Differentiating Technical Features of STEMM Grabs
1.- A WIDE RANGE OF CLAMSHELL GRABS AND ORANGE PEEL GRABS
Stemm offers one of the widest range of clamshell grabs and orange peel grabs based on a singular modular system for all components and parts. This innovating system allows us to optimize designs, processes and purchases as well as to perform many combinations.
2.-STRUCTURAL ROBUSTNESS, ELECTRIC AND HYDRAULIC POWER FOR A PROPER PENETRATION AND DRAGGING
The own grab weight, the geometry and an appropriate shell kinematic with a progressive profile, in combination with a strong cylinder action, allows an excellent filling coefficient, good load holding and maximum compaction.
3.- VERY QUICK EQUIPMENTS IN CLOSING AND OPENING: ACHIEVING GREAT PRODUCTION INCREASE
High pressure and variable speed pumps with regeneration and energy saving system. Pumps with splined shaft, low noise level and elastic couplings steel+nylon to guarantee maximum transmission. They also have double protection in order to avoid the sequential overpressure, without heating. The speed is adjusted automatically depending on density, humidity and granulometry of the material to be handled.
4.- SPECIALLY REINFORCED HYDRAULIC CILINDERS WITH SHOCK ABSORPTION SYSTEM AND SAFETY CHAMBERS
Excellent guidance of piston rods, high pressure joints from TRELLEBOURG, double lip scrapers as well as tempered, rectified and chromed piston rods.
All cylinders are tested at 400 bar pressure and provided with pressure check points MINIMESS to take a quick pressure reading.
5.- LOAD SAFETY: OMNIDIRECTIONAL WORKING POSITION
In case of power failure, the grab cannot be opened, therefore the load does not fall. Our grabs can work in any inclined position at 60 degrees angle. Optionally, as an additional safety measure, the grabs are supplied with inclinometers.
6.- REMOVABLE AND EXCHANGEABLE MANIFOLD BLOCKS: ALL CIRCUIT VALVES ARE INCLUDED.
Our manifold blocks have rectified surfaces; they are completely waterproof without leakages or overheating. The decompression device is included, avoiding water hammers. Easy and quick system thanks to its 4 fixing screws, this system simplifies largely maintenance works.
7.- PRESSURIZED, MAGNETIZED AND HYPERFILTERED OIL TANK: OIL CHANGES EVERY 4.000 HOURS
Our grabs have integrated a 3-micron self-filtering system which is continuously filtering oil, it achieves perfect cleanliness state. Magnetized bottom tank provided with anti-cavitation system and anti-condensation valve to avoid mud forming and oil damage.
8.- ELECTRICAL MOTORS WITH LIFETIME MAINTENANCE FREE BEARINGS
9.- MAITENANCE AND LUBRICATION FREE JOINTS
Our bushings have been patented for all grabs joints. They are manufactured in polyethylene and provided with lifetime dry lubricant characterized by its special formulation.
10.- STRUCTURE: CALCULATED AND DESIGNED ACCORDING TO F.E.M. STANDARD CLASIFICATION A8-M8. QUALITY ISO 9001
Our structures are calculated by finite element analysis (ANSYS 17) and designed for a 10 million cycles service life. Heat treatment for steel normalizing and stabilizing in order to avoid welding stresses. Optional suspension: single central, flexible, double, triple…
11.-SHELLS WITH SAFETY BUFFERS AND ANTI-TORSION REINFORCMENTS
Shells are made of steel with high elastic limit, as well as corrosion and abrasion protection with HARDOX 500. Central ribbed reinforced with stiffening elements which provide great resistance against torsion, warping and deformations. Safety buffers protect the hydraulic cylinders against shocks.
12.-CERTIFIED WELDER AND WELDING PROCEDURE CERTIFICATION (ASME SECTION IX)
According to UNE-EN-ISO 15609-1:2005, UNE-EN-ISO 15614-1:2005/A2, EN 9606-1:2014
13.-COMPLETE STEMM KIT -2012: IN ORDER TO AUTOMATE PROCESSES FOR TOTAL PRODUCTIVITY WITHOUT STOPS
It can be synchronized and fully integrated into the crane PLC. The grab becomes into an automated, independent and autonomous handling device. This complete device emits, reflects or registers peripheral signals, informing and checking proper grab operation. It can automatically detect the grab position, state, temperatures, pressures, electrical level, filter state, etc.
14.- ADVANCED FEATURES: SCRATCHING FUNCTION AND SLOW OPENING ON HOPPERS
SCRATCHING function is automatically activated when there are compacted and solidified materials; the grab operates intelligently without any operation intervention. SLOW AND PROGRESSIVE OPENING function only operates on the hoppers, avoiding blockades.
15.-REMOTE CONTROL: GRAB CONNECT
We are proud to be the first company in the world to provide this type of service. This service allows start-up operations, remote diagnostics, control and remote grab check. It is ideal for performing all preventive maintenance operations, technical support and it allows variation of pressure, flow… It provides performance reports, real-time diagnostics, spare parts replacements, incidences, monitoring… Optionally the system can be provided with video camera and Voice over IP.
16.-VIRTUAL TOUR SERVICE, PROVISIONAL ACCEPTANCE, TEST AND TRIALS
During the manufacture process the customer has continuous access through a password. Photos, videos and diagrams are daily updated. Our service is available 7/24 hours. During PROVISIONAL ACCEPTANCE, several tests are performed, at 65 cycles/hour during 48 hours, under vacuum conditions, with a PLC simulating real operations. Pressures, intensities, consumption, temperature, vibrations, dimensional control…. are measured and adjusted.
17.-RENEWAL SERVICE: REVAMPING AND RENEWAL OF OLD GRABS
The current park with a lot of old grabs needs urgently a modernization and renewal. With a reasonable investment, STEMM offers renewal, transformation and revamping services for all brands and models. Thanks to this service, our customers are able to renew their grabs and ensure they are in perfect working conditions.
18.-CONTINUOUS MAITENANCE TRAINING
All STEMM grabs have several stickers with “QR” codes that provide access to our YOU TUBE CHANNEL, where you can find videos that show how to perform routine assembly operations for all machine elements and components, including joints, shafts, pumps, valves, filters….These videos also show how to perform correctly inspection activities…. as well as the resolution of possible incidences.
19.-A WIDE STOCK OF SPARE PARTS FOR IMMEDIATE DELIVERY: SALES ON-LINE
Our online service provides updated prices of any spare part or grabs component (7/24 hours). This service also allows an online spare parts purchase.
20.- BEST QUALITY/PRICE RATIO: ON-LINE PRICE SERVICE
On our web page it is also possible to check all equipment prices. This service helps you quickly and efficiently to evaluate and calculate the investments for your projects. The visitors can register themselves and request for a free access password.
21.- PROMPTNESS AND QUALITY IN OUR AFTER SALES SERVICE (A.S.S.)
All our equipments have two years warranty and any intervention or components are supplied within 24 hours to anywhere in the world.
22.- DOCUMENTATION PROVIDED WITH THE GRAB:
Quality certificates for raw materials, s/DIN 50049/2. Detailed list of all components. Recommended Spare parts. Certificate, test code and procedures acc. UNE 58118. Warranty certificate. Declaration of conformity CE, Quality certificates of Electrical Motors. MAINTENANCE MANUAL (accessible with “QR”), instructions, drawings, hydraulic and electrical diagrams, recommended spare parts and wear parts. (60 pages)