Optoelectronic product performance testing equipment

Abstract

The invention relates to the technical field of optoelectronic products, in particular to optoelectronic product performance testing equipment, which has a simple structure and reduces the workload of test personnel for resetting anode leads and cathode leads of diodes when testing diodes, thereby reducing labor intensity and improving testing efficiency. The equipment comprises: a test bench, a groove for placing a diode housing is provided on the test bench, and resetting mechanisms are slidably arranged on both sides of the test bench; a centering mechanism for centering the diode is arranged at the bottom end of the test bench through an adjusting mechanism; a clamping mechanism is arranged in the middle of the test bench, a cylinder is arranged at both ends of the test bench, and a test piece is fixed at the output end of the cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of optoelectronic products, and in particular to optoelectronic product performance detection equipment. Background Art

[0002] Photoelectric products refer to products that convert light into electricity, electricity into light, or multiple photoelectric conversions through electrical properties. They are widely used in various fields. For example, diodes are electronic devices made of semiconductor materials (silicon, selenium, germanium, etc.). Diodes have two electrodes, the positive electrode, also called the anode; the negative electrode, also called the cathode. When a forward voltage is applied between the two electrodes of the diode, the diode is turned on. When a reverse voltage is applied, the diode is cut off.

[0003] After the diodes are recycled, they need to be tested to see if they can continue to be used. In the prior art, since these diodes are used, their pins are often bent and deformed. Before testing, the positive and negative leads of the diodes need to be manually bent and reset before testing. This method increases the labor intensity of the testers and makes the test efficiency low. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a photoelectric product performance detection device with a simple structure. When testing a diode, it reduces the workload of the tester in resetting the positive lead and the negative lead of the diode, reduces labor intensity, and improves test efficiency.

[0005] The photoelectric product performance testing device of the present invention comprises: a test bench, a groove for placing a diode housing is provided on the test bench, and reset mechanisms are slidably provided on both sides of the test bench; a centering mechanism for centering the diode is provided at the bottom end of the test bench through an adjustment mechanism;

[0006] A clamping mechanism is arranged in the middle of the test bench, and a cylinder 1 is arranged at both ends of the test bench, and a test piece is fixed at the output end of the cylinder 1.

[0007] The present invention is further improved, the reset mechanism comprises a fixed plate, the fixed plate is provided with a through hole 1 and a through hole 2 which are connected, the through hole 1 and the through hole 2 form a right angle, and also comprises a moving shaft 1 passing through the through hole 1, and the moving plate is fixed at one end of the moving shaft 1;

[0008] Connecting shafts are rotatably mounted on both sides of the moving plate, a clamping plate is fixed to one end of the connecting shaft, one end of an extension rod is fixed to the other end, and a guide shaft is fixed to the other end of the extension rod;

[0009] It also includes a transverse plate fixedly connected to the fixed plate, the transverse plate is provided with two symmetrical guide holes, the guide holes include through hole three, through hole four and through hole five, the guide shaft passes through the guide holes, and through hole three and through hole five are both inclined.

[0010] The present invention is further improved, the reset mechanism also includes a rotating shaft rotatably mounted on the fixed plate, the rotating shaft is fixed with a driving arm 1, the driving arm 1 is slidably connected to the other end of the moving shaft 1, and a motor is fixed to the end of the rotating shaft.

[0011] The present invention is further improved, the reset mechanism also includes a track 1 fixedly connected to the fixed plate, the track 1 has a slider 1 sliding, the slider 1 is fixed with a track 2, the track 2 has a slider 2 sliding, and the movable shaft 1 is fixedly connected to the slider 2.

[0012] The present invention is further improved, the adjustment mechanism includes positive and negative screw rods rotatably connected to the test bench, both sides of the positive and negative screw rods are threadedly connected with screw sleeves, and the screw sleeves are slidably connected to the test bench;

[0013] The centering mechanism includes a base plate fixedly connected to the screw sleeve, the base plate is provided with a through hole 6 and a through hole 7 connected to each other, the through hole 6 and the through hole 7 form a right angle, and also includes a moving shaft 2 passing through the through hole 6, and a lever is fixed at one end of the moving shaft 2;

[0014] The base plate is rotatably mounted with a shaft tube, the shaft tube is fixed with a second driving arm, and the second driving arm is slidably connected with the other end of the second moving shaft.

[0015] The present invention is further improved, the centering mechanism also includes a track three fixedly connected to the base plate, the track three slides with a slider three, the slider three is fixed with a track four, the track four slides with a slider four, and the movable shaft two is fixedly connected to the slider four.

[0016] The present invention is further improved, wherein a spiral hole is provided in the lower half of the shaft tube, the centering mechanism further comprises a power mechanism connected to the test bench, a power shaft is fixed to the output end of the power mechanism, and two ends of the power shaft respectively pass through the two spiral holes;

[0017] A notch is provided at the shaft tube on the opposite side of the spiral hole.

[0018] The present invention is further improved in that the clamping mechanism comprises a bracket fixed at the middle of the test bench, the bracket is fixed with the second cylinder, and the output end of the second cylinder is fixed with a pressing block.

[0019] The present invention is further improved in that support frames are fixed at both ends of the test bench, and the cylinder 1 is slidably connected to the support frame.

[0020] The present invention is further improved in that the fixing plate is slidably connected to the test bench.

[0021] Compared with the prior art, the present invention has the following beneficial effects: the present invention has a simple structure, and during testing, the diode with irregular anode leads and cathode leads is automatically placed flat in the groove, and then the diode is centered, and then the anode leads and cathode leads are automatically straightened to facilitate the contact between the test piece and the anode leads and cathode leads, which greatly reduces the labor intensity of the test personnel, improves the test efficiency, and can also adapt to diodes of more sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 yes Figure 1 A partial enlarged view of the middle A part;

[0024] Figure 3 yes Figure 1 Stereoscopic image from frontal perspective;

[0025] Figure 4 yes Figure 3 A partial enlarged view of the middle B part;

[0026] Figure 5 yes Figure 1 Stereoscopic image from rear side view;

[0027] Figure 6 yes Figure 5 A partial enlarged view of the middle C part;

[0028] Figure 7 It is a schematic diagram of the structure of the regulating mechanism and the centering mechanism;

[0029] Figure 8 yes Figure 7 Bottom view of

[0030] Fig. 9 It is an exploded view of the reset mechanism;

[0031] Markings in the attached figure: 1, test bench; 2, cylinder 1; 3, test piece; 4, fixed plate; 5, through hole 1; 6, through hole 2; 7, moving shaft 1; 8, moving plate; 9, connecting shaft; 10, clamping plate; 11, extension rod; 12, guide shaft; 13, cross plate; 14, through hole 3; 15, through hole 4; 16, through hole 5; 17, rotating shaft; 18, driving arm 1; 19, motor; 20, track 1; 21, slider 1; 22, track 2; 23. Slider 2; 24. Forward and reverse screw rods; 25. Screw sleeve; 26. Optical axis; 27. Base plate; 28. Through hole 6; 29. ​​Through hole 7; 30. Moving axis 2; 31. Push rod; 32. Shaft tube; 33. Driving arm 2; 34. Track 3; 35. Slider 3; 36. Track 4; 37. Slider 4; 38. Spiral hole; 39. Power mechanism; 40. Power shaft; 41. Cylinder 2; 42. Pressure block; 43. Support frame. Implementation

[0032] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] like Figures 1 to 9 As shown, the optoelectronic product performance testing device of the present invention comprises: a test bench 1, more specifically, the test bench 1 is a box with a hollow interior, a groove for placing a diode housing is provided on the top of the test bench 1, and the cross-section of the groove is in an arc shape, the purpose is to better fit with the diode housing and play a centering role;

[0035] Both sides of the test bench 1 are slidably provided with reset mechanisms, and two sets of reset mechanisms are symmetrically arranged to reset the positive electrode lead and the negative electrode lead respectively;

[0036] The bottom end of the test bench 1 is provided with a centering mechanism for centering the diode through an adjustment mechanism;

[0037] A clamping mechanism is provided in the middle of the test bench 1, and cylinders 2 are provided at both ends of the test bench 1. A test piece 3 is fixed at the output end of the cylinder 2. There are two test pieces 3, namely, a positive electrode test piece 3 and a negative electrode test piece 3;

[0038] In this embodiment, when conducting a test, first manually place the diode to be tested into the groove, with the diode placed in the same direction as the groove. Then operate the pressing mechanism to press the diode and then reset it, in order to place the diode flatly and horizontally in the groove. Then operate the centering mechanism to center the diode and keep it in the centered state. Then operate the reset mechanism to straighten the positive lead and the negative lead of the diode. Then operate the cylinder 1 2 to lower the two test pieces 3 to contact the positive lead and the negative lead for testing. After the test is completed, remove the diode to be tested.

[0039] The present invention is further improved as follows: Figure 3-Figure 6 as well as Fig. 9 As shown, the reset mechanism includes a fixed plate 4, the fixed plate 4 is provided with a through hole 1 5 and a through hole 2 6 connected to each other, the through hole 1 5 and the through hole 2 6 form a right angle, and also includes a moving shaft 1 7 passing through the through hole 1 5, the moving shaft 1 7 is fixed with a bearing, the outer ring of the bearing is in contact with the inner wall of the through hole 1 5 or the through hole 2 6, and a moving plate 8 is fixed to one end of the moving shaft 1 7;

[0040] The movable plate 8 is rotatably mounted with a connecting shaft 9 on both sides through bearings. One end of the connecting shaft 9 is fixed with one end of a clamping plate 10. The clamping plate 10 is in a rectangular shape, and the other end is fixed with one end of an extension rod 11. Fig. 9 As shown, the extension rod 11 is in an inclined state, and a guide shaft 12 is fixed to the other end of the extension rod 11;

[0041] It also includes a transverse plate 13 fixedly connected to the fixing plate 4, the transverse plate 13 is provided with two symmetrical guide holes, the guide holes include a through hole 3 14, a through hole 4 15 and a through hole 5 16, the guide shaft 12 passes through the guide holes, the through hole 4 15 is parallel to the diode axis direction, the through hole 3 14 and the through hole 5 16 are both inclined, and the through hole 3 14 and the through hole 5 16 are symmetrically arranged, when the guide shaft 12 moves to different positions of the guide holes, the front and rear positions of the guide shaft 12 are different, so that the clamping plate 10, the connecting shaft 9, the extension rod 11 and the guide shaft 12 rotate around the axis of the connecting shaft 9;

[0042] The present invention is further improved as follows: Figures 1 to 6 As shown, the reset mechanism also includes a rotating shaft 17 rotatably mounted on the fixed plate 4, the rotating shaft 17 is located above the middle position of the through hole 2 6, a driving arm 18 is fixed to the rotating shaft 17, the driving arm 18 is slidably connected to the other end of the moving shaft 7, and a motor 19 is fixed to the end of the rotating shaft 17. More specifically, the driving arm 18 is provided with a long hole 1, the moving shaft 7 passes through the long hole 1, and a bearing is installed at the overlap of the moving shaft 7 and the long hole 1;

[0043] The present invention is further improved as follows: Figure 6As shown, the reset mechanism also includes a track 20 fixedly connected to the fixed plate 4, a slider 21 slides on the track 20, a track 22 is fixed on the slider 21, a slider 23 slides on the track 22, and a movable shaft 7 is fixedly connected to the slider 23;

[0044] In this embodiment, if Figure 3 As shown, after the centering mechanism centers the diode, the two motors 19 are operated to rotate the shaft 17 and the driving arm 18, and the two motors 19 turn in opposite directions. Taking the left motor 19 as an example, the motor 19 drives the shaft 17 and the driving arm 18 to rotate clockwise. Since the shaft 17 is located above the middle position of the through hole 2 6, the driving arm 18 always generates thrust on the moving shaft 7, so that the moving shaft 7 moves along the through hole 1 5 and the through hole 2 6 successively. The through hole 1 5 is vertical, so the moving shaft 1 7, the moving plate 8, the connecting shaft 9, the clamping plate 10, the extension rod 11 and the guide shaft 12 all move downward, and the relative position between the guide shaft 12 and the cross plate 13 changes, but it will not affect the front and rear position of the guide shaft 12;

[0045] Then the moving shaft 1 7 moves along the through hole 2 6. Since the two-stage lead is thin, when the moving shaft 1 7 is on the through hole 2 6, the bottom end of the clamping plate 10 contacts the top of the test bench 1, and when the clamping plate 10 just contacts the top of the test bench 1, the clamping plate 10 is on both sides of the lead. The through hole 2 6 is set horizontally, and similarly, the moving plate 8, the connecting shaft 9, the clamping plate 10, the extension rod 11 and the guide shaft 12 are driven to move horizontally, thereby pushing the guide shaft 12 to move along the through hole 3 14, the through hole 4 15 and the through hole 5 16, and along the through hole 3 14 When moving, the extension rod 11, the clamping plate 10, etc. rotate with the connecting shaft 9 as the axis, and the end of the clamping plate 10 away from the connecting shaft 9 approaches the diode, so that the lead is in the middle position. When moving along the through hole 4 15, the angle of the clamping plate 10 remains unchanged, and the remaining length of the lead is straightened. When the lead is left for a section, the motor 19 is stopped. After the test is completed, the motor 19 is turned on again to move the guide shaft 12 to the through hole 5 16, so that the end of the clamping plate 10 away from the connecting shaft 9 is opened, the lead is released, and then the diode is manually removed;

[0046] When the movable shaft 1 7 moves along the through hole 1 5 and the through hole 2 6 , since the movable shaft 1 7 is fixedly connected to the slider 2 23 and the slider 2 23 can only move along the track 2 22 and the track 1 20 , the slider 2 23 will not rotate and the movable shaft 1 7 will not rotate either.

[0047] The present invention is further improved as follows: Figures 7 and 8 As shown, the adjustment mechanism includes a positive and negative screw rod 24 rotatably connected to the test bench 1, and screw sleeves 25 are threadedly connected on both sides of the positive and negative screw rods 24. The screw sleeve 25 is slidably connected to the test bench 1, and an optical axis 26 passing through the screw sleeve 25 is fixed in the test bench 1;

[0048] The centering mechanism includes a base plate 27 fixedly connected to the screw sleeve 25, the base plate 27 is provided with a through hole 6 28 and a through hole 7 29 connected to each other, the through hole 6 28 and the through hole 7 29 form a right angle, the through hole 6 28 and the through hole 7 29 are both arranged horizontally, and also includes a moving shaft 2 30 passing through the through hole 6 28, and a lever 31 is fixed at one end of the moving shaft 2 30. More specifically, a reserved hole is provided on the top of the test bench 1 for the lever 31 to extend out;

[0049] The base plate 27 is rotatably mounted with an axle tube 32, and a driving arm 2 33 is fixed to the axle tube 32. The driving arm 2 33 is slidably connected to the other end of the moving shaft 2 30. More specifically, the driving arm 2 33 has a second long hole, and the moving shaft 2 30 passes through the second long hole, and the axle tube 32 is in the area surrounded by the sixth through hole 28 and the seventh through hole 29. When the axle tube 32 rotates, the driving arm 2 33 can generate thrust on the moving shaft 2 30, so that it moves along the sixth through hole 28 and the seventh through hole 29.

[0050] The present invention is further improved as follows: Figures 7 and 8 As shown, the centering mechanism also includes a track 34 fixedly connected to the base plate 27, a slider 35 slides on the track 34, a track 4 36 is fixed on the slider 35, a slider 4 37 slides on the track 4 36, and the movable shaft 2 30 is fixedly connected to the slider 4 37;

[0051] In this embodiment, during the movement of the second moving shaft 30 along the sixth through hole 28 and the seventh through hole 29, since the second moving shaft 30 is fixedly connected to the fourth slider 37 and the fourth slider 37 can only move along the third track 34 and the fourth track 36, the fourth slider 37 will not rotate and the second moving shaft 30 will not rotate either;

[0052] The present invention is further improved as follows: Figures 7 and 8 As shown, a spiral hole 38 is provided in the lower half of the shaft tube 32, and the centering mechanism further includes a power mechanism 39 connected to the test bench 1. The power mechanism 39 is a cylinder, and a power shaft 40 is fixed at the output end of the power mechanism 39. Both ends of the power shaft 40 pass through two spiral holes 38 respectively.

[0053] A notch is provided at the shaft tube 32 on the opposite side of the spiral hole 38;

[0054] In this embodiment, if Figures 7 and 8As shown, when the centering operation is required, the power mechanism 39 is operated to move the two power shafts 40 upward at the same time, and the two ends of the power shaft 40 pass through the two spiral holes 38 respectively, so the moving power shaft 40 causes the shaft tube 32 and the second driving arm 33 connected to the shaft tube 32 to rotate, thereby pushing the second moving shaft 30 and the lever 31 to move along the sixth through hole 28 and the seventh through hole 29 in turn. When the second moving shaft 30 moves along the sixth through hole 28, the lever 31 moves from the oblique side surface of the diode to the positive side surface of the diode. When the second moving shaft 30 moves along the seventh through hole 29, the lever 31 approaches the diode to center the diode.

[0055] Since the span of the through hole 7 29 remains unchanged, the lateral movement distance of the lever 31 remains unchanged when the rotation angle of the shaft tube 32 remains unchanged. In order to accommodate more diodes, the position of the screw sleeve 25 can be adjusted by rotating the forward and reverse screw rods 24, so that the initial positions of the substrate 27 and the lever 31 can be changed. The lateral movement distance of the lever 31 remains unchanged when the rotation angle of the shaft tube 32 remains unchanged, so the terminal position of the lever 31 can be changed to accommodate diodes of different sizes.

[0056] When the forward and reverse screw rods 24 rotate to drive the shaft tube 32 to move, the movement of the power shaft 40 is not affected due to the provision of the notch.

[0057] The present invention is further improved as follows: Figure 1 As shown, the clamping mechanism includes a bracket fixed in the middle of the test bench 1, the bracket is fixed with a cylinder 2 41, the output end of the cylinder 2 41 is fixed with a pressing block 42, and the lower surface of the pressing block 42 is arc-shaped;

[0058] In this embodiment, the lifting and lowering of the pressing block 42 is controlled by controlling the second cylinder 41 .

[0059] The present invention is further improved, the two ends of the test bench 1 are fixed with support frames 43, the cylinder 1 2 is slidably connected to the support frame 43, and screws are provided for fixing the position of the cylinder 1 2;

[0060] In this embodiment, the positions of the cylinder 1 2 and the test piece 3 relative to the support frame 43 can be adjusted to adapt to the length of the lead wire.

[0061] The present invention is further improved, the fixing plate 4 is slidably connected to the test bench 1, and a screw is provided for locking the position of the fixing plate 4;

[0062] In this embodiment, through the above arrangement, the position of the fixing plate 4 can be changed, so the position of the clamping plate 10 just in contact with the test bench 1 can be changed to adapt to diodes of different specifications.

[0063] When the present invention is used, the position of the fixing plate 4 is manually adjusted according to the size of the diode housing, the forward and reverse screw rods 24 are rotated to adjust the initial position of the lever 31, and the position of the cylinder 2 is adjusted according to the length of the lead wire;

[0064] After the adjustment is completed, first manually place the diode to be tested into the groove, with the diode placement direction consistent with the groove, then operate the cylinder 2 41 to make the pressing block 42 press the diode and then reset it, in order to make the diode flat and horizontal in the groove;

[0065] Then, the power mechanism 39 is operated to move the power shaft 40 upward. The two ends of the power shaft 40 pass through the two spiral holes 38 respectively, so the moving power shaft 40 causes the shaft tube 32 and the second driving arm 33 connected to the shaft tube 32 to rotate, thereby pushing the second moving shaft 30 and the lever 31 to move along the sixth through hole 28 and the seventh through hole 29 in turn. When the second moving shaft 30 moves along the sixth through hole 28, the lever 31 moves from the oblique side surface of the diode to the positive side surface of the diode. When the second moving shaft 30 moves along the seventh through hole 29, the lever 31 approaches the diode to center the diode.

[0066] Center the diode and keep it in the center state, operate the two motors 19 to rotate the shaft 17 and the driving arm 18, and the two motors 19 turn in opposite directions. Taking the left motor 19 as an example, the motor 19 drives the shaft 17 and the driving arm 18 to rotate clockwise. Since the shaft 17 is above the middle position of the through hole 2 6, the driving arm 18 always generates thrust on the moving shaft 7, so that the moving shaft 7 moves along the through hole 1 5 and the through hole 2 6 successively. The through hole 1 5 is vertical, so the moving shaft 1 7, the moving plate 8, the connecting shaft 9, the clamping plate 10, the extension rod 11 and the guide shaft 12 all move downward, and the relative position between the guide shaft 12 and the cross plate 13 changes, but it will not affect the front and rear position of the guide shaft 12;

[0067] Then the moving shaft 1 7 moves along the through hole 2 6. Since the two-stage lead wire is thin, when the moving shaft 1 7 is on the through hole 2 6, the bottom end of the clamping plate 10 contacts the top of the test bench 1, and when the clamping plate 10 just contacts the top of the test bench 1, the clamping plate 10 is on both sides of the lead wire. The through hole 2 6 is set horizontally. Similarly, the moving plate 8, the connecting shaft 9, the clamping plate 10, the extension rod 11 and the guide shaft 12 are driven to move horizontally, thereby pushing the guide shaft 12 to move along the through hole 3 14, the through hole 4 15 and the through hole 5 16. When moving along the through hole 3 14, the extension rod 11, the clamping plate 10 and the guide shaft 12 are driven to move horizontally. 10 rotates with the connecting shaft 9 as the axis, and the clamp 10 moves away from the connecting shaft 9 and approaches the diode, so that the lead is in the middle position. When moving along the through hole four 15, the angle of the clamp 10 remains unchanged, and the remaining length of the lead is straightened. When there is a section of the lead left, the motor 19 is stopped, and then the cylinder 12 is operated to make the test piece 3 descend and contact the end of the lead. After the test is completed, the motor 19 is continued to be turned on to move the guide shaft 12 to the through hole five 16, so that the clamp 10 is opened away from the connecting shaft 9, the lead is released, and then the diode is manually removed, and the test is completed.

[0068] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. Photoelectric product performance testing equipment, It is characterized in that include: The test bench has a groove for placing the diode housing, and both sides of the test bench are slidably provided with a reset mechanism; the bottom end of the test bench is provided with a centering mechanism for centering the diode through an adjustment mechanism; A clamping mechanism is provided in the middle of the test bench, and cylinder 1 is provided at both ends of the test bench, and a test piece is fixed at the output end of cylinder 1; The reset mechanism includes a fixed plate, the fixed plate is provided with a through hole 1 and a through hole 2 which are connected, the through hole 1 and the through hole 2 form a right angle, and also includes a moving shaft 1 passing through the through hole 1, and the moving plate is fixed at one end of the moving shaft 1; Connecting shafts are rotatably mounted on both sides of the moving plate, a clamping plate is fixed to one end of the connecting shaft, one end of an extension rod is fixed to the other end, and a guide shaft is fixed to the other end of the extension rod; It also includes a horizontal plate fixedly connected to the fixed plate, the horizontal plate is provided with two symmetrical guide holes, the guide holes include through hole three, through hole four and through hole five, the guide shaft passes through the guide holes, and through hole three and through hole five are both inclined; The reset mechanism also includes a rotating shaft rotatably mounted on the fixed plate, a driving arm 1 is fixed to the rotating shaft, the driving arm 1 is slidably connected to the other end of the moving shaft 1, and a motor is fixed to the end of the rotating shaft; The reset mechanism also includes a track 1 fixedly connected to the fixed plate, a slider 1 sliding on the track 1, a track 2 fixed on the slider 1, a slider 2 sliding on the track 2, and a movable shaft 1 fixedly connected to the slider 2; The adjustment mechanism includes forward and reverse screw rods rotatably connected to the test bench, both sides of the forward and reverse screw rods are threadedly connected with screw sleeves, and the screw sleeves are slidably connected to the test bench; The centering mechanism includes a base plate fixedly connected to the screw sleeve, the base plate is provided with a through hole 6 and a through hole 7 connected to each other, the through hole 6 and the through hole 7 form a right angle, and also includes a moving shaft 2 passing through the through hole 6, and a lever is fixed at one end of the moving shaft 2; The base plate is rotatably mounted with an axis tube, the axis tube is fixed with a second driving arm, and the second driving arm is slidably connected with the other end of the second moving axis; The centering mechanism also includes a track 3 fixedly connected to the base plate, a slider 3 sliding on the track 3, a track 4 fixed on the slider 3, a slider 4 sliding on the track 4, and a movable shaft 2 fixedly connected to the slider 4; A spiral hole is provided in the lower half of the shaft tube, and the centering mechanism also includes a power mechanism connected to the test bench, a power shaft is fixed at the output end of the power mechanism, and two ends of the power shaft pass through two spiral holes respectively; A notch is provided at the shaft tube on the opposite side of the spiral hole; The clamping mechanism comprises a bracket fixed in the middle of the test bench, a second cylinder is fixed on the bracket, and a pressure block is fixed on the output end of the second cylinder; Support frames are fixed at both ends of the test bench, and the cylinder 1 is slidably connected to the support frame; The fixing plate is slidably connected to the test bench; During the test, the diode with irregular anode and cathode leads is automatically leveled and placed in the groove, and then the diode is centered, and then the anode and cathode leads are automatically straightened to facilitate contact between the test piece and the anode and cathode leads.

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