CN217058675U - Device for measuring dynamic deformation of cylinder sleeve by using strain gauge and eddy current sensor - Google Patents
Device for measuring dynamic deformation of cylinder sleeve by using strain gauge and eddy current sensor Download PDFInfo
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- CN217058675U CN217058675U CN202220579849.9U CN202220579849U CN217058675U CN 217058675 U CN217058675 U CN 217058675U CN 202220579849 U CN202220579849 U CN 202220579849U CN 217058675 U CN217058675 U CN 217058675U
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- eddy current
- current sensor
- strain gauge
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Abstract
The utility model relates to an utilize foil gage and eddy current sensor to measure device of cylinder liner dynamic deformation, belong to engine design and manufacture field, aim at through pasting the foil gage in the cylinder liner outside, inside sets up the real-time deformation of eddy current sensor's mode detection engine cylinder liner, the data that detect two sensors pass through the connecting wire and transmit to the Ni data acquisition appearance, through the filtering, enlarge after handling and form the real-time deformation condition that two sensors detected on the display and carry out the real-time contrast under the cold condition with the cylinder liner, but real-time detection engine cylinder liner dynamic deformation, and solved the condition that the data error appears easily but can't effective perception in the in-process single sensor.
Description
Technical Field
The utility model relates to an utilize foil gage and eddy current sensor to measure device of cylinder liner dynamic deformation belongs to engine design and manufacturing field.
Background
The deformation of the cylinder sleeve is generally predicted by calculation through a finite element analysis method, so that data which are difficult to measure in a test are obtained. Because the deformation of the cylinder sleeve is the result of the coupling effect of multiple physical fields, the influence factors are numerous, and the accuracy of the calculation result is influenced by the simplification of modeling and the differentiation of analysis hypothesis. Therefore, the deformation of the cylinder sleeve is tested and analyzed by adopting a testing technology, accurate boundary conditions can be provided for calculation, and a finite element analysis model can be modified, so that the calculation accuracy is improved. Because the cylinder sleeve-piston friction pair is arranged in the engine, the arrangement of the sensor and the data output are difficult, the deformation test of the cylinder sleeve is always a difficult point of the test work, and particularly the related test work of the dynamic working deformation of the cylinder sleeve is rarely developed.
The deformation data of the general cylinder sleeve is directly obtained by actual measurement under the static state after the assembly and the work of a machine body assembly, and engine manufacturers at home and abroad usually adopt a three-dimensional measuring instrument to carry out the static deformation test of the cylinder sleeve and mainly serve as an on-line monitoring or batch sampling inspection means for controlling the cold machining or the assembly quality of an engine body. The static deformation measurement analysis can know the machining and manufacturing tolerance and the influence of the pre-tightening force of the evaluation bolt on the deformation of the cylinder sleeve, and the static deformation measurement of the heated assembly body can also know the thermal deformation condition of the cylinder sleeve caused by different materials and working temperatures and the influence of the difference of the thermal expansion coefficients. The measurement data is obtained statically in the engine, ignoring combustion-induced component temperature differences and mechanical loads generated by gas pressure in the engine.
Because a precision measuring instrument is expensive in price and can only measure static data of cylinder sleeve deformation, and for an engine in a working state, the method cannot be used for obtaining the data of the cylinder sleeve deformation, the study on the dynamic cylinder sleeve deformation mainly adopts an eddy current sensor, a strain gauge sensor and the like to directly or indirectly measure, and then data processing is carried out to obtain the actual deformation of the cylinder sleeve.
The invention also discloses a method for detecting the deformation of a cylinder sleeve by using an eddy current sensor in the Chinese invention patent CN 106555699B, but only one mode of the eddy current sensor is adopted in the patent, the eddy current sensor has high precision, the engine cannot work or be damaged under the condition of high temperature and high frequency vibration for a long time, the measured data is wrong at the moment, but the problem of the eddy current sensor cannot be known when the eddy current sensor occurs, so only one detection device of the eddy current sensor is unreasonable, a new detection device is required to be introduced for data comparison, the data can be considered to be valid only when the data error of the two devices is within the range of a threshold value, the arrangement position of the sensor and the adopted wireless mode are not advisable, and the device is lack of a data processing process, and the device overcomes the defects.
The invention content is as follows:
the utility model provides a device and a method for measuring dynamic deformation of a cylinder sleeve by utilizing a strain gauge and an eddy current sensor, which aims to arrange an eddy current sensor placing carrier on a piston of an engine, arrange the eddy current sensor on the eddy current sensor placing carrier, lead an eddy current sensor connecting wire to a double-swing arm through the eddy current sensor placing carrier, lead the double-swing arm out of the engine and connect the double-swing arm to a Ni data acquisition instrument, the strain gauge is pasted on the outer wall of the cylinder sleeve and is also connected to the Ni data acquisition instrument, because the strain gauge is clung to the outer wall of the cylinder sleeve, the strain gauge follows the deformation of the cylinder sleeve, the resistance value of the strain gauge changes along with the change of mechanical deformation, the change value of the resistance is in direct proportion to the strain of the surface of a component pasted by the strain gauge, therefore, the strain gauge can be attached to the outer wall of the cylinder sleeve, a strain amplifier is matched, and the strain test is carried out on the dynamic deformation of the cylinder sleeve, and the deformation of the cylinder sleeve is detected together by the eddy current sensor and the strain gauge, and is filtered and amplified. The eddy current measuring principle is an inductive measuring principle, an alternating current is introduced into a coil in an eddy current sensor, a magnetic field can be formed around the coil of the eddy current sensor, a conductor is arranged in the magnetic field, eddy current can be excited in the conductor according to Faraday's law of electromagnetic induction, according to Lenz's law, the direction of the magnetic field of the eddy current is just opposite to that of the magnetic field of the coil, the impedance value of the coil in a probe is changed, and the change of the impedance value is directly related to the distance between the coil and a measured object. Through above-mentioned two detection methods, can measure the deformation of cylinder liner simultaneously. The Ni data acquisition instrument is used for processing and displaying on the display, and an observer can compare the data of the Ni data acquisition instrument and the display and research the dynamic deformation of the cylinder sleeve.
The utility model adopts the technical proposal that: the utility model provides an utilize foil gage and eddy current sensor to measure device that cylinder liner dynamic deformation which characterized in that: comprises the following steps: the measuring device comprises a cylinder sleeve, a piston, a double-swing arm, a strain gauge, an eddy current sensor placing carrier, an eddy current sensor connecting wire, a Ni data acquisition instrument, a display, a connecting rod and a strain gauge connecting wire, wherein the cylinder sleeve, the piston, the double-swing arm and the connecting rod are original structures of an engine to be measured, and the strain gauge is attached to the outer wall of the cylinder sleeve.
Furthermore, the eddy current sensor placing carrier is in a star-shaped structure and is fixed on the piston, and the eddy current sensor placing carrier comprises a carrier body and a hollow pipeline.
Further, the hollow pipeline can adjust the extension length on the carrier main body, and further change the distance between the hollow pipeline and the cylinder sleeve.
Furthermore, the interior of the extended pipeline is hollow.
Furthermore, a second ring bank of the piston head is perforated, the hollow pipeline penetrates through the hole in the piston, and the hole diameter in the piston is larger than the diameter of the pipeline and is not in contact with the pipeline.
Furthermore, the eddy current sensor is placed at the pipeline opening of the hollow pipeline, and the connecting wire of the eddy current sensor is arranged inside the hollow pipeline at the position of the piston and is connected with the eddy current sensor.
Furthermore, the connecting wires of the eddy current sensors, which are connected with each eddy current sensor, are gathered into one strand in the carrier main body and fixed on the connecting rod and the double swing arm to extend to the Ni data acquisition instrument outside the engine body, and the Ni data acquisition instrument is connected with the display to display the processed data.
Furthermore, the connecting wire of the eddy current sensor is led out from the side surface of the oil pan through a drill hole.
Furthermore, the strain gauge connecting wire is led out through a water plugging piece drill hole on the machine body.
Furthermore, the strain gauge is attached to the outer wall corresponding to the position of the eddy current sensor on the piston, and the strain gauge and the eddy current sensor detect the deformation of the same piston area.
Furthermore, the strain gauge is fixedly attached to the outer portion of the cylinder sleeve, and the eddy current sensor reciprocates along with the piston.
Furthermore, an eddy current sensor and a row of strain gauges are combined into a detection basic unit, the detection basic unit can detect deformation of a line parallel to the section and the adjacent area on the cylinder sleeve, and the detection basic unit can be arranged in multiple groups.
Furthermore, the carrier main body for placing the carrier of the eddy current sensor is one, the side face of the carrier is provided with a plurality of hole sites for installing hollow pipelines, and the number of the hollow pipelines can be installed according to the requirement.
Further, the number of holes in the piston, i.e., the number of eddy current sensors, ranges from 1 to 8, compared to the maximum stress that the piston material can withstand.
Furthermore, data collected by a detection basic unit formed by a plurality of strain gauges and an eddy current sensor are deformation of the same area, so that the data are displayed on the same area position on a display, and the cylinder sleeve is cylindrical, so that when a collection point surrounds the cylinder sleeve for a circle, the displayed data can be fitted into an irregular cylinder, and finally, a cylinder and two irregular cylinders are displayed on the display, wherein the standard cylinder is in the original shape of the cylinder sleeve, and the two irregular cylinders are real-time data detected by the strain gauges and the eddy current sensor respectively.
Furthermore, after the strain gauge and the eddy current sensor respectively detect the deformation of the cylinder sleeve, data are output to a display, three cylinders can be displayed on the display, one cylinder is a standard cylinder in the cold state of the cylinder sleeve, the other two cylinders are real-time data detected by the strain gauge and the eddy current sensor, and observers can display the data as required.
A device for measuring dynamic deformation of a cylinder sleeve by using a strain gauge and an eddy current sensor comprises the following operation steps:
the method comprises the following steps: the testing method comprises the steps of disassembling an engine to be tested, punching a hole in a piston, fixing an eddy current sensor placing carrier on the piston, connecting an eddy current sensor with an eddy current sensor connecting wire and installing the eddy current sensor connecting wire on the eddy current sensor placing carrier, leading out the eddy current sensor connecting wire through a connecting rod and a double-swing arm and connecting the eddy current sensor connecting wire to an external Ni data acquisition instrument, attaching a strain gauge to the outer wall of a cylinder sleeve and connecting the strain gauge with the Ni data acquisition instrument, and connecting the data acquisition instrument with a display.
Step two: completing the process of the step one after the engine is disassembled, and then assembling the engine;
step three: starting the engine, enabling the engine to normally run, and electrifying the electric appliances involved in the experiment;
step four: the eddy current sensor and the strain gauge are used for testing the real-time dynamic deformation of the engine cylinder sleeve, and data are processed by the Ni data acquisition instrument and displayed on the display;
step five: observing the fitted graph by an experimenter, and recording, analyzing and processing experimental data;
step six: after the test is completed, all the electrical equipment is closed, and the work is repeated in the next test.
Compared with the prior art, the utility model has the advantages of it is following: 1. The combination of the strain gauge and the eddy current sensor solves the defect that a single sensor lacks data comparison; 2. The wired connection mode is adopted, so that the problems that data is easy to lose and real-time detection cannot be realized due to a wireless storage mode adopted in some schemes are solved; 3. and (4) testing the strength of the punched piston to determine the punching quantity and position of the piston.
Description of the drawings:
FIG. 1 is a schematic view of the movable structure of the present invention;
FIG. 2 is a schematic diagram of the effect of the present invention after installation;
FIG. 3 is a schematic diagram of the effect of the invention after installation (except for the engine housing);
FIG. 4 is a view of a portion of the cylinder liner of the present invention;
FIG. 5 is a schematic view of the attachment of the connection wires of the eddy current sensor of the present invention to a movable structure;
FIG. 6 is a partial cross-sectional view of the piston of the present invention;
FIG. 7 is a front view of an eddy current sensor carrier according to the present invention;
FIG. 8 is a bottom view of an eddy current sensor carrier in accordance with the present invention;
FIG. 9 is a cross-sectional view of an eddy current sensor carrier in accordance with the present invention;
FIG. 10 is a schematic diagram of the detection logic of the present invention.
The reference numbers in the figures are: the device comprises a cylinder sleeve 1, a piston 2, a double swing arm 3, a strain gauge 4, an eddy current sensor 5, an eddy current sensor 6, a carrier 601, a carrier main body 602, a hollow pipeline 602, an eddy current sensor 7 connecting line 8, a Ni data acquisition instrument, a display 9, a connecting rod 10 and a strain gauge 11.
The specific implementation mode is as follows:
in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings in combination with the following embodiments. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Please refer to fig. 1-3; the utility model provides an utilize foil gage and eddy current sensor to measure device and measuring method of cylinder liner dynamic deformation, its purpose is through setting up eddy current sensor on piston 2 at the engine and placing carrier 6, place eddy current sensor 5 and place carrier 6 on eddy current sensor, eddy current sensor connecting wire 7 places carrier 6 through eddy current sensor and draws on double pendulum arm 3 and connecting rod 10 drawing the engine external world and being connected to Ni data acquisition instrument 8, foil gage 4 pastes at 2 outer walls of cylinder liner, also be connected to on the Ni data acquisition instrument 8, detect 1 deformation of cylinder liner jointly through eddy current sensor 5 and foil gage 4, through filtering, enlarge. The strain gauge 4 is tightly attached to the outer wall of the cylinder sleeve 1 and deforms along with the deformation of the cylinder sleeve 1, the resistance value of the strain gauge changes along with the change of the mechanical deformation, the change value of the resistance is in direct proportion to the strain of the surface of a component pasted by the strain gauge 4, and therefore strain testing can be performed on the dynamic deformation of the cylinder sleeve 1 through the strain gauge attached to the outer wall of the cylinder sleeve 1 and matched with a strain amplifier. The eddy current measuring principle is an inductive measuring principle, an alternating current is led into a coil in an eddy current sensor 5, a magnetic field can be formed around the coil of the eddy current sensor 5, a conductor is arranged in the magnetic field, eddy current can be excited in the conductor according to the Faraday's law of electromagnetic induction, according to the Lenz's law, the direction of the magnetic field of the eddy current is just opposite to that of the magnetic field of the coil, the impedance value of the coil in a probe is changed, and the change of the impedance value is directly related to the distance between the coil and a measured object. Through above-mentioned two detection methods, can measure the deformation of cylinder liner 1 simultaneously. The Ni data acquisition instrument 8 is processed and then displayed on the display 9, and an observer can compare the data of the Ni data acquisition instrument and the display to study the dynamic deformation of the cylinder sleeve 1.
The utility model adopts the technical proposal that: the utility model provides an utilize foil gage and eddy current sensor to measure device that cylinder liner dynamic deformation which characterized in that: comprises the following steps: cylinder liner 1, piston 2, double pendulum arm 3, foil gage 4, eddy current sensor 5, eddy current sensor place carrier 6, eddy current sensor connecting wire 7, Ni data acquisition instrument 8, display 9, connecting rod 10, foil gage connecting wire 11 and constitute, cylinder liner 1, piston 2, double pendulum arm 3 are the original structure of the engine of measurand, and foil gage 4 pastes on 1 outer wall of cylinder liner.
Further, the eddy current sensor placement carrier 6 is of a star-shaped structure, is fixed on the piston 2, and includes a carrier body 601 and a hollow pipe 602.
Further, the hollow pipe 602 may adjust an extension length on the carrier body 601, thereby changing a distance from the cylinder liner 1.
Furthermore, the interior of the extended pipeline is hollow.
Further, a second ring bank of the head of the piston 2 is perforated, a hollow pipe 602 passes through the hole on the piston 2, and the diameter of the hole on the piston 2 is larger than the diameter of the pipe, so that the hollow pipe and the pipe are not in contact with each other.
Further, the eddy current sensor 5 is placed at the pipe port of the hollow pipe 602, and the eddy current sensor connecting wire 7 is arranged inside the hollow pipe 602 at the piston 2 and connected with the eddy current sensor 5.
Furthermore, the eddy current sensor connecting wires 7 connecting the eddy current sensors 5 are gathered into one strand on the carrier main body 602, fixed on the connecting rod and the double-swing arm 3 and extended to the external Ni data acquisition instrument 8 of the engine body, and the Ni data acquisition instrument 8 is connected with the display 9 to display the processed data.
Furthermore, the connection wire 7 of the eddy current sensor is drilled and led out from the side surface of the oil pan.
Further, the strain gauge connecting wire 11 is led out through a water plugging piece drill hole on the machine body.
Furthermore, the strain gauge 4 is attached to the outer wall of the cylinder liner 1 corresponding to the position of the eddy current sensor 5 on the piston 2, and the strain gauge and the eddy current sensor 4 detect the deformation of the same piston 2 area.
Furthermore, the strain gauge 4 is fixedly attached to the outside of the cylinder sleeve 1, and the eddy current sensor 5 reciprocates along with the piston 2.
Furthermore, an eddy current sensor 5 and a row of strain gauges 4 are combined into a detection basic unit, the group of detection basic units can detect deformation of a line parallel to the cross section of the cylinder sleeve 1 and a nearby area, and the detection basic units can be arranged in a plurality of groups.
Furthermore, the eddy current sensor placing carrier 6 has one carrier body 601, and the side surface of the carrier body is provided with a plurality of hole sites for installing the hollow pipes 602, so that the number of the hollow pipes 602 can be installed according to the requirement.
Further, the number of holes in the piston 2, i.e. the number of eddy current sensors 5, ranges from 1 to 8, compared to the maximum stress that the material of the piston 2 can withstand.
Further, since the data collected by the strain gauge 4 and the eddy current sensor 5 are at the same position, the data are displayed at the same area position on the display 9, and since the cylinder sleeve 1 is cylindrical, when the collection point surrounds the cylinder sleeve 1 for one circle, the displayed data can be fitted into an irregular cylinder, so that a cylinder and two irregular cylinders are finally displayed on the display 9, the standard cylinder is the original shape of the cylinder sleeve 1, and the two irregular cylinders are respectively real-time data detected by the strain gauge 4 and the eddy current sensor 5.
Furthermore, after the strain gauge 4 and the eddy current sensor 5 detect the deformation of the cylinder sleeve 1 respectively, data are output to the display 9, three cylinders can be displayed on the display 9, one cylinder is a standard cylinder in the cold state of the cylinder sleeve 1, the other two cylinders are real-time data detected by the strain gauge 4 and the eddy current sensor 5, and observers can display the data as required.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims, or the equivalents of such scope and boundaries.
Claims (7)
1. The utility model provides an utilize foil gage and eddy current sensor to measure device that cylinder liner dynamic deformation which characterized in that: comprises the following steps: the cylinder sleeve (1), the piston (2), the double-swing arm (3), the strain gauge (4), the eddy current sensor (5), an eddy current sensor placing carrier (6), an eddy current sensor connecting wire (7), a Ni data acquisition instrument (8), a display (9), a connecting rod (10) and a strain gauge connecting wire (11) are formed, the cylinder sleeve (1), the piston (2), the double-swing arm (3) and the connecting rod (10) are of an original structure of a measured engine, the strain gauge (4) is attached to the outer wall of the cylinder sleeve (1), the eddy current sensor placing carrier (6) is of a star-shaped structure and is fixed on the piston (2) and comprises a carrier main body (601) and a hollow pipeline (602), the hollow pipeline (602) is hollow, the eddy current sensor (5) is placed at a pipeline opening of the hollow pipeline (602), the eddy current sensor connecting wire (7) is arranged inside the hollow pipeline (602) at the piston (2), the electric eddy current sensor connecting wire (7) connected with each electric eddy current sensor (5) is converged into one strand on the carrier main body (601) and fixed on the double swing arm (3) and extends to the Ni data acquisition instrument (8) outside the engine body, and the Ni data acquisition instrument (8) is connected with the display (9) to display the processed data.
2. The device for measuring the dynamic deformation of the cylinder sleeve by using the strain gauge and the eddy current sensor as claimed in claim 1, wherein: the second ring bank at the head of the piston (2) is perforated, a hollow pipeline (602) passes through the hole on the piston (2), and the hole diameter on the piston (2) is larger than the pipeline diameter and is not contacted with each other.
3. The device for measuring the dynamic deformation of the cylinder sleeve by using the strain gauge and the eddy current sensor as claimed in claim 1, wherein: the hollow pipe (602) is connected with the carrier body (601) through threads, and the extending length of the hollow pipe (602) on the carrier body (601) can be changed through rotation.
4. The device for measuring the dynamic deformation of the cylinder sleeve by using the strain gauge and the eddy current sensor as claimed in claim 1, wherein: and the connecting wire (7) of the eddy current sensor is led out from the side surface of the oil pan by drilling.
5. The device for measuring the dynamic deformation of the cylinder sleeve by using the strain gauge and the eddy current sensor as claimed in claim 1, wherein: the strain gauge connecting wire (11) is led out through a water plugging piece drill hole on the machine body.
6. The device for measuring the dynamic deformation of the cylinder sleeve by using the strain gauge and the eddy current sensor as claimed in claim 1, wherein: the carrier body (601) of the eddy current sensor placing carrier (6) is one, a plurality of hole sites for installing the hollow pipelines (602) are arranged on the side face of the eddy current sensor placing carrier, and the number of the hollow pipelines (602) can be installed according to requirements.
7. The device for measuring the dynamic deformation of the cylinder sleeve by using the strain gauge and the eddy current sensor as claimed in claim 5, wherein: the number of the eddy current sensors (5) ranges from 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220579849.9U CN217058675U (en) | 2022-03-17 | 2022-03-17 | Device for measuring dynamic deformation of cylinder sleeve by using strain gauge and eddy current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220579849.9U CN217058675U (en) | 2022-03-17 | 2022-03-17 | Device for measuring dynamic deformation of cylinder sleeve by using strain gauge and eddy current sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217058675U true CN217058675U (en) | 2022-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220579849.9U Expired - Fee Related CN217058675U (en) | 2022-03-17 | 2022-03-17 | Device for measuring dynamic deformation of cylinder sleeve by using strain gauge and eddy current sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217058675U (en) |
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2022
- 2022-03-17 CN CN202220579849.9U patent/CN217058675U/en not_active Expired - Fee Related
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Granted publication date: 20220726 |