| Customization: | Available |
|---|---|
| After-sales Service: | 2years |
| Warranty: | 24months |
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The Four ropes clamshell mechanical grab :
The four rope double-scoop grab is widely used in various settings such as docks, steel plants, power plants, ships, and bulk cargo storage yards. Its characteristics of high efficiency, stability, and strong adaptability make it one of the important tools in the field of bulk cargo handling.
1. Operating Principle
The four rope clamshell grab operates through two sets of steel wire ropes (each set consists of two ropes) to achieve its opening, closing, lifting, and lowering movements. One set of ropes serves as support ropes, responsible for maintaining the grab's balance and stability, while the other set functions as opening and closing ropes, controlling the grab's opening and closing actions.
Structural Characteristics:
The four-cable double-shell grab is primarily composed of a balance frame, upper support beam, support rod, lower support beam, upper and lower pulley blocks, and a double-shell bucket body. The double-shell bucket body opens and closes like a clam, with a beveled cutting edge at the front, which facilitates insertion into materials, reduces resistance, and enhances excavation force. Additionally, the grab adopts three-dimensional virtual design and undergoes strength checking and analysis using professional software to ensure reasonable weight distribution and a long service life.
| Four rope clamshell grab | |||||||
| Volume | m3 | 2 | 2.5 | 6.3 | 8 | 10 | 15 |
| Close height A | mm | 2010 | 2690 | 3433 | 3522 | 3867 | 5066 |
| Open height B | mm | 1940 | 2330 | 2586 | 2578 | 2811 | 4649 |
| Close width C | mm | 1750 | 2170 | 2975 | 3198 | 3480 | 4579 |
| Open width D | mm | 2630 | 2820 | 4633 | 4932 | 5408 | 5952 |
| Nubmers | 6 | 6 | 6 | 6 | 6 | 6 | |
| closed form | Full closed | Full closed | half closed | half closed | half closed | half closed | |
| Closing time | sec. | 11 | 11 | 13.5 | 13.5 | 19 | 19 |
| Opening time | sec. | 9 | 9 | 9 | 9 | 11 | 11 |
| Dead weight | kg | 1700 | 1950 | 4800 | 5250 | 6940 | 8000 |
| Control mode | valve control | valve control | valve control | valve control | valve control | valve control | |
| Motor rating | kw | 11 | 15 | 30 | 30 | 37 | 45 |
The working principle of the four-cable double-shell grab is relatively simple. Two double-drum reels on the crane release four steel wire ropes, two of which are connected to the support ropes to maintain the balance of the grab, while the other two are connected to the opening and closing ropes to control the opening and closing of the grab. When the opening and closing ropes descend, the grab opens for unloading; when the ropes ascend, the grab closes for grabbing materials. The closing force of the grab is achieved through the force amplification effect of the upper and lower pulley blocks, and a higher ratio results in greater excavation force.
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