CN114459705A - Method for detecting sealing performance of VD (vacuum degassing) seal ring of main drive of shield tunneling machine - Google Patents
Method for detecting sealing performance of VD (vacuum degassing) seal ring of main drive of shield tunneling machine Download PDFInfo
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- CN114459705A CN114459705A CN202210028461.4A CN202210028461A CN114459705A CN 114459705 A CN114459705 A CN 114459705A CN 202210028461 A CN202210028461 A CN 202210028461A CN 114459705 A CN114459705 A CN 114459705A
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- 238000007789 sealing Methods 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000005641 tunneling Effects 0.000 title claims description 16
- 238000009849 vacuum degassing Methods 0.000 title description 41
- 238000004088 simulation Methods 0.000 claims abstract description 38
- 238000005056 compaction Methods 0.000 claims description 31
- 238000005457 optimization Methods 0.000 claims description 20
- 238000004422 calculation algorithm Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 230000004044 response Effects 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000005489 elastic deformation Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 9
- 238000013461 design Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 239000004519 grease Substances 0.000 description 4
- 230000001050 lubricating effect Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 230000013011 mating Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000012417 linear regression Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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- 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
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
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Abstract
The invention discloses a method for detecting the sealing performance of a VD-shaped sealing ring driven by a shield machine owner, which comprises the following technical steps of establishing a preliminary model and inputting corresponding parameters; adding boundary conditions to the preliminary model; continuously optimizing the structure and parameters of the preliminary model by adjusting boundary conditions; and designing an optimal sealing structure according to the optimized structure and parameters. According to the invention, the initial model is established and corresponding parameters are input, the initial model is simulated by adding boundary conditions, and the structure and the parameters of the initial model are continuously optimized according to the simulation condition, so that the optimal sealing structure is designed, and the purpose of conveniently detecting and optimizing the performance of the sealing ring is achieved.
Description
Technical Field
The invention relates to the field of shield machine seal, in particular to a method for detecting the sealing performance of a VD-shaped seal ring of a shield machine main drive.
Background
The cutter head driving sealing ring of the tunnel boring machine is used as a core component of the shield machine, has decisive influence on the application efficiency of the tunnel boring machine in engineering, and is a prominent factor for the failure of a driving system of the tunnel boring machine. With the continuous development of the application of the tunnel shield machine, the application occasions of the tunnel shield machine are continuously diversified, the tunnel shield machine is widely applied to cross-river tunnels, drinking water projects and coal mining projects, and the requirement on the sealing performance of the shield machine is more and more strict in order to ensure the safety of personnel and equipment in the shield machine set.
The cutter head driving seal mainly has the important function of ensuring that the cutter head of the shield tunneling machine drives to normally work, and prevents underground water from leaking to the inside of a unit from a gap between the cutter head driving and the matching surface of a box body of the shield tunneling machine by arranging the seal ring and resisting external water pressure by using extrusion stress generated by compression deformation of the seal ring.
However, in practical application and operation processes, a driving sealing ring of a cutter head driven by the shield tunneling machine still has a fault, so that a sealing ring performance detection method is needed to realize optimal sealing condition design.
But in practice it is very difficult to measure the performance of the sealing ring with only the sensor. Therefore, a method for detecting the sealing performance of the VD-shaped sealing ring driven by the main machine of the shield machine is needed to solve the problems.
Disclosure of Invention
The invention aims to provide a method for detecting the sealing performance of a VD-shaped sealing ring driven by a shield tunneling machine main to facilitate detection and optimization of the sealing performance.
The invention is realized by the following steps:
a method for detecting sealing performance of a VD-shaped sealing ring driven by a shield machine main comprises the following technical steps:
s1, establishing a preliminary model and inputting corresponding parameters;
s2, adding boundary conditions into the preliminary model;
s3, continuously optimizing the structure and parameters of the preliminary model by adjusting boundary conditions;
and S4, designing an optimal sealing structure according to the optimized structure and parameters.
The preliminary model comprises a sealing pressing strip, a matching surface and a VD sealing ring; the sealing pressing strip is used for simulating the pre-tightening force applied to the VD sealing ring during installation.
The boundary conditions comprise a compaction amount simulation module and a front-back pressure difference simulation module; the compaction amount simulation module and the front-back pressure difference simulation module respectively adjust the compaction amount and the front-back pressure difference of the preliminary model; and the compaction quantity simulation module and the front-back pressure difference simulation module are calculated through a simulation algorithm module.
The calculation formula of the simulation algorithm module is as follows:
in the formula I1And I2Is the principal invariant of the strain tensor; c10And C01Is a material constant; m is the incompressible coefficient of the material; j is the determinant of the elastic deformation gradient.
The structure optimization method of the preliminary model comprises the following steps: and analyzing the maximum stress and the maximum pressure of the contact surface of the preliminary model through the numerical value change of the compaction amount simulation module and the front-back pressure difference simulation module so as to complete the structural optimization of the preliminary model.
The parameter optimization method of the preliminary model comprises the following steps: and analyzing the compaction quantity simulation module and the front-back pressure difference simulation module by a curved surface response method to complete parameter optimization of the primary model.
The invention has the following differences from the prior art:
according to the invention, the initial model is established and corresponding parameters are input, the initial model is simulated by adding boundary conditions, and the structure and the parameters of the initial model are continuously optimized according to the simulation condition, so that the optimal sealing structure is designed, and the purpose of conveniently detecting and optimizing the performance of the sealing ring is achieved.
Drawings
FIG. 1 is a flow chart of method steps in a method for detecting sealing performance of a VD-shaped sealing ring driven by a shield tunneling machine main in the invention;
FIG. 2 is a flow chart of a specific scheme in the method for detecting the sealing performance of the VD-shaped sealing ring driven by the shield tunneling machine main body;
FIG. 3 is a schematic diagram of a preliminary model in the method for detecting the sealing performance of the VD-shaped sealing ring driven by the shield tunneling machine owner.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to the attached drawing 1, a method for detecting the sealing performance of a VD-shaped sealing ring driven by a shield tunneling machine owner comprises the following technical steps:
s1, establishing a preliminary model and inputting corresponding parameters, wherein the preliminary model comprises a VD sealing ring, and the purpose of testing and optimizing the performance of the VD sealing ring can be achieved by improving the preliminary model;
s2, adding boundary conditions into the preliminary model, and simulating the use effect of the preliminary model in different states by adding corresponding simulation acting force to the preliminary model;
s3, continuously optimizing the structure and parameters of the preliminary model by adjusting boundary conditions, and optimizing according to the use effect of the preliminary model;
and S4, designing an optimal sealing structure according to the optimized structure and parameters.
In this embodiment, through the above steps, the preliminary model is simulated under different conditions, and the structure and parameters of the preliminary model are continuously optimized according to the simulation conditions, so as to design an optimal sealing structure, thereby achieving the purpose of facilitating the detection and optimization of the performance of the sealing ring.
The primary model further comprises a sealing pressing strip and a matching surface, the sealing pressing strip is used for simulating pre-tightening force applied to the VD sealing ring during installation, and the matching surface is used for simulating compaction amount applied to the VD sealing ring during installation.
Referring to fig. 3, specifically, the sealing strip and the mating surface can slide relative to the VD sealing ring, and the pre-tightening force and the compression amount of the VD sealing ring are adjusted according to the sliding distance between the sealing strip and the mating surface.
Referring to fig. 2 and 3, the boundary conditions include a compaction amount simulation module and a front-back pressure difference simulation module.
The compaction amount simulation module and the front-back pressure difference simulation module respectively adjust the compaction amount and the front-back pressure difference of the primary model, wherein the size of the compaction amount can be adjusted according to the relative distance between the adjustment matching surface and the VD sealing ring (namely, the matching surface is driven to slide to change the size of the compaction amount).
Further, the compaction quantity simulation module and the front-back pressure difference simulation module are calculated through a simulation algorithm module, wherein the calculation formula of the simulation algorithm module is as follows:
in the formula I1And I2Is the principal invariant of the strain tensor; c10And C01Is a material constant; m is an incompressible system of materialCounting; j is the determinant of the elastic deformation gradient.
The structure optimization method of the preliminary model comprises the following steps: and analyzing the maximum stress and the maximum pressure of the contact surface of the preliminary model through the numerical value change of the compaction amount simulation module and the front-back pressure difference simulation module so as to complete the structural optimization of the preliminary model.
Specifically, the displacement of the sealing bead is controlled to maintain the pretightening force when the VD sealing ring is installed unchanged, and the front-back pressure difference is made to be zero (i.e. the acting forces in the directions indicated by the two arrows in fig. 3 are equal and opposite), and then the magnitude of the compaction amount is controlled (i.e. the relative distance between the mating surface and the bottom of the VD sealing ring is controlled, as indicated by d in fig. 3).
Because the pressure concentration is mainly positioned at two parts, one part is positioned at the root of the tooth form of the VD seal ring, which is the bending concentrated stress generated at the root of the tooth form of the seal ring due to the interference fit of the VD seal ring and a matching surface, and meanwhile, under the pressure action of lubricating grease, the stress concentrated area at the root of the VD seal ring is deviated, and the tensile stress at the root of the VD seal ring is obviously intensified;
another pressure concentration area exists in a contact area with the top of the VD seal ring, which is mainly caused by the loading of the pressure of the lubricating grease, so that the Hertzian contact stress near the contact surface of the VD seal ring is obviously increased, and further deformation is generated.
The structure can be deformed under different compaction amounts, and after the structure is further changed, the pressure concentration can be influenced, so that the pressure concentration part can be judged according to the changed compaction amount (the FEM analysis module in the prior art can be adopted for analysis and judgment), and the position where the VD sealing ring is to be reinforced can be judged, namely the optimization of the VD sealing ring structure is completed.
Furthermore, when the compression amount of the VD sealing ring is gradually reduced, the sealing reliability of the VD sealing ring cannot be guaranteed due to heat generation and abrasion during operation, and the turnover phenomenon is easy to generate;
however, when the compaction amount is gradually increased, the turning possibility of the VD seal ring is lower, but the maximum contact pressure of the contact surface of the VD seal ring is in a descending trend, the contact area is further increased, and the sealing effect is also affected;
therefore, the displacement of the matching surface needs to be continuously increased (namely, the compaction amount needs to be continuously increased), the contact area between the VD sealing ring and the matching surface is also continuously increased, and the maximum stress value borne by the sealing ring is also continuously reduced at the moment, so that the VD sealing ring is prevented from being broken. Therefore, the amount of compaction needs to be ensured within a proper range to ensure the sealing effect.
Because the media in contact with the front and back surfaces of the VD sealing ring are generally different (i.e., slurry pressure or lubricating grease pressure of a previous stage is applied to the front loading surface, and a slightly lower pressure of different media in the lubricating grease pressure is applied to the back loading surface), the different media apply different pressures to the VD sealing ring, and the size of the front-back surface pressure difference also affects the sealing effect of the VD sealing ring.
In order to conveniently research the sealing effect of the VD sealing ring under the condition of different front and back pressure differences, further, in actual work, the front and back pressure differences of the VD sealing ring fluctuate, so that when the condition of simulating the pressure difference change is required, the pressure difference is changed by controlling other conditions to be unchanged, the sealing effect of the VD sealing ring under the condition of pressure difference change is observed, and the structure of the VD sealing ring can be optimized according to the detection effect.
Specifically, along with the positive and negative pressure difference constantly increases, VD sealing washer contact surface maximum pressure also keeps close range rising, makes contact surface maximum pressure not break through the limit earlier and arouses sealed the revealing, and the stability of seal structure sealing effect is guaranteed to the continuous increase of rethread VD sealing washer contact surface maximum pressure to this accomplishes the optimization of VD sealing washer structure.
In summary, the maximum stress and the maximum contact surface pressure of the preliminary model are analyzed by changing the values of the compaction amount simulation module and the front-back pressure difference simulation module respectively, so as to complete the structural optimization of the preliminary model.
The parameter optimization method of the preliminary model comprises the following steps: and analyzing the compaction quantity simulation module and the front-back pressure difference simulation module by a curved surface response method to complete parameter optimization of the primary model.
The response surface method is also called regression design, the optimal combination of the levels of all factors is found by searching the quantitative rule between the experimental index and each factor, and data is actively collected on the contact of the multiple linear regression so as to obtain a regression equation with better properties. And optimizing the structure and parameters by combining with actual working conditions, and designing the optimal sealing design of the VD sealing ring.
Therefore, the optimal numerical value (namely the optimal parameter of the preliminary model) can be found according to the continuous matching of the compaction quantity simulation module and the front-back pressure difference simulation module, so that the parameter optimization of the preliminary model is completed.
In summary, the invention analyzes the maximum stress and the maximum pressure of the contact surface of the preliminary model by respectively carrying out the compaction amount test and the front-back pressure difference test on the preliminary model so as to complete the structural optimization of the preliminary model, and then analyzes by the curved surface response method so as to complete the parameter optimization of the preliminary model.
In addition, the invention can also be used for detecting the sealing performance of the VD sealing ring under different compaction amounts; the device can be used for detecting the sealing performance of the sealing ring under the same pressure difference and different medium pressures; the maximum stress of the sealing ring can be detected, and the maximum pressure of the contact surface of the sealing ring can be detected; the method can be used for designing the optimal sealing working condition.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A method for detecting sealing performance of a VD-shaped sealing ring of a main drive of a shield tunneling machine is characterized by comprising the following steps: the method comprises the following technical steps:
s1, establishing a preliminary model and inputting corresponding parameters;
s2, adding boundary conditions into the preliminary model;
s3, continuously optimizing the structure and parameters of the preliminary model by adjusting boundary conditions;
and S4, designing an optimal sealing structure according to the optimized structure and parameters.
2. The method for detecting the sealing performance of the VD-shaped sealing ring driven by the shield tunneling machine according to claim 1 is characterized in that: the preliminary model comprises a sealing pressing strip, a matching surface and a VD sealing ring;
the sealing pressing strip is used for simulating the pre-tightening force applied to the VD sealing ring during installation.
3. The method for detecting the sealing performance of the VD-shaped sealing ring driven by the shield tunneling machine according to claim 1 is characterized in that: the boundary conditions comprise a compaction amount simulation module and a front-back pressure difference simulation module;
the compaction amount simulation module and the front-back pressure difference simulation module respectively adjust the compaction amount and the front-back pressure difference of the preliminary model;
and the compaction quantity simulation module and the front-back pressure difference simulation module are calculated through a simulation algorithm module.
4. The method for detecting the sealing performance of the VD-shaped sealing ring driven by the shield tunneling machine according to claim 3, is characterized in that: the calculation formula of the simulation algorithm module is as follows:
in the formula I1And I2Is the principal invariant of the strain tensor; c10And C01Is a material constant; m is the incompressible coefficient of the material; j is the determinant of the elastic deformation gradient.
5. The method for detecting the sealing performance of the VD-shaped sealing ring driven by the shield tunneling machine according to claim 3, is characterized in that: the structure optimization method of the preliminary model comprises the following steps: and analyzing the maximum stress and the maximum pressure of the contact surface of the preliminary model through the numerical value change of the compaction amount simulation module and the front-back pressure difference simulation module so as to complete the structural optimization of the preliminary model.
6. The method for detecting the sealing performance of the VD-shaped sealing ring driven by the shield tunneling machine according to claim 3, is characterized in that: the parameter optimization method of the preliminary model comprises the following steps: and analyzing the compaction quantity simulation module and the front-back pressure difference simulation module by a curved surface response method to complete parameter optimization of the primary model.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107292056A (en) * | 2017-07-21 | 2017-10-24 | 山东省科学院海洋仪器仪表研究所 | A kind of O-ring seals fast design method based on Finite Element Simulation Analysis |
| CN110232247A (en) * | 2019-06-14 | 2019-09-13 | 哈工大机器人（合肥）国际创新研究院 | A kind of optimum design method of the valve sealing ring based on finite element analysis |
| CN113361039A (en) * | 2021-06-17 | 2021-09-07 | 中铁第四勘察设计院集团有限公司 | Section optimization method and system for sealing gasket of shield tunnel segment joint |
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- 2022-01-11 CN CN202210028461.4A patent/CN114459705A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107292056A (en) * | 2017-07-21 | 2017-10-24 | 山东省科学院海洋仪器仪表研究所 | A kind of O-ring seals fast design method based on Finite Element Simulation Analysis |
| CN110232247A (en) * | 2019-06-14 | 2019-09-13 | 哈工大机器人（合肥）国际创新研究院 | A kind of optimum design method of the valve sealing ring based on finite element analysis |
| CN113361039A (en) * | 2021-06-17 | 2021-09-07 | 中铁第四勘察设计院集团有限公司 | Section optimization method and system for sealing gasket of shield tunnel segment joint |
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| Title |
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