Circuit board smT processing silk-screen printing jig

Abstract

The utility model relates to the technical field of circuit board printing, and discloses a circuit board smT processing silk-screen printing jig which comprises a supporting table, a processing table is fixedly connected to the top side of the supporting table, vertical plates are fixedly connected to the four corners of the top side of the processing table, and a cover plate is fixedly connected to the top sides of the vertical plates. A machining assembly is arranged on the bottom side of the cover plate, two strip-shaped plates are fixedly connected to the bottom side of the middle of the machining assembly, a reset assembly is arranged at the top ends of the strip-shaped plates, square blocks are slidably connected to the front end and the rear end of the reset assembly, and connecting rods are fixedly connected to the bottom sides of the square blocks. According to the utility model, when the circuit board is pressed down by the brush plate, the friction and impact between the brush plate and the circuit board are reduced, the abrasion degree of the brush plate is reduced, the service life of the brush plate is prolonged, and jig plates of different models can be replaced and customized as required.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit board printing, in particular to a circuit board SMT processing screen printing fixture. Background Art

[0002] The PCB SMT processing screen printing jig is an important tool used in the solder paste printing stage of the surface mount technology (SMT) production process. This jig helps to ensure the accurate positioning and fixation of the PCB so that it is aligned with the solder paste screen so that the solder paste can be evenly applied to the PCB surface. The jig usually includes components such as PCB positioning fixtures, adjustment screws, pressure plates and support structures to ensure that the PCB remains stable during the printing process. With a properly designed jig, it is possible to ensure that the solder paste is evenly distributed on the PCB, ultimately ensuring soldering quality and reliability.

[0003] After searching, the Chinese patent document announcement number: CN218197431U discloses a fully automatic circuit board screen printing equipment, including a support frame, and a transmission mechanism is arranged inside the support frame. In the utility model, the air is transmitted to the exhaust pipe through the air inlet pipe by the operation of the fan, and the temperature of the air is reduced by the operation of the refrigeration plate so that the air is blown to the surface of the circuit board to cool the solder paste. The operation of the first gas rod drives the brush plate to brush off the residual material on the surface of the circuit board. The setting of this structure can effectively dry the solder paste or other materials during printing and brush off the excess materials to prevent the printing surface from being contaminated during transportation, thereby solving the problem that the residual solder paste or other printing materials are stored on the circuit board during printing of the fully automatic circuit board screen printing equipment, which is easy to contaminate the printing surface during the back and forth transportation process, and it is troublesome to clean it manually. At the same time, the printing screen needs to be cleaned after printing several times.

[0004] Regarding the above-mentioned related technologies, the inventor believes that the above patent mentioned in the specific implementation mode: "The operation of the first air rod 14 drives the brush plate 15 to brush off the residual material on the surface of the circuit board". Although the above patent uses the cylinder to push the brush plate to print the circuit board machine, during the specific operation process, there will be friction and impact between the brush plate and the circuit board, causing the brush plate to be worn and shortening the service life of the brush plate. Therefore, in view of the above shortcomings, a circuit board SMT processing screen printing jig is proposed. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings existing in the prior art, and to propose a circuit board SMT processing screen printing fixture, aiming to improve the problem in the prior art that the brush plate will generate friction and impact when printing on the circuit board, resulting in a shortened service life of the brush plate.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A circuit board SMT processing screen printing jig comprises a support table, the top side of the support table is fixedly connected to a processing table, the four corners of the top side of the processing table are fixedly connected to vertical plates, the top sides of multiple vertical plates are fixedly connected to cover plates, the bottom side of the cover plate is provided with a processing component, the middle bottom side of the processing component is fixedly connected to two strip plates, the top of the strip plate is provided with a reset component, the front and rear ends of the reset component are slidably connected to square blocks, the bottom side of the square block is fixedly connected to a connecting rod, the bottom side of the connecting rod is fixedly connected to a sliding rod, the outside of each two sliding rods are slidably connected to a brush plate, the front and rear ends of the brush plate are provided with T-shaped cavities, and the front and rear sides of the brush plate are fixedly connected to limiting plates.

[0008] As a further description of the above technical solution:

[0009] The processing assembly includes two electric push rods, the top sides of the two electric push rods are respectively fixedly connected to the left and right ends of the bottom side of the cover plate, the driving end of the electric push rod is fixedly connected to a vertical block, the adjacent sides of the two vertical blocks are fixedly connected to a support box, the tops of the adjacent sides of the two support boxes are fixedly connected to an electric slide rail, the internal sliding assembly of the electric slide rail has a sliding block, the outside of the sliding block is fixedly connected to a connecting box, the bottom side of the connecting box is fixedly connected to a support plate, the left and right ends of the support plate are fixedly connected to a cylinder, the driving end of the cylinder is fixedly connected to the top side of the strip plate, and the left and right ends of the bottom side of the processing assembly are fixedly connected to a pressure plate.

[0010] As a further description of the above technical solution:

[0011] The left and right ends of the pressure plate are fixedly connected with fixed blocks, a rotating assembly is arranged inside the fixed block, a turning handle is fixedly connected to the top side of the rotating assembly, the bottom ends of the adjacent sides of the two fixed blocks are fixedly connected with bottom blocks, the top side of the bottom block is fixedly connected with a connecting block, the outside of the connecting block is slidably connected with a connecting block, and the adjacent sides of the two connecting blocks are fixedly connected with a jig plate.

[0012] As a further description of the above technical solution:

[0013] A protective box is fixedly connected to the right end of the rear side of the processing table, and a driving assembly is fixedly connected to the rear side of the inner wall of the protective box. Wheels are fixedly connected to the front and rear ends of the driving assembly, and belts are sleeved on the outside of each two of the wheels. A driving wheel is fixedly connected to the rear end of the driving assembly, and two semicircular blocks are fixedly connected to the front side of the driving wheel, wherein a sliding shaft is slidably connected to the inside of the two vertical plates, a fixed detector is provided in the middle of the processing table, a disc is fixedly connected to the rear end of the sliding shaft, and spring 2 is fixedly connected to the front and rear sides of the disc, a force plate is fixedly connected to the bottom side of the rear end of the sliding shaft, a cleaning assembly is fixedly connected to the middle of the sliding shaft, and a plurality of brushes are fixedly connected to the bottom side of the cleaning assembly.

[0014] As a further description of the above technical solution:

[0015] The two reset assemblies each comprise a fixing rod, the outside of which is fixedly connected to the inner wall of the top end of the strip plate, and the outside of which is sleeved with a spring.

[0016] As a further description of the above technical solution:

[0017] The adjacent sides of the plurality of square blocks are respectively fixedly connected to the distant sides of the two springs, and the outer sides of the plurality of connecting rods are respectively slidably connected to the inner walls of the two brush plates.

[0018] As a further description of the above technical solution:

[0019] The two rotating components each include a threaded rod, the outer thread of the threaded rod is connected to the inner wall of the fixed block, the top of the threaded rod is fixedly connected to a circular plate, the outer parts of the two circular plates are respectively rotatably connected to the left and right inner walls of the pressure plate, and the bottom side of the connecting block is in contact with the top side of the bottom block.

[0020] As a further description of the above technical solution:

[0021] The inner wall of the fixed detector is fixedly connected with a solenoid valve, a reversing valve is arranged on the rear side of the solenoid valve, and a vacuum breaking valve is arranged on the left side of the solenoid valve.

[0022] As a further description of the above technical solution:

[0023] The driving assembly comprises a motor, the rear side of the motor is fixedly connected to the rear side of the inner wall of the protection box, and the driving end of the motor is fixedly connected to a rotating shaft.

[0024] As a further description of the above technical solution:

[0025] The cleaning assembly comprises a fixed box, the inner wall of the fixed box is fixedly connected to the middle outer wall of the sliding shaft, and a cleaning plate is fixedly connected to the bottom side of the fixed box.

[0026] The utility model has the following beneficial effects:

[0027] 1. In the utility model, by using the fixed rod, square block, connecting rod, sliding rod, brush plate and other structures in coordination, the friction and impact between the brush plate and the circuit board can be reduced when the brush plate presses down on the circuit board, the wear degree of the brush plate can be reduced, and the service life of the brush plate can be extended.

[0028] 2. In the utility model, by using the fixed block, threaded rod, round plate, handle, connecting block, connecting block and other structures in coordination, different types of jig plates can be replaced. Different types of jig plates can be customized as needed to adapt to products of different models or sizes, so that the production line can easily switch to produce products of different models, thereby improving the flexibility and diversity of the production line.

[0029] 3. In the utility model, by using the disc, the force plate, the fixed box cleaning plate, the brush, the bottom block and other structures in coordination, the printing plate can be automatically fed, and the printing plate can be quickly and accurately sent to the printing equipment, saving the time of manual operation, thereby improving the production efficiency; at the same time, the surface cleaning can also be carried out without affecting the production speed, further improving the overall production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A three-dimensional diagram of a circuit board SMT processing screen printing jig proposed by the utility model;

[0031] Figure 2 This is a schematic diagram of the internal structure of a strip plate of a screen printing jig for SMT processing of a circuit board proposed by the utility model;

[0032] Figure 3 This is a schematic diagram of the internal structure of a press plate of a screen printing jig for SMT processing of a circuit board proposed by the utility model;

[0033] Figure 4 This is a schematic diagram of the fixed block structure of a circuit board SMT processing screen printing fixture proposed by the utility model;

[0034] Figure 5 This is a schematic diagram of the internal structure of a protective box for a circuit board SMT processing screen printing fixture proposed by the utility model;

[0035] Figure 6 The utility model provides a schematic diagram of the solenoid valve structure of a circuit board SMT processing screen printing fixture.

[0036] Legend:

[0037] 1. Support table; 2. Processing table; 3. Vertical plate; 4. Cover plate; 5. Electric push rod; 6. Vertical block; 7. Support box; 8. Electric slide rail; 9. Connecting box; 10. Support plate; 11. Cylinder; 12. Strip plate; 13. Fixed rod; 14. Spring 1; 15. Square block; 16. Connecting rod; 17. Sliding rod; 18. Brush plate; 19. T-shaped cavity; 20. Limit plate; 21. Press plate; 22. Fixed block; 23. Threaded rod; 24. Round plate; 2 5. Turning handle; 26. Connecting block; 27. Connecting block; 28. Jig plate; 29. ​​Protective box; 30. Rotating shaft; 31. Wheel; 32. Belt; 33. Driving wheel; 34. Semicircular block; 35. Motor; 36. Sliding shaft; 37. Fixed detector; 38. Disc; 39. Spring 2; 40. Force plate; 41. Fixed box; 42. Cleaning plate; 43. Brush; 44. Bottom block; 45. Solenoid valve; 46. Reversing valve; 47. Vacuum breaking valve. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] Reference Figure 1 - Figure 2 , an embodiment provided by the utility model: a circuit board smT processing screen printing fixture, including a support table 1, providing a stable platform to support the entire processing fixture, the top side of the support table 1 is fixedly connected with a processing table 2 for providing supporting force, the four corners of the top side of the processing table 2 are fixedly connected with vertical plates 3 to enhance the stability of the structure and at the same time serve as a support for a cover plate 4, the top sides of multiple vertical plates 3 are fixedly connected with the cover plate 4, the bottom side of the cover plate 4 is provided with a processing assembly, the processing assembly includes two electric push rods 5, the top sides of the two electric push rods 5 are respectively fixedly connected to the left and right ends of the bottom side of the cover plate 4, the driving end of the electric push rod 5 is fixedly connected with a vertical block 6, which is responsible for pushing the vertical block 6 to adjust the position, the adjacent sides of the two vertical blocks 6 are fixedly connected with a support box 7 to provide supporting force for the support box 7, and the adjacent sides of the two support boxes 7 are fixedly connected with an electric slide rail 8 to push the connection box 9 to slide left and right;

[0040] The internal sliding assembly of the electric slide rail 8 has a sliding block, and the outside of the sliding block is fixedly connected with a connection box 9 to provide support force for the support plate 10. The bottom side of the connection box 9 is fixedly connected with the support plate 10. Two strip plates 12 are fixedly connected to the bottom side of the middle part of the processing assembly. The left and right ends of the support plate 10 are fixedly connected with a cylinder 11, a driving source. The driving end of the cylinder 11 is fixedly connected to the top side of the strip plate 12, and the strip plate 12 is pushed up and down by driving the cylinder 11. The left and right ends of the bottom side of the processing assembly are fixedly connected with a pressing plate 21. The top of the strip plate 12 is provided with a reset assembly. The two reset assemblies both include a fixed rod 13. The outside of the fixed rod 13 is fixedly connected to the inner wall of the top of the strip plate 12 to provide support force for the fixed rod 13. The outside of the fixed rod 13 is provided with a spring 14;

[0041] The front and rear ends of the reset component are both slidably connected with square blocks 15, and the proximal sides of the multiple square blocks 15 are respectively fixedly connected to the far sides of the two springs 14 to fix and limit the springs 14 so that the springs 14 can be evenly stressed. The bottom side of the square block 15 is fixedly connected with a connecting rod 16, which pushes the square block 15 to slide after the connecting rod 16 is stressed. The bottom side of the connecting rod 16 is fixedly connected with a sliding rod 17, which is restricted by the inclined structure to drive the connecting rod 17 to slide. The outside of every two sliding rods 17 is slidably connected with a brush plate 18, and the outsides of the multiple connecting rods 16 are respectively slidably connected to the inner walls of the two brush plates 18. T-shaped cavities 19 are provided at the front and rear ends of the brush plates 18, and limiting plates 20 are fixedly connected to the front and rear sides of the brush plates 18.

[0042] Reference Figure 1 , Figure 3 and Figure 4 The left and right ends of the pressure plate 21 are fixedly connected with fixed blocks 22 to provide support for the fixed blocks 22. A rotating assembly is arranged inside the fixed blocks 22. The two rotating assemblies include a threaded rod 23. The outer thread of the threaded rod 23 is connected to the inner wall of the fixed block 22. The fixed block 22 is pushed to slide by the rotation of the threaded rod 23. The top of the threaded rod 23 is fixedly connected with a circular plate 24. The threaded rod 23 is pushed to slide by holding the circular plate 24. The outer parts of the two circular plates 24 are respectively connected to the left and right sides of the pressure plate 21. The inner walls at both ends are used to limit the rotation of the threaded rod 23. The top side of the rotating assembly is fixedly connected with a turning handle 25. The bottom ends of the adjacent sides of the two fixed blocks 22 are fixedly connected with a bottom block 44. The bottom side of the connecting block 27 is in contact with the top side of the bottom block 44 to limit the connecting block 27. The top side of the bottom block 44 is fixedly connected with a connecting block 26. The outside of the connecting block 26 is slidably connected with the connecting block 27. The adjacent sides of the two connecting blocks 27 are fixedly connected with a jig plate 28 to facilitate the replacement of jig plates 28 of different models.

[0043] Reference Figure 1 and Figure 5 , the right end of the rear side of the processing table 2 is fixedly connected to a protection box 29, and the rear side of the inner wall of the protection box 29 is fixedly connected to a driving assembly, which includes a motor 35, a driving source, and the rear side of the motor 35 is fixedly connected to the rear side of the inner wall of the protection box 29, so that the motor 35 can operate stably, and the driving end of the motor 35 is fixedly connected to a rotating shaft 30, and the rotating shaft 30 is driven to rotate by the driving motor 35, and the front and rear ends of the driving assembly are fixedly connected to wheels 31, thereby driving the wheels 31 to rotate, and the outside of each two wheels 31 is sleeved with belts 32, thereby driving the belts 32 to rotate, and the rear end of the driving assembly is fixedly connected to a driving wheel 33, and the front side of the driving wheel 33 is fixedly connected to two semicircular blocks 34, and the semicircular blocks 34 are driven to rotate by the driving wheel 33, and the inner sliding connection of the two vertical plates 3 is connected to a sliding shaft 36;

[0044] A fixed detector 37 is provided in the middle of the processing table 2, which is used to limit the circuit board to fix it. A disc 38 is fixedly connected to the rear end of the sliding shaft 36, and spring 2 39 is fixedly connected to the front and rear sides of the disc 38. The spring 2 39 is fixed so that the spring 2 39 can be evenly stressed. A force plate 40 is fixedly connected to the bottom side of the rear end of the sliding shaft 36, and the force plate 40 is pushed to slide by the rotation of the semicircular block 34. A cleaning component is fixedly connected to the middle part of the sliding shaft 36. The cleaning component includes a fixed box 41. The inner wall of the fixed box 41 is fixedly connected to the outer wall of the middle part of the sliding shaft 36. The fixed box 41 is driven to slide by the sliding shaft 36. A cleaning plate 42 is fixedly connected to the bottom side of the fixed box 41, thereby driving the cleaning plate 42 to slide. A plurality of brushes 43 are fixedly connected to the bottom side of the cleaning component for cleaning the circuit board.

[0045] Reference Figure 6 , the inner wall of the fixed detector 37 is fixedly connected with a solenoid valve 45, which is the control element in the entire vacuum adsorption system. It is responsible for controlling the flow direction of the gas source when the system needs to generate a vacuum or destroy an existing vacuum. When the solenoid valve 45 is energized, it will close the gas source passage to the vacuum generator and open the interface to the atmosphere, so that the atmosphere can quickly enter the system and destroy the original vacuum state. The rear side of the solenoid valve 45 is provided with a reversing valve 46, which is a valve commonly used in pneumatic control systems to change the direction of gas flow. In this system, the reversing valve 46 may be used to fine-tune the airflow to achieve more complex control logic, such as changing the direction of the airflow when it is necessary to switch the working state of the suction cup (absorption or release). The left side of the solenoid valve 45 is provided with a vacuum breaking valve 47, which quickly introduces atmospheric pressure when it is necessary to quickly release the object adsorbed by the suction cup, thereby destroying the low-pressure state in the vacuum suction cup. The vacuum breaking valve 47 is usually connected to the control system to ensure that the release instruction is accurately and quickly responded to at the appropriate time.

[0046] Working principle: We clamp the circuit board on the inner wall of the two processing tables 2, and then the belt 32 is pushed to the middle of the processing table 2 by friction. The fixed detector 37 detects the circuit board and fixes it. Then, the solder paste is applied to the top of the fixture plate 28, and then the electric push rod 5 pushes the vertical block 6 downward, thereby driving the support box 7 downward, and then pushes the pressure plate 21 to fit the circuit board, and then the electric slide rail 8 drives the connection box 9 to slide left and right, thereby driving the support plate 10 to slide left and right, and at the same time drives the cylinder 11 to push the strip plate 12 to slide downward, and then pushes The movable brush plate 18 slides downward and fits with the circuit board, and then slides left and right to evenly apply the solder paste. At the same time, the brush plate 18 is subjected to a reaction force after contacting the circuit board, so that the brush plate 18 can slide upward and push the sliding rod 17 to slide, and then drive the connecting rod 16 to slide, thereby driving the square block 15 to slide outside the fixed rod 13 and squeeze the spring 14, so that the spring 14 can store elastic potential energy, and then give the brush plate 18 a reverse force to reduce the friction between the brush plate 18 and the circuit board. At the same time, the limiting plate 20 can prevent the solder paste from spreading to the outside;

[0047] By holding the turning handle 25 and applying a rotating force, the threaded rod 23 is driven to rotate, thereby driving the circular plate 24 to rotate inside the pressing plate 21 to prevent the threaded rod 23 from deviating, and then the fixing block 22 is restricted on the inner wall of the pressing plate 21, so that the threaded rod 23 can drive the fixing block 22 to slide downward, thereby driving the bottom block 44 to slide downward, and then driving the connecting block 26 to slide downward, so that the fixture plate 28 and the connecting block 27 are subjected to gravity, so that they can slide downward together with the bottom block 44, and then it is convenient to replace the fixture plate 28, and different types of fixture plates 28 can be replaced. Different types of fixture plates 28 can be customized as needed to adapt to products of different models or sizes, so that the production line can easily switch to produce products of different models, thereby improving the flexibility and diversity of the production line;

[0048] After the circuit board is placed on the top side of the belt 32, the driving motor 35 drives the rotating shaft 30 to slide, thereby driving the wheel 31 to rotate, thereby driving the belt 32 to rotate and transport the circuit board. At the same time, the rotating shaft 30 will also drive the driving wheel 33 to rotate, thereby driving the semicircular block 34 to push the force plate 40 to slide, and the sliding shaft 36 is pushed to slide through the force plate 40, thereby driving the disc 38 to slide, and then the disc 38 will squeeze the spring 2 39 on the front side, and then store elastic potential energy, so that the disc 38 can be reset and pull the spring 2 39 on the rear side of the disc 38 to reset, and at the same time, the sliding shaft 36 will also drive the fixed box 41 to slide, and then drive the cleaning plate 42 to slide, thereby driving the brush 43 to clean the circuit board.

[0049] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A circuit board SMT processing screen printing jig, comprising a support table (1), characterized in that: The top side of the support platform (1) is fixedly connected to a processing platform (2), and the four corners of the top side of the processing platform (2) are fixedly connected to vertical plates (3), and the top sides of the plurality of vertical plates (3) are fixedly connected to cover plates (4). The bottom side of the cover plate (4) is provided with a processing component, and the middle bottom side of the processing component is fixedly connected to two strip plates (12), and the top of the strip plate (12) is provided with a reset component, and the front and rear ends of the reset component are slidably connected to square blocks (15), and the bottom side of the square block (15) is fixedly connected to a connecting rod (16), and the bottom side of the connecting rod (16) is fixedly connected to a sliding rod (17), and the outside of each two sliding rods (17) is slidably connected to a brush plate (18), and the front and rear ends of the brush plate (18) are provided with T-shaped cavities (19), and the front and rear sides of the brush plate (18) are fixedly connected to limiting plates (20).

2. A circuit board SMT processing screen printing jig according to claim 1, characterized in that: The processing assembly comprises two electric push rods (5), the top sides of the two electric push rods (5) are respectively fixedly connected to the left and right ends of the bottom side of the cover plate (4), the driving end of the electric push rod (5) is fixedly connected to a vertical block (6), the adjacent sides of the two vertical blocks (6) are fixedly connected to a support box (7), the top ends of the adjacent sides of the two support boxes (7) are fixedly connected to an electric slide rail (8), the internal sliding assembly of the electric slide rail (8) has a sliding block, the outside of the sliding block is fixedly connected to a connection box (9), the bottom side of the connection box (9) is fixedly connected to a support plate (10), the left and right ends of the support plate (10) are fixedly connected to a cylinder (11), the driving end of the cylinder (11) is fixedly connected to the top side of the strip plate (12), and the left and right ends of the bottom side of the processing assembly are fixedly connected to a pressing plate (21).

3. A circuit board SMT processing screen printing jig according to claim 2, characterized in that: The left and right ends of the pressure plate (21) are fixedly connected to fixed blocks (22), a rotating assembly is arranged inside the fixed block (22), a turning handle (25) is fixedly connected to the top side of the rotating assembly, the bottom ends of the adjacent sides of the two fixed blocks (22) are fixedly connected to bottom blocks (44), the top side of the bottom block (44) is fixedly connected to a connecting block (26), the outside of the connecting block (26) is slidably connected to a connecting block (27), and the adjacent sides of the two connecting blocks (27) are fixedly connected to a jig plate (28).

4. A circuit board SMT processing screen printing jig according to claim 1, characterized in that: A protective box (29) is fixedly connected to the right end of the rear side of the processing table (2), and a driving assembly is fixedly connected to the rear side of the inner wall of the protective box (29). Wheels (31) are fixedly connected to the front and rear ends of the driving assembly, and belts (32) are sleeved on the outside of each of the two wheels (31). A driving wheel (33) is fixedly connected to the rear end of the driving assembly, and two semicircular blocks (34) are fixedly connected to the front side of the driving wheel (33), wherein the interiors of the two vertical plates (3) are slidably connected to sliding shafts (36). A fixed detector (37) is provided in the middle of the processing table (2), a disc (38) is fixedly connected to the rear end of the sliding shaft (36), and springs (39) are fixedly connected to the front and rear sides of the disc (38), a force plate (40) is fixedly connected to the bottom side of the rear end of the sliding shaft (36), a cleaning assembly is fixedly connected to the middle of the sliding shaft (36), and a plurality of brushes (43) are fixedly connected to the bottom side of the cleaning assembly.

5. The circuit board SMT processing screen printing jig according to claim 1, characterized in that: The two reset assemblies each comprise a fixing rod (13), the outside of the fixing rod (13) being fixedly connected to the inner wall of the top end of the strip plate (12), and the outside of the fixing rod (13) being sleeved with a spring 1 (14).

6. A circuit board SMT processing screen printing jig according to claim 5, characterized in that: The adjacent sides of the plurality of square blocks (15) are respectively fixedly connected to the distant sides of the two springs (14), and the outer sides of the plurality of connecting rods (16) are respectively slidably connected to the inner walls of the two brush plates (18).

7. A circuit board SMT processing screen printing jig according to claim 3, characterized in that: The two rotating assemblies each comprise a threaded rod (23), the outer thread of the threaded rod (23) being connected to the inner wall of the fixed block (22), the top of the threaded rod (23) being fixedly connected to a circular plate (24), the outer parts of the two circular plates (24) being rotatably connected to the inner walls of the left and right ends of the pressure plate (21), respectively, and the bottom side of the connecting block (27) being in contact with the top side of the bottom block (44).

8. The circuit board SMT processing screen printing jig according to claim 4, characterized in that: The inner wall of the fixed detector (37) is fixedly connected with a solenoid valve (45), a reversing valve (46) is arranged on the rear side of the solenoid valve (45), and a vacuum breaking valve (47) is arranged on the left side of the solenoid valve (45).

9. A circuit board SMT processing screen printing jig according to claim 4, characterized in that: The driving assembly comprises a motor (35), the rear side of the motor (35) is fixedly connected to the rear side of the inner wall of the protection box (29), and the driving end of the motor (35) is fixedly connected to a rotating shaft (30).

10. The circuit board SMT processing screen printing jig according to claim 4, characterized in that: The cleaning assembly comprises a fixed box (41), the inner wall of the fixed box (41) is fixedly connected to the middle outer wall of the sliding shaft (36), and the bottom side of the fixed box (41) is fixedly connected to a cleaning plate (42).

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