CN117968773A - Mining intrinsic safety type temperature vibration sensor - Google Patents
Mining intrinsic safety type temperature vibration sensor Download PDFInfo
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- CN117968773A CN117968773A CN202410355800.9A CN202410355800A CN117968773A CN 117968773 A CN117968773 A CN 117968773A CN 202410355800 A CN202410355800 A CN 202410355800A CN 117968773 A CN117968773 A CN 117968773A
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Abstract
The invention relates to a mining intrinsic safety type temperature vibration sensor. The sensor comprises a vibration conditioning circuit board, wherein the vibration conditioning circuit board comprises a plurality of components which are sequentially connected: the vibration IC circuit is used for converting a vibration acceleration signal into an acceleration voltage signal; an integrating circuit for converting the acceleration voltage signal into a velocity voltage signal; the vibration low-pass filter circuit is used for filtering clutter in the speed voltage signal; an effective value conversion circuit for adjusting the speed voltage signal to a predetermined range; and a vibration V-I conversion circuit for converting the speed voltage signal passing through the vibration low-pass filter circuit and the effective value conversion circuit into a vibration loop current signal. The piezoelectric vibration measuring module is used for monitoring the vibration signals of the large-scale equipment of the coal mine, and has the advantages of high precision and strong anti-interference capability.
Description
Technical Field
The invention relates to the field of mining sensors; in particular, the invention relates to a mining intrinsic safety type temperature vibration sensor.
Background
For large-scale equipment of colliery, especially the production operation of key equipment groups such as sealing-tape machine, lifting machine, ventilation blower, quick-witted pump need carry out strict supervision, need use different type sensor to gather different type information, and temperature vibration sensor can gather vibration acceleration and temperature, has received attention in recent years.
The existing intrinsic safety type temperature vibration sensor for mines has lower precision and cannot meet the work of mining environments with higher precision requirements. Also, the sensor has poor anti-interference ability and performs poorly in the face of strong electromagnetic interference or vibration interference. Meanwhile, due to severe conditions of mining environment, the life of the mining intrinsic safety type temperature vibration sensor is short, frequent replacement and maintenance are needed, and the workload of workers is increased. In addition, current mine intrinsic safety type temperature vibration sensors may require complex installation steps and conditions, increasing the manufacturing and installation costs of the sensors. Finally, the current mine intrinsic safety type temperature vibration sensor cannot meet the working and development requirements of mining production.
Disclosure of Invention
In view of the above, the present invention provides a mining intrinsic safety type temperature vibration sensor that solves or at least alleviates one or more of the above-mentioned and other problems of the prior art.
In order to achieve the above object, the present invention provides a mining intrinsic safety type temperature vibration sensor, wherein the sensor comprises a piezoelectric vibration measurement module and a temperature measurement module, the piezoelectric vibration measurement module comprises a vibration sensitive element and a vibration conditioning circuit board, the vibration sensitive element is used for converting a vibration acceleration signal into a charge signal, and the vibration conditioning circuit board comprises:
A vibration IC circuit for converting the vibration acceleration signal into an acceleration voltage signal;
an integrating circuit for converting the acceleration voltage signal into a velocity voltage signal;
The vibration low-pass filter circuit is used for filtering clutter in the speed voltage signal;
an effective value conversion circuit for adjusting the speed voltage signal to a predetermined range; and
A vibration V-I conversion circuit for converting a speed voltage signal passing through the vibration low-pass filter circuit and the effective value conversion circuit into a vibration loop current signal;
The temperature measuring module comprises a temperature IC, a temperature low-pass filter circuit and a temperature V-I conversion circuit which are sequentially connected, wherein the temperature IC is used for converting a temperature signal into a temperature voltage signal and adjusting the temperature voltage signal to a preset range, the temperature low-pass filter circuit is used for filtering clutters in the temperature voltage signal, and the V-I conversion circuit is used for converting the temperature voltage signal passing through the temperature low-pass filter circuit into a temperature loop current signal.
In the sensor as described above, optionally, the integrating circuit converts the acceleration voltage signal into the speed voltage signal by:
Where Ua is the acceleration voltage signal, uv is the velocity voltage signal, τ is the integration time constant.
In the sensor as described above, optionally, the piezoelectric vibration measurement module and the temperature measurement module operate independently.
In the sensor as described above, optionally, the sensor has a housing, the upper side of the housing is provided with a fixing thread, the fixing thread is provided with a mounting interface, and the mounting interface is used for fixing the sensor; the lower side of shell is provided with the base, signal interface has been seted up to the base, signal interface is used for installing the signal line.
In the sensor as described above, optionally, the signal interface includes a temperature signal output interface, a vibration speed signal output interface, a temperature power interface, and a vibration speed power interface, the temperature measurement module is configured to output the temperature loop current signal through the temperature signal output interface and supply power through the temperature power interface, and the piezoelectric vibration measurement module is configured to output the vibration loop current signal through the vibration speed signal output interface and supply power through the vibration speed power interface.
In the sensor as described above, optionally, the piezoelectric vibration measurement module adopts a faraday cage shielding structure, and an insulating material is disposed between the piezoelectric vibration measurement module and the housing, and the insulating material is used for isolating an interference signal.
In the sensor as described above, optionally, the temperature measurement module is encapsulated in a ceramic isolation cylinder, with a thermally conductive silicone between the ceramic isolation cylinder and the housing, the thermally conductive silicone being used to reduce the thermal resistance of air.
In the sensor as described above, optionally, the vibration sensitive element employs a piezoceramic shear structure for reducing transient temperature shock and base strain forces.
In the sensor as described above, optionally, a mass is provided inside the sensor, the mass being used to improve the quality of the sensor.
The invention provides a mining intrinsic safety type temperature vibration sensor, which monitors vibration signals of large-scale equipment of a coal mine through a piezoelectric vibration measurement module and has the advantages of high precision and strong anti-interference capability.
Drawings
The present disclosure will become more apparent with reference to the accompanying drawings. It is to be understood that these drawings are solely for purposes of illustration and are not intended as a definition of the limits of the invention. In the figure:
FIG. 1 is a schematic circuit diagram of one embodiment of a piezoelectric vibration measurement module of a mining intrinsic safety type temperature vibration sensor of the present invention;
FIG. 2 is a schematic circuit diagram of one embodiment of a temperature measurement module of the mining intrinsic safety type temperature vibration sensor of the present invention;
FIG. 3 is a front view of one embodiment of a mining intrinsic safety type temperature vibration sensor of the present invention;
FIG. 4 is a schematic diagram of one embodiment of a mining intrinsic safety type temperature vibration sensor of the present invention; and
Fig. 5 is a top view of the base in the embodiment shown in fig. 4.
Reference numerals: 1-fixing threads; 2-a mounting interface; 3-a base; 4-a temperature signal output interface; 5-a vibration speed signal output interface; 6-a temperature power interface; 7-a vibration speed power interface; 8-a shell.
Detailed Description
The structure, composition, characteristics, advantages and the like of a mining intrinsic type temperature vibration sensor of the present invention will be described below by way of example with reference to the accompanying drawings and specific embodiments, however, all descriptions should not be construed as limiting the present invention in any way.
Furthermore, to the extent that any individual feature described or implied in the embodiments set forth herein, or any individual feature shown or implied in the figures, the invention still allows any combination or deletion of such features (or equivalents thereof) without any technical hurdle, and further embodiments according to the invention are considered to be within the scope of the disclosure herein.
It should also be noted that the terms "inner," "outer," and the like indicate an orientation or positional relationship based on the sensor shown in the drawings, and are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present disclosure.
In the coal mine production process, the rolling bearing is a part of key parts such as a motor and a speed reducer of large equipment in production operation, and most of mechanical faults of rotating equipment are caused by the damage of the rolling bearing. The large-scale equipment of the coal mine is monitored in real time, hidden trouble faults can be timely found out to prevent the hidden trouble faults in advance, blindness of maintenance equipment can be reduced, damage of associated equipment is reduced, and accordingly safety of workers is guaranteed.
The vibration sensor can be used for long-term monitoring of vibration and displacement of machinery such as rolling bearings, thermal expansion of a rotor and a shell, and the like, can be used for on-line automatic detection and automatic control of a production line, and can be widely applied to the fields of energy, chemical industry, medicine, automobiles, metallurgy, machine manufacturing, military industry, scientific research and teaching, and the like, and various micro-distance and micro-motion measurement in scientific research and the like.
Fig. 1 is a schematic circuit diagram of an embodiment of a piezoelectric vibration measurement module of a mining intrinsic safety type temperature vibration sensor of the present invention. As can be seen from fig. 1, the piezoelectric vibration measurement module may include a vibration sensitive element and a vibration conditioning circuit board, where the vibration conditioning circuit board may include a vibration IC circuit, an integrating circuit, a vibration low-pass filter circuit, an effective value conversion circuit, and a vibration V-I conversion circuit that are sequentially connected, and the vibration sensitive element is used to convert a vibration acceleration signal into a charge signal; the vibration IC circuit is used for converting a vibration acceleration signal into an acceleration voltage signal; the integrating circuit is used for converting the acceleration voltage signal into a speed voltage signal; the low-pass filter circuit is used for filtering clutter in the speed voltage signal; the effective value conversion circuit is used for adjusting the speed voltage signal to a preset range; the vibration V-I converting circuit is used for converting the speed voltage signal passing through the vibration low-pass filtering circuit and the effective value converting circuit into a vibration loop current signal.
As can also be seen from fig. 1, the piezoelectric vibration measurement module is connected to a power supply V cc and outputs a signal to the outside. In this embodiment, the charge output end of the vibration sensitive element is connected with a vibration IC circuit taking a field effect transistor as a core as a first stage, the circuit can convert a charge signal into a low-impedance acceleration voltage signal, then the acceleration voltage signal sequentially passes through an integrating circuit, a low-pass filter circuit, an effective value conversion special IC and a V-I conversion IC circuit, and finally a loop 4-20 mA current is output.
Specifically, the vibration IC circuit, the integrating circuit, the vibration low-pass filter circuit, the effective value conversion circuit and the vibration V-I conversion circuit are integrated on the vibration conditioning circuit board, and the vibration sensitive element can receive the vibration acting force. When the vibration frequency of the vibration acting force of the device is lower than the natural resonance frequency of the piezoelectric vibration measuring module, the vibration acceleration signal can be calculated by f=m×a, wherein F is acting force, m is mass of the vibration part in the piezoelectric vibration measuring module, in this embodiment, the vibration sensitive element can be made of PZT material using positive piezoelectric effect of crystal material, when the vibration sensitive element is subjected to stress or deformation in a certain direction, the polarization surface of the vibration sensitive element generates corresponding charges, and the high-resistance charge signal proportional to acting force is generated on the surface of the piezoelectric crystal, so q=d×f exists. Where d is the piezoelectric constant of the piezoelectric element and Q is the charge amount.
When a measured acceleration amount applies force to two ends of the vibration sensitive element through the inertial element, the generated charge amount is delta Q, and the capacitance connected in parallel to two ends of the vibration sensitive element in the vibration IC circuit is C, then an open-circuit voltage delta V is generated at two ends of the piezoelectric element, and the relationship among three quantities can be obtained by the electrostatics law:
△V = △Q / C，
In summary, an acceleration voltage signal can be calculated, and because the capacitance value is small, the capacitance resistance is large, and the voltage DeltaV and the charge DeltaQ are high-impedance signals, when the high-impedance charge signals pass through a vibration IC circuit in the sensor, the high-impedance charge signals are converted into acceleration voltage signals with low impedance output, and then enter an integrating circuit and are converted into speed voltage signals by the following method:
，/>，
Where V is the velocity signal, ua is the acceleration voltage signal, uv is the velocity voltage signal, and τ is the integration time constant.
After the speed voltage signal enters the vibration low-pass filter circuit to be filtered, in order to enable the electric signal finally output by the sensor to be in a preset range, the output electric signal can directly enter various instruments with current to be read or recorded, and an effective value conversion circuit and a vibration V-I conversion circuit are arranged behind the integration circuit to respectively perform effective value conversion and voltage-to-current conversion.
Fig. 2 is a schematic circuit diagram of an embodiment of a temperature measurement module of the mining intrinsic safety type temperature vibration sensor of the present invention. As can be seen from fig. 2, the temperature measurement module may include a temperature IC, a temperature low-pass filter circuit, and a temperature V-I conversion circuit connected in sequence. In addition, the piezoelectric vibration measuring module is connected to the power V cc and outputs a signal to the outside.
Specifically, the temperature IC receives the temperature signal and converts the temperature signal into a temperature voltage signal, the temperature voltage signal is adjusted to a preset range, then the temperature voltage signal enters a temperature low-pass filter circuit for filtering, finally the temperature voltage signal is converted into a temperature loop current signal which can directly enter various meters with current for reading or recording through a V-I conversion circuit, and the temperature measuring module and the piezoelectric vibration measuring module work independently.
Fig. 3 is a front view of one embodiment of the mining intrinsic safety type temperature vibration sensor of the present invention. Fig. 4 is a schematic structural view of an embodiment of the mining intrinsic safety type temperature vibration sensor of the present invention.
As can be understood from fig. 3 and 4, the external structure of the sensor may include a cylindrical housing 8, a base 3, and a fixing screw 1, the fixing screw 1 is disposed on the upper side of the housing, the fixing screw 1 is provided with a mounting interface 2 for fixing the sensor, the base 3 is disposed on the lower side of the housing, and the base 3 is provided with a signal interface for mounting a signal line.
Fig. 5 is a top view of the base 3 in the embodiment shown in fig. 4. As can be seen from fig. 5, the model interface provided by the hexagonal base 3 may include a temperature signal output interface 5, a vibration speed signal output interface 5, a temperature power interface 6 and a vibration speed power interface 7, where the temperature measuring module outputs a temperature loop current signal through the temperature signal output interface 5 and is powered by the temperature power interface 6, and the piezoelectric vibration measuring module outputs a vibration loop current signal through the vibration speed signal output interface 5 and is powered by the vibration speed power interface 7.
As a sensor for dynamic measurement, the mounting technique is extremely important in engineering implementation, and improper mounting may cause distortion of measured data, sometimes even impossible to measure. In order to make the vibration speed data accurate and the use convenient, the sensor should be installed in a correctly fastened manner according to the sensitive direction. The fastening installation mode has the following several alternatives.
1) Screw mounting mode
The bottom surface of the sensor should be kept smooth, a layer of grease or wax oil is preferably coated between the sensor and the joint surface of the measured object to increase the contact stiffness, and then the sensor is fastened and installed by a nominal screw to obtain the frequency response characteristic of the calibration of the transmitter. The recommended installation torque for screw installation is 3n·m.
2) Adhesive mounting mode
When the measured object does not allow drilling, adhesives allowed by equipment owners, such as quick-drying adhesives like 502, 454, etc., or other adhesives like epoxy resin adhesives, double-sided adhesive tapes, etc. can be used. The adhesive mounting has a certain influence on the frequency characteristic and the amplitude characteristic of the sensor, sometimes the measuring error is unacceptable, the influence of the change of multiple temperatures of the adhesive mounting is sensitive, and the adhesive mounting is carefully selected according to the actual conditions of engineering.
3) Magnetic attraction seat mode
The method for mounting the magnetic attraction seat can lead the upper limit of the frequency response of the vibration speed sensor to be reduced and the low frequency response to be abnormal, the vibration speed sensor should be used with caution, the mounting measurement range is easy to be limited by adopting the method, the magnetic attraction force is greatly influenced by temperature, and the magnetic pole capability is rapidly degraded after reaching a certain temperature, so that the vibration speed sensor is known and carefully selected.
In addition, in order to provide the sensor of the present invention with advantages of long life and high anti-interference capability, in this embodiment, the piezoelectric vibration measuring module may employ a faraday cage shielding structure, and an insulating material for isolating interference signals may be provided between the piezoelectric vibration measuring module and the housing 8, thereby improving anti-interference performance and reliability. The temperature measurement module can be packaged in a ceramic isolation cylinder, and heat conduction silicone grease for reducing air thermal resistance can be arranged between the ceramic isolation cylinder and the shell 8, so that the temperature of an internal circuit of the sensor is timely reduced, and the service life of the sensor is prolonged.
In this embodiment, the vibration sensitive element may adopt a piezoelectric ceramic shear structure for reducing the instantaneous temperature impact and the strain of the base 3, and the sensor of this structural mode has the characteristics of high sensitivity, small lateral sensitivity, small base strain, small volume, and small weight, and compared with the compression structure, the sensor of this structural mode is less affected by the instantaneous temperature impact and the base strain, and has higher reliability.
The temperature measuring module can adopt an integrated chip, and has the characteristics of small volume, calibrated sensitivity and easy packaging. In this embodiment, the temperature measuring module may be first packaged in a ceramic isolation cylinder to form a temperature sensitive component, and then the component is embedded into a tapered slot hole for sensing the temperature at the bottom of the sensor, and the space between the bottom of the component and the housing 8 is filled with heat-conducting silicone grease, so as to reduce the thermal resistance of air and achieve rapid heat conduction. The structure has the characteristics of quick heat conduction, accurate temperature measurement and high isolation, thereby further improving the reliability.
In order to improve the accuracy of the sensor in measuring the vibration acceleration, a mass block with large mass for improving the mass of the sensor is arranged in the sensor, the larger the mass is, the smaller the natural resonance frequency is, the smaller the measuring range of the vibration acceleration measured by the sensor is, and the higher the accuracy of the sensor is.
In summary, the invention provides the mine intrinsic safety type temperature vibration sensor, the piezoelectric vibration measurement module and the temperature measurement module are used for monitoring the vibration signal and the temperature signal of large-scale equipment of a coal mine, so that the vibration acceleration signal and the temperature signal can be monitored simultaneously, and the sensor has the advantages of high precision, long service life and strong anti-interference capability through a specific packaging structure.
The technical scope of the present invention is not limited to the above description, and those skilled in the art may make various changes and modifications to the above-described embodiments without departing from the technical spirit of the present invention, and these changes and modifications should be included in the scope of the present invention.
Claims (9)
1. The utility model provides a mining intrinsic safety type temperature vibration sensor, its characterized in that, the sensor includes piezoelectric type vibration measurement module and temperature measurement module, piezoelectric type vibration measurement module includes vibration sensitization piece and vibration conditioning circuit board, vibration sensitization piece is used for converting vibration acceleration signal into charge signal, vibration conditioning circuit board includes that the order is connected:
A vibration IC circuit for converting the vibration acceleration signal into an acceleration voltage signal;
an integrating circuit for converting the acceleration voltage signal into a velocity voltage signal;
The vibration low-pass filter circuit is used for filtering clutter in the speed voltage signal;
an effective value conversion circuit for adjusting the speed voltage signal to a predetermined range; and
A vibration V-I conversion circuit for converting a speed voltage signal passing through the vibration low-pass filter circuit and the effective value conversion circuit into a vibration loop current signal;
The temperature measuring module comprises a temperature IC, a temperature low-pass filter circuit and a temperature V-I conversion circuit which are sequentially connected, wherein the temperature IC is used for converting a temperature signal into a temperature voltage signal and adjusting the temperature voltage signal to a preset range, the temperature low-pass filter circuit is used for filtering clutters in the temperature voltage signal, and the V-I conversion circuit is used for converting the temperature voltage signal passing through the temperature low-pass filter circuit into a temperature loop current signal.
2. The sensor of claim 1, wherein the integrating circuit converts the acceleration voltage signal to the velocity voltage signal by:
Where Ua is the acceleration voltage signal, uv is the velocity voltage signal, τ is the integration time constant.
3. The sensor of claim 1, wherein the piezoelectric vibration measurement module and the temperature measurement module operate independently.
4. A sensor according to any one of claims 1 to 3, characterized in that the sensor has a housing (8), the upper side of the housing (8) being provided with a fixing thread (1), the fixing thread (1) being provided with a mounting interface (2), the mounting interface (2) being used for fixing the sensor; the lower side of shell (8) is provided with base (3), signal interface has been seted up to base (3), signal interface is used for installing the signal line.
5. The sensor according to claim 4, wherein the signal interface comprises a temperature signal output interface (4), a vibration speed signal output interface (5), a temperature power interface (6) and a vibration speed power interface (7), the temperature measurement module is configured to output the temperature loop current signal through the temperature signal output interface (4) and to supply power through the temperature power interface (6), and the piezoelectric vibration measurement module is configured to output the vibration loop current signal through the vibration speed signal output interface (5) and to supply power through the vibration speed power interface (7).
6. The sensor according to claim 4, characterized in that the piezoelectric vibration measuring module is of a faraday cage shielding structure, and that an insulating material is arranged between the piezoelectric vibration measuring module and the housing (8), said insulating material being used for isolating interference signals.
7. The sensor according to claim 4, characterized in that the temperature measuring module is enclosed in a ceramic isolation cylinder, between which a heat-conducting silicone grease is arranged for reducing the thermal resistance of the air.
8. The sensor according to claim 4, characterized in that the vibration-sensitive element adopts a piezoceramic shear structure for reducing transient temperature shocks and base (3) strain forces.
9. The sensor of claim 4, wherein a mass is disposed within the sensor, the mass being configured to enhance the mass of the sensor.
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| CN202410355800.9A CN117968773A (en) | 2024-03-26 | 2024-03-26 | Mining intrinsic safety type temperature vibration sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410355800.9A CN117968773A (en) | 2024-03-26 | 2024-03-26 | Mining intrinsic safety type temperature vibration sensor |
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