Overhead Crane for Paper Making Plant

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Product：Overhead Crane for Paper Making Plant

Application site：Philippines

Working grade：A6

Lifting capacity：24/6ton

Span：15m

Lifting height：5m

overhead cranes for Paper Making Plant are used in cranes and material handling systems in the pulp and paper industry. Overhead Cranes for Paper Making Plant have become an important part of the paper industry’s production process. Based on our understanding of the industry’s technical processes and rich experience, we can provide a complete system solution. Services can include various fields such as wood, pulp production lines, paper and board production, waste paper deinking, paper towels, and even storage and transportation.

50 Ton Gantry Crane for Hydropower Station

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Application site：Philippines

Working grade：A5

Lifting capacity：50/20ton

Span：20m

Lifting height：14/16

The upper bridge of gantry crane (including the main beam and end beam), legs, lower beams and other parts. In order to extend the operating range of the crane, the main beam may extend beyond one or both of the legs to form a cantilever. Lifting carts with booms can also be used to extend the crane’s operating range by pitching and rotating the boom.

As a powerful and capable manufacturer, our company is quite confident to produce all kinds of gantry cranes to meet all your requirements with advanced technology and competitive price. Our main products mainly contains, overhead crane, gantry crane, jib crane and all sorts of hoist lifting.

 

Causes of wheel slip of bridge cranes

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overhead cranes (including single-girder bridge cranes and double-girder bridge cranes) have a total of 4 wheels at both ends. Some customers found that their cranes could not walk after starting, and the wheels slipped during operation. After analysis, There may be the following reasons:

  1. The 4 wheels are not in the same plane.

The four wheels of the bridge crane normally run on the same plane. If there is one wheel that is not on the same plane, padding should be added to adjust the angle bearing box.

  1. The start is too violent, or the braking response is too sensitive.

When the crane starts or stops, if it is too sudden, it will cause a short slip, and the fault can be eliminated by adjusting the brake.

  1. Check whether there is oil on the track and wheels, whether there is water on the open track, etc.

When there is oil, water, etc. on the track, the friction between the wheel and the track may be reduced, resulting in slippage. The track should be cleaned before use.

The wheel slip of the bridge crane should be dealt with in time, otherwise it is easy to cause the crane to run out of synchronization, resulting in rail gnawing and even derailment of the crane. Businesses must pay attention. If the double-girder overhead crane trolley slips, it is also the above three reasons.

How to check for wheel slip:

The method of checking the slippage of the car is generally to observe the torsion of the car body first, and then analyze the specific reasons. If two wheels slip, check which wheel is serious, put a lead wire of equal diameter on the track, push the trolley to press the lead wire, then take out the lead wire, measure the thickness of the two lead wire pieces with calipers, the thick one indicates the wheel pressure Small, thin ones indicate large wheel pressure. The wheel with small wheel pressure slips seriously. It can also be used to remove sand on the track to observe the degree of wheel slippage. Evenly remove the fine sand on a track in the slippery area, drive the trolley here, and start it back and forth several times. If it still slips, it means that the driving wheel on this track is not the problem, but the other track. The driving wheel pressure on the upper is small. The same test can be repeated.

The use and maintenance of the crane during the break-in period

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During the running-in period of the crane, everyone should pay attention to the maintenance of the crane to avoid the problems of poor lubrication, fast wear and loose connection pieces. The use and maintenance of bridge cranes and gantry cranes during the running-in period can be summarized into several items such as strengthening training, reducing load, paying attention to inspection, and strengthening lubrication.

  1. The crane operators arranged by the enterprise should receive training and guidance, have a full understanding of the structure and performance of the crane, and obtain certain operation and maintenance experience before they can operate the machine independently. Before operating the crane, be sure to read the operation and maintenance manual, and operate and maintain according to the requirements of the manual.
  2. Pay attention to observe the various instruments of the equipment. If any abnormality is found, stop the machine to check and eliminate the fault in time. If the cause is not found and the fault is not eliminated, the operation should be stopped.
  3. Pay attention to the workload during the running-in period. Generally, the workload during the running-in period should not exceed 80% of the rated workload, and pay attention to arranging a suitable workload to prevent the machine from overheating caused by continuous operation for a long time.
  4. Keep the machine clean, adjust and tighten the loose parts in time to prevent the parts from being worn out or lost due to loosening.
  5. Always check the level and quality of lubricating oil, hydraulic oil, coolant, brake fluid and fuel oil (water). During the inspection, it is found that there is too much oil and water shortage, and the reason should be analyzed. At the same time, the lubrication of each lubrication point should be strengthened. It is recommended that during the running-in period, grease should be added to the lubrication point in each shift (except for special requirements).
  6. After the running-in period, the machine should be compulsorily maintained, checked and adjusted, and at the same time, pay attention to the replacement of oil.

Enterprises pay attention to the use and maintenance of cranes during the break-in period, which can prolong the service life of various parts of the machine and reduce costs

 

What are the factors that affect the stability of a gantry crane?

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The structure, performance, shape and application fields of gantry cranes belong to general types, and are widely used in freight yards, factories, ports and other occasions. Regardless of single-girder gantry crane or double-girder gantry crane, there are some safety hazards in the application process of enterprises. Most of the induced reasons are due to the influence of the stability of the gantry crane.

  1. The center of gravity of the gantry crane is offset

Due to the irregular structure of the gantry crane, special care should be taken when calculating its center of gravity. If there is an error in the calculation, the center of gravity of the gantry crane appears to be up or other deviations, it is likely to cause the gantry crane due to the unstable center of gravity. Loss of balance, which eventually leads to a tipping accident of the equipment. Generally, regular manufacturers have production qualifications and professional technicians, so you can buy our products with peace of mind.

  1. There is a problem with the quality of the components of the gantry crane

For example, the components of the supporting legs of the gantry crane are broken, deformed, bent, etc. due to quality problems, which will affect the overall stability of the equipment and tilt.

  1. The gantry crane is subjected to a large external force

Gantry cranes generally work outdoors. If they encounter strong winds or collisions with other objects, the stability of the gantry cranes may be affected and the accident of tilting or overturning may occur. In the process of use, pay attention to the cleaning of the work area and take windproof measures.

  1. The gantry crane brakes suddenly during operation

The sudden braking will make the operating inertia of the gantry crane bring a huge torque, which will not only cause damage to the parts of the equipment, but also affect the stability of the gantry crane. In order to prevent such accidents, the brakes of the gantry crane generally Adjust properly to avoid sudden braking.

  1. The lifting operation of the gantry crane is not standardized

When the enterprise uses the gantry crane, if the operation rules are violated, the operator performs illegal operations, such as overloading, skew-pulling, unbalanced double-hook lifting, etc., which will affect the stability of the gantry crane.

  1. There is a problem with the installation of the gantry crane

For example, the surface of the installation site is inclined or the foundation is not compacted, and the components are not firmly fixed during installation, which will affect the stability of the gantry crane. The foundation of the gantry crane is a very important factor. If the user does not know how to do the foundation, he can contact us.

 

Electrical maintenance of electric single-girder cranes

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  1. In order to prolong the service life of the electrical equipment of the crane, the electrical equipment such as the contactor in the control box should be kept clean to prevent the occurrence of leakage breakdown and short circuit.
  2. When using the hanging cable to conduct electricity, the corner rust and dirt on the guide rail of the trolley should be removed at any time to keep the traction pulley running normally. Check the track: mainly observe whether the track is straight, whether the pressure plate is firm, and whether there is any looseness.

Overhead double-girder cranes are widely used

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Overhead double-girder crane is an important tool and equipment for mechanization and automation of production process in modern industrial production and lifting and transportation. Therefore, double-girder bridge cranes are widely used in indoor and outdoor industrial and mining enterprises, iron and steel chemical industry, railway transportation, port terminals and logistics turnover and other departments and places.

The double-girder overhead crane is a hoisting equipment that is horizontally mounted over workshops, warehouses and stockyards for material hoisting. Because its two ends sit on tall concrete columns or metal supports, it is shaped like a bridge. As the name suggests, it consists of two main beams. The bridge frame of the double-girder bridge crane runs longitudinally along the tracks laid on the elevated sides on both sides, which can make full use of the space under the bridge frame to lift materials without being hindered by ground equipment. It is the most widely used and the largest number of hoisting machinery.

All electrical equipment enclosures of overhead cranes should be grounded. If the trolley track is not welded on the main beam, measures should be taken to weld the ground wire. The grounding wire can be galvanized flat iron with a cross-sectional area greater than 75mm2 or bare copper wire with a cross-sectional area of 10mm2 or galvanized round steel with a cross-sectional area greater than 30mm2. There should be more than two grounding positions for the driver’s cab or the crane body. The grounding resistance between any point on the crane and the neutral point of the power supply should be less than 4Ω.

 

Precautions for safe use of overhead crane

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(1) each overhead crane must be in an obvious place to hang the rated weight of the sign.
(2) people are not allowed on the bridge or to transport people with hooks during work.
(3) you are not allowed to drive a crane without a license and after drinking.
(4) the operation must be focused, no talking, smoking or doing irrelevant things.
(5) the trolley should be clean; Do not misplace equipment, tools, inflammables, explosives and dangerous goods.
(6) the eot overhead crane is not allowed to be used under excessive load.
(7) lifting is not allowed under the following circumstances: the binding is not secure; Machinery overload; Unclear signal; Suspension; Things buried or frozen in the ground; A person on the hanging object; Inflammables, explosive devices and dangerous goods without safety protection measures; An overfilled liquid substance; Wire rope does not meet the requirements for safe use; There is something wrong with the lifting mechanism.
(8) when the girder overhead crane is running on the line without obstacles, the hook or sling and the bottom surface of the lifting object must be 2m above the ground. If the obstacle is cleared, the height of the obstacle shall be 0.5m.
(9) lifting objects less than 50% of the rated lifting weight, two mechanisms are allowed to operate at the same time; Lifting more than 50% of the rated lifting weight, it can only be a mechanism action.
(10) bridge cranes with main and secondary hooks shall not rise or fall at the same time (with special exceptions).
(11) welding, hammering and working under objects that are hoisted (when supported) are not allowed.
(12) only after the power failure and when the power failure sign is hung on the switch, can the inspection or maintenance work be done. If must live the work, must have the security measure protection, and has the special person to take care of.
Don’t throw things down from the trolley.
(14) limit switch and interlock protection device should be checked frequently.
(15) it is not allowed to touch the limit switch as a way to stop the car.
(16) when there is a problem with lifting brake, it is not allowed to lift heavy objects.
(17) hanging objects are not allowed to run above people or equipment.
(18) when welding a part of the crane, the ground wire shall be specially set, and the fuselage shall not be used for ground wire.
(19) when the hook is in the lower limit position, there must be more than two safety rope rings on the reel.
(20) cranes are not allowed to collide with each other, let alone use a crane to push another crane for work.
(21) when lifting heavy objects, liquid metals, explosive and dangerous goods, it is necessary to slowly lift them from the ground 100~200mm to test the reliability of the brake.
(22) lamps for repair and inspection must have a voltage below 36V.

 

 

Failure reason of electric hoist

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The sound of the electric hoist first indicates that there is a certain problem, and then it needs to be understood that the sound may be generated due to the failure of the motor or the reducer.

When the motor is faulty, it is generally necessary to check whether the motor is single-phase or bearing damage, the shaft of the coupling is not correct, and the “broom” is faulty. These will cause the motor to have abnormal noise. The sound position of different faults and the high and low sounds are different. During operation, the entire motor emits a “beep” sound that is regularly strong and weak. In addition, when the shaft of the coupling is not correct or the motor is slightly broomed, the whole motor will also emit a very high “click” sound, accompanied by a sharp and harsh sound.

If the reducer is faulty (such as gearbox or lack of lubrication, abnormal bearing noise, gear wear or damage, bearing damage, etc.), then the inspection should be closed. First, determine whether the gearbox or the bearing needs to increase the use of lubricating oil before the gearbox or bearing. Regular maintenance of the oil, because there is no lubrication, deceleration will not only produce excessive “click” sound, but also excessive wear or damage to the gears and bearings. Secondly, the brake stop distance exceeds the long-term application of the electric Wire Rope Hoist demand reduction length, the brake ring wear is too large, the spring brake pressure is reduced, and the braking force is reduced. Solution Adjust the bolt or replace the brake ring. If the motor temperature is too high, first check if the hoist is overloaded, resulting in electric heating. If the motor is not overloaded and still hot, check the motor bearing damage. Also check whether it meets the power requirements for the work. This is one of the reasons caused by electric heating. When the motor runs, the brake clearance is too small, there is considerable friction, friction heat is generated, and additional load is generated, which causes the speed of the motor to decrease and heat. At this time, the work should be stopped and the brake is turned off again.

Motor failure or gear unit failure is the main cause of the electric hoist. If the electric hoist is found to be“squeaky”, it should stop in time, check the motor and reducer, and take corresponding measures.

What are the characteristics of electric hoist accessories

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Metallurgical Electric Hoist, on the basis of CD1, MD1 electric hoist specially designed for metallurgical, lifting work of molten metal electric hoist, operating grade M6. The data of each part of metallurgical electric hoist has advanced level and each part has its particularity. If the forward chain is used at 200 ambient temperature, the tensile strength will not decrease.
The data of each part of metallurgical electric hoist has advanced level and each part has its particularity. Without the use of lifting chains at 200 ambient temperatures, the tensile strength does not decrease. Metallurgical electric hoist is a kind of hoisting equipment with high quality alloy steel lifting chain. Motor equipment for metallurgical electric hoist: motor insulation grade F, cast-aluminum shaped housing, connection to external cooling fan for high frequency applications.
Brake equipment plays a role in metallurgical electric hoist: in addition to having an attractive rotor brake planned together, a mechanical brake type conflict clutch with safety braking function is supplied. Limit switch application: with double limit function, upper and lower limit switch, hammerhead limit switch. Conflicting clutches work: when the load exceeds the rated load, the conflicting clutches will prevent damage to the Chain Hoist.
If the limit switch (heavy hammer, upper and lower limit) fails, the conflict clutch action will avoid damage to the chain electric hoist. The metallurgical electric hoist has the service life requirement: it can reach the M6 operation level, so the service life of this ring chain electric hoist is long. Space saving, easy to change the structure: the minimum hook distance, the total volume is small, can be set in a small space. Forward height briefly changed. Given that it is set to the new use orientation, it is convenient to change the structure (forward height/rail width, etc.). This metallurgical special ring chain electric hoist is most suitable for lifting molten metal. Is a high quality, light weight, sensitive operation, reliable function, wide range of applications of special chain electric hoist.