Bionic flexible touch sensing monitoring system and method for hoisting large hydraulic turbine set

Abstract

The invention discloses a bionic flexible tactile sensing monitoring system and method for hoisting a large hydraulic turbine set, and the system comprises a plurality of bionic flexible tactile sensor online monitoring sensors. The online monitoring sensor comprises an air bag cushioning module, a bionic touch sensing unit, a central processing module, a Bluetooth transmission module, a flexible circuit board and an auxiliary circuit. A pressure sensing layer of the bionic touch sensing unit is inspired by a scorpion seam receptor to design bionic crack slotting, and a packaging layer is connected with an air bag cushioning module. The air bag cushioning module transmits external pressure signals to the bionic touch sensing unit, then transmits the external pressure signals to the central processing module, and finally transmits data to the upper computer through the Bluetooth transmission module. According to the device, the accuracy of micro gap detection can be improved, meanwhile, the labor cost can be reduced, the on-line monitoring function is achieved, the hoisting operation time can be shortened, the life safety of workers is guaranteed, and the safety of hoisting work is improved.

Description

Technical Field

[0001] The invention relates to the technical field of large-scale water turbine rotor hoisting, and in particular to a bionic flexible tactile sensing monitoring system and a monitoring method for the hoisting of a large-scale water turbine unit. Background Art

[0002] The rotor is an important part of the hydro-turbine generator set. In order to better ensure the operation of hydroelectric power generation, it needs to be hoisted out for inspection and troubleshooting every four to six years. Especially for large-scale hydro-turbine units, the interval between shutdowns and maintenance directly affects the working efficiency and economic benefits of the hydropower station. For large-scale hydro-turbine generator units, the large rotors are characterized by large mass and volume. The alignment of the rotors during the hoisting and installation process occupies more than 80% of the time of shutdown maintenance or troubleshooting. In addition, in the current process of hoisting and installing rotors in large hydro-power stations, the experience and operating skills of the hoisting and installation teams are mainly relied on, and simple and efficient digital systems are rarely used.

[0003] During the hoisting operation of large-scale hydro turbine units, collisions are prone to occur in the horizontal and inclined directions. The collision sites often occur on the outer wall of the rotor and the inner wall of the stator, the rotor shaft and the center hole of the thrust bearing. In order to ensure that the rotor of the hydro turbine unit does not collide with the stator during the installation process, the conventional practice is to mobilize a large number of installation workers, insert wooden boards around the rotor as feeler gauges for real-time observation, and use walkie-talkies to report to the on-site installation commander one by one, reporting that the wooden boards are inserted into the gap between the rotor and the stator. After the on-site installation commander makes a judgment, he will issue a rotor displacement instruction to the crane operator. This not only increases the time and labor cost of hoisting, but also greatly increases the hoisting risk caused by inaccurate measurement of the gap between large rotors and stators, and greatly increases the personal risk of operators. Therefore, during the hoisting and installation of large-scale hydro turbine units, real-time monitoring of the gap between the rotor and the stator is particularly important.

[0004] In addition, for the specific working scenario of hoisting and installation of large turbine units, considering that multiple measurements, usually about 10 to 20 in number, with small gaps usually within 30 mm and an accuracy of about 1 to 2 mm are required at the same time, as well as the installation scenario, how to improve the reliability and miniaturization of the entire test system while ensuring sufficient ranging sensor accuracy, and make it easy to be compatible with the current established turbine hoisting process, is the most critical problem in improving the working efficiency of power stations and improving the operational support capabilities of large turbine units.

[0005] Therefore, the existing technology still needs further improvement and development. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a bionic flexible tactile sensing monitoring system and a monitoring method for the hoisting of a large-scale water turbine unit. The present invention utilizes a bionic flexible tactile sensor to online monitor the airbag shock-absorbing module of the sensor to replace the manual pulling of the wood chip feeler gauge, thereby realizing real-time monitoring of the gap between the rotor 8 and the stator 9, thereby improving the hoisting and installation efficiency of large-scale water turbine rotors and reducing the personal safety risks of construction workers.

[0007] The technical solution of the present invention is as follows:

[0008] A bionic flexible tactile sensor monitoring system for the hoisting of a large-scale hydro-turbine unit, comprising: a plurality of bionic flexible tactile sensor online monitoring sensors, wherein the plurality of bionic flexible tactile sensor online monitoring sensors include:

[0009] An airbag cushioning module, a bionic tactile sensing unit in contact with the airbag cushioning module, a central processing module electrically connected to the bionic tactile sensing unit, and a Bluetooth transmission module connected to the central processing module, wherein the central processing module and the Bluetooth transmission module are respectively arranged on a flexible circuit board;

[0010] Wherein, the airbag shock-absorbing module is filled with inert gas and can be deformed when squeezed;

[0011] The bionic tactile sensing unit is provided with a bionic crack groove inspired by the scorpion suture receptor, and the bionic tactile sensing unit is used to generate a corresponding voltage signal according to the deformation of the airbag shock-absorbing module;

[0012] The airbag shock-absorbing module is deformed after being squeezed by external pressure, and the pressure of the deformation is transmitted to the bionic tactile sensing unit; the bionic tactile sensing unit transmits the pressure signal to the central processing module, and the central processing module transmits the signal to the host computer through the Bluetooth transmission module.

[0013] The bionic flexible tactile sensing monitoring system for the hoisting of a large-scale hydro-turbine unit, wherein the bionic tactile sensing unit comprises a packaging layer, a pressure sensing layer, an electrode layer and an isolation installation layer which are arranged in sequence;

[0014] Wherein, the encapsulation layer is the connection surface where the bionic tactile sensing unit contacts the airbag cushioning module; the encapsulation layer is connected to the airbag cushioning module via an insulating adhesive; the encapsulation layer is used to protect the pressure sensing layer;

[0015] The upper surface of the pressure sensing layer is connected to the packaging layer, and the lower surface is connected to the electrode layer; a bionic crack groove with a scorpion crack receptor is arranged on the upper surface of the pressure sensing layer;

[0016] The electrode layer is provided with cross-finger electrodes; the electrode layer is installed between the pressure sensing layer and the isolation installation layer;

[0017] The isolation mounting layer is connected to the lower surface of the electrode layer.

[0018] The bionic flexible tactile sensing monitoring system for the hoisting of a large hydro-turbine unit is characterized in that the bionic crack grooves are multiple parallel grooves arranged on the upper surface of the pressure sensing layer; and the encapsulation layer is used to protect the parallel grooves on the pressure sensing layer from being affected by the external environment.

[0019] The bionic flexible tactile sensing monitoring system for the hoisting of a large-scale hydro-turbine unit, wherein, further comprises: a charge amplification circuit electrically connected to the bionic tactile sensing unit;

[0020] Wherein, the charge amplification circuit includes an operational amplifier, a first resistor, a second resistor, and a first capacitor; the second pin of the operational amplifier is connected to the first voltage, the third pin of the operational amplifier is connected to the second power supply voltage through the first resistor, the fourth pin of the operational amplifier is grounded, the sixth pin of the operational amplifier is connected to one end of the first capacitor, the other end of the first capacitor is connected to the signal output end and is connected to the signal ground pin through the second resistor, and the seventh pin of the operational amplifier is connected to the second power supply voltage; the operational amplifier converts the current generated by the bionic tactile sensing unit into voltage, and transmits the voltage signal to the central processing module.

[0021] The bionic flexible tactile sensing monitoring system for the hoisting of a large-scale hydro-turbine unit, wherein the pressure sensing layer is made of flexible piezoelectric material;

[0022] The bionic tactile sensing unit utilizes the flexible piezoelectric material of the pressure sensing layer to simulate the process of biological neurons generating nerve impulse electrical signals, and arranges a flexible output electrode layer at the flexible piezoelectric material of the pressure sensing layer; the charge generated by the flexible piezoelectric material of the pressure sensing layer after being squeezed is input into the main control processing chip of the central processing module through the charge amplification circuit.

[0023] The bionic flexible tactile sensing monitoring system for the hoisting of a large hydro-turbine unit, wherein the isolation mounting layer is made of insulating material; the cross-finger electrodes are made of a metal material selected from the group consisting of silver, copper and gold; and the cross-finger electrodes are formed into flexible and bendable electrodes by vapor deposition on a polyimide film.

[0024] The bionic flexible tactile sensing monitoring system for the hoisting of a large-scale hydro-turbine unit, wherein the airbag shock-absorbing module is connected to the bionic tactile sensing unit via an insulating adhesive;

[0025] The flexible circuit board is a circuit board made of polyimide as a substrate.

[0026] In the bionic flexible tactile sensing monitoring system for hoisting a large hydro-turbine unit, the airbag shock-absorbing module adopts a prefabricated inflation mode; the thickness of the airbag shock-absorbing module after inflation is slightly smaller than the gap between the rotor and the stator.

[0027] The bionic flexible tactile sensing monitoring system for hoisting a large hydro-turbine unit is as follows: the length of the airbag shock-absorbing module is 40 mm, the width is 40 mm, and the height is 5 mm; the length of the bionic tactile sensing unit is 25 mm, the width is 40 mm, and the height is 5 mm; the length of the flexible circuit board is 30 mm, the width is 40 mm, and the height is 5 mm.

[0028] A gap monitoring method of a bionic flexible tactile sensing monitoring system for hoisting a large-scale hydro-turbine unit as described in any of the above items, wherein the plurality of bionic flexible tactile sensor online monitoring sensors are evenly arranged along the circumference at the gap between the rotor and the stator of the large-scale hydro-turbine generating unit, wherein the large-scale hydro-turbine generating unit comprises a rotor, a stator, a lower frame, a thrust oil tank and a machine drum;

[0029] The lower frame is fixed to the inner side of the engine, the thrust oil tank is fixed on the lower frame, and the center hole of the thrust oil tank and the lower frame are coaxial; the main shaft of the rotor passes through the center hole of the thrust oil tank and is connected to the center hole of the lower frame, and the stator is fixed on the engine through a bracket;

[0030] The gap monitoring method comprises:

[0031] Before the rotor hoisting operation, an airbag shock-absorbing module of a predetermined height is selected according to the designed spacing size between the rotor and the stator; the bionic flexible tactile sensor online monitoring sensor is evenly arranged along the circumference at the gap between the rotor and the stator, and fixed firmly;

[0032] During the hoisting operation, when the rotor enters the pit and produces non-centering hoisting operation, multiple bionic flexible tactile sensors fixed on the rotor surface are in contact and squeezed with the stator surface, and the airbag shock-absorbing module is deformed by external force, generating a pressure signal, which acts on the pressure sensing layer of the bionic sensor unit to generate a voltage signal;

[0033] The voltage signal generated by the flexible piezoelectric material of the pressure sensing layer is converted into a digital signal by the central processing module and then sent to the host computer through the Bluetooth transmission module. The relationship between the distance between the rotor and the stator and the corresponding voltage signal sensed and output by the pressure sensing layer is established, and the gap distance value between the rotor and the stator at the online monitoring sensor of each bionic flexible tactile sensor on the circumference is obtained after conversion.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The embodiment of the present invention provides a bionic flexible tactile sensing monitoring system and monitoring method for the hoisting of a large-scale hydro-turbine unit, wherein each flexible tactile sensor detects the gap between the rotor 8 and the stator 9 during the hoisting process, directly utilizing the extrusion deformation of the flexible airbag shock-absorbing module, replacing the traditional manual operation of pulling a wooden feeler gauge. While improving efficiency, it is also compatible with the current traditional hoisting construction steps, is easily accepted by construction workers, and reduces the training cost and acceptance difficulty of workers.

[0036] In addition, multiple bionic flexible tactile sensors 7 are used for online monitoring, which are evenly arranged along the circumference of the rotor 8. They can directly measure the gap distance between the rotor 8 and the stator 9. Through the corresponding fitting algorithm, the position of the rotor 8 shaft relative to the bearing seat can be directly calculated, and the semi-automatic position adjustment of the rotor 8 in the entire lifting process can be realized, which greatly improves the lifting operation efficiency and reduces the personal risk of construction workers.

[0037] The bionic tactile sensing unit of the present invention is designed with a bionic design, in which the key flexible piezoelectric material is grooved on its surface in imitation of the scorpion slit sensor, forming a surface multiple crack structure similar to the scorpion slit sensor. The advantage of this design is that when the flexible piezoelectric material is subjected to pressure, strain concentration occurs at each groove, causing the piezoelectric material to output charge.

[0038] Moreover, the present invention utilizes Bluetooth wireless transmission between each sensor, does not require complicated wiring, and can ensure the hoisting of a large turbine rotor 8 with a diameter of 50 to 100 m, further improving the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic cross-sectional structure diagram of a hydro-turbine generator set in which a bionic flexible tactile sensing monitoring system for hoisting a large hydro-turbine set according to an embodiment of the present invention is applied.

[0040] Figure 2 It is a schematic diagram of the explosion structure of the bionic tactile sensing unit of the bionic flexible tactile sensor online monitoring sensor according to an embodiment of the present invention.

[0041] Figure 3 Schematic diagram of the online monitoring sensor structure of a single bionic flexible tactile sensor according to an embodiment of the present invention.

[0042] Figure 4 This is a schematic diagram of a charge amplification circuit for an online monitoring sensor of a single bionic flexible tactile sensor according to an embodiment of the present invention.

[0043] Figure 5This is a schematic diagram of the installation of the bionic flexible tactile sensor online monitoring sensor according to an embodiment of the present invention installed on the generator rotor at an interval of 45°.

[0044] Figure 6 This is a schematic diagram of the measurement process of the bionic flexible tactile sensing monitoring system for hoisting a large water turbine unit of the present invention. DETAILED DESCRIPTION

[0045] The present invention provides a bionic flexible tactile sensing monitoring system for the hoisting of a large-scale water turbine unit. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0046] Those skilled in the art will appreciate that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, but does not exclude the presence or addition of one or more other features.

[0047] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as herein.

[0048] For this specific working scenario of hoisting and installation of large turbine units, considering the need for multiple measurements (usually 10-20 or so) with small gaps usually within 30mm and an accuracy of about 1-2mm, as well as the installation scenario, how to improve the reliability and miniaturization of the entire test system while ensuring sufficient ranging sensor accuracy, and make it easy to be compatible with the current established turbine hoisting process, is the most critical problem in improving the working efficiency of power stations and improving the operational support capabilities of large turbine units.

[0049] In order to solve the technical problems existing in the prior art, the present invention provides a bionic flexible tactile sensing monitoring system for the hoisting of a large-scale hydro turbine unit, including a plurality of bionic flexible tactile sensor online monitoring sensors, the plurality of bionic flexible tactile sensor online monitoring sensors are evenly arranged along the circumference at the gap between the rotor and the stator of the large-scale hydro turbine generating unit, and the bionic flexible tactile sensor includes: an airbag cushioning module 1, a bionic tactile sensing unit 2, a central processing module 3, a Bluetooth transmission module 4, a flexible circuit board (flexible PCB) 5, and an auxiliary circuit. Among them, the pressure sensing layer of the bionic tactile sensing unit 2 is inspired by the scorpion slit receptor to design a bionic crack groove, and the packaging layer is connected to the airbag cushioning module. The airbag cushioning module 1 transmits the external pressure signal to the bionic tactile sensing unit, and then to the central processing module 3, and finally transmits the data to the host computer through the Bluetooth transmission module 4. The present invention can improve the accuracy of small gap detection, and at the same time can reduce labor costs, realize the function of online monitoring, can shorten the hoisting operation time, and ensure the life safety of the staff, and improve the safety of the hoisting work.

[0050] Specifically, Figure 3 and Figure 6 As shown, a bionic flexible tactile sensing monitoring system for hoisting a large-scale hydro-turbine unit provided by an embodiment of the present invention comprises: a plurality of bionic flexible tactile sensors for online monitoring, wherein the plurality of bionic flexible tactile sensors for online monitoring comprise: an airbag cushioning module 1, a bionic tactile sensing unit 2, a central processing module 3, a Bluetooth transmission module 4, and a flexible PCB 5. After the airbag cushioning module 1 is squeezed by external pressure, the pressure is transmitted to the bionic tactile sensing unit 2. The bionic tactile sensing unit 2 transmits the pressure signal to the central processing module 3, and the central processing module 3 transmits the signal to the host computer 6 through the Bluetooth transmission module 4.

[0051] Among them, Figure 1 As shown, the bionic flexible tactile sensing monitoring system for the large-scale water turbine unit hoisting of this embodiment is installed Figure 1 and Figure 5 The large-scale hydro-turbine generating set shown in the figure includes a rotor 8, a stator 9, a lower frame 10, a thrust oil tank 11 and a shaft 12. The lower frame 10 is fixed to the inner side of the shaft 12, the thrust oil tank 11 is fixedly arranged on the lower frame 10, and the center hole of the thrust oil tank 11 and the lower frame 10 are in a coaxial position. The main shaft of the rotor 8 passes through the center hole of the thrust oil tank 11 and is connected to the center hole of the lower frame, and the stator 9 is fixed to the shaft 12 through a bracket.

[0052] like Figure 3As shown, in Example 1, a bionic flexible tactile sensor online monitoring sensor 7 for lifting large turbine units provided by the embodiment of the present invention includes an airbag shock-absorbing module 1, a bionic tactile sensing unit 2, a central processing module 3, a Bluetooth transmission module 4, a flexible PCB 5 and related auxiliary circuits.

[0053] The present invention is aimed at the working condition of hoisting large-scale turbine units. The traditional method requires a wooden feeler gauge to be manually inserted into the gap between the rotor 8 and the stator 9, and the gap between the rotor 8 and the stator 9 is judged by the difficulty of pulling and pulling repeatedly. On the one hand, such an operation requires a large number of construction workers, and each construction worker has a wooden feeler gauge to cover the circumference of the rotor 8. In addition, the biggest difficulty of the traditional use of wooden feeler gauges is that the gap is difficult to quantify, and it is impossible to directly give the numerical value of the gap between the rotor 8 and the stator 9. Only relying on operating experience to make judgments requires a high level of experience for the on-site operators, and also requires a high level of experience for the on-site hoisting commanders. At the same time, a large number of construction workers are close to the hoisted rotor 8, which also increases the construction risk.

[0054] The present invention proposes an online monitoring system based on bionic flexible tactile sensors, which comprises a plurality of bionic flexible tactile sensor online monitoring sensors 7, such as 6 to 8 flexible tactile sensors, which are evenly arranged along the circumference at the gap between the rotor 8 and the stator 9 during the hoisting operation. The airbag shock-absorbing module 1 is used to replace the traditional wood chip feeler gauge and is directly fixed to the circumferential surface of the generator rotor 8, such as Figure 5 As shown. According to the designed installation gap, select the airbag shock-absorbing module 1 with a suitable prefabricated height, such as 5mm, 10mm, 15mm and other sequence thicknesses. The thickness of the airbag shock-absorbing module 1 and the bionic tactile sensor unit 2 superimposed together is slightly larger than the gap between the rotor 8 and the stator 9. Since the airbag shock-absorbing module 1 is made of flexible material, it has a large deformation capacity, which can ensure that the airbag shock-absorbing module 1 is in a compressed state during the entire lifting and installation process. A pressure sensing material is set on the other side of the airbag shock-absorbing module 1 to convert the pressure signal of the airbag shock-absorbing module 1 into a voltage signal (electrical signal), so that the gap between the rotor 8 and the stator 9 can be converted into a digital signal in the form of an electrical signal through the central processing module 3, and sent to the host computer 6 through the Bluetooth transmission module 4.

[0055] In the present embodiment, Figure 5 As shown, an embodiment of the present invention provides a bionic flexible tactile sensor online monitoring sensor 7 for hoisting of a large water turbine unit, which is integrally installed between a rotor 8 and a stator 9 of a large water turbine unit.

[0056] Among them, Figure 2As shown, the bionic tactile sensing unit 2 includes a packaging layer 17, a pressure sensing layer 13, an electrode layer 14 and an isolation mounting layer 15 arranged in sequence. The packaging layer 17 is the connection surface where the bionic tactile sensing unit 2 contacts the airbag cushioning module 1; and the airbag cushioning module 1 can be connected by an insulating adhesive.

[0057] The upper surface of the pressure sensing layer 13 is connected to the encapsulation layer 17, and the lower surface is connected to the electrode layer 14. The pressure sensing layer 13 has a structure related to a scorpion slit sensor, which is made of PZT and PDMS materials, and is externally connected to cross-finger electrodes 18 to output the generated current signal;

[0058] Among them, PZT (lead zirconate titanate ceramic) and PDMS (polydimethylsiloxane) are two engineering materials.

[0059] PZT is a piezoelectric material with excellent piezoelectric properties. It can convert mechanical energy into electrical energy or vice versa. Therefore, PZT is widely used in piezoelectric sensors, piezoelectric transducers, piezoelectric motors and other fields. At the same time, PZT is also used to manufacture piezoelectric ceramics, piezoelectric ceramic transducers, acoustic wave amplifiers and other products.

[0060] PDMS is an elastomeric material with good softness and wear resistance. PDMS has excellent temperature resistance, chemical stability and biocompatibility, so it is widely used in microfluidics and biomedical engineering. PDMS is often used as a material for microfluidic chips, packaging materials for biosensors, matrix for cell culture, etc.

[0061] In the embodiment of the present invention, Figure 2 As shown, the electrode layer 14 is provided with cross-finger electrodes 18 , the material of the cross-finger electrodes 18 is copper, and the electrode layer 14 is installed between the pressure sensing layer 16 and the isolation installation layer 15 .

[0062] The isolation mounting layer 15 is connected to the lower surface of the electrode layer 14. The isolation mounting layer 15 is made of insulating material. When the bionic flexible tactile sensor online monitoring sensor 7 is installed in the gap between the rotor 8 and the stator 9, the isolation mounting layer 15 is in contact and connected with the stator 9 side of the large turbine unit.

[0063] In the embodiment of the present invention, Figure 2 As shown, a packaging layer 17 is provided on the upper surface of the bionic tactile sensing unit 2 of the bionic flexible tactile sensor online monitoring sensor 7, which is used to protect the parallel grooves 16 processed on the pressure sensing layer 13 from being affected by the external environment, and plays the role of electrical protection and mechanical protection. Figure 2 and Figure 3As shown, when the gap between the rotor 8 and the stator 9 of a large water turbine unit becomes smaller, the airbag shock-absorbing module 1 is subjected to greater compression, and the pressure is transmitted to the pressure sensing layer 13 with multiple parallel grooves 16 of the bionic tactile sensing unit 2. The pressure sensing layer 13 is made of flexible piezoelectric material. Based on the piezoelectric effect of the flexible piezoelectric material of the pressure sensing layer 13, the pressure signal is converted into a voltage signal (electric signal), and a charge signal is output through the contacting cross-finger electrodes 18.

[0064] In a further embodiment, according to the actual situation of the hoisting operation of a large-scale hydro turbine unit, optionally, the size of the bionic tactile sensor unit 2 is 25×40×5mm, the size of the airbag shock-absorbing module 1 is 40×40×5mm, and the size of the flexible PCB is designed to be 30×40×5mm; that is, the length of the airbag shock-absorbing module 1 is 40mm, the width is 40mm, and the height is 5mm; the length of the bionic tactile sensor unit 2 is 25mm, the width is 40mm, and the height is 5mm; the length of the flexible PCB5 is 30mm, the width is 40mm, and the height is 5mm. Such a size design is very convenient for installation; that is, it is convenient to install the bionic flexible tactile sensor online monitoring sensor 7 on the gap between the rotor 8 and the stator 9.

[0065] like Figure 3 As shown, the flexible PCB 5 in the embodiment of the present invention is integrated with a central processing module 3, a Bluetooth transmission module 4, a power circuit, and a signal conditioning circuit; the Bluetooth transmission module 4, the power circuit, and the signal conditioning circuit are respectively connected to the central processing module 3. Preferably, in the embodiment of the present invention, the power provided by the power circuit is 3.3V; the central processing module 3 has an internal analog-to-digital conversion function, and sends the signal data to the Bluetooth transmission module 4. Specifically, the data sent by the central processing module (3) is packaged and transmitted to the host computer 6 in real time through the Bluetooth transmission protocol.

[0066] Further, in the embodiment of the present invention, if Figure 2 As shown, the cross-finger electrodes 18 are made of low-resistance conductive materials, including but not limited to a metal material such as silver, copper, gold, etc., which are flexible and bendable electrodes formed by vapor deposition on a polyimide film.

[0067] Furthermore, if Figure 4 As shown, in the embodiment of the present invention, a charge amplifier circuit electrically connected to the pressure sensing layer 13 is also included. The charge amplifier circuit uses components such as an operational amplifier and a resistor. A possible design example is shown in the schematic diagram. Figure 4The charge amplifier circuit includes an operational amplifier U1, a first resistor R1, a second resistor R2, and a first capacitor C1; the second pin of the operational amplifier U1 is connected to the first voltage Vin, the third pin of the operational amplifier U1 is connected to the second power supply voltage VCC through the first resistor R1, the fourth pin of the operational amplifier U1 is grounded, the sixth pin of the operational amplifier U1 is connected to one end of the first capacitor C1, the other end of the first capacitor C2 is connected to the signal output terminal Vout and is connected to the signal ground pin SGND through the second resistor R2, and the seventh pin of the operational amplifier U1 is connected to the second power supply voltage VCC; the operational amplifier U1 is used to convert the current generated by the pressure sensing layer 13 into voltage and transmit the voltage signal to the central processing module 3.

[0068] In the embodiment of the present invention, the operational amplifier U1 preferably adopts an operational amplifier chip of model LMC6081. The operational amplifier chip of model LMC6081 adopted in the present invention is a high-performance operational amplifier chip, which has a single power supply function and low input bias current, and has the characteristics of high gain, high input impedance, low distortion and low power consumption, and can be used for applications such as signal amplification and filtering. In addition, LMC6081 also has an internal protection function, which can protect the chip from damage such as electrostatic discharge and overload. LMC6081 is an operational amplifier chip with excellent performance, stability and reliability.

[0069] In a further embodiment of the present invention, the central processing module 3 selects a main control chip with an internal analog-to-digital conversion function, which can collect voltage signals and implement analog-to-digital conversion internally, and transmit the processed signals to the host computer 6 via the Bluetooth transmission module 4.

[0070] In a further embodiment of the present invention, the Bluetooth transmission module 4 wirelessly transmits the data sent by the central processing module 3 to the host computer 6, and the online monitoring of the gap is achieved through fitting and calculation by the host computer program.

[0071] In the embodiment of the present invention, Figure 2 and Figure 3 As shown, the bionic tactile sensing unit 2 is designed based on the inspiration of the crack receptors on the body surface of the scorpion. On the tibia of the four pairs of walking legs of the scorpion, there are a series of crack receptors composed of cracks near the tarsal joints, which are used as the biological model of bionic design. The scorpion's ability to perceive tiny vibrations in the environment comes from the tiny vibration signals transmitted to the crack receptors at the tarsal joints through the walking legs, squeezing the "crack"-shaped biological receptors, causing strain concentration at each "crack", triggering nerve impulse signals, which is used as the bionic design mechanism.

[0072] According to the phenomenon that after the scorpion slit receptor is squeezed, the strain at the crack is concentrated, generating nerve impulses, the bionic tactile sensing unit 2 of the present invention is provided, wherein the flexible piezoelectric material of the pressure sensing layer 13 is used to simulate the process of the neurons in the organism generating nerve impulse electrical signals, and the flexible output electrode layer 14 is arranged at the flexible piezoelectric material of the pressure sensing layer 13. Then, the charge generated by the flexible piezoelectric material of the pressure sensing layer 13 after being squeezed is Figure 4 The charge amplifier circuit shown is input into the main control processing chip of the central processing module 3.

[0073] That is, further, if Figure 4 As shown, the charge amplifier circuit described in the embodiment of the present invention converts the current signal generated by the bionic tactile sensor unit 2 into a voltage signal as the output signal of the bionic tactile sensor unit 2 and inputs it into the main control processing chip of the central processing module 3.

[0074] In the embodiment of the present invention, preferably, the flexible piezoelectric material used in the pressure sensing layer 13 in the bionic tactile sensing unit 2 is prepared by uniformly mixing nano-particle PZT (lead zirconate titanate ceramic, i.e., piezoelectric ceramic transducer, PZT) powder into a liquid PDMS (polydimethylsiloxane, polydimethylsiloxane, PDMS) precursor solution, and curing to obtain a PZT@PDMS composite material. The advantage of using lead zirconate titanate ceramic (PZT) powder uniformly mixed into a polydimethylsiloxane (PDMS) matrix is ​​that it can ensure the realization of the piezoelectric effect while being flexible. Among them, a flexible output electrode is arranged at the flexible piezoelectric material, and its function is to output the charge generated by the pressure sensitivity.

[0075] In the embodiment of the present invention, preferably, after preparing the flexible piezoelectric material used in the pressure sensing layer 13, grooves are cut on the surface of the pressure sensing layer 13 in the manner of a scorpion slit sensor, such as Figure 2 The multiple parallel grooves 16 on the surface of the pressure sensing layer 13 form a surface multiple crack structure similar to a scorpion crack sensor. In the embodiment of the present invention, preferably, 10-12 elongated grooves can be processed according to actual conditions.

[0076] In the embodiment of the present invention, a packaging layer 17 is provided on the pressure sensing layer 13, a cross-finger electrode 18 is provided on the electrode layer 14 below the pressure sensing layer 13, and an isolation mounting layer 15 is provided below the electrode layer 14, thereby forming the bionic tactile sensing unit 2, and the current generated by the flexible piezoelectric material is converted into a voltage through a charge amplifier circuit, and then input into the main control processing chip of the central processing module.

[0077] Furthermore, if Figure 3As shown, an airbag damping module 1 needs to be arranged above the bionic tactile sensing unit 2, and its function is to measure the gap between the large-scale water turbine rotor 8 and the stator 9. The airbag damping module 1 is in contact with the upper surface of the bionic tactile sensing unit 2. When the gap between the large-scale water turbine rotor and the stator changes, the pressure generated by the squeezing of the two is transmitted to the bionic tactile sensing unit 2 by the airbag damping module 1.

[0078] Furthermore, in the embodiment of the present invention, the airbag shock-absorbing module 1 is filled with an inert gas, which can ensure the stability of the bionic tactile sensing unit 2. In a preferred embodiment, the airbag shock-absorbing module 1 can adopt a prefabricated inflation mode. That is, a certain thickness of the airbag after inflation is designed in advance (such as a sequence thickness of 5mm, 10mm, 15mm, etc.), and in the actual lifting process, an airbag of a specific thickness is selected to ensure that the thickness of the airbag is slightly smaller than the rotor-stator gap.

[0079] Further, in the embodiment of the present invention, if Figure 3 As shown, the central processing module 3 can be a main control processing chip with AD (analog to digital conversion, A / D) acquisition function, which and the Bluetooth transmission module 4 are integrated on the flexible PCB 5. Figure 6 As shown, the function of the central processing module 3 is to receive the voltage signal converted by the charge amplifier circuit of the bionic tactile sensor unit 2, convert the analog voltage signal into a digital signal through the AD inside the main control processing chip of the central processing module 3, and after calculating and processing the digital signal, send it to the host computer 6 through the Bluetooth transmission module 4.

[0080] Further, in the embodiment of the present invention, if Figure 3 As shown, the flexible PCB5 is preferably a circuit board made of polyimide as a substrate, and has the characteristics of high wiring density, light weight, and thin thickness. It is a flexible integrated carrier integrating a central processing module, a Bluetooth transmission module, and related auxiliary circuits.

[0081] Further, in the embodiment of the present invention, if Figure 3 As shown, the Bluetooth transmission module 4 utilizes the Bluetooth communication protocol to transmit the voltage signal processed by the central processing module 3 to the host computer 6, thereby realizing the function of monitoring the gap between the rotor and the stator of a large-scale water turbine unit.

[0082] The embodiment of the present invention, as Figure 1 and Figure 5As shown, before the rotor 8 is hoisted, the airbag shock-absorbing module 1 of suitable height is selected according to the design spacing size between the rotor 8 and the stator 9, and the above-mentioned bionic flexible tactile sensor online monitoring sensor 7 is evenly installed on the outer surface of the rotor 8 at an interval of 45° and fixed firmly. During the hoisting operation, especially when the rotor 8 enters the pit to produce non-centering hoisting operation, the multiple bionic flexible tactile sensor online monitoring sensors 7 fixed on the surface of the rotor 8 contact and squeeze the surface of the stator 9, and the airbag shock-absorbing module on its surface is deformed, and the pressure generated acts on the pressure sensing layer 13. The voltage signal (electrical signal) generated by the flexible piezoelectric material of the pressure sensing layer 13 is converted into a digital signal by the central processing module 3 and sent to the host computer 6 through the Bluetooth transmission module 4. Here, the relationship between the distance between the rotor and the stator and the corresponding voltage signal of the pressure sensing layer sensing output is established, and the gap distance values ​​of the rotor and the stator at each bionic flexible tactile sensor online monitoring sensor 7 on the circumference are obtained by conversion, so as to be directly displayed on the host computer software screen in a graphical manner. The crane operator uses this as a basis to adjust the relative position of the rotor and stator, realizing semi-automatic lifting of large rotors.

[0083] In summary, the bionic flexible tactile sensor online monitoring system proposed in the present invention, in which each bionic flexible tactile sensor online monitoring sensor 7 detects the gap during the rotor stator hoisting process, directly utilizes the extrusion deformation of the airbag shock-absorbing module 1, replacing the traditional manual pulling of the wooden feeler gauge operation. While improving efficiency, it is also compatible with the current traditional hoisting construction steps, which is easy to be accepted by construction workers, reducing the training cost and acceptance difficulty of workers.

[0084] In addition, the present invention adopts multiple bionic flexible tactile sensors 7 for online monitoring, which are evenly arranged along the circumference of the rotor. The gap distance between the rotor and the stator can be directly measured. Through the corresponding fitting algorithm, the position of the rotor shaft relative to the bearing seat can be directly calculated, and the semi-automatic adjustment of the rotor position during the entire lifting process can be realized, which greatly improves the lifting operation efficiency and reduces the personal risk of construction workers.

[0085] The bionic tactile sensing unit 2 of the present invention adopts a bionic design, in which the flexible piezoelectric material of the key pressure sensing layer 13 is grooved on its surface in imitation of the scorpion slit receptor, forming a surface multiple crack structure similar to the scorpion slit receptor. The advantage of this design is that when the pressure sensing layer 13 is subjected to pressure, strain concentration occurs at each groove, causing the piezoelectric material to output charge.

[0086] In the embodiment of the present invention, each of the multiple bionic flexible tactile sensors uses Bluetooth wireless transmission between online monitoring sensors 7, which does not require complicated wiring and can ensure the hoisting of large turbine rotors with a diameter of 50 to 100 meters, further improving construction efficiency.

[0087] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A bionic flexible tactile sensing monitoring system for the hoisting of a large-scale water turbine unit, characterized in that: include: A plurality of bionic flexible tactile sensors are used to monitor online sensors, wherein the plurality of bionic flexible tactile sensors are used to monitor online sensors, including: An airbag cushioning module, a bionic tactile sensing unit in contact with the airbag cushioning module, a central processing module electrically connected to the bionic tactile sensing unit, and a Bluetooth transmission module connected to the central processing module, wherein the central processing module and the Bluetooth transmission module are respectively arranged on a flexible circuit board; The airbag shock-absorbing module is filled with an inert gas and can be deformed when squeezed; The bionic tactile sensing unit is provided with a bionic crack groove inspired by the scorpion suture receptor, and the bionic tactile sensing unit is used to generate a corresponding voltage signal according to the deformation of the airbag cushioning module; The airbag shock-absorbing module is deformed after being squeezed by external pressure, and the pressure of the deformation is transmitted to the bionic tactile sensing unit; the bionic tactile sensing unit transmits the pressure signal to the central processing module, and the central processing module transmits the signal to the host computer through the Bluetooth transmission module.

2. The bionic flexible tactile sensing monitoring system for large-scale water turbine installation according to claim 1 is characterized in that: The bionic tactile sensing unit comprises a packaging layer, a pressure sensing layer, an electrode layer and an isolation installation layer which are arranged in sequence; Wherein, the encapsulation layer is the connection surface where the bionic tactile sensing unit contacts the airbag cushioning module; the encapsulation layer is connected to the airbag cushioning module via an insulating adhesive; the encapsulation layer is used to protect the pressure sensing layer; The upper surface of the pressure sensing layer is connected to the packaging layer, and the lower surface is connected to the electrode layer; a bionic crack groove with a scorpion crack receptor is arranged on the upper surface of the pressure sensing layer; The electrode layer is provided with cross-finger electrodes; the electrode layer is installed between the pressure sensing layer and the isolation installation layer; The isolation mounting layer is connected to the lower surface of the electrode layer.

3. The bionic flexible tactile sensing monitoring system for large-scale water turbine installation according to claim 2 is characterized in that: The bionic crack grooves are multiple parallel grooves arranged on the upper surface of the pressure sensing layer; the encapsulation layer is used to protect the parallel grooves on the pressure sensing layer from being affected by the external environment.

4. The bionic flexible tactile sensing monitoring system for large-scale water turbine installation according to claim 2 is characterized in that: It also includes: a charge amplification circuit electrically connected to the bionic tactile sensing unit; Wherein, the charge amplification circuit includes an operational amplifier, a first resistor, a second resistor, and a first capacitor; the second pin of the operational amplifier is connected to the first voltage, the third pin of the operational amplifier is connected to the second power supply voltage through the first resistor, the fourth pin of the operational amplifier is grounded, the sixth pin of the operational amplifier is connected to one end of the first capacitor, the other end of the first capacitor is connected to the signal output end and is connected to the signal ground pin through the second resistor, and the seventh pin of the operational amplifier is connected to the second power supply voltage; the operational amplifier converts the current generated by the bionic tactile sensing unit into voltage, and transmits the voltage signal to the central processing module.

5. The bionic flexible tactile sensing monitoring system for large-scale water turbine installation according to claim 4 is characterized in that: The pressure sensing layer is made of flexible piezoelectric material; The bionic tactile sensing unit utilizes the flexible piezoelectric material of the pressure sensing layer to simulate the process of biological neurons generating nerve impulse electrical signals, and arranges a flexible output electrode layer at the flexible piezoelectric material of the pressure sensing layer; the charge generated by the flexible piezoelectric material of the pressure sensing layer after being squeezed is input into the main control processing chip of the central processing module through the charge amplification circuit.

6. The bionic flexible tactile sensing monitoring system for large-scale water turbine installation according to claim 2 is characterized in that: The isolation installation layer is made of insulating material; the cross-finger electrodes are made of a metal material selected from silver, copper and gold; and the cross-finger electrodes are formed into flexible and bendable electrodes by evaporation on a polyimide film.

7. The bionic flexible tactile sensing monitoring system for large-scale water turbine installation according to claim 1 is characterized in that: The airbag shock absorbing module is connected to the bionic tactile sensing unit via an insulating adhesive; The flexible circuit board is a circuit board made of polyimide as a substrate.

8. The bionic flexible tactile sensing monitoring system for large-scale water turbine installation according to claim 1 is characterized in that: The airbag shock-absorbing module adopts a prefabricated inflation mode; the thickness of the airbag shock-absorbing module after inflation is slightly smaller than the gap between the rotor and the stator.

9. The bionic flexible tactile sensing monitoring system for large-scale water turbine installation according to claim 1 is characterized in that: The airbag shock-absorbing module has a length of 40 mm, a width of 40 mm, and a height of 5 mm; the bionic tactile sensing unit has a length of 25 mm, a width of 40 mm, and a height of 5 mm; and the flexible circuit board has a length of 30 mm, a width of 40 mm, and a height of 5 mm.

10. A gap monitoring method for a bionic flexible tactile sensing monitoring system for hoisting a large-scale hydro-turbine unit according to any one of claims 1 to 9, characterized in that: The multiple bionic flexible tactile sensor online monitoring sensors are evenly arranged along the circumference at the gap between the rotor and the stator of the large-scale water turbine power generation unit, wherein the large-scale water turbine power generation unit includes a rotor, a stator, a lower frame, a thrust oil tank and a machine drum; The lower frame is fixed to the inner side of the engine, the thrust oil tank is fixed on the lower frame, and the center hole of the thrust oil tank and the lower frame are coaxial; the main shaft of the rotor passes through the center hole of the thrust oil tank and is connected to the center hole of the lower frame, and the stator is fixed on the engine through a bracket; The gap monitoring method comprises: Before the rotor hoisting operation, an airbag shock-absorbing module of a predetermined height is selected according to the designed spacing size between the rotor and the stator; the bionic flexible tactile sensor online monitoring sensor is evenly arranged along the circumference at the gap between the rotor and the stator, and fixed firmly; During the hoisting operation, when the rotor enters the pit and produces non-centering hoisting operation, multiple bionic flexible tactile sensors fixed on the rotor surface are in contact and squeezed with the stator surface, and the airbag shock-absorbing module is deformed by external force, generating a pressure signal, which acts on the pressure sensing layer of the bionic sensor unit to generate a voltage signal; The voltage signal generated by the flexible piezoelectric material of the pressure sensing layer is converted into a digital signal by the central processing module and then sent to the host computer through the Bluetooth transmission module. The relationship between the distance between the rotor and the stator and the corresponding voltage signal sensed and output by the pressure sensing layer is established, and the gap distance value between the rotor and the stator at the online monitoring sensor of each bionic flexible tactile sensor on the circumference is obtained after conversion.

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