Piezoelectric sensor rapid installation device for pipeline detection

By designing a quick installation device for piezoelectric sensors for pipeline detection, the problem of large workload of PZT sheet installation in the prior art is solved, efficient and accurate multi-piece PZT installation is achieved, and the application efficiency of pipeline monitoring site is improved.

CN222939061UActive Publication Date: 2025-06-03GUANGDONG INSPECTION & RES INST OF SPECIAL EQUIP ZHUHAI INSPECTION INST
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202421355095.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-14
Publication Date
2025-06-03
Estimated Expiration
2034-06-14

AI Technical Summary

Technical Problem

The lack of a device that can quickly install multiple PZT sheets in the prior art, resulting in a large installation workload, limiting the application of ultrasonic waveguide technology in pipeline monitoring sites.

Method used

A quick installation device for pipe detection is designed, including a mounting frame, first and second mounting holes, a compression module assembly and a polyimide resistive heating film. By presetting the mounting position hole of the PZT sheet, using hot melt adhesive as the adhesive material, and using the magnetic suction force between the electromagnet and the pipeline, the PZT sheet is pressed to the surface of the pipeline to ensure the adhesion quality.

Benefits of technology

The pasting and fixing of multiple PZT pieces is achieved at one time, which significantly improves the installation efficiency and has the advantages of accurate positioning and high installation efficiency. At the same time, the number of PZT pieces installed at one time can be flexibly adjusted as needed.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN222939061U_ABST
    Figure CN222939061U_ABST
Patent Text Reader

Abstract

The utility model relates to the technical field of ultrasonic nondestructive testing, in particular to a quick mounting device of a piezoelectric sensor for pipeline detection, which can be used for sticking and fixing a plurality of PZTs at one time, so that the mounting efficiency is effectively improved. In the rapid installation device of the piezoelectric sensor for pipeline detection, a first installation hole of an installation frame is used for positioning a piezoelectric patch, and a second installation hole is used for installing and positioning a hot melt glue stick; a pressing module assembly sequentially composed of a top cover, a spring and an electromagnet is installed in the first installation hole. When the electromagnet is not electrified, the spring is in a tensioning state, and the lower surface of the electromagnet is close to the outer surface of the pipeline and is not in contact with the pipeline; a polyimide resistance heating film is embedded into a groove in the inner side of the second mounting hole, and the hot melt glue stick is heated under the control of an external controller and is in a molten state; a glue guide hole which is inclined downwards is communicated between the first mounting hole and the second mounting hole, and hot melt glue in a molten state is injected into a gap between the piezoelectric plate and the pipeline through the glue guide hole.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model relates to the technical field of ultrasonic non-destructive testing, in particular to a quick installation device for piezoelectric sensors used in pipeline detection. Background Art

[0002] At present, as a conveying medium for gas and liquid materials, pipeline systems have been widely used in industries such as petroleum, chemical engineering, and municipal engineering.

[0003] However, during long-term service, corrosion, cracking and other damages will inevitably occur on the inner and outer surfaces of pipelines; therefore, long-term monitoring of the damage condition is an important means to ensure the safe operation of pipeline systems.

[0004] In the prior art, longitudinal ultrasonic guided waves are excited and received in the monitored pipeline by using distributed PZT (piezoelectric ceramic chips) sensors. By analyzing the signal characteristics of the pipeline echoes, long-term on-line monitoring of pipelines within a range of dozens of meters can be realized. Specifically, the ultrasonic guided wave transmitting and receiving sensors used in this monitoring method are length-expansion type piezoelectric ceramic wafers (PZT wafers). A plurality of PZT wafers are evenly distributed along the circumferential direction of the pipeline to form an annular structure for transmitting and receiving ultrasonic guided waves. Moreover, the PZT wafers and the monitored pipeline are fixed by means of glue pasting; in the same transmitting or receiving PZT ring, the number of PZT wafers is large, and the pasting positions need to be accurately controlled; at the same time, a plurality of PZT rings need to be arranged along the length direction of the pipeline at the pipeline monitoring site. However, the installation workload of the PZT rings is large, which severely limits the application of ultrasonic guided wave technology at the pipeline monitoring site.

[0005] Therefore, the inventors of the present application found that in the prior art, there is a lack of a quick installation device for PZT wafers, which can realize the quick installation of a plurality of PZT wafers on the premise of ensuring the position accuracy of the PZT. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a quick installation device for piezoelectric sensors used in pipeline detection, which can complete the pasting and fixing of multiple PZT at one time, thereby effectively improving the installation efficiency; moreover, it has the advantages of accurate positioning and high installation efficiency, and at the same time, the number of PZT wafers installed at one time can be flexibly adjusted according to needs.

[0007] To achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A quick installation device for piezoelectric sensors used in pipeline detection, comprising: a mounting frame assembled on the pipeline, and the mounting frame is provided with a first mounting hole and a second mounting hole; the first mounting hole is used for positioning the piezoelectric wafer, and the second mounting hole is used for positioning the adjacent hot melt adhesive stick.

[0009] A pressing module assembly is installed inside the first mounting hole, and the pressing module assembly includes a top cover and an electromagnet connected to the top cover by a spring; when the electromagnet is not energized, the spring is in a tensioned state, and at this time, the lower surface of the electromagnet is close to but does not contact the outer surface of the pipeline.

[0010] A polyimide resistive heating film is embedded in the inner groove of the second mounting hole, and under the control of an external controller, it heats the hot melt adhesive stick to make the hot melt adhesive stick reach a molten state.

[0011] An inclined downward glue guiding hole is communicated between the first mounting hole and the second mounting hole, and the molten hot melt adhesive is injected into the gap between the piezoelectric sheet and the pipeline through the glue guiding hole.

[0012] In actual application, the first mounting hole has an internal thread, the top cover has an external thread, and the external thread is adapted to the internal thread; the pressing module assembly is assembled and connected through the external thread of the top cover and the internal thread of the first mounting hole.

[0013] Among them, the type of the hot melt adhesive stick is selected as a low melting point hot melt adhesive.

[0014] Specifically, the hot melt adhesive stick is selected as an EVA hot melt adhesive.

[0015] Further, a lead hole is processed on the top of the top cover, and the lead hole is used to lead out the wire of the electromagnet.

[0016] Even further, the materials of the top cover and the mounting bracket are both aluminum alloy.

[0017] In actual application, the chip model of the external controller is STC32F12K54, and the pins of the chip are connected to the pins of the thermistor.

[0018] Among them, the model of the thermistor is NTC10K, which is placed inside the second mounting hole and closely adheres to the polyimide resistive heating film for monitoring the temperature of the heating film.

[0019] Specifically, the model of the optocoupler is TLP521, and the optocoupler is used to control the on-off of the power supply circuits of the electromagnet and the resistive heating film.

[0020] Compared with the prior art, the piezoelectric sensor quick installation device for pipeline detection of the present utility model has the following advantages:

[0021] The quick installation device for piezoelectric sensors used in pipeline detection provided by the present utility model, since the installation positions of PZT chips are pre-set on the mounting frame, uses hot melt adhesive as the bonding material, and utilizes a polyimide electrothermal PI film to heat the hot melt adhesive stick; fills the melted hot melt adhesive into the interface between the PZT chip and the monitored pipeline; utilizes the magnetic attraction force between the electromagnet and the pipeline to press the PZT chip against the surface of the monitored pipeline; during the curing stage of the hot melt adhesive, continuously presses the PZT chip to ensure the bonding quality of the PZT chip. Therefore, the pasting and fixing of multiple PZT chips can be completed at one time, thus effectively improving the installation efficiency; moreover, it has the advantages of accurate positioning and high installation efficiency, and the number of PZT chips installed at one time can be flexibly adjusted according to needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the quick installation device for piezoelectric sensors used in pipeline detection provided by an embodiment of the present utility model;

[0023] Figure 2 is a schematic structural diagram of the pressing module assembly in the quick installation device for piezoelectric sensors used in pipeline detection provided by an embodiment of the present utility model.

[0024] REFERENCE SIGNS:

[0025] 1 - pipeline; 2 - mounting frame; 3 - first mounting hole; 4 - second mounting hole; 5 - glue guiding hole; 6 - top cover; 61 - lead hole; 7 - spring; 8 - electromagnet; 9 - pressing module assembly. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] For the convenience of understanding, the quick installation device for piezoelectric sensors used in pipeline detection provided by an embodiment of the present utility model will be described in detail below with reference to the accompanying drawings of the specification.

[0027] An embodiment of the present utility model provides a quick installation device for piezoelectric sensors used in pipeline detection, as Figure 1 and Figure 2 shown, including: a mounting frame 2 assembled on the pipeline 1, and the mounting frame 2 is provided with a first mounting hole 3 and a second mounting hole 4; the first mounting hole 3 is used for positioning the piezoelectric chip, and the second mounting hole 4 is used for positioning the adjacent hot melt adhesive stick for installation;

[0028] A pressing module assembly 9 is installed inside the first mounting hole 3, and the pressing module assembly 9 includes a top cover 6 and an electromagnet 8 connected to the top cover 6 through a spring 7; when the electromagnet 8 is not powered on, the spring 7 is in a tensioned state, and at this time, the lower surface of the electromagnet 8 is close to the outer surface of the pipeline 1 and the two do not contact;

[0029] A polyimide resistive heating film is embedded in the inner groove of the second mounting hole 4, and under the control of an external controller, it heats the hot melt adhesive rod to make the hot melt adhesive rod reach a molten state;

[0030] A glue guiding hole 5 inclined downward is communicated between the first mounting hole 3 and the second mounting hole 4, and the molten hot melt adhesive is injected into the gap between the piezoelectric sheet and the pipeline 1 through the glue guiding hole 5.

[0031] Compared with the prior art, the piezoelectric sensor quick installation device for pipeline detection described in the embodiment of the present utility model has the following advantages:

[0032] The piezoelectric sensor quick installation device for pipeline detection provided by the embodiment of the present utility model, because the mounting position holes for PZT sheets are preset on the mounting frame, uses hot melt adhesive as the bonding material, and heats the hot melt adhesive rod by using a polyimide electrothermal PI film; fills the molten hot melt adhesive into the interface between the PZT sheet and the pipeline to be monitored; utilizes the magnetic attraction force between the electromagnet and the pipeline to press the PZT sheet tightly onto the surface of the pipeline to be monitored; during the curing stage of the hot melt adhesive, continuously presses the PZT sheet to ensure the bonding quality of the PZT sheet. Therefore, the pasting and fixing of multiple PZT sheets can be completed at one time, thereby effectively improving the installation efficiency; and it has the advantages of accurate positioning and high installation efficiency, and at the same time, the number of PZT sheets installed at one time can be flexibly adjusted according to needs.

[0033] During actual application, the first mounting hole 3 may have an internal thread, the top cover 6 may have an external thread, and the external thread is adapted to the internal thread; the pressing module assembly 9 can be assembled and connected through the external thread of the top cover 6 and the internal thread of the first mounting hole 3.

[0034] Among them, the type of the above-mentioned hot melt adhesive rod can be preferably a low melting point hot melt adhesive, so as to effectively prevent damage to the piezoelectric sheet caused by too high melting temperature of the hot melt adhesive.

[0035] Specifically, the above-mentioned hot melt adhesive rod can preferably use EVA hot melt adhesive.

[0036] Furthermore, as Figure 2 shown, a lead hole 61 can be machined at the top of the above-mentioned top cover 6, and the lead hole 61 can be used to lead out the wire of the electromagnet 8.

[0037] Even further, the materials of the above-mentioned top cover 6 and the mounting frame 2 can both be aluminum alloy.

[0038] In actual application, the chip model of the above external controller can be STC32F12K54, and the pins of this chip are connected to the pins of the thermistor to collect the changes of the thermistor in real time. As the temperature of the heating film rises, the resistance value of the thermistor decreases. When the resistance value of the thermistor drops to the set value, it indicates that the heating film has reached the required melting temperature of the hot melt adhesive stick. After keeping warm for a certain period of time, the chip of the external controller will cut off the power supply circuit of the heating film and stop heating.

[0039] Among them, the model of the above thermistor can be NTC10K, which is placed inside the second mounting hole 4 and closely attached to the polyimide resistive heating film to monitor the temperature of the heating film.

[0040] Specifically, the model of the optocoupler can be TLP521, and this optocoupler is used to control the on-off of the power supply circuits of the electromagnet and the resistive heating film. One side of the optocoupler is respectively connected to the first pin, the second pin, the third pin, and the fourth pin of the chip. The first pin and the second pin are respectively the control pins of the two electromagnets, and the third pin and the fourth pin are respectively the control pins of the two heating films. When the control pins (the first pin, the second pin, the third pin, and the fourth pin) output a low-level signal, the power supply circuits of the electromagnet or the heating film are turned on, the electromagnet has magnetism, and the heating film starts to heat. When the control pins (the first pin, the second pin, the third pin, and the fourth pin) output a high-level signal, the power supply circuits of the electromagnet or the heating film are cut off.

[0041] The following will describe in detail the usage process of the piezoelectric sensor quick installation device for pipeline detection provided by the embodiments of the present invention with reference to the accompanying drawings:

[0042] Assemble the pressing module assembly 9, connect the top cover 6, the spring 7, and the electromagnet 8 in sequence, and pass the wire of the electromagnet through the lead hole 61 of the top cover 6;

[0043] Install the pressing module assembly 9 in the first mounting hole 3 of the mounting frame 2, and connect the top cover 6 and the first mounting hole 3 by threads;

[0044] Use double-sided tape to fix the multiple piezoelectric wafers to the bottom of the multiple electromagnets 8 respectively;

[0045] Use thermal conductive silicone to paste the thermistor on the surface of the polyimide resistive heating film, install the polyimide resistive heating film in the groove inside the second mounting hole 4, and insert the hot melt adhesive stick into the second mounting hole 4;

[0046] Connect the wires of the electromagnet 8 and the resistive heating film to the control circuit of the external controller respectively;

[0047] Place the mounting bracket 2 at the position of the PZT sheet to be installed on the pipeline 1;

[0048] Connect the +12V lithium-ion power supply to the +12V power supply interface in the control circuit, press the control switch of the chip to turn on the control system of the quick installation device; send instructions through the pins of the chip to turn on the power supply circuit of the resistive heating film, and at the same time dynamically collect the resistance value of the thermistor through the pins of the chip, so as to realize the monitoring of the heating temperature of the resistive heating film; when the heating temperature of the resistive heating film reaches the melting temperature of the hot melt adhesive stick, keep the power supply circuit of the resistive heating film in the on state for a certain period of time, and the melted hot melt adhesive flows into the bottom of the pressing module assembly 9 through the glue guiding hole 5, covering the surface of the piezoelectric sheet and the pasting part of the pipeline belt;

[0049] After the liquid hot melt adhesive completely covers the gap between the piezoelectric sheet and the pipeline 1 to be detected, the chip sends instructions through the pins to turn on the power supply circuit of the electromagnet 8, and presses the piezoelectric sheet onto the surface of the pipeline 1 by relying on the magnetic force between the electromagnet 8 and the pipeline 1 to be detected; at the same time, the chip sends instructions through the pins to turn off the power supply circuit of the resistive heating film, and the hot melt adhesive enters the curing stage;

[0050] After the hot melt adhesive is completely cured, the chip sends instructions through the pins to cut off the power supply circuit of the electromagnet 8, and pulls up the electromagnet 8 by relying on the elastic force of the spring 7;

[0051] After completing one installation, use double-sided tape to paste the PZT to the bottom of the electromagnet 8 again, move the mounting bracket 2 to the next installation position of the pipeline 1 to be detected, and continue the next installation.

[0052] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of changes or substitutions, which should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A quick installation device for a piezoelectric sensor for pipeline detection, characterized in that: include: A mounting frame assembled on the pipe, wherein the mounting frame is provided with a first mounting hole and a second mounting hole; the first mounting hole is used for positioning the piezoelectric sheet, and the second mounting hole is used for positioning the adjacent hot melt adhesive stick; A compression module assembly is installed inside the first mounting hole, and the compression module assembly includes a top cover and an electromagnet connected to the top cover via a spring; when the electromagnet is not energized, the spring is in a tensioned state, and at this time, the lower surface of the electromagnet is close to the outer surface of the pipe and the two are not in contact; A polyimide resistance heating film is embedded in the inner groove of the second mounting hole, and the hot melt glue stick is heated under the control of an external controller to make the hot melt glue stick reach a melting state; A glue guide hole inclined downward is connected between the first mounting hole and the second mounting hole, and hot melt glue in a molten state is injected into the gap between the piezoelectric sheet and the pipeline through the glue guide hole.

2. The quick installation device of piezoelectric sensor for pipeline detection according to claim 1 is characterized in that: The first mounting hole has an internal thread, the top cover has an external thread, and the external thread is matched with the internal thread; the clamping module assembly is assembled and connected via the external thread of the top cover and the internal thread of the first mounting hole.

3. The quick installation device of a piezoelectric sensor for pipeline detection according to claim 1 or 2, characterized in that: The type of the hot melt glue stick is selected as low melting point hot melt glue.

4. The quick installation device of piezoelectric sensor for pipeline detection according to claim 3 is characterized in that: The hot melt glue stick is made of EVA hot melt glue.

5. The quick installation device of a piezoelectric sensor for pipeline detection according to claim 1 or 2, characterized in that: A lead hole is processed on the top of the top cover, and the lead hole is used to lead out the lead wire of the electromagnet.

6. The quick installation device of piezoelectric sensor for pipeline detection according to claim 5, characterized in that: The top cover and the mounting frame are both made of aluminum alloy.

7. The quick installation device of piezoelectric sensor for pipeline detection according to claim 1, characterized in that: The chip model of the external controller is STC32F12K54, and the pins of the chip are connected to the pins of the thermistor.

8. The quick installation device for a piezoelectric sensor for pipeline detection according to claim 7, characterized in that: The thermistor is of model NTC10K, which is placed inside the second mounting hole and in close contact with the polyimide resistance heating film, and is used to monitor the temperature of the heating film.

9. The quick installation device for a piezoelectric sensor for pipeline detection according to claim 8, characterized in that: The model of the photoelectric coupler is TLP521, and the photoelectric coupler is used to control the on-off of the power supply circuit of the electromagnet and the resistance heating film.