CN216448997U

CN216448997U - Intelligent solid material level switch

Info

Publication number: CN216448997U
Application number: CN202122635394.6U
Authority: CN
Inventors: 赵国成; 王文平
Original assignee: Shanghai Echo Msl Instruments Co ltd
Current assignee: Shanghai Echo Msl Instruments Co ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2022-05-06
Anticipated expiration: 2031-10-29

Abstract

The utility model discloses an intelligent solid material level switch which comprises an MCU (microprogrammed control unit), a phase adjusting circuit, a signal secondary amplification and frequency measurement output circuit, a tuning fork material level sensor, a signal input and gain amplification circuit, a peak value sampling and holding circuit, an output module, an output alarm indicator lamp and a storage module, wherein the phase adjusting circuit is connected with the phase adjusting circuit; when the tuning fork material level sensor does not vibrate, the circuit periodically outputs a vibration signal to the tuning fork material level sensor; after the vibrating fork body vibrates, the tuning fork material level sensor detects a vibration signal, the vibration signal is transmitted to the MCU to be processed, and the MCU controls the output module and outputs the alarm indicating lamp to work. According to the intelligent solid material level switch, the MCU can detect the frequency signal of vibration, so that the reliability is improved. Through the design of each module, the optimal working frequency can be automatically calibrated, the resonance state can be automatically adjusted through regular self-checking, and the service life of the sensor is prolonged; the intelligent solid material level switch has the advantages of high intelligent degree and high detection accuracy.

Description

Intelligent solid material level switch

Technical Field

The utility model relates to an intelligent solid material level switch, in particular to an intelligent solid material level switch with high intelligent degree and high detection accuracy.

Background

The solid tuning fork material level switch is a common instrument in the material level control process, and the reliability of the material level switch is very important to the safety of industrial control. The level switch is often used for high-low level warning, prevents that storage tank evacuation and overflow etc. are all very important. A common tuning fork switch is identified by detecting vibration frequency, and mainly identifies whether a fork body part is covered by a material, if the fork body is covered by the material, vibration disappears, and no vibration frequency exists. In the measurement of solid materials, there may be solid particle impact, vibration of the equipment, and even electrical interference, which may cause noise to the detection. These noises are also liable to cause malfunctions.

Therefore, there is a need for an improvement to overcome the deficiencies of the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems in the prior art and provides an intelligent solid material level switch with high intelligent degree and high detection accuracy.

The technical scheme of the utility model is as follows:

an intelligent solid material level switch comprises an MCU (microprogrammed control unit), a phase adjusting circuit, a signal secondary amplification and frequency measurement output circuit, a tuning fork material level sensor, a signal input and gain amplification circuit, a peak value sampling and holding circuit, an output module, an output alarm indicator lamp and a storage module; the MCU is electrically connected with the phase adjusting circuit, the peak value sampling and holding circuit, the storage module, the signal secondary amplification and frequency measurement output circuit, the output module and the output alarm indicator lamp; the signal secondary amplification and frequency measurement output circuit is electrically connected with the tuning fork material level sensor module, and when the tuning fork material level sensor does not vibrate, the signal secondary amplification and frequency measurement output circuit periodically outputs a vibration signal to the tuning fork material level sensor; tuning fork material level sensor includes vibration fork body, shell, housing screw, piezoceramics group, drive module and signal conductor, drive module with signal second grade is enlargied and frequency measurement output circuit electricity is connected, signal conductor with signal input and gain amplifier circuit electricity are connected, vibration fork body vibration back, tuning fork material level sensor detects vibration signal, and vibration signal passes through signal input and gain amplifier circuit transmit extremely behind the peak value sample hold circuit, the warp peak value sample hold circuit transmits extremely MCU handles, MCU handles the back control to vibration signal output module reaches output alarm indicator lamp work.

As a preferred technical solution, the phase adjusting circuit is electrically connected to the signal input and gain amplifying circuit, the MCU, and the signal secondary amplification and frequency measurement output circuit, and the phase adjusting circuit adjusts a resonance state of the tuning fork level sensor.

As a preferred technical solution, the output module is a relay.

As a preferable technical solution, the peak value sample-and-hold circuit is configured to set a threshold value of the vibration signal, a vibration signal lower than the threshold value is interference, and the MCU determines that the vibration signal is an error signal.

As a preferred technical solution, the storage module is configured to store a vibration frequency and a vibration amplitude of an original vibration signal.

According to the intelligent solid material level switch, the MCU can detect the frequency signal of vibration, and the reliability can be improved by adopting average filtering and the filtering algorithm for removing the highest and the lowest frequencies. Through the design of each module, the optimal working frequency can be automatically calibrated, the resonance state can be automatically adjusted through periodic self-detection, and the service life of the sensor is prolonged.

Drawings

FIG. 1 is a block diagram of an embodiment of the intelligent solid level switch of the present invention;

FIG. 2 is a schematic structural diagram of a tuning fork level sensor in an embodiment of the intelligent solid level switch of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude at least one, unless the context clearly dictates otherwise.

It should be understood that the term "and/or" as used herein is merely a relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B, may represent: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.

It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.

Fig. 1 is a block diagram showing the structure of an embodiment of the intelligent solid level switch according to the present invention. The intelligent solid material level switch comprises an MCU, a phase adjusting circuit, a signal secondary amplification and frequency measurement output circuit, a tuning fork material level sensor, a signal input and gain amplification circuit, a peak value sampling and holding circuit, an output module, an output alarm indicator lamp and a storage module; the MCU is electrically connected with the phase adjusting circuit, the peak value sampling and holding circuit, the storage module, the signal secondary amplification and frequency measurement output circuit, the output module and the output alarm indicator lamp; the signal secondary amplification and frequency measurement output circuit is electrically connected with the tuning fork material level sensor module, and when the tuning fork material level sensor does not vibrate, the signal secondary amplification and frequency measurement output circuit periodically outputs a vibration signal to the tuning fork material level sensor. As shown in fig. 2, the tuning fork level sensor in the intelligent solid level switch of the embodiment includes a vibrating fork 1, a housing 2, a compression screw 3, a piezoelectric ceramic group 4, a driving module 5 and a signal wire 6, the driving module 5 may be a driving signal wire, the driving module 5 is electrically connected to a signal secondary amplification and frequency measurement output circuit, the signal wire is electrically connected to a signal input and gain amplification circuit, and after the vibrating fork vibrates, the tuning fork level sensor detects a vibration signal. After the vibration signal is transmitted to the peak value sampling and holding circuit through the signal input and gain amplification circuit, the vibration signal is transmitted to the MCU through the peak value sampling and holding circuit to be processed, and the MCU processes the vibration signal and then controls the output module and the output alarm indicator lamp to work.

Preferably, the phase adjusting circuit of the intelligent solid material level switch of the embodiment is electrically connected with the signal input and gain amplifying circuit, the MCU, and the signal secondary amplification and frequency measurement output circuit, and the phase adjusting circuit adjusts the resonance state of the tuning fork material level sensor.

In practical application, the output module may be a relay, and may also be other outputs.

Preferably, in the intelligent solid material level switch of this embodiment, the peak sample-and-hold circuit is configured to set a threshold of the vibration signal, the vibration signal lower than the threshold is a disturbance, and the MCU determines that the vibration signal is an error signal.

Preferably, in the intelligent solid level switch of the embodiment, the storage module is used for storing the vibration frequency and the vibration amplitude of the original vibration signal.

The intelligent solid material level switch of the embodiment periodically outputs a vibration signal through the oscillator of the circuit when the tuning fork does not vibrate. And after the fork body vibrates, detecting the frequency of the fork body and a received vibration amplitude signal. The signal of the drive and the gain and phase modulation of the drive are optimized in the process of factory calibration. The reliability can be improved by detecting the frequency signal of the vibration through the MCU and adopting an average filtering algorithm and a filtering algorithm for removing the highest and the lowest. An effective threshold value can be set for the strength of the acquired vibration signal, interference below the threshold value and error signals caused by equipment vibration can be effectively inhibited, and the reliability of the product is improved. After the solid tuning fork switch is used for a certain time, the fork body can be abraded or adhered with materials to a certain extent, the vibration frequency can be changed, after the solid tuning fork switch is used for a period of time, the working state of the instrument can be judged whether to be normal or not through periodic self-checking of the button switch, and the instrument needs to be cleaned or replaced due to abnormal working state. The intelligent solid material level switch of the embodiment can automatically calibrate the optimal working frequency and record the original frequency and amplitude signals; performing self-checking periodically to judge whether the sensor needs to be maintained or replaced; automatically adjusting the resonance state to enable the working to be in the optimal state; the service life of the sensor is prolonged.

In summary, the embodiments of the present invention are merely exemplary and should not be construed as limiting the scope of the utility model. All equivalent changes and modifications made according to the content of the claims of the present invention should fall within the technical scope of the present invention.

Claims

1. An intelligence solid material level switch which characterized in that: the device comprises an MCU, a phase adjusting circuit, a signal secondary amplification and frequency measurement output circuit, a tuning fork material level sensor, a signal input and gain amplification circuit, a peak value sampling and holding circuit, an output module, an output alarm indicator lamp and a storage module; the MCU is electrically connected with the phase adjusting circuit, the peak value sampling and holding circuit, the storage module, the signal secondary amplification and frequency measurement output circuit, the output module and the output alarm indicator lamp; the signal secondary amplification and frequency measurement output circuit is electrically connected with the tuning fork material level sensor module, and when the tuning fork material level sensor does not vibrate, the signal secondary amplification and frequency measurement output circuit periodically outputs a vibration signal to the tuning fork material level sensor; tuning fork material level sensor includes vibration fork body, shell, housing screw, piezoceramics group, drive module and signal conductor, drive module with signal second grade is enlargied and frequency measurement output circuit electricity is connected, signal conductor with signal input and gain amplifier circuit electricity are connected, vibration fork body vibration back, tuning fork material level sensor detects vibration signal, and vibration signal passes through signal input and gain amplifier circuit transmit extremely behind the peak value sample hold circuit, the warp peak value sample hold circuit transmits extremely MCU handles, MCU handles the back control to vibration signal output module reaches output alarm indicator lamp work.

2. The intelligent solid level switch of claim 1, wherein: the phase adjusting circuit is electrically connected with the signal input and gain amplifying circuit, the MCU and the signal secondary amplification and frequency measurement output circuit, and the phase adjusting circuit adjusts the resonance state of the tuning fork material level sensor.

3. The intelligent solid level switch of claim 1, wherein: the output module is a relay.

4. The intelligent solid level switch of claim 1, wherein: the peak value sampling and holding circuit is used for setting a threshold value of the vibration signal, the vibration signal lower than the threshold value is interference, and the MCU judges the vibration signal to be an error signal.

5. The intelligent solid level switch of claim 1, wherein: the storage module is used for storing the vibration frequency and the vibration amplitude of the original vibration signal.