Patch fuse test fixture

Abstract

This application provides a surface mount fuse testing fixture, belonging to the field of fuse testing technology. Addressing the problems of low testing efficiency and poor accuracy of surface mount fuses, this application provides a surface mount fuse testing fixture, including a substrate and multiple rows of test lines disposed on the substrate. The test lines include a first fixing plate, a product positioning plate, and a second fixing plate. The first fixing plate is provided with multiple spring pins; the product positioning plate is provided with multiple positioning slots; and the second fixing plate is provided with multiple fixed pins. Furthermore, the spring pins, positioning slots, and fixed pins are correspondingly arranged, with both ends of the positioning slots being through-holes, and the slot height adapting to the height of the spring pins and fixed pins, so that the two ends of the surface mount fuse located in the positioning slot can contact the corresponding spring pins and fixed pins. Multiple spring pins and multiple fixed pins located on the same test line are connected in series by wires. This application, through the arrangement of spring pins, positioning slots, and fixed pins, ensures that the placement and contact point positions of the surface mount fuses are the same in multiple tests, and the placement position of the surface mount fuses does not need to be adjusted, thereby improving testing accuracy and efficiency.

Description

Technical Field

[0001] This application relates to the field of fuse testing technology, and more particularly to a test fixture for surface mount fuses. Background Technology

[0002] Surface mount fuses are mainly used in aerospace, defense, and electronic communications fields. They have very high requirements for product performance and appearance, and each fuse needs to be tested for changes in electrical performance at high temperatures to eliminate defective products.

[0003] like Figure 1 As shown, the existing test fixture is made of several copper sheets 1 and copper-clad laminates 2 arranged in an array and welded together. The surface mount fuses 30 are placed one by one between the copper sheets 1 and the copper-clad laminates 2 by manual operation, which is inconvenient for personnel and has low work efficiency. At the same time, the limited space leads to differences in visual angles, which means that the placement of multiple surface mount fuses and contact points are not on the same horizontal line. This increases the installation time, and the surface mount fuses and contact points cannot be placed in the same position. The accuracy of the copper sheets 1 at multiple points will have some deviation, which will result in differences in the effective measurement height and pressure. The measurement data is unstable, and contact resistance is easy to be generated. The product testing is inaccurate and prone to omission or over-testing. Utility Model Content

[0004] The purpose of this application is to address the problems of low testing efficiency and poor accuracy of surface mount fuses in existing technologies. Therefore, this application provides a surface mount fuse testing fixture. Through the arrangement of spring-loaded pins, positioning slots, and fixing pins, the placement and contact point positions of the surface mount fuses are identical across multiple tests, and the placement position of the surface mount fuses does not require adjustment, thereby improving testing accuracy and efficiency.

[0005] This application provides a surface mount fuse testing fixture, including a substrate and multiple rows of test lines disposed on the substrate. The test lines include a first fixing plate, a product positioning plate and a second fixing plate arranged sequentially along a first direction.

[0006] The first fixing plate is provided with a plurality of spring pins sequentially along a second direction perpendicular to the first direction; the product positioning plate is provided with a plurality of positioning grooves for accommodating surface mount fuses sequentially along the second direction; the second fixing plate is provided with a plurality of fixing pins sequentially along the second direction; and...

[0007] The spring pin, the positioning groove, and the fixed pin are respectively provided. The two ends of the positioning groove are through, and the opening height of the positioning groove is adapted to the height of the spring pin and the fixed pin, so that the two ends of the patch fuse located in the positioning groove can contact the corresponding spring pin and the fixed pin.

[0008] The plurality of spring pins and the plurality of fixed pins located on the same test line are connected in series by wires.

[0009] By adopting the above technical solution, the spring-loaded pin, positioning groove, and fixing pin are correspondingly set, and the positioning groove positions the surface mount fuse. This ensures that the placement and contact point position of the surface mount fuse are the same in multiple tests, and the surface mount fuse can be placed directly without manual adjustment, thereby improving test accuracy and efficiency. At the same time, the spring-loaded pin is easy to operate, and its elasticity can easily fix the surface mount fuse in the test position, further improving the ease of installation of the surface mount fuse and increasing test efficiency.

[0010] In some embodiments, the depth of the positioning groove is adapted to half the thickness of the patch fuse; and the highest point of the correspondingly provided positioning groove is on the same straight line as the center point of the conductive end of the spring pin and the fixed pin.

[0011] By adopting the above technical solution, the contact points at both ends of the surface mount fuse are located at its center point, ensuring the contact area, reducing the contact resistance, and further improving the accuracy of the test.

[0012] In some embodiments, the spring pin extends into the positioning groove in a free state.

[0013] In some embodiments, the substrate is provided with a plurality of ventilation openings, which are respectively located on both sides of the test line along its length.

[0014] In some embodiments, the bottom of the substrate is provided with lifting feet.

[0015] In some embodiments, a positive terminal block and a negative terminal block are provided on one side of the substrate, and the multiple rows of test wires are connected in series in sequence, with the two ends of the series wires connected to the positive terminal block and the negative terminal block respectively.

[0016] In some embodiments, the plurality of spring pins are evenly spaced on the first fixing plate; the plurality of positioning slots are evenly spaced on the product positioning plate; and the plurality of fixing pins are evenly spaced on the second fixing plate.

[0017] In some embodiments, the substrate, the first fixing plate, the product positioning plate, and the second fixing plate are all made of bakelite insulating material and have a temperature resistance greater than 150°C.

[0018] Other features and corresponding beneficial effects of this application will be described in the latter part of the specification, and it should be understood that at least some of the beneficial effects will become obvious from the description in this application. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an existing surface mount fuse testing fixture;

[0020] Figure 2 A diagram illustrating the usage state of the surface mount fuse installed in this application;

[0021] Figure 3 This is a schematic diagram of the substrate structure in this application;

[0022] Figure 4 This is a partial structural diagram of the test line in this application;

[0023] Figure 5 This is a partial front view schematic diagram of the product positioning plate in this application;

[0024] Figure 6 This is a partial side view of the product positioning plate in this application.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Copper sheet; 2. Copper-clad laminate;

[0027] 10. Substrate; 11. Vent; 12. Connecting hole; 13. Positive terminal block; 14. Negative terminal block; 20. Test lead; 30. Surface mount fuse;

[0028] 21. First fixing plate; 211. Spring ejector pin;

[0029] 22. Product positioning plate; 221. Positioning groove;

[0030] 23. Second fixing plate; 231. Fixing pin;

[0031] 24. Wire. Detailed Implementation

[0032] The following specific embodiments illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Although the description of this application is presented in conjunction with preferred embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of this application. To provide a thorough understanding of this application, many specific details will be included in the following description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0033] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this application and for simplification, 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 application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more. Unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] Please see Figure 2-6 , Figure 2 A diagram illustrating the usage state of the surface mount fuse installed in this application; Figure 3 This is a schematic diagram of the structure of the substrate 10 in this application; Figure 4 This is a partial structural schematic diagram of the test line 20 in this application; Figure 5 This is a partial front view schematic diagram of the product positioning plate 22 in this application; Figure 6 This is a partial side view of the product positioning plate 22 in this application.

[0036] This application provides a test fixture for surface mount fuses 30, including a substrate 10 and multiple rows of test lines 20 disposed on the substrate 10, thereby enabling batch testing of surface mount fuses 30.

[0037] The test line 20 includes a first fixing plate 21, a product positioning plate 22, and a second fixing plate 23 arranged sequentially along a first direction. The first fixing plate 21 has multiple spring-loaded pins 211 arranged sequentially along a second direction perpendicular to the first direction. These spring-loaded pins 211, also known as spring probes, can extend or retract at one end by external force, thus providing electrical conductivity. The product positioning plate 22 has multiple positioning slots 221 arranged sequentially along the second direction for accommodating the surface mount fuse 30. The second fixing plate 23 has multiple fixing pins 231 arranged sequentially along the second direction. These fixing pins 231, also known as probes, are non-extendable and only provide electrical conductivity. Preferably, the substrate 10 is a rectangular plate, with the first direction being the width direction of the substrate 10 and the second direction being the length direction of the substrate 10.

[0038] The spring pin 211, positioning groove 221, and fixed pin 231 are correspondingly arranged to form a test position. There are multiple test positions in the second direction. The two ends of the positioning groove 221 are connected, and the opening height of the positioning groove 221 is adapted to the height of the spring pin 211 and the fixed pin 231. This allows the two ends of the surface mount fuse 30 located in the positioning groove 221 to contact the corresponding spring pin 211 and the fixed pin 231. In other words, the placement and contact point position of the surface mount fuse 30 are the same in multiple tests, and the surface mount fuse 30 can be placed directly without manual adjustment, thereby improving test accuracy and efficiency. At the same time, the spring pin 211 is easy to operate, and the elasticity of the spring pin 211 can easily fix the surface mount fuse 30 in the test position, further improving the ease of installation of the surface mount fuse 30 and improving test efficiency.

[0039] It should be noted that, in addition to testing each of the multiple surface mount fuses 30 in the fixture individually (i.e., using a multimeter or a dedicated resistance tester to connect the spring pin 211 and the fixed pin 231 of each test position to test the surface mount fuse 30 at that test position), it is also necessary to perform an overall test on all the surface mount fuses 30.

[0040] Therefore, multiple spring pins 211 and multiple fixed pins 231 located on the same test line 20 are connected in series via wires 24, for example Figure 2 The S-shaped wiring shown facilitates the overall testing of the patch fuse 30 on the test line 20.

[0041] Furthermore, each test line 20 is connected in series via wire 24, which facilitates the overall testing of the patch fuse 30 on the fixture.

[0042] In one embodiment, the depth of the positioning groove 221 is adapted to half the thickness of the surface mount fuse 30; and the highest point of the corresponding positioning groove 221 is on the same straight line as the center point of the conductive end of the spring pin 211 and the fixed pin 231, so that the contact points at both ends of the surface mount fuse 30 are located at their center points, ensuring the contact area, reducing the contact resistance, and further improving the test accuracy.

[0043] In one embodiment, the spring pin 211 extends into the positioning groove 221 in a free state, thereby ensuring stable contact between the patch fuse 30 and the spring pin 211 and the fixed pin 231 after installation, thus ensuring test accuracy.

[0044] In one embodiment, the substrate 10 is provided with a plurality of ventilation openings 11, which are located on both sides of the test line 20 along its length, thereby improving heat dissipation and ensuring that the test is carried out stably and reliably.

[0045] Preferably, the substrate 10 is also provided with a plurality of connection holes 12 for connecting the first fixing plate 21, the product positioning plate 22, the second fixing plate 23, etc., by means of fasteners.

[0046] In one embodiment, the bottom of the substrate 10 is provided with lifting feet to lift the substrate 10, further improve heat dissipation, and provide space for the installation of components below the substrate 10.

[0047] In one embodiment, a positive terminal block 13 and a negative terminal block 14 are provided on one side of the substrate 10, and multiple rows of test lines 20 are connected in series in sequence. The two ends of the series wires 24 are respectively connected to the positive terminal block 13 and the negative terminal block, which facilitates the connection of the multimeter or special resistance tester required for testing.

[0048] In one embodiment, a plurality of spring ejector pins 211 are evenly spaced on the first fixing plate 21. A plurality of positioning slots 221 are evenly spaced on the product positioning plate 22. A plurality of fixing ejector pins 231 are evenly spaced on the second fixing plate 23.

[0049] In one embodiment, the substrate 10, the first fixing plate 21, the product positioning plate 22, and the second fixing plate 23 are all made of bakelite insulating material and have a temperature resistance greater than 150°C, thereby ensuring test safety.

[0050] Preferably, the substrate 10, the first fixing plate 21, the product positioning plate 22, and the second fixing plate 23 are processed using CNC equipment to ensure accurate dimensional positioning of each component and consistency of tolerance range.

[0051] When assembling this fixture, first connect the base plate 10 and the lifting feet with screws to form the base plate; then insert the fixing pin 231 into the second fixing plate 23 and insert the spring pin 211 into the first fixing plate 21; fix the first fixing plate 21, the product positioning plate 22, and the second fixing plate 23 onto the base plate 10 in sequence with screws. During installation, ensure that the product placement center positions of the first fixing plate 21, the product positioning plate 22, and the second fixing plate 23 are on the same parallel line; use a dedicated test lead 24 to connect each spring pin 211 and the fixing pin 231 in series by soldering. When soldering the connecting wires, pay attention to the strength of the soldering to prevent contact resistance caused by poor soldering; finally, connect the two connecting wires to the terminal block to form a circuit when installing the product.

[0052] In one application scenario, before testing, during product (i.e., surface mount fuse 30) installation, the spring pin 211 is manually pulled open to create a product installation gap. The product to be measured is placed into the positioning slot 221, and the spring pin 211 is released, allowing the spring pin 211 to hold the product in place by spring pressure, ensuring that the spring pin 211, the product, and the fixed pin 231 are aligned. Resistance is measured on the series-connected products according to testing requirements. If the series resistance is within the sum of the product resistances, it indicates good contact. Therefore, the use of the spring pin 211 reduces the occurrence of poor contact. Operationally, the spring pin 211 can be pulled with one hand, allowing one person to handle product placement and removal, reducing personnel requirements, improving product pass rate, and alleviating operator workload. Furthermore, due to its ease of operation, the number of products tested in a batch can be increased, further improving testing efficiency.

[0053] During the specific testing, a multimeter or a dedicated resistance tester is used to measure the resistance of each product in the fixture. If all the resistance values ​​are within the product's range, it indicates that each measurement is normal. Then, the resistance of the entire fixture is measured. The measured value should be the sum of the resistance values ​​of the products. If it is within the measurement range, it indicates that the fixture is normal.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A surface mount fuse testing fixture, characterized in that, It includes a substrate and multiple rows of test lines disposed on the substrate, wherein the test lines include a first fixing plate, a product positioning plate and a second fixing plate disposed sequentially along a first direction; The first fixing plate is provided with a plurality of spring pins sequentially along a second direction perpendicular to the first direction; the product positioning plate is provided with a plurality of positioning grooves for accommodating surface mount fuses sequentially along the second direction; the second fixing plate is provided with a plurality of fixing pins sequentially along the second direction; and... The spring pin, the positioning groove, and the fixed pin are respectively provided. The two ends of the positioning groove are through, and the opening height of the positioning groove is adapted to the height of the spring pin and the fixed pin, so that the two ends of the patch fuse located in the positioning groove can contact the corresponding spring pin and the fixed pin. The plurality of spring pins and the plurality of fixed pins located on the same test line are connected in series by wires.

2. The surface mount fuse testing fixture according to claim 1, characterized in that, The depth of the positioning groove is adapted to half the thickness of the patch fuse; and the highest point of the positioning groove is on the same straight line as the center point of the conductive end of the spring pin and the fixed pin.

3. The surface mount fuse testing fixture according to claim 1, characterized in that, The spring pin extends into the positioning groove in a free state.

4. The surface mount fuse testing fixture according to claim 1, characterized in that, The substrate is provided with multiple ventilation openings, which are located on both sides of the test line along its length.

5. The surface mount fuse testing fixture according to claim 1, characterized in that, The substrate is provided with lifting feet at the bottom.

6. The surface mount fuse testing fixture according to claim 1, characterized in that, A positive terminal block and a negative terminal block are provided on one side of the substrate. The multiple rows of test wires are connected in series in sequence, and the two ends of the series wires are respectively connected to the positive terminal block and the negative terminal block.

7. The surface mount fuse testing fixture according to claim 1, characterized in that, The plurality of spring pins are evenly spaced on the first fixing plate; the plurality of positioning slots are evenly spaced on the product positioning plate; and the plurality of fixing pins are evenly spaced on the second fixing plate.

8. The surface mount fuse testing fixture according to claim 1, characterized in that, The substrate, the first fixing plate, the product positioning plate, and the second fixing plate are all made of bakelite insulating material and have a temperature resistance greater than 150°C.

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