Four-needle testing equipment for composite conductive paste

Abstract

This invention provides a four-pin testing device for composite conductive paste, comprising a device body with a placement groove inside, the placement groove containing composite conductive paste, a cleaning box inside the device body located on one side of the placement groove, the cleaning box being filled with cleaning fluid, an ultrasonic transmitter mounted on the inner wall of the cleaning box, and a mounting frame fixed to the inner wall of the device body via a connecting rod. This device, through the ultrasonic transmitter in the cleaning box, utilizes ultrasonic vibration in conjunction with the cleaning fluid to perform targeted deep cleaning of the probes, effectively removing stubborn paste residue from the probe crevices, solving the problem of traditional cleaning methods' difficulty in handling crevices. Simultaneously, the wiping sponge inside the mounting frame, through a cross-shaped notch, adheres to the probe, fully absorbing moisture and residual cleaning fluid from the probe surface, preventing moisture or cleaning fluid from interfering with subsequent testing, and significantly improving testing accuracy.

Description

Technical Field

[0001] This utility model relates to the field of four-pin testing technology for composite conductive paste, and in particular to a four-pin testing device for composite conductive paste. Background Technology

[0002] In the performance testing of composite conductive pastes, the four-needle test method is widely used because it can accurately measure their conductivity. However, current four-needle testing equipment has significant technical shortcomings in practical use, making it difficult to meet the requirements for efficient and accurate testing. From the perspective of probe cleaning and maintenance, existing equipment often leaves slurry residue on the probe surface after testing. If cleaning is not thorough, it will directly affect the accuracy of subsequent tests. Traditional cleaning methods mostly rely on manual wiping or simple rinsing, which is not only inefficient but may also cause probe wear due to uneven cleaning force. Although some equipment is equipped with cleaning structures, it lacks targeted deep cleaning methods, which cannot remove stubborn residues in the probe crevices. Furthermore, the moisture or residual cleaning solution on the probe surface after cleaning is not effectively treated, further interfering with test accuracy.

[0003] Therefore, it is necessary to provide a four-pin testing device for composite conductive pastes to solve the above-mentioned technical problems. Utility Model Content

[0004] This invention provides a four-needle testing device for composite conductive paste, which solves the problems in the background art. To address the aforementioned technical problems, this utility model provides a four-needle testing device for composite conductive paste, comprising a device body serving as the overall mounting base. Inside the device body, on one side, is a placement tank for holding the composite conductive paste, and on the other side of the placement tank is a cleaning box filled with cleaning fluid. An ultrasonic transmitter installed on the inner wall of the cleaning box can use the cleaning fluid to ultrasonically clean the probe, effectively removing residual paste. An installation frame is fixed to the inner wall of the device body via a connecting rod. A cross-shaped notch is formed on the surface of a wiping sponge fixed inside the installation frame. This notch fits the probe, absorbing surface moisture and residual cleaning fluid as the probe passes through, thus enhancing the cleaning effect and ensuring testing accuracy in conjunction with the cleaning box. Preferably, a lead screw is symmetrically installed on one side of the top of the device body. One end of the lead screw is driven by a stepper motor. A mounting plate is screwed to the surface of the lead screw through a threaded hole. When the stepper motor drives the lead screw to rotate, the mounting plate can be moved horizontally through the threaded engagement, thereby adjusting the horizontal position of the four-pin test assembly. An electric push rod is vertically installed on the surface of the mounting plate. Its output end passes through the mounting plate and is connected to a mounting base. The four-pin test assembly is installed at the bottom of the mounting base. The extension and retraction of the electric push rod can drive the mounting base and the four-pin test assembly to rise and fall vertically, thereby realizing the contact or separation of the probe with the composite conductive paste, as well as the position switching between the cleaning box and the wiping sponge, and automating the testing, cleaning and wiping process.

[0005] Preferably, the internal height of the slide is equal to the thickness of the mounting plate. This design ensures that the mounting plate slides stably within the slide, preventing tilting or shaking during movement and improving the accuracy of the horizontal movement of the four-pin test assembly. Preferably, a drain pipe is provided below the surface of the cleaning box, and a valve is installed on the drain pipe. When the valve is opened, the drain pipe can discharge the waste liquid in the cleaning box, which facilitates the replacement of the cleaning liquid and ensures the stability of the cleaning effect.

[0006] Preferably, the multiple cross-shaped notches on the surface of the wiping sponge correspond to the probes in the four-needle test assembly, ensuring that the probes accurately pass through the cross-shaped notches, allowing the wiping sponge to fully contact the probes and improving the absorption effect of moisture and residual cleaning solution on the probe surface. Preferably, a controller is installed on the outer surface of the device body. The controller can coordinate the operation of components such as stepper motor, electric push rod, and ultrasonic generator to realize the automated and coordinated operation of processes such as testing, cleaning, and wiping.

[0007] Compared with related technologies, the four-needle testing device for composite conductive paste provided by this utility model has the following advantages: Compared to existing technologies, this equipment utilizes an ultrasonic generator within the cleaning chamber to employ ultrasonic vibrations in conjunction with cleaning fluid for targeted deep cleaning of the probes. This effectively removes stubborn residue from probe crevices, solving the problem of traditional cleaning methods struggling to address crevices. Simultaneously, the wiping sponge within the mounting frame, with its cross-shaped notch, adheres to the probe, fully absorbing moisture and residual cleaning fluid from the probe surface. This prevents moisture or cleaning fluid from interfering with subsequent testing, significantly improving testing accuracy. Through the coordination of a lead screw, stepper motor, mounting plate, and electric push rod, automated horizontal movement and vertical lifting of the four-pin test assembly are achieved, eliminating the need for manual probe position adjustment. This not only improves the efficiency of the testing and cleaning process but also reduces probe wear or positional deviations caused by uneven manual operation, further ensuring testing stability.

[0008] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0009] Figure 1 A schematic diagram of the structure of the four-needle testing device for composite conductive paste provided by this utility model; Figure 2 A schematic diagram of the mounting plate structure for the composite conductive paste four-needle testing device provided by this utility model; Figure 3 A schematic diagram of the cleaning box structure of the four-needle testing device for composite conductive paste provided by this utility model; Figure 4A schematic diagram of the wiping sponge structure for the composite conductive paste four-needle testing device provided by this utility model.

[0010] Numbering on the map: 1. Device body; 2. Cleaning box; 3. Placement slot; 4. Controller; 5. Stepper motor; 6. Slide rail; 7. Lead screw; 8. Mounting plate; 9. Electric push rod; 10. Threaded hole; 11. Mounting base; 12. Four-pin test assembly; 13. Cleaning fluid; 14. Ultrasonic generator; 15. Mounting frame; 16. Wiping sponge; 17. Cross notch; 18. Connecting rod. Detailed Implementation

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Example 1 Please refer to the following: Figure 1-4 The basic support structure provides space for the installation and operation of other components. One side of the device body 1 is connected to the placement slot 3 via a slot. The placement slot 3 is used to hold the composite conductive slurry. This connection method facilitates the removal, placement, and replacement of the placement slot 3, making it convenient to test different composite conductive slurries. On one side of the placement slot 3, a cleaning box 2 is bolted to the inner wall of the device body 1. The cleaning box 2 is filled with cleaning fluid 13. An ultrasonic transmitter 14 is installed on the inner wall of the cleaning box 2 via screws. The bolt connection ensures the stability of the cleaning box 2 installation, while the screw connection ensures the stable operation of the ultrasonic transmitter 14. One end of a connecting rod 18 is fixed to the inner wall of the device body 1 by welding. The other end of the connecting rod 18 is connected to the mounting frame 15 via bolts. A wiping sponge 16 is glued to the inside of the mounting frame 15. A cross-shaped notch 17 is cut through the surface of the wiping sponge 16. Welding ensures a firm connection between the connecting rod 18 and the device body 1, while bolting facilitates the disassembly and maintenance of the mounting frame 15. Glue application allows the wiping sponge 16 to be stably fixed within the mounting frame 15. In terms of function, when the probe needs cleaning, the ultrasonic generator 14 operates, utilizing the high-frequency vibrations generated by the ultrasonic waves in the cleaning fluid 13 to impact the slurry residue on the probe surface and in the crevices, effectively removing stubborn residues. This method is more efficient and thorough than traditional cleaning methods. The cross-shaped notch 17 of the wiping sponge 16 allows it to closely adhere to the probe surface as the probe passes through, absorbing moisture and residual cleaning fluid 13 from the probe surface through the sponge's adsorption properties, preventing these substances from affecting subsequent tests. The cleaning box 2 and the wiping sponge 16 work together, first performing deep ultrasonic cleaning, then using the wiping sponge 16 to treat surface liquids, significantly improving the cleaning effect and ensuring test accuracy, thus solving the problems of traditional cleaning methods.

[0013] Example 2 Please refer to the following: Figure 1-4A lead screw 7 is mounted on one side of the top of the device body 1 via a bearing seat. One end of the lead screw 7 is connected to the output shaft of the stepper motor 5 via a coupling. This connection method ensures that the power of the stepper motor 5 is stably transmitted to the lead screw 7, allowing the lead screw 7 to rotate smoothly. A mounting plate 8 is spirally connected to the surface of the lead screw 7. A threaded hole 10 matching the lead screw 7 is drilled through the surface of the mounting plate 8. The threaded connection allows the mounting plate 8 to move precisely along the axial direction of the lead screw 7 when it rotates. An electric push rod 9 is vertically mounted on the surface of the mounting plate 8 via bolts. The output end of the electric push rod 9 passes through the surface of the mounting plate 8 and is connected to the mounting base 11 via a flange. A four-pin test assembly 12 is mounted on the bottom end of the mounting base 11 via screws. The bolt connection ensures that the electric push rod 9 is firmly installed, the flange connection ensures stable force transmission between the output end of the electric push rod 9 and the mounting base 11, and the screw connection facilitates the replacement and maintenance of the four-pin test assembly 12.

[0014] Its function is as follows: the stepper motor 5 drives the lead screw 7 to rotate. Since the mounting plate 8 is helically connected to the lead screw 7, the rotational motion of the lead screw 7 is converted into the horizontal linear motion of the mounting plate 8, thereby driving the four-pin test assembly 12 to move horizontally, realizing the switching of the probe position between the test position, the cleaning position, and the wiping position. When the electric push rod 9 extends or retracts, it can drive the mounting base 11 and the four-pin test assembly 12 to rise and fall vertically. When testing is required, the electric push rod 9 extends to make the probe descend and contact the composite conductive paste; after the test is completed, the electric push rod 9 retracts to make the probe rise, making it easy to move to the cleaning position and the wiping position. Through the coordinated work of the stepper motor 5, the lead screw 7, the electric push rod 9, and other components, the probe position adjustment is automatically adjusted without manual operation, improving the efficiency of testing and cleaning, while avoiding positional deviations caused by manual operation and ensuring the stability of the test.

[0015] Example 3 Please refer to the following: Figure 1-4 The device body 1 has a slide 6 on its top. The internal height of the slide 6 is equal to the thickness of the mounting plate 8. The slide 6 is connected to the device body 1 by bolts. This size matching ensures that the mounting plate 8 does not wobble when sliding in the slide 6, thus ensuring the stability of the horizontal movement of the mounting plate 8. This, in turn, ensures the accurate positioning of the four-pin test assembly 12 during movement, providing a guarantee for the smooth progress of testing, cleaning, and wiping. Example 4 Please refer to the following: Figure 1-4A drain pipe is welded to the underside of the cleaning box 2, and a valve is threaded onto the drain pipe. Welding ensures a tight seal between the drain pipe and the cleaning box 2, preventing leakage of the cleaning fluid 13; the threaded connection securely installs the valve and facilitates its disassembly and replacement. After the cleaning fluid 13 has been used for a period of time, opening the valve allows waste fluid in the cleaning box 2 to drain through the drain pipe, facilitating timely replacement with new cleaning fluid 13, maintaining its cleanliness, and thus ensuring the effectiveness of ultrasonic cleaning and the quality of probe cleaning. Example 5 Please refer to the following: Figure 1-4 The multiple cross-shaped notches 17 on the surface of the wiping sponge 16 correspond to the probes in the four-pin test assembly 12. The size and position of the notches are designed according to the diameter and distribution of the probes. This correspondence allows the probes to make full contact with the wiping sponge 16 when passing through the cross-shaped notches 17. The sponge wipes the probe surface more thoroughly and can more effectively absorb moisture and residual cleaning fluid 13, further improving the wiping effect, ensuring the dryness and cleanliness of the probes, and laying the foundation for accurate testing.

[0016] Example 6 Please refer to the following: Figure 1-4 A controller 4 is bolted to the outer surface of the device body 1, facilitating its installation and maintenance. The controller 4 is electrically connected to the stepper motor 5, electric push rod 9, and ultrasonic transmitter 14 via wires. It receives feedback signals from each component and sends control commands according to a preset program. For example, it controls the start / stop and rotation direction of the stepper motor 5 to achieve precise movement of the mounting plate 8; it controls the extension / retraction of the electric push rod 9 to adjust the probe's lifting and lowering; and it controls the working time of the ultrasonic transmitter 14 to ensure cleaning effectiveness. Through the overall coordination of the controller 4, the components work together, automating the testing, cleaning, and wiping processes, thus improving the equipment's efficiency and testing accuracy.

[0017] It should be noted that the control circuit of controller 4 can be implemented by simple programming by those skilled in the art, and is common knowledge in the field. It is only used and not modified, so the control method and circuit connection will not be described in detail.

[0018] The working principle of the four-needle testing device for composite conductive paste provided by this utility model is as follows: Before testing, the placement tank 3 containing the composite conductive paste is placed into the device body 1, and an appropriate amount of cleaning fluid 13 is injected into the cleaning box 2. During testing, the controller 4 starts the stepper motor 5, which drives the lead screw 7 to rotate. Since the mounting plate 8 is screwed to the lead screw 7 through the threaded hole 10, the rotation of the lead screw 7 causes the mounting plate 8 to move horizontally until the four-pin test assembly 12 is precisely positioned above the placement tank 3. Subsequently, the controller 4 controls the electric push rod 9 to extend, and the output end of the electric push rod 9 pushes the mounting base 11 and the four-pin test assembly 12 to descend vertically, so that the probe contacts the composite conductive paste in the placement tank 3, completing the conductivity test. After the test is completed, the controller 4 controls the electric push rod 9 to retract, causing the probe to rise and detach from the slurry. Next, the stepper motor 5 drives the lead screw 7 to rotate, causing the mounting plate 8 to move the four-pin test assembly 12 directly above the cleaning box 2. At this time, the electric push rod 9 extends, immersing the probe in the cleaning solution 13 of the cleaning box 2. Simultaneously, the controller 4 activates the ultrasonic generator 14. The ultrasonic vibration is transmitted through the cleaning solution 13 to the probe surface and crevices, using high-frequency vibration to peel off and remove slurry residue (including stubborn residue in crevices) from the probe, achieving deep cleaning. After cleaning, the electric push rod 9 retracts, causing the probe to leave the cleaning solution 13. The stepper motor 5 continues to drive the mounting plate 8 to move, transferring the four-pin test assembly 12 directly above the mounting frame 15. Subsequently, the electric push rod 9 extends again, pushing the probe through the cross-shaped notch 17 on the surface of the wiping sponge 16 (the cross-shaped notch 17 corresponds one-to-one with the probe position to ensure a tight fit). The wiping sponge 16 absorbs the moisture and residual cleaning solution 13 from the probe surface through its own adsorption force, while further removing fine residue, completing the drying and secondary cleaning of the probe. The entire testing and cleaning process is automatically controlled by Controller 4 without human intervention, realizing full automation from testing to deep cleaning and drying, which not only ensures the thoroughness of probe cleaning, but also effectively improves testing efficiency and accuracy.

[0019] It should be noted that all components used in this application are standard parts that can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets and welding that are mature in the prior art. The mechanical parts and electrical equipment adopt conventional models in the prior art. The circuit connection adopts conventional connection methods in the prior art. The electrical equipment is connected to an external safe power source. These will not be described in detail here.

[0020] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

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