5 Technical Parameters For Buying A Crane

5 Technical Parameters For Buying A Crane
 

The main parameters of the 15 ton gantry crane/overhead crane are the parameters that characterize the main technical performance indicators of the crane, and are the basis for the design of the crane, and also an important basis for the safety technical requirements of the crane.
 

Lifting capacity G
 

Lifting capacity refers to the mass of the heavy object being lifted, in kg or t. It can be divided into rated lifting capacity, maximum lifting capacity, total lifting capacity, effective lifting capacity, etc.
 

1. Rated lifting capacity Gn
 

The rated lifting capacity is the sum of the materials that the crane can lift together with the mass of the separable spreader or accessories (such as grab bucket, electromagnetic sucker, balance beam, etc.).
 

2. Total weight Gz
 

The total lifting capacity is the sum of the mass of the material that the crane can lift together with the separable spreader and the spreader and drama fixed on the crane for a long time (including hook, pulley block, lifting wire rope and other lifting objects under the lifting trolley) .
 

3. Effective lifting capacity Gp
 

The effective lifting capacity is the net mass of the material that the crane can lift.
 

This parameter needs to be explained as follows:
 

① The lifting capacity marked on the crane signboard usually refers to the rated lifting capacity of the crane, which should be prominently displayed on an obvious position of the crane structure.
 

② For jib type cranes, the rated lifting capacity varies with the amplitude, and its lifting characteristic index is characterized by lifting torque. The value marked on the label is the maximum lifting capacity.
 

③ For cranes with detachable lifting gear (such as grab bucket, electromagnetic sucker, balance beam, etc.), the total rated lifting capacity of the lifting gear and material quality, and the allowed lifting material quality is the effective lifting capacity.
 

 

Lifting height H
 

The lifting height refers to the vertical distance from the top surface (or ground) of the crane running track to the upper limit position of the pick-up device, and the unit is m. Usually, when using a hook, it is counted to the center of the hook ring; when using a grab bucket and other containers, it is counted to the bottom of the container.
 

1. Descent depth h
 

When the pick-up device can be placed below the ground or the top surface of the track, its lowering distance is called the descending depth. That is, the vertical distance between the lowest working position of the spreader and the horizontal support surface of the crane.
 

2. Lifting range D
 

The lifting range is the sum of the lifting height and the lowering depth, that is, the vertical distance between the highest and lowest working positions of the spreader.
 

Span S
 

Span refers to the horizontal distance between the centerlines of the running track of the 15 ton bridge type crane, and the unit is m.
 

The distance between the centerlines of the trolley running track of the bridge type crane is called the gauge of the trolley.
 

The distance between the centerlines of the running tracks of the jib cranes running on the ground is called the gauge of the crane.
 

Amplitude L
 

The amplitude of a rotating jib crane refers to the horizontal distance between the center line of rotation and the plumb line of the pick-up device, in m. The amplitude of a jib crane of the non-rotating type refers to the horizontal, horizontal distance between the centerline of the spreader and the rear axle of the jib or other typical axis.
 

When the inclination angle of the jib is the smallest or the distance between the position of the trolley and the center of rotation of the crane is the largest, the amplitude is the maximum amplitude; otherwise, it is the minimum amplitude.
 

 

Working speed V
 

The working speed refers to the speed at which the working mechanism of the crane operates stably under the rated load.
 

1. Lifting speed Vq
 

The lifting speed refers to the vertical displacement speed of the rated load of the crane under the stable operation state, and the unit is m/min.
 

2. Cart running speed Vk
 

The running speed of the crane refers to the running speed of the crane with rated load on the horizontal road or track, and the unit is m/min.
 

3. Car running speed Vt
 

The running speed of the trolley refers to the running speed of the trolley on the horizontal track with a rated load under the steady state of motion, and the unit is m/min.
 

4. Luffing speed V1
 

The luffing speed refers to the average linear velocity of the horizontal displacement from the maximum amplitude to the minimum amplitude when the minimum rated load is suspended in the luffing plane in a stable motion state, and the unit is m/min.
 

5. Walking speed V
 

Walking speed refers to the smooth running speed of the mobile crane hanging the rated load under the condition of road driving, the unit is km/ho
 

6. Rotation speed ω
 

The rotation speed refers to the rotation speed of the crane around its rotation center under the steady motion state, and the unit is r/min.