Shanghai ENJUE Machinery Equipment Co., Ltd is one of the most experienced manufacturers and suppliers of mechanical scissor grab in China. If you're going to buy custom mechanical scissor grab made in China, welcome to get more information from our factory. For price consultation, contact us.
What is a mechanical scissor grab?
The mechanical scissor grab is a purely mechanical grab that relies on four wire ropes that are wound in a special way to provide power to the grab and control the opening and closing of the grab.
Structure Composition
Mechanical scissor grab usually consists of a jaw plate, hinge shaft, connecting rod, pulley set, balance frame, and other parts.
The jaw plate is the part that directly grabs the material, the hinge shaft is used to connect the parts and provide the rotating pivot point, the connecting rod transmits the force and movement, the pulley set is used to change the direction and size of the force, and the balance frame ensures the balance and stability of the grab when it is working.
Advantages and features
- Conforms to quality management standards ISO, e.g. ISO 9001, ISO 9004, CE, etc.
- Comply with the inspection standards of classification societies, such as: CCS, ABS, LR, RINA, RMRS, DNV, etc.
- Purely mechanical construction;
- No hydraulic or electrical systems required;
- Can be used for both underwater dredging and land-based operations;
- High reliability and low maintenance cost;
- Simple operation, through the control of lifting equipment, can complete the gripping and releasing action;
- The scissor grab can be opened to a near horizontal position, bringing the grab closer to the hopper or conveyor chute;
- Lighter weight, which minimizes the load;
- Different shapes and sizes of jaws can be designed according to different materials and working conditions, with strong adaptability.
- Accept non-standard customisation
3D Design Models
The whole grab is designed by CAD and other software, and the steel structure is calculated and analysed by FEM finite element to ensure the stability of each structure.
Main Technical Parameter
Parameter table into the display part of the parameters, Enjue grab more models and details of the data can be contacted customer service personnel, find Enjue professional and technical team consulting.
| Type | Hook SWL(t) | Grab Volume(m3) | Deadweight(t) | Size(mm) | ||||
| A | B | C | D | E | ||||
| EJMSGB10.0-7.8-3.8 | 10.0 | 7.8 | 3.8 | 3962 | 4310 | 2700 | 4511 | 2865 |
| EJMSGB12.5-9.6-4.8 | 12.5 | 9.6 | 4.8 | 4324 | 4683 | 2841 | 4828 | 3010 |
| EJMSGB20.0-15.5-7.6 | 20.0 | 15.5 | 7.6 | 5204 | 5627 | 3225 | 5642 | 3402 |
| EJMSGB25.0-19.4-9.5 | 25.0 | 19.4 | 9.5 | 5363 | 5842 | 3526 | 6020 | 3672 |
| EJMSGB32.0-24.0-12.8 | 32.0 | 24.0 | 12.8 | 5960 | 6480 | 3800 | 6560 | 3820 |
| EJMSGB40.0-30.2-16.0 | 40.0 | 30.2 | 16.0 | 6630 | 7220 | 4180 | 7170 | 4050 |
Working principle
A mechanical scissor grab relies on the movement of the mechanical structure to achieve the gripping and releasing action.
As the hoist applies force to the grapple via the wire rope or other connecting device, the pulley set drives the linkage movement, which in turn causes the jaw plate to rotate about the hinge axis, achieving closed gripping of the material.
When the force is released or reversed, the jaw plate opens under the action of gravity or other resetting devices to release the material.
Application scenario
Construction Industry: The mechanical scissors grab is used for gripping and transporting building materials such as bricks, blocks, and stones.
Port Terminals: The scissor grab bucket is applied in loading and unloading bulk cargo and general merchandise.
Mining Industry: Scissor grabs are employed for handling ores, coal briquettes, and similar materials.
Timber Processing Industry: The scissors grab serves for gripping and transporting logs, boards, and other timber products.
FQA
Q1: What materials can a clamshell grab handle? Clamshell grabs adapt to diverse bulk materials, including coal, iron ore, bauxite, limestone, sand, gravel, grain, fertilizer, cement clinker, solid waste, recycled materials and dredged sediment. The material type defines the grab's shell structure, cutting edge design, wear plate setup and closing force. Standard designs fit common granular materials, while customized shell shapes and stronger closing forces handle wet, sticky materials to avoid bridging and adhesion.
Q2: What is the difference between a clamshell grab and an orange peel grab? These two grabs differ in structural design and application scope. The clamshell grab adopts two top-hinged shells, specializing in loose, free-flowing granular bulk materials for port and industrial handling. The orange peel grab uses multiple radial curved shells, ideal for irregular, interlocked materials such as scrap metal, demolition waste and logs for recycling and scrap yard operations.
Q3: What is a hydraulic grab bucket? A hydraulic grab bucket is a high-precision crane attachment driven by hydraulic cylinders instead of traditional rope tension. It allows flexible adjustment of opening range, closing force and discharging status at any lifting position for accurate operation. Although heavier and more expensive than mechanical grabs, it delivers superior stability and precision with an integrated electro-hydraulic structure that only requires basic crane power supply.
Q4: Which cranes are compatible with clamshell grabs? Clamshell grabs are universally compatible with overhead cranes, gantry cranes, harbor cranes, ship unloaders, floating cranes and crane barges. The supporting crane must meet the rated safe working load to carry the total weight of the grab and materials with a proper safety margin. Mechanical grabs fit standard rope hoist systems, while hydraulic grabs need matched power or hydraulic supply for normal operation.
Q5: Can a clamshell grab be customized? Full professional customization is available for all clamshell grab models to suit unique working conditions. Customizable items include grab capacity, shell geometry, opening width, cutting edge type, wear plate thickness, marine anti-corrosion treatment, hydraulic configurations and structural reinforcement. All customized solutions optimize the grab for specific materials, cranes and environments to boost overall performance and service life.
Q6: What are the advantages of mechanical rope-driven clamshell grabs? Mechanical rope-driven clamshell grabs operate purely by crane rope tension without hydraulic or electric parts. They feature a simplified integral structure, extremely low failure rate and minimal daily maintenance requirements. Compared with hydraulic grabs, they offer lower purchase cost, better structural durability and higher stability for cost-effective medium and low-frequency bulk material handling work.
Hot Tags: mechanical scissor grab, China mechanical scissor grab manufacturers, suppliers, factory, noise reduced grab bucket, marine nuts, telescopic grab bucket, marine rudders, marine sunshades, marine sealants
