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Automatic Long Arm Drop Beam Barrier
The Madoors USA Automatic Long Arm Drop Beam Barrier — MDR-LB-2500 — is a hydraulic automatic long arm barrier system engineered for access control at the widest industrial and critical infrastructure entrances, with a one-piece arm length manufactured up to 25 meters — a world-unique design exclusive to Madoors USA. Specifically designed for ports, oil refineries, stone crushing and separating plants, mine fields, dams, and power plants where trucks, trailers, and large construction machines operate continuously through wide entrance and exit points, the MDR-LB-2500 provides complete wide-span barrier closure with an integrated security system incorporating photocell obstruction detection, loop detector vehicle sensing, traffic light signal control, and a 4-piston hydraulic system with 2 master and 2 slave pistons operating with full redundancy and a piston inlet-outlet lock system that prevents arm drop in the event of piston failure or hydraulic pipe oil leakage.
This product is designed by Madoors USA and is unique in the world — no other manufacturer produces a one-piece hydraulic drop beam barrier arm of up to 25 meters capable of closing the wide openings encountered at heavy industrial and critical infrastructure access points in a single unbroken span.
TECHNICAL SPECIFICATIONS
The MDR-LB-2500 operates on a hydraulic drive system, providing the high force output required for reliable operation of barrier arm lengths up to 25 meters at the heavy-duty cycle rates demanded by continuous truck and trailer traffic at industrial facility entrances. The arm is manufactured in one piece up to 25 meters in length, eliminating the structural joints, alignment requirements, and mechanical complexity associated with multi-section barrier arm systems for wide openings.
The hydraulic actuation system incorporates 4 pistons in a 2-master, 2-slave configuration. The 2 master pistons provide primary actuation control of the barrier arm through the full raise and lower travel cycle. The 2 slave pistons operate redundantly, providing backup actuation capability that maintains barrier operation in the event of a primary piston failure. A lock system is fitted at the inlet and outlet of each piston, holding the opposite rod in a stable position and preventing the barrier arm from dropping due to piston mechanical failure or hydraulic pipe oil leakage — a critical safety requirement for a 25-meter arm operating over continuous heavy vehicle traffic.
The integrated security and safety system includes photocell obstruction detection that halts barrier arm movement immediately upon beam interruption, loop detector vehicle presence sensing for automated access control triggering, traffic light signal integration providing visual stop and go indication to vehicle operators approaching the barrier, and the hydraulic protection system managing actuator pressure and preventing system overload during normal and emergency operation cycles.
KEY FEATURES
25-Meter One-Piece Arm — World-Unique Design
The MDR-LB-2500 is the only hydraulic drop beam barrier system in the world capable of manufacturing and operating a one-piece barrier arm up to 25 meters in length. This single-span capability closes the widest industrial and infrastructure entrance openings — port berth access roads, refinery truck gates, mine site haul road barriers, and dam access roads — in a single unbroken arm without the structural joints, section alignment requirements, and mechanical complexity of multi-piece wide-span barrier systems.
Hydraulic Drive System
The barrier operates on a hydraulic drive system delivering the high force output required for reliable actuation of arm lengths up to 25 meters at the continuous cycle rates generated by heavy truck, trailer, and construction machine traffic at active industrial facility entrances. Hydraulic drive provides consistent actuation force across varying temperature and load conditions — essential for reliable operation in the exposed outdoor environments of ports, refineries, mine sites, and dam facilities.
4-Piston Redundant System — 2 Master, 2 Slave
The 4-piston hydraulic configuration with 2 master pistons providing primary actuation and 2 slave pistons operating redundantly ensures that the barrier system maintains full operational capability even if one or more primary pistons experience mechanical failure. The redundant slave pistons activate automatically to maintain barrier arm control — preventing the loss of access control at critical infrastructure entrances during primary piston failure events.
Piston Inlet-Outlet Lock System — Anti-Drop Safety
A lock system fitted at the inlet and outlet of each piston holds the opposite rod in a stable, fixed position in the event of piston failure or hydraulic pipe oil leakage, physically preventing the barrier arm from dropping under gravity onto vehicles or personnel below. This anti-drop safety mechanism is the critical safety design feature of the MDR-LB-2500 — ensuring that a 25-meter barrier arm never falls onto a vehicle or operator due to hydraulic system failure, regardless of the failure mode.
Photocell Obstruction Detection
Photocell safety sensors are integrated into the barrier system to detect any vehicle, person, or object in the barrier arm travel path during lowering, halting arm movement immediately upon beam interruption. This prevents arm contact with vehicles that have stopped or stalled under the arm during the closing cycle — a critical safety requirement for a 25-meter arm operating over continuous heavy vehicle traffic at high-volume industrial entrances.
Loop Detector Vehicle Sensing
Embedded loop detectors in the approach lane provide automatic vehicle presence detection, enabling the barrier system to trigger arm raising in response to approaching vehicles under automated access control operation — without requiring manual operator activation for each vehicle pass. Loop detector integration allows the MDR-LB-2500 to operate efficiently at high-volume entrances without creating vehicle queuing from manual activation delays.
Traffic Light Signal Integration
Integrated traffic light signals provide clear visual stop and go indication to vehicle operators approaching the barrier, coordinating vehicle movement with barrier arm position and preventing vehicles from approaching a lowered arm or proceeding before the arm has fully raised. Traffic light integration is essential for safe operation at high-volume industrial entrances where vehicle operators may not have direct sight of the barrier arm position due to vehicle cab height or approach angle.
Comprehensive Security System Design
The complete MDR-LB-2500 security system — photocell, loop detector, traffic light, hydraulic protection, and 4-piston redundant actuation — is designed with security and safety in the foreground, providing a complete, integrated access control and safety solution for the most demanding heavy industrial and critical infrastructure entrance applications.
Indispensable for Heavy Vehicle & Wide Opening Applications
The MDR-LB-2500 is specifically engineered as the access control solution for entrance and exit points where trucks, trailers, and large construction machines operate continuously and where opening widths exceed the capability of conventional barrier systems. For ports, refineries, mine sites, dams, and power plants — facilities where wide openings and heavy vehicle traffic are operational constants — the MDR-LB-2500 is the only barrier system that provides complete span closure with certified safety and redundant actuation.
ASSEMBLY & INSTALLATION SEQUENCE
Site Survey & Foundation Design
The entrance opening width, ground conditions, buried service locations, vehicle traffic profile, and operational cycle rate requirements are surveyed and assessed. One-piece arm length is confirmed against the measured opening width. Foundation positions for the barrier housing and counterweight assembly are designed to the structural loading requirements of the specified arm length and hydraulic actuation system.
Foundation Excavation & Concrete Works
Foundation excavation is completed at the barrier housing and counterweight positions. Reinforced concrete foundations are cast with anchor bolt positions set to the installation engineering drawings. Hydraulic supply line routing from the power unit to the barrier housing is confirmed and conduit installation is completed during foundation works.
Barrier Housing Installation
The barrier housing — containing the hydraulic cylinder assembly, piston lock system, and arm mounting hardware — is installed onto the cast foundation anchor bolts. Housing alignment and level are verified before arm installation proceeds.
Hydraulic Power Unit & Supply Line Installation
The hydraulic power unit is installed at the specified position. Supply lines are run from the power unit to the barrier housing through the pre-installed conduit. All hydraulic connections are made and the system is pressure-tested to the specified operating pressure before arm installation.
One-Piece Arm Installation
The one-piece barrier arm — up to 25 meters in length — is installed onto the arm mounting hardware within the barrier housing. Arm balance, pivot geometry, and travel arc are verified. Counterweight adjustment is made to achieve the specified actuation force balance across the full raise and lower cycle.
Piston Lock System Testing
The piston inlet-outlet lock system is tested across simulated piston failure and hydraulic pressure loss scenarios to verify that the lock mechanism engages correctly and holds the arm in position without dropping under gravity in both failure conditions.
Photocell, Loop Detector & Traffic Light Installation
Photocell detection units are installed and aligned across the barrier arm travel path. Loop detectors are installed in the approach lane surface. Traffic light signal units are positioned at the specified approach visibility positions. All sensor and signal wiring is connected to the barrier control system.
Control System Commissioning & Redundancy Testing
The barrier control system is commissioned. Master and slave piston operation is verified across multiple raise and lower cycles. Redundant slave piston automatic activation is tested by simulating primary master piston failure. Photocell halt response, loop detector trigger, and traffic light sequence are tested and verified across full operational cycles.
Operational Testing & Handover
Complete operational testing is conducted at the specified vehicle traffic cycle rate. Anti-drop lock system, photocell safety response, loop detector activation, traffic light coordination, and hydraulic protection system operation are all verified. Installation handover documentation is completed.
DEPLOYMENT SCENARIOS & USE CASES
The Madoors USA MDR-LB-2500 Automatic Long Arm Drop Beam Barrier is specified for any industrial or critical infrastructure entrance where opening width, heavy vehicle traffic, and continuous operation demand exceed the capability of conventional barrier systems.
- Port and marine terminal berth access road barriers
- Oil refinery and petroleum facility main truck entrance barriers
- Stone crushing and aggregate separating plant access control
- Mine site haul road and site entrance barriers
- Dam facility access road and restricted zone barriers
- Power station and energy facility main entrance barriers
- Petrochemical plant and chemical facility truck gate barriers
- Steel mill and heavy manufacturing facility entrance control
- Cement plant and bulk materials facility entrance barriers
- Airport cargo terminal heavy vehicle access control
- Military logistics base heavy vehicle entrance barriers
- Rail depot and intermodal terminal truck access control
- Waste processing and landfill facility entrance barriers
- Water treatment and reservoir facility access road barriers
- Large-scale construction site main entrance access control
- Category: Drop Arm Barriers