Bosch Rexroth switch German Bosch Rexroth model Bosch Rexroth price

Bosch Rexroth switches generally consist of 2 parts: the processing path and the processing element. The basic principle is based on the photoelectric effect, converting changes in the measured variable into changes in optical signals, and then using photoelectric components to further convert non-electrical signals into electrical signals. The photoelectric effect refers to illuminating an object with light, which can be viewed as a stream of photons with specific energy bombarding the object. At this time, photon energy is transferred to electrons, and the entire energy of one photon is absorbed by one electron at once. After the electron gains the energy transferred by the photon, its state changes, causing the illuminated object to produce a corresponding electrical effect. The photoelectric effect is usually divided into 3 categories: (1) The phenomenon where electrons escape from the surface of an object under the action of light is called the external photoelectric effect, such as in phototubes and photomultiplier tubes; (2) The phenomenon where the resistivity of an object changes under the action of light is called the internal photoelectric effect, such as in photoresistors and phototransistors; (3) The phenomenon where an object generates an electromotive force in a specific direction under the action of light is called the photovoltaic effect, such as in photocells.

Bosch Rexroth switch principle

Photoelectric switches achieve control by converting changes in light intensity into changes in electrical signals. Generally, a photoelectric switch consists of three parts: transmitter, receiver, and detection circuit. The transmitter emits a light beam toward the target. The emitted light beam usually comes from semiconductor light sources, such as light-emitting diodes (LED), laser diodes, and infrared emitting diodes. The light beam is emitted continuously or with modified pulse width. The receiver consists of photodiodes, phototransistors, and photocells. Optical components such as lenses and apertures are installed in front of the receiver. Behind it is the detection circuit, which filters out valid signals and applies them. In addition, structural components of photoelectric switches include emitter plates and optical fibers.

Bosch Rexroth switch classification

1) Slot-type photoelectric switch: A slot-type photoelectric switch is formed by mounting a light emitter and a receiver face-to-face on both sides of a slot. The emitter can emit infrared or visible light, and the receiver can receive the light when there is no obstruction. However, when the detected object passes through the slot, the light is blocked, causing the photoelectric switch to actuate and output a switching control signal to cut off or connect the load current, thereby completing a control operation. Due to limitations of the overall structure, the sensing distance of slot-type switches is generally only a few centimeters. 2) Through-beam photoelectric switch: Separating the emitter and the receiver increases the sensing distance. A through-beam separated photoelectric switch, abbreviated as through-beam photoelectric switch, consists of one emitter and one receiver. The sensing distance of through-beam photoelectric switches can reach several meters or even tens of meters. When using a through-beam photoelectric switch, install the emitter and receiver on opposite sides of the path through which the detected object passes. When the object passes through and blocks the light path, the receiver actuates and outputs a switching control signal. 3) Retro-reflective photoelectric switch: The emitter and receiver are housed in the same unit, with a reflector plate installed in front. It uses the reflection principle to achieve photoelectric control and is called a retro-reflective (or mirror-reflective) photoelectric switch. Under normal conditions, the light emitted by the emitter is reflected back by the reflector plate and received by the receiver. Once the detected object blocks the light path and the receiver does not receive light, the photoelectric switch actuates and outputs a switching control signal. 4) Diffuse-reflective photoelectric switch: The sensing head of a diffuse-reflective photoelectric switch also contains an emitter and a receiver, but there is no reflector plate in front. Under normal conditions, the receiver cannot detect the light emitted by the emitter. During detection, when the object passes through, it blocks the light and reflects part of it back. The receiver then receives the light signal and outputs a switching signal.

Bosch Rexroth switch application cases

1) Application of photoelectric switches in laser weapons: Since photoelectric switches are particularly sensitive to infrared radiation, visible light, or both, they are more likely to become targets of laser attacks. In addition, electronic systems and the switches themselves are highly susceptible to interference from thermal noise and electromagnetic noise generated by lasers, preventing normal operation. Methods of laser weapon attacks on photoelectric switches on the battlefield mainly include the following: Using a laser beam with appropriate energy to "blind" the switch, making it unable to detect or continue tracking already detected targets. Alternatively, if the switch is guiding a weapon toward a target, blinding will cause it to lose the target. In summary, since switches play an increasingly important role on the battlefield and are vulnerable to laser attacks, they have become the preferred target for low-energy laser weapons. 2) Application of photoelectric switches in automatic meter reading systems: With the development of microelectronics, switching technology, computer technology, and modern communications technology, photoelectric switches can be used to develop automatic meter reading systems. The aluminum disk of an electricity meter rotates driven by torque generated under the action of eddy currents and magnetic fields. Using a photoelectric switch converts the number of rotations of the aluminum disk into pulse counts. For example, partially blackening a rotating shiny aluminum disk and pairing it with a reflective photoelectric emitter-receiver pair generates pulses at the blackened areas as the disk rotates. The number of rotations is sampled and converted into corresponding pulse counts, which are then sent via an optocoupler isolation circuit to the T0 port of the CPU for counting processing. Using optocoupler isolators effectively prevents interference signals from entering the microcomputer. Combined with other transmission methods, this forms an automatic meter reading system. 3) Application of photoelectric switches in monitoring smoke and dust pollution: A photoelectric switch is a small electronic device that can detect changes in received light intensity and achieve control functions by converting changes in light intensity into changes in electrical signals. Due to characteristics such as non-contact operation, fast response, and reliable performance, photoelectric switches are widely used in industrial automation devices and robots. We can utilize the characteristics of photoelectric switches to detect smoke and dust conditions, so the strength of the output signal from the photoelectric switch reflects changes in flue gas turbidity. 4) Hygienic washdown-resistant photoelectric switches: Washdown-resistant switches provide extremely high reliability and comfort while minimizing operating costs. Equipped with IO-Link interfaces and the proTect+ sealing concept, which significantly extends service life, these two new types of switches are suitable for harsh application environments and are ideal solutions for the food and beverage industry.

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