A stencil cleaning device for SMT placement machines

Abstract

This utility model relates to the field of stencil cleaning technology and discloses a stencil cleaning device for an SMT pick-and-place machine. The inner bottom and top walls of the housing are equipped with clamping components, and an STM stencil is clamped between two of the upper and lower clamping components. High-pressure water nozzles are fixedly installed on both side walls of the housing. By placing the STM stencil in the gap between two fan-shaped clamping plates, two motor reducers synchronously drive gears to rotate, which in turn drive two external gear rings to rotate synchronously. The external gear rings then drive racks on both sides to slide synchronously. The racks, through connecting rods, drive the four fan-shaped clamping plates to move closer together and tighten, thereby clamping and fixing the STM stencil. The two clamping components are symmetrically arranged, allowing simultaneous clamping and fixing of the top and bottom of the STM stencil. The larger side dimensions of the fan-shaped clamping plates result in a larger contact area with the STM stencil, thus increasing the clamping strength.

Description

Technical Field

[0001] This utility model relates to the field of stencil cleaning technology, specifically a stencil cleaning device for SMT pick and place machines. Background Technology

[0002] Printing is the first step in the SMT process, and the stencil is an important tool for solder paste printing. The stencil is actually a thin steel sheet with openings at the corresponding positions of the circuit board pads, allowing the solder paste to be printed onto it. After that, the components can be attached and soldered. After using the stencil, the solder paste and other contaminants adhering to it must be cleaned off to prevent the workpieces from being contaminated in the next batch.

[0003] Conventional cleaning methods utilize high-speed water jets from spray equipment. The impact of these high-speed water jets can not only wash away solder paste but also shake and vibrate the stencil, potentially causing it to fall off, resulting in poor cleaning effectiveness. Currently, stencils are fixed by using screws to press and secure them at the four corners. However, the contact area between the screws and the stencil is small, and the stencil may fall off and separate once impacted by high-speed water jets. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a stencil cleaning device for SMT placement machines, which has the advantage of clamping and fixing the stencil, thus solving the aforementioned problems.

[0006] (II) Technical Solution

[0007] To achieve the aforementioned purpose of clamping and fixing the stencil, this utility model provides the following technical solution: A stencil cleaning device for an SMT placement machine, comprising a housing, a sealing door hinged to the front of the housing, clamping components provided on the inner bottom and top walls of the housing, an STM stencil clamped between the two upper and lower clamping components, high-pressure water nozzles fixedly installed on both side walls of the housing, solenoid valves fixedly installed at the inlet ends of the high-pressure water nozzles, the other ends of the solenoid valves connected to a high-pressure water pump via pipes, water pumps fixedly installed below both side walls of the housing, L-shaped water nozzles fixedly installed at the pumping ends of the water pumps, multiple sections of electric telescopic rods hinged to the rear inner wall of the housing, an electric push rod one fixedly installed at the output end of the multiple sections of electric telescopic rods, a brush servo motor fixedly installed at the output end of the electric push rod one, a strip brush detachably installed at the output end of the brush servo motor, and an electric push rod two hinged between the multiple sections of electric telescopic rods and the rear wall of the housing.

[0008] Preferably, the clamping assembly includes a tray that fits against a partition inside the housing. A shaft is fixedly installed at the bottom of the tray, and a self-locking rotary seat is fixedly installed at the bottom of the shaft. The self-locking rotary seat is installed on the inner wall of the housing, and a cover is fixedly installed at the bottom of the tray.

[0009] Preferably, two external gear rings arranged vertically are rotatably mounted on the outer side of the shaft. Gears mesh with the sides of the external gear rings. The gears are fixedly mounted to the output end of the motor reducer. The motor reducer is fixedly mounted to the shaft via a bracket.

[0010] Preferably, both sides of the upper and lower outer gear rings are engaged with racks, the racks are slidably installed in the sliding sleeve, and the sliding sleeve is fixedly installed to the bottom of the tray by a vertical rod.

[0011] Preferably, the rack is Z-shaped, with the upper and lower sets of racks arranged in a staggered grid pattern. A connecting rod is fixedly installed at the other end of the rack, and a fan-shaped clamp is fixedly installed at the top of the connecting rod. The fan-shaped clamp is slidably installed on the surface of the tray.

[0012] (III) Beneficial Effects

[0013] Compared with the prior art, this utility model provides a stencil cleaning device for SMT pick and place machines, which has the following beneficial effects:

[0014] This SMT placement machine stencil cleaning device places the STM stencil between two fan-shaped clamps on the left and right. Two motor reducers synchronously drive gears to rotate, which in turn drive two external gear rings to rotate synchronously. The external gear rings drive racks on both sides to slide synchronously. The racks drive the four fan-shaped clamps to move closer together and tighten via connecting rods, thereby clamping and fixing the STM stencil. The two clamping components are symmetrically arranged vertically, thus simultaneously clamping and fixing the top and bottom of the STM stencil. The fan-shaped clamps have a large side dimension, resulting in a large contact area with the STM stencil, thereby increasing the clamping firmness. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of the side cross-section structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the front cross-section structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the structure of this utility model after the casing has been removed;

[0019] Figure 5This is a schematic diagram of the clamping assembly and STM steel mesh of this utility model;

[0020] Figure 6 This is a schematic diagram of the structure of the shaft, external gear ring, and rack of this utility model;

[0021] Figure 7 This is an exploded structural diagram of the shaft, external gear ring, and rack of this utility model.

[0022] In the diagram: 1. Housing; 2. Sealing door; 3. Clamping assembly; 4. STM steel mesh; 5. High-pressure water nozzle; 6. Solenoid valve; 7. Water pump; 8. L-shaped water nozzle; 9. Multi-section electric telescopic rod; 10. Electric push rod one; 11. Brush servo motor; 12. Strip brush; 13. Electric push rod two; 31. Tray; 32. Shaft; 33. Self-locking rotary seat; 34. Cover; 35. External gear ring; 36. Gear; 37. Motor reducer; 38. Rack; 39. Sliding sleeve; 310. Vertical rod; 311. Connecting rod; 312. Fan-shaped clamp. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-4 A stencil cleaning device for an SMT pick and place machine includes a housing 1. A sealing door 2 is hinged to the front of the housing 1. A transparent window is embedded in the sealing door 2 for easy viewing during cleaning. Clamping components 3 are provided on the inner bottom wall and inner top wall of the housing 1. An STM stencil 4 is clamped and installed between the two upper and lower clamping components 3 to clamp and fix the top and bottom of the STM stencil 4.

[0025] Please see Figure 1-4 High-pressure water nozzles 5 are fixedly installed on both sides of the housing 1. Solenoid valves 6 are fixedly installed on the inlet end of each high-pressure water nozzle 5. The other end of the solenoid valve 6 is connected to the high-pressure water pump through a pipe. When the high-pressure water pump is running, the corresponding solenoid valve 6 is opened, and water will be sprayed out at high speed from the high-pressure water nozzle 5, thereby cleaning the solder paste on both sides of the STM stencil 4. A water pump 7 is fixedly installed on the lower side of both sides of the housing 1. An L-shaped water nozzle 8 is fixedly installed on the water pump 7. The L-shaped water nozzle 8 is attached to the partition of the housing 1. When the water pump 7 is running, it can extract and discharge the water deposited in the housing 1.

[0026] Please see Figure 1-4The rear inner wall of the housing 1 is hinged with multiple sections of electric telescopic rods 9. An electric push rod 10 is fixedly installed at the output end of each section of electric telescopic rod 9. A brushing servo motor 11 is fixedly installed at the output end of the electric push rod 10. A strip brush 12 is detachably installed at the output end of the brushing servo motor 11. An electric push rod 2 13 is hinged between the multiple sections of electric telescopic rods 9 and the rear wall of the housing 1. The multiple sections of electric telescopic rods 9 can move the brushing servo motor 11 forward, and the electric push rod 10 can move the strip brush 12 to both sides of the STM stencil 4. The brushing servo motor 11 drives the strip brush 12 to rotate eccentrically, thereby brushing both sides of the STM stencil 4. The electric push rod 2 13 can adjust the vertical rotation angle of the multiple sections of electric telescopic rods 9, thereby adjusting the brushing direction of the strip brush 12.

[0027] Please see Figure 5-7 The clamping assembly 3 includes a tray 31, which is attached to a partition inside the housing 1. A shaft 32 is fixedly installed at the bottom of the tray 31, and a self-locking rotary seat 33 is fixedly installed at the bottom of the shaft 32. The self-locking rotary seat 33 is installed on the inner wall of the housing 1, and a cover 34 is fixedly installed at the bottom of the tray 31. When installing the STM stencil 4, if the position of the fan-shaped clamp 312 is inconvenient, the tray 31 can be rotated, and then the self-locking rotary seat 33 locks the position, thus facilitating the convenient installation of the STM stencil 4.

[0028] Please see Figure 5-7 Two vertically arranged external gear rings 35 are rotatably mounted on the outer side of the shaft 32. Gears 36 mesh with the sides of the external gear rings 35. The gears 36 are fixedly mounted to the output end of the motor reducer 37, which is fixedly mounted to the shaft 32 via a bracket. The motor reducer 37 drives the gears 36 to rotate, which in turn drives the external gear rings 35 to rotate.

[0029] Please see Figure 5-7 Both sides of the upper and lower external gear rings 35 are engaged with racks 38, which are slidably mounted in the sliding sleeve 39. The sliding sleeve 39 is fixedly mounted to the bottom of the tray 31 via a vertical rod 310. The rotation of the external gear rings 35 will drive the racks 38 to move horizontally within the sliding sleeve 39.

[0030] Please see Figure 5-7 The rack 38 is Z-shaped, with the upper and lower sets of racks 38 arranged in a staggered crisscross pattern. A connecting rod 311 is fixedly installed at the other end of the rack 38, and a fan-shaped clamping plate 312 is fixedly installed on the top of the connecting rod 311. The fan-shaped clamping plate 312 is slidably mounted on the surface of the tray 31. The displacement of the rack 38 can drive the four fan-shaped clamping plates 312 to move closer or separate from each other, thereby achieving the clamping, fixing, or loosening of the STM stencil 4.

[0031] Working principle: In use, the STM steel mesh 4 is placed between the two fan-shaped clamping plates 312 on the left and right. The two motor reducers 37 drive the gear 36 to rotate synchronously. The gear 36 drives the two external gear rings 35 to rotate synchronously. The external gear rings 35 drive the racks 38 on both sides to slide synchronously. The racks 38 drive the four fan-shaped clamping plates 312 to move closer together and tighten through the connecting rod 311, thereby clamping and fixing the STM steel mesh 4. The two clamping components 3 are symmetrically arranged vertically, thereby clamping and fixing the top and bottom of the STM steel mesh 4 at the same time. The side dimensions of the fan-shaped clamping plates 312 are relatively large, resulting in a large contact area with the STM steel mesh 4, thereby increasing the clamping firmness.

[0032] After the STM stencil 4 is clamped and fixed, the high-pressure water nozzles 5 on both sides spray high-speed water to rinse both sides of the STM stencil 4. Then, the brushing servo motor 11 is moved forward by the multi-section electric telescopic rod 9, and the strip brush 12 is moved to both sides of the STM stencil 4 by the electric push rod 10. The brushing servo motor 11 drives the strip brush 12 to rotate eccentrically, thereby brushing both sides of the STM stencil 4. The up and down rotation angle of the multi-section electric telescopic rod 9 can be adjusted by the electric push rod 2 13, thereby adjusting the brushing direction of the strip brush 12.

[0033] After the STM stencil 4 is brushed by the strip brush 12, the strip brush 12 hangs down due to gravity. The electric push rod 10 retracts, taking the strip brush 12 away from the STM stencil 4. The multi-section electric telescopic rod 9 retracts, taking the brushing servo motor 11 backward. The electric push rod 2 13 extends to its maximum, and then takes the multi-section electric telescopic rod 9 and the brushing servo motor 11 upward and rotates away from the STM stencil 4. Then, the STM stencil 4 is rinsed again with a high-speed water flow. During the two rinsing cycles, the water pump 7 runs synchronously to extract and discharge the water deposited in the casing 1.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A stencil cleaning device for an SMT pick and place machine, comprising a housing (1), wherein a sealing door (2) is hinged to the front of the housing (1), characterized in that: The inner bottom wall and inner top wall of the housing (1) are provided with clamping components (3), and an STM steel mesh (4) is clamped between the two upper and lower clamping components (3). High-pressure water nozzles (5) are fixedly installed on both sides of the housing (1). Solenoid valves (6) are fixedly installed at the water inlet end of the high-pressure water nozzles (5). The other end of the solenoid valves (6) is connected to the high-pressure water pump through a pipe. Water pumps (7) are fixedly installed at the bottom of both sides of the housing (1). The water pumps (7) pump water. An L-shaped water nozzle (8) is fixedly installed at the end of the housing (1). Multiple electric telescopic rods (9) are hinged to the rear inner wall of the housing (1). An electric push rod (10) is fixedly installed at the output end of the multiple electric telescopic rods (9). A brushing servo motor (11) is fixedly installed at the output end of the electric push rod (10). A strip brush (12) is detachably installed at the output end of the brushing servo motor (11). An electric push rod (13) is hinged between the multiple electric telescopic rods (9) and the rear wall of the housing (1).

2. The stencil cleaning equipment for an SMT placement machine according to claim 1, characterized in that: The clamping assembly (3) includes a tray (31) which is attached to a partition inside the housing (1). A shaft (32) is fixedly installed at the bottom of the tray (31). A self-locking rotary seat (33) is fixedly installed at the bottom of the shaft (32). The self-locking rotary seat (33) is installed on the inner wall of the housing (1). A cover (34) is fixedly installed at the bottom of the tray (31).

3. The stencil cleaning equipment for an SMT placement machine according to claim 2, characterized in that: Two external gear rings (35) arranged vertically are rotatably mounted on the outer side of the shaft (32). Gears (36) mesh with the side of the external gear rings (35). The gears (36) are fixedly mounted to the output end of the motor reducer (37). The motor reducer (37) is fixedly mounted to the shaft (32) through a bracket.

4. The stencil cleaning equipment for an SMT pick and place machine according to claim 3, characterized in that: Both sides of the upper and lower outer gear rings (35) are engaged with racks (38), which are slidably installed in the sliding sleeve (39). The sliding sleeve (39) is fixedly installed to the bottom of the tray (31) by a vertical rod (310).

5. The stencil cleaning equipment for an SMT placement machine according to claim 4, characterized in that: The rack (38) is Z-shaped, and the upper and lower racks (38) are arranged in a staggered grid pattern. A connecting rod (311) is fixedly installed at the other end of the rack (38), and a fan-shaped clamp (312) is fixedly installed on the top of the connecting rod (311). The fan-shaped clamp (312) is slidably installed on the surface of the tray (31).

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