CN116001273B - Geocell 3D printing device of wavelength modulation type sensor and packaging calibration method - Google Patents
Geocell 3D printing device of wavelength modulation type sensor and packaging calibration method Download PDFInfo
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- CN116001273B CN116001273B CN202310039411.0A CN202310039411A CN116001273B CN 116001273 B CN116001273 B CN 116001273B CN 202310039411 A CN202310039411 A CN 202310039411A CN 116001273 B CN116001273 B CN 116001273B
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses a geocell 3D printing device and a packaging calibration method of a wavelength modulation type sensor, the method comprises printing equipment for preparing a geocell 3D model, a method for packaging a wavelength modulation type sensor in a 3D printed geocell and a calibration method for the relation between wavelength change and strain change of the wavelength modulation type sensor packaged in the geocell. According to the method, the wavelength modulation type sensor is embedded in the geocell through a 3D printing technology, the geocell is directly used as a packaging structure of the wavelength modulation type sensor, the optical fiber packaging requirement is met, meanwhile, the coordinated deformation of a grating monitoring area of the wavelength modulation type sensor and a measured object (namely the geocell) is guaranteed, the deformation monitoring precision is improved, the strain loss of a traditional packaging mode (such as surface pasting or adhesive tape) is avoided, the 3D printed geocell is strong in integrity, and the problems of low strength and poor connectivity of nodes of the geocell can be solved.
Description
Technical Field
The invention relates to the field of 3D geotechnical models and civil engineering detection, in particular to a geotechnical grid 3D printing device and a packaging calibration method of a wavelength modulation type sensor.
Background
3D printing is a technology of constructing a model by stacking and accumulating corresponding printing materials layer by layer according to different requirements through a model file. 3D printing is attracting more and more attention in the field of civil engineering, and carbon fiber is one of 3D printing materials, and a model is constructed by stacking and accumulating layers by layers, namely, melting the model at high temperature and extruding a wire to print a required shape.
The reinforcement function of the geocell is to place the geocell in the soil body as a reinforcing member, or the geocell and the soil body together form a composite body so as to improve the overall strength of the soil body, limit the deformation of the soil body and adjust the stress distribution in the soil body, thereby improving the stability of the soil body. The earthwork cell is applied to engineering and has the greatest characteristic of ecological environmental protection, and can carry out green treatment on the surface of the structure, so that the structure is more ecological and environment-friendly, and the requirements of the current green engineering are met. For the measurement of deformation and stress of a geocell, when an indoor model test of civil engineering is carried out, the deformation is tiny, the sensing precision of a traditional sensor is difficult to meet the requirement, and a measuring tool and a measuring method which have long service lives and can be directly measured are urgently needed in the indoor model test of the civil engineering.
The wavelength modulation type sensing technology has the advantages of high sensitivity, electromagnetic interference resistance, real-time monitoring and the like, and is more and more concerned in the field of civil engineering. Since the deformation of the grating area is extremely sensitive to the wavelength change, the wavelength modulation type sensor is used for measuring the strain of the geotechnical model, so that the micro deformation of the material can be accurately monitored.
However, the common geocell has the disadvantage that the nodes of the cell sheets are weak, and uneven stress is easy to occur. If the strength of the geocell nodes is too low, sheeting lodging or serious deformation easily occurs in the construction process. And the traditional external packaging mode of the wavelength modulation type sensing technology is difficult to realize complete coordination deformation of the sensor and the measured object, and measurement errors are easy to cause.
Disclosure of Invention
The invention aims to: in order to overcome the defects, the invention provides a 3D printing preparation device and a packaging calibration method for integrating a wavelength modulation type sensor with a geocell. The geocell combines the advantages of the wavelength modulation type sensing technology and the geocell through the 3D printing technology, the wavelength modulation type sensor is built in the geocell, the geocell is directly used as a packaging structure of the wavelength modulation type sensor, the complete coordinated deformation of a grating monitoring area of the wavelength modulation type sensor and an object to be tested (namely the geocell) is ensured while the optical fiber packaging requirement is met, and the strain loss of the traditional packaging mode (such as adhesive tape type and surface pasting type) is avoided. And the 3D printed geocell has strong integrity, and can also solve the problems of low strength, poor connectivity and the like of the geocell nodes.
The technical scheme is as follows: the geotechnical cell 3D printing device of the wavelength modulation type sensor is characterized in that the geotechnical cell 3D printing device (1) comprises a hot bed (2), a stepping motor (3), a spray head (4), an X-Y-Z three-dimensional transmission system and a limit switch (8); the hot bed (2) receives and heats geocell raw materials sprayed out of the spray head (4), and the X-Y-Z three-dimensional transmission system drives the spray head (4) and the hot bed (2) to move in a two-dimensional plane in the X direction and the Y direction and drives the spray head (4) to move up and down in the Z direction;
the shower nozzle (4) is including preheating subassembly (401), resistance heater (402), nozzle (403), cooling tube (404) and conveying pipeline (405), preheat the printing high temperature material through preheating subassembly (401) at first and use enclosed construction to slow down the change of temperature, form a stable printing temperature and reduce the difference in temperature between printing forming temperature and the printing ambient temperature, conveying pipeline (405) is arranged in cooling tube (404), and conveying pipeline (405) stretches out outside preheating subassembly (401), be connected with nozzle (403), resistance heater (402) are arranged in on preheating subassembly (401).
Further, the X-Y-Z three-dimensional transmission system comprises an X-axis transmission device (5), a Y-axis transmission device (6) and a Z-axis transmission device (7), when the Y-axis transmission device (6) controls the Y-axis direction to move, the hot bed (2) is arranged on the sliding block (604), the sliding block (604) is arranged on the sliding rail (601), and the sliding block (604) moves on the sliding rail (601) along the Y-axis direction through the Y-axis stepping motor (603) on the guide shaft (602), so that the hot bed (2) is driven to move along the Y-axis direction. The drive direction of the slide is determined by a guide shaft (602).
Furthermore, the hot bed (2) adopts a PCB hot bed, and has the advantages of uniform heating and small volume. The thermal bed is used for receiving and heating the geocell raw materials sprayed by the spray head, constant higher ambient temperature is obtained through the thermal bed, deformation of the 3D printing geocell is reduced, quality problems such as edge warping and spalling are effectively solved, and the wavelength modulation type sensor (904) can be guaranteed to be in coordinated deformation with the 3D printing geocell (9).
A geocell 3D printing encapsulation calibration method of a wavelength modulation type sensor using the device comprises the following steps:
(a) A three-dimensional model of the geocell is designed in advance, the modeling size and the mesh shape of the geocell are controlled according to the three-dimensional model, and the relative height and the position of the spray head (4) and the hot bed (2) are adjusted by controlling an X-Y-Z three-dimensional transmission system;
(b) Placing a printer of the geocell 3D model into an environment with 15-35 ℃ and humidity of 20-50%, printing the geocell 3D model sliced by slicing software, stopping printing the geocell when the printer is printed to 50% of the geocell height, forming a lower geocell (903), and reserving a notch (902) on the lower geocell (903) by using a notch machine according to notch information, wherein the notch information comprises the diameter size of a wavelength modulation type sensor, the three-dimensional packaging position and the shape size of the geocell. Embedding the wavelength modulation type sensor into a reserved notch (902) by using strong glue when the temperature of the lower geotechnical grid (903) is reduced to 30-70 ℃, downwards regulating a hot bed (2) by 0.1-0.3mm after the wavelength modulation type sensor (904) is completely fixed, printing the residual upper geotechnical grid (901), removing auxiliary supports, and applying pressure on the grid packaged by the sensor to enable the upper and lower layers of 3D printed geotechnical grid (9) to be fully bonded;
(c) The bare fiber led out of the geocell is protected by a sleeve, the mechanical properties of the fiber core layer, the cladding layer and the coating layer are required to be the same, the fiber bragg grating and the sleeve are consistent with the deformation of the 3D printing geocell, and the connecting part of the sleeve and the geocell is bonded by epoxy resin glue.
Further, the calibration method of the relation between the wavelength change and the strain change of the wavelength modulation sensor (904) packaged in the geocell comprises the following steps:
(1) The temperature of the model just finished with 3D printing is higher, the wavelength modulation type sensor (904) can be subjected to high temperature to generate tensile strain when being placed in a geocell notch, the material after encapsulation is hardened to have residual strain, and the strain caused by temperature and material hardening factors is compensated through a preset compensator (905); the wavelength modulation type sensor (904) is susceptible to temperature and residual strain, and needs to be packaged in a 3D printed geocell which is not fully consolidated and formed, (the fully consolidated cell has better plasticity so that the sensor is packaged in a notch), but the influence of the temperature and the residual strain when the cell is hardened on the sensor is not negligible, and the calibration method is innovated by mainly compensating the residual strain caused by the sensor temperature and the cell hardening through a preset compensator (905).
(2) After the wavelength of the wavelength modulation type sensor (904) is stable in a natural state, the geocell is loaded step by weights to apply tension to the geocell, so that the geocell is stretched for multiple times, wavelength measurement is carried out on a grating area in each stretching, and an average value of the multiple measured wavelengths is taken to represent the real wavelength;
(3) Calibrating the wavelength modulation sensor (904) in a step-by-step unloading mode;
(4) By fitting, a good linear relationship exists between the wavelength variation and the stress variation of the wavelength modulation sensor (904) packaged in the 3D printed geocell.
Further, the modeling size of the geocell is: the height of the cells is 100-240mm, the node distance is 250-480mm, the thickness of the sheet is more than or equal to 1.3mm, the node distance of the common geocell height is fixed, and the 3D printing can print the geocells with different heights, node distances and thicknesses at different positions according to engineering requirements.
Further, the 3D printing geocell is made of carbon fiber materials. The carbon fiber has higher axial strength, no creep and smaller strain under experimental conditions, and is suitable for being applied to 3D geocell model printing.
Furthermore, the extrusion speed of the spray head (4) is regulated to be 360-720 r/min, and the filling speed is matched with the extrusion speed, so that the air-moving process of the spray head (4) is smoother; the printer heating temperature is stabilized by the hot bed (2), the closed spray head (4), the preheating component (401) and the resistance heater (402) to be more than 320 ℃, so that the carbon fiber wires can be melted rapidly, and the materials are easy to extrude.
The beneficial effects are that: 1. PLA is used as a 3D printing material most commonly used in a laboratory, has good tensile strength and extensibility, but when the PLA is packaged in a model test after a wavelength modulation type sensor, the strain of the PLA is larger, and the strain of a geocell in the test is easy to exceed the measurement range of the wavelength modulation type sensor; compared with PLA, the carbon fiber has higher axial strength, no creep and smaller strain under the same experimental condition, and is more suitable for being applied to model tests. And the invention is realized by the following special printing device: the closed spray head, the preheating component, the resistance heating rod and the PCB hot bed can enable the heating temperature of the printer to be stable above 320 ℃, and can melt carbon fiber wires so as to facilitate extrusion of materials.
2. The traditional external packaging mode is difficult to realize the coordinated deformation of the wavelength modulation type sensor and the geocell, and measurement errors are easy to cause. The 3D printing technology is adopted to completely encapsulate the wavelength modulation type sensor in the 3D printing geocell model, so that the fixing mode of directly wrapping the grating by the adhesive tape or the surface pasting type in the prior art is improved, the service life of the grating is prolonged, and meanwhile, the influence of the adhesive tape on the overall strength of the geocell is prevented. The cell and the wavelength modulation type sensor have excellent overall performance, and the coordinated deformation of the wavelength modulation type sensor and the geocell to be tested is realized.
3. The invention adopts a 3D printing technology, is not limited by the shape of the model geocell, has strong integrity, and can solve the problems of low strength, poor connectivity and the like of the nodes of the geocell.
4. According to the invention, through the calibration experiment, the strain value of the 3D printed geocell is directly measured in actual measurement by the calibration result obtained in advance, and the situation that stress parameters cannot be obtained due to the lack of related physical property indexes of the reinforced material in actual engineering or geotechnical test can be made up by the operation, so that the calculation step of conversion of the elasticity modulus of the geocell is avoided, and meanwhile, the data processing process is simplified.
Drawings
FIG. 1 is a printing apparatus for preparing a 3D model of a geocell in accordance with the present invention
FIG. 2 is a schematic view of a head assembly of the printing apparatus of the present invention;
FIG. 3 is a schematic view of a Y-axis actuator of the printing apparatus of the present invention;
FIG. 4 is a schematic illustration of a wavelength modulated sensor of the present invention- -3D printed geocell;
FIG. 5 is a top and bottom model view of a 3D printed geocell, a wavelength modulated sensor of the present invention;
FIG. 6 is a schematic illustration of a wavelength modulated sensor of the present invention packaged in a 3D printed geocell;
Fig. 7 is a graph of the fitted wavelength modulated sensor strain versus wavelength variation.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the printing equipment 1 for preparing the geocell 3D model is provided with a hot bed 2, a stepping motor 3, a spray head 4, an X-Y-Z three-dimensional transmission system, a limit switch 8 and other devices. The printer frame of the printing equipment for preparing the geocell 3D model adopts the aluminum profile, and the limit switch 8 adopts the photoelectric switch, so that the service life is long and the precision is high.
The device for printing the geocell by the wavelength modulation type sensor-3D has the molding technology of FDM (Fused Deposition Modelling, hot melting, piling, curing and molding), the printing precision of 0.1mm and supports printing materials including carbon fiber, PLA, TPU, ABS and other consumables. The modeling system is used for designing a three-dimensional model of a model geocell in advance, modeling size and mesh shape of the geocell, and controlling the X-Y-Z three-dimensional transmission system to adjust the relative height and position of the spray head and the printer hot bed according to the three-dimensional model. The wavelength modulation type sensor is better packaged in the geocell, so that the measurement data of the wavelength modulation type sensor is more accurate.
As shown in figures 4-5, the modeling size and shape of the geocell of the invention refer to the non-porous geocell for laboratory, the height of the geocell is 100-240mm, the node distance is 250-480mm, and the thickness of the sheet is more than or equal to 1.3mm.
The hot bed 2 adopts a PCB hot bed, and has the advantages of uniform heating and small volume. The thermal bed 2 is used for receiving and heating the geocell raw materials sprayed by the spray head 4, constant higher ambient temperature is obtained, deformation of the geocell after 3D printing is reduced, quality problems such as edge warping and spalling can be effectively overcome, and the wavelength modulation type sensor 904 can be ensured to be in coordinated deformation with the geocell after 3D printing to increase the adhesion degree of the raw materials and the bottom plate.
As shown in fig. 2, the spray head 4 according to the present invention firstly preheats the printing high temperature material by the preheating component 401 and uses the closed structure to slow down the temperature change, so as to form a stable printing temperature and reduce the temperature difference between the printing forming temperature and the printing environment temperature. Consists of a preheating component 401, a resistance heater 402, a nozzle 403, a radiating pipe 404 and a feed pipe 405. A feed pipe 405 is disposed in the heat pipe 404, and the feed pipe 405 extends out of the preheating module 401, is connected to the nozzle 403, and a resistive heater 402 is disposed on the preheating module 401.
As shown in FIG. 3, the X-Y-Z three-dimensional transmission system 6 adopts a belt transmission mode, for example, the printer adopts a Y-axis movement mode, wherein the hot bed 2 is arranged on the sliding block 604, the sliding block 604 is arranged on the sliding rail 601, and the sliding block 604 moves on the sliding rail 601 along the Y direction through the Y-axis stepping motor 603, so that the hot bed 2 is driven to move along the Y direction. The above device operates by means of an X-Y-Z three-dimensional transmission system 6.
The slide rail 601 adopts a linear rail, and has high precision, small volume and good strength;
the X-Y-Z three-dimensional transmission system drives the printer hot bed 2 and the spray head 4 to do two-dimensional plane movement in the X-Y direction and drives the spray head 4 to do up-and-down movement in the Z-axis direction.
The method for packaging the wavelength modulation type sensor 904 in the 3D printing geocell by adopting the printing equipment 1 for preparing the geocell 3D model comprises the following steps:
(1) Referring to a laboratory non-porous geocell made of polyethylene, as shown in fig. 4, a three-dimensional model of the geocell in an STL format is manufactured by modeling software and a laying mode of the model in a soil body is designed;
(2) After the geocell 3D model is manufactured, STL inspection is firstly required to be carried out on the polygonal surface through STL file editing software, and printing can be carried out after the inspection and modification are finished.
(3) And 3D printing slicing software is used for realizing parameter adjustment of the 3D geocell model, slicing the geocell model into a format which can be identified by a 3D printer, and finally, sending the 3D geocell model to the 3D printer for printing.
(4) Placing a printer of the geocell 3D model into an environment with 15-35 ℃ and humidity of 20-50%, printing the geocell 3D model sliced by slicing software, stopping printing on an upper layer when the printer is printed to 50% of the height of the cell, and reserving a notch 902 on the cell at the moment by a notch information, wherein the notch information comprises the diameter size of the wavelength modulation type sensor 904, the packaging three-dimensional position and the shape size of the cell by using a notch machine in order to enable the wavelength modulation type sensor 904 to be packaged more accurately and conveniently and avoid damage. When the temperature of the lower geotechnical cells 903 is reduced to 30-70 ℃, embedding the wavelength modulation type sensor 904 into the reserved notch 902 by using strong glue, downwards regulating the thermal bed 2 by 0.1-0.3mm after the wavelength modulation type sensor 904 is completely fixed, printing the residual upper geotechnical cells 901, removing auxiliary supports, and applying pressure on the cells packaged by the sensor, so that the upper and lower layers of 3D printed geotechnical cells are fully bonded.
(5) Bare fibers led out of the geocell are protected by a PVC sleeve with the diameter of 2mm, the mechanical properties of a fiber core layer, a cladding layer and a coating layer of the optical fibers are required to be the same, the wavelength modulation type sensor and the outer PVC heat shrinkage sleeve are deformed consistent with the 3D printed geocell, and the sleeve is bonded with the connecting part of the geocell by epoxy resin glue.
(6) The 3D printing geocell is made of carbon fiber materials.
(7) Further, in the step (4), the extrusion speed of the nozzle 403 is adjusted to 360-720 r/min, so that the filling speed is matched with the extrusion speed, and the idle running process of the nozzle is smoother. The printer heating temperature can be stabilized by more than 320 ℃ through the closed spray head 4, the preheating component 401, the resistance heating rod device 402 and the PCB hot bed 2, so that the carbon fiber wires can be melted rapidly, and the extrusion of materials is easy.
(8) Further, the method further comprises the steps of: since the measurement of the strain by the wavelength modulation type sensor 904 is achieved by collecting the wavelength variation of the wavelength modulation type sensor 904, the data output when the data is collected by the optical fiber demodulation collection instrument is the wavelength of light, and therefore, the relation between the wavelength variation and the strain variation of the wavelength modulation type sensor 904 needs to be established by a calibration test.
(9) Further, the method further comprises the steps of: because the temperature of the model just after 3D printing is high, the wavelength modulation sensor 904 is subjected to high temperature to generate tensile strain when just placed in the geocell notch 902, and the packaging end material is hardened to bring residual strain. As shown in fig. 6, the strain caused by temperature, material hardening, etc. is compensated for by presetting a compensation 905 device.
(10) Further, the calibration method of the relation between the wavelength variation and the strain variation of the wavelength modulation sensor packaged in the 3D printing geocell further comprises the following steps: after the wavelength of the wavelength modulation sensor 904 is stable in a natural state, a weight is used for loading step by step to apply tension, the geocell is stretched for 10mm, 20mm and 30mm for many times, the wavelength of the grating region is measured, and the average value of the measured wavelengths is taken to represent the real wavelength. The wavelength modulated sensor 904 is calibrated in a step-wise off-load fashion. Calibrating the wavelength-modulated sensor 904, as shown in fig. 7, can obtain that there is a good linear relationship between the wavelength variation and the stress variation of the wavelength-modulated sensor 904 packaged in the 3D printed geocell by fitting.
The invention discloses a 3D printing preparation device integrating a wavelength modulation type sensor and a geocell and a packaging calibration method, wherein the wavelength modulation type sensor is embedded in the geocell by a 3D printing technology, the geocell is directly used as a packaging structure of the wavelength modulation type sensor, the optical fiber packaging requirement is met, the coordinated deformation of a grating monitoring area of the wavelength modulation type sensor and a measured object (namely the geocell) is ensured, the strain real-time and accurate measurement of the cell is directly realized by utilizing the wavelength modulation type sensing technology, the deformation monitoring precision is improved, the strain loss of a traditional packaging mode (such as surface pasting or adhesive tape) is avoided, the integrity of the 3D printed geocell is strong, and the problems of low node strength and poor connectivity of the geocell are solved.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several equivalent substitutions and obvious modifications can be made without departing from the spirit of the invention, and the same should be considered to be within the scope of the invention.
Claims (6)
1. The geotechnical cell 3D printing, packaging and calibrating method of the wavelength modulation type sensor is characterized by comprising a geotechnical cell 3D printing device (1), wherein the geotechnical cell 3D printing device (1) comprises a hot bed (2), a stepping motor (3), a spray head (4), an X-Y-Z three-dimensional transmission system and a limit switch (8); the hot bed (2) receives and heats geocell raw materials sprayed out of the spray head (4), and the X-Y-Z three-dimensional transmission system drives the spray head (4) and the hot bed (2) to move in a two-dimensional plane in the X direction and the Y direction and drives the spray head (4) to move up and down in the Z direction;
The spray head (4) comprises a preheating component (401), a resistance heater (402), a nozzle (403), a radiating pipe (404) and a conveying pipe (405), wherein the preheating component (401) is used for preheating printing high-temperature materials and reducing the temperature change by using a closed structure to form a stable printing temperature and reduce the temperature difference between the printing forming temperature and the printing environment temperature, the conveying pipe (405) is arranged in the radiating pipe (404), the conveying pipe (405) extends out of the preheating component (401) and is connected with the nozzle (403), and the resistance heater (402) is arranged on the preheating component (401);
The method comprises the following steps:
(a) A three-dimensional model of the geocell is designed in advance, the modeling size and the mesh shape of the geocell are controlled according to the three-dimensional model, and the relative height and the position of the spray head (4) and the hot bed (2) are adjusted by controlling an X-Y-Z three-dimensional transmission system;
(b) Placing a printer of a geocell 3D model into an environment with 15-35 ℃ and humidity of 20-50%, printing the geocell 3D model sliced by slicing software, stopping printing the geocell when the printer is printed to 50% of the height of the geocell to form a lower geocell (903), reserving a notch (902) on the lower geocell (903) by using a notch machine according to notch information, embedding a wavelength modulation type sensor into the reserved notch (902) when the temperature of the lower geocell (903) is reduced to 30-70 ℃, downwards regulating a hot bed (2) by 0.1-0.3mm after the wavelength modulation type sensor (904) is completely fixed, printing the rest upper geocell (901), and applying pressure on the cell packaged by the sensor after an auxiliary support is removed to enable the upper and lower 3D geoprinting cells (9) to be fully bonded;
(c) The bare fiber led out of the geocell is protected by a sleeve, the mechanical properties of the fiber core layer, the cladding layer and the coating layer are required to be the same, the fiber bragg grating and the sleeve are consistent with the deformation of the 3D printed geocell, and the connecting part of the sleeve and the geocell is bonded by epoxy resin glue;
a method of calibrating wavelength variation versus strain variation for a wavelength modulated sensor (904) encapsulated in a geocell, comprising the steps of:
(1) The temperature of the model just finished with 3D printing is higher, the wavelength modulation type sensor (904) can be subjected to high temperature to generate tensile strain when being placed in a geocell notch, the material after encapsulation is hardened to have residual strain, and the strain caused by temperature and material hardening factors is compensated through a preset compensator (905);
(2) After the wavelength of the wavelength modulation type sensor (904) is stable in a natural state, the geocell is loaded step by weights to apply tension to the geocell, so that the geocell is stretched for multiple times, wavelength measurement is carried out on a grating area in each stretching, and an average value of the multiple measured wavelengths is taken to represent the real wavelength;
(3) Calibrating the wavelength modulation sensor (904) in a step-by-step unloading mode;
(4) By fitting, a good linear relationship exists between the wavelength variation and the stress variation of the wavelength modulation sensor (904) packaged in the 3D printed geocell.
2. The method for calibrating the 3D printing package of the geocell of the wavelength modulation sensor according to claim 1, wherein the X-Y-Z three-dimensional transmission system comprises an X-axis transmission device (5), a Y-axis transmission device (6), a Z-axis transmission device (7), wherein when the Y-axis transmission device (6) controls the Y-axis direction to move, the thermal bed (2) is placed on the sliding block (604), the sliding block (604) is placed on the sliding rail (601), and the sliding block (604) is moved on the sliding rail (601) along the Y-axis direction by the Y-axis stepping motor (603) on the guide shaft (602), so as to drive the thermal bed (2) to move along the Y-axis direction.
3. The geocell 3D printing, packaging and calibrating method of the wavelength modulation type sensor according to claim 1, wherein the thermal bed (2) is a PCB thermal bed and is used for receiving geocell raw materials sprayed by a spray head and heating, so that the wavelength modulation type sensor (904) can be coordinated and deformed with the 3D printed geocell (9).
4. The geocell 3D print package calibration method of the wavelength modulated sensor of claim 1, wherein the modeling dimensions of the geocell are: the height of the cell is 100-240mm, the distance between nodes is 250-480mm, and the thickness of the sheet is more than or equal to 1.3mm.
5. The geocell 3D printing, packaging and calibrating method of the wavelength modulation sensor according to claim 1, wherein the 3D printing geocell is made of carbon fiber materials.
6. The geocell 3D printing and packaging calibration method of the wavelength modulation sensor according to claim 5, wherein the extrusion speed of the nozzle (4) is adjusted to 360-720 r/min, and the filling speed is matched with the extrusion speed, so that the air-moving process of the nozzle (4) is smoother; the printer heating temperature is stabilized to be more than 320 ℃ by a hot bed (2), a closed nozzle (4), a preheating component (401) and a resistance heater (402).
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| CN113752541A (en) * | 2021-04-08 | 2021-12-07 | 长江水利委员会长江科学院 | Device and method for preparing fiber grating model geogrid based on 3D printing |
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