PPTC assembly welding jig plate

Abstract

The utility model belongs to the technical field of fuse production and manufacture, concretely relates to a PPTC assembly welding jig board, including jig board, the jig board is provided with at least one slot, the slot is sequentially provided with first pin area, first electrode piece support area, second electrode piece support area and second pin area along the length direction, the position of the slot corresponding the first pin area and second pin area is the open -work structure, the depth of first electrode piece support area is less than the depth of second electrode piece support area, the utility model discloses through optimizing jig board structure, solves the problem that the assembly jig can not be fixed in position.

Description

Technical Field

[0001] This utility model belongs to the technical field of fuse manufacturing, specifically relating to a PPTC assembly and welding fixture plate. Background Technology

[0002] Self-resetting fuses (PPTCs) are widely used in overcurrent protection circuits. Depending on the application, their structures mainly include through-hole, surface mount, and case-type designs. Case-type PPTCs employ a "sandwich" design, with two tin-plated brass electrodes at the top and bottom, and the PPTC core layer in the middle, assembled using solder paste. This unique structural design combines the characteristics of both through-hole and surface mount products. The ends of the two electrodes resemble the pads of surface mount products and the pins of through-hole products, allowing for surface mount mounting on the circuit board while ensuring that the PTC core layer does not directly contact the bottom circuit board, thus increasing heat dissipation.

[0003] In the process of realizing this utility model, the inventors discovered that the prior art has at least the following problems:

[0004] Existing assembly fixtures cannot provide limiting and fixing, which easily leads to inaccurate alignment between structural components, causing displacement of structural components and resulting in products with poor appearance. Utility Model Content

[0005] The purpose of this utility model is to provide a PPTC assembly welding fixture plate to address the shortcomings of the existing technology. By optimizing the fixture plate structure, the problem of the assembly fixture being unable to perform limited fixation is solved.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A PPTC assembly and welding fixture plate includes a fixture plate with at least one slot. The slot is provided with a first pin area, a first electrode support area, a second electrode support area, and a second pin area in sequence along its length. The slot has a hollow structure corresponding to the positions of the first pin area and the second pin area. The depth of the first electrode support area is less than the depth of the second electrode support area.

[0008] In some possible implementations, the depth of the first electrode support region is 0.65 mm to 0.67 mm.

[0009] In some possible implementations, the depth of the second electrode support area is 1.5 mm to 1.84 mm.

[0010] In some possible implementations, a first limiting notch is provided at the corner of the first pin area and the corner of the second pin area, and the first limiting notch penetrates the fixture plate along the thickness direction.

[0011] In some possible implementations, the first electrode support area is provided with two symmetrical first support blocks, which extend from the sidewall of the slot along the width direction, and the top surfaces of the two first support blocks are used to support the bottom surface of the first electrode sheet.

[0012] In some possible implementations, the second electrode support area is provided with two second support blocks and two third support blocks in parallel. The second support blocks extend from the side wall of the slot along the width direction, and the third support blocks extend from the side of the first support block along the length direction. The top surfaces of the two second support blocks and the two third support blocks are used to support the bottom surface of the second electrode sheet.

[0013] In some possible implementations, the first support block and the third support block are arranged in a stepped manner, with the height of the first support block being greater than the height of the third support block.

[0014] In some possible implementations, a second limiting notch is provided at the connection between the first support block and the third support block, the second limiting notch being used to limit the position of the second electrode sheet.

[0015] In some possible implementations, the first limiting notch is fan-shaped and the second limiting notch is semi-circular.

[0016] In some possible implementations, the fixture plate is provided with a plurality of slots, which are evenly spaced on the fixture plate.

[0017] One of the above technical solutions has the following beneficial effects:

[0018] This invention optimizes the fixture plate by dividing the slot into a first pin area, a first electrode support area, a second electrode support area, and a second pin area. The first pin area can limit and fix the upper electrode pins. The first electrode support area can provide support for the upper electrode during assembly and limit and fix the upper electrode to prevent planar displacement. The second electrode support area can provide support for the lower electrode during assembly and limit and fix the lower electrode to prevent planar displacement. The second pin area can limit and fix the lower electrode pins, solving the problem that the assembly fixture cannot limit and fix them. This invention restricts the displacement and rotation of the electrodes and plane during the assembly of PPTC products, ensuring the assembly consistency of the various components of the PPTC product. Attached Figure Description

[0019] The features, advantages and technical effects of exemplary embodiments of the present invention will now be described with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the various regions of this utility model.

[0021] Figure 2 This is a schematic diagram of the slot structure of this utility model.

[0022] Figure 3 This is a schematic diagram of the fixture plate of this utility model.

[0023] The reference numerals in the attached figures are explained as follows:

[0024] 1-First pin area;

[0025] 2-First electrode support area; 21-First support block;

[0026] 3-Second electrode support area; 31-Second support block; 32-Third support block;

[0027] 4-Second pin area;

[0028] 5-First limiting notch;

[0029] 6-Second limit gap;

[0030] X - Length direction;

[0031] Y-width direction;

[0032] Z - Thickness direction. Detailed Implementation

[0033] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The term "comprising" as used throughout the specification and claims is an open-ended term and should be interpreted as "comprising but not limited to." "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error.

[0034] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] The present invention will be further described in detail below with reference to the accompanying drawings, but this is not intended to limit the present invention.

[0037] Example 1

[0038] Because existing assembly fixtures cannot provide limiting and fixing, inaccurate alignment between structural components is prone to occur, causing displacement of structural components and resulting in the production of products with poor appearance.

[0039] like Figures 1-3 As shown, the PPTC assembly and welding fixture plate of this utility model includes a fixture plate with at least one slot. The slot is provided with a first pin area 1, a first electrode support area 2, a second electrode support area 3 and a second pin area 4 in sequence along the length direction X. The position of the slot corresponding to the first pin area 1 and the second pin area 4 is a hollow structure. The depth of the first electrode support area 2 is less than the depth of the second electrode support area 3. This invention optimizes the fixture plate by dividing the slot into a first pin area 1, a first electrode support area 2, a second electrode support area 3, and a second pin area 4. The first pin area 1 can limit and fix the upper electrode pin. The first electrode support area 2 can provide support for the upper electrode during assembly and limit and fix the upper electrode to prevent planar displacement. The second electrode support area 3 can provide support for the lower electrode during assembly and limit and fix the lower electrode to prevent planar displacement. The second pin area 4 can limit and fix the lower electrode pin, solving the problem that the assembly fixture cannot limit and fix the pin. This invention restricts the displacement and rotation of the electrodes and plane during the assembly of PPTC products, ensuring the assembly consistency of the various components of the PPTC product.

[0040] It should be noted that the PPTC of this utility model adopts a top-to-bottom stacked structure, see [link / reference]. Figure 3The components shown on the right, from top to bottom, consist of an upper electrode, a solder paste layer, a core layer, another solder paste layer, and a lower electrode. The area of ​​the upper electrode is larger than that of the lower electrode. The upper electrode includes an upper electrode sheet and a lead, and the lower electrode includes a lower electrode sheet and a lead. The size of the first electrode sheet support area 2 is the same as the size of the upper electrode sheet, and the size of the second electrode sheet support area 3 is the same as the size of the lower electrode sheet. The edges of the first electrode sheet support area 2 and the second electrode sheet support area 3 correspond to the sidewalls of the slots, which can respectively limit the upper and lower electrode sheets. The slots corresponding to the positions of the first lead area 1 and the second lead area 4 are hollow structures, which can be understood as slots that directly penetrate the jig plate for placing the leads. The dimensions of the slot are the same as the overall dimensions of the PPTC. The sidewalls of the slot can limit the sidewalls of the upper electrode, core layer and lower electrode. During assembly, the lower electrode, core layer and upper electrode are placed in the slot from bottom to top. By combining slots of different depths, the displacement and rotation of the plane of each component of the PPTC product during assembly and welding are restricted, ensuring the assembly consistency of each component when the product becomes a finished product after welding.

[0041] In the PPTC assembly welding fixture plate according to this utility model, the depth of the first electrode support area 2 is 0.65mm-0.67mm. Specifically, the depth of the first electrode support area 2 is the thickness of the upper electrode, which is also 0.65mm-0.67mm thick, providing support for the upper electrode during assembly.

[0042] In the PPTC assembly welding fixture plate according to this utility model, the depth of the second electrode support area 3 is 1.5mm-1.84mm. Specifically, the depth of the second electrode support area 3 is the sum of the thickness of the lower electrode, the thickness of the core layer, and the thickness of the upper electrode. The thickness of the lower electrode is 0.65mm-0.67mm, the thickness of the core layer is 0.20-0.50mm, and the thickness of the upper electrode is 0.65mm-0.67mm. This depth restricts the planar displacement of the lower electrode and the core layer during assembly and provides support for the placement of the lower electrode.

[0043] In the PPTC assembly and welding fixture plate according to this utility model, first limiting notches 5 are provided at the corners of the first pin area 1 and the corners of the second pin area 4. The first limiting notches 5 penetrate the fixture plate along the thickness direction Z. Specifically, two of the first limiting notches 5 are designed at the corners of the first pin area 1, that is, at the two corners of the end of the upper electrode sheet, and the openings of the first limiting notches 5 face the two corners of the lower electrode sheet; the other two first limiting notches 5 are designed at the corners of the second pin area 4, that is, at the two corners of the end of the lower electrode sheet, to restrict the planar displacement of the electrodes during assembly.

[0044] In the PPTC assembly and welding fixture plate according to this utility model, the first electrode support area 2 is provided with two symmetrical first support blocks 21. The first support blocks 21 extend from the side wall of the slot along the width direction Y, and the top surfaces of the two first support blocks 21 are used to support the bottom surface of the first electrode sheet. Specifically, the top surfaces of the two first support blocks 21 are in direct contact with the bottom surface of the first electrode sheet, serving to support the bottom surface of the upper electrode sheet and providing support for the placement of the upper electrode sheet.

[0045] In the PPTC assembly and welding fixture plate according to this utility model, two second support blocks 31 and two third support blocks 32 are arranged in parallel in the second electrode support area 3. The second support blocks 31 extend from the side wall of the slot along the width direction Y, and the third support blocks 32 extend from the side of the first support block 21 along the length direction X. The top surfaces of the two second support blocks 31 and the two third support blocks 32 are used to support the bottom surface of the second electrode sheet. Specifically, the top surfaces of the two second support blocks 31 and the two third support blocks 32 are in contact with the bottom surface of the second electrode sheet, thus supporting the bottom surface of the lower electrode sheet and providing support for the placement of the lower electrode.

[0046] In the PPTC assembly welding fixture plate according to the present invention, the first support block 21 and the third support block 32 are arranged in a stepped manner. The height of the first support block 21 is greater than the height of the third support block 32, which helps to improve the stability of the third support block 32 and at the same time improve the overall mechanical strength of the slot. A second limiting notch 6 is provided at the connection between the first support block 21 and the third support block 32. The second limiting notch 6 is used to limit the position of the second electrode sheet. The two second limiting notches 6 are designed corresponding to the corners of the second pin area 4, that is, the two corners of the end of the lower electrode sheet. Together with the two first limiting notches 5 at the corners of the second pin area 4, the planar displacement of the four corners of the lower electrode is limited during assembly.

[0047] The working principle of this utility model is as follows:

[0048] This invention optimizes the fixture plate by dividing the slot into a first pin area 1, a first electrode support area 2, a second electrode support area 3, and a second pin area 4. The first pin area 1 can limit and fix the upper electrode pin. The first electrode support area 2 can provide support for the upper electrode during assembly and limit and fix the upper electrode to prevent planar displacement. The second electrode support area 3 can provide support for the lower electrode during assembly and limit and fix the lower electrode to prevent planar displacement. The second pin area 4 can limit and fix the lower electrode pin, solving the problem that the assembly fixture cannot limit and fix the pin. This invention restricts the displacement and rotation of the electrodes and plane during the assembly of PPTC products, ensuring the assembly consistency of the various components of the PPTC product.

[0049] Example 2

[0050] Unlike Embodiment 1, the first limiting notch 5 in this embodiment is preferably fan-shaped, and the second limiting notch 6 is preferably semi-circular, but can also be other shapes, which are not limited here. The jig plate is provided with multiple slots, and the multiple slots are evenly spaced on the jig plate. That is, the number of slots on the jig plate can be customized, and multiple PPTC products can be assembled and welded at one time.

[0051] The other structures are the same as in Embodiment 1, and will not be described again here.

[0052] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above, and any obvious improvements, substitutions, or modifications made by those skilled in the art based on this utility model are within the protection scope of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A PPTC assembly and welding fixture plate, characterized in that, Includes a jig plate, the jig plate is provided with at least one slot, the slot is provided with a first pin area (1), a first electrode sheet support area (2), a second electrode sheet support area (3) and a second pin area (4) in sequence along the length direction; The slots corresponding to the positions of the first pin area (1) and the second pin area (4) are hollow structures, and the depth of the first electrode support area (2) is less than the depth of the second electrode support area (3).

2. The PPTC assembly and welding fixture plate as described in claim 1, characterized in that: The depth of the first electrode support area (2) is 0.65mm-0.67mm.

3. The PPTC assembly and welding fixture plate as described in claim 1, characterized in that: The depth of the second electrode support area (3) is 1.5mm-1.84mm.

4. The PPTC assembly and welding fixture plate as described in claim 1, characterized in that: The corners of the first pin area (1) and the corners of the second pin area (4) are provided with first limiting notches (5), and the first limiting notches (5) penetrate the fixture plate along the thickness direction.

5. A PPTC assembly and welding fixture plate as described in claim 4, characterized in that: The first electrode support area (2) is provided with two symmetrical first support blocks (21). The first support blocks (21) extend from the side wall of the slot along the width direction, and the top surfaces of the two first support blocks (21) are used to support the bottom surface of the first electrode sheet.

6. A PPTC assembly welding fixture plate as described in claim 5, characterized in that: The second electrode support area (3) is provided with two second support blocks (31) and two third support blocks (32) in parallel. The second support block (31) extends from the side wall of the slot along the width direction, and the third support block (32) extends from the side of the first support block (21) along the length direction. The top surfaces of the two second support blocks (31) and the two third support blocks (32) are used to support the bottom surface of the second electrode sheet.

7. A PPTC assembly welding fixture plate as described in claim 6, characterized in that: The first support block (21) and the third support block (32) are arranged in a stepped manner, and the height of the first support block (21) is greater than the height of the third support block (32).

8. A PPTC assembly welding fixture plate as described in claim 6, characterized in that: A second limiting notch (6) is provided at the connection between the first support block (21) and the third support block (32), and the second limiting notch (6) is used to limit the position of the second electrode sheet.

9. A PPTC assembly and welding fixture plate as described in claim 8, characterized in that: The first limiting notch (5) is fan-shaped, and the second limiting notch (6) is semi-circular.

10. A PPTC assembly welding fixture plate as described in claim 1, characterized in that: The fixture plate is provided with a plurality of slots, which are evenly spaced on the fixture plate.

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