CN210719358U - Detection terminal for measuring material deposition - Google Patents
Detection terminal for measuring material deposition Download PDFInfo
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- CN210719358U CN210719358U CN201922049755.1U CN201922049755U CN210719358U CN 210719358 U CN210719358 U CN 210719358U CN 201922049755 U CN201922049755 U CN 201922049755U CN 210719358 U CN210719358 U CN 210719358U
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Abstract
The utility model relates to a detection terminal for measuring material deposition, which comprises a capacitance antenna, an insulation sheet and a capacitance measuring unit; the ratio S of the incident power and the reflected power of the signal source output by the capacitor antenna11Positively correlated with the thickness of the deposit in the tube; the insulating sheet is tightly attached to the bottom of the double sleeve, the capacitor antenna is fixed on the insulating sheet, the grounding end of the capacitor antenna is directly fixed at the bottom of the pipeline, and the bottom of the pipeline is grounded; the feed end of the capacitance antenna is led out of a tube wall through a wire to be connected with chip pins in the capacitance measuring unit, and the capacitance measuring unit is connected with an external data acquisition monitoring part through an SPI (serial peripheral interface). The detection terminal is based on capacitance effect, andthe device can detect the deposition amount of the double sleeves in unit area, and is suitable for long-distance and high-output pipelines.
Description
Technical Field
The utility model relates to a material deposit detects technical field, concretely relates to measure material deposit's detection terminal.
Background
Pneumatic conveying is widely applied to the industrial fields of electric power, food, mining, metallurgy, chemical industry, pharmacy and the like, and particularly, when double sleeves are used for conveying granular materials in a thermal power plant, large output and long-distance conveying of the materials can be realized. However, the deposition condition of the materials in the pipeline cannot be monitored in real time in the conveying process, when the deposition of the materials is too serious, the materials cannot be processed in time, and the system is completely paralyzed when the deposition of the materials is serious, so that the equipment safety is damaged. In order to ensure the safe operation of the conveying facility, the convenient and effective material detection terminal is inevitable.
At present, few structures for monitoring material deposition in a pipeline in pneumatic conveying exist in the market, a manual detection method is adopted for detecting the material deposition amount mostly, and remote wireless detection is also available, for example, a Chinese patent (with the patent number of 201210277057.7) provides a remote monitoring system and a detection method for the deposition amount of dust, a Fresnel lens is installed at the bottom of a dust deposition groove based on a photoelectric effect, and the deposition weight is converted according to the influence of dust deposition on light intensity change. However, the detection terminal is too complex, the occupied space is large, only a small amount of deposition can be monitored based on the photoelectric effect, and the detection terminal cannot be applied to a double-sleeve structure with high output and long-distance conveying.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art, the utility model provides a measure deposited detection terminal of material. A detection terminal is designed based on the capacitance effect, and the deposition amount of the double-sleeve pipe in unit area can be detected.
For solving the problem existing in the background art, the utility model adopts the following technical scheme: providing a detection terminal for measuring material deposition, wherein the detection terminal comprises a capacitance antenna, an insulation sheet and a capacitance measuring unit; the ratio S of the incident power and the reflected power of the signal source output by the capacitor antenna11Positively correlated with the thickness of the deposit in the tube; the insulating sheet is tightly attached to the bottom of the double sleeve, the capacitor antenna is fixed on the insulating sheet, the grounding end of the capacitor antenna is directly fixed at the bottom of the pipeline, and the bottom of the pipeline is grounded; the feed end of the capacitance antenna is led out of a tube wall through a wire to be connected with chip pins in the capacitance measuring unit, and the capacitance measuring unit is connected with an external data acquisition monitoring part through an SPI (serial peripheral interface).
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses design out test terminal based on electric capacity effect, when the material deposit at the electric capacity antenna on the surface, because the increase of electric capacity (the dielectric constant increase of antenna, electric capacity should increase also), the signal source incident power of output and reflected power than S11And the deposition amount of the material is calculated by changing the deposition amount and forming positive correlation change with the thickness of the deposition layer. The monitoring data is more accurate, and the range of monitoring deposition amount is larger compared with the original detection terminal designed based on the photoelectric effect.
2. The capacitive antenna is an area array type sensor, the working temperature range is-20 ℃ to 80 ℃, the capacitive antenna based on the gradient anisotropic zero-refractive-index material has good performance in the range of 9.5GHz to 12.5GHz, and the capacitive antenna has the advantages of easiness in manufacturing, integration, wide frequency band, portability and the like, and is simple in structure, small in occupied space and easy to install.
Drawings
In order to more clearly illustrate the design of the present invention, the present invention will be further described with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural view of a system of the present invention after a detection terminal for measuring material deposition is installed on site;
fig. 2 is a schematic structural view of a detection terminal for measuring material deposition according to the present invention;
fig. 3 is a schematic structural diagram of a capacitive antenna of a detection terminal for measuring material deposition according to the present invention;
fig. 4 is a schematic structural diagram of a PCAP02 chip of a detection terminal for measuring material deposition according to the present invention;
fig. 4 is a circuit diagram of a PCAP02 chip, and a feed terminal of a capacitor antenna is connected to any one of pins PC0-PC5 in the PCAP02 chip through a wire, and then is inserted into an SPI interface to transmit information. The information is obtained according to the discharge time of the capacitor antenna. The working principle is that when materials are deposited on the surface of the capacitor antenna 21, the resonance frequency point of the capacitor antenna 21 is increased due to the increase of the capacitance, which causes the frequency point of the capacitor antenna 21 to shift, and the ratio S of the incident power to the reflected power of the output signal source is11Is also changed therewith, and S11The value and the thickness of the deposition layer form positive correlation change, and then the deposition amount of the material can be calculated.
FIG. 5(a) is a data output interface diagram of the control software of the capacitance measuring unit of the detecting terminal for measuring material deposition according to the present invention,
FIG. 5(b) is a diagram of a capacitance measuring interface of the control software of the capacitance measuring unit of the detecting terminal for measuring material deposition according to the present invention,
FIG. 6 shows the S of the deposition layer thickness and the capacitive antenna of a detection terminal and a detection method for measuring material deposition11A graph of relationships between;
fig. 7 is a diagram of a relationship between a simulated experimental capacitor and a deposition mass of material particles in embodiment 2 of the detection terminal and the detection method for measuring material deposition according to the present invention;
fig. 8 is a schematic structural diagram of an embodiment of a capacitive antenna of a detection terminal for measuring material deposition according to the present invention.
In the figure, 1-pipeline, 2-detection terminal, 3-wired communication module, 4-external data acquisition monitoring part, 21-capacitance antenna, 22-insulation sheet, 23-PCAP02 chip and 24-SPI interface.
The specific implementation mode is as follows:
the technical solution of the present invention will be described in detail with reference to the accompanying drawings and examples, but the examples are only illustrative and are not intended to limit the scope of the present invention.
The utility model relates to a detection terminal for measuring material deposition (see figure 2) which comprises a capacitance antenna 21, an insulation sheet 22 and a capacitance measuring unit; the ratio S of the incident power and the reflected power of the signal source output by the capacitor antenna11Positively correlated with the thickness of the deposit in the tube; the insulating sheet is tightly attached to the bottom of the double sleeve, the capacitor antenna is fixedly placed on the insulating sheet, the grounding end of the capacitor antenna is directly fixed to the bottom of the pipeline, and the bottom of the pipeline is grounded; the feed end of the capacitive antenna is led out of the tube wall through a lead to be connected with chip pins in the capacitive measurement unit, and the capacitive measurement unit is connected with an external data acquisition monitoring part 4 through an SPI (serial peripheral interface);
the capacitance measuring unit comprises a PCAP02 chip 23 and a peripheral circuit thereof, and the feed end of the capacitance antenna 21 is connected to the input pin of the PCAP02 chip 23 through a lead; the external data acquisition monitoring part realizes communication through the SPI 24 and the wired communication module and timely acquires relevant data of the detection terminal.
The size of the insulating sheet 22 is the same as that of the capacitor antenna 21, the length of the insulating sheet is 14-16cm, the width of the insulating sheet is 10-12cm, the insulating sheet and the capacitor antenna are thin sheets and can be freely and completely attached to the inner wall of the pipeline, the grounding end of the capacitor antenna is connected with the bottom of the pipeline in a gluing mode, and the bottom of the pipeline is grounded. The feed end of the capacitance antenna 21 penetrates through the bottom of the pipeline to be connected with the outside, and deposition data are transmitted to the external data acquisition monitoring part 4 through the wired communication module 3 to be collected and processed. The capacitor antenna and the insulating sheet are very thin, the lead leading-out hole is very small, only the lead is allowed to come in and go out, and sealing treatment can be carried out outside the pipe wall after the lead is led out in the hole, so that powder leakage is avoided.
The capacitive antenna 21 is an area array type sensor, the working temperature range is-20 ℃ to 80 ℃, the capacitive antenna 21 based on the gradient anisotropy zero-refractive-index material has good performance in the range of 9.5GHz to 12.5GHz, and the capacitive antenna 21 has the advantages of easiness in manufacturing, integration, wide band, portability and the like.
Further, the distance between two adjacent detection terminals is 2-4 m.
Furthermore, the insulation sheet and the capacitor antenna are the same in size, the length is 14-16cm, the width is 10-12cm, the thickness is thinner, the thickness of the insulation sheet is 0.1-1mm, the thickness of the ultrathin flexible plastic sheet is 0.1-1mm, the capacitor antenna 21 is freely bendable, and the insulation sheet is connected with the bottom of the pipeline in a mode of being bonded with the pipe wall through glue.
The capacitive antenna is an arc-shaped gradient antenna, the outer contour of the capacitive antenna is rectangular, arc lines on the right side of the arc-shaped gradient antenna are in an outward convex shape and are symmetrically distributed along the center, the arc lines are 1/8 of the circumference where the diameter is 20-30cm, and an antenna grounding end is arranged at the intersection point of the outward convex arc lines; the feed end is arranged at the edge of the left side far away from the outer convex arc line.
The diameter of the double sleeve is 15-25 cm.
The functions of the detection terminal 2 are: (1) acquiring deposition position information, recording the position of a detection terminal, and numbering; (2) obtaining deposition parameter information: including variations in the thickness of the deposited layer, variations in capacitance.
A method of detecting the deposition of a material, comprising the steps of:
1) simulation acquisition of S for selected capacitive antenna by simulation software CST MWS 201511For the simulation software CST MWS 2015 is used to variably scan the antenna size and dielectric layer thickness to find the appropriate antenna shape, and S11The value is sensitive to the thickness variation of the dielectric layer, and S is further found11The antenna with the value positively correlated with the thickness of the deposition layer in the tube is used as a capacitive antenna for application test; when the material is deposited on the surface of the capacitive antenna, the charge-discharge time of the capacitive antenna is monitored through the capacitive measurement unit, and the change value of the corresponding capacitance can be obtained;
2) a PCAP02 chip manufactured by AMS sensor company and peripheral circuits thereof are used as a capacitance measuring unit, and a feed end of a capacitance antenna is connected to an input pin of the PCAP02 chip through a lead; the method comprises the steps of obtaining deposition parameters of a deposition position in real time through a capacitance measuring unit, recording the number of the current deposition position, including the current capacitance value of the deposition position, obtaining the current deposition quality according to the relation between capacitance and deposition quality, and finally calculating the thickness of a deposition layer in a current pipeline according to the relation between the deposition quality and density and volume;
3) the external data acquisition monitoring part acquires the data information of the capacitance measuring unit, further processes the data information, is applied to a field environment, and realizes real-time online monitoring and management of material deposition in the pipeline.
The utility model discloses a theory of operation does: the detection terminal is designed based on capacitance effect, the capacitance antenna can be equivalent to a capacitor, the insulation sheet is used for preventing short circuit of the front side and the back side of the antenna, when materials are deposited on the surface of the capacitance antenna 21, the resonance frequency point of the capacitance antenna 21 is increased along with the increase of the deposited capacitance of the materials, the frequency point of the capacitance antenna 21 is shifted, and the ratio S of the incident power to the reflected power of an output signal source is11Is also changed therewith, and S11The value and the thickness of the deposition layer form positive correlation change, and then the deposition amount of the material is calculated.
The utility model discloses well test terminal 2 can carry out the multiple spot setting, has a determining deviation between two arbitrary test terminal 2, according to actual conditions's difference, can set up two adjacent test terminal 2's interval into 2-4 m. The deposition data of a plurality of monitoring points can be gathered by the external data acquisition monitoring part. The external data acquisition monitoring part is not taken as a protection point of the application, and the prior art can be directly used.
The utility model provides a material is powdery material, and the sensitivity of detection is related to with the thickness of sedimentary deposit, and sedimentary deposit thickness is big more, and measuring sensitivity is lower more, and measuring scope is related to with electric capacity antenna's size, can set up electric capacity antenna's big or small specification according to actual need to satisfy actual measurement accuracy requirement. The utility model discloses a material that the sedimentary deposit thickness can be measured at 0-20cm at detection terminal, can satisfy double cannula's measurement demand.
Example 1
The detection terminal (see fig. 2) for measuring material deposition in the embodiment comprises a capacitance antenna 21 and an insulation sheet 22, wherein the insulation sheet 22 and the capacitance antenna 21 are the same in size, 16cm in length and 12cm in width, can be freely bent and connected with the bottom of a pipeline in a welding mode, a capacitance measurement unit PCAP02 chip 23 and a peripheral circuit thereof are connected with the capacitance measurement unit and communicated with an external data acquisition monitoring part through an SPI (serial peripheral interface) 24.
The capacitive antenna 21 is an arc-shaped gradient antenna, the outer contour of the capacitive antenna 21 is rectangular and mainly made of copper materials, a front electrode (feed end) is connected with one end of a lead, the connection position is arranged at the left edge of the arc-shaped gradient antenna, the lead is led out and penetrates through a pipe wall to be connected with any one of pins PC0-PC5 in the PCAP02 chip 23, and the PCAP02 chip 23 is inserted into the SPI interface 24 and then transmits deposition data through the wired communication module 3. The back electrode (grounding end) is connected with one end of a wire, the connecting position is arranged in a dotted line frame at the left edge of the arc-shaped gradient antenna, the wire is led out to be connected with the pipe wall, and the wire is led out from the pipe wall to be grounded. The right arc line of the arc gradual change antenna is convex and symmetrically distributed along the center, the arc line is 1/8 of the circumference with the diameter of 20-30cm, and the right arc line protrudes towards the symmetric axis of the antenna.
The capacitive antenna 21 may be implemented as a capacitor, and the capacitance value may be obtained by the PCAP02 chip control software, the PCAP02 chip control software interface is shown in fig. 5(a) - (b).
When the charging and discharging time of the capacitor antenna 21 is monitored, the corresponding capacitance can be obtained. The feed end of the capacitor antenna 21 is connected to any one of pins PC0-PC5 in the PCAP02 chip 23 through a wire, and then is inserted into the SPI interface 24 to transmit information. When the current deposition thickness is measured by the detection terminal, if the detected deposition thickness exceeds 3/4 of the diameter of the double sleeve, the deposition phenomenon is serious, and the treatment is needed, for example, the air pressure in the local air pipeline is enhanced, so that the deposition part is blown away, and the deposition blockage condition in the pipeline is avoided. FIG. 6 shows the S of the capacitive antenna 2111Numerical value (S)11Represents the return loss characteristic, represents the performance of the portion of the incident power reflected back to the signal source, and is defined as the ratio of the incident power to the reflected power. ) The relationship with the thickness of the deposited layer, it can be seen that as the thickness of the deposited layer is increasedIncrease in degree, S of the capacitive antenna 2111The numerical value shows an upward trend, which shows that the capacitance antenna 21 has good sensitivity and S11The value and the thickness of the deposition layer show a positive correlation change rule, which proves that the capacitance antenna 21 can meet the requirement of deposition measurement.
Example 2
The structure of this embodiment is the same as that of embodiment 1, except that the width of the insulation sheet 22 and the capacitance antenna 21 is 1cm, the length is 2cm, and the insulation sheet and the capacitance antenna are placed in a straight pipe section with a pipe diameter of 2 cm. By adopting the structure in the embodiment, the material (solid phase) accounts for 0.12 of the total volume fraction to carry out pneumatic transmission simulation experiment, and the pneumatic transmission simulation experiment is used for fitting the relation between the capacitance and the deposition quality.
Fig. 7 shows the relationship between the measured capacitance of the capacitive antenna 21 and the deposition mass of the material particles, and it can be seen that the capacitance value increases with the increase of the deposition mass of the material particles, and the relationship between the capacitance and the deposition mass is experimentally fitted to obtain y 23180x4+622293x3-66952x2+40373x+5*106Where y represents capacitance in pF and x represents deposition mass in g.
When the deposition mass of the material particles is between 0 and 0.6g, the capacitance value is very sensitive to the deposition of the material particles and the capacitance fluctuation range is large. However, in the deposition range of 0.6 to 1.0g, the increase in capacitance becomes gentle. This is mainly because the capacitance of the capacitive antenna 21 will have a reduced sensitivity to an increase in material particle deposits when the material particle deposits reach a certain thickness on the antenna surface. A formula which can be fitted according to the experiment is used for detecting the deposition quality of the double-sleeve material as reference, and a relational expression of capacitance and deposition quality is given, so that the aim of monitoring the deposition of the double-sleeve material in real time is fulfilled.
Example 3
The structure of each part of the detection terminal for measuring material deposition in this embodiment is the same as that in embodiment 1, except that the outer contour shapes of the insulation sheet and the capacitive antenna are circular structures, as shown in fig. 8.
The utility model discloses the nothing is mentioned the part and is applicable to prior art.
Claims (7)
1. A detection terminal for measuring material deposition is characterized by comprising a capacitance antenna, an insulation sheet and a capacitance measuring unit; the ratio S of the incident power and the reflected power of the signal source output by the capacitor antenna11Positively correlated with the thickness of the deposit in the tube; the insulating sheet is tightly attached to the bottom of the double sleeve, the capacitor antenna is fixed on the insulating sheet, the grounding end of the capacitor antenna is directly fixed at the bottom of the pipeline, and the bottom of the pipeline is grounded; the feed end of the capacitance antenna is led out of a tube wall through a wire to be connected with chip pins in the capacitance measuring unit, and the capacitance measuring unit is connected with an external data acquisition monitoring part through an SPI (serial peripheral interface).
2. The detection terminal of claim 1, wherein the insulation sheet and the capacitive antenna are the same in size, 14-16cm in length and 10-12cm in width, the insulation sheet and the capacitive antenna are both thin sheets which can be freely and completely attached to the inner wall of the pipeline, the grounding end of the capacitive antenna is connected to the bottom of the pipeline in a gluing manner, and the bottom of the pipeline is grounded.
3. The test terminal of claim 1, wherein the capacitive antenna wire is sealed outside the wall of the tube.
4. The test terminal of claim 1, wherein the capacitive antenna is an area array type sensor and has an operating temperature range of-20 ℃ to 80 ℃.
5. The detection terminal of claim 1, wherein the distance between two adjacent detection terminals is 2-4 m.
6. The testing terminal of claim 1, wherein said double cannula has a diameter of 15-25 cm.
7. The detection terminal according to claim 1, wherein the capacitive antenna is an arc-shaped gradient antenna, the outer contour of the capacitive antenna is rectangular, the arc-shaped lines on the right side of the arc-shaped gradient antenna are outward convex and symmetrically distributed along the center, the arc line is 1/8 of the circumference where the diameter is 20-30cm, and an antenna grounding end is arranged at the intersection point of the outward convex arc-shaped lines; the feed end is arranged at the edge of the left side far away from the outer convex arc line.
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| CN111220242A (en) * | 2019-11-25 | 2020-06-02 | 河北工业大学 | Detection terminal and detection method for measuring material deposition |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111220242A (en) * | 2019-11-25 | 2020-06-02 | 河北工业大学 | Detection terminal and detection method for measuring material deposition |
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