Active Member
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[China]
Address: Economic Development Area, XinXiang city, Henan province, China.
Contact name:June Chao
Henan Dowell Crane Co., Ltd. |
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300 Ton Mobile Double Girder Truss Gantry Crane With Electric Trolley
Product Description
300 Ton Mobile Double Girder Truss Gantry Crane With Electric Trolley is a variant of the gantry crane . Mainly used for outdoor cargo yard, yard goods, bulk cargo loading and unloading operations. Its metal structure shaped like a door frame, carrying the main beam install two feet down, you can walk directly to the track on the ground, both ends of the main beam may have overhanging cantilever. 300 Ton Mobile Double Girder Truss Gantry Crane with a high utilization of space, large operating range, wide adaptation, versatility, etc., are widely used in the port yard.
Product Advantages
Product Characteristics
Although the 300 Ton Mobile Double Girder Truss Gantry Crane is also a gantry crane, but it has a great defense in the structure, which also makes the gantry crane bearing capacity is stronger, and has a higher work efficiency in use. Focus on understanding the lifting mechanism of gantry crane.
As an important part of the frame door, the lifting mechanism is mainly composed of a large torque bi-directional hydraulic motor and a winch, which is driven by a motor to lift or lower the weight of the winch. Because the speed of the hydraulic motor can be adjusted by changing the speed of the engine, the lifting hydraulic circuit of the gantry crane is a balance circuit, and the balance valve is composed of the external control sequence valve and one-way valve after the improved design.
It is because the truss frame gantry crane used the balance valve, so the weight will not fall when fast stop phenomenon, when the reverse valve spool to the right position, the pressure oil through the balance valve one-way valve into the hydraulic motor, lifting the weight; When the reversing valve spool to the left, the pressure oil directly into the hydraulic motor; The balance valve opens, the oil return chamber of the hydraulic motor passes through the balance valve, and the weight falls steadily.
When the reversing valve in the gantry crane changes back to the middle position, the balance valve closes, the hydraulic motor stops running and the weight stops in the air. But because the hydraulic motor leakage is much larger than the hydraulic cylinder, although the balance valve sealing is good, the weight in the air still has the phenomenon of slipping.
In order to avoid the occurrence of similar phenomenon, the truss-frame gantry crane is equipped with a brake cylinder on the hydraulic motor. When the reversing valve spool is changed back to the middle position to make the hydraulic motor stop rotating, the oil in the brake cylinder has a rod cavity to return oil through the one-way valve of the throttle valve, which makes the hydraulic motor brake quickly and the weight stop falling quickly.
When the reversing valve spool is changed to the right position and the weight rises, the pressure oil flows slowly into the bar cavity of the brake cylinder after passing through the throttle valve of the throttle valve, which makes the brake cylinder loosen slowly, so as to avoid the sliding of the weight in the gantry crane of the flower-frame due to its weight.
Parts Of Crane
