(1) single girder and double girder gantry crane selection
Under normal circumstances, from the weight of 50t below the span of 35m or less, no special use requirements, should use a single main beam type. If the requirements of the door width, work speed is high, or often lifting heavy pieces, long pieces, you should choose double beam gantry crane.
(2) span and cantilever length
The span of RMG-Gantry Crane is an important factor affecting the quality of the crane itself. In the selection, the span should be minimized, subject to the conditions of use of the equipment and compliance with the span series.
(3) the principle of determining the track
(A) to meet the stability requirements of the gantry along the direction of the crane track;
(B) the outer dimensions of the cargo shall pass smoothly through the outrigger steel frame;
(C) Note that the track B and span S into a certain proportion of the relationship between the general take the track B = (1 / 4-1 / 6) S.
(4) gantry crane spacing size to determine
In the work, the external dimensions of the gantry crane and the yard of goods and transport vehicles between the channel should be left to a certain size, in order to facilitate loading and unloading operations. General transport vehicles in the span of loading and unloading, should be maintained with the door legs are more than 0.7m spacing. Spreader should not work with the transport vehicles should be more than 0.5m spacing,RMG-Gantry Crane the goods through the door when the legs should be more than 0.5m spacing.
(5) gantry crane electrical equipment selection
In order to ensure safe and reliable lifting operation, the crane is equipped with a better safety device, so that in the case of accidents, to protect the machine or to remind the operator to pay attention to play a security role.
1. The hydraulic system of the relief valve: can inhibit the abnormal high voltage in the circuit to prevent damage to the hydraulic pump and motor, and to prevent the overload state.
2. Suspension swing safety device: When the accident occurred, the boom swing cylinder circuit in the high-pressure hose or tubing burst or cut off, the hydraulic circuit in the balance valve to play a role in locking from the cylinder chamber Oil, so that the boom does not fall, so as to ensure the safety of operations.
3. boom expansion and contraction device: when the accident occurred, the boom telescopic cylinder circuit in the high-pressure hose or tubing burst or cut off,RMG-Gantry Crane the hydraulic circuit in the balance valve on the role of locking from the lower chamber of the working oil, So that the crane itself will be retracted to ensure the safety of the operation.
4. height limit device: hook up to the specified height, the touch limit hammer, open the trip switch, "over the" indicator light that is lit, while cutting off the hook lift, boom out, hanging Arm to the operation of the operation to ensure safety. At this time as long as the manipulation of the hook down, the arm retracted or the arm up (that is, to the safe side of the operation) and other handles, so that the limit hammer to lift constraints, the operation is back to normal. In special cases, such as the need for a small over-winding operation, you can press the release button on the instrument box, then the role of the limit will be lifted, but this time the operation must be very careful to prevent accidents.
5. Leg locking device: When the accident occurred, leading to the vertical cylinder of the high pressure hose or tubing rupture or cutting, the hydraulic system in the two-way hydraulic lock can block the lock cylinder oil pressure chamber, the support Legs do not shrink or throw, so as to ensure the safety of lifting operations.
6. Weight indicator: The weight indicator is set on the side of the base arm (ie, the right side of the control chamber). The operator can be clearly observed in the control room and can accurately indicate the boom Elevation and the rated lifting capacity of the crane under the corresponding operating conditions.
7. Lifting characteristics table: set in the control room on the front side of the wall board, the table lists a variety of arm length and a variety of working range under the rated lifting capacity and lifting height for inspection when operating. RMG-Gantry Crane Lifting operations must not exceed the values specified in the table. In order to ensure safe and reliable lifting operation, the crane is equipped with a better safety device, so that in the case of accidents, to protect the machine or to remind the operator to pay attention to play a security role.