توسعه راه تولید کننده و فروشمده ی انواع دکل و استیک سایز استاندارد و سایز کوتاه و بلند بیل مکانیکی،بیل بکهو،بابکت و …

In applications that utilize long boom/arm combinations, the main benefit is an expanded working range that can add versatility for certain applications. “If there is a drawback to longer work equipment, it is that your digging forces can be reduced and, in order to maintain stability, the bucket size may need to be reduced,” says Yureskes.

Longer boom and stick options will usually reduce arm crowd forces. “Over the side lifting forces will typically be reduced due to the long work equipment having a larger impact on machine stability, whereas over the front lifting is more dependent on hydraulic forces,” says Yureskes. “Shorter boom/arm options have an opposite effect with a limited working range.”

Arm length also has a direct relation to the size of the bucket that can be used. “The shorter the arm, the more arm force and the larger the bucket,” says Boyle. Let’s take a look at arm force of a mid-size 76,557-lb. excavator for which Deere offers three arm lengths:

A short arm is 8 ft. 9 in. in length and has 45,914 lbs. of arm forceA medium arm is 10 ft. 6 in. in length and has 39,930 lbs. of arm forceA long arm is 13 ft. 1 in. in length and has 34,314 lbs. of arm force.

“There is 11,600 lbs. of breakout force difference between the short and the long arm,” says Boyle. “But many contractors are not worried about arm force. They need more reach for finishing the bottom of the trench, pulling the trench box and installing longer sections of pipe.”

Now let’s look at the difference in recommended bucket sizes for material that weighs 2,400 lbs. per cubic yard:

With a short arm, Deere recommends a 2.8-cu.-yd. bucketWith a medium arm, Deere recommends a 2.6-cu.-yd. bucketWith a long arm, Deere recommends a 2.4-cu.-yd. bucket.

“In all aspects, it looks like the shorter arm will provide more productivity,” says Boyle. “But in reality, it depends on the application and types of material the contractor is digging. The shorter arm will fill the bucket quicker with hard material; but with softer material, the excavator with the shorter arm will have more moves and more joints in the pipe.”

There are other trade-offs to consider. “A drawback to shorter working equipment is that the working range is reduced, limiting the ability to achieve desired depths or dump heights,” says Yureskes. “The benefit to short boom/arm combinations is that the working forces are closer to the machine, so generally the operator experiences greater stability and also has an expanded range of attachments and bucket sizes that can be utilized if the application requires.”