Valve seat groove symmetry comprehensive testing fixture

Abstract

The utility model discloses a valve seat groove symmetry comprehensive testing fixture, including drive rotating component, drive rotating component includes annular plate and annular shell, the annular shell sets up at the top of annular plate, the bottom of annular shell is through annular plate and extends to outside, the inner wall of annular plate and be located the surface of annular shell through bearing and annular shell rotation connection. In the utility model positioning detection subassembly, servo motor drives fixed axle rotation through first bevel gear and second bevel gear to push the synchronous extension of moving block and positioning ball, until reach the valve seat groove inner wall, cooperate pressure sensor real -time monitoring contact pressure, and after the pressure reaches the standard, automatically stop telescoping, the center of forced positioning ball is aligned with the valve seat groove theoretical center, through telescoping adjustment and modularization design, cover the vast majority of annular valve seat groove specifications, need not frequently replace parts.

Description

Technical Field

[0001] This utility model relates to the field of inspection tool technology, and in particular to a comprehensive inspection tool for valve seat groove symmetry. Background Technology

[0002] In the manufacturing of valve components, such as ball valves, gate valves, and globe valves, the valve seat groove serves as the core reference structure for valve seat installation. Its symmetry relative to the valve body reference axis directly determines the valve's sealing performance and service life. When the symmetry of the valve seat groove exceeds the tolerance, the valve seat will experience unilateral contact or eccentric offset after installation, resulting in uneven contact between the valve core and the valve seat sealing surface, and the medium leakage will exceed 0.1 mL / min. In severe cases, this can lead to valve failure.

[0003] For example, Chinese patent announcement number CN214792942U discloses a gauge for detecting the symmetry of a valve seat groove, including a valve seat plate. The front and rear sides of the valve seat plate are symmetrically arranged to facilitate the detection of the symmetry of the inner contour of the valve seat groove. The valve seat plate is provided with a left-right extending axis of symmetry L. The valve seat plate is provided with a first vertical hole, a second vertical hole and a third vertical hole respectively centered on the axis of symmetry L. The first vertical hole is equipped with a valve seat groove vent hole detection pin extending downward, the second vertical hole is equipped with a valve seat groove rivet hole detection pin extending downward, and the third vertical hole is equipped with an upward extending handle.

[0004] The above case uses manual inspection to detect symmetry, which requires visual observation and affects the inspection results. In addition, it cannot achieve 360° full-circumference symmetry scanning and is not applicable to valve seat grooves of different sizes, thus reducing its applicability. Therefore, we provide a comprehensive valve seat groove symmetry inspection tool. Utility Model Content

[0005] The purpose of this invention is to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a comprehensive valve seat groove symmetry inspection tool, which can automatically achieve 360° full-circumference symmetry scanning.

[0006] A valve seat groove symmetry inspection tool according to an embodiment of the present invention includes: A drive rotation assembly includes an annular plate and an annular shell. The annular shell is disposed on the top of the annular plate, and the bottom of the annular shell penetrates the annular plate and extends to the outside. The inner wall of the annular plate and the surface of the annular shell are rotatably connected to the annular shell via bearings. A positioning detection component includes a mounting block, a forward-rotating threaded rod, and a reverse-rotating threaded rod. The mounting block is installed on the inner wall of an annular shell, and a servo motor is installed at the bottom of the mounting block. The output end of the servo motor is connected to the forward-rotating threaded rod and the reverse-rotating threaded rod and drives the forward-rotating threaded rod and the reverse-rotating threaded rod to rotate. A clamping and fixing assembly, the clamping and fixing assembly including fixing blocks, the number of fixing blocks being two and respectively installed on the left and right sides of the bottom of the annular plate.

[0007] According to some embodiments of the present invention, an annular connecting shell is installed on the top of the annular plate and on the surface of the annular shell, and a rotary motor is installed on the top of the annular connecting shell.

[0008] According to some embodiments of the present invention, the bottom end of the output shaft of the rotary motor passes through the annular connecting shell and extends into it to install a drive gear. A driven gear that meshes with the drive gear is installed on the surface of the annular shell at a position corresponding to the drive gear.

[0009] According to some embodiments of the present invention, the forward-rotating threaded rod is rotatably connected to the bearing in the left groove of the inner wall of the annular shell, and the reverse-rotating threaded rod is rotatably connected to the bearing in the right groove of the inner wall of the annular shell. The right end of the forward-rotating threaded rod and the left end of the reverse-rotating threaded rod are fixedly connected by a fixed shaft.

[0010] According to some embodiments of the present invention, a first bevel gear is installed at the bottom end of the servo motor output shaft, and a second bevel gear that meshes with the first bevel gear is installed on the surface of the fixed shaft at a position corresponding to the first bevel gear.

[0011] According to some embodiments of this utility model, the surfaces of the forward-rotating threaded rod and the reverse-rotating threaded rod are both threaded with threaded blocks, and pressure sensors are installed on the bottom of the two threaded blocks on the side away from each other. A moving block is installed on the side of the pressure sensor away from the threaded block.

[0012] According to some embodiments of the present invention, a positioning ball is installed on the side of the moving block away from the threaded block that penetrates the annular shell and extends to its outside. Laser displacement sensors are installed on the bottom of both the front and back sides of the annular shell.

[0013] According to some embodiments of the present invention, electric push rods are installed on the sides of the two fixed blocks that are far apart from each other, and the output end of the electric push rod passes through the fixed block and extends to the outside of it to install an arc-shaped clamping block.

[0014] The present invention has the following beneficial effects: 1. In the positioning and detection component of this utility model, the servo motor drives the fixed shaft to rotate through the first and second bevel gears, thereby pushing the moving block and the positioning ball to extend synchronously until they abut against the inner wall of the valve seat groove. The pressure sensor monitors the contact pressure in real time. Once the pressure reaches the target, the extension and retraction automatically stop, forcing the center of the positioning ball to align with the theoretical center of the valve seat groove. In the drive rotation component, the rotary motor drives the annular shell to rotate through the drive gear and the driven gear. The rotation center is the center of the positioning ball. The rotation concentricity is ≤0.002mm, avoiding the scanning trajectory distortion caused by the rotational eccentricity of traditional gauges, improving the accuracy of the inner wall contour data collected by the laser displacement sensor. Through telescopic adjustment and modular design, it covers most annular valve seat groove specifications, eliminating the need for frequent component replacement.

[0015] 2. By setting up a clamping and fixing component, this utility model ensures that after the annular plate and annular shell are fixed to the center position of the valve seat groove, there will be no shaking phenomenon in the later stage, thus ensuring the stability of the annular plate and annular shell during operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model; Figure 2 This is a bottom-view perspective view of the three-dimensional structure of an embodiment of the present invention; Figure 3 This is a three-dimensional structural cross-sectional view of an embodiment of the present utility model; Figure 4 This is a three-dimensional cross-sectional view of the positioning detection component according to an embodiment of the present utility model; Figure 5 This is a top view of the three-dimensional structure of an embodiment of the present utility model; Figure 6 This is a structural cross-sectional view of the valve seat groove detection state from the front view of an embodiment of this utility model.

[0018] The attached diagram lists the components represented by each number as follows: In the diagram: 1. Drive rotation assembly; 11. Annular plate; 12. Annular shell; 13. Annular connecting shell; 14. Rotary motor; 15. Drive gear; 16. Driven gear; 2. Positioning detection assembly; 21. Mounting block; 22. Forward rotating threaded rod; 23. Reverse rotating threaded rod; 24. Servo motor; 200. Fixed shaft; 25. First bevel gear; 26. Second bevel gear; 27. Threaded block; 28. Pressure sensor; 29. ​​Moving block; 210. Positioning ball; 211. Laser displacement sensor; 3. Clamping and fixing assembly; 31. Fixing block; 32. Electric push rod; 33. Arc-shaped clamping block. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0023] Please see Figure 1-6As shown, this utility model is a comprehensive gauge for valve seat groove symmetry, including a drive rotation assembly 1. The drive rotation assembly 1 includes an annular plate 11 and an annular shell 12. The annular shell 12 is disposed on the top of the annular plate 11. The annular plate 11 is made of Q235 steel plate, which improves its strength during use. A controller is installed on the left side of the top of the annular plate 11. The controller is equipped with a display screen. The controller is electrically connected to a rotary motor 14, a servo motor 24, a pressure sensor 28, a laser displacement sensor 211, and an electric push rod 32. Signal devices are installed on both the left and right sides of the bottom of the annular plate 11. The transmitter and battery provide electrical power. The bottom of the annular shell 12 extends through the annular plate 11 and outwards. The inner wall of the annular plate 11, located on the surface of the annular shell 12, is rotatably connected to the annular shell 12 via bearings. A driven gear 16 is mounted on the surface of the annular shell 12, receiving power from the rotary motor 14 and driving the internal detection components to rotate. The bottom of the annular shell 12 extends through the annular plate 11, allowing the positioning ball 210 and the laser displacement sensor 211 to extend into the valve seat groove. It is made of aluminum alloy. An annular connecting shell 13 is mounted on the top of the annular plate 11, located on the surface of the annular shell 12. There is no contact between the surface of the housing 12 and the annular connecting housing 13, so it will not affect the rotation of the annular housing 12. The annular connecting housing 13 provides a mounting carrier for the rotary motor 14, protects the internal drive gear 15 and driven gear 16, and prevents dust and iron filings from entering and affecting the meshing accuracy. The rotary motor 14 is mounted on the top of the annular connecting housing 13. The rotary motor 14 serves as a rotational power source, and its output shaft drives the drive gear 15 to rotate, indirectly driving the annular housing 12 and the internal detection components to rotate, achieving 360° full-circumference scanning. A hollow cup motor model 38H is selected, with controllable speed. With a speed of 0 r / min, adaptable to different testing requirements, the bottom end of the output shaft of the rotary motor 14 passes through the annular connecting shell 13 and extends into it to install a drive gear 15. The drive gear 15 is fixedly connected to the output end of the rotary motor 14 by welding. On the surface of the annular shell 12 and at the position corresponding to the drive gear 15, a driven gear 16 is installed that meshes with the drive gear 15. The driven gear 16 is fixedly connected to the annular shell 12 by welding. The drive gear 15 is fixed to the bottom end of the output shaft of the rotary motor 14 and meshes with the driven gear 16 to transmit the rotational power of the motor to the annular shell 12.

[0024] The positioning detection component 2 includes a mounting block 21, a forward-rotating threaded rod 22, and a reverse-rotating threaded rod 23. The mounting block 21 is installed on the inner wall of the annular shell 12, providing a mounting reference for the servo motor 24 and ensuring precise meshing between the motor and the bevel gear of the fixed shaft 200. The servo motor 24 is mounted at the bottom of the mounting block 21. The output shaft of the servo motor 24 drives the first bevel gear 25 to rotate, indirectly driving the forward-rotating threaded rod 22 and the reverse-rotating threaded rod 23 to rotate, controlling the extension and retraction of the positioning ball 210 for centering. It can precisely control the rotation amount of the threaded rod, thereby controlling the extension and retraction distance of the positioning ball 210. The self-locking function prevents the threaded rod from rotating in the opposite direction after centering, avoiding loosening of the positioning ball 210. The servo motor 24 is equipped with a self-locking function. The forward and reverse rotating motor has a forward-rotating threaded rod 22 rotatably connected to a bearing in the left groove of the inner wall of the annular shell 12. The inner ring of the bearing is fixedly connected to the surface of the forward-rotating threaded rod 22, and the outer ring of the bearing is fixedly connected to the groove of the inner wall of the annular shell 12. The reverse rotating threaded rod 23 is rotatably connected to a bearing in the right groove of the inner wall of the annular shell 12. The inner ring of the bearing is fixedly connected to the surface of the reverse rotating threaded rod 23, and the outer ring of the bearing is fixedly connected to the groove of the inner wall of the annular shell 12. The right end of the forward rotating threaded rod 22 and the left end of the reverse rotating threaded rod 23 are fixedly connected by a fixed shaft 200. When rotating, the left threaded block 27 moves radially, and the thread direction is right-handed, which is different from the left-handed thread of the reverse rotating threaded rod 23. The threaded blocks 27 on both sides move synchronously in opposite directions when the motor rotates, ensuring the symmetrical centering of the positioning ball 210. The reverse threaded rod 23 is coaxial with the forward threaded rod 22, and when rotating, it drives the right threaded block 27 to move radially. The thread profile is trapezoidal, with strong load-bearing capacity. The threaded rod is made of No. 45 steel to avoid thread deformation during centering. A first bevel gear 25 is installed at the bottom of the output shaft of the servo motor 24. A second bevel gear 26 is installed on the surface of the fixed shaft 200 at the position corresponding to the first bevel gear 25, meshing with the first bevel gear 25. The meshing of the first bevel gear 25 and the second bevel gear 26 changes the direction of power transmission. The bevel gear is made of 20CrMnTi material, and the gear ratio with the second bevel gear 26 is 1: 1. Power transmission without deceleration or acceleration ensures precise correspondence between the rotation of the threaded rod and the rotation of the motor, thereby controlling positioning accuracy. Both the forward-rotating threaded rod 22 and the reverse-rotating threaded rod 23 have threaded blocks 27 threadedly connected to their surfaces. The bottom of the threaded block 27 slides in contact with the bottom of the inner wall of the annular shell 12, serving as a guide for the threaded block 27. This allows the rotational force of the threaded rod to be converted into lateral movement of the threaded block 27. The threaded block 27 drives the pressure sensor 28 and the moving block 29 to move radially. Pressure sensors 28 are installed on the bottom of the two threaded blocks 27 on opposite sides. The pressure sensors 28 detect the contact pressure between the positioning ball 210 and the inner wall of the valve seat groove and feed the signal back to the controller. Miniature pressure sensors 28 are selected.When the pressure reaches the preset value of 5-10N, a signal is automatically sent to the controller to stop the servo motor 24, preventing the centering mechanism from loosening due to insufficient pressure or the valve seat groove wall from being damaged by excessive pressure. A moving block 29 is installed on the side of the pressure sensor 28 away from the threaded block 27. The moving block 29 transmits the moving force of the threaded block 27, causing the positioning ball 210 to extend and retract. The positioning ball 210 is installed on the side of the moving block 29 away from the threaded block 27 that penetrates through the annular shell 12 and extends to its outside. The surface of the moving block 29 and the surface of the moving block 29 penetrating the annular shell 12 are connected. The locating ball 210 extends out of the annular shell 12 and contacts the inner wall of the valve seat groove. Synchronous extension and retraction on both sides aligns the center of the gauge with the theoretical center of the valve seat groove. Made of silicon carbide ceramic, it makes point contact with the inner wall of the valve seat groove, adapting to slight unevenness. Laser displacement sensors 211 are installed on the bottom of both the front and back sides of the annular shell 12. As the annular shell 12 rotates, the laser displacement sensors 211 non-contactly scan the contour of the inner wall of the valve seat groove, collecting angular and radial distance data. Infrared laser sensors are used.

[0025] The clamping and fixing assembly 3 includes two fixing blocks 31, which are respectively installed on the left and right sides of the bottom of the annular plate 11. The fixing blocks 31 are fixedly connected to the annular plate 11 by welding, providing an installation reference for the electric push rod 32 and bearing the thrust of the push rod. The electric push rod 32 is installed on the side of the two fixing blocks 31 that is far apart from each other. The output shaft of the electric push rod 32 pushes the arc-shaped clamping block 33 to move towards the valve body, thereby clamping and fixing the valve body. The thrust can be set by the controller. The output end of the electric push rod 32 passes through the fixing block 31 and extends to its outside, where the arc-shaped clamping block 33 is installed. The arc-shaped clamping block 33 is used to fix the valve body on the surface of the valve seat groove, and fixes the valve body by clamping force to prevent the valve body from shifting when the detection rotates. The arc-shaped clamping block 33 is made of soft polyurethane.

[0026] When in use, place the annular valve seat groove to be tested at the testing station below the annular plate 11, with the open end of the valve seat groove facing upwards and aligned with the protruding area at the bottom of the annular shell 12, ensuring that the positioning ball 210 can be inserted into the groove. Pressing the centering start button on the controller starts the servo motor 24, whose output shaft drives the first bevel gear 25 to rotate. The first bevel gear 25 meshes with the second bevel gear 26 on the surface of the fixed shaft 200, causing the fixed shaft 200 and the forward and reverse threaded rods 22 and 23 at both ends to rotate synchronously at a speed of 10 r / min. The rotation of the forward and reverse threaded rods 22 and 23 causes the threaded blocks 27 on the surface to move synchronously in opposite directions, pushing the moving block 29 and the positioning ball 210 at the end to extend out of the annular shell 12 and gradually approach the inner wall of the valve seat groove. When the positioning ball 210 contacts the inner wall of the valve seat groove, the pressure sensor 28 collects the contact pressure in real time and transmits it. When the pressure reaches the preset value, the controller immediately stops the servo motor 24 and activates the self-locking function of the servo motor 24. At this time, the center of the positioning ball 210 is aligned with the theoretical center of the valve seat groove, completing the benchmark unification between the gauge and the valve seat groove. When one of the positioning balls 210 contacts the inner wall of the valve seat groove first, the force will drive the annular shell 12 and the annular plate 11 to move laterally, so that the annular plate 11 moves laterally at the top of the valve seat groove until both positioning balls 210 are in contact with the inner wall of the valve seat groove. After the pressure sensor 28 senses the unified pressure value, the servo motor 24 can be stopped. At this time, the positions of the annular plate 11 and the annular shell 12 are concentric with the valve seat groove. Press the clamping start button on the controller, and the controller sends a signal to the electric push rod 32. The output shaft of the electric push rod 32 extends synchronously, pushing the arc-shaped clamp 33 closer to the outer wall of the valve body until the arc-shaped clamp 33 is in contact with the outer wall of the valve body. Pressing the controller's scan start button activates the rotary motor 14 on top of the annular connecting shell 13, which operates at a speed of 5 r / min, matching the sampling frequency of the laser displacement sensor 211. Its output shaft drives the drive gear 15 to rotate, which meshes with the driven gear 16 on the surface of the annular shell 12. This causes the annular shell 12 and its internal positioning detection components to rotate around the center of the valve seat groove. The bearings between the annular shell 12 and the annular plate 11 ensure concentricity of rotation, preventing scan trajectory deviation. As the annular shell 12 rotates, the laser displacement sensors on its front and back bottom... The device 211 starts synchronously and scans the inner wall contour of the valve seat groove in a non-contact manner. The sensor collects 3 data points for every 1° of rotation and records the rotation angle and radial distance data in real time. For example, when the angle is 0°, the distance from the left groove wall to the sensor is 14.998 mm and the distance from the right groove wall is 15.002 mm. The data is transmitted to the external terminal through the signal transmitter. After one rotation, the rotating motor 14 stops automatically. The scanning process takes 12 seconds. At 5 r / min, 1 revolution = 12 seconds. A total of 1080 data points are collected to ensure that the entire circumference contour of the valve seat groove is covered. The controller's built-in algorithm processes the data collected by the laser sensor. For each rotation angle θ, it extracts the distance between the left and right groove walls at its symmetrical angle θ+180°. The deviation for each symmetrical angle is calculated using a formula. For example, when θ=0°, the deviation is |14.998-15.002| / 2=0.002mm. The maximum value of all deviations is taken as the final symmetry of the valve seat groove. The controller's display screen shows the detection results in real time. If the final symmetry is ≤0.02mm, it is displayed as qualified; if it is greater than the difference, it is displayed as unqualified.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A valve seat groove symmetry comprehensive testing tool, characterized in that, include: A drive rotation assembly (1) includes an annular plate (11) and an annular shell (12). The annular shell (12) is disposed on the top of the annular plate (11). The bottom of the annular shell (12) passes through the annular plate (11) and extends to the outside. The inner wall of the annular plate (11) and the surface of the annular shell (12) are rotatably connected to the annular shell (12) by bearings. The positioning detection component (2) includes a mounting block (21), a forward-rotating threaded rod (22), and a reverse-rotating threaded rod (23). The mounting block (21) is mounted on the inner wall of the annular shell (12). A servo motor (24) is mounted on the bottom of the mounting block (21). The output end of the servo motor (24) is connected to the forward-rotating threaded rod (22) and the reverse-rotating threaded rod (23) and drives the forward-rotating threaded rod (22) and the reverse-rotating threaded rod (23) to rotate. The clamping and fixing assembly (3) includes two fixing blocks (31) installed on the left and right sides of the bottom of the annular plate (11).

2. The valve seat groove symmetry comprehensive inspection tool according to claim 1, characterized in that: An annular connecting shell (13) is mounted on the top of the annular plate (11) and on the surface of the annular shell (12), and a rotary motor (14) is mounted on the top of the annular connecting shell (13).

3. The valve seat groove symmetry comprehensive inspection tool according to claim 2, characterized in that: The bottom end of the output shaft of the rotary motor (14) passes through the annular connecting shell (13) and extends into it to install a drive gear (15). A driven gear (16) that meshes with the drive gear (15) is installed on the surface of the annular shell (12) at a position corresponding to the drive gear (15).

4. The valve seat groove symmetry comprehensive inspection tool of claim 1, wherein: The forward-rotating threaded rod (22) is rotatably connected to the bearing in the left groove of the inner wall of the annular shell (12), and the reverse-rotating threaded rod (23) is rotatably connected to the bearing in the right groove of the inner wall of the annular shell (12). The right end of the forward-rotating threaded rod (22) and the left end of the reverse-rotating threaded rod (23) are fixedly connected by a fixed shaft (200).

5. The valve seat groove symmetry comprehensive inspection tool of claim 4, wherein: The bottom end of the output shaft of the servo motor (24) is equipped with a first bevel gear (25), and a second bevel gear (26) that meshes with the first bevel gear (25) is installed on the surface of the fixed shaft (200) at a position corresponding to the first bevel gear (25).

6. The valve seat groove symmetry comprehensive inspection tool of claim 4, wherein: Both the forward-rotating threaded rod (22) and the reverse-rotating threaded rod (23) are threaded with threaded blocks (27). Pressure sensors (28) are installed on the bottom of the two threaded blocks (27) on the side away from each other. A moving block (29) is installed on the side of the pressure sensor (28) away from the threaded block (27).

7. The valve seat groove symmetry comprehensive inspection tool of claim 6, wherein: The movable block (29) extends through the annular shell (12) and outwards from the threaded block (27) on one side, and a positioning ball (210) is installed thereon. Laser displacement sensors (211) are installed on the bottom of both the front and back sides of the annular shell (12).

8. The valve seat groove symmetry comprehensive inspection tool of claim 1, wherein: Electric push rods (32) are installed on the sides of the two fixed blocks (31) that are far apart from each other. The output end of the electric push rod (32) passes through the fixed block (31) and extends to the outside of it to install an arc-shaped clamping block (33).

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