Abnormity monitoring device and monitoring method for composite material spray pipe

Abstract

The invention relates to the technical field of rocket engines, in particular to an abnormity monitoring device and monitoring method for a composite spraying pipe. The abnormity monitoring device of the composite material spray pipe comprises a thermocouple wire which is used for feeding back a heat parameter of a to-be-detected spray pipe in a curing process; the at least two strain sensors are used for feeding back coupling data of heat and strain force of the to-be-tested spray pipe; the data processing assembly is connected with the thermocouple wire and the strain sensor, and the data processing assembly can collect the heat parameters of the thermocouple wire and the coupling data of the strain sensor and output the curing stress anomaly detection result of the to-be-detected spray pipe according to the temperature parameters and the coupling data. By arranging the thermocouple wire and the strain sensor which can be pre-embedded in the to-be-detected spray pipe, heat data and coupling data in the curing process of the to-be-detected spray pipe are fed back, the detection efficiency is high, the data processing module directly outputs a curing stress anomaly detection result after the spray pipe is manufactured, and the production efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of rocket engines, and particularly relates to an abnormal monitoring device and a monitoring method for a composite nozzle. Background Art

[0002] In recent years, with the increasing demand for commercial satellite launch missions in China, low-cost launch vehicles have become the mainstream development trend. Composite nozzles, which have the characteristic of high specific strength, have been widely used in the industry.

[0003] The composite nozzle is one of the core components of a solid rocket engine. It is usually composed of a structural layer (shell load-bearing layer) and a functional layer (throat liner, ablation-resistant layer, heat-insulating layer) and is manufactured by an integral curing molding method. During the manufacturing process of the nozzle, complex temperature gradients will occur inside the epoxy-based composite material used in the structural layer and the phenolic-based composite material used in the functional layer, resulting in large thermal stresses and deformations in the structure. Moreover, the thermal expansion coefficients of the epoxy-based composite material and the phenolic-based composite material are different, and the viscoelasticity and elastic modulus of different polymer matrices are also different. There are problems of uneven thermal stress during the manufacturing process, which cause wrinkling phenomena, or cause stress concentration at the interface to be measured during service, and even lead to the rupture of the nozzle structure in severe cases. Sampling inspection is the current mainstream nozzle quality control method in China, but this method first has the risk of missed inspection, and secondly, sampling inspection can only carry out inspection work after the nozzle manufacturing is completed, which affects production efficiency. How to ensure the quality reliability of a large number of nozzles and promptly detect abnormal curing stress problems of the nozzles has become a difficult problem that practitioners urgently need to solve. Summary of the Invention

[0004] In the related technology, for the curing quality detection of composite nozzles, inspection work can only be carried out after the nozzle curing process is completed, resulting in low production efficiency and difficulty in promptly detecting abnormal curing stress problems of the nozzles.

[0005] In a first aspect, an embodiment of the present application provides an abnormal monitoring device for a composite nozzle, which includes: a thermocouple wire, at least two strain sensors, and a data processing component; wherein,

[0006] The thermocouple wire is used to feedback the heat parameters during the curing process of the nozzle to be measured;

[0007] At least two strain sensors are used to feedback the coupled data of the heat and strain force of the nozzle to be measured;

[0008] The data processing component is connected to the thermocouple wire and the strain sensors. The data processing component can collect the heat parameters of the thermocouple wire and the coupled data of the strain sensors, and output the abnormal detection result of the curing stress of the nozzle to be measured according to the temperature parameters and the coupled data.

[0009] In combination with the first aspect, in one embodiment, the strain sensor includes: a sensing optical fiber for being pasted on the interface to be measured between the layers of the nozzle to be measured.

[0010] In combination with the first aspect, in one embodiment, a protective tube is sleeved on a partial area of the sensing optical fiber.

[0011] In combination with the first aspect, in one embodiment, the data processing component includes:

[0012] A lead sealing device connected to the thermocouple wire and the strain sensor;

[0013] A data processing unit signal-connected to the lead sealing device.

[0014] In combination with the first aspect, in one embodiment, the lead sealing device includes:

[0015] A sleeve filled with a sealing resin therein;

[0016] A bare optical fiber passing through the sleeve, one end of the bare optical fiber is connected to the data processing unit, and the other end is connected to the sensing optical fiber;

[0017] A wire passing through the sleeve, one end of the wire is connected to the data processing unit, and the other end is connected to the thermocouple wire.

[0018] In combination with the first aspect, in one embodiment, the data processing unit includes:

[0019] An optical fiber grating demodulator connected to the bare optical fiber, and the optical fiber grating demodulator is used for collecting the coupling data of the strain sensor;

[0020] A thermometer connected to the wire, and the thermometer is used for collecting the heat data of the thermocouple wire;

[0021] A processor signal-connected to the optical fiber grating demodulator and the thermometer, and the processor is used for outputting an abnormal detection result of the curing stress of the nozzle to be measured according to the temperature parameter and the coupling data.

[0022] In a second aspect, an embodiment of the present application provides a monitoring method for an abnormal monitoring device using the above composite material nozzle, which includes:

[0023] Pre-burying a thermocouple wire and a strain sensor in the nozzle to be measured;

[0024] Curing the nozzle to be measured, and using the data processing component to collect the coupling data and heat data of the thermocouple wire and the strain sensor;

[0025] Determine whether there is an abnormal curing stress in the nozzle to be measured according to the reference data set and the curing data set.

[0026] Combined with the second aspect, in one embodiment, embedding thermocouple wires and strain sensors in the nozzle to be measured includes:

[0027] Lay thermocouple wires and two sensing optical fibers at the interface to be measured of the nozzle to be measured, and arrange the two sensing optical fibers symmetrically with the thermocouple wire as the center.

[0028] Combined with the second aspect, in one embodiment, using the data processing component to collect the coupling data and heat data of the thermocouple wire and the strain sensor includes:

[0029] Use the data processing component to collect the coupling data and heat data of the thermocouple wire and the strain sensor in the initial state as the reference data set;

[0030] Collect the coupling data and heat data of the thermocouple wire and the strain sensor during the curing process of the nozzle to be measured through the data processing component as the curing data set.

[0031] Combined with the second aspect, in one embodiment, determining whether there is an abnormal curing stress in the nozzle to be measured according to the reference data set and the curing data set includes:

[0032] Calculate the difference coefficient index according to the reference data set and the curing data set, and determine whether there is an abnormal curing stress in the nozzle to be measured according to the difference coefficient index.

[0033] The beneficial effects brought by the technical solution provided by the embodiments of the present application at least include:

[0034] In the present application, by setting thermocouple wires and strain sensors that can be embedded inside the nozzle to be measured to feedback the heat data and coupling data during the curing process of the nozzle to be measured, and then transmitting the two groups of data to the data processing component for analysis and automatic interpretation, the detection efficiency is high. After the nozzle is manufactured, the data processing module directly outputs the detection result of abnormal curing stress, which greatly improves the production efficiency. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings.

[0036] Figure 1 Schematic diagram of the device for monitoring abnormal curing stress in the embodiments of the present application;

[0037] Figure 2 It is a partial structural schematic diagram of the curing stress abnormal monitoring device in the embodiment of the present application;

[0038] Figure 3 It is a schematic diagram of the lead sealing device in the embodiment of the present application.

[0039] In the figure: 1. Thermocouple wire; 2. Nozzle to be measured; 21. Interface to be measured; 3. Protection tube; 4. Lead sealing device; 41. Sleeve; 42. Bare optical fiber; 43. Conducting wire; 44. Terminal; 45. Threaded joint; 46. Sealing resin; 5. Sensing optical fiber; 6. Fiber Bragg grating demodulator; 7. Temperature measuring instrument; 8. Processor; 9. Curing equipment. Specific embodiments

[0040] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0041] In related technologies, for the curing quality detection of composite nozzles, the detection work can only be carried out after the nozzle curing process is completed, resulting in low production efficiency and difficulty in timely detecting abnormal nozzle curing stress problems.

[0042] In the first aspect, as Figure 1 shown, the present application provides an abnormal monitoring device for a composite nozzle, which includes:

[0043] A thermocouple wire 1, which is used to feedback the heat parameters during the curing process of the nozzle 2 to be measured; at least two strain sensors, which are used to feedback the coupling data of heat and strain force of the nozzle 2 to be measured;

[0044] A data processing component, which is connected to the thermocouple wire 1 and the strain sensors. The data processing component can collect the heat parameters of the thermocouple wire 1 and the coupling data of the strain sensors, and output the curing stress abnormal detection result of the nozzle 2 to be measured according to the temperature parameters and the coupling data.

[0045] Optionally, the probe diameter of the thermocouple wire 1 should be less than 1 mm. The lead of the thermocouple wire 1 is encapsulated with a Teflon sleeve to prevent the lead from melting and causing a short circuit in a high-temperature environment. The maximum operating temperature of the terminal 44 is not lower than 200 °C.

[0046] It should be noted that during the manufacturing process of traditional composite nozzles, there are problems of undetectable thermal stress and uncontrollable quality inside the nozzle. Traditional stress detection methods, such as resistance strain gauges, ultrasonic detection, finite element simulation, etc., all have limitations. For example, the resistance strain gauge cannot be closely pasted to the nozzle material and has low detection accuracy; the detection accuracy of ultrasonic detection depends on the ultrasonic propagation characteristics of the nozzle material; finite element simulation depends on the accuracy of the model and input parameters and cannot accurately detect. In this application, the thermocouple wire 1 and the strain sensor can be used to implant inside the material for testing, and then the internal parameter changes during the nozzle curing process can be transmitted to the data processing component for rapid analysis and judgment. At the same time, there is no need to detect after the product is formed, which greatly improves the detection efficiency.

[0047] Combined with the above embodiments, in some preferred embodiments, the strain sensor includes: a sensing optical fiber 5, which is used to be pasted on the interface 21 to be measured between the two layers of the nozzle 2 to be measured. Optionally, the sensing optical fiber 5 is a single-mode quartz optical fiber, the diameter of the single-mode quartz optical fiber is 0.25 mm, the coating layer is a polyimide coating, and one or more fiber gratings are distributed on the single-mode quartz optical fiber, and the fiber gratings are prepared by femtosecond laser.

[0048] It should be noted that the sensing optical fiber 5 has a wider temperature adaptability, higher viability, and better test stability compared with conventional sensors or thin film sensors. And the sensing optical fiber 5 has less influence on the internal quality of the product during molding.

[0049] In some alternative embodiments, as Figure 2 shown, a protective tube 3 is sleeved on a partial area of the sensing optical fiber 5. Preferably, protective tubes 3 are provided at both ends of the sensing optical fiber 5, and the protective tubes 3 can be capillary stainless steel tubes. The inner diameter of the capillary stainless steel tube should be larger than the diameter of the sensing optical fiber, the wall thickness is 0.1 mm, and the capillary stainless steel tube needs to be removed after the sensing optical fiber 5 line is fixed during use to ensure full contact between the sensing optical fiber and the interface to be measured of the nozzle to be measured.

[0050] It can be understood that the protective tube 3 can be used to isolate the stress interference during the nozzle winding process.

[0051] In some specific embodiments, the data processing component includes: a lead sealing device 4 and a data processing unit; wherein,

[0052] The lead sealing device 4 is connected to the thermocouple wire 1 and the strain sensor. The data processing unit is signal-connected to the lead sealing device 4.

[0053] Preferably, as Figure 3 shown, the lead sealing device 4 includes: a sleeve 41, a bare optical fiber 42 and a wire 43; wherein,

[0054] A sleeve 41 filled with a sealing resin therein; a bare optical fiber 42 passing through the sleeve 41, one end of the bare optical fiber 42 being connected to the data processing unit and the other end being connected to the sensing optical fiber 5; a wire 43 passing through the sleeve 41, one end of the thermocouple wire 1 being connected to the data processing unit and the other end being connected to the thermocouple wire 1.

[0055] It should be noted that the size of the lead sealing device 4 should match the inner wall of the vent hole of the nozzle curing equipment and be installed inside the curing equipment, and the length should not be less than 50 mm to ensure the airtightness of the lead sealing device.

[0056] Further, the lead sealing device 4 further includes: a terminal block 44 and a threaded joint 45. The sleeve 41 is embedded in the threaded joint 45. The bare optical fiber 42 and the wire 43 pass through the sleeve 41 and each leave a line of more than 1 m at both ends of the threaded joint 45 for convenient connection with the equipment.

[0057] It is worth noting that during preparation, the bare optical fiber 42 and the wire 43 pass through the sleeve 41, and then the sealing resin 46 is injected into the threaded joint 45, and after waiting for the sealing resin 46 to cure, the fixation is completed.

[0058] In some alternative embodiments, the data processing unit includes: an optical fiber grating demodulator 6, a temperature measuring instrument 7, and a processor 8; wherein,

[0059] The optical fiber grating demodulator 6 is connected to the bare optical fiber 42, and the optical fiber grating demodulator 6 is used to collect the coupling data of the strain sensor; the temperature measuring instrument 7 is connected to the wire 43, and the temperature measuring instrument 7 is used to collect the heat data of the thermocouple wire 1; the processor 8 is signal-connected to the optical fiber grating demodulator 6 and the temperature measuring instrument 7, and the processor 8 is used to output the curing stress anomaly detection result of the to-be-tested nozzle 2 according to the temperature parameter and the coupling data.

[0060] It is worth noting that the optical fiber grating demodulator 6 is used to collect the test data of the sensing optical fiber 5 during the manufacturing process of the nozzle, the temperature measuring instrument 7 is used to collect the test data of the thermocouple wire 1 during the curing process of the to-be-tested nozzle 2, the processor 8 is connected to the optical fiber grating demodulator 6 and the temperature measuring instrument 7, and is used to collect all the test data, decouple the strain data of the to-be-tested interface 21 of the to-be-tested nozzle 2 and analyze the data characteristics, and output the curing stress anomaly detection result of the to-be-tested nozzle 2. The temperature measuring instrument 7 should be compatible with the type of the thermocouple wire 1 and have a multi-channel data storage function.

[0061] In a second aspect, the present application provides a monitoring method for a composite nozzle using the above-mentioned anomaly monitoring device, which includes:

[0062] Step S1, pre-embed the thermocouple wire 1 and the strain sensor in the to-be-tested nozzle 2.

[0063] A preferred implementation of the above step S1 includes:

[0064] Step S1a: Arrange a thermocouple wire 1 and two sensing optical fibers 5 at the interface 21 to be tested of the nozzle 2 to be tested, and arrange the two sensing optical fibers 5 symmetrically around the thermocouple wire 1 as the center.

[0065] Specifically, two sensing optical fibers 5 are symmetrically arranged along the busbar direction at the interface 21 to be measured of the nozzle 2 to be measured. The thermocouple wire 1 is located at the center of the two symmetrical sensing optical fibers 5. The three together form a measurement area. Further, the thermocouple wire 1 and the sensing optical fiber 5 are continuously adhered to the interface 21 to be measured of the nozzle 2 to be measured using a quick-drying adhesive.

[0066] Step S1b, connecting the thermocouple wire 1 and the sensing optical fiber 5 to the data processing component.

[0067] Specifically, one side of the sensing optical fiber 5 is connected to the lead-in sealing device 4 along the outlet direction of the interface 21 to be tested of the nozzle 2 to be tested, and is fused with the lead-in sealing device 4 using an optical fiber fusion splicer, and the other side is naturally led out to the inlet direction of the interface 21 to be tested of the nozzle 2 to be tested. Further, it is respectively connected to the fiber grating demodulator 6 and the temperature meter 7 through the lead-in sealing device 4. The lead-in line of the thermocouple wire 1 is connected to the lead-in sealing device 4 along the outlet direction of the interface 21 to be tested of the nozzle 2 to be tested, and is connected to the lead-in sealing device 4 using a wiring terminal 44.

[0068] Step S2, curing the nozzle 2 to be tested, and using a data processing component to collect coupling data and thermal data of the thermocouple wire 1 and the strain sensor.

[0069] The above step S2 specifically includes:

[0070] Step S2a, using a data processing component to collect coupling data and thermal data of the thermocouple wire 1 and the strain sensor in an initial state as a reference data set;

[0071] Specifically, a communication connection is established with the fiber grating demodulator 6 and the temperature meter 7. Before the nozzle 2 to be tested starts to solidify, the fiber grating demodulator 6 and the temperature meter 7 are used to measure the reference data C of the sensing fiber. i (0)=[C ip (0),C iq (0)] and thermocouple wire reference data T i (0). Where i represents the i-th test area of ​​the test interface of the test nozzle, p and q represent two symmetrical positions of the test interface of the test nozzle, C ip (0),C iq(0) represents the reference data of the sensing optical fiber at two symmetrical positions of the interface 21 of the nozzle 2 to be tested.

[0072] Step S2b: collecting coupling data and heat data of the thermocouple wire 1 and the strain sensor during the curing process of the nozzle 2 to be tested as a curing data group through a data processing component.

[0073] Specifically, the whole curing process of the nozzle to be tested is continuously recorded to obtain the test data C of the sensing optical fiber 5 in the i-th test area. i (t) = [C ip (t),C iq (t)], obtain the test data T of the thermocouple wire 1 in the i-th measurement area i (t).

[0074] Step S3: judging whether the nozzle 2 to be tested has abnormal curing stress according to the reference data group and the curing data group.

[0075] The above step S3 specifically includes:

[0076] Step S3a, obtaining strain test data at two symmetrical positions of the test interface 21 of the test nozzle 2.

[0077] Specifically, according to the strain and temperature decoupling equation ε = ΔC - α n ·ΔT·λ B , obtain the strain test data ε of the i-th test area of ​​the test interface of the test nozzle i (t) = [ε ip (t),ε iq (t)], where α n is the optical fiber thermo-optic coefficient, λ B is the center wavelength of the fiber Bragg grating reflected light, ε ip (t),ε iq (t) is the strain test data of two symmetrical positions of the test interface 21 of the test nozzle 2.

[0078] Step S3b, calculating a difference coefficient index according to the reference data set and the solidification data set, and judging whether the solidification stress abnormality occurs in the nozzle 2 to be tested according to the difference coefficient index.

[0079] Specifically, the difference coefficient r of the strain test data of two sensing optical fibers with symmetry on the nozzle interface to be tested is set according to the formula:

[0080]

[0081] in is the mean value of the strain test data at two symmetrical positions on the nozzle interface to be tested, and the coefficient of difference r of the optical fiber strain test data in each measuring area is calculated. i, a difference coefficient matrix R = [r1, r2, …, r n is formed. A threshold value a is set. When there is an element |r i | < a in the difference coefficient matrix R, it is determined that the curing stress of the nozzle to be measured is abnormal at the interface. At this time, the data processing module outputs the result as "abnormal", otherwise it outputs "qualified".

[0082] In summary, the device proposed by the present invention adopts fiber optic sensing technology. By embedding sensing optical fibers during the manufacturing process of the composite nozzle, it has the advantages of small size and anti-electromagnetic interference, and can realize non-destructive detection of the strain data inside the nozzle. Further, the sensing optical fibers are arranged during the winding process of the composite nozzle, and the leads are led out along the inlet and outlet directions of the nozzle, without affecting the normal manufacturing process of the nozzle. It can realize on-line monitoring of the entire process of nozzle manufacturing, real-time collection of the temperature and strain data inside the nozzle, and provide data support for the design optimization of the nozzle. In addition, the curing stress abnormality monitoring device of the present application can automatically interpret, with high detection efficiency. After the nozzle manufacturing is completed, the data processing module directly outputs the curing stress abnormality detection result, greatly improving the production efficiency.

[0083] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0084] It should be noted that in the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "including", "comprising" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0085] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An abnormality monitoring device for a composite nozzle, characterized in that: include: A thermocouple wire (1) for feeding back thermal parameters of a curing process of a nozzle (2) to be tested; At least two strain sensors, which are used to feed back coupling data of heat and strain force of the nozzle (2) to be tested; A data processing component is connected to the thermocouple wire (1) and the strain sensor, and the data processing component can collect the thermal parameters of the thermocouple wire (1) and the coupling data of the strain sensor, and output the curing stress anomaly detection result of the nozzle (2) to be tested according to the temperature parameters and the coupling data.

2. The abnormality monitoring device according to claim 1, characterized in that: The strain sensor comprises: a sensing optical fiber (5) which is used to be adhered to an interface (21) to be measured between layers of the nozzle (2) to be measured.

3. The abnormality monitoring device according to claim 2, characterized in that: A protective tube (3) is provided on the upper part of the sensing optical fiber (5).

4. The abnormality monitoring device according to claim 2, characterized in that: The data processing component includes: A lead sealing device (4) connected to the thermocouple wire (1) and the strain sensor; A data processing unit is connected to the lead sealing device (4) by signal.

5. The abnormality monitoring device according to claim 4, characterized in that: The lead sealing device (4) comprises: a sleeve (41) filled with a sealing resin; a bare optical fiber (42) which is inserted into the casing (41), one end of the bare optical fiber (42) being connected to the data processing unit, and the other end of the bare optical fiber (42) being connected to the sensing optical fiber (5); A wire (43) is inserted into the sleeve (41); one end of the wire (43) is connected to the data processing unit, and the other end is connected to the thermocouple wire (1).

6. The abnormality monitoring device according to claim 5, characterized in that: The data processing unit comprises: A fiber Bragg grating demodulator (6) connected to the bare optical fiber (42), the fiber Bragg grating demodulator (6) being used to collect coupling data of the strain sensor; A thermometer (7), which is connected to the wire (43), and the thermometer (7) is used to collect heat data of the thermocouple wire (1); A processor (8) is connected to the fiber optic Bragg grating demodulator (6) and the temperature measuring instrument (7) by signals, and the processor (8) is used to output a solidification stress abnormality detection result of the nozzle (2) to be tested according to temperature parameters and coupling data.

7. A monitoring method using the abnormality monitoring device for a composite nozzle as claimed in claim 1, characterized in that: include: A thermocouple wire (1) and a strain sensor are pre-buried in a nozzle (2) to be tested; The nozzle (2) to be tested is solidified, and coupling data and thermal data of the thermocouple wire (1) and the strain sensor are collected using a data processing component; It is determined whether the nozzle (2) to be tested has abnormal curing stress according to the reference data group and the curing data group.

8. The monitoring method according to claim 7, characterized in that: The thermocouple wire (1) and the strain sensor are embedded in the nozzle (2) to be tested, comprising: A thermocouple wire (1) and two sensing optical fibers (5) are arranged at the interface (21) to be tested of the nozzle (2) to be tested, and the two sensing optical fibers (5) are symmetrically arranged with the thermocouple wire (1) as the center.

9. The monitoring method according to claim 8, characterized in that: The data processing component is used to collect coupling data and thermal data of the thermocouple wire (1) and the strain sensor, including: Using a data processing component to collect coupling data and thermal data of the thermocouple wire (1) and the strain sensor in an initial state as a reference data set; The coupling data and heat data of the thermocouple wire (1) and the strain sensor during the curing process of the nozzle (2) to be tested are collected by a data processing component as a curing data group.

10. The monitoring method according to claim 9, characterized in that: The step of judging whether the nozzle (2) to be tested has abnormal curing stress according to the reference data group and the curing data group comprises: A difference coefficient index is calculated based on the reference data set and the solidification data set, and it is determined based on the difference coefficient index whether the nozzle (2) to be tested has abnormal solidification stress.

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