A presser foot switching device based on a PCB drilling machine

Abstract

The application discloses a presser foot switching device based on a PCB drilling machine and belongs to the field of presser feet of drilling machines. The presser foot switching device based on the PCB drilling machine comprises a drilling machine body, the bottom of the drilling machine body is fixedly connected with a mounting plate, the bottom of the mounting plate is fixedly connected with a servo motor, the bottom of the servo motor is rotationally connected with a presser foot plate, and the upper end surface of the presser foot plate is provided with a presser foot hole. Through cooperation between the air suction pump, the air suction groove, the air suction pipe, the filter groove, the filter screen, the driven shaft and the driven blades, the residues and dust generated during drilling can be collected into the air suction groove, and in the process of suction, the rotation of the driven blades will form a water curtain around the driven blades, so that the residues and dust are blocked, the generation of dust is effectively reduced, the residues and dust are captured into the clean water, the residue collection effect is improved, and the cleanness of the drilling site is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drill press foot, and particularly relates to a foot switching device based on a PCB drill press. BACKGROUND

[0002] It is known that the PCB drilling process is a key process in the entire production process of printed circuit boards, which mainly uses a PCB drill press equipped with a high-speed spindle and a drill bit to drill the circuit board, and the foot switching device is the main execution component of the PCB drill press during drilling. In the drilling process, the foot switching device not only holds the PCB board, but also frequently adjusts the size of the foot hole during frequent switching of different diameter drill bits, so as to match the corresponding diameter drill bit.

[0003] At present, the existing foot switching device of the PCB drill press has the following problems in use: firstly, the dust and debris generated during drilling cannot be effectively and quickly removed, so that the PCB board is easily damaged due to the falling of impurities on the PCB board, or the drilling precision is affected due to the blockage of impurities in the foot hole, and even the drill bit is damaged; secondly, after the PCB board is drilled, there will be burrs on the edge of the drilled hole, and the traditional foot device cannot effectively process the burrs here, thereby reducing the production quality of the PCB board. Therefore, a foot switching device based on a PCB drill press is proposed. SUMMARY

[0004] The purpose of the present application is to solve the problems in the prior art that the dust and debris generated during drilling cannot be effectively and quickly removed, and the burrs generated on the edge of the drilled hole cannot be effectively processed, and a foot switching device based on a PCB drill press is proposed.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] A foot switching device based on a PCB drill press, comprising a drill press body, the bottom of the drill press body is fixedly connected with a mounting plate, the bottom of the mounting plate is fixedly connected with a servo motor, the bottom of the servo motor is rotatably connected with a foot plate, the upper end surface of the foot plate is provided with a foot hole, three foot holes are annularly provided along the rotation axis center of the servo motor, the sizes of the three foot holes are different, and the foot hole located in the middle is aligned with the rotating rod of the drill press body, further comprising: a slag suction assembly, the slag suction assembly is arranged in the foot plate and is used for adsorbing and collecting the debris generated during drilling; and an edge cleaning mechanism, the edge cleaning mechanism is arranged in the foot plate and is used for edge grinding treatment of the PCB drilling edge.

[0007] In order to improve the neatness of the drilling scene, preferably, the suction assembly comprises an air suction pump fixedly connected with the bottom of the drilling machine body, an air suction groove is formed in the inside of the presser foot plate, the air suction groove is communicated with the inner cavity of the presser hole, an air suction pipe is fixedly connected with the end of the air suction groove, and the end of the air suction pipe away from the air suction groove is communicated with the input end of the air suction pump.

[0008] In order to improve the effect of collecting debris, further, a filter groove is formed in the inside of the presser foot plate, the filter groove is coaxial with the air suction groove, a filter screen is fixedly connected with the communication part of the air suction groove and the filter groove, a driven shaft is fixedly connected with the side wall of the filter screen, and a driven blade is fixedly connected with the end of the driven shaft away from the filter screen.

[0009] Further, a water blocking box is fixedly connected with the communication part of the air suction pipe and the input end of the air suction pump, and a waterproof and breathable cloth is fixedly connected in the water blocking box.

[0010] In order to improve the drilling quality, preferably, the edge cleaning mechanism comprises an edge cleaning groove formed in the bottom of the presser foot plate, the edge cleaning groove is coaxial with the presser hole, an edge cleaning ring is rotatably connected in the edge cleaning groove, an edge cleaning soft brush is fixedly connected with the bottom of the edge cleaning ring, and the inner diameter of the edge cleaning groove is larger than the inner diameter of the presser hole.

[0011] Further, fitting grooves are formed in the inner wall of the edge cleaning ring at equal intervals, fitting blocks are slidably connected in the fitting grooves, fitting springs are fixedly connected between the side wall of the fitting block and the fitting groove, the cavity formed between the three fitting blocks has an inner diameter smaller than the inner diameter of the presser hole, and the side wall of the fitting block extends out of the fitting groove and is provided in an arc-shaped round corner.

[0012] In order to improve the use effect of the filter screen, further, a cleaning groove is formed in the inside of the filter groove, air inflatable telescopic rods are fixedly connected on both sides of the cleaning groove, a cleaning plate is slidably connected with the inner wall of the cleaning groove, the movable end of the air inflatable telescopic rod is fixedly connected with the bottom of the cleaning plate, the brush on the side wall of the cleaning plate is fitted with the side wall of the filter screen, a gas guide groove is communicated with the side wall of the fitting groove, and the end of the gas guide groove away from the fitting groove is communicated with the inner cavity of the air inflatable telescopic rod.

[0013] Further, the three fitting grooves are communicated with each other, and the two air inflatable telescopic rods are communicated with each other.

[0014] In order to ensure the accuracy after switching, preferably, a positioning rod is fixedly connected with the middle of the upper end surface of the presser foot plate, positioning arc plates are fixedly connected on both sides of the drilling machine body, and the distance from the center of the positioning rod and the positioning arc plate to the center of the rotating shaft of the servo motor is the same.

[0015] Further, the positioning arc plate side wall is provided with a positioning clamping groove, a positioning plate is slidably connected in the positioning clamping groove, and a positioning spring is fixedly connected between the side wall of the positioning plate and the positioning clamping groove.

[0016] Compared with the prior art, the application provides a presser foot switching device based on a PCB drilling machine, which has the following beneficial effects:

[0017] 1. The presser foot switching device based on the PCB drilling machine can collect residues and dust generated during drilling into the air suction groove, and the rotation of the driven blade will form a water curtain around it during the suction process, thereby blocking the residues and dust, effectively reducing the generation of dust, and making the residues and dust be captured into the clean water, improving the collection effect of the residues, and thus improving the neatness of the drilling site.

[0018] 2. The presser foot switching device based on the PCB drilling machine can use the edge cleaning soft brush at the bottom of the edge cleaning ring to brush and clean the drilling edge during drilling, effectively reducing the existence of burrs at the drilling site, and improving the drilling quality of the PCB; and the filter screen can be cleaned by cooperating with the air guide groove, the air inflation telescopic rod and the cleaning plate, effectively avoiding the attachment of dust and impurities on the side wall of the filter screen, and improving the use effect of the filter screen. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a front view of the overall structure of the presser foot switching device based on the PCB drilling machine.

[0020] Figure 2 It is a side view of the half-section structure of the presser foot switching device based on the PCB drilling machine.

[0021] Figure 3 It is a side view of the half-section structure of the presser foot switching device based on the PCB drilling machine. Figure 2 It is an enlarged structure diagram of area A of the presser foot switching device based on the PCB drilling machine.

[0022] Figure 4 It is an enlarged structure diagram of area B of the presser foot switching device based on the PCB drilling machine. Figure 2

[0023] Figure 5 It is an internal section structure diagram of the presser foot plate of the presser foot switching device based on the PCB drilling machine.

[0024] ​Figure 6 Figure 1 is a schematic view of a PCB drilling machine based on a presser foot switching device according to the present application;

[0025] Figure 7 Figure 2 is a schematic view of a PCB drilling machine based on a presser foot switching device according to the present application; Figure 6 Figure 3 is a schematic view of a middle C area of a PCB drilling machine based on a presser foot switching device according to the present application.

[0026] In the figure: 1, drilling machine body; 2, mounting plate; 21, servo motor; 22, presser foot plate; 23, presser foot hole; 3, slag suction assembly; 31, air suction pump; 32, air suction groove; 33, air suction pipe; 34, filter groove; 341, cleaning groove; 342, inflatable telescopic rod; 343, cleaning plate; 35, filter screen; 36, driven shaft; 37, driven blade; 38, water baffle box; 4, edge cleaning mechanism; 41, edge cleaning groove; 42, edge cleaning ring; 43, edge cleaning soft brush; 44, fitting groove; 441, fitting block; 442, fitting spring; 45, air guide groove; 5, positioning rod; 6, positioning arc plate; 61, positioning clamping groove; 62, positioning plate; 63, positioning spring. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0028] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0029] Embodiment:

[0030] With reference to Figures 1-7 A presser foot switching device based on a PCB drilling machine, comprising a drilling machine body 1, the bottom of the drilling machine body 1 is fixedly connected with a mounting plate 2, the bottom of the mounting plate 2 is fixedly connected with a servo motor 21, the bottom of the servo motor 21 is rotatably connected with a presser foot plate 22, the upper end face of the presser foot plate 22 is provided with presser foot holes 23, the presser foot holes 23 are annularly provided along the center of the rotation axis of the servo motor 21, there are three presser foot holes 23, the sizes of the three presser foot holes 23 are different, the presser foot hole 23 located in the middle is aligned with the rotating rod of the drilling machine body 1, further comprising: a slag suction assembly 3, the slag suction assembly 3 is arranged in the presser foot plate 22, and is used for adsorbing and collecting the debris generated by drilling; an edge cleaning mechanism 4, the edge cleaning mechanism 4 is arranged in the presser foot plate 22, and is used for edge grinding treatment on the edge of the PCB drilling.

[0031] By the arrangement of the above structure, the servo motor 21 drives the presser plate 22 to rotate, so that different presser holes 23 are aligned with the drill rod of the drill body 1, thereby completing the switching of different size presser holes 23, improving the convenience of switching the presser holes 23; and through the arrangement of the slag suction assembly 3, the residues and dust generated during drilling can be sucked into the air suction groove 32, thereby improving the cleanliness of the drilling site; and cooperating with the setting of the edge cleaning mechanism 4, the drilling edge is brushed and cleaned, effectively reducing the existence of burrs at the drilling site, and improving the opening quality of the PCB.

[0032] Referring to Figure 2 , Figure 4 , wherein the slag suction assembly 3 comprises an air suction pump 31 fixedly connected with the bottom of the drill body 1, an air suction groove 32 is formed in the inside of the presser plate 22, the air suction groove 32 is in communication with the inner cavity of the presser hole 23, an air suction pipe 33 is fixedly connected at the end of the air suction groove 32, the end of the air suction pipe 33 away from the air suction groove 32 is in communication with the input end of the air suction pump 31, a filter groove 34 is formed in the inside of the presser plate 22, the filter groove 34 is coaxial with the air suction groove 32, a filter screen 35 is fixedly connected at the communication part of the air suction groove 32 and the filter groove 34, a driven shaft 36 is fixedly connected with the side wall of the filter screen 35, and a driven blade 37 is fixedly connected with the end of the driven shaft 36 away from the filter screen 35;

[0033] Through the arrangement of the above structure, the air suction pump 31 is started, thereby generating a negative pressure adsorption force in the air suction groove 32, so that the residues and dust generated in the presser hole 23 during drilling are sucked into the air suction groove 32 and are hindered by the filter screen 35, and the residues and dust are collected in the filter groove 34, thereby improving the cleanliness of the drilling site; and under the action of suction force, the airflow in the presser hole 23 will move quickly, thereby effectively taking away the heat generated at the end of the rotating rod due to friction, improving the durability of the rotating rod, and the flowing airflow will drive the driven blade 37 to rotate, at this time, the filter groove 34 is filled with a certain amount of clean water, which will continuously adhere to the driven blade 37 under the rotating effect of the driven blade 37, and a water curtain will be formed around the driven blade 37 by the centrifugal force of the driven blade 37, thereby blocking the residues and dust, effectively reducing the generation of dust, and capturing the residues and dust into the clean water, improving the collection effect of the residues.

[0034] Referring to Figure 1 , Figure 2 , wherein the communication part of the air suction pipe 33 and the input end of the air suction pump 31 is fixedly connected with a water blocking box 38, and a waterproof and breathable cloth is fixedly connected in the water blocking box 38;

[0035] Through the arrangement of the above structure, under the action of suction, part of the clean water will be brought into the suction pipe 33, and under the action of the water blocking box 38, this part of the clean water will be blocked down to avoid being sucked into the suction pump 31. Subsequently, when the suction pump 31 is closed, the clean water will flow back to the filter tank 34 along the suction pipe 33 under the action of gravity, and thus the filter screen 35 is backwashed, improving the use effect of the filter screen 35.

[0036] With reference to Figure 2 , Figure 3 and Figure 5 , wherein the edge cleaning mechanism 4 comprises an edge cleaning groove 41, which is arranged at the bottom of the presser plate 22 and communicates with the presser hole 23 coaxially, and the edge cleaning ring 42 is rotatably connected in the edge cleaning groove 41, the edge cleaning soft brush 43 is fixedly connected to the bottom of the edge cleaning ring 42, the inner diameter of the edge cleaning groove 41 is larger than that of the presser hole 23, the abutting grooves 44 are equidistantly arranged on the inner wall of the edge cleaning ring 42, the abutting blocks 441 are slidably connected in the abutting grooves 44, the abutting springs 442 are fixedly connected between the side walls of the abutting blocks 441 and the abutting grooves 44, the inner diameter of the cavity formed between the three abutting blocks 441 is smaller than that of the presser hole 23, and the side walls of the abutting blocks 441 extend out of the abutting grooves 44 and are arranged in an arc-shaped round corner;

[0037] Through the arrangement of the above structure, after the rotating rod of the drilling machine body 1 is inserted into the presser hole 23, the side wall will extrude the abutting blocks 441, so that the abutting blocks 441 retract into the abutting grooves 44. At this time, under the rebounding action of the abutting springs 442, the abutting blocks 441 are tightly abutted with the side wall of the rotating rod. Subsequently, when the rotating rod rotates, the abutting blocks 441 and the edge cleaning ring 42 will also rotate. Thus, during the drilling process, the edge cleaning soft brush 43 at the bottom of the edge cleaning ring 42 is used to grind and clean the edge of the drilling hole, effectively reducing the existence of burrs at the drilling hole and improving the opening quality of the PCB.

[0038] With reference to Figure 5 , Figure 6 , wherein the filter tank 34 is internally provided with a cleaning groove 341, the cleaning groove 341 is fixedly connected with the inflatable telescopic rods 342 on both sides, the cleaning plate 343 is slidably connected to the inner wall of the cleaning groove 341, the movable end of the inflatable telescopic rod 342 is fixedly connected with the bottom of the cleaning plate 343, the brush on the side wall of the cleaning plate 343 is abutted with the side wall of the filter screen 35, the air guide groove 45 is communicated with the side wall of the abutting groove 44, and the end of the air guide groove 45 away from the abutting groove 44 is communicated with the inner cavity of the inflatable telescopic rod 342, the three abutting grooves 44 are communicated with each other, and the two inflatable telescopic rods 342 are communicated with each other;

[0039] Through the arrangement of the above structure, in the process of the abutting block 441 retracting into the abutting groove 44, the airflow in the abutting groove 44 will be extruded, and at this time the airflow will be compressed into the inflatable telescopic rod 342 along the air guide groove 45, so that the inflatable telescopic rod 342 pushes the cleaning plate 343 with clean water to move upwards, thereby cleaning the side wall of the filter screen 35, and then when the rotating rod leaves the presser hole 23, under the action of air pressure and the gravity of the cleaning plate 343, the cleaning plate 343 will reset, thereby cleaning the filter screen 35 again, effectively preventing dust and impurities from adhering to the side wall of the filter screen 35, and improving the use effect of the filter screen 35.

[0040] With reference to Figure 1 , Figure 6 and Figure 7 , wherein the upper end surface of the presser plate 22 is fixedly connected with a positioning rod 5 in the middle, both sides of the drill body 1 are fixedly connected with positioning arc plates 6, the distance from the center of the positioning rod 5 and the positioning arc plate 6 to the center of the rotating shaft of the servo motor 21 is the same, the side wall of the positioning arc plate 6 is provided with a positioning clamping groove 61, a positioning plate 62 is slidably connected in the positioning clamping groove 61, and a positioning spring 63 is fixedly connected between the side wall of the positioning plate 62 and the positioning clamping groove 61, and the side wall of the positioning plate 62 extends out of the positioning clamping groove 61 and is provided in an arc shape with rounded corners;

[0041] Through the arrangement of the above structure, the servo motor 21 drives the presser plate 22 to rotate, so that the positioning rod 5 rotates into the inside of the positioning arc plate 6, at this time the side wall of the positioning rod 5 will extrude the side wall of the positioning plate 62, so that the positioning plate 62 retracts into the positioning clamping groove 61, and after the servo motor 21 stops rotating, under the rebounding action of the positioning spring 63, the positioning plate 62 will clamp the positioning rod 5, thereby ensuring the stability of the positioning rod 5, avoiding the loosening of the rotating shaft of the servo motor 21 causing the subsequent deviation of the positioning rod 5, and ensuring the accuracy of the switching of the presser hole 23.

[0042] With reference to Figures 1-7, In the application, when in use, first, the drill body 1 works, the rotating shaft will drill the PCB through the presser hole 23 aligned with it, and open the air suction pump 31 during drilling to generate negative pressure adsorption in the air suction groove 32, so that the residue and dust generated in the presser hole 23 during drilling are sucked into the air suction groove 32, and after being hindered by the filter screen 35, the residue and dust will be collected in the filter groove 34, and the airflow in the presser hole 23 will move quickly under the action of suction, so as to effectively take away the heat generated at the end of the rotating shaft due to friction, and the flowing airflow will drive the driven blade 37 to rotate, at this time, the filter groove 34 is filled with a certain amount of clean water, which will continuously adhere to the driven blade 37 under the rotating effect of the driven blade 37, and a water curtain will be formed around the driven blade 37 by the centrifugal force of the driven blade 37, so as to block the residue and dust;

[0043] And after the rotating shaft of the drill body 1 is inserted into the presser hole 23, the side wall will extrude the fitting block 441, so that the fitting block 441 is retracted into the fitting groove 44, at this time, under the rebounding action of the fitting spring 442, the fitting block 441 is tightly fitted with the rotating shaft side wall, and then when the rotating shaft rotates, the fitting block 441 and the edge cleaning ring 42 will also rotate, so that in the drilling process, the edge cleaning soft brush 43 at the bottom of the edge cleaning ring 42 is used to brush and clean the edge of the hole; At the same time, in the process of retracting the fitting block 441 into the fitting groove 44, the airflow in the fitting groove 44 will be extruded, and at this time the airflow will be compressed into the inflatable telescopic rod 342 along the air guide groove 45, so that the inflatable telescopic rod 342 pushes the cleaning plate 343 soaked with clean water to move upward, so that the side wall of the filter screen 35 is cleaned, and then when the rotating shaft leaves the presser hole 23, the cleaning plate 343 will reset under the action of air pressure and gravity of the cleaning plate 343, so that the filter screen 35 is cleaned again, effectively preventing dust and impurities from adhering to the side wall of the filter screen 35;

[0044] When it is necessary to switch the size of the presser hole 23, the servo motor 21 drives the presser plate 22 to rotate, so that the positioning rod 5 rotates to the inside of the positioning arc plate 6, and when the positioning rod 5 enters the positioning arc plate 6, the side wall of the positioning rod 5 will extrude the side wall of the positioning plate 62, so that the positioning plate 62 retracts into the positioning clamping groove 61, and when the positioning rod 5 moves to the innermost side of the positioning arc plate 6, the presser hole 23 will also complete the switching, and at this time, under the rebounding action of the positioning spring 63, the positioning plate 62 will clamp the positioning rod 5, avoiding the loosening of the rotating shaft of the servo motor 21 causing the subsequent deviation of the positioning rod 5.

[0045] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical solution and inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A pressure foot switching device based on a PCB drilling machine, comprising a drilling machine body (1), characterized in that, The bottom of the drilling machine body (1) is fixedly connected to a mounting plate (2), and the bottom of the mounting plate (2) is fixedly connected to a servo motor (21). The bottom of the servo motor (21) is rotatably connected to a pressure foot plate (22). The upper end face of the pressure foot plate (22) is provided with a pressure foot hole (23). Three pressure foot holes (23) are provided in a ring around the center of the rotation axis of the servo motor (21). The three pressure foot holes (23) are all different in size, and the pressure foot hole (23) located in the middle is aligned with the rotating rod of the drilling machine body (1). The machine also includes: The slag suction assembly (3) is installed inside the pressure foot plate (22) and is used to absorb and collect the debris generated during drilling. The edge cleaning mechanism (4) is set inside the pressure foot plate (22) and is used to grind the edges of the PCB drill holes. The edge cleaning mechanism (4) includes an edge cleaning groove (41), which is located at the bottom of the presser foot plate (22). The edge cleaning groove (41) is connected to the presser foot hole (23) and is coaxial. An edge cleaning ring (42) is rotatably connected inside the edge cleaning groove (41). An edge cleaning soft brush (43) is fixedly connected to the bottom of the edge cleaning ring (42). The inner diameter of the edge cleaning groove (41) is larger than the inner diameter of the presser foot hole (23).

2. The pressure foot switching device based on a PCB drilling machine according to claim 1, characterized in that, The slag suction assembly (3) includes an air suction pump (31), which is fixedly connected to the bottom of the drilling machine body (1). The pressure foot plate (22) has an air suction groove (32) inside, which is connected to the inner cavity of the pressure foot hole (23). An air extraction pipe (33) is fixedly connected to the end of the air suction groove (32), and the end of the air extraction pipe (33) away from the air suction groove (32) is connected to the input end of the air suction pump (31).

3. The pressure foot switching device based on a PCB drilling machine according to claim 2, characterized in that, The pressure foot plate (22) has a filter groove (34) inside. The filter groove (34) is connected to the air intake groove (32) and is coaxial. A filter screen (35) is fixedly connected at the connection between the air intake groove (32) and the filter groove (34). A driven shaft (36) is fixedly connected to the side wall of the filter screen (35). A driven blade (37) is fixedly connected to the end of the driven shaft (36) away from the filter screen (35).

4. The pressure foot switching device based on a PCB drilling machine according to claim 2, characterized in that, A water-blocking box (38) is fixedly connected at the connection between the air extraction pipe (33) and the input end of the air pump (31), and a waterproof and breathable cloth is fixedly connected inside the water-blocking box (38).

5. The pressure foot switching device based on a PCB drilling machine according to claim 3, characterized in that, The inner wall of the cleaning ring (42) is provided with equal-spaced fitting grooves (44), and a fitting block (441) is slidably connected in the fitting groove (44). A fitting spring (442) is fixedly connected between the side wall of the fitting block (441) and the fitting groove (44). The inner diameter of the cavity formed between the three fitting blocks (441) is smaller than the inner diameter of the pressure foot hole (23), and the side wall of the fitting block (441) extends out of the fitting groove (44) and is set with an arc-shaped rounded corner.

6. The pressure foot switching device based on a PCB drilling machine according to claim 5, characterized in that, The filter tank (34) has a cleaning groove (341) inside. Both sides of the cleaning groove (341) are fixedly connected to an inflatable telescopic rod (342). The inner wall of the cleaning groove (341) is slidably connected to a cleaning plate (343). The movable end of the inflatable telescopic rod (342) is fixedly connected to the bottom of the cleaning plate (343). The brush on the side wall of the cleaning plate (343) is in contact with the side wall of the filter screen (35). The side wall of the fitting groove (44) is connected to an air guide groove (45). The end of the air guide groove (45) away from the fitting groove (44) is connected to the inner cavity of the inflatable telescopic rod (342).

7. The pressure foot switching device based on a PCB drilling machine according to claim 6, characterized in that, The three fitting grooves (44) are interconnected, and the two inflatable telescopic rods (342) are interconnected.

8. The pressure foot switching device based on a PCB drilling machine according to claim 1, characterized in that, A positioning rod (5) is fixedly connected to the middle of the upper end face of the presser foot plate (22), and positioning arc plates (6) are fixedly connected to both sides of the drilling machine body (1). The distance from the center of the positioning rod (5) and the center of the positioning arc plate (6) to the center of the rotation axis of the servo motor (21) is the same.

9. A pressure foot switching device based on a PCB drilling machine according to claim 8, characterized in that, The positioning arc plate (6) has a positioning slot (61) on its side wall. A positioning plate (62) is slidably connected in the positioning slot (61). A positioning spring (63) is fixedly connected between the side wall of the positioning plate (62) and the positioning slot (61). The side wall of the positioning plate (62) extends out of the positioning slot (61) and is set with an arc-shaped rounded corner.

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