Pull-off test fixture and connecting line

Abstract

The utility model belongs to the technical field of circuit board testing, and discloses a pull-off test fixture and a connecting line. The pull-off test fixture comprises a clamping piece and an elastic piece, the clamping piece is provided with a pressing part and a clamping part, and the clamping part is provided with sawteeth used for being in contact with a connecting line; the elastic piece is connected with the two clamping pieces and used for supporting the two clamping pieces and providing clamping force. The elastic piece is arranged between the two clamping pieces, the pressing force is applied to the pressing parts of the two clamping pieces, the two pressing parts are close to each other and extrude the elastic piece, and the clamping parts of the two clamping pieces are far away from each other, so that the connecting wire can be placed between the two clamping parts; under the action of the elastic piece, the two clamping parts clamp the connecting line to replace a traditional arrangement mode of screwing a nut, so that the clamping of the connecting line is prevented from being influenced by screwing force, and the accuracy of a test result can be improved; and sawteeth are arranged on the clamping part, so that the clamping force and the clamping stability can be improved.

Description

Technical Field

[0001] This utility model relates to the field of circuit board testing technology, and in particular to a pull-out test fixture and connecting wire. Background Technology

[0002] To ensure the reliability of circuit boards, a pull-out strength test is required. Pull-out strength is an important performance indicator of circuit boards, which directly affects their service life.

[0003] Typically, one end of the connector is soldered to the pad surface of the circuit board, and the other end is clamped in the test fixture of a tensile tester. Mechanical tension is applied by the tensile tester until the pad detaches from the circuit board substrate or other failures occur. In existing technology, the test fixture uses a tightening nut to clamp the connector on both sides of the jaws. The clamping force is greatly affected by the tightening force, impacting the accuracy of the test results. Furthermore, because the connector end surface is relatively smooth, the connector is prone to separating from the jaws of the test fixture during testing, making it difficult to ensure clamping stability.

[0004] That is, the existing test fixture uses a tightening nut, which has the disadvantages of the connection wire clamping being greatly affected by the tightening force, thus affecting the accuracy of the test results, and poor clamping stability. Utility Model Content

[0005] The purpose of this utility model is to provide a pull-out test fixture and connecting wire to solve the problems of existing test fixtures using tightening nuts, which have the problem that the clamping force of the connecting wire is greatly affected by the tightening force, thus affecting the accuracy of the test results, as well as the problem of poor clamping stability.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This utility model provides a pull-out test clamp for holding a connecting wire, comprising:

[0008] Two clamping members are arranged opposite each other. Each clamping member has a pressing part and a clamping part. The clamping part is provided with serrations for contacting the connecting line.

[0009] An elastic element connects to the two clamping elements respectively to support the two clamping elements and provide clamping force;

[0010] When the pressing portions of the two clamping members are pressed, the two pressing portions move closer to each other and squeeze the elastic member, and the clamping portions of the two clamping members can move away from each other to provide clamping space for accommodating the connecting wire; when the pressing portions are not pressed, the two clamping portions can move closer to each other and clamp the connecting wire under the action of the elastic member.

[0011] As an optional technical solution for a pull-off test fixture, the serrations of the two clamping parts are used to clamp the head of the connecting wire, and the clamping parts are also provided with extended protrusions. The extended protrusions of the two clamping parts are used to fit the annular surface at the connection between the head and the main wire of the connecting wire to support and limit the head.

[0012] As an optional technical solution for a pull-out test fixture, a clamping groove is provided between the two elongated protrusions, the clamping groove being used to accommodate and clamp a portion of the main wire.

[0013] As an optional technical solution for a pull-out test fixture, the extended protrusion is provided with a clamping arc surface, which is a semi-circular arc surface. The clamping arc surface is the inner groove wall of the clamping slot used to fit the main line part.

[0014] As an optional technical solution for a pull-off test fixture, the clamping part is plate-shaped. When the two clamping parts clamp the connecting line, the two clamping parts clamp the connecting line from both sides respectively and maintain a certain distance between the two clamping parts.

[0015] Alternatively, when the two clamping parts clamp the connecting line, the two clamping parts contact and mate, and the two clamping parts can wrap around and clamp the connecting line circumferentially.

[0016] As an optional technical solution for a pull-out test fixture, the clamping member is further provided with a connecting part, which connects the pressing part and the clamping part respectively, and the elastic element is disposed between the connecting parts of the two clamping members.

[0017] As an optional technical solution for pull-out test fixtures, the elastic element and the clamping element are detachably connected.

[0018] As an optional technical solution for a pull-out test fixture, the elastic element includes a torsion spring.

[0019] This utility model provides a connecting wire for use with the above-mentioned pull-out test fixture, the connecting wire comprising:

[0020] The head has a quadrilateral cross-section that matches the clamping part;

[0021] The main wire has one end for connecting to the solder pads on the circuit board and the other end for connecting to the head.

[0022] This utility model provides a connecting wire for use with the above-mentioned pull-out test fixture, the connecting wire comprising:

[0023] The head has a serrated outer surface for engaging with the serrations of the clamping part.

[0024] The main wire has one end for connecting to the solder pads on the circuit board and the other end for connecting to the head.

[0025] Beneficial effects:

[0026] This utility model provides a pull-out test fixture, which includes clamping members and elastic members. Two clamping members are arranged opposite each other. Each clamping member has a pressing part and a clamping part. The clamping part is provided with serrations for contacting the connecting wire. The elastic members connect the two clamping members respectively to support the two clamping members and provide clamping force. When the pressing part of the two clamping members is subjected to pressing force, the two pressing parts move closer to each other and squeeze the elastic member. The clamping parts of the two clamping members can move away from each other to provide clamping space for accommodating the connecting wire. Under the action of the elastic member, the two clamping parts can clamp the connecting wire. By placing an elastic element between the two clamping parts, a pressing force is applied to the pressing parts of the two clamping parts. The two pressing parts move closer to each other and squeeze the elastic element, while the clamping parts of the two clamping parts move further apart. This allows the connecting wire to be placed between the two clamping parts. When no pressing force is applied to the pressing parts, the two clamping parts clamp the connecting wire under the action of the elastic element, replacing the traditional setting method of tightening nuts. This avoids the connection wire clamping being affected by the tightening force and can improve the accuracy of test results. By providing serrations on the clamping parts, the clamping force and clamping stability can be improved.

[0027] This invention provides a connecting wire for use with a pull-out test fixture. The connecting wire includes a head and a main wire portion. One end of the main wire portion is connected to a pad on a circuit board, and the other end is connected to the head. The head has a quadrilateral cross-section that matches the clamping portion. By providing a connecting wire with a quadrilateral head instead of a traditional connecting wire with rounded ends, the clamping of the connecting wire is made more stable.

[0028] This invention also provides a connecting wire for use with a pull-out test fixture. The connecting wire includes a head and a main wire portion. One end of the main wire portion is connected to a pad on a circuit board, and the other end is connected to the head. The outer surface of the head is serrated for engaging with the serrated edge of the clamping portion. By providing a connecting wire with a serrated head instead of a traditional connecting wire with rounded ends, the engagement between the head and the clamping portion makes the clamping of the connecting wire more stable. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a pull-off test fixture in the prior art;

[0030] Figure 2 This is a schematic diagram of the pull-off test fixture and connecting wire provided in this embodiment of the utility model;

[0031] Figure 3 This is a schematic diagram of the pull-off test fixture provided in this embodiment of the utility model;

[0032] Figure 4 This is a partial structural schematic diagram of the pull-off test fixture provided in this embodiment of the utility model;

[0033] Figure 5 This is a schematic diagram of the connecting line provided in an embodiment of the present utility model.

[0034] In the picture:

[0035] 10. Tighten the nut; 20. Jaws; 30. First connecting wire; 40. Printed circuit board;

[0036] 1. Clamping component; 1a. First clamping component; 1b. Second clamping component; 11. Pressing part; 12. Clamping part; 121. Serration; 122. Extended protrusion; 123. Clamping slot;

[0037] 2. Elastic components;

[0038] 3. Connecting wire; 31. Head; 32. Main wire section. Detailed Implementation

[0039] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0040] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0043] like Figure 1 As shown, in the prior art, the bottom of the first connecting wire 30 is vertically soldered to the pad surface of the printed circuit board 40, and the jaws 20 clamp the head of the first connecting wire 30 from both sides. By tightening the screw nut 10, the size of the clamping space of the jaws 20 can be changed, so that the jaws 20 clamp the head of the first connecting wire 30 on both sides, which is greatly affected by the tightening force. The first connecting wire 30 is composed of a rigid metal wire and solder solder on the head. The head of the first connecting wire 30 is smooth, and the clamping stability is poor. The head of the first connecting wire 30 and the jaws 20 are in line contact, and the fit is poor. During the clamping process, the head of the first connecting wire 30 is easy to detach from the jaws 20.

[0044] like Figures 2 to 5 As shown, this embodiment provides a pull-off test fixture and a connecting wire 3. The pull-off test fixture is used to clamp the connecting wire 3. The connecting wire 3 includes a head 31 and a main wire portion 32. One end of the main wire portion 32 is connected to the solder pad of the circuit board, and the other end is connected to the head 31. The pull-off test fixture includes a clamping member 1 and an elastic member 2. Two clamping members 1 are arranged opposite each other. The clamping member 1 has a pressing part 11 and a clamping part 12. The clamping part 12 is provided with serrations 121 for contacting the connecting wire 3. The elastic member 2 connects the two clamping members 1 respectively to support the two clamping members 1 and provide clamping force. When the pressing part 11 of the two clamping members 1 is subjected to pressing force, the two pressing parts 11 move closer to each other and squeeze the elastic member 2. The clamping parts 12 of the two clamping members 1 can move away from each other to provide clamping space for accommodating the connecting wire 3. Under the action of the elastic member 2, the two clamping parts 12 can clamp the connecting wire 3.

[0045] Optionally, the head 31 of the connecting wire 3 has a quadrilateral cross-section that matches the clamping part 12. By providing a connecting wire 3 with a quadrilateral head 31 instead of the conventional first connecting wire 30 with rounded ends, the clamping of the connecting wire 3 is more stable.

[0046] Optionally, the outer surface of the head 31 of the connecting wire 3 is serrated to engage with the serrations 121 of the clamping part 12. By providing a connecting wire 3 with a serrated head 31 instead of the traditional first connecting wire 30 with a smooth end, when the pull-out test fixture clamps the connecting wire 3, the connecting wire 3 engages with the clamping part 12, effectively increasing the contact area between the clamping part 1 and the connecting wire 3, improving the force direction of the head 31 of the connecting wire 3 during pull-out, and making the clamping of the head 31 of the connecting wire 3 more stable during the pull-out process.

[0047] By setting an elastic element 2 between the two clamping parts 1, a pressing force is applied to the pressing part 11 of the two clamping parts 1. The two pressing parts 11 move closer to each other and squeeze the elastic element 2, while the clamping parts 12 of the two clamping parts 1 move further apart, so that the connecting wire 3 can be placed between the two clamping parts 12. When the pressing part 11 is not pressed, the two clamping parts 12 clamp the connecting wire 3 under the action of the elastic element 2, which replaces the traditional setting method of tightening the nut 10. This avoids the clamping of the connecting wire 3 being affected by the tightening force and can improve the accuracy of the test results. By providing serrations 121 on the clamping part 12, the clamping force and clamping stability can be improved.

[0048] Specifically, the clamping part 12 is plate-shaped. When the two clamping parts 12 clamp the connecting line 3, they clamp the connecting line 3 from both sides and maintain a certain distance between them; or, when the two clamping parts 12 clamp the connecting line 3, they contact and align, and can wrap around and clamp the connecting line 3 circumferentially. By setting the two clamping parts 12 to clamp from both sides or to clamp around the connecting line 3, the contact area between the clamping parts 12 and the head 31 of the connecting line 3 is ensured, thereby ensuring clamping stability and preventing the head 31 from contacting the clamping parts 12. In this embodiment, the two clamping members 1 are a first clamping member 1a and a second clamping member 1b, and the clamping parts 12 of the first clamping member 1a and the second clamping member 1b clamp the connecting line 3 from both sides.

[0049] Furthermore, the serrations 121 of the two clamping portions 12 are used to clamp the head 31 of the connecting wire 3. The clamping portions 12 are also provided with elongated protrusions 122. The elongated protrusions 122 of the two clamping portions 12 are used to fit against the annular surface at the connection between the head 31 and the main wire portion 32 of the connecting wire 3 to support and limit the head 31. By providing serrations 121 and elongated protrusions 122 on the clamping portions 12, when clamping the connecting wire 3, the serrations 121 of the two clamping portions 12 contact the head 31 of the connecting wire 3 from both sides. The elongated protrusions 122 support and limit the annular surface at the connection between the head 31 and the main wire portion 32, which can stop the head 31 and effectively reduce the possibility of the head 31 disengaging from the clamping portions 12, thus helping to improve the clamping stability of the head 31.

[0050] Furthermore, a clamping groove 123 is provided between the two elongated protrusions 122. The clamping groove 123 is used to accommodate and clamp part of the main wire portion 32. The elongated protrusions 122 are provided with a clamping arc surface, which is a semi-circular arc surface. The clamping arc surface is the inner groove wall of the clamping groove 123 and is used to press against the main wire portion 32. By forming the clamping groove 123 through the two elongated protrusions 122, while clamping the head 31, the clamping groove 123 is used to clamp the main wire portion 32, so that the main wire portion 32 can be locked by the clamping groove 123 and cannot move left or right, thus avoiding the movement of the connecting wire 3 during the pull-out process and affecting the test results.

[0051] In this embodiment, the clamping member 1 is further provided with a connecting portion, which connects the pressing portion 11 and the clamping portion 12 respectively. The elastic member 2 is disposed between the connecting portions of the two clamping members 1. Both clamping members 1 extend in a vertical direction. The serration 121 is disposed inside the clamping portion 12 and below the elastic member 2. The elongated protrusion 122 is disposed at the bottom of the clamping portion 12. The clamping member 1 is an integral structure. In other embodiments, the clamping member 1 may also be a split structure.

[0052] Optionally, the elastic element 2 is detachably connected to the clamping element 1; the elastic element 2 is a torsion spring. The elastic element 2 can be snapped onto the clamping element 1; the torsion spring can be made of stainless steel or carbon steel.

[0053] The following is a detailed description of the use of the pull-off test fixture:

[0054] The connecting wire 3 consists of a rigid metal wire and a head solder. Before the pull-out strength test, the bottom of the rigid metal wire is vertically soldered to the pad on the circuit board using solder. Press the pressing part 11 of the two clamping parts 1 so that the two pressing parts 11 are close to each other and squeeze the elastic part 2, so that the clamping parts 12 of the two clamping parts 1 are far apart. At this time, the pull-out test fixture is in the bottom open state.

[0055] Then, the head 31 of the connecting wire 3 is placed in the clamping space between the two clamping parts 12. At this time, it is necessary to ensure that the position of the head 31 of the connecting wire 3 corresponds to the position of the clamping space, so that when the two clamping parts 12 clamp the head 31 of the connecting wire 3, the two extended protrusions 122 can clamp the main wire part 32. The annular surface at the connection between the head 31 of the connecting wire 3 and the main wire part 32 can fit against the top surface of the extended protrusion 122, so that the extended protrusion 122 can provide support for the connecting wire 3.

[0056] Finally, release the two pressing parts 11, and the elastic element 2 returns to its original shape. Under the action of the elastic element 2, the two clamping parts 12 move closer to each other and remain clamped. The serrations 121 of the clamping parts 12 contact and clamp the head 31 of the connecting wire 3. Set the upward pulling speed of the tensile tester and start the pull-out tester. At this time, the pull-out test fixture is pulled vertically upward by the tensile force, and the connecting wire 3 changes from a relaxed state to a taut state. The pull-out test fixture continues to move upward until the solder pad is pulled off the surface of the circuit board. The maximum instantaneous pull-out force can be converted into the pull-out strength.

[0057] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A pull-off test fixture, characterized in that, For clamping the connecting wire, including: Two clamping members (1) are arranged opposite each other. The clamping member (1) has a pressing part (11) and a clamping part (12). The clamping part (12) is provided with serrations (121) for contacting the connecting line. The elastic element (2) is connected to the two clamping elements (1) respectively to support the two clamping elements (1) and provide clamping force; When the pressing part (11) of the two clamping members (1) is pressed, the two pressing parts (11) move closer to each other and squeeze the elastic member (2), and the clamping parts (12) of the two clamping members (1) can move away from each other to provide clamping space for accommodating the connecting wire; when the pressing part (11) is not pressed, the two clamping parts (12) can move closer to each other and clamp the connecting wire under the action of the elastic member (2).

2. The pull-out test fixture according to claim 1, characterized in that, The serrations (121) of the two clamping parts (12) are used to clamp the head (31) of the connecting line. The clamping parts (12) are also provided with elongated protrusions (122). The elongated protrusions (122) of the two clamping parts (12) are used to fit the annular surface at the connection between the head (31) and the main line part (32) of the connecting line to support and limit the head (31).

3. The pull-out test fixture according to claim 2, characterized in that, A clamping groove (123) is provided between the two elongated protrusions (122), the clamping groove (123) being used to receive and clamp a portion of the main line portion (32).

4. The pull-off test fixture according to claim 3, characterized in that, The extended protrusion (122) is provided with a clamping arc surface, which is a semi-circular arc surface. The clamping arc surface is the inner groove wall of the clamping slot (123) for fitting the main line part (32).

5. The pull-off test fixture according to claim 1, characterized in that, The clamping part (12) is plate-shaped. When the two clamping parts (12) clamp the connecting line, the two clamping parts (12) clamp the connecting line from both sides respectively and maintain a certain interval between the two clamping parts (12). Alternatively, when the two clamping parts (12) clamp the connecting line, the two clamping parts (12) contact and abut, and the two clamping parts (12) can wrap around and clamp the connecting line circumferentially.

6. The pull-out test fixture according to claim 1, characterized in that, The clamping member (1) is also provided with a connecting part, which connects the pressing part (11) and the clamping part (12) respectively, and the elastic member (2) is disposed between the connecting parts of the two clamping members (1).

7. The pull-out test fixture according to claim 6, characterized in that, The elastic element (2) is detachably connected to the clamping element (1).

8. The pull-out test fixture according to claim 6, characterized in that, The elastic element (2) includes a torsion spring.

9. A connecting wire, characterized in that, For use with a pull-out test fixture as described in any one of claims 1-8, the connecting wire includes: The head (31) has a quadrilateral cross-section that matches the clamping part (12); The main line (32) has one end for connecting to the pads on the circuit board and the other end for connecting to the head (31).

10. A connecting wire, characterized in that, For use with a pull-out test fixture as described in any one of claims 1-8, the connecting wire includes: The head (31) has a serrated outer surface for engaging with the serrations (121) of the clamping part (12); The main line (32) has one end for connecting to the pads on the circuit board and the other end for connecting to the head (31).

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