Industrial limit switches are widely used in a variety of inspection and control applications. The limit switch enables presence/absence detection in areas that allow physical contact. When an object is detected, the switch actuator acts, and the normally open or normally closed electrical contacts in the switch body change state, thereby enabling the AC/DC circuit to be turned on and off.
When installed on heavy construction machinery, agricultural equipment or solid waste treatment vehicles, the function of the limit switch will be tested to the maximum extent possible. These applications produce very strong shocks and vibrations. These machines and equipment typically work in very harsh outdoor and dirty environments throughout the year and are therefore subject to a variety of environmental factors. In these cases, it is very challenging to effectively and efficiently maintain the corresponding performance and function for each action of the limit switch. Reliability, durability and safety are the three most critical factors for limit switch users.
Honeywell offers a wide range of MICRO SWITCH® limit switches (both heavy and medium) to suit different industrial applications. These heavy-duty electromechanical products not only provide higher performance for harsh and demanding industrial applications, but also provide a safer working environment for workers.
Considering the impact and vibration generated by these machines, it is very likely that ordinary limit switches will encounter the following conditions:
1. Switch contact failure
2. The internal and external mechanical connections of the switch are damaged or loose.
3. The internal parts of the switch produce abrasive powder, which greatly shortens the life of the switch and even causes related faults or accidents.
Honeywell's MICRO SWITCH® limit switches offer high flexibility in handling high vibrations, shocks and impact forces, and can often be mounted directly onto heavy machinery or in close proximity (large loads at these locations) ). These industrial limit switches feature a wide range of NEMA/IP protection to protect against environmental factors such as rain, moisture, hail and liquid splashes. These heavy-duty limit switches are designed to work effectively at low temperatures (cold temperatures) and high temperatures.
Figure 1: Overview of Honeywell's MICRO SWITCH® Heavy Duty Limit Switch HDLS Series
1. Chuck and recessed head design to maintain a firm grip from the head to the body
2. Adopt enhanced plug-in terminal design between the switch body and the socket to maintain electrical continuity under extreme temperature, vibration and shock conditions.
3. Self-lifting platen terminals save wiring time
4. The grounding terminal (internal) is easy to identify and meets the standards of relevant regulatory agencies.
5. Each switch has four mounting holes: two through holes for front mounting and two threaded holes for rear mounting
6. Dual-axis seals provide additional protection (optional fluorocarbon or fluorosilicone seals)
7. Unique small foil design to ensure proper torque
8. Use diaphragm seals as an additional measure of protection
9. Rugged and corrosion resistant zinc head and body are phosphate treated and epoxy coated
10. Sintered brass bearing 303 stainless steel operating shaft for longer mechanical life and higher operational reliability
11. Domestic and international common thread of thread
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