Fixture for fluorescent flaw detection of disc-shaped parts

Abstract

The utility model provides a clamp for fluorescent flaw detection of disc-shaped parts, which comprises a triangular pyramid frame, three clamp heads and a hanging ring, the three clamp heads are arranged on the edges and respectively correspond to the conical surface of the frame, and the plate surface of the disc-shaped parts is parallel to the conical surface of the frame after the disc-shaped parts are installed. Each clamp head comprises a bottom plate, three shaft sleeve assemblies, a sliding assembly and a baffle, two shaft sleeve assemblies are perpendicularly fixed to the bottom plate, and the other shaft sleeve assembly is perpendicular to the bottom plate, installed on the sliding assembly located on the bottom plate and capable of sliding along a long through hole in the bottom plate under driving of the sliding assembly. The three shaft sleeve assemblies are sleeved with the disc-shaped parts, the disc-shaped parts can rotate around the axes of the disc-shaped parts, and the baffles are connected with mandrels of the shaft sleeve assemblies so as to prevent the disc-shaped parts from falling off from the sleeve assemblies. According to the fixture disclosed by the utility model, the disc-shaped part can be reliably immersed into fluorescent liquid without being overturned and adjusted again, and the whole process of fluorescent flaw detection of the part can be completed by only stirring the part to rotate and visually inspecting the conditions of each surface during inspection, so that the whole process of fluorescent flaw detection of the part can be completed by one-time clamping.

Description

TECHNICAL FIELD

[0001] The utility model belongs to fluorescent flaw detection technical field, concretely relates to a disc -shaped part fluorescent flaw detection clamp. BACKGROUND

[0002] In the maintenance of aviation turbine engine and gas turbine, it is often necessary to carry out fluorescent penetrant testing on some disc-shaped parts to check whether the parts have cracks, inclusions and other defects. The disc-shaped parts are mostly flat annular, and the inner edge and the outer edge have axial thickening protruding structures, and the rotary interface is a flat H type, and some disc-shaped parts are equipped with blades during the testing process. When the conventional immersion method is used for fluorescent penetrant testing, a frame is usually used to hoist the disc-shaped part to be detected for penetration detection, but this scheme has the following disadvantages: 1. To ensure that the fluorescent liquid penetrates the surface of the disc-shaped part by 100%, the disc surface is placed horizontally and lowered vertically, but during sinking into the fluorescent liquid, air will accumulate under the disc surface, so the disc surface needs to be turned over or tilted to expel the air, and when the fluorescent liquid is lifted out, the disc surface needs to be tilted again to pour the fluorescent liquid remaining on the surface of the part clean, which requires repeatedly turning over the disc body multiple times in the whole process, increasing the labor intensity of the operator; 2. During hoisting, the disc body is fixed at the bottom, which is easy to slide and collide with the hoisting frame, posing a safety risk and possibly damaging the disc body; 3. Only one disc-shaped part can be tested at a time, causing waste of space; 4. This method is only suitable for pre-cleaning, drying, penetration, cleaning or drying processes, and has a small range of application, and the disc-shaped part needs to be removed for inspection of each surface of the disc-shaped part during the later fluorescent inspection, increasing the additional work. SUMMARY

[0003] The utility model aims at overcoming the deficiencies of the existing disc-shaped part fluorescent penetrant testing method, which is complicated to operate and has a small range of application, and provides a disc-shaped part fluorescent flaw detection clamp.

[0004] To achieve the above-mentioned purpose, the technical solution provided by the utility model is:

[0005] The disc-shaped part has a central through hole, the inner wall of the central through hole has a plurality of spline teeth at both ends, and the central through hole has an annular boss extending outward along the axial direction on one end face.

[0006] For the fluorescent flaw detection of the above-mentioned disc-shaped part, the utility model provides a disc-shaped part fluorescent flaw detection clamp, which comprises a triangular pyramid frame, a clamp head and a lifting ring arranged at the top of the triangular pyramid frame; the lifting ring is used to connect with the lifting equipment to lift the fluorescent flaw detection clamp and the disc-shaped part.

[0007] The single clamp head comprises a base plate, a baffle, a sliding assembly and three shaft sleeve assemblies vertically arranged around the circumference of the base plate; the three shaft sleeve assemblies have the same structure and are used to support the inner wall of the disc-shaped part and enable the disc-shaped part to rotate around its axis; the three shaft sleeve assemblies comprise a first shaft sleeve assembly, a second shaft sleeve assembly and a third shaft sleeve assembly; the first shaft sleeve assembly and the second shaft sleeve assembly are fixedly connected with the top surface of the base plate.

[0008] The sliding assembly is mounted on the base plate and is perpendicular to the plane in which the first shaft sleeve assembly and the second shaft sleeve assembly are located.

[0009] The base plate has an elongated through hole, and the length direction of the elongated through hole is along the direction perpendicular to the plane in which the first shaft sleeve assembly and the second shaft sleeve assembly are located.

[0010] The lower end of the third shaft sleeve assembly is fixedly connected with the sliding assembly; the third shaft sleeve assembly can slide along the elongated through hole under the driving of the sliding assembly.

[0011] The three clamp heads are uniformly arranged around the lateral edges of the triangular pyramid frame and are located in the same horizontal plane; and the base plate of the clamp head is parallel to the conical surface on which the clamp head is installed.

[0012] The baffle is mounted on the top of the three shaft sleeve assemblies to prevent the disc-shaped part installed on the shaft sleeve assembly from being separated from the shaft sleeve assembly.

[0013] Further, the shaft sleeve assembly comprises a multi-stage shaft sleeve and a mandrel coaxially mounted in the multi-stage shaft sleeve; the outer wall of the mandrel has external threads matched with the inner wall of the multi-stage shaft sleeve, and the two ends of the mandrel protrude out of the inner hole of the multi-stage shaft sleeve; the mandrel in the first shaft sleeve assembly and the second shaft sleeve assembly is threadedly connected with the base plate; the lower end of the mandrel in the third shaft sleeve assembly is threadedly connected with the sliding assembly.

[0014] Further, the sliding assembly comprises a sliding block, a pull rod and a spring; the base plate has a columnar through hole coaxially communicated with the elongated through hole; the rod body of the pull rod passes through the columnar through hole and the elongated through hole in sequence; the spring is sleeved on the pull rod, and the two ends of the spring are limited between the inner end surface of the columnar through hole and the mandrel of the third shaft sleeve assembly.

[0015] The lower end of the mandrel of the third shaft sleeve assembly is fixedly connected with the pull rod and the sliding block in sequence, and the sliding block is arranged along the axial direction of the pull rod; the third shaft sleeve assembly and the sliding block can slide under the action force of the spring or the pull rod.

[0016] Further, two guide grooves are formed on both sides of the bottom of the long hole and along the axial direction of the pull rod, the surface of the sliding block is attached to the surface of the guide groove, and the sliding block can slide along the guide groove.

[0017] Further, a positioning pin is further included; the bottom plate and the pull rod have coaxially formed pin holes for installing the positioning pin to fix the position of the third shaft sleeve assembly.

[0018] Further, the bottom plate is an isosceles triangular plate, and the sliding assembly is arranged on the bottom plate along the symmetry line of the bottom plate.

[0019] Further, three anti-collision arc rods are further included to prevent the edge gear of the disc-shaped part from being injured during hoisting and moving; the anti-collision arc rods are fixed and supported on the three-prism pyramid frame through a plurality of connecting rods.

[0020] The anti-collision arc rods are coplanar with the disc-shaped part installed on the clamp head, and the diameter of the anti-collision arc rod is smaller than the diameter of the disc-shaped part.

[0021] Further, the baffle is Y-shaped, the three ends of the baffle are provided with screw holes matched with the mandrels, the three ends of the baffle are respectively threadedly connected with the mandrels of the shaft sleeve assembly, and the baffle is fixed through bolts.

[0022] Further, the three lateral edges of the three-prism pyramid frame are respectively provided with a fixing block parallel to the conical surface of the three-prism pyramid frame; and the bottom plate of the shaft sleeve assembly is attached and fixed on the surface of the fixing block.

[0023] Further, the multi-stage shaft sleeve comprises a screw sleeve and a first circular annular protrusion, a second circular annular protrusion and a third circular annular protrusion coaxially arranged on the outer wall of the screw sleeve from top to bottom.

[0024] The space formed between the first circular annular protrusion and the second circular annular protrusion and between the second circular annular protrusion and the third circular annular protrusion is used for giving space to the spline teeth at both ends of the inner wall of the central through hole of the disc-shaped part.

[0025] The side wall of the second circular annular protrusion can be in contact with the inner wall surface of the central through hole of the disc-shaped part; the upper end surface of the third circular annular protrusion is provided with a conical annular protrusion at the joint with the rod body of the screw sleeve; and the conical annular protrusion can be in contact with the inner side of the end surface of the annular boss of the disc-shaped part to axially support the disc-shaped part.

[0026] The utility model discloses the advantages are:

[0027] 1. The disc-shaped part fluorescent flaw detection clamp provided by the utility model discloses a three-pyramid frame and clamp heads installed on the edges of the three-pyramid frame, the clamp heads are perpendicular to the corresponding conical surfaces and are matched with the three-pyramid frame, the disc-shaped parts are prevented from shielding each other, the surfaces of the disc-shaped parts parallel to the conical surfaces can be observed, the disc-shaped parts can be fully soaked or sprayed and cleaned by the fluorescent liquid, the operator can directly visually observe when checking, only needs to rotate the disc-shaped parts around the axis of the disc-shaped parts, the disc-shaped parts do not need to be reinstalled, time and labor are saved; the disc-shaped parts can be clamped once to complete the whole process of the fluorescent flaw detection (including pretreatment, drying, penetration, penetration agent removal, drying, phenomenon, observation and post-treatment).

[0028] 2. The three-pyramid frame can make the disc-shaped parts be in an inclined state after installation, air chambers are avoided from being formed by the lower surfaces of the disc-shaped parts when the disc-shaped parts are soaked in the fluorescent liquid, and the disc-shaped parts can be lifted and separated from the fluorescent liquid tank, the fluorescent liquid drops are promoted, the residual fluorescent liquid on the disc-shaped parts is reduced, waste is reduced, and cost is saved.

[0029] 3. The three shaft sleeve assemblies made of soft materials are designed in the utility model, the disc-shaped parts are sleeved on the three shaft sleeve assemblies, the disc-shaped parts are radially supported by the outer walls of the multi-stage shaft sleeves in the shaft sleeve assemblies, and the disc-shaped parts can rotate around the axis of the disc-shaped parts; the baffle is designed in the utility model, the disc-shaped parts are axially fixed by the baffle, and shaking is avoided; the anti-collision arc rod is designed in the utility model, and the disc-shaped parts are prevented from being knocked in the lifting and running process.

[0030] 4. The three clamp heads are provided in the utility model, the fluorescent flaw detection operation of three disc-shaped parts can be simultaneously realized, and the working efficiency is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a three disc-shaped part layout schematic diagram in the utility model embodiment;

[0032] Figure 2 It is an axial side view of the disc-shaped part fluorescent flaw detection clamp of the utility model;

[0033] Figure 3 It is a downward view of the disc-shaped part fluorescent flaw detection clamp of the utility model;

[0034] Figure 4 It is a front view of the disc-shaped part fluorescent flaw detection clamp of the utility model;

[0035] Figure 5 It is an isometric side view of the clamp head in the disc-shaped part fluorescent flaw detection clamp of the utility model;

[0036] Figure 6Is the rear view of the clamp head in the disc-shaped part fluorescent flaw detection clamp of the utility model;

[0037] Figure 7 Is the right view of the disc-shaped part cooperating with the clamp of the utility model in the embodiment;

[0038] Figure 8 Is the downward view of the disc-shaped part cooperating with the clamp of the utility model in the embodiment;

[0039] Figure 9 Is the front view of the disc-shaped part cooperating with the clamp of the utility model in the embodiment;

[0040] In the figure: 1-triangular pyramid frame, 2-clamp head, 3-lifting ring, 4-bottom plate, 401-elongated through hole, 402-guide groove, 403-pin hole, 5-baffle, 6-sliding assembly, 7-first shaft sleeve assembly, 8-second shaft sleeve assembly, 9-third shaft sleeve assembly, 10-pull rod, 11-spring, 12-sliding block, 13-multistage shaft sleeve, 1301-screw sleeve, 1302-first circular annular protrusion, 1303-second circular annular protrusion, 1304-third circular annular protrusion, 1305-tapered ring protrusion, 14-spindle, 15-anti-collision arc rod, 16-disc-shaped part, 1601-center through hole, 1602-annular boss, 17-positioning pin. DETAILED DESCRIPTION

[0041] The embodiment of the utility model is described in detail below, which is exemplary and aims at explaining the utility model and cannot be understood as the limitation of the utility model.

[0042] Referring to Figure 1 In order to reliably immerse the disc-shaped part in the fluorescent solution during the disc-shaped part fluorescent flaw detection process, and intuitively observe the condition of each surface of the disc-shaped part during the inspection, the utility model provides a disc-shaped part fluorescent flaw detection clamp, so that three disc-shaped parts installed thereon are uniformly and staggered arranged around the circumference, improving the space utilization. The disc-shaped part 16 has a center through hole 1601, the inner wall of the center through hole 1601 has a plurality of spline teeth at both ends, and the center through hole has an annular boss 1602 extending outward along the axial direction on one end surface.

[0043] Referring to Figures 2-4In order to achieve the above-mentioned disc-shaped part fluorescent flaw detection, the embodiment provides a disc-shaped part fluorescent flaw detection clamp according to the diameter, thickness and size of the fluorescent penetration tank of the disc-shaped part. The disc-shaped part fluorescent flaw detection clamp comprises a triangular pyramid frame 1, a clamp head 2 and a lifting ring 3 arranged at the top of the triangular pyramid frame 1. The lifting ring 3 is used to be connected with hoisting equipment to simultaneously lift the disc-shaped part and the disc-shaped part fluorescent flaw detection clamp installed on the disc-shaped part fluorescent flaw detection clamp and immerse them in the fluorescent penetration tank. The single clamp head 2 comprises a bottom plate 4, a baffle 5, a sliding assembly 6 and three shaft sleeve assemblies vertically arranged around the circumference of the bottom plate 4. The three shaft sleeve assemblies have the same structure and are used to support the inner wall of the disc-shaped part and enable the disc-shaped part 16 to rotate around its own axis. The bottom plate is an isosceles triangular plate. The three shaft sleeve assemblies comprise a first shaft sleeve assembly 7, a second shaft sleeve assembly 8 and a third shaft sleeve assembly 9. The first shaft sleeve assembly 7 and the second shaft sleeve assembly 8 are symmetrically fixed on the bottom plate relative to the symmetric axis of the bottom plate. The bottom plate has an elongated through hole 401, and the length direction of the elongated through hole is along the direction perpendicular to the plane where the first shaft sleeve assembly and the second shaft sleeve assembly are located. The sliding assembly 6 is installed on the bottom plate and is perpendicular to the plane where the first shaft sleeve assembly and the second shaft sleeve assembly are located. The lower end of the third shaft sleeve assembly 9 is vertically fixed to the sliding assembly, and the third shaft sleeve assembly 9 can slide along the elongated through hole under the drive of the sliding assembly. The three clamp heads 2 are uniformly arranged on the lateral edges of the triangular pyramid frame and are located on the same horizontal plane. The bottom plates of the clamp heads are parallel to the conical surface where the installation position is located.

[0044] Specifically, a fixing block (not shown in the figure) is welded on each of the three lateral edges of the triangular pyramid frame 1, and the fixing blocks are parallel to the three conical surfaces of the triangular pyramid frame, respectively. The bottom plates of the three shaft sleeve assemblies are fixed on the surfaces of the corresponding fixing blocks by welding. The inclined arrangement of the triangular pyramid frame 1 and the staggered arrangement of the clamp heads on the triangular pyramid frame ensure that the disc-shaped parts installed on the three conical surfaces do not block each other, and ensure that all surfaces of the three disc-shaped parts installed simultaneously can be fully immersed in the fluorescent liquid or fully observed during inspection.

[0045] Three anti-collision arc rods 15 are fixed and supported on the triangular pyramid frame by a plurality of connecting rods and are located close to the installation positions of the three clamp heads, respectively. The anti-collision arc rods are coplanar with the disc-shaped parts installed on the clamp heads, and the diameters of the anti-collision arc rods are greater than the diameters of the disc-shaped parts. The anti-collision arc rods are made of stainless steel rods and are used to protect the gear teeth on the edges of the disc-shaped parts during lifting and moving.

[0046] Reference Figure 5 and Figure 6The bottom plate 4 has a columnar through hole along the symmetry axis of the bottom plate, which is communicated with the elongated through hole 401. Two guide grooves 402 are formed on both sides of the bottom of the elongated through hole along the symmetry axis of the bottom plate, which are used for guiding and sliding the sliding assembly. A pin hole 403 is formed on the symmetry axis of the bottom plate and close to the positions of the first and second shaft sleeve assemblies, which is used for installing a positioning pin 17.

[0047] The sliding assembly 6 includes a pull rod 10, a spring 11 and a sliding block 12. The pull rod body passes through the columnar through hole and the elongated through hole 401 of the bottom plate 4 in sequence. The spring 11 is sleeved on the pull rod 10, and the both ends of the spring 11 are limited between the inner end surface of the columnar through hole and the core shaft of the third shaft sleeve assembly 9. The lower end of the core shaft of the third shaft sleeve assembly is fixedly connected with the pull rod 10 and the sliding block 12 in sequence, and the sliding block 12 is arranged in the axial direction of the pull rod 10. The surface of the sliding block 12 is in contact with the surface of the guide groove 402 of the bottom plate 4, and the sliding block can slide on the guide groove 402. The third shaft sleeve assembly 9 can slide under the action of the spring 11 or the pull rod 10. Specifically, the pull rod 1 has a pin hole coaxial with the pin hole 403 on the bottom plate, which is used for fixing the position of the third shaft sleeve assembly by the positioning pin 17.

[0048] Each shaft sleeve assembly includes a multi-stage shaft sleeve 13 and a core shaft 14 coaxially installed in the multi-stage shaft sleeve. The outer wall of the core shaft 14 has external threads matched with the inner wall of the multi-stage shaft sleeve 13, and the both ends of the core shaft protrude out of the inner hole of the multi-stage shaft sleeve. The core shafts in the first and second shaft sleeve assemblies 7 and 8 are fixedly connected with the bottom plate by threads. The core shaft in the third shaft sleeve assembly is radially connected with the pull rod 10 by threads. The multi-stage shaft sleeve includes a screw sleeve 1301 and a first circular annular protrusion 1302, a second circular annular protrusion 1303 and a third circular annular protrusion 1304 coaxially arranged on the outer wall of the screw sleeve from top to bottom. The spaces formed between the first circular annular protrusion 1302 and the second circular annular protrusion 1303 and between the second circular annular protrusion 1303 and the third circular annular protrusion 1304 are used for giving space for the spline teeth on both ends of the inner wall of the central through hole of the disc-shaped part. The side wall of the second circular annular protrusion 1303 can be in contact with the inner wall surface of the central through hole of the disc-shaped part to radially support the inner wall of the disc-shaped part. The upper end surface of the third circular annular protrusion 1304 is provided with a conical annular protrusion 1305 at the joint with the rod body of the screw sleeve 1301. The conical annular protrusion 1305 can be in contact with the inner side of the end surface of the annular boss 1602 of the disc-shaped part to axially support the disc-shaped part. Specifically, the multi-stage shaft sleeve is made of soft material, and nylon is preferred in the embodiment.

[0049] The baffle 5 is installed on the top of the three shaft sleeve assemblies and is parallel to the bottom plate of the shaft sleeve assemblies. The baffle 5 is used to prevent the disc-shaped part installed on the shaft sleeve assembly from being separated from the core shaft when the disc-shaped part axially moves. Specifically, the baffle 5 is Y-shaped, and the three ends of the baffle have screw holes matched with the core shafts of the shaft sleeve assemblies. The three ends of the baffle are threadedly connected with the core shafts of the shaft sleeve assemblies, respectively, and are fixed by bolts.

[0050] The size of the triangular pyramid frame, the installation height of the three clamp heads on the triangular pyramid frame, and the diameter of the anti-collision arc rod are determined according to the diameter and thickness of the disc-shaped part and the size of the fluorescent penetration tank.

[0051] Referring to Figures 7-9 The three disc-shaped parts are simultaneously installed on the corresponding clamp heads and are not shielded from each other.

[0052] In use, the baffle 5 is first disassembled, the positioning pin 17 installed on the bottom plate is removed, the pull rod 10 is pulled, and the third shaft sleeve assembly moves along the direction of approaching the first shaft sleeve assembly 7 and the second shaft sleeve assembly 8 under the action of the pull rod 10. When the third shaft sleeve assembly is located at the center of the symmetry axis of the bottom plate, the position of the third shaft sleeve assembly is locked through the positioning pin 17. Then, the disc-shaped part to be detected 16 is sleeved on the first shaft sleeve assembly and the second shaft sleeve assembly, the inner wall of the disc-shaped part is tangent to the outer wall of the multi-stage shaft sleeve on the first shaft sleeve assembly and the second shaft sleeve assembly, and the end face of the annular boss 1602 on the disc-shaped part is in contact with the conical annular protrusion 1305 on the multi-stage shaft sleeve, so that the conical annular protrusion 1305 axially holds the disc-shaped part. The positioning pin 17 is disassembled, and the pull rod 10 is loosened. The third shaft sleeve assembly 9 moves away from the first shaft sleeve assembly and the second shaft sleeve assembly along the direction of the spring 11 under the action of the spring 11. When the outer wall of the multi-stage shaft sleeve of the third shaft sleeve assembly 9 is tangent to the inner wall of the disc-shaped part, the disc-shaped part can rotate around its own axis under the support of the three shaft sleeve assemblies. The screw holes on the baffle 5 are aligned with the mandrels of the three shaft sleeve assemblies, the baffle 5 is rotated and installed on the top of the mandrel, and is fastened through the bolts. The lifting equipment lifts the disc-shaped part and the fluorescent penetrant testing clamp through the lifting ring 3, and immerses them in the fluorescent penetrant liquid.

[0053] The fluorescent penetrant testing clamp is suitable for the whole process of disc-shaped part fluorescent penetrant testing, including pretreatment, drying, penetration, penetrant removal, drying, phenomenon, observation and post-processing. The disc-shaped part can be sprayed and cleaned on all surfaces by rotating the disc-shaped part, and the disc-shaped part can be reliably immersed in the fluorescent liquid. The operator can directly visually observe the surface condition of the disc-shaped part without turning over the part, saving time and effort.

[0054] The above is only a specific implementation of the present utility model, but the protection scope of the present utility model is not limited thereto. Any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present utility model, and these modifications or replacements should be covered within the protection scope of the present utility model.

Claims

1. A fixture for fluorescent flaw detection of a disc-shaped part, wherein the disc-shaped part has a central through hole, the inner wall of the central through hole has a plurality of spline teeth at both ends, and one end face of the central through hole has an annular boss extending outward along its axial direction; characterized in that, The fluorescent flaw detection fixture includes a triangular pyramid frame, a fixture head, and a lifting ring disposed at the top of the triangular pyramid frame; The lifting ring is used to connect to the lifting equipment to lift the fluorescent flaw detection fixture and the disc-shaped part; Each clamping head includes a base plate, a baffle, a sliding assembly, and three bushing assemblies arranged circumferentially and vertically on the base plate; the three bushing assemblies have the same structure and are used to support the inner wall of the disc-shaped part and enable the disc-shaped part to rotate about its own axis. The three bushing assemblies include a first bushing assembly, a second bushing assembly, and a third bushing assembly; the first bushing assembly and the second bushing assembly are fixedly connected to the top surface of the base plate; The sliding component is mounted on the base plate and is perpendicular to the plane containing the first bushing assembly and the second bushing assembly; The base plate has an elongated through hole, and the length direction of the elongated through hole is perpendicular to the plane in which the first bushing assembly and the second bushing assembly are located. The lower end of the third bushing assembly is perpendicularly fixed to the sliding assembly; the third bushing assembly can slide along the elongated through hole under the drive of the sliding assembly. The three clamping heads are evenly distributed around the circumference on the lateral edges of the triangular pyramid frame and are located on the same horizontal plane; and the base plate of the clamping head is parallel to the cone surface where the installation position is located. The baffle is mounted on top of the three bushing assemblies to prevent the disc-shaped parts mounted on the bushing assemblies from detaching from the bushing assemblies.

2. The fixture for fluorescent flaw detection of disc-shaped parts according to claim 1, characterized in that, The bushing assembly includes a multi-stage bushing and a mandrel coaxially mounted within the multi-stage bushing. The outer wall of the mandrel has an external thread that mates with the inner wall of the multi-stage bushing, and both ends of the mandrel extend out of the inner hole of the multi-stage bushing. The mandrel in the first bushing assembly and the second bushing assembly is threadedly connected to the base plate; In the third bushing assembly, the lower end of the spindle is threadedly connected to the sliding assembly.

3. The fixture for fluorescent flaw detection of disc-shaped parts according to claim 2, characterized in that, The sliding assembly includes a slider, a pull rod, and a spring; The base plate has a columnar through hole coaxially connected with the elongated through hole, and the pull rod body passes through the columnar through hole and the elongated through hole in sequence; the spring is fitted on the pull rod, and the two ends of the spring are limited between the inner end face of the columnar through hole and the spindle of the third bushing assembly; The lower end of the spindle of the third bushing assembly is fixedly connected to the pull rod and the slider in sequence, and the slider is arranged along the axial direction of the pull rod; the third bushing assembly and the slider can slide under the force of the spring or the pull rod.

4. The fixture for fluorescent flaw detection of disc-shaped parts according to claim 3, characterized in that, Two guide grooves are formed on both sides of the bottom of the elongated through hole and along the axial direction of the pull rod. The surface of the slider is in contact with the surface of the guide grooves, and the slider can slide along the guide grooves.

5. The fixture for fluorescent flaw detection of disc-shaped parts according to claim 3, characterized in that, It also includes a locating pin; the base plate and the tie rod have coaxially opened pin holes for installing the locating pin to fix the position of the third bushing assembly.

6. A fixture for fluorescent flaw detection of disc-shaped parts according to claim 1 or 2, characterized in that, The base plate is an isosceles triangular plate, and the sliding component is arranged on the base plate along the line of symmetry of the base plate.

7. A fixture for fluorescent flaw detection of disc-shaped parts according to claim 1 or 2, characterized in that, It also includes three anti-collision arc rods to prevent damage to the edge teeth of the disc-shaped part during hoisting and movement; The anti-collision arc rod is fixedly supported on the triangular pyramid frame by several connecting rods; The anti-collision arc rod is coplanar with the disc-shaped part mounted on the clamp head, and the diameter of the anti-collision arc rod is the diameter of the disc-shaped part.

8. A fixture for fluorescent flaw detection of disc-shaped parts according to claim 2, characterized in that, The baffle is Y-shaped, and has threaded holes at three ends that mate with the mandrel. The three ends of the baffle are threadedly connected to the mandrel of the bushing assembly and fixed by bolts.

9. A fixture for fluorescent flaw detection of disc-shaped parts according to claim 1 or 2, characterized in that, A fixing block is provided on each of the three lateral edges of the triangular pyramid frame, and the fixing blocks are parallel to the cone surface of the triangular pyramid frame. The base plate of the bushing assembly is attached and fixed to the surface of the fixing block.

10. A fixture for fluorescent flaw detection of disc-shaped parts according to claim 2, characterized in that, The multi-stage bushing includes a threaded sleeve and a first annular protrusion, a second annular protrusion, and a third annular protrusion arranged coaxially from top to bottom on the outer wall of the threaded sleeve. The space formed between the first annular protrusion and the second annular protrusion, and between the second annular protrusion and the third annular protrusion, is used to make way for the spline teeth at both ends of the inner wall of the central through hole of the disc-shaped part. The second annular protruding sidewall can contact the inner wall surface of the central through hole of the disc-shaped part; The upper end face of the third annular protrusion has a conical annular protrusion at the junction with the threaded sleeve body; the conical annular protrusion can contact the inner side of the annular boss end face on the disc-shaped part to axially support the disc-shaped part.

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