With the needs of the market and construction machinery, today, the development and use of cranes in the market is becoming more and more extensive. So, do you know its code name and performance parameters? The following editor will share with you.
1. The code name of the crane
The four main element characteristics of code, rated starting quality, span and working level are used to represent the model of gantry crane.
M: indicates the gantry type, the next symbol after M is the double beam gantry crane. The symbols are: MG, ME, MZ, MC, MP, MS, plus two symbols for a single main beam gantry crane, the symbols are: MDG, MDE, MDZ, MDN, MDP, MDS.
MG—Double beam single trolley hook gantry crane
ME—Double beam double trolley gantry crane
MDN—Single main beam single trolley grab gantry crane
MDS—Single main beam trolley three-purpose gantry crane.
Second, the performance parameters of the crane
Main performance parameters of cranes:
The main parameters of the crane are the parameters that characterize the main technical performance indexes of the crane, are the basis for the design of the crane, and are also an important basis for the technical requirements of the safety of the heavy machine.
Lifting weight G
Lifting weight refers to the mass of the lifted weight in kg or t. Can be divided into rated lifting capacity, maximum lifting capacity, total lifting capacity, effective lifting capacity, etc.
1. Rated lifting weight Gn
The rated lifting weight is the sum of the materials that can be lifted by the crane together with separable spreaders or attachments (such as grabs, electromagnetic suction cups, balance beams, etc.).
2. Total lifting weight Gz
The total lifting weight is the sum of the materials that can be lifted by the crane, together with the spreadable spreaders and the spreaders and play fixed on the crane for a long time (including hooks, pulley blocks, lifting wire ropes and other lifting objects below the lifting trolley) .
3. Effective lifting weight Gp
The effective lifting weight is the net mass of the material that the crane can lift.
This parameter needs to be explained as follows:
First, the lifting capacity marked on the crane's nameplate usually refers to the rated lifting capacity of the crane, which should be prominently displayed at an obvious position of the crane structure.
Secondly, for a boom type crane, its rated lifting capacity changes with the amplitude, and its lifting characteristic index is characterized by the lifting moment. The value marked on the label is the maximum lifting weight.
Third, for cranes with separable spreaders (such as grabs, electromagnetic suction cups, balance beams, etc.), the total lifting capacity of the spreader and the mass of the material is rated to allow the lifting material to be effectively lifted.
Lifting height H
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 retrieving device in m. Generally, when using a hook, it counts to the center of the hook and loop; when using a grab and other containers, it counts to the bottom of the container.
1. Descent depth h
When the picking device can be placed on the ground or below the top surface of the track, the lowering distance is called the descent depth. 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 lifting height and descending 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 center lines of the running rails of bridge type cranes in m.
The distance between the center line of the trolley running track of the bridge type crane is called the gauge of the trolley.
The distance between the center lines of the running rails of the ground-mounted boom crane is called the gauge of the crane.
Amplitude L
The amplitude of the swivel jib crane refers to the horizontal distance between the center line of rotation and the vertical line of the picking device in m. The amplitude of the non-rotating jib crane refers to the horizontal and horizontal distance between the centerline of the spreader and the rear axle of the jib or other typical axes.
When the boom angle is the smallest or the distance between the trolley position and the crane's slewing center is the largest, the amplitude is the maximum amplitude; otherwise, the amplitude is the minimum amplitude.
Working speed V
Working speed refers to the speed at which the crane working mechanism operates stably under rated load.
1. Lifting speed Vq
Lifting speed refers to the vertical displacement speed of the rated load of the crane in a stable operating state, the unit is m/min.
2. Cart running speed Vk
The running speed of the cart refers to the running speed of the crane with a rated load on a horizontal road or track, in m/min.
3. Car running speed Vt
The running speed of the car refers to the running speed of the car with a rated load on the horizontal track in a stable motion state, the unit is m/min
4. Luffing speed V1
Amplitude change 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 hung in the plane of the amplitude change in stable motion, and the unit is m/min.
5. Walking speed V.
Walking speed refers to the steady running speed of the mobile crane under the rated load when the road is driving, the unit is km/h.
6. Rotation speed ω
Rotation speed refers to the rotation speed of the crane around its center of rotation in steady motion, in r/min.
