天井クレーンの機械式グラブと油圧式グラブ: どちらがニーズに最も適していますか?

2024年11月19日

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

Overhead Crane Hydraulic Grabs

Electro Hydraulic Orange Peel Grabs
電動油圧式クラムシェルグラブ
 電気油圧式長方形グラブ
Hydraulic Round Nose Bucket

Overhead Crane Mechanical Grabs

機械式4ロープクラムシェルグラブバケット
 機械式4ロープオレンジピールグラブ
 機械式2ロープクラムシェルグラブ
 シングルロープグラブバケット

Working principle

Overhead Crane Hydraulic Grabs

A set of lifting mechanisms, the hydraulic grab is installed under the hook using a hook, which is easy to disassemble, and the telescopic action of the hydraulic cylinder completes the opening and closing of the bucket.

It has a motor, a hydraulic pumping station, and a control valve, which is driven by an external power supply to open and close.

The hydraulic grabs are connected to the hydraulic circuit on the crane.

The operator can control the lifting, opening and closing, transfer and other actions of the hydraulic grab in the control room.

Enlarge image: 1 mechanism","alt":"1 mechanism"}" data-wp-interactive="core/image" class="wp-block-image size-full wp-lightbox-container">

Overhead Crane Mechanical Grabs

It needs to be equipped with 2 sets of lifting mechanisms to open and close the mechanical grabs through the reel.

The mechanical grabs relies on mechanical connecting rods, pulleys, and levers for grasping action

Operated by direct physical force, it consists of two or more hinged arms with sharp or serrated edges, similar to the jaw of a creature, which can tightly clamp the material.

No hydraulic power or electrical connection is required. The operator manually controls the movement of the mechanical grab.

Enlarge image","alt":""}" data-wp-interactive="core/image" class="wp-block-image size-full wp-lightbox-container"> 2 mechanisms

応用

Overhead Crane Hydraulic Grabs

Domestic waste treatment：

Grab cranes used in waste disposal in domestic waste incineration and power generation projects mainly grab domestic waste.

This is an intelligent product that can realize unattended operations.

Scrap steel and large stones：

In scrap yards and stone processing plants, materials of various shapes and sizes can be precisely controlled and efficiently processed.

Old battery：

It is more suitable for fine operation and accuracy, and reduces the risk of battery damage.

Food processing industry：

Grab pickles, pickles, and wineries for brewing.

Stainless steel is usually used to reduce pollution.

River decontamination：

It is very suitable for fine cleaning tasks, providing precise control to remove debris without disturbing the riverbed too much.

Light industry：

Grasping plastics is very suitable for high-precision processing of plastics, suitable for classification and fine operation.

Enlarge image","alt":""}" data-wp-interactive="core/image" class="wp-block-image size-full wp-lightbox-container"> Application 1

Overhead Crane Mechanical Grabs

Waste treatment and classification：

Mechanical grappling hooks are good at handling bulk materials such as logs, scrap metal, rocks and debris.

Waste management facilities use grabs to sort and transfer recyclables, green waste, and construction waste.

Dismantle and deconstruct：

During the demolition project, the mechanical grab removes the building structure by grabbing and pulling the material.

The removal of concrete, steel beams and other components minimizes the need for labor and shortens the project schedule.

Loading and unloading：

The grab can effectively handle bulk cargo such as coal, grain and aggregates.

Forestry operations：

Efficiently load and unload logs to assist in the logging and transportation of wood.

They keep operators away from fallen trees and heavy logs, thereby improving safety.

Enlarge image","alt":""}" data-wp-interactive="core/image" class="wp-block-image size-full wp-lightbox-container"> Application2

メンテナンス

Overhead Crane Hydraulic Grabs

The hydraulic system has many mechanisms, and the maintenance is more cumbersome than the mechanical grabs.

The hydraulic system is more complex and the maintenance cost is higher, and it is prone to air intake and other failures during use.

Overhead Crane Mechanical Grabs

Compared with hydraulic grabs, mechanical grabs are simple to maintain and durable. Mechanical grabs are usually just a matter of wire rope wear. At that time, only the wire rope needs to be replaced.

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.

適切なグラブの選び方

目的を明確にする：before delving into the options, please clarify your specific requirements.Ask yourself：

どのような資材を扱いたいですか？（丸太、金属くず、石材など）

グラブはどのような作業を実行しますか?(積載、仕分け、解体など)

どのような装置に接続されますか？（ガントリークレーン、オーバーヘッドクレーン）

掴む物の比重はどれくらいですか？掴む物の立方体の数は？

掴む材料の特性に応じて、グラブは通常、軽量、中量、重量、超重量の 4 つの基本タイプに分けられます。

つかむ材料の種類	素材を掴む	容量重量(t/m³)
ライト	コークス、スラグ、穀物、ジャガイモ、中質無煙炭、セメント、土、砂利、粘土、壊れたレンガなど。	0.5~1.2
中くらい	泥炭、無煙炭の大きな塊、圧縮石炭、粘土、石灰岩、砂利、塩、砂利、レンガ、ボーキサイト、酸化鉄の薄片、セメント、水中の砂とレンガなど。	1.2~2.0
重い	石灰岩、重粘土、小・中鉱石、硬岩、棒状酸化鉄、鉄鉱石、鉛精鉱粉末など。	2.0~2.6
太りすぎ	大型鉱石、大型マンガン鉱石、堆積性凝集鉛鉱石粉末など	2.6~3.3

グラブを装備したクレーンのトン数はどれくらいですか?

アクセサリの互換性: グラブが既存の機器と互換性があることを確認します。

予算に関する考慮事項: グラブの価格帯はさまざまです。グラブの機能と耐久性に基づいて予算のバランスをとってください。

コメントと提案: オンラインで調査し、ユーザーのレビューを読み、業界の同業者からの提案を求めます。

購入する前に、クレーン製造元に現地検査とテストを受けてください。 可能な限り実際の条件下でグラブをテストします。そのパフォーマンス、使いやすさ、全体的な機能性を評価します。

適切なグラブを選択するには、機能性、安全性、コストのバランスを取る必要があることに留意してください。これらの要素を考慮することで、生産性を向上させ、スムーズな操作を保証できる最適なグラブを見つけることができます。

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

Enlarge image","alt":""}" data-wp-interactive="core/image" class="wp-block-image size-full wp-lightbox-container">

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

プロジェクトの種類：廃棄物発電プロジェクトに使用され、主に家庭廃棄物の混合、投棄、処理、混合などを処理し、廃棄物の組成を均一にするために使用されます。1日あたり600tのゴミを処理し、設備の稼働時間は8000時間を超えます。

材料特性:

家庭ごみの水分含有量は45%～65%

グラブ内のゴミの密度は0.6〜0.9t/m3

ゴミ容量（ゴミ収容部）0.3～0.6t/m3

静的蓄積角度65度

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：

素材の多様性: 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.

把握の精度と効率: 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.

強力な処理能力: 1 日に 600 トンのゴミが処理され、機器は最大 8,000 時間稼働します。油圧グラブの耐久性と効率的なパフォーマンスは、高強度作業のニーズを満たします。

安全性と安定性: 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.

複雑な動作環境に適応: 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.

長期かつ高頻度の運用: 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

Enlarge image","alt":""}" data-wp-interactive="core/image" class="wp-block-image size-full wp-lightbox-container"> Mechanical grab is used on overhead cranes

Mechanical grab is used on overhead cranes

Grab type: 機械式4ロープクラムシェルグラブバケット ,grab volume 4m³

材質比重：2t/m³

プロジェクトタイプ：金属粉末磁性材料会社で使用されるグラブワイヤーロープは、ステンレス鋼耐熱タイプを採用しています。

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.

耐久性: 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.

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.

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.

クレーン用途の 15 種類のグラブバケット.