Test fixture

Abstract

The present invention discloses a test fixture, which belongs to the technical field of electronic product testing equipment, including a base assembly, including a base and a first limit plate vertically fixed to the base, the side wall of the first limit plate is provided with a connected track groove and a locking groove, one end of the track groove extends to the top of the first limit plate; a test assembly, mounted on the base; a top plate assembly, one end of the top plate assembly is connected to the base, and the top plate assembly can push the product above the probe to contact the probe; a gas spring, one end of the gas spring is hinged to the base, and the other end of the gas spring is hinged to the top plate assembly; a first follower, fixed to the other end of the top plate assembly and can move in the track groove, the shape of the locking groove matches the shape of the first follower, the size of the locking groove matches the size of the first follower, and the locking groove can limit the first follower. The present invention can avoid the situation where the probe and the PIN pin of the product have poor contact or cannot contact, thereby improving the success rate of the test.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic product testing equipment, and in particular to a testing fixture. Background Art

[0002] During the manufacturing process, electronic products undergo a variety of functional tests to ensure their quality. FCT testing is a routine test to verify the proper functioning of electronic products. FCT testing provides a simulated operating environment for the target board, subjecting it to various design states. The test obtains parameters for each state to verify the board's functionality.

[0003] Conventional testing mechanisms are used to verify the proper function of electronic product pins. These testing mechanisms include a clamp, a top plate secured to the clamp's movable end, a carrier plate positioned beneath the top plate, multiple probes inserted into the carrier plate, and a product placed on the carrier plate. When the product is unstressed, the probes and the product's pins are not in contact. Pulling the clamp downward pushes the top plate downward, pushing the product closer to the probes, ensuring contact between the probes and the product's pins, completing the test.

[0004] However, the clamp does not have a locking function, resulting in slight shaking of the clamp even after it is pushed to the bottom, which in turn causes the product to shake slightly, resulting in poor or no contact between the probe and the PIN pin of the product, thus causing the test to fail. Summary of the Invention

[0005] The object of the present invention is to provide a test fixture that can avoid the situation where the probe has poor contact or cannot make contact with the PIN pin of the product, thereby improving the success rate of the test.

[0006] As conceived above, the technical solution adopted by the present invention is:

[0007] Test fixtures, including:

[0008] A base assembly, comprising a base and a first limiting plate vertically fixed to the base, wherein a side wall of the first limiting plate is provided with a track groove and a locking groove connected thereto, and one end of the track groove extends to the top end of the first limiting plate;

[0009] A test assembly is mounted on the base, and the test assembly includes a plurality of probes;

[0010] a top plate assembly, one end of which is connected to the base, and the top plate assembly is capable of pushing the product above the probe into contact with the probe;

[0011] a gas spring, one end of the gas spring being hinged to the base, and the other end of the gas spring being hinged to the top plate assembly;

[0012] a first follower fixedly connected to the other end of the top plate assembly and capable of moving in the track groove; the shape of the locking groove matches the shape of the first follower; the size of the locking groove matches the size of the first follower; and the locking groove can limit the first follower;

[0013] Pulling the top plate assembly can cause the first follower to slide into the track groove and then slide from the track groove to the locking groove.

[0014] Optionally, the top plate assembly has a flipping motion state and a vertical downward motion state. When the top plate assembly is in the flipping motion state, the top plate assembly rotates relative to the base. When the top plate assembly is in the vertical downward motion state, the first follower slides into the track groove, and the top plate assembly moves closer to the base in a direction perpendicular to the base.

[0015] Optionally, the base assembly also includes a second limit plate vertically fixed to the base, and the side wall of the second limit plate is provided with a first arc groove and a first straight groove arranged at an angle and connected. The test fixture also includes a second follower fixed to the top plate assembly, when the top plate assembly is in the flipping motion state, the second follower moves in the first arc groove, and when the top plate assembly is in the vertical downward motion state, the second follower moves in the first straight groove.

[0016] Optionally, the side wall of the second limit plate is further provided with a second arc groove and a second straight groove that are connected, and the test fixture also includes a third follower fixed to the top plate assembly, when the top plate assembly is in the flipping motion state, the third follower moves in the second arc groove, and when the top plate assembly is in the vertical downward motion state, the third follower moves in the second straight groove.

[0017] Optionally, the width of the first arc-shaped groove is the same as the width of the first straight groove, and the extension direction of the first straight groove is parallel to the extension direction of the second straight groove, the width of the second straight groove is greater than the width of the second arc-shaped groove, and the angle between the first arc-shaped groove and the first straight groove is an acute angle, and the angle between the second arc-shaped groove and the second straight groove is an obtuse angle.

[0018] Optionally, the first follower, the second follower and the third follower are all cam bearing followers.

[0019] Optionally, the top plate assembly includes a top plate, a connecting plate and a connecting rod mechanism, a fourth follower is fixed to the side wall of the top plate, one end of the connecting plate has an elongated hole, the connecting plate is slidably connected to the top plate by the fourth follower passing through the elongated hole, the other end of the connecting plate is hinged to the connecting rod mechanism, the connecting rod mechanism is hinged to the top plate, the other end of the gas spring is hinged to the top plate, and the top plate can push the product above the probe to contact the probe, the first follower is fixed to the connecting rod mechanism, and the second follower is fixed to the connecting plate.

[0020] Optionally, the side wall of the second limiting plate is further provided with a third linear groove, and the end of the fourth follower away from the top plate is moved into the third linear groove, and when the top plate assembly is in the vertical downward movement state, the end of the fourth follower away from the top plate moves in the third linear groove.

[0021] Optionally, the extension direction of the third straight groove is perpendicular to the extension direction of the first straight groove.

[0022] Optionally, the top plate is in a square frame shape, and two gas springs are provided. The other ends of the two gas springs are respectively hinged to two opposite inner walls of the top plate, and when the top plate assembly is in the flipping motion state, the gas springs contract.

[0023] Optionally, the connecting rod mechanism includes a first connecting part, a second connecting part and a handle part, the first connecting part is vertically fixed to one end of the second connecting part, the first follower is fixed to the end of the first connecting part away from the second connecting part, the first connecting part is hinged to the top plate through a first rotating shaft passing through the middle thereof, the second connecting part is hinged to the other end of the connecting plate through a second rotating shaft passing through one end thereof, and the handle part is fixed to the other end of the second connecting part.

[0024] Optionally, a ball plunger is further included, and the first limit plate is also provided with a plunger groove with one end extending to the groove wall of the locking groove. The ball plunger is installed in the plunger groove, and when the first follower is located in the locking groove, the head of the ball plunger presses against the first follower.

[0025] Beneficial effects of the present invention:

[0026] The test fixture provided by the present invention has the following characteristics: in the process of the top plate assembly moving close to the base, the first follower can move into the track groove, and the movement track of the top plate assembly is limited by the track groove; when the first follower moves from the track groove to the locking groove, the locking groove can lock the first follower to prevent the first follower from moving in a direction perpendicular to the base, thereby preventing the top plate assembly from moving; since the shape and size of the locking groove match the shape and size of the first follower, the first follower cannot move relative to the locking groove, thereby preventing the top plate assembly from moving or shaking relative to the base, thereby preventing the probe from having poor contact or no contact with the PIN pin of the product, thereby improving the success rate of the test.

[0027] Moreover, the test fixture provided by the present invention does not have power elements such as cylinders, electronic components such as solenoid valves, and auxiliary moving parts such as clamps and guide rails. It only uses gas springs and first followers. The gas springs are more labor-saving to use, which reduces the workload of employees, is more convenient to use, and has lower costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of the test fixture provided by the embodiment of the present invention. Figure 1 ;

[0029] Figure 2 This is a schematic diagram of the structure of the test fixture provided by the embodiment of the present invention. Figure 2 ;

[0030] Figure 3 is a side view of a test fixture provided by an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of the test fixture provided by the embodiment of the present invention. Figure 3 ;

[0032] Figure 5 is a structural schematic diagram of a first limiting plate provided in an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of the decomposition of the top plate assembly provided by the embodiment of the present invention. Figure 1 ;

[0034] Figure 7 This is a schematic diagram of the top plate assembly provided by an embodiment of the present invention. Figure 2 ;

[0035] Figure 8 is a schematic diagram of a test fixture provided by an embodiment of the present invention in a semi-closed state;

[0036] Figure 9 is a schematic diagram of a test fixture provided by an embodiment of the present invention in a semi-closed state with the top plate not shown;

[0037] Figure 10 is a schematic diagram of a test fixture provided by an embodiment of the present invention in a closed state;

[0038] Figure 11 is a schematic diagram of the top plate assembly of the test fixture provided by an embodiment of the present invention when it is in a closed state;

[0039] Figure 12 is a schematic diagram of a test fixture provided by an embodiment of the present invention in a closed state without showing the top plate;

[0040] Figure 13 Schematic diagram of the positions of the first limiting plate and the first follower provided in an embodiment of the present invention;

[0041] Figure 14 1 is a schematic diagram showing the positions of the second follower, the third follower, and the fourth follower provided by an embodiment of the present invention when the test fixture is in an open state;

[0042] Figure 15 1 is a schematic diagram of the positions of the second follower, the third follower, and the fourth follower provided by an embodiment of the present invention when the test fixture is in a semi-closed state;

[0043] Figure 16 1 is a schematic diagram showing the positions of the second follower, the third follower, and the fourth follower provided by an embodiment of the present invention when the test fixture is in a closed state;

[0044] Figure 17 1 is an exploded schematic diagram of a first limit plate, a first follower, and a ball plunger provided in an embodiment of the present invention;

[0045] Figure 18 It is a structural diagram of a product carrier, a product positioning block and a test assembly provided by an embodiment of the present invention.

[0046] In the picture:

[0047] 1. Base assembly; 11. Base; 12. First stop plate; 121. Track slot; 122. Locking slot; 13. Second stop plate; 131. First arcuate slot; 132. First linear slot; 133. Second arcuate slot; 134. Second linear slot; 135. Third linear slot; 14. Plunger slot; 2. Test assembly; 21. Probe; 22. Test carrier; 3. Top plate assembly; 31. Top plate; 311. Target side Wall; 32. Connecting plate; 321. Long hole; 33. Connecting rod mechanism; 331. First connecting part; 332. Second connecting part; 333. Handle part; 34. Fourth follower; 35. Partitioning member; 4. Gas spring; 5. First follower; 6. Second follower; 7. Third follower; 8. First rotating shaft; 9. Second rotating shaft; 10. Ball plunger; 20. Anti-overpressure rod; 30. Product carrier; 40. Product positioning block. DETAILED DESCRIPTION

[0048] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the drawings only show portions relevant to the present invention, not all of them.

[0049] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0050] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0051] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0052] This embodiment provides a test fixture with a locking function, thereby preventing the probe from making poor or no contact with the PIN pin of the product, thereby improving the success rate of the test.

[0053] like Figure 1 and Figure 2 As shown, the test fixture includes a base assembly 1 , a test assembly 2 , a top plate assembly 3 , a gas spring 4 and a first follower 5 .

[0054] The base assembly 1 includes a base 11 and a first limit plate 12 vertically fixed to the base 11. The sidewall of the first limit plate 12 is provided with a track groove 121 and a locking groove 122, wherein one end of the track groove 121 extends to the top of the first limit plate 12, and the other end of the track groove 121 is connected to the locking groove 122. In some embodiments, the base 11 is specifically a box, and the top surface of the base 11 is an inclined surface. The first limit plate 12 is vertically fixed to the top surface of the base 11. In some embodiments, the first limit plate 12 is installed at the edge of the base 11.

[0055] The above-mentioned test component 2 is installed on the base 11, specifically in the middle of the top surface of the base 11, and the test component 2 includes at least a plurality of probes 21, and the probes 21 are used to contact the components to be tested (such as PIN pins) of the product. It should be noted that the test component 2 also includes other components, such as a test circuit and a test carrier 22. The test circuit is electrically connected to the probe 21, and the probe 21 is fixedly mounted on the test carrier 22. In some embodiments, the test carrier 22 includes a probe base, a needle plate fixed on the probe base, and a probe carrier fixed on the needle plate, and the probe 21 is plugged into the probe carrier.

[0056] See Figure 1 One end of the top plate assembly 3 is connected to the base 11. In some embodiments, one end of the top plate assembly 3 is rotatably connected to the base 11. In addition, the top plate assembly 3 can push the product's under-test component above the probe 21 into contact with the probe 21. Specifically, the top plate assembly 3 can be driven manually or by other components to move closer to the base 11, thereby making the top plate assembly 3 contact with the product and pushing the product closer to the probe 21, so that the product's under-test component contacts the probe 21, thereby completing the product test.

[0057] One end of the gas spring 4 is hinged to the base 11, and the other end of the gas spring 4 is hinged to the top plate assembly 3. Specifically, one end of the gas spring 4 is hinged to one end of the base 11, and one end of the base 11 is connected to one end of the top plate assembly 3, and the other end of the gas spring 4 is hinged to the other end of the top plate assembly 3, so that the gas spring 4 can support the top plate assembly 3. It should be noted that the test fixture has an open state and a closed state; when the test fixture is in the open state, such as Figure 1 and Figure 2 As shown, the gas spring 4 is in an extended state. At this time, the gas spring 4 can provide a supporting force to the top plate assembly 3 to prevent the top plate assembly 3 from falling. When the test fixture is in a closed state, as shown in FIG. Figure 12 As shown, the gas spring 4 is in a contracted state, at which time the gas spring 4 does not provide support to the top plate assembly 3. When the test fixture changes from a closed state to an open state, specifically when the top plate assembly 3 is pulled, the gas spring 4 gradually extends and can provide assistance, so that the user can more easily open the top plate assembly 3. Optionally, the gas spring 4 is specifically a nitrogen spring. A nitrogen spring is a spring that is filled with high-pressure nitrogen in a sealed cylinder and uses the reaction force of the nitrogen as a spring. It can show a smaller spring constant under a larger initial load, so it is more labor-saving and is widely used in the mechanical industry and life. For example, the spring used in the trunk of a car is a nitrogen spring.

[0058] like Figure 3 As shown, the first follower 5 is fixed to the other end of the top plate assembly 3 and can move within the track groove 121. The locking groove 122 can limit the first follower 5. Pulling the top plate assembly 3 causes the first follower 5 to slide into the track groove 121 and then slide from the track groove 121 to the locking groove 122, where it is locked by the locking groove 122. This prevents the top plate assembly 3 from shaking or moving when the test fixture is in the closed state. It should be noted that the first follower 5 can slide or roll within the track groove 121. Preferably, the first follower 5 can roll within the track groove 121 to reduce friction and facilitate the user's pulling of the top plate assembly 3. Optionally, the first follower 5 is a cam bearing follower. Specifically, a cam bearing follower is a shaft bearing with needle rollers mounted on thick-walled outer and inner rings. The shaft of the cam bearing follower is fixed to the top plate assembly 3, and the cam bearing follower can rotate about the axis to achieve rolling within the track groove 121.

[0059] The shape of the locking groove 122 matches the shape of the first follower 5, and the size of the locking groove 122 matches the size of the first follower 5, so that the locking groove 122 can limit the first follower 5 and prevent the first follower 5 from being displaced in the locking groove 122. For example, Figure 5 Shown and Figure 13As shown, the locking groove 122 is a semicircular arc groove. When the first follower 5 moves into the locking groove 122, it can be stuck in the locking groove 122, so that the locking groove 122 limits the movement of the first follower 5 in the direction perpendicular to the base 11, that is, limits the movement of the first follower 5 in the length direction of the first limit plate 12, thereby achieving the locking of the top plate assembly 3, so that the test fixture can remain in a closed state; it should be noted that the first follower 5 can always remain stuck in the locking groove 122 when not affected by external forces, and will not fall out of the locking groove 122. When the closed state of the test fixture needs to be released, the top plate assembly 3 can be pulled along the width direction of the first limit plate 12 to move the first follower 5 along the width direction of the first limit plate 12, and then move out of the locking groove 122 and move into the track groove 121, releasing the lock of the locking groove 122 on the first follower 5, so that the top plate assembly 3 can move. It should be noted that the width direction of the first limit plate 12 is Figure 5 Left and right direction in .

[0060] Alternatively, as Figure 1 and Figure 2 As shown, the test fixture also includes an anti-overpressure rod 20, one end of which is fixedly connected to one of the top plate assembly 3 and the base 11, and the other end of the anti-overpressure rod 20 can contact the other of the top plate assembly 3 and the base 11. The anti-overpressure rod 20 can prevent excessive movement of the top plate assembly 3, thereby preventing the top plate assembly 3 from crushing the product or the probe 21, thereby improving the reliability of the test fixture.

[0061] In the test fixture provided in this embodiment, during the movement of the top plate assembly 3 close to the base 11, the first follower 5 can move into the track groove 121, and the movement track of the top plate assembly 3 is limited by the track groove 121. When the first follower 5 moves from the track groove 121 to the locking groove 122, the locking groove 122 can lock the first follower 5 to prevent the first follower 5 from moving in a direction perpendicular to the base 11, thereby preventing the movement of the top plate assembly 3. Since the shape and size of the locking groove 122 match the shape and size of the first follower 5, the first follower 5 cannot move relative to the locking groove 122, thereby preventing the top plate assembly 3 from moving or shaking relative to the base 11, thereby avoiding the situation where the probe 21 has poor contact or cannot contact with the PIN pin of the product, thereby improving the success rate of the test.

[0062] Moreover, the test fixture provided in this embodiment does not have power elements such as cylinders, electronic components such as solenoid valves, and auxiliary moving parts such as clamps and guide rails. It only uses a gas spring 4 and a first follower 5. The gas spring 4 is more labor-saving to use, reduces the workload of employees, is more convenient to use, and has a lower cost.

[0063] Optionally, the top plate assembly 3 can have both a flipping motion state and a vertical downward motion state during its movement toward the base 11. When the top plate assembly 3 is in the flipping motion state, it rotates relative to the base 11, with the center of rotation being one end of the top plate assembly 3. As the top plate assembly 3 rotates relative to the base 11, the other end of the top plate assembly 3 approaches the base 11, causing the gas spring 4 to gradually contract. After the flipping motion ends, the gas spring 4 is fully contracted. At this point, the test fixture is in a semi-closed state. When the top plate assembly 3 is in the vertical downward motion state, the first follower 5 slides into the track groove 121 and moves toward the base 11 perpendicularly to the base 11. During this process, the top plate assembly 3 contacts the product and pushes it into contact with the probe 21. After the vertical downward motion of the top plate assembly 3 ends, the first follower 5 is restrained in the locking groove 122. Thus, the test fixture provided in this embodiment achieves both flipping and vertical downward motion of the top plate assembly 3 at minimal design cost, completely replacing a pneumatic cylinder and eliminating the need for gas, thus achieving energy conservation and emission reduction.

[0064] like Figures 1 to 4 As shown, the base assembly 1 in this embodiment further includes a second limit plate 13 vertically fixed to the base 11. Specifically, the second limit plate 13 is fixed to one end of the base 11, and the first limit plate 12 is fixed to the other end of the base 11. Figure 6 and Figure 7 As shown, the side wall of the second limiting plate 13 is provided with a first arcuate groove 131 and a first linear groove 132 which are arranged at an angle and are connected, and the test fixture also includes a second follower 6 fixed to the top plate assembly 3. When the top plate assembly 3 is in a flipping motion state, the second follower 6 moves in the first arcuate groove 131, and the first arcuate groove 131 is used to limit the moving path of the top plate assembly 3, so that the top plate assembly 3 can be flipped smoothly. When the top plate assembly 3 is in a vertical downward motion state, the second follower 6 moves in the first linear groove 132, and the first linear groove 132 is used to limit the moving path of the top plate assembly 3, so that the top plate assembly 3 can be pressed vertically downward smoothly. Optionally, as Figures 14 to 16 As shown, the angle between the first arcuate groove 131 and the first straight groove 132 is an acute angle, that is, the first arcuate groove 131 and the first straight groove 132 are arranged in a V shape. In addition, the first straight groove 132 extends along the width direction of the second limiting plate 13, and the width direction of the second limiting plate 13 is parallel to the width direction of the first limiting plate 12. In this embodiment, the first arcuate groove 131 bends toward the first straight groove 132, and the specific length can be a quarter of a circle arc. Optionally, the second follower 6 is a cam bearing follower, and it should be noted that the radial dimension of the second follower 6 is approximately the same as the width of the first arcuate groove 131 and the width of the first straight groove 132, so as to have a better guiding and limiting effect. In this embodiment, the width of the first arcuate groove 131 is the same as the width of the first straight groove 132.

[0065] For further information, please see Figures 14 to 16 The side wall of the second limiting plate 13 is further provided with a second arcuate groove 133 and a second linear groove 134 that are connected. It should be noted that the second arcuate groove 133, the first arcuate groove 131, the first linear groove 132 and the second linear groove 134 are located on the same side wall of the second limiting plate 13. In addition, the test fixture also includes a third follower 7 fixed to the top plate assembly 3. When the top plate assembly 3 is in a flipping motion state, the third follower 7 moves in the second arcuate groove 133, and the second arcuate groove 133 is used to limit the movement path of the top plate assembly 3, so that the top plate assembly 3 can flip smoothly. When the top plate assembly 3 is in a vertical downward pressing motion state, the third follower 7 moves in the second linear groove 134. In this embodiment, the second arcuate groove 133 is bent toward the first linear groove 132. Optionally, the third follower 7 is a cam bearing follower, and the radial dimension of the third follower 7 is substantially the same as the radial dimension of the second arc-shaped groove 133 , so that the second arc-shaped groove 133 can better guide the top plate assembly 3 .

[0066] like Figure 14 As shown, the extension direction of the first linear groove 132 is parallel to the extension direction of the second linear groove 134, so that the mutual cooperation between the first linear groove 132 and the second linear groove 134 can ensure the vertical downward movement of the top plate assembly 3. The width of the second linear groove 134 is greater than the width of the second arcuate groove 133, and the angle between the second arcuate groove 133 and the second linear groove 134 is an obtuse angle.

[0067] Alternatively, as Figure 6 and Figure 7 As shown, the top plate assembly 3 includes a top plate 31, a connecting plate 32, and a connecting rod mechanism 33. A fourth follower 34 is fixed to the side wall of the top plate 31. One end of the connecting plate 32 has an elongated hole 321, within which the fourth follower 34 can slide or roll. The connecting plate 32 is slidably connected to the top plate 31 via the fourth follower 34, which penetrates the elongated hole 321. In other words, the connecting plate 32 can slide relative to the top plate 31. The other end of the connecting plate 32 is hingedly connected to the connecting rod mechanism 33, which is hingedly connected to the top plate 31. By driving the connecting rod mechanism 33 to move, the top plate 31 and the connecting plate 32 can also move. It should be noted that when the floor assembly 3 is in a flipping motion state, the relative position relationship between the connecting plate 32 and the fourth follower 34 remains unchanged; when the floor assembly 3 is in a vertical downward motion state, the top plate 31 drives the fourth follower 34 to rotate, and at the same time, the connecting plate 32 slides relative to the top plate 31 through the fourth follower 34. At this time, the relative position relationship between the connecting plate 32 and the fourth follower 34 is changed by Figure 6 The status shown changes to Figure 11In this embodiment, the fourth follower 34 is a cam bearing follower.

[0068] It should be noted that when the top plate assembly 3 includes the top plate 31, the connecting plate 32 and the connecting rod mechanism 33, the other end of the gas spring 4 is hinged to the top plate 31, and the top plate 31 can push the product above the probe 21 to contact the probe 21, the first follower 5 is fixed to the connecting rod mechanism 33, the second follower 6 is fixed to the connecting plate 32, and the third follower 7 is fixed on the connecting plate 32.

[0069] Alternatively, as Figure 7 As shown, the side wall of the second limiting plate 13 is also provided with a third linear groove 135, and the end of the fourth follower 34 away from the top plate 31 is located in the third linear groove 135. When the top plate assembly 3 is in a flipping motion state, the position of the fourth follower 34 away from the third linear groove 135 remains unchanged; when the top plate assembly 3 is in a vertical downward motion state, the end of the fourth follower 34 away from the top plate 31 moves in the third linear groove 135. Specifically, examples of the movement of the end of the fourth follower 34 away from the top plate 31 in the third linear groove 135 are sliding, rolling, etc., which are not limited to this embodiment. Optionally, the third linear groove 135 extends perpendicularly to the first linear groove 132, and the third linear groove 135 extends along the length of the third limiting plate 13, which is perpendicular to the bottom surface of the base 11. Therefore, the third linear groove 135 can limit the movement of the top plate assembly 3, allowing the top plate assembly 3 to smoothly move vertically downward, thereby applying positive pressure to the product and preventing oblique pressure from causing product misalignment. It should be noted that the radial dimension of the fourth follower 34 at the end away from the top plate 31 is approximately the same as the width of the third linear groove 135, thereby providing a better guiding effect.

[0070] Alternatively, see Figure 4 The connecting rod mechanism 33 includes a first connecting portion 331, a second connecting portion 332, and a handle portion 333. The first connecting portion 331 is vertically fixed to one end of the second connecting portion 332. In some embodiments, the first connecting portion 331 and the second connecting portion 332 are integrally formed and, as a whole, have a sickle-like shape. The first follower 5 is fixed to the end of the first connecting portion 331 away from the second connecting portion 332. The first connecting portion 331 is hinged to the top plate 31 via a first rotating shaft 8 passing through the middle thereof. That is, one end of the first rotating shaft 8 is fixed to the top plate 31, and the first connecting portion 331 is sleeved on the other end of the first rotating shaft 8. In some embodiments, the first connecting portion 331 is equipped with an oil-free bushing. The first connecting portion 331 is sleeved on the first rotating shaft 8 through the oil-free bushing, and the first rotating shaft 8 rotates within the oil-free bushing. The oil-free bushing can withstand heavier loads than bearings and is maintenance-free.

[0071] like Figure 6 As shown, the second connecting portion 332 is hinged to the other end of the connecting plate 32 through the second rotating shaft 9 passing through one end thereof. For example, one end of the second rotating shaft 9 is fixedly mounted on the connecting plate 32, and an oil-free bushing is mounted on one end of the second connecting portion 332. The second connecting portion 332 is sleeved on the second rotating shaft 9 through the oil-free bushing. The handle portion 333 is fixedly connected to the other end of the second connecting portion 332. By pulling the handle portion 333, the first connecting portion 331, the second connecting portion 332, the connecting plate 32 and other components can be pulled to move. In this embodiment, the complex flipping and pressing actions are simplified by pulling the handle portion 333 through the connecting rod mechanism 33, and the connecting rod mechanism 33 can also be locked by the locking groove 122, which is more reasonable than the design of the cylinder and the clamp.

[0072] In this embodiment, Figures 1 to 4 As shown, two sets of first limiting plates 12, second limiting plates 13, and top plate assemblies 3 are provided in a one-to-one correspondence. The two first limiting plates 12 are arranged opposite each other in the width direction of the base 11, and the two second limiting plates 13 are arranged opposite each other in the width direction of the base 11. It should be noted that the top plates 31 of the two sets of top plate assemblies 3 are connected to form an integrated structure. That is, the two sets of top plate assemblies 3 share one top plate 31, and the two sets of top plate assemblies 3 share one handle portion 333. The two ends of the handle portion 333 are respectively connected to a second connecting portion 332 to improve the integrity of the top plate assembly 3. Therefore, in fact, two sets of connecting plates 32, first connecting portions 331, and second connecting portions 332 are provided. By providing two sets of connecting plates 32, first connecting portions 331, and second connecting portions 332, two first limiting plates 12, and two second limiting plates 13, the stability of the movement of the top plate 31 can be improved, and the operability of the top plate 31 can be improved.

[0073] Alternatively, as Figure 1 and Figure 2 As shown, the top plate 31 in this embodiment is in the shape of a square frame. Two gas springs 4 are symmetrically provided, and the other ends of the two gas springs 4 are respectively hinged to the two opposite inner side walls of the top plate 31. For the convenience of description, the side wall of the top plate 31 used to hinge the gas spring 4 is called the target side wall 311. The two target side walls 311 are arranged opposite to each other, and the gas spring 4 is hinged to the inner side of the target side wall 311. The outer side of the target side wall 311 is hinged to the first connecting part 331, and the fourth follower 34 is fixed to the outer side of the target side wall 311. When the top plate assembly 3 is in a flipping motion state, both gas springs 4 are contracted. By providing two gas springs 4, the reliability of supporting the top plate 31 is improved, and the process of converting the test fixture from a closed state to an open state is made more labor-saving.

[0074] Please continue to see Figure 6A partition 35 is provided between the connecting plate 32 and the side wall of the top plate 31 (i.e., the target side wall 311). The partition 35 is fixed to the connecting plate 32 or the top plate 31. The partition 35 serves to separate the connecting plate 32 and the top plate 31 from each other and prevents interference in movement. Similarly, a partition 35 may also be provided between the connecting plate 32 and the linkage 33.

[0075] Alternatively, as Figure 17 As shown, the test fixture also includes a ball plunger 10. The first limit plate 12 is further provided with a plunger groove 14 having one end extending to the wall of the locking groove 122. That is, the wall of the locking groove 122 is provided with a plunger groove 14. The ball plunger 10 is installed in the plunger groove 14. When the first follower 5 is located in the locking groove 122, the head of the ball plunger 10 abuts against the first follower 5. The head of the ball plunger 10 is a sphere and can rotate relative to its body. When the first follower 5 moves into the locking groove 122, it can roll relative to the sphere, reducing the friction when moving into the locking groove 122 and facilitating movement into the locking groove 122. In addition, the abutment of the head can reduce the probability of the first follower 5 falling out of the locking groove 122 when no external force is applied.

[0076] See Figure 18 The test fixture also includes a product carrier 30, which is installed on the base 11 and avoids the test component 2. A plurality of product positioning blocks 40 are provided on the top surface of the product carrier 30. The product positioning blocks 40 are used to position the product to ensure that the product's components to be tested are in smooth contact with the probe 21.

[0077] When using the test fixture provided in this embodiment, the test fixture is in the following Figure 1 In the open state shown, the product is placed on the product carrier 30 and positioned by the plurality of product positioning blocks 40. At this time, the product to be tested is not in contact with the probe 21, and the first follower 5 is not located in the track groove 121. The positions of the second follower 6, the third follower 7 and the fourth follower 34 are as shown in FIG. Figure 14 As shown, the gas spring 4 is in an extended state. Subsequently, the handle portion 333 is pulled to move one end of the top plate 31 closer to the base 11. During this process, the gas spring 4 gradually contracts until it contracts to the position shown in FIG. Figure 9 In the state shown, the top plate assembly 31 is in a flip motion state, specifically, as shown in FIG. Figure 15As shown, the second follower 6 moves from one end of the first arcuate slot 131 to the other end of the first arcuate slot 131, and moves to one end of the first linear slot 132. The third follower 7 moves from one end of the second arcuate slot 133 to the other end, and moves to the second linear slot 134. The position of the fourth follower 34 in the third linear slot 135 remains unchanged. The connecting plate 32 rotates and slides relative to the second limiting plate 13 following the top plate 31. The first follower 5 just moves to one end of the track slot 121. The relative position relationship between the connecting rod mechanism 33, the top plate 31 and the connecting plate 32 remains unchanged. At this time, the test fixture is in the following state. Figure 8 and Figure 9 In the semi-closed state shown, the probe 21 is in a state of just contacting or not contacting the part to be tested of the product.

[0078] Continue to pull the handle 333, the top plate assembly 3 is in a vertical downward movement state, at this time, the first follower 5 moves in the track groove 121, the second follower 6 moves in the first linear groove 132, the third follower 7 moves in the second linear groove 134, and the fourth follower 34 moves in the third linear groove 135 until it moves to the position shown in FIG. Figure 16 The first follower 5 moves into the locking groove 122 when it continues to move, and can be limited by the locking groove 122. Figure 13 The figure shows the state where the first follower 5 is located in the locking groove 122. When the handle portion 333 is pulled, the handle portion 333 rotates relative to the top plate 31 and the connecting plate 32, and presses down the top plate 31 and the connecting plate 32, so that the top plate 31 pushes the product's component to be tested to contact the probe 21, thereby achieving the test of the product. After the test is completed, the handle portion 333 is pulled in a direction away from the base 11, so that the first follower 5 is disengaged from the locking groove 122, and with the assistance of the gas spring 4, the top plate 31 moves away from the base 11 until the test fixture is opened. The present invention uses a connecting rod mechanism 33 through the combination of the gas spring 4 and the cam bearing follower, completely abandoning power components such as cylinders and clamps, simplifying the process, but the corresponding functions are more comprehensive.

[0079] The above embodiments merely illustrate the basic principles and features of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. Test fixture, characterized in that: include: A base assembly (1) comprises a base (11) and a first limiting plate (12) vertically fixed to the base (11), wherein a side wall of the first limiting plate (12) is provided with a track groove (121) and a locking groove (122) that are connected, and one end of the track groove (121) extends to the top end of the first limiting plate (12); A test assembly (2) is mounted on the base (11), and the test assembly (2) includes a plurality of probes (21); A top plate assembly (3), one end of the top plate assembly (3) is connected to the base (11), and the top plate assembly (3) is capable of pushing the product above the probe (21) into contact with the probe (21); A gas spring (4), one end of the gas spring (4) is hinged to the base (11), and the other end of the gas spring (4) is hinged to the top plate assembly (3); A first follower (5) is fixedly connected to the other end of the top plate assembly (3) and is movable in the track groove (121); the shape of the locking groove (122) matches the shape of the first follower (5); the size of the locking groove (122) matches the size of the first follower (5); and the locking groove (122) can limit the first follower (5); Pulling the top plate assembly (3) enables the first follower (5) to slide into the track groove (121) and then slide from the track groove (121) to the locking groove (122); The top plate assembly (3) has a flipping motion state and a vertical downward pressing motion state. When the top plate assembly (3) is in the flipping motion state, the top plate assembly (3) rotates relative to the base (11). When the top plate assembly (3) is in the vertical downward pressing motion state, the first follower (5) slides into the track groove (121), and the top plate assembly (3) moves toward the base (11) in a direction perpendicular to the base (11). The base assembly (1) further includes a second limit plate (13) vertically fixed to the base (11), the side wall of the second limit plate (13) is provided with a first arc groove (131) and a first straight groove (132) arranged at an angle and connected, the test fixture further includes a second follower (6) fixed to the top plate assembly (3), when the top plate assembly (3) is in the flipping motion state, the second follower (6) moves in the first arc groove (131), when the top plate assembly (3) is in the vertical downward pressing motion state, the second follower (6) moves in the first straight groove (132); The side wall of the second limiting plate (13) is further provided with a second arc groove (133) and a second linear groove (134) that are connected. The test fixture further comprises a third follower (7) fixed to the top plate assembly (3). When the top plate assembly (3) is in the flipping motion state, the third follower (7) moves in the second arc groove (133). When the top plate assembly (3) is in the vertical downward pressing motion state, the third follower (7) moves in the second linear groove (134).

2. The test fixture according to claim 1, characterized in that: The width of the first arc-shaped groove (131) is the same as the width of the first straight groove (132), and the extension direction of the first straight groove (132) is parallel to the extension direction of the second straight groove (134), the width of the second straight groove (134) is greater than the width of the second arc-shaped groove (133), and the angle between the first arc-shaped groove (131) and the first straight groove (132) is an acute angle, and the angle between the second arc-shaped groove (133) and the second straight groove (134) is an obtuse angle.

3. The test fixture according to claim 1, wherein: The first follower (5), the second follower (6) and the third follower (7) are all cam bearing followers.

4. The test fixture according to any one of claims 1 to 3, characterized in that: The top plate assembly (3) includes a top plate (31), a connecting plate (32) and a connecting rod mechanism (33), a fourth follower (34) is fixedly provided on the side wall of the top plate (31), one end of the connecting plate (32) has an elongated hole (321), the connecting plate (32) is slidably connected to the top plate (31) through the fourth follower (34) passing through the elongated hole (321), the other end of the connecting plate (32) is hinged to the connecting rod mechanism (33), the connecting rod mechanism (33) is hinged to the top plate (31), the other end of the gas spring (4) is hinged to the top plate (31), and the top plate (31) can push the product above the probe (21) to contact the probe (21), the first follower (5) is fixed to the connecting rod mechanism (33), and the second follower (6) is fixed to the connecting plate (32).

5. The test fixture according to claim 4, characterized in that: The side wall of the second limiting plate (13) is further provided with a third linear groove (135), and one end of the fourth follower (34) away from the top plate (31) is moved into the third linear groove (135), and when the top plate assembly (3) is in the vertical downward movement state, the one end of the fourth follower (34) away from the top plate (31) moves in the third linear groove (135).

6. The test fixture according to claim 5, characterized in that: The extension direction of the third straight groove (135) is perpendicular to the extension direction of the first straight groove (132).

7. The test fixture according to claim 4, characterized in that: The top plate (31) is in a square frame shape, and two gas springs (4) are provided. The other ends of the two gas springs (4) are respectively hinged to two opposite inner side walls of the top plate (31), and when the top plate assembly (3) is in the flipping motion state, the gas springs (4) contract.

8. The test fixture according to any one of claims 5 to 7, characterized in that: The connecting rod mechanism (33) includes a first connecting portion (331), a second connecting portion (332) and a handle portion (333), wherein the first connecting portion (331) is vertically fixed to one end of the second connecting portion (332), the first follower (5) is fixed to one end of the first connecting portion (331) away from the second connecting portion (332), the first connecting portion (331) is hinged to the top plate (31) via a first rotating shaft (8) passing through the middle thereof, the second connecting portion (332) is hinged to the other end of the connecting plate (32) via a second rotating shaft (9) passing through one end thereof, and the handle portion (333) is fixed to the other end of the second connecting portion (332).

9. The test fixture according to any one of claims 1 to 3, characterized in that: It also includes a ball plunger (10), and the first limiting plate (12) is further provided with a plunger groove (14) with one end extending to the groove wall of the locking groove (122). The ball plunger (10) is installed in the plunger groove (14), and when the first follower (5) is located in the locking groove (122), the head of the ball plunger (10) abuts against the first follower (5).

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