L48A1 Mast Section Detailed solution to single beam Crane, single beam crane structure, steel structure, mechanical system characteristics
Composition of a single beam crane
Electric single beam crane mainly includes three main operating mechanisms: lifting operation mechanism, large car operation mechanism, and small car operation mechanism. Among them, the lifting operation mechanism is mainly composed of electric Gourd, wire rope, pulley, hook or crane. The metal structure of the electric single-beam bridge crane is mainly composed of two parts: the main beam and the end beam. The main beam structure is mostly the combined section of the I-steel and steel plates. It consists of the cover plate, the ventral plate and the I-steel steel. There are also vertical and horizontal reinforcement in the box. Its safety and reliability directly affect the operation quality and working ability of the crane.
Two steel structure production characteristics
1 The main steel structure(main beam, end beam) materials are Q235-B, the materials used have material report and corresponding certificate of conformity.
2 The manufacture, welding and inspection of steel structures are carried out according to national standards. The welding process of the double side slope is adopted for the important force butt weld, and the appearance inspection and non-destructive inspection are carried out according to regulations. All welders hold corresponding grade certificates.
3 All crane main beam adopts the whole plate without docking technology, cancels the main beam steel plate butt weld, eliminates the hidden danger of the steel plate butt welding volume. (Steel plate butt welding is the most important welding, is the most dangerous part of the quality)
4 All plates are automatically discharged by a CNC cutter, preset the arch degree of the main beam, avoiding the problem of traditional fire bending the arch degree of the main beam.
5 Steel surface throwing treatment, its surface roughness hit GB8923 "before painting steel surface treatment registration and rust removal level" in the Sa 2.5, improve paint adhesion, do not strip paint, ensure the long-term beauty of the single beam crane
6 The longitudinal waist weld of the main beam adopts domestic advanced automatic aircraft ambush welding, which is beautifully formed and ensures the welding quality.
7 Large car crossbeams are made of rectangular tubes, no splicing, no weld, beautiful appearance, strong and durable.
8 Wheel installation all use boring type installation, to avoid the wheel tread is not in the same level, improve the wheel operation accuracy.
Performance characteristics of three mechanical systems
1 Single beam crane lifting mechanism consists of Sino-foreign joint venture brand Kaicheng two-speed electric Gourd, this product has the advantages of compact structure, light weight, small volume, easy operation and so on.
A. Speed reducer: The single-beam crane's electric Gourd reducer adopts a three-stage gear deceleration. The gears and gear shafts are all made of 40Cr or 20CrMnti steel forging, and after heat treatment, all are supported by rolling bearings. The box shell is made of cast iron, and the assembly is tight and the dust protection is reliable.
B. Roller device: the reel is made of cast iron or seamless steel pipe, with spline connection to the reducer, and the other end is supported by a rolling bearing at the protruding part of the front end of the conical motor. The shell of the reel is made of steel plate.
C. hook device: the hook is made of 20 steel die forging, and the thrust ball bearing is connected to the shell through the hook beam to make the hook function.
D. couplers: the torque of an electric motor, transmitted to the reducer through a clawed elastic coupling, which absorbs load shocks to achieve a smooth start.
E. Slow drive device: The slow drive device consists of a drive box, a box cover, and a small motor. The small motor drives the main motor through a slow device.
F. Limitator: In order to prevent the failure caused by the rise of the hook over the limit position, a limiter is installed on the Gourd. When the hook reaches the limit position, the lead rope guide on the reel device of the single-beam crane drives the limiter action. This automatically cuts off the power to stop the Gourd from operating.
G. Motor: The lifting motor adopts a conical brake motor with a larger power moment to adapt to the frequent direct start of the product during intermittent work. The maximum torque is 2.4 to 3 times the amount of fixed torque.
H. All electric gourds are equipped with weight limiters to ensure their use is safe and reliable.
I. Electronic control system: mainly composed of single-beam crane control box and operation button box, with loss of pressure, interlocking, overload, overload alarm and other protection or warning functions.
2 car running mechanism
The running mechanism of the single-beam crane electric Gourd is electric car type. The deceleration gear is 40Cr forged, and is adjusted and processed. It is installed in a closed deceleration box. All rolling bearings are used for support. The wall plate is made of steel plates to ensure flexible operation, convenient use, and long life. The car running mechanism is equipped with an inverter, which has no pole speed adjustment, stable operation, accurate positioning, and comfortable operation.
3 large vehicle operating mechanism
The large car operation structure of a single-beam crane consists of a motor, a reducer, and a wheel group. The wheel is a 45-# forging piece. The heat treated hardness is a tread HB ≥ 330 ~ 390, and the HB ≥ 260 at a depth of 20mm. The shaft and gear are made of a tempered 45 # or 40Cr. The large car drive is a new LDA type drive device. The device has the advantages of simple structure, small volume, large starting torque, frequent start, smooth running speed, low noise, safe and reliable use, convenient installation and maintenance, and beautiful.
The large vehicle running mechanism of the single-beam crane is equipped with a frequency converter, which has no pole speed adjustment, stable operation, accurate positioning, and comfortable operation.
