CN107388931B - Valve characterization processes and its air valve total length detection method - Google Patents

Valve characterization processes and its air valve total length detection method Download PDF

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Publication number
CN107388931B
CN107388931B CN201710850867.XA CN201710850867A CN107388931B CN 107388931 B CN107388931 B CN 107388931B CN 201710850867 A CN201710850867 A CN 201710850867A CN 107388931 B CN107388931 B CN 107388931B
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detection
valve stem
engine valve
total length
valve
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CN107388931A (en
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张军
李世春
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Yangtze Normal University
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Yangtze Normal University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00Measuring arrangements characterised by the use of mechanical means
    • G01B5/003Measuring of motor parts
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00Measuring arrangements characterised by the use of mechanical means
    • G01B5/02Measuring arrangements characterised by the use of mechanical means for measuring length, width or thickness
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00Measuring arrangements characterised by the use of mechanical means
    • G01B5/24Measuring arrangements characterised by the use of mechanical means for measuring angles or tapers; for testing the alignment of axes
    • G01B5/25Measuring arrangements characterised by the use of mechanical means for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes

Abstract

The invention discloses a kind of air valve total length detection methods, it is characterized in that, first preparing a length is the air valve total length detection standard specimen that air valve total length detects margin of tolerance minimum value, then it is vertically fixed on an engine valve stem positioning seat, using a valve length detection amesdial, so that its detector lower end is detected standard specimen upper end face contact with air valve total length straight down and is adjusted and be zeroed and fix height and position;Then it removes air valve total length detection standard specimen and changes valve to be detected, detect end in contact under the detector of the upper end end face and valve length detection amesdial, read valve length detection amesdial reading, air valve total length numerical value to be detected can be conversed.The invention also discloses a kind of valve characterization processes using above-mentioned air valve total length detection method.The advantages that present invention can be realized the detection of air valve total length parameter and engine valve stem straightness, have implementation simply, easy to operate, and testing result is accurate and reliable.

Description

Valve characterization processes and its air valve total length detection method
Technical field
Part of automobile engine production detection technique field of the present invention more particularly to a kind of valve characterization processes and its gas Men overall length detection method.
Background technique
Automobile engine can be converted into mechanical energy by the chemical energy of fuel or by other forms, provide for automobile dynamic Power is the heart of automobile, belongs to a kind of technology-intensive product.With China's expanding economy, to automobile demand amount and day While all increasings, auto industry is rapidly developed, and people are also higher and higher to the performance requirement of automobile engine.
In automobile engine, inlet and exhaust valve is to be coaxially disposed the bar portion being integrated with round plate by a round plate and one The component of composition belongs to one of automobile engine key components and parts, is the portal of engine chamber, is engine working process The key foundation part of middle sealing porting controls the gas exchanges of engine for blocking airflow channel.In engine In each course of work, intake and exhaust valves are all respectively opened and closed once when valve opens and closes, and valve is born The pressure of valve spring and pressure when taking a seat.Intake and exhaust valves play close especially in compression and expansion stroke Seal the effect of combustion chamber.Therefore, the quality of valve quality has important influence to engine performance and service life.
The machining accuracy and structure of valve play the role of to the movement of engine valve actuating mechanism it is very important, while wherein The overall dimensions of valve are the key parameters of valve, it is both design basis and technique and detection benchmark, it is almost and valve All sites precision has substantial connection.Traditional air valve total length detection mode needs manually to use vernier caliper by a large amount of It completes, allows for the subsequent facet of cutting edge and valve big end face contact before slide calliper rule in this way, measurement result is exactly a plane To the distance of straight line.Since valve large end face is not processed or machining accuracy is low, surface shape error is big, so that measurement As a result there are errors with valve physical length.Therefore existing detection technique, testing cost high efficiency is low, and vulnerable to operator Factor influence, be easy to easily cause the unstability of detection due to human eye vision fatigue, increase the error rate of product.It is difficult to meet The product quality requirement of continuous improvement.
In addition, engine valve stem refers to that a part to work in valve guide bushing, the direct shadow of quality of bar portion straightness Ring the normal work of valve.In process of factory production, engine valve stem straightness has the technique being straightened to it to be subject to Guarantee.And in existing valve manufacturing enterprise, some valve manufacturing enterprises are straight to engine valve stem mainly by universal tool-measuring microscope Dimension is detected.Because of its inspection cost height, required time is long, therefore examines engine valve stem straightness and number and batch very It is limited, directly think that the technique for having alignment is guaranteed.Enterprise without universal tool-measuring microscope is typically no to this Mesh is detected.
Summary of the invention
The technical problem to be solved in the present invention is that: how to provide it is a kind of implement it is simple, it is easy to operate, can be realized The detection of air valve total length parameter, and testing result accurately and reliably air valve total length detection method;Include the present invention also provides a set of The valve characterization processes of above-mentioned air valve total length detection method, make it that can also realize the detection of engine valve stem straightness, and have It is easy to operate, the accurate and reliable feature of detection structure.
In order to solve the above-mentioned technical problem, present invention employs the following technical solutions.
A kind of air valve total length detection method, which is characterized in that first prepare an air valve total length detection standard specimen, air valve total length inspection The length of mark sample is valve length when air valve total length detects margin of tolerance minimum value, then by air valve total length detection standard specimen Bar portion is downwardly vertical to be fixed on an engine valve stem positioning seat, using a valve length detection amesdial, makes its detector Lower end detects standard specimen upper end face contact with air valve total length straight down and adjusts zero, fixes valve length detection amesdial institute In height and position;Then air valve total length detection standard specimen is removed, keeps valve length detection amesdial position constant, it will be to be detected The bar portion of valve is downwardly vertical to be fixed in engine valve stem locating slot, and the inspection of the upper end end face and valve length detection amesdial is made End in contact detects under gauge head, reads valve length detection amesdial reading, can be changed according to the length that air valve total length detects standard specimen Calculate air valve total length numerical value to be detected.
In this way, have many advantages, such as it is easy to operate, it is easy to detect quick reliable accurate.
As optimization, realized in this method using valve device for detecting length below, the valve device for detecting length, Pedestal including cuboid structure is provided with the vertical positioning fixture of engine valve stem and air valve total length testing agency, valve on pedestal The vertical positioning fixture of bar portion includes the engine valve stem positioning seat for being set on the base surface, engine valve stem positioning seat upper surface The engine valve stem locating slot opened up straight up with one, engine valve stem locating slot are determined for realizing the upward of engine valve stem Position;Air valve total length testing agency includes the guide rod for being fixed at base upper surface vertically, is movably socketed outside guide rod There is a sleeve, the direction that engine valve stem positioning seat is faced outside sleeve is fixedly connected with an installation support arm horizontally outward, installs A valve length detection amesdial, valve length detection amesdial are provided with above the face engine valve stem positioning seat of support arm outer end Detector straight down face engine valve stem locating slot be arranged;Height adjustment mechanism is additionally provided between sleeve and guide rod, Height adjustment mechanism can be realized the height and position of sleeve on the guide bar and adjust.
In this way, first preparing an air valve total length detection standard specimen, the length that air valve total length detects standard specimen is that valve is total when detection Valve length when long detection margin of tolerance minimum value, it is then that the bar portion of air valve total length detection standard specimen is downwardly vertical fixed to gas In door rod portion locating slot, height adjustment mechanism is adjusted, so that the detector lower end of valve length detection amesdial and air valve total length Detection standard specimen upper end face contact simultaneously adjusts zero;Then air valve total length detection standard specimen is removed, valve length detection amesdial is kept Position is constant, and the bar portion of valve to be detected is downwardly vertical fixed in engine valve stem locating slot, keeps the upper end end face gentle End in contact detects under the detector of door length detection amesdial, reads valve length detection amesdial reading, can be according to valve The length of overall length detection standard specimen converses air valve total length numerical value to be detected.Therefore above-mentioned valve device for detecting length can facilitate reality Existing air valve total length detection, and have structure simple, it is easy to operate, detect the advantages that reliable.Wherein pedestal is cuboid knot Structure facilitates manufacture to process, while can match with subsequent installation arm length direction, has its entirety simple and compact for structure The characteristics of.
As optimization, it is vertically provided with amesdial mounting hole in the middle part of the installation support arm, amesdial mounting hole aperture is gentle The detection bar fixed part outer diameter of door length detection amesdial is consistent and by the detection bar fixed part of valve length detection amesdial Divide sandwiched in the inner, is vertically provided with one in the middle part of the installation support arm on the outside of amesdial mounting hole and cracks, support arm will be installed by cracking Outer half section is divided into left half arm and right half arm, is vertically connected with fastening screw in the horizontal direction between left half arm and right half arm Realize the fastening to the detection bar fixed part of valve length detection amesdial.
In this way, structure is simple and the installation of realization valve length detection amesdial is facilitated to fix.
As optimization, the height adjustment mechanism includes a height adjustment bolt, the nut of the height adjustment bolt Part and sleeve, which are coaxially disposed and can install with horizontally rotating, is connected to sleeve upper end, coaxially sets in the middle part of the guide rod upper surface It is equipped with height adjustment threaded hole straight down, the height adjustment bolt is threadedly engaged in height adjustment threaded hole.
In this way, need to only rotate height adjustment bolt, its being threadedly engaged between height adjustment threaded hole can be passed through Height and position where changing height adjustment bolt, and then band moving sleeve realizes that upper-lower height is adjusted together.It is simple with structure, it adjusts Save the advantages that convenient and efficient reliable.
As optimization, the nut portion upper surface of the height adjustment bolt vertically offers the adjustment hole of regular polygon.
It realizes in this way, facilitating and being inserted into the corresponding spanner that adjusts to the height adjustment of height adjustment bolt, keeps its structure simple The compact mounting height for not influencing to interfere amesdial, and it is easy to adjust.
As optimization, the rotation that limit is circumferentially rotated for sleeve is provided between the sleeve lining and guide rod outer wall Position limiting structure.
In such manner, it is possible to limit rotating in a circumferential direction for sleeve, avoid when sleeve height is adjusted because sleeve transfers to have an impact certainly.
As optimization, the rotary position limiting structure includes the vertical guiding raised line that evagination is formed in guide rod outer wall, It further include the vertical guide groove positioned at sleeve lining and cooperation on vertically guiding raised line.
In this way, having structure simple, it is oriented to reliable advantage.
As optimization, height location structure is additionally provided on the sleeve, height location structure is for realizing sleeve height Being locked after adjusting.
In this way, can be locked by height location structure realization after sleeve height adjusting.It avoids in detection process Sleeve height, which is touched, to change and influences detection accuracy.It can better ensure that detection is accurate reliable.
Further, the height location structure, including an altitude location bolt, altitude location bolt it is horizontally disposed and Cooperate on sleeve in a horizontal positioning bolt hole for running through setting, altitude location bolt inner end is connected on guide rod outer wall Realization is locked to sleeve portion.
In this way, having many advantages, such as that structure is simple, it is locked easy to operate reliable.
As optimization, base upper surface is additionally provided with the positioning seat sliding slot an of strip, the engine valve stem positioning seat Lower end is slidably fit into positioning seat sliding slot, and one end of positioning seat sliding slot is the piece installing end for being packed into valve to be detected, The installation support arm is fallen in except piece installing end in the vertical projection of base upper surface, and the positioning seat sliding slot other end is that face valve is long Spend the test side below detection micrometer.
In this way, when making detection, when valve length detection amesdial adjusts height position by air valve total length detection standard specimen After setting and fixing and adjust zero, engine valve stem positioning seat first can be slided into piece installing end along the chute, in the realization pair of piece installing end Air valve total length detects the disassembly of standard specimen and the vertical installation of valve to be detected is fixed, and then moves engine valve stem positioning seat edge again Sliding slot, which slides into test side, detects end in contact under the detector of the gentle door length detection amesdial in end face thereon, and it is long to read valve Detection micrometer reading is spent, air valve total length numerical value to be detected can be conversed according to the length that air valve total length detects standard specimen.Therefore In such manner, it is possible to which more convenient realize the installation and detection for treating detection means, avoid component installation fixation procedure to testing result Influence, preferably raising detection accuracy and reliability.
Further, positioning seat track length direction is consistent with the installation length direction of support arm.In this way, its structure can be made It is more compact, the area of pedestal is reduced, consumptive material is saved.
Further, engine valve stem positioning seat lower end is cylinder, the piece installing end of the positioning seat sliding slot and detection End is diameter and the matched semicircle of engine valve stem positioning seat lower end cylinder diameter.Positioning seat sliding slot more convenient in this way is sliding Fitting positioning after moving in place.
As optimization, detection reset spring is provided in the positioning seat sliding slot along its length, detects reset spring one End and the test side of positioning seat sliding slot abut, and the other end is connected with engine valve stem positioning seat lower end and supports engine valve stem positioning seat It connects at the piece installing end of positioning seat sliding slot.
In this way, being at the uniform velocity moved to test side by manpower when detecting after engine valve stem positioning seat piece installing realizes detection, guarantee inspection Survey stability, need to only loose one's grip after detection, engine valve stem positioning seat can in the case where detecting action of reset spring quick sliding to piece installing end, Realize inloading part piece installing, it is very convenient quick, guarantee that detection is reliable and stable and improves dress and changes part efficiency.
Further, the detection reset spring is helical spring, under the test side end wall and engine valve stem positioning seat Corresponding detection reset spring is provided with spring mounting hole on the wall of end side, and the both ends insertion of the detection reset spring is mounted on bullet In spring mounting hole.It can be convenient in this way and realize that the installation of helical spring is fixed, improve assembly efficiency and be conducive to dismounting and change.
Still further, the detection is multiple when engine valve stem positioning seat lower end is located at the test side of positioning seat sliding slot Position spring can be compressed into two spring mounting holes and connect in the space to be formed, so that engine valve stem positioning seat lower end side and fixed The test side inner wall of position seat sliding slot is affixed.It can preferably realize in this way by test side inner wall to the accurate fixed of detection position Position realizes the installation settings of detection reset spring not only to improve detection efficiency, but also avoids influence of the positioning accuracy by spring, It ensure that detection was not only quick and convenient but also reliable and stable.
As optimization, there is the engine valve stem locating slot slot bottom one to be realized determining for positioning for contacting with valve bottom end Plane, engine valve stem locating slot notch position are provided with a circle for realizing the elastomeric element clamped to engine valve stem.
In this way, valve position when, engine valve stem lower end squeeze elastomeric element, and be inserted into engine valve stem locating slot slot bottom and Face contact is positioned, is clamped in this way by elastomeric element, can better ensure that and the precision of valve positioning in the height direction is wanted It asks, valve end outer dimension error is avoided to impact the precision in positioning height direction, ensure that the accuracy of detection.
Further, the elastomeric element be fixed at engine valve stem locating slot notch one circle rubber material obtain It arrives.In this way, structure is simple, it is conducive to setting, low in cost and resilient clamp is reliable and stable.
The invention also discloses a kind of valve characterization processes, includes the steps that realizing air valve total length detection and realize valve stem The step of portion's Linearity surveying, is realized when realizing air valve total length detection using air valve total length detection method as described above;It realizes When engine valve stem Linearity surveying, engine valve stem to be detected is positioned on two positioning surfaces of two sections of location structures, then Pushing down engine valve stem makes it form the line contact along two parallel lines with two positioning surfaces respectively, reserves between two sections of location structures For the detection notch of detection, connect its test side from detection gap position and engine valve stem peripheral surface using digital dial gauge Certain precompressed amount is touched and generated, digital dial gauge is then fixed;The line of engine valve stem and two positioning surfaces is kept to connect at this time While touching, engine valve stem is pulled along engine valve stem length direction, then observes the variable quantity of digital dial gauge, is i.e. detection obtains The straightness data of engine valve stem.
In this way, this technique can either realize the detection to air valve total length, and facilitate the inspection realized to engine valve stem straightness It surveys, is to form each two with location structure at left and right sides of engine valve stem test point position when to the detection of engine valve stem straightness The positioning of bar line contact, this avoid surface of position out-of-flatnesses at valve stem positioning to influence caused by Linearity surveying, mentions High detection accuracy and reliability.
As optimization, engine valve stem Linearity surveying is realized using engine valve stem linearity testing apparatus below, it is described Engine valve stem linearity testing apparatus includes bottom block, and valve positioning fixture and the inspection of engine valve stem straightness are provided on bottom block Mechanism is surveyed, the valve positioning fixture includes the location structure of two sections of one length directions of following wind setting, and every section of location structure includes Two intersections are in the positioning surface of angle, and two positioning surfaces of two location structures respectively can be used in being formed with valve stem with always Line on line contacts, and the position between two sections of location structures is formed with a detection notch;The engine valve stem Linearity surveying Mechanism includes an engine valve stem Linearity surveying digital dial gauge, and digital dial gauge has a cooperation section, and cooperation section is matched Close in the matching hole on an amesdial matching seat for being set to bottom block, it is described be combined into can along digital dial gauge detect The sliding of pole length direction is slidably matched, and is additionally provided on amesdial matching seat to thousand points of number of engine valve stem Linearity surveying The amesdial fixed structure that table is fixed, digital dial gauge detection bar is perpendicular to the valve stem direction of axis line after positioning and just To detection gap position setting, and digital dial gauge detection bar front end is formed with a test side, which is used for and positions Detection is realized in valve stem peripheral surface contact afterwards.
In this way, engine valve stem to be detected can be positioned at two sections in the detection of engine valve stem linearity testing apparatus On two positioning surfaces of location structure, then pushing down engine valve stem makes it form line contact with two positioning surfaces respectively, then adjusts Digital dial gauge position contacts its test side from detection gap position and engine valve stem peripheral surface and generates certain precompressed Then amount fixes digital dial gauge by amesdial fixed structure.The line of engine valve stem and two positioning surfaces is kept to connect at this time While touching, engine valve stem is pulled along engine valve stem length direction, the variable quantity of digital dial gauge is then observed, can be detected To the straightness data of engine valve stem;Therefore the feature simple, easy to operate with structure.Further, matching hole can be horizontal Setting, with more convenient adjusting detection.
As optimization, valve positioning fixture includes the first locating piece and the second locating piece of whole rectangular-blocklike structure, First locating piece and the second locating piece horizontal direction fitting be arranged and be fixed to bottom block on make the first locating piece upper surface and The fitting side side of second locating piece forms described two positioning surfaces, and the detection notch is by the first locating piece and the second locating piece The groove of upper surface obtains.
Make its structure simple in this way, the processing and installation of conveniently positioning structure is formed, and makes to be formed level side To two positioning surfaces of a vertical direction, two positioning surfaces are mutually perpendicular to, and keep its positioning reliable, mutual alignment relation precision can It leans on.
As optimization, valve positioning fixture further includes a third locating piece, and the third locating piece is fixed by screw On bottom block, third locating piece upper surface is provided with the locating slot that an entirety is in cuboid structure, and locating slot ground is water The locating piece datum level of flat setting positions groove width and the first locating piece and the second locating piece along perpendicular to it and is bonded side side side To the sum of width it is consistent so that the first locating piece and the second locating piece are located in locating slot, the first locating piece and second fixed Position block bottom surface and the fitting of locating piece datum level, locating slot are located at the overhead surface of one side position of digital dial gauge lower than the first positioning Block upper surface location.
In this way, need to only be fixed by the installation that screw completes third locating piece when assembly, then by the first locating piece and the Clamping is packed into locating slot after the fitting of two locating pieces, installs very convenient quick, and the first locating piece and the second locating piece Rigging error can determine by the cooperation between third locating piece, can more convenient reduction mismatch error, greatly improve Detection accuracy.
It further include engine valve stem pressing device as optimization, engine valve stem pressing device includes an elastic component and sets An applicator member on elastic component is set, applicator member is located on the direction of two positioning surface angle faces and in elastic structure Engine valve stem peripheral surface under the effect of part elastic force and after positioning, which contacts, to be compressed.
Facilitate in this way and replaces manpower to apply a pressure pair from the direction of two positioning surface angles of face by pressing device Engine valve stem after positioning, which is realized, to be compressed, and when itself and two positioning surfaces being made to form line contact, in this way detection operation, manually only needs to control System pulls engine valve stem to be axially moveable.Operator can be preferably liberated, better ensures that detection accuracy.
As optimization, elastic component is the elastic press of angularly disposed strip, and elastic press lower end is fixed on one It is installed in a briquetting mounting base of bottom block, the applicator member is installed in elastic press upper end.
In this way, structure is simple and quick and easy for installation, it is easy to implement.
As optimization, curved arc, elastic press upper center extend forward along the length direction under being in the middle part of elastic press It is formed with installation shaft, the applicator member is the roller body being rotatably engaged in installation shaft, roller body peripheral surface Compression is realized for forming point contact with engine valve stem peripheral surface after positioning.
In this way, forming rolling friction using roller body as applicator member to improve the smoothness of detection, while roller body Compared to roll structure, while itself more convenient assembly, additionally it is possible to preferably facilitate realization circumferential to engine valve stem after positioning The point contact on surface compresses, and after forming point contact compression, can preferably reduce influence of the compaction process itself to detection accuracy.
Further, engine valve stem pressing device is along engine valve stem length direction spacing parallel arranging is arranged after positioning two It is a, while digital dial gauge test side face is located between the applicator member of two engine valve stem pressing devices.In this way, forming position It is gentle also to can be better maintained balance for two compression points in digital dial gauge two sides while capable of preferably keeping compression Door rod moves flexibility, preferably avoids engine valve stem from beating by pressing device, improves detection accuracy.
As optimization, the cooperation section is formed on the detection rod rear end fixed part of digital dial gauge, the amesdial Fixed structure includes the amesdial fixing screws being arranged on amesdial matching seat that are screwed on, and the amesdial fixing screws are just To on amesdial matching seat matching hole setting and front end be used for and matching hole in detection bar peripheral surface contact realize fix.
In this way, having structure simple, facilitate implementation, and digital dial gauge be slidably matched and fix it is convenient and reliable etc. excellent Point.
As optimization, it is fixedly installed a lengthening on the active segment of digital dial gauge detection bar front forward in the axial direction Block, lengthening block front end are provided with a detection ball and form the test side.
In this way, can preferably extend the length of detection bar, it is made smoothly to realize detection, while can be convenient for difference The correspondence size of the engine valve stem adjustment detection ball of model, makes it more smoothly realize detection, improves detection reliability.
It as optimization, lengthens and is provided with vertical crack in the middle part of block front half section along its length, crack makes before lengthening block It is integrally formed in the front end surface of half section of left front half section of formation and right front half section, the left front half section and right front half section and is used for and examines Survey the detection ball mounting groove that installation is realized in ball surface fitting.
In this way, because detection ball mounting groove notch, which is generally, is equal to or slightly less than the spherical with energy of detection ball diameter Enough clamp detection ball, therefore crack will lengthen after block front half section is separated to form left front half section and right front half section, it can be by a left side The elasticity of front half section and right front half section itself facilitates the insertion installation of detection ball.
Also there is one rounded extended region space is expanded to two sides as optimization, at crack inner end.
In this way, the position of left front half section and right front half section generation flexible deformation is in rear end when making installation detection ball Extended area spatial position, front end restores and remains that detection circle can be clamped after capable of better ensuring that detection ball installation The state of ball avoids left front half section and right front half section front end from generating influence of the flexible deformation to detection accuracy, improves detection accuracy.
Further, lengthening has a detection bar pilot hole being arranged along its length, detection bar in the middle part of block rear end face Pilot hole front end and the extended area space of crack communicate, and digital dial gauge detection bar front end movable part is fixedly mounted on detection In bar pilot hole, and detection bar front end end is exposed to the extended area space of crack.In this way, can be convenient detection bar pilot hole And the assembly and alignment between block are lengthened, to improve detection accuracy.
Further, lengthening block rear end upper surface, which is screwed on, is provided with detection bar fixing bolt, detection bar fixing bolt front end Fixation is realized for contacting with digital dial gauge detection bar front end movable part.In this way, structure is simple, and to detection bar fixation side It can lean on.
Further, left front half section and right front half section, which extend transversely through to be screwed on to be provided with before, lengthens block fixing bolt.In this way, After the loading for completing detection ball, it can realize to left front half section and right front half section front end by block fixing bolt is lengthened along a left side The limitation of right propagation direction flexible deformation thoroughly prevents it from generating influence of the flexible deformation to detection accuracy.
In conclusion the present invention can be realized the detection of air valve total length parameter and engine valve stem straightness, has implementation Simply, easy to operate, the advantages that testing result is accurate and reliable.
Detailed description of the invention
Fig. 1 is the structure schematic diagram of the valve device for detecting length used in embodiment of the present invention, base portion in figure It is divided into section view status display.
Fig. 2 is the schematic perspective view of Fig. 1.
Fig. 3 is the structural representation of the overlook direction of the engine valve stem linearity testing apparatus used in embodiment of the present invention Figure.
Fig. 4 is the schematic perspective view of Fig. 3.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
Embodiment: a kind of valve characterization processes include the steps that realizing air valve total length detection and realize engine valve stem straight line The step of degree detection.
When realizing air valve total length detection, using air valve total length detection method below, it is characterized in that, first prepare a gas Men overall length detects standard specimen, and the valve that air valve total length detects when the length of standard specimen is air valve total length detection margin of tolerance minimum value is long Degree, then by air valve total length detection standard specimen bar portion it is downwardly vertical be fixed on an engine valve stem positioning seat, using a gas Door length detection amesdial makes its detector lower end detect standard specimen upper end face contact with air valve total length straight down and adjust and returns Zero, fix height and position where valve length detection amesdial;Then air valve total length detection standard specimen is removed, valve length is kept Detection micrometer position is constant, and the bar portion of valve to be detected is downwardly vertical fixed in engine valve stem locating slot, makes thereon It holds end in contact under the detector of end face and valve length detection amesdial to detect, reads valve length detection amesdial reading, i.e., Air valve total length numerical value to be detected can be conversed according to the length that air valve total length detects standard specimen.
In this way, have many advantages, such as it is easy to operate, it is easy to detect quick reliable accurate.
Specifically, air valve total length detection method is realized using valve device for detecting length below, such as in the present embodiment Shown in Fig. 1-2, the valve device for detecting length, including pedestal 1, wherein the vertical positioning fixture of engine valve stem is provided on pedestal 1 With air valve total length testing agency, the vertical positioning fixture of engine valve stem includes the engine valve stem positioning for being set on the base surface Seat 2,2 upper surface of engine valve stem positioning seat have an engine valve stem locating slot 3 opened up straight up, engine valve stem locating slot 3 for realizing engine valve stem upward positioning;Air valve total length testing agency includes being fixed at base upper surface vertically Guide rod 4, guide rod 4 are movably socketed with a sleeve 5 outside, and the direction that engine valve stem positioning seat is faced outside sleeve 5 is horizontal It is fixedly connected with an installation support arm 6 outward, is provided with a valve above 6 outer end face engine valve stem positioning seat of installation support arm Length detection amesdial 7, face engine valve stem locating slot is arranged the detector of valve length detection amesdial 7 straight down;Set It is additionally provided with height adjustment mechanism between cylinder 5 and guide rod 4, height adjustment mechanism can be realized the height of sleeve on the guide bar Position is adjusted.
In this way, first preparing an air valve total length detection standard specimen, the length that air valve total length detects standard specimen is that valve is total when detection Valve length when long detection margin of tolerance minimum value, it is then that the bar portion of air valve total length detection standard specimen is downwardly vertical fixed to gas In door rod portion locating slot, height adjustment mechanism is adjusted, so that the detector lower end of valve length detection amesdial and air valve total length Detection standard specimen upper end face contact simultaneously adjusts zero;Then air valve total length detection standard specimen is removed, valve length detection amesdial is kept Position is constant, and the bar portion of valve to be detected is downwardly vertical fixed in engine valve stem locating slot, keeps the upper end end face gentle End in contact detects under the detector of door length detection amesdial, reads valve length detection amesdial reading, can be according to valve The length of overall length detection standard specimen converses air valve total length numerical value to be detected.Therefore have structure simple, easy to operate, detection The advantages that reliable.
Wherein, it is vertically provided with amesdial mounting hole in the middle part of the installation support arm 6, amesdial mounting hole aperture and valve are long The detection bar fixed part outer diameter of detection micrometer 7 is spent unanimously and by the detection bar fixed part of valve length detection amesdial to press from both sides If being vertically provided with one in the middle part of the installation support arm in the inner, on the outside of amesdial mounting hole cracks 8, cracking 8 will be outside installation support arm Half section is divided into left half arm and right half arm, is vertically connected with fastening screw 9 in the horizontal direction between left half arm and right half arm Realize the fastening to the detection bar fixed part of valve length detection amesdial.
In this way, structure is simple and the installation of realization valve length detection amesdial is facilitated to fix.
Wherein, the height adjustment mechanism includes a height adjustment bolt 10, the nut of the height adjustment bolt 10 Part and sleeve, which are coaxially disposed and can install with horizontally rotating, is connected to 5 upper end of sleeve, coaxial in the middle part of the guide rod upper surface It is provided with height adjustment threaded hole straight down, the height adjustment bolt 10 is threadedly engaged in height adjustment threaded hole It is interior.
In this way, need to only rotate height adjustment bolt, its being threadedly engaged between height adjustment threaded hole can be passed through Height and position where changing height adjustment bolt, and then band moving sleeve realizes that upper-lower height is adjusted together.It is simple with structure, it adjusts Save the advantages that convenient and efficient reliable.
Wherein, the nut portion upper surface of the height adjustment bolt 10 vertically offers the adjustment hole of regular polygon.
It realizes in this way, facilitating and being inserted into the corresponding spanner that adjusts to the height adjustment of height adjustment bolt, keeps its structure simple The compact mounting height for not influencing to interfere amesdial, and it is easy to adjust.
Wherein, the rotation limit that limit is circumferentially rotated for sleeve is provided between 5 inner wall of sleeve and 4 outer wall of guide rod Bit architecture.
In such manner, it is possible to limit rotating in a circumferential direction for sleeve, avoid when sleeve height is adjusted because sleeve transfers to have an impact certainly.
Wherein, the rotary position limiting structure includes the vertical guiding raised line 11 that evagination is formed in guide rod outer wall, also Including being located at sleeve lining and vertical guide groove of the cooperation on vertically guiding raised line.
In this way, having structure simple, it is oriented to reliable advantage.
Wherein, height location structure is additionally provided on the sleeve 5, height location structure is for realizing sleeve height adjusting Being locked afterwards.
In this way, can be locked by height location structure realization after sleeve height adjusting.It avoids in detection process Sleeve height, which is touched, to change and influences detection accuracy.It can better ensure that detection is accurate reliable.
Wherein, the height location structure, including an altitude location bolt 12, altitude location bolt 12 it is horizontally disposed and Cooperate on sleeve 5 in a horizontal positioning bolt hole for running through setting, 12 inner end of altitude location bolt is connected to outside guide rod It realizes on wall and is locked to sleeve portion.
In this way, having many advantages, such as that structure is simple, it is locked easy to operate reliable.
Wherein, 1 upper surface of pedestal is additionally provided with the positioning seat sliding slot 13 an of strip, the engine valve stem positioning seat 2 Lower end is slidably fit into positioning seat sliding slot 13, and one end of positioning seat sliding slot 13 is the piece installing for being packed into valve to be detected End, the installation support arm are fallen in except piece installing end in the vertical projection of base upper surface, and the positioning seat sliding slot other end is face gas Test side below door length detection amesdial.
In this way, when making detection, when valve length detection amesdial adjusts height position by air valve total length detection standard specimen After setting and fixing and adjust zero, engine valve stem positioning seat first can be slided into piece installing end along the chute, in the realization pair of piece installing end Air valve total length detects the disassembly of standard specimen and the vertical installation of valve to be detected is fixed, and then moves engine valve stem positioning seat edge again Sliding slot, which slides into test side, detects end in contact under the detector of the gentle door length detection amesdial in end face thereon, and it is long to read valve Detection micrometer reading is spent, air valve total length numerical value to be detected can be conversed according to the length that air valve total length detects standard specimen.Therefore In such manner, it is possible to which more convenient realize the installation and detection for treating detection means, avoid component installation fixation procedure to testing result Influence, preferably raising detection accuracy and reliability.
Wherein, 13 length direction of positioning seat sliding slot is consistent with the installation length direction of support arm.In this way, its structure can be made more Step up to gather, reduce the area of pedestal, saves consumptive material.
Wherein, 2 lower end of engine valve stem positioning seat is cylinder, the piece installing end and test side of the positioning seat sliding slot 13 It is the 2 matched semicircle of lower end cylinder diameter of diameter and engine valve stem positioning seat.Positioning seat sliding slot more convenient in this way is sliding Fitting positioning after moving in place.
Wherein, detection reset spring 14 is provided in the positioning seat sliding slot along its length, detects reset spring 14 1 End and the test side of positioning seat sliding slot abut, and the other end is connected with engine valve stem positioning seat lower end and supports engine valve stem positioning seat It connects at the piece installing end of positioning seat sliding slot.
In this way, being at the uniform velocity moved to test side by manpower when detecting after engine valve stem positioning seat piece installing realizes detection, guarantee inspection Survey stability, need to only loose one's grip after detection, engine valve stem positioning seat can in the case where detecting action of reset spring quick sliding to piece installing end, Realize inloading part piece installing, it is very convenient quick, guarantee that detection is reliable and stable and improves dress and changes part efficiency.
Wherein, the detection reset spring 14 is helical spring, the test side end wall and engine valve stem positioning seat lower end Corresponding detection reset spring 14 is provided with spring mounting hole on side wall, and the both ends insertion of the detection reset spring is mounted on bullet In spring mounting hole.It can be convenient in this way and realize that the installation of helical spring is fixed, improve assembly efficiency and be conducive to dismounting and change.
Wherein, when 2 lower end of engine valve stem positioning seat is located at the test side of positioning seat sliding slot, the detection reset spring Two spring mounting holes can be compressed into connect in the space to be formed, so that engine valve stem positioning seat lower end side and positioning seat are sliding The test side inner wall of slot is affixed.In this way the accurate positionin to detection position preferably can be realized by test side inner wall, it is both real The installation settings of detection reset spring is showed to improve detection efficiency, and has avoided influence of the positioning accuracy by spring, ensure that It detects not only quick and convenient but also reliable and stable.
Wherein, there is 3 slot bottom of engine valve stem locating slot one to be used for and valve bottom end contacts the positioning for realizing positioning Face, 3 notch position of engine valve stem locating slot are provided with a circle for realizing the elastomeric element 15 clamped to engine valve stem.
In this way, valve position when, engine valve stem lower end squeeze elastomeric element, and be inserted into engine valve stem locating slot slot bottom and Face contact is positioned, is clamped in this way by elastomeric element, can better ensure that and the precision of valve positioning in the height direction is wanted It asks, valve end outer dimension error is avoided to impact the precision in positioning height direction, ensure that the accuracy of detection.
Wherein, the elastomeric element 15 be fixed at engine valve stem locating slot notch one circle rubber material obtain. In this way, structure is simple, it is conducive to setting, low in cost and resilient clamp is reliable and stable.
It, will be to be detected using engine valve stem Linearity surveying method below when realizing engine valve stem Linearity surveying Engine valve stem is positioned on two positioning surfaces of two sections of location structures, then push down engine valve stem make its respectively with two positioning surfaces The line contact along two parallel lines is formed, the detection notch for detection is reserved between two sections of location structures, using thousand points of number Table makes its test side contact and generate certain precompressed amount from detection gap position and engine valve stem peripheral surface, then fixes Digital dial gauge;While keeping the contact of the line of engine valve stem and two positioning surfaces at this time, pulled along engine valve stem length direction Then engine valve stem observes the variable quantity of digital dial gauge, i.e. detection obtains the straightness data of engine valve stem.
In this way, being when to the detection of engine valve stem straightness, at left and right sides of engine valve stem test point position and positioning knot It is configured to the positioning of each two lines contact, this avoid surface of position out-of-flatnesses at valve stem positioning to cause to Linearity surveying Influence, improve detection accuracy and reliability.
In the present embodiment, above-mentioned engine valve stem Linearity surveying method specifically uses Fig. 3-engine valve stem shown in Fig. 4 straight Dimension detection device realizes that the device includes bottom block 31, and valve positioning fixture is provided on bottom block 31 and engine valve stem is straight Dimension testing agency, the valve positioning fixture include the location structure of two sections of one length directions of following wind setting, every section of positioning knot Structure includes the positioning surface that two intersections are in angle, and two positioning surfaces of two location structures respectively can be used in being formed with valve stem Line on same straight line contacts, and the position between two sections of location structures is formed with a detection notch 32;The engine valve stem is straight Dimension testing agency includes an engine valve stem Linearity surveying digital dial gauge 33, and digital dial gauge 33 has a cooperation Section, cooperation section cooperation are described be combined into can in the matching hole on an amesdial matching seat 34 for being set to bottom block 31 Along being slidably matched for digital dial gauge detection bar length direction sliding, it is additionally provided on amesdial matching seat 34 straight to engine valve stem The amesdial fixed structure that dimension detection is fixed with digital dial gauge, digital dial gauge detection bar is perpendicular to the gas after positioning Door rod direction of axis line and face detection 32 position of notch setting, and digital dial gauge detection bar front end is formed with a detection End, detection is realized in the contact of valve stem peripheral surface after which is used for and positions.
In this way, engine valve stem to be detected can be positioned to two sections of location structures when engine valve stem Linearity surveying On two positioning surfaces, then pushing down engine valve stem makes it form line contact with two positioning surfaces respectively, then adjusts digital dial gauge Position makes its test side contact from detection gap position and engine valve stem peripheral surface and generate certain precompressed amount, then according to Digital dial gauge is fixed by amesdial fixed structure.While keeping the contact of the line of engine valve stem and two positioning surfaces at this time, Engine valve stem is pulled along engine valve stem length direction, the variable quantity of digital dial gauge is then observed, can be detected to obtain valve stem The straightness data in portion.Further, matching hole can be horizontally disposed with, with more convenient adjusting detection.
Wherein, valve positioning fixture includes the first locating piece 35 and the second locating piece 36 of whole rectangular-blocklike structure, First locating piece and the fitting of the second locating piece horizontal direction, which are arranged and are fixed on bottom block, makes 35 upper surface of the first locating piece Described two positioning surfaces are formed with the fitting side side of the second locating piece 36, the detection notch 32 is by the first locating piece 35 and The groove of two locating pieces, 36 upper surface obtains.
Make its structure simple in this way, the processing and installation of conveniently positioning structure is formed, and makes to be formed level side To two positioning surfaces of a vertical direction, two positioning surfaces are mutually perpendicular to, and keep its positioning reliable, mutual alignment relation precision can It leans on.
Wherein, valve positioning fixture further includes a third locating piece 37, and the third locating piece 37 is fixed by screw On bottom block 31,37 upper surface of third locating piece is provided with the locating slot that an entirety is in cuboid structure, locating slot ground For horizontally disposed locating piece datum level, groove width and the first locating piece 35 and the second locating piece 36 are positioned along perpendicular to its fitting The sum of width of side side surface direction is consistent, so that the first locating piece 35 and the second locating piece 36 are located in locating slot, first is fixed Position block 35 and 36 bottom surface of the second locating piece and the fitting of locating piece datum level, locating slot are located at the top of one side position of digital dial gauge Surface is lower than the first locating piece upper surface location.
In this way, need to only be fixed by the installation that screw completes third locating piece when assembly, then by the first locating piece and the Clamping is packed into locating slot after the fitting of two locating pieces, installs very convenient quick, and the first locating piece and the second locating piece Rigging error can determine by the cooperation between third locating piece, can more convenient reduction mismatch error, greatly improve Detection accuracy.
It wherein, further include engine valve stem pressing device, engine valve stem pressing device includes an elastic component 38 and setting An applicator member 39 on elastic component 38, applicator member 39 are located on the direction of two positioning surface angle faces and in bullet Property engine valve stem peripheral surface after the effect of component elastic force is lower and positioning contact and compress.
Facilitate in this way and replaces manpower to apply a pressure pair from the direction of two positioning surface angles of face by pressing device Engine valve stem after positioning, which is realized, to be compressed, and when itself and two positioning surfaces being made to form line contact, in this way detection operation, manually only needs to control System pulls engine valve stem to be axially moveable.Operator can be preferably liberated, better ensures that detection accuracy.
Wherein, elastic component 38 is the elastic press of angularly disposed strip, and elastic press lower end is fixed on a peace In a briquetting mounting base loaded on bottom block, the applicator member 39 is installed in elastic press upper end.
In this way, structure is simple and quick and easy for installation, it is easy to implement.
Wherein, curved arc, elastic press upper center extend to form forward along the length direction under being in the middle part of elastic press There is installation shaft, the applicator member 39 is the roller body being rotatably engaged in installation shaft, and roller body peripheral surface is used Compression is realized in forming point contact with engine valve stem peripheral surface after positioning.
In this way, forming rolling friction using roller body as applicator member to improve the smoothness of detection, while roller body Compared to roll structure, while itself more convenient assembly, additionally it is possible to preferably facilitate realization circumferential to engine valve stem after positioning The point contact on surface compresses, and after forming point contact compression, can preferably reduce influence of the compaction process itself to detection accuracy.
Wherein, engine valve stem pressing device is along engine valve stem length direction spacing parallel arranging is arranged after positioning two, together When digital dial gauge test side face be located between the applicator member 39 of two engine valve stem pressing devices.It is located in this way, being formed Two compression points of digital dial gauge two sides, also can be better maintained balance and valve while capable of preferably keeping compression Bar moves flexibility, preferably avoids engine valve stem from beating by pressing device, improves detection accuracy.
Wherein, the cooperation section is formed on the detection rod rear end fixed part of digital dial gauge 33, and the amesdial is solid Determining structure includes the amesdial fixing screws 40 being arranged on amesdial matching seat 34 that are screwed on, the amesdial fixing screws Matching hole setting and front end on 40 face amesdial matching seats, which are used to contact with the detection bar peripheral surface in matching hole, to be realized It is fixed.
In this way, having structure simple, facilitate implementation, and digital dial gauge be slidably matched and fix it is convenient and reliable etc. excellent Point.
Wherein, it is fixedly installed a lengthening block on the active segment of digital dial gauge detection bar front forward in the axial direction 41, lengthening block front end is provided with a detection ball 42 and forms the test side.
In this way, can preferably extend the length of detection bar, it is made smoothly to realize detection, while can be convenient for difference The correspondence size of the engine valve stem adjustment detection ball of model, makes it more smoothly realize detection, improves detection reliability.
Wherein, it lengthens and is provided with vertical crack 43 in the middle part of 41 front half section of block along its length, crack makes before lengthening block It is integrally formed in the front end surface of half section of left front half section of formation and right front half section, the left front half section and right front half section and is used for and examines Survey the detection ball mounting groove that installation is realized in the fitting of 42 surface of ball.
In this way, because detection ball mounting groove notch, which is generally, is equal to or slightly less than the spherical with energy of detection ball diameter Enough clamp detection ball, therefore crack will lengthen after block front half section is separated to form left front half section and right front half section, it can be by a left side The elasticity of front half section and right front half section itself facilitates the insertion installation of detection ball.
Wherein, also there is one at 43 inner end of crack and expand rounded extended region space 44 to two sides.
In this way, the position of left front half section and right front half section generation flexible deformation is in rear end when making installation detection ball Extended area spatial position, front end restores and remains that detection circle can be clamped after capable of better ensuring that detection ball installation The state of ball avoids left front half section and right front half section front end from generating influence of the flexible deformation to detection accuracy, improves detection accuracy.
Wherein, lengthening has a detection bar pilot hole being arranged along its length in the middle part of 41 rear end face of block, detection bar dress Distribution front end and the extended area space 44 of crack communicate, and digital dial gauge detection bar front end movable part is fixedly mounted on detection In bar pilot hole, and detection bar front end end is exposed to the extended area space 44 of crack.In this way, can be convenient detection bar assembly Assembly and alignment between hole and lengthening block, to improve detection accuracy.
Wherein, lengthening 41 rear end upper surface of block, which is screwed on, is provided with detection bar fixing bolt 45, before detection bar fixing bolt 45 End is fixed for realizing with the contact of digital dial gauge detection bar front end movable part.In this way, structure is simple, and detection bar is fixed It is convenient and reliable.
Wherein, left front half section and right front half section, which extend transversely through to be screwed on to be provided with before, lengthens block fixing bolt 46.In this way, After the loading for completing detection ball, it can realize to left front half section and right front half section front end by block fixing bolt is lengthened along left and right The limitation of propagation direction flexible deformation thoroughly prevents it from generating influence of the flexible deformation to detection accuracy.

Claims (8)

1. a kind of air valve total length detection method, which is characterized in that first prepare an air valve total length detection standard specimen, air valve total length detection The length of standard specimen is valve length when air valve total length detects margin of tolerance minimum value, then by the bar of air valve total length detection standard specimen Portion is downwardly vertical to be fixed on an engine valve stem positioning seat, using a valve length detection amesdial, is made under its detector End detects standard specimen upper end face contact with air valve total length straight down and adjusts zero, fixes valve length detection amesdial place Height and position;Then air valve total length detection standard specimen is removed, keeps valve length detection amesdial position constant, by gas to be detected The bar portion of door is downwardly vertical to be fixed in engine valve stem locating slot, and the detection of the upper end end face and valve length detection amesdial is made The lower end in contact detection of head, reads valve length detection amesdial reading, and the length that standard specimen can be detected according to air valve total length converts Air valve total length numerical value to be detected out;
It is realized using valve device for detecting length below, the valve device for detecting length, the pedestal including cuboid structure, The vertical positioning fixture of engine valve stem and air valve total length testing agency are provided on pedestal, the vertical positioning fixture of engine valve stem includes one A engine valve stem positioning seat for being set on the base surface, what engine valve stem positioning seat upper surface opened up straight up with one Engine valve stem locating slot, engine valve stem locating slot for realizing engine valve stem upward positioning;Air valve total length testing agency packet The guide rod for being fixed at base upper surface vertically is included, a sleeve is movably socketed with outside guide rod, is faced outside sleeve The direction of engine valve stem positioning seat is fixedly connected with an installation support arm horizontally outward, and installation support arm outer end face engine valve stem is fixed A valve length detection amesdial is provided with above the seat of position, the detector of valve length detection amesdial face gas straight down The setting of door rod portion locating slot;Height adjustment mechanism is additionally provided between sleeve and guide rod, height adjustment mechanism can be realized set The height and position of cylinder on the guide bar is adjusted;
Base upper surface is additionally provided with the positioning seat sliding slot an of strip, and engine valve stem positioning seat lower end is slideably matched It closes in positioning seat sliding slot, one end of positioning seat sliding slot is the piece installing end for being packed into valve to be detected, and the installation support arm exists The vertical projection of base upper surface is fallen in except piece installing end, and the positioning seat sliding slot other end is under face valve length detection amesdial The test side of side.
2. air valve total length detection method as described in claim 1, which is characterized in that the height adjustment mechanism includes a height Degree adjusts bolt, and the nut portion and sleeve of the height adjustment bolt, which are coaxially disposed and can install with horizontally rotating, is connected to set Cylinder upper end, the guide rod upper surface middle part are coaxially arranged with height adjustment threaded hole straight down, the height adjustment Bolt thread cooperates in height adjustment threaded hole.
3. air valve total length detection method as claimed in claim 2, which is characterized in that the sleeve lining and guide rod outer wall it Between be provided with the rotary position limiting structure that limit is circumferentially rotated for sleeve.
4. air valve total length detection method as claimed in claim 2, which is characterized in that be additionally provided with altitude location on the sleeve Structure, height location structure is for realizing being locked after sleeve height adjusting.
5. air valve total length detection method as described in claim 1, which is characterized in that in the positioning seat sliding slot along its length It is provided with detection reset spring, the test side for detecting reset spring one end and positioning seat sliding slot abuts, the other end and engine valve stem Positioning seat lower end is connected and engine valve stem positioning seat is connected to the piece installing end of positioning seat sliding slot.
6. a kind of valve characterization processes include the steps that realizing air valve total length detection and realize the step of engine valve stem Linearity surveying Suddenly, it when realizing air valve total length detection, is realized using air valve total length detection method according to any one of claims 1 to 5;It is real When existing engine valve stem Linearity surveying, engine valve stem to be detected is positioned on two positioning surfaces of two sections of location structures, so Pushing down engine valve stem afterwards makes it form the line contact along two parallel lines with two positioning surfaces respectively, stays between two sections of location structures Detection notch for detection out makes its test side from detection gap position and engine valve stem peripheral surface using digital dial gauge Certain precompressed amount is contacted and generated, digital dial gauge is then fixed;The line of engine valve stem and two positioning surfaces is kept at this time While contact, engine valve stem is pulled along engine valve stem length direction, the variable quantity of digital dial gauge is then observed, that is, detects To the straightness data of engine valve stem.
7. valve characterization processes as claimed in claim 6, which is characterized in that filled using engine valve stem Linearity surveying below It sets and realizes engine valve stem Linearity surveying, the engine valve stem linearity testing apparatus includes bottom block, is provided on bottom block Valve positioning fixture and engine valve stem straightness detection mechanism, the valve positioning fixture include that two sections of one length directions of following wind are set The location structure set, every section of location structure include the positioning surface that two intersections are in angle, two positioning surfaces of two location structures It respectively can be used in the line formed on same straight line with valve stem contact, the position between two sections of location structures is formed with an inspection Survey notch;The engine valve stem straightness detection mechanism includes an engine valve stem Linearity surveying digital dial gauge, number Amesdial has a cooperation section, and cooperation section cooperates in the matching hole on an amesdial matching seat for being set to bottom block, It is described be combined into be capable of along digital dial gauge detection bar length direction sliding being slidably matched, be additionally provided on amesdial matching seat To the amesdial fixed structure that engine valve stem Linearity surveying is fixed with digital dial gauge, digital dial gauge detection bar is vertical Valve stem direction of axis line and face detection gap position setting after positioning, and digital dial gauge detection bar front end is formed with One test side, detection is realized in the contact of valve stem peripheral surface after which is used for and positions.
8. valve characterization processes as claimed in claim 7, which is characterized in that valve positioning fixture includes whole rectangular-blocklike The first locating piece and the second locating piece of structure, the first locating piece and the fitting of the second locating piece horizontal direction are arranged and are fixed to bottom The fitting side side of the first locating piece upper surface and the second locating piece is made to form described two positioning surfaces, the detection on panel seat Notch is obtained by the groove of the first locating piece and the second locating piece upper surface.
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