Causes and hazards of unsynchronized travel of the two ends of the electric single-beam crane

In the process of using an electric single-beam crane , under normal circumstances, the corresponding wheel sets installed on both sides of the moving single-beam crane will move synchronously on the same horizontal line. Even if there is a small error in the wheel set, this error range will not affect the normal operation of the single-girder crane. At this time, there will be no squeezing between the wheel flange of the cart and the rail of the moving single beam crane. When the cart of the moving single-beam crane travels, the position of the wheel set on both sides will be offset-the stroke difference will cause the cart body to deviate relative to the track, causing extrusion between the wheel flange and the track. Make the carts travel out of sync to form a gnawing track .

When the carts are not synchronized, it will seriously affect the normal use of the single-girder crane, and even cause production accidents. The technical staff analyzed the fault and concluded that the reasons for the out of synchronization are as follows:

1.  The speed of each big wheel of the electric single beam crane is inconsistent. The reason for the inconsistency of wheel speeds may be different wheel diameters, unsynchronized transmission mechanism, and different brake tightness. Specific problems need to be analyzed in detail.
2.  If the friction between the crane wheel and the track fluctuates (for example, there is oil pollution on one of the tracks), it will also cause the moving mechanism of the cart to travel out of synchronization;
3.  Exceeding the level difference of the crane's carriage track is also a reason that affects the non-synchronization of the carriage's traveling mechanism;
4.  The center of gravity of the car cannot be shifted;
5.  When installing a single-beam crane, errors in the installation of the wheel set will also affect the wheel speed synchronization.

The hazards of unsynchronized crane carriage :

It is a serious problem that the electric single-beam crane is out of synchronization in the traveling mechanism. A slight out-of-synchronization of the traveling of the large trolley will damage the wheel rim of the large trolley and wear the side of the traveling track; serious unsynchronized traveling of the large trolley will occur. The rim is deformed or the metal on the side of the track falls off, and even a derailment accident occurs.

1. Asynchronous movement of the carts affects the foundation, building beams and bridge frames

The unsynchronized movement of the trolley of the electric single-girder crane makes the wheels and the track inevitably generate force. This force will squeeze the track, affect the wheel speed, cause the equipment to shake, and eventually lead to the bolts used to stabilize the track. Loosening occurs and the entire cart vibrates. These vibrations will affect the stability of the beam and bridge structure.

2. Asynchronous movement of large vehicles and gnawing rails threaten the safety of people and equipment

Severe out-of-synchronization of the trolley traveling will severely wear the traveling track of the crane, causing poor contact between the wheels and the track when the trolley is traveling, causing the trolley to be unusable and must be replaced, which increases the cost of the project and affects production. Electric single-girder cranes belong to high-altitude operations. When the trolley is traveling, especially when the joint gap of the trolley track becomes larger, it is more likely to cause the derailment or fall of the electric single-girder crane and cause major safety accidents.

3. Asynchronous travel of the trolley affects electrical equipment.

When the traveling structure of the electric single-girder crane is not synchronized, the force will be generated to prevent the wheels from moving forward, thereby increasing the force load of the power system of the crane operation, because the traveling of the trolley increases Current increases the power loss of electrical equipment components. When the electric single-beam crane is traveling, the running resistance is generated due to the unsynchronized traveling, and the motor is overloaded. It is very easy to cause accidents of electrical equipment burned due to overload, and it is easy to damage the transmission system.

In the daily use of single-girder cranes, attention should be paid to maintenance. When the walking error of the wheel sets on both sides is found to exceed the allowable range, the rotation speed of the wheels on both sides should be adjusted: reduce the rotation speed of the front wheel in the relative position, and increase the rear wheel in the relative position Or keep the rotation speed of one wheel unchanged, and increase or decrease the rotation speed of the other wheel correspondingly, so that the travel difference formed by the two wheels is within a safe range. This can effectively prevent the crane's trolley from traveling out of sync and prolong the service life of the crane.