Lower die device of PCB inner layer punching machine

Abstract

According to the lower die device of the PCB inner layer punching machine, symmetrical double-row punching holes are formed in a lower die plate, the front face and the back face of the lower die plate can be turned over to be used for four times, and therefore the service life of the lower die plate is prolonged; when the lower die plate needs to be turned over for use, bolts at the two ends of the lower die plate are detached, a holding rod is pulled downwards to drive a sliding rod through a U-shaped connecting rod to downwards compress a spring along a vertical sliding groove, and then a locking rod is driven to downwards slide out of a locking hole in the lower die plate; then the lower die plate is pulled out of a mounting sliding groove in the die plate mounting base through a pull ring at one end of the lower die plate, the lower die plate slides into the mounting sliding groove again after being turned over, and when the locking rod is aligned with the locking hole, the spring abuts against the sliding rod upwards to drive the locking rod to slide upwards to be inserted into the locking hole, so that the lower die plate is locked into the mounting sliding groove; and then the lower die plate and the die plate mounting seat are fixedly connected through the hexagon socket cap screws, and in the disassembly and assembly operation, the number of bolts needing to be disassembled and assembled is small, so that time and labor are saved.

Description

Technical Field

[0001] The present application relates to the technical field of PCB inner layer punching, and in particular to a lower mold device of a PCB inner layer punching machine. Background Art

[0002] With the rapid development of electronic technology, the application scope of printed circuit boards (PCBs) continues to expand. As the carrier of electronic components, the processing quality of PCBs directly affects the performance and reliability of electronic products. Punching is an essential step in the PCB processing process, and a punching machine is usually required to accurately punch the PCB board.

[0003] In the prior art, a PCB board is usually placed on the lower template of a lower punch die, and the PCB board is punched by the upper punch die above it. The lower template of the lower punch die is usually provided with a row of punch holes, which are located just below the punching position and are prone to wear due to frequent use. When a certain punch hole is damaged, the prior art usually allows the lower template to be turned over for continued use. Although this method can extend the service life of the template, its number of uses is still limited and can only be turned over and used twice. In addition, when the service life of the lower template is exhausted, the user often needs to replace the entire template, which invisibly increases the production cost; in addition, the lower template is usually fixedly connected to the lower mold base by multiple bolts. When the lower template needs to be turned over for use or removed for cleaning, all the bolts must be removed and reinstalled. This operation is not only time-consuming and labor-intensive, but also affects production efficiency to a certain extent. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this application is to provide a lower mold device of a PCB inner layer punching machine to solve the problems raised in the above background technology.

[0005] The top of the mold base is provided with a groove, and the top of the mold base is provided with a groove. The groove is provided with a template mounting seat. The top of the mold base is provided with a mounting slide along the length direction of the template mounting seat. The lower template is slidably installed in the mounting slide. The lower template is provided with a plurality of punching holes, and the plurality of punching holes are symmetrically distributed in a double row of holes along the length direction of the lower template. Each of the punching holes passes through the upper and lower surfaces of the lower template, each of the punching holes is straight and has the same inner diameter from top to bottom. Both ends of the lower template are fixedly connected to the template mounting seat by bolts, and a through hole is formed on the bottom of the mounting slide corresponding to each punching position, and a blanking hole is formed on the bottom of the groove corresponding to each through hole position. The punching hole and the corresponding through hole and the corresponding blanking hole coincide with the axis of the groove bottom of the groove. The top of the mold base is provided with a longitudinal limit strip fixedly mounted on the top of the mold base at both sides of the groove, and the inner side edge of the longitudinal limit strip extends above the groove, and the bottom surface of the longitudinal limit strip contacts the top surface of the extended bosses provided on both sides of the mold base to play a longitudinal limiting role on the mold base, and the length direction of the longitudinal limit strip is consistent with the length direction of the groove, and the side walls of the mold base at both ends of the groove are fixedly mounted with transverse limit plates, which extend upward to the opening position of the groove and contact the end surface of the template mounting seat to play a transverse limiting role on the template mounting seat.

[0006] Preferably, the limiting assembly includes two sliding rods, the two sliding rods are vertically symmetrically arranged, a locking rod is vertically fixed to the top of each sliding rod, the bottom end of each sliding rod is in conflict with the upper end of the spring, the upper part of the rod body of the two sliding rods is fixedly connected to the two end parts of the U-shaped connecting rod respectively, and a grip rod is horizontally fixed to the middle part of the U-shaped connecting rod.

[0007] Preferably, the accommodating groove includes two vertical slide grooves, the two vertical slide grooves are symmetrically arranged, the top of each vertical slide groove is connected to the groove, and an open groove is provided on one side of each vertical slide groove along its axial direction. The two sides of the open groove along the length direction of the groove are respectively connected to the vertical slide groove and the side wall of the mold base, and the top of the open groove is connected to the groove, and a sliding hole is provided through the template mounting seat corresponding to each vertical slide groove position, and a locking hole is provided through the lower template corresponding to each vertical slide groove position, and the axes of the vertical slide groove, the corresponding locking hole and the corresponding sliding hole coincide with each other.

[0008] Preferably, the two sliding rods are respectively slidably arranged in the two vertical sliding grooves, and the diameter of the sliding rod is consistent with the inner diameter of the vertical sliding groove, and the two side rods of the U-shaped connecting rod are respectively slidably arranged in the two open grooves, the two springs are respectively vertically placed at the bottom of the two vertical sliding grooves, and the bottom of the sliding rod is supported by the upper end of the spring, the diameter of the locking rod is smaller than the diameter of the sliding rod, and the locking rod slides through the sliding hole and the locking hole in sequence, and the diameter of the locking rod is consistent with the inner diameter of the vertical sliding groove. The inner diameters of the sliding hole and the locking hole are consistent. When the lower template is locked, the spring pushes the sliding rod upward so that its top end contacts the bottom surface of the template mounting seat, and the top end surface of the locking rod is flush with the upper surface of the lower template. When the use surface of the lower template is replaced, the screws at both ends of the lower template are removed, and the grip rod is pulled downward to drive the sliding rod through the U-shaped connecting rod along the vertical slide groove to compress the spring, thereby driving the locking rod to slide down and out of the locking hole, and replace the use surface of the lower template.

[0009] Preferably, the cross-section of the mounting groove is a T-shaped structure, the cross-section of the lower template is an I-shaped structure, and the upper and lower halves of the lower template are symmetrically arranged, and the shapes and dimensions of the upper and lower halves of the lower template are compatible with the shapes and dimensions of the mounting groove.

[0010] Preferably, both end surfaces of the lower template are horizontally fixed with pull rings.

[0011] Preferably, the inner diameter of the blanking hole is greater than or equal to the inner diameter of the through hole, and the inner diameter of the through hole is greater than the inner diameter of the punching hole.

[0012] Preferably, the longitudinal limit bar is fixedly connected to the top surface of the mold base by a hexagonal cylindrical head screw, the transverse limit plate is fixedly connected to the side surface of the mold base by a hexagonal cylindrical head screw, and the two ends of the lower template are fixedly connected to the template mounting seat by a hexagonal cylindrical head screw.

[0013] The advantages of the present application over the prior art are as follows: a lower mold device of a PCB inner layer punching machine of the present application has a symmetrical double-row punching hole set on the lower template, so when a punching hole in one row is damaged, it can be replaced with the other row of punching holes for continued use; when the row of punching holes is damaged again, the lower template is turned over and the two rows of punching holes on the other side are continued to be used, so that the lower template can be turned over and used four times, thereby increasing the service life of the lower template; in addition, through the sliding installation of the lower template and the template mounting seat and the setting of the limit assembly, when the lower template needs to be turned over for use or cleaning, the hexagonal cylindrical head screws at both ends of the lower template are first removed. The nail is removed, and then the grip rod is pulled downward to drive the sliding rod along the vertical slide groove through the U-shaped connecting rod to compress the spring, thereby driving the locking rod to slide down and out of the locking hole on the lower template, and then the lower template is pulled out of the mounting slide groove on the template mounting seat through the pull ring at one end of the lower template, and the lower template is turned over and slided back into the mounting slide groove. When the locking rod is aligned with the locking hole, the spring at the bottom of the vertical slide groove pushes the sliding rod upward and drives the locking rod to slide upward and insert into the locking hole, so that the lower template is locked to the mounting slide groove, and then the lower template and the template mounting seat are fixedly connected by the hexagon socket head screw. In this disassembly and assembly operation, fewer bolts are required to be disassembled and assembled, saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a three-dimensional diagram of a lower mold device of a PCB inner layer punching machine according to an embodiment of the present application.

[0015] Figure 2 This is a three-dimensional disassembled diagram of a lower mold device of a PCB inner layer punching machine according to an embodiment of the present application.

[0016] Figure 3 This is a top view of a lower mold device of a PCB inner layer punching machine according to one embodiment of the present application.

[0017] Figure 4 This is a side view of a lower mold device of a PCB inner layer punching machine according to an embodiment of the present application.

[0018] Figure 5 This is a side sectional view of a punching portion of a lower mold device of a PCB inner layer punching machine according to one embodiment of the present application.

[0019] Figure 6 It is a side sectional view of a limiting assembly during locking of a lower mold device of a PCB inner layer punching machine according to one embodiment of the present application.

[0020] Figure 7 This is a side sectional view of a limiting assembly of a lower mold device of a PCB inner layer punching machine when sliding out according to an embodiment of the present application.

[0021] Figure 8 This is a three-dimensional diagram of the lower template of the lower mold device of a PCB inner layer punching machine according to one embodiment of the present application when it is turned over for use.

[0022] Figure markings: 1. mold base; 2. template mounting seat; 3. lower template; 4. limit assembly; 41. sliding rod; 42. locking rod; 43. spring; 44. U-shaped connecting rod; 45. grip rod; 5. accommodating groove; 51. vertical slide groove; 52. opening groove; 53. sliding hole; 54. locking hole; 6. groove; 7. mounting slide groove; 8. punching hole; 9. through hole; 10. blanking hole; 11. longitudinal limit strip; 12. transverse limit plate; 13. pull ring. DETAILED DESCRIPTION

[0023] In order to make the content of this application easier to understand, the technical solutions in the embodiments of this application will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of this application. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the attached drawings. Figure 1 As used herein, the terms "inward" and "outward" refer to directions toward and away from, respectively, the geometric center of the particular component.

[0024] like Figures 1 to 8 As shown, a lower mold device of a PCB inner layer punching machine includes a mold base 1, a template mounting seat 2, a lower template 3 and a limit assembly 4. A groove 6 is opened on the top surface of the mold base 1 along its length direction, and a template mounting seat 2 is installed in the groove 6. The template mounting seat 2 is provided with extended bosses on both sides of the groove 6. The top surface of the mold base 1 is fixed with longitudinal limit strips 11 at positions on both sides of the groove 6 by hexagonal cylindrical head screws. The inner side of the longitudinal limit strip 11 extends above the groove 6, and the bottom surface of the longitudinal limit strip 11 contacts the top surface of the extended bosses provided on both sides of the template mounting seat 2. The length direction is consistent with the length direction of the groove 6. The setting of the longitudinal limit strip 11 can play a longitudinal limiting role on the template mounting seat 2, and thus can lock the longitudinal position of the template mounting seat 2; the side walls of the mold base 1 at both ends of the groove 6 are fixed with transverse limit plates 12 by hexagonal cylindrical head screws, and the transverse limit plates 12 extend upward to the opening position of the groove 6 and contact the end face of the template mounting seat 2. The setting of the transverse limit plate 12 can play a transverse limiting role on the template mounting seat 2, and thus can lock the transverse position of the template mounting seat 2, so that the template mounting seat 2 can be fixedly installed on the mold base 1.

[0025] An installation slot 7 is provided on the top surface of the template mounting seat 2 along its length direction. The cross-section of the installation slot 7 is a T-shaped structure. The lower template 3 is slidably installed in the installation slot 7. The cross-section of the lower template 3 is an I-shaped structure, and the upper and lower half structures of the lower template 3 are symmetrically arranged, and the shapes and dimensions of the upper and lower halves of the lower template 3 are adapted to the shapes and dimensions of the installation slot 7, so that the front and back sides of the lower template 3 can be adaptively slidably installed in the installation slot 7 after turning over; in addition, both end surfaces of the lower template 3 are horizontally fixed with pull rings 13, and the setting of the pull rings 13 can facilitate pushing and pulling the lower template 3 in the installation slot 7.

[0026] The lower template 3 is provided with a plurality of punching holes 8, and the plurality of punching holes 8 are symmetrically distributed in a double row along the length direction of the lower template 3. Each punching hole 8 passes through the upper and lower surfaces of the lower template 3. Each punching hole 8 is a straight cylinder and its inner diameter is the same from top to bottom. This setting allows both ends of the punching hole 8 to be used in the same way. The design of the symmetrical double-row punching holes 8 allows for when a punching hole 8 in one row of punching holes 8 is damaged, it can be replaced with another row of punching holes 8 for continued use. When the row of punching holes 8 is damaged again, the lower template 3 is turned over and the two rows of punching holes 8 on the other side are continued to be used, thereby allowing the lower template 3 to be turned over and used 4 times, thereby increasing the service life of the lower template 3; both ends of the lower template 3 are fixedly connected to the template mounting base 2 by hexagonal cylindrical head screws. This setting The arrangement of the lower template 3 slidingly installed in the mounting slot 7 enables the lower template 3 to be fixedly connected to the template mounting seat 2; in addition, a through hole 9 is provided on the bottom of the mounting slot 7 corresponding to each punching hole 8, and a blanking hole 10 is provided on the bottom of the groove 6 corresponding to each through hole 9. The axes of the punching hole 8, the corresponding through hole 9 and the corresponding blanking hole 10 coincide with each other, and the inner diameter of the blanking hole 10 is greater than or equal to the inner diameter of the through hole 9, and the inner diameter of the through hole 9 is greater than the inner diameter of the punching hole 8. The through hole 9 provided below the punching hole 8 can prevent the punching needle from over-punching and damaging the template mounting seat 2 after passing through the punching hole 8, and the blanking hole 10 provided below it can discharge the waste chips after the punching needle punches the PCB board from the through hole 9 and the blanking hole 10.

[0027] A receiving groove 5 is provided on the bottom of the groove 6 near the opening at one end, and an elastic limiting assembly 4 is installed in the receiving groove 5; specifically, the limiting assembly 4 includes two sliding rods 41, and the two sliding rods 41 are vertically symmetrically arranged. The top of each sliding rod 41 is vertically fixed with a locking rod 42, and the bottom end of each sliding rod 41 is in conflict with the upper end of the spring 43. The upper part of the rod body of the two sliding rods 41 is fixedly connected to the two end parts of the U-shaped connecting rod 44 respectively, and the middle part of the U-shaped connecting rod 44 is horizontally fixed with a grip rod 45; in addition, the receiving groove 5 includes two vertical slide grooves 51, and the two vertical slide grooves 51 are symmetrically arranged. The top of each vertical slide 51 is connected to the groove 6, and an open groove 52 is opened on one side of each vertical slide 51 along its axial direction. The two sides of the open groove 52 along the length direction of the groove 6 are respectively connected to the vertical slide 51 and the side wall of the mold base 1, and the top of the open groove 52 is connected to the groove 6. The length of the open groove 52 is smaller than the length of the vertical slide 51. This arrangement facilitates the placement of the spring 43 at the bottom of the vertical slide 51; a sliding hole 53 is opened at the position corresponding to each vertical slide 51 on the template mounting seat 2, and a locking hole 54 is opened at the position corresponding to each vertical slide 51 on the lower template 3. The axes of the groove 51, the corresponding locking hole 54 and the corresponding sliding hole 53 coincide with each other; in the specific design, the two sliding rods 41 are respectively slidably arranged in the two vertical sliding grooves 51, and the diameter of the sliding rod 41 is consistent with the inner diameter of the vertical sliding groove 51, and the two side rods of the U-shaped connecting rod 44 are respectively slidably arranged in the two open grooves 52, and the two springs 43 are respectively placed vertically at the bottom of the two vertical sliding grooves 51, and the bottom of the sliding rod 41 is supported by the upper end of the spring 43, the diameter of the locking rod 42 is smaller than the diameter of the sliding rod 41, and the locking rod 42 slides through the sliding hole 53 and the locking hole 54 in turn, and the locking rod 42 is locked. The diameter of the fixed rod 42 is consistent with the inner diameter of the sliding hole 53 and the locking hole 54. When the lower template 3 is locked, the spring 43 pushes the sliding rod 41 upward so that its top end contacts the bottom surface of the template mounting seat 2, preventing the sliding rod 41 from sliding out of the vertical slide groove 51, and the top end surface of the locking rod 42 is flush with the upper surface of the lower template 3. When the lower template 3 is replaced, the screws at both ends of the lower template 3 are removed, and the grip rod 45 is pulled downward to drive the sliding rod 41 along the vertical slide groove 51 through the U-shaped connecting rod 44 to compress the spring 43, thereby driving the locking rod 42 to slide down out of the locking hole 54 and replace the use surface of the lower template 3.

[0028] The method for installing the limit assembly 4 into the accommodating groove 5 is as follows: first, place the two springs 43 at the bottom of the two vertical slide grooves 51 respectively, then slide the two sliding rods 41 into the two vertical slide grooves 51 respectively, and the two side rods of the U-shaped connecting rod 44 slide into the two open grooves 52 respectively, and the bottom end of the sliding rod 41 conflicts with the upper end of the spring 43, then place the template mounting seat 2 into the groove 6 and align the locking rod 42 and insert it into the sliding hole 53, then fix the longitudinal limit strip 11 to the top surface of the mold base 1 by the hexagon socket head screw, and fix the transverse limit plate 12 to the mold base 1 by the hexagon socket head screw The side is fixedly connected, and then the grip rod 45 is pulled downward to drive the sliding rod 41 through the U-shaped connecting rod 44 to compress the spring 43 along the vertical slide groove 51, thereby driving the locking rod 42 to slide downward, and then the lower template 3 is slid and installed in the installation slide groove 7. When the locking rod 42 is aligned with the locking hole 54, the spring 43 at the bottom of the vertical slide groove 51 pushes the sliding rod 41 upward and drives the locking rod 42 to slide upward and insert into the locking hole 54, and the top surface of the locking rod 42 is flush with the upper surface of the lower template 3, so that the lower template 3 is locked into the installation slide groove 7, and then the lower template 3 and the template mounting base 2 are fixedly connected by the hexagonal cylindrical head screw.

[0029] In summary, it can be seen that by setting the symmetrical double rows of punching holes 8 on the lower template 3, when a punching hole 8 in one row of punching holes 8 is damaged, it can be replaced with the other row of punching holes 8 for continued use. When the row of punching holes 8 is damaged again, the lower template 3 is turned over and the two rows of punching holes 8 on the other side are continued to be used, so that the lower template 3 can be turned over and used four times, thereby improving the service life of the lower template 3; in addition, by the sliding installation of the lower template 3 and the template mounting seat 2 and the setting of the limit assembly 4, when the lower template 3 needs to be turned over for use or cleaning, the hexagon socket head screws at both ends of the lower template 3 are first removed, and then the gripping rod 45 is pulled downward to drive the sliding rod through the U-shaped connecting rod 44. 41 compresses the spring 43 downward along the vertical slide groove 51, thereby driving the locking rod 42 to slide down and out of the locking hole 54 on the lower template 3, and then pulls the lower template 3 out of the mounting slide groove 7 on the template mounting seat 2 through the pull ring 13 at one end of the lower template 3, and turns the lower template 3 over and slides it back into the mounting slide groove 7. When the locking rod 42 is aligned with the locking hole 54, the spring 43 at the bottom of the vertical slide groove 51 pushes the sliding rod 41 upward and then drives the locking rod 42 to slide upward and insert into the locking hole 54, so that the lower template 3 is locked into the mounting slide groove 7, and then the lower template 3 and the template mounting seat 2 are fixedly connected by the hexagon socket head screw. In this disassembly and assembly operation, fewer bolts are required for disassembly and assembly, saving time and effort.

[0030] The above embodiments are intended only to illustrate the technical solutions of the embodiments of the present application and are not intended to limit them. Although the embodiments of the present application have been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that, without departing from the spirit and scope defined by the claims of the present application, they may still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents.

Claims

1. A lower die device for a PCB inner layer punching machine, comprising a die base (1), a die mounting seat (2), a lower die plate (3) and a limit assembly (4), characterized in that: A groove (6) is provided on the top surface of the mold base (1) along its length direction, a template mounting seat (2) is installed in the groove (6), a mounting slot (7) is provided on the top surface of the template mounting seat (2) along its length direction, a lower template (3) is slidably installed in the mounting slot (7), a plurality of punching holes (8) are provided on the lower template (3), and the plurality of punching holes (8) are symmetrically distributed in double rows along the length direction of the lower template (3), each punching hole (8) passes through the upper and lower surfaces of the lower template (3), and each punching hole (8) is a straight cylinder. The bottom of the groove (6) is provided with a through hole (9) corresponding to each of the punching holes (8). The bottom of the groove (6) is provided with a blanking hole (10) corresponding to each of the through holes (9). The axes of the punching holes (8) and the corresponding through holes (9) and the corresponding blanking holes (10) coincide with each other. The bottom of the groove (6) is provided with a receiving groove (5) near the opening of one end. The receiving groove ( 5) is provided with an elastically arranged limit assembly (4), the upper end of the limit assembly (4) slides through the template mounting seat (2) and the lower template (3) in sequence and its upper end surface is flush with the upper surface of the lower template (3), when the lower template (3) is replaced with a use surface, the limit assembly (4) can be elastically moved downward so that its upper end slides downward out of the lower template (3), and longitudinal limit strips (11) are fixedly installed on the top surface of the mold base (1) at positions on both sides of the groove (6), and the inner side edge of the longitudinal limit strip (11) extends to above the groove (6), and The bottom surface of the longitudinal limit strip (11) contacts the top surfaces of the extended bosses provided on both sides of the template mounting seat (2) to play a longitudinal limiting role on the template mounting seat (2); the length direction of the longitudinal limit strip (11) is consistent with the length direction of the groove (6); transverse limit plates (12) are fixedly installed on the side walls of the mold base (1) at both ends of the groove (6); the transverse limit plates (12) extend upward to the opening position of the groove (6) and contact the end surface of the template mounting seat (2) to play a transverse limiting role on the template mounting seat (2).

2. The lower die device of a PCB inner layer punching machine according to claim 1, characterized in that: The limiting assembly (4) includes two sliding rods (41), the two sliding rods (41) are vertically symmetrically arranged, the top of each sliding rod (41) is vertically fixed with a locking rod (42), the bottom end of each sliding rod (41) is in contact with the upper end of a spring (43), the upper parts of the rod bodies of the two sliding rods (41) are respectively fixedly connected to the two ends of a U-shaped connecting rod (44), and the middle part of the U-shaped connecting rod (44) is horizontally fixed with a grip rod (45).

3. The lower die device of a PCB inner layer punching machine according to claim 2, characterized in that: The accommodating groove (5) includes two vertical slide grooves (51), and the two vertical slide grooves (51) are symmetrically arranged. The top of each vertical slide groove (51) is connected to the groove (6). An open groove (52) is provided on one side of each vertical slide groove (51) along its axial direction. The open groove (52) is connected to the vertical slide groove (51) and the side wall of the mold base (1) on both sides along the length direction of the groove (6), and the top of the open groove (52) is connected to the groove (6). A sliding hole (53) is provided through the position corresponding to each vertical slide groove (51) on the template mounting seat (2), and a locking hole (54) is provided through the position corresponding to each vertical slide groove (51) on the lower template (3). The axes of the vertical slide groove (51), the corresponding locking hole (54) and the corresponding sliding hole (53) coincide with each other.

4. The lower die device of a PCB inner layer punching machine according to claim 3, characterized in that: The two sliding rods (41) are respectively slidably arranged in the two vertical sliding grooves (51), and the diameter size of the sliding rod (41) is consistent with the inner diameter size of the vertical sliding groove (51), and the two side rods of the U-shaped connecting rod (44) are respectively slidably arranged in the two open grooves (52), and the two springs (43) are respectively vertically placed at the bottom of the two vertical sliding grooves (51), and the bottom of the sliding rod (41) is supported by the upper end of the spring (43), the diameter size of the locking rod (42) is smaller than the diameter size of the sliding rod (41), and the locking rod (42) slides through the sliding hole (53) and the locking hole (54) in sequence, and the diameter size of the locking rod (42) is consistent with the inner diameter size of the sliding hole (53). The inner diameters of the movable hole (53) and the locking hole (54) are consistent. When the lower template (3) is locked, the spring (43) pushes the sliding rod (41) upward so that its top end contacts the bottom surface of the template mounting seat (2), and the top end surface of the locking rod (42) is flush with the upper surface of the lower template (3). When the use surface of the lower template (3) is replaced, the bolts at both ends of the lower template (3) are removed, and the gripping rod (45) is pulled downward to drive the sliding rod (41) along the vertical slide groove (51) through the U-shaped connecting rod (44) to compress the spring (43), thereby driving the locking rod (42) to slide down out of the locking hole (54) and replace the use surface of the lower template (3).

5. The lower die device of a PCB inner layer punching machine according to claim 1, characterized in that: The cross section of the installation slide groove (7) is a T-shaped structure, the cross section of the lower template (3) is an I-shaped structure, and the upper and lower halves of the lower template (3) are symmetrically arranged, and the shapes and dimensions of the upper and lower halves of the lower template (3) are both compatible with the shapes and dimensions of the installation slide groove (7).

6. The lower die device of a PCB inner layer punching machine according to claim 5, characterized in that: Both end surfaces of the lower template (3) are horizontally fixed with pull rings (13).

7. The lower die device of a PCB inner layer punching machine according to claim 1, characterized in that: The inner diameter of the blanking hole (10) is greater than or equal to the inner diameter of the through hole (9), and the inner diameter of the through hole (9) is greater than the inner diameter of the punching hole (8).

8. The lower die device of a PCB inner layer punching machine according to claim 1, characterized in that: The longitudinal limit strip (11) is fixedly connected to the top surface of the mold base (1) by means of hexagon socket head screws, the transverse limit plate (12) is fixedly connected to the side surface of the mold base (1) by means of hexagon socket head screws, and the two ends of the lower template (3) are fixedly connected to the template mounting seat (2) by means of hexagon socket head screws.

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