Rope Grabs
Rope Grabs DEMZ
DEMZ® mechanical rope grabs are manufactured in accordance with GOST 24599-87 and TU U 29.2-13425008-007 (HS Code: 8431410000). Grabs are essential handling equipment widely used in sea and river ports, metallurgical and mining/processing plants, coking and cement works, various quarries, and timber logging enterprises. The manufactured product range is designed for handling various bulk materials and scrap with bulk densities from 0.3 to 4.0 t/m³, featuring one to four ropes and lifting capacities ranging from 0.3 to 40 tons
Rope grabs are engineered for transport, stacking, loading, and unloading of bulk materials (coal, coke, ore, cement, sand, crushed stone, peat, grain crops, etc.), various metallurgical materials (scrap metal, furnace charge, scrap, turnings, pig iron ingots, etc.), timber, as well as certain types of piece cargo. They operate at ambient temperatures from -40°C to +40°C (GOST 15150-69) in non-corrosive environments free of chemically active gases, vapors, or dust that degrade metals and electrical insulation.
Consultation
Grabs Rope DEMZ
Rope grabs (see Fig.) are multi-jaw grab mechanisms engineered for loading and unloading trucks, railcars, vessels, and other cargo transports. Depending on operational requirements, the grab’s steel structure is fabricated from 09G2S, 10KhSND, and HARDOX (450, 600) steel grades. The grabs feature a reinforced upper crosshead 1 and lower crosshead 2. For ease of maintenance, ladders are provided on the grab arms 4. Synchronizer gears for scoop opening are enclosed within the sealed casing of the lower crosshead 2, preventing contact between the gear mesh and the handled material. The reeving (sheave) block baskets are removable. Sheave guards are installed on the reeving blocks to prevent the wire rope from jumping out of the groove during the loading of bulk materials, scrap metal, and other items. The pivot joints of the arms 4 and jaws 3 are mounted on spherical bearings, offering high durability, practical maintenance, and proven reliability in heavy-duty operations. Sealed rolling bearings are fitted inside the reeving sheaves, accompanied by protective end caps for extra defense against aggressive environmental elements. The plant continuously expands its grab lineup by reducing overall weight, engineering specialized grabs for bulk materials of varying densities, and utilizing wear-resistant steel alloys for critical components.
When equipment breaks down, foreign manufacturers often attribute failure to improper operation by the Customer, resulting in warranty denial — alongside the complex re-export procedures required for overseas repairs. Located in central Ukraine, our manufacturing plant can quickly resolve issues and restore equipment to operation. Our warranty coverage is 12 calendar months from the date of delivery, backed by post-warranty service support. The operational lifespan is at least 5 years. All equipment is engineered with a high safety factor, ensuring that harsh climatic conditions, rigorous duty cycles, or operator errors will not compromise your investment.
DEMZ® rope grabs comply with key regulatory and normative standards governing lifting equipment and mechanisms: HS Code: 8431410000; “NPAOP 0.00-1.80-18 (formerly NPAOP 0.00-1.01-07) Rules for Design and Safe Operation of Cranes, Lifting Mechanisms, and Equipment”; “KND 31.4.002-96 Regulations for Technical Operation of Material Handling Equipment in Seaports”; “RD 31.82.03-87 Occupational Safety Regulations in Seaports”
Rope grabs can be manufactured for specialized technological applications and operating conditions. In addition to standard models, we can design custom grabs tailored to the Customer’s specific needs or manufacture units based on the Customer’s existing technical drawings.
Cargo groups according to GOST 24599-87. Two-jaw rope grabs for bulk materials (suffixes following the main group designation: “т” – hard-to-penetrate; “л” – easy-to-penetrate; “с” – free-flowing; “лс” – highly free-flowing):
VL1–L2 (very light / light) – coal, coke, coal slag, grain, seeds, sugar, etc.
M1–M3 (medium) – sand, crushed stone, gravel, cement, coal screenings, metallurgical slag, chamotte, salt, sulfur, fertilizers, soil, etc.
H1–H2 (heavy) – bauxite, copper-nickel and iron ore concentrate, various types of ore, ferroalloys, etc.
VH1–VH2 (very heavy) – lead concentrate, etc.
Cargo groups according to GOST 24599-87. Multi-jaw rope grabs for scrap metal (suffix following the main group designation: “то” – irregularly shaped or elongated elements):
L2to – unsorted light scrap metal
M3to – unsorted scrap metal, predominantly lump or baled
H2to – sorted heavy lump or briquetted scrap metal
H2to – pig iron ingots
Consultation
Technical Features:
- High performance and operational stability
- High-strength, heavy-weld seams with 100% ultrasonic testing
- Compliance with European and Ukrainian standards
- High reliability, durability, and reinforced structural design
- Custom design capability and advanced materials
- Ease of operation and maintenance, quick installation, and fast adaptation
- Accompanying technical documentation — product passport, operating manual, service logbook, and technical regulations
- 1-year warranty, 5-year service life
- Technical support during and post-warranty periods
- Tailored approach fulfilling Customer specifications
Table. DEMZ® Mechanical Rope Grabs according to GOST 24599-87 and TU U 29.2-13425008-007
| Grab Type | Crane Cap., t | Weight, kg | Geometric Capacity, m3 | Rope Dia., mm | Reeving Ratio | No. of Jaws | Density, t/m3 | Handled Material |
| For handling grain and coal | ||||||||
| 5-Л1с-В | 5 | 2200 | 3.5 | 24 | 4 | 2 | 0.7-0.8 | Grain |
| 5-Л2-В | 5 | 2080 | 3 | 24 | 4 | 2 | 0.8-1.0 | Coal |
| 10-Л1-Пр-В | 10 | 4800 | 6.8 | 24 | 4 | 2 | 0.6-0.8 | Grain |
| 10-Л1-Пр-В | 10 | 4500 | 6.9 | 24 | 3 | 2 | 0.6-0.8 | Grain |
| 10-Л2-Пр-В | 10 | 4100 | 5.3 | 24 | 3 | 2 | 0.8-1.0 | Coal |
| 10-Л2-Пр-В | 10 | 4980 | 5.3 | 24 | 4 | 2 | 0.8-1.1 | Coal, grain |
| 10-Л2с-Пр-В | 10 | 4800 | 7 | 24 | 3 | 2 | 0.6-1.0 | Grain |
| 16-Л2-Пр-В | 16 | 6235 | 9 | 28 | 3 | 2 | 0.8-1.0 | Coal |
| 25-Л2с | 25 | 9600 | 15.2 | 32 | 4 | 2 | 0.8-1.0 | Grain |
| 30-Л2с | 30 | 11200 | 21 | 36 | 4 | 2 | 0.6-0.8 | Grain |
| For handling scrap metal | ||||||||
| 5-Т2то-М-В | 5 | 2500 | 0.5 | 24 | 5 | 8 | 2-3.2 | Scrap metal |
| 10-С3то-М | 10 | 5640 | 1.6 | 24 | 5 | 6 | 1.8-2.7 | Scrap metal |
| 10-Т2то-М-В | 10 | 5300 | 0.9 | 21 | 4 | 6 | 2.5-3.2 | Pig iron ingot |
| 10-Т2то-М-В | 10 | 5100 | 1.2 | 24 | 5 | 6 | 2.5-3.2 | Scrap metal |
| 16-Т2то-М | 16 | 7400 | 2.6 | 28 | 4 | 8 | 2.5-3.2 | Scrap metal |
| 16-Т2то-М | 16 | 7550 | 2.65 | 28 | 4 | 6 | 2.5-3.2 | Pig iron ingot |
| 20-Т2то-М | 20 | 9330 | 3.75 | 28 | 4 | 8 | 2-3.2 | Scrap metal |
| 25-ВТ1т-М | 25 | 12300 | 4.1 | 32 | 4 | 6 | 2.2-3.7 | Pig iron ingot |
| For handling sulfur, mineral fertilizers, sand, clay, etc. | ||||||||
| 5-С2-4к-В | 5 | 1750 | 2.2 | 15 | 4 | 2 | 1.25-1.45 | Sand |
| 5-С3л-В | 5 | 1900 | 1.8 | 24 | 4 | 2 | 1.6-1.8 | Sand, clay |
| 5-Т1-В | 5 | 2000 | 1.8 | 24 | 4 | 2 | 1.6-1.8 | Sand, clay |
| 10-С2-Пр-В | 16 | 3560 | 4.6 | 24 | 4 | 2 | 1.4 | Sulfur, potassium chloride |
| 10-С3-Пр-В | 10 | 4000 | 3.45 | 24 | 4 | 2 | 1.75 | Clay |
| 10-С3-Пр-В | 10 | 3700 | 3.5 | 24 | 4 | 2 | 1.6-2.0 | Clay |
| 16-С1л-Пр-В | 16 | 6100 | 8 | 28 | 3 | 2 | 1.0-1.2 | Sulfur, kaolin |
| 16-С2-Пр-В | 16 | 6000 | 7 | 28 | 3 | 2 | 1.25-1.6 | Sand, sulfur |
| 16-С2-Пр-В | 16 | 6250 | 6.2 | 28 | 4 | 2 | 1.6 | Clay, sulfur |
| 16-С3-Пр-В | 16 | 6190 | 5.2 | 28 | 4 | 2 | 1.5-1.9 | Sand, crushed stone |
| 25-С2с | 25 | 10000 | 10.7 | 36 | 4 | 2 | 1.4 | Lumpy sulfur |
| 30-С3т | 30 | 9100 | 9 | 36 | 4 | 2 | 1.5-1.9 | Clay |
| For mining and metallurgical cargoes | ||||||||
| 5-Т1-1к | 5 | 1500 | 1.3 | 16 | 3 | 2 | 1.8-2.4 | Sludge |
| 5-Т2-В | 5 | 1900 | 1.4 | 24 | 5 | 2 | 2.5-3.2 | Ore |
| 5-С3-В | 5 | 2249 | 1.5 | 13.5 | 3 | 2 | 1.8 | Ore, slag |
| 8-Т2-т | 8 | 2900 | 1.8 | 18 | 3 | 2 | 2.1-2.8 | Sludge |
| 10-Т1-Пр-В | 10 | 3945 | 2.8 | 24 | 4 | 2 | 2.0-2.5 | Ore |
| 10-Т2-Пр-В | 10 | 3680 | 2.4 | 24 | 4 | 2 | 2.5-3.2 | Ore, pellets |
| 10-С3-В | 10 | 3750 | 3 | 18 | 4 | 2 | 1.5-1.9 | Ferroalloys |
| 10-Т2-В | 10 | 4860 | 1.6 | 18 | 6 | 2 | 2.5-3.0 | Ore, slag |
| 10-С3л-Пр-В | 10 | 6140 | 2 | 24 | 3 | 2 | 1.7 | Ore, slag |
| 10-С2-В | 10 | 5050 | 3 | 17 | 5 | 2 | 1.25-1.8 | Ore, slag |
| 15-С2-В | 15 | 8560 | 2.5 | 21 | 5 | 2 | 1.25-1.6 | Slag |
| 16-Т1-Пр-В | 16 | 5660 | 4.2 | 28 | 4 | 2 | 2.0-2.5 | Ore |
| 16-Т2-Пр-В | 16 | 5600 | 3.5 | 28 | 4 | 2 | 2.5-3.2 | Ore, pellets |
| 16-ВТ1 | 16 | 7500 | 2.6 | 25 | 6 | 2 | 3.0-3.2 | Slag processing |
| 16-Т2т | 16 | 5300 | 4 | 24 | 5 | 2 | 2.0-2.6 | Sludge |
| 20-Т1 | 20 | 8456 | 3.2 | 27 | 6 | 2 | 2.15 | Concentrate |
| 30-С3 | 30 | 13253 | 8 | 33 | 5 | 2 | 1.6-2.0 | Sinter |
| 30-С2 | 30 | 14800 | 13.2 | 33 | 5 | 2 | 1.25-1.3 | Granulated slag |
Model Designation for DEMZ GK Series Rope Grab.
Example: GK-10-3.2-_-M3t-Pr-V
- G = grab,
- K = rope mechanism,
- 10 = Q – min. allowable crane capacity, t,
- 3.2 = V – grab capacity, m3,
- -_- = 2-jaw (clamshell) (multi-jaw is designated by the letter M),
- M3t = granite cobblestone, material bulk density for handling γ ≤ 2.1 t/m3,
- Pr = jaw opening orientation (longitudinal),
- V = railcar clearance application.
We will be glad to assist you in selecting the grab best suited for your production needs.
We look forward to receiving your inquiries.
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Frequently Asked Questions (FAQ)
The lifting capacity of an electromagnet is the maximum load weight permitted to be lifted and moved by the magnet. It typically equals 0.5 of the breakaway (tear-off) force, providing a safety factor for secure operation.
The lifting capacity depends on the magnitude of the magnetic flux in the core. The flux increases as the magnetomotive force increases and as the magnetic reluctance of the circuit decreases.
Copper coils cost twice as much as aluminum ones; copper has 1.7 times higher conductivity than aluminum; copper density is 3.3 times higher than aluminum; copper’s specific heat capacity is 3 times lower than aluminum’s; copper coils offer more repair cycles and a longer service life than aluminum.
Welded steel housings are simple and cost-effective to produce. The advantages of a cast magnetic core over a welded one include cooling fins, greater operational durability, solid structural integrity, and the complete absence of internal air gaps.
Overheating, lower density of scrap metal, switching to metal stock with larger air gaps, and malfunctions in the control cabinet (voltage converter).
Improper operation (faulty control cabinet, overheating, moisture exposure, overvoltage), coil-to-housing breakdown (ground fault), open-circuit/broken conductors, and inter-turn short circuits within the coil.