Backhoe and excavator booms and arms are frequently manufactured of low-alloy steels that have been heat-treated to achieve the required tensile strength (50,000-100,000 psi) and toughness standards. These alloys can be either cold-drawn or hot-rolled.
The most common boom joints are right angles; however, other configurations are used depending on the application. For example, a circle would be needed where two circles meet because the buckets on excavators rotate in a full circle when digging. A square joint is used on backhoes because the shovel is rigid enough to handle the stress of this type of joint.
Other components of an excavator arm include the shoulder, elbow, and wrist joints. The shoulder joint connects the base of the excavator arm to the body of the machine. It can be ball or hinge type. The elbow joint connects the arm to the body at a 90-degree angle from the shoulder joint. The wrist joint connects the upper end of the forearm to the hand, which operates the bucket or other tool attached to it. There are also gearbox and transmission cases located here that contain the drive system for the arm and bucket.
Boom and arm assemblies can be purchased complete or broken down into its individual parts for easy shipping and storage.
Backhoes Backhoes, sometimes known as diggers, are prevalent on construction sites, however they are frequently mistaken with excavators. Backhoes and excavators have comparable digging and lifting capabilities, but they differ in size, weight, and usefulness. Excavators are typically massive pieces of machinery that may weigh up to 200,000 pounds. They tend to be large enough to perform most general construction tasks. Backhoes are much smaller than excavators, usually weighing less than 40,000 pounds and designed to handle more detailed work such as clearing land for construction projects.
Backhoes can be manual or electric. Electric backhoes are equipped with a motor that drives the bucket through a system of gears or shafts. Manual backhoes are driven by hand or through a crank mechanism. Their buckets are usually attached to the end of a long arm that is swung around to open up the hole deeper inside the ground or pile of debris to be dug out. Then the bucket is lifted up and moved to the next spot where it is lowered down again. The arm is then swung around once more and used to lift dirt or other material over the top of the hole.
Manual backhoes are generally cheaper than electric models because there are no motors to buy or maintain. Also, they are easier to use because you do not need special training to operate them. However, electric backhoes can reach holes that manual ones cannot because they can pull themselves along on wheels or tracks instead of being pushed by a tractor.
The following are the several types of heavy machinery usually used in construction: Backhoe Excavators:
The most popular excavator class utilized on demolition wrecking operations is the 200-series. Larger buckets (30-42 cu. yrd. ), a broader stance, and greater lifting ability and reach are all features of these 20+ ton machines. They are generally used in place of the 150-series for larger jobs.
Internally, these machines are very similar to their 150-series counterparts. The main difference is the size and power of the engine that drives the bucket. A 200-series machine will usually have a diesel engine while a 150-series has a gas engine. Other differences include additional safety devices such as interlock switches for the hydraulic systems or more powerful electrical motors for operating other components like the backhoe.
Demolition work is best done with a large machine capable of moving heavy objects. The larger the bucket, the better it can handle hard materials like concrete. More horsepower is also helpful for breaking down structures made of thick metal or wood. A smaller excavator may be suitable for clearing land for construction projects or small demolitions where you don't need much capacity to lift something.
Excavators are expensive machines to buy and operate. Make sure you understand how an excavator functions before you invest in one. Also, do your research before you select a specific model; there are many different manufacturers out there that produce similar types of equipment.
Names of 8 Heavy Construction Equipment
Excavator Bucket Teeth: Cast bucket teeth can be formed of a low-alloy steel alloyed with nickel and molybdenum. Molybdenum enhances steel hardenability and strength, and it can also aid to reduce some types of pitting corrosion. Nickel adds hardness to the tooth, and also acts as an antioxidant. The teeth will also often contain small amounts of other elements such as phosphorus, sulfur, and chlorine to improve their strength and durability.
The most common material for making cast bucket teeth is silicon iron. This material is easy to work with and has sufficient strength for use as a digging tool. However, because it does not provide much wear resistance, it must be refractory treated before use.
Steel bucket teeth are produced by melting scrap metal in a furnace and pouring the molten metal into wooden molds. The resulting teeth are heated to approximately 1000 degrees F (542 degrees C) during use and then cooled naturally after they have been removed from the machine. Because this process eliminates the need for casting equipment, it is more economical than making teeth using iron or silicon iron. However, steel bucket teeth cannot be hardened like cast iron teeth can be. This makes them less resistant to abrasion damage.
Cast iron bucket teeth are produced by heating and melting iron scraps in a furnace and then molding the hot metal into buckets.
What Is the Appearance of an Excavator? In many aspects, an excavator is similar to a backhoe. A chassis, boom, digging bucket, and dipper are all included with this equipment. An excavator can operate on wheels or tracks. It can be self-propelled or tractor-drawn.
The size of an excavator depends on its use. Small excavators are used in the construction industry and for other small projects. Large excavators are used in industrial settings and during highway repairs. Excavators are also used in mining applications.
Excavators are heavy machines that use motors to power various parts of the machine. The engine lies behind the driver's seat and usually has more than 100 horsepower. This engine drives the rear wheel assembly via a transmission. Some excavators have their own hydraulic systems instead. These systems are open loop systems where the pump is connected to the hydraulic tank by a valve system. The operator controls the flow from the tank to the various tools on the machine by opening and closing valves. Other components such as the steering system and the cooling system are also controlled by valves.
An excavator's main function is to dig holes. The depth that it can dig is limited only by the size of its bucket. Smaller excavators have buckets that are designed to scoop out dirt and place it into a truck for removal.
To raise cargo, a boom truck crane, also known as a telescoping crane, employs high-boom angles and a hoist. These cranes are built to be strong and stable, and they are often used to raise huge goods vertically. They can lift objects that would be too heavy for a conventional truck crane.
Boom truck cranes are commonly used by construction companies, industrial plants, and warehouses to raise materials for building projects, repair equipment, or move items in or out of vehicles.
These are only some examples of what cargo may need to be lifted with a boom truck crane. Your local truck crane company can tell you more about the various uses for boom truck cranes.
The first step in choosing a boom truck crane is determining how much weight it will be able to lift. The load capacity of your chosen model should be listed on its manufacturer's website or in the sales brochure. If it isn't listed there, call or email the company to find out the maximum weight it can lift.
You'll also want to know how tall the maximum height of lift will be before requiring extension legs. Most boom truck cranes have a safe working height of around 20 feet, but some can go up to 60 feet or higher. Longer lifts require longer extension legs to keep the tip of the crane's boom clear of any structures at those heights.