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NTN imported centripetal thrust ball bearing skills
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Number CAB
Touch angle A is the specification touch angle; therefore it will not appear in the NTN bearing type.
The NTN radial thrust ball bearing has a radial load in addition to it; it can also bear a large one-way axial load. The larger the touch angle, the greater the ability to withstand the axial load. The axial component force occurs due to the radial load; Therefore, the radial thrust ball bearings are usually paired. NTN is the same high-speed radial thrust ball bearing and super high-gravity thrust ball bearing; they also have different dual-equipment. Most precision is 5 or above. Equipped with NTN imported radial thrust ball bearings; all set preload.
2; imported four-point touch centripetal thrust ball bearing four-point touch ball bearing touch angle is 30 °; its inner ring can be divided into two lobes. When the inlet shaft is subjected to radial load; steel ball and inside and outside There are four touches on the raceway. This depiction allows the NTN bearing to withstand axial loads in any direction. When the bearing is only subjected to one-way axial load or high axial load; four-point touch radial thrust ball bearing and centripetal Thrust ball bearings have the same two-point touch.
3; double row radial thrust ball bearing imported double row radial thrust ball bearing is a back-to-back combination (DB) method for two pairs of single row radial thrust ball bearings; the inner and outer rings are made into one bearing; the touch angle is 25°. This bearing can withstand two-way radial and axial loads; it can also withstand transient high loads.
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The vibration sensor(Vibration Transmitter) is one of the key components in the testing technology of Vibration Measurement. Its main function is to receive the mechanical quantity and convert it into a proportional electric quantity. Because it is also an electromechanical conversion device. So we sometimes call it a transducer, a vibration pickup, etc.
Commonly used vibration sensors are as follows:
1. Piezoelectric resonant
The piezoelectric sheet is used to receive the vibration signal, and the resonance frequency of the piezoelectric sheet is relatively high. In order to reduce the resonance frequency, it is realized by increasing the mass of the piezoelectric sheet vibrating body, and using a spring ball instead of an appendage to reduce the two resonance frequencies and enhance the vibration effect. Its advantages are high sensitivity and simple structure. However, the signal needs to be amplified and sent to a TTL circuit or a single-chip microcomputer circuit, but it is enough to use a triode single-stage amplification
2. mechanical vibration
In the traditional vibration detection method, after being vibrated, the spring ball vibrates at a reduced amplitude for a long time, and this vibration is easy to be detected by the detection circuit. The vibration output switch signal is determined by the output impedance and the resistance value of the matching output. According to the input impedance of the detection circuit, it can be made into a high-impedance output mode.
3. Micro Vibration Sensor
The mechanical vibration sensor is miniaturized, the vibration body is carbonized and sealed, and its working performance is more reliable. The output switching signal is directly connected with the TTL circuit and or the input circuit of the single-chip microcomputer, and the circuit structure is simple. The output impedance is high, and the quiescent working current is small.
Advantages of Vibration Sensors
1. Small size and light weight. It can be applied to some vibration test systems that are greatly affected by the additional mass.
2. It has a wider response frequency range of 4Hz-2000Hz than the magnetoelectric speed sensor, and the mechanical moving parts are not easy to damage
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