CN107238336A - Engine valve stem detection device - Google Patents

Abstract

The invention discloses a valve stem detection device, which comprises a valve stem straightness detection device and a valve stem end surface beating detection device, and the valve stem straightness detection device includes a base plate seat on which a valve stem positioning fixture is arranged And the straightness detection mechanism of the valve stem, the valve stem positioning fixture includes two positioning structures arranged along the same length direction, each positioning structure includes two intersecting positioning surfaces forming an included angle and can be used to form a valve stem Line contact on the same straight line; the straightness detection mechanism of the valve stem portion includes a digital dial gauge for detection of the straightness of the valve stem portion, and a detection end is formed at the front end of the detection rod of the digital dial gauge, and the detection end is used for and After positioning, the peripheral surface of the valve stem contacts to realize the detection. The invention has the characteristics of simple structure, convenient and quick operation, and can realize the detection of the straightness of the valve rod part, and the detection result is accurate and reliable.

Description

Valve Stem Inspection Equipment

technical field

The invention relates to the technical field of production detection of automobile engine parts, in particular to a valve stem detection device.

Background technique

The automobile engine can convert the chemical energy of fuel or other forms of energy into mechanical energy to provide power for the automobile. It is the heart of the automobile and belongs to a technology-intensive product. With the development of our country's economy, while the demand for automobiles is increasing day by day, the automobile industry has developed rapidly, and people's requirements for the performance of automobile engines are also getting higher and higher.

In an automobile engine, the intake and exhaust valve is a component composed of a disc part and a rod part coaxial with the disc part. It is one of the key parts of the car engine and is the door of the engine combustion chamber. The key basic parts that seal the intake and exhaust ports during the working process are used to block the airflow passage and control the gas exchange of the engine. In every working process of the engine, the intake valve and the exhaust valve are opened and closed once. When the valve is opened and closed, the valve bears the pressure of the valve spring and the pressure when it is seated. Especially in the compression and power strokes, the intake valve and exhaust valve play a role in sealing the combustion chamber. Therefore, the quality of the valve has an important impact on the performance and life of the engine.

The processing accuracy and structure of the valve play a decisive role in the movement of the engine valve train. At the same time, the stem of the valve is the key part of the valve. It is not only the design reference, but also the process and detection reference. It is closely related to almost all parts of the valve. relationship, the traditional valve stem detection method needs to rely on a lot of labor to complete, the detection cost is high and the efficiency is low, and the relevant inspection tools for quality and accuracy detection are easily affected by the factors of the operator, and it is easy to cause detection due to human visual fatigue. The instability of the product increases the error rate of the product. Difficult to meet the ever-increasing product quality requirements.

The valve stem refers to the part that works in the valve guide, and the straightness of the stem directly affects the normal operation of the valve. In the factory production process, the straightness of the valve stem is guaranteed by the process of straightening it. Among the existing valve manufacturers, some valve manufacturers mainly rely on a universal tool microscope to detect the straightness of the valve stem. Because of the high cost of inspection and the long time required, the straightness and frequency of inspection of the valve stem and the number of batches are very limited, and it is directly considered that there is a straightening process to guarantee it. Companies that do not have a universal tool microscope generally do not test this item. At the same time, whether the end face of the valve stem is flat is also one of the important factors affecting the assembly accuracy of the valve. Existing manufacturers mainly use an end face runout instrument to detect the runout of the end face of the rod, which has defects such as large equipment, high cost, and large occupied space. , which seriously increased the production cost of the enterprise.

Therefore, how to design a valve stem detection device with simple structure, convenient operation, and reliable detection to realize the detection of valve stem data has become a problem to be considered and solved.

Contents of the invention

The technical problem to be solved by the present invention is: how to provide a valve stem detection device with simple structure, convenient and quick operation, which can realize the detection of the straightness of the valve stem, the detection of the flatness of the end surface of the valve stem, and the detection result is accurate and reliable. equipment.

In order to solve the above technical problems, the present invention adopts the following technical solutions.

A valve stem detection device, including a valve stem straightness detection device, the valve stem straightness detection device includes a base plate seat, which is characterized in that a valve stem positioning fixture and a valve stem straightness detection mechanism are arranged on the base plate , the valve stem positioning fixture includes two sections of positioning structures arranged along the same length direction, each section of positioning structure includes two intersecting positioning surfaces forming an included angle, and the two positioning surfaces of the two positioning structures can be respectively used for connecting with the valve The rod forms a line contact on the same straight line, and a detection gap is formed at the position between the two positioning structures; the straightness detection mechanism of the valve stem part includes a digital dial gauge for detection of the straightness of the valve stem part, and the digital dial gauge It has a matching section arranged horizontally, and the matching section is fitted into a fitting hole on a dial gauge mating seat arranged on the bottom plate base. The gauge mating seat is also provided with a dial indicator fixing structure for fixing the straightness of the valve stem with a digital dial gauge. The digital dial gauge detection rod is perpendicular to the direction of the valve stem axis after positioning and is facing the detection gap. The position is set, and a detection end is formed at the front end of the detection rod of the digital dial indicator, and the detection end is used to contact with the circumferential surface of the valve rod after positioning to realize detection.

In this way, during detection, the valve stem to be detected can be positioned on the two positioning surfaces of the two-stage positioning structure, and then the valve stem is pressed to form line contact with the two positioning surfaces respectively, and then the digital dial gauge is adjusted position, so that the detection end is in contact with the circumferential surface of the valve stem from the position of the detection notch and a certain amount of preload is generated, and then the digital dial gauge is fixed by the dial gauge fixing structure. At this time, while keeping the line contact between the valve stem and the two positioning surfaces, pull the valve stem along the length direction of the valve stem, and then observe the change of the digital dial gauge to obtain the straightness data of the valve stem; In this way, during detection, the left and right sides of the detection point of the valve stem are positioned to form two lines of contact with the positioning structure, which avoids the influence of the unevenness of the surface of the position of the valve stem on the straightness detection, and improves the detection accuracy. precision and reliability. Therefore, it has the characteristics of simple structure, convenient operation and high detection accuracy. Among them, the matching hole level is set to make it easier to adjust and detect.

As an optimization, the valve stem locating fixture includes a first locating block and a second locating block with a rectangular block structure as a whole. The first locating block and the second locating block are installed in a horizontal direction and fixed on the base plate so that the first positioning The upper surface of the block and the bonding side of the second positioning block form the two positioning surfaces, and the detection gap is obtained by the grooves on the upper surfaces of the first positioning block and the second positioning block.

This makes the structure simple, facilitates the processing and installation of the positioning structure, and makes two positioning surfaces formed in a horizontal direction and a vertical direction, and the two positioning surfaces are perpendicular to each other, so that the positioning is reliable and the accuracy of the mutual positional relationship is reliable.

As an optimization, the valve stem positioning fixture also includes a third positioning block, and the third positioning block is fixed on the base plate seat by screws, and a positioning groove with a rectangular structure as a whole is arranged on the upper surface of the third positioning block, and the positioning groove The ground is the reference plane of the positioning block set horizontally, and the width of the positioning groove is consistent with the sum of the widths of the first positioning block and the second positioning block along the direction perpendicular to the side of the joint side, so that the first positioning block and the second positioning block are sandwiched In the positioning groove, the bottom surfaces of the first positioning block and the second positioning block are attached to the reference surface of the positioning block, and the upper surface of the positioning groove on one side of the digital dial gauge is lower than the upper surface of the first positioning block.

In this way, when assembling, you only need to rely on the screws to complete the installation and fixation of the third positioning block, and then fit the first positioning block and the second positioning block into the positioning slot after being stuck together. The installation is very convenient and fast, and the first positioning block The assembly error between the block and the second positioning block can be determined by the cooperation between the third positioning block, which can more conveniently reduce the matching error and greatly improve the detection accuracy.

As an optimization, it also includes a valve stem pressing device, the valve stem pressing device includes an elastic member and a pressing member arranged on the elastic member, the pressing member is located in the direction facing the angle between the two positioning surfaces and Under the action of the elastic force of the elastic member, it contacts and presses the circumferential surface of the positioned valve stem part.

In this way, it is convenient to rely on the pressing device instead of human hands to apply a pressure to the positioned valve stem from the direction facing the angle between the two positioning surfaces, so that it forms a line contact with the two positioning surfaces. Just control and pull the valve stem to move axially. It can better liberate the operator and better ensure the detection accuracy.

As an optimization, the elastic member is an elongated elastic pressing block arranged obliquely, the lower end of the elastic pressing block is fixed on a pressing block mounting seat installed on the floor seat, and the pressing member is installed on the upper end of the elastic pressing block.

In this way, the structure is simple, the installation is convenient and quick, and the implementation is easy.

As an optimization, the middle part of the elastic pressure block is curved downward, and the middle part of the upper end of the elastic pressure block extends forward along the length direction to form a mounting shaft. The pressing member is a roller body rotatably fitted on the mounting shaft. The peripheral surface of the cylinder is used to form a point contact with the peripheral surface of the post-positioned valve stem to achieve compression.

In this way, the roller body is used as the pressure member to form rolling friction to improve the smoothness of detection. At the same time, compared with the ball structure, the roller body is more convenient for its own assembly, and it can also better facilitate the positioning of the rear valve stem. The point contact compaction on the circumferential surface can better reduce the influence of the compaction process itself on the detection accuracy after the point contact compaction is formed.

Further, the valve stem pressing device is two arranged side by side at intervals along the length direction of the valve stem after positioning, and the detection end of the digital dial indicator is located directly between the pressing members of the two valve stem pressing devices. In this way, two compression points located on both sides of the digital dial indicator are formed, which can better maintain the compression while maintaining the balance and the flexibility of the valve stem movement, and better rely on the compression device to avoid the valve stem Head beat, improve detection accuracy.

As an optimization, the matching section is formed on the fixed part of the rear end of the detection rod of the digital dial gauge, and the dial gauge fixing structure includes a dial gauge fixing screw screwed on the dial gauge matching seat, the said The dial indicator fixing screw is set against the matching hole on the dial indicator matching seat and the front end is used to contact with the circumferential surface of the detection rod in the matching hole to realize fixing.

In this way, the utility model has the advantages of simple structure, convenient implementation, convenient and reliable sliding fit and fixing of the digital dial gauge.

As an optimization, an extension block is fixed forward along the axial direction on the movable section of the front part of the detection rod of the digital dial indicator, and a detection ball is arranged at the front end of the extension block to form the detection end.

In this way, the length of the detection rod can be better extended, so that it can be detected smoothly, and at the same time, the corresponding size of the detection ball can be conveniently adjusted for different types of valve rods, so that the detection can be realized more smoothly, and the detection reliability can be improved.

As an optimization, the middle part of the first half of the extension block is provided with a vertical gap along the length direction, and the gap makes the front half of the extension block form a left front half and a right front half. The detection ball installation groove is attached to the surface of the detection ball to realize the installation.

In this way, because the notch of the detection ball installation groove is generally equal to or slightly smaller than the spherical crown shape of the detection ball diameter to be able to clamp the detection ball, the gap separates the front half of the extension block to form the left front half and the right front half. , can rely on the elasticity of the left front half and the right front half to facilitate the detection of the embedded installation of the ball.

As an optimization, the inner end of the slit also has a circular expansion area space that expands to both sides.

In this way, when the detection ball is installed, the elastically deformed position of the left front half and the right front half is located in the spatial position of the rear end expansion area, which can better ensure that the front end of the detection ball is restored and maintained to be able to clamp the detection circle. The state of the ball avoids the impact of elastic deformation on the detection accuracy of the front end of the left front half and the right front half, and improves the detection accuracy.

Further, the middle part of the rear end face of the extension block has a detection rod assembly hole arranged along the length direction, the front end of the detection rod assembly hole is connected to the expansion area of the gap, and the front end movable part of the digital dial gauge detection rod is fixedly installed in the detection rod assembly hole Inside, and the front end of the detection rod is exposed in the expanded area space of the gap. In this way, the assembly and alignment between the assembly hole of the detection rod and the extension block can be facilitated, so as to improve detection accuracy.

Further, the upper surface of the rear end of the extension block is screwed with a detection rod fixing bolt, and the front end of the detection rod fixing bolt is used to contact with the movable part of the front end of the detection rod of the digital dial gauge to achieve fixation. In this way, the structure is simple, and the fixing of the detection rod is convenient and reliable.

Further, the front left half section and the right front half section are horizontally penetrated and screwed with elongated block fixing bolts. In this way, after the detection ball is installed, the elastic deformation of the front ends of the left front half and the right front half along the left and right expansion directions can be restricted by the extension block fixing bolts, completely preventing the elastic deformation from affecting the detection accuracy.

Further, the valve stem detection device of the present invention also includes a valve stem end surface beating detection device, the valve stem end surface beating detection device includes a base, a valve positioning fixture and a valve stem end surface beating detection mechanism are arranged on the base, the valve The positioning fixture is used to realize the support and positioning of the valve stem in the horizontal direction, and the valve stem end face runout detection mechanism includes a lever dial indicator, and the measuring head of the lever dial gauge is used to contact the end surface of the positioned valve stem to realize detection; The valve positioning fixture includes a rod peripheral surface support seat arranged on the base along the same horizontal line, and a rod peripheral surface for upwardly supporting and positioning the rod peripheral surface is provided on the rod peripheral surface support seat. The support member, the circumferential surface of the rod part, the support member is used for contacting with both sides of the lower part of the circumferential surface of the rod part to realize support positioning.

In this way, after realizing the detection of the straightness of the valve stem part, the detection of the runout tolerance of the end surface of the valve stem part can also be realized by further relying on the valve stem end surface runout detection device. During detection, the valve relies on the rod to achieve support and positioning on the valve positioning fixture, and then after the probe at the lower end of the lever dial gauge contacts the end face of the positioned valve rod, adjust the position of the valve rod so that the probe at the lower end of the lever dial gauge A certain preload is formed, and the lever dial indicator displays the initial reading, and then the valve rod end surface beating tolerance can be read from the lever dial indicator by slowly rotating the valve vertically with the valve disc in hand. The valve locating fixture adopted has a simple structure, convenient and fast locating, and is beneficial to the realization of detection.

As an optimization, the supporting member on the peripheral surface of the rod portion includes two pairs of supporting spheres that are equal and horizontally arranged in pairs. The upper half of the opposite side of the sphere is used for contacting with the circumferential surface of the rod to realize support positioning.

In this way, two pairs of supporting spheres arranged in pairs are used to realize the contact support on the circumferential surface of the rod, so that the rod and the supporting member are in point contact, which can prevent the axis line from being distorted due to the irregularity of the rod itself to the greatest extent. On a straight line, the detection error is further increased, and the detection accuracy is improved. Using two pairs of support spheres can ensure support stability. Of course, V-shaped positioning blocks can also be used to realize the support and positioning of the rod during implementation, but this structure is that the two positioning surfaces are in contact with the rod. If the rod itself is irregular, or the positioning surface itself is not flat enough, it will cause the rod to When the head rotates, the axis line is not in a straight line, which will lead to an increase in the detection error.

Further, the two pairs of supporting spheres are respectively arranged on an independent supporting seat on the peripheral surface of the bar, and the lever dial gauge is arranged on a linear position between the two pairs of supporting spheres. In this way, compared with the use of one supporting seat, the material is saved, the supporting force is convenient, and at the same time, it is beneficial to adjust the position between the two pairs of supporting spheres to facilitate detection.

Further, the middle part of the upper end of the support seat on the circumferential surface of the rod is provided with a support sphere installation groove with a rectangular horizontal section, and the support spheres are installed in pairs in the support sphere installation groove. The four sides of the support sphere and the mounting groove are adjacent to each other. In this way, only two equivalent support spheres need to be put into the support sphere installation groove, and they can be automatically positioned in a horizontally adhering state without adjustment, and the installation and use are very fast and convenient.

As an optimization, a rod pressing mechanism is also provided on any supporting seat on the peripheral surface of the rod. A pressing piece is arranged above the connecting line between the two pairs of supporting spheres, and the pressing piece is used to contact and press the upper surface of the positioned rod.

In this way, a simple structure is used to apply a pressure to the upper surface of the rod, which can prevent the rod from bouncing and moving due to excessive force or unbalanced force applied when the valve is rotated manually during the detection process, and better ensure reliable detection accuracy.

Further, the pressing member is a roller sleeve rotatably installed on the elastic piece, and the axial direction of the roller sleeve is consistent with the axial direction of the rod after installation and positioning. In this way, the contact area between the pressing part and the rod part is reduced, and the rolling friction between the two during detection can better reduce the influence of the pressing part on the detection.

Further, the valve rod end face beating detection mechanism also includes a rod end face positioning seat, and the rod end face positioning seat is provided with a rod end face limiting member for abutting against the rod end face to limit the position; the rod end face limiting member is A horizontally arranged ejector rod, one end of the ejector rod has a conical apex and the apex is used to contact and limit the position of the center of the end face of the rod after positioning; the lever dial indicator is installed and fixed on the ejector rod, and The measuring head of the lever dial gauge is located at the front side adjacent to the range where the center of the ejector rod takes the radius of the end face circle of the rod as the radius.

In this way, relying on the contact limit between the top and the center of the end face of the rod, the axial limit of the valve stem can be guaranteed, and the axial displacement caused by the unbalanced force applied when rotating the valve stem can be avoided, which will affect the detection results. And more importantly, the limit structure can better ensure that the position of the axis line remains unchanged during the rotation of the rod, so it will not affect the detection of the beating of the end face of the rod by the lever dial gauge, so it can better ensure the detection precision.

A lever dial indicator mounting seat is arranged on the ejector rod, and a ejector rod assembly hole is horizontally arranged on the lever dial indicator installation seat, and a ejector rod clamping seam is arranged vertically downward under the ejector rod assembly hole, and the ejector rod The lever dial indicator mounting seat on the side of the clamping seam is provided with mounting seat fixing bolts, and the mounting seat fixing bolts can slide horizontally through the lever dial indicator mounting seat on the side of the clamping seam of the ejector rod and threadedly connected to the ejector rod In the threaded hole on the inner wall on the other side of the clamping seam, the mounting seat of the lever dial indicator is slidably fitted on the ejector rod by means of the mounting hole of the ejector rod and can be fixed by means of the fixing bolt of the rotating mounting seat; the lever dial indicator is fixed Mounted on the upper surface of the lever indicator.

In this way, the axial position of the lever dial indicator on the ejector rod can be adjusted more conveniently, so that the measuring head of the lever dial indicator can be accurately located in front of the range where the top of the ejector rod takes the radius of the end face circle of the rod as the radius. Adjacent to the side for smooth detection.

Further, a push rod installation column is vertically arranged on the positioning seat of the end face of the rod portion, and the push rod horizontally penetrates a push rod installation hole on the upper part of the push rod installation column, and a push rod is also screwed on the upper part of the push rod installation column to fix it. The front end of the bolt and the ejector rod fixing bolt abuts with the ejector rod in the ejector rod mounting hole to realize the fixing of the ejector rod. In this way, the front and rear positions of the push rod can be conveniently installed and adjusted.

Further, the lower end of the ejector rod mounting column is plugged and installed in a vertical ejector rod mounting column socket on the end face positioning seat of the rod part, and the end face positioning seat of the rod part is also directly connected to the ejector rod mounting column socket and horizontally penetrated. There are positioning bolts for the ejector rod installation column, and the front end of the ejector rod installation column positioning bolt is abutted and fixed with the ejector rod installation column. In this way, it is convenient to adjust the upper and lower positions of the ejector rod installation column, and then adjust the height of the ejector rod. It is only necessary to ensure that the axis line of the ejector rod and the middle of the two pairs of supporting spheres are in the same vertical plane during design and production, and the installation is more convenient and quick. Correctly adjust the top of the ejector rod to contact and locate the center of the end face of the rod after positioning.

As an optimization, the upper surface of the base is provided with a dovetail groove along the valve positioning direction, and the lower ends of the support seat on the circumferential surface of the rod and the positioning seat on the end face of the rod are respectively provided downward with a block matching the dovetail groove to slidably fit in the dovetail groove Inside, the supporting seat on the circumferential surface of the rod portion and the positioning seat on the end face of the rod portion are also vertically penetrated and screwed to be provided with fixing bolts of the supporting seat to realize locking and fixing.

In this way, it is convenient to adjust the mutual distance between the supporting seats on the circumferential surface of the two rod parts and the positioning seat on the end face of the rod part, so as to facilitate detection.

To sum up, the present invention has the characteristics of simple structure, convenient and quick operation, and can realize the detection of the straightness of the valve stem, and can further realize the detection of the runout tolerance of the end surface of the valve stem, and the detection result is accurate and reliable.

Description of drawings

FIG. 1 is a schematic structural diagram of a valve stem straightness detection device in a top view direction in an embodiment of the present invention.

FIG. 2 is a schematic perspective view of the three-dimensional structure of FIG. 1 .

Fig. 3 is a schematic diagram of the structure of the valve rod end face bounce detection device in the top view direction in the embodiment of the present invention.

FIG. 4 is a schematic perspective view of the three-dimensional structure of FIG. 3 .

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Example:

A valve stem detection device, including a valve stem straightness detection device, as shown in Figure 1-2, the valve stem straightness detection device includes a base plate seat 31, which is characterized in that the valve stem portion is arranged on the base plate base 31 The positioning fixture and the valve stem straightness detection mechanism, the valve stem positioning fixture includes two positioning structures arranged along the same length direction, each positioning structure includes two intersecting positioning surfaces that form an included angle, and the positioning structures of the two positioning structures The two positioning surfaces can be used to form a line contact on the same straight line with the valve stem respectively, and a detection gap 32 is formed at the position between the two positioning structures; the valve stem straightness detection mechanism includes a valve stem straightness Digital dial indicator 33 is used for detection, and digital dial indicator 33 has a matching section, and the matching section is fitted in a matching hole arranged on a dial indicator matching seat 34 of base plate seat 31, and the said cooperation is capable of following the digital dial gauge. Sliding fit for the sliding of the meter detection rod in the length direction, the dial gauge mating seat 34 is also provided with a dial gauge fixing structure for fixing the valve rod straightness detection with a digital dial gauge, and the digital dial gauge detection rod is perpendicular to the positioning The direction of the axis line of the rear valve stem is set against the position of the detection gap 32, and the front end of the detection rod of the digital dial indicator is formed with a detection end, which is used for contacting with the peripheral surface of the valve stem after positioning to realize detection.

In this way, during detection, the valve stem to be detected can be positioned on the two positioning surfaces of the two-stage positioning structure, and then the valve stem is pressed to form line contact with the two positioning surfaces respectively, and then the digital dial gauge is adjusted position, so that the detection end is in contact with the circumferential surface of the valve stem from the position of the detection notch and a certain amount of preload is generated, and then the digital dial gauge is fixed by the dial gauge fixing structure. At this time, while keeping the line contact between the valve stem and the two positioning surfaces, pull the valve stem along the length direction of the valve stem, and then observe the change of the digital dial gauge to obtain the straightness data of the valve stem. Among them, the matching hole level is set to make it easier to adjust and detect.

Wherein, the valve stem positioning fixture includes a first positioning block 35 and a second positioning block 36 which are in the shape of a rectangular block as a whole. The upper surface of the positioning block 35 and the abutting side of the second positioning block 36 form the two positioning surfaces, and the detection gap 32 is obtained by grooves on the upper surfaces of the first positioning block 35 and the second positioning block 36 .

This makes the structure simple, facilitates the processing and installation of the positioning structure, and makes two positioning surfaces formed in a horizontal direction and a vertical direction, and the two positioning surfaces are perpendicular to each other, so that the positioning is reliable and the accuracy of the mutual positional relationship is reliable.

Wherein, the valve stem locating fixture also includes a third locating block 37, and the third locating block 37 is fixed on the base plate seat 31 by means of screws, and the upper surface of the third locating block 37 is provided with a locating groove with a rectangular structure as a whole. The ground of the positioning groove is the reference plane of the positioning block arranged horizontally, and the width of the positioning groove is consistent with the sum of the widths of the first positioning block 35 and the second positioning block 36 along the direction perpendicular to the direction of the bonding side, so that the first positioning block 35 and the second positioning block 36 are consistent. The second positioning block 36 is sandwiched in the positioning groove, the bottom surface of the first positioning block 35 and the second positioning block 36 are attached to the reference surface of the positioning block, and the upper surface of the positioning groove is located on one side of the digital dial indicator. The position of the upper surface of the block.

In this way, when assembling, you only need to rely on the screws to complete the installation and fixation of the third positioning block, and then fit the first positioning block and the second positioning block into the positioning slot after being stuck together. The installation is very convenient and fast, and the first positioning block The assembly error between the block and the second positioning block can be determined by the cooperation between the third positioning block, which can more conveniently reduce the matching error and greatly improve the detection accuracy.

Wherein, it also includes a valve stem pressing device, the valve stem pressing device includes an elastic member 38 and a pressing member 39 arranged on the elastic member 38, the pressing member 39 is located at the angle opposite to the two positioning surfaces. Direction and under the action of the elastic force of the elastic member, it contacts and presses the circumferential surface of the valve stem part after positioning.

In this way, it is convenient to rely on the pressing device instead of human hands to apply a pressure to the positioned valve stem from the direction facing the angle between the two positioning surfaces, so that it forms a line contact with the two positioning surfaces. Just control and pull the valve stem to move axially. It can better liberate the operator and better ensure the detection accuracy.

Wherein, the elastic member 38 is an elongated elastic pressing block arranged obliquely, the lower end of the elastic pressing block is fixed on a pressing block mounting seat installed on the floor seat, and the pressing member 39 is installed on the upper end of the elastic pressing block.

In this way, the structure is simple, the installation is convenient and quick, and the implementation is easy.

Wherein, the middle part of the elastic briquetting block is curved downward, and the middle part of the upper end of the elastic briquetting block extends forward along the length direction to form a mounting shaft. The pressing member 39 is a roller body rotatably fitted on the mounting shaft. The peripheral surface of the cylinder is used to form a point contact with the peripheral surface of the post-positioned valve stem to achieve compression.

In this way, the roller body is used as the pressure member to form rolling friction to improve the smoothness of detection. At the same time, compared with the ball structure, the roller body is more convenient for its own assembly, and it can also better facilitate the positioning of the rear valve stem. The point contact compaction on the circumferential surface can better reduce the influence of the compaction process itself on the detection accuracy after the point contact compaction is formed.

Wherein, the valve stem pressing device is two arranged side by side in the length direction of the valve stem after being positioned along the valve stem, and the detection end of the digital dial indicator is located directly between the pressing members 39 of the two valve stem pressing devices. In this way, two compression points located on both sides of the digital dial indicator are formed, which can better maintain the compression while maintaining the balance and the flexibility of the valve stem movement, and better rely on the compression device to avoid the valve stem Head beat, improve detection accuracy.

Wherein, the matching section is formed on the fixed part of the detection rod rear end of the digital dial gauge 33, and the dial gauge fixing structure includes a dial gauge fixing screw 40 screwed on the dial gauge matching seat 34, Said dial gauge fixing screw 40 is arranged facing the matching hole on the dial gauge matching seat, and the front end is used to contact with the circumferential surface of the detection rod in the matching hole to realize fixing.

In this way, the utility model has the advantages of simple structure, convenient implementation, convenient and reliable sliding fit and fixing of the digital dial gauge.

Wherein, an extension block 41 is fixedly arranged forward along the axial direction on the movable section of the front part of the detection rod of the digital dial indicator, and a detection ball 42 is arranged at the front end of the extension block to form the detection end.

In this way, the length of the detection rod can be better extended, so that it can be detected smoothly, and at the same time, the corresponding size of the detection ball can be conveniently adjusted for different types of valve rods, so that the detection can be realized more smoothly, and the detection reliability can be improved.

Wherein, the middle part of the first half of the extension block 41 is provided with a vertical crack 43 along the length direction, and the gap makes the front half of the extension block form a left front half and a right front half, and the front end faces of the left front half and the right front half are integrally formed with The detection ball installation groove that is attached to the surface of the detection ball 42 to realize installation.

In this way, because the notch of the detection ball installation groove is generally equal to or slightly smaller than the spherical crown shape of the detection ball diameter to be able to clamp the detection ball, the gap separates the front half of the extension block to form the left front half and the right front half. , can rely on the elasticity of the left front half and the right front half to facilitate the detection of the embedded installation of the ball.

Wherein, at the inner end of the slit 43, there is also a circular expansion area space 44 that expands to both sides.

In this way, when the detection ball is installed, the elastically deformed position of the left front half and the right front half is located in the spatial position of the rear end expansion area, which can better ensure that the front end of the detection ball is restored and maintained to be able to clamp the detection circle. The state of the ball avoids the impact of elastic deformation on the detection accuracy of the front end of the left front half and the right front half, and improves the detection accuracy.

Among them, the middle part of the rear end face of the extension block 41 has a detection rod assembly hole arranged along the length direction. In the hole, and the front end of the detection rod is exposed in the expanded area space 44 of the gap. In this way, the assembly and alignment between the assembly hole of the detection rod and the extension block can be facilitated, so as to improve detection accuracy.

Wherein, the upper surface of the rear end of the extension block 41 is screwed with a detection rod fixing bolt 45, and the front end of the detection rod fixing bolt 45 is used to contact with the movable part of the front end of the detection rod of the digital dial indicator to realize fixing. In this way, the structure is simple, and the fixing of the detection rod is convenient and reliable.

Wherein, the front left half section and the right front half section are horizontally penetrated and screwed with elongated block fixing bolts 46 . In this way, after the detection ball is installed, the elastic deformation of the front ends of the left front half and the right front half along the left and right expansion directions can be restricted by the extension block fixing bolts, completely preventing the elastic deformation from affecting the detection accuracy.

The valve stem portion detection device of this embodiment also includes a valve stem end face runout detection device; the valve stem end face runout detection device is shown in Figure 3-4, including a base 1, and the base is provided with a valve positioning fixture and a valve rod end face runout detection device mechanism, the valve positioning fixture is used to realize the support and positioning of the valve stem along the horizontal direction, and the valve stem end face jump detection mechanism includes a lever dial gauge 21, and the measuring head of the lever dial gauge 21 is used for positioning the valve stem The end-face contact is realized for detection.

In this way, the valve relies on the rod to realize support and positioning on the valve positioning fixture, and then after the probe at the lower end of the lever dial gauge contacts the end face of the positioned valve rod, adjust the position of the valve rod so that the probe at the lower end of the lever dial gauge is formed. After a certain preload, the lever dial gauge will display the initial reading, and then hold the valve plate and slowly rotate the valve vertically to read the runout tolerance of the end surface of the valve stem from the lever dial gauge.

Wherein, the valve positioning fixture includes a rod peripheral surface support seat 3 arranged on the base along the same horizontal straight line. The supporting member on the peripheral surface of the rod part is used for contacting with both sides of the lower part of the peripheral surface of the rod part to realize supporting positioning.

In this way, the structure of the valve positioning fixture is simple, the positioning is convenient and quick, and it is beneficial to the realization of detection.

Wherein, the support member on the peripheral surface of the rod portion includes two pairs of support spheres 5 that are equivalent and horizontally arranged in pairs. The upper half of the opposite side of each supporting sphere is used for contacting with the circumferential surface of the rod to realize supporting positioning.

In this way, two pairs of supporting spheres arranged in pairs are used to realize the contact support on the circumferential surface of the rod, so that the rod and the supporting member are in point contact, which can prevent the axis line from being distorted due to the irregularity of the rod itself to the greatest extent. On a straight line, the detection error is further increased, and the detection accuracy is improved. Using two pairs of support spheres can ensure support stability. Of course, V-shaped positioning blocks can also be used to realize the support and positioning of the rod during implementation, but this structure is that the two positioning surfaces are in contact with the rod. If the rod itself is irregular, or the positioning surface itself is not flat enough, it will cause the rod to When the head rotates, the axis line is not in a straight line, which will lead to an increase in the detection error.

Wherein, two pairs of supporting spheres 5 are respectively arranged on an independent supporting base 3 on the circumferential surface of the rod, and the lever dial gauge 21 is arranged on a straight line between the two pairs of supporting spheres. In this way, compared with the use of one supporting seat, the material is saved, the supporting force is convenient, and at the same time, it is beneficial to adjust the position between the two pairs of supporting spheres to facilitate detection.

Wherein, in the center of the upper end of the supporting seat 3 on the circumferential surface of the rod, there is a supporting sphere installation groove with a rectangular horizontal section, and the supporting spheres 5 are installed in pairs in the supporting sphere installation groove, and the paired two supporting spheres are arranged in close contact with each other. The four supporting spheres and the mounting grooves are provided adjacent to each other. In this way, only two equivalent support spheres need to be put into the support sphere installation groove, and they can be automatically positioned in a horizontally adhering state without adjustment, and the installation and use are very fast and convenient.

Wherein, any rod portion circumferential surface support seat is also provided with a rod portion pressure mechanism, the rod portion pressure mechanism includes an elastic piece 6, one end of the elastic piece 6 is fixed on the pole portion circumferential surface support seat, and the other One end is provided with a pressing piece located above the connecting line between the two pairs of supporting spheres, and the pressing piece is used to contact and press the upper surface of the positioned rod.

In this way, a simple structure is used to apply a pressure to the upper surface of the rod, which can prevent the rod from bouncing and moving due to excessive force or unbalanced force applied when the valve is rotated manually during the detection process, and better ensure reliable detection accuracy.

Wherein, the pressing member is a roller sleeve 7 rotatably installed on the elastic sheet, and the axial direction of the roller sleeve 7 is consistent with the axial direction of the rod after installation and positioning. In this way, the contact area between the pressing part and the rod part is reduced, and the rolling friction between the two during detection can better reduce the influence of the pressing part on the detection.

Wherein, the valve rod end face beating detection mechanism also includes a rod end face positioning seat 4, and the rod end face positioning seat 4 is provided with a rod end face limiting member for abutting against the rod end face to limit the position; the rod end face limiting member It is a horizontally arranged push rod 8, one end of the push rod 8 has a conical top and the top is used to contact and limit the position of the center of the end face of the rod after positioning; the lever dial gauge 21 is installed and fixed on the top. On the rod 8, and the measuring head of the lever dial indicator 21 is located at the front side of the range where the radius of the circle at the top of the push rod is the radius of the rod end face circle.

In this way, relying on the contact limit between the top and the center of the end face of the rod, the axial limit of the valve stem can be guaranteed, and the axial displacement caused by the unbalanced force applied when rotating the valve stem can be avoided, which will affect the detection results. And more importantly, the limit structure can better ensure that the position of the axis line remains unchanged during the rotation of the rod, so it will not affect the detection of the beating of the end face of the rod by the lever dial gauge, so it can better ensure the detection precision.

The push rod 8 is provided with a lever dial indicator mounting seat 22, and the lever dial indicator mounting seat 22 is horizontally provided with a ejector rod assembly hole, and a ejector rod clamping seam is arranged vertically downward below the ejector rod assembly hole. , the lever dial indicator mount 22 on one side of the jack rod clamping seam is provided with a mounting seat fixing bolt 23, and the mounting seat fixing bolt 23 can slide horizontally through the lever dial gauge mounting seat on one side of the ejector rod clamping seam and The thread is screwed into the threaded hole on the inner wall on the other side of the clamping seam of the ejector rod, and the mounting seat 22 of the lever dial gauge is slidably fitted on the ejector rod 8 by relying on the mounting hole of the ejector rod and can be fixed by means of the fixing bolt of the rotating mounting seat. ; The lever dial gauge is fixedly installed on the upper surface of the lever dial gauge.

In this way, the axial position of the lever dial indicator on the ejector rod can be adjusted more conveniently, so that the measuring head of the lever dial indicator can be accurately located in front of the range where the top of the ejector rod takes the radius of the end face circle of the rod as the radius. Adjacent to the side for smooth detection.

Wherein, a jack rod mounting column 9 is arranged vertically upward on the positioning seat of the end face of the pole part, and the ejector pin 8 horizontally runs through a jack pin mounting hole on the upper part of the ejector pin mounting column, and a ejector pin is screwed on the upper part of the ejector pin mounting column. The fixing bolt, the front end of the fixing bolt of the ejector rod and the ejector rod in the installation hole of the ejector rod abut to realize the fixing of the ejector rod. In this way, the front and rear positions of the push rod can be conveniently installed and adjusted.

Wherein, the lower end of the ejector rod installation column is plugged and installed in a vertical ejector rod installation column socket on the end face positioning seat of the rod part, and the end face positioning seat of the rod part is also directly opposite to the ejector rod installation column socket and is horizontally threaded. The positioning bolt of the ejector rod installation column, the front end of the ejector rod installation column positioning bolt and the ejector rod installation column are abutted and fixed. In this way, it is convenient to adjust the upper and lower positions of the ejector rod installation column, and then adjust the height of the ejector rod. It is only necessary to ensure that the axis line of the ejector rod and the middle of the two pairs of supporting spheres are in the same vertical plane during design and production, and the installation is more convenient and quick. Correctly adjust the top of the ejector rod to contact and locate the center of the end face of the rod after positioning.

Wherein, the upper surface of the base is provided with a dovetail groove 10 along the valve positioning direction, and the lower ends of the support seat 3 on the circumferential surface of the rod portion and the positioning seat 4 on the end face of the rod portion are each downwardly provided with a block matching with the dovetail groove 10 to slidably cooperate. In the dovetail groove, the supporting seat on the circumferential surface of the rod portion and the positioning seat on the end face of the rod portion are also vertically penetrated and screwed with fixing bolts of the supporting seat to realize locking and fixing.

In this way, it is convenient to adjust the mutual distance between the supporting seats on the circumferential surface of the two rod parts and the positioning seat on the end face of the rod part, so as to facilitate detection.

Claims (10)

1. a kind of engine valve stem detection device, including engine valve stem linearity testing apparatus, engine valve stem linearity testing apparatus Including bottom block, it is characterised in that be provided with engine valve stem positioning fixture and engine valve stem straightness detection mechanism on bottom block, The engine valve stem positioning fixture includes the location structure that two sections of length directions of following wind one are set, and every section of location structure includes two The intersecting locating surface in angle, two locating surfaces of two location structures each can be used in being formed on same straight line with valve stem Linear contact lay, the position between two sections of location structures is formed with a detection breach；The engine valve stem straightness detection mechanism Including an engine valve stem Linearity surveying digital dial gauge, digital dial gauge has a horizontally disposed cooperation section, matched somebody with somebody Close section coordinate in the mating holes being arranged on an amesdial matching seat of bottom block, it is described be combined into can along numeral thousand points What table detection bar length direction was slided is slidably matched, and is additionally provided with amesdial matching seat to engine valve stem Linearity surveying number The amesdial fixed structure that word amesdial is fixed, valve stem axial line side of the digital dial gauge detection bar after positioning To and just detection gap position is being set, and digital dial gauge detection bar front end is formed with a test side, and the test side is used for Detection is realized with valve stem peripheral surface contact after positioning.

2. engine valve stem detection device as claimed in claim 1, it is characterised in that engine valve stem positioning fixture includes entirety and is in The first locating piece and the second locating piece of rectangular block shape structure, the first locating piece and the laminating of the second locating piece horizontal direction are set simultaneously Laminating side side fixed on bottom block so that the first locating piece upper surface and the second locating piece forms described two locating surfaces, The detection breach is obtained by the groove of the first locating piece and the second locating piece upper surface.

3. engine valve stem detection device as claimed in claim 2, it is characterised in that engine valve stem positioning fixture also includes one 3rd locating piece, the 3rd locating piece is fixed on bottom block by screw, the 3rd locating piece upper surface be provided with one it is whole The locating slot of the rectangular body structure of body, locating slot ground is horizontally disposed locating piece reference plane, and positioning well width and first are determined Position block and the second locating piece are consistent along the width sum perpendicular to its side side surface direction of fitting so that the first locating piece and second is determined Position block is located in locating slot, and the first locating piece and the second locating piece bottom surface and the laminating of locating piece reference plane, locating slot are located at number The overhead surface of the side position of word amesdial one is less than the first locating piece upper surface location.

4. engine valve stem detection device as claimed in claim 1, it is characterised in that also including engine valve stem pressing device, gas Door rod portion pressing device includes an elastic component and an applicator member being arranged on elastic component, and applicator member is located at two Individual locating surface angle just to direction on and elastic component elastic force effect under and positioning after engine valve stem peripheral surface contact Compress.

5. engine valve stem detection device as claimed in claim 4, it is characterised in that elastic component is angularly disposed strip Elastic press, elastic press lower end is fixed on one and is installed in a briquetting mounting seat of bottom block, elastic press upper end The applicator member is installed.

6. engine valve stem detection device as claimed in claim 5, it is characterised in that curved arc under being in the middle part of elastic press, Extension is formed with installation rotating shaft to elastic press upper center forward along the length direction, and the applicator member is to be rotatably engaged Roller body in rotating shaft is installed, pressure is realized in the contact of engine valve stem peripheral surface formation point after roller body peripheral surface is used for and positioned Tightly.

7. engine valve stem detection device as claimed in claim 1, it is characterised in that the cooperation section is formed at digital dial gauge Detection rod rear end fixed part on, the amesdial fixed structure includes be arranged on amesdial matching seat one thousand of spinning Divide table fixing screws, just the mating holes on amesdial matching seat is set for the amesdial fixing screws and front end is used for and coordinated Detection bar peripheral surface contact in hole, which is realized, to be fixed.

8. engine valve stem detection device as claimed in claim 1, it is characterised in that digital dial gauge detection bar front portion active segment On be fixedly installed a lengthening block forward in the axial direction, lengthen block front end and be provided with a detection ball and form the detection End.

9. engine valve stem detection device as claimed in claim 8, it is characterised in that lengthen in the middle part of block front half section along its length Vertical crack is provided with, crack make it that lengthening block front half section forms left front half section and right front half section, the left front half section and the right side It is integrally formed in the front end surface of front half section for realizing the detection ball mounting groove installed with detection ball surface laminating.

10. engine valve stem detection device as claimed in claim 1, it is characterised in that also including valve stem end surface glitch detection Device, the valve stem end surface jitter detection apparatus includes being provided with valve positioning fixture and valve stem end surface on base, base Glitch detection mechanism, the valve positioning fixture is used to realize the supporting positioning of engine valve stem in the horizontal direction, valve stem end surface Glitch detection mechanism includes dial test indicator, the gauge head of dial test indicator be used for and position after engine valve stem end contact Realize detection；The valve positioning fixture includes the bar portion peripheral surface support base being arranged on along same level straight line on base, The bar portion peripheral surface for carrying out upward support positioning to bar portion peripheral surface is provided with bar portion peripheral surface support base Supporting member, bar portion peripheral surface supporting member is used for and the side contacts of bar portion peripheral surface bottom two realize support positioning.