CN112911918B

CN112911918B - Printed circuit board for inhibiting electromagnetic interference

Info

Publication number: CN112911918B
Application number: CN202110112688.2A
Authority: CN
Inventors: 王建业; 甘颖燕; 李勇; 曹爱华; 许启超
Original assignee: Shenzhen Honglian Circuit Co ltd
Current assignee: Shenzhen Honglian Circuit Co ltd
Priority date: 2021-01-27
Filing date: 2021-01-27
Publication date: 2022-07-19
Anticipated expiration: 2041-01-27
Also published as: CN112911918A

Abstract

The application discloses a printed circuit board for inhibiting electromagnetic interference, which relates to a printed circuit board and improves the shielding effect of an electromagnetic shielding cover, and comprises a circuit board body and a shielding device arranged on the circuit board body and used for shielding electronic elements, wherein the shielding device comprises a rectangular frame which is in plug fit with the circuit board body and a shielding cover body which is connected with the rectangular frame and is electrically connected with the rectangular frame; the rectangle frame includes a pair of parallel long frame strip and a pair of parallel short frame strip, two the bottom of long frame strip is impartial interval and is provided with the dead lever of a plurality of perpendicular to long frame strip, set up the preformed hole that supplies the dead lever to pass on the circuit board body. This application can improve the shielding effect to electronic component through the setting of shield plate.

Description

Printed circuit board for inhibiting electromagnetic interference

Technical Field

The present invention relates to a printed circuit board, and more particularly, to a printed circuit board with electromagnetic interference suppression.

Background

Printed Circuit Boards (PCBs) currently have wide application in the electronics and telecommunications industry. Electromagnetic interference is one of the common problems of printed circuit boards, and generally, electronic components on the printed circuit boards generate electromagnetic waves during application, and the electromagnetic waves affect the transmission signals and the working performance of other electronic components.

Chinese patent application No. CN200920045599.5 in the related art discloses a printed circuit board device, which includes a printed circuit board body and an electromagnetic shielding case connected to the printed circuit board body, wherein the shielding case includes at least four side portions and a top portion, and the top portion and the side portions are detachably connected.

Although the electromagnetic shielding cover in the related art can provide a certain shielding function for the electronic component, the electromagnetic shielding cover cannot shield the electromagnetic waves emitted downward by the electronic component, and the shielding effect is poor.

Disclosure of Invention

In order to improve the shielding effect of the electromagnetic shielding case, the application provides a printed circuit board for inhibiting electromagnetic interference.

The application provides a printed circuit board for inhibiting electromagnetic interference, which adopts the following technical scheme:

a printed circuit board for inhibiting electromagnetic interference comprises a circuit board body and a shielding device arranged on the circuit board body and used for shielding electronic elements, wherein the shielding device comprises a rectangular frame which is in plug-in fit with the circuit board body and a shielding cover body which is jointed with the rectangular frame and is electrically connected with the rectangular frame; the rectangular frame comprises a pair of parallel long frame strips and a pair of parallel short frame strips, a plurality of fixing rods perpendicular to the long frame strips are arranged at the bottoms of the two long frame strips at equal intervals, and a reserved hole for the fixing rods to penetrate through is formed in the circuit board body;

the shielding device also comprises a shielding plate which is arranged on the back side of the circuit board body and is fixedly connected with the fixed rod; the shielding plate is provided with positioning holes for the fixed rods to penetrate through, a plurality of convex strips which are parallel to the short frame strips and extend towards the directions of two adjacent positioning holes are uniformly arranged in the middle of one side of the shielding plate, which is away from the circuit board body, at intervals, the number of the convex strips is the same as that of the fixed rods on one long frame strip, two insertion rods which move towards opposite directions or opposite directions along the length direction of the convex strips are symmetrically arranged in the convex strips, the fixed rods are provided with insertion holes for the insertion rods to be inserted, and the shielding plate is provided with a driving mechanism which is used for synchronously driving the insertion rods in each convex strip to extend out of the convex strips to be inserted into the corresponding insertion holes so that the shielding plate and the rectangular frame are tightly abutted against and fixed on the circuit board body.

Through adopting above-mentioned technical scheme, install the dorsal part at the circuit board body with the shield plate to order about the same butt of rectangle frame and shield plate through drive assembly and fix on the circuit board body, then close the cover lid of shielding on the rectangle frame, can make the shield plate and the indirect shielding cavity that forms including wrapping up electronic component of the cover of shielding, thereby improve the shielding effect to electronic component.

Preferably, the protruding strip is provided with a sliding groove for slidably connecting the two insertion rods, and the sliding groove penetrates through two sides of the protruding strip along the length direction of the protruding strip; the outer wall circumference of grafting pole is provided with protruding edge, the both ends of sand grip are seted up and are extended along sand grip length direction and supply protruding gliding spacing groove along the sand grip, the notch department of spacing groove is provided with the first spacing ring that prevents protruding edge and break away from the spacing groove, the cover is equipped with the protruding first spring of butt in the tank bottom of spacing groove so that the grafting pole totally takes in the spout of drive on the grafting pole, the one end butt of first spring in first spacing ring, other end butt in protruding edge.

Through adopting above-mentioned technical scheme, act on protruding edge through first spring, under the effect that does not have the external force, first spring can drive the peg graft pole and take in the spout completely to make things convenient for the dead lever to pass the locating hole of shield plate.

Preferably, the driving mechanism comprises linkage rods in a cuboid structure, through holes for the linkage rods to pass through are formed in the middle parts of the raised lines along the length direction perpendicular to the raised lines, a connecting plate is vertically arranged in the middle part of one side of the shielding plate, and connecting holes for the linkage rods to pass through are formed in the connecting plate; one end of the linkage rod is provided with a spine part for sliding the two insertion rods on the raised line; when the convex edges of the two insertion rods in the convex strips are abutted against the bottom of the limiting groove, a gap for the spine part to slide open the two insertion rods is formed between the two insertion rods; the outer side of one end of the linkage rod, which is far away from the spine part, is provided with a butting ring which is used for butting against the connecting plate when the linkage rod penetrates through all the raised strips to push the inserting rod to be inserted into the corresponding inserting hole; and a locking assembly used for fixing the linkage rod when the abutting ring abuts against the connecting plate is arranged between the connecting plate and the linkage rod.

By adopting the technical scheme, the linkage rods are inserted into the through holes, so that the two insertion rods in each raised line can be driven to extend out of the sliding grooves to be inserted into the insertion holes in the fixed rods, and therefore the rectangular frame and the shielding plate are fixedly connected, and the operation is convenient.

Preferably, the insertion rod is of a cuboid structure, a baffle is vertically connected to the edge, close to the positioning hole, of the outer side of the shielding plate, and a blocking groove for insertion of the insertion rod is formed in the baffle when the abutting ring abuts against the connecting plate.

Through adopting above-mentioned technical scheme, through the fender groove and the baffle that set up, when the inserted link inserted in keeping off the groove, can improve the tensile strength of inserted link.

Preferably, a groove is formed in one side, which is far away from one end of the through hole and close to the shielding plate, of the plug rod, and a top block which is opposite to the positioning hole when the plug rod abuts against the bottom of the blocking groove is connected in the groove in a sliding mode; one end of the insertion rod, which is far away from the baffle plate, is provided with a communicating hole which extends to be communicated with the side wall of the groove along the length direction of the insertion rod, a mandril which extends out of the groove is connected in the communicating hole in a sliding manner, and one end of the mandril, which is close to the jacking block, is obliquely provided with a squeezing surface which is used for pushing the jacking block out of the groove; the driving mechanism further comprises a driving component for pushing the ejector rod to move towards the direction of the ejector block so that the ejector block extends out of the groove and is tightly abutted against the wall of the plugging hole.

By adopting the technical scheme, under the action of the driving assembly, the ejector rod can push the ejector block to stretch out the groove to be abutted against the hole wall of the insertion hole and extrude the hole wall of the insertion hole, so that the ejector block generates abutting force along the axis direction of the fixed rod on the fixed rod, and when the rectangular frame and the shielding plate abut against the circuit board body together, the damage to the fixed rod is reduced.

Preferably, the driving assembly comprises a push block and a push rod, and a hollow groove which extends along the axis direction of the linkage rod and is used for the push rod to be in sliding connection is coaxially formed in the middle of one end, far away from the spine part, of the linkage rod; the outer side of the linkage rod is provided with a plurality of mounting holes which are positioned at the same axial position with the sliding groove when the abutting ring abuts against the connecting plate, the mounting holes are communicated with the empty groove, the push block is connected in the mounting holes in a sliding manner, a convex ring is arranged on the outer peripheral side of the push block, an annular groove which is coaxial with the mounting holes and is used for the sliding connection of the convex ring is arranged on the outer side of the linkage rod, a second limiting ring used for preventing the convex ring from being separated from the annular groove is arranged at the notch of the annular groove, a compression spring driving the push block to be contained in the annular groove is sleeved on the outer peripheral side of the push block, one end of the compression spring abuts against the second limiting ring, and the other end of the compression spring abuts against the convex ring; when the convex rings on the two push blocks at the same axial position are abutted to the bottom of the annular groove, the close ends of the two push blocks are abutted, one close side of the two push blocks is provided with a rounding surface, and the middle part of one end of the push rod is provided with a guide surface which inclines towards two sides and is used for pushing the push blocks to extend into the communicating holes and driving the ejector rods to push the push blocks to extend out of the grooves; the locking assembly comprises a first fixing state for fixing the linkage rod and a second fixing state for fixing the push rod.

Through adopting above-mentioned technical scheme, the in-process of dead slot is gone into to the push rod card, and the guide surface of push rod front end can with the radius face butt of ejector pad and slide out the ejector pad through the extruded mode for the ejector pad inserts in the intercommunicating pore and promotes the direction extrusion kicking block that the ejector pin inserted the recess, makes the kicking block stretch out outside the recess and forms the tight state of support with the pore wall of inserting groove.

Preferably, one end of the push rod, which is far away from the guide surface, is provided with a positioning block which is used for abutting against the end part of the linkage rod when the push rod pushes all the push blocks to extend into the communication hole; the locking assembly comprises a fastening bolt screwed on the connecting plate, a first fixing hole coaxial with the fastening bolt and used for inserting the fastening bolt when the abutting ring abuts against the connecting plate is formed in the linkage rod, and a second fixing hole coaxial with the first fixing hole and used for inserting the fastening bolt when the positioning block abuts against the end portion of the linkage rod is formed in the push rod.

By adopting the technical scheme, the fastening bolts are screwed into the first fixing holes and the second fixing holes, so that the push rod and the linkage rod can be fixed, and the operation is convenient.

Preferably, the protruding edgewise in the recess of sliding connection that has of one end periphery side of kicking block, the notch department of recess is equipped with the third spacing ring that prevents the edgewise and break away from the recess, the cover is equipped with and is used for promoting the second spring that the kicking block was received in the recess completely on the kicking block, the one end butt of second spring in the edgewise, the other end butt in the third spacing ring, the border on the edgewise has seted up the chamfer.

Through adopting above-mentioned technical scheme, through the setting of chamfer, can make things convenient for the ejector pin to promote the kicking block and stretch out outside the recess.

Preferably, one side of the frame, which is far away from the fixing rod, is provided with a clamping ring groove for interference clamping of the shielding cover body.

By adopting the technical scheme, the installation of the shielding cover body can be facilitated by the arrangement of the clamping ring groove.

In summary, the present application includes at least one of the following advantages:

1. the shielding plate is arranged, so that the shielding effect on the electronic element can be improved;

2. through the setting of joint annular, can make things convenient for the installation of the shield cover body.

Drawings

FIG. 1 is a schematic view of the overall structure of the present embodiment;

FIG. 2 is an overall exploded view of the present embodiment;

FIG. 3 is an exploded view of the embodiment embodying the connecting plate;

fig. 4 is a schematic structural view of the shield plate embodying the present embodiment;

FIG. 5 is a schematic sectional view of the rib of the present embodiment;

FIG. 6 is an enlarged schematic view at A in FIG. 5 of the present embodiment;

fig. 7 is an enlarged schematic view at B in fig. 6 of the present embodiment;

FIG. 8 is a schematic cross-sectional view of the linkage rod of the present embodiment;

fig. 9 is a schematic cross-sectional view of the embodiment embodying the threaded hole.

Description of reference numerals: 1. a circuit board body; 2. a rectangular frame; 3. a shielding cage body; 4. clamping the ring groove; 5. a long frame strip; 6. a short frame strip; 7. fixing the rod; 8. reserving a hole; 9. positioning holes; 10. a shielding plate; 11. a convex strip; 12. a plug rod; 13. inserting holes; 14. an electronic component; 15. a chute; 16. a convex edge; 17. a limiting groove; 18. a first limit ring; 19. a second stop collar; 20. a third limit ring; 21. a first spring; 22. a second spring; 23. a compression spring; 24. a linkage rod; 25. a spike portion; 26. a through hole; 27. a connecting plate; 28. connecting holes; 29. a butting ring; 30. a baffle plate; 31. a baffle groove; 32. a groove; 33. a top block; 34. an edge; 35. a communicating hole; 36. extruding surface; 37. a top rod; 38. a push rod; 39. a push block; 40. an empty groove; 41. mounting holes; 42. a convex ring; 43. a guide surface; 44. positioning blocks; 45. fastening a bolt; 46. a threaded hole; 47. a first fixing hole; 48. a second fixing hole; 49. and a ring groove.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

The embodiment of the application discloses a printed circuit board for inhibiting electromagnetic interference. Referring to fig. 1 and 2, the printed circuit board includes a circuit board body 1, and a shielding device is disposed on the circuit board body 1, and the shielding device can shield an electronic component 14 on the circuit board body 1.

Referring to fig. 1 and 2, the shielding apparatus includes a rectangular frame 2 provided on a circuit board body 1 and a shielding case 3 engaged with and electrically connected to the rectangular frame 2. The rectangular frame 2 can surround the electronic component 14 on the circuit board body 1, the shielding cover body 3 matched with the rectangular frame 2 can cover the electronic component 14, and the shielding cover body 3 can be a metal cover with the function of shielding electromagnetic waves.

Referring to fig. 1 and 2, the rectangular frame 2 includes a clamping ring groove 4 for providing interference clamping of the shielding cover body 3, and the lower edge of the shielding cover body 3 is clamped in the clamping ring groove 4, so that the shielded electronic element 14 can be conveniently replaced or maintained.

Referring to fig. 2 and 3, the rectangular frame 2 includes a pair of parallel long frame bars 5 and a pair of parallel short frame bars 6. Two rectangular frame strips 5 deviate from one side of joint annular 4 and all be provided with a plurality of dead levers 7 perpendicularly, and a plurality of dead levers 7 set up along the equidistant length direction of rectangular frame strip 5, and dead lever 7 is the cuboid structure. In the present embodiment, three fixing bars 7 are provided on each long frame strip 5 at equal intervals, but in other embodiments, four, five or even more fixing bars 7 may be provided.

Further, referring to fig. 2 and 3, the circuit board body 1 is provided with a preformed hole 8 for the fixing rod 7 to pass through, the shielding device further includes a shielding plate 10 installed on the back side of the circuit board body 1 and used for being connected with the fixing rod 7, and the shielding plate 10 is a metal plate capable of shielding electromagnetic waves. When the shielding plate 10 is fixed on the back side of the circuit board body 1, a shielding chamber for enclosing the electronic component 14 can be indirectly formed with the shielding case 3, thereby improving the shielding effect on the electronic component 14.

Referring to fig. 3 and 4, a positioning hole 9 for the fixing rod 7 to pass through is formed in the shielding plate 10, a plurality of protruding strips 11 parallel to the short frame strips 6 are arranged in the middle of one side of the shielding plate 10 away from the circuit board body 1 at equal intervals, and the number of the protruding strips 11 is three as the same as the number of the fixing rods 7 on the long frame strips 5. The protruding strips 11 extend toward two adjacent positioning holes 9. Two symmetrical plugging rods 12 are arranged in each convex strip 11, and the two plugging rods 12 can move towards opposite or opposite directions along the length direction of the convex strips 11. The outer wall of the fixed rod 7 is provided with an inserting hole 13 for inserting the inserting rod 12, and the inserting rod 12 in the convex strip 11 can move towards the opposite direction to the convex strip 11 to form inserting fixation with the inserting hole 13.

Referring to fig. 5 and 6, the protruding strip 11 is provided with a sliding slot 15 for slidably connecting the two insertion rods 12, and the sliding slot 15 penetrates from one end of the protruding strip 11 to the other end of the protruding strip 11 along the length of the protruding strip 11. The insertion rods 12 can extend out of the sliding grooves 15 to be inserted into the insertion holes 13. Insertion rod 12 is the cuboid structure, and insertion rod 12's outer wall circumference is provided with protruding edge 16, and the both ends of sand grip 11 have all been seted up and have been extended along 11 length direction of sand grip and supply protruding 16 sliding connection's spacing groove 17 along the sand grip. The notch of the limiting groove 17 is in interference fit with a first limiting ring 18 for preventing the insertion rod 12 from separating from the sliding groove 15. The insertion rod 12 is sleeved with a first spring 21, one end of the first spring 21 abuts against the first limiting ring 18, and the other end abuts against the protruding edge 16. Under the action of no external force, the first spring 21 can act on the convex edge 16, so that the convex edge 16 abuts against the bottom of the limiting groove 17, the insertion rod 12 is completely retracted into the sliding groove 15, and a gap is reserved between the two adjacent ends of the two insertion rods 12.

Referring to fig. 3 and 4, the shielding plate 10 is provided with a driving mechanism for synchronously driving the plugging rod 12 in each protruding strip 11 to extend out of the protruding strip 11 to be plugged into the plugging hole 13 on the opposite fixing rod 7. The driving mechanism comprises a linkage rod 24, the linkage rod 24 is of a cuboid structure, and a through hole 26 for the linkage rod 24 to pass through is formed in the middle of the convex strip 11. One end of the linkage rod 24 is provided with a spine portion 25, and when the linkage rod 24 is inserted into the through hole 26, the linkage rod 24 can push the two insertion rods 12 in the protruding strips 11 to synchronously extend out of the sliding groove 15 through the spine portion 25. When the linkage rod 24 finishes the penetration of each convex strip 11, all the insertion rods 12 can be inserted into the corresponding insertion rods 12.

Referring to fig. 3 and 4, a connecting plate 27 is vertically arranged in the middle of one side of the shielding plate 10, and a connecting hole 28 coaxial with the through hole 26 and used for the linkage rod 24 to be slidably connected is formed in the connecting plate 27. The outer periphery of one end of the linkage rod 24 far away from the spine part 25 is provided with a butting ring 29. When the linkage rod 24 passes through the through hole 26 of each rib 11, the abutting ring 29 abuts on the connecting plate 27, thereby forming the positioning of the linkage rod 24.

Referring to fig. 5 and 6, in order to improve the supporting strength of the insertion rod 12, a baffle 30 is vertically disposed at a position of the shielding plate 10 close to the positioning hole 9, a blocking groove 31 for inserting the insertion rod 12 is formed at a side of the baffle 30 close to the protruding strip 11, and the positioning hole 9 is located between the baffle 30 and the protruding strip 11. The inserting rod 12 can pass through the inserting hole 13 on the fixing rod 7 and be inserted into the blocking groove 31 to form fixation under the action of the linkage rod 24.

Referring to fig. 6 and 7, a groove 32 is formed in one side of the plugging rod 12, which is far away from one end of the through hole 26 and is close to the shielding plate 10, and a top block 33 is slidably connected in the groove 32. When the plugging rod 12 is inserted into the blocking slot 31, the top block 33 is located in the plugging hole 13 of the fixing rod 7, and the top block 33 faces the wall of the plugging hole 13.

Further, referring to fig. 6 and 7, a rim 34 slidably connected in the groove 32 is protruded on the outer peripheral side of one end of the top block 33 close to the bottom of the groove 32, and a third limiting ring 20 for preventing the rim 34 from being separated from the groove 32 is in interference fit with the notch of the groove 32. The second spring 22 for pushing the top block 33 to be completely received in the groove 32 is sleeved on the top block 33, one end of the second spring 22 abuts against the edge 34, and the other end abuts against the third limiting ring 20. Without the application of external force, the second spring 22 pushes the rim 34 to fully retract the top piece 33 into the recess 32.

Referring to fig. 6 and 7, a communication hole 35 extending to the side wall of the groove 32 along the length direction of the insertion rod 12 is formed in one end of the insertion rod 12 away from the baffle 30, an ejector rod 37 extending into the groove 32 is connected in the communication hole 35 in a sliding manner, and a pressing surface 36 used for pushing the ejector block 33 out of the groove 32 is obliquely arranged at one end of the ejector rod 37 close to the ejector block 33. The edge of the rim 34 is chamfered to mate with the pressing surface 36. The top rod 37 can press the chamfer of the edge 34 through the pressing surface 36, so as to drive the top block 33 to extend out of the groove 32 to generate a vertical downward pressing force on the fixing rod 7, thereby pressing the rectangular frame 2 and the shielding plate 10 against the circuit board body 1.

Referring to fig. 6 and 8, the driving mechanism further includes a driving component for pushing the push rod 37 to move toward the push block 33. The driving component comprises a push rod 38 and a push block 39, a hollow groove 40 extending along the axial direction of the linkage rod 24 is coaxially formed in the middle of one end of the linkage rod 24 far away from the spine portion 25, and the push rod 38 can be inserted into the hollow groove 40. The linkage rod 24 is provided with a plurality of mounting holes 41 which are coaxial with the sliding groove 15 when the abutting ring 29 abuts against the connecting plate 27. The mounting hole 41 is communicated with the empty groove 40, and the pushing block 39 is slidably connected in the mounting hole 41.

Further, referring to fig. 6 and 8, a convex ring 42 is disposed on the outer periphery of the pushing block 39, and a ring groove 49 coaxial with the mounting hole 41 and allowing the convex ring 42 to be slidably connected is disposed on the outer side of the linkage rod 24. The notch of the ring groove 49 is in interference fit with a second limit ring 19 for preventing the convex ring 42 from separating from the ring groove 49, the outer peripheral side of the push block 39 is sleeved with a compression spring 23, one end of the compression spring 23 abuts against the second limit ring 19, and the other end abuts against the convex ring 42. Without the external force, the compression spring 23 can push the push block 39 to be completely received in the mounting hole 41. When the convex rings 42 on the two pushing blocks 39 at the same axial position abut against the bottom of the circular groove 49, the ends of the two pushing blocks 39 close to each other extend into the hollow groove 40 to form abutting, and the abutting ends of the two pushing blocks 39 are provided with rounded corners.

Referring to fig. 6 and 8, the middle of one end of the push rod 38 is provided with a guide surface 43 inclined toward both sides. During the process of inserting the push rod 38 into the empty slot 40, the push rod 38 can contact with the rounded corner of the push block 39 through the guide surface 43 at the front end, and slide the push block 39 away by pressing, so that the push block 39 extends into the communication hole 35 to push the push rod 37 to move toward the groove 32, so that the push rod 37 pushes the push block 33 out of the groove 32 to form pressing with the hole wall of the inserting hole 13, thereby pressing the shielding plate 10 and the rectangular frame 2 against the circuit board body 1.

Referring to fig. 8 and 9, a positioning block 44 is welded at one end of the push rod 38 away from the guide surface 43, and when the push rod 38 is inserted into one end of the positioning block 44 abutting against the linkage rod 24, extrusion of all the push blocks 39 can be completed, so that each of the push blocks 33 abuts against the wall of the corresponding insertion hole 13.

Referring to fig. 8 and 9, a locking assembly for fixing the linkage rod 24 and the push rod 38 is disposed between the connecting plate 27 and the linkage rod 24, and the locking assembly includes a first fixing state for fixing the linkage rod 24 and a second fixing state for fixing the push rod 38.

Referring to fig. 8 and 9, the locking assembly includes a fastening bolt 45, and one end of the connecting plate 27 away from the shielding plate 10 is opened with a threaded hole 46 communicating with the connecting hole 28 for the fastening bolt 45 to be screwed. The linkage rod 24 is provided with a first fixing hole 47 which is coaxial with the threaded hole 46 and into which the fastening bolt 45 is inserted when the abutting ring 29 abuts against the connecting plate 27. The push rod 38 is provided with a second fixing hole 48 which is coaxial with the first fixing hole 47 and is used for inserting the fastening bolt 45 when the positioning block 44 is abutted against the end of the linkage rod 24. When the linkage rod 24 and the push rod 38 complete the connection between the rectangular frame 2 and the shielding case 3, the abutting ring 29 on the linkage rod 24 abuts against the connecting plate 27, and the positioning block 44 on the push rod 38 abuts against one end of the linkage rod 24, so that the first fixing hole 47, the second fixing hole 48 and the threaded hole 46 are located at the same axial line position, and at this time, the fastening bolt 45 is screwed into the first fixing hole 47 and the second fixing hole 48, thereby fixing the push rod 38 and the linkage rod 24.

The implementation principle of the printed circuit board for inhibiting electromagnetic interference in the embodiment of the application is as follows:

after correspondingly inserting the fixing rod 7 on the rectangular frame 2 into the positioning hole 9 on the shielding cover body 3, inserting the linkage rod 24 into each through hole 26, so that the insertion rod 12 is inserted into the insertion hole 13 of the fixing rod 7, and the pre-positioning between the fixing rod 7 and the shielding cover body 3 is realized; then, the push rod 38 is inserted into the empty slot 40 of the linkage rod 24, so that the top block 33 in the push rod 38 plugging rod 12 abuts against the hole wall of the plugging hole 13, abutting force extending towards the axis direction of the fixing rod 7 is generated on the fixing rod 7, the rectangular frame 2 and the shielding cover body 3 can abut against and be fixed on the surface of the circuit board body 1, and finally the shielding cover body 3 is inserted into the clamping ring slot 4 of the rectangular frame 2 to form omnidirectional shielding of the electronic element 14, so that the shielding effect of the electronic element 14 is improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A printed circuit board for suppressing electromagnetic interference, comprising: the shielding device comprises a circuit board body (1) and a shielding device which is arranged on the circuit board body (1) and used for shielding an electronic element (14), wherein the shielding device comprises a rectangular frame (2) which is in plug fit with the circuit board body (1) and a shielding cover body (3) which is jointed with the rectangular frame (2) and is electrically connected with the rectangular frame; the rectangular frame (2) comprises a pair of parallel long frame strips (5) and a pair of parallel short frame strips (6), a plurality of fixing rods (7) perpendicular to the long frame strips (5) are arranged at equal intervals at the bottoms of the two long frame strips (5), and a preformed hole (8) for the fixing rod (7) to pass through is formed in the circuit board body (1);

the shielding device also comprises a shielding plate (10) which is arranged on the back side of the circuit board body (1) and is fixedly connected with the fixing rod (7); the shielding plate (10) is provided with positioning holes (9) for the fixing rods (7) to penetrate through, the middle of one side of the shielding plate (10) departing from the circuit board body (1) is uniformly provided with a plurality of protruding strips (11) which are parallel to the short frame strips (6) and extend towards the directions of the two adjacent positioning holes (9) at intervals, the number of the protruding strips (11) is the same as that of the fixing rods (7) on one long frame strip (5), two insertion rods (12) which move towards opposite or opposite directions along the length direction of the protruding strips (11) are symmetrically arranged in the protruding strips (11), the fixing rods (7) are provided with insertion holes (13) for the insertion rods (12) to be inserted, and the shielding plate (10) is provided with a driving mechanism for synchronously driving the insertion rods (12) in each protruding strip (11) to extend out of the protruding strip (11) to be inserted into the corresponding insertion holes (13) so that the shielding plate (10) and the rectangular frame (2) are tightly fixed on the circuit board body (1) together (ii) a The convex strip (11) is provided with a sliding groove (15) for the sliding connection of the two insertion connecting rods (12), and the sliding groove (15) penetrates through the two sides of the convex strip (11) along the length direction of the convex strip (11); a convex edge (16) is arranged on the outer wall of the insertion rod (12) in the circumferential direction, two ends of the convex strip (11) are provided with a limiting groove (17) which extends along the length direction of the convex strip (11) and allows the convex edge (16) to slide, a first limiting ring (18) which prevents the convex edge (16) from being separated from the limiting groove (17) is arranged at the notch of the limiting groove (17), the insertion rod (12) is sleeved with a first spring (21) which drives the convex edge (16) to abut against the bottom of the limiting groove (17) so that the insertion rod (12) can be completely retracted into the sliding groove (15), one end of the first spring (21) abuts against the first limiting ring (18), and the other end of the first spring abuts against the convex edge (16); the driving mechanism comprises linkage rods (24) in a cuboid structure, through holes (26) for the linkage rods (24) to pass through are formed in the middle of the convex strips (11) along the length direction perpendicular to the convex strips (11), a connecting plate (27) is vertically arranged in the middle of one side of the shielding plate (10), and connecting holes (28) for the linkage rods (24) to pass through are formed in the connecting plate (27); one end of the linkage rod (24) is provided with a spine part (25) for sliding off the two insertion rods (12) on the convex strip (11); when the convex edges (16) on the two insertion rods (12) in the convex strips (11) are abutted against the bottom of the limiting groove (17), a gap for the spine part (25) to slide off the two insertion rods (12) is formed between the two insertion rods (12); the outer side of one end, far away from the spine part (25), of the linkage rod (24) is provided with a butting ring (29) which is used for butting against the connecting plate (27) when the linkage rod (24) penetrates through all the raised strips (11) to push the plugging rod (12) to be plugged with the corresponding plugging hole (13); a locking assembly for fixing the linkage rod (24) when the abutting ring (29) abuts against the connecting plate (27) is arranged between the connecting plate (27) and the linkage rod (24); the plug rod (12) is of a cuboid structure, the edge of the outer side of the shielding plate (10), which is close to the positioning hole (9), is vertically connected with a baffle plate (30), and a blocking groove (31) for the plug rod (12) to be plugged when the butting ring (29) is butted with the connecting plate (27) is formed in the baffle plate (30); a groove (32) is formed in one side, far away from one end of the through hole (26), of the insertion rod (12) and close to the shielding plate (10), and a top block (33) which is opposite to the positioning hole (9) when the insertion rod (12) abuts against the bottom of the blocking groove (31) is connected in the groove (32) in a sliding mode; one end, far away from the baffle (30), of the insertion rod (12) is provided with a communicating hole (35) which extends to be communicated with the side wall of the groove (32) along the length direction of the insertion rod (12), a push rod (37) which is used for extending out of the groove (32) is connected in the communicating hole (35) in a sliding mode, and one end, close to the ejector block (33), of the push rod (37) is obliquely provided with a squeezing surface (36) which is used for pushing the ejector block (33) out of the groove (32); the driving mechanism also comprises a driving component for pushing the ejector rod (37) to move towards the direction of the ejector block (33) so as to enable the ejector block (33) to extend out of the groove (32) and tightly abut against the wall of the insertion hole (13); the driving assembly comprises a push block (39) and a push rod (38), and a hollow groove (40) which extends along the axial direction of the linkage rod (24) and is used for the sliding connection of the push rod (38) is coaxially formed in the middle of one end, far away from the spine part (25), of the linkage rod (24); a plurality of connecting rods (24) are arranged on the outer side of the linkage rod (24), when the abutting ring (29) abuts against the connecting plate (27), a mounting hole (41) which is positioned at the same axial position with the sliding groove (15), the mounting hole (41) is communicated with the empty groove (40), the push block (39) is connected in the mounting hole (41) in a sliding way, a convex ring (42) is arranged on the outer peripheral side of the push block (39), the outer side of the linkage rod (24) is provided with a ring groove (49) which is coaxial with the mounting hole (41) and is used for the sliding connection of the convex ring (42), a second limiting ring (19) for preventing the convex ring (42) from separating from the ring groove (49) is arranged at the notch of the ring groove (49), the outer peripheral side of the push block (39) is sleeved with a compression spring (23) which drives the push block (39) to be retracted into the annular groove (49), one end of the compression spring (23) is abutted against the second limiting ring (19), and the other end of the compression spring is abutted against the convex ring (42); when the convex rings (42) on the two push blocks (39) at the same axial position abut against the bottom of the groove (49), the adjacent ends of the two push blocks (39) abut against each other, a rounding surface is arranged on the adjacent side of the two push blocks (39), and a guide surface (43) which is inclined towards two sides and used for pushing the push blocks (39) to extend into the communicating holes (35) to drive the ejector rods (37) to push the ejector blocks (33) to extend out of the grooves (32) is arranged in the middle of one end of the push rod (38); the locking assembly includes a first fixed state for securing the linkage rod (24) and a second fixed state for securing the push rod (38).

2. A printed circuit board for suppressing electromagnetic interference according to claim 1, wherein: one end of the push rod (38) far away from the guide surface (43) is provided with a positioning block (44) which is used for abutting against the end part of the linkage rod (24) when the push rod (38) pushes all the push blocks (39) to extend into the communication hole (35); the locking assembly comprises a fastening bolt (45) screwed on the connecting plate (27), a first fixing hole (47) which is coaxial with the fastening bolt (45) and used for inserting the fastening bolt (45) when the abutting ring (29) abuts against the connecting plate (27) is formed in the linkage rod (24), and a second fixing hole (48) which is coaxial with the first fixing hole (47) and used for inserting the fastening bolt (45) when the positioning block (44) abuts against the end part of the linkage rod (24) is formed in the push rod (38).

3. A printed circuit board for suppressing electromagnetic interference according to claim 1, wherein: the protruding edgewise (34) that has sliding connection in recess (32) of one end periphery side of kicking block (33), the notch department of recess (32) is equipped with prevents edgewise (34) and breaks away from third spacing ring (20) of recess (32), the cover is equipped with on kicking block (33) and is used for promoting second spring (22) in kicking block (33) take in recess (32) completely, the one end butt in edgewise (34) of second spring (22), the other end butt in third spacing ring (20), the chamfer has been seted up at the border of edgewise (34).

4. A printed circuit board for suppressing electromagnetic interference according to claim 1, wherein: one side of the rectangular frame (2) far away from the fixing rod (7) is provided with a clamping ring groove (4) for interference clamping of the shielding cover body (3).