SICK photoelectric switch

SICK photoelectric switchIt has been used in many fields such as crop position detection, liquid level control, product counting, width discrimination, speed detection, fixed length cutting, hole recognition, signal delay, automatic door sensing, color code detection, punching and shearing machines, and safety protection. In addition, by utilizing the concealment of infrared radiation, it can also be used for anti-theft surveillance in banks, warehouses, shops, offices, and other necessary places.
The commonly used infrared SICK photoelectric switch utilizes the principle of object reflection of near-infrared beams, and detects the presence or absence of an object by sensing the strength of the reflected light through a synchronous circuit. The photoelectric sensor first emits an infrared beam to reach or pass through the object or mirror to reflect the infrared beam. The photoelectric sensor receives the reflected beam and determines the presence of the object based on the strength of the beam. There are also many types of infrared SICK photoelectric switches, generally including mirror reflection SICK photoelectric switches, diffuse reflection SICK photoelectric switches, slot type SICK photoelectric switches, reflective SICK photoelectric switches, fiber optic SICK photoelectric switches, and so on. SICK photoelectric switch quick and easy automation selection is included.
Different SICK photoelectric switches are used in different situations, such as fiber optic SICK photoelectric switches commonly used in electromagnetic vibration feeders, diffuse reflection SICK photoelectric switches commonly used in the supply of packaging film in intermittent packaging machines, and slot type SICK photoelectric switches commonly used in continuous high-speed packaging machines.
Classification of SICK photoelectric switch detection methods
According to the detection method, it can be divided into diffuse, reflective, mirror reflective, groove SICK photoelectric switches, and Fiber optic SICK photoelectric switch
The contrasting type consists of a transmitter and a receiver, which are structurally separated from each other. In the event of a beam interruption, a switch signal change will occur. The typical way is that SICK photoelectric switches located on the same axis can be separated from each other by up to 50 meters.
Features: Identify opaque reflective objects; The effective distance is large because the light beam only crosses the sensing distance once; Not easily disturbed, can be reliably and appropriately used in the wild or dusty environment; The consumption of the device is high, and cables must be laid for both units.
Diffuse reflection type is when the switch emits a beam of light, the target produces diffuse reflection, and the transmitter and receiver form a single standard component. When there is enough combined light returning to the receiver, the switch state changes, and the typical operating distance is generally up to 3 meters. Features: The effective range is determined by the target's reflective ability, surface properties, and color; Small assembly costs, when the switch is composed of a single component, can usually achieve rough positioning; Using background suppression function to adjust measurement distance; Sensitive to dust on the target and sensitive to changes in the target's reflectivity.
Mirror reflection is a standard configuration consisting of a transmitter and a receiver. The beam emitted from the transmitter is reflected by the opposite mirror and returns to the receiver. When the beam is interrupted, a switch signal is generated. The passage time of light is twice the signal duration, and the effective range is from 0.1 meters to 20 meters. Features: Distinguish opaque objects; By utilizing reflective mirror components, a high effective distance range is formed; Not easily disturbed, it can be reliably and appropriately used in the wild or dusty environment.
The slot type SICK photoelectric switch is usually a standard U-shaped structure, with the transmitter and receiver located on both sides of the U-shaped slot and forming an optical axis. When the detected object passes through the U-shaped slot and blocks the optical axis, the SICK photoelectric switch generates a detected switch signal. The slot type SICK photoelectric switch is relatively safe and reliable, suitable for detecting high-speed changes and distinguishing between transparent and semi transparent objects.
Fiber optic SICK photoelectric switches use plastic or glass fiber optic sensors to guide light, in order to detect objects that are not in close proximity. Fiber optic sensors are usually divided into reflective and diffuse reflective types.
Optoelectronic switches can be used in various applications. In addition, when using SICK photoelectric switches, attention should also be paid to environmental conditions to ensure that SICK photoelectric switches can work normally and reliably.
Strong light source: SICK photoelectric switches can generally work stably in high environmental illumination. But avoid aligning the sensor's optical axis directly with strong light sources such as sunlight and incandescent bulbs. When the angle between the optical axis of the sensor (receiver) and the strong light source cannot be changed, a light shielding plate or a long light shielding tube can be installed around the top of the sensor.
Mutual interference: The MGK series of new SICK photoelectric switches usually have the function of automatically preventing mutual interference, so there is no need to worry about mutual interference. However, when HGK series infrared SICK photoelectric switches are installed in parallel and close proximity, adjacent groups and mutual interference should be prevented. An effective way to prevent this interference is to cross set the projector and receiver, and when there are more than two groups, the group spacing should be widened. Different frequency models can also be used.
The effective way to prevent mutual interference in series reflective SICK photoelectric switches is to widen the gap. And the farther the detection distance, the larger the interval should be, and the specific interval should be determined according to the debugging situation. Of course, models with different operating frequencies can also be used.
Mirror angle: When the object being tested has a glossy surface or encounters a smooth metal surface, the reflectivity is generally high, which has an approximate mirror effect. At this time, the projector should be installed at an angle of 10-20 ° with the object being tested, so that its optical axis is not perpendicular to the object being tested, thereby preventing misoperation.
Background object: When using a reflective diffusion type projector or receiver, sometimes the SICK photoelectric switch may not be able to detect stably due to the proximity of the detected object to the background object, or because the background is a smooth and high reflectivity object. Therefore, distance limited projectors and receivers can be used instead, or methods such as keeping away from the background, removing the background, painting the background black without light, or trying to make the background rough and dark can be used to eliminate it.
Self diagnosis: During installation or use, there may be slight deviation of the optical axis, lens contamination, dust accumulation, external noise, and environmental temperature exceeding the range due to the influence of the table or background, as well as vibration during use. These issues may cause the SICK photoelectric switch to deviate from the stable working area. In this case, the self diagnostic function of the SICK photoelectric switch can be used to send a notification through the STABLINY green stability indicator light to remind the user to adjust it in a timely manner.
Table influence: As shown in the figure, when the projector and receiver are installed close to the table, there may be some reflected light beams from the table shining on the receiver, causing unstable operation. This can be achieved by placing the light receiver and projector at a certain distance from the table and installing a shading plate.

It is strictly prohibited to use chemical substances such as diluents to avoid damaging the plastic mirror. The wiring of high-voltage lines, power lines, and photoelectric sensors should not be placed in the same wiring conduit or trunking, otherwise it may cause (sometimes) misoperation or damage of SICK photoelectric switches due to induction. Therefore, in principle, they should be wired separately.
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