Characteristics of Overhead Crane

发表于由
回复

The overhead crane is a lifting equipment that is horizontally framed over the workshop, warehouse and material yard for material lifting and is currently more commonly used crane. It is an important tool to realize the mechanization and automation of the production process in modern industrial production and lifting.

The following are the characteristics of overhead crane:

  1. The bridge frame adopts a box-shaped main beam and is welded by automatic submerged arc welding.
  2. The electric conduction of the trolley adopts a new I-steel track cable conduction device, which is safe and reliable.
  3. The lifting mechanism can also be equipped with a second set of safety devices according to requirements to increase reliability.
  4. Standardization, serialization and generalization of parts and components.
  5. The overall height of the overhead crane is low, which can increase the utilization rate of the plant, and the overhead crane hook has a wide range of operations
  6. The overhead crane has reliable structure, light weight, reasonable load, small foundation load, low failure rate and low daily maintenance workload.
  7. The overhead crane has high overall configuration, advanced and reliable electrical control, and has excellent overall system performance.
  8. The control room has a wide field of vision, all mechanisms are operated in the control room, and the work is comfortable and flexible.

 

How to prevent corrosion of overhead crane

发表于由
回复

After the overhead crane is transported from the workshop to assembly and acceptance, it begins to enter the wear stage. It is a slow process. The surface oxidation of the crane is the most obvious. Therefore, workers need to maintain equipment frequently to remove external dust and prevent corrosion. When it is rainy in summer, a layer of oil film can be sprayed on the surface of the overhead crane to isolate the humid air.

How About General Gantry Crane?

发表于由
回复

General-purpose gantry crane is a type of bridge crane, also called gantry crane, which is mainly used for outdoor cargo yard, stock yard, and bulk cargo loading and unloading operations. Its metal structure is like a door-shaped frame. Two supporting feet are installed under the main beam, which can walk directly on the ground track. The two ends of the main beam are designed with out hanging cantilever beams. Gantry cranes are widely used in port cargo yards due to their high site utilization, large operating range, wide adaptability and strong versatility.

The general-purpose gantry crane has a span of 14.5m, a lifting height of 6m, and a lifting MG50/16T. It adopts a box-shaped double-beam welded structure. There is also a truss type (flower type) with a model M. MG means double-beam portal type, generally equipped with main and auxiliary hooks, such as 50/10T, 32/5T, etc. The box-shaped double-beam welding structure not only increases the working space, but also facilitates the transportation, installation and maintenance of the crane. The end beam is a torsion resistant welded box beam structure. In the later process of the main end beam connection, the process of laser calibration and countersinking of the connecting plate and the connection with 10.9 high-strength bolts are used to effectively ensure the rigidity and accuracy of the equipment. The trolley is conductive with flexible cables, and the trolley is with sliding contact line type and cable reel type for selection. It adopts a closed air-conditioning control room and is equipped with a linkage console control. It has a wide field of view, flexible operation, comfortable work, and high work efficiency.

Export Three European Type Overhead Cranes To Saudi Arabia

发表于由
回复

A total of 3 European-style single-girder overhead cranes were exported to Saudi Arabia this time, two of which were 5+5 tons and one was 10 tons.

This is our second cooperation with Saudi Arabia. It took us a week to have a detailed conversation with our engineers and determine the plan and parameters. This is a pleasant cooperation.

We will serve our customers sincerely, and do our best to solve the problems of our customers.

 

Analysis of the causes of wear of wire rope electric hoist gears

发表于由
回复

Another type of failure of the transmission gear on the worn wire rope electric hoist is wear, and the teeth become thinner after wear. If there is wear caused by impurities in the lubricating oil, it is generally called abrasive wear. This wear often has deep scraping at the top and root of the tooth, which is perpendicular to the pitch line and parallel to each other. After the occurrence of the scraping path, the oil temperature in the reducer rises and the gear drive produces fine noise. At this time, the lubricating oil must be replaced. Due to the deviation of the tooth profile and the deviation of the installation center distance, the gear tooth tip edge and the root transition curve portion may be excessively squeezed, so that the tooth root radius portion is subjected to severe wear. Due to the overload, the root of the drive wheel or the top of the driven wheel (and sometimes the entire tooth face) is often worn away by a thin layer.

After the gear of the hoisting mechanism reducer wears, the tooth thickness should not be less than 60% of the original tooth thickness. For the running gear, the tooth thickness should not be less than 80% of the original tooth thickness. If the gear exceeds the standard, the new gear should be replaced. The tooth thickness wear can be tested by measuring the tooth thickness of the indexing caliper. The measurement method is shown in the figure. The tooth caliper is a comprehensive caliper of the vernier caliper and the depth gauge for measuring the tooth thickness. When measuring, first find the tooth height from the drawing (that is, the height from the indexing circle to the top of the tooth), and adjust the vertical scale of the measuring caliper to this height. Then, the claws are caught by the teeth, and the tooth thickness is measured with a horizontal scale. The measurement accuracy can reach 0.02mm.

 

Common fault of crane pulley and prevention measures

发表于由
回复

During the use of the crane, the mechanical parts inevitably follow the wear law and appear visible wear. The cause of the same fault may not be a one-to-one relationship. Therefore, the fault should be carefully analyzed, and the cause should be accurately found and solved. The following conditions occur on the crane pulley:
[1] uneven pulley pulley wear;
[2] The pulley mandrel wear amount is 3 to 5% of the nominal diameter;
[3] The pulley does not move;
[4] The pulley is tilted and loose;
[5] Pulley crack or rim break.

Processing method
[1] The wear of the wheel groove wall is 1/10 of the original thickness, and the radial wear amount should be replaced when the wire diameter is 1/4;
[2]Strengthen lubrication, overhaul, and need to be replaced if the fault is serious

[3] Loosen the positioning parts on the shaft, or the wire rope jumps for maintenance and replacement.

[4] Overhaul
[5] Replace

Precaution
[1] Check whether the material is uniform, whether the installation meets the requirements, and whether the rope and the wheel are in good contact;
[2] Regularly check the mandrel and wire rope wear;
[3] Regularly check whether the positioning parts on the shaft are loose and whether the wire ropes are skipped;
[4] Regularly check the wear of the pulley.

 

Five Important Cranes Parameters to Know before Purchasing a Crane.

发表于由
回复

Five Important Cranes Parameters to Know before Purchasing a Crane

Crane widely used in plants, warehouses, material stocks to lift goods or materials. It is prohibited to use equipment in the combustible, explosive to corrosives  environment.

In order to supply the suitable overhead crane, each buyer should understand these technical parameters as follows: crane lifting capacity, crane lifting height, work duty, span, and control model.

  1. Crane lifting capacity means the crane lifting weight.The lifting capacity of a machine refers to the maximal weight that it can safely lift. For optimal results when it comes to using a crane, be sure to identify its lifting capacity. Failing to do so can result in serious damage to the machine or even serious injury.
  2. Crane lifting height refers to how much height can the crane lift. You must understand that the difference among crane clearance, height of lift or hook height and hoist lift, and don’t be confused by a vendor quote regarding the term “Lift”. Take a Single Girder Overhead Crane for example.

3 .Work duty.it can be classified from A1 to A8.It depend on how many hours the crane will be work every day.

Bridge Crane vs Gantry Crane

发表于由
回复

When you hear the word “crane,” you probably think of either the piece of mechanical equipment or the bird. In this case, you’ll want to keep the image of the lifting system “crane” in your mind. Sometimes, figuring out what type of lifting equipment you will need requires taking a step back. Maybe you just want to learn more about the benefits of cranes in comparison to other overhead material lifting options. Keep reading to find out more information on the bridge crane vs gantry crane, including what they have in common and how they differ.

Both principally used in industrial applications, the bridge crane and gantry crane can often be found in manufacturing facilities and other handling locations like a shop yard or factory. Bridge cranes and gantry cranes are both used to move bulk materials or shipping crates.

The bridge crane is one of the most common types of shop cranes in the world. This type of crane is characterized by one or more parallel bridge beams on which the trolley runs back and forth. It runs along an elevated runway, typically the length of the building or factory. The runway beams are raised high above the ground by a standalone system that is a part of the building, or by columns. At the end of the beam is a truck that directs the trolley’s movement. One important benefit of overhead cranes is that they permit flexibility for when and where the load can be placed onto the crane. Over a specified area, there are multiple lifting points.

The bridge crane comes in two different forms: single girder and double girder. Single girder overhead bridge cranes are normally used for loads under 12.5 tons, where double girder cranes are helpful for loads over 12.5 tons. Specifically for double girder cranes, other features can be added such as a maintenance walkway or auxiliary hoist. A few points you may want to consider before purchasing an overhead bridge crane include:

  • How long does the runway need to be?
  • Will the bridge be supported by the building structure, self-supported, or a combination of both?
  • Will the bridge be indoors or outdoors?
  • What is going to power the crane: motor, push-pull, hand-geared, or a combination?
  • What bridge capacity is necessary?

Only slightly different from the bridge crane is the gantry crane. This type of crane is helpful for buildings or outdoor projects that do not have a runway installed. Gantry cranes can come with single girder or double girder options, depending on the need, and can be made of a box girder or a standard profile beam. The bridge of a gantry crane is held up by two A-frame steel legs that remain on the ground. Typically, this type of crane is installed with casters so that the crane can move between locations. Sometimes, you’ll find a gantry crane that runs along tracks on the floor or uses a V-groove caster to keep the movement in a straight line. The end truck system that moves the crane back and forth on the runway can differ depending on the application and load.

When looking at both the overhead bridge and gantry cranes together, you’ll notice that they are quite similar. They are supported at both ends, therefore they have fantastic capacity potential. In addition, they regulate load movement in three dimensions, allowing for greater control. Finally, they have an efficient covering area and can be powered in a variety of ways. One main difference that you’ll want to notice is the price. Typically, the gantry cranes are less expensive than the bridge cranes.

 

If you’re considering buying a bridge crane or gantry crane, be sure to do your research before making a purchase. Since they are fairly similar, you’ll want to choose the one that is best suited for your application and force load.

Analysis of the causes of wear of wire rope electric hoist gears

发表于由
回复

Another type of failure of the transmission gear on the worn wire rope electric hoist is wear, and the teeth become thinner after wear. If there is wear caused by impurities in the lubricating oil, it is generally called abrasive wear. This wear often has deep scraping at the top and root of the tooth, which is perpendicular to the pitch line and parallel to each other. After the occurrence of the scraping path, the oil temperature in the reducer rises and the gear drive produces fine noise. At this time, the lubricating oil must be replaced. Due to the deviation of the tooth profile and the deviation of the installation center distance, the gear tooth tip edge and the root transition curve portion may be excessively squeezed, so that the tooth root radius portion is subjected to severe wear. Due to the overload, the root of the drive wheel or the top of the driven wheel (and sometimes the entire tooth face) is often worn away by a thin layer.

After the gear of the hoisting mechanism reducer wears, the tooth thickness should not be less than 60% of the original tooth thickness. For the running gear, the tooth thickness should not be less than 80% of the original tooth thickness. If the gear exceeds the standard, the new gear should be replaced. The tooth thickness wear can be tested by measuring the tooth thickness of the indexing caliper. The measurement method is shown in the figure. The tooth caliper is a comprehensive caliper of the vernier caliper and the depth gauge for measuring the tooth thickness. When measuring, first find the tooth height from the drawing (that is, the height from the indexing circle to the top of the tooth), and adjust the vertical scale of the measuring caliper to this height. Then, the claws are caught by the teeth, and the tooth thickness is measured with a horizontal scale. The measurement accuracy can reach 0.02mm.

 

What are EOT Cranes and Hoists?

发表于由
回复

EOT stands for Electric Overhead Traveling, so in essence this is a moveable overhead crane that is powered by electronics. Most overhead cranes and hoists are custom built so that they work perfectly in a designate workspace. Different industries have different requirements, and so each crane can have different technologies built into them. These overhead cranes and hoists are used in many different industries; construction companies who have to move materials, production halls, assembly lines, storage areas, and even power stations use overhead cranes and hoists. The rest of this article will be devoted to discussing types of electric cranes.

There are a series of questions that you could ask yourself to determine what type of crane you need, as well as helping to pick the specific type of EOT Crane. First, what is the capacity of your lifting requirements? This is one of the most important questions, and you must determine a standard weight, size, and lifting style for your production or application. Secondly, what type of Duty Cycle will you be using your EOT Crane and hoist?  This answer involves answering how many lifts per hour and how long each lift is.  These are just some of the considerations you must take into account. Contacting a local overhead crane and hoist construction company will help you answer a full set of questions. A professional company will take you through each question one at a time, so that they can fully understand you business and needs.

There are four main types of EOTs: Single girder, double girder bridge, gantry, and monorail. Each of these cranes are highly specialize, but can be consider part of three categories: