Four rope clamshell grab bucket
Bulk cargo materials
Rated lifting capacity: 5.0T-80T
Density: 0.6-3.2t/m³
OEM & ODM accept
Four rope clamshell grab bucket is a kind of lifting equipment with excellent performance, which consists of bucket body, upper bearing beam, lower bearing beam, spreader bar and balance frame. Double flap means that there are two mutually symmetrical bucket bodies. Four-rope means that the work of the grab is controlled by four wire ropes, two of which are hung on the rope guide device (balance frame) on the upper bearing beam and are called support ropes; and the other two are connected with the wire ropes wrapped around the grab pulley block and are called closure ropes.
Features:
1.The four rope clamshell grapple has a unique four-rope structure that provides great stability and reliability for gripping operations.
2.The double-flap design can be closed precisely to grip all kinds of materials tightly.
3.The overall structure of the grapple is lightweight and durable, with high gripping rate, high closing force and high material loading rate.
Applications:
Four rope clamshell grab bucket is mainly used in conjunction with harbor cranes, deck cranes, ship unloaders and other cranes with two sets of hoisting reels, and is used to grab various bulk cargoes with uniform granularity for loading, unloading and transferring piles of material and other operations, such as grains, coals, cements, sulphur, mineral powders, ore, etc. It is widely used in the fields of harbor, iron and steel plants, power stations and ships.
Design drawings
We can design and produce cranes according to the operational scenarios and specific requirements, accept non-standard customization, and customers can also choose the required functions according to their requirements.
Main technical parameters:
Material density: 0.6~0.8(t/m3) Grain size up to <30mm
| Crane lifting capacity (t) |
3 |
5 |
6 |
8 |
10 |
12.5 |
16 |
20 |
25 |
32 |
40 |
50 |
| Grab volume ( 45 Doma) m3 |
2 |
3.6 |
4.2 |
5.6 |
10 |
9 |
12 |
14 |
18 |
22 |
28 |
35 |
| Deed weight (t) 3-fold |
1.3 |
2.1 |
2.6 |
3.4 |
0.3 |
5.2 |
6.3 |
8.7 |
10.3 |
14 |
17.2 |
21.6 |
| Deed weight (t) 4-fold |
1.4 |
2.2 |
2.7 |
3.5 |
4.4 |
5.3 |
6.4 |
8.8 |
10.6 |
14.4 |
17.6 |
22 |
| Dimensions (mm) |
A |
2580 |
3120 |
2320 |
3830 |
4080 |
3790 |
4290 |
4570 |
4920 |
5330 |
6400 |
7120 |
| B |
3050 |
3680 |
3360 |
4470 |
4770 |
4540 |
5100 |
5450 |
5865 |
6400 |
7500 |
8380 |
| C |
1850 |
2330 |
2320 |
2520 |
2715 |
2925 |
3180 |
3420 |
3690 |
4000 |
4320 |
4650 |
| D |
2530 |
3180 |
3170 |
3440 |
3700 |
3990 |
4335 |
4670 |
5030 |
5460 |
5890 |
6340 |
| E |
1860 |
2340 |
2340 |
2540 |
2730 |
2945 |
3200 |
3440 |
3710 |
4030 |
4345 |
4680 |
| Cable specification Φ (mm) |
13.5 |
16 |
17.5 |
19.5 |
21.5 |
24 |
26 |
28 |
32 |
36.5 |
40 |
44 |
| Sheave diameter Φ(mm) |
320 |
400 |
445 |
445 |
3180 |
560 |
650 |
710 |
820 |
920 |
1120 |
1210 |
Note: The data in the table is for reference only, we accept non-standard customisation, please consult our salesman for details.
Difference between single-rope grabs, double-rope grabs and four-rope grabs:
Single rope grabs are often used on cranes with hooks;
Double rope grabs need to be equipped with customized double reels on cranes;
Four-rope grabs have an additional set of closing ropes and support ropes compared to double-rope grabs, which can make the structure of the grab more stable and less prone to spinning.
Working Principle:
The crane's two sets of reels release four wire ropes, two of which are connected to the balance frame of the grab's upper bearing beam (called as support ropes), and the other two are connected to the two wire ropes wrapped around the grab's pulley block (called as opening and closing ropes).
1. Grab down: the support rope lifts the grab to the appropriate position, and then drop the opening and closing ropes, the grab relies on the self-weight of the lower crossbeam, so that the bucket part of the lower crossbeam axis as the center of the bucket will be opened, when the bucket is opened to the two lugs of the plate and the collision block, that is, the bucket is opened to the maximum limit.
2. Grab grabbing material: after the grab is opened, the crane moves the grab to the top of the material to be grabbed, and then drops the support rope and the opening and closing ropes at the same time, so that the grab falls on the material. Then, the reel collects the opening and closing ropes, so that the bucket body of the grapple closes and grabs the material.
3. Grab rising: after grabbing the material, the reel lifts the support rope and opening/closing rope at the same time, and lifts the grab.
4. Grab unloading: after the grab is lifted to the unloading position, the reel drops the opening and closing ropes, so that the grab's bucket is opened and the material is unloaded.
Important
It is important to understand the intended application of the grapple you need. Below is a list of general topics we will discuss in order to accurately manufacture a marine grab to your specifications.
* What do you intend to lift with the grab?
* What is the bucket capacity you need?
* What is the power of the motor you want?
* What is the specific gravity of the material you expect?
* What type of grab are you interested in?
* What are your environmental conditions? For example, temperature, humidity, etc.
* What kind of control device do you need?
* What is your preference for the drive system, electric or diesel hydraulic?
* Do you want a single rope, double rope, or quadruple rope, or other?
* What is your preferred number of bucket flaps?
FAQ
Q1: What's the information should I provide when inquiry?
A: Thanks for your question. The more information you provide, the more accurate solution we can prepare for you! The information such as the lift capacity, span, lift height, power source or other specials you give us will be more appreciated.
Q2: Is your products customized?
A: Yes, because of the different working condition, all our products are customized depending on detail requirement! So if you give us more information about the lift capacity, span, lift height, power source and other specials, we will give you a very quick quote!
Q3: How can we install the grab?
A: Our senior engineer can be your side to provide the installation guide service and training.
Q4: Can you provide the serious lifting tools?
A: Sure, we can provide any lift tools such as lift sling belt, lift clamp, grab, magnet or other specials as your requirement!
Q5: How about your payment terms?
A: we accept T/T and L/C at sight.
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