We are one of the largest and most professional crane manufacturers in China, with total sales of more than 1.6 billion US dollars last year, including sales of 11,000 sets of double-beam and gantry cranes, more than 73,000 sets of single-beam cranes, and more than 100,000 sets of electric hoist and accessories.
We have an advanced, green, whole-industry chain, intelligent manufacturing industrial park, with an investment of 370 million US dollars and more than 4,700 employees, which has been established for more than 20 years.
The structures of crawler cranes are basically the same, all consisting of power units, working devices, slewing devices, traveling systems, transmission systems and safety devices, etc. one 1. Boom
Crawler cranes all adopt truss-type booms, which are steel structures used to support the hoisting wire ropes and pulley blocks. They can be pitched to change the working radius of the crane and are directly hinged to the upper rotating platform. The upper and lower sections of the boom are the basic booms, and there are multiple standard booms. According to the construction needs, the basic boom can be extended, and if necessary, a secondary boom can be installed at the top of the main boom to expand the working range. For example, the basic boom length of the QUY50 crane is 13m, and it can reach 52m after adding sections. In the early days, most sections of the boom were connected by flange bolts, and most used pin shaft connections, which were suitable for truss booms made of seamless steel pipes. The cross-section of the boom is rectangular, providing good lateral stability.
2. Hoisting mechanism
The hoisting mechanism of mechanical cranes is driven by the main transmission device through a belt clutch to rotate the hoisting drum. The hoisting wire rope on the drum is wound or unwound by the forward and reverse rotation of the drum, causing the hook to rise or fall. In hydraulic cranes, the hoisting drum is driven by a hydraulic motor through a pair of reduction gears.
3. Luffing mechanism
The luffing mechanism of crawler cranes is operated by the luffing drum, which winds or unwinds the luffing wire rope. Through the double-pulley block fixed on the double-foot bracket and the luffing rope fixed at one end to the pulley block and the other end to the top pulley shaft of the boom, the boom can be raised or lowered. In mechanical cranes, the luffing drum is driven by the main transmission device through a worm gear reducer. In hydraulic cranes, the luffing drum is driven by a hydraulic motor through a reduction gear.
4. Rotating device
(1) Rotating platform The rotating platform, also known as the upper frame, is the foundation for installing and connecting the power unit and various working devices. The front part of the platform is equipped with the boom and control system, the middle and rear parts are equipped with the diesel engine and the double-foot bracket for fixing the luffing mechanism, and the lower surface is equipped with the upper seat ring of the rotating support device. The rear part is equipped with counterweight boxes (blocks).
(2) Rotating support The rotating support not only completes the rotating operation but also transmits the various loads on the upper part to the lower support frame. When the rotating platform rotates, it maintains the balance of the crane body.
(3) Rotating mechanism In mechanical cranes, the rotating mechanism is driven by the cylindrical gear at the lower end of the vertical shaft of the main transmission device engaging with the rotating transmission gear, and through the clutch, it drives the rotating pinion to rotate along the rotating gear, causing the rotating platform to rotate. In hydraulic cranes, the rotating mechanism is driven by a hydraulic motor through a set of reduction gears to drive the rotating pinion, achieving the rotation of the crane body.
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