CN111811737A - Method for manufacturing experimental operation pipeline for low-vacuum magnetic suspension transportation - Google Patents
Method for manufacturing experimental operation pipeline for low-vacuum magnetic suspension transportation Download PDFInfo
- Publication number
- CN111811737A CN111811737A CN202010595413.4A CN202010595413A CN111811737A CN 111811737 A CN111811737 A CN 111811737A CN 202010595413 A CN202010595413 A CN 202010595413A CN 111811737 A CN111811737 A CN 111811737A
- Authority
- CN
- China
- Prior art keywords
- pipeline
- vacuum
- manufacturing
- magnetic suspension
- heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Abstract
A method for manufacturing an experimental operation pipeline for low-vacuum magnetic suspension transportation belongs to the field of operation pipelines for magnetic suspension transportation. The manufacturing method comprises the following steps: step 1, manufacturing a closed pipeline; step 2, selecting and installing vacuum-pumping equipment; step 3, installing heating equipment; step 4, arranging and installing strain gauges; step 5, assembling and debugging the system; and 6, acquiring and analyzing experimental data. The method is used for developing indoor model experimental research of the concrete pipeline under the low-vacuum complex working condition, evaluating the applicability of the concrete pipeline structure under the low-vacuum complex environment based on the acquisition and analysis of relevant data such as mechanical behavior and sealing performance of the pipeline structure under the working conditions of internal low vacuum, internal and external temperature difference, external water pressure, special circulating load and the like, judging the stress and sealed weak part of the structure, providing a targeted optimization and transformation scheme and verifying, and providing basic data support and technical support for the application of the subsequent concrete pipeline in low-vacuum magnetic suspension transportation.
Description
Technical Field
The invention relates to the field of running pipelines for magnetic suspension transportation, in particular to a method for manufacturing an experimental running pipeline for low-vacuum magnetic suspension transportation.
Background
Due to the limitations of air resistance, wheel-rail friction and running noise, the wheel-rail type traffic is difficult to economically realize great improvement of the operation speed in the prior art level. By utilizing the magnetic suspension technology, the vacuum operation environment is constructed, so that the air resistance and the noise can be reduced, and the requirement of higher economic operation speed is met, namely the vacuum pipeline magnetic suspension transportation technology. The technology mainly comprises two parts, namely a pipeline and a maglev train, one of the current technical limitations lies in the research of the vacuum pipeline, and because the running speed of the vacuum pipeline train is high, once the pipeline is damaged and leaks, the life safety of passengers can be seriously harmed, a safe vacuum pipeline environment is constructed, the reliability of the structure of the vacuum pipeline is ensured, low vacuum negative pressure is maintained, and the technology is one of key technologies for developing high-speed traffic, so that the research on the pipeline is very necessary.
For the vacuum pipeline transportation system to maintain large space and long-time vacuum degree in the pipeline, the sealing performance of the pipeline structure is key; the low vacuum pipeline bears the internal and external air pressure difference for a long time, and the deformation and the maintenance of the stress performance are also required to be studied experimentally; the high-speed operation of train can show the inboard ambient temperature that improves the section of jurisdiction in the pipeline for the structure bears the temperature stress that the inside and outside difference in temperature arouses, and these operating modes need develop the experiment and explore the intensity of section of jurisdiction and sealed influence.
Disclosure of Invention
The invention aims to provide a method for manufacturing an experimental operation pipeline for low-vacuum magnetic suspension transportation, which has good pipeline sealing performance and strong pressure resistance.
The purpose of the invention is realized as follows: the experimental operation pipeline manufacturing method comprises the following steps:
step 1, manufacturing a closed pipeline;
step 2, selecting and installing vacuum-pumping equipment;
step 3, installing heating equipment;
step 4, arranging and installing strain gauges;
step 5, assembling and debugging the system;
and 6, acquiring and analyzing experimental data.
The method comprises the following specific steps:
step 1. the concrete steps of the manufacturing of the closed pipeline are as follows:
manufacturing a pipeline; determining the size, structural strength and reinforcing bars of a model pipeline according to the size and the similarity ratio of a prototype pipeline, thickening the end parts of two ends of the pipeline and embedding a steel ring in advance, welding an anchor bar at one side of the steel ring for reinforcing the integrity with the pipeline, and arranging bolt holes at the other side of the steel ring along the circumference of the steel ring for connecting with a plugging steel plate; the plugging steel plate is hermetically connected with the embedded steel ring through bolts and sealing rings, a sealing adapter and a pipeline sealing interface are arranged on the plugging steel plate and used for leading out a heating power line and a sensor circuit in the pipeline, a waterproof protection bent pipe is arranged to lead out the circuit from the water surface, and the pipeline interface is used for connecting a vacuum pump pipeline;
then, manufacturing a pipeline mould; processing and manufacturing the embedded steel ring and the plugging steel plate, and welding a steel reinforcement cage;
pouring and maintaining the pipeline; after the pipeline meets the strength requirement, the pipeline is hung on a support at the bottom of the water pool and anchored to the bottom plate of the water pool by a steel wire rope so as to prevent the pipeline in the water environment from floating upwards.
Step 2, the concrete steps of the model selection and installation of the vacuum pumping equipment are as follows:
the vacuum system includes: the system comprises a vacuum pump, an air inlet filter, a cold-heat exchanger, a cooling system, an electric controller box, a unit base, a check valve, a manual ball valve, a corrugated pipe, a pressure sensor and a pipeline valve; the vacuum system sets and maintains the specified absolute pressure through a vacuum pump, a vacuum gauge and a controller;
according to the ultimate low vacuum degree and the pipeline vacuumizing time, the type of the vacuum pump with the flow meeting the requirement is selected, a water circulation cooling system is added, and the influence of a high-temperature medium on the working performance of the vacuum pump is reduced;
the vacuum pump is connected with the pipeline in a sealing way through a side plugging steel plate.
And 3, the specific steps of the installation of the heating equipment are as follows:
the heating system includes: the system comprises a transparent short wave twin pipe, a temperature sensor, a temperature acquisition system and a temperature control system;
the inner wall of the pipeline is heated through the transparent short wave twin pipe, the short wave twin pipe is placed on the light-duty triangular support and arranged along the circumference of the pipeline, the heating system detects the temperature inside the pipeline through a thermocouple, the power voltage regulator is controlled in real time through the temperature controller, the power output power is changed, and the heating pipe heating amount is adjusted to reach the set temperature.
And 4, arranging and mounting the strain gauge specifically comprising the following steps:
the utility model discloses a pipeline, including pipeline middle section, the pipeline of pipeline middle section is equipped with the transparent 704 silicon rubber and epoxy AB glue, the pipeline of pipeline middle section is equipped with the foil gage along the even foil gage of arranging of circumference, will paste the pipeline of foil gage department and polish smoothly, then paste with 502 glue and fix the foil gage on polishing smooth pipeline to use transparent 704 silicon rubber and epoxy AB glue to cover the foil gage, prevent that the foil gage temperature from receiving the environmental factor outside the pipeline and disturbing, compromise waterproof demand simultaneously.
And 5, specifically assembling and debugging the system, comprising the following steps:
after the strain gauges in the pipeline are fixedly installed, after the heating short wave twin pipe is placed in place, the sensor and a power supply circuit are led out through the plugging steel plate adapter, the heating system is subjected to power-on inspection, after the heating short wave twin pipe is confirmed to operate normally, the pipeline plugging steel plate is installed, the pipeline of the vacuum pump is connected to an outer side interface of the plugging steel plate, the wiring of the strain gauges inside and outside the pipeline is connected to the data acquisition instrument, test operation of the whole system is carried out, the vacuum pump, the heating equipment and the data acquisition equipment are started to operate through the control system sequentially, and normal operation conditions of all modules are observed and checked.
Step 6, the concrete steps of experimental data acquisition and analysis are as follows:
the strain gauge is connected to the acquisition instrument through a shielding wire, the shielding wire is used for reducing the interference of the environment on the acquired information, the acquired data are sorted and analyzed to obtain the change rule of the strain value of each monitoring point along different loading working conditions, the maximum strain value distribution rule of the pipeline along the circumference under each loading working condition, and the change rule of the vacuum degree in the pipeline along with the time after the pressure stabilizing system is closed.
Under the heating condition, the actually measured data of the strain gauge is corrected by considering the following three factors: 1) actual deformation of the structure under test; 2) the thermal expansion amount of the strain gauge resistance wire; 3) a change in strain gauge resistivity.
The beneficial effects are that, by adopting the scheme, the indoor model experimental study under the low-vacuum complex working condition is developed aiming at the concrete pipeline, the applicability of the concrete pipeline structure under the low-vacuum complex environment is evaluated based on the acquisition and analysis of relevant data such as the mechanical behavior and the sealing performance of the pipeline structure under the working conditions of internal low vacuum, internal and external temperature difference, external water pressure and special cyclic load, the stress and the sealed weak part of the structure are judged, the targeted optimization and transformation scheme is provided and verified, and basic data support and technical support are provided for the application of the subsequent concrete pipeline in the low-vacuum magnetic suspension transportation.
By adopting the experimental method, the internal low-vacuum negative pressure working condition of the low-vacuum pipeline structure, the internal and external temperature difference condition of the structure caused by driving and the external water environment are effectively simulated, the mechanical behavior and the sealing performance of the pipeline structure in the low-vacuum complex environment are obtained, and the experimental method is provided for the research on the reliability of the pipeline structure in the low-vacuum transportation system.
The sealing problem of the end part of the pipeline and the sealing leading-out problem of the internal wiring of the pipeline are solved, and the aim of the invention is achieved.
The device has the advantages that the loading simulation of the low-vacuum environment, the internal and external temperature difference and the like of the pipeline can be carried out through the control system.
Drawings
FIG. 1 is a flow chart of the experimental operation pipeline manufacturing method for low vacuum magnetic suspension transportation according to the invention.
Detailed Description
The experimental operation pipeline manufacturing method for low-vacuum magnetic suspension transportation comprises the following steps of:
step 1, manufacturing a closed pipeline;
step 2, selecting and installing vacuum-pumping equipment;
step 3, installing heating equipment;
step 4, arranging and installing strain gauges;
step 5, assembling and debugging the system;
and 6, acquiring and analyzing experimental data.
The method comprises the following specific steps:
step 1. the concrete steps of the manufacturing of the closed pipeline are as follows:
manufacturing a pipeline; determining the size, structural strength and reinforcing bars of a model pipeline according to the size and the similarity ratio of a prototype pipeline, thickening the end parts of two ends of the pipeline and embedding a steel ring in advance, welding an anchor bar at one side of the steel ring for reinforcing the integrity with the pipeline, and arranging bolt holes at the other side of the steel ring along the circumference of the steel ring for connecting with a plugging steel plate; the plugging steel plate is hermetically connected with the embedded steel ring through bolts and sealing rings, a sealing adapter and a pipeline sealing interface are arranged on the plugging steel plate and used for leading out a heating power line and a sensor circuit in the pipeline, a waterproof protection bent pipe is arranged to lead out the circuit from the water surface, and the pipeline interface is used for connecting a vacuum pump pipeline;
then, manufacturing a pipeline mould; processing and manufacturing the embedded steel ring and the plugging steel plate, and welding a steel reinforcement cage;
pouring and maintaining the pipeline; after the pipeline meets the strength requirement, the pipeline is hung on a support at the bottom of the water pool and anchored to the bottom plate of the water pool by a steel wire rope so as to prevent the pipeline in the water environment from floating upwards.
Step 2, the concrete steps of the model selection and installation of the vacuum pumping equipment are as follows:
the vacuum system includes: the system comprises a vacuum pump, an air inlet filter, a cold-heat exchanger, a cooling system, an electric controller box, a unit base, a check valve, a manual ball valve, a corrugated pipe, a pressure sensor and a pipeline valve; the vacuum system sets and maintains the specified absolute pressure through a vacuum pump, a vacuum gauge and a controller;
according to the ultimate low vacuum degree and the pipeline vacuumizing time, the type of the vacuum pump with the flow meeting the requirement is selected, a water circulation cooling system is added, and the influence of a high-temperature medium on the working performance of the vacuum pump is reduced;
the vacuum pump is connected with the pipeline in a sealing way through a side plugging steel plate.
And 3, the specific steps of the installation of the heating equipment are as follows:
the heating system includes: the system comprises a transparent short wave twin pipe, a temperature sensor, a temperature acquisition system and a temperature control system;
the inner wall of the pipeline is heated through the transparent short wave twin pipe, the short wave twin pipe is placed on the light-duty triangular support and arranged along the circumference of the pipeline, the heating system detects the temperature inside the pipeline through a thermocouple, the power voltage regulator is controlled in real time through the temperature controller, the power output power is changed, and the heating pipe heating amount is adjusted to reach the set temperature.
And 4, arranging and mounting the strain gauge specifically comprising the following steps:
the utility model discloses a pipeline, including pipeline middle section, the pipeline of pipeline middle section is equipped with the transparent 704 silicon rubber and epoxy AB glue, the pipeline of pipeline middle section is equipped with the foil gage along the even foil gage of arranging of circumference, will paste the pipeline of foil gage department and polish smoothly, then paste with 502 glue and fix the foil gage on polishing smooth pipeline to use transparent 704 silicon rubber and epoxy AB glue to cover the foil gage, prevent that the foil gage temperature from receiving the environmental factor outside the pipeline and disturbing, compromise waterproof demand simultaneously.
And 5, specifically assembling and debugging the system, comprising the following steps:
after the strain gauges in the pipeline are fixedly installed, after the heating short wave twin pipe is placed in place, the sensor and a power supply circuit are led out through the plugging steel plate adapter, the heating system is subjected to power-on inspection, after the heating short wave twin pipe is confirmed to operate normally, the pipeline plugging steel plate is installed, the pipeline of the vacuum pump is connected to an outer side interface of the plugging steel plate, the wiring of the strain gauges inside and outside the pipeline is connected to the data acquisition instrument, test operation of the whole system is carried out, the vacuum pump, the heating equipment and the data acquisition equipment are started to operate through the control system sequentially, and normal operation conditions of all modules are observed and checked.
Step 6, the concrete steps of experimental data acquisition and analysis are as follows:
the strain gauge is connected to the acquisition instrument through a shielding wire, the shielding wire is used for reducing the interference of the environment on the acquired information, the acquired data are sorted and analyzed to obtain the change rule of the strain value of each monitoring point along different loading working conditions, the maximum strain value distribution rule of the pipeline along the circumference under each loading working condition, and the change rule of the vacuum degree in the pipeline along with the time after the pressure stabilizing system is closed.
Under the heating condition, the actually measured data of the strain gauge is corrected by considering the following three factors: 1) actual deformation of the structure under test; 2) the thermal expansion amount of the strain gauge resistance wire; 3) a change in strain gauge resistivity.
The embodiments of the present invention will be further described with reference to the accompanying drawings and specific embodiments:
example 1: as shown in fig. 1, the development of the indoor low-vacuum pipeline model experiment includes design and manufacture of a closed pipeline, design and installation of heating equipment, design and selection of vacuum-pumping equipment, arrangement and installation of strain gauges, system assembly and debugging, experimental data acquisition and analysis, and the like.
The simulated low vacuum pipeline has the inner diameter of 11.4m, the wall thickness of 550mm, the geometric similarity ratio of 10 and the volume-weight similarity ratio of 1. The outer diameter of the model test pipeline is 1.25m, the wall thickness is 55mm, and the total length is 3 m. The structural strength grade is C60, the pouring pipeline adopts high-strength mortar doped with fly ash, steel fiber, additives and the like, the mortar strength is ensured to meet the requirement through indoor experimental verification, and indexes such as mortar fluidity, shrinkage rate, permeability and the like are tested. A steel reinforcement cage is welded by adopting a phi 6.5 steel reinforcement of HPB300, and 60 longitudinal steel reinforcements are uniformly distributed along the circumference through the calculation of the bending strength of the pipeline. The circumferential steel bar meets the requirement of the similarity ratio according to the equivalent tensile rigidity EA, the reinforcement ratio is 2%, and the pitch of the circumferential steel bar is 30 mm.
The two ends of the pipeline are partially thickened to be 100mm and are embedded with steel members, and the two ends of the pipeline are connected with a sealing end cover to ensure the sealing of the ends of the segments. The end embedded part is 30mm in thickness, and 12 anchor bars with the diameter of phi 10 are uniformly welded along the circumferential direction and used for reinforcing the integrity of the embedded part and the pipeline. The sealing end cover is connected with the embedded part through bolts, the sealing performance of the connection is enhanced by adopting 2O-shaped rings, a 30-core sensor plug, a 5-core power plug and an air suction port are arranged in the middle of the sealing end cover, and effective waterproof measures are taken. The 30-core connector is used for signal transmission of a strain gauge and a temperature sensor, and the 5-core connector is used for power supply of a heating system.
The pipeline pouring adopts a customized wood mould, the end parts at two sides are thickened and steel rings are embedded in advance, after the reinforcement cage is in place, mortar is poured in a vertical layered mode, after the reinforcement cage is maintained to reach the strength, the mould is disassembled and lifted to the position of the water tank support, and the reinforcement cage is anchored to the ground through a steel wire rope so as to prevent the pipeline from floating upwards.
The temperature sensor is pre-buried and fixed at the corresponding position of the reinforcement cage before the pipeline mortar is poured. The inner wall of the center of the pipeline is uniformly pasted with 10 concrete strain gauges along the circumference, and the wiring is led to the end cover joint converter along the inner wall of the pipeline. The outer wall of pipeline center is evenly pasted 20 concrete foil gages along the circumference to effective waterproof measure is taken.
The heating system is formed by placing 6 transparent short wave twin pipes with the power of 2kw and the length of 1.3m in the pipeline
The tubes are mounted on triangular supports and arranged at 120 ° intervals along the circumference of the pipe. The inner wall of the pipeline is heated through the shortwave twin pipe, the temperature rise of a train passing at a high speed is simulated, and the highest temperature of the inner wall of the pipeline is set to be 60 ℃. The triangular support is arranged inside the pipeline in two sections, the K-type thermocouple is arranged inside the pipeline to collect the temperature of the inner wall, and the power line and the sensor cable are respectively connected out through the connector converters of the end covers.
The ultimate low vacuum degree of the test is 5kPa absolute pressure, the vacuumizing time is controlled to be 5min, and the flow requirement of a vacuum pump is 200m3H is used as the reference value. Considering the high-temperature working condition (60 ℃) of the working medium of the vacuum pump, a water cooling system is added to avoid the influence of the high-temperature medium on the working performance of the vacuum pump. The vacuum system sets and maintains the appointed absolute pressure through the vacuum pump, the vacuum meter and the controller, and the vacuum degree data in the pipeline can be continuously collected, stored and exported.
The vacuum pump pipeline is connected to the pipeline end cover, the end cover and the embedded part are fixedly installed through bolts and sealing rings, and the sensor pipeline is connected to the corresponding data acquisition instrument. And starting the vacuum pump system and the heating system in sequence to test the test system.
The method comprises the steps of loading and vacuumizing the interior of a pipeline cavity step by using vacuumizing equipment, adjusting the temperature of the interior of the pipeline cavity through a temperature control system, placing a model pipeline in a water pool, simulating low vacuum, high temperature and water environment, discussing the reliability of a pipeline structure integrating a tunnel and a pipe as a low vacuum magnetic suspension tunnel structure, and carrying out water tightness and air tightness research on the pipeline and mechanical behavior research on the structure. The experimental contents include, but are not limited to, the following aspects: researching water tightness of the pipeline under different vacuum degrees; the capability of the duct piece structure for maintaining the vacuum degree is researched; researching the stress deformation of the pipeline under different vacuum degrees; the structural performance is influenced by the temperature change in the segment ring cavity; the stress deformation rule of the pipeline structure under the repeated loading condition of vacuum-normal pressure.
Claims (7)
1. A method for manufacturing an experimental operation pipeline for low-vacuum magnetic suspension transportation is characterized by comprising the following steps: the experimental operation pipeline manufacturing method comprises the following steps:
step 1, manufacturing a closed pipeline;
step 2, selecting and installing vacuum-pumping equipment;
step 3, installing heating equipment;
step 4, arranging and installing strain gauges;
step 5, assembling and debugging the system;
and 6, acquiring and analyzing experimental data.
2. The method for manufacturing the experimental operation pipeline for the low vacuum magnetic suspension transportation according to claim 1, is characterized in that: step 1. the concrete steps of the manufacturing of the closed pipeline are as follows:
manufacturing a pipeline; determining the size, structural strength and reinforcing bars of a model pipeline according to the size and the similarity ratio of a prototype pipeline, thickening the end parts of two ends of the pipeline and embedding a steel ring in advance, welding an anchor bar at one side of the steel ring for reinforcing the integrity with the pipeline, and arranging bolt holes at the other side of the steel ring along the circumference of the steel ring for connecting with a plugging steel plate; the plugging steel plate is hermetically connected with the embedded steel ring through bolts and sealing rings, a sealing adapter and a pipeline sealing interface are arranged on the plugging steel plate and used for leading out a heating power line and a sensor circuit in the pipeline, a waterproof protection bent pipe is arranged to lead out the circuit from the water surface, and the pipeline interface is used for connecting a vacuum pump pipeline;
then, manufacturing a pipeline mould; processing and manufacturing the embedded steel ring and the plugging steel plate, and welding a steel reinforcement cage;
pouring and maintaining the pipeline; after the pipeline meets the strength requirement, the pipeline is hung on a support at the bottom of the water pool and anchored to the bottom plate of the water pool by a steel wire rope so as to prevent the pipeline in the water environment from floating upwards.
3. The method for manufacturing the experimental operation pipeline for the low vacuum magnetic suspension transportation according to claim 1, is characterized in that: step 2, the concrete steps of the model selection and installation of the vacuum pumping equipment are as follows:
the vacuum system includes: the system comprises a vacuum pump, an air inlet filter, a cold-heat exchanger, a cooling system, an electric controller box, a unit base, a check valve, a manual ball valve, a corrugated pipe, a pressure sensor and a pipeline valve; the vacuum system sets and maintains the specified absolute pressure through a vacuum pump, a vacuum gauge and a controller;
according to the ultimate low vacuum degree and the pipeline vacuumizing time, the type of the vacuum pump with the flow meeting the requirement is selected, a water circulation cooling system is added, and the influence of a high-temperature medium on the working performance of the vacuum pump is reduced;
the vacuum pump is connected with the pipeline in a sealing way through a side plugging steel plate.
4. The method for manufacturing the experimental operation pipeline for the low vacuum magnetic suspension transportation according to claim 1, is characterized in that: and 3, the specific steps of the installation of the heating equipment are as follows:
the heating system includes: the system comprises a transparent short wave twin pipe, a temperature sensor, a temperature acquisition system and a temperature control system;
the inner wall of the pipeline is heated through the transparent short wave twin pipe, the short wave twin pipe is placed on the light-duty triangular support and arranged along the circumference of the pipeline, the heating system detects the temperature inside the pipeline through a thermocouple, the power voltage regulator is controlled in real time through the temperature controller, the power output power is changed, and the heating pipe heating amount is adjusted to reach the set temperature.
5. The method for manufacturing the experimental operation pipeline for the low vacuum magnetic suspension transportation according to claim 1, is characterized in that: and 4, arranging and mounting the strain gauge specifically comprising the following steps:
the utility model discloses a pipeline, including pipeline middle section, the pipeline of pipeline middle section is equipped with the transparent 704 silicon rubber and epoxy AB glue, the pipeline of pipeline middle section is equipped with the foil gage along the even foil gage of arranging of circumference, will paste the pipeline of foil gage department and polish smoothly, then paste with 502 glue and fix the foil gage on polishing smooth pipeline to use transparent 704 silicon rubber and epoxy AB glue to cover the foil gage, prevent that the foil gage temperature from receiving the environmental factor outside the pipeline and disturbing, compromise waterproof demand simultaneously.
6. The method for manufacturing the experimental operation pipeline for the low vacuum magnetic suspension transportation according to claim 1, is characterized in that: and 5, specifically assembling and debugging the system, comprising the following steps:
after the strain gauges in the pipeline are fixedly installed, after the heating short wave twin pipe is placed in place, the sensor and a power supply circuit are led out through the plugging steel plate adapter, the heating system is subjected to power-on inspection, after the heating short wave twin pipe is confirmed to operate normally, the pipeline plugging steel plate is installed, the pipeline of the vacuum pump is connected to an outer side interface of the plugging steel plate, the wiring of the strain gauges inside and outside the pipeline is connected to the data acquisition instrument, test operation of the whole system is carried out, the vacuum pump, the heating equipment and the data acquisition equipment are started to operate through the control system sequentially, and normal operation conditions of all modules are observed and checked.
7. The method for manufacturing the experimental operation pipeline for the low vacuum magnetic suspension transportation according to claim 1, is characterized in that: step 6, the concrete steps of experimental data acquisition and analysis are as follows:
the strain gauge is connected to the acquisition instrument through a shielding wire, the shielding wire is used for reducing the interference of the environment on the acquired information, the acquired data are sorted and analyzed to obtain the change rule of the strain value of each monitoring point along different loading working conditions, the maximum strain value distribution rule of the pipeline along the circumference under each loading working condition, and the change rule of the vacuum degree in the pipeline along with the time after the pressure stabilizing system is closed.
Under the heating condition, the actually measured data of the strain gauge is corrected by considering the following three factors: 1) actual deformation of the structure under test; 2) the thermal expansion amount of the strain gauge resistance wire; 3) a change in strain gauge resistivity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010595413.4A CN111811737A (en) | 2020-06-28 | 2020-06-28 | Method for manufacturing experimental operation pipeline for low-vacuum magnetic suspension transportation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010595413.4A CN111811737A (en) | 2020-06-28 | 2020-06-28 | Method for manufacturing experimental operation pipeline for low-vacuum magnetic suspension transportation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111811737A true CN111811737A (en) | 2020-10-23 |
Family
ID=72855319
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010595413.4A Withdrawn CN111811737A (en) | 2020-06-28 | 2020-06-28 | Method for manufacturing experimental operation pipeline for low-vacuum magnetic suspension transportation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111811737A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107097802A (en) * | 2017-04-28 | 2017-08-29 | 北京机电工程研究所 | A kind of high reliability vacuum pipe system |
| CN108639071A (en) * | 2018-06-19 | 2018-10-12 | 成都市江泰真空镀膜科技有限公司 | Long range large-diameter, sealed tube road system |
| CN110307999A (en) * | 2019-06-28 | 2019-10-08 | 盾构及掘进技术国家重点实验室 | A kind of Roughing line experimental provision for levitated transport |
| CN110696843A (en) * | 2019-11-06 | 2020-01-17 | 中国铁路设计集团有限公司 | Pipeline section with cooling and leakage detecting functions applied to low-vacuum magnetic levitation system |
-
2020
- 2020-06-28 CN CN202010595413.4A patent/CN111811737A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107097802A (en) * | 2017-04-28 | 2017-08-29 | 北京机电工程研究所 | A kind of high reliability vacuum pipe system |
| CN108639071A (en) * | 2018-06-19 | 2018-10-12 | 成都市江泰真空镀膜科技有限公司 | Long range large-diameter, sealed tube road system |
| CN110307999A (en) * | 2019-06-28 | 2019-10-08 | 盾构及掘进技术国家重点实验室 | A kind of Roughing line experimental provision for levitated transport |
| CN110696843A (en) * | 2019-11-06 | 2020-01-17 | 中国铁路设计集团有限公司 | Pipeline section with cooling and leakage detecting functions applied to low-vacuum magnetic levitation system |
Non-Patent Citations (1)
| Title |
|---|
| 吕乾乾等: "低真空隧道结构力学行为及密封性能试验研究", 《隧道建设(中英文)》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103278380B (en) | A kind of External Pressure at High Temperature device for the full-scale evaluation of oil country tubular goods | |
| CN110307999B (en) | Low-vacuum pipeline experimental device for magnetic suspension transportation | |
| CN112857988A (en) | Asymmetric load loading test system and test method for full-scale test of pipe piece | |
| CN103575442A (en) | Method for optimizing reinforced concrete support axial force monitor data with stress-free meter | |
| CN105258828A (en) | Casing axial load testing device during the period for waiting on cement mortar setting | |
| CN106950167A (en) | Full-scale Ocean Oil And Gas Pipeline stress etching experiment method | |
| CN113418647B (en) | Floating force testing device and method for shield segment in surrounding rock | |
| CN112304790A (en) | Fatigue test method for heat supply directly-buried pipeline | |
| CN111609808A (en) | Deformation monitoring system for oil-gas pipeline of water-sealed tunnel | |
| CN110987408A (en) | Multi-ring duct piece prototype experimental device for low-vacuum tunnel | |
| CN111811737A (en) | Method for manufacturing experimental operation pipeline for low-vacuum magnetic suspension transportation | |
| CN109386298B (en) | Prefabricated tunnel steel arch with monitoring facilities | |
| CN112697300A (en) | Pipeline leakage monitoring test device and method based on distributed optical fiber temperature measurement technology | |
| CN219638838U (en) | Shield constructs section of jurisdiction interior seam measurement meter mounting structure and shield constructs section of jurisdiction subassembly | |
| CN111307658A (en) | Temperature and pressure cooperation-based mechanical composite pipe tightness auxiliary test system and method | |
| CN215492313U (en) | Pipeline leakage detection device based on carbon fiber and optical fiber composite sensor | |
| CN115541360A (en) | Device and method for simulating axial soil interaction of buried pipe in soft clay seabed | |
| CN111828039B (en) | Method for manufacturing multi-ring prototype segment for low-vacuum magnetic suspension transportation experiment tunnel | |
| CN211347356U (en) | Mechanical composite pipe tightness auxiliary test system based on warm-pressing cooperation | |
| CN112557196A (en) | Quality inspection method for underground directly-buried pipeline | |
| CN206220136U (en) | The measurement apparatus of marine wind electric field steel-pipe pile inwall and wadding weft variation contact condition | |
| CN107366313B (en) | Burying method of inclinometer pipe | |
| CN206769902U (en) | The coiled tubing logger of real-time Data Transmission is carried out by optical cable | |
| CN218645280U (en) | Leakage detection device for pipeline crossing road | |
| CN218973626U (en) | Vibration sensor protection device and vibration measurement equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20201023 |
|
| WW01 | Invention patent application withdrawn after publication |