Crane Development origin: history. In the late 18th century, 25 t crane manufacturer, British watt improvement and invention of the steam engine after 25 tons crane manufacturers, provided the impetus for the lifting machinery condition. 1805, London Lennie Grand engineers built the first steam dock overweight machine. 1846 25 t crane, British Armstrong to Newcastle dock a steam haulers instead of hydraulic cranes. Crane safety devices: leg locking mechanism. When the mishap occurred, leading to the legs vertical cylinder high-pressure hose or pipeline rupture or cutting Guangdong 25 tons cranes, hydraulic system, two-way hydraulic lock cylinder block can block two outrigger pressure oil chamber to make the legs Notations or thrown, to ensure the safety of lifting operations. 25 t crane manufacturers _ Yongchang Machinery (certified) _25-ton crane provided by the Henan Yongchang Engineering Machinery Co., Henan Yongchang Engineering Machinery Co., Ltd. (www.tadanocrane.net) is Anyang, other leaders, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Yongchang machinery leadership with the staff warmly welcome all inquiries negotiations to create a better future Yongchang machinery.