Overhead Crane Specifications

Performance Parameters of Crane Lifting Machinery

The main performance parameters of hoisting crane machinery include lifting capacity, working class, lifting torque, lifting height and working speed.

Overhead Crane Capacity

Weight refers to the quality of the crane can lift a weight, which should include the quality of sling and iron pole or a container, it is an important parameter to measure the crane working ability.It is usually called the rated weight and is expressed as “Q”.The weight – starting unit used to be used as “t” and now is represented by “kN” (10kN is approximately equal to 1t).

QZ 20 ton overhead crane with grab for sale
QZ 20 ton overhead crane with grab for sale

 

With the change of the working range of the crane, the crane’s weight also changes.Therefore, the rated weight has the maximum weight and maximum lifting weight.The maximum weight refers to the basic boom in maximum weight lifting allowed minimum amplitude; the biggest weight refers to the basic boom in the maximum weight lifting maximum amplitude at.General crane rated lifting weight refers to the basic boom in maximum weight lifting allowed minimum amplitude when the crane is calibrated on the nameplate capacity.

Working Class

The working range refers to the horizontal distance between the central axis of a crane and the center line of a hook under the rated load. It is usually referred to as the radius of gyration or the radius of work. It is represented by “R”, and the unit is “m”.The working range indicates the working range of the crane when it does not shift. It includes two parameters, the maximum amplitude, and the minimum amplitude.For the pitching amplitude boom, when in a horizontal angle close to the level of 13 degrees, the maximum horizontal distance from the center to the center of the hook crane slewing axis line, the biggest; when the boom up to the maximum angle (the average angle of 78 degrees), the rotary center axis to hook the distance of the center line of the minimum. Minimum amplitude.The trolley jib, when small cars to the arm head end position, the biggest; when the car is boom root end position, minimum amplitude.

Single Girder eot crane design
Single Girder eot crane design

The lifting weight of the crane varies with the amplitude, and the same crane has different ranges and its weight is different.For a wheeled crane with leg support, it should also be expressed in the effective range of A, that is, the horizontal distance from the center of the hook to the center line of the side leg when the leg is working laterally.The effective range reflects the actual working ability of the crane. The working range is expressed by A1 (single tire) or A2 (A2 twin) without using outrigger to work laterally.

Lifting Torque

The lifting moment is the product of the crane’s lifting weight and the corresponding amplitude.The unit of lifting torque used to be expressed by t*m. Now it is expressed by kN*m. It is a crane’s comprehensive lifting capacity parameter, which can comprehensively and accurately reflect crane’s lifting capacity. The tower crane needs to work in a large range, so the lifting torque is used as the main parameter to express the model.The lifting torque of a tower crane usually refers to the lifting moment of the maximum amplitude.

80t bridge crane for sale

Crane’s hoisting characteristic curve is a curve showing the relationship between crane’s weight and amplitude. Different amplitude has different rated weight. It can connect different amplitudes and corresponding rated lifting weights to line, and it can be drawn into hoisting characteristic curve.All the cranes have this curve near the control table so that the operator can quickly find out the maximum lifting weight of the crane at a certain extent.To be equipped with several different arm length of the crane, each of which corresponds to the length of the jib crane has its characteristic curve.

Overhead Crane Lifting Height

The lifting height refers to the distance from the ground to the hook and the center of the hook, and the calibration value of its parameters is usually expressed as the rated lifting height.The rated lifting height refers to the rise of the hook to the maximum limit of the full load, from the center of the hook to the ground.When the hook needs to be lifted below the ground, the depth of the ground below the ground is called the lower depth, and the total lifting height is the sum of the lifting height and the lower depth.

For the jib crane, when the boom length, lifting height increases with the magnitude of the reduction, this feature can be used to lift height curve representation, and its corresponding lifting performance curve.

Overhead Crane Working Speed

The working speed of the crane includes the speed of lifting, amplitude changing, turning and walking.The rise and rise speed of the lifting speed refer to the rising or falling speed of the lifting hook, and the unit is “m/min”.The lifting speed of the crane is related to the lifting speed of the hoisting mechanism, and it is related to the ratio of the hook pulley group.The rope is twice as fast as the rope; the single rope is twice as fast as the double rope.Generally, the lifting speed parameter should be indicated, and the number of rope should be marked.

Amplitude variable amplitude speed is the average line speed of the hook from the maximum to the minimum, and the unit is “m/min”.The pitching amplitude is the amplitude speed up boom boom rising and falling speed, generally falls faster than the arm lifting arm speed.

The rotation speed of the rotary speed refers to the number of revolutions per minute of the crane in the case of no load, and the unit is “r/min”.

Walking speed is the maximum speed of a crane when it is not loaded, and the unit is “m/min”.Walking speed is the maximum speed of a crane when it is not loaded, and the unit is “m/min”. Any need for the crane specification and costs, be free to contact us.