A spherical radius gauge for eccentric rotating valve ball core detection

Abstract

The application discloses a spherical radius testing fixture for eccentric rotating valve ball core detection, which comprises a mounting seat, a fixing seat, a sliding shaft, a limiting spring and a micrometer gauge; the mounting seat is in a cylindrical shape, and an installation cavity is arranged on the mounting seat; the fixing seat is integrally formed on the outer side wall of the mounting seat, and two fixing seats are symmetrically arranged; the end portions of the two fixing seats away from the mounting seat are provided with angle blocks, the angle blocks are provided with abutting surfaces, and the abutting surfaces of the two angle blocks are the to-be-measured area; a guide sleeve is embedded in the installation cavity, and the guide sleeve is fixed with the mounting seat through fixing bolts; the sliding shaft and the limiting spring are coaxially arranged in the guide sleeve, and the end of the sliding shaft away from the to-be-measured area extends out of the guide sleeve; a shaft sleeve is arranged at the opening of the guide sleeve away from the to-be-measured area; the micrometer gauge comprises a main body and a measuring needle, the main body is fixed with the shaft sleeve, and the end of the measuring needle abuts against the end face of the sliding shaft away from the to-be-measured area; the application guarantees the accuracy and the repeated precision of detection, and the detection can be directly completed in a valve production and assembly workshop, so that the production and detection efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of inspection tool technology, and specifically relates to a spherical radius inspection tool for detecting the ball core of an eccentric rotary valve. Background Technology

[0002] Eccentric rotary valves are widely used in various industrial fields and public service scenarios, such as power, metallurgy, and municipal pipeline networks, due to their advantages of compact structure, high adjustment precision, good sealing performance, wear resistance, and corrosion resistance.

[0003] As the core moving component for valve opening, closing, and sealing regulation, the eccentrically rotating sector-shaped spherical core's outer wall radius accuracy and contour directly determine the surface pressure distribution and fit performance of the valve's sealing pair, thus affecting the valve's control accuracy, opening and closing stability, media cutoff reliability, and service life. Therefore, before assembling the eccentric rotary valve, it is necessary to inspect the outer wall spherical surface of the spherical core to verify whether it meets the design tolerance requirements. This is a preliminary quality control process to ensure the valve's finished product performance and mitigate operational risks.

[0004] As the nominal diameter of eccentric rotary valves increases, the dimensions and weight of their compatible ball cores also increase accordingly. This is especially true for large-diameter eccentric rotary valves with a nominal diameter DN≥250, where the ball cores are often heavy metal castings, with individual pieces weighing tens to hundreds of kilograms. On-site transport often requires handling equipment, resulting in high moving costs and potential damage to the ball core's sealing surface during transport. Therefore, large-diameter ball cores are commonly inspected on-site using portable small spherical radius gauges to avoid repeated transport and secondary damage.

[0005] Currently, the mainstream small spherical radius gauges on the market mainly consist of a base and a dial indicator. The base has two fixed support feet. The dial indicator includes a main body fixed to the base and a probe that can move radially. The probe and the two support feet form a three-point contact on the spherical surface, converting the radial displacement of the spherical surface into the dial indicator reading. Although the existing small spherical radius gauges have the advantages of simple structure, flexible transfer, and on-the-spot testing, they have the following disadvantages when used for testing large-size eccentric rotary valve ball cores: (1) The probe is prone to skew during the measurement process, resulting in the measurement accuracy failing to meet the design requirements of large-size eccentric rotary valve ball cores; (2) Large-size ball cores are mostly made using casting technology. After rough machining, their surface inevitably has defects such as pits, sand holes, and riser remnants. If the existing probe comes into contact with the above defects during measurement, it will cause the measured value to be too large or too small. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, the present invention provides a spherical radius gauge adapted for the detection of large-sized eccentric spherical cores.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is: a spherical radius gauge for detecting the ball core of an eccentric rotary valve, comprising a base and a dial indicator. The base includes a mounting cavity extending through both ends. The dial indicator includes a main body with a dial and a retractable probe. Angle blocks are provided at opposite ends of the base, each angle block having a contact surface. The included angle α between the contact surfaces of the two angle blocks satisfies 90° < α < 180°. The area between the contact surfaces of the two angle blocks is the area to be measured. A guide sleeve is coaxially embedded within the mounting cavity. A fixing bolt is installed on the seat to lock the guide sleeve and the mounting cavity coaxially; a sliding shaft and a limiting spring are coaxially arranged inside the guide sleeve, and the limiting spring applies an axial preload force to the sliding shaft toward the area to be measured. The end of the sliding shaft facing the area to be measured extends out of the guide sleeve; a bushing is coaxially embedded in the opening of the guide sleeve away from the area to be measured, and the bushing is fixed to the guide sleeve; the main body is located at the opening of the guide sleeve away from the area to be measured and is fixed to the bushing, and the probe is coaxially inserted into the bushing, and the end of the probe coaxially abuts against the end face of the sliding shaft away from the area to be measured.

[0008] Using the above method, before testing, the operator zeroed the dial indicator using a core sample block with the same specifications as the core to be tested.

[0009] During testing, the operator holds the testing tool and places the two angle blocks against the outer wall of the ball core to be tested, so that the ball core is located in the test area between the two angle blocks. At the same time, the sliding shaft is tightly fitted to the ball core under the action of pre-tightening force. The operator can directly read the value on the dial indicator to quickly determine whether the radius of the outer wall of the ball core to be tested is within the preset error range.

[0010] Compared with existing spherical radius detection equipment, this invention has the following advantages: First, by using the guide sleeve to guide the sliding shaft as the main guide and the bushing as the auxiliary guide, a double coaxial guide structure is formed, which can suppress radial movement during the axial sliding process of the sliding shaft and the probe, and ensure the accuracy and repeatability of displacement detection. Second, the limit spring provides a continuous and stable axial preload, ensuring that the detection end face of the slide shaft is always in close contact with the outer wall of the ball core to be tested, thus avoiding reading jumps due to poor contact during the testing process; Third, it adopts an integrated and miniaturized design, which is small in size and light in weight. It can be operated by a single person without moving large-sized ball core workpieces. Testing can be completed directly in the valve production and assembly workshop, shortening the testing process and improving production testing efficiency.

[0011] The angle blocks can be designed as an integral part of the fixed base to ensure long-term structural rigidity; or they can be fixed by bolts or other detachable means, which makes it easy to replace angle blocks of different specifications to expand the detection range. They can also be replaced individually after wear, reducing the cost of use.

[0012] As a further feature of the present invention, the end face of the sliding shaft facing the area to be measured includes an annular contact surface coaxially arranged with the sliding shaft, an outer transition surface disposed on the outer edge of the contact surface, and an inner transition surface disposed on the inner edge of the contact surface. The contact surface is an arc-shaped convex surface protruding towards the area to be measured. Along the axial section of the sliding shaft, the outlines of the outer transition surface, the inner transition surface, and the contact surface are located on the same virtual circle. An avoidance groove coaxially arranged with the sliding shaft is provided on the inner transition surface.

[0013] Using the above scheme, during testing, the annular contact surface forms an annular line contact with the spherical surface of the core to be tested. The annular line contact is not easily affected by local scratches or minor bumps on the spherical surface. The outer transition surface, inner transition surface and contact surface adopt a smooth design with equal curvature, which can avoid accidental contact between the edge corners and the spherical surface, ensuring the uniqueness of the measurement benchmark and the accuracy of the test results.

[0014] Meanwhile, large-size eccentric rotary valve ball cores are mostly produced using casting processes. The central area of ​​the ball surface is a concentrated area of ​​machining allowance after the riser is cut. During the rough machining stage, defects such as riser remnants may still remain on the ball surface. Existing inspection tips are prone to contact with these defects, leading to distorted inspection data. This invention eliminates the interference of defects on the inspection results by setting an avoidance groove to avoid the defect area. In addition, the contact stress during testing is evenly distributed along the entire annular contact line, with no local stress concentration points. After long-term high-frequency use, it is not prone to local wear and dents, resulting in a long service life and low frequency and cost of subsequent calibration and maintenance. It is suitable for the high-volume, high-frequency testing needs of valve production workshops.

[0015] As a further feature of the present invention, the clearance groove is a threaded groove, and a conical probe is detachably disposed in the clearance groove. The conical probe includes a mating part, a limiting part, and a tip part arranged coaxially. The mating part and the tip part are disposed on opposite sides of the limiting part. The outer wall of the mating part is provided with an external thread that mates with the threaded clearance groove. The diameter of the limiting part is larger than the inner diameter of the clearance groove. The tip part is conical, and the tip of the tip part away from the limiting part is an arc-shaped contact end.

[0016] By adopting the above scheme and installing a detachable cone-tip probe within the clearance groove, this inspection fixture can be adapted to the inspection needs of ball cores at different processing stages, improving its versatility and scenario adaptability: When inspecting ball cores in the rough machining stage, the sliding shaft with the clearance groove can be used directly to effectively avoid defects such as dents and riser remnants, completing a rapid initial inspection of the spherical radius; when inspecting finished ball cores in the finish machining stage, the cone-tip probe is coaxially screwed into the clearance groove, with the limiting part and the contact surface forming a limit, and the contact end forming a precise point contact with the ball surface to be tested. Compared to the annular line contact measurement which measures the arithmetic mean of all points in the contact ring, point contact has only a unique geometric contact point, and the measurement result is the absolute size value of that point. Moreover, it can inspect any position on the spherical surface point by point, effectively avoiding accuracy errors caused by local shape deviations, ensuring the accuracy of the inspection results, and accurately detecting the error between the ball core to be tested and a ball core sample of the same specification, completing a high-precision final inspection of the finished ball core.

[0017] The axial contact between the limiting part and the contact surface enables rapid coaxial positioning of the cone tip probe, avoiding the impact of installation deviation on detection accuracy. It is easy to disassemble and assemble, and the detection mode can be switched by quickly zeroing with a standard ball core sample block, without the need for complicated coaxiality calibration.

[0018] As a further feature of the present invention, along the radial direction of the slide shaft, the distance from the outer edge of the contact surface to the outer wall of the slide shaft is less than the distance from the inner edge of the contact surface to the inner wall of the clearance groove.

[0019] By adopting the above scheme, the relative positions of the contact surface, sliding shaft, and clearance groove can prevent the contact surface from being too close to the outer edge of the sliding shaft or the inner edge of the clearance groove, thus ensuring the stability and repeatability of measurement accuracy. At the same time, it facilitates the assembly of the mating parts into the threaded groove.

[0020] As a further feature of the present invention, the guide sleeve includes a near sliding cavity and a far sliding cavity that are interconnected. The near sliding cavity is located on the side of the far sliding cavity closer to the area to be measured. The inner diameter of the near sliding cavity is smaller than the inner diameter of the far sliding cavity, and an axial limiting step is formed between them. The sliding shaft includes a guide shaft located in the near sliding cavity and a mounting shaft located in the far sliding cavity. The diameter of the guide shaft is larger than the diameter of the mounting shaft. The guide shaft is slidably fitted with the near sliding cavity. The limiting spring is coaxially sleeved on the mounting shaft. The end of the guide shaft facing the mounting shaft is provided with a limiting ring that can form a limiting step with the axial limiting step. The end of the mounting shaft facing the guide shaft is provided with an annular fitting boss for the limiting spring to be fitted and fixed. The two ends of the limiting spring abut against the limiting ring and the bushing, respectively.

[0021] Using the above scheme, the guide sleeve adopts a stepped inner cavity design, which can realize the coaxial partition installation of the sliding shaft, the limiting spring, and the bushing. The positioning of each component is realized by the axial limiting step, reducing the assembly difficulty. The cooperation between the guide shaft and the inner wall of the near sliding cavity provides stable guidance for the axial sliding of the sliding shaft throughout the entire process. The cooperation between the limiting ring and the axial limiting step can limit the maximum stroke of the sliding shaft and prevent the sliding shaft from coming out of the guide sleeve. The limiting spring can provide a continuous and stable axial preload throughout the entire stroke of the slide shaft, ensuring smooth axial sliding of the slide shaft while always maintaining tight contact with the outer wall of the ball core under test. This avoids reading jumps caused by poor contact during the testing process and ensures the accuracy and stability of the invention over long-term use.

[0022] As a further feature of the present invention, the bushing includes three guide holes: a first guide hole, a second guide hole, and a third guide hole, which are sequentially interconnected and coaxially arranged in the direction approaching the area to be measured. The inner radial directions of the first guide hole, the second guide hole, and the third guide hole increase sequentially in the direction approaching the area to be measured. A step surface is formed between the first guide hole and the second guide hole, and a step surface is formed between the second guide hole and the third guide hole. The main body includes a rod end inserted into the first guide hole. The rod end is fixed to the bushing by a positioning bolt that passes radially through one side wall of the guide hole. The inner diameter of the first guide hole is larger than the diameter of the probe and smaller than the diameter of the mounting shaft. The probe is located in the second guide hole, and the inner diameter of the second guide hole is larger than the outer diameter of both the mounting shaft and the probe. The end of the limiting spring away from the area to be measured is located in the third guide hole and abuts against the step surface. The outer wall of the bushing is integrally formed with an abutment ring that forms a limiting position with the end face of the guide sleeve away from the area to be measured. The positioning bolt is located on the side of the abutment ring away from the area to be measured.

[0023] Using the above scheme, the bushing adopts a stepped inner cavity design to achieve coaxial partitioning of the dial indicator, probe, and limit spring, reducing assembly difficulty; at the same time, it cooperates with the stepped inner cavity of the guide sleeve to form a double guide structure, ensuring that the axial displacement of the slide shaft is accurately transmitted to the probe, thus ensuring measurement accuracy.

[0024] The stepped surface one provides a hard limit when the sliding shaft retracts excessively, preventing damage to the probe and providing protection. The inner diameter design of the guide hole two provides ample space for the axial sliding of the probe, allowing the mounting shaft to slide axially and resulting in a compact overall structure. The guide hole three provides stable installation and deformation space for the limit spring, ensuring continuous stability of the spring preload. The positioning bolts effectively prevent the dial indicator from loosening or shifting during testing, ensuring long-term stability of the measurement reference. The presence of the abutment ring enables rapid axial positioning of the bushing, eliminating the need for repeated adjustments to the bushing's assembly depth, significantly reducing assembly difficulty. It also restricts the axial movement of the bushing into the guide sleeve, ensuring long-term stability of the assembled structure.

[0025] As a further feature of the present invention, the base includes a mounting base and a fixing base fixed to the side wall of the mounting base. Two fixing bases are provided, and the two fixing bases are symmetrically arranged, with their symmetry planes coinciding with the axis of the mounting base. The end of the fixing base away from the mounting base is bent towards the area to be measured to form an assembly end. The assembly end is provided with a slot for the angle block to be partially inserted. The angle block and the corresponding fixing base are locked and fixed by fixing screws that pass through both the slot and the angle block.

[0026] Compared with direct mounting, the slot mounting design of the present invention improves the installation rigidity and anti-deflection capability of the angle blocks, avoids the angle blocks from deflecting or shifting during testing, and ensures the relative position accuracy and symmetry of the two angle blocks; the fixing screws are easy to install and remove, which facilitates the replacement and maintenance of the angle blocks.

[0027] As a further feature of the present invention, each of the slots is provided with three fixing screws, the center line of the three fixing screws forms a right-angled triangle, and the two right-angled sides of the right-angled triangle are respectively arranged along the radial and axial sides of the mounting base, with the radial right-angled side closer to the area to be measured and the axial right-angled side closer to the mounting base.

[0028] When the above method is used, the contact surface is subjected to radial and axial forces along the mounting base when it contacts the outer wall of the ball core under test. Long-term high-frequency use can easily lead to loosening of the fixing screws and displacement of the angle block, affecting the detection accuracy. The arrangement of the three fixing screws can form a stable triangular anti-loosening locking structure, which resists the radial and axial torques on the angle block from all directions, reducing the risk of screw loosening and angle block displacement after long-term high-frequency use, and reducing the frequency and cost of subsequent calibration and maintenance.

[0029] As a further feature of the present invention, the slot opening extends from the outer wall of the mounting end away from the mounting base to the outer wall of the mounting end facing and away from the area to be measured.

[0030] The above solution significantly reduces the processing difficulty of the slot by using a through-slot design with three openings, ensuring that the two fixed seats have the same shape, thereby ensuring the installation symmetry of the two angle blocks; at the same time, it facilitates the quick installation and removal of the angle blocks, improving the maintenance efficiency and scene adaptability of the inspection tool.

[0031] As a further feature of the present invention, the angle block is integrally formed with a limiting protrusion, the limiting protrusion and the slot of the slot facing the area to be measured form a limiting, and the abutment surface extends smoothly to the surface of the limiting protrusion facing away from the slot.

[0032] Using the above solution, the angle blocks can be quickly axially positioned without repeated adjustments to the installation position, ensuring that the installation positions of the two symmetrical angle blocks are consistent and avoiding assembly deviations; the contact surface extends to the limiting protrusion, which can prevent the limiting protrusion from interfering with the ball core to be tested.

[0033] The present invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0034] Appendix Figure 1 This is a front view of a specific embodiment of the present invention; Appendix Figure 2 For the appendix Figure 1 Enlarged view of part A; Appendix Figure 3 For the appendix Figure 1 Enlarged view of part B; Appendix Figure 4 Diagram showing the fit between the cone-tip probe and the sliding shaft; Appendix Figure 5 For the appendix Figure 1 Enlarged view of part C; Appendix Figure 6 This is a top view of a specific embodiment of the present invention.

[0035] Mounting base 1, mounting cavity 11, fixing bolt 12, fixing base 2, assembly end 21, slot 22, fixing screw 23, sliding shaft 3, contact surface 31, outer transition surface 32, inner transition surface 33, clearance groove 34, guide shaft 35, limiting ring 351, mounting shaft 36, sleeve boss 361, limiting spring 4, dial indicator 5, main body 51, rod end 511, probe 52, angle block 6, abutment surface 61, abutment surface one 611, abutment surface two 612, limiting protrusion 62, guide sleeve 7, near sliding cavity 71, far sliding cavity 72, axial limiting step 73, bushing 8, guide hole one 81, positioning bolt 811, guide hole two 82, guide hole three 83, step surface one 84, step surface two 85, abutment ring 86, cone tip probe 9, mating part 91, limiting part 92, tip part 93, contact end 931, ball core 10. Detailed Implementation

[0036] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] In the description of this invention, it should be noted that, unless otherwise specified, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, to facilitate a clear and intuitive demonstration of the structure of each component of this technical solution and the cooperation relationship between the components, the dimensions of some components have been adaptively adjusted by enlarging or reducing their proportions, and some prior art structures involved in the solution have been simplified; the dimensions and external structures shown in the accompanying drawings should not be directly construed as limitations on the actual size or shape of the product.

[0038] Specific embodiments of the present invention are shown in the accompanying drawings.

[0039] This embodiment discloses a spherical radius gauge for detecting the ball core of an eccentric rotary valve. It is mainly used for rapid on-site detection of the outer wall of the ball core of a large-size eccentric rotary valve. It can be adapted to the high-volume, high-frequency detection scenarios in valve production and assembly workshops, and solves the problem that existing spherical radius detection methods are not compatible with the detection needs of large-size ball cores.

[0040] This embodiment includes a mounting base 1, a fixing base 2, a sliding shaft 3, a limiting spring 4, and a dial indicator 5.

[0041] Mounting base 1 is cylindrical and has a mounting cavity 11 that is coaxial with the mounting base 1 and extends through both ends. Fixing base 2 is plate-shaped and integrally formed on the outer wall of mounting base 1. Two fixing bases 2 are provided, symmetrically arranged, with their plane of symmetry coinciding with the axis of mounting base 1. This arrangement ensures the symmetry and stability of the fixture. Angle blocks 6 are provided at the ends of both fixing bases 2 furthest from mounting base 1. Angle blocks 6 have abutment surfaces 61 for positioning against the outer wall of the ball core 10 to be tested. The included angle α between the abutment surfaces 61 of the two angle blocks 6 satisfies 90° < α < 180°. The area between the abutment surfaces 61 of the two angle blocks 6 is the testing area for placing the ball core 10.

[0042] A guide sleeve 7 is coaxially embedded in the mounting cavity 11. A fixing bolt 12 is provided on the mounting base 1 to lock the guide sleeve 7 and the mounting base 1 together. The sliding shaft 3 and the limiting spring 4 are both coaxially arranged in the guide sleeve 7. The limiting spring 4 applies an axial preload to the sliding shaft 3 toward the area to be measured. The end of the sliding shaft 3 facing the area to be measured extends out of the guide sleeve 7. A bushing 8 is coaxially embedded in the opening of the guide sleeve 7 away from the area to be measured. The bushing 8 is fixed to the guide sleeve 7. The dial indicator 5 includes a main body 51 with a dial and a retractable probe 52. The main body 51 is located at the opening of the guide sleeve 7 away from the area to be measured and is fixed to the bushing 8. The probe 52 is coaxially inserted into the bushing 8, and the end of the probe 52 coaxially abuts against the end face of the sliding shaft 3 away from the area to be measured. This embodiment uses a mechanical dial indicator. This type of dial indicator 5 has high detection accuracy, strong anti-interference ability, requires no battery, has low purchase and full-cycle maintenance costs, and is suitable for complex industrial environments.

[0043] The guide sleeve 7 plays a leading guiding role for the sliding shaft 3, and the bushing 8 plays an auxiliary guiding role. The two work together to form a double coaxial guiding structure, which can eliminate radial movement during the axial sliding process of the sliding shaft 3 and the probe 52, and ensure the accuracy and repeatability of displacement detection. At the same time, the limiting spring 4 provides a continuous and stable axial preload, ensuring that the detection end face of the sliding shaft 3 is always in close contact with the outer wall of the ball core 10 to be tested. Furthermore, the end face of the slide shaft 3 facing the area to be measured includes an annular contact surface 31 coaxially arranged with the slide shaft 3, an outer transition surface 32 disposed on the outer edge of the contact surface 31, and an inner transition surface 33 disposed on the inner edge of the contact surface 31. The contact surface 31 is an arc-shaped convex surface protruding towards the area to be measured. Along the axial section of the slide shaft 3, the outlines of the outer transition surface 32, the inner transition surface 33, and the contact surface 31 are located on the same virtual circle. An avoidance groove 34 coaxially arranged with the slide shaft 3 is provided on the inner transition surface 33.

[0044] During testing, the annular contact surface 31 forms an annular line contact with the spherical surface of the ball core 10 under test. This annular line contact is less susceptible to interference from local scratches or minor bumps on the spherical surface. The outer transition surface 32, inner transition surface 33, and contact surface 31 are designed with equal curvature and smoothness to avoid accidental contact between the edges and corners and the spherical surface, ensuring the uniqueness of the measurement benchmark and the accuracy of the test results. Meanwhile, the ball core 10 of large-size eccentric rotary valves is mostly produced using casting technology. The central area of ​​the spherical surface is a concentrated area of ​​machining allowance after the riser is cut. During the rough machining stage, defects such as riser remnants may still remain. Existing testing tips are prone to contact with these defects, leading to distorted test data. This embodiment avoids these defects by setting an avoidance groove 34, eliminating the interference of defects on the test results. Furthermore, the contact stress during testing is evenly distributed along the entire annular contact line, with no local stress concentration points. This makes it less prone to local wear and indentation after long-term high-frequency use, resulting in a long service life and low frequency and cost of subsequent calibration and maintenance, making it suitable for the large-volume, high-frequency testing needs of valve production workshops.

[0045] Furthermore, the clearance groove 34 is a threaded groove, and a conical probe 9 is detachably installed inside the clearance groove 34. The conical probe 9 includes a coaxially arranged mating part 91, a limiting part 92, and a tip part 93. The mating part 91 and the tip part 93 are respectively located on opposite sides of the limiting part 92. The outer wall of the mating part 91 is provided with an external thread that is threadedly engaged with the clearance groove 34. The diameter of the limiting part 92 is larger than the inner diameter of the clearance groove 34. The tip part 93 is conical, and the tip of the tip part 93 away from the limiting part 92 is an arc-shaped contact end 931.

[0046] Preferably, along the radial direction of the slide shaft 3, the distance from the outer edge of the contact surface 31 to the outer wall of the slide shaft 3 is less than the distance from the inner edge of the contact surface 31 to the inner wall of the clearance groove 34. The relative positions of the contact surface 31, the slide shaft 3, and the clearance groove 34 can prevent the contact surface 31 from being too close to the outer edge of the slide shaft 3 or the inner edge of the clearance groove 34, prevent contact deformation and contact line offset caused by edge effects, and ensure the stability and repeatability of measurement accuracy; at the same time, it facilitates the insertion of the mating part 91 into the clearance groove 34.

[0047] The detachable cone-tip probe 9 design allows this embodiment to adapt to the inspection needs of different processing stages of the ball core 10, improving the versatility and scenario adaptability of the inspection tool: when inspecting the ball core 10 in the rough machining stage, the sliding shaft 3 with the clearance groove 34 can be used directly to effectively avoid defects such as dents and riser remnants, and complete the rapid initial inspection of the spherical radius; when inspecting the finished ball core 10 in the finish machining stage, the cone-tip probe 9 is coaxially screwed into the clearance groove 34, and the limiting part 92 and the contact surface 31 form a limit, and the contact end 931 forms a precise point contact with the ball surface to be tested. Compared with the annular line contact, which measures the arithmetic mean of all points of the contact ring, the point contact has only a unique geometric contact point, and the measurement result is the absolute size value of that point. Moreover, it can inspect any position on the spherical surface point by point, which can effectively avoid the accuracy error caused by local shape deviation, ensure the accuracy of the inspection result, and accurately detect the error between the ball core 10 to be tested and the ball core 10 sample with the same specifications, and complete the high-precision final inspection of the finished ball core 10. Meanwhile, the axial contact limit between the limiting part 92 and the contact surface 31 enables rapid coaxial positioning of the cone tip probe 9, avoiding the impact of installation deviation on detection accuracy. It is easy to disassemble and assemble, and the detection mode can be switched by quickly zeroing the standard ball core 10 sample block without the need for complicated coaxiality calibration.

[0048] Furthermore, the guide sleeve 7 includes a near sliding cavity 71 and a far sliding cavity 72 that are interconnected. The near sliding cavity 71 is located on the side of the far sliding cavity 72 that is closer to the area to be measured. The inner diameter of the near sliding cavity 71 is smaller than the inner diameter of the far sliding cavity 72, and an axial limiting step 73 is formed between the two. Correspondingly, the sliding shaft 3 includes a guide shaft 35 located in the near sliding cavity 71 and a mounting shaft 36 located in the far sliding cavity 72. The diameter of the guide shaft 35 is larger than the diameter of the mounting shaft 36. The guide shaft 35 slides and fits coaxially with the near sliding cavity 71. The limiting spring 4 is coaxially sleeved on the mounting shaft 36. The end of the guide shaft 35 facing the mounting shaft 36 is provided with a limiting ring 351 that can form a limiting with the axial limiting step 73. The end of the mounting shaft 36 facing the guide shaft 35 is provided with an annular fitting boss 361 for the limiting spring 4 to be sleeved and fixed. The two ends of the limiting spring 4 abut against the limiting ring 351 and the bushing 8, respectively.

[0049] The guide sleeve 7 adopts a stepped inner cavity design, which can realize the coaxial partition installation of the sliding shaft 3, the limiting spring 4, and the bushing 8. The axial limiting step 73 enables the rapid positioning of each component and reduces the assembly difficulty. The cooperation between the guide shaft 35 and the inner wall of the near sliding cavity 71 provides stable guidance for the axial sliding of the sliding shaft 3 throughout the entire process. The cooperation between the limiting ring 351 and the axial limiting step 73 can limit the maximum stroke of the sliding shaft 3 and prevent the sliding shaft 3 from coming out of the guide sleeve 7. At the same time, the limiting spring 4 can provide a continuous and stable axial preload throughout the entire stroke of the sliding shaft 3, ensuring that the sliding shaft 3 slides smoothly in the axial direction while always being in close contact with the outer wall of the ball core 10 under test, avoiding reading jumps caused by poor contact during the test, and ensuring the accuracy and stability of this embodiment in long-term use.

[0050] Furthermore, the bushing 8 includes a guide hole 1 81, a guide hole 2 82, and a guide hole 3 83 that are sequentially interconnected and coaxially arranged in the direction of approaching the area to be measured. The inner radial directions of the guide holes 1 81, 2 82, and 3 83 increase sequentially in the direction of approaching the area to be measured. A step surface 1 84 is formed between the guide holes 1 81 and 2 82, and a step surface 2 85 is formed between the guide holes 2 82 and 3 83. The main body 51 includes a rod end 511 inserted into a guide hole 1 81. The rod end 511 is fixed to the bushing 8 by a positioning bolt 811 that passes radially through the bushing 8 on the side wall of the guide hole 1 81. The inner diameter of the guide hole 1 81 is larger than the diameter of the probe 52 and smaller than the diameter of the mounting shaft 36. The probe 52 is located in the guide hole 2 82. The inner diameter of the guide hole 2 82 is larger than the outer diameter of both the mounting shaft 36 and the probe 52. The end of the limiting spring 4 away from the area to be measured is located in the guide hole 3 83 and abuts against the step surface 2 85. In addition, the outer wall of the bushing 8 is integrally formed with an abutment ring 86 that forms a limit with the end face of the guide sleeve 7 away from the area to be measured. The positioning bolt 811 is located on the side of the abutment ring 86 away from the area to be measured.

[0051] The bushing 8 adopts a stepped inner cavity design to achieve coaxial partitioned installation of the dial indicator 5, the probe 52, and the limit spring 4, reducing assembly difficulty; at the same time, it cooperates with the stepped inner cavity of the guide sleeve 7 to form a double guide structure, ensuring that the axial displacement of the sliding shaft 3 is accurately transmitted to the probe 52, thus ensuring measurement accuracy.

[0052] Among them, the stepped surface 84 can form a hard limit when the sliding shaft 3 retracts excessively, preventing damage to the probe 52 and playing a protective role; the inner diameter design of the guide hole 82 provides sufficient space for the axial sliding of the probe 52, and at the same time, the guide hole 82 allows the mounting shaft 36 to slide axially, making the overall structure compact; the guide hole 83 provides stable installation and deformation space for the limit spring 4, ensuring the continuous stability of the spring preload. The positioning bolt 811 can effectively prevent the dial indicator 5 from loosening or shifting during the testing process, ensuring the long-term stability of the measurement reference. The presence of the abutment ring 86 can realize the rapid axial positioning of the bushing 8 without repeatedly adjusting the assembly depth of the bushing 8, greatly reducing the assembly difficulty, and at the same time, it can limit the axial movement of the bushing 8 into the guide sleeve 7, ensuring the long-term stability of the structure after assembly.

[0053] Furthermore, the end of the fixing base 2 away from the mounting base 1 is bent towards the area to be tested to form an assembly end 21. The assembly end 21 is provided with a slot 22 for the angle block 6 to be partially embedded. The angle block 6 and the corresponding fixing base 2 are locked and fixed by fixing screws 23 that pass through both the slot 22 and the angle block 6. Compared with direct mounting, the slot 22 embedding design in this embodiment improves the installation rigidity and anti-deflection capability of the angle block 6, avoids the angle block 6 from deflecting or shifting during testing, and ensures the relative positional accuracy and symmetry of the two angle blocks 6; the fixing screws 23 are easy to install and remove, facilitating the replacement and maintenance of the angle block 6.

[0054] In this embodiment, each slot 22 is fitted with three fixing screws 23. The center line connecting the three fixing screws 23 forms a right-angled triangle, with the two right-angled sides of the triangle arranged radially and axially along the mounting base 1, respectively. The radial right-angled side is closer to the area to be tested, and the axial right-angled side is closer to the mounting base 1. When the contact surface 61 abuts against the outer wall of the ball core 10 to be tested, it will be subjected to radial and axial forces along the mounting base 1. Long-term high-frequency use can easily cause the fixing screws 23 to loosen and the angle block 6 to shift, affecting the detection accuracy. The arrangement of the three fixing screws 23 can form a stable triangular anti-loosening locking structure, resisting the radial and axial torques on the angle block 6 from all directions, reducing the risk of screw loosening and angle block 6 shifting after long-term high-frequency use, and reducing the frequency and cost of subsequent calibration and maintenance.

[0055] Furthermore, the slot 22 extends from the outer wall of the mounting end 21 away from the mounting base 1 to the outer wall of the mounting end 21 facing and away from the area to be tested. The through slot design with three openings greatly reduces the processing difficulty of the slot 22, ensures that the two fixed bases 2 have the same shape, and thus ensures the installation symmetry of the two angle blocks 6; at the same time, it facilitates the quick installation and removal of the angle blocks 6, improving the maintenance efficiency and scene adaptability of the inspection tool.

[0056] Furthermore, the angle block 6 is integrally formed with a limiting protrusion 62. The limiting protrusion 62 and the slot 22 facing the area to be measured form a limiting position, and the abutment surface 61 extends smoothly to the surface of the limiting protrusion 62 facing away from the slot 22. The limiting protrusion 62 can achieve rapid axial positioning of the angle block 6, ensuring that the installation positions of the two symmetrical angle blocks 6 are consistent without repeated adjustments to the installation position, thus avoiding assembly deviations. The abutment surface 61 extends to the limiting protrusion 62 to prevent interference between the limiting protrusion 62 and the ball core 10 to be measured.

[0057] In this embodiment, the contact surface 61 includes a first contact surface 611 and a second contact surface 612. The first contact surface 611 is located on the side of the second contact surface 612 away from the limiting protrusion 62. The second contact surface 612 and the surface of the limiting protrusion 62 facing away from the slot 22 are smoothly transitioned, and the included angles of the first contact surface 611 and the second contact surface 612 with respect to the symmetrical planes of the two fixed seats 2 are set in a gradient. The included angle between the first contact surfaces 611 of the two angle blocks 6 is 90°, and the included angle between the second contact surfaces 612 of the two angle blocks 6 is 100°. This gradient contact surface 61 structure design allows a single set of angle blocks 6 to adapt to the detection requirements of ball cores 10 in different specification ranges, expands the detection range without frequent replacement of angle blocks 6, and further improves the ease of operation and scene adaptability of the inspection tool.

[0058] The usage procedure of this embodiment is as follows: Before testing, the operator selects the corresponding embodiment based on the specifications of the ball core 10 to be tested. The operator then uses a ball core 10 sample block with the same specifications as the ball core 10 to be tested to perform zero calibration on the dial indicator 5 (this process is the conventional calibration process of existing dial indicators, and will not be elaborated in this embodiment).

[0059] During testing, the operator holds the inspection tool and places the two angle blocks 6 against the outer wall of the ball core 10 to be tested, so that the ball core 10 is located in the test area between the two angle blocks 6. At the same time, the sliding shaft 3 or the tip 93 is tightly fitted to the ball core 10 under the action of pre-tightening force. The operator can directly read the dial value of the dial indicator 5 to quickly determine whether the radius of the outer wall of the ball core 10 to be tested is within the preset error range.

[0060] Compared with existing spherical radius detection equipment, this embodiment has the following advantages: First, it adopts an integrated and miniaturized design, which is small in size and light in weight. It can be operated by a single person without moving the large-sized ball core 10 workpiece. The inspection can be completed directly in the valve production and assembly workshop, shortening the inspection process and improving production inspection efficiency. Secondly, the double coaxial guiding structure formed by the guide sleeve 7 and the bushing 8, combined with the stable radial sliding fit throughout the entire process, can effectively suppress the radial movement of the sliding shaft 3 and the probe 52 during the axial sliding process. Combined with the continuous and stable spring preload, it ensures the accuracy, stability and repeatability of the detection. Third, the design of the annular line contact structure and the avoidance groove 34 can effectively avoid the interference of local defects on the spherical surface and the concentrated area of ​​machining allowance on the test results, while reducing the wear rate of long-term use and extending the service life of the inspection tool. Fourth, the design of the detachable cone tip probe 9 and the replaceable angle block 6 can be adapted to the inspection of ball cores 10 of various specifications. At the same time, it can adapt to the inspection needs of ball cores 10 of different processing stages and different sizes, which greatly improves the versatility and scenario adaptability of the inspection tool, while reducing the cost of later maintenance and replacement. Fifth, the design of the angle block 6 with slot 22 and triangular anti-loosening locking structure can effectively avoid the problem of the angle block 6 becoming loose or shifting after long-term high-frequency use, ensuring the long-term stability of the detection benchmark and further reducing calibration and maintenance costs.

[0061] This invention is not limited to the specific embodiments described above. Those skilled in the art can implement this invention using various other specific embodiments based on the content disclosed herein. Any simple changes or modifications made to the design structure and concept of this invention fall within the protection scope of this invention.

Claims

1. A spherical radius gauge for eccentric rotating valve ball core detection, comprising a base and a dial gauge, the base comprising a through mounting cavity at both ends, the dial gauge comprising a main body with a dial and a retractable probe, characterized in that: Angle blocks are provided at both opposite ends of the base, and each angle block has an abutment surface. The included angle α between the abutment surfaces of the two angle blocks satisfies 90° < α < 180°. The area between the abutment surfaces of the two angle blocks is the area to be measured. A guide sleeve is coaxially embedded in the mounting cavity, and a fixing bolt is passed through the base to lock the guide sleeve and the mounting cavity coaxially. A sliding shaft and a limiting spring are coaxially arranged inside the guide sleeve. The limiting spring applies an axial preload force to the sliding shaft toward the area to be measured. The end of the sliding shaft facing the area to be measured extends out of the guide sleeve. A bushing is coaxially embedded at the opening of the guide sleeve away from the area to be measured, and the bushing is fixed to the guide sleeve. The main body is located at the opening of the guide sleeve away from the area to be measured and is fixed to the bushing. The probe is coaxially inserted into the bushing, and the end of the probe coaxially abuts against the end face of the sliding shaft away from the area to be measured.

2. The spherical radius gauge for detecting the ball core of an eccentric rotary valve according to claim 1, characterized in that: The end face of the sliding shaft facing the area to be measured includes an annular contact surface coaxially arranged with the sliding shaft, an outer transition surface disposed on the outer edge of the contact surface, and an inner transition surface disposed on the inner edge of the contact surface. The contact surface is an arc-shaped convex surface protruding towards the area to be measured. Along the axial section of the sliding shaft, the outlines of the outer transition surface, the inner transition surface, and the contact surface are located on the same virtual circle. An avoidance groove coaxially arranged with the sliding shaft is provided on the inner transition surface.

3. A spherical radius gauge for detecting the ball core of an eccentric rotary valve according to claim 2, characterized in that: The clearance groove is a threaded groove, and a conical probe is detachably installed in the clearance groove. The conical probe includes a coaxially arranged mating part, a limiting part, and a tip part. The mating part and the tip part are located on opposite sides of the limiting part. The outer wall of the mating part is provided with an external thread that mates with the threaded clearance groove. The diameter of the limiting part is larger than the inner diameter of the clearance groove. The tip part is conical, and the tip of the tip part away from the limiting part is an arc-shaped contact end.

4. A spherical radius gauge for detecting the ball core of an eccentric rotary valve according to claim 3, characterized in that: Along the radial direction of the slide shaft, the distance from the outer edge of the contact surface to the outer wall of the slide shaft is less than the distance from the inner edge of the contact surface to the inner wall of the clearance groove.

5. A spherical radius gauge for detecting the ball core of an eccentric rotary valve according to claim 2, 3, or 4, characterized in that: The guide sleeve includes a near sliding cavity and a far sliding cavity that are interconnected. The near sliding cavity is located on the side of the far sliding cavity closer to the area to be measured. The inner diameter of the near sliding cavity is smaller than that of the far sliding cavity, and an axial limiting step is formed between them. The sliding shaft includes a guide shaft located in the near sliding cavity and a mounting shaft located in the far sliding cavity. The diameter of the guide shaft is larger than that of the mounting shaft. The guide shaft is slidably fitted with the near sliding cavity. The limiting spring is coaxially sleeved on the mounting shaft. The end of the guide shaft facing the mounting shaft is provided with a limiting ring that can form a limiting step with the axial limiting step. The end of the mounting shaft facing the guide shaft is provided with an annular fitting boss for the limiting spring to be fitted and fixed. The two ends of the limiting spring abut against the limiting ring and the shaft sleeve, respectively.

6. A spherical radius gauge for detecting the ball core of an eccentric rotary valve according to claim 5, characterized in that: The bushing includes three guide holes: a first guide hole, a second guide hole, and a third guide hole, which are sequentially interconnected and coaxially arranged towards the area to be measured. The inner radial directions of the three guide holes increase sequentially towards the area to be measured. A step surface is formed between the first and second guide holes, and a step surface is formed between the second and third guide holes. The main body includes a rod end inserted into the first guide hole. The rod end is fixed to the bushing by a positioning bolt that passes radially through one side wall of the guide hole. The inner diameter of the first guide hole is larger than the probe diameter but smaller than the mounting shaft diameter. The probe is located in the second guide hole, and the inner diameter of the second guide hole is larger than both the mounting shaft and the probe's outer diameter. The end of the limiting spring away from the area to be measured is located in the third guide hole and abuts against the second step surface. The outer wall of the bushing is integrally formed with an abutment ring that forms a limiting position with the end face of the guide sleeve away from the area to be measured. The positioning bolt is located on the side of the abutment ring away from the area to be measured.

7. A spherical radius gauge for detecting the ball core of an eccentric rotary valve according to claim 4 or 6, characterized in that: The base includes a mounting base and a fixing base fixed to the side wall of the mounting base. There are two fixing bases, which are symmetrically arranged and their plane of symmetry coincides with the axis of the mounting base. The end of the fixing base away from the mounting base is bent towards the area to be measured to form an assembly end. The assembly end is provided with a slot for the angle block to be partially inserted. The angle block and the corresponding fixing base are locked and fixed by fixing screws that pass through both the slot and the angle block.

8. A spherical radius gauge for detecting the ball core of an eccentric rotary valve according to claim 7, characterized in that: Each slot is fitted with three fixing screws, and the center line of the three fixing screws forms a right-angled triangle. The two right-angled sides of the right-angled triangle are respectively arranged along the radial and axial sides of the mounting base, with the radial right-angled side closer to the area to be measured and the axial right-angled side closer to the mounting base.

9. A spherical radius gauge for detecting the ball core of an eccentric rotary valve according to claim 8, characterized in that: The slot opening extends from the outer wall of the mounting end away from the mounting base to the outer wall of the mounting end facing and away from the area to be tested.

10. A spherical radius gauge for detecting the ball core of an eccentric rotary valve according to claim 8 or 9, characterized in that: The angle block is integrally formed with a limiting protrusion. The limiting protrusion and the slot facing the area to be measured form a limiting position. The abutting surface extends smoothly to the surface of the limiting protrusion facing away from the slot.

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