Single-beam bridge crane is also called electric single-beam crane . It is a kind of lifting equipment that is widely used in workshops. The quality of its installation affects the later use of the crane. I will explain the single-beam bridge crane here. Precautions for installation and commissioning.
1. Installing the crane on the track above the factory building is a very important and troublesome and meticulous work. This work should be entrusted to professional installation agencies or technicians and workers who have a deep understanding of this knowledge.
2. When installing the crane, pay attention to the following matters:
2.1. Before installation, carefully check whether the electric hoist and all parts of the traveling mechanism are corroded or damaged, and whether the bridge has overall deformation or partial deformation of each component. If the mechanical parts are rusted or damaged due to careless storage during road transportation or due to the user’s purchase time for too long, the mechanism should be disassembled and the parts should be placed in kerosene to clean the rust. The extent and nature of the damage; repair and replace, and then assemble them.
2.2. Before installation, level the bridge at the installation site, and then mount the electric hoist and hang on the lower wing of the I-beam (you can also install the bridge first, and then hang the electric hoist). When mounting, there should be a clearance of 3 mm between the inner surface of the wheel flange of the hoist and the lower wing of the I-beam. All nuts on the hoist should be tightened, and the split pins must be securely pinned. If the electric hoist is hoisted together with the bridge frame, You should first use a tough hemp rope (or cotton rope) with a diameter of 15 to 18 mm to securely tie the gourd to the middle of the I-steel to prevent it from moving along the I-steel.
2.3 All kinds of tools used in the installation of cranes, such as truck cranes, should be strictly inspected in advance, and can only be used when the safety and reliability of these tools are verified.
The safety factor of the steel rope used to lift the crane during installation shall not be less than 3. That is to say, if the maximum possible pulling force of a certain hoisting steel rope during work is N, then the breaking force of the selected steel rope should not be less than 3N.
2.4 When hoisting the crane, use the main beam hoisting hole to pass the wire rope, and it is absolutely forbidden to bundle the transmission part of the end beam.
2.5. The fixed end (joint) of the crane steel rope must be reliably connected with steel rope clamps. The number of steel rope clamps depends on the force, but not less than three. The angle between the crane rope and the level should not be less than 45 as far as possible. .
2.6. The diameter of all pulleys shall not be less than 16 times the diameter of the steel rope.
2.7. No matter what method is used to install the crane, the lifting action should be steady and slow. When the jam occurs in the middle of the lifting, the cause should be quickly found out and eliminated. Do not blindly use strong pull.
2.8. When hoisting the crane, first hoist the crane to a height of about 100 mm above the ground and park it for 10-15 minutes to observe whether all the lifting mechanisms are reliable. After verification, continue lifting.
2.9. At the site where the crane is installed, the area for the installation work should be delineated. When the installation work is in progress, no one except the commander and installer is allowed to enter to ensure the safe and smooth progress of the installation work.
After the crane is installed, it should be commissioned before it is officially put into use. The commissioning should be carried out by a dedicated person.
The test run of the LD electric single beam crane includes three procedures. Only after the test run of the previous procedure is qualified, the test run of the next procedure is allowed.
The inspection work should be done before the test run. The test run personnel should check whether the assembly of all mechanisms is complete and correct, whether all fasteners are reliable, whether the mechanism has enough lubricating oil (grease), and whether there are any components of the bridge frame due to inadvertent installation. The resulting deformation and so on.
The so-called no-load test run refers to the test run under the condition that the electric hoist is not hoisted. First, start the electric hoist and let it walk back and forth along the full stroke of the lower wing of the I-beam for 2 to 3 times; then let the empty hook go up and down 3 to 4 times . Then start the crane traveling mechanism, let the crane walk back and forth along its entire journey 2 to 3 times, and finally, repeatedly start the traveling mechanism motor to observe whether the wheels are slipping.
The no-load test shall meet the following requirements:
1.1. There is no jam when the electric hoist walks along the lower wing of the I-beam;
1.2. There should be no abnormal swings, vibrations, shocks and jumps in the walking and empty hook lifting actions of the electric hoist;
1.3. All four wheels of the electric hoist should be able to contact with the lower wing of the I-beam;
1.4. The crane should not be jammed;
1.5. The wheels should not skid;
Before the test, the unloaded trolley should be parked at the extreme position of the end of the main girder, and the reference point for measuring the deflection of the main girder should be determined in the middle of the span.
Drive the trolley to a test load of 1.25Gn in the middle of the main girder, at a height of 100～200mm from the ground, and the hanging time is not less than 100min. After unloading, drive the trolley to the end of the main girder and check for permanent deformation. Repeat this three times. The main beam is allowed to have a little deformation in the first and second times, and the main beam shall not be permanently deformed in the third time. Drive the trolley to the end of the main beam and check that the actual camber of the main beam should not be less than 0.7S/1000 .
After the results of the static load test meet the requirements, the dynamic load test is allowed. Lift the electric hoist by 1.1 times the rated load, repeatedly start the walking mechanism of the lifting mechanism, and observe whether the limit switch works.
The dynamic load test run shall meet the following requirements:
3.1. The actions of each mechanism should be flexible and reliable, and there should be no abnormal shocks and vibrations;
3.2. The sliding distance of the lifting mechanism after braking S≤V/65m, where V is the lifting speed (m/min);
3.3. The bridge frame of the crane shall not be permanently deformed after being unloaded.
After all the above-mentioned test runs are completed, the results of the test run shall be written into a report, which shall be submitted to the competent authority for review and preservation.
For users who purchase our single-beam cranes, we can provide installation services. Professional installers will come to install them. After the installation is completed, the test runs, and the handover work is confirmed after confirming that there are no problems. Users can save a lot of trouble. Welcome to call and order.
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