CN108955502B - Valve disc end face accuracy detection method - Google Patents

Abstract

The invention discloses a method for detecting the end face accuracy of a valve disc, which is characterized in that it comprises the step of detecting the flatness of the end face of the valve disc. When detecting the flatness of the end face of the valve disc, the end face of the valve disc and a detection plane are fitted together, and the flatness of the end face of the valve disc is detected, and the flatness of the end face of the valve disc is to be fitted along a straight line. Sliding through the upper end contact of a dial gauge detection rod exposed on the detection plane, read the maximum difference of the dial gauge for flatness detection to obtain the flatness of the valve disc end face. The method also includes the step of detecting the circular runout tolerance of the valve disc end face. The invention can be used to realize the detection of the flatness of the valve end face, and has the advantages of simple implementation, convenient and quick operation, accurate and reliable detection results, and the like.

Description

Valve disc end face accuracy detection method

technical field

The invention relates to the technical field of production and detection of automobile engine parts, in particular to a method for detecting the end face accuracy of a valve disc.

Background technique

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

In an automobile engine, the intake and exhaust valve is a component composed of a disc portion and a rod portion that is coaxially arranged with the disc portion. The key basic parts that seal the intake and exhaust ports during the work process are used to block the airflow passages and control the gas exchange of the engine. During each operation of the engine, the intake and exhaust valves are opened and closed once. When the valve opens and closes, the valve is subjected to the pressure of the valve spring and the pressure of the seat. In particular, the intake and exhaust valves act to seal the combustion chamber during the compression and power strokes. Therefore, the quality of the valve has an important influence on the performance and life of the engine.

The machining accuracy and structure of the valve play a pivotal role in the movement of the engine valve train, and the end face error of the valve is a key parameter of the valve, which is closely related to the valve sealing effect.

The flatness tolerance of the valve disc end face is to compare the surface of the valve disc with the ideal plane, and the line value distance between the two is the flatness tolerance value; generally by measuring the relative height difference of several points on the actual surface of the valve disc, and then Converts the flatness error value in line values. If the flatness error exceeds the specified standard, it will cause a large error in the processing and detection of the valve cone surface of the valve, which will seriously affect the air tightness of the valve and the normal operation of the engine. In the existing valve manufacturers, some valve manufacturers mainly rely on the flatness measuring instrument to test the flatness of the valve disc end face. Due to the high cost and long time required for inspection, the inspection of the straightness of the valve stem and the number of inspections and batches are very limited.

In addition, the end face circular runout tolerance of the valve is also a key parameter of the valve, which is closely related to the valve sealing effect. The valve disc end face circular runout tolerance is a positional tolerance item used to control the surface profile elements of the valve disc end face to maintain a certain accuracy relative to the valve axis. The runout tolerance is different from the orientation and positioning tolerance, which is a given tolerance item based on a specific detection method. Because the runout tolerance has a comprehensive control effect on the measured elements, that is, it not only controls the position error, but also controls a certain shape error; it can fully reflect the functional requirements of the parts, so it is widely used in production. In the existing valve manufacturers, some valve manufacturers mainly rely on the runout detector to detect the runout of the valve disc end face. Due to the high cost and long time required for inspection, the number and batches of valve end face runout inspections are very limited.

Therefore, how to design a valve disc end face accuracy detection method that is simple to implement, convenient and quick to operate, and reliable to detect to realize the detection of valve end face parameters has become a problem to be considered and solved.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is: how to provide a valve disc end face accuracy detection method that is simple to implement, convenient and quick to operate, can be used to detect the valve end face accuracy parameters, and has accurate and reliable detection results.

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

A method for detecting the end face accuracy of a valve disc, which is characterized in that it includes the step of detecting the flatness of the end face of the valve disc, and when detecting the flatness of the end face of the valve disc, the end face of the valve disc is attached to a detection plane, and slides in a linear direction through the exposed surface of the valve disc. One of the flatness detection of the detection plane uses a dial gauge to detect the contact on the upper end of the rod, and the flatness of the valve disc end face is obtained by converting the maximum difference value of the dial gauge to read the flatness detection.

In this way, by adopting the method, the detection of the flatness of the end face of the valve disc can be realized conveniently and quickly, and the implementation is simple and the operation is convenient and fast.

The step of detecting the flatness of the valve disc end face is realized by a valve disc end face flatness detection device. The valve disc end face flatness detection device includes a detection table, the upper surface of the detection table is a horizontal detection plane, and the detection plane is formed upward. A vertical first standard abutting surface, and a vertical second standard abutting surface, the second standard abutting surface and the first standard abutting surface are arranged vertically and the distance is smaller than the radius of the valve disc end face, on the detection plane There is also a detection hole, the distance between the detection hole and the first standard abutting surface is within the diameter of the end face of the valve disc, and the distance between the detection hole and the second standard abutting surface is greater than or equal to the diameter of the end face of the valve disc. A dial indicator for flatness detection, the detection rod of the dial indicator for flatness detection is set vertically upward, and the upper end contact of the detection rod of the dial indicator for flatness detection is exposed in the detection hole and the exposed height is greater than the end face of the valve disc Flatness tolerance range.

In this way, when using, it is only necessary to fit the end face of the valve disc to be detected on the detection plane, and then make one side of the valve disc fit with the first standard abutting surface, and move the valve disc in the direction of the second standard abutting surface. Until the contact on the upper end of the detection rod of the dial gauge for flatness detection passes through the entire end face of the valve disc and abuts against the second standard abutment surface, the flatness of the end face of the valve disc can be obtained by reading the maximum difference on the dial gauge. , the valve angle can be adjusted horizontally after one test and then tested multiple times to improve the accuracy. Therefore, the device has the advantages of simple structure, convenient and quick operation, accurate and reliable structure.

As an optimization, the distance between the detection hole and the first standard abutting surface is the same on the valve disc end face circle radius. In this way, the upper end contact of the detection rod of the dial indicator for flatness detection can be passed through the diameter direction of the end face circle of the valve disc during detection, so as to better improve the detection accuracy.

As an optimization, a first standard block is provided on the detection table, one side of the first standard block constitutes the first standard abutting surface, and a long strip-shaped The first standard block positioning hole, the first standard block positioning hole is fitted with a first standard block fixing bolt that is inserted downwardly into the corresponding through hole on the detection table and realizes the fixation of the first standard block.

In this way, the distance from the first standard block to the detection hole can be adjusted to make it suitable for valve detection of different models and sizes.

Further, the first standard block positioning holes are two parallel and spaced. In this way, it is possible to avoid rotation when the first standard block is adjusted, and to ensure that the adjustment direction is the movement adjustment in the direction facing the detection hole.

As an optimization, a second standard block is provided on the detection table, one side of the second standard block constitutes the second standard abutting surface, and a long strip-shaped The second standard block positioning hole is fitted with a second standard block fixing bolt which is inserted downward into the corresponding through hole on the detection table and realizes the fixing of the second standard block.

In this way, the distance from the second standard block to the detection hole can be adjusted to make it suitable for valve detection of different models and sizes.

Further, the positioning holes of the second standard block are two arranged in parallel and at intervals. In this way, it is possible to avoid rotation when the second standard block is adjusted, and to ensure that the adjustment direction is the movement adjustment in the direction facing the detection hole.

As an optimization, a dial indicator fixing block is arranged on the inspection table under the inspection hole, and a dial indicator assembly hole facing the inspection hole is vertically penetrated through the dial indicator fixing block. The flatness inspection uses a dial indicator. The fixed part of the detection rod and the dial is installed through the dial indicator assembly hole, and the dial indicator fixing block is also provided with a fastening screw hole on the side of the dial indicator assembly hole. Fastening bolts are used to fix the dial indicator for flatness detection.

In this way, loosen the fastening bolts, you can adjust the height of the dial indicator for flatness detection up and down, and then adjust the height range of the contact at the upper end of the detection rod of the dial indicator for flatness detection exposed to the detection hole, so that it is suitable for different types of valves. Detection of different valve disc end face flatness tolerance range.

As an optimization, the detection table includes a detection board arranged horizontally above, the upper surface of the detection board is the detection plane, two sides of the detection board are provided with support plates vertically downward, and the lower end of the support plate is fixed on a horizontally arranged bottom plate. The dial indicator for flatness inspection is located between the base plate and the inspection plate. In this way, the structure of the detection table is simpler, stable and reliable.

As an optimization, the present invention also includes the step of detecting the circular runout tolerance of the end face of the valve disc, and the step of detecting the circular runout tolerance of the end face of the valve disc is realized by a valve disc end face circular runout detection device, and the valve disc end face circular runout detection device includes a base, A valve positioning mechanism and a valve disc end face circular runout detection mechanism are arranged on the base; the valve positioning mechanism is used to realize the horizontal positioning of the valve to be detected and realize the single-sided limit of the positioned valve in the axial direction away from the valve plate direction. The valve disc end face circular runout detection mechanism includes a dial gauge mounting seat, a dial gauge set horizontally is installed on the dial gauge mounting seat, and the dial gauge contact is offset from the positioned valve disc end face. The position of the detection point of the center of the circle is set, and the dial gauge mounting seat is provided with a dial gauge adjustment mechanism for adjusting the fixed position of the dial gauge along the axial direction.

In this way, when the circular runout tolerance of the end face of the valve disc is detected, the valve to be detected is horizontally positioned by the valve positioning mechanism and realizes the unilateral limit on the axial direction of the valve away from the direction of the valve disc, so that the axial position of the dial indicator is adjusted so that the contact and the After positioning, the detection point on the end face of the valve disc contacts and generates a certain pre-pressure. The pre-pressure reading is greater than the limit value of the circular runout tolerance of the end face of the valve disc. Rotate the valve once, and read the dial gauge to display the difference between the maximum and minimum readings, which is the runout tolerance of the valve disc end face of the valve. Therefore, it has the advantages of simple structure, low cost, convenient and quick detection, accurate and reliable.

As an optimization, the dial indicator adjustment mechanism includes a vertical rod vertically arranged on the dial indicator mounting seat, and a dial indicator mounting hole is horizontally opened in the middle of the vertical rod. The fixed part is inserted into the mounting hole of the dial indicator, the floating part used to set the contact on the detection rod of the dial indicator protrudes from the mounting hole of the dial indicator, and the vertical rod above the mounting hole of the dial indicator has an opening upward. The vertical rods on both sides of the slit are provided with clamping bolt holes and corresponding clamping bolts along the vertical direction of the slit, and the clamping bolts are used to clamp the slit to realize the fixation of the dial indicator.

In this way, after loosening the clamping screw, you can adjust the front and rear positions of the dial indicator detection rod and the dial indicator installation hole, and then fix it after adjusting it in place, so as to ensure that the installation position of the dial indicator can produce a certain shape on the end face of the valve disc after positioning. pre-pressure. At the same time, the structure has the advantages of simple structure, convenient and quick adjustment, and the like.

As an optimization, the valve positioning mechanism includes a valve positioning seat, the upper surface of the valve positioning seat is provided with a positioning groove that runs through the front and rear directions, the positioning groove is used to realize the positioning of the valve along the length direction of the positioning groove, and the valve positioning seat has a The vertical adjustment plate installation plane is located on the front side of the positioning groove. The left and right sides of the adjustment plate installation plane located in the front side of the positioning groove are each provided with a positioning screw hole, and the left and right sides of the front side of the positioning groove are also provided with a vertical The adjustment plate, the rear side of the adjustment plate is attached to the installation plane of the adjustment plate, the opposite inner sides of the two adjustment plates are vertical limit surfaces, the corresponding positioning screw holes on the adjustment plate are provided with horizontal elongated holes, and two The positioning bolts pass through the corresponding elongated holes and positioning screw holes to fix the adjustment plate.

In this way, when using, first loosen the positioning bolt, position the valve in the positioning slot and the valve disc extends out of the positioning slot, then move the adjusting plate in the left and right direction to make the limit surface contact the conical surface behind the valve disc, and then lock By tightening the positioning bolts to fix the adjusting plate, the axial limit of the valve can be realized conveniently and quickly. In this way, the limit is achieved by the contact between the adjusting plate and the conical surface behind the valve disc. Since the valve is generally produced, the conical surface is formed by the inner cavity of the lower die, and the end face of the valve disc is formed by punching, so the cone is formed by punching. The accuracy of the profile surface will be much higher than that of the valve disc end face. Therefore, the limit is achieved by the point contact between the limiting surface of the adjusting plate and the conical surface behind the valve disc, and then during the valve rotation process, the contact position between the limiting surface of the adjusting plate and the conical surface behind the valve disc is rotated to form a circular line, which can ensure The accuracy of the contact circle line reduces the error and better ensures that the detection result is the data reflecting the flatness of the valve disc end face.

Further, two positioning rollers are arranged in the positioning groove along the front and rear directions, the two positioning rollers are arranged side by side along the width direction of the positioning groove, and a clamping groove for positioning the valve is formed between the upper surfaces of the two positioning rollers, and one side of the positioning groove is The valve positioning seat is provided with roller adjusting screw holes horizontally along the direction perpendicular to the positioning groove. .

In this way, the positioning of the valve is realized by means of two positioning rollers, the structure is simple, and the positioning is convenient, fast and reliable. The two roller adjusting bolts set at the same time can adjust the tightness between the two rollers, and then adjust the width of the clamping groove formed between the upper surfaces of the two positioning rollers, and then adjust the height of the positioning valve, so in the dial indicator When the height position is fixed, it is convenient to adjust the valve height position to ensure that the contact point between the dial indicator and the end face of the valve disc is the position suitable for the detection of the end face circle runout, which ensures the detection accuracy and has the advantages of convenient and quick adjustment.

Further, the roller adjusting screw hole is arranged in the position facing the axis line of the positioning roller. In this way, it is more convenient for the positioning roller to contact and apply force when adjusting the tightness of the roller.

Further, the length of the positioning roller is smaller than the length of the rod portion of the valve to be detected. In this way, when the valve is rotated during the detection process, the valve stem can be rotated by the part where the tail end of the valve rod extends out of the positioning roller and is suspended in the air, which is more convenient to rotate the valve and can better ensure that the positioning state of the valve remains unchanged during rotation, so as to improve the detection accuracy. .

Further, the edge of the front end face of the positioning drum is provided with a chamfer. In this way, the front end surface of the positioning roller and the tapered surface behind the valve disc of the valve to be tested can be prevented from interfering with each other and affecting the detection accuracy.

Further, an adjustment plate centering adjustment structure is also provided, and the adjustment plate centering adjustment structure includes two adjustment nuts correspondingly arranged in front of the two adjustment plates. The screw holes of the adjustment nuts are horizontally arranged along the width direction of the positioning groove, and the adjustment The nuts are respectively fixed on a nut seat, the adjustment plate corresponding to the nut seat is provided with a nut fixing screw hole, the nut seat is provided with a horizontal elongated hole corresponding to the nut fixing screw hole, and a nut fixing bolt is also arranged to pass through the nut seat The long strip hole and the corresponding nut fixing screw hole realize the fixing of the nut seat on the corresponding adjusting plate; the centering adjustment structure of the adjusting plate also includes a two-way lead screw, and two sections of external threads are symmetrically arranged on the two-way lead screw. Screw in the two adjusting nuts.

In this way, it is possible to rely on the adjustment plate centering adjustment structure for centering before testing, and adjust when testing different types of polished rods. Specifically, when aligning, first loosen the nut fixing bolts and the positioning bolts, and then determine the positions of the two positioning rollers, place a polished rod between the two positioning rollers for positioning, and then move the two adjusting plates to make the two positioning rollers. The relative limit surfaces of the adjustment plates are in contact with the polished rod, then rotate the positioning bolt to fix the adjustment plate, then rotate the nut fixing bolt to fix the nut seat, and remove the polished rod to achieve alignment. When testing valves of different sizes after centering, the two adjusting plates can be moved in the same direction or separated in opposite directions following the corresponding adjusting nuts by rotating the two-way screw, so as to adjust the two adjusting plates according to the valves of different sizes. The width distance between the plates makes it contact with the tapered position of the rear end of the valve disc of the valve to be inspected to realize inspection and ensure inspection accuracy. In this way, it is ensured that the two adjustment plates can be quickly adjusted under the condition that the two adjustment plates are kept centered, and the convenience and reliability of the adjustment in use are improved.

Further, a rotating knob is provided at one end of the bidirectional screw. This makes it easy to rotate and adjust.

Further, a lead screw seat is arranged in the middle of the bidirectional lead screw, the lead screw seat is fixed on the base, a lead screw through hole is horizontally penetrated through the lead screw seat, and the bidirectional lead screw is rotatably fitted in the lead screw through hole.

In this way, the height position of the lead screw is fixed by the lead screw seat, which makes the adjustment operation more convenient, and avoids the displacement of the adjustment plate caused by the adjustment of the lead screw and affects the subsequent detection accuracy.

Furthermore, an axial position limiting structure of the lead screw is arranged between the lead screw seat and the lead screw to limit the axial displacement of the lead screw. In this way, the left and right positions of the lead screw can be better restricted, and the left and right displacement of the lead screw during adjustment can be avoided to drive the adjustment plate to move, thereby ensuring the symmetry and reliability of the adjustment. During implementation, the axial position limiting structure of the lead screw can be obtained by a concave-convex matching structure arranged in the circumferential direction between the inner wall of the through hole of the lead screw and the corresponding outer wall of the lead screw.

In summary, the present invention can be used to detect the flatness of the valve end face and the circular runout tolerance of the valve end face, and has the advantages of simple implementation, convenient and quick operation, accurate and reliable detection results, and the like.

Description of drawings

FIG. 1 is a schematic three-dimensional structure diagram of a valve disc end face flatness detection device adopted in the present invention.

FIG. 2 is a front view of the valve disc end face flatness detection device of FIG. 1 .

FIG. 3 is a top view of FIG. 2 .

FIG. 4 is a schematic three-dimensional structure diagram of the valve disc end face circular runout detection device adopted in the present invention.

Detailed ways

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

Embodiment: The valve disc end face accuracy detection method of this embodiment includes the steps of detecting the flatness of the valve disc end face and the step of detecting the circular runout tolerance of the valve disc end face, which adopts the valve disc end face flatness detection device shown in FIGS. 1-3 . And a valve disc end face circular runout detection device shown in FIG. 4 realizes detection. The former is used to realize the flatness detection of the valve disc end face, and the latter is used to realize the circular runout tolerance detection of the valve disc end face.

More specifically, the valve disc end face flatness detection device is shown in Figures 1-3, including a detection table, the upper surface of the detection table is a horizontal detection plane 1', and a vertical detection plane 1' is formed upward in the detection plane 1'. The first standard abutting surface, and a vertical second standard abutting surface, the second standard abutting surface and the first standard abutting surface are arranged vertically and the distance is smaller than the radius of the valve disc end face, and a detection plane is also provided on the detection plane. Hole 2', the distance between the detection hole 2' and the first standard abutting surface is within the diameter of the end face of the valve disc, the distance between the detection hole and the second standard abutment surface is greater than or equal to the diameter of the end face of the valve disc, and a A dial indicator 3' for flatness detection, the detection rod of the dial indicator 3' for flatness detection is set vertically upward, and the upper contact of the detection rod of the dial indicator for flatness detection is exposed in the detection hole 2' and The exposed height is greater than the flatness tolerance range of the valve disc end face.

In this way, when testing the flatness of the end face of the valve disc, it is only necessary to fit the end face of the valve disc to be detected on the detection plane, and then make one side of the valve disc fit with the first standard abutting surface, and then make it to the second standard abutting surface. Move the valve disc in the direction until the upper end contact of the detection rod of the dial gauge for flatness detection passes through the entire end face of the valve disc and abuts against the second standard abutting surface, and the plane of the end face of the valve disc can be obtained by reading the maximum difference on the dial gauge. When the specific operation is performed, the valve angle can be adjusted by horizontal rotation after one detection, and then multiple detections can be performed to improve the accuracy. Therefore, the device has the advantages of simple structure, convenient and quick operation, accurate and reliable structure.

Wherein, the distance between the detection hole 2' and the first standard abutting surface is the same on the valve disc end face circle radius. In this way, the upper end contact of the detection rod of the dial indicator for flatness detection can be passed through the diameter direction of the end face circle of the valve disc during detection, so as to better improve the detection accuracy.

Wherein, a first standard block 4' is arranged on the detection table, one side of the first standard block 4' constitutes the first standard abutting surface, and the first standard block 4' is arranged perpendicular to the first standard abutting surface There is an elongated first standard block positioning hole, and the first standard block positioning hole is fitted with a first standard block fixing bolt 5' that is inserted downward into the corresponding through hole on the detection table, and realizes the positioning of the first standard block. fixed.

In this way, the distance from the first standard block to the detection hole can be adjusted to make it suitable for valve detection of different models and sizes.

Wherein, the first standard block positioning holes are two juxtaposed and spaced. In this way, it is possible to avoid rotation when the first standard block is adjusted, and to ensure that the adjustment direction is the movement adjustment in the direction facing the detection hole.

Wherein, a second standard block 6 ′ is arranged on the test table, one side of the second standard block 6 ′ constitutes the second standard abutting surface, and a length of the second standard block is perpendicular to the second standard abutting surface. The bar-shaped second standard block positioning hole is fitted with a second standard block fixing bolt 7' inserted downwardly into the corresponding through hole on the inspection platform to realize the fixation of the second standard block.

In this way, the distance from the second standard block to the detection hole can be adjusted to make it suitable for valve detection of different models and sizes.

Wherein, the positioning holes of the second standard block are two arranged in parallel and at intervals. In this way, it is possible to avoid rotation when the second standard block is adjusted, and to ensure that the adjustment direction is the movement adjustment in the direction facing the detection hole.

Among them, a dial indicator fixing block 8 ′ is arranged on the detection table under the detection hole, and a dial indicator assembly hole facing the detection hole is vertically penetrated in the dial indicator fixing block 8 ′. The part where the detection rod of the dial indicator 3' is fixed to the dial is installed through the dial indicator assembly hole, and the dial indicator fixing block 8' is also provided with a fastening screw hole on the side of the dial indicator assembly hole. Fastening bolts 9' are fitted in the screw holes for fixing the dial indicator for flatness detection.

In this way, loosen the fastening bolts, you can adjust the height of the dial indicator for flatness detection up and down, and then adjust the height range of the contact at the upper end of the detection rod of the dial indicator for flatness detection exposed to the detection hole, so that it is suitable for different types of valves. Detection of different valve disc end face flatness tolerance range.

The detection table includes a detection board 12 ′ horizontally arranged above, the upper surface of the detection board 12 ′ is the detection plane 1 ′, a supporting board 10 ′ is vertically arranged on both sides of the detection board, and the lower end of the supporting board 10 ′ is fixed on the On a horizontally arranged bottom plate 11', the flatness detection dial indicator is located between the bottom plate and the detection plate. In this way, the structure of the detection table is simpler, stable and reliable.

As shown in Figure 4, the valve disc end face circular runout detection device includes a base 1, wherein the base 1 is provided with a valve positioning mechanism and a valve disc end face circular runout detection mechanism; the valve positioning mechanism is used to realize the horizontal positioning of the valve to be detected. And realize the unilateral limit of the positioned valve in the axial direction away from the direction of the valve disc, the valve disc end face circular runout detection mechanism includes a dial indicator mounting seat 2, and a dial indicator mounting seat 2 is installed on it. The dial indicator 3 is set horizontally and the contact of the dial indicator is set at the position of the detection point deviated from the center of the valve disc on the end face to be positioned. Dial indicator adjustment mechanism.

In this way, when the circular runout tolerance of the end face of the valve disc is detected, the valve to be detected is horizontally positioned by the valve positioning mechanism and realizes the unilateral limit on the axial direction of the valve away from the direction of the valve disc, so that the axial position of the dial indicator is adjusted so that the contact and the After positioning, the detection point on the end face of the valve disc contacts and generates a certain pre-pressure. The pre-pressure reading is greater than the limit value of the circular runout tolerance of the end face of the valve disc. Rotate the valve once, and read the dial gauge to display the difference between the maximum and minimum readings, which is the runout tolerance of the valve disc end face of the valve. Therefore, it has the advantages of simple structure, low cost, convenient and quick detection, accurate and reliable.

Wherein, the dial indicator adjustment mechanism includes a vertical rod 4 vertically arranged on the dial indicator mounting seat, and a dial indicator mounting hole is horizontally opened in the middle of the vertical rod 4, and the detection rod of the dial indicator 3 and The fixed part of the dial is inserted into the mounting hole of the dial indicator. The floating part used to set the contacts on the detection rod of the dial indicator 3 protrudes from the mounting hole of the dial indicator, and the vertical rod above the mounting hole of the dial indicator is upward. There are slits, and the vertical rods on both sides of the slit are provided with clamping bolt holes and corresponding clamping bolts 5 along the vertical direction of the slits. The clamping bolts 5 are used to clamp the slits to realize the dial indicator. 3 fixed.

In this way, after loosening the clamping screw, you can adjust the front and rear positions of the dial indicator detection rod and the dial indicator installation hole, and then fix it after adjusting it in place, so as to ensure that the installation position of the dial indicator can produce a certain shape on the end face of the valve disc after positioning. pre-pressure. At the same time, the structure has the advantages of simple structure, convenient and quick adjustment, and the like.

Wherein, the valve positioning mechanism includes a valve positioning seat 6, the upper surface of the valve positioning seat 6 is provided with a positioning groove penetrating in the front-rear direction, the positioning groove is used to realize the positioning of the valve along the length direction of the positioning groove, and the valve positioning seat has A vertical adjustment plate installation plane located on the front side of the positioning slot, the left and right sides of the adjustment plate installation plane located in the front side of the positioning slot are each provided with a positioning screw hole, and the left and right sides of the front side of the positioning slot are also provided with a vertical Adjustment plate 7, the rear side of the adjustment plate 7 is attached to the installation plane of the adjustment plate, the opposite inner sides of the two adjustment plates 7 are vertical limit surfaces, and the corresponding positioning screw holes on the adjustment plate 7 are provided with horizontal elongated holes, Two positioning bolts 8 are also provided to pass through the corresponding elongated holes and positioning screw holes to fix the adjusting plate 7 .

In this way, when using, first loosen the positioning bolt, position the valve in the positioning slot and the valve disc extends out of the positioning slot, then move the adjusting plate in the left and right direction to make the limit surface contact the conical surface behind the valve disc, and then lock By tightening the positioning bolts to fix the adjusting plate, the axial limit of the valve can be realized conveniently and quickly. In this way, the limit is achieved by the contact between the adjusting plate and the conical surface behind the valve disc. Since the valve is generally produced, the conical surface is formed by the inner cavity of the lower die, and the end face of the valve disc is formed by punching, so the cone is formed by punching. The accuracy of the profile surface will be much higher than that of the valve disc end face. Therefore, the limit is achieved by the point contact between the limiting surface of the adjusting plate and the conical surface behind the valve disc, and then during the valve rotation process, the contact position between the limiting surface of the adjusting plate and the conical surface behind the valve disc is rotated to form a circular line, which can ensure The accuracy of the contact circle line reduces the error and better ensures that the detection result is the data reflecting the flatness of the valve disc end face.

Among them, two positioning rollers 9 are arranged along the front and rear directions in the positioning groove, the two positioning rollers 9 are arranged side by side along the width direction of the positioning groove, and a clamping groove for positioning the valve is formed between the upper surfaces of the two positioning rollers. The valve positioning seat on the side is provided with roller adjusting screw holes horizontally along the direction perpendicular to the positioning groove. Bolt 10.

In this way, the positioning of the valve is realized by means of two positioning rollers, the structure is simple, and the positioning is convenient, fast and reliable. The two roller adjusting bolts set at the same time can adjust the tightness between the two rollers, and then adjust the width of the clamping groove formed between the upper surfaces of the two positioning rollers, and then adjust the height of the positioning valve, so in the dial indicator When the height position is fixed, it is convenient to adjust the valve height position to ensure that the contact point between the dial indicator and the end face of the valve disc is the position suitable for the detection of the end face circle runout, which ensures the detection accuracy and has the advantages of convenient and quick adjustment.

Among them, the roller adjusting screw hole is set at the position of the axis line of the positioning roller 9 . In this way, it is more convenient for the positioning roller to contact and apply force when adjusting the tightness of the roller.

Wherein, the length of the positioning roller 9 is smaller than the length of the rod portion of the valve to be detected. In this way, when the valve is rotated during the detection process, the valve stem can be rotated by the part where the tail end of the valve rod extends out of the positioning roller and is suspended in the air, which is more convenient to rotate the valve and can better ensure that the positioning state of the valve remains unchanged during rotation, so as to improve the detection accuracy. .

Wherein, the edge of the front end surface of the positioning drum 9 is provided with a chamfer. In this way, the front end surface of the positioning roller and the tapered surface behind the valve disc of the valve to be tested can be prevented from interfering with each other and affecting the detection accuracy.

Among them, an adjustment plate centering adjustment structure is also provided, and the adjustment plate centering adjustment structure includes two adjustment nuts 11 correspondingly arranged in front of the two adjustment plates, and the screw holes of the adjustment nuts 11 are horizontally arranged along the width direction of the positioning groove, The adjusting nuts are respectively fixed on a nut seat 12, the adjusting plate corresponding to the nut seat 12 is provided with a nut fixing screw hole, the nut fixing screw hole is provided with a horizontal elongated hole, and a nut fixing bolt 13 is also provided to pass through. The nut seat 12 is fixed on the corresponding adjustment plate 7 through the elongated hole on the nut seat and the corresponding nut fixing screw hole; Two sections of external thread are screwed into two adjusting nuts respectively.

In this way, it is possible to rely on the adjustment plate centering adjustment structure for centering before testing, and adjust when testing different types of polished rods. Specifically, when aligning, first loosen the nut fixing bolts and the positioning bolts, and then determine the positions of the two positioning rollers, place a polished rod between the two positioning rollers for positioning, and then move the two adjusting plates to make the two positioning rollers. The relative limit surfaces of the adjustment plates are in contact with the polished rod, then rotate the positioning bolt to fix the adjustment plate, then rotate the nut fixing bolt to fix the nut seat, and remove the polished rod to achieve alignment. When testing valves of different sizes after centering, the two adjusting plates can be moved in the same direction or separated in opposite directions following the corresponding adjusting nuts by rotating the two-way screw, so as to adjust the two adjusting plates according to the valves of different sizes. The width distance between the plates makes it contact with the tapered position of the rear end of the valve disc of the valve to be inspected to realize inspection and ensure inspection accuracy. In this way, it is ensured that the two adjustment plates can be quickly adjusted under the condition that the two adjustment plates are kept centered, and the convenience and reliability of the adjustment in use are improved.

Wherein, one end of the bidirectional screw 14 is provided with a rotating knob 15 . This makes it easy to rotate and adjust.

A lead screw seat 16 is arranged in the middle of the bidirectional lead screw, the lead screw mount 16 is fixed on the base 1, a lead screw through hole is arranged horizontally through the lead screw seat 16, and the two-way lead screw 14 is rotatably matched with the lead screw through hole. inside the hole.

In this way, the height position of the lead screw is fixed by the lead screw seat, which makes the adjustment operation more convenient, and avoids the displacement of the adjustment plate caused by the adjustment of the lead screw and affects the subsequent detection accuracy.

Wherein, between the lead screw seat and the lead screw, an axial position limit structure of the lead screw is arranged to limit the axial displacement of the lead screw. In this way, the left and right positions of the lead screw can be better restricted, and the left and right displacement of the lead screw during adjustment can be avoided to drive the adjustment plate to move, thereby ensuring the symmetry and reliability of the adjustment. During implementation, the axial position limiting structure of the lead screw can be obtained by a concave-convex matching structure arranged in the circumferential direction between the inner wall of the through hole of the lead screw and the corresponding outer wall of the lead screw.

Claims (7)

1. a valve disc end face accuracy detection method, it is characterized in that, comprise the step of detecting the valve disc end face flatness, when detecting the valve disc end face flatness, the valve disc end face and a detection plane are fitted, and slide along the linear direction to pass through. A contact on the upper end of the dial indicator for flatness detection exposed on the detection plane, and the flatness of the end face of the valve disc is obtained by reading the maximum difference of the dial indicator for flatness detection; The step of detecting the flatness of the valve disc end face is realized by a valve disc end face flatness detection device. The valve disc end face flatness detection device includes a detection table, the upper surface of the detection table is a horizontal detection plane, and the detection plane is formed upward. A vertical first standard abutting surface, and a vertical second standard abutting surface, the second standard abutting surface and the first standard abutting surface are arranged vertically and the distance is smaller than the radius of the valve disc end face, on the detection plane There is also a detection hole, the distance between the detection hole and the first standard abutting surface is within the diameter of the end face of the valve disc, and the distance between the detection hole and the second standard abutting surface is greater than or equal to the diameter of the end face of the valve disc. A dial indicator for flatness detection, the detection rod of the dial indicator for flatness detection is set vertically upward, and the upper end contact of the detection rod of the dial indicator for flatness detection is exposed in the detection hole and the exposed height is greater than the end face of the valve disc Flatness tolerance range; when in use, fit the end face of the valve disc to be tested to the detection plane, and make one side of the valve disc fit with the first standard abutting surface, and move the valve disc in the direction of the second standard abutting surface ; It also includes the step of detecting the circular runout tolerance of the end face of the valve disc. The step of detecting the circular runout tolerance of the end face of the valve disc is realized by using a valve disc end face circular runout detection device. The valve disc end face circular runout detection device includes a base, and a valve is arranged on the base. A positioning mechanism and a valve disc end face circular runout detection mechanism; the valve positioning mechanism is used to realize the horizontal positioning of the valve to be detected and realize the unilateral limit of the positioned valve in the axial direction away from the direction of the valve disk. The disc end face circular runout detection mechanism includes a dial gauge mounting seat, on which is installed a dial gauge set horizontally and the dial gauge contact is facing the position of the detection point deviating from the center of the circle on the end face of the valve disc to be positioned. Setting, the dial gauge mounting seat is provided with a dial gauge adjustment mechanism for adjusting the fixed position of the dial gauge along the axial direction; In the valve disc end face circular runout detection device, the valve positioning mechanism includes a valve positioning seat, and the upper surface of the valve positioning seat is provided with a positioning groove running through the front and rear directions, and the positioning groove is used to realize the valve positioning along the length direction of the positioning groove. The valve positioning seat has a vertical adjustment plate installation plane located on the front side of the positioning groove. The left and right sides of the adjustment plate installation plane located in the front side of the positioning groove are each provided with a positioning screw hole. The left and right sides of the front side of the positioning groove Each is also provided with a vertical adjustment plate, the rear side of the adjustment plate is fitted with the installation plane of the adjustment plate, the opposite inner side of the two adjustment plates is a vertical limit surface, and the corresponding positioning screw holes on the adjustment plate are provided with horizontal lengths. The strip hole is also provided with two positioning bolts passing through the corresponding elongated hole and the positioning screw hole to fix the adjustment plate. 2. the valve disc end face precision detection method as claimed in claim 1 is characterized in that, the detection hole and the first standard abutting surface spacing are consistent at the valve disc end face circle radius, so that the diameter of the valve disc end face circle can be just when detected. The upper contact of the detection rod of the dial indicator for flatness detection in the direction can better improve the detection accuracy; A first standard block is arranged on the detection table, one side of the first standard block constitutes the first standard abutting surface, and a long strip-shaped first standard is arranged on the first standard block perpendicular to the first standard abutting surface. Block positioning holes, the first standard block positioning holes are fitted with first standard block fixing bolts that are downwardly inserted into the corresponding through holes on the detection table to realize the fixation of the first standard block. 3 . The method for detecting the end face accuracy of a valve disc according to claim 2 , wherein the positioning holes of the first standard block are two parallel and spaced. 4 . 4 . The method for detecting the accuracy of the valve disc end face according to claim 1 , wherein a second standard block is provided on the test table, and one side of the second standard block constitutes the second standard abutting surface, and the second standard The standard block is provided with an elongated second standard block positioning hole perpendicular to the second standard abutting surface, and the second standard block positioning hole is fitted with a second standard block that is inserted downward into the corresponding through hole on the testing table Fix the bolts and realize the fixing of the second standard block. 5. The valve disc end face accuracy detection method according to claim 1, characterized in that, the detection platform is provided with a dial indicator fixing block under the detection hole, and a dial indicator fixing block is vertically penetrated and provided with a facing detection block. The dial indicator assembly hole of the hole, the fixed part of the dial indicator for flatness detection and the dial is installed through the dial indicator assembly hole, and the dial indicator fixing block is located on the side of the dial indicator assembly hole. A fastening screw hole is also opened upward, and a fastening bolt is arranged in the fastening screw hole to realize the fixation of the dial indicator for flatness detection; The detection table includes a detection board arranged horizontally above, the upper surface of the detection board is the detection plane, two sides of the detection board are vertically arranged downwardly and vertically, and the lower end of the support board is fixed on a horizontally arranged bottom plate, and the flatness detection A dial indicator is located between the base plate and the test plate. 6. The valve disc end face accuracy detection method according to claim 1, wherein two positioning rollers are arranged in the positioning groove along the front-rear direction, the two positioning rollers are arranged side by side along the width direction of the positioning groove, and the two positioning rollers are arranged on the A clamping groove for positioning the valve is formed between the surfaces. The valve positioning seat on one side of the positioning groove is provided with a roller adjusting screw hole horizontally along the direction perpendicular to the positioning groove. For the positioning roller setting, the roller adjusting screw holes are screwed and matched with roller adjusting bolts. 7. The method for detecting the accuracy of the valve disc end face according to claim 6, characterized in that, an adjustment plate centering adjustment structure is further provided, and the adjustment plate centering adjustment structure comprises two correspondingly arranged in front of the two adjustment plates. Adjusting nut, the screw holes of the adjusting nut are arranged horizontally along the width direction of the positioning groove, the adjusting nuts are respectively fixed on a nut seat, the adjusting plate corresponding to the nut seat is provided with a nut fixing screw hole, and the nut fixing screw hole corresponding to the nut seat is provided with The horizontal elongated hole is also provided with a nut fixing bolt passing through the elongated hole on the nut seat and the corresponding nut fixing screw hole to realize the fixing of the nut seat on the corresponding adjustment plate; the adjustment plate centering adjustment structure also includes a bidirectional The two-way lead screw is symmetrically provided with two sections of external threads, which are respectively screwed into the two adjusting nuts.

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