Multi-hole Yoke Plates

 

Multi-hole yoke plates come in a wide variety of models and can be categorized in several ways from a manufacturing and design perspective, such as by the number of holes, shape, and material. Below, we will focus on commonly used yoke plates and provide a classification:
Classification by Number of Holes:Commonly used are 4-hole yoke plates, suitable for double insulator strings and double-split conductor connections, used in 330kV high-voltage transmission lines. 5-hole yoke plates typically have a triangular distribution and are used in substation equipment. Yoke plates with 8 or more holes can withstand a breaking load of up to 800kN, suitable for ultra-high-voltage scenarios.
Shape and Structure:Commonly used are triangular and rectangular structures. Triangular structures are suitable for angled connections at transmission line corners, while rectangular structures are more stable and distribute stress evenly, better adapting to power connection scenarios with different loads.
Material Classification:The mainstream materials are carbon steel and ductile iron, with hot-dip galvanized surfaces for wear resistance and moderate cost. Stainless steel is suitable for corrosive environments, resisting seawater salt spray corrosion and preventing strength degradation over long-term use.
Load Capacity:Multi-hole yoke plates are suitable for medium and low voltage loads. Plates are suitable for low-voltage lines, while heavy-duty yokes generally exceed 100kN, making them suitable for ultra-high-voltage lines. They can withstand strong conductor tension and heavy equipment loads.

In the entire production process of multi-hole yoke plates, the drilling process is the most crucial, directly determining the assembly accuracy, load transfer efficiency, and stability. During production, it is essential to select appropriate processing equipment and process parameters based on material properties and hole accuracy requirements. Strict control must be exercised over key indicators such as hole dimensions, perpendicularity, and surface roughness to ensure compliance. Below, we will discuss this in detail:

Preparation: Based on the drawings, clarify the hole position parameters, including hole diameter, hole spacing tolerance, hole perpendicularity, surface roughness, etc. Select a dedicated fixture to ensure no workpiece displacement during machining, with a positioning accuracy ≤ ±0.05mm;
Drilling: For holes with a diameter > 10mm or high-precision holes, reduce the cutting resistance of direct machining with large-diameter drills to reduce tool wear. For thick plates, guide holes can effectively disperse cutting heat and prevent workpiece deformation;
Finishing: Use a machine reamer, controlling the reaming allowance to 0.1-0.2mm, cutting speed ≤ 10m/min, feed rate 0.2-0.3mm/r. Correct the dimensional errors after drilling through reaming, reducing the surface roughness to Ra ≤ 1.6μm;
Hole treatment: Use a chamfering tool with a chamfer size of 0.5×45°-1×45° to remove burrs and sharp edges from the hole opening, preventing scratches on fasteners and insulator fittings during assembly, and preventing stress concentration.

The manufacturing process of Multi-hole Yoke Plates is very important. We strictly implement every step of the production process to ensure that the quality of the products meets the standards, and any products that do not meet the quality standards will not leave the factory.