CN113939134B

CN113939134B - Fixing structure for printed board

Info

Publication number: CN113939134B
Application number: CN202111120077.9A
Authority: CN
Inventors: 陈宇
Original assignee: Beijing Institute of Radio Measurement
Current assignee: Beijing Institute of Radio Measurement
Priority date: 2021-09-24
Filing date: 2021-09-24
Publication date: 2023-06-20
Anticipated expiration: 2041-09-24
Also published as: CN113939134A

Abstract

The invention provides a fixing structure for a printed board, comprising: a base; and at least three groups of fixing components for combining and fixing the printed board and the base; the fixing component comprises a fixing piece which is used for penetrating through a through hole in the printed board and an adjusting piece which is connected with the fixing piece; the fixing piece comprises a rod part used for being connected with the adjusting piece and a limiting part formed at one end of the rod part; the adjusting piece is configured to move up and down relative to the rod part so that the printed board is fixed between the limiting part of the fixing piece and the adjusting piece; the base is combined and fixed with the fixing piece. The fixing structure can ensure reliable connection of connectors on the printed board and prevent the thickness error of the printed board from affecting the collision of the connectors.

Description

Fixing structure for printed board

Technical Field

The invention relates to the technical field of printed board assembly. And more particularly, to a fixing structure for a printed board.

Background

The upper surface of the printed board is provided with various connectors, and when the connectors need to collide, the height dimension of the printed board after being installed plays a critical role in the mutual collision of the connectors. If the height is too short, the connectors cannot be in close contact with each other, so that the transmission performance is affected; if the height is too high, the module colliding with the printed board is jacked up, so that a gap exists at the bottom of the module, and heat dissipation is seriously affected. There are three factors that determine whether the connector impact height meets the requirements: one is the thickness dimension of the printed board, one is the height dimension of the support post, and the other is the assembly error after the assembly of the two. The printed board has a machining error of plus or minus 10%, and the thickness tolerance of the printed board is plus or minus 0.2mm under the assumption that the thickness of the printed board is 2mm. The common clash connectors SMP-KK have a clash tolerance of only 0.3mm, and can be normally used when the clash depth is within an error range of 0.3mm, but the connector connection is unreliable when the clash depth exceeds the tolerance range. Within the range of collision tolerance, the error of the printed board occupies two thirds, the error left for the support column and assembly is only 0.1mm, and too small a margin can cause great difficulty in processing and assembling the structural member. Secondly, if the thickness of the printed board is changed, in order to ensure that the collision depth of the connector is unchanged, the height dimension of the support column on the structural member must be modified, and the production progress is seriously affected. There is an urgent need for a structure capable of neglecting the thickness dimension change of the printed board, that is, without affecting the connector clash regardless of the thickness of the printed board.

Disclosure of Invention

In view of the above problems, the present invention provides a fixing structure for a printed board, which can ensure reliable connection of connectors on the printed board and prevent thickness errors of the printed board from affecting connector clash.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

the invention provides a fixing structure for a printed board, comprising: a base; and

at least three groups of fixing components for combining and fixing the printed board and the base;

the fixing component comprises a fixing piece which is used for penetrating through a through hole in the printed board and an adjusting piece which is connected with the fixing piece;

the fixing piece comprises a rod part used for being connected with the adjusting piece and a limiting part formed at one end of the rod part;

the adjusting piece is configured to move up and down relative to the rod part so that the printed board is fixed between the limiting part of the fixing piece and the adjusting piece;

the base is combined and fixed with the fixing piece.

In addition, preferably, the fixing piece comprises a groove formed by inward recessing of the end surface of the rod part of the fixing piece, which is far away from the limiting part;

the base comprises at least three support posts arranged along the vertical direction; the top of the pillar is inserted and fixed in the groove.

In addition, preferably, the limiting part of the fixing piece comprises an opening communicated with the groove;

the support column comprises a threaded hole formed by inwards sinking the top end surface of the support column;

the open hole is correspondingly matched with the threaded hole; the limiting part is configured to penetrate through the hole through the screw and be screwed into the threaded hole so that the fixing piece and the base are combined and fixed.

Furthermore, preferably, the bottom surface of the groove is a first annular table surface, and the top surface of the pillar is a second annular table surface; the first annular table top is propped against the second annular table top.

In addition, preferably, the end face of the limiting part far away from the rod part comprises a slotted groove in a straight shape.

Furthermore, preferably, the fixing structure comprises four groups of fixing components; the base comprises four support posts which are correspondingly matched with the fixing component; the four struts are respectively positioned at four corners of the base.

In addition, preferably, the adjusting piece is an adjusting nut, the adjusting nut is in threaded connection with the rod part, and the top surfaces of the adjusting nuts included in the at least three groups of fixing components form a bearing surface for bearing the printed board.

The beneficial effects of the invention are as follows:

according to the invention, the printed boards are combined and fixed on the base through the fixing component, so that the printed boards are not limited by the thickness of the printed boards in the assembly process, the height consistency of the printed boards after the assembly is completed can be ensured no matter what thickness, the printed boards with different thicknesses can share the same fixing structure, the compatibility of the printed boards with different thicknesses is obviously improved, and the processing cost and the material cost are reduced. In addition, this fixed knot constructs the processing error that makes the printing board itself exist and can not influence the height of connector on the printing board, makes the printing board and this fixed knot construct the whole error after the assembly be in the error range that the connector clash allows to guarantee the reliable connection of connector, prevent that printing board thickness error from influencing the connector clash, moreover use this fixed knot construct need not consider printing board thickness error, can greatly reduced printing board in the assembly degree of difficulty with fixed knot construct when assembling, in addition, this fixed knot constructs overall structure is simple, need not complicated operation, maintenance cost is low.

Drawings

The following describes the embodiments of the present invention in further detail with reference to the drawings.

Fig. 1 is a schematic view of the assembly of the present invention.

Fig. 2 is a cross-sectional view of the present invention.

Fig. 3 is a cross-sectional view of a fastener of the present invention.

Fig. 4 is a top view of the mount of the present invention.

Fig. 5 is a cross-sectional view of a strut of the present invention.

Fig. 6a is an assembly diagram of the present invention and a printed board.

Fig. 6b is an assembly diagram in a conventional manner.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.

Techniques and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In order to solve the problem that tolerance of the printed boards produced in batch is randomly distributed, the connectors on the assembled printed boards cannot be reliably connected. The invention provides a fixing structure for a printed board, which is shown in fig. 1 to 5, 6a and 6b, and specifically comprises a through hole for installing and positioning the printed board; the fixing structure for the printed board comprises: a base 3; and at least three groups of fixing components for combining and fixing the printed board 4 and the base 3; the fixing assembly comprises a fixing piece 1 and an adjusting piece 2, wherein the fixing piece 1 is used for penetrating through a through hole in the printed board 4, and the adjusting piece 2 is connected with the fixing piece 1; the fixing piece 1 comprises a rod part 7 used for being connected with the adjusting piece 2 and a limit part 6 formed at one end of the rod part 7; the adjusting piece 2 is configured to be movable up and down relative to the rod portion 7 so that the printed board 4 is fixed between the limiting portion 6 of the fixing piece 1 and the adjusting piece 2; the base 3 is combined and fixed with the fixing piece 1.

According to the invention, the printed board 4 is combined and fixed on the base 3 through the fixing component, so that the printed board 4 is not limited by the thickness of the printed board in the assembly process, the height consistency of the printed board 4 after the assembly is completed can be ensured no matter what thickness, the printed boards 4 with different thicknesses can share the same fixing structure, the compatibility of the printed boards 4 with different thicknesses is obviously improved, and the processing cost and the material cost are reduced. In addition, this fixed knot constructs the processing error that makes printing board 4 itself exist and can not influence the height of connector on the printing board 4, makes the printing board 4 and this fixed knot construct after the assembly whole error be in the error range that the connector clash allows to guarantee the reliable connection of connector, prevent that printing board 4 thickness error from influencing the connector clash, moreover use this fixed knot construct need not consider printing board 4 thickness error, can greatly reduced printing board 4 the assembly degree of difficulty when with fixed knot construct assembly, in addition, this fixed knot constructs overall structure is simple, need not complicated operation, maintenance cost is low.

Regarding the assembly mode between the fixing element 1 and the base 3, in a specific embodiment, the fixing element 1 includes a groove 8 formed by recessing an end surface of the rod portion 7 of the fixing element 1 away from the limiting portion 6; the base 3 comprises at least three struts 12 arranged along the vertical direction; the top of the pillar 12 is inserted and fixed in the groove 8. Through the arrangement, the problem that the printed boards 4 can not be independently customized according to the matched support posts 12 of each printed board 4 to achieve proper height in batch production due to the fact that the printed boards 4 have tolerance and are randomly distributed is solved, and after the fixing structure provided by the invention is used, the support posts 12 can be matched with the printed boards 4 with different thicknesses only by being designed into the highly uniform size, so that the processing difficulty of the support posts 12 is reduced. In the batch production process, the collision precision of the connector on the printed board 4 can be ensured, and the situation that poor contact or poor heat dissipation of the connector occurs due to the thickness tolerance of the printed board 4 is prevented.

Further, in this embodiment, the limiting portion 6 of the fixing member 1 includes an opening 9 that communicates with the groove 8; the support column 12 comprises a threaded hole 13 formed by inward recessing of the top end surface of the support column 12; the open hole 9 is correspondingly matched with the threaded hole 13; the limiting part 6 is configured to penetrate through the hole 9 through the screw 5 and be screwed into the threaded hole 13 so as to enable the fixing piece 1 to be combined and fixed with the base 3. The hole 9 is used for assembling the screw 5, the screw 5 penetrates through the hole 9 and is combined and fixed with the support column 12 through the threaded hole 13, the printed board 4 is fixed on the base 3 through the screw 5, and the printed board 4 is further fixed to prevent the printed board 4 from moving. Specifically, the bottom surface of the groove 8 is a first annular table surface 10, and the top surface of the pillar 12 is a second annular table surface; the first annular table top 10 abuts against the second annular table top.

In an alternative embodiment, the end surface of the limiting part 6 far away from the rod part 7 comprises a slot 11 in a shape of a straight line. This has the advantage that the fastening element 1 can be screwed easily through the in-line slot 11. Specifically, the groove 8 of the fixing member 1 is formed with a thread, the outer circumferential surface of the pillar 12 is formed with a thread, the fixing member 1 is screwed and fixed with the pillar 12, and the fixing member 1 and the pillar 12 can be screwed by a tool such as a screwdriver through the slot 11.

In order to stabilize the fixed printed board 4, in a specific embodiment, the fixing structure includes four groups of fixing components; the base 3 comprises four supporting columns 12 which are correspondingly matched with the fixing components; four posts 12 are located at the four corners of the base 3, respectively. It can be understood that through holes for installing and positioning the printed board 4 are formed at four corners of the printed board 4, and the printed board 4 can be stably fixed on the base 3 through the cooperation of four groups of fixing components and four supporting columns 12.

In a specific embodiment, the adjusting member 2 is an adjusting nut, the adjusting nut is screwed with the rod portion 7, and the top surfaces of the adjusting nuts included in the at least three fixing assemblies form a bearing surface for bearing the printed board 4. The position of the adjusting nut is adjusted by screwing the adjusting nut, the printed board 4 with different thickness sizes is matched, the printed board 4 is fixed on a fixed structure, and the upper surface of the printed board 4 can be located at a height required for guaranteeing reliable connection of the connector by being matched with the base 3.

In a specific implementation process, the rod part 7 of the fixing piece 1 is embedded into the hole 9 of the printed board 4, the limit part 6 of the fixing piece 1 is abutted against the upper surface of the printed board 4, the adjusting nut is screwed in from one end of the rod part 7, and the adjusting nut is abutted against the lower surface of the printed board 4 after being screwed in; then other fixing components are arranged on the printed board 4 according to the steps, and the four groups of fixing components and the printed board 4 form a whole; the printed board 4 with the fixing component is assembled on the base 3 from top to bottom, and after the first annular table top 10 of the adjusting fixing piece 1 is contacted with the top surface of the support column 12 of the base 3, the printed board 4 is limited to move downwards continuously, and the printed board 4 is supported at a certain height; finally, the printed board 4 is locked on the base 3 by using the screws 5 to pass through the holes 9 at the top of the fixing piece 1, so as to finish final assembly.

The fastening structure is shown in fig. 6a, 6b in a conventional assembly. Fig. 6a is an assembly view of the present invention and a printed board, and fig. 6b is an assembly view of the present invention in a conventional manner. As can be seen by comparison, the mounting reference surface of the fixing structure is the upper surface of the printed board, when the thickness of the printed board is changed, the distance between the upper surface of the printed board and the bottom surface is unchanged, the distance between the lower surface of the printed board and the bottom surface is changed, when the fixing structure is assembled in a conventional manner, the mounting reference surface is the lower surface of the printed board, when the thickness of the printed board is changed, the distance between the lower surface of the printed board and the bottom surface is unchanged, and the distance between the upper surface of the printed board and the bottom surface is changed. The fixing structure provided by the invention can effectively avoid the floating of the height dimension of the printed board after assembly, ensure the collision dimension of the connector on the printed board, solve the problem that the dimension of the height direction cannot be ensured after assembly due to the existence of tolerance of the thickness dimension of the printed board during the installation of the printed board, ensure that the height dimension is not limited by the thickness of the printed board after the assembly of the printed board, and ensure that the height dimension of the printed board after the assembly is unchanged no matter whether the tolerance exists in the printed board or the thickness of the printed board is modified due to the design optimization during the production process.

In addition, it should be noted that, the thickness deviation of the printed board will generally float within plus or minus 10%, especially in the batch production process, the thickness of the printed board is randomly distributed, so that the height of the printed board after the printed board is assembled with the existing equipment is also randomly distributed, a certain value cannot be ensured, and the connector above the printed board is unreliable in collision. If the support post of the existing equipment, which is positioned below the printed board, is adjusted to match with the adjustment of the assembly height, huge workload is brought. Specifically, on one hand, each printed board needs to be matched with a base with a specific height; on the other hand, each printed board cannot be replaced with the base, and the printed boards must be in one-to-one correspondence. After the fixing structure provided by the invention is used, the original mode of taking the lower surface of the printed board as a mounting reference surface can be converted into the mode of taking the first annular table surface as the reference surface, namely, a variable with uncontrollable height dimension is converted into a fixed and controllable ration, and further, a larger range with a tolerance of plus or minus 10% is converted into a negligible minimum error with the tolerance controlled within a range of plus or minus 0.02mm, namely, the tolerance of plus or minus 10% is controlled to be plus or minus 0.2mm when the thickness of the printed board is assumed to be 2mm, and the tolerance of a fixing piece is controlled to be plus or minus 0.02mm. Compared with the prior equipment, the precision after the printed board is assembled is improved by 10 times.

It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.

Claims

1. A fixing structure for a printed board, comprising:

a base; and

the base is combined and fixed with the fixing piece;

the adjusting piece is an adjusting nut which is in threaded connection with the rod part, and the top surfaces of the adjusting nuts included in the at least three groups of fixing components form a bearing surface for bearing the printed board;

the fixing piece comprises a groove formed by inwards sinking the end face, far away from the limiting part, of the fixing piece rod part;

the base comprises at least three support posts arranged along the vertical direction; the top of the support post is inserted and fixed in the groove;

the limiting part of the fixing piece comprises an opening communicated with the groove;

2. The fixing structure for a printed board according to claim 1, wherein a bottom surface of the groove is a first annular mesa, and a top surface of the pillar is a second annular mesa; the first annular table top is propped against the second annular table top.

3. The fixing structure for the printed board as claimed in claim 1, wherein the end surface of the limiting portion far from the lever portion includes a slot in a shape of a straight line.

4. The fixing structure for a printed board according to claim 1, wherein the fixing structure comprises four groups of fixing components; the base comprises four support posts which are correspondingly matched with the fixing component; the four struts are respectively positioned at four corners of the base.