About us

Shenyang Longdy Electrical Equipment Co., Ltd. was established in 2003, is specialized in auxiliary switch research and development, manufacturing, set stroke switch, micro switch research and development and manufacturing, precision mold design and manufacturing, precision stamping parts, plastic parts processing in one of the high-tech research and development, production enterprises.

PURPOSETo comply with truth · To work with morality
VISIONBuild excellent enterprises, build a hundred billion business circle, and help the northeast economy
MISSIONTo create a rich and happy life for employees, at the same time, to contribute to the development of customers and society.
SENSE OF WORTHActively love life and work, to be rigorous, honest, grateful, humble and altruistic.
Mold workshop

Mold division has advanced processing equipment and testing equipment. There are more than 100 sets of processing equipment, such as vertical machining center, CNC lathes, high-precision wire cutting, EDM, engraving machine, milling machine, grinding machine, high-speed punching machine, etc. There are more than 30 sets of testing equipment, such as coordinate measuring instrument X fluorescence coating thickness tester, salt spray testing machine, simple beam impact testing machine, 1T plastic tensile testing machine, etc., which can ensure the production and processing cycle and quality control of molds and products...

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Injection molding workshop

Shenyang Qingji Precision Molding Co., Ltd. is an independent business division of Longdy Electrical Appliances, established in 2010, specializing in the design and manufacturing of injection molds, die casting molds, rubber molds, injection products, die casting products, rubber products, mechanical processing, hardware products, stamping products production and sales. Plant construction area of 4500 square meters, more than 30 employees. Over the years, Qingji Molding has been focusing on the design, development and production of plastic mold sales, adhere to the purpose of quality, long-term for Volkswagen, Shenyang Broad, Switzerland ABB, Astak, Jinbo Johnson, South Korea Aige machinery and other well-known brand manufacturers to provide supporting molds and products...

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Assembly shop

The company has product independent research and development, design, production capabilities. Has developed, produced and assembled 27 series of auxiliary switches (FK series, FH series, FH1 series, FR series, FR1 series, FC series, FB series, FA series, S100 series, CWA series, C2 series, LXB series, LZ series, LAA series, LFZ series, LFD series, LFE series, LFF series and LFG series, etc.), more than 400 specifications. All electrical products are produced according to the national low-voltage electrical standard GB/T14048.5-2008 (equivalent to IEC60947-5-1), and have passed the type test of the National Machinery Industry low-voltage explosion-proof electrical products quality supervision and testing center or Shanghai Electrical Equipment Testing Institute....

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Electroplating workshop

Electroplating processing and manufacturing Department general description: the existing four production lines, respectively, alkaline galvanizing line, acid galvanizing line, rolling tin line, non-cyanide rolling silver line, 3 management personnel, 2 technical personnel, 27 production...

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Machine shop

The machine workshop has 4 bench drills, 4 CNC cars, 1 machine walking machine, 2 general cars, can process all kinds of machine parts, professional skills are strong, can process scattered parts and batch parts....

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Press shop

Our stamping workshop has 6 equipment, 80T one, 45T one, 25T three, 16T one, 6.3 tons one, can guarantee the quality and quantity of electronic connectors...

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PRODUCT CENTER
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News Information
Wiring of High-Voltage Auxiliary Switches in Control Cabinets: Key Strategies for Accurately Avoiding “Parasitic Loops”

In high-voltage equipment operating systems, high-voltage auxiliary switches within control cabinets perform critical functions such as signal transmission and circuit control; the quality of their wiring directly determines the stability and safety of equipment operation. “Parasitic circuits,” however, represent a hidden hazard in the wiring process. Once formed, they can, at best, interfere with the equipment’s signal interpretation and, at worst, trigger equipment malfunctions, threatening the safety of power grid operations. Therefore, focusing on the wiring of high-voltage auxiliary switches within control cabinets and scientifically avoiding “parasitic circuits” is a core issue in ensuring reliable equipment operation.

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Waterproof and Dustproof Design of Electromechanical Micro Switches: Building a Solid Foundation for Stable Equipment Operation

With electric equipment now widely used in diverse scenarios such as industrial automation, outdoor operations, and smart homes, electromechanical microswitches—as key components for controlling circuit on/off states—directly determine the overall performance of the equipment through their operational stability. The waterproof and dustproof structural design of these microswitches is the core solution to the challenge of environmental degradation in complex conditions, serving as a critical technological foundation for ensuring reliable operation and extending the service life of the equipment.

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Selection Guide for IP Protection Ratings of Micro Switches in Hydraulic Systems: Building a Robust Protective Barrier for Stable Equipment Operation

In a system designed for the efficient operation of hydraulic equipment, micro switches for hydraulic mechanisms are core components that enable precise control and ensure the reliable start-up, shutdown, and signal transmission of the equipment; their performance stability directly determines the operational efficiency of the entire hydraulic system. Selecting the appropriate IP protection rating for these micro switches is a critical prerequisite for ensuring their long-term, reliable operation under complex working conditions. If the wrong rating is selected, the switch is highly susceptible to failure due to issues such as dust ingress or fluid corrosion. At best, this can lead to equipment control failure; at worst, it can cause system shutdown, resulting in severe losses to the company’s production. Therefore, mastering a scientific guide for selecting the appropriate IP protection rating for hydraulic micro-switches is an essential skill for every hydraulic equipment designer and maintenance technician.

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