CN113267561A - Real-time detection device for fatigue cracks of cylinder sleeve - Google Patents
Real-time detection device for fatigue cracks of cylinder sleeve Download PDFInfo
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- CN113267561A CN113267561A CN202110667514.2A CN202110667514A CN113267561A CN 113267561 A CN113267561 A CN 113267561A CN 202110667514 A CN202110667514 A CN 202110667514A CN 113267561 A CN113267561 A CN 113267561A
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- cylinder
- cylinder sleeve
- servo motor
- eddy current
- current sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
Abstract
The invention provides a real-time detection device for fatigue cracks of a cylinder sleeve, which comprises the cylinder sleeve, a rotating device, a lifting device and a computer, wherein the upper end of the rotating device extends into the cylinder sleeve, the lifting device is used for realizing the up-and-down movement of the rotating device, an eddy current sensor used for detecting the inner wall of the cylinder sleeve is fixed at the upper end of the rotating device, the eddy current sensor is driven by the rotating device to realize the detection of the circumferential direction of the cylinder sleeve, and the lifting device realizes the detection of different axial positions in the cylinder sleeve by the eddy current sensor; the computer realizes the control of the detection path of the eddy current sensor and the recording of the detection result. The real-time detection device for the fatigue cracks of the cylinder sleeve, provided by the invention, has a simple structure, is easy to operate, and can be used for quickly and accurately detecting the fatigue cracks of the inner surface of the cylinder sleeve.
Description
Technical Field
The invention relates to a cylinder sleeve fatigue crack detection system, in particular to a real-time cylinder sleeve fatigue crack detection device.
Background
The cylinder sleeve is an important part of the internal combustion engine, is arranged in a cylinder body hole of an engine body, and is tightly pressed and fixed by a cylinder cover. When the gas-cooling type cylinder liner works, the inner surface of the cylinder liner is acted by high-temperature and high-pressure gas, the outer surface of the cylinder liner is directly contacted with cooling water, and severe thermal stress can be generated under the condition of large temperature difference. In addition, the cylinder liner is subjected to piston side thrust and installation pretension from the cylinder head. This results in fatigue cracks in the liner, affecting its reliability and durability, with a considerable proportion of fatigue failures occurring in the stepped surfaces of the liner longitudinal supports.
Up to now, there are three main studies on the fatigue life of the cylinder liner. Firstly, a finite element simulation calculation method is mainly adopted, but due to the limitation of various conditions, the accuracy of the calculation result is not high, and the calculation result is to be tested and verified. Secondly, the method is installed on an engine to carry out a durability test, has long period and high cost, and can be only carried out at the later stage of the development of a prototype. And thirdly, performing a fatigue test on a fatigue testing machine, which can shorten the test period, but the fatigue testing machine can only provide load and cannot detect which specific position on the surface of the cylinder liner generates the fatigue crack. At present, a method for rapidly detecting the position and the moment of the fatigue crack generated on the surface of the cylinder sleeve is lacked.
Disclosure of Invention
The invention aims to provide a real-time detection device for fatigue cracks of a cylinder sleeve, which is used for quickly detecting the position and the moment of the generation of the fatigue cracks of the cylinder sleeve for carrying out a fatigue test.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme. The invention provides a real-time detection device for fatigue cracks of a cylinder sleeve, which comprises: the detection device comprises a cylinder sleeve 22, a rotating device with the upper end extending into the cylinder sleeve 22, a lifting device for realizing the up-and-down movement of the rotating device and a computer 25, wherein the upper end of the rotating device is fixed with an eddy current sensor 16 for detecting the inner wall of the cylinder sleeve 22, the eddy current sensor 16 is driven by the rotating device to realize the detection of the circumferential direction of the cylinder sleeve 22, and the lifting device realizes the detection of the eddy current sensor 16 on different axial positions in the cylinder sleeve 22; the computer controls the detection path of the eddy current sensor 16 and records the detection result.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
The cylinder jacket fatigue crack real-time detection device comprises an upper flat plate 6 which is used for being connected with a rotating device, two ends of the upper flat plate 6 are connected with a screw rod through nuts, the tail of the screw rod is connected with a lifting servo motor, the lifting servo motor is fixed on a lower flat plate 6, and a lower flat plate support 1 is fixedly supported at the bottom of the lower flat plate 6.
The device for detecting the fatigue cracks of the cylinder liners in real time comprises an axial bracket 14 which is arranged on an upper flat plate 7 through a rolling bearing 12, wherein the upper end of the axial bracket 14 extends into the cylinder liner 22 and is connected with a radial bracket 15, and an eddy current sensor 16 is connected on the radial bracket 15; a rotary servo motor 11 fixed at the bottom of the upper flat plate 7 provides rotary power for the axial bracket 14 through a spur gear 10.
The real-time detection device for the fatigue cracks of the cylinder sleeve further comprises a servo motor driver 23 and a pre-positioning device 24, wherein the eddy current sensor 16 is sequentially connected with the pre-positioning device 24 and the computer 25, and the rotary servo motor 11 and the lifting servo motor are sequentially connected with the servo motor driver 23 and the computer 25.
In the cylinder liner fatigue crack real-time detection device, the axial support 14 and the radial support 15 are both telescopic supports.
In the real-time detection device for fatigue cracks of the cylinder liner, the axial bracket 14 is coaxial with the cylinder liner 22, and the axial bracket 14 is also detachably assembled with an axis centering device for finding the axis of the cylinder liner 22.
In the real-time detection device for fatigue cracks of the cylinder liner, the axis centering device is a sleeve 13 sleeved on the axial support 14, and the sleeve 13 realizes the centering and coaxiality of the axial support 14 and the cylinder liner 22 through 3 cylinders with mutually 120-degree taper angles on the periphery of the sleeve.
The device for detecting the fatigue cracks of the cylinder liner in real time further comprises an engine body for accommodating the cylinder liner 22, a cylinder head 26 fixed at the top of the engine body, a support frame 27 supported at the bottom of the engine body and the cylinder head 26 fixed at the top of the cylinder liner, wherein two ends of the lifting device extend out of the support frame 27.
The real-time detection device for the fatigue cracks of the cylinder sleeve, provided by the invention, has at least one or one part of the following beneficial effects:
the real-time detection device for the fatigue cracks of the cylinder sleeve is simple in structure, simple in principle and simple to operate;
according to the real-time detection device for the fatigue cracks of the cylinder sleeve, the fatigue crack condition of the inner surface of the cylinder sleeve is detected by adopting the eddy current sensor, and compared with a strain gauge for measuring the strain of a certain point of the cylinder sleeve, the real-time detection device for the fatigue cracks of the cylinder sleeve can comprehensively detect the inner surface of the cylinder sleeve;
according to the real-time detection device for the fatigue cracks of the cylinder sleeve, the cylinder sleeve can be quickly centered by the sleeve centering device before measurement, so that the detection mechanism is coaxial with the cylinder sleeve, and the accuracy of test measurement is ensured;
the invention relates to a real-time detection device for fatigue cracks of a cylinder sleeve, which is characterized in that the axial position of an eddy current sensor is preliminarily adjusted through an axial telescopic bracket according to the actual size and position space of a test sample, the radial position of the eddy current sensor is adjusted through a radial telescopic bracket to adapt to different inner diameters of the cylinder sleeve, two lifting servo motors are used for finely controlling the movement of the eddy current sensor in the axial direction, the servo motors are used for controlling the eddy current sensor to rotate around the axis of the cylinder sleeve through a spur gear, the fatigue crack condition of the inner surface of the whole cylinder sleeve can be detected, the position where the fatigue cracks can appear is not required to be calculated in advance, and the detection and measurement have confidence.
Drawings
FIG. 1 is a schematic structural diagram of a real-time fatigue crack detection device for a cylinder liner according to the present invention;
FIG. 2 is a side view of FIG. 1 without the elevator assembly;
fig. 3 is a flow chart of the real-time detection device for fatigue cracks of the cylinder liner.
[ description of main element symbols ]
1-lower plate holder
2-lifting servo motor I
3-lifting servo motor II
4-nut I
5-nut II
6-lower plate
7-Upper plate
8-screw mandrel I
9-screw mandrel II
10-straight gear
11-rotary servo motor
12-rolling bearing
13-sleeve
14-axial stent
15-radial stent
16-electric eddy current sensor
17-test sample
18-bolt I
19-bolt II
20-bolt III
21-bolt IV
22-cylinder liner
23-servomotor drive
24-preposition device
25-computer
26-cylinder head
27-support frame
28-engine body
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the predetermined objects, the following detailed description will be made on the specific implementation, structure, features and effects of the present invention with reference to the accompanying drawings and preferred embodiments.
Please refer to fig. 1-3, which are schematic structural diagrams of each part of a real-time cylinder liner fatigue crack detection apparatus according to the present invention, the detection system includes a cylinder liner 22, a rotation apparatus with an upper end extending into the cylinder liner 22, and a lifting apparatus for moving the rotation apparatus up and down, wherein an eddy current sensor 16 for detecting an inner wall of the cylinder liner 22 is fixed at the upper end of the rotation apparatus, the eddy current sensor 16 is driven by the rotation apparatus to detect a circumferential direction of the cylinder liner 22, and the lifting apparatus can detect different axial positions in the cylinder liner 22 by the eddy current sensor, that is, the rotation apparatus and the lifting apparatus cooperate together to detect different positions in the cylinder liner by the eddy current sensor 16.
The detection system further comprises a servo motor driver 23, a front-end device 24 and a computer 25, wherein the eddy current sensor 16 is sequentially connected with the front-end device 24 and the computer 25, and the rotary servo motor 11, the lifting servo motor I2 and the lifting servo motor II 3 are sequentially connected with the servo motor driver 23 and the computer 25.
In the embodiment of the invention, the lifting device comprises an upper flat plate 6 for realizing connection with the rotating device, two ends of the upper flat plate 6 are connected with a screw rod through nuts, the tail part of the screw rod is connected with a lifting servo motor, the lifting servo motor is fixed on a lower flat plate 6, and the bottom of the lower flat plate 6 is fixedly supported with a lower flat plate bracket 1. Concretely, lift servo motor includes lift servo motor I2 and lift servo motor II 3, the lead screw includes lead screw I8 and lead screw II 9, and wherein lead screw I8 drives through lift servo motor I2, lead screw II 9 drives through lift servo motor II 3, it reciprocates to go up dull and stereotyped 7 under the drive of lead screw I8 and lead screw II 9. Wherein, bolt III 20 will go up dull and stereotyped 7 and install on nut I4 and nut II 5, nut I4 and nut II 5 move on I8 of lead screw and II 9 of lead screw respectively, and I8 of lead screw and II 9 of lead screw are installed respectively in lift servo motor I2 and lift servo motor II 3, and lift servo motor I2 and lift servo motor II 3 pass through bolt II 19 and install on dull and stereotyped 6 down, and dull and stereotyped 6 is installed on dull and stereotyped support 1 down through bolt I18 down.
The rotating device comprises a rotating servo motor 11, a straight gear 10, a rolling bearing 12, an axial support 14 and a radial support 15, wherein one end of the radial support 15 is connected with an eddy current sensor 16, the other end of the radial support is connected with the axial support 14, the lower end of the axial support 14 is installed on an upper flat plate 7 through the rolling bearing 12, the bottom of the axial support 14 is connected with the straight gear 10 in a matched mode, the straight gear 10 is driven by the rotating servo motor 11, and the rotating servo motor 11 is installed on the upper flat plate 7 through a bolt IV 21. Specifically, the rotary servo motor 11 and the spur gear 10 are both positioned at the bottom of the upper flat plate 7.
In order to adapt to the cylinder jackets 22 with different dimensions, the axial brackets 14 and the radial brackets 15 are telescopic brackets, different cylinder jacket depths can be adapted by adjusting the axial brackets 14, and different cylinder jacket diameters can be adapted by adjusting the radial brackets 15. The radial support 15 can adjust the radial position of the eddy current sensor 16 according to the diameter of the cylinder liner. The axial support 14 can be used to preliminarily adjust the axial position of the eddy current sensor 16 according to the actual space inside the test specimen 17. The radial support 15 and the axial support 14 are perpendicular to each other, and the axial support 14 is parallel to the axis of the cylinder sleeve 22.
In the present embodiment, the axial support 14 is coaxial with the cylinder liner 22. In order to realize the alignment and debugging of the central axes of the axial support 14 and the cylinder sleeve 22, the axial support 14 of the invention can be also detachably assembled with a sleeve 13, the sleeve 13 is sleeved on the axial support 14, 3 cylinders with 120-degree taper angles are uniformly distributed on the periphery of the sleeve 13, and the included angles between the three cylinders and the axial support 14 are the same, preferably acute angles. These three cylinders are centered by the principle of an equilateral triangle circumscribing a circle, so that the axial support 14 is coaxial with the cylinder liner 22. After the debugging is finished, the sleeve 13 is taken down or slid down onto the upper flat plate so as to avoid interference with the cylinder sleeve in the detection process.
When the device is used, the rotating servo motor 11 drives the straight gear 10 to enable the axial support 14 to rotate around the axis, so that the eddy current sensor 16 rotates around the axis of the cylinder sleeve 22, the lifting servo motor I2 and the lifting servo motor II 3 synchronously drive the upper flat plate 7 to move axially, and the axial movement of the eddy current sensor 16 can be controlled. This enables the eddy current sensor 16 to detect the inner surface of the cylinder liner 22 in a comprehensive manner.
In order to meet the space requirement when the rotating device and the lifting device are assembled and facilitate the installation and fixation of the test sample on the fatigue testing machine, the detection system further comprises an engine body 28 for accommodating the cylinder sleeve 22 and a support frame 27 supported at the bottom of the engine body 28, wherein the support frame 27 comprises support plates 271 at two sides and a fixing plate 272 positioned at the bottom of the support plates 271. The two ends of the lifting device extend out of the supporting frame 27. The engine block 28, the support frame 27, the cylinder liner 22 and the cylinder head 26 fixed to the top of the engine block 28 constitute a sample 17. In the present embodiment, the cylinder head 26 and the engine block 28 are also sealed by a cylinder gasket.
When the test device is used, the tested sample 17 is clamped on a fatigue testing machine, and the load borne by the cylinder sleeve in the actual working process is simulated through the fatigue testing machine. Meanwhile, the eddy current sensor 16 starts to detect the fatigue crack condition of the cylinder sleeve 22, before the test, the control programs of the lifting servo motor I2, the lifting servo motor II 3 and the rotating servo motor 11 are input into the computer 25, the control programs are used for controlling and recording the rotating speeds of the lifting servo motor I2, the lifting servo motor II 3 and the rotating servo motor 11, so that the axial and radial movement of the eddy current sensor 16 is realized, and the sweeping path and the actual spatial position of the eddy current sensor 16 are recorded through calculation. The eddy current sensor 16 performs eddy current detection on the inner surface of the cylinder sleeve 22, the computer 25 displays the curve of the voltage transmitted by the eddy current sensor 16 along the path, and when a crack is detected, the computer 25 marks the position and time of the crack. Therefore, the real-time detection device for the fatigue cracks of the cylinder sleeve can quickly and accurately detect the fatigue crack conditions of the inner surface of the cylinder sleeve at any time and any place.
The present invention also tests for cylinder liners that have been used.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The utility model provides a cylinder jacket fatigue crack real-time detection device which characterized in that includes: the device comprises a cylinder sleeve, a rotating device, a lifting device and a computer, wherein the upper end of the rotating device extends into the cylinder sleeve, the lifting device is used for realizing the up-and-down movement of the rotating device, an eddy current sensor used for detecting the inner wall of the cylinder sleeve is fixed at the upper end of the rotating device, the eddy current sensor is driven by the rotating device to realize the detection of the circumferential direction of the cylinder sleeve, and the lifting device realizes the detection of the eddy current sensor on different axial positions in the cylinder sleeve; the computer realizes the control of the detection path of the eddy current sensor and the recording of the detection result.
2. The device for detecting the fatigue cracks of the cylinder liner according to claim 1, wherein the lifting device comprises an upper plate for connecting with the rotating device, two ends of the upper plate are connected with a screw rod through nuts, the tail of the screw rod is connected with a lifting servo motor, the lifting servo motor is fixed on a lower plate, and a lower plate support is fixedly supported at the bottom of the lower plate.
3. The cylinder liner fatigue crack real-time detection device of claim 2, wherein the rotating device comprises an axial bracket mounted on the upper plate through a rolling bearing, the upper end of the axial bracket extends into the cylinder liner and is connected with a radial bracket, and the eddy current sensor is connected with the radial bracket; and a rotary servo motor fixed at the bottom of the upper flat plate provides rotary power for the axial support through a straight gear.
4. The real-time cylinder liner fatigue crack detection device of claim 3, further comprising a servo motor driver and a pre-positioner, wherein the eddy current sensor is sequentially connected with the pre-positioner and the computer, and the rotary servo motor and the lifting servo motor are sequentially connected with the servo motor driver and the computer.
5. The device for detecting the fatigue cracks of the cylinder liners in real time as claimed in claim 3, wherein the axial support and the radial support are both telescopic supports.
6. The device for detecting the fatigue cracks of the cylinder liner in real time as claimed in claim 3, wherein the axial support is coaxial with the cylinder liner, and the axial support is also detachably assembled with an axial center centering device for finding the axial center of the cylinder liner.
7. The device for detecting the fatigue cracks of the cylinder liner in real time as claimed in claim 6, wherein the axial center centering device is a sleeve sleeved on the axial support, and the sleeve realizes the centering and coaxiality of the axial support and the cylinder liner through 3 cylinders with mutually 120-degree taper angles on the outer periphery of the sleeve.
8. The cylinder liner fatigue crack real-time detection device of claim 1, characterized in that: the cylinder sleeve lifting device comprises a cylinder sleeve, a cylinder cover and a lifting device, and is characterized by further comprising an engine body for accommodating the cylinder sleeve, the cylinder cover is fixed to the top of the engine body, and a support frame is supported at the bottom of the engine body, and two ends of the lifting device extend out of the support frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110667514.2A CN113267561A (en) | 2021-06-16 | 2021-06-16 | Real-time detection device for fatigue cracks of cylinder sleeve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110667514.2A CN113267561A (en) | 2021-06-16 | 2021-06-16 | Real-time detection device for fatigue cracks of cylinder sleeve |
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| Publication Number | Publication Date |
|---|---|
| CN113267561A true CN113267561A (en) | 2021-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110667514.2A Pending CN113267561A (en) | 2021-06-16 | 2021-06-16 | Real-time detection device for fatigue cracks of cylinder sleeve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114754663A (en) * | 2022-03-17 | 2022-07-15 | 昆明理工大学 | Cylinder sleeve thermal deformation measuring device combining strain gauge and eddy current sensor |
-
2021
- 2021-06-16 CN CN202110667514.2A patent/CN113267561A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114754663A (en) * | 2022-03-17 | 2022-07-15 | 昆明理工大学 | Cylinder sleeve thermal deformation measuring device combining strain gauge and eddy current sensor |
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