt, and are locked and fixed by screws.

5. The automatic cleaning device for a solder paste printer according to claim 4, characterized in that: A spraying guide mechanism is also provided, which includes two guide shaft brackets respectively arranged at both ends of the synchronous belt, a guide shaft arranged parallel to the extension direction of the synchronous belt is provided between the two guide shaft brackets, a ball screw base is sleeved on the guide shaft, and the ball screw base is connected to the cleaning liquid spraying assembly; the ball screw base in the spraying guide mechanism is fixedly connected to the bottom plate of the slider.

6. The automatic cleaning device for a solder paste printer according to claim 1, characterized in that: The roll paper taking-up and unwinding assembly is provided with a roll paper fixing shaft, a roll paper taking-up roller and a motor for driving the roll paper taking-up roller to rotate.

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