A cover plate pretreatment device for circuit board processing

Abstract

The present invention belongs to the technical field of integrated circuit manufacturing, and is particularly directed to a cover plate pretreatment device for circuit board processing. In order to overcome the disadvantage that clean water escapes to the surface of the circuit board after cleaning, affecting the cleaning efficiency of the circuit board. It includes a conveyor frame installed in a box body, a sprayer is installed in the box body, and the sprayer is installed with a plurality of spray heads. The conveyor frame is rotatably connected to a plurality of electrically controlled rotating rollers, and all the electrically controlled rotating rollers located below the sprayer are frustum-shaped, and the spray heads gradually tilt from top to bottom toward the minimum diameter portion of the electrically controlled rotating rollers. The present invention controls the direction of water flow on the surface of the circuit board by tilting the circuit board, and the clean water sprayed from the spray head flows along the inclined surface of the circuit board, thereby controlling the diffusion direction of the clean water on the surface of the circuit board, reducing the probability of the clean water carrying impurities and flowing to the cleaned part of the circuit board, and thus improving the cleaning effect of the circuit board.

Description

Technical Field

[0001] The present invention belongs to the technical field of integrated circuit manufacturing, and in particular relates to a cover plate pretreatment device for circuit board processing. Background Art

[0002] During the manufacturing process of printed circuit boards (PCBs), in order to ensure the processing effect of the circuit boards, the circuit boards need to be pre-treated, which includes pre-cleaning the circuit boards to ensure the quality of subsequent pattern transfer of the circuit boards. Traditional pre-treatment equipment generally uses horizontal conveyor rollers combined with spray cleaning, that is, by directly spraying clean water onto the surface of the circuit boards to clean the surface of the circuit boards. In this clean water spraying method, when the clean water contacts the surface of the circuit boards, the clean water will carry impurities on the surface of the circuit boards and flow around. Since the surface of the circuit boards is relatively flat and smooth, the clean water will diffuse disorderly on the board surface, causing the water flow to carry impurities back to the cleaned area, resulting in secondary contamination of the cleaned areas, thereby affecting the cleaning effect of the circuit boards. Summary of the Invention

[0003] In order to overcome the disadvantage that cleaning water escapes to the cleaned surface of the circuit board and affects the cleaning effect of the circuit board, the present invention provides a cover plate pretreatment device for circuit board processing.

[0004] The technical solution of the present invention is: a cover plate pretreatment device for circuit board processing, including a conveyor frame installed on a box body, a sprayer installed in the box body, and a plurality of spray heads distributed in a straight line installed on the sprayer. The conveyor frame is rotatably connected to a plurality of electrically controlled rotating rollers distributed at intervals. All the electrically controlled rotating rollers located below the sprayer are frustum-shaped, and the spray heads are gradually inclined from top to bottom toward the minimum diameter portion of the electrically controlled rotating rollers.

[0005] Preferably, the minimum diameters of all the frustum-shaped electrically controlled rotating rollers decrease sequentially from both sides to the middle.

[0006] Preferably, a motor is installed in the box, and the output shaft of the motor is fixedly connected to a first pulley rotatably connected to the box, and a second pulley is rotatably connected inside the box. The first pulley and the second pulley are jointly wound with two symmetrically distributed connecting belts, and the two connecting belts are jointly rotatably connected to several rotating shafts distributed at intervals, and the rotating shafts are provided with flexible shafts.

[0007] Preferably, a gear is fixedly connected to the rotating shaft, and a rack is fixedly connected to the box body, and the rack is used to sequentially transmit all the gears to rotate.

[0008] Preferably, a limiting frame is fixedly connected in the box body, and the limiting frame is used to squeeze all the flexible shafts in sequence, and the rotating shaft is slidably connected to the adjacent flexible shafts.

[0009] Preferably, the sprayer is located between the minimum diameter of the truncated cone-shaped electrically controlled rotating roller and the limiting frame.

[0010] Preferably, the limiting frame is provided with a plurality of flexible bristles, and the limiting frame is fixedly connected with a half-toothed ring, and the half-toothed ring is used to sequentially transmit all the gears to rotate the gears.

[0011] Preferably, the box is equipped with two symmetrically distributed electric push rods, the telescopic parts of the electric push rods are fixedly connected with extrusion frames, the two extrusion frames are respectively located on both sides of the adjacent flexible shafts, and the two extrusion frames are used to extrude all the flexible shafts in sequence.

[0012] Preferably, the extrusion frame is provided with a guide surface for guiding all the flexible shafts in sequence.

[0013] Preferably, two symmetrically distributed extrusion rings are fixedly connected in the flexible shaft, and a plurality of circumferentially distributed elastic strips are fixedly connected between the two extrusion rings.

[0014] Compared with the existing similar technologies, the present invention has at least the following advantages: the present invention tilts the circuit board, and the cleaning water sprayed from the sprinkler head flows along the inclined surface of the circuit board, thereby controlling the water flow direction on the circuit board surface, thereby controlling the diffusion direction of the cleaning water on the circuit board surface, reducing the probability of the cleaning water carrying impurities and flowing to the cleaned part of the circuit board, thereby improving the cleaning effect of the circuit board, and wiping the surface of the circuit board in one direction through the flexible shaft, while wiping the stubborn impurities on the surface of the circuit board, promoting the unidirectional flow of the cleaning water on the surface of the circuit board, adopting the method of wiping the glass lens, reducing the impurities remaining on the surface of the circuit board after wiping, and improving The invention has a high circuit board cleaning effect. The limit frame is used to squeeze the flexible shaft so that the clean water adsorbed in the flexible shaft is discharged into the collection box of the box along with impurities, and the fine impurities attached to the flexible shaft during the rotation are brushed off by the flexible brush bristles to reduce the amount of impurities attached to the flexible shaft and improve the subsequent cleaning effect of the flexible shaft on the circuit board. At the same time, the clean water in the flexible shaft is evenly squeezed out and sprayed into the through-holes on the circuit board. The clean water in the flexible shaft evenly flushes all the through-holes on the circuit board and cleans the through-holes of the circuit board to reduce the amount of impurities accumulated in the through-holes of the circuit board, thereby improving the cleaning efficiency of the circuit board by this device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0016] Figure 2 It is a three-dimensional structural sectional view of the box body of the present invention;

[0017] Figure 3Schematic diagram of the three-dimensional structure of the electrically controlled rotating roller of the present invention;

[0018] Figure 4 A schematic diagram of the three-dimensional structure of the first pulley and the second pulley of the present invention;

[0019] Figure 5 Schematic diagram of the three-dimensional structure of the sprinkler and the sprinkler head of the present invention;

[0020] Figure 6 Schematic diagram of the three-dimensional structure of the flexible shaft of the present invention;

[0021] Figure 7 Schematic diagram of the three-dimensional structure of the limiting frame of the present invention;

[0022] Figure 8 It is a schematic diagram of the three-dimensional structure of the extrusion frame of the present invention;

[0023] Figure 9 Schematic diagram of the three-dimensional structure of the extrusion ring of the present invention;

[0024] Figure 10 It is a schematic diagram of the three-dimensional structure of the elastic strip of the present invention.

[0025] In the accompanying drawings: 1-box, 2-conveyor frame, 3-sprayer, 301-spray head, 4-electrically controlled rotating roller, 5-motor, 6-first pulley, 7-second pulley, 8-connecting belt, 9-rotating shaft, 901-flexible shaft, 10-gear, 11-rack, 12-limiting frame, 13-flexible bristles, 14-semi-tooth ring, 15-electric push rod, 16-extrusion frame, 1601-guide surface, 17-extrusion ring, 18-elastic strip. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0027] Example 1: When cleaning existing circuit boards, they are placed horizontally. Cleaning water will diffuse disorderly on the board surface, causing the cleaning water to carry impurities back to the cleaned area, thereby causing secondary contamination of the circuit board surface and affecting the cleaning effect of the circuit board.

[0028] A circuit board pretreatment device for processing a circuit board, such as Figure 1-Figure 5As shown, it includes a conveyor frame 2 installed in the box body 1, a control terminal is installed on the left side of the box body 1, a collection box is provided at the lower part of the box body 1, a drying device not shown in the figure and electrically connected to the control terminal is installed on the right side of the box body 1, and the drying device is used to dry the cleaned circuit board, a sprayer 3 electrically connected to the control terminal is installed in the box body 1, and the sprayer 3 is equipped with a plurality of spray heads 301 distributed in a straight line on the left and right sides, and the conveyor frame 2 is rotatably connected to a plurality of electrically controlled rotating rollers 4 distributed at intervals on the left and right sides, and all electrically controlled rotating rollers 4 are electrically connected to the control terminal. Figure 1 The main view is the reference for the direction of rotation. The electrically controlled rotating roller 4 rotates clockwise to transport the circuit board to the right. All electrically controlled rotating rollers 4 located below the sprayer 3 are frustum-shaped. The diameter of the frustum-shaped electrically controlled rotating roller 4 gradually decreases from front to back. The spray head 301 gradually tilts toward the rear from top to bottom, causing the rear of the circuit board on the frustum-shaped electrically controlled rotating roller 4 to tilt downward. The circuit board is transported from left to right, and the spray head 301 sprays clean water toward the rear and downward, causing the clean water to flow toward the rear and downward along the upper surface of the circuit board. The diameter of the rear end of all frustum-shaped electrically controlled rotating rollers 4 decreases successively from both sides to the middle.

[0029] like Figure 4 and Figure 6 As shown, a motor 5 electrically connected to the control terminal is installed in the box body 1, and the output shaft of the motor 5 is fixedly connected to a first pulley 6 rotatably connected to the box body 1. A second pulley 7 is rotatably connected in the box body 1. The first pulley 6 and the second pulley 7 are jointly wound with two connecting belts 8 symmetrically distributed on the left and right. The axis height of the first pulley 6 is lower than the axis height of the second pulley 7, so that the two connecting belts 8 are tilted downward from front to back to adapt to the diameter change of the frustum-shaped electrically controlled rotating roller 4. The two connecting belts 8 are rotatably connected together with several rotating shafts 9 distributed at intervals. The rotating shaft 9 is provided with a flexible shaft 901. In this embodiment, the rotating shaft 9 is fixed to the flexible shaft 901. The flexible shaft 901 has the characteristics of high water absorption, and the flexible shaft 901 can be made of a cleaning sponge.

[0030] like Figure 6 and Figure 8 As shown, the rotating shaft 9 is fixed with a gear 10, and a rack 11 is fixed to a position near the lower part of the connecting belt 8 in the box body 1. In the process of the first pulley 6 and the second pulley 7 jointly driving the two connecting belts 8 to rotate, the two connecting belts 8 drive all the rotating shafts 9 to move, and the rotating shafts 9 drive the adjacent gears 10 to move. After all the gears 10 move to the lower part of the connecting belt 8 in turn, all the gears 10 engage with the rack 11 in turn. As the gears 10 move, the rack 11 drives all the gears 10 in turn to rotate.

[0031] The specific working principle is as follows:

[0032] When the present device is required to pre-treat a circuit board, the operator places the circuit board on the electrically controlled rotating roller 4 on the left side of the conveyor frame 2, and then activates the electrically controlled rotating roller 4 through the control terminal. The electrically controlled rotating roller 4 rotates clockwise, causing the circuit board to move to the right into the box 1. After the circuit board moves onto the frustum-shaped electrically controlled rotating roller 4, since the diameter of the frustum-shaped electrically controlled rotating roller 4 gradually decreases from front to back, the rear portion of the circuit board gradually tilts downward during movement. The operator activates the sprayers 3 through the control terminal, and all the spray heads 301 spray clean water onto the surface of the circuit board. By tilting the circuit board and allowing the clean water sprayed from the spray heads 301 to flow along the inclined surface of the circuit board, the direction of the water flow on the surface of the circuit board is controlled, thereby controlling the diffusion direction of the clean water on the surface of the circuit board, reducing the probability of the clean water carrying impurities and flowing to the cleaned portion of the circuit board (i.e., after the front side of the circuit board is cleaned, the water flows backward, reducing the probability of impurities in the clean water contacting the front side of the circuit board), thereby improving the cleaning efficiency of the circuit board.

[0033] When the circuit board moves onto the truncated cone-shaped electrically controlled rotating roller 4, the operator turns on the motor 5 through the control terminal, and the output shaft of the motor 5 drives the first pulley 6 to rotate clockwise (with Figure 1 The left view is the reference for the rotation direction), the first pulley 6 drives the two connecting belts 8 to move, the two connecting belts 8 drive the second pulley 7 to rotate, the two connecting belts 8 together drive all the rotating shafts 9 to move (the rotating shafts 9 drive the gears 10 to move during the movement), and the rotating shafts 9 drive the flexible shaft 901 to move.

[0034] When the flexible shaft 901 moves to the lower part of the two connecting belts 8, the gear 10 moves to mesh with the rack 11, and the shaft 9 drives the gear 10 to move. The gear 10 moves along the rack 11, causing the gear 10 to rotate during the movement, and the gear 10 drives the shaft 9 to rotate, and the shaft 9 drives the flexible shaft 901 to rotate (with Figure 1 The left view is the reference of the rotation direction. The gear 10, the rotating shaft 9 and the flexible shaft 901 rotate clockwise. The flexible shaft 901 pushes the clean water on the surface of the circuit board and the impurities in the water backward, so that the flexible shaft 901 rotates during the movement, so that all the flexible shafts 901 that move to the bottom wipe the surface of the circuit board in one direction in turn. By wiping the surface of the circuit board in one direction, while erasing stubborn impurities on the surface of the circuit board, the clean water on the surface of the circuit board is pushed to flow in one direction. The method of wiping the glass lens is adopted to reduce the impurities remaining on the surface of the circuit board after wiping, thereby improving the cleaning effect of the circuit board.

[0035] When the circuit boards are cleaned and the operator needs to stop using the device, the operator collects the cleaned circuit boards and turns off the sprayer 3, the electrically controlled rotating roller 4 and the motor 5 through the control terminal.

[0036] Example 2: When cleaning a circuit board, the existing cleaning device will wipe the cleaning water on the surface of the circuit board. However, after the existing wiping structure absorbs the sewage, it will cause fine impurities to adhere to the wiping structure. Over time, the accumulation of impurities will cause the wiping structure to scratch the circuit board or cause pollution during use, affecting the cleaning effect of the circuit board.

[0037] On the basis of Example 1, Figure 3 、 Figure 6 and Figure 7 As shown, a limiting frame 12 is fixedly connected to the box body 1, and the lower part of the limiting frame 12 is an arc-shaped part. The distance between the arc-shaped part on the limiting frame 12 and the axis of the second pulley 7 gradually decreases from the upper and lower sides to the middle thereof. When all the flexible shafts 901 are moved in turn to fit with the limiting frame 12, the limiting frame 12 squeezes all the flexible shafts 901 in turn. In the above embodiment, the rotating shaft 9 is fixedly connected to the flexible shaft 901. In this embodiment, the rotating shaft 9 is slidingly connected to the adjacent flexible shaft 901. The clean water in the flexible shaft 901 is squeezed out and flows into the collection box at the lower part of the box body 1. The sprayer 3 is located between the left part of the truncated cone-shaped electrically controlled rotating roller 4 and the limiting frame 12.

[0038] like Figure 7 As shown, the limit frame 12 is provided with a plurality of flexible bristles 13, which are used to brush away impurities on the surface of the flexible shaft 901. The limit frame 12 is fixed with a half-toothed ring 14. When all the gears 10 pass through the half-toothed ring 14 in sequence, all the gears 10 engage with the half-toothed ring 14 in sequence, and the half-toothed ring 14 transmits all the gears 10 in sequence to make the gears 10 rotate.

[0039] The specific working principle is as follows:

[0040] When the flexible shaft 901 moves to fit with the limit frame 12, as the flexible shaft 901 moves, the distance between the arc-shaped portion on the limit frame 12 and the axis of the second pulley 7 gradually decreases from the upper and lower sides to the middle thereof, so the flexible shaft 901 is gradually squeezed by the limit frame 12, and the clean water absorbed in the flexible shaft 901 is squeezed out by the limit frame 12 (when the flexible shaft 901 fits the surface of the circuit board, the flexible shaft 901 will absorb the clean water on the surface of the circuit board and the fine impurities in the water), the clean water adsorbed in the flexible shaft 901 is discharged into the collection box of the box body 1 along with the impurities, and the flexible shaft 901 is cleaned to reduce the amount of impurities attached to the flexible shaft 901 and improve the subsequent cleaning effect of the flexible shaft 901 on the circuit board.

[0041] When the flexible shaft 901 moves to fit with the limit frame 12, the gear 10 moves to engage with the half-toothed ring 14. As the gear 10 moves, the gear 10 moves along the half-toothed ring 14, causing the gear 10 to rotate. The gear 10 drives the rotating shaft 9 to rotate, causing the flexible shaft 901 to rotate relative to all the flexible bristles 13. The surface of the flexible shaft 901 is cleaned by the flexible bristles 13. The flexible bristles 13 brush off the fine impurities attached to the flexible shaft 901 during the rotation process, so as to reduce the amount of impurities attached to the flexible shaft 901 and improve the subsequent cleaning effect of the flexible shaft 901 on the circuit board.

[0042] Example 3: There are a large number of microporous structures such as through holes and mounting holes on existing circuit boards. Etching dust, oil stains and other impurities are easily left in the through holes. The impurities in the through holes are difficult to remove, which affects the cleaning effect of the circuit board.

[0043] On the basis of Example 2, Figure 8 and Figure 9 As shown, the box 1 is equipped with two electric push rods 15 symmetrically distributed on the left and right. The two electric push rods 15 are electrically connected to the control terminal. The telescopic part of the electric push rod 15 is fixed with an extrusion frame 16. The two extrusion frames 16 are respectively located on the left and right sides of the adjacent flexible shaft 901. Initially, the flexible shaft 901 located at the lower part is in contact with the two extrusion frames 16. The telescopic part of the electric push rod 15 is used to drive the adjacent extrusion frames 16 to move back and forth, so that the two extrusion frames 16 move toward each other or back to back. In the process of the two extrusion frames 16 moving toward each other, the two extrusion frames 16 exert pressure on the adjacent flexible shafts 901. The shaft 901 is extruded, and the two extrusion frames 16 extrude all the flexible shafts 901 in turn during the reciprocating movement. The extrusion frame 16 is provided with a guide surface 1601. The distance between the two guide surfaces 1601 gradually increases from back to front. The maximum distance between the two guide surfaces 1601 is equal to the distance between the middle parts of the two extrusion frames 16. The guide surface 1601 is used to guide all the flexible shafts 901 in turn. In the process of the two extrusion frames 16 moving toward each other, the flexible shaft 901 can enter between the two extrusion frames 16 along the guide surface 1601.

[0044] like Figure 9 and Figure 10 As shown, two extrusion rings 17 symmetrically distributed on the left and right are fixed to the flexible shaft 901. When the two extrusion frames 16 jointly extrude the adjacent flexible shafts 901, the two extrusion rings 17 move toward each other. A number of circumferentially distributed elastic strips 18 are fixed between the two extrusion rings 17. When the two extrusion rings 17 move toward each other, the two extrusion rings 17 squeeze the adjacent elastic strips 18. The elastic strips 18 are wavy and embedded in the adjacent flexible shafts 901. When under pressure, the elastic strips 18 are uniformly deformed at all locations. The elastic strips 18 deform and extrude the adjacent flexible shafts 901.

[0045] The specific working principle is as follows:

[0046] When the flexible shaft 901 moves to contact the guide surface 1601, as the flexible shaft 901 moves, the flexible shaft 901 moves between the two extrusion racks 16, and the operator turns on the two electric push rods 15 through the control terminal. The telescopic parts of the two electric push rods 15 drive the adjacent extrusion racks 16 to move back and forth respectively. The two extrusion racks 16 first move towards each other, and the two extrusion racks 16 jointly squeeze the adjacent flexible shafts 901 to squeeze out the clean water adsorbed in the flexible shaft 901. The clean water in the flexible shaft 901 is squeezed out and sprayed into the through-holes on the circuit board (the surface of the circuit board will be provided with several through-holes for connecting electronic components, connecting circuits and installation). The clean water in the flexible shaft 901 is squeezed out and flushes the through-holes of the circuit board to clean the through-holes of the circuit board, so as to reduce the amount of impurities accumulated in the through-holes of the circuit board, thereby improving the cleaning efficiency of the circuit board by this device.

[0047] When the two extrusion racks 16 move toward each other to the limit state, the two extrusion racks 16 move back to back, and the squeezed flexible shaft 901 rebounds and resets and continues to absorb the clean water on the surface of the circuit board and the fine impurities in the water. The above steps are repeated, and the flexible shaft 901 is continuously squeezed. The clean water in the flexible shaft 901 is squeezed out and the through holes on the circuit board are cleaned.

[0048] During the process of the two extrusion frames 16 moving toward each other, the extrusion frames 16 push the extrusion ring 17 through the flexible shaft 901. During the deformation of the flexible shaft 901, the two extrusion rings 17 move toward each other, and the two extrusion rings 17 jointly squeeze the circumferentially distributed elastic strips 18, so that the circumferentially distributed elastic strips 18 are uniformly deformed. The elastic strips 18 are deformed and squeeze the adjacent flexible shafts 901. The flexible shafts 901 are uniformly deformed at all locations, so that the flexible shafts 901 spray water uniformly when under pressure, so as to ensure the uniformity of the clean water entering the through holes at various locations on the circuit board, thereby ensuring that the through holes at various locations on the circuit board can be circulated by clean water, reducing the probability of through holes on the circuit board being missed due to uneven spraying of clean water, and improving the effect of cleaning the through holes at various locations on the circuit board.

[0049] When the circuit boards are cleaned and the operator needs to stop using the device, the operator collects the cleaned circuit boards and turns off the sprayer 3, the electrically controlled rotating roller 4, the motor 5 and the electric push rod 15 through the control terminal.

[0050] The above is merely an example of the present invention and is not intended to limit the present invention. Any equivalent substitutions made within the principles of the present invention should be included within the scope of protection of the present invention. Any content not elaborated in detail in the present invention belongs to the prior art known to those skilled in the art.

Claims

1. A cover plate pretreatment device for circuit board processing, comprising a conveyor frame (2) installed on a box (1), a sprayer (3) installed in the box (1), the sprayer (3) being equipped with a plurality of spray heads (301) distributed in a straight line, the conveyor frame (2) being rotatably connected to a plurality of electrically controlled rotating rollers (4) distributed at intervals, characterized in that: All the electrically controlled rotating rollers (4) located below the sprayer (3) are truncated cone-shaped. The electrically controlled rotating rollers (4) rotate clockwise to move the circuit board to the right into the box (1). When the circuit board moves onto the truncated cone-shaped electrically controlled rotating rollers (4), since the diameter of the truncated cone-shaped electrically controlled rotating rollers (4) gradually decreases from front to back, the rear portion of the circuit board gradually tilts downward during the movement. The minimum diameters of all the truncated cone-shaped electrically controlled rotating rollers (4) decrease from both sides to the middle. The spray head (301) gradually tilts from top to bottom toward the minimum diameter portion of the electrically controlled rotating rollers (4), so that after the circuit board moves to the electrically controlled rotating rollers (4) located below the sprayer (3), the circuit board is tilted. The clean water sprayed by the spray head (301) flows along the tilted surface of the circuit board to control the diffusion direction of the water flow on the surface of the circuit board and reduce the probability of the clean water carrying impurities flowing back to the cleaned area.

2. A cover plate pretreatment device for circuit board processing according to claim 1, characterized in that: A motor (5) is installed in the box (1); the output shaft of the motor (5) is fixedly connected to a first pulley (6) rotatably connected to the box (1); a second pulley (7) is rotatably connected in the box (1); the first pulley (6) and the second pulley (7) are jointly wound with two symmetrically distributed connecting belts (8); the two connecting belts (8) are jointly rotatably connected to a plurality of rotating shafts (9) distributed at intervals; the rotating shafts (9) are provided with flexible shafts (901).

3. A cover plate pretreatment device for circuit board processing according to claim 2, characterized in that: The rotating shaft (9) is fixedly connected to a gear (10), and a rack (11) is fixedly connected inside the box (1). The rack (11) is used to sequentially transmit all the gears (10) to rotate the gears (10).

4. A cover plate pretreatment device for circuit board processing according to claim 3, characterized in that: A limiting frame (12) is fixedly connected inside the box body (1), and the limiting frame (12) is used to sequentially squeeze all the flexible shafts (901), and the rotating shaft (9) is slidably connected to adjacent flexible shafts (901).

5. A cover plate pretreatment device for circuit board processing according to claim 4, characterized in that: The sprayer (3) is located between the minimum diameter of the truncated cone-shaped electrically controlled rotating roller (4) and the limiting frame (12).

6. A cover plate pretreatment device for circuit board processing according to claim 5, characterized in that: The limiting frame (12) is provided with a plurality of flexible bristles (13), and the limiting frame (12) is fixedly connected with a half-toothed ring (14), and the half-toothed ring (14) is used to sequentially transmit all the gears (10) to rotate the gears (10).

7. A cover plate pretreatment device for circuit board processing according to claim 2, characterized in that: The box (1) is equipped with two symmetrically distributed electric push rods (15), the telescopic parts of the electric push rods (15) are fixedly connected to extrusion frames (16), the two extrusion frames (16) are respectively located on both sides of adjacent flexible shafts (901), and the two extrusion frames (16) are used to sequentially extrude all the flexible shafts (901).

8. A cover plate pretreatment device for circuit board processing according to claim 7, characterized in that: The extrusion frame (16) is provided with a guide surface (1601) for guiding all the flexible shafts (901) in sequence.

9. A cover plate pretreatment device for circuit board processing according to claim 8, characterized in that: Two symmetrically distributed extrusion rings (17) are fixedly connected inside the flexible shaft (901), and a plurality of circumferentially distributed elastic strips (18) are fixedly connected between the two extrusion rings (17).

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