Electro-Hydraulic Grab Buckets shows the high-precision, self-powered components of bulk material handling.
What are Electro-Hydraulic Grab Buckets?
An electric grab is a self-contained unit featuring an integrated electric motor, hydraulic pump, and cylinders.
Power Link: Like an EOT crane, it offers electrical power through a cable reel.
Action: The electric motor drives the hydraulic pump, which forces high-pressure oil into cylinders to open or close the sheels or jaws.
Advantage: The closing force is designed hydraulically, offering more digging pressure than mechanical grabs, making them superior for compacted materials.
Variants & Types of Electro-Hydraulic Grabs
| Variant | Design Engineering | Ideal Materials | Industry Use Case |
|---|---|---|---|
| Clamshell Grab | Two symmetrical shells with precise edge sealing. | Grains, Fertilizers, Cement, Sand, Coal. | Marine Ports & Bulk Storage |
| Orange Peel Grab | 3 to 8 independent semi-enclosed tines. | Steel Scrap, Municipal Waste, Boulders. | Steel Mills & Recycling Plants |
| Rectangular / Log Grab | Wide, flat jaws or specialized tines. | Timber, Logs, Industrial Bundles. | Forestry & Paper Mills |
| Leak-Proof (Eco) | Overlapping shells with rubber seals. | Fine Chemicals, Toxic Powder, Fly Ash. | Chemical Plants & Energy Sector |
EH Grab Cycle Optimizer
Focus: Hydraulic Kinematics & Flow Efficiency
Pro-Standard Technical Specification Table
| Technical Specification | Small Class | Medium Class | Heavy Class | Mega Class |
|---|---|---|---|---|
| Volume Capacity | 1.0 – 3.0 m³ | 5.0 – 10.0 m³ | 12.0 – 20.0 m³ | 25.0 – 50.0 m³ |
| Motor Power (kW) | 7.5 – 15 kW | 22 – 45 kW | 55 – 90 kW | 110+ kW |
| Operating Voltage | 380V – 440V | 380V – 440V | 440V – 690V | High Voltage (HV) |
| Cycle Time (Closing) | ~ 8 Sec | ~ 12 Sec | ~ 18 Sec | ~ 25 Sec |
| Hydraulic Pressure | 180 Bar | 220 Bar | 280 Bar | 320+ Bar |
| Ingress Protection | IP55 / IP66 | IP66 | IP66 (Marine Grade) | IP67 |
How It Operates
The operation follows a ‘drive drive’ hydraulic sequence.
Lowering: The grab is lowered onto the material.
Activation: The operator pushes a button in the cab and sends electricity by cable reel to grab the motor.
Pressure Build: The motor spins the pump, forward oil “full bore” side of the cylinders.
The Dig: The jaws close with constant hydraulic force, regardless of whether the material is hard, and a hydraulic relief valve prevents the motor from stalling.
Hoisting: The crane lifts the grab, and its design, hydraulic valve, and cylinder ensure the grab doesn’t open mid-air if power is lost.
Technical FAQ
Q: Why use an electro-hydraulic grab instead of a mechanical one?
Ans: Both operate differently, while electro-hydraulic grabs maintain the 100 % force throughout the entire closing and mechaical loose the power when they close. Also, many companies offers 100% water proof electric grabs for underwater operation.
Q: What is the most critical maintenance item?
Ans: The cable reels because the grab moves up and down constantly, and the cable handles the high load.
