CN220533312U - Jig for welding PCB and workbench for welding and testing PCB - Google Patents

Abstract

The utility model provides a jig for welding a PCB, wherein the PCB comprises a plurality of terminal pads and test points which are arranged in pairs. This tool includes: a body; a concave portion; a plurality of terminal placement parts provided in the body and for accommodating the respective terminals, one ends of which are to be soldered to the respective terminal pads; and the probes are arranged in the body and correspond to a pair of terminal pads and test points. One end of each probe is electrically connectable with the free end of the corresponding terminal after the corresponding terminal is placed in the terminal placing portion. The present utility model also provides a workbench for soldering and testing a PCB, comprising: the former jig; a welding station; and a test station. The jig is movable between a welding station and a testing station. The utility model can conveniently and efficiently finish the welding operation of the PCB, and especially can realize quick and reliable test on the welding quality of the terminals after the welding operation so as to determine whether all the terminals are successfully welded to the corresponding terminal pads.

Description

Jig for welding PCB and workbench for welding and testing PCB

Technical Field

The utility model provides a jig for welding a PCB and a workbench for welding and testing the PCB.

Background

In many products, PCBs (printed circuit boards) are indispensable components on which various electronic devices need to be soldered. Taking the microphone as an example, a narrow elongate PCB is included in its handle, the chip or the like associated with the microphone being soldered to the PCB, and the PCB also including terminals soldered thereto which are to be connected to associated components external to the PCB, such as a pick-up, power cord or the like.

Currently, there are a variety of soldering platforms to accomplish semi-automatic, even automatic soldering of PCBs. However, in the prior art, after the terminals are soldered to the PCB, the soldering quality of the terminals is often observed only by human eyes to check whether there is a cold soldering or a missing soldering. Manual inspection is often inaccurate and inefficient.

Thus, there is a lack of accurate, fast and effective terminal weld quality testing schemes in the art.

Disclosure of Invention

In view of the above-mentioned problems and needs, the present disclosure proposes a novel technical solution, which solves the above-mentioned problems and brings about other technical effects due to the following technical features.

The utility model provides a jig for welding a PCB, the PCB comprises a plurality of terminal pads and test points which are arranged in pairs, and the jig is characterized in that the jig comprises: a body; a recess recessed from an upper surface of the body for accommodating the PCB; a plurality of terminal placement parts provided in the body and for accommodating respective terminals, one ends of which are to be soldered to respective terminal pads; and a plurality of probes disposed in the body and each corresponding to a pair of terminal pads and test points, wherein one end of each probe is electrically connectable with a free end of a corresponding terminal after the corresponding terminal is placed in the terminal placement portion.

Preferably, each probe is electrically connected to the free end of the corresponding terminal by an electrical connection provided in the body.

Preferably, the body further comprises a positioning post for passing through a positioning hole on the PCB.

Preferably, the other end of each probe is electrically connected to a respective test point after the PCB is received in the recess such that each probe is connected in series between a respective pair of terminal pads and the test point after the respective terminal is soldered to the respective terminal pad to form a sub-circuit, all of which are connected in series by conductive traces on the PCB to form a test sub-circuit.

Preferably, the device further comprises a power supply, a switch and an indicator, which are arranged on the body and are connected in series with the test sub-circuit to form a test loop, so that when the switch is closed, the indicator gives an on indication.

Preferably, the indicator is an indicator light and/or the switch is a microswitch.

The present utility model also provides a workbench for soldering and testing a PCB, comprising: a jig as described above; a welding station; and a test station, wherein the jig is movable between the welding station and the test station.

Preferably, the table further includes a pressing plate for pressing the PCB after the PCB is placed in the recess.

Preferably, the workbench further comprises a guide rail for guiding the jig to move between the welding station and the testing station.

Preferably, the switch of the jig is disposed at a side portion of the body, and the workbench further includes a triggering portion for triggering the switch when the jig moves to the testing station along the guide rail.

By the utility model, the welding operation of the PCB can be conveniently and efficiently finished, and particularly, after the welding operation is finished, the welding quality of the terminals can be rapidly and reliably tested to determine whether all the terminals are successfully welded to the corresponding terminal pads.

Drawings

FIGS. 1 and 2 are perspective views of a jig according to a preferred embodiment of the present utility model viewed at different angles;

FIG. 3 is an enlarged view of portion A of FIG. 2;

FIG. 4 is an enlarged view of portion B of FIG. 2;

fig. 5 is a schematic diagram of a test circuit according to a preferred embodiment of the present utility model.

Detailed Description

In order to make the objects, technical solutions and advantages of the technical solutions of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings of the specific embodiments of the present disclosure. Like reference numerals in the drawings denote like parts. It should be noted that the described embodiments are some, but not all embodiments of the present disclosure. All other embodiments, which can be made by one of ordinary skill in the art without the need for inventive faculty, are within the scope of the present disclosure, based on the described embodiments of the present disclosure.

Possible implementations within the scope of the present disclosure may have fewer components, have other components not shown in the drawings, different components, differently arranged components, differently connected components, etc., than the examples shown in the drawings. Furthermore, two or more of the elements in the figures may be implemented in a single element or a single element shown in the figures may be implemented as multiple separate elements.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like in the description and in the claims, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Where the number of components is not specified, the number of components may be one or more; likewise, the terms "a," "an," "the," and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "mounted," "configured," "connected," or "connected" and the like are not limited to physical or mechanical mounting, configuration, connection, but may include electrical mounting, configuration, connection, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to denote relative positional relationships when the apparatus is in use or positional relationships shown in the drawings, and when the absolute position of the object to be described is changed, the relative positional relationships may be changed accordingly.

Referring to the perspective views of the jig according to the preferred embodiment of the present utility model, which are shown in fig. 1-2, viewed from different angles, the present utility model provides a jig for soldering PCBs, which can cooperate with a table for processing PCBs to complete soldering of PCBs, and can also complete subsequent terminal soldering quality testing operations. This tool includes: the probe comprises a body, a concave part, a plurality of terminal placing parts and a plurality of probes.

It should be appreciated that although the preferred embodiment illustrated in the drawings shows the body 1 comprising two recesses 2 for accommodating two PCBs simultaneously, the body 1 may comprise any suitable number of recesses, such as one or more than two, as required. In order to show the structure of the jig of the present utility model, the jig shown in the drawings accommodates a PCB in only one recess 2 and does not accommodate a PCB in the other recess.

In addition, to assist in the terminal solder quality testing operation, the PCB also includes a plurality of terminal pads and test points arranged in pairs. Taking the PCB for a microphone as an example, 5 terminals 35-39 (as shown in fig. 3-4) are soldered on the PCB, the PCB has 5 terminal pads J5-9 corresponding to the terminals, and test points TP11, TP10, TP3, TP28, TP29 (as shown in fig. 5) disposed in pairs with each terminal pad J5-9, that is, five pairs of terminal pads and test points are shared on the PCB. The test points may be formed on the PCB by a material and process similar to the pads, which may be, for example, copper disks of a certain size.

In brief, at the time of the soldering operation, the terminals 35 to 39 to be soldered may be placed in the terminal placing portion, then the PCB is placed in the recess 2, and the terminals 35 to 30 are passed through the holes on the respective pads J5 to 9, and then the pads and terminals are soldered together by soldering or the like, for example. The above test points will be used in the subsequent terminal welding quality test operation, which will be described later.

The specific constitution of the jig according to the preferred embodiment of the present utility model will be specifically described below.

The recess 2 of the jig according to the preferred embodiment is recessed from the upper surface of the body 1 for accommodating a PCB. The contour of the recess 2 conforms, for example, to the contour of the PCB to achieve a compact accommodation. Preferably, to facilitate accurate placement of the PCB into the recess 2, the body 1 may further comprise a positioning post (not marked in the figures) for passing through a positioning hole on the PCB.

A plurality of terminal placement portions (not labeled) of the jig are provided in the body 1 and serve to accommodate respective terminals, one ends of which are to be soldered to respective terminal pads. The terminal placing portion may be, for example, any suitable groove formed on the body 1, and its shape may be designed according to the specific shape of the terminal.

Referring to fig. 2, a PCB for a microphone may include two types of terminals and may be soldered to the PCB at the locations shown in fig. 2 a and B. Specifically, fig. 3 shows an enlarged view of the portion a, and the three terminals 37 to 39 are meandering strip-shaped terminals, and the corresponding terminal placing portions may be shallow grooves (not shown) machined in the body 1 to accommodate one ends to be soldered to the corresponding terminal pads. Similarly, fig. 4 shows an enlarged view of section B, showing two terminals 35-36 having a shorter length.

With further reference to fig. 3-4, a plurality of probes 45-49 of the fixture are disposed in the body 1 and each corresponds to a pair of terminal pads and test points as previously described.

One end of each probe can be electrically connected with a free end of a corresponding terminal (i.e., an end of the terminal to be connected with an external component) after the corresponding terminal is placed in the terminal placement portion. Depending on the position of the terminals relative to the probes and the position of the probes in the body, the probes may be electrically connected to the free ends of the respective terminals by electrical connectors provided in the body (as shown in fig. 3). The electrical connection is, for example, a conductive post, a conductive rod, a conductive strip, a wire, or the like.

As shown in fig. 3, the electrical connector 5 is implemented as a conductive post, one end of which is exposed outside the body 1, and the exposed portion is rounded with a certain area so as to be in full contact with the free ends of the terminals 37 to 39 after the terminals 37 to 39 are placed in the terminal placing portion. The other end of the electrical connector 5 is electrically connected to a corresponding probe 47-49. In addition, since the terminals 37 to 39 are meandering strip-shaped terminals having a certain length, in order to ensure reliable contact of the free ends of the terminals 37 to 39 with the electrical connector 5, a holding block 6 (shown in fig. 3) may be provided to hold the free ends thereof against the electrical connector 5 after the terminals 37 to 39 are placed in the terminal placing portion.

In addition, the other end of each probe (i.e., the end exposed into the recess 2 in the drawing) is electrically connected (i.e., directly contacted) with the corresponding test point after the PCB is received in the recess, such that each probe is connected in series between the corresponding pair of terminal pads and the test point after the corresponding terminal is soldered to the corresponding terminal pad, to form a sub-circuit. In turn, all of the sub-circuits are connected in series, for example by conductive traces on the PCB, to form a test sub-circuit.

Furthermore, the probe is, for example, a MIUMI probe or any other suitable probe. In addition, in order to ensure reliable contact of the probes with the corresponding test points, the heads of the probes selected are spring biased and have a certain elastic travel (e.g., a travel of 2 mm), so that reliable contact of the probes with the test points can be maintained by depressing the PCB.

The basic principle of the test circuit is shown in fig. 5, which shows in block the terminal pads and test points arranged in pairs on the PCB. After the terminals are soldered to the corresponding terminal pads, the test points, probes and the soldered together terminals, pads together form a series-connected sub-circuit (indicated by the arrow drawn through each box), and all the sub-circuits are connected in series by providing appropriate electrical connection means (e.g., conductive traces preformed on the PCB or wires provided in the housing 1, etc.) on the PCB or the housing 1 to form a test sub-circuit, so that it is possible to determine whether the terminals have been soldered to the terminal pads successfully by testing the test sub-circuit.

According to a preferred embodiment of the utility model, the fixture itself integrates the relevant devices for testing. Specifically, the fixture may further include a power source, a switch, and an indicator, all disposed on the body, and connected in series with the test sub-circuit to form a complete test circuit, and the indicator may be an indicator lamp H1 according to a preferred embodiment. The switch may be a micro switch S1.

During testing, if each terminal is successfully welded to the bonding pad, when the switch is closed, the test loop is conducted, and the indicator lamp H1 is lighted; otherwise, if the indicator lamp H1 is not turned on, it indicates that there is a terminal that has not been welded successfully.

It will be appreciated that the indicator may be a buzzer or any other suitable indication means in addition to the indicator light. It will also be appreciated that with the above principles in mind, testing of the test sub-circuits is also accomplished by components other than the fixture, for example, power supplies, indicators, switch lights may be provided on the soldering station (rather than on the fixture) and connected to the test sub-circuits through appropriate interfaces.

Further, the present utility model also provides a workbench (not shown) for soldering and testing a PCB, comprising the jig, soldering station and testing station as described above. The jig is movable between a welding station and a testing station.

To facilitate the soldering operation of the PCB, the table may further comprise a pressing plate for pressing the PCB after it is placed in the recess 2. At the same time, as the probe head is spring biased, the platen also ensures that the PCB reliably presses the probe head into reliable contact with the test site.

Further preferably, the work table may further include a guide rail for guiding the jig to move between the welding station and the testing station so that an operator can move the jig along the guide rail to the testing station after the welding is completed to perform a terminal welding quality testing operation.

To further promote automation, the switch of the jig may be disposed at a side portion of the body, and the workbench further includes a triggering portion for triggering the switch in the test loop when the jig moves to the test station along the guide rail. In a preferred embodiment, the triggering portion is, for example, a bump formed on the table base, which bump will trigger the micro switch to complete the test circuit when the jig moves to the test station in case the switch is implemented as a micro switch. It will be appreciated that the switches in the test circuit may be any other suitable switch, such as a photoelectric switch, a sensor or the like, and that the triggering portion is then provided as a suitable component adapted to trigger a corresponding type of switch.

The exemplary implementation of the present disclosure has been described in detail hereinabove with reference to the preferred embodiments, however, it will be understood by those skilled in the art that various modifications and adaptations to the specific embodiments described above may be made and that various combinations of the technical features and structures set forth in the present disclosure may be practiced without departing from the scope of the present disclosure, which is defined in the appended claims.

Claims (10)

1. A fixture for soldering a PCB, the PCB comprising a plurality of terminal pads and test points arranged in pairs, the fixture comprising:

a body;

a recess recessed from an upper surface of the body for accommodating the PCB;

a plurality of terminal placement parts provided in the body and for accommodating respective terminals, one ends of which are to be soldered to respective terminal pads;

a plurality of probes disposed in the body and each corresponding to a pair of terminal pads and test points,

wherein one end of each probe is electrically connectable with a free end of a corresponding terminal after the corresponding terminal is placed in the terminal placing portion.

2. The jig of claim 1 wherein each probe is electrically connected to the free end of a respective terminal by an electrical connection provided in the body.

3. The jig of claim 1, wherein the body further comprises a locating post for passing through a locating hole on the PCB.

4. A fixture according to any one of claims 1-3, wherein the other end of each probe is electrically connected to the respective test point after the PCB is received in the recess such that each probe is connected in series between the respective pair of terminal pads and the test point after the respective terminal is soldered to the respective terminal pad to form a sub-circuit, all sub-circuits being connected in series by conductive traces on the PCB to form the test sub-circuit.

5. The fixture of claim 4, further comprising a power source, a switch, and an indicator disposed on the body, and wherein the power source, the switch, and the indicator are connected in series with the test sub-circuit to form a test loop such that when the switch is closed, the indicator issues an on indication.

6. The jig of claim 5, wherein the indicator is an indicator light and/or the switch is a microswitch.

7. A workstation for soldering and testing a PCB, comprising:

the jig of any one of claims 5-6;

a welding station; and

the test station is provided with a test station,

wherein, the tool can be moved between welding station and test station.

8. The table of claim 7, further comprising a pressing plate for pressing the PCB after the PCB is placed in the recess.

9. The workstation of claim 7, further comprising a guide rail for guiding movement of the jig between a welding station and a testing station.

10. The table of claim 9, wherein the switch of the jig is disposed at a side of the body, and the table further comprises a triggering portion for triggering the switch when the jig moves along the guide rail to a test station.