Dedicated measuring instrument for shield grease water-resistant sealing and test method thereof

A technology of measuring instrument and test method, applied in the field of lubricating grease, can solve the problems of large test error, unsatisfactory, complicated operation, etc., achieve the effect of small test error, ensure uninterrupted operation, and reduce operation difficulty

Active Publication Date: 2019-06-14
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing tube-easy test device has many structural defects, and the operation is complicated, the test error is large, and the adaptability is poor.
The existing test methods for shield oil water resistance and sealing performance cannot meet the actual needs of today's shield tunneling industry in terms of the standardization and uniformity of the test methods, as well as the accuracy and reproducibility of the test results.

Method used

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  • Dedicated measuring instrument for shield grease water-resistant sealing and test method thereof
  • Dedicated measuring instrument for shield grease water-resistant sealing and test method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Place two layers of 20-mesh test sieve plates on the bottom of the test cylinder, fix the lower sealing cover, and then weigh 102g of commercially available shield tail sealant A into the test cylinder. The sample was compacted with a 20-mesh flattened sieve. Inject 102g of pure water into the test cylinder. Fix the sealing cover and install the sealing joint.

[0032] The high-pressure nitrogen gas source was set to provide a pressure of 4.5 MPa. Adjust the pressure regulating valve of pipeline A to make the pressure of the pressure transmitter of pipeline A reach 0.5MPa. The switch solenoid valve of pipeline A is energized to open, and the switch solenoid valve of pipeline B is in a power-off state at this time. Set the test time to 300s, and start the first constant pressure test. Before the end of the first test, the pressure of pipeline B is set to 1.0MPa. After the first constant pressure test is over, the switch solenoid valve of pipeline A is closed, and th...

Embodiment 2

[0037] Place a layer of 200-mesh test sieve plate at the bottom of the test cylinder, fix the lower sealing cover, and then weigh 100g of commercially available main bearing sealant grease A into the test cylinder. The sample was compacted with a 200-mesh flattened sieve. Inject 100g of pure water into the test cylinder. Fix the sealing cover and install the sealing joint.

[0038] Set the high-pressure air source to provide a pressure of 4.0 MPa. Adjust the pressure regulating valve of pipeline A to make the pressure of the pressure transmitter of pipeline A reach 0.5MPa. The switch solenoid valve of pipeline A is energized to open, and the switch solenoid valve of pipeline B is in a power-off state at this time. Set the test time to 60s, and start the first constant pressure test. Before the end of the first test, the pressure of pipeline B is set to 1.0MPa. After the first constant pressure test is over, the switch solenoid valve of pipeline A is closed, and the switch...

Embodiment 3

[0043] Place two layers of 30-mesh test sieve plates on the bottom of the test cylinder, fix the lower sealing cover, and then weigh 98g of commercially available shield tail sealant B into the test cylinder. The sample was compacted with a 30-mesh flattened sieve. Inject 98g of pure water into the test cylinder. Fix the sealing cover and install the sealing joint.

[0044] The high-pressure nitrogen gas source was set to provide a pressure of 5.0 MPa. Adjust the pressure regulating valve of pipeline A to make the pressure of the pressure transmitter of pipeline A reach 0.5MPa. The switch solenoid valve of pipeline A is energized to open, and the switch solenoid valve of pipeline B is in a power-off state at this time. Set the test time to 240s, and start the first constant pressure test. Before the end of the first test, the pressure of pipeline B is set to 1.0MPa. After the first constant pressure test is over, the switch solenoid valve of pipeline A is closed, and the ...

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Abstract

The invention relates a dedicated measuring instrument for shield grease water-resistant sealing and a test method thereof. The measuring instrument is mainly composed of a high-pressure gas source, aparallel-connected two-path pressurizing control device, a test tube and a pressure release valve; the two-path pressurizing control device is connected with the test tube by means of the high-pressure pipeline; a testing sieve plate is arranged at the bottom of a test tube main body. The test method comprises the following steps: placing the testing sieve plate in the test tube and injecting into shield grease, and injecting water into an upper part of the grease; pressurizing the test tube through the two-path pressurizing control system, and retaining for a certain time under the stipulated pressure; observing whether water seeps from the testing sieve plate at the bottom of the test tube, and recording the grease leakage rate. Through the tester and test method disclosed by the invention, the water-resistant sealing performance of the shield grease can be effectively reflected by stimulating a working condition of the shield grease in the shield construction under the high-pressure water environment.

Description

technical field [0001] The invention belongs to the technical field of lubricating grease, and in particular relates to a measuring instrument and a test method specially used for investigating the water-resistant and sealing performance of shield machine grease in a high-pressure water environment. Background technique [0002] Shield tunneling is currently the main method of tunnel construction in urban rail transit construction. In shield construction, the shield tail sealant and main bearing sealant used are collectively called shield grease. Shield grease plays an important role in preventing the infiltration of mud and water, improving the sealing effect of the cutter head, reducing the friction of related components, ensuring construction safety, and improving tunneling efficiency. [0003] Water resistance is a very key index to evaluate the technical performance of shield grease. However, at present, no special measuring instrument has been developed for the measu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/02
Inventor 王先会刘洪鹏张军崔骁良刘坤张文立王春彬吴立红
Owner CHINA PETROLEUM & CHEM CORP
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