Pseudo soldering prevention device for wiring harness and circuit board tin soldering process

Abstract

The utility model discloses a pseudo soldering prevention device for a wiring harness and circuit board tin soldering process, which comprises a first welding auxiliary sheet and a second welding auxiliary sheet, and the first welding auxiliary sheet and the second welding auxiliary sheet are symmetrically attached to the back of a circuit board to be welded. A plurality of wire core bayonets are formed in the contour edges of the sides, close to each other, of the first welding auxiliary piece and the second welding auxiliary piece, and the wire core bayonets are aligned with a plurality of threading holes in a circuit board to be welded; and the problem of pseudo soldering can be effectively avoided and identified.

Description

Technical Field

[0001] The utility model belongs to the field of circuit board welding. Background Art

[0002] The general process of wire harness threading welding on the circuit board is as follows:

[0003] First, the exposed wire core section of the end of the wire harness is passed through the threading hole on the back of the circuit board to be welded to the front of the circuit board to be welded, and then the exposed wire core section of the end of the wire harness that has passed through the front of the circuit board to be welded is welded to the metal pad on the front of the welding circuit board through a soldering device; in order to avoid the situation of cold welding, the best situation is that during the welding process, the soldering liquid penetrates into the threading hole, and finally penetrates from the front of the welding circuit board through the threading hole to the back of the circuit board to be welded, so that the exposed wire core section is fully infiltrated by the soldering liquid;

[0004] In practice, Figure 5 As shown, the end surface 6.1 of the sheath section 6 of the wiring harness easily blocks the threading hole 13 on the back side of the circuit board 12 to be welded, causing the soldering liquid that penetrates into the threading hole 13 from the front side of the circuit board 12 to be welded to be unable to penetrate out from the back side of the circuit board 12 to be welded, and ultimately unable to observe whether the soldering liquid penetrates into the threading hole 13, thereby posing a risk of cold soldering. Summary of the invention

[0005] Purpose of the invention: In order to overcome the deficiencies in the prior art, the utility model provides a device for preventing cold solder joints in the soldering process of wire harnesses and circuit boards, which can effectively avoid and identify the problem of cold solder joints.

[0006] Technical solution: To achieve the above-mentioned purpose, the utility model provides a device for preventing false solder joints in the soldering process of a wiring harness and a circuit board, comprising a first welding auxiliary sheet and a second welding auxiliary sheet. When the first welding auxiliary sheet and the second welding auxiliary sheet are symmetrically attached to the back of the circuit board to be soldered, a plurality of wire core bayonet holes are arranged on the contour edges of one side of the first welding auxiliary sheet and the second welding auxiliary sheet close to each other, and the plurality of wire core bayonet holes are respectively aligned with a plurality of threading holes on the circuit board to be soldered;

[0007] The wire harness to be welded comprises a sheath section and an end wire core exposed section; the wire core bayonet allows the end wire core exposed section to pass through, while the sheath section cannot pass through the wire core bayonet.

[0008] Furthermore, the width of the wire core bayonet is between the outer diameter of the wire core exposed section and the outer diameter of the sheath section; and the aperture of each threading hole is larger than the outer diameter of the end wire core exposed section.

[0009] Furthermore, a first pair of wing plates and a second pair of wing plates are vertically arranged on the sides of the first welding auxiliary plate and the second welding auxiliary plate that are away from each other, respectively.

[0010] Furthermore, it comprises an elastic clip unit, the clamping part of which is clamped on the side where the first pair of wing plates and the second pair of wing plates are far away from each other, so that the first welding auxiliary plate and the second welding auxiliary plate tend to approach each other.

[0011] Furthermore, a first pair of limiting snap-in openings and a second pair of limiting snap-in openings are respectively provided on the contour edges of one side where the first welding auxiliary piece and the second welding auxiliary piece are close to each other.

[0012] Furthermore, the circuit board to be welded is locked on the mounting plate with a window by means of a number of cooperating studs and nuts; when the first welding auxiliary plate and the second welding auxiliary plate are symmetrically attached to the back of the circuit board to be welded, a nut is inserted into the first pair of limiting snap-fits and the second pair of limiting snap-fits.

[0013] Furthermore, on the front side of the circuit board to be welded, each threading hole is surrounded by a metal pad.

[0014] Beneficial effect: the exposed wire core section at the end of the wiring harness of the utility model eventually passes through the threading hole to the front side of the circuit board to be welded; since the width of the wire core bayonet is smaller than the outer diameter of the sheath section, during the process of the exposed wire core section at the end passing through the threading hole to the front side of the circuit board to be welded, the end surface of the sheath section is eventually blocked by the surface of the first welding auxiliary sheet or the second welding auxiliary sheet and cannot contact the back side of the circuit board to be welded, thereby avoiding the end surface of the sheath section completely blocking several threading holes on the back side of the circuit board to be welded, avoiding the problem that the soldering liquid that penetrates into the threading holes from the front side of the circuit board to be welded cannot penetrate out from the back side of the circuit board to be welded, and finally unable to observe whether the soldering liquid penetrates into the threading holes, thereby finally avoiding the problem of cold solder joints. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 The disassembly diagram of this scheme from two perspectives, the upper part of this diagram is the front view of the circuit board to be welded, and the lower part is the back view of the circuit board to be welded;

[0016] Attached Figure 2 is a schematic diagram of the device during installation, and is a three-dimensional schematic diagram of the first welding auxiliary sheet and the second welding auxiliary sheet before being clamped by the elastic clip unit;

[0017] Attached Figure 3 For attachment Figure 2 A partial schematic diagram at the mark 16 of FIG.

[0018] Attached Figure 4 This is a schematic diagram of the device in working state, the upper part of this figure is the front view of the circuit board to be welded, and the lower part is the back view of the circuit board to be welded;

[0019] Attached Figure 5 This is a schematic diagram of the wiring harness structure to be welded. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings.

[0021] As attached Figures 1 to 5 The anti-false solder joint device for the soldering process of the wiring harness and the circuit board shown in the figure is as follows: Figure 1 As shown, the circuit board 12 to be welded is locked on the mounting plate 9 with the window 11 by a plurality of studs 10 and nuts 15 that cooperate with each other. The mounting plate 9 here can be a fixed structure such as the back plate of an electrical device; Figure 1 In the upper part of the figure, on the front side of the circuit board 12 to be welded, each threading hole 13 is surrounded by a metal pad 13.1 for welding the wiring harness; the specific structure of this scheme is as follows:

[0022] The present solution provides a first welding auxiliary sheet 3.1 and a second welding auxiliary sheet 3.2, both of which are metal structures with a melting point higher than that of tin soldering; when in use, the first welding auxiliary sheet 3.1 and the second welding auxiliary sheet 3.2 are symmetrically attached to the back of the circuit board 12 to be welded, and a plurality of wire core snap-ons 4 are arranged on the contour edge of one side where the first welding auxiliary sheet 3.1 and the second welding auxiliary sheet 3.2 are close to each other, and the plurality of wire core snap-ons 4 are respectively aligned with a plurality of threading holes 13 on the circuit board 12 to be welded; the wire harness to be welded includes a sheath section 6 and an end wire core exposed section 7; the width of the wire core snap-on 4 is between the outer diameter of the wire core exposed section 7 and the outer diameter of the sheath section 6, so that the wire core snap-on 4 allows the end wire core exposed section 7 to pass through, and the sheath section 6 cannot pass through the wire core snap-on 4; the aperture of each threading hole 13 is larger than the outer diameter of the end wire core exposed section 7 for solder liquid penetration.

[0023] A first pair of wing plates 5.1 and a second pair of wing plates 5.2 are vertically arranged on the side where the first welding auxiliary plate 3.1 and the second welding auxiliary plate 3.2 are away from each other, respectively; it includes an elastic clip unit 1, and the elastic clip unit 1 is an elastic metal clip structure. The clamping part 2 of the elastic clip unit 1 is clamped on the side where the first pair of wing plates 5.1 and the second pair of wing plates 5.2 are away from each other, so that the first welding auxiliary plate 3.1 and the second welding auxiliary plate 3.2 tend to approach each other.

[0024] A first pair of limiting snap-ons 8.1 and a second pair of limiting snap-ons are respectively provided on the contour edges of one side where the first welding auxiliary plate 3.1 and the second welding auxiliary plate 3.2 are close to each other; when the first welding auxiliary plate 3.1 and the second welding auxiliary plate 3.2 are symmetrically attached to the back side of the circuit board 12 to be welded, a nut 15 is inserted into the first pair of limiting snap-ons 8.1 and the second pair of limiting snap-ons, thereby realizing the positioning of the first welding auxiliary plate 3.1 and the second welding auxiliary plate 3.2.

[0025] Working principle:

[0026] Preparation process before welding:

[0027] The first welding auxiliary sheet 3.1 and the second welding auxiliary sheet 3.2 are symmetrically attached to the back of the circuit board 12 to be welded, and the nuts 15 are inserted into the first pair of limit snap-in openings 8.1 and the second pair of limit snap-in openings on the first welding auxiliary sheet 3.1 and the second welding auxiliary sheet 3.2; Figure 2 As shown, the clamping part 2 of the elastic clip unit 1 is then clamped on the side where the first pair of wing plates 5.1 and the second pair of wing plates 5.2 are away from each other, thereby realizing the positioning of the first welding auxiliary plate 3.1 and the second welding auxiliary plate 3.2. At this time, the plurality of wire core bayonet holes 4 are respectively aligned with the plurality of threading holes 13 on the back of the circuit board 12 to be welded;

[0028] Welding process:

[0029] The exposed wire core sections 7 of the end portions of the plurality of wire harnesses are respectively inserted from the wire core bayonet 4 into the plurality of threading holes 13 on the back side of the circuit board 12 to be welded, and the exposed wire core sections 7 of the end portions are finally passed out from the plurality of threading holes 13 to the front side of the circuit board 12 to be welded; since the width of the wire core bayonet 4 is smaller than the outer diameter of the sheath section 6, in the process of the exposed wire core sections 7 of the end portions passing out from the threading holes 13 to the front side of the circuit board 12 to be welded, the end surface 6.1 of the sheath section 6 is finally blocked by the surface of the first welding auxiliary sheet 3.1 or the second welding auxiliary sheet 3.2 and cannot contact the back side of the circuit board 12 to be welded, thereby preventing the end surface 6.1 of the sheath section 6 from completely blocking the plurality of threading holes 13 on the back side of the circuit board 12 to be welded, resulting in the soldering liquid that penetrates into the threading holes 13 from the front side of the circuit board 12 to be welded being unable to penetrate out from the back side of the circuit board 12 to be welded, and it is impossible to finally observe whether the soldering liquid has penetrated into the threading holes 13, thereby posing a risk of cold welding;

[0030] Finally, molten solder liquid is applied to each metal pad 13.1 on the front side of the circuit board 12 to be welded by means of a soldering device, thereby welding the metal pad 13.1 to the exposed end wire core section 7 that passes through the threading hole 13 to the front side of the circuit board 12 to be welded; at the same time, the solder liquid on the metal pad 13.1 on the front side of the circuit board 12 to be welded penetrates through the threading hole 13 to the back side of the circuit board 12 to be welded, thereby finally forming solder that seeps out from the threading hole 13 to the back side in the wire core clamping socket 4 on each first welding auxiliary sheet 3.1 and the second welding auxiliary sheet 3.2; based on this, a good evaluation of the welding quality can be obtained, avoiding the problem of cold soldering.

[0031] After welding is completed, first remove the clamp unit 1, and then remove the first welding auxiliary sheet 3.1 and the second welding auxiliary sheet 3.2.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A device for preventing cold soldering in the soldering process of wiring harness and circuit board, characterized in that: The device comprises a first welding auxiliary sheet (3.1) and a second welding auxiliary sheet (3.2); when the first welding auxiliary sheet (3.1) and the second welding auxiliary sheet (3.2) are symmetrically attached to the back of a circuit board (12) to be welded, a plurality of wire core snap-in slots (4) are arranged on the contour edges of one side of the first welding auxiliary sheet (3.1) and the second welding auxiliary sheet (3.2) close to each other; and the plurality of wire core snap-in slots (4) are respectively aligned with a plurality of threading holes (13) on the circuit board (12) to be welded; The wire harness to be welded comprises a sheath section (6) and an end wire core exposed section (7); the wire core bayonet (4) allows the end wire core exposed section (7) to pass through, while the sheath section (6) cannot pass through the wire core bayonet (4).

2. The device for preventing cold solder joints in the soldering process of the wiring harness and the circuit board according to claim 1, characterized in that: The width of the wire core bayonet (4) is between the outer diameter of the wire core exposed section (7) and the outer diameter of the sheath section (6); the diameter of each threading hole (13) is larger than the outer diameter of the end wire core exposed section (7).

3. The device for preventing cold solder joints in the soldering process of the wiring harness and the circuit board according to claim 2, characterized in that: A first pair of wing plates (5.1) and a second pair of wing plates (5.2) are respectively vertically arranged on one side of the first welding auxiliary plate (3.1) and the second welding auxiliary plate (3.2) that are away from each other.

4. The device for preventing cold solder joints in the soldering process of the wiring harness and the circuit board according to claim 3 is characterized in that: It comprises an elastic clip unit (1), wherein the clamping portion (2) of the elastic clip unit (1) clamps the side of the first pair of wing plates (5.1) and the second pair of wing plates (5.2) which are away from each other, so that the first welding auxiliary plate (3.1) and the second welding auxiliary plate (3.2) tend to approach each other.

5. The device for preventing cold solder joints in the soldering process of the wiring harness and the circuit board according to claim 4, characterized in that: A first pair of position-limiting snap-in openings (8.1) and a second pair of position-limiting snap-in openings are respectively arranged on the contour edges of one side of the first welding auxiliary plate (3.1) and the second welding auxiliary plate (3.2) that are close to each other.

6. The device for preventing cold solder joints in the soldering process of the wiring harness and the circuit board according to claim 5, characterized in that: The circuit board (12) to be welded is locked on a mounting plate (9) with a window (11) by means of a plurality of mutually matching studs (10) and nuts (15); when the first welding auxiliary sheet (3.1) and the second welding auxiliary sheet (3.2) are symmetrically attached to the back of the circuit board (12) to be welded, a nut (15) is inserted into each of the first pair of limit snap-fits (8.1) and the second pair of limit snap-fits.

7. The device for preventing cold solder joints in the soldering process of the wiring harness and the circuit board according to claim 6, characterized in that: On the front side of the circuit board (12) to be welded, each threading hole (13) is surrounded by a metal welding pad (13.1).

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