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How to connect screw terminals

1. Screw connection

Screw connection adopts a screw type terminal block connection method, paying attention to the maximum and minimum cross-sectional area of the allowed connecting wires and the maximum tightening torque allowed for screws of different specifications.

2. Welding

The most common type of welding is soldering. The most important aspect of tin welding connection is to form a metal continuity between the solder and the surface being welded. Therefore, for cold pressed terminals, solderability is important. The most common coatings for the welding end of the wiring ring terminal are tin alloy, silver, and gold. The common welding ends for spring type contact include welding plate type, punching welding plate type, and notch welding plate type: the needle hole type contact has drilling arc notch type for common welding ends.

3. Crimping

Crimping is a technique used to compress and displace metal within specified limits and connect wires to contact pairs. A good crimping connection can generate metal fusion flow, causing symmetrical deformation of the wire and contact material. This type of connection is similar to a cold welding connection, which can achieve good mechanical strength and electrical continuity, and can withstand more harsh environmental conditions. It is generally believed that using the correct crimping connection is better than soldering, especially in high current situations where crimping must be used. Special crimping pliers or automatic or semi-automatic crimping machines must be used during crimping. The correct selection of the contact wire barrel should be based on the cross-section of the cold pressed end wire. It should be noted that crimping connections are permanent connections and can only be used once.

4. Winding connection

Wrapping is the process of directly wrapping a wire around a contact post with sharp edges. When winding, the wire is wound under tension control, pressed and fixed at the edges of the contact wire winding column to form an airtight contact. There are several requirements for wire winding: the nominal diameter of the wire should be within the range of 0.25mm to 1.0mm; When the diameter of the wire is not greater than 0.5mm, the copyright of the control engineering network is reserved, and the elongation of the conductor material is not less than 15%; When the diameter of the wire is greater than 0.5mm, the copyright of the control engineering network is reserved, and the elongation of the conductor material is not less than 20%. The tools for winding include a winding gun and a fixed winding machine.

5. Pierce one after another

Piercing connection, also known as insulation displacement connection, is a novel end technology invented by the United States in the 1960s. It has the characteristics of high reliability, low cost, and convenient use. It has been widely used in various printed circuit board wiring terminals, cold pressed terminals, and circular ring terminals. It is suitable for connecting ribbon cables. When connecting, it is not necessary to peel off the insulation layer of the cable. By relying on the U-shaped contact spring of the wiring terminal to pierce the tip of the insulation layer, the cable conductor slides into the groove of the contact spring and is clamped. All rights reserved by the control engineering network, this creates a tight electrical connection between the cable conductor and the wiring terminal spring. It only requires simple tools, but cables with specified wire specifications must be selected.