Alloy sampling resistance test fixture

Abstract

The utility model relates to the technical field of resistor processing, and relates to an alloy sampling resistor test fixture. According to the utility model, the welding end is arranged on the positioning groove, the connecting end is connected with equipment such as a universal meter, the positioning assembly is used for clamping and positioning a resistor on the positioning station, the resistor is welded on the positioning station formed by the positioning grooves on the two conductive blocks, input current and test voltage are set, and the resistance value is calculated by adopting a Kelvin four-wire method. According to the utility model, the load stability of the resistor can be rapidly tested, a large conductive block made of a red copper material is adopted to replace a copper foil in an existing PCB, a larger input current can be borne, the heat dissipation speed during current loading is increased, and the load stability of a resistor product under a large current is tested; alloy resistor products with the same packaging size can share the same red copper block, compared with a PCB, the PCB does not need to be replaced every time, and the testing cost is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of resistor processing, and particularly relates to an alloy sampling resistor testing jig. Background Art

[0002] The load stability test is a test item that applies a certain current to the resistor and observes the time it takes for the resistance value to stabilize and the rate of change of the resistance value. It mainly reflects the degree of change of the resistance value of the resistor under the action of current.

[0003] The load stability test process of the resistor is to solder the resistor to a PCB test board of corresponding size, then connect the PCB board to the DC ammeter and the multimeter, set the output current, read the instantaneous voltage across the resistor, calculate the initial value of the resistor, then read the voltage once every few minutes, calculate the corresponding resistance value, and finally compare the initial value of the resistor to calculate the resistance change rate under different loading times.

[0004] During the current loading process, the resistance generates heat due to the resistance's resistance to the current. According to Joule's law, the greater the current loaded, the higher the heat generated. At present, the resistance load test is connected to a 1-ounce PCB fiberglass board or a 2-ounce aluminum substrate. When the current is loaded above 100A, the resistance pin and the PCB board welding position will be heated higher and burnt black and burnt, affecting the test under higher current. If a multi-layer PCB with better heat dissipation effect is used, the unit price is too high, the PCB board cannot be reused after the test, and the resistance test of multiple package sizes is not compatible, and the test cost rises sharply. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide an alloy sampling resistor test fixture which can carry a larger input current and increase the heat dissipation speed when the current is loaded, thereby realizing the test of the load stability of the resistor product under a large current and having a lower test cost.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model to solve its technical problems is:

[0007] An alloy sampling resistor test fixture, comprising:

[0008] The conductive assembly comprises two conductive blocks, one end of each conductive block is provided with a connecting component, and the other end of each conductive block is provided with a positioning groove, and the positioning grooves on the two conductive blocks are arranged relative to each other to form a positioning position for placing a resistor;

[0009] The connection assembly comprises two connection cables, one end of each connection cable is provided with a welding end, the welding end is provided on the positioning groove, and the other end of each connection cable is provided with a connection end;

[0010] A positioning assembly, arranged on the positioning groove, and used for clamping and positioning the resistor on the positioning station;

[0011] Wherein, the connecting cable is a flexible cable, and the conductive block is made of copper material.

[0012] In one embodiment of the utility model, the connecting component includes a screw rod, a fixing hole is provided on the loading end of the conductive block, the screw rod is passed through the fixing hole, the screw rod is connected to a nut, and the screw rod and the nut are made of metal material.

[0013] In one embodiment of the present invention, the length of the conductive block is 3-10 times the length of the resistor, and the width of the conductive block is 2-5 times the width of the resistor.

[0014] In one embodiment of the utility model, the sum of the thickness of the resistor and the welding end is less than the depth of the positioning groove, so that the resistor cannot extend from the positioning groove, the welding end is welded to the bottom surface of the positioning groove, and the electrode of the resistor is welded to the welding end.

[0015] In an embodiment of the utility model, a guide groove is provided on the side of the conductive block, an insulating heat-insulating layer is provided on the guide groove, the connecting cable is arranged in the guide groove, and the positioning groove is communicated with the guide groove.

[0016] In one embodiment of the utility model, the positioning assembly includes two clamping blocks, which are made of heat-resistant rubber. The two clamping blocks are respectively arranged on the two side walls of the positioning groove. The clamping blocks are provided with clamping surfaces, and the two sides of the resistor are clamped and positioned by the two clamping blocks.

[0017] In one embodiment of the utility model, positioning holes are provided on both side walls of the positioning groove, the clamping block is inserted into the positioning hole, the length of the clamping block is greater than the depth of the positioning hole, so that the clamping block extends out of the positioning hole and abuts against the side surface of the resistor, and the positioning hole is provided in the middle of the side wall of the positioning groove.

[0018] In one embodiment of the utility model, the clamping surface includes a clamping slope, and the end of the clamping block is provided with a pressing surface connected to the resistor, the clamping slope is connected to a side surface of the pressing surface, and the area of ​​the pressing surface is smaller than the cross-sectional area of ​​the clamping block.

[0019] In one embodiment of the utility model, the positioning assembly includes a clamping block and a fixed block, both of which are made of heat-resistant rubber. The clamping block and the fixed block are respectively arranged on the two side walls of the positioning groove. The clamping block is provided with a clamping surface, and the resistor is pressed against the fixed block by the clamping block to clamp and position it.

[0020] In an embodiment of the present invention, a clamping channel is provided between the fixing block and the bottom surface of the positioning groove, and a pressing inclined surface is provided on the fixing block, and the pressing inclined surface abuts against the side surface of the resistor.

[0021] Beneficial effects of the utility model:

[0022] The welding end of the utility model is arranged on the positioning groove, the connection end is connected with the multimeter and other equipment, the positioning component clamps and positions the resistor on the positioning station, the resistor is welded on the positioning station formed by the positioning grooves on the two conductive blocks, the input current and the test voltage are set to use the Kelvin four-wire method to calculate the resistance value, the load stability test of the resistor can be quickly performed, the conductive block of a large piece of copper material is used to replace the copper foil in the existing PCB board, a larger input current can be carried, and the heat dissipation speed when the current is loaded is increased, so as to realize the load stability test of the resistor product under large current; alloy resistor products with the same package size can share the same copper block, compared with the PCB board, it is not necessary to replace the PCB board every time, and the testing cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The utility model is a schematic diagram of an alloy sampling resistor test fixture.

[0024] Figure 2 This is a schematic diagram of the positioning component of the utility model Figure 1 .

[0025] Figure 3 This is a schematic diagram of the positioning component of the utility model Figure 2 .

[0026] Explanation of the numbers in the figure: 1. Conductive block; 11. Positioning groove; 12. Positioning station; 2. Connecting component; 21. Screw; 22. Nut; 23. Fixing hole; 3. Resistor; 4. Connecting cable; 41. Connecting end; 42. Guide groove; 43. Welding end; 5. Clamping block; 51. Clamping slope; 52. Clamping surface; 53. Positioning hole; 54. Fixing block; 55. Pressing slope. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0028] Reference Figure 1-3 As shown, an alloy sampling resistor test fixture includes:

[0029] The conductive assembly comprises two conductive blocks 1, one end of each conductive block 1 is provided with a connecting component 2, and the other end of each conductive block 1 is provided with a positioning groove 11, and the positioning grooves 11 on the two conductive blocks 1 are arranged relative to each other to form a positioning station 12 for placing a resistor 3;

[0030] The connection assembly includes two connection cables 4, one end of each connection cable 4 is provided with a welding end 43, and each welding end 43 is provided on the positioning groove 11, and the other end of each connection cable 4 is provided with a connection end 41;

[0031] A positioning component, arranged on the positioning groove 11, and used for clamping and positioning the resistor 3 on the positioning station 12;

[0032] The connecting cable 4 is a flexible cable, and the conductive block 1 is made of copper.

[0033] The welding end 43 of the utility model is arranged on the positioning groove 11, and the connecting end 41 is connected to a multimeter or other equipment. The positioning component clamps and positions the resistor 3 on the positioning station 12, and the resistor 3 is welded on the positioning station 12 formed by the positioning grooves 11 on the two conductive blocks 1. The input current and the test voltage are set to use the Kelvin four-wire method to calculate the resistance value, so that the load stability test of the resistor 3 can be quickly performed. The conductive block 1 made of a large piece of copper material is used to replace the copper foil in the existing PCB board, which can carry a larger input current and increase the heat dissipation speed when the current is loaded, so as to realize the load stability test of the resistor 3 product under a large current; the alloy resistor 3 products with the same package size can share the same copper block. Compared with the PCB board, it is not necessary to replace the PCB board every time, and the testing cost is lower.

[0034] In one embodiment of the utility model, the connecting component 2 includes a screw 21, a fixing hole 23 is provided on the loading end of the conductive block 1, the screw 21 is passed through the fixing hole 23, the screw 21 is connected to the nut 22, and the screw 21 and the nut 22 are made of metal material.

[0035] In one embodiment of the utility model, the length of the conductive block 1 is 3-10 times the length of the resistor 3, and the width of the conductive block 1 is 2-5 times the width of the resistor 3; this makes the conductive block 1 have a larger volume, can carry a larger input current, and increase the heat dissipation speed when the current is loaded, thereby realizing the test of the load stability of the resistor 3 product under large current.

[0036] In one embodiment of the utility model, the sum of the thicknesses of the resistor 3 and the welding end 43 is less than the depth of the positioning groove 11, so that the resistor 3 cannot extend from the positioning groove 11, and the welding end 43 is welded to the bottom surface of the positioning groove 11, and the electrode of the resistor 3 is welded to the welding end 43 together.

[0037] Specifically, the sum of the thickness of the resistor 3 and the welding end 43 is less than the depth of the positioning groove 11, so that the resistor 3 cannot extend from the positioning groove 11, effectively preventing the resistor 3 from being desoldered due to contact with foreign objects, thereby improving the detection effect.

[0038] In an embodiment of the utility model, a guide groove 42 is provided on the side of the conductive block 1 , an insulating heat-insulating layer is provided on the guide groove 42 , the connecting cable 4 is arranged in the guide groove 42 , and the positioning groove 11 is connected to the guide groove 42 .

[0039] Specifically, by moving the conductive blocks 1 closer to or farther away from each other, the size of the positioning station 12 can be changed so that it can adapt to various types of resistor 3 products. The connecting cable 4 is arranged in the guide groove 42, which can avoid the connection between two connecting cables 4 affecting the test results and ensure the stability of the test. The insulating and heat-insulating layer arranged on the guide groove 42 can also avoid the heating of the conductive block 1 affecting the connecting cable 4 and improve the service life of the connecting cable 4.

[0040] In one embodiment of the utility model, the positioning assembly includes two clamping blocks 5, which are made of heat-resistant rubber. The two clamping blocks 5 are respectively arranged on the two side walls of the positioning groove 11, and the clamping blocks 5 are provided with clamping surfaces 52, and the two sides of the resistor 3 are clamped and positioned by the two clamping blocks 5.

[0041] Specifically, a clamping surface 52 is provided on the clamping block 5, and the two sides of the resistor 3 are clamped and positioned by the two clamping blocks 5, and the resistor 3 is placed in the positioning groove 11. The pins of the resistor 3 are soldered to the welding ends 43 of the flexible cables on both sides with solder paste, which can ensure the position accuracy of the resistor 3 when connecting the cable 4, ensure the welding position, and improve the test accuracy.

[0042] In one embodiment of the utility model, positioning holes 53 are provided on both side walls of the positioning groove 11, and the clamping block 5 is inserted into the positioning hole 53. The length of the clamping block 5 is greater than the depth of the positioning hole 53, so that the clamping block 5 extends out of the positioning hole 53 and abuts against the side of the resistor 3, and the positioning hole 53 is provided in the middle of the side wall of the positioning groove 11.

[0043] Specifically, the length of the clamp 5 is greater than the depth of the positioning hole 53, so that the clamp 5 extends out of the positioning hole 53 and abuts against the side of the resistor 3. The clamp 5 slightly extends out of the positioning hole 53 to form a positioning protrusion to perform a certain positioning effect on the resistor 3, so that it can be welded more stably and the detection accuracy is improved.

[0044] In one embodiment of the utility model, the clamping surface 52 includes a clamping inclined surface 51, and the end of the clamping block 5 is provided with a pressing surface connected to the resistor 3, the clamping inclined surface 51 is connected to a side surface of the pressing surface, and the area of ​​the pressing surface is smaller than the cross-sectional area of ​​the clamping block 5.

[0045] Specifically, the area of ​​the abutting surface is smaller than the cross-sectional area of ​​the clamp block 5, so that a boss structure is formed at the abutting surface of the clamp block 5. The resistor 3 can be guided by the clamping bevel 51, so that the resistor 3 can move more quickly and abut against the abutting surface. After the clamping bevel 51 guides, the two clamping surfaces 52 clamp and position the two sides of the resistor 3, thereby ensuring the welding accuracy of the resistor 3 and providing test accuracy.

[0046] In one embodiment of the utility model, the positioning assembly includes a clamping block 5 and a fixing block 54, both of which are made of heat-resistant rubber. The clamping block 5 and the fixing block 54 are respectively arranged on the two side walls of the positioning groove 11, and a clamping surface 52 is provided on the clamping block 5. The resistor 3 is pressed against the fixing block 54 by the clamping block 5 to clamp and position it.

[0047] Specifically, when positioning the resistor 3, solder paste is coated on the welding end 43, one end of the resistor 3 is inserted into the clamping channel, and the other end is guided by the clamping slope 51 to the rear clamping surface 52 to press the other side of the resistor 3, so that the resistor 3 is pressed against the fixed block 54 to clamp and position it, and a hot air gun or other welding equipment is used to weld the resistor 3 to the welding end 43 to ensure the welding accuracy of the resistor 3 and provide test accuracy.

[0048] In an embodiment of the present invention, a clamping channel is provided between the fixing block 54 and the bottom surface of the positioning groove 11 , and a pressing inclined surface 55 is provided on the fixing block 54 , and the pressing inclined surface 55 abuts against the side surface of the resistor 3 .

[0049] Specifically, a pressing slope 55 is provided on the fixed block 54, so that the side of the resistor 3 can directly abut against the pressing slope 55, so that it can be adapted to various types of resistor 3 products. The pressing slope 55 can provide a certain pressing force for the resistor 3, which can better position the resistor 3 and improve the welding effect of the resistor 3.

[0050] Usage process

[0051] The conductive block 1 is fixed on the test equipment by means of screws 21 and nuts 22, the resistor 3 is placed in the positioning groove 11, the pins of the resistor 3 are soldered to the welding ends 43 of the flexible cables on both sides with solder paste, the position of the resistor 3 is clamped and positioned by the positioning assembly, the connecting ends 41 of the two connecting cables 4 are connected to the multimeter, the conductive block 1 is connected to the DC power supply, the DC power supply is fixed with screws 21 and nuts 22, the input current and test voltage are set, and the resistance value is calculated using the Kelvin four-wire method.

[0052] Using a large copper conductive block 1 to replace the copper foil in the PCB board can carry a larger input current and increase the heat dissipation speed when the current is loaded, so as to realize the load stability test of the resistor 3 product under large current;

[0053] Alloy resistor 3 products with the same package size can share the same copper block. Compared with PCB boards, there is no need to replace the PCB boards every time, and the testing cost is lower.

[0054] When positioning the resistor 3, apply solder paste on the welding end 43, place the resistor 3 between the two clamping blocks 5, and clamp and position the two sides of the resistor 3 through the clamping inclined surface 51 and the two clamping surfaces 52, and weld the resistor 3 to the welding end 43 using welding equipment such as a hot air gun;

[0055] When positioning the resistor 3, solder paste is applied to the welding end 43, one end of the resistor 3 is inserted into the clamping channel, and the other end is guided by the clamping slope 51 to the rear clamping surface 52 to press the other side of the resistor 3, so that the resistor 3 is pressed against the fixing block 54 to clamp and position it, and the resistor 3 is welded to the welding end 43 using welding equipment such as a hot air gun.

[0056] The above-described embodiments are only preferred embodiments for fully illustrating the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or changes made by technicians in the technical field on the basis of the present utility model are all within the protection scope of the present utility model. The protection scope of the present utility model shall be subject to the claims.

Claims

1. An alloy sampling resistor test fixture, characterized in that: include: The conductive assembly comprises two conductive blocks, one end of each conductive block is provided with a connecting component, and the other end of each conductive block is provided with a positioning groove, and the positioning grooves on the two conductive blocks are arranged relative to each other to form a positioning position for placing a resistor; The connection assembly comprises two connection cables, one end of each connection cable is provided with a welding end, the welding end is provided on the positioning groove, and the other end of each connection cable is provided with a connection end; A positioning assembly, arranged on the positioning groove, and used for clamping and positioning the resistor on the positioning station; Wherein, the connecting cable is a flexible cable, and the conductive block is made of copper material.

2. The alloy sampling resistor test fixture as claimed in claim 1, characterized in that: The connecting component comprises a screw rod, a fixing hole is arranged on the loading end of the conductive block, the screw rod is passed through the fixing hole, the screw rod is connected with a nut, and the screw rod and the nut are made of metal materials.

3. The alloy sampling resistor test fixture as claimed in claim 1, characterized in that: The length of the conductive block is 3-10 times the length of the resistor, and the width of the conductive block is 2-5 times the width of the resistor.

4. The alloy sampling resistor test fixture as claimed in claim 1, characterized in that: The sum of the thickness of the resistor and the welding end is less than the depth of the positioning groove, so that the resistor cannot extend from the positioning groove. The welding end is welded on the bottom surface of the positioning groove, and the electrode of the resistor is welded to the welding end.

5. The alloy sampling resistor test fixture as claimed in claim 1, characterized in that: A guide groove is arranged on the side of the conductive block, an insulating heat-insulating layer is arranged on the guide groove, the connecting cable is arranged in the guide groove, and the positioning groove is communicated with the guide groove.

6. The alloy sampling resistor test fixture as claimed in claim 1, characterized in that: The positioning assembly includes two clamping blocks, which are made of heat-resistant rubber and are respectively arranged on the two side walls of the positioning groove. The clamping blocks are provided with clamping surfaces, and the two sides of the resistor are clamped and positioned by the two clamping blocks.

7. The alloy sampling resistor test fixture as claimed in claim 6, characterized in that: Positioning holes are provided on both side walls of the positioning groove, and the clamping block is inserted through the positioning hole. The length of the clamping block is greater than the depth of the positioning hole, so that the clamping block extends out of the positioning hole and abuts against the side surface of the resistor, and the positioning hole is provided in the middle of the side wall of the positioning groove.

8. The alloy sampling resistor test fixture as claimed in claim 6, characterized in that: The clamping surface includes a clamping inclined surface, and the end of the clamping block is provided with a pressing surface connected to the resistor, the clamping inclined surface is connected to a side surface of the pressing surface, and the area of ​​the pressing surface is smaller than the cross-sectional area of ​​the clamping block.

9. The alloy sampling resistor test fixture as claimed in claim 1, characterized in that: The positioning assembly includes a clamping block and a fixing block, both of which are made of heat-resistant rubber. The clamping block and the fixing block are respectively arranged on the two side walls of the positioning groove. The clamping block is provided with a clamping surface, and the resistor is pressed against the fixing block by the clamping block to clamp and position it.

10. The alloy sampling resistor test fixture as claimed in claim 9, characterized in that: A clamping channel is arranged between the fixing block and the bottom surface of the positioning groove, and a pressing inclined surface is arranged on the fixing block, and the pressing inclined surface abuts against the side surface of the resistor.

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