CN112161796A - High-speed train transmission gear box body strength test method - Google Patents
High-speed train transmission gear box body strength test method Download PDFInfo
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/06—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool
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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
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- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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Abstract
The invention discloses a method for testing the strength of a transmission gear box body of a high-speed train, which comprises the following steps: s1, testing and detecting the load of the gearbox, namely installing a ferrule on the outer ring of a bearing in the gearbox body of the gearbox, adhering a strain sensor and an acceleration sensor, and recording detection data through the operation of the gearbox to obtain data of the dynamic load of a reducer and a gear of the gearbox; according to the invention, a ferrule is arranged on an outer ring of a bearing in a gearbox body, a strain sensor and an acceleration sensor are adhered, a speed measuring sensor is arranged in the gearbox body or a vibration acceleration sensor is used, a load test is started, operation data is obtained according to the strain sensor and the acceleration sensor, the data is convenient for fatigue degree simulation analysis of the gearbox, then, the tightness is detected, corrosion detection and tensile strength detection are carried out, ultrasonic waves in an ultrasonic flaw detector penetrate into a welding position or a metal material of the gearbox body, and the material and the welding position of the gearbox body are detected to have no defects.
Description
Technical Field
The invention relates to the technical field of gearbox testing, in particular to a method for testing the strength of a transmission gearbox body of a high-speed train.
Background
As is well known, a gear box of a high-speed train has a wide application range, wherein the gear box of the high-speed train consists of a gear, a box body, a bearing, a lubricating mechanism and the like, is a power transmission device of the high-speed train, is responsible for transmitting the power of a motor to the train, is one of core components of the train, and generally speaking, the gear with the linear velocity exceeding 25 meters per second can be called as the high-speed gear box; when the speed per hour of the train is increased from 200 kilometers to 380 kilometers, the linear speed of the driven gear is increased from 35 meters per second to 70 meters per second; the high rotating speed provides great challenges for the performance of the gears, the meshing between the gears, the reliable sealing of the box body and the like, the rotating speed required by the power generation of the generator can not be reached, and the high rotating speed is realized by the speed increasing action of a gear pair of the gear box, so the gear box is also called as a speed increasing box; the existing gear box is single in detection flow, and meanwhile, the gear box is not provided with a unified detection standard after being produced, so that detection personnel can use a plurality of detection devices or detection means with different standards when detecting materials.
Disclosure of Invention
The invention aims to provide a method for testing the strength of a transmission gearbox body of a high-speed train, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for testing the strength of a box body of a transmission gearbox of a high-speed train comprises the following steps:
s1, testing and detecting the load of the gearbox, namely installing a ferrule on the outer ring of a bearing in the gearbox body, adhering a strain sensor and an acceleration sensor, recording the detected data through the operation of the gearbox, obtaining the data of the dynamic load of a reducer and a gear of the gearbox, and carrying out the next step;
s2, detecting the tightness of the gear box, sealing the box body by a sealing plate or a cover body, and then carrying out vacuum pumping test by using a vacuum pump, wherein the pressure of a gas source of a vacuum meter is 0.5-0.7 MPa, and carrying out the next step;
s3, gear box corrosion resistance detection, adopting 5% sodium chloride aqueous solution, the test temperature is 35 ℃, the sedimentation rate of salt fog is 1-2ml/80cm2H, carrying out spray detection on the surface of the box body, and carrying out the next step after detection;
s4, detecting the tensile strength of the gear box, namely, detecting the tensile strength of the gear box by using a tensile strength tester, carrying out incremental detection on the tensile strength value of the gear box from 0MPa to 550MPa, and carrying out the next step after detection;
and S5, ultrasonic flaw detection, wherein ultrasonic penetrability penetrates into the welding position of the box body or the deep part of the metal material to detect and analyze the metal material, if a defect wave is displayed by an instrument in the material detection, the material has a defect, and if the defect wave is displayed by a detection instrument when the welding position is scanned in a zigzag manner, the welding position has a defect.
Preferably: in S1, the test data of the strain sensor is judged, the sensor changes the measurement data along with the change rule of the gear box load test, a stress spectrum is compiled according to the data, meanwhile, a vibration acceleration sensor and a dynamic signal analyzer can be added for detecting the vibration performance, the sensor is responsible for sensing the vibration and converting the physical quantity into an electric signal to be output, and the dynamic signal analyzer is responsible for acquiring and analyzing the signal.
Preferably: in S2, the next step is carried out after the air source pressure of the vacuum gauge is between 0.5MPa and 0.7MPa is kept for 5 to 10 min.
Preferably: in S2, after the vacuum test, the container to be tested is immersed in water by a water immersion method, and the presence or absence of air bubbles and the amount of air bubbles are observed to determine the sealing property of the container.
Preferably: in S3, the pH of the solution for corrosion detection is adjusted to a neutral range of 6 to 7 for 48 to 72 hours as a solution for spraying.
Preferably: in S4, the tensile strength exceeding 250MPa is a passing value in the table of values observed while the strength is increased by the tensile test.
Preferably: when the corrosion resistance of the gearbox is detected, the spraying duration is about 4-8 years of corrosion degree of normal use of the external environment within 48-72h, and the corrosion resistance is good if the surface oxidation degree or damage degree of the gearbox is low.
Preferably: and (5) observing the elongation of the gear box after the tensile test after the tensile strength of the gear box is detected.
Preferably: the corrosion resistance detection of the gearbox can be replaced by an acetate spray test or a copper salt accelerated acetate spray test.
Compared with the prior art, the invention has the beneficial effects that: according to the method, a ferrule is arranged on an outer ring of a bearing in a gearbox body, a strain sensor and an acceleration sensor are adhered, a speed measuring sensor is arranged in the gearbox body or a vibration acceleration sensor is used, a load test is started, operation data are obtained according to the strain sensor and the acceleration sensor, the data are convenient for fatigue degree simulation analysis of the gearbox, the intensity of the gearbox body under different operation environments is analyzed, then, the tightness is detected, corrosion detection and tensile strength detection are carried out, the corrosion resistance and tensile deformation strength of the gearbox body are detected, finally, ultrasonic flaw detection is carried out, the box body is detected and analyzed by penetrating into the welding position of the gearbox body or the deep position of a metal material through ultrasonic wave penetrability, the detection of the material and the welding position of the box body is flawless, the method is detailed in detection, the process.
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FIG. 1 is a flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The invention provides a method for testing the strength of a box body of a transmission gearbox of a high-speed train, which comprises the following steps of:
s1, testing and detecting the load of the gearbox, namely installing a ferrule on the outer ring of a bearing in the gearbox body, adhering a strain sensor and an acceleration sensor, recording the detected data through the operation of the gearbox, obtaining the data of the dynamic load of a reducer and a gear of the gearbox, and carrying out the next step;
s2, detecting the tightness of the gear box, sealing the box body by a sealing plate or a cover body, and then carrying out vacuum pumping test by using a vacuum pump, wherein the pressure of a gas source of a vacuum meter is 0.6MPa, and carrying out the next step;
s3, gear box corrosion resistance detection, adopting 5% sodium chloride aqueous solution, the test temperature is 35 ℃, the sedimentation rate of salt fog is 1.5ml/80cm2H, carrying out spray detection on the surface of the box body, and carrying out the next step after detection;
s4, detecting the tensile strength of the gear box by using a tensile strength tester, wherein the tensile strength numerical value is 300MPa, and performing the next step after detection;
and S5, ultrasonic flaw detection, wherein ultrasonic penetrability penetrates into the welding position of the box body or the deep part of the metal material to detect and analyze the metal material, if a defect wave is displayed by an instrument in the material detection, the material has a defect, and if the defect wave is displayed by a detection instrument when the welding position is scanned in a zigzag manner, the welding position has a defect.
The invention specifically comprises the following steps: in S1, the test data of the strain sensor is judged, the sensor changes the measurement data along with the change rule of the gear box load test, a stress spectrum is compiled according to the data, meanwhile, a vibration acceleration sensor and a dynamic signal analyzer can be added for detecting the vibration performance, the sensor is responsible for sensing the vibration and converting the physical quantity into an electric signal to be output, and the dynamic signal analyzer is responsible for acquiring and analyzing the signal.
By adopting the scheme, the judgment is carried out according to the test data of the strain sensor, the sensor changes the metering data along with the change rule of the load test of the gearbox, the stress spectrum is compiled according to the data, the vibration acceleration sensor can be used for analyzing the vibration characteristics of the box body in the time domain and the frequency domain, and the data acquisition information is obtained according to the signals acquired by the analyzer so as to analyze the fatigue data of the gear subjected to the load which is changed periodically or irregularly along with the time.
The invention specifically comprises the following steps: in S2, the next step is performed after the vacuum gauge gas source pressure is 0.6MPa and the holding time is 8 min.
By adopting the scheme, the vacuum pump is used for pumping out air in the gear box, so that the value of a vacuum meter is 0.6MPa, the vacuum meter is kept for 8min, and the tightness of the gear box can be observed conveniently.
The invention specifically comprises the following steps: in S2, after the vacuum test, the container to be tested is immersed in water by a water immersion method, and the presence or absence of air bubbles and the amount of air bubbles are observed to determine the sealing property of the container.
By adopting the scheme, the tightness of the gear box can be observed by soaking the gear box in water, and the tightness is poor if bubbles exist.
The invention specifically comprises the following steps: in S3, the PH of the solution for corrosion detection was adjusted to the neutral range of 6.5 as a solution for spraying and continued for 60 hours.
By adopting the scheme, the gear box is continuously sprayed by salt mist, and the continuous operation for 60h is carried out, so that the corrosion resistance of the gear box is conveniently detected.
By adopting the scheme, the temperature amplitude of the rolling bearing in the gear box and the temperature after continuous operation are detected through operation, so that the detection of the gear operation of the gear box is convenient to observe.
The invention specifically comprises the following steps: in S4, the tensile strength exceeding 300MPa is a passing value, as the table of values observed while the strength is increased by the tensile test.
By adopting the scheme, the tensile data is observed, so that the tensile degree of the gear box can be conveniently recorded, and the quality of the gear box is ensured.
The invention specifically comprises the following steps: when the corrosion resistance of the gearbox is detected, the spraying duration time of 60h is about the corrosion degree of the external environment in normal use for 6 years, and if the surface oxidation degree of the gearbox is low or the damage degree is low, the corrosion resistance is good.
By adopting the scheme, the spraying duration time of 60h is about the corrosion degree of the external environment in normal use for 6 years, and the corrosion resistance of the gearbox can be conveniently recorded by detection personnel.
The invention specifically comprises the following steps: and (5) observing the elongation of the gear box after the tensile test after the tensile strength of the gear box is detected.
By adopting the scheme, the deformation rate and the extensibility of the gearbox can be recorded by observing and recording the extensibility, and the quality in use is ensured.
The invention specifically comprises the following steps: the corrosion resistance detection of the gearbox can be replaced by an acetate spray test or a copper salt accelerated acetate spray test.
By adopting the scheme, the detection of salt spray can be replaced by acetate spray test or copper salt accelerated acetate spray test.
The working principle is as follows: firstly, testing and detecting the load of a gear box, installing an acceleration sensor, installing a speed sensor inside the gear box, recording detection data through the operation of the gear box to obtain load carrying data of the gear box, sealing the gear box by using a sealing plate or a cover body, then carrying out vacuum pumping test by using a vacuum pump, wherein the pressure of a gas source on a vacuum meter is 0.6MPa, then carrying out corrosion resistance detection, adopting 5% sodium chloride aqueous solution, the test temperature is 35 ℃, and the settlement rate of salt spray is 1.5ml/80cm2H, spraying detection is carried out on the surface of the box body, spraying lasts for 60h, a tensile strength testing machine is adopted for carrying out tensile strength detection on the gear box, the tensile strength value is 300MPa, the tensile test is passed through, the strength is gradually increased, meanwhile, a numerical table is observed, the tensile strength value exceeds 300MPa, the tensile strength value is a qualified value, finally, ultrasonic flaw detection is carried out, the ultrasonic penetrability is utilized to penetrate into the welding position of the box body or the deep part of a metal material, and the detection box body is free of defects in material and the welding position.
Example two
The invention provides a method for testing the strength of a box body of a transmission gearbox of a high-speed train, which comprises the following steps of:
s1, testing and detecting the load of the gearbox, namely installing a ferrule on the outer ring of a bearing in the gearbox body, adhering a strain sensor and an acceleration sensor, recording the detected data through the operation of the gearbox, obtaining the data of the dynamic load of a reducer and a gear of the gearbox, and carrying out the next step;
s2, detecting the tightness of the gear box, sealing the box body by a sealing plate or a cover body, and then carrying out vacuum pumping test by using a vacuum pump, wherein when the air source pressure of a vacuum meter is 0.5MPa, the next step is carried out;
s3, performing corrosion resistance detection on the gear box, namely adopting 5% sodium chloride aqueous solution, wherein the test temperature is 35 ℃, and the settlement rate of salt mist is 1/80cm2H, carrying out spray detection on the surface of the box body, and carrying out the next step after detection;
s4, carrying out gear box tensile strength detection, wherein a tensile strength tester is adopted to carry out the tensile strength detection on the gear box, the tensile strength value is 220MPa, and the next step is carried out after the detection;
and S5, ultrasonic flaw detection, wherein ultrasonic penetrability penetrates into the welding position of the box body or the deep part of the metal material to detect and analyze the metal material, if a defect wave is displayed by an instrument in the material detection, the material has a defect, and if the defect wave is displayed by a detection instrument when the welding position is scanned in a zigzag manner, the welding position has a defect.
The invention specifically comprises the following steps: in S1, the test data of the strain sensor is judged, the sensor changes the measurement data along with the change rule of the gear box load test, a stress spectrum is compiled according to the data, meanwhile, a vibration acceleration sensor and a dynamic signal analyzer can be added for detecting the vibration performance, the sensor is responsible for sensing the vibration and converting the physical quantity into an electric signal to be output, and the dynamic signal analyzer is responsible for acquiring and analyzing the signal.
By adopting the scheme, the judgment is carried out according to the test data of the strain sensor, the sensor changes the metering data along with the change rule of the load test of the gearbox, the stress spectrum is compiled according to the data, the vibration acceleration sensor can be used for analyzing the vibration characteristics of the box body in the time domain and the frequency domain, and the data acquisition information is obtained according to the signals acquired by the analyzer so as to analyze the fatigue data of the gear subjected to the load which is changed periodically or irregularly along with the time.
The invention specifically comprises the following steps: in S2, the next step was performed after the vacuum gauge gas source pressure was maintained at 0.5MPa for 5 min.
By adopting the scheme, the vacuum pump is used for pumping out air in the gear box, so that the value of a vacuum meter is 0.5MPa, the vacuum meter is kept for 10min, and the tightness of the gear box can be observed conveniently.
The invention specifically comprises the following steps: in S2, after the vacuum test, the container to be tested is immersed in water by a water immersion method, and the presence or absence of air bubbles and the amount of air bubbles are observed to determine the sealing property of the container.
By adopting the scheme, the tightness of the gear box can be observed by soaking the gear box in water, and the tightness is poor if bubbles exist.
The invention specifically comprises the following steps: in S3, the PH of the corrosion detection solution was adjusted to the neutral range of 6 as a solution for spraying and continued for 48 hours.
By adopting the scheme, the gear box is continuously sprayed by the salt fog, and the continuous operation of 48 is carried out, so that the corrosion resistance of the gear box is conveniently detected.
By adopting the scheme, the temperature amplitude of the rolling bearing in the gear box and the temperature after continuous operation are detected through operation, so that the detection of the gear operation of the gear box is convenient to observe.
The invention specifically comprises the following steps: in S4, the tensile strength exceeding 220MPa is a passing value, as the table of values observed while the strength is increased by the tensile test.
By adopting the scheme, the tensile data is observed, so that the tensile degree of the gear box can be conveniently recorded, and the quality of the gear box is ensured.
The invention specifically comprises the following steps: when the corrosion resistance of the gearbox is detected, the spraying duration time of 48h is about the corrosion degree of 4 years of normal use of the external environment, and the corrosion resistance is good if the oxidation degree of the surface of the gearbox is low or the damage degree is low.
By adopting the scheme, the spraying duration time of 48h is about the corrosion degree of the external environment in normal use for 4 years, and the corrosion resistance of the gearbox can be conveniently recorded by detection personnel.
The invention specifically comprises the following steps: and (5) observing the elongation of the gear box after the tensile test after the tensile strength of the gear box is detected.
By adopting the scheme, the deformation rate and the extensibility of the gearbox can be recorded by observing and recording the extensibility, and the quality in use is ensured.
The invention specifically comprises the following steps: the corrosion resistance detection of the gearbox can be replaced by an acetate spray test or a copper salt accelerated acetate spray test.
By adopting the scheme, the detection of salt spray can be replaced by acetate spray test or copper salt accelerated acetate spray test.
The working principle is as follows: firstly, testing and detecting the load of a gear box, installing an acceleration sensor, installing a speed sensor inside the gear box, recording detection data through the operation of the gear box to obtain load carrying data of the gear box, sealing the gear box by using a sealing plate or a cover body, then carrying out vacuum pumping test by using a vacuum pump, wherein the pressure of a gas source on a vacuum meter is 0.5MPa, then carrying out corrosion resistance detection, adopting 5% sodium chloride aqueous solution, the test temperature is 35 ℃, and the settlement rate of salt spray is 1/80cm2H, spraying detection is carried out on the surface of the box body, spraying lasts for 48h, a tensile strength testing machine is adopted for carrying out tensile strength detection on the gear box, the tensile strength value is 220MPa, through tensile testing, the strength is gradually increased while a numerical table is observed, the tensile strength value exceeds 220MPa and is a qualified value, finally, through ultrasonic flaw detection, detection and analysis are carried out on the welded position or the metal material by utilizing the penetration of ultrasonic wave penetrating property into the welded position of the box body, and the detected box body is flawless in material and the welded position.
EXAMPLE III
The invention provides a method for testing the strength of a box body of a transmission gearbox of a high-speed train, which comprises the following steps of:
s1, testing and detecting the load of the gearbox, namely installing a ferrule on the outer ring of a bearing in the gearbox body, adhering a strain sensor and an acceleration sensor, recording the detected data through the operation of the gearbox, obtaining the data of the dynamic load of a reducer and a gear of the gearbox, and carrying out the next step;
s2, detecting the tightness of the gear box, sealing the box body by a sealing plate or a cover body, and then carrying out vacuum pumping test by using a vacuum pump, wherein the pressure of a gas source of a vacuum meter is 0.7MPa, and carrying out the next step;
s3, gear box corrosion resistance detection, adopting 5% sodium chloride aqueous solution, the test temperature is 35 ℃, the settlement rate of salt fog is 2ml/80cm2H, carrying out spray detection on the surface of the box body, and carrying out the next step after detection;
s4, detecting the tensile strength of the gear box, namely, detecting the tensile strength of the gear box by using a tensile strength tester, carrying out incremental detection on the tensile strength value of the gear box from 450MPa, and carrying out the next step after detection;
and S5, ultrasonic flaw detection, wherein ultrasonic penetrability penetrates into the welding position of the box body or the deep part of the metal material to detect and analyze the metal material, if a defect wave is displayed by an instrument in the material detection, the material has a defect, and if the defect wave is displayed by a detection instrument when the welding position is scanned in a zigzag manner, the welding position has a defect.
In the invention, in S1, the test data of the strain gauge sensor is judged, the sensor changes the measurement data along with the change rule of the gear box load test, and the stress spectrum is compiled according to the data, meanwhile, a vibration acceleration sensor and a dynamic signal analyzer can be added for detecting the vibration performance, the sensor is responsible for sensing the vibration and converting the physical quantity into the electric signal to be output, and the dynamic signal analyzer is responsible for acquiring and analyzing the signal.
By adopting the scheme, the judgment is carried out according to the test data of the strain sensor, the sensor changes the metering data along with the change rule of the load test of the gearbox, the stress spectrum is compiled according to the data, the vibration acceleration sensor can be used for analyzing the vibration characteristics of the box body in the time domain and the frequency domain, and the data acquisition information is obtained according to the signals acquired by the analyzer so as to analyze the fatigue data of the gear subjected to the load which is changed periodically or irregularly along with the time.
The invention specifically comprises the following steps: in S2, the next step is performed after the vacuum gauge gas source pressure is 0.7MPa and the holding time is 10 min.
By adopting the scheme, the vacuum pump is used for pumping out air in the gear box, so that the value of a vacuum meter is 0.7MPa, the vacuum meter is kept for 10min, and the tightness of the gear box can be observed conveniently.
The invention specifically comprises the following steps: in S2, after the vacuum test, the container to be tested is immersed in water by a water immersion method, and the presence or absence of air bubbles and the amount of air bubbles are observed to determine the sealing property of the container.
By adopting the scheme, the tightness of the gear box can be observed by soaking the gear box in water, and the tightness is poor if bubbles exist.
The invention specifically comprises the following steps: in S3, the PH of the corrosion detection solution was adjusted to the neutral range of 7 as a solution for spraying for 72 hours.
Through adopting above-mentioned scheme, continuously spray its gear box through salt fog to carry out 72 h's continuation operation, be convenient for carry out anticorrosive detection to the gear box.
By adopting the scheme, the temperature amplitude of the rolling bearing in the gear box and the temperature after continuous operation are detected through operation, so that the detection of the gear operation of the gear box is convenient to observe.
The invention specifically comprises the following steps: in S4, the tensile strength exceeding 450MPa is a passing value in the table of values observed while the strength is increased by the tensile test.
By adopting the scheme, the tensile data is observed, so that the tensile degree of the gear box can be conveniently recorded, and the quality of the gear box is ensured.
The invention specifically comprises the following steps: when the corrosion resistance of the gearbox is detected, the spraying duration 72h is about the corrosion degree of 8 years of normal use of the external environment, and the corrosion resistance is good if the oxidation degree of the surface of the gearbox is low or the damage degree is low.
By adopting the scheme, the spraying duration time of 72h is about the corrosion degree of the external environment in normal use for 8 years, and the corrosion resistance of the gearbox can be conveniently recorded by detection personnel.
The invention specifically comprises the following steps: and (5) observing the elongation of the gear box after the tensile test after the tensile strength of the gear box is detected.
By adopting the scheme, the deformation rate and the extensibility of the gearbox can be recorded by observing and recording the extensibility, and the quality in use is ensured.
The invention specifically comprises the following steps: the corrosion resistance detection of the gearbox can be replaced by an acetate spray test or a copper salt accelerated acetate spray test.
By adopting the scheme, the detection of salt spray can be replaced by acetate spray test or copper salt accelerated acetate spray test.
The working principle is as follows: firstly, testing and detecting the load of a gear box, mounting a ferrule on the outer ring of a bearing in the box body of the gear box, adhering a strain sensor and an acceleration sensor, recording detection data through the operation of the gear box to obtain the data of the dynamic load of a speed reducer and a gear of the gear box, sealing the data by using a sealing plate or a cover body, then performing vacuum pumping test by using a vacuum pump, wherein the pressure of a gas source of a vacuum meter is 0.7MPa, then performing corrosion resistance detection, adopting 5% sodium chloride aqueous solution, the test temperature is 35 ℃, and the settlement rate of salt mist is 2ml/80cm2H, spraying detection is carried out on the surface of the box body, spraying lasts for 72h, a tensile strength testing machine is adopted for carrying out tensile strength detection on the gear box, the tensile strength value is progressively increased from 450MPa, through the tensile test, the strength is progressively increased while a numerical table is observed, the tensile strength value exceeds 450MPa and is a qualified value, finally, through ultrasonic flaw detection, the ultrasonic wave penetrates into the deep position of the welding position of the penetrable box body or the metal material to carry out detection and analysis, and the material and the welding position of the detection box body are flawless.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A method for testing the strength of a box body of a transmission gearbox of a high-speed train is characterized by comprising the following steps:
s1, testing and detecting the load of the gearbox, namely installing a ferrule on the outer ring of a bearing in the gearbox body, adhering a strain sensor and an acceleration sensor, recording the detected data through the operation of the gearbox, obtaining the data of the dynamic load of a reducer and a gear of the gearbox, and carrying out the next step;
s2, detecting the tightness of the gear box, sealing the box body by a sealing plate or a cover body, and then carrying out vacuum pumping test by using a vacuum pump, wherein the pressure of a gas source of a vacuum meter is 0.5-0.7 MPa, and carrying out the next step;
s3, gear box corrosion resistance detection, adopting 5% sodium chloride aqueous solution, the test temperature is 35 ℃, the sedimentation rate of salt fog is 1-2ml/80cm2H, carrying out spray detection on the surface of the box body, and carrying out the next step after detection;
s4, detecting the tensile strength of the gear box, namely, detecting the tensile strength of the gear box by using a tensile strength tester, carrying out incremental detection on the tensile strength value of the gear box from 0MPa to 550MPa, and carrying out the next step after detection;
and S5, ultrasonic flaw detection, wherein ultrasonic penetrability penetrates into the welding position of the box body or the deep part of the metal material to detect and analyze the metal material, if a defect wave is displayed by an instrument in the material detection, the material has a defect, and if the defect wave is displayed by a detection instrument when the welding position is scanned in a zigzag manner, the welding position has a defect.
2. The strength test method for the box body of the transmission gearbox of the high-speed train according to claim 1, characterized by comprising the following steps of: in S1, the test data of the strain sensor is judged, the sensor changes the measurement data along with the change rule of the gear box load test, a stress spectrum is compiled according to the data, meanwhile, a vibration acceleration sensor and a dynamic signal analyzer can be added for detecting the vibration performance, the sensor is responsible for sensing the vibration and converting the physical quantity into an electric signal to be output, and the dynamic signal analyzer is responsible for acquiring and analyzing the signal.
3. The strength test method for the box body of the transmission gearbox of the high-speed train according to claim 1, characterized by comprising the following steps of: in S2, the next step is carried out after the air source pressure of the vacuum gauge is between 0.5MPa and 0.7MPa is kept for 5 to 10 min.
4. The strength test method for the box body of the transmission gearbox of the high-speed train according to claim 1, characterized by comprising the following steps of: in S2, after the vacuum test, the container to be tested is immersed in water by a water immersion method, and the presence or absence of air bubbles and the amount of air bubbles are observed to determine the sealing property of the container.
5. The strength test method for the box body of the transmission gearbox of the high-speed train according to claim 1, characterized by comprising the following steps of: in S3, the pH of the solution for corrosion detection is adjusted to a neutral range of 6 to 7 for 48 to 72 hours as a solution for spraying.
6. The strength test method for the box body of the transmission gearbox of the high-speed train according to claim 1, characterized by comprising the following steps of: in S4, the tensile strength exceeding 250MPa is a passing value in the table of values observed while the strength is increased by the tensile test.
7. The strength test method for the box body of the transmission gearbox of the high-speed train according to claim 1, characterized by comprising the following steps of: when the corrosion resistance of the gearbox is detected, the spraying duration is about 4-8 years of corrosion degree of normal use of the external environment within 48-72h, and the corrosion resistance is good if the surface oxidation degree or damage degree of the gearbox is low.
8. The strength test method for the box body of the transmission gearbox of the high-speed train according to claim 1, characterized by comprising the following steps of: and (5) observing the elongation of the gear box after the tensile test after the tensile strength of the gear box is detected.
9. The strength test method for the box body of the transmission gearbox of the high-speed train according to claim 1, characterized by comprising the following steps of: the corrosion resistance detection of the gearbox can be replaced by an acetate spray test or a copper salt accelerated acetate spray test.
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