A flying probe test fixture

Abstract

The present invention relates to the field of circuit continuity test clamping, and discloses a flying probe test fixture. The fixture includes a reference fixture and a detachable working fixture placed on the reference fixture; the reference fixture is used to provide a horizontal auxiliary clamping base surface; the working fixture is provided with a pressure surface, and when at least one group of workpieces to be tested is placed on the auxiliary clamping base surface, the pressure surface is perpendicular to the auxiliary clamping base surface, and the working fixture can clamp the workpieces to be tested on the pressure surface along the direction of the auxiliary clamping base surface. The present invention can press the workpieces to be tested of ceramic products on the pressure surface of the first substrate in the horizontal direction, and at the same time, the workpieces to be tested are placed horizontally on the auxiliary clamping base surface, and the posture correction of the workpieces to be tested can be completed in multiple directions to avoid tilting and offsetting, so as to ensure that subsequent continuity tests can be carried out smoothly.

Description

Technical Field

[0001] The invention relates to the field of circuit on-off test clamping, in particular to a flying probe test fixture. Background Art

[0002] At present, the continuity determination of ceramic products requires the use of the needle on the flying probe format test instrument to perform continuity testing. In the current testing process, the products are generally picked up, loaded, and unloaded one by one manually.

[0003] Existing tooling can meet the requirements of on-off testing of PCB products, but such tooling is not suitable for testing ceramic products. This is because PCB products are generally large in size and have low precision requirements, while ceramic product testing has the characteristics of high precision requirements, small size, small test points, and many test points. The test point size is about 0.1mm, and the product structure is complex. If traditional tooling is used for clamping, it is easy to cause ceramic products to tilt and shift during the test, and the probability of test failure is high. Testers need to repeatedly adjust the alignment. Test failure will extend the test time and consume a lot of manpower costs. Summary of the invention

[0004] The technical problem solved by the present invention is that the clamping tools used for the on-off test of existing ceramic products are prone to the technical problem of product tilt and deviation.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The invention discloses a flying probe test fixture, comprising a reference fixture and a detachable working fixture placed on the reference fixture; the reference fixture is used to provide a horizontal auxiliary clamping base surface; a pressure surface is provided on the working fixture, when at least one group of workpieces to be tested is placed on the auxiliary clamping base surface, the pressure surface is perpendicular to the auxiliary clamping base surface, and the working fixture can clamp the workpieces to be tested on the pressure surface along the direction of the auxiliary clamping base surface.

[0007] As a further improvement of the above scheme, the working fixture includes a frame, a locking mechanism, a first substrate and at least one group of clamping units; the first substrate is fixed on the frame; one side of the first substrate is a pressure surface; each group of clamping units is used to clamp the corresponding workpiece to be measured on the pressure surface in the horizontal direction; the clamping unit is installed on the frame and can slide along the clamping direction, and the locking mechanism is used to lock the clamping unit to adapt to workpieces to be measured of different sizes.

[0008] As a further improvement of the above scheme, at least two groups of working fixtures are provided, and each group of working fixtures can be rotated and placed on the reference fixture to load the workpiece to be tested, and then fixed on the machine platform of the testing instrument to assist in completing the continuity test of the test surface of the workpiece to be tested.

[0009] As a further improvement of the above scheme, each group of clamping units includes a catheter; the axial direction of the catheter is perpendicular to the pressure surface and can slide relative to the frame along the axial direction; a pressure plate that can slide along the axial direction is installed at one end of each catheter close to the pressure surface, and a first elastic member is arranged between the pressure plate and the catheter; when the workpiece to be measured is placed on the auxiliary clamping base surface, the locking mechanism is used to lock the catheter to a state where a rated distance is maintained with the first base plate, and the first elastic member is used to provide the pressure plate with an elastic supporting force to press the workpiece to be measured against the pressure surface in this state.

[0010] As a further improvement of the above scheme, each group of clamping units further includes a sleeve; the sleeve is a cylindrical structure with one end closed and the other end open; the sleeve has an open end coaxially slidably sleeved on an end of the conduit away from the pressure surface; a second elastic member is provided between the sleeve and the conduit, and the second elastic member is used to provide an elastic supporting force when the sleeve is axially squeezed by the squeezing arm of the test instrument, thereby achieving the fixation of the working fixture;

[0011] As a further improvement of the above scheme, the interior of the catheter is provided with a first cavity and a second cavity which are interconnected and have open ends in sequence along the axial direction; the inner diameter of the first cavity is larger than the inner diameter of the second cavity, and a step is formed at the transition between the two; a core shaft is slidably installed inside the first cavity, and the pressing plate is fixedly connected to the core shaft, so that the pressing plate can slide along the axial direction of the catheter; a first elastic member is arranged in the first cavity, one end of which abuts against the end of the core shaft, and the other end abuts against the step;

[0012] Each clamping unit also includes a connecting rod, a dial button and a dial rod; one end of the connecting rod extends into the first cavity and is fixedly connected to the core shaft, and the other end passes through the second cavity and then extends into the cavity of the sleeve; the second elastic member is arranged in the cavity of the sleeve, one end abuts against the end of the connecting rod, and the other end abuts against the closed end of the sleeve; the side wall of the sleeve is provided with a first guide groove extending along its own axial direction and connected to the internal cavity, the dial button is slidably arranged in the first guide groove, one end of the dial button is threadedly connected to the side wall of the catheter and abuts against the connecting rod in the second cavity; the side wall of the catheter is provided with a second guide groove extending along its own axial direction and connected to the first cavity, the dial rod is slidably arranged in the second guide groove, and the dial rod is fixedly connected to the core shaft.

[0013] As a further improvement of the above scheme, the reference fixture includes a support plate, a pallet, an adjustment plate and a second substrate; the two support plates are arranged in parallel, and the two pallet plates are arranged in parallel between the two pallet plates, and are fixedly connected to each other to form a rectangular frame structure; slots are provided at both ends of the adjustment plate, and the two pallet plates are slidably matched with the slots at both ends; the second substrate is fixed to the adjustment plate by the threaded section on the push rod, and the upper surface of the second substrate is the auxiliary clamping base surface.

[0014] As a further improvement of the above scheme, the frame includes a guide shaft, an upper connecting plate and a lower connecting plate; the upper connecting plate and the lower connecting plate are arranged in parallel, and the two guide shafts are arranged in parallel between the upper connecting plate and the lower connecting plate, and are fixedly connected to each other to form a rectangular frame structure; the first base plate is fixedly connected to the lower connecting plate; all clamping units in each group of working fixtures are fixedly mounted on a bearing mounting plate, and both ends of the bearing mounting plate are respectively slidably mounted on the two guide shafts through linear bearings.

[0015] As a further improvement of the above scheme, the locking mechanism includes two connecting flanges and two adjustable handles corresponding to the two guide shafts respectively; each connecting flange is fixedly connected to the linear bearing of the corresponding guide shaft, and a threaded hole pointing to the corresponding guide shaft is installed on the connecting flange; the screw-in end thread on each adjustable handle fits in the threaded hole of the corresponding connecting flange, and the screw-in end can be pressed against the corresponding guide shaft by rotating the adjustable handle, thereby locking the bearing mounting plate on the guide shaft.

[0016] As a further improvement of the above solution, a plurality of groups of clamping units are provided on the frame, and the plurality of groups of clamping units are linearly and equidistantly distributed along the plane where the bearing mounting plate is located.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention can press the workpiece to be tested horizontally placed on the auxiliary clamping base surface against the vertical pressure surface in the horizontal direction by setting a reference fixture and a working fixture, and can correct the posture of the workpiece to be tested in multiple directions to avoid tilting and deviation. More noteworthy is that the present invention utilizes the matching structure of the double fixtures. When working, the reference fixture is used as the bottom and the working fixture is used as the transfer piece, thereby ensuring the high-precision positioning characteristics of the workpiece to be tested on the working fixture on the one hand, and on the other hand, once all the workpieces to be tested are clamped, the working fixture can be separated from the reference fixture (that is, the two are separable structures, not integrated structures), so that the working fixture is directly used as a test fixture and applied to the machine platform of the test instrument for fixing, which not only avoids the interference of the reference fixture with the flying probe test path, but also further improves the efficiency of the test as a test fixture, thereby ensuring that the subsequent on-off test can be carried out smoothly.

[0019] 2. The present invention provides multiple groups of working fixtures and uses reference fixtures to assist the process of loading products. The reference fixture and the working fixture can be separated from each other. Before the product test, the working fixture is placed flat on the reference fixture to load the product. The loading amount is multiple pieces at a time. It can load products of the same size or products of different sizes for continuity testing. The overall structure and operation are simple, easy to move, and highly versatile. The success rate of continuity testing can be improved and the test time can be shortened. The operator can prepare other working fixtures on the reference fixture while performing continuity testing on the workpiece to be tested on a set of working fixtures, which improves labor efficiency and reduces labor costs.

[0020] 3. Since the clamping units of the present invention clamp products independently of each other, it is possible to complete multiple groups of measurements for the same type of products with a single loading, and to achieve the function of mixed testing of different types of products to reduce the number of loading times; and during the test process, the operator can install the product on the positioning tooling to achieve the recycling of the positioning tooling, thereby improving production efficiency. It can also well meet the clamping requirements for products with larger sizes and higher measurement accuracy, thereby improving the test success rate and further reducing labor costs and time costs.

[0021] 4. The present invention provides a catheter in each clamping unit, and attaches a pressure plate and a sleeve at both ends of the catheter through different elastic parts, and provides a manually adjustable lever on the core shaft where the pressure plate is located. On the one hand, it is convenient to quickly load ceramic products of different types and sizes before testing, and quickly unload ceramic products after the test is completed. On the other hand, when conducting a test, the sleeve and the entire test fixture can be fixed by pressing down the upper arm of the test instrument, further avoiding tilting and deviation of the workpiece to be tested. The setting of the elastic part can avoid damage caused by direct extrusion to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of a flying probe test fixture in an embodiment of the present invention, in which a group of working fixtures are horizontally placed on a reference fixture.

[0023] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the working fixture in the vertical state.

[0024] Figure 3 for Figure 1 Schematic diagram of the three-dimensional structure of the central reference fixture.

[0025] Figure 4 for Figure 1 Schematic diagram of the relative position of the working fixture and the second substrate in a horizontal position.

[0026] Figure 5 for Figure 4 Enlarged view of point B in .

[0027] Figure 6 2 is an exploded view of the locking mechanism in an embodiment of the present invention.

[0028] Figure 7 It is a schematic diagram of the three-dimensional structure of a group of clamping units in an embodiment of the present invention.

[0029] Figure 8 for Figure 7 Front view of the clamping unit.

[0030] Fig. 9 for Figure 8 AA section view in.

[0031] In the figure: 1, reference fixture; 100, auxiliary clamping base surface; 101, support plate; 1010, arc groove; 102, support plate; 103, adjustment plate; 104, second base plate; 2, frame; 201, guide shaft; 202, upper connecting plate; 203, lower connecting plate; 204, push rod; 3, locking mechanism; 301, connecting flange; 302, adjustable handle; 4, clamping unit; 401, first elastic member; 40 2. second elastic member; 403. conduit; 4031. first cavity; 4032. second cavity; 4001. first guide groove; 4002. second guide groove; 404. sleeve; 405. connecting rod; 406. dial button; 407. dial rod; 408. spindle; 409. pressure plate; 5. first substrate; 500. pressure surface; 6. bearing mounting plate; 61. linear bearing; 7. working fixture; 8. workpiece to be measured. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figures 1 to 4 The present embodiment provides a flying probe test fixture, including a frame 2, a locking mechanism 3, at least one set of clamping units 4 and a first substrate 5, and may also include a reference fixture 1.

[0034] The reference fixture 1 is provided with a horizontal auxiliary clamping base surface 100. The reference fixture 1 is placed horizontally and includes a support plate 101, a support plate 102, an adjustment plate 103 and a second substrate 104. The two support plates 101 are arranged in parallel, and the two support plates 102 are arranged in parallel between the two support plates 102, and can be fixedly connected to each other by fasteners to form a rectangular frame structure. The two ends of the adjustment plate 103 are provided with card slots, and the card slots at both ends are respectively slidably matched with the two support plates 102. The second substrate 104 is fixed on the adjustment plate 103 through the threaded sections on the two push rods 204, and one side of the second substrate 104 is the auxiliary clamping base surface 100. The operator can manually adjust the push rod 204 to adjust the position of the adjustment plate 103 in the extension direction of the support plate 102, ensuring that the auxiliary clamping plane can adapt to the workpiece 8 to be tested of different lengths (along the extension direction of the support plate 102), and can meet the requirements of ceramic products of different sizes for on-off testing, thereby improving its versatility.

[0035] Preferably, the support plate 101, the pallet 102, and the adjustment plate 103 can all be machined from aluminum plates according to the size, the purpose of which is to reduce the self-generated weight and facilitate the transfer and removal of the reference fixture 1. The support plate 101 and the pallet 102 can be assembled by matching screws and nuts. The adjustment plate 103 is fitted on the pallet 102 by a slot, can be translated longitudinally, and its upper surface is coplanar with the lower surface of the second substrate 104; the purpose is to ensure that manual leveling is not required when loading products, greatly shortening the loading time; the shape of the support plate 101 is similar to a rectangular aluminum plate with a piece cut out in the middle, the purpose of which is to form a concave shape for the reference fixture 1 as a whole, so that the test fixture can load products on the operating platform, greatly shortening the loading time and the instability of the operating platform for loading products.

[0036] The frame 2 includes a guide shaft 201, an upper connecting plate 202 and a lower connecting plate 203. The upper connecting plate 202 and the lower connecting plate 203 are arranged in parallel, and the two guide shafts 201 are arranged in parallel between the upper connecting plate 202 and the lower connecting plate 203, and are fixedly connected to each other to form a rectangular frame structure. The first base plate 5 is fixedly connected to the lower connecting plate 203. All clamping units 4 in each group of working fixtures 7 are fixedly mounted on a bearing mounting plate 6, and the two ends of the bearing mounting plate 6 are slidably mounted on the two guide shafts 201 through linear bearings 61 respectively. During clamping, the two guide shafts 201 can be horizontally placed in the arc grooves 1010 opened on the two support plates 101 of the reference fixture 1.

[0037] Preferably, the upper connecting plate 202, the lower connecting plate 203, the first substrate 5, and the push rod 204 can all be machined from aluminum plates according to the size, and the guide shaft 201, the upper connecting plate 202, and the lower connecting plate 203 are assembled by matching screws and nuts. The material of the guide shaft 201 is Q235, the purpose of which is that it has high strength, good wear resistance, long service life, and is easy to process and install. The upper connecting plate 202 and the lower connecting plate 203 are processed from aluminum plates, the purpose of which is to reduce the self-generated weight and facilitate the operator to install it on the continuity test instrument. The bottom end of the lower connecting plate 203 is designed with a reinforcing rib, the purpose of which is not only to enhance the stability of the structure and prevent deformation, but also to facilitate the overall installation in the lower arm of the continuity test instrument.

[0038] See also Figure 6 The locking mechanism 3 includes two connecting flanges 301 and two adjustable handles 302 respectively corresponding to the two guide shafts 201. Each connecting flange 301 can be fixedly connected to the linear bearing 61 of the corresponding guide shaft 201 through fasteners, and a threaded hole pointing to the corresponding guide shaft 201 is installed on the connecting flange 301. The screw-in end on each adjustable handle 302 is threadedly engaged in the threaded hole of the corresponding connecting flange 301, and the screw-in end can be pressed against the corresponding guide shaft 201 by rotating the adjustable handle 302, thereby locking the bearing mounting plate 6 on the guide shaft 201. The purpose is to design an up and down adjustment structure for the diversity of ceramic product sizes, so that ceramic products of the same size can be quickly loaded with products and the efficiency of on-off testing can be improved.

[0039] Preferably, the two connecting flanges 301 are machined from aluminum plates according to the size, the two linear bearings 61 are respectively mounted on the two connecting flanges 301 by matching nuts, and the two adjustable handles 302 are mounted on the sides of the connecting flanges 301, and are fixed as a whole on the guide shafts 201 on the left and right sides and the bearing mounting plate 207. The connecting flanges 301 are used to connect the adjustable handles 303, the linear bearings 61, and the bearing mounting plate 207 as a whole, and move up and down as a whole on the guide shaft 201, so as to achieve overall up and down adjustment according to the size of the product. Its purpose is to design an up and down adjustment structure for the diversity of ceramic product sizes, which can meet the requirements of ceramic products of different sizes for on-off testing and has strong versatility. The adjustable handle 302 is made of anodized aluminum in order to prevent and increase the service life.

[0040] There are six groups of clamping units 4 on the frame 2 , and these clamping units 4 are distributed equidistantly in a straight line along the plane where the bearing mounting plate 6 is located.

[0041] In this embodiment, the frame 2 and the first substrate 5, the locking mechanism 3 and the clamping unit 4 arranged on the frame 2 constitute a set of working fixtures 7. There are at least two sets of working fixtures 7, and each set of working fixtures 7 can be rotated and placed on the reference fixture 1 to load the workpiece 8 to be tested, and then fixed on the machine table of the test instrument to assist in completing the continuity test of the test surface of the workpiece 8 to be tested.

[0042] In the traditional technology, for the workpiece 8 to be tested with a long on-off time, the operator needs to wait in front of the test instrument for the product test to be completed, and then unload, pick up, load and other operations, which greatly wastes labor costs, and the operator cannot perform preparatory work such as loading other products during the machine test. The present invention sets multiple groups of working fixtures 7, and uses the reference fixture 1 to assist in loading products (i.e., the workpiece 8 to be tested), and the reference fixture 1 and the working fixture 7 can be separated from each other. Before the product test, the working fixture 7 is placed flat on the reference fixture 1 to load the product, and the loading capacity is 6 pieces at a time. It can load products of the same size or different sizes for on-off testing; the overall structure is simple, small in size and light in weight, easy to move, simple to operate, highly versatile, high in test success rate, and greatly shortens the test time. The operator can prepare other working fixtures 7 on the reference fixture 1 while a group of working fixtures 7 are on the machine to perform on-off testing on the workpiece 8 to be tested, thereby improving labor efficiency and reducing labor costs.

[0043] The first substrate 5 of the present invention is fixed on the frame 2. The pressure surface 500 of the first substrate 5 is perpendicular to the auxiliary clamping base surface 100. When the workpiece 8 to be measured is placed on the auxiliary clamping base surface 100, each group of clamping units 4 is used to clamp the workpiece 8 to be measured on the first substrate 5 in the horizontal direction, so that the orientation of the test surfaces of all the workpieces 8 to be measured is unified. The clamping unit 4 is installed on the frame 2 and can slide along the clamping direction. The locking mechanism 3 is used to lock the clamping unit 4 to adapt to workpieces 8 to be measured of different sizes.

[0044] Please combine Figures 7 to 9 In this embodiment, each clamping unit 4 may include a catheter 403, a sleeve 404, a connecting rod 405, a dial button 406 and a dial rod 407.

[0045] The axial direction of the conduit 403 is perpendicular to the pressure surface 500 and is slidable relative to the frame 2 along the axial direction. Specifically, the conduit 403 can be fixedly mounted on the bearing mounting plate 6 by fasteners. A pressing plate 409 that can slide along the axial direction is installed at one end of each conduit 403 close to the pressure surface 500, and a first elastic member 401 is arranged between the pressing plate 409 and the conduit 403. When the workpiece 8 to be measured is placed on the auxiliary clamping base surface 100, the locking mechanism 3 is used to lock the conduit 403 to a state where the rated spacing is maintained with the first base plate 5, and the first elastic member 401 is used to provide the pressing plate 409 with an elastic supporting force to press the workpiece 8 to be measured against the pressure surface 500 in this state.

[0046] The sleeve 404 can be coaxially slidably installed at the end of the guide tube 403 away from the pressure surface 500 through the hole pre-opened in the upper connecting plate 202. A second elastic member 402 is provided between the sleeve 404 and the guide tube 403, and the second elastic member 402 is used to provide elastic support force when the sleeve 404 is axially squeezed by the squeezing arm (upper arm) of the test instrument, thereby fixing the working fixture 7.

[0047] In this embodiment, the first elastic member 401 and the second elastic member 402 are both springs.

[0048] Specifically, the sleeve 404 is a cylindrical structure with one end closed and the other end open, and the sleeve 404 with an open end is sleeved on the catheter 403. The interior of the catheter 403 is provided with a first cavity 4031 and a second cavity 4032 which are interconnected and have open ends in sequence along the axial direction. The inner diameter of the first cavity 4031 is larger than the inner diameter of the second cavity 4032, and the two form a step at the transition. A core shaft 408 is slidably installed inside the first cavity 4031, and a pressing plate 409 is fixedly connected to the core shaft 408 by a fastener, so that the pressing plate 409 can slide along the axial direction of the catheter 403. The first elastic member 401 is arranged in the first cavity 4031, with one end abutting against the end of the core shaft 408 and the other end abutting against the step.

[0049] One end of the connecting rod 405 extends into the first cavity 4031 and is fixedly connected to the core shaft 408, and the other end penetrates the second cavity 4032 and then extends into the cavity of the sleeve 404. The second elastic member 402 is arranged in the cavity of the sleeve 404, one end of which abuts against the end of the connecting rod 405, and the other end abuts against the closed end of the sleeve 404. The side wall of the sleeve 404 is provided with a first guide groove 4001 extending along its own axial direction and communicating with the internal cavity, and the dial button 406 is slidably arranged in the first guide groove 4001, and one end of the dial button 406 is threadedly connected to the side wall of the conduit 403 and abuts against the connecting rod 405 in the second cavity 4032. The side wall of the conduit 403 is provided with a second guide groove 4002 extending along its own axial direction and communicating with the first cavity 4031, and the dial rod 407 is slidably arranged in the second guide groove 4002, and the dial rod 407 is fixedly connected to the core shaft 408.

[0050] Preferably, the conduit 403, the dial button 406, and the lever 407 are machined from aluminum tubes according to the size, and the connecting rod 405 and the core shaft 408 are machined from Q235 alloy according to the size. The pressure plate 409 is machined from 1060 alloy according to the size, and its material is softer than other materials, and its purpose is to protect the product from being damaged by pressure when clamping the product. The conduit 403 and the sleeve 404 form an assembly shell, and the first elastic member 401, the second elastic member 402, the connecting rod 405, the dial button 406, the lever 407, and the core shaft 408 are sequentially installed inside it, and the pressure plate 409 is installed on the core shaft 408 to fix the product. Its purpose is to facilitate the rapid loading of ceramic products before testing, and the rapid unloading of ceramic products after the test is completed. The second elastic member 402 is selected to be installed in the sleeve 404 in order to reduce the pressure generated by the upper pressure arm when the flying probe test fixture is installed on the continuity tester; the lever 407 and the spring 402 in the guide tube are for the convenience of loading the product before and during the test. The dial button 406 is used to lock 403 and the components below it as a whole after adjusting the position, so as not to be affected by the lower pressure arm of the test instrument, thereby protecting the tested product.

[0051] The above arrangement facilitates quick loading of ceramic products of different types and sizes before testing, and quick unloading of ceramic products after testing. The present invention designs an up-and-down adjustable structure for the diversity of ceramic product sizes, which can meet the requirements of continuity testing of ceramic products of different sizes. When testing different products, there is no need to stop the continuity tester for adjustment, etc., and the invention has strong versatility and is easy to operate.

[0052] When loading the product, the operator can operate the two adjustable handles 302 to release the tightness on the guide shaft 201 (i.e., open the handles) according to the size of the workpieces 8 to be measured in this batch (i.e., 6 pieces), and slide the bearing mounting plate 6 together with the multiple clamping units 4 along the axial direction to the appropriate position. At this time, the distance between each pressure plate 409 and the pressure surface 500 is slightly smaller than the length of the corresponding workpiece 8 to be measured along the axial direction. Then the operator operates the two adjustable handles 302 to press the guide shaft 201 (i.e., close the handles) to lock the position of the multiple guide tubes 403. Next, the operator can manually push one of the levers 407 slightly in the direction away from the pressure surface 500, so that the core shaft 408 drives the corresponding pressure plate 409 to rise, so that the distance between the pressure plate 409 and the pressure surface 500 is increased to be able to place a workpiece 8 to be measured, and at the same time place the workpiece 8 to be measured on the auxiliary clamping base surface 100 and between the pressure plate 409 and the pressure surface 500 in a suitable posture (i.e., the pressed side is as close to the pressure plate 409 as possible), and then release the lever 407, and the pressure plate 409 can press the workpiece 8 to be measured due to the action of the first elastic member 401. Similarly, the remaining workpieces 8 to be measured are clamped one by one to form a set of working fixtures 7.

[0053] In the process of fixing a set of working fixtures 7 on the machine platform of the continuity test instrument, the working fixture 7 originally placed horizontally on the reference fixture 1 needs to be placed vertically (that is, the axis is perpendicular to the horizontal plane). The lower connecting plate 202 of the frame 2 contacts the machine platform. Subsequently, the squeezing arm of the test instrument is operated to squeeze the sleeve 404 in the vertical direction, and the sleeve 404 and the conduit 403 are stationary after relative displacement, so as to maintain the stability of the frame 2. During the squeezing period, due to the action of the second elastic member 402, other components in the clamping unit 4 can be protected to prevent the workpiece 8 to be tested from tilting, deviating and being damaged. It should be noted that the above-mentioned squeezing arm only needs to slightly squeeze the sleeve 404, and the squeezing stroke cannot exceed the maximum deformation distance of the second elastic member 402 to avoid damage to the tooling.

[0054] It should be noted that, for the clamping of some large-sized products, it is necessary to manually loosen the dial button 406 to cancel its limiting effect on the connecting rod 405, so that the clampable range of the clamping unit 4 can be changed, and then the dial button 406 can be locked. When the connecting rod 405 is limited, it is a whole with the catheter 403 and the components below. When the clamping is completed and fixed on the test instrument, the squeezing arm will only act on the sleeve 404 and the second elastic member 402 to disperse the pressure and protect the product. For some small-sized products, the dial button 406 can be kept locked throughout the whole process, as long as the active stroke of the mandrel 408 with the first elastic member 401 meets the size of the product. In addition, when it is necessary to replace the internal components of the clamping unit 4, such as spring failure, the dial button 406 can also be loosened to disassemble the device.

[0055] Since the clamping units 4 of the present invention clamp products independently of each other, it is possible to complete multiple groups of measurements for the same type of products by loading them once, and to achieve the function of reducing the number of loading times by mixed testing of different types of products. Moreover, during the test, the operator can install the product on the positioning tooling to realize the recycling of the positioning tooling and improve production efficiency. It can also well meet the clamping requirements for products with larger sizes and higher measurement accuracy, thereby improving the test success rate and further reducing labor costs and time costs.

[0056] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A flying probe test fixture, characterized in that: The invention comprises a reference fixture (1) and a detachable working fixture (7) placed on the reference fixture (1); the reference fixture (1) is used to provide a horizontal auxiliary clamping base surface (100); a pressure surface (500) is provided on the working fixture (7); when at least one group of workpieces (8) to be measured are placed on the auxiliary clamping base surface (100), the pressure surface (500) is perpendicular to the auxiliary clamping base surface (100), and the working fixture (7) can clamp the workpieces (8) to be measured on the pressure surface (500) along the direction of the auxiliary clamping base surface (100).

2. A flying probe test fixture according to claim 1, characterized in that: The working fixture (7) comprises a frame (2), a locking mechanism (3), a first base plate (5) and at least one group of clamping units (4); the first base plate (5) is fixed on the frame (2); one side of the first base plate (5) is the pressure surface (500); the clamping unit (4) is used to clamp the workpiece (8) to be measured on the pressure surface (500) in a horizontal direction; the clamping unit (4) is mounted on the frame (2) and can slide in the clamping direction, and the locking mechanism (3) is used to lock the clamping unit (4) to adapt to workpieces (8) to be measured of different sizes.

3. A flying probe test fixture according to claim 2, characterized in that: The working fixtures (7) are provided with at least two groups, and each group of working fixtures (7) can be placed on the reference fixture (1) in rotation to load the workpiece (8) to be tested, and then fixed on the machine table of the testing instrument to assist in completing the continuity test of the test surface of the workpiece (8) to be tested.

4. A flying probe test fixture according to claim 3, characterized in that: Each group of clamping units (4) comprises a conduit (403); the axial direction of the conduit (403) is perpendicular to the pressure surface (500) and is slidable relative to the frame (2) along the axial direction; a pressing plate (409) which is slidable along the axial direction is installed at one end of each conduit (403) close to the pressure surface (500), and a first elastic member (401) is arranged between the pressing plate (409) and the conduit (403); when the workpiece (8) to be measured is placed on the auxiliary clamping base surface (100), the locking mechanism (3) is used to lock the conduit (403) to a state where a rated distance is maintained with the first base plate (5), and the first elastic member (401) is used to provide the pressing plate (409) with an elastic supporting force in this state to press the workpiece (8) to be measured against the pressure surface (500).

5. A flying probe test fixture according to claim 4, characterized in that: Each group of clamping units (4) further comprises a sleeve (404); the sleeve (404) is a tubular structure with one end closed and the other end open; the sleeve (404) has an open end coaxially slidably sleeved on an end of the conduit (403) away from the pressure-bearing surface (500); a second elastic member (402) is provided between the sleeve (404) and the conduit (403), and the second elastic member (402) is used to provide an elastic supporting force when the sleeve (404) is squeezed along the axial direction by the squeezing arm of the test instrument, thereby achieving the fixation of the working fixture (7) in which it is located.

6. A flying probe test fixture according to claim 5, characterized in that: The interior of the conduit (403) is provided with a first cavity (4031) and a second cavity (4032) which are interconnected and have open ends in sequence along the axial direction; the inner diameter of the first cavity (4031) is larger than the inner diameter of the second cavity (4032), and a step is formed at the transition point between the two; a core shaft (408) is slidably installed inside the first cavity (4031), and a pressure plate (409) is fixedly connected to the core shaft (408), so that the pressure plate (409) can slide along the axial direction of the conduit (403); a first elastic member (401) is arranged in the first cavity (4031), one end of which abuts against the end of the core shaft (408), and the other end abuts against the step; Each group of clamping units (4) further comprises a connecting rod (405), a dial button (406) and a dial rod (407); one end of the connecting rod (405) extends into the first cavity (4031) and is fixedly connected to the core shaft (408), and the other end passes through the second cavity (4032) and then extends into the cavity of the sleeve (404); the second elastic member (402) is arranged in the cavity of the sleeve (404), one end of which abuts against the end of the connecting rod (405), and the other end abuts against the closed end of the sleeve (404); the side wall of the sleeve (404) is provided with a first guide groove (4001) extending along its own axial direction and communicating with the internal cavity, the dial button (406) is slidably arranged in the first guide groove (4001), one end of the dial button (406) is threadedly connected to the side wall of the guide tube (403) and abuts against the connecting rod (405) in the second cavity (4032); The side wall of the conduit (403) is provided with a second guide groove (4002) extending along its own axial direction and communicating with the first cavity (4031). The lever (407) is slidably arranged in the second guide groove (4002), and the lever (407) is fixedly connected to the core shaft (408).

7. A flying probe test fixture according to any one of claims 1 to 6, characterized in that: The reference fixture (1) comprises a support plate (101), a supporting plate (102), an adjustment plate (103) and a second base plate (104); the two support plates (101) are arranged in parallel, the two supporting plates (102) are arranged in parallel between the two supporting plates (102), and are fixedly connected to each other to form a rectangular frame structure; the adjustment plate (103) has slots at both ends, and is slidably matched with the two supporting plates (102) through the slots at both ends; the second base plate (104) is fixed on the adjustment plate (103) through the threaded section on the push rod (204), and the upper surface of the second base plate (104) is the auxiliary clamping base surface (100).

8. A flying probe test fixture according to any one of claims 1 to 6, characterized in that: The frame (2) comprises a guide shaft (201), an upper connecting plate (202) and a lower connecting plate (203); the upper connecting plate (202) and the lower connecting plate (203) are arranged in parallel, and two guide shafts (201) are arranged in parallel between the upper connecting plate (202) and the lower connecting plate (203), and are fixedly connected to each other to form a rectangular frame structure; the first base plate (5) is fixedly connected to the lower connecting plate (203); all clamping units (4) in each group of working fixtures (7) are fixedly mounted on a bearing mounting plate (6), and the two ends of the bearing mounting plate (6) are respectively slidably mounted on the two guide shafts (201) through linear bearings (61).

9. A flying probe test fixture according to claim 8, characterized in that: The locking mechanism (3) comprises two connecting flanges (301) and two adjustable handles (302) respectively corresponding to the two guide shafts (201); each connecting flange (301) is fixedly connected to the linear bearing (61) of the corresponding guide shaft (201), and a threaded hole pointing to the corresponding guide shaft (201) is installed on the connecting flange (301); the screw-in end on each adjustable handle (302) is threadedly engaged in the threaded hole of the corresponding connecting flange (301), and the screw-in end can be pressed against the corresponding guide shaft (201) by rotating the adjustable handle (302), thereby locking the bearing mounting plate (6) on the guide shaft (201).

10. The flying probe test fixture according to claim 8, characterized in that: The frame (2) is provided with a plurality of groups of clamping units (4), and the plurality of groups of clamping units (4) are linearly and equidistantly distributed along the plane where the bearing mounting plate (6) is located.

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