Lead firmness test device and test method

Abstract

The invention discloses a lead firmness test device and method, and the device comprises a test frame, a lifting device, a tension device, an upper clamping assembly which is fixedly connected with the bottom of the tension device and is used for clamping a lead, a lower clamping assembly which is used for clamping a to-be-tested device body, an arc motion assembly, and a positioning assembly. The arc motion assembly is used for driving the lower clamping assembly to do arc motion when a bending stress test or a lead fatigue test is carried out on a lead of the to-be-tested device so as to apply a corresponding angle to the to-be-tested device; the positioning assembly is used for positioning the lower clamping assembly when a lead tension test is carried out on a lead of a to-be-tested device, so that the lower clamping assembly and the upper clamping assembly are located on the same axis. Through the ingenious design of the clamping assembly, the lifting device, the tension device and the arc motion assembly, a standard firmness test can be carried out on the lead of the to-be-tested device, and the reliability, accuracy and efficiency of the test are improved.

Description

Technical Field

[0001] The invention relates to the technical field of microelectronic device detection, and in particular to a lead firmness test device and a test method. Background Art

[0002] Lead firmness test is an important test method in the reliability test of electronic components. It is used to determine the firmness of device leads (lead ends), the firmness of welding and the sealing, so as to ensure the stability and reliability of electronic components in practical applications. This test method is clearly mentioned in many national standards, such as GJB548 "Microelectronic Device Test Methods and Procedures", GJB360 "Electronic and Electrical Components Test Methods" and GJB128 "Semiconductor Discrete Device Test Methods".

[0003] Taking GJB 548C-2021 as an example, the lead firmness test includes test condition A (tension), test condition B1 (bending stress), test condition B2 (lead fatigue), test condition C1 (lead torque), etc. Among them, the number of tensile tests, bending stress tests, and lead fatigue tests dominates the number of all lead firmness tests, and they are the core test items for evaluating lead firmness. Therefore, it is crucial to invent lead firmness test devices and methods for these three subdivided tests. However, traditional lead firmness test methods have many shortcomings. At present, most lead firmness tests are performed by manually holding devices, hanging weights at the end of the lead and rotating them to perform tensile, bending stress, and lead fatigue tests. This test method has the disadvantages of poor standardization, low accuracy, and time-consuming and labor-intensive. In addition, some lead strength testers on the market use weights to perform lead fatigue tests. The hanging weights will hinder the rotation of the tooling fixture, causing the applied angle to not meet the test requirements, thus affecting the reliability and accuracy of the test. This is the main reason why these tooling accessories are difficult to promote and apply, and solutions urgently need to be developed. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a lead firmness testing device and testing method that can perform standardized lead tension test, bending stress test and lead fatigue test on the device to be tested, thereby improving the reliability, accuracy and efficiency of the test.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a lead firmness testing device, including a horizontally placed test frame, and also including a lifting device arranged on the test frame and a pulling device arranged on the lifting device, an upper clamping assembly fixedly connected to the bottom of the pulling device for clamping the lead, a lower clamping assembly for clamping the main body of the device to be tested, an arc motion assembly and a positioning assembly; the arc motion assembly is used to drive the lower clamping assembly to move in an arc when a bending stress test or a lead fatigue test is performed on the lead of the device to be tested, so as to apply a corresponding angle to the device to be tested; the positioning assembly is used to position the lower clamping assembly when a lead tension test is performed on the lead of the device to be tested, so that the lower clamping assembly and the upper clamping assembly are located on the same axis.

[0006] Furthermore, the test stand includes a base and a support frame arranged on the base, and the lifting device is arranged on the support frame and can drive the tension device to rise and fall.

[0007] Furthermore, the upper clamping assembly includes a fixing block, two first clamping parts arranged on the fixing block and capable of moving toward or away from each other, and a first driving unit for driving the two first clamping parts to move toward each other to clamp the lead wire.

[0008] Furthermore, a first sliding groove is provided at the bottom of the fixing block, and the two first clamping parts are slidably disposed in the first sliding groove;

[0009] Two side walls are respectively arranged on both sides of the fixing block, and the two side walls are respectively located on the outsides of the two first clamping parts, and first threaded holes are respectively arranged on the two side walls; the first driving unit is configured as two first bolts respectively screwed into the first threaded holes of the two side walls, and when the two first clamping parts are driven to move toward each other, the two first bolts are screwed so that their inner ends respectively push the two first clamping parts to move toward each other, thereby clamping the lead wire.

[0010] Furthermore, the lower clamping assembly includes a second clamping portion and a third clamping portion that are arranged opposite to each other, and a second bolt that screws the second clamping portion and the third clamping portion together, and the clamping distance between the second clamping portion and the third clamping portion can be adjusted by screwing the second bolt.

[0011] Furthermore, the second clamping portion and the third clamping portion are both configured to include a straight connecting section and an inclined clamping section, and second threaded holes are symmetrically arranged at the two connecting sections, and the second bolt is threaded in the second threaded hole; a sliding block is arranged on the inner side of the connecting section of the second clamping portion along the length direction of the second bolt, and a second sliding groove is arranged on the inner side of the connecting section of the third clamping portion, and the sliding block is slidably arranged in the second sliding groove.

[0012] Furthermore, the arc motion component is installed on the base through a mounting frame, and the arc motion component includes a slide rail arranged on the mounting frame and a pulley arranged in the slide rail and slidingly matched with the slide rail, and the pulley is fixedly connected to the lower clamping component through a first fixing part.

[0013] Furthermore, the mounting frame includes a base and two slide rail brackets arranged on the base, and two ends of the slide rail are fixed to the two slide rail brackets;

[0014] At least one elongated hole is formed on the base, and at least one third threaded hole is formed on the base corresponding to the elongated hole. The base and the base are fixed together by a third bolt between the elongated hole and the third threaded hole.

[0015] Furthermore, the positioning assembly includes a connecting piece fixedly connected to the first fixing portion and a latch fixing the connecting piece and the base together, and the connecting piece is fixedly connected to the pulley.

[0016] In order to solve the above technical problems, another technical solution adopted by the present invention is: to provide a wire firmness test method, based on the lead firmness test device, to perform a lead tension test, a bending stress test and a lead fatigue test on the device under test, wherein the step of performing a lead tension test on the device under test specifically includes the following sub-steps:

[0017] Put the main body of the device under test between the second clamping part and the third clamping part, and tighten the main body of the device under test by tightening the second bolt;

[0018] Adjust the upper clamping assembly to clamp the lead ends of the device under test;

[0019] Adjust the lifting device to drive the pulling device to apply the specified force upward.

[0020] The step of performing a bending stress test on the device to be tested specifically includes the following sub-steps:

[0021] Remove the latch;

[0022] Put the main body of the device under test between the second clamping part and the third clamping part, and tighten the main body of the device under test by tightening the second bolt;

[0023] Adjust the upper clamping assembly to clamp the lead ends of the device under test;

[0024] Rotate the connecting piece along the slide rail, apply a specified angle to the device under test, bend the lead wire, and slide the slider in the opposite direction to the initial position;

[0025] The step of performing a lead fatigue test on the device under test specifically includes the following sub-steps:

[0026] Remove the latch;

[0027] Put the main body of the device under test between the second clamping part and the third clamping part, and tighten the main body of the device under test by tightening the second bolt;

[0028] Adjust the upper clamping assembly to clamp the lead ends of the device under test;

[0029] Adjust the lifting device to drive the pulling device to apply the specified force upward;

[0030] Rotate the connecting piece along the slide rail, apply a specified angle to the device under test, bend the lead wire, and slide the slider in the opposite direction to the initial position, and repeat this step for a specified number of times.

[0031] The lead firmness test device and test method of the present invention have at least the following beneficial effects: the present invention uses a tensile gauge instead of a weight to apply a specified force to the lead, and controls the fixation and movement of the lower clamping assembly through a positioning assembly, thereby cleverly realizing multiple tests on the firmness of the lead. Compared with the traditional method of hanging a weight at the end of the lead and rotating it by manually holding a device to perform the test, the present scheme not only improves the standardization of the test, making the test results more accurate and reliable, but also saves manpower and improves efficiency; the arc motion assembly can accurately control the movement of the lower clamping assembly, thereby applying an accurate angle in the bending stress test and the lead fatigue test; the upper clamping assembly and the lower clamping assembly are both designed with an adjustable clamping part, and the clamping force can be accurately adjusted by screwing the bolt, ensuring that the lead is subjected to a stable clamping force during the test, thereby avoiding test errors caused by unstable clamping; the leads in different positions can be quickly replaced for testing by adjusting the lower clamping assembly forward and backward through the adjustable base or by directly adjusting the upper clamping assembly, thereby improving the flexibility of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0033] Figure 1 It is a structural schematic diagram of an implementation method of a lead firmness testing device of the present invention.

[0034] Figure 2 It is an assembly diagram of a test frame and a lifting device in one embodiment of a lead wire firmness test device of the present invention.

[0035] Figure 3 It is a schematic structural diagram of an upper clamping assembly in one embodiment of a lead wire firmness testing device of the present invention.

[0036] Figure 4 It is a schematic structural diagram of a fixing block in one embodiment of a lead fastness testing device of the present invention.

[0037] Figure 5 It is a schematic structural diagram of the first clamping portion in one embodiment of the lead fastness testing device of the present invention.

[0038] Figure 6 It is a schematic structural diagram of the lower clamping assembly in one embodiment of the lead firmness testing device of the present invention.

[0039] Figure 7 It is an assembly diagram of the second clamping part and the third clamping part in one embodiment of the lead fastness testing device of the present invention.

[0040] Figure 8 It is an assembly diagram of an arc motion component and a lower clamping component in one embodiment of a lead securement testing device of the present invention.

[0041] Fig. 9 It is another structural schematic diagram of one embodiment of the lead firmness testing device of the present invention.

[0042] Fig.10 This is a flow chart of performing a lead tension test on a device under test in one embodiment of a lead firmness test method of the present invention.

[0043] Fig.11 This is a flow chart of performing a bending stress test on a device under test in one embodiment of a lead firmness test method of the present invention.

[0044] Fig.12 This is a flow chart of performing a lead fatigue test on a device under test in one embodiment of a lead firmness test method of the present invention.

[0045] The meanings of the symbols in the accompanying drawings are:

[0046] Test frame 1, base 11, third threaded hole 111, support frame 12; lifting device 2, screw rod 21, rocker 22, connecting piece 23; tension device 3; upper clamping assembly 4, fixing block 41, first slide groove 411, side wall 412, first threaded hole 4121, first clamping part 42, sliding plate 421, clamping plate 422, first clamping surface 4221, first driving unit 43, first bolt 431; lower clamping assembly 5, second clamping part 51, The third clamping part 52, the connecting section 521, the second threaded hole 5211, the sliding block 5212, the second sliding groove 5213, the clamping section 522, the second clamping surface 5221, the second bolt 53; the arc motion component 6, the slide rail 61, the hollow inner cavity 611, the notch 612, the pulley 62, the first fixing part 63; the positioning component 7, the connecting piece 71, the latch 72; the mounting frame 8, the base 81, the long hole 811, the third bolt 812, the slide rail bracket 82. DETAILED DESCRIPTION

[0047] The present invention will be further described below in conjunction with the accompanying drawings.

[0048] See also Figure 1 The lead fastness test device of this embodiment includes a horizontally placed test frame 1, a lifting device 2 arranged on the test frame 1, and a tension device 3 arranged on the lifting device 2, an upper clamping assembly 4 for clamping the lead fixedly connected to the bottom of the tension device 3, a lower clamping assembly 5 for clamping the main body of the device under test, an arc motion assembly 6 and a positioning assembly 7. The arc motion assembly 6 is used to drive the lower clamping assembly 5 to perform an arc motion when performing a bending stress test or a lead fatigue test on the lead of the device under test, so as to apply a corresponding angle to the device under test. The tension device 3 is used to apply a corresponding tension to the device under test when performing a lead tension test or a lead fatigue test on the lead of the device under test. The positioning assembly 7 is used to position the lower clamping assembly 5 when performing a lead tension test on the lead of the device under test, so that the lower clamping assembly 5 and the upper clamping assembly 4 are located on the same axis.

[0049] See also Figure 2The test frame 1 includes a base 11 and a support frame 12 arranged on the base 11. The lifting device 2 is arranged on the support frame 12 and can drive the tension device 3 to rise and fall. The lifting device 2 includes a screw rod 21 arranged in the support frame 12 along the vertical direction and a rocker 22 perpendicular to the screw rod 21; a horizontal gear (not shown in the figure) is provided at one end of the rocker 22 close to the screw rod 21, and a vertical gear (not shown in the figure) is provided at the corresponding horizontal gear on the screw rod 21. The horizontal gear is meshed with the vertical gear. When the rocker 22 is rotated, the horizontal gear drives the vertical gear to rotate, thereby driving the screw rod 21 to rotate. It should be understood that the connection method of the rocker 22 and the screw rod 21 is not limited to the above-mentioned embodiment. For example, in some embodiments, the vertical transmission between the rocker 22 and the screw rod 21 can also be achieved by the cooperation of the worm and the worm wheel. The lifting device 2 also includes a connecting piece 23 threadedly connected to the screw rod 21. The connecting piece 23 is fixedly connected to the tension device 3 on one side close to the tension device 3, so that when the screw rod 21 rotates, the tension device 3 moves up and down on the screw rod 21 along with the connecting piece 23. In this embodiment, the tension device 3 uses a tension meter.

[0050] See also Figures 3 to 5The upper clamping assembly 4 includes a fixed block 41, two first clamping parts 42 disposed on the fixed block 41 and capable of moving toward or away from each other, and a first driving unit 43 for driving the two first clamping parts 42 to move toward each other to clamp the lead wire. A first slide groove 411 is provided at the bottom of the fixed block 41, and the two first clamping parts 42 are slidably disposed in the first slide groove 411. Two side walls 412 are respectively disposed on both sides of the fixed block 41, and the two side walls 412 are respectively located on the outside of the two first clamping parts 42, and the two side walls 412 are both provided with first threaded holes 4121; the first driving unit 43 is configured as two first bolts 431 respectively screwed into the first threaded holes 4121 of the two side walls 412, and when driving the two first clamping parts 42 to move toward each other, the two first bolts 431 are screwed so that the inner ends thereof respectively push the two first clamping parts 42 to move toward each other, thereby clamping the lead wire. The first clamping portion 42 includes a sliding plate 421 disposed in the first slide groove 411 and a clamping plate 422 for clamping the lead wire. The clamping plate 422 is disposed at one end of the sliding plate 421 close to the axis of the fixing block 41, and the sliding plate 421 is perpendicular to the clamping plate 422. The surface of the clamping plate 422 for clamping the lead wire is a first clamping surface 4221. In this embodiment, the first clamping surface 4221 is designed to be serrated to increase the friction between the lead wire and the clamping force of the upper clamping assembly 4. Due to the thickness limitation of the clamping plate 422, the clamping plate 422 cannot be screwed with the first bolt 431. When the two first clamping parts 42 are driven to move toward each other, the two first bolts 431 push the two clamping plates 422 with their inner ends, thereby driving the two first clamping parts 42 to move toward each other; when the two first clamping parts 42 are driven to move backwards, it is necessary to screw the two first bolts 431 to make the two first bolts 431 away from the two clamping plates 422, and then manually move the two first clamping parts 42 backwards. When it is necessary to replace different leads for testing, the first clamping part 42 can be adjusted to move left and right by screwing the first bolt 431 to select different leads for testing. It should be noted that the bending stress test can be performed on part or all of the leads of the device to be tested at the same time, and the leads arranged in a row can be bent one row at a time. Therefore, before performing the bending stress test, the upper clamping assembly can be replaced with a wide-mouth clamping structure to improve the test efficiency.

[0051] See also Figure 6 and Figure 7The lower clamping assembly 5 comprises a second clamping portion 51 and a third clamping portion 52 which are arranged opposite to each other, and a second bolt 53 which screws the second clamping portion 51 and the third clamping portion 52 together. The clamping distance between the second clamping portion 51 and the third clamping portion 52 can be adjusted by screwing the second bolt 53. The second clamping portion 51 and the third clamping portion 52 are both configured to include a straight connecting section 521 and an inclined clamping section 522. The two connecting sections 521 are symmetrically provided with second threaded holes 5211, and the second bolt 53 is screwed into the second threaded holes 5211. A slider 5212 is provided inside the connecting section 521 of the second clamping section 522 along the length direction of the second bolt 53. A second slide groove 5213 is provided inside the connecting section 521 of the second clamping section 522, and the slider 5212 is slidably provided in the second slide groove 5213. The second bolt 53 is screwed to control the sliding block 5212 to slide in the second slide groove 5213, so that the second clamping portion 51 and the third clamping portion 52 move toward or away from each other. The surface of the clamping section 522 in contact with the device under test is the second clamping surface 5221. In this embodiment, the second clamping surface 5221 is designed to be serrated to increase the friction between the clamping surface and the body of the device under test, thereby increasing the clamping force of the lower clamping assembly 5.

[0052] See also Figure 1 , Figure 8 and Fig. 9 The arc motion component 6 is mounted on the base 11 through a mounting frame 8. The arc motion component 6 includes a slide rail 61 arranged on the mounting frame 8 and a pulley 62 arranged in the slide rail 61 and slidingly matched with the slide rail 61. The structure of the slide rail 61 can be designed according to actual needs. In this embodiment, the slide rail 61 is a U-shaped structure, and the interior of the U-shaped structure is a hollow inner cavity 611. A notch 612 communicating with the hollow inner cavity 611 is provided on one side of the U-shaped structure close to the lower clamping component 5 in the horizontal direction. The notch 612 and the hollow inner cavity 611 form a channel with a T-shaped cross-sectional shape. The pulley 62 is arranged in the channel, including two upper and lower wheel bodies adapted to the slide rail 61 and a center plate fixedly connected to the two wheel bodies respectively. The center plate extends outward through the notch 612 to form a connecting plate 71. The pulley 62 is fixedly connected to the lower clamping assembly 5 via a first fixing portion 63, one end of the first fixing portion 63 is fixedly connected to the bottom of the lower clamping assembly 5, and the other end is fixedly connected to the connecting piece 71. The positioning assembly 7 includes a connecting piece 71 and a latch 72 for fixing the connecting piece 71 and the mounting frame 8 together.

[0053] The mounting frame 8 includes a base 81 and two slide rails 61 brackets arranged on the base 81, and the two ends of the slide rails 61 are fixed to the two slide rails 61 brackets; the base 81 is fixedly connected to the connecting piece 71 through a latch 72. When performing a bending stress test or a lead fatigue test, the latch 72 is removed to ensure that the main body of the device under test can rotate along the slide rail 61 to bend the lead. When performing a lead tension test, the latch 72 needs to be inserted to fix the lower clamping assembly 5 on the base 81. At least one long hole 811 is opened on the base 81, and at least one third threaded hole 111 is opened on the base 11 corresponding to the long hole 811. The base 81 and the base 11 are fixed together by a third bolt 812 between the long hole 811 and the third threaded hole 111. In this embodiment, the base 11 is provided with two long holes 811, which are arranged along the width direction of the base 81, and the two long holes 811 are symmetrical with the central axis along the width direction of the base 81 as the symmetry axis. When it is necessary to replace a different lead for testing, the third bolt 812 can be screwed to loosen the fastening of the base 81, and then the base 81 is moved forward and backward until the upper clamping assembly 4 clamps the target lead, and then the third bolt 812 is screwed to fix the base 81.

[0054] The present invention also discloses a lead firmness test method, based on the lead firmness test device described above, a lead tension test, a bending stress test and a lead fatigue test are performed on the device to be tested. Fig.10 The lead pull test of the device under test includes the following steps:

[0055] S11. Clamp the main body of the device under test.

[0056] Specifically, the DUT body is placed between the second clamping portion 51 and the third clamping portion 52 , and the second bolt 53 is rotated to drive the second clamping portion 51 and the third clamping portion 52 to move toward each other, thereby clamping the DUT body.

[0057] S12, adjusting the upper clamping assembly 4 to clamp the lead ends of the device to be tested.

[0058] Specifically, the first clamping part 42 is adjusted to clamp the lead to be tested by screwing the first bolt 431. It should be noted that if a tension test is required for multiple leads, different leads can be replaced for testing by adjusting the front and rear positions of the base 81 or by screwing the first bolt 431 to drive the first clamping part 42 to move left and right. In addition, clamping the end of the lead can ensure that the tension acts directly on the lead, so as to accurately evaluate the mechanical properties of the lead. If the clamping position is improper, such as clamping in the middle of the lead or close to the device body, it may cause uneven force distribution, affecting the accuracy of the test results.

[0059] S13, adjusting the lifting device 2 to drive the pulling device 3 to apply a specified force upward.

[0060] Specifically, the rocker 22 is rotated to drive the screw rod 21 in the support frame 12 to rotate, and the tension device 3 moves upward on the screw rod 21 along with the connecting member 23, thereby applying a specified tension to the lead wire. In this embodiment, the tension device 3 is a tension meter. When the tension device 3 applies the specified tension, it is necessary to pay close attention to and record the tension value displayed by the tension meter, as well as any possible deformation, breakage or other abnormal conditions of the lead wire.

[0061] In order to evaluate the durability and stability of the lead, in this embodiment, the tension is maintained at a specified value for a period of time according to specific test standards or requirements, and any changes or abnormalities are continuously recorded during this period.

[0062] See also Fig.11 The bending stress test of the device under test includes the following steps:

[0063] S21, remove the latch 72.

[0064] Specifically, the latch 72 is removed to release the fixation of the lower clamping assembly 5 , thereby ensuring that the main body of the device under test can rotate along the slide rail 61 and thus the lead wires are bent.

[0065] S22. Clamp the main body of the device under test.

[0066] Specifically, the DUT body is placed between the second clamping portion 51 and the third clamping portion 52 , and the second bolt 53 is rotated to drive the second clamping portion 51 and the third clamping portion 52 to move toward each other, thereby clamping the DUT body.

[0067] S23, adjusting the upper clamping assembly 4 to clamp the lead ends of the device to be tested.

[0068] Specifically, the first clamping part 42 is adjusted to clamp the test lead by screwing the first bolt 431. It should be noted that the bending stress test can be performed on part or all of the leads of the device under test at the same time, and the leads arranged in a row can be bent one row at a time. Therefore, before performing the bending stress test, the upper clamping assembly can be replaced with a wide-mouth clamping structure to improve the test efficiency.

[0069] S24. Apply a specified angle to the device under test.

[0070] Specifically, the connecting piece 71 is rotated along the slide rail 61, a specified angle is applied to the device under test to bend the lead and the slider 5212 is slid in the opposite direction to the initial position. According to the test requirements, the lead under test should be bent in the direction with the least rigidity. If there is no direction with the least rigidity, it can be bent in any direction. In the process of applying the angle, pay close attention to and read the corresponding angle value on the slide rail 61. After applying the specified angle, record the key data of the lead bending process, such as the bending angle, lead diameter change, breakage, etc.

[0071] See also Fig.12 , the lead fatigue test of the device under test includes the following steps:

[0072] S31, remove the latch 72.

[0073] Specifically, the latch 72 is removed to release the fixation of the lower clamping assembly 5 , thereby ensuring that the main body of the device under test can rotate along the slide rail 61 and thus the lead wires are bent.

[0074] S32. Clamp the main body of the device under test.

[0075] Specifically, the DUT body is placed between the second clamping portion 51 and the third clamping portion 52 , and the second bolt 53 is rotated to drive the second clamping portion 51 and the third clamping portion 52 to move toward each other, thereby clamping the DUT body.

[0076] S33, adjusting the upper clamping assembly 4 to clamp the lead ends of the device to be tested.

[0077] Specifically, the first clamping part 42 is adjusted to clamp the test lead by screwing the first bolt 431. It should be noted that if lead fatigue test is required for multiple leads, the front and rear positions of the base 81 can be adjusted or the first clamping part 42 can be driven to move left and right by screwing the first bolt 431 to replace different leads for testing.

[0078] S34, adjusting the lifting device 2 to drive the pulling device 3 to apply a specified force upward.

[0079] Specifically, the rocker 22 is rotated to drive the screw rod 21 in the support frame 12 to rotate, and the tension device 3 moves upward on the screw rod 21 along with the connecting member 23, thereby applying a specified tension to the lead wire. In this embodiment, the tension device 3 is a tension meter. When the tension device 3 applies the specified tension, it is necessary to pay close attention to and record the tension value displayed by the tension meter.

[0080] S35. Apply a specified angle to the device under test.

[0081] Specifically, the connecting piece 71 is rotated along the slide rail 61 to apply a specified angle to the device under test, so that the lead is bent and the slider 5212 is slid in the opposite direction to the initial position, ready for the next bending, and this step is repeated a specified number of times. In this embodiment, the specified number of tests is three times. According to the test requirements, the lead under test should be bent in the direction with the least rigidity. If there is no direction with the least rigidity, it can be bent in any direction. In the process of applying the angle, pay close attention to and read the corresponding angle value on the slide rail 61. After each application of the specified angle, record the key data in the lead bending process, such as the bending angle, lead diameter change, breakage, etc.

[0082] The present invention uses a dynamometer instead of a weight to apply a specified force to the lead, controls the fixation and movement of the lower clamping assembly through a positioning assembly, and cleverly implements multiple tests on the firmness of the lead. Compared with the traditional method of hanging a weight at the end of the lead and rotating it to perform the test manually, the present invention not only improves the standardization of the test, making the test result more accurate and reliable, but also saves manpower and improves efficiency; the arc motion assembly can accurately control the movement of the lower clamping assembly, thereby applying an accurate angle in bending stress tests and lead fatigue tests; the upper clamping assembly and the lower clamping assembly are both designed with adjustable clamping parts, and the clamping force can be accurately adjusted by screwing the bolts, ensuring that the lead is subjected to a stable clamping force during the test, thereby avoiding test errors caused by unstable clamping; the leads in different positions can be quickly replaced for testing by adjusting the lower clamping assembly forward and backward through the adjustable base or by directly adjusting the upper clamping assembly, thereby improving the flexibility of the test.

Claims

1. A lead wire firmness test device, comprising a horizontally placed test stand, characterized in that: It also includes a lifting device arranged on the test frame and a tension device arranged on the lifting device, an upper clamping assembly fixedly connected to the bottom of the tension device for clamping the lead, a lower clamping assembly for clamping the main body of the device to be tested, an arc motion assembly and a positioning assembly; the arc motion assembly is used to drive the lower clamping assembly to move in an arc when a bending stress test or a lead fatigue test is performed on the lead of the device to be tested, so as to apply a corresponding angle to the device to be tested; the positioning assembly is used to position the lower clamping assembly when a lead tension test is performed on the lead of the device to be tested, so that the lower clamping assembly and the upper clamping assembly are located on the same axis.

2. The lead wire fastness test device according to claim 1, characterized in that: The test frame includes a base and a support frame arranged on the base, and the lifting device is arranged on the support frame and can drive the pulling device to rise and fall.

3. The lead wire fastness test device according to claim 1, characterized in that: The upper clamping assembly comprises a fixing block, two first clamping parts which are arranged on the fixing block and can move toward or away from each other, and a first driving unit for driving the two first clamping parts to move toward each other to clamp the lead wire.

4. The lead wire fastness test device according to claim 3, characterized in that: A first sliding groove is provided at the bottom of the fixing block, and the two first clamping parts are slidably arranged in the first sliding groove; Two side walls are respectively arranged on both sides of the fixing block, and the two side walls are respectively located on the outsides of the two first clamping parts, and first threaded holes are respectively arranged on the two side walls; the first driving unit is configured as two first bolts respectively screwed into the first threaded holes of the two side walls, and when the two first clamping parts are driven to move toward each other, the two first bolts are screwed so that their inner ends respectively push the two first clamping parts to move toward each other, thereby clamping the lead wire.

5. The lead wire fastness test device according to claim 2, characterized in that: The lower clamping assembly includes a second clamping portion and a third clamping portion that are arranged opposite to each other, and a second bolt that screws the second clamping portion and the third clamping portion together. The clamping distance between the second clamping portion and the third clamping portion can be adjusted by screwing the second bolt.

6. The lead wire fastness test device according to claim 5, characterized in that: The second clamping portion and the third clamping portion are both configured to include a straight connecting section and an inclined clamping section, and second threaded holes are symmetrically arranged at the two connecting sections, and the second bolt is screwed into the second threaded holes; a sliding block is arranged on the inner side of the connecting section of the second clamping portion along the length direction of the second bolt, and a second sliding groove is arranged on the inner side of the connecting section of the third clamping portion, and the sliding block is slidably arranged in the second sliding groove.

7. The lead wire fastness test device according to claim 5, characterized in that: The arc motion component is installed on the base through a mounting frame. The arc motion component includes a slide rail arranged on the mounting frame and a pulley arranged in the slide rail and slidingly matched with the slide rail. The pulley is fixedly connected to the lower clamping component through a first fixing part.

8. The lead wire fastness test device according to claim 7, characterized in that: The mounting frame comprises a base and two slide rail brackets arranged on the base, and two ends of the slide rail are fixed on the two slide rail brackets; At least one elongated hole is formed on the base, and at least one third threaded hole is formed on the base corresponding to the elongated hole. The base and the base are fixed together by a third bolt between the elongated hole and the third threaded hole.

9. The lead wire fastness test device according to claim 8, characterized in that: The positioning assembly includes a connecting piece fixedly connected to the first fixing portion and a latch fixing the connecting piece and the base together, and the connecting piece is fixedly connected to the pulley.

10. A lead strength test method, based on the lead strength test device according to any one of claims 1 to 9, to perform a lead tension test, a bending stress test and a lead fatigue test on a device under test, characterized in that: The step of performing a lead pull test on the device under test specifically includes the following sub-steps: Put the main body of the device under test between the second clamping part and the third clamping part, and tighten the main body of the device under test by tightening the second bolt; Adjust the upper clamping assembly to clamp the lead ends of the device under test; Adjust the lifting device to drive the pulling device to apply the specified force upward. The step of performing a bending stress test on the device to be tested specifically includes the following sub-steps: Remove the latch; Put the main body of the device under test between the second clamping part and the third clamping part, and tighten the main body of the device under test by tightening the second bolt; Adjust the upper clamping assembly to clamp the lead ends of the device under test; Rotate the connecting piece along the slide rail, apply a specified angle to the device under test, bend the lead wire, and slide the slider in the opposite direction to the initial position; The step of performing a lead fatigue test on the device under test specifically includes the following sub-steps: Remove the latch; Put the main body of the device under test between the second clamping part and the third clamping part, and tighten the main body of the device under test by tightening the second bolt; Adjust the upper clamping assembly to clamp the lead ends of the device under test; Adjust the lifting device to drive the pulling device to apply the specified force upward; Rotate the connecting piece along the slide rail, apply a specified angle to the device under test, bend the lead wire, and slide the slider in the opposite direction to the initial position, and repeat this step for a specified number of times.

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