A test fixture for chip resistors

Abstract

The application discloses a test fixture for chip resistors and belongs to the technical field of electronic component detection. The test fixture comprises a mounting plate, a supporting table fixedly connected to the top of the mounting plate and a control base fixedly connected to the bottom of the mounting plate. A placing mechanism is arranged on the top of the supporting table and used for placing chip resistors. An ejection mechanism is arranged inside the supporting table and used for ejecting the tested resistors from the inner groove. The placing mechanism comprises two frames symmetrically arranged on the top of the supporting table. The two frames are synchronously expanded or closed by the second electric push rod, so that the chip resistors can be conveniently placed or taken out. The gap between the original placing groove and the chip resistors is small, the problem that the taking process is troublesome is solved, the operation efficiency is improved, and the fixture versatility is enhanced by replacing the placing template to adapt to different models of chip resistors.

Description

Technical Field

[0001] This application relates to the field of electronic component testing technology, and more specifically, to a test fixture for chip resistors. Background Technology

[0002] Chip resistors, also known as surface mount resistors, are one of the most commonly used electronic components in surface mount technology. Their core characteristics are small size, high precision, and suitability for automated production. They are widely used in consumer electronics, medical equipment, automotive electronics, and other fields.

[0003] The surface mount resistor test fixture is a specialized device used for the rapid and accurate testing of key parameters such as resistance, accuracy, and temperature coefficient of surface mount resistors. Its core function is to screen out unqualified products and ensure stable circuit performance. It is widely used in resistor production inspection, incoming material inspection, and R&D testing scenarios.

[0004] However, existing test fixtures typically have fixed placement slots to position surface mount resistors. To ensure stability during testing, the gap between the placement slot and the surface mount resistor is designed to be small. Although this structure can meet the positioning requirements, in actual operation, when it is necessary to place or remove the surface mount resistor, the narrow gap requires the operator to spend more time and effort on alignment and placement. The cumbersome handling process can easily reduce the overall testing efficiency.

[0005] In view of this, we propose a test fixture for chip resistors. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this application proposes a test fixture for chip resistors.

[0007] This application provides a test fixture for surface mount resistors, comprising: Mounting plate, with a support platform fixed to the top and a control base fixed to the bottom; The placement mechanism, located on top of the support platform, is used to place surface mount resistors; The ejection mechanism, located inside the support platform, is used to eject the tested resistor from the inner slot. The placement mechanism includes two frames that slide on the top of the support platform. The two frames are symmetrically arranged. Placement templates are fixedly connected to the inner walls of the frames by bolts. The two placement templates form a placement groove for placing surface mount resistors. The two frames slide along the top of the support platform under the drive of external force.

[0008] As an optional solution to the technical solution of this application, the placement mechanism further includes two connecting pieces fixed to the inner wall of the support platform. A second electric push rod is fixedly connected to the inner wall of the connecting piece. A control module is installed inside the control base. Both second electric push rods are electrically connected to the control module. A first fixing plate is fixedly connected to the output end of the second electric push rod. The first fixing plate is fixedly connected to the side wall of the frame.

[0009] As an optional solution to the technical solution of this application, the ejection mechanism includes a movable groove formed on two frames. A first top block is slidably connected to the inner wall of the movable groove. Two limiting rods are slidably connected inside the first top block. The bottom of the limiting rods is fixedly connected to the top of the mounting plate. Two connecting plates are fixedly connected to the side wall of the first top block. The connecting plates have a downwardly inclined structure. A limiting groove is formed in the middle of the connecting plates. A second fixing plate is fixedly connected to the outer wall of the first fixing plate. A sliding rod is fixedly connected to the side wall of the second fixing plate. The sliding rod slides inside the connecting plate. A slider is fixedly connected to the end of the sliding rod. The slider has an inclined structure and is fitted to the inclined surface of the connecting plate.

[0010] As an optional solution to the technical solution of this application, the limiting rod has a groove inside, and an elastic rope is fixedly connected to the inner wall of the groove. The top of the elastic rope is fixedly connected to the first top block.

[0011] As an optional solution to the technical solution of this application, the placement template has multiple positioning slots through the middle, and multiple positioning blocks are fixed to the inner wall of the frame. The positioning blocks and positioning slots are correspondingly arranged, and a second top block is fixed to the top of the positioning block. The second top block is an arc structure.

[0012] As an optional solution to the technical solution in this application, a rubber pad is fixedly connected to the top of the first top block.

[0013] As an optional solution to the technical solution of this application, the top of the mounting plate is fixedly connected to two first support plates, the side wall of the first support plates is fixedly connected to a second support plate, the side wall of the second support plate is installed with a first electric actuator, and the output end of the first electric actuator is installed with a detector.

[0014] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages: (1) This application adopts a placement mechanism, which drives the two frames to slide open or close synchronously through the second electric push rod, so as to conveniently complete the placement or removal of the chip resistor. This reduces the problem of the small gap between the original placement slot and the chip resistor, which caused trouble in the removal process, and improves the operating efficiency. In the future, the placement template can also be replaced to adapt to different models of chip resistors, thereby enhancing the versatility of the fixture.

[0015] (2) This application achieves automatic ejection of the chip resistor after testing by using the movement and synchronous drive of the second electric push rod to push out the ejection mechanism without the need for an additional power source, thereby improving the material handling efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of a test fixture for chip resistors disclosed in a preferred embodiment of this application; Figure 2 This is a schematic diagram of the support platform structure of a test fixture for chip resistors disclosed in a preferred embodiment of this application; Figure 3 This is a schematic diagram of the ejection mechanism of a test fixture for surface mount resistors disclosed in a preferred embodiment of this application. Figure 4 for Figure 3 Enlarged view of point A.

[0017] The following are the labels in the diagram: 1. Mounting plate; 11. Support platform; 12. Control base; 13. First support plate; 14. Second support plate; 15. First electric actuator; 16. Detector; 2. Placement mechanism; 21. Frame; 22. Placement template; 23. Connecting piece; 24. Second electric actuator; 25. First fixing plate; 3. Ejection mechanism; 31. Movable groove; 32. First top block; 33. Connecting plate; 34. Limiting groove; 35. Second fixing plate; 36. Sliding rod; 37. Sliding block; 38. Limiting rod; 381. Groove; 382. Elastic rope; 4. Positioning groove; 41. Positioning block; 42. Second top block. Detailed Implementation

[0018] The present application will be further described in detail below with reference to the accompanying drawings.

[0019] Reference Figures 1-4This application discloses a test fixture for surface mount resistors. 1. A test fixture for surface mount resistors, characterized in that it comprises a mounting plate 1, a placement mechanism 2, and an ejection mechanism 3. A support platform 11 is fixedly connected to the top of the mounting plate 1, and a control base 12 is fixedly connected to the bottom of the mounting plate 1. A surface mount resistor is placed on the top of the support platform 11; a control base 12 is placed inside the support platform 11 to eject the tested resistor from the inner groove. The placement mechanism 2 includes two frames 21 that slide on the top of the support platform 11. The two frames 21 are symmetrically arranged, and placement templates 22 are fixedly connected to the inner walls of the frames 21 by bolts. The two placement templates 22 form placement grooves for placing surface mount resistors. The frame 21 is driven by an external force to slide along the top of the support platform 11; the placement mechanism 2 also includes two connecting pieces 23 fixed to the inner wall of the support platform 11, and a second electric push rod 24 is fixedly connected to the inner wall of the connecting piece 23. A control module is installed inside the control base 12. Both second electric push rods 24 are electrically connected to the control module. A first fixing plate 25 is fixedly connected to the output end of the second electric push rod 24. The first fixing plate 25 is fixedly connected to the side wall of the frame 21; two first support plates 13 are fixedly connected to the top of the mounting plate 1. A second support plate 14 is fixedly connected to the side wall of the first support plate 13. A first electric push rod 15 is installed on the side wall of the second support plate 14. A detector 16 is installed at the output end of the first electric push rod 15. First, the chip resistor is placed between the placement slots formed by the two placement templates 22. Then, the control module drives two second electric actuators 24. The second electric actuators 24 drive the frame 21 to slide through the first fixing plate 25, so that the two frames 21 close to position the chip resistor. Next, the first electric actuator 15 drives the detector 16 to move down to test the chip resistor on the support platform 11. If the placement template 22 needs to be replaced, the bolts are loosened to remove the old template, and a new placement template 22 of the corresponding model is replaced. After tightening the bolts, the frame 21 is driven to slide by the second electric actuators 24 to realize the placement or removal of the chip resistor. This step, by driving the two frames 21 to slide synchronously open or close through the second electric actuators 24, conveniently completes the placement or removal of the chip resistor, reducing the problem of the small gap between the original placement slot and the chip resistor, which caused trouble in the removal process, and improving the operation efficiency. In the future, the placement templates 22 can also be replaced to adapt to different models of chip resistors, enhancing the versatility of the fixture.

[0020] Reference Figures 1-4The ejection mechanism 3 includes movable slots 31 formed on two frames 21. A first top block 32 is slidably connected to the inner wall of the movable slot 31. Two limiting rods 38 are slidably connected inside the first top block 32. The bottom of the limiting rods 38 is fixedly connected to the top of the mounting plate 1. Two connecting plates 33 are fixedly connected to the side wall of the first top block 32. The connecting plates 33 have a downward inclined structure. A limiting slot 34 is formed in the middle of the connecting plates 33. A second fixing plate 35 is fixedly connected to the outer wall of the first fixing plate 25. A sliding rod 36 is fixedly connected to the side wall of the second fixing plate 35. The sliding rod 36 slides inside the connecting plate 33. A slider 37 is fixedly connected to the end of the sliding rod 36. The slider 37 has an inclined structure and is fitted to the inclined surface of the connecting plate 33. A rubber pad is fixedly connected to the top of the first top block 32. When the second electric push rod 24 drives the first fixed plate 25 to move, the second fixed plate 35 on the first fixed plate 25 drives the slide rod 36 to slide in the limiting groove 34 of the connecting plate 33. The slider 37 is in contact with the inclined surface of the connecting plate 33, pushing the connecting plate 33 and the first top block 32 to slide upward along the limiting rod 38. The rubber pad on the top of the first top block 32 pushes the tested chip resistor out from the movable groove 31. Conversely, when the second electric push rod 24 retracts into the support platform 11, the first top block 32 can be reset under its own weight. This step, by using the movement of the second electric push rod 24 to synchronously drive the ejection mechanism 3, can realize the automatic ejection of the tested chip resistor without an additional power source, improving the material handling efficiency. The rubber pad on the top of the first top block 32 prevents damage to the chip resistor during ejection.

[0021] Reference Figures 1-4 The limiting rod 38 has a groove 381 inside, and an elastic rope 382 is fixedly connected to the inner wall of the groove 381. The top of the elastic rope 382 is fixedly connected to the first top block 32. When the first top block 32 slides upward along the limiting rod 38, the elastic rope 382 is stretched. When the sliding rod 36 no longer pushes the connecting plate 33, the elastic restoring force of the elastic rope 382 pulls the first top block 32 to slide downward along the limiting rod 38 to reset. This step provides power for the first top block 32 to reset through the elastic rope 382, ​​ensuring that the ejection mechanism 3 automatically resets after completing the ejection action, which is convenient for the next test.

[0022] Reference Figures 1-4The template 22 has multiple positioning slots 4 through its middle section. Multiple positioning blocks 41 are fixed to the inner wall of the frame 21. The positioning blocks 41 and the positioning slots 4 are correspondingly set. A second top block 42 is fixed to the top of the positioning block 41. The second top block 42 has an arc structure. When installing the template 22, the positioning slots 4 of the template 22 are aligned with the positioning blocks 41 on the inner wall of the frame 21, so that the positioning blocks 41 are inserted into the positioning slots 4. At the same time, the second top block 42 assists in positioning, completing the initial positioning of the template 22. Then, the template 22 is fixed to the frame 21 with bolts. This step achieves rapid initial positioning of the template 22 through the cooperation of the positioning blocks 41 and the positioning slots 4 and the arc structure of the second top block 42, improving the efficiency of replacing or installing the template 22.

[0023] In summary, when using the surface mount resistor testing fixture disclosed in this application embodiment, the surface mount resistor is first placed between the placement slots formed by two placement templates 22. Then, the control module drives two second electric push rods 24. The second electric push rods 24 drive the frame 21 to slide via the first fixing plate 25, causing the two frames 21 to close and position the surface mount resistor. Next, the first electric push rod 15 drives the detector 16 to move downwards to test the surface mount resistor on the support platform 11. If the placement template 22 needs to be replaced, the bolts are loosened to remove the old template, a new placement template 22 of the corresponding model is replaced, and the bolts are tightened. Then, the frame 21 is driven to slide via the second electric push rods 24 to place or remove the surface mount resistor. When the second electric push rods 24 drive the first fixing plate 25 to move, the second fixing plate 35 on the first fixing plate 25 drives the slide rod 36 to slide within the limiting groove 34 of the connecting plate 33, and the slide block 37... When the connecting plate 33 is in contact with the inclined surface, the connecting plate 33 and the first top block 32 are pushed to slide upward along the limiting rod 38. The rubber pad on the top of the first top block 32 pushes the tested chip resistor out from the movable groove 31. Conversely, when the second electric push rod 24 retracts into the support platform 11, the first top block 32 can be reset under its own weight. When the first top block 32 slides upward along the limiting rod 38, the elastic rope 382 is stretched. When the sliding rod 36 no longer pushes the connecting plate 33, the elastic restoring force of the elastic rope 382 pulls the first top block 32 to slide downward along the limiting rod 38 to reset. When installing the placement template 22, the positioning groove 4 of the placement template 22 is aligned with the positioning block 41 on the inner wall of the frame 21, so that the positioning block 41 is inserted into the positioning groove 4. At the same time, the second top block 42 assists in positioning, completing the initial positioning of the placement template 22. Then, the placement template 22 is fixed to the frame 21 with bolts.

Claims

1. A test fixture for chip resistors, characterized by, Include: Mounting plate (1), with a support platform (11) fixed to the top of the mounting plate (1) and a control base (12) fixed to the bottom of the mounting plate (1). The placement mechanism (2) is set on top of the support platform (11) and is used to place the chip resistor; The ejection mechanism (3) is located inside the support platform (11) and is used to eject the tested resistor from the inner groove. The placement mechanism (2) includes two frames (21) that slide on the top of the support platform (11). The two frames (21) are symmetrically arranged. The inner walls of the frames (21) are fixedly connected with placement templates (22) by bolts. The two placement templates (22) form placement grooves for placing chip resistors. The two frames (21) are driven by external force to slide along the top of the support platform (11).

2. The test fixture for chip resistors according to claim 1, characterized by: The placement mechanism (2) also includes two connecting pieces (23) fixed to the inner wall of the support platform (11). The inner wall of the connecting piece (23) is fixed with a second electric push rod (24). The control base (12) is equipped with a control module. Both second electric push rods (24) are electrically connected to the control module. The output end of the second electric push rod (24) is fixed with a first fixing plate (25). The first fixing plate (25) is fixedly connected to the side wall of the frame (21).

3. The test fixture for chip resistors according to claim 2, characterized by: The ejection mechanism (3) includes a movable groove (31) opened on two frames (21). A first top block (32) is slidably connected to the inner wall of the movable groove (31). Two limiting rods (38) are slidably connected inside the first top block (32). The bottom of the limiting rods (38) is fixedly connected to the top of the mounting plate (1). Two connecting plates (33) are fixedly connected to the side wall of the first top block (32). The connecting plates (33) are downwardly inclined. A limiting groove (34) is opened in the middle of the connecting plates (33). A second fixing plate (35) is fixedly connected to the outer wall of the first fixing plate (25). A sliding rod (36) is fixedly connected to the side wall of the second fixing plate (35). The sliding rod (36) slides inside the connecting plate (33). A slider (37) is fixedly connected to the end of the sliding rod (36). The slider (37) is inclined. The slider (37) and the inclined surface of the connecting plate (33) are fitted together.

4. The test fixture for chip resistors according to claim 3, wherein: The limiting rod (38) has a groove (381) inside, and an elastic rope (382) is fixedly connected to the inner wall of the groove (381). The top of the elastic rope (382) is fixedly connected to the first top block (32).

5. The test fixture for chip resistors according to claim 1, characterized by: The placement template (22) has multiple positioning slots (4) through the middle, and multiple positioning blocks (41) are fixed to the inner wall of the frame (21). The positioning blocks (41) and the positioning slots (4) are set in correspondence. A second top block (42) is fixed to the top of the positioning block (41). The second top block (42) is set with an arc structure.

6. The test fixture for chip resistors according to claim 3, wherein: A rubber pad is fixed to the top of the first top block (32).

7. The test fixture for chip resistors according to claim 1, characterized by: The mounting plate (1) has two first support plates (13) fixed to its top. The first support plate (13) has a second support plate (14) fixed to its side wall. The second support plate (14) has a first electric push rod (15) installed on its side wall. The first electric push rod (15) has a detector (16) installed at its output end.

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