Rotary PIN structure and method for PCB (Printed Circuit Board) back drilling processing

Abstract

The invention discloses a rotary PIN structure and method for PCB (printed circuit board) back drilling processing, relates to the technical field of PCB processing, and solves the problems that the efficiency is low, products are possibly damaged and the positioning accuracy and stability are insufficient when PINs are used for positioning in the PCB back drilling processing. The invention discloses a rotary PIN structure and method for PCB back drilling processing, and the structure comprises a housing mechanism, the interior of the housing mechanism is provided with two positioning mechanisms, and the interior of each positioning mechanism is provided with a PIN main body mechanism. A servo motor drives a driving gear to rotate, the driving gear drives a driven gear to rotate, then the driven gear drives a lead screw to rotate, at the moment, an adjusting ring can ascend and descend on the surface, the adjusting ring pushes four fan-shaped PINs, then the fan-shaped PINs located in the PIN holes are slowly attached to the inner walls of the PIN holes, and therefore the PIN holes can be accurately positioned. Therefore, the fan-shaped PIN nails are used for clamping and positioning the PIN holes of the PCB, so that the device can be adapted to the PIN holes with different sizes for clamping.

Description

Technical Field

[0001] The invention relates to the field of printed circuit board processing, and in particular to a rotary PIN structure and method for PCB back drilling processing. Background Art

[0002] During the PCB back drilling process, the traditional positioning method is usually to set PIN nails on the product for fixing. However, this method has some significant disadvantages. On the one hand, the operation of installing the PIN nails is relatively cumbersome and requires a certain amount of time and manpower, which undoubtedly reduces the overall processing efficiency. On the other hand, the PIN nails may cause certain damage to the PCB board during use, such as scratching the board surface, etc., thereby affecting the quality of the product. In addition, the accuracy and stability of positioning in the traditional method need to be improved. The loosening or displacement of the PIN nails may cause deviations in processing accuracy, thereby increasing the scrap rate.

[0003] The existing PCB back drilling process uses PIN pins for positioning, but has the problems of low efficiency, possible damage to products, and insufficient positioning accuracy and stability; therefore, it does not meet the existing needs. In this regard, we propose a rotating PIN structure and method for PCB back drilling. Summary of the invention

[0004] The purpose of the present invention is to provide a rotating PIN structure and method for PCB back drilling processing, so as to solve the problems of low efficiency, possible damage to products, insufficient positioning accuracy and stability, etc. in the PCB back drilling processing using PIN pins for positioning as mentioned in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a rotary PIN structure for PCB back drilling processing, comprising a housing mechanism, wherein two positioning mechanisms are arranged inside the housing mechanism, and each of the positioning mechanisms is provided with a PIN main body mechanism; The PIN nail main body mechanism includes a fan-shaped PIN nail, a T-slot, a screw and an adjustment ring. The four fan-shaped PIN nails are all movably installed inside the positioning mechanism. The four fan-shaped PIN nails are spliced ​​together to form a cylindrical shape. The bottom of the fan-shaped PIN nail is provided with a T-slot. The inner side of the fan-shaped PIN nail is movably installed with a screw. The outer surface of the screw is connected to the adjustment ring through a thread. The outer surface of the adjustment ring is provided with a bevel. The inner wall surface of the fan-shaped PIN nail is provided with a bevel with the same slope as the outer surface of the adjustment ring. The outer surface of the adjustment ring is in contact with the inner wall surface of the fan-shaped PIN nail.

[0006] Preferably, the PIN nail main body mechanism also includes a special-shaped limiting rod, a PIN nail outer groove, a PIN nail inner groove, an extrusion spring and a driven gear. The outer surface of the fan-shaped PIN nail is provided with two PIN nail outer grooves, the interior of the PIN nail outer groove is provided with a PIN nail inner groove, and the interior of the PIN nail inner groove is movably installed with a special-shaped limiting rod, one end of the special-shaped limiting rod extends to the outside of the PIN nail outer groove, and the other end of the special-shaped limiting rod extends to the inside of the T-shaped groove, and a plurality of extrusion springs are movably installed between the special-shaped limiting rod and the inside of the PIN nail inner groove, and the bottom end of the screw rod is fixedly connected to a driven gear.

[0007] Preferably, the shell mechanism includes a base, a fixed platform, a support plate, a guide rail and a sliding block, the top of the base is rigidly connected to the fixed platform, the top of the fixed platform is fixedly installed with a guide rail, the outer surface of the guide rail is slidably installed with a sliding block, and the top surface of the fixed platform is fixedly installed with multiple support plates.

[0008] Preferably, the shell mechanism also includes a fixed plate, a workbench, a positioning waist hole and a pushing cylinder. The two sides of the top of the support plate are rigidly connected to the workbench, and a fixed plate is movably installed between the two workbenches. The surface of the fixed plate is provided with a positioning waist hole, and the surface of the guide rail is slidably installed with a pushing cylinder.

[0009] Preferably, the positioning mechanism includes a positioning plate, a pushing groove, a positioning platform, a servo motor, a supporting spring and a connecting shaft rod. The positioning plate is installed on the top surface of the sliding block by bolts. A connecting shaft rod is movably installed on the top of the positioning plate. The end of the connecting shaft rod is movably connected to the positioning platform. Two supporting springs are movably installed between the positioning plate and the positioning platform. A pushing groove is provided on one side of the positioning plate, and an assembly groove is provided on the other side of the positioning plate. A servo motor is provided inside the assembly groove.

[0010] Preferably, the positioning mechanism also includes a clamping hole and a driving gear, the output end of the servo motor is connected to the driving gear through a coupling, the driving gear is rotatably connected to the inner wall surface of the assembly groove, and a clamping hole is provided on one side of the positioning platform close to the assembly groove, and two layers of clamping mechanisms are movably installed on the inner wall surface of the clamping hole.

[0011] Preferably, the clamping mechanism includes a movable arc plate, a spring groove, a movable rod, a compression spring, a T-shaped snap buckle and a limit groove. Each layer of the clamping mechanism is provided with four movable arc plates. The outer surface of the movable arc plate is fixedly installed with a movable rod. The inner wall surface of the positioning platform is provided with a spring groove near the clamping mechanism. The movable rods are movably inserted into the spring groove. Compression springs are movably installed between the movable rod and the spring groove. The inner surfaces of the four movable arc plates near the bottom are fixedly installed with T-shaped snap buckles, and the two end surfaces of the T-shaped snap buckles are provided with limit grooves.

[0012] Preferably, the driven gear is rotatably connected to the inner wall surface of the assembly groove, the driven gear is meshingly connected to the driving gear, the top end of the T-slot movably passes through the interior of the positioning waist hole, and the output end of the pushing cylinder movably snaps into the interior of the pushing groove.

[0013] Preferably, the fan-shaped PIN nail is movably installed inside the clamping hole, the movable arc plate is fitted with the outer surface of the fan-shaped PIN nail, the T-shaped snap buckle is movably inserted into the inside of the T-slot, and the end of the special-shaped limit rod located inside the T-slot is movably snapped into the inside of the limit slot.

[0014] A method for using a rotary PIN structure for PCB back drilling, the method comprising the following steps: Step A: Place the PCB to be processed on the surface of the workbench and bring it close to the position of the fan-shaped PIN. Push the positioning plate on the surface of the guide rail by pushing the cylinder to adjust the position of the fan-shaped PIN inside the positioning waist hole. Align the fan-shaped PIN with the PIN hole to be back-drilled on the PCB, and slowly insert the top of the fan-shaped PIN into the PIN hole. Step B: After the fan-shaped PIN is inserted into the PIN hole, the servo motor drives the active gear to rotate, so that the active gear drives the driven gear to rotate, and then the driven gear drives the screw to rotate. At this time, the adjustment ring moves up and down on the surface, so that the adjustment ring pushes the four fan-shaped PINs, so that the fan-shaped PINs move in four directions respectively, and then the fan-shaped PIN located inside the PIN hole slowly approaches the inner wall of the PIN hole, so that the PIN hole of the PCB board is clamped and positioned by the fan-shaped PIN, so as to avoid the situation that the PCB board shakes during the back drilling process and causes the production of defective products, so that the device can adapt to PIN holes of different sizes for clamping; Step C: After the back drilling process is completed, the adjusting ring is driven up and down again by the screw rod so that the adjusting ring no longer limits the inner wall of the fan-shaped PIN pin. At this time, the movable arc plate is pushed by the elastic potential energy of the compression spring to drive the fan-shaped PIN pin to move inward, so that the four fan-shaped PIN pins return to the initial state, which is convenient for clamping and positioning the PIN holes of the remaining PCB boards; Step D: When the PIN main body needs to be removed for replacement and maintenance, first remove the connecting shaft rod, separate the positioning plate and the positioning platform, and then use your hands to move the special-shaped limit rods on both sides of the surface of the fan-shaped PIN to both sides to move the special-shaped limit rods to the internal position of the PIN inner groove. At this time, the special-shaped limit rods no longer limit the T-shaped snap buckle, so that the fan-shaped PIN can be pulled out of the clamping hole, thereby completing the replacement and maintenance of the fan-shaped PIN.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can drive the driving gear to rotate through the cooperation of the screw rod and the adjusting ring through the servo motor, so that the driving gear drives the driven gear to rotate, and then the driven gear drives the screw rod to rotate. At this time, the adjusting ring will move up and down on the surface, so that the adjusting ring pushes the four fan-shaped PIN nails, so that the fan-shaped PIN nails move in four directions respectively, and then the fan-shaped PIN nails located inside the PIN hole slowly approach the inner wall of the PIN hole, so that the PIN hole of the PCB board is clamped and positioned by the fan-shaped PIN nails, so as to avoid the situation where the PCB board shakes during the back drilling process and causes the production of defective products, so that the device can adapt to PIN holes of different sizes for clamping.

[0016] 2. The present invention cooperates with the T-shaped snap buckle and the limit groove. When the PIN nail main body needs to be removed for replacement and maintenance, the connecting shaft rod is first removed, and the positioning plate and the positioning platform are separated. At this time, the special-shaped limit rods on both sides of the surface of the fan-shaped PIN nail can be pulled to both sides by hand to move the special-shaped limit rods to the internal position of the PIN nail inner groove. At this time, the special-shaped limit rods no longer limit the T-shaped snap buckle, so that the fan-shaped PIN nail can be pulled outward from the clamping hole, thereby completing the replacement and maintenance of the fan-shaped PIN nail. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 A cross-sectional front view of the present invention as a whole; Figure 3 A sectional side view of the present invention as a whole; Figure 4 It is a schematic diagram of the local structure of the bottom of the positioning mechanism of the present invention; Figure 5 It is a partial cross-sectional front view of the positioning mechanism of the present invention; Figure 6 For the present invention Figure 5 Top view of the local section in the middle LL direction; Figure 7 It is a partial structural schematic diagram of the bottom of the PIN main body mechanism of the present invention; Figure 8 For the present invention Figure 5 Schematic diagram of the local structure of part A; Fig. 9 For the present invention Figure 6 Schematic diagram of the local structure of part B; Fig.10 For the present invention Fig. 9 Schematic diagram of the local section along the YY direction.

[0018] In the figure: 1. Shell mechanism; 101. Base; 102. Fixed platform; 103. Support plate; 104. Guide rail; 105. Sliding block; 106. Fixed plate; 107. Workbench; 108. Positioning waist hole; 109. Push cylinder; 2. Positioning mechanism; 201. Positioning plate; 202. Pushing groove; 203. Positioning platform; 204. Servo motor; 205. Support spring; 206. Connecting shaft; 207. Clamping hole; 208. Driving gear; 209, movable arc plate; 210, spring groove; 211, movable rod; 212, compression spring; 213, T-shaped snap buckle; 214, limiting groove; 3, PIN nail main body mechanism; 301, fan-shaped PIN nail; 302, T-shaped groove; 303, screw rod; 304, adjusting ring; 305, special-shaped limiting rod; 306, PIN nail outer groove; 307, PIN nail inner groove; 308, extrusion spring; 309, driven gear. DETAILED DESCRIPTION

[0019] 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.

[0020] See also Figures 1 to 10 , an embodiment provided by the present invention: a rotary PIN structure for PCB back drilling processing, comprising a housing mechanism 1, two positioning mechanisms 2 are arranged inside the housing mechanism 1, and a PIN main body mechanism 3 is arranged inside the positioning mechanisms 2; The PIN nail main body mechanism 3 includes a fan-shaped PIN nail 301, a T-shaped slot 302, a screw rod 303 and an adjustment ring 304. The four fan-shaped PIN nails 301 are all movably installed inside the positioning mechanism 2. The four fan-shaped PIN nails 301 are spliced ​​together to form a cylindrical shape. The bottom of the fan-shaped PIN nail 301 is provided with a T-shaped slot 302. The inner side of the fan-shaped PIN nail 301 is movably installed with a screw rod 303. The outer surface of the screw rod 303 is connected to the adjustment ring 304 through a thread. The outer surface of the adjustment ring 304 is provided with a bevel. The inner wall surface of the fan-shaped PIN nail 301 is provided with a bevel with the same slope as the outer surface of the bevel of the adjusting ring 304. The outer surface of the adjusting ring 304 fits with the inner wall surface of the fan-shaped PIN nail 301.

[0021] The PIN nail main body mechanism 3 also includes a special-shaped limiting rod 305, a PIN nail outer groove 306, a PIN nail inner groove 307, an extrusion spring 308 and a driven gear 309. The outer surface of the fan-shaped PIN nail 301 is provided with two PIN nail outer grooves 306, and the interior of the PIN nail outer groove 306 is provided with a PIN nail inner groove 307. The interior of the PIN nail inner groove 307 is movably installed with a special-shaped limiting rod 305, one end of the special-shaped limiting rod 305 extends to the outside of the PIN nail outer groove 306, and the other end of the special-shaped limiting rod 305 extends to the inside of the T-shaped groove 302. A plurality of extrusion springs 308 are movably installed between the special-shaped limiting rod 305 and the interior of the PIN nail inner groove 307, and the bottom end of the screw rod 303 is fixedly connected to a driven gear 309.

[0022] Through the cooperation of the lead screw 303 and the adjusting ring 304, the driving gear 208 can be driven to rotate by the servo motor 204, so that the driving gear 208 drives the driven gear 309 to rotate, and then the driven gear 309 drives the lead screw 303 to rotate. At this time, the adjusting ring 304 will move up and down on the surface of 30, so that the adjusting ring 304 pushes the four fan-shaped PIN nails 301, and the fan-shaped PIN nails 301 move in four directions respectively, so that the fan-shaped PIN nails 301 located inside the PIN hole slowly approach the inner wall of the PIN hole, so that the PIN hole of the PCB board is clamped and positioned by the fan-shaped PIN nails 301, so as to avoid the situation where the PCB board shakes during the back drilling process and causes the production of defective products, so that the device can adapt to PIN holes of different sizes for clamping.

[0023] The shell mechanism 1 includes a base 101, a fixed platform 102, a support plate 103, a guide rail 104 and a sliding block 105. The top of the base 101 is rigidly connected to the fixed platform 102, the top of the fixed platform 102 is fixedly installed with the guide rail 104, the outer surface of the guide rail 104 is slidably installed with a sliding block 105, and the top surface of the fixed platform 102 is fixedly installed with multiple support plates 103.

[0024] The shell mechanism 1 also includes a fixed plate 106, a workbench 107, a positioning waist hole 108 and a pushing cylinder 109. The two sides of the top of the support plate 103 are rigidly connected to the workbench 107. A fixed plate 106 is movably installed between the two workbenches 107. The surface of the fixed plate 106 is provided with a positioning waist hole 108, and the surface of the guide rail 104 is slidably installed with a pushing cylinder 109.

[0025] The positioning mechanism 2 includes a positioning plate 201, a pushing groove 202, a positioning platform 203, a servo motor 204, a supporting spring 205 and a connecting shaft 206. The positioning plate 201 is installed on the top surface of the sliding block 105 by bolts. A connecting shaft 206 is movably installed at the top of the positioning plate 201, and the end of the connecting shaft 206 is movably connected to the positioning platform 203. Two supporting springs 205 are movably installed between the positioning plate 201 and the positioning platform 203. A pushing groove 202 is provided on one side of the positioning plate 201, and an assembly groove is provided on the other side of the positioning plate 201. A servo motor 204 is provided inside the assembly groove.

[0026] The positioning mechanism 2 also includes a clamping hole 207 and a driving gear 208. The output end of the servo motor 204 is connected to the driving gear 208 through a coupling. The driving gear 208 is rotatably connected to the inner wall surface of the assembly groove. A clamping hole 207 is provided on one side of the positioning platform 203 close to the assembly groove, and two layers of clamping mechanisms are movably installed on the inner wall surface of the clamping hole 207.

[0027] The clamping mechanism includes a movable arc plate 209, a spring groove 210, a movable rod 211, a compression spring 212, a T-shaped snap buckle 213 and a limit groove 214. Each layer of the clamping mechanism is provided with four movable arc plates 209. The outer surface of the movable arc plate 209 is fixedly installed with a movable rod 211. The inner wall surface of the positioning platform 203 is provided with a spring groove 210 near the clamping mechanism. The movable rod 211 is movably inserted into the interior of the spring groove 210. A compression spring 212 is movably installed between the movable rod 211 and the interior of the spring groove 210. The inner surfaces of the four movable arc plates 209 near the bottom are fixedly installed with T-shaped snap buckles 213, and the two end surfaces of the T-shaped snap buckle 213 are provided with limit grooves 214.

[0028] Through the cooperation of the T-shaped snap buckle 213 and the limiting groove 214, when the PIN nail main body mechanism 3 needs to be removed for replacement and maintenance, the connecting shaft 206 is first removed, and after the positioning plate 201 and the positioning platform 203 are separated, the special-shaped limiting rods 305 on both sides of the surface of the fan-shaped PIN nail 301 can be pulled to both sides by hand to move the special-shaped limiting rods 305 to the internal position of the PIN nail inner groove 307. At this time, the special-shaped limiting rods 305 no longer limit the T-shaped snap buckle 213, so that the fan-shaped PIN nail 301 can be pulled outward from the clamping hole 207, thereby completing the replacement and maintenance of the fan-shaped PIN nail 301.

[0029] The driven gear 309 is rotatably connected to the inner wall surface of the assembly groove, and the driven gear 309 is meshed with the driving gear 208. The top end of the T-slot 302 moves through the interior of the positioning waist hole 108, pushing the output end of the cylinder 109 to move into the interior of the pushing groove 202.

[0030] The fan-shaped PIN nail 301 is movably installed inside the clamping hole 207, the movable arc plate 209 is in contact with the outer surface of the fan-shaped PIN nail 301, the T-shaped snap buckle 213 is movably inserted into the T-shaped slot 302, and one end of the special-shaped limiting rod 305 located inside the T-shaped slot 302 is movably inserted into the limiting slot 214.

[0031] A method for using a rotary PIN structure for PCB back drilling processing, the method comprising the following steps: Step A: Place the PCB to be processed on the surface of the workbench 107 and make it close to the position of the fan-shaped PIN pin 301. Push the positioning plate 201 on the surface of the guide rail 104 by pushing the cylinder 109, so as to adjust the position of the fan-shaped PIN pin 301 inside the positioning waist hole 108, align the fan-shaped PIN pin 301 with the PIN hole to be back-drilled on the PCB, and slowly insert the top end of the fan-shaped PIN pin 301 into the inside of the PIN hole; Step B: After the fan-shaped PIN pin 301 is inserted into the PIN hole, the servo motor 204 drives the driving gear 208 to rotate, so that the driving gear 208 drives the driven gear 309 to rotate, and then the driven gear 309 drives the screw rod 303 to rotate. At this time, the adjusting ring 304 will move up and down on the surface of 30, so that the adjusting ring 304 pushes the four fan-shaped PIN pins 301, so that the fan-shaped PIN pins 301 move in four directions respectively, and then the fan-shaped PIN pins 301 located inside the PIN hole slowly approach the inner wall of the PIN hole, so that the PIN hole of the PCB board is clamped and positioned by the fan-shaped PIN pin 301, so as to avoid the situation that the PCB board shakes during the back drilling process and causes the production of defective products, so that the device can adapt to PIN holes of different sizes for clamping; Step C: After the back drilling process is completed, the adjusting ring 304 is driven to rise and fall again by the screw rod 303, so that the adjusting ring 304 no longer limits the inner wall of the fan-shaped PIN nail 301. At this time, the movable arc plate 209 is pushed by the elastic potential energy of the compression spring 212 to drive the fan-shaped PIN nail 301 to move inward, so that the four fan-shaped PIN nails 301 return to the initial state, which is convenient for clamping and positioning the PIN holes of the remaining PCB boards; Step D: When the PIN nail main body mechanism 3 needs to be removed for replacement and maintenance, first remove the connecting shaft 206, separate the positioning plate 201 and the positioning platform 203, and then use your hands to pull the special-shaped limit rods 305 on both sides of the surface of the fan-shaped PIN nail 301 to both sides, so that the special-shaped limit rods 305 move to the internal position of the PIN nail inner groove 307. At this time, the special-shaped limit rods 305 no longer limit the T-shaped snap buckle 213, so that the fan-shaped PIN nail 301 can be pulled outward from the clamping hole 207, thereby completing the replacement and maintenance of the fan-shaped PIN nail 301.

[0032] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A rotary PIN structure for PCB back drilling, comprising a housing mechanism (1), characterized in that: Two positioning mechanisms (2) are provided inside the housing mechanism (1), and a PIN main body mechanism (3) is provided inside each of the positioning mechanisms (2); The PIN main body mechanism (3) comprises a fan-shaped PIN (301), a T-shaped slot (302), a screw (303) and an adjustment ring (304). The four fan-shaped PINs (301) are all movably mounted inside the positioning mechanism (2). The four fan-shaped PINs (301) are spliced ​​together to form a cylindrical shape. The bottom of each fan-shaped PIN (301) is provided with a T-shaped slot (302). The inner side of the fan-shaped PIN (301) is movably mounted with a screw (303). The outer surface of the screw (303) is connected to the adjustment ring (304) by a thread. The outer surface of the adjustment ring (304) is provided with an inclined surface. The inner wall surface of the fan-shaped PIN (301) is provided with an inclined surface having the same slope as the inclined surface of the outer surface of the adjustment ring (304). The outer surface of the adjustment ring (304) is in contact with the inner wall surface of the fan-shaped PIN (301).

2. The rotary PIN structure for PCB back drilling according to claim 1, characterized in that: The PIN main body mechanism (3) further comprises a special-shaped limiting rod (305), a PIN outer groove (306), a PIN inner groove (307), a pressing spring (308) and a driven gear (309). The outer surface of the fan-shaped PIN (301) is provided with two PIN outer grooves (306), the interior of the PIN outer groove (306) is provided with a PIN inner groove (307), the interior of the PIN inner groove (307) is movably mounted with a special-shaped limiting rod (305), one end of the special-shaped limiting rod (305) extends to the outside of the PIN outer groove (306), the other end of the special-shaped limiting rod (305) extends to the inside of the T-shaped groove (302), a plurality of pressing springs (308) are movably mounted between the special-shaped limiting rod (305) and the interior of the PIN inner groove (307), and the bottom end of the screw rod (303) is fixedly connected with a driven gear (309).

3. The rotary PIN structure for PCB back drilling according to claim 2, characterized in that: The housing mechanism (1) comprises a base (101), a fixed platform (102), a support plate (103), a guide rail (104) and a sliding block (105); the top end of the base (101) is rigidly connected to the fixed platform (102); the top end of the fixed platform (102) is fixedly mounted with the guide rail (104); the outer surface of the guide rail (104) is slidably mounted with a sliding block (105); and the top end surface of the fixed platform (102) is fixedly mounted with a plurality of support plates (103).

4. The rotary PIN structure for PCB back drilling according to claim 3, characterized in that: The housing mechanism (1) further comprises a fixing plate (106), a workbench (107), a positioning waist hole (108) and a pushing cylinder (109); both sides of the top end of the support plate (103) are rigidly connected to the workbench (107); a fixing plate (106) is movably installed between the two workbench (107); a positioning waist hole (108) is provided on the surface of the fixing plate (106); and a pushing cylinder (109) is slidably installed on the surface of the guide rail (104).

5. The rotary PIN structure for PCB back drilling according to claim 4, characterized in that: The positioning mechanism (2) comprises a positioning plate (201), a pushing groove (202), a positioning platform (203), a servo motor (204), a support spring (205) and a connecting shaft (206); the positioning plate (201) is mounted on the top surface of the sliding block (105) by means of bolts; a connecting shaft (206) is movably mounted on the top of the positioning plate (201); a positioning platform (203) is movably connected to the end of the connecting shaft (206); two support springs (205) are movably mounted between the positioning plate (201) and the positioning platform (203); a pushing groove (202) is provided on one side of the positioning plate (201); an assembly groove is provided on the other side of the positioning plate (201); a servo motor (204) is provided inside the assembly groove.

6. The rotary PIN structure for PCB back drilling according to claim 5, characterized in that: The positioning mechanism (2) further comprises a clamping hole (207) and a driving gear (208); the output end of the servo motor (204) is connected to the driving gear (208) via a coupling; the driving gear (208) is rotatably connected to the inner wall surface of the assembly groove; a clamping hole (207) is provided on one side of the positioning platform (203) close to the assembly groove; and two layers of clamping mechanisms are movably mounted on the inner wall surface of the clamping hole (207).

7. The rotary PIN structure for PCB back drilling according to claim 6, characterized in that: The clamping mechanism comprises a movable arc plate (209), a spring groove (210), a movable rod (211), a compression spring (212), a T-shaped snap buckle (213) and a limiting groove (214). Each layer of the clamping mechanism is provided with four movable arc plates (209). The outer surface of the movable arc plate (209) is fixedly mounted with a movable rod (211). The inner wall surface of the positioning platform (203) is provided with a spring groove (210) near the clamping mechanism. The movable rod (211) is movably inserted into the spring groove (210). A compression spring (212) is movably mounted between the movable rod (211) and the spring groove (210). The inner surfaces of the four movable arc plates (209) near the bottom are fixedly mounted with a T-shaped snap buckle (213). The two end surfaces of the T-shaped snap buckle (213) are provided with limiting grooves (214).

8. The rotary PIN structure for PCB back drilling according to claim 7, characterized in that: The driven gear (309) is rotatably connected to the inner wall surface of the assembly groove, the driven gear (309) is meshingly connected to the driving gear (208), the top end of the T-shaped groove (302) movably penetrates the interior of the positioning waist hole (108), and the output end of the pushing cylinder (109) movably snaps into the interior of the pushing groove (202).

9. The rotary PIN structure for PCB back drilling according to claim 7, characterized in that: The fan-shaped PIN pin (301) is movably installed inside the clamping hole (207), the movable arc plate (209) is in contact with the outer surface of the fan-shaped PIN pin (301), the T-shaped snap-fit ​​buckle (213) is movably inserted into the T-shaped slot (302), and one end of the special-shaped limiting rod (305) located inside the T-shaped slot (302) is movably inserted into the limiting slot (214).

10. A method for using the rotary PIN structure for PCB back drilling according to any one of claims 1 to 9, characterized in that: The method of use comprises the following steps: Step A: placing the PCB to be processed on the surface of the workbench (107) and bringing it close to the position of the fan-shaped PIN pin (301), pushing the positioning plate (201) on the surface of the guide rail (104) by pushing the cylinder (109), thereby adjusting the position of the fan-shaped PIN pin (301) located inside the positioning waist hole (108), aligning the fan-shaped PIN pin (301) with the PIN hole to be back-drilled on the PCB, and slowly inserting the top end of the fan-shaped PIN pin (301) into the inside of the PIN hole; Step B: After the fan-shaped PIN pin (301) is inserted into the PIN hole, the servo motor (204) drives the driving gear (208) to rotate, so that the driving gear (208) drives the driven gear (309) to rotate, and then the driven gear (309) drives the screw rod (303) to rotate. At this time, the adjusting ring (304) moves up and down on the surface of 30, so that the adjusting ring (304) pushes the four fan-shaped PIN pins (301) to move the fan-shaped PIN pins (301) in four directions, so that the fan-shaped PIN pins (301) located inside the PIN hole slowly approach the inner wall of the PIN hole, so that the PIN hole of the PCB board is clamped and positioned by the fan-shaped PIN pin (301), so as to avoid the situation where the PCB board shakes during the back drilling process and causes the production of defective products, so that the device can adapt to PIN holes of different sizes for clamping; Step C: After the back drilling process is completed, the adjusting ring (304) is driven to rise and fall again by the screw rod (303), so that the adjusting ring (304) no longer limits the inner wall of the fan-shaped PIN pin (301). At this time, the movable arc plate (209) is pushed by the elastic potential energy of the compression spring (212) to drive the fan-shaped PIN pin (301) to move inward, so that the four fan-shaped PIN pins (301) return to the initial state, which is convenient for clamping and positioning the PIN holes of the remaining PCB boards; Step D: When the PIN main body (3) needs to be removed for replacement and maintenance, the connecting shaft (206) is first removed, and after the positioning plate (201) and the positioning platform (203) are separated, the special-shaped limiting rods (305) on both sides of the surface of the fan-shaped PIN (301) can be manually moved to both sides, so that the special-shaped limiting rods (305) are moved to the inner position of the PIN inner groove (307). At this time, the special-shaped limiting rods (305) no longer limit the T-shaped snap buckle (213), so that the fan-shaped PIN (301) can be pulled outward from the clamping hole (207), thereby completing the replacement and maintenance of the fan-shaped PIN (301).

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