English Views: 0 Author: Site Editor Publish Time: 2023-03-05 Origin: Site
Truck-mounted cranes have changed the game in some industries. This includes construction, mining, and logistics. They mix performance and versatility better than any piece of equipment before them. The core of these cranes lies within a highly complex boom telescopic cylinder. Today we’re going to give you an in depth look at how this works, helping these machines reach new heights.
A telescopic boom cylinder plays a crucial role. It extends and retracts the crane’s boom while supporting weight during lifts. The amount of jib sections on the crane influences how it telescopes; these can change based on tonnage. Let’s delve into the engineering marvel behind this.
Three mechanisms are used for telescopic boom cranes. All three take their own unique approach to extending the crane’s boom.
Synchronous Telescoping: Imagine all sections of the boom extending at once, moving like a symphony but at the same stroke ratio. You get this coordinated dance by using a single wire rope to expertly synchronize all cylinders together.
Sequential Telescoping: To make a telescopic arm, you’ll need multiple cylinders. Each cylinder will be responsible for driving a section in a specific order. Starting from the outside and moving inward will create a really well synced mechanical ballet.
Sequential Plus Synchronous Telescoping: This is the best of both worlds. Combining synchronous and sequential telescoping makes the internal structure more streamlined, reliability enhancement, and optimization.
To efficiently execute their functions, there are different types of boom telescopic cylinders.
Perfect for synchronous telescopic systems. These cylinders are designed with a piston rod connected to the basic arm, and a cylinder barrel linked to the two-section arm. It has an internal oil guide tube that eliminates the need for external hoses which simplifies the inner workings of the boom.
Sequential telescopic systems use these cylinders to take charge. They have a primary cylinder piston rod connected to the basic arm, while the cylinder barrel connects to the two-section arm. The two cylinders only require one steel pipe and two hoses between them, so hydraulic oil leakage is minimized.
These cylinders are suitable for sequential or sequential plus synchronous telescopic systems. The primary cylinder's piston rod is connected to the basic arm, while the cylinder barrel is connected to the two-section arm.
The secondary cylinder’s piston rod links to the primary cylinder’s barrel, which is then connected to the three-section arm. Finally, the tertiary cylinder’s piston rod is linked to secondary cylinder's barrel and connected to a four sectioned arm.
As we dive further into this world of sequential telescopic cylinders, it is important to understand how their control mechanisms operate.
The cycle of expansion and retraction is determined by the difference in cross-sectional area between two cylinders. This may be less precise due to some annoying limitations when trying to maintain significant differences between one another
To get the two cylinders to work together, we throw two one-way valves into the telescopic oil circuit. To control when hydraulic fluid is sent, all you have to do is adjust the opening pressure difference between them with a reversing valve.
Instead of using hydraulic systems, this method uses mechanical touch control. It’s cheaper and relies on movement rather than fluids. Less precise but more cost-effective.
All in all, we can’t forget about the telescopic boom cylinder in truck-mounted cranes. They’re what extend and retract it while also making sure it’s stable and reliable. The choice of the boom telescopic cylinder depends on how you’ll be using it and the crane itself. These tiny little details are essential to getting every bit of power out of these things.
