Combined multi-brush grinding device for grinding PCB (Printed Circuit Board)

Abstract

The invention discloses a combined multi-brush grinding device for grinding a PCB (Printed Circuit Board), and relates to the technical field of PCBs. The device comprises an outer wrapping shell, a grinding brush roller is fixedly connected to the inner side face of the outer wrapping shell, and two notches are formed in the two sides of the outer wrapping shell. Through the arrangement of the pressing rod, the discharging inclined plate and other assemblies in the pressing protection device, the pressing rod conducts vertical reciprocating displacement, when the pressing rod moves to the top of a PCB, the pressing rod is pressed and fixed during work, and meanwhile, when the pressing rod moves upwards, after grinding is completed, the pressing rod is pressed and fixed to the top of the PCB. When the discharging inclined plate rotates anticlockwise to be close to the bottom of the conveying belt, the PCB falls onto the discharging inclined plate from the conveying belt through the other notch at the moment, the initial gravitational acceleration time when the PCB falls onto the discharging inclined plate is shortened in the pressing and fixing state and the discharging state in the working state, the gravity of the PCB falling onto the discharging inclined plate is reduced, and the working efficiency is improved. And the PCB is prevented from being damaged in the blanking process.

Description

Technical Field

[0001] The invention relates to the technical field of PCB boards, and in particular to a combined multi-brush grinding device for grinding PCB boards. Background Art

[0002] PCB board, translated into Chinese as printed circuit board, also known as printed circuit board, printed circuit board, is an important electronic component, a support for electronic components, and a provider of electrical connections for electronic components. Because it is made using electronic printing technology, it is called a "printed" circuit board.

[0003] According to a disclosed multi-brush grinding device for grinding PCB boards (publication number: CN 115256216A), it includes a fixed frame, a conveying assembly with an input roller group and an output roller group, and at least four groups of grinding assemblies installed in parallel on the fixed frame and located between the input roller group and the output roller group; wherein the grinding assembly includes a grinding wheel and a parallel wheel arranged in parallel, and the grinding wheel is used to grind the upper surface or the lower surface of the PCB board; and also includes a swing assembly installed on the fixed frame and connected to one end of the grinding wheel. The multi-brush grinding device has a reasonable structural design and a high degree of automation. The upper and lower surfaces of the PCB board are ground multiple times by at least four groups of grinding assemblies, so that the grinding surface of the PCB board is more uniform, and the uneven grinding spacing adjusted manually affects the appearance quality of the PCB board, and the same PCB board is prevented from needing multiple grinding operations, thereby reducing the grinding process flow, reducing production costs, and improving production efficiency.

[0004] However, in the above application, it is difficult to fix and press the PCB board during the grinding process through the cooperation of the conveying components of the input roller group and the output roller group, resulting in that the PCB board is difficult to fix during the grinding process, resulting in poor effect. At the same time, there is a lack of protective components to protect the PCB board during the discharge process after the grinding process, which can easily cause damage accidents during the discharge of the PCB board, resulting in property losses. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a combined multi-brush grinding device for grinding PCB boards, which solves the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a combined multi-brush grinding device for grinding PCB boards, comprising an outer shell, a grinding brush roller is fixedly connected to the inner side of the outer shell, two notches are provided on both sides of the outer shell, a conveyor belt is passed through the two notches, a material unloading support plate is fixedly connected to the side of the outer shell, and a pressing protection device is provided on the side of the outer shell;

[0007] The clamping protection device includes a fixing plate, the side surface of the fixing plate is fixedly connected to the side surface of the outer shell, the bottom of the fixing plate is fixedly connected to a three-phase asynchronous motor, the output shaft of the three-phase asynchronous motor is fixedly connected to a reciprocating screw, the circumferential surface of the reciprocating screw is threadedly connected to a threaded sleeve, the circumferential surface of the threaded sleeve is fixedly connected to a clamping rod, the side surface of the threaded sleeve is fixedly connected to a limiting rod, the side surface of the limiting rod is fixedly connected to a rack rod, a large gear passes through the side surface of the outer shell, the front side surface of the outer shell is slidably connected to a rack plate, the side surface of the rack plate is fixedly connected to an extrusion rod, the inner side surfaces of the two blanking support plates are rotatably connected to an adjusting shaft, and the circumferential surface of the adjusting shaft is fixedly connected to a force block and a blanking inclined plate.

[0008] According to the above technical solution, one end of the limit rod is slidably connected to the side of the outer shell, the side of the rack rod is meshed with one side of the large gear, and the other side of the large gear is meshed with one side of the rack plate. One end of the limit rod is slidably connected to the side of the outer shell to limit the displacement of the threaded sleeve, thereby enhancing the stability of the device during operation.

[0009] According to the above technical solution, a connecting rod is fixedly connected to the side of the outer shell, one end of the connecting rod is meshed with one end of the large gear, and the top of the force block is located on the displacement track of the extrusion rod. Such a design is conducive to ensuring the stability of the operation of the device.

[0010] According to the above technical solution, a detection device is provided on the front side of the outer shell, and the detection device includes an L-shaped arc groove, one end of which is opened on the front side of the outer shell, and the inside of the L-shaped arc groove is slidably connected with an adapting L-shaped arc plate, and the side of the adapting L-shaped arc plate is fixedly connected with a detection plate, and the side of the detection plate is provided with a scale, and the side of the detection plate is slidably connected with a scale rod, and the side of the rack plate is fixedly connected with a pressure rod. The design of the detection device is mainly to perform regional thickness detection on the top of the PCB board after grinding, to prevent the tool on the grinding brush roller from being damaged due to long-term use, resulting in uneven thickness of a certain PCB board during grinding, strengthen quality inspection supervision, and improve product quality.

[0011] According to the above technical solution, a spring fixing plate is fixedly connected inside the L-shaped arc groove, a reset spring is fixedly connected to the bottom of the spring fixing plate, and one end of the reset spring is fixedly connected to one end of the matching L-shaped arc plate. The function of the reset spring is mainly to automatically reset the matching L-shaped arc plate when it is not subjected to the squeezing force of the pressure rod through its elasticity.

[0012] According to the above technical solution, the top of the adapting L-shaped arc plate is located on the displacement track of the pressure rod, and the bottom of the scale rod is located directly above the conveyor belt. The top of the adapting L-shaped arc plate is located on the displacement track of the pressure rod, so that the pressure rod can better drive the adapting L-shaped arc plate to move during the displacement process.

[0013] According to the above technical solution, an intermittent soot blowing assembly is provided on the inner side of the outer shell, and the intermittent soot blowing assembly includes an air pressure pump, one end of which is penetrated by a booster piston block, and the other end of which is fixedly penetrated by an air pressure extension pipe, and one end of which is fixedly connected to an air outlet pipe. The function of the intermittent soot blowing assembly is mainly to remove the residues generated during the grinding process through the internal air pressure of the air pressure pump and the upward extrusion force of the rack rod, through the convergence of the clamping rod and the blowing force at one end of the air outlet pipe.

[0014] According to the above technical solution, one end of the air pump is connected to one end of the air outlet pipe through the inside of the air pressure extension pipe, and the bottom of the booster piston block is located on the displacement track of the rack rod. The bottom of the booster piston block is located on the displacement track of the rack rod, so that the rack rod can more accurately squeeze the bottom of the booster piston block during the displacement process, and then the gas inside the air pump is conducted to one end of the air outlet pipe through the air pressure extension pipe for discharge.

[0015] According to the above technical solution, a tension spring is fixedly sleeved on the outer surface of the boosting piston block, and one end of the tension spring is fixedly connected to the end of the air pump close to the boosting piston block. The design of the tension spring mainly utilizes elasticity to intermittently bounce the boosting piston block, thereby adapting to the work of the compression protection device and performing coordinated work.

[0016] According to the above technical solution, a dust box is fixedly connected to the side of the conveyor belt, one end of the air outlet pipe is located obliquely below the clamping rod, and the dust box and the air outlet pipe are located on the same vertical horizontal line. The dust box is designed mainly to collect dust that falls when the air outlet pipe exhausts. One end of the air outlet pipe is located obliquely below the clamping rod, so as to better remove the dust remaining in the grinding that is blocked by the side of the clamping rod when the clamping rod presses down to clamp the top of the PCB board.

[0017] The present invention provides a combined multi-brush grinding device for grinding PCB boards. It has the following beneficial effects:

[0018] (1) The present invention arranges the clamping rod, the unloading inclined plate and other components inside the clamping protection device so that the clamping rod can move back and forth vertically. When the clamping rod moves to the top of the PCB board, it clamps and fixes it during operation. At the same time, when the clamping rod moves upward, after grinding is completed, the unloading inclined plate rotates counterclockwise to be close to the bottom of the conveyor belt. At this time, the PCB board falls from the conveyor belt to the unloading inclined plate through another notch, achieving clamping and fixing in the working state and shortening the initial gravity acceleration time of the PCB board falling onto the unloading inclined plate in the unloading state, reducing the gravity of the PCB board falling onto the unloading inclined plate, and avoiding damage to the PCB board during the unloading process.

[0019] (2) The present invention sets the adaptable L-shaped arc plate, the detection plate and other components inside the compression protection device, so that when the detection plate moves downward in the arc, the scale rod sliding on the side thereof contacts the top of the PCB board; during the horizontal displacement process, the bottom end of the scale rod will detect whether the top of the PCB board is uneven. If it is uneven, the bottom end of the scale rod will move downward and upward, thereby achieving regional detection of the thickness of the top of the PCB board after grinding, preventing the tool on the grinding brush roller from being damaged due to long-term use, resulting in uneven thickness of a certain PCB board during grinding, strengthening quality inspection supervision, and improving product quality.

[0020] (3) The present invention increases the air pressure inside the air pump by disposing components such as a booster piston block and an air pressure extension pipe inside an intermittent soot blowing component, and transmits the compressed gas to the inside of the air outlet pipe through the air pressure extension pipe. The air outlet pipe exhausts gas, and when the clamping rod is pressed against the top of the PCB board, the grinding debris blocked by the side is blown into the ash box for chip removal, thereby achieving the effect of removing the residue generated during the grinding process through the convergence of the clamping rod and the blowing force at one end of the air outlet pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall three-dimensional appearance of the present invention;

[0022] Figure 2 A three-dimensional side cross-sectional schematic diagram of the outer shell of the present invention as a whole;

[0023] Figure 3 It is a three-dimensional enlarged schematic diagram of the side section of the outer shell of the present invention after the three-dimensional side section of the outer shell as a whole;

[0024] Figure 4 It is a three-dimensional enlarged schematic diagram of the overall compression protection device of the present invention;

[0025] Figure 5 For the present invention as a whole Figure 2 A is a three-dimensional enlarged schematic diagram of the middle part;

[0026] Figure 6 For the present invention as a whole Figure 2 A three-dimensional enlarged schematic diagram of B in the middle;

[0027] Figure 7 For the present invention as a whole Figure 3 A three-dimensional enlarged schematic diagram of C in the middle;

[0028] Figure 8 For the present invention as a whole Figure 6 A three-dimensional enlarged schematic diagram of D in the figure.

[0029] In the figure: 1, outer shell; 2, grinding brush roller; 3, notch; 4, conveyor belt; 5, material support plate; 6, clamping protection device; 61, fixed plate; 62, three-phase asynchronous motor; 63, reciprocating screw rod; 64, threaded sleeve; 65, clamping rod; 66, limit rod; 67, rack rod; 68, large gear; 69, rack plate; 610, extrusion rod; 611, adjustment shaft; 612, force block; 613, lower Material inclined plate; 614, connecting rod; 7, detection device; 71, L-shaped arc groove; 72, matching L-shaped arc plate; 73, detection plate; 74, scale; 75, scale rod; 76, pressure rod; 77, spring fixing plate; 78, reset spring; 8, intermittent soot blowing assembly; 81, air pressure pump; 82, booster piston block; 83, air pressure extension pipe; 84, air outlet pipe; 85, tension spring; 86, soot box. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] See also Figure 1-7 , one embodiment of the present invention is: a combined multi-brush grinding device for grinding PCB boards comprises an outer shell 1, a grinding brush roller 2 is fixedly connected to the inner side of the outer shell 1, two notches 3 are provided on both sides of the outer shell 1, a conveyor belt 4 is passed through the two notches 3, a material unloading support plate 5 is fixedly connected to the side of the outer shell 1, and a pressing protection device 6 is provided on the side of the outer shell 1;

[0032] The clamping protection device 6 includes a fixed plate 61, the side of the fixed plate 61 is fixedly connected to the side of the outer shell 1, the bottom of the fixed plate 61 is fixedly connected to a three-phase asynchronous motor 62, the output shaft of the three-phase asynchronous motor 62 is fixedly connected to a reciprocating screw 63, the circumferential surface of the reciprocating screw 63 is threadedly connected to a threaded sleeve 64, the circumferential surface of the threaded sleeve 64 is fixedly connected to a clamping rod 65, the side of the threaded sleeve 64 is fixedly connected to a limiting rod 66, the side of the limiting rod 66 is fixedly connected to a rack rod 67, a large gear 68 passes through the side of the outer shell 1, the front side of the outer shell 1 is slidably connected to a rack plate 69, the side of the rack plate 69 is fixedly connected to an extrusion rod 610, the inner side surfaces of the two blanking support plates 5 are rotatably connected to an adjusting shaft 611, and the circumferential surface of the adjusting shaft 611 is fixedly connected to a force block 612 and a blanking inclined plate 613.

[0033] One end of the limit rod 66 is slidably connected to the side of the outer shell 1, the side of the rack rod 67 is meshed with one side of the large gear 68, and the other side of the large gear 68 is meshed with one side of the rack plate 69. One end of the limit rod 66 is slidably connected to the side of the outer shell 1, limiting the displacement of the threaded sleeve 64, thereby enhancing the stability of the device during operation.

[0034] A connecting rod 614 is fixedly connected to the side of the outer shell 1, one end of the connecting rod 614 meshes with one end of the large gear 68, and the top of the force block 612 is located on the displacement track of the extrusion rod 610. Such a design is conducive to ensuring the stability of the operation of the device.

[0035] When in use, first place the PCB board to be processed on the top of the conveyor belt 4. When the PCB board passes through the notch 3 and enters the outer shell 1, start the grinding brush roller 2 to grind the top of the PCB board. At the same time, start the three-phase asynchronous motor 62 to drive the reciprocating screw 63 to rotate, thereby driving the threaded sleeve 64 to move vertically back and forth following the thread set on the reciprocating screw 63 under the limiting action of the limit rod 66, and then drive the clamping rod 65 to move vertically back and forth. When the clamping rod 65 moves to the top of the PCB board, it is in the grinding working state of the grinding brush roller 2.

[0036] When the clamping rod 65 is moving upward, the grinding is completed, and the rack rod 67 fixed on the side of the limit rod 66 moves upward along with the clamping rod 65. The upward displacement of the rack rod 67 drives the large gear 68 rotating on the side of the connecting rod 614 to rotate counterclockwise. The counterclockwise rotation of the large gear 68 drives the rack plate 69 meshing on the side to slide downward on the positive side of the outer shell 1, thereby driving the extrusion rod 610 fixed on the side of the rack plate 69 to move downward. The downward displacement of the extrusion rod 610 drives the force block 612 fixed on the circumferential surface of the adjusting shaft 611 to rotate, thereby driving The adjusting shaft 611 on the opposite surfaces of the two unloading support plates 5 rotates counterclockwise, thereby driving the unloading inclined plate 613 fixed on the circumferential surface of the adjusting shaft 611 to rotate counterclockwise. When the unloading inclined plate 613 rotates counterclockwise until it is close to the bottom of the conveyor belt 4, the PCB board falls from the conveyor belt 4 to the unloading inclined plate 613 through another slot 3, shortening the initial gravity acceleration time of the PCB board falling onto the unloading inclined plate 613, thereby reducing the gravity of the PCB board falling onto the unloading inclined plate 613, avoiding damage to the PCB board during the unloading process.

[0037] See also Figure 1-8 On the basis of the above embodiment, in another embodiment of the present invention, a detection device 7 is provided on the positive side of the outer shell 1, and the detection device 7 includes an L-shaped arc groove 71, one end of the L-shaped arc groove 71 is opened on the positive side of the outer shell 1, and an adapting L-shaped arc plate 72 is slidably connected inside the L-shaped arc groove 71, and a detection plate 73 is fixedly connected to the side of the adapting L-shaped arc plate 72, and a scale 74 is opened on the side of the detection plate 73, and a scale rod 75 is slidably connected to the side of the detection plate 73, and a pressure rod 76 is fixedly connected to the side of the rack plate 69. The design of the detection device 7 is mainly to perform regional thickness detection on the top of the ground PCB board to prevent the tool on the grinding brush roller 2 from being damaged due to long-term use, resulting in uneven thickness of a certain PCB board during grinding, strengthen quality inspection supervision, and improve product quality.

[0038] A spring fixing plate 77 is fixedly connected inside the L-shaped arc groove 71, and a return spring 78 is fixedly connected to the bottom of the spring fixing plate 77, and one end of the return spring 78 is fixedly connected to one end of the matching L-shaped arc plate 72. The function of the return spring 78 is mainly to automatically return the matching L-shaped arc plate 72 to a new position when it is not subjected to the squeezing force of the pressure rod 76 through its elasticity.

[0039] The top of the L-shaped arc plate 72 is located on the displacement track of the pressure rod 76, and the bottom of the scale rod 75 is located directly above the conveyor belt 4. The top of the L-shaped arc plate 72 is located on the displacement track of the pressure rod 76, so that the pressure rod 76 can better drive the L-shaped arc plate 72 to move during the displacement process.

[0040] An intermittent soot blowing assembly 8 is provided on the inner side of the outer shell 1, and the intermittent soot blowing assembly 8 includes an air pressure pump 81, one end of which is penetrated by a booster piston block 82, and the other end of which is fixedly penetrated by an air pressure extension pipe 83, and one end of which is fixedly connected to an air outlet pipe 84. The function of the intermittent soot blowing assembly 8 is mainly to remove the residues generated during the grinding process through the internal air pressure of the air pressure pump 81 and the upward extrusion force of the rack rod 67, through the convergence of the clamping rod 65 and the blowing force at one end of the air outlet pipe 84.

[0041] One end of the air pump 81 is connected to one end of the air outlet pipe 84 through the inside of the air pressure extension pipe 83, and the bottom of the booster piston block 82 is located on the displacement track of the rack rod 67. The bottom of the booster piston block 82 is located on the displacement track of the rack rod 67, so that the rack rod 67 can more accurately squeeze the bottom of the booster piston block 82 during the displacement process, and then the gas inside the air pump 81 is conducted to one end of the air outlet pipe 84 through the air pressure extension pipe 83 for discharge.

[0042] A tension spring 85 is fixedly sleeved on the outer surface of the booster piston block 82, and one end of the tension spring 85 is fixedly connected to one end of the air pump 81 close to the booster piston block 82. The design of the tension spring 85 mainly utilizes elasticity to intermittently bounce the booster piston block 82, thereby adapting to the work of the compression protection device 6 and performing coordinated work.

[0043] A dust box 86 is fixedly connected to the side of the conveyor belt 4, and one end of the air outlet pipe 84 is located obliquely below the clamping rod 65, and the dust box 86 and the air outlet pipe 84 are located on the same vertical horizontal line. The dust box 86 is designed mainly to collect dust that falls when the air outlet pipe 84 is discharged. One end of the air outlet pipe 84 is located obliquely below the clamping rod 65, so that when the clamping rod 65 presses down on the top of the PCB board to clamp it, the dust remaining in the grinding that is blocked by the side of the clamping rod 65 can be better removed.

[0044] When in use, when the rack plate 69 is in the process of moving downward, the PCB board is in the state of being ground and unloaded, the rack plate 69 moves downward, driving the pressure rod 76 to move downward, and the pressure rod 76 moves downward to squeeze the matching L-shaped arc plate 72 sliding in the L-shaped arc groove 71. The top of the matching L-shaped arc plate 72 is squeezed and drives the detection plate 73 to move downward in an arc first, and then move horizontally. When the detection plate 73 moves downward in an arc, the scale rod 75 sliding on its side contacts the top of the PCB board; during the horizontal displacement process, the bottom end of the scale rod 75 will detect whether the top of the PCB board is uneven. If it is uneven, the bottom end of the scale rod 75 will move downward and upward, and the staff can detect the quality of the PCB board after grinding according to the scale of the scale rod 75;

[0045] When the rack rod 67 rises again, it is in the unloading state. At this time, during the rising process of the rack rod 67, the booster piston block 82 that penetrates through the bottom of the air pump 81 and slides with the bottom of the air pump 81 will be squeezed. The air pressure inside the air pump 81 will increase, and the compressed gas will be transmitted to the inside of the air outlet pipe 84 through the air pressure extension pipe 83. The air outlet pipe 84 will exhaust gas. When the clamping rod 65 is pressed against the top of the PCB board, the grinding debris blocked by the side will be blown to the inside of the ash box 86 for chip removal.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A combined multi-brush grinding device for grinding PCB boards, comprising an outer shell (1), characterized in that: A grinding brush roller (2) is fixedly connected to the inner side surface of the outer shell (1), two notches (3) are provided on both sides of the outer shell (1), and a conveyor belt (4) passes through the two notches (3), a material unloading support plate (5) is fixedly connected to the side surface of the outer shell (1), and a pressing protection device (6) is provided on the side surface of the outer shell (1); The clamping protection device (6) comprises a fixing plate (61), the side of the fixing plate (61) is fixedly connected to the side of the outer shell (1), the bottom of the fixing plate (61) is fixedly connected to a three-phase asynchronous motor (62), the output shaft of the three-phase asynchronous motor (62) is fixedly connected to a reciprocating screw rod (63), the circumferential surface of the reciprocating screw rod (63) is threadedly connected to a threaded sleeve (64), the circumferential surface of the threaded sleeve (64) is fixedly connected to a clamping rod (65), and the side of the threaded sleeve (64) is fixedly connected to A limit rod (66) is connected, a side surface of the limit rod (66) is fixedly connected to a rack rod (67), a side surface of the outer shell (1) is penetrated by a large gear (68), a front side surface of the outer shell (1) is slidably connected to a rack plate (69), a side surface of the rack plate (69) is fixedly connected to an extrusion rod (610), the inner side surfaces of the two blanking support plates (5) are rotatably connected to an adjustment shaft (611), and a force block (612) and a blanking inclined plate (613) are fixedly connected to the circumferential surface of the adjustment shaft (611).

2. The combined multi-brush grinding device for grinding PCB boards according to claim 1, characterized in that: One end of the limit rod (66) is slidably connected to the side of the outer shell (1), the side of the rack rod (67) is meshed with one side of the large gear (68), and the other side of the large gear (68) is meshed with one side of the rack plate (69).

3. The combined multi-brush grinding device for grinding PCB boards according to claim 2, characterized in that: A connecting rod (614) is fixedly connected to the side of the outer shell (1), one end of the connecting rod (614) is meshed with one end of the large gear (68), and the top of the force block (612) is located on the displacement track of the extrusion rod (610).

4. The combined multi-brush grinding device for grinding PCB boards according to claim 3, characterized in that: A detection device (7) is provided on the front side of the outer shell (1), and the detection device (7) comprises an L-shaped arc groove (71), one end of which is opened on the front side of the outer shell (1), an adapting L-shaped arc plate (72) is slidably connected inside the L-shaped arc groove (71), a detection plate (73) is fixedly connected to the side of the adapting L-shaped arc plate (72), a scale (74) is opened on the side of the detection plate (73), a scale rod (75) is slidably connected to the side of the detection plate (73), and a pressure rod (76) is fixedly connected to the side of the rack plate (69).

5. The combined multi-brush grinding device for grinding PCB boards according to claim 4, characterized in that: A spring fixing plate (77) is fixedly connected inside the L-shaped arc groove (71), a return spring (78) is fixedly connected to the bottom of the spring fixing plate (77), and one end of the return spring (78) is fixedly connected to one end of the matching L-shaped arc plate (72).

6. The combined multi-brush grinding device for grinding PCB boards according to claim 5, characterized in that: The top of the adapting L-shaped arc plate (72) is located on the displacement track of the pressure rod (76), and the bottom of the scale rod (75) is located directly above the conveyor belt (4).

7. The combined multi-brush grinding device for grinding PCB boards according to claim 6, characterized in that: An intermittent soot blowing assembly (8) is arranged on the inner side surface of the outer shell (1), and the intermittent soot blowing assembly (8) comprises an air pressure pump (81), one end of the air pressure pump (81) is penetrated by a booster piston block (82), the other end of the air pressure pump (81) is fixedly penetrated by an air pressure extension pipe (83), and one end of the air pressure extension pipe (83) is fixedly connected to an air outlet pipe (84).

8. The combined multi-brush grinding device for grinding PCB boards according to claim 7, characterized in that: One end of the air pump (81) is connected to one end of the air outlet pipe (84) through the interior of the air pressure extension pipe (83), and the bottom of the booster piston block (82) is located on the displacement track of the rack rod (67).

9. The combined multi-brush grinding device for grinding PCB boards according to claim 8, characterized in that: A tension spring (85) is fixedly sleeved on the outer surface of the boosting piston block (82), and one end of the tension spring (85) is fixedly connected to one end of the air pressure pump (81) close to the boosting piston block (82).

10. The combined multi-brush grinding device for grinding PCB boards according to claim 9, characterized in that: A dust box (86) is fixedly connected to the side of the conveyor belt (4), one end of the air outlet pipe (84) is located obliquely below the pressing rod (65), and the dust box (86) and the air outlet pipe (84) are located on the same vertical horizontal line.

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