Tool for testing oil-immersed thermal resistance of axial lead high-voltage diode

Abstract

The utility model relates to the technical field of diode testing, in particular to an axial lead high-voltage diode oil-immersed thermal resistance testing tool which comprises a sealing shell, a tester body is fixedly installed on the right side of the sealing shell, and clamping positioning mechanisms are installed on the front side and the rear side of an inner cavity of the sealing shell. A lower die is arranged at the bottom of an inner cavity of the sealing shell, an upper die is installed on the top of the lower die, and an axial diode is placed between the lower die and the upper die. Through the arrangement of the upper die, the lower die and the placing groove, the axial diode pin positioning and clamping device has the advantage of die clamping, and the stability of subsequent axial diode pin positioning and clamping can be guaranteed; by arranging the clamping and positioning mechanism, the device has the advantage of convenient clamping, can enable the two elastic power connection sheets to stably clamp the axial diode pin, guarantees the power connection stability, is rapid and convenient in overall operation, does not need manual calibration and alignment, and is higher in overall test efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of diode testing, in particular to an oil-immersed thermal resistance testing tool for an axial lead high-voltage diode. Background Art

[0002] As a semiconductor device, the measurement of thermal resistance of the diode is one of the important performance indicators. In the thermal resistance test of semiconductor devices, considering their working environment and heat dissipation requirements, a method similar to oil immersion will be used for thermal resistance testing to simulate the heat dissipation effect under actual working conditions, so that the thermal resistance test tooling will be used for detection and processing.

[0003] The basic thermal resistance test tooling cannot adapt well to the positioning requirements of diodes of different specifications, and has a small scope of application. It can also use mobile clamping to position diodes of different lengths. However, due to the different diameters of diodes and the thickness of pins, the basic thermal resistance test device cannot perform stable positioning, and unstable contact breaks are prone to occur during the test, which has certain limitations. In order to solve the above technical problems, we have designed an axial lead high-voltage diode oil-immersed thermal resistance test tooling. Utility Model Content

[0004] The purpose of the utility model is to provide an axial lead high-voltage diode oil-immersed thermal resistance test tooling, which has the advantage of good adaptation and solves the problem that the basic thermal resistance test tooling cannot adapt well to the positioning requirements of diodes of different specifications and has a small scope of application, or adopts a mobile clamping form to position diodes of different lengths, but due to the different diameters of the diodes and the different thicknesses of the pins, stable positioning cannot be performed, and unstable contact breaks are prone to occur during the test process.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an axial lead high-voltage diode oil-immersed thermal resistance test tool, comprising a sealing shell, a tester body is fixedly installed on the right side of the sealing shell, clamping and positioning mechanisms are installed on the front and rear sides of the inner cavity of the sealing shell, a lower mold is provided at the bottom of the inner cavity of the sealing shell, an upper mold is installed on the top of the lower mold, an axial diode is placed between the lower mold and the upper mold, and a sealing plate is installed on the top of the sealing shell.

[0006] Preferably, the clamping and positioning mechanism includes a servo motor, a test connector and a screw, the bottom of the servo motor is bolted to the top of the sealing plate, the test connector is penetrated and fixedly installed on the surface of the sealing shell, and the screw is located at the bottom of the inner cavity of the sealing shell.

[0007] Preferably, the output end of the servo motor is fixedly connected to a rotating rod, and the bottom of the rotating rod is fixedly connected to a hexagonal head.

[0008] Preferably, a hexagonal socket is fixedly connected to the top of the screw, the hexagonal socket is adapted to the hexagonal head, an elastic electrical connection plate is fixedly connected to the surface of the test connector and located in the inner cavity of the sealing shell, and a mounting hole for use with the test connector is opened on the surface of the sealing shell.

[0009] Preferably, a displacement plate is provided on the surface thread sleeve of the screw rod, and a pressure head is fixedly connected to the top of the displacement plate.

[0010] Preferably, a placement groove for use with the axial diode is provided at the bottom of the upper mold and the top of the lower mold, and an anti-slip spring is fixedly connected to the bottom of the sealing plate, and the bottom of the anti-slip spring contacts the top of the upper mold.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0012] 1. The utility model has the advantage of mold clamping by setting an upper mold, a lower mold and a placement groove. It can position and clamp the axial diodes of different specifications by using the upper mold and the lower mold with corresponding placement grooves. In addition, due to the mold design, when the axial diode is placed, installed and tested, the pins on the axial diode are naturally aligned with the test connector, thereby ensuring the stability of the subsequent positioning and clamping of the axial diode pins, which is more in line with actual use requirements.

[0013] 2. The utility model has the advantage of convenient clamping by setting a clamping and positioning mechanism, which can control the operation of the servo motor and drive the screw to rotate, so that the displacement plate and multiple pressure heads move up at the same time, and then the pressure heads squeeze the elastic power connection plates inward, so that the two elastic power connection plates can stably clamp the axial diode pins to ensure the stability of power connection, and the overall operation is fast and convenient, without manual calibration and alignment, and the overall testing efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a three-dimensional schematic diagram of the utility model when the structure is separated;

[0016] Figure 3 This is a bottom-up stereogram of the utility model when the structure is separated;

[0017] Figure 4 It is a three-dimensional schematic diagram of the utility model when the sealing shell and the clamping and positioning mechanism are separated;

[0018] Figure 5 For this utility model Figure 4 A is an enlarged schematic diagram.

[0019] In the figure: 1. Sealing shell; 2. Tester body; 3. Sealing plate; 4. Clamping and positioning mechanism; 401. Servo motor; 402. Test connector; 403. Elastic electrical connection plate; 404. Rotating rod; 405. Hexagonal head; 406. Hexagonal slot seat; 407. Screw; 408. Displacement plate; 409. Pressing head; 5. Mounting hole; 6. Upper mold; 7. Axial diode; 8. Lower mold; 9. Placement slot; 10. Anti-slip spring. DETAILED DESCRIPTION

[0020] See also Figure 1-Figure 5 , an axial lead high voltage diode oil-immersion thermal resistance test tool, comprising a sealing shell 1, a tester body 2 is fixedly installed on the right side of the sealing shell 1, a clamping and positioning mechanism 4 is installed on both the front and rear sides of the inner cavity of the sealing shell 1, a lower mold 8 is arranged at the bottom of the inner cavity of the sealing shell 1, an upper mold 6 is installed on the top of the lower mold 8, an axial diode 7 is placed between the lower mold 8 and the upper mold 6, and a sealing plate 3 is installed on the top of the sealing shell 1;

[0021] See also Figure 1 , Figure 4 and Figure 5 The clamping and positioning mechanism 4 includes a servo motor 401, a test connector 402 and a screw 407. The bottom of the servo motor 401 is bolted to the top of the sealing plate 3. The test connector 402 is fixedly installed on the surface of the sealing shell 1 through the test connector 402. The screw 407 is located at the bottom of the inner cavity of the sealing shell 1.

[0022] See also Figure 4 and Figure 5 , the output end of the servo motor 401 is fixedly connected to a rotating rod 404, and the bottom of the rotating rod 404 is fixedly connected to a hexagonal head 405;

[0023] See also Figure 4 and Figure 5 The top of the screw rod 407 is fixedly connected with a hexagonal socket 406, which is matched with the hexagonal head 405. The surface of the test connector 402 is fixedly connected with an elastic power connection piece 403 located in the inner cavity of the sealing shell 1. The surface of the sealing shell 1 is provided with a mounting hole 5 used in conjunction with the test connector 402.

[0024] See also Figure 4 and Figure 5 The surface of the screw rod 407 is threadedly sleeved with a displacement plate 408, and the top of the displacement plate 408 is fixedly connected with a pressing head 409;

[0025] See also Figure 2 and Figure 3The bottom of the upper mold 6 and the top of the lower mold 8 are both provided with a placement groove 9 for use with the axial diode 7, and the bottom of the sealing plate 3 is fixedly connected with an anti-slip spring 10, and the bottom of the anti-slip spring 10 is in contact with the top of the upper mold 6;

[0026] The material of the elastic contact plate 403 is beryllium copper alloy, which is an alloy with excellent mechanical, physical and chemical properties, high strength, high elasticity, durability, fatigue resistance and heat resistance, and also has high conductivity, does not generate sparks when impacted, and is easy to weld and braze;

[0027] See also Figure 2 and Figure 3 The bottom of the lower mold 8 and the bottom of the upper mold 6 are fixedly connected with a protrusion, and a groove is provided at the bottom of the inner cavity of the sealing shell 1. The groove cooperates with the protrusion on the lower mold 8, and the lower mold 8 can be conveniently and accurately moved down and installed in the sealing shell 1. The existence of the protrusion on the upper mold 6 can ensure that the upper mold 6 and the lower mold 8 are at a distance to meet the space requirements for placing the axial diode 7;

[0028] See also Figure 2 and Figure 3 , the four corners of the top of the lower mold 8 are fixedly connected with vertical rods, the top of the vertical rods penetrates to the top of the upper mold 6 and is in sliding contact with the upper mold 6;

[0029] The four corners of the top of the sealing plate 3 are all threaded with anti-drop bolts, and the bottom of the anti-drop bolts penetrates the sealing shell 1 and is threadedly connected to the sealing shell 1;

[0030] The bottom of the screw 407 is smooth, and the connection between the smooth surface of the screw 407 and the sealing shell 1, and the connection between the surface of the rotating rod 404 and the sealing plate 3 are all movably connected through the sealing bearing;

[0031] The plurality of pressing heads 409 and the plurality of elastic power connection sheets 403 are arranged in a staggered manner, and the number of elastic power connection sheets 403 located on a single test connector 402 is two;

[0032] By providing the sealing plate 3, the top of the sealing shell 1 can be sealed and covered in the installed state to prevent the insulating oil in the sealing shell 1 from leaking out. By providing the test connector 402 and the elastic electrical connection piece 403, the pins of the axial diode 7 can be clamped by the elastic electrical connection piece 403.

[0033] By setting the rotating rod 404, it can be connected with the output end of the servo motor 401 and the hexagonal head 405, so that the rotating rod 404 can be linked with the hexagonal head 405 to rotate together. By setting the hexagonal head 405 and the hexagonal slot seat 406, it can play a role of positioning linkage in the installed state, and when the rotating rod 404 rotates, the screw 407 will rotate synchronously;

[0034] By providing the screw rod 407 and the displacement plate 408, a screw transmission function can be achieved. When the screw rod 407 rotates, the displacement plate 408 can be displaced up and down. By providing the pressing head 409, the displacement plate 408 can be in contact with the elastic power contact sheet 403 when it moves up. As the pressing head 409 gradually moves up, the elastic power contact sheet 403 gradually closes inward.

[0035] By setting the mounting hole 5, the installation space requirement of the test connector 402 can be met. By setting the upper mold 6, the lower mold 8 and the placement groove 9, the axial diode 7 can be stably clamped and positioned to meet the placement requirement of the axial diode 7. By setting the anti-slip spring 10, the anti-slip spring 10 can provide elastic support force to the top of the upper mold 6 in the installed state, thereby preventing the upper mold 6 from moving up and down at will.

[0036] In actual application, the lengths of the protrusions on the upper mold 6 and the lower mold 8 of different specifications are all different. This design is for axial diodes 7 of different specifications. When the axial diode 7 is installed between the upper mold 6 and the lower mold 8, the protrusions change the heights of the upper mold 6, the axial diode 7 and the lower mold 8, so that the pins on the axial diode 7 are kept in a concentric state with the test connector 402, and the pins on the axial diode 7 are located between two adjacent elastic electrical contact sheets 403 and are aligned with the test connector 402;

[0037] In practical application, the thickness of the upper mold 6 and the lower mold 8 can be reduced, and the placement groove 9 is in a through state, and the axial diode 7 is positioned and set through the upper mold 6 and the lower mold 8. Under this design, when the axial diode 7 is positioned and clamped, the contact surface between the axial diode 7 and the insulating oil is ensured;

[0038] During the actual test, the sealing shell 1 is filled with insulating oil in advance, and the sealing plate 3 is tightly and sealed to prevent the insulating oil from leaking randomly.

[0039] When in use, all components are in the initial state. The test head on the tester body 2 is electrically connected to the test connector 402 through a wire. Axial diodes 7 of different specifications are placed between the upper mold 6 and the lower mold 8 for pre-positioning. First, a proper amount of insulating oil is poured into the sealing shell 1, and then the pre-positioned axial diode 7 is placed into the sealing shell 1 along with the upper mold 6 and the lower mold 8. The insulating oil naturally enters between the upper mold 6 and the lower mold 8 and contacts the axial diode 7. At this time, the pins of the axial diode 7 are naturally aligned with the test connector 402 and are located between the two elastic electrical contact sheets 403. Then, the lower mold 1 is pressed. The displacement sealing plate 3 is fixedly installed on the sealing shell 1, the anti-skid spring 10 elastically presses against the top of the upper mold 6, and the hexagonal head 405 is positioned in the hexagonal slot seat 406. The inspection personnel only need to control the servo motor 401 tooling to drive the screw 407 to rotate. Under the thread transmission, the displacement plate 408 and the pressing head 409 are gradually moved up, and the pressing head 409 squeezes the two elastic power connection plates 403 inward. The two elastic power connection plates 403 stably clamp the pins on the axial diode 7 to ensure the stability of power connection. There is no need to manually position, insert and connect the pins one by one, so the operation convenience is greatly improved, which is more in line with actual use needs.

[0040] To sum up: the axial lead high-voltage diode oil-immersed thermal resistance test tooling, by setting the upper mold 6, the axial diode 7, the lower mold 8 and the placement groove 9, solves the problem that the basic thermal resistance test tooling cannot adapt well to the positioning requirements of diodes of different specifications, and has a small scope of application, or adopts the form of mobile clamping to position diodes of different lengths, but due to the different diameters of the diodes and the different thicknesses of the pins, stable positioning cannot be performed, and unstable contact breaks are prone to occur during the test.

Claims

1. An oil-immersion thermal resistance test tool for an axial lead high voltage diode, comprising a sealed shell (1), characterized in that: A tester body (2) is fixedly mounted on the right side of the sealing shell (1); clamping and positioning mechanisms (4) are mounted on both the front and rear sides of the inner cavity of the sealing shell (1); a lower mold (8) is arranged at the bottom of the inner cavity of the sealing shell (1); an upper mold (6) is mounted on the top of the lower mold (8); an axial diode (7) is placed between the lower mold (8) and the upper mold (6); and a sealing plate (3) is mounted on the top of the sealing shell (1).

2. The oil-immersion thermal resistance test fixture for axial lead high voltage diodes according to claim 1, characterized in that: The clamping and positioning mechanism (4) comprises a servo motor (401), a test connector (402) and a screw (407); the bottom of the servo motor (401) is bolted to the top of the sealing plate (3); the test connector (402) is fixedly mounted on the surface of the sealing shell (1); and the screw (407) is located at the bottom of the inner cavity of the sealing shell (1).

3. The oil-immersion thermal resistance test fixture for axial lead high voltage diodes according to claim 2, characterized in that: The output end of the servo motor (401) is fixedly connected to a rotating rod (404), and the bottom of the rotating rod (404) is fixedly connected to a hexagonal head (405).

4. The oil-immersion thermal resistance test fixture for axial lead high voltage diodes according to claim 3, characterized in that: The top of the screw rod (407) is fixedly connected to a hexagonal socket (406), and the hexagonal socket (406) is matched with the hexagonal head (405). The surface of the test connector (402) and the inner cavity of the sealing shell (1) are fixedly connected to an elastic electrical connection plate (403). The surface of the sealing shell (1) is provided with a mounting hole (5) for use with the test connector (402).

5. The oil-immersion thermal resistance test fixture for axial lead high voltage diodes according to claim 4, characterized in that: A displacement plate (408) is threadedly sleeved on the surface of the screw rod (407), and a pressure head (409) is fixedly connected to the top of the displacement plate (408).

6. The oil-immersion thermal resistance test fixture for axial lead high voltage diodes according to claim 1, characterized in that: The bottom of the upper mold (6) and the top of the lower mold (8) are both provided with a placement groove (9) for use with the axial diode (7); the bottom of the sealing plate (3) is fixedly connected with an anti-slip spring (10), and the bottom of the anti-slip spring (10) is in contact with the top of the upper mold (6).

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