Elastic pressing welding positioning jig

Abstract

The utility model relates to an elastic material pressing welding positioning jig which comprises a positioning base, a bottom plate carrier and an elastic material pressing cover plate, the elastic material pressing cover plate comprises a cover plate body, a plurality of pressing blocks and four pressing preventing strips, and the four pressing preventing strips are arranged on the lower portions of the four edges of the cover plate body. The pressing block comprises a fixing plate fixed to the upper surface of the cover plate body and a plurality of flat-bottom spring PINs embedded in the fixing plate, through holes allowing the flat-bottom spring PINs to vertically penetrate through are formed in the cover plate body, and the height of the bottom faces of the flat-bottom spring PINs is between the height of the bottom face of the cover plate body and the height of the bottom faces of the pressing prevention strips. And the flat-bottom spring PIN is in surface contact with the contact surface of the pasting piece, so that the pressure can be dispersed, and the pasting piece is ensured to be pressed tightly and stably. The anti-pressing strip shares the clamping force generated by the clamp, the pressure of the flat-bottom spring PIN on the pasting piece is restrained, and the pasting piece is prevented from being damaged by pressing. When the jig is used, the pressing block and the cover plate body are connected into a whole. And during model changing, the pressing block can be detached from the cover plate body for replacement, so that the layout of the flat-bottom spring PIN can be changed.

Description

Technical Field

[0001] The utility model relates to the technical field of clamping and positioning, in particular to an elastic pressing material welding positioning jig. Background Art

[0002] With the continuous advancement of technology, electronic products have gradually occupied the entire lifestyle. Small and exquisite appearance has become an inevitable trend of development. In order to make the products more accurate and exquisite, the precision requirements of assembly are essential. The precision of electronic mounting directly affects the assembly requirements of customers.

[0003] The primary purpose of spring PIN carriers is to ensure stable and precise positioning and contact of electronic components during soldering or assembly. Conventional spring PIN soldering ends are typically cylindrical, limiting the contact area with FPC components and making them prone to problems such as false soldering and false welding.

[0004] Chinese patent CN112872678A discloses a welding and pressing fixture for assembling 5G mobile phone antenna FPCs. The fixture includes several pins evenly distributed on the bottom of the fixture's gland. Each pin is equipped with a spring. However, the pins are not specifically designed for this purpose. When clamped together, some pins fail to hold down the product, while others provide a strong spring force that can easily damage the component.

[0005] Therefore, it is necessary to improve the fixture structure to solve the above problems. Utility Model Content

[0006] The main purpose of the utility model is to provide an elastic pressing material welding positioning fixture, which can disperse the pressure, ensure that the patch is pressed tightly and stably, and avoid crushing the patch.

[0007] The utility model achieves the above-mentioned purpose through the following technical solutions: an elastic pressing material welding positioning fixture, used to press a plurality of patches to the preset positions on the FPC to complete the welding, comprising:

[0008] The positioning base has an L-shaped protrusion at each corner of its upper surface, and the inner side of the L-shaped protrusion forms a rectangular area that matches the range of the bottom plate carrier and the elastic pressure cover plate;

[0009] A bottom plate carrier is located between the positioning base and the elastic pressing cover plate;

[0010] An elastic pressing cover plate includes a cover plate body, a plurality of pressing blocks and four anti-pressure strips. The four anti-pressure strips are arranged at the lower parts of the four sides of the cover plate body. The pressing blocks include a fixing plate fixed to the upper surface of the cover plate body and a plurality of flat-bottom spring PINs embedded in the fixing plate. The cover plate body is provided with a through hole for the flat-bottom spring PIN to vertically pass through. The bottom surface height of the flat-bottom spring PIN is between the bottom surface of the cover plate body and the bottom surface of the anti-pressure strip.

[0011] Specifically, at least two lower coarse positioning columns are provided on the positioning base, and the two lower coarse positioning columns occupy a set of diagonal positions in the rectangular area. The lower coarse positioning columns pass through the bottom plate carrier and the elastic pressing cover plate, and the bottom plate carrier has multiple first positioning holes matching the lower coarse positioning columns.

[0012] Furthermore, a plurality of lower precision positioning columns are provided on the positioning base, and the array of lower precision positioning columns is arranged in the middle of the rectangular area. The lower precision positioning columns pass through the base plate carrier, and the diameter of the lower precision positioning columns is smaller than the diameter of the lower coarse positioning columns. The base plate carrier has a plurality of second positioning holes matching the lower precision positioning columns.

[0013] Specifically, a group of opposite sides of the positioning base are provided with large notches extending into the rectangular area.

[0014] Specifically, a plurality of upper positioning columns are provided at the lower part of the cover body, and the upper positioning columns pass downward through the base carrier. The base carrier has a plurality of third positioning holes matching the upper positioning columns, and the positioning base is provided with avoidance holes matching the upper positioning columns.

[0015] Specifically, a group of opposite sides of the bottom plate carrier are provided with small notches extending to the bottom of the elastic pressing cover plate.

[0016] Specifically, the cover body is provided with a plurality of heat dissipation holes.

[0017] The beneficial effects of the technical solution of this utility model are:

[0018] 1. The flat-bottom spring PIN and the contact surface of the patch are in surface contact, which can disperse the pressure and ensure that the patch is pressed tightly and stably;

[0019] 2. The fixture distributes the clamping force generated by the clamp through the anti-pressure strip, thereby suppressing the pressure of the flat-bottom spring PIN pressing on the patch to avoid damaging the patch;

[0020] 3. When the fixture is in use, the pressing block is connected to the cover body as a whole; when changing the model, the pressing block can be removed from the cover body and replaced, so that the layout of the flat bottom spring PIN can be changed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Exploded view of the elastic pressing welding positioning jig and the product;

[0022] Figure 2 A three-dimensional diagram of the positioning base;

[0023] Figure 3 A perspective view of the base carrier;

[0024] Figure 4 It is a three-dimensional diagram of the elastic pressing cover;

[0025] Figure 5 A three-dimensional diagram of the briquette.

[0026] The numbers in the figure represent:

[0027] 1-Elastic pressing material welding positioning fixture;

[0028] 11- positioning base, 111- L-shaped protrusion, 112- lower coarse positioning column, 113- lower fine positioning column, 114- large notch, 115- avoidance hole;

[0029] 12-base carrier, 121-first positioning hole, 122-second positioning hole, 123-third positioning hole, 124-avoidance groove, 125-small notch;

[0030] 13-elastic pressing cover, 131-cover body, 1311-heat dissipation hole, 132-pressing block, 1321-fixing plate, 1322-flat bottom spring PIN, 133-anti-pressure strip, 134-upper positioning column;

[0031] 21-patch, 22-FPC. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below with reference to specific embodiments.

[0033] Example:

[0034] like Figure 1 As shown, an elastic pressing material welding positioning fixture 1 of the present invention is used to press several patches 21 to preset positions on FPC 22 to complete welding, including a positioning base 11, a bottom plate carrier 12 and an elastic pressing material cover 13, and the bottom plate carrier 12 is located between the positioning base 11 and the elastic pressing material cover 13.

[0035] During operation, the positioning base 11, base carrier 12, FPC 22, component 21, and elastic pressure cover 13 are arranged in an overlapping manner. The elastic pressure cover 13 presses the component 21 against the upper surface of the FPC 22, preventing it from sliding freely between the components 21 and the FPC 22. The entire assembly is then placed in a reflow soldering machine and heated, melting the material at the contact point between the component 21 and the FPC 22, thus forming a conductive connection.

[0036] like Figure 2 As shown, the four corners of the upper surface of the positioning base 11 are each provided with an L-shaped protrusion 111. The inner side surfaces of the L-shaped protrusions 111 enclose a rectangular area that matches the range of the base carrier 12 and the elastic pressure cover plate 13. The positioning base 11 is equipped with at least two lower coarse positioning posts 112 and a plurality of lower fine positioning posts 113. The two lower coarse positioning posts 112 occupy a set of diagonal positions in the rectangular area, and the lower coarse positioning posts 112 pass through the base carrier 12 and the elastic pressure cover plate 13. The lower fine positioning posts 113 are arranged in an array in the middle of the rectangular area and pass through the base carrier 12. A large notch 114 is provided on a set of opposite sides of the positioning base 11, extending into the range of the rectangular area.

[0037] The planar outlines of the base carrier 12 and the elastic pressure cover 13 are both rectangular and the two rectangles are of equal size (slightly smaller than the above-mentioned rectangular area), so the positioning base 11 uses the L-shaped protrusion 111 to limit the range of the base carrier 12 and the elastic pressure cover 13. The position of the lower coarse positioning column 112 is actually outside the vertical projection range of the FPC 22. The lower coarse positioning column 112 only plays a coarse positioning role for the base carrier 12 and the elastic pressure cover 13 as a whole. There can be two, three, four, etc. The diameter of the lower fine positioning column 113 is generally smaller than the diameter of the lower coarse positioning column 112. The purpose of setting the lower fine positioning column 113 is to help position the base carrier 12 and the FPC 22 accurately at each welding position, so that the problem of inaccurate attachment of the patch 21 due to the flexibility of the FPC 22 will not be caused. The large notch 114 is used to facilitate the separation of the base carrier 12 and the elastic pressure cover 13 from the positioning base 11 after welding is completed.

[0038] like Figure 4 and Figure 5As shown, the elastic pressure cover 13 includes a cover body 131, several pressure blocks 132, four anti-pressure strips 133, and several upper positioning posts 134. The anti-pressure strips 133 are located at the lower portions of the four sides of the cover body 131. The pressure blocks 132 include a fixing plate 1321 fixed to the upper surface of the cover body 131 and multiple flat-bottom spring pins 1322 embedded in the fixing plate 1321. The cover body 131 is provided with through holes for vertically passing the flat-bottom spring pins 1322, as well as several heat dissipation holes 1311. The bottom surface of the flat-bottom spring pins 1322 is located at a height between the bottom surface of the cover body 131 and the bottom surface of the anti-pressure strips 133. The upper positioning posts 134 are located at the lower portion of the cover body 131 and extend downward through the base plate carrier 12. The positioning base 11 is provided with avoidance holes 115 that match the upper positioning posts 134.

[0039] The cover body 131 is made of high-strength materials, such as high-temperature-resistant synthetic stone or aluminum, to ensure it remains stable during use. The through-holes can be arranged to correspond to individual products or to cover an entire row of products. When the jig is in use, the fixing plate 1321 is integrally connected to the cover body 131. To change models, the pressure block 132 can be removed and replaced from the cover body 131, allowing the layout of the flat-bottom spring pins 1322 to be changed. The elastic pressing cover 13 is clamped to the positioning base 11 by a clamp, and the pressure block 132 transmits pressure to the top surface of the patch 21 via the flat-bottom spring pins 1322. The bottom surface of the flat-bottom spring pins 1322 is shaped to match the top structure of the patch 21 (either a single-plane structure or a stepped structure). This ensures surface contact between the flat-bottom spring pins 1322 and the patch 21, distributing pressure and ensuring that the patch 21 is firmly pressed and stabilized. The anti-pressure strip 133 is made of a flexible material and is used to share the clamping force generated by the clip, thereby suppressing the pressure of the flat-bottom spring PIN 1322 on the patch 21 to avoid damaging the patch 21. During the clamping process of the fixture, as the anti-pressure strip 133 becomes thinner, the upper positioning column 134 will further pass through the base carrier 12. In order to prevent the upper surface of the positioning base 11 from pressing against the upper positioning column 134, it is necessary to set a avoidance hole 115 for avoidance. The heat dissipation hole 1311 is used to help the product dissipate heat during welding to prevent overheating and damage to the FPC 22. If the fixing plate 1321 blocks the position of the heat dissipation hole 1311, corresponding auxiliary heat dissipation holes can also be set.

[0040] like Figure 3 As shown, the base carrier 12 has a plurality of first positioning holes 121 that match the lower coarse positioning posts 112, a plurality of second positioning holes 122 that match the lower fine positioning posts 113, and a plurality of third positioning holes 123 that match the upper positioning posts 134. The top surface of the base carrier 12 is also provided with a plurality of avoidance grooves 124 that match the positions of the stickers 21. A set of opposing sides of the base carrier 12 are provided with small notches 125 that extend below the elastic press cover 13.

[0041] The above-mentioned positioning holes ensure precise positioning between the base carrier 12, the positioning base 11, and the elastic pressure cover 13. The backside of the FPC 22 and the mounting position of the patch 21 are roughly positioned using the avoidance groove 124. The small notch 125 facilitates the separation of the base carrier 12 from the cover body 131.

[0042] The above descriptions are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. An elastic pressing material welding positioning fixture, used to press several patches to the preset positions on the FPC to complete the welding, characterized by include: The positioning base has an L-shaped protrusion at each corner of its upper surface, and the inner side of the L-shaped protrusion forms a rectangular area that matches the range of the bottom plate carrier and the elastic pressure cover plate; A bottom plate carrier is located between the positioning base and the elastic pressing cover plate; An elastic pressing cover plate includes a cover plate body, a plurality of pressing blocks and four anti-pressure strips. The four anti-pressure strips are arranged at the lower parts of the four sides of the cover plate body. The pressing blocks include a fixing plate fixed to the upper surface of the cover plate body and a plurality of flat-bottom spring PINs embedded in the fixing plate. The cover plate body is provided with a through hole for the flat-bottom spring PIN to vertically pass through. The bottom surface height of the flat-bottom spring PIN is between the bottom surface of the cover plate body and the bottom surface of the anti-pressure strip.

2. The elastic pressing material welding positioning jig according to claim 1, characterized in that: At least two lower coarse positioning columns are provided on the positioning base, and the two lower coarse positioning columns occupy a set of diagonal positions in the rectangular area. The lower coarse positioning columns pass through the bottom plate carrier and the elastic pressing cover plate, and the bottom plate carrier has multiple first positioning holes matching the lower coarse positioning columns.

3. The elastic pressing material welding positioning jig according to claim 2, characterized in that: The positioning base is also provided with a plurality of lower precision positioning columns, and the array of the lower precision positioning columns is arranged in the middle of the rectangular area. The lower precision positioning columns pass through the base plate carrier. The diameter of the lower precision positioning columns is smaller than the diameter of the lower coarse positioning columns, and the base plate carrier has a plurality of second positioning holes matching the lower precision positioning columns.

4. The elastic pressing material welding positioning jig according to claim 1, characterized in that: A set of opposite sides of the positioning base are provided with large notches extending into the rectangular area.

5. The elastic pressing material welding positioning jig according to claim 1, characterized in that: The lower part of the cover body is provided with a plurality of upper positioning columns, and the upper positioning columns pass downward through the base carrier. The base carrier has a plurality of third positioning holes matching the upper positioning columns, and the positioning base is provided with avoidance holes matching the upper positioning columns.

6. The elastic pressing material welding positioning jig according to claim 1, characterized in that: A group of opposite sides of the bottom plate carrier are provided with small notches extending to the bottom of the elastic material pressing cover plate.

7. The elastic pressing material welding positioning jig according to claim 1, characterized in that: The cover plate body is provided with a plurality of heat dissipation holes.

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