What is the difference between the mechanical grabs and the hydraulic grabs?In terms of material handling, choosing the right grab can significantly affect efficiency and productivity.The two common types of grapple used in cranes are mechanical grapple and hydraulic grapple.Let’s explore their differences and understand when to choose each type.

First of all, let’s take a look at what is a hydraulic grab and a mechanical grab：

Classification

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Working principle

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Aplicativo

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Manutenção

The hydraulic grabs of the crane is controlled by a hydraulic system, which has the advantages of high precision and flexible operation. It is suitable for loading and unloading bulk cargo and occasions that require fine operation, but its structure is complex and the maintenance cost is high. The mechanical grabs relies on wire rope control, which is suitable for handling large pieces of materials and heavy-duty operations in harsh environments. The structure is relatively simple and the maintenance cost is low. When choosing, the type of grab to use should be determined according to the operation requirements, accuracy requirements, and operating environment.

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Como escolher a garra certa

Esclareça seu propósito:before delving into the options, please clarify your specific requirements.Ask yourself：

• Com quais materiais você quer lidar? (Toras, sucata, pedra, etc.)

• Quais tarefas a garra executará? (Carregamento, classificação, desmontagem, etc.)

• A que tipo de dispositivo ele será conectado? (Ponte rolante, ponte rolante)

• Qual é a gravidade específica do material que você pega? O número de cubos da garra?

• De acordo com as características do material a ser agarrado, o agarrador é geralmente dividido em quatro tipos básicos: leve, médio, pesado e superpesado.

O tipo de material a ser agarrado	Pegue o material	Capacidade de peso (t/m³)
Luz	Coque, escória, grãos, batatas, cal antracita de média qualidade, cimento, solo, cascalho, argila, tijolos quebrados, etc.	0.5~1.2
Médio	Turfa, grandes pedaços de carvão antracito, carvão compactado, argila, calcário, cascalho, sal, brita, tijolos, bauxita, flocos de óxido de ferro, cimento, areia e tijolos em água, etc.	1.2~2.0
Pesado	Calcário, argila pesada, minérios pequenos e médios, rocha dura, óxido de ferro em forma de barra, minério de ferro, pó de concentrado de chumbo, etc.	2.0~2.6
Sobrepeso	Minérios grandes, minério de manganês grande, pó de minério de chumbo aglomerado sedimentar, etc.	2.6~3.3

• Qual é a tonelagem do seu guindaste equipado com uma garra?

Compatibilidade de acessórios: Certifique-se de que o gancho seja compatível com o equipamento existente.

Considerações orçamentárias: A faixa de preço do grab é diferente. Equilibre seu orçamento com base na função e durabilidade do grab.

Comentários e sugestões: Pesquise online, leia avaliações de usuários e busque sugestões de colegas do setor.

Vá até o fabricante do guindaste para inspeção e testes no local antes de comprar: teste o grab em condições reais o máximo possível. Avalie seu desempenho, facilidade de uso e funcionalidade geral.

Tenha em mente que escolher a garra certa requer um equilíbrio entre funcionalidade, segurança e custo. Ao considerar esses fatores, você encontrará a garra perfeita que pode aumentar a produtividade e garantir uma operação suave.

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Choose the appropriate hydraulic grabs and mechanical grabs according to the needs of different projects

We use 2 previous Dafangcrane projects to help you distinguish the selection.

Case1-Hydraulic grabs are used on overhead cranes

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• Grab type: Electro Hydraulic Orange Peel Grabs , grab volume 4m³*A6 

• Tipo de projeto: Usado em projetos de geração de energia residual, principalmente para lidar com a mistura, despejo, manuseio, mistura, etc. de resíduos domésticos para garantir uma composição uniforme dos resíduos. Lida com 600t de lixo por dia; a operação do equipamento é superior a 8000h.

• Características do material: 

• O teor de umidade dos resíduos domésticos é de 45%~65%

• A densidade do lixo na garra é de 0,6~0,9t/m3

• Capacidade de lixo (no compartimento de lixo) 0,3~0,6t/m3

• Ângulo de acumulação estática 65 graus

• Price reference： The hydraulic grabs are more intelligent and more complex than the mechanical grab, so the price is 4.1 times that of the mechanical claw grab.

• Why choose hydraulic grabs：

Diversidade de materiais: The composition of domestic waste is complex, the moisture content is high, and the material diversity is rich, which requires a flexible grab for processing.The hydraulic grabs are multifunctional and can effectively handle materials of different types and states.

Compreendendo precisão e eficiência: The hydraulic grabs can accurately control the grasping force and angle, and adapt to the fine operations required in the garbage disposal process, such as mixing, dumping, handling and stirring, to ensure uniform garbage composition.

Forte capacidade de processamento: 600 toneladas de lixo são processadas por dia, e o equipamento funciona por até 8.000 horas. A durabilidade e o desempenho eficiente da garra hidráulica atendem às necessidades de operações de alta intensidade.

Segurança e estabilidade: The hydraulic grabs operates smoothly, which can reduce the risk of material spilling and operation, improve work safety, and is suitable for handling domestic waste with high moisture content and large density changes.

Adapte-se a ambientes operacionais complexos: The hydraulic grabs can maintain efficient operation in a changeable working environment, especially suitable for garbage disposal, which requires frequent operation and flexible response to various materials.

Operações de longo prazo e alta frequência: The durability and stability of the hydraulic grab enable it to cope with long-term and high-frequency operations, reduce downtime, and improve overall work efficiency.

In summary, the choice of hydraulic grab is based on its comprehensive considerations of flexibility, high efficiency, durability and safety, which can effectively meet the complex and high-intensity operation needs of waste power generation projects.

Case2-Mechanical grabs are used on overhead cranes

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• Grab type: Garras mecânicas de concha de quatro cordas para balde ,grab volume 4m³

• Gravidade específica do material: 2t/m³

• Tipo de projeto: Usado em empresas de materiais magnéticos de pó metálico, o cabo de aço adota o tipo de aço inoxidável resistente à temperatura.

• Price reference：The mechanical grab has a simple structure and costs about 24.39% of the hydraulic grab, making it the best choice if you are on a limited budget
• Why choose mechanical grab：

Good sealing: materials such as metal powder are easy to scatter during handling, and the mechanical grabs has a simple structure and good sealing, which can effectively prevent materials from spilling and improve the cleanliness and safety of operations.

Cost-effectiveness: The purchase and maintenance costs of mechanical grabs are low, and they are suitable for operations with limited budgets and long-term and high-frequency use.

Durabilidade: The grab wire rope adopts stainless steel temperature-resistant type, which is suitable for material handling such as metal powders that have high requirements for temperature and corrosion resistance.

Applicable environment: For metal powder in a dry state, the gripping force and stability of the mechanical grabs are sufficient to meet the needs, and the operation is simple and easy to maintain.

Work efficiency: The mechanical grab can quickly and efficiently complete the grabbing and handling of materials, improve the overall work efficiency, and is suitable for the rapid operation needs of industrial production lines.

In summary, the choice of mechanical grab is based on its comprehensive considerations of closure, cost-effectiveness, durability, applicable environment and operating efficiency, which can effectively meet the actual needs of metal powder magnetic material companies.

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Comprehensive comparison

It is recommended to choose mechanical grabs in the following cases：

• Harsh operating environment: In harsh environments with high dust and humidity, mechanical grabs are more reliable than hydraulic grabs and are less affected by environmental impact.

• Simplicity and cost-effectiveness are priorities: the mechanical grabs has a simple structure and low maintenance costs, which is suitable for projects with limited budgets.

• Easy maintenance: The mechanical grabs have a simple structure and a small maintenance workload, which can reduce downtime and improve operation continuity.

• Available equipment: If the existing lifting equipment does not have a hydraulic system, the mechanical grab can be used directly without additional modification or investment.

• Operation training: the operation of the mechanical grab is relatively simple, the training cost is low, and it is suitable for rapid deployment and use.

It is recommended to choose hydraulic grabs in the following cases：

• When greater gripping force is required: the hydraulic grabs are flexible in operation, the gripping force and angle can be accurately controlled, and the gripping force is stronger than that of the mechanical grabs.

• You operate hydraulic machinery: if you already have hydraulic equipment, the hydraulic grabs can be directly integrated to improve operating efficiency.

•  Safe and efficient material handling is essential: the hydraulic grabs operate smoothly, reduce material damage and operational risks, and improve work safety and efficiency.

• There are automation requirements: the hydraulic grab can be integrated with the automation control system to achieve more intelligent operations and improve the overall production efficiency.

In short, mechanical grabs and hydraulic grabs have their advantages in material handling. Evaluate your specific requirements, consider available equipment, and make an informed choice. Whether you choose the robustness and simplicity of the mechanical grabs or the accuracy of the hydraulic grabs, remember that the right grab can increase productivity and ensure smooth operation.

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Dafang Crane offers a wide range of hydraulic and mechanical grabs, including various types of automated grabs designed to meet diverse needs. Whether you’re looking for efficient solutions for heavy lifting or specialized applications, we have the right equipment for you. Click on the image link below to explore our full selection and find the perfect grab for your business needs.

15 caçambas de garra diferentes para aplicações de guindaste.