In various electrical equipment and electronic devices, the secure connection of wires and clamps is crucial for ensuring the reliability and safety of the system. Pull-out force testing determines the performance of wire and clamp connections under stress, thereby determining their durability and stability in practical applications.

This test is typically performed using a pulling testing machine. By applying gradually increasing tensile force until the wire or clamp detaches, the connection strength and destructive force are assessed. Test results can help engineers optimize designs, improve material selection, and installation processes, thereby enhancing the overall system performance and safety.

Detailed Working Principle: Force Application and Measurement

When the test begins, the loading system activates, converting power into tensile force on the sample via a transmission mechanism.

Force sensors (such as strain gauge sensors) respond to changes in force on the sample, generating electrical signals. These signals are amplified and processed by a data processing system to convert them into readable force values.

Strain gauges convert external force into electrical signals through the minute deformation of elastic elements, achieving precise force measurement using the bridge circuit principle.

Deformation Tracking

Displacement sensors record the displacement of the sample during the stress process, providing elongation data.

Extensometers are particularly important in high-precision testing, as they can accurately measure minute changes in a specimen and are suitable for different types of specimens and gauge lengths.

Data Processing and Analysis: The control system integrates force and displacement data, displaying it in real time on a monitor to generate tensile curves.

By analyzing these curves, important parameters of the material, such as yield point, fracture strength, and elastic modulus, can be determined.

Operating Instructions

1. Preparation Stage: First, check that all components of the tensile testing machine are intact, such as the clamps, sensors, and control system, ensuring the equipment is in good working order. Next, select the appropriate clamps according to the properties of the material to be tested and the testing standards, and correctly install them on the testing machine.

2. Sample Clamping: Securely clamp both ends of the sample to be tested in the upper and lower clamps of the testing machine. Ensure the sample is centered to avoid eccentric loading affecting the test results. Adjust the clamp position to ensure the sample will not slip or break inside the clamps during the test.

3. Parameter Setting: Set the required parameters for the test, such as tensile speed, force range, and data recording frequency, through the control panel or software interface of the testing machine. These parameter settings should strictly adhere to relevant standards or customer requirements.

4. Starting the Test: After confirming all settings are correct, start the testing machine to perform the tensile test. During the test, carefully observe the changes in the sample, especially near the fracture point. Pay attention to changes in the force curve to capture key data promptly.

5. Data Processing: After the test, the testing machine will automatically or according to instructions record and process the data, generating force-displacement, force-time, and other graphs. Users need to carefully analyze this data to evaluate the mechanical properties of the material, such as tensile strength and yield strength.

6. Cleaning and Maintenance: After the test, promptly clean any residue from the testing machine and fixtures to keep the equipment clean. Simultaneously, perform necessary maintenance, such as lubricating moving parts and checking sensor accuracy, to extend the equipment's service life.

Tensile Testing Machine Applications and Importance

Tensile testing machines are widely used in metals, plastics, textiles, paper, and other fields. They are indispensable for quality control and are also key tools for new material research and development. They help engineers and researchers understand the mechanical behavior of materials, optimize product design, and ensure product quality, thereby driving industrial and technological progress.

Daily Maintenance

How do we maintain and care for a tensile testing machine during daily use? First, it's important to know that if testing is not performed for an extended period, the power should be switched off. If the machine is in standby mode, the selector switch should be set to the "load" position. If the selector switch is set to the "fast return" position, the solenoid valve will remain energized, affecting its lifespan.

Regularly replace the oil suction filter element and hydraulic oil according to the machine's usage and the oil's lifespan. Regularly check the main unit and oil source for leaks. If leaks are found, replace the seals or replace the heat exchanger assembly immediately.

Control system maintenance is equally important. It's crucial to know that the controller power must be switched off before plugging or unplugging any interfaces. The controller interfaces are one-to-one; plugging in the wrong interface may damage the equipment. After testing, if the machine will not be used for an extended period, turn off the controller and computer. Regularly check the connection cables on the back panel of the controller for good contact; tighten any loose connections immediately. When maintaining the main unit, regularly check the sprocket transmission and the screws in the jaws; tighten any loose screws immediately. Keep the sliding surfaces where the steel plate contacts the liner plate, and the dovetail surfaces on the liner plate, clean.

All parts of the tensile testing machine should be wiped clean frequently. For unpainted parts, after cleaning, wipe again with cotton yarn dampened with a small amount of machine oil to prevent rust. Pay extra attention to wiping during the rainy season. When not in use, cover with a dust cover to prevent dust intrusion.

After each test, lower the test platform, ideally leaving a slight gap so the piston does not fall to the bottom of the oil cylinder for the next use. Do not leave any valves on the force gauge open to prevent dust from entering and affecting the sensitivity of the measuring mechanism. Turn off the oil pump motor when pausing the test.

Application Areas

As a precision mechanical testing device, the snap-fit tensile testing machine quantitatively evaluates the tensile strength, insertion and extraction force, and other key performance characteristics of snap-fit components by simulating real-world stress scenarios. Its applications are widely used across multiple industries, providing crucial assurance for product quality and safety.

In the apparel and textile industry, snap-fit tensile testing machines are a core tool for ensuring the safety of children's and adult clothing. For example, buttons, decorative parts, and other accessories on infant and toddler clothing must undergo rigorous testing to ensure they do not detach under external pulling forces (such as when grasped or accidentally snagged by a child), preventing the risk of accidental ingestion.

In the electronics and electrical appliance industry, snap-fit tensile testing machines are a critical link in the quality control of connectors, housing snaps, and other components. For example, charging port snaps in devices such as mobile phones and tablets need to withstand frequent insertion and removal; insufficient tensile strength may lead to poor contact or damage. Housing snaps in industrial equipment need to remain stable under vibration or impact environments to prevent internal components from being exposed.

The automotive manufacturing industry also has an urgent need for snap-fit tensile testing. Interior components in vehicles (such as dashboards and seat buckles) and seatbelt buckles must undergo rigorous testing to ensure they do not accidentally dislodge during a collision or emergency braking. For example, seatbelt buckles must withstand thousands of insertion and removal cycles, with each insertion and removal force meeting design standards to ensure passenger safety.

The packaging industry relies on buckle tensile testing machines to verify the sealing and opening force of packaging containers. For example, easy-tear openings on food packaging and tamper-evident rings on medicine bottle caps must balance sealing and ease of use: an overly tight seal may make it difficult for consumers to open, while an overly loose seal may cause leakage or contamination.

Furthermore, buckle tensile testing machines play a crucial role in medical device and toy manufacturing. For example, the connecting buckles of surgical instruments must ensure they do not loosen during surgery; toy assembly parts must prevent children from accidentally disassembling them and causing small parts to fall off. Through testing, companies can identify potential risks in advance and avoid safety accidents or recalls caused by buckle failure.

Buckle tensile testing machines, with their precise testing capabilities and wide range of applications, have become indispensable quality control tools in modern industry. From ensuring the safety of children's clothing to optimizing the reliability of electronic device connections, from improving automotive safety performance to perfecting medical device design, their value permeates every stage of the product's entire lifecycle. With continuous innovation in materials science and manufacturing processes, buckle tensile testing machines not only need to meet higher precision testing requirements but also adapt to complex and ever-changing testing environments. In the future, with the deep integration of intelligent and automated technologies, these devices will further drive various industries towards greater safety, reliability, and efficiency, building a solid technological defense for global industrial upgrading and consumer safety.