German Bosch Rexroth sensors, Bosch Rexroth models, Bosch Rexroth prices

Bosch Rexroth sensors are components that convert changes in non-electrical quantities (such as speed and pressure) into changes in electrical quantities. Depending on the non-electrical quantity being converted, they can be classified as pressure sensors, speed sensors, temperature sensors, etc., and serve as parts and accessories for measurement and control instruments and equipment.

Bosch Rexroth sensor structure

It consists of two parts: the scale grating and the grating readhead. The figure on the right shows the structure of the grating scale. The key part of the grating detection device is the grating readhead, which comprises a light source, a condenser lens, an index grating, photoelectric elements, and an adjustment mechanism. There are many structural forms of grating readheads; based on their structural characteristics and application scenarios, they are classified into direct-reception readheads (also known as silicon photovoltaic cell readheads), mirror-image readheads, beam-splitter readheads, and metal grating reflection readheads.

Bosch Rexroth sensor principle

The essence of a grating displacement sensor is to perform measurement by using the grating pitch as a standard ruler. High-resolution grating scales are generally expensive and difficult to manufacture. To improve system resolution, Moiré fringes need to be subdivided; grating scale sensor systems mostly employ electronic subdivision methods. When two gratings overlap with a slight angle of inclination, Moiré fringes are generated in a direction roughly perpendicular to the grating lines. As the grating moves, the Moiré fringes move up and down accordingly. This converts the measurement of the grating pitch into the measurement of the number of Moiré fringes. Within the width of one Moiré fringe, placing 4 photoelectric devices at specific intervals enables electronic subdivision and direction determination. For example, for a grating scale with 50 line pairs per mm, the grating pitch is 0.02mm. With four-fold subdivision, counting pulses with a resolution of 5μm can be obtained, achieving high precision in general industrial measurement and control. Since displacement is a vector, both its magnitude and direction must be detected; therefore, at least two photoelectric signals with different phases are required. To eliminate common-mode interference, DC components, and even harmonics, differential amplifiers composed of low-drift operational amplifiers are typically used. The 4 photoelectric signal paths obtained from 4 photosensitive devices are fed into the input terminals of 2 differential amplifiers respectively. The two signals output from the differential amplifiers have a phase difference of π/2. To obtain direction determination and counting pulses, these two signals must first be shaped into square waves with a duty cycle of 1:1. Then, by comparing the phases of the square waves, the movement direction of the grating scale can be determined. By counting the square wave pulses, the displacement and speed of the grating scale can be obtained.

Bosch Rexroth sensor usage precautions

When plugging and unplugging the connector of the linear scale sensor and the digital readout unit, ensure the power is turned off. Install an external protective cover whenever possible, and promptly remove chips and oil that splash onto the scale to strictly prevent any foreign matter from entering the housing of the linear scale sensor. Regularly check whether the mounting and connection screws are loose. To extend the service life of the dust-proof sealing strip, apply a thin, even layer of silicone oil to the strip, taking care not to let it splash onto the glass grating etched surface. To ensure the reliability of the linear scale sensor, clean and wipe the linear scale surface and the index grating surface at regular intervals using an ethanol mixture (50%) to keep the glass linear scale surface clean. The linear scale sensor is strictly prohibited from being subjected to severe vibration or impact, as this may damage the linear scale; if the linear scale breaks, the sensor will fail. Do not disassemble the linear scale sensor yourself, and never arbitrarily change the relative spacing between the main scale and the secondary scale. Otherwise, this may compromise the accuracy of the linear scale sensor and cause relative friction between the main scale and the secondary scale, damaging the chrome layer and thus the grating lines, resulting in scrapping of the linear scale. Take care to prevent oil stains and water from contaminating the linear scale surface, as this may disrupt the distribution of the grating lines and cause measurement errors. The linear scale sensor should be operated in environments with severe corrosive effects as little as possible, to avoid corroding the chrome layer of the grating and the surface of the linear scale, which would degrade the quality of the linear scale.

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