Standing wave vibration type lever detecting device

Abstract

The invention discloses a standing wave vibration type lever detecting device suitable for substances for easily forming hanging materials and clipping materials and light substances with poor flowability. The detecting device comprises a standing wave vibration rod, a first elastic tray and a second elastic tray for supporting the vibration rod, and a fixed shell for connecting the first elastic tray and the second elastic tray. The standing wave vibration rod is partitioned into a vibration starting section provided with a driver and a receiver, an amplification section provided with a vibration absorber, and a detection section in contact with a detected material by the two elastic trays. The vibration starting section is driven by the driver, and the detection section acquires amplification of amplitude. The main body of the detection section is a knife-like vibrator; and when the knife-like vibrator is damped by the material, the receiver picks up information, the vibration of which is quickly attenuated. The detecting device has the advantages of impact resistance, wide application range, hanging prevention, good sensitivity, high vibrating efficiency and firm structure.

Description

technical field [0001] The invention relates to the technical field of automation control, in particular to a material fixed-point detection system composed of a piezoelectric element and a mechanical resonance structure, which belongs to ancillary equipment for automatic control of solid or liquid material processes. [0002] The control circuit outputs a voltage signal, which excites the piezoelectric element to drive the matching mechanical element to generate resonance, and transmits it to the detection probe. When the material to be tested is covered by the vibrating detection probe, the vibration amplitude is sharply reduced due to the damping effect of the material. Through the receiver, the information of this mechanical vibration change is converted into the capacitance change of the piezoelectric ceramic, and the pick-up The vibration change signal is transmitted to the control circuit to realize the measurement and control of the material position. [0003] It is s...

AI Technical Summary

Problems solved by technology

[0007] First, the piezoelectric ceramic is located at the front end of the detection device. When the material is detected, this part extends into the hopper, and the violent impact of the material is directly transmitted to the piezoelectric ceramic 16, 17 of the vibrating rod 15 through the resonance tube 18, which can cause the piezoelectric ceramic The rupture of 16 and 17 causes the level detection device to fail; at the same time, the piezoelectric ceramic part of the detection device is in the silo and is directly affected by the temperature of the silo. It can only be used in general temperature environments and cannot be used in higher temperature environments. ;

[0008] Second, the resonant tube 18 of the detection device has a large contact area with the material in the falling direction of the material, and the impact force received is large. When detecting heavy materials, the resonant tube 18 may be deformed or damaged, and the large contact area with the material may easily cause the material The accumulation of causes false detection;

The detection device is difficult to detect light-density powder or granular solid materials and general liquid materials;

[0010] Fourth, the lead wire of the piezoelectric ceramic is long and cannot be positioned in the resonant tube. The lead wire is easy to contact with the vibrating rod or the resonant tube to cause damping, and false detection or alarm occurs when there is no material contact.

[0011] Fifth, the resonance tube 18 of the detection device has a thin-walled structure. When the user accidentally touches the resonance tube 18 with excessive force or is pressed by an overweight material, the resonance tube 18 is likely to be deformed and contact with the resonance rod 15. Loss of device detection function;

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