CN109632313B - Engine valve motion law measuring device and method for complex oil mist environment - Google Patents
Engine valve motion law measuring device and method for complex oil mist environment Download PDFInfo
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- CN109632313B CN109632313B CN201811346405.5A CN201811346405A CN109632313B CN 109632313 B CN109632313 B CN 109632313B CN 201811346405 A CN201811346405 A CN 201811346405A CN 109632313 B CN109632313 B CN 109632313B
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- G01M15/00—Testing of engines
Abstract
The invention belongs to the technical field of engine testing, and particularly discloses an engine valve motion law measuring device and method for a complex oil mist environment, wherein the engine valve motion law measuring device comprises a laser displacement sensor, a fixed seat, a laser light path oil separation cover, a valve clamping block and a dynamic signal acquisition and analysis system, the laser displacement sensor is arranged on the fixed seat and used for emitting laser, the laser is received by the laser displacement sensor after being scattered on a measuring surface of the valve clamping block, and the received laser signal is converted into an electric signal to be transmitted to the dynamic signal acquisition and analysis system; the laser light path oil separation cover covers the outside of the laser displacement sensor; the middle part of the valve clamping block is provided with a valve rod fixing hole, one end of the valve clamping block is provided with a measuring surface, and an oil separation plate and an oil unloading groove are also arranged between the valve rod fixing hole and the measuring surface; the dynamic signal acquisition and analysis system is connected with the laser displacement sensor. The invention is suitable for realizing real-time accurate measurement of the valve motion law in a complex oil mist environment, and has the advantages of simple structure, accurate measurement and the like.
Description
Technical Field
The invention belongs to the technical field of engine testing, and particularly relates to an engine valve motion rule measuring device and method for a complex oil mist environment.
Background
The valve mechanism is one of two major motion mechanisms of the engine, and the valve is opened or closed at regular time according to the working cycle rule of the engine, so that fresh air enters the cylinder, and waste gas is discharged from the cylinder to form reasonable circulation of working media. Meanwhile, the sealing of the combustion chamber is ensured in the compression process and the work doing process of the engine, and stronger work doing capability is formed. The valve operating state directly influences the air exchange process of the engine, further influences the combustion performance and the emission level of the engine, and plays a vital role in the engine. Therefore, the method for measuring the valve motion rule of the engine in the real-machine running state has important guiding significance for optimizing the design of the engine valve mechanism, evaluating the running state of the engine valve mechanism, ensuring the reliable running of the engine and the like.
The measurement of the valve motion law mainly comprises the measurement of valve lift. The measurement of the valve lift at present is roughly divided into four types: the static measurement method is mainly used for performing static measurement on whether valve assembly meets requirements after the engine is assembled. Such measurements are widely used in assembly monitoring of various automobile companies or engine companies, and the corresponding patents are the most, such as CN201020700356.3, CN201110424884.x, CN201210060271.7, CN201520101336.7, CN201611100436.3, and the like. The measurement usually realizes the rotation of the engine through a turning gear mode, the rotating speed is very low, the valve motion law of the measurement is completely different from the kinematic and dynamic laws of the valve motion of the engine in the actual operation state, and the acceleration and deceleration motion of the valve in the actual operation state of the engine does not exist, so that the abnormal motion characteristics of valve runaway, rebound and the like cannot be obtained. Therefore, such measurement methods can only be used to monitor whether the valve lift after assembly of the engine is in accordance with the design situation. And the method is used for measuring the valve lift of the air passage experiment table, is relatively simpler, is only used for measuring the valve lift under different valve lift states, and does not relate to the measurement of the valve motion law. Such research and patents are relatively rare due to the relatively simple process. Thirdly, measuring the valve motion law on a valve motion simulation experiment table and a simulation experiment table. The measurement can well measure the valve motion law on the simulation experiment table, but because the expansion and contraction conditions of a valve push rod and the like cannot be simulated in the valve motion simulation experiment table and the vibration influence of an engine is avoided, the measured valve motion law is relatively ideal and is different from the valve motion law in the real-engine running state of the engine. There are also many patents for such measurements, such as CN201220152112.5, CN201310188820.3, CN201610724010.9, etc. Fourthly, the valve motion rule is measured on line under the real-time running state of the engine. The measurement is carried out under the actual operation working condition of the engine, the influence of expansion and contraction of the valve and the push rod under different engine working conditions and the influence of vibration of the engine are included, the kinematic law and the dynamic law of the valve obtained by the measurement are more real, the valve flying off, the valve bounce, the valve abrasion, the valve impact and the stress condition which are analyzed according to the laws are more real, and the design of an engine valve mechanism can be guided better. As such measurements are more engine-practical, corresponding measurement methods have begun to grow slowly, and corresponding patents are CN201110418961.0, CN201320042644.8, CN201320045694.1, etc.
The four types of measurement methods have advantages and disadvantages and are suitable for different purposes. In the assembly detection of the engine, the valve lift at each corner is measured in a simple manner such as a dial indicator, and a valve lift curve of the engine is obtained. However, the method cannot realize the measurement of the valve motion rule of the engine in the real-machine running state, has little significance for the detection and monitoring of the real-machine running state of the engine, and cannot guide the design and optimization of the valve actuating mechanism of the engine. The valve motion simulation experiment table usually adopts a motor to drive a valve mechanism to move so as to simulate the motion law of a valve. The valve motion simulation experiment table is a simplified engine valve mechanism, the measurement space in the simulation experiment table is larger, and meanwhile, some complex environments can be eliminated, so the measurement difficulty is relatively small. The measurement has guiding significance on the design of the valve and can guide the design of a valve mechanism for preventing the valve from flying off and bouncing, but the valve mechanism cannot accurately simulate the thermal expansion condition of the valve mechanism and the stress influence of the vibration of an engine on the valve mechanism, so certain defects exist, and the guiding significance on the stress and wear analysis of the valve mechanism is relatively insufficient.
In the real machine measurement, there are various specific measurement methods, such as measuring the valve lift by using a rod-type displacement sensor such as a differential pressure-changing displacement sensor; measuring the lift of the valve by adopting an electronic micrometer; recording the valve motion process by adopting high-speed camera shooting, and obtaining the valve motion rule by using an image processing method; a laser displacement sensor or the like is used. The rod type displacement sensor has limited moving speed allowed by the measuring rod, cannot measure the valve lift at high rotating speed, and the sensors are fixed with the valve, so that the mass of a valve moving part is greatly increased, the inertia rule of valve movement is changed, and the original movement characteristic of the valve is changed. The laser displacement measurement and the high-speed camera measurement are non-contact measurement, the original characteristic of the valve motion cannot be changed, the valve motion rule is more beneficial to research, the high-speed camera measurement needs to perform data processing on the collected picture to obtain the valve motion rule, the process is more complicated, and the measurement is simpler and more convenient than that of a laser displacement sensor. During the operation of the engine, a large amount of lubricating oil exists in the cylinder head cover of the engine, particularly near the valve, so as to lubricate the valve train moving pair, and the lubricating oil is often in the form of oil drops or oil mist near the valve. The laser displacement sensor is used for measuring displacement by transmitting laser, and a large amount of oil drops and oil mist can refract and scatter light beams, so that the measurement accuracy is influenced.
In summary, for a complex oil mist measurement environment, the current valve motion law measuring device is difficult to apply, and a research and design is urgently needed in the field to obtain the valve motion law measuring device meeting the complex oil mist measurement environment.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides the engine valve motion law measuring device and method suitable for the complex oil mist environment, and aims to solve the problem that the existing measuring device is not suitable for realizing accurate measurement in the complex oil mist environment.
In order to achieve the above object, according to one aspect of the present invention, an engine valve motion law measuring device suitable for a complex oil mist environment is provided, which includes a laser displacement sensor, a fixed seat, a laser light path oil separation cover, a valve clamping block and a dynamic signal acquisition and analysis system, wherein the laser displacement sensor is installed on the fixed seat, and is used for emitting laser to vertically irradiate on a measuring surface of the valve clamping block, the laser is received by the laser displacement sensor again after being scattered on the measuring surface of the valve clamping block, and the received laser signal is converted into an electrical signal and transmitted to the dynamic signal acquisition and analysis system; the laser light path oil separation cover covers the outside of the laser displacement sensor, so that lubricating oil is prevented from splashing to the laser light path, and the lubricating oil splashed to the oil separation cover is guided to a specified area; the valve clamping block is arranged below a laser emitting head of the laser displacement sensor, a valve rod fixing hole is formed in the middle of the valve clamping block and used for installing the valve clamping block on a valve rod, a measuring surface located right below the laser displacement sensor is arranged at one end of the valve clamping block, and an oil separation plate and an oil discharge groove are further arranged between the valve rod fixing hole and the measuring surface; and the dynamic signal acquisition and analysis system is connected with the laser displacement sensor and is used for receiving the electric signal transmitted by the laser displacement sensor.
Preferably, the laser light path oil separation cover is provided with a mounting hole for mounting the laser light path oil separation cover outside the laser displacement sensor, the top surface of the laser light path oil separation cover is provided with a U-shaped hole for avoiding a data output cable of the laser displacement sensor, the lower end of the front surface of the laser light path oil separation cover is provided with an inclination so that lubricating oil splashed to the front surface of the oil separation cover flows downwards, and the bottom of the laser light path oil separation cover is provided with an oil guide groove with an inclination so that the lubricating oil flowing from the oil separation cover to the oil guide groove flows downwards to a set area.
Preferably, the valve clamping block is provided with a gap communicated with the valve rod fixing hole and a bolt fixing hole with the axis perpendicular to the axis of the valve rod fixing hole, so that after the valve clamping block is installed on the valve rod, the gap is closed by screwing a bolt penetrating through the bolt fixing hole, the valve clamping block is deformed, and the valve clamping block is stably and reliably fixed on the valve rod.
More preferably, the width of the slit is 3 to 6 mm.
Preferably, the periphery of the measuring surface is provided with an oil discharge chamfer for rapidly flowing away the lubricating oil splashed on the measuring surface.
Preferably, an oil separation plate is arranged between the measuring surface and the valve rod fixing hole, and the oil separation plate separates lubricating oil splashed to the measuring optical path and the measuring surface due to the fact that the valve rocker (or the valve bridge) impacts the valve.
More preferably, the oil discharge groove is provided between the measurement surface and the oil separation plate, and the oil discharge groove, the oil separation plate and the oil discharge chamfer together reduce oil film accumulation on the measurement surface.
Preferably, the fixing seat is provided with fixing seat mounting holes at the periphery thereof for fixing the fixing seat on the engine cylinder head, and the side surface thereof is provided with sensor mounting holes for mounting the laser displacement sensor.
According to another aspect of the invention, a method for measuring the motion law of an engine valve suitable for a complex oil mist environment is provided, which comprises the following steps:
1) installing the valve clamping block on the valve rod, installing a bolt and a nut, and screwing the bolt to close the gap so as to fix the valve clamping block on the valve rod;
2) mounting a fixed seat on an engine, covering a laser light path oil separation cover outside a laser displacement sensor, and mounting the laser displacement sensor at a corresponding position of the fixed seat so that laser emitted by the laser displacement sensor vertically irradiates on a measuring surface of a valve clamping block;
3) the method comprises the steps of starting an engine, a laser displacement sensor, a dynamic signal acquisition and analysis system and a computer connected with the dynamic signal acquisition and analysis system, starting to acquire an output signal of the laser displacement sensor after the working condition of the engine is stable, stopping acquiring and storing data after acquiring preset time, and obtaining the motion rule measurement of the engine valve by the computer according to the acquired data.
Further preferably, the method further comprises the following steps: 4) the working condition of the engine is changed, the output signals of the corresponding laser displacement sensors under different working conditions are collected, and the measurement of the motion law of the engine valve under different working conditions is realized.
Generally, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:
1. the measuring device is provided with the oil separation structure, and in the measuring process, the laser light path oil separation cover outside the laser displacement sensor can prevent lubricating oil from splashing to the laser light path, so that the refraction effect of lubricating oil droplets with larger diameters on the light path is avoided, and the precision of laser measurement is improved; meanwhile, the laser light path oil separation cover is provided with the inclination and the oil guide groove, so that lubricating oil splashed onto the oil separation cover can quickly flow away, lubricating oil mist in a measuring area is reduced, and the sensitivity of laser measurement is improved; the measures improve the measurement precision of the laser displacement sensor for measuring the valve lift rule or the valve motion rule in the real-machine running state of the engine, and provide a basis for high-precision online measurement of the engine valve motion rule in a complex oil mist environment.
2. The valve clamping block used as the laser displacement measuring surface is provided with the oil separating plate and the oil discharging groove, the oil separating and discharging structures can greatly reduce the quality of lubricating oil flowing to the measuring surface, and meanwhile, the measuring surface used for laser displacement measurement on the valve clamping block is provided with the oil discharging chamfer.
3. According to the invention, the valve clamping block can be stably and reliably arranged on the valve rod by arranging the gap structure, so that the stability, reliability and measurement precision of measurement are ensured.
Drawings
FIG. 1 is a main sectional view of an engine valve motion law measuring device suitable for complex oil mist environment according to an embodiment of the invention;
FIG. 2 is a side sectional view of an engine valve motion law measuring device suitable for complex oil mist environment according to an embodiment of the present invention;
FIG. 3 is a top view of the anchor block of the present invention;
FIG. 4 is a front view of the anchor block of the present invention;
FIG. 5 is a schematic diagram of the operation of the laser displacement sensor;
FIG. 6 is a structural view of the laser light path oil-separating cover of the present invention
FIG. 7 is a top view of the valve clamp block of the present invention;
fig. 8 is a front view of the valve clamping block of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1-2, an engine valve motion law measuring device suitable for a complex oil mist environment provided by an embodiment of the present invention includes a laser displacement sensor 2, a fixed seat 1, a laser light path oil separation cover 3, a valve clamp 4 and a dynamic signal acquisition and analysis system 6, wherein the laser displacement sensor 2 is installed on the fixed seat 1, the laser displacement sensor 2 is used for emitting laser to vertically irradiate on a measuring surface of the valve clamp 4, the laser is received by the laser displacement sensor 2 again after being scattered on the measuring surface of the valve clamp, and the received laser signal is converted into an electrical signal and transmitted to the dynamic signal acquisition and analysis system 6; the laser light path oil separation cover 3 covers the outside of the laser displacement sensor 2 to prevent lubricating oil from splashing to the laser light path; the valve clamping block 4 is arranged on the valve rod 5 and is arranged below the laser displacement sensor 2, and the dynamic signal acquisition and analysis system 6 is connected with the laser displacement sensor 2 and is used for receiving an electric signal transmitted by the laser displacement sensor.
As shown in fig. 3-4, the periphery of the bottom of the fixing seat 1 is provided with fixing seat mounting holes 1-1 for stably and firmly fixing the fixing seat on the engine cylinder head, the side surface of the sensor mounting hole is used as a mounting plane, sensor mounting holes 1-2 for stably and firmly fixing the laser displacement sensor 2 on the fixing seat are formed in the sensor mounting holes, and the laser displacement sensor 2 is mounted by utilizing the mounting plane and the sensor mounting holes, so that the laser emitted by the laser displacement sensor can be vertically projected onto the measuring plane of the valve clamping block. Specifically, the fixing base is an engine cylinder head cover or an engine cylinder head cover substitute structure, and the fixing base is installed above the engine cylinder head.
Fig. 5 is a working schematic diagram of a laser displacement sensor, and the laser displacement sensor 2 can be a conventional laser displacement sensor in the prior art, and the basic principle is that laser is emitted by a laser diode and scattered on a measuring surface of a valve clamping block, and the scattered laser is received by the laser displacement sensor again and then converted into an electric signal.
As shown in fig. 6, the laser light path oil separation cover 3 is installed on the laser displacement sensor to prevent the lubricant from splashing on the laser light path, thereby affecting the measurement accuracy, the laser light path oil separation cover should not interfere with the laser light path, the light path is protected as much as possible without interfering with other devices, in order to make the lubricant splashed on the laser light path oil separation cover flow out as soon as possible to prevent the lubricant mist from being generated, an oil guide structure is processed on the oil separation cover to guide the lubricant to a position where the laser measurement is not affected. Specifically, the side face of the laser light path oil separation cover 3 is provided with a mounting hole 3-1 for mounting the laser light path oil separation cover 3 on a laser displacement sensor, the top face of the laser light path oil separation cover is provided with a U-shaped hole 3-2 for avoiding a data output cable of the laser displacement sensor, the mounting hole 3-1 and the U-shaped hole 3-2 adopt a compatible design, the mounting requirement of the laser displacement sensor is met, the laser displacement sensor can be ensured to measure the lift of an air inlet valve and an air outlet valve in a proper mounting mode, the lower end of the laser light path oil separation cover is obliquely arranged so that lubricating oil splashed on the oil separation cover can rapidly flow downwards, the bottom of the laser light path oil separation cover is provided with a circle of oil guide grooves 3-3, and two ends of the oil guide grooves 3-3 are obliquely arranged so that the lubricating oil flowing.
Except the laser light path oil separation cover, according to the actual structure of the engine, oil separation and dredging processing are carried out on the oil outlet with larger flow of lubricating oil, and the phenomenon that the lubricating oil is sprayed out to collide with other parts to form splashed lubricating oil drops under the high-speed working condition to influence the measurement of the laser displacement sensor is avoided.
As shown in fig. 7-8, a valve rod fixing hole 4-1 is formed in the middle of the valve clamping block 4 for mounting the valve clamping block 4 on a valve rod 5, a measuring surface 4-2 located right below the laser displacement sensor 2 is arranged at one end (for example, the right end) of the valve clamping block 4 for projecting laser to measure the valve lift, an oil separation plate 4-3 is arranged between the valve rod fixing hole 4-1 and the measuring surface 4-2, an oil discharge groove 4-6 is arranged in a region between the oil separation plate 4-3 and the measuring surface 4-2, and the oil separation plate 4-3 is used for isolating lubricating oil which splashes to a measuring light path and a measuring plane due to the impact of a valve rocker (or a valve bridge) on the valve rod.
The measuring surface and the side of the valve rod fixing hole are separated by an oil separation plate 4-3 and an oil unloading groove 4-6, so that lubricating oil for lubricating the top of the valve is prevented from splashing to the measuring surface from the side of the valve rod fixing hole, wherein chamfers are formed on the periphery of the measuring surface, a small amount of lubricating oil splashing to the measuring surface can quickly flow out of the oil unloading groove 4-6, the influence of oil accumulation on laser measurement is reduced, and the measuring precision is improved. In order to ensure the reliable connection of the valve clamping block 4 and the valve stem 5, the valve clamping block 4 is further provided with a gap 4-4 with a width of 3-6mm and a bolt fixing hole 4-5, the gap 4-4 is positioned at the other end (for example, the left end) of the valve clamping block 4, the gap 4-4 is communicated with the valve stem fixing hole 4-1, the gap 4-4 is opened in the same direction as the valve stem fixing hole 4-1, the axis of the bolt fixing hole 4-5 is perpendicular to the axis of the valve stem fixing hole 4-1, the bolt fixing hole 4-5 is a through hole which penetrates through the valve clamping block and is processed at both sides of the gap, the through hole is used for installing a bolt, so that the valve clamping block is installed on the valve stem and then is provided with a bolt and a nut, the gap 4-4 is closed by screwing the bolt which penetrates through the bolt fixing hole 4-5, the closing of the gap deforms the valve stem retaining hole 4-1, and the deforming force holds the valve stem retaining hole and the valve stem together to securely mount the valve clamp to the valve stem.
Specifically, the dynamic signal acquisition and analysis system 6 is used for receiving the electrical signal transmitted by the laser displacement sensor, obtaining the required data and performing data processing, which is not the key point of the present invention, and the existing signal acquisition and analysis system is adopted, that is, the existing signal acquisition and analysis system is suitable for the present invention. In order to meet the acquisition requirement of the high-speed motion law signal of the valve, the dynamic signal acquisition and analysis system can at least meet the sampling frequency of 20KHZ, in order to filter out the high-frequency vibration part contained in the output signal, the dynamic signal acquisition and analysis system can carry out low-pass filtering operation, in order to obtain the valve speed and the valve acceleration signal from the valve lift signal, the dynamic signal acquisition and analysis system can carry out differential operation. In addition, the dynamic signal acquisition and analysis system also has the functions of signal display, data storage and output and the like.
The measuring device for the motion law of the engine valve comprises the following specific measuring steps:
1) installing the valve clamping block 4 on the valve rod 5, installing a bolt and a nut, screwing the bolt to close the gap, and stably and firmly fixing the valve clamping block 4 on the valve rod 5;
2) the method comprises the following steps of putting a fixed seat 1 on a corresponding position of an engine (such as a single-cylinder four-stroke diesel engine), stably and firmly fixing the fixed seat 1 on the engine through a fixed seat mounting hole by using a bolt, covering a laser light path oil separation cover 3 on the outer part of a laser displacement sensor 2, then installing the laser displacement sensor 2 on the fixed seat 1, connecting the laser displacement sensor 2 to a dynamic signal acquisition and analysis system, electrifying, adjusting the position of the laser displacement sensor 2, enabling laser to vertically irradiate a measuring surface of a valve clamping block 4, and fixing the laser displacement sensor;
3) starting a dynamic signal acquisition and analysis system and a computer connected with the dynamic signal acquisition and analysis system, setting parameters such as the conversion relation between a laser displacement sensor output voltage signal and displacement, adding a low-pass filtering module to remove high-frequency vibration of the signal, adding a first-order integration module to obtain a valve speed signal, and adding a second-order integration module to obtain a valve acceleration signal;
4) checking an engine experiment bench to ensure that each part is firmly installed, works normally and has no physical interference, and preparing before starting up experiments;
5) the working condition of the engine is set, the engine is started, the output signal of the laser displacement sensor is collected after the working condition of the engine is stable, the collection is stopped and the data is stored after the output signal is collected for a period of time according to the requirement, the measured data is noticed all the time in the data collection process, and if unusual data are generated, the experiment is stopped immediately, the reason is found and the problem is solved.
6) Changing the experiment working condition according to the requirement, acquiring the valve lift signal under different working conditions, closing the engine after the experiment is finished, checking the states of the tool and the sensor and maintaining.
In a word, the measurement of the valve motion rule in the actual engine running state of the engine has important guiding value for the design of the valve actuating mechanism. However, in the actual engine operating state, the cylinder head cover contains a large amount of lubricating oil drops and oil mist, and the oil drops and the oil mist have great influence on the measurement accuracy of the valve lift rule or the valve motion rule online measurement by adopting an optical method. The measuring device is provided with the oil separation and oil discharge device for the laser measuring light path, the laser light path oil separation cover can prevent lubricating oil from splashing to the laser light path in the measuring process, the chute is designed in the valve clamping block used as the laser displacement measuring surface, oil can be quickly discharged through the structure to prevent oil from being accumulated on the measuring surface, the oil separation and discharge structures can greatly improve the measuring precision of the valve lift rule or the valve motion rule measured by the laser displacement sensor, a foundation is provided for high-precision online measurement of the engine valve motion rule in a complex oil mist environment, and the engine valve lift rule or the motion rule in the complex oil mist environment can be measured in a real machine.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. The utility model provides an engine valve motion law measuring device suitable for complicated oil mist environment, its characterized in that, includes laser displacement sensor (2), fixing base (1), laser light path oil removal cover (3), valve clamp splice (4) and dynamic signal acquisition analytic system (6), wherein:
the laser displacement sensor (2) is arranged on the fixed seat (1) and used for emitting laser to vertically irradiate on the measuring surface of the valve clamping block (4), the laser is scattered on the measuring surface of the valve clamping block and then received by the laser displacement sensor (2), and the received laser signal is converted into an electric signal and transmitted to the dynamic signal acquisition and analysis system (6); the laser light path oil separation cover (3) covers the laser displacement sensor (2) to prevent lubricating oil from splashing to the laser light path and guide the lubricating oil splashed to the oil separation cover, so that lubricating oil drops and lubricating oil mist are prevented from being generated in the laser light path;
the laser light path oil separation cover (3) is provided with a mounting hole (3-1) for mounting the laser light path oil separation cover (3) outside the laser displacement sensor, the top surface of the laser light path oil separation cover is provided with a U-shaped hole (3-2) for avoiding a data output cable of the laser displacement sensor, the lower end of the front surface of the laser light path oil separation cover is provided with an inclination so that lubricating oil splashed onto the oil separation cover flows downwards, and the bottom of the laser light path oil separation cover is provided with an oil guide groove (3-3) with an inclination so that the lubricating oil flowing from the oil separation cover to the oil guide groove flows downwards;
the valve clamping block (4) is arranged below the laser displacement sensor (2), a valve rod fixing hole (4-1) is formed in the middle of the valve clamping block and used for installing the valve clamping block (4) on a valve rod (5), a measuring surface (4-2) located right below a laser emitting head of the laser displacement sensor (2) is arranged at one end of the valve clamping block, an oil discharging chamfer is arranged on the periphery of the measuring surface (4-2), an oil separating plate (4-3) and an oil discharging groove (4-6) are arranged between the valve rod fixing hole (4-1) and the measuring surface (4-2), a gap (4-4) communicated with the valve rod fixing hole (4-1) is formed in the valve clamping block (4), and a bolt fixing hole (4-5) with the axis vertical to the axis of the valve rod fixing hole (4-1) is further formed in the valve clamping block (4), so that the valve clamping block (4) penetrates through the bolt fixing hole (4-1) by screwing after being installed on the valve rod (4-5) closing the gap (4-4) by the bolt to deform the valve clamping block (4) so as to stably and reliably fix the valve clamping block (4) on the valve rod (5), wherein the oil unloading groove (4-6) is formed between the measuring surface (4-2) and the oil separating plate (4-3), and the oil unloading groove (4-6), the oil separating plate (4-3) and the oil unloading chamfer together reduce oil film accumulation on the measuring surface (4-2);
and the dynamic signal acquisition and analysis system (6) is connected with the laser displacement sensor (2) and is used for receiving the electric signal transmitted by the laser displacement sensor.
2. The engine valve motion law measuring device applied to the complex oil mist environment according to claim 1, wherein the width of the gap (4-4) is 3-6 mm.
3. The engine valve motion law measuring device applicable to the complex oil mist environment according to claim 1, wherein the fixing seat (1) is provided with fixing seat mounting holes (1-1) at the periphery for fixing the fixing seat on the engine cylinder cover, and the side surface is provided with sensor mounting holes (1-2) for mounting the laser displacement sensor (2).
4. A method for measuring the motion law of an engine valve applicable to a complex oil mist environment, which is realized by using the measuring device according to any one of claims 1 to 3, and is characterized by comprising the following steps:
1) installing the valve clamping block (4) on the valve rod (5), installing a bolt and a nut, and screwing the bolt to close the gap so as to fix the valve clamping block (4) on the valve rod (5);
2) the method comprises the following steps of installing a fixed seat (1) on an engine, covering a laser light path oil separation cover (3) on the outer portion of a laser displacement sensor (2), and then installing the laser displacement sensor (2) at the corresponding position of the fixed seat (1) so that laser emitted by the laser displacement sensor (2) perpendicularly irradiates on a measuring surface of a valve clamping block (4);
3) the method comprises the steps that an engine, a laser displacement sensor (2), a dynamic signal acquisition and analysis system (6) and a computer connected with the dynamic signal acquisition and analysis system (6) are started, when the working condition of the engine is stable, the output signal of the laser displacement sensor starts to be acquired, the acquisition is stopped after preset time is acquired, data are stored, and the computer obtains the measurement of the motion rule of the engine valve according to the acquired data.
5. The method for measuring the valve motion law of the engine suitable for the complex oil mist environment according to the claim 4, further comprising the following steps: 4) the working condition of the engine is changed, the output signals of the corresponding laser displacement sensors under different working conditions are collected, and the measurement of the motion law of the engine valve under different working conditions is realized.
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| US8240913B2 (en) * | 2008-09-24 | 2012-08-14 | General Electric Company | Fiber optic sensing device and method |
| CN102538628A (en) * | 2011-12-18 | 2012-07-04 | 奇瑞汽车股份有限公司 | Valve lift measuring device |
| CN206054011U (en) * | 2016-08-31 | 2017-03-29 | 大唐黄岛发电有限责任公司 | A kind of bearing box of steam turbine oil-proof device |
| CN106482956A (en) * | 2016-12-08 | 2017-03-08 | 广西玉柴机器股份有限公司 | The test device of valve motion rule |
| CN108759716A (en) * | 2018-06-05 | 2018-11-06 | 安徽沃德气门制造有限公司 | A kind of valve detection device |
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2018
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