PCB (Printed Circuit Board) welding positioning structure for preventing solder skips of contact pins

Abstract

The utility model provides a PCB welding positioning structure for preventing contact pin solder skips, comprising a PCB, a contact pin and a positioning tool, the PCB is provided with an assembly hole, the contact pin is inserted into the assembly hole and is in clearance fit with the assembly hole, and the positioning tool limits the upper end and / or the lower end of the PCB and the contact pin to maintain the clearance fit between the contact pin and the assembly hole; according to the invention, the conventional design thought of interference fit between the contact pins and the assembly holes of the PCB is broken through, the contact pins and the assembly holes of the PCB are designed to be in clearance fit, clearance fit between the contact pins and the plurality of assembly holes before welding is maintained through an external positioning tool, the positioning tool is removed after the welding process is completed, and if a solder skipping situation occurs, the contact pins can be accurately positioned. And the quality inspection device can discover in time.

Description

Technical Field

[0001] The utility model relates to the technical field of PCB circuit boards, and specifically relates to a PCB welding positioning structure for preventing pin missed soldering. Background Art

[0002] Pins are metal pins or connectors on a PCB circuit board, which are used to achieve the connection and communication between electronic components and between electronic components and external devices; in the prior art, for the convenience of assembly, the pins need to be assembled on the PCB board first, and then the pins are soldered to the PCB board. For preliminary positioning before soldering, the pins are usually press-fitted and clamped with the assembly holes on the PCB circuit board for subsequent soldering.

[0003] For example, a PCB pin monomer, a PCB pin split board and a buzzer provided by a Chinese utility model patent with the authorization publication number CN211700669U. The PCB pin monomer among them includes a pin and a PCB split board. An assembly hole is provided on the PCB split board, and the pin is inserted into the assembly hole. The part of the pin in contact with the side wall of the assembly hole is a clamping section, and protrusions are provided on the clamping section. When the clamping section is inserted into the assembly hole, the protrusions are pressed against the side wall of the assembly hole, so that the relative position between the pin inserted into the assembly hole and the PCB board is fixed, forming the PCB pin monomer.

[0004] However, the applicant found in the production process that since the pins are clamped and fitted with the assembly holes on the PCB board, they will be clamped on the PCB board without soldering after preliminary assembly, resulting in difficulty in identifying whether there is missed soldering during quality inspection; especially in the production line, automatic soldering is achieved through programming, and the pins are soldered one by one according to the programming sequence to complete the soldering of the pins on the entire PCB board. If there is missed soldering, the entire PCB board will not be soldered, but the overall function test will show normal during detection, and the missed soldering is not easy to identify. When it flows into the market, it has no function, causing dissatisfaction among customers.

[0005] Therefore, in order to avoid the problem of difficult identification of missed soldering, the inventor designs a PCB welding positioning structure for preventing pin missed soldering. Content of the Utility Model

[0006] The purpose of the utility model is to overcome the defects and deficiencies existing in the prior art, and to provide a PCB welding positioning structure for preventing pin missed soldering. The technical solution adopted by the utility model is as follows:

[0007] A PCB welding positioning structure for preventing pin missed soldering includes a PCB board and pins. Assembly holes are provided on the PCB board, and a positioning tooling is further included. The pins are inserted into the assembly holes and are in clearance fit with the assembly holes, and the positioning tooling limits the upper end or the lower end of the pins to maintain the clearance fit between the pins and the assembly holes.

[0008] Further, there are solder joints on the assembly holes. When the pin is inserted into the assembly hole with a clearance fit, the pin is in non-contact fit with the solder joint.

[0009] Preferably, there is at least one assembly area on the PCB board. A number of assembly holes are regularly arranged in each assembly area and correspond one by one to a number of pins. And each assembly area is equipped with a positioning tooling corresponding in shape and position to maintain the clearance fit between the number of pins and the number of assembly holes before welding.

[0010] Preferably, a number of pins corresponding to a number of assembly holes in each assembly area are respectively connected to a number of wires, and the number of wires connected to the number of pins in each assembly area are collected in a wire harness tube.

[0011] Preferably, the pin includes a narrow part and a wide part. The narrow part passes through the assembly hole from bottom to top with a clearance fit, and the diameter of the wide part is larger than that of the assembly hole. An installation seat is arranged below the assembly area of the PCB board, and there is an installation groove on the installation seat. The wide part of the pin is arranged in the installation groove; there is a limiting block in the installation groove, and the wide part of the pin is provided with a limiting flap inclined downward. When the wide part of the pin enters the installation groove from bottom to top, the limiting block limits the limiting flap so that the pin cannot escape from the installation groove.

[0012] Preferably, the assembly hole is a round hole, and the minimum clearance between the pin and the inner wall of the assembly hole is 0.1 mm.

[0013] The beneficial effects of the present utility model are as follows: The inventor of the present utility model breaks through the conventional design idea of interference fit between the pin and the assembly hole of the PCB board, designs the clearance fit between the pin and the assembly hole of the PCB board, and uses an external positioning tooling to maintain the clearance fit between the pin and a number of assembly holes before welding. After the welding process is completed, the positioning tooling is removed. If there is a situation of missed welding, the quality inspection device can detect it in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, obtaining other drawings without creative efforts still belongs to the scope of the present utility model.

[0015] Figure 1 It is a schematic structural diagram of the steering wheel function module in Embodiment 1;

[0016] Figure 2 For Figure 1Enlarged view of area A in [the figure];

[0017] Figure 3 Is a cross-sectional view of the mating structure of the PCB board, the pin, and the mounting base in Embodiment 1;

[0018] Figure 4 Is Figure 3 Enlarged view of area B in [the figure];

[0019] Figure 5 Is a schematic structural diagram of the pin in Embodiment 1;

[0020] Figure 6 Is a schematic diagram of the mating of the pin and the mounting base in Embodiment 1;

[0021] Figure 7 Is a schematic diagram of the mating of the pin and the assembly hole in Embodiment 1;

[0022] In the figure, 1 - PCB board, 101 - assembly hole, 2 - pin, 21 - narrow part, 22 - wide part, 23 - limit retaining piece, 3 - mounting base, 301 - mounting groove, 31 - limit block. Detailed implementation method

[0023] To make the objectives, technical solutions, and advantages of the present utility model clearer, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] The direction and position terms mentioned in the present utility model, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "top", "bottom", "side", etc., are only references to the direction or position of the accompanying drawings. Therefore, the direction and position terms used are for explaining and understanding the present utility model, rather than limiting the protection scope of the present utility model.

[0025] Embodiment 1

[0026] As Figures 1-4 、 Figure 7 shown, a functional module of a steering wheel, which applies a PCB welding positioning structure for preventing pin leakage welding during production, includes a PCB board 1 and a pin 2. The PCB board 1 is provided with an assembly hole 101, and also includes a positioning tooling. The pin 2 is inserted into the assembly hole 101 and has a clearance fit with the assembly hole 101. The positioning tooling includes upper and lower clamping plates. After the sheet-shaped PCB board 1 and the pin 2 are initially in clearance fit, the wire of the pin 2 is bent (at this time, the 90-degree bend of the wire relative to the pin 2 also plays a preliminary positioning role), so that the PCB board 1 with the pin 2 installed is clamped between the upper and lower clamping plates, and the upper clamping plate is provided with a through hole exposing the area to be welded on the PCB board, and the lower clamping plate is provided with a positioning groove and a wire groove for the PCB board to be embedded to maintain the clearance fit between the pin 2 and the assembly hole 101.

[0027] The assembly hole 101 has a solder joint. When the pin 2 is inserted into the assembly hole 101 with a clearance fit, the pin 2 is in non-contact fit with the solder joint.

[0028] The PCB board 1 has at least one assembly area. A number of assembly holes 101 are regularly arranged in each assembly area and correspond one by one to a number of pins 2. And each assembly area is equipped with a positioning tool or a positioning groove with corresponding shape and position to maintain the clearance fit between the number of pins 2 and the number of assembly holes 101 before welding. During welding, the area to be welded on the PCB board is welded, and the upper and lower clamping plates are removed after welding.

[0029] A number of pins 2 corresponding to a number of assembly holes 101 in each assembly area are respectively connected to a number of wires. The number of wires connected to the number of pins 2 in each assembly area are collected in a wire tube. When bending, the wire tube is directly bent, and the lower clamping plate is provided with a wire groove for the wire tube to be embedded.

[0030] The pin 2 includes a narrow part 21 and a wide part 22. The narrow part 21 passes through the assembly hole 101 from bottom to top with a clearance fit, and the diameter of the wide part 22 is larger than that of the assembly hole 101.

[0031] As Figures 5-6 shown, an installation seat 3 is cooperatively arranged below the assembly area of the PCB board 1. The installation seat 3 has an installation groove 301, and the wide part 22 of the pin 2 is arranged in the installation groove 301; there is a limiting block 31 in the installation groove 301, and the wide part 22 of the pin 2 is provided with a limiting flap 23 inclined downward. The limiting block 31 limits the limiting flap 23 to prevent the pin 2 from being disengaged downward from the installation groove 301.

[0032] In this embodiment, the assembly hole 101 is a round hole, and the length and width dimensions of the pin are set to be 0.65 0 -0.1 mm and 0.70 0 -0.1 mm respectively; the size of the round hole is set to be φ1.15 ± 0.08 mm, and the minimum clearance between the pin and the inner wall of the assembly hole is 0.1 mm.

[0033] The above-disclosed are only the preferred embodiments of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A PCB welding positioning structure for preventing pin missed soldering, comprising a PCB board (1) and pins (2), wherein an assembly hole (101) is provided on the PCB board (1), and it is characterized in that: It further includes a positioning tooling. The pin (2) is inserted into the assembly hole (101) and has a clearance fit with the assembly hole (101), and the positioning tooling positions and limits the PCB board and the pin (2) to maintain the clearance fit between the pin (2) and the assembly hole (101).

2. The PCB welding positioning structure for preventing pin missed soldering according to claim 1, characterized in that: There are solder joints on the assembly hole (101). When the pin (2) is inserted into the assembly hole (101) and has a clearance fit with the assembly hole (101), the pin (2) is in non-contact fit with the solder joints.

3. A PCB welding positioning structure for preventing pin soldering omission according to claim 1, characterized in that: There is at least one assembly area on the PCB board (1). A number of assembly holes (101) are regularly arranged in each assembly area and correspond one-to-one with a number of pins (2), and each assembly area is equipped with a positioning tooling corresponding in shape and position to maintain the clearance fit between the number of pins (2) and the number of assembly holes (101).

4. A PCB welding positioning structure for preventing pin leakage welding according to claim 3, characterized in that: A number of wires are respectively connected to the number of pins (2) corresponding to the number of assembly holes (101) in each assembly area, and the number of wires connected to the number of pins (2) in each assembly area are collected in a wire harness tube.

5. A PCB welding positioning structure for preventing pin leakage welding according to claim 1, characterized in that: The pin (2) includes a narrow part (21) and a wide part (22). The narrow part (21) passes through the assembly hole (101) from bottom to top and has a clearance fit with the assembly hole (101), and the diameter of the wide part (22) is larger than that of the assembly hole (101).

6. A PCB soldering positioning structure for preventing pin soldering omission, characterized in that: An installation base (3) is arranged in a matching manner below the PCB board (1). There is an installation groove (301) on the installation base (3), and the wide part (22) of the pin (2) is arranged in the installation groove (301).

7. A PCB welding positioning structure for preventing pin soldering omission according to claim 1, characterized in that: The assembly hole (101) is a round hole, and the minimum clearance between the pin (2) and the inner wall of the assembly hole (101) is 0.1 mm.

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