Leuze switch German Leuze model Leuze price

Leuze switch, also known as torque switch, torsion switch, torque switch, or torque meter, is divided into two main categories: dynamic and static. Among them, dynamic torque switches are also called torque switches, torque-speed switches, non-contact torque switches, rotating torque switches, etc. Torque switches detect the sensing of torsional moment on various rotating or non-rotating mechanical components. Torque switches convert physical changes in torque into precise electrical signals. Torque switches can be applied in the manufacture of viscometers and electric (pneumatic, hydraulic) torque wrenches. They offer advantages such as high precision, fast frequency response, good reliability, and long service life.

Leuze switch classification

1) Laser speed measurement: With the rise of modern precision manufacturing and the demand for cost savings, non-contact speed switches will gradually replace contact speed switches. Currently, the non-contact laser speed switch with higher precision and most common use on the market is the ZLS-Px aberration speed switch. The aberration speed switch has two ports: one emission port that emits a LED light source; and one high-speed photography port that achieves CCD area high-speed imaging comparison. By comparing images at two points in time within an extremely short period, it determines the distance the measured object has moved. Combined with algorithms inside the switch, it outputs the speed of the measured object in real time. As shown in the figure, (1) is the LED light emission port, (2) is the camera reception port, (3) and (4) are terminal blocks, and (5) are mounting screw holes. The (1) LED light emission port emits laser toward the measured object, which reflects to the (2) camera reception port. After receiving the signal, it is transmitted to the signal processor, which calculates the speed via algorithm. The ZLS-Px aberration speed switch can simultaneously measure speed and length in two directions. It can not only detect whether the measured body has stopped but also detect its direction of motion. Mount the switch on a stable bracket to ensure that the rotating process of the object does not produce excessive vibration, thereby enabling measurement of the rotation angle and rotational speed of the rotating measured body. 2) Radar speed measurement: Traditional speed measurement mostly involves rotary motion speed measurement and linear motion speed measurement. However, there are many irregular speed measurements in industrial automation reality, such as athlete motion speed measurement, traffic vehicle speed measurement, and golf ball speed measurement. Radar speed switches can meet these requirements.

Leuze switch principle

The transmissive speed switch consists of a slotted or notched disk, a light source, and a phototube. When the disk rotates with the measured shaft, light can only reach the phototube through the holes or notches. When the phototube is illuminated, its reverse resistance is very low, outputting an electrical pulse signal. When the light source is blocked by the disk, the phototube's reverse resistance is very high, and no signal is output from the output terminal. Thus, based on the number of holes or notches on the disk, the rotational speed of the measured shaft can be determined. The usual number of disk holes or notches is unclear in the source, so when the measured shaft completes one revolution, the photoelectric converter outputs 60 pulse signals. If the time base signal of the electronic counter is taken as 1s, the rotational speed of the measured shaft can be read directly. The principle of the reflective speed switch is the same as that of the transmissive type; it converts sensed light changes into electrical signal changes via a phototube, but it obtains pulse signals through light reflection. Typically, reflective material is adhered to the measurement area of the measured shaft to form a reflective surface. Commonly used reflective materials include special speed-measuring reflective paper tape (adhesive tape), or aluminum foil and other reflective materials may be used instead. Sometimes white paint can be applied to the measured area as a reflective surface. The projector and reflective surface must be properly configured; typically, the distance between them is 5-15M. When the measured shaft rotates, the photoelectric element receives pulsating illumination and outputs corresponding electrical signals to the electronic counter, thereby measuring the rotational speed of the measured shaft. The waveform of the output signal from photoelectric speed switches is relatively regular, close to a standard square wave, with almost no interference signals generated. However, since vibration reduces the lifespan of the light source in transmissive types, they are not suitable for conditions with strong vibration. Reflective types have no mechanical connection with the measured shaft and are convenient to use.

Leuze switch industry applications

1) Modern vehicles are generally equipped with engine control, autonomous driving, ABS, TRC, automatic door locking, active suspension, guidance systems, electronic instruments, and other devices, all of which require vehicle speed signals. Therefore, the accuracy and stability of the output signal from the speed measurement switch will greatly affect these control units. Vehicle speed switches mostly adopt a Hall-effect structure. A Hall speed switch is a magneto-electric switch based on the Hall effect, featuring high sensitivity to magnetic fields, stable output signal, high frequency response, strong anti-electromagnetic interference capability, simple structure, and ease of use. It mainly consists of permanent magnets with a specific number of pole pairs (generally 4 or 8 pairs), Hall elements, a rotating mechanism, and input/output connectors. Its working principle is that when the switch's rotating mechanism rotates under external drive, it drives the permanent magnet to rotate, causing periodic changes in the magnetic field passing through the Hall element. This causes changes in the output voltage of the Hall element, which is processed by subsequent circuits to form a stable pulse voltage signal as the output signal of the speed switch. Main electrical technical parameters of Hall-structure speed switches include: output signal high voltage, low voltage, duty cycle, period, rise time, fall time, and number of pulses per cycle. To ensure product performance reliability, these parameters must be quantitatively tested before factory release. Test systems featuring integration and intelligence, efficient automatic measurement, software calculation, and graphical or tabular display of test results are increasingly favored by automotive speed switch manufacturers. A comprehensive testing device developed for performance measurement of commonly used Hall-effect vehicle speed switches. Based on cost considerations, it uses the high-speed counter port of a microprocessor for data acquisition from the vehicle speed switch, and employs software control to calculate and graphically display the acquired data. The completed testing device offers advantages such as high testing precision, reliable data communication, a user-friendly graphical interface, strong anti-interference capability, simple and intuitive testing process, and low system development cost. It has good market promotion potential, so speed switches will have huge application prospects in vehicle speed detection. 2) Speed switches for belt conveyors adopt Hall switches, which primarily utilize the Hall effect to achieve magneto-electric conversion. Since the discovery of the Hall effect in 1879, it has undergone more than 100 years of development history. However, its application gained attention and widespread adoption only in the 50s of this century, due to the rapid development of microelectronics, leading to the continuous development of various Hall elements. China began increasing research on Hall elements in the 20s of the 70th century. After nearly several decades of research and development, it is now capable of producing Hall elements with various performances, such as ordinary type, high-sensitivity type, low temperature coefficient type, temperature/magnetic measurement type, and switching type Hall elements. Due to the characteristics of Hall switches—high sensitivity, good linearity, high stability, small size, and high temperature resistance—they have been widely applied in various industrial fields including non-electrical quantity measurement automatic control, computer devices, and modern military technology.

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