Grab Overhead Cranes has a lifting capacity of around 1 to 25 tons together with the weight of the grab bucket, which is widely used in power stations, storage, workshop, and port to load and unload scattered objects.
| Type | QZ |
| Lifting Capacity | 1 to 25 tons |
| Lifting Height | Custom Height |
| Span | 6 to 35 m |
| Lifting Speed | 30.7-39.3m/min |
| Trolley Running Speed | 31.1-44.6m/min |
| Crane Running Speed | 76.9-93.6m/min |
| Working Duty | A6 |
Introduction
Using the grab bridge crane, you can lift heavy loads, and you can easily work in factories, shops, workstations, ports, etc. It is a heavy-duty loading material handling crane, in the QZ grab crane, it can free you from heavy work. The working performance of this heavy-duty bridge crane is higher than any other ordinary bridge crane, A6 working class, which can be used frequently in any working conditions. The platform direction of the driver’s cap is a side, end, and top. Its lifting capacity includes grade weight. The direction of the open grab bucket includes: parallel to the girder and parallel to the girder.
Grab overhead crane cranes are all heavy-duty systems.
All mechanisms of the grab overhead crane are operated in the driver’s cab, and the directions for entering the platform door of the driver’s cab are end entry, side entry, and jack entry.
The rated lifting capacity of the grab bucket overhead crane includes the white weight of the grab bucket.
There are two parallel vertical main beams in the opening direction of the grab.
What can we offer you?
We can provide you with the main Grab Overhead Cranes
Lifting weight 5 ton, 10 ton, 16 ton, 20 ton, 25 ton;
Span 6 m to 3 5m;
Lifting height 3m-30m;
Work level (A3, A4);
If we can’t satisfy you, we can customize it for you.
Features
Special lifting equipment for bulk and granular materials;
Simple structure, reliable, high efficiency;
Good production technology, long using life;
Large load capacity, high working duty;
Can choose different types of grab according to different kinds of materials.
WeiHuaCrane Advantages
- More professional service: If you are not sure how to customize, our sales manager will help you choose the most suitable product for you;
- Best for you: professional engineers customize products according to your user environment;
- Better price: According to your user environment, etc., we will give you the most suitable product, save unnecessary functions, and help you save money;
- Customized lifting height: According to your needs, the lifting height can be customized for you, which can be extended, reduced, etc., which is most suitable for you;
- Customized function: wireless remote control can be installed, which is more convenient to use;
- Modify the power supply: you can modify the power supply (voltage, frequency, etc.) according to your environment;
- On-site installation: Worried about installation errors, we can on-site installation and commissioning;
- Guidance: We provide use videos and detailed maintenance manuals;
- Replacement of vulnerable parts: more vulnerable parts are provided so that your crane can be replaced in the first time when it is worn out;
- Parts are processed separately: after long-term use, if some parts are damaged, we will process these parts for you and send them to you;
Application Scenarios
Grab overhead cranes are used for the loading and unloading of bulk materials in power plants, freight yards, workshops, docks, etc.
In the raw material preparation operations, operations such as unloading, stacking, reverse transportation, reclaiming, and loading can be carried out. Grab overhead cranes are widely used in the hoisting operations of general cargoes in various factories and mines, and the grab is a special spreader for special operations.
Main Structure
Mainly composed of 5 parts: bridge, trolley and crane traveling mechanism, electric equipment, grab, and other accessories.
Bridge
- Double girder, welding box beam, national standard camber;
- Q235 or Q345 steel material(same as Fe37 or Fe52 steel in abroad);
- The main weld adopt automatic submerged arc welding, NDT;
- End carriages contacting by high strength bolts and nuts, convenient in transportation;
- With the uniform, fine, bright, complete and consistent painting color;
- With painting thickness of 25～35μm each layer and whole thickness of 75～105μm.
Trolley
- Lifting mechanism is composed by motor, brake, coupling, transmission shaft, reducer, pulley blocks, wire rope, and other accessories;
- Crane dedicated YZR type wound motor, insulation class F;
- Closed Hydraulic push rod type brakes, which closed when machine not working, and opened by brake releases device when working;
- Roll casting reel, wire rope angle <3.5° , with 3 laps and 2 laps fixed circle at both ends of reel;
- Crane dedicated 6W(19) wire rope, line contact type, high strength, long life;
- Rotating limit switch set on spindle nose of the winding drum to keep the safe lifting;
- Specific Organization Chart
Crane Traveling Mechanism
- There are four traveling wheels installed on each side of the two end beams. Two of them are active wheels and the others are driven ones. The driving device of active wheels is installed on the walkway. Here adopt two sets of symmetrical independent driving devices and we call it respectively driven.
- The reducer adopts circular-arc gear one of which load capacity is higher than involute gear reducer of the same type. All of the mechanisms adopt rolling bearing with A.C. electromagnetic block brake.
- Driving devices include 1. Reducer; 2. Motor; 3. Brake; 4. Coupling; 5.Coupling; 6. Wheels, etc are shown in the mechanical drawing as follows:
- The contaction of the mechanism parts all adopt gear coupling. In this way, it can work well by gear coupling compensated even there is an error caused in manufacture and installation or deflection between the parts caused by bridge deformation when loading.
- Active and driven wheel axle support on the angular bearing box for easy assembly and maintenance.
Electric Equipment
- Electric control box layout is reasonable, easy to repair
- Security trolley line or angle steel trolley line
- External cable are equipped with mark line number
- Trolley moving’s power is supplied by flat cable
- The conductor is I steel or C shape sliding line
- Safety sliding touch line with high conductive rate and low pressure drop; current collector with high speed.
- Lifting and crane can be independently controlled; also can work separately or together.
Grabs
- Four-rope grab、double-rope grab
- Orange-petal grab、electric & hydraulic grabs
- Straw grab, wood grab, and other rich series varieties
Grab Crane Operating Principle
Grab is the lifting appliance using jaws open and close to load or unload the bulk materials.
According to the operating feature, grab can be divided into 3 kinds, double-rope, single-rope, and motor grab. The most commonly used is double-rope grab.
According to the packing density of the materials, grab can be divided into light (such as to crawl grain), medium (such as to crawl gravel), and heavy (such as to grab iron ore)
According to the jaw plate number, it can be divided into dual jaw plate grab and multitude jaw plate grab, the most commonly used is dual jaw plate grab
customers should adopt the multitude jaw plate grab to crawl the lump ores, scrap iron, and scrap because, with the characteristics of more claws and notch tip, it can easily insert the stockpile and do a good crawl.
The crane chooses the dual winding drums four rope grab as its crawl device, structure simple and reliable.
Mainly consisted of four parts: 1. head 2. Lifting beams 3. pull bar 4. bucket
Trolley equipped with lifting the winding drum and opening and closing winding drum, each set of rolls leads to two-wire rope, including two as a group in both ends of grab balance frame for support, and another set of wire rope going through the upper beam pulley and under beam pulley to form a pulley set, making bucket Ministry open and close.
When start working, grab lifting suitable position by support wire rope, then put down close wire rope, deadweight below lifting beam compels in the center of lifting beam below grab open the grab, when the two auricular plate collision, it is the max limit opened. When open grab, the center distance increased between uplifting beam pulley and down lifting beam, then drop the support wire rope, make the opened grab fall on the slack stack, and then furl close wire rope, make the center distance between uplifting beam pulley and down lifting beam pulley resume primary position, the course of snatch material has been finished. The closed grab fill full of material, at last lifting the close wire rope, the whole grab is lifted, the static crane is removed need yard, open grab unloads the snatch material.
7. Customers should highlight the requirements when crawling underwater materials or special materials and when using outside you should set rainproof devices.
Grab Bucket Double Girder Overhead Crane Parameters Table
| Capacity | 5 ton | 10 ton | 16 ton | 20 ton | |
| Span | S(m) | 10.5~31.5 | 10.5~31.5 | 10.5~31.5 | 10.5~31.5 |
| Lifting Height | m | 6~18 | 6~18 | 6~26 | 6~26 |
| Lifting Speed | m/min | 31.3 | 29.7 | 32.7 | 30.7 |
| Trolley Speed | m/min | 44.6 | 31.7 | 31.1 | 31.1 |
| Crane Speed | m/min | 93.6 | 86.5 | 75.1 | 76.9 |
| Work Duty | A5~A7 | A5~A7 | A5~A7 | A5~A7 | |
| Track Type | P43 QU70 | P43 QU70 | QU70 | QU70 |
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