Introduction
The infrared anti-collision limit switch consists of an infrared transmitter, receiver, control unit and mounting bracket, usually installed in pairs at both ends of the crane bridge or trolley traveling direction. The transmitter emits modulated infrared light beams, and the receiver detects reflected or through-beam light intensity, calculating distance via triangulation or time-of-flight principle. The control unit compares measured distance with set values, outputting deceleration signal at the deceleration distance point, cutting off traveling power at the stop distance point, and triggering emergency stop at the emergency distance point. Adopting modulated infrared light technology, it effectively filters interference from ambient natural light, lighting and welding arc, ensuring stable and reliable detection. Some models feature digital distance display and RS485 communication, connectable to the crane safety monitoring system. Widely used in anti-collision protection of bridge cranes, gantry cranes and electric hoist traveling mechanisms, especially suitable for multi-crane operation scenarios on the same span.
Our Advantage
Non-contact detection with long service life: Using infrared non-contact detection principle with no mechanical wear parts, no physical contact with obstacles required, maintenance-free under normal use with service life over 10 years, far superior to mechanical travel limit switches.
Multi-stage distance protection for safety: 2~3 protection distance stages—deceleration, stop and emergency stop—can be set; when the crane approaches an obstacle, it first decelerates then stops, avoiding emergency stop impact, both preventing collision and protecting mechanisms and loads, with safety margin far higher than single-stage limit.
Modulated infrared with strong anti-interference: Using specific frequency modulated infrared light with narrow-band filter, it effectively filters ambient light interference such as sunlight, workshop lighting and welding arc, maintaining stable detection even in strong light, dust and smoke environments without false or missed alarms.
Adjustable detection distance with strong adaptability: Detection distance continuously adjustable from 1 to 30m, flexibly set according to crane traveling speed, braking distance and site space, compatible with 0.5t~100t various cranes and different traveling speeds, with extremely strong versatility.
Easy installation with simple debugging: Compact size, fixed to end beam or trolley end via bracket bolts, with adjustable transmitter/receiver angle; distance learning completed by pressing the set button after power-on, no professional tools required, reducing installation and debugging time by 60% with low renovation cost.
Specification
| Parameter | 0.5~5t | 10~20t | 32~50t | 80~100t |
| Applicable Capacity | 0.5/1/2/3/5t | 10/16/20t | 32/50t | 80/100t |
| Applicable Travel Speed | ≤20 m/min | ≤30 m/min | ≤40 m/min | ≤60 m/min |
| Detection Distance | 1~10m（adjustable） | 1~15m（adjustable） | 1~20m（adjustable） | 1~30m（adjustable） |
| Protection Stages | 2 levels (Deceleration + Stop） | 3 levels (Deceleration + Stop + Emergency Stop) | 3 levels (Deceleration + Stop + Emergency Stop) | 3 levels (Deceleration + Stop + Emergency Stop) |
| Response Time | ≤0.05s | ≤0.05s | ≤0.05s | ≤0.05s |
| Detection Method | Through-beam / Retro-reflective（optional） | Through-beam / Retro-reflective（optional） | Through-beam / Retro-reflective（optional） | Through-beam / Retro-reflective（optional） |
| Output Contact | 3 Relays（ NO+NC） | 3 Relays（ NO+NC） | 3 Relays（ NO+NC） | 3 Relays（ NO+NC） |
| Contact Capacity | 5A / 250VAC | 5A / 250VAC | 10A / 250VAC | 10A / 250VAC |
| Display | LED status（digital optional） | LED status（digital optional） | LED status（digital optional） | LED status（digital optional） |
| Communication | RS485（optional） | RS485（optional） | RS485（optional） | RS485（optional） |
| Power Supply | DC 24V / AC 220V（optional） | DC 24V / AC 220V（optional） | DC 24V / AC 220V（optional） | DC 24V / AC 220V（optional） |
| Protection Grade | IP65 | IP65 | IP65 | IP65 |
