Fluorescent magnetic powder flaw detection device with shading darkroom and use method of fluorescent magnetic powder flaw detection device

Abstract

The invention discloses a fluorescent magnetic powder inspection device with a shading darkroom and a using method thereof, and relates to the field of fluorescent magnetic powder inspection devices.The fluorescent magnetic powder inspection device comprises a fluorescent magnetic powder inspection instrument, a darkroom assembly is arranged at the bottom of the fluorescent magnetic powder inspection instrument, a framework assembly is connected into the shading hood, and a mounting circular truncated cone is connected to the top of the inner wall of the shading hood; the first connecting rod is rotationally connected between the framework assembly and the mounting circular truncated cone, the mounting circular truncated cone moves up and down, the size of the framework assembly is changed through the first connecting rod, and the fluorescent magnetic defect detector is mounted on the mounting circular truncated cone through the locking assembly. The arrangement mode that the fluorescent magnetic defect detector is matched with the darkroom assembly is utilized, a shading darkroom can be formed by the shading hood, the framework assembly, the mounting circular truncated cone and the first connecting rod, so that the influence of external luminosity on the detection precision of the fluorescent magnetic defect detector is reduced, the width of the shading darkroom can be adjusted by pressing the mounting circular truncated cone downwards, and the detection precision of the fluorescent magnetic defect detector is improved. And the detection height of the fluorescent magnetic defect detector is adjusted.

Description

Technical Field

[0001] The invention relates to the field of fluorescent magnetic particle flaw detection devices, and in particular to a fluorescent magnetic particle flaw detection device with a light-shielding darkroom and a use method thereof. Background Art

[0002] The fluorescent magnetic particle flaw detector is a non-destructive testing device specially used to detect surface or near-surface defects of ferromagnetic materials. It applies a magnetic field to the workpiece to be tested, and then applies fluorescent magnetic particles. It uses the leakage of magnetic lines of force at the defects to absorb the magnetic particles and form visible magnetic marks. Under ultraviolet light, these magnetic marks will fluoresce, so that even very small defects can be detected.

[0003] When using a fluorescent magnetic particle flaw detector to inspect castings produced in a workshop, the on-site inspection process is affected by the external ambient light, the harsh workshop environment and other unfavorable factors, resulting in unclear flaw detection results, unclear visibility of fine cracks, and crack omissions, which in turn affects the detection effect of the fluorescent magnetic particle flaw detector. Summary of the invention

[0004] The object of the present invention is to provide a fluorescent magnetic particle flaw detection device with a light-shielding darkroom and a method of using the same, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a fluorescent magnetic particle flaw detection device with a light-shielding darkroom, comprising a fluorescent magnetic particle flaw detector;

[0006] A darkroom component is provided at the bottom of the fluorescent magnetic particle flaw detector, and the darkroom component comprises:

[0007] A light shield, which is sleeved on the bottom of the outer wall of the fluorescent magnetic particle flaw detector;

[0008] A frame assembly, the frame assembly being connected to the interior of the sunshade;

[0009] A mounting truncated platform, wherein the mounting truncated platform is connected to the top of the inner wall of the light shield;

[0010] A first connecting rod, wherein the first connecting rod is rotatably connected between the frame assembly and the mounting truncated table, and the mounting truncated table moves up and down, and the size of the frame assembly is changed through the first connecting rod;

[0011] A locking assembly, wherein the fluorescent magnetic particle flaw detector is installed on the mounting round table through the locking assembly.

[0012] Preferably, the skeleton assembly comprises:

[0013] A support column, wherein the support column is vertically arranged inside the light shield;

[0014] A connecting rod assembly, wherein the connecting rod assembly is connected between adjacent support columns;

[0015] A limit assembly is arranged outside the support column, and the limit assembly is linked with the connecting rod assembly.

[0016] Preferably, the skeleton assembly further comprises:

[0017] A first mounting block, wherein the first mounting block is fixedly connected to the top of the supporting column, and one side of the first mounting block is fixedly connected to the light shield;

[0018] A second mounting block, wherein the second mounting block is fixedly connected to the bottom of the supporting column, and a side of the second mounting block is fixedly connected to the light shield;

[0019] A shaft rod, the other side of the first mounting block and the side of the mounting truncated table are both provided with slots, the shaft rod is fixedly connected to the inside of the slot, and the outer wall of the shaft rod is rotatably interlaced and sleeved with the first connecting rod.

[0020] Preferably, the connecting rod assembly comprises:

[0021] A connecting sleeve, wherein the connecting sleeve is slidably sleeved on the outside of the supporting column, and an end of the connecting sleeve corresponds to the limiting assembly;

[0022] a second connecting rod, an end of which is rotatably connected to the connecting sleeve;

[0023] A third connecting rod, the end of which is rotatably connected to the connecting sleeve.

[0024] Preferably, a hinge is connected to the side of the connecting sleeve, and the end of the second connecting rod and the end of the third connecting rod are rotatably connected to the connecting sleeve through the hinge, the second connecting rod and the third connecting rod are cross-arranged, and the intersection between the second connecting rod and the third connecting rod is rotatably connected with a pin shaft.

[0025] Preferably, the limiting component comprises:

[0026] A fixing collar, the fixing collar being fixedly sleeved on the middle part of the outer wall of the supporting column;

[0027] A limiting collar, the limiting collar is fixedly connected to one end of the connecting sleeve facing the fixed collar, and the limiting collar is slidably sleeved with the supporting column;

[0028] A limit spring is slidably sleeved on the outside of the support column.

[0029] Preferably, the limit spring is located between the fixing ring and the limit ring, the outside of the support column is symmetrically sleeved with a corrugated sleeve, the corrugated sleeve is sleeved on the outside of the limit spring, and the ends of the corrugated sleeve are respectively fixedly connected to the fixing ring and the limit ring.

[0030] Preferably, the locking assembly comprises:

[0031] A mounting collar, wherein the mounting collar is fixedly sleeved on the outside of the fluorescent magnetic particle flaw detector;

[0032] A positioning plate, the top of which is fixedly connected to the mounting collar;

[0033] A locking collar, wherein the locking collar is slidably sleeved on the bottom of the outer wall of the fluorescent magnetic particle flaw detector;

[0034] A locking rod is slidably engaged between the locking collar and the positioning plate.

[0035] Preferably, the mounting collar and the locking collar are respectively located at the top and the bottom of the mounting table, the top of the mounting table is provided with a through hole matching the fluorescent magnetic particle flaw detector, the top of the mounting table is provided with a connecting hole matching the positioning plate, the top of the locking collar is provided with a docking hole matching the positioning plate, one side of the inner wall of the docking hole is provided with a mounting groove matching the locking rod, the bottom of one side of the positioning plate is provided with a locking hole, one end of the outer wall of the locking rod is slidably engaged with the inner cavity of the locking hole, the inner cavity of the mounting groove is slidably sleeved with a positioning spring, the bottom of the locking collar is provided with a sliding hole linked to the inner cavity of the mounting groove, the inner cavity of the sliding hole is slidably sleeved with a handle, the top of the handle is fixedly connected to the locking rod, and an arc plate is fixedly connected between adjacent handles.

[0036] The present invention also provides a method for using a fluorescent magnetic particle flaw detection device with a light-shielding darkroom, comprising the following specific steps:

[0037] Step 1: When using a fluorescent magnetic particle flaw detector to inspect a casting, first apply fluorescent magnetic powder to the inspection area of ​​the casting, and then use the fluorescent magnetic particle flaw detector to drive the light shield to form a light-shielding darkroom outside the casting;

[0038] Step 2: The mounting truncated table is pressed toward the direction of the skeleton component. The mounting truncated table pushes the skeleton component to expand through the first connecting rod, so that the light shield is unfolded, and the light shield is put on the outside of the casting to form a light-shielding darkroom outside the casting. The fluorescent magnetic particle flaw detector performs flaw detection on the casting;

[0039] Step 3: When storing the fluorescent magnetic particle flaw detector, the frame assembly and the light shield, squeeze the mounting table toward the inside of the light shield. The mounting table drives the first connecting rod to rotate into the light shield. The first connecting rod tends to a vertical state. The frame assembly is stored and shrunk, and the light shield is folded. The light shield wraps and stores the fluorescent magnetic particle flaw detector.

[0040] Technical effects and advantages of the present invention:

[0041] (1) The present invention utilizes a setting method in which a fluorescent magnetic particle flaw detector and a darkroom component are matched. The darkroom component includes a light shielding cover, a frame component, a mounting truncated table, and a first connecting rod. The light shielding cover, the frame component, the mounting truncated table, and the first connecting rod can form a light-shielding darkroom, thereby reducing the influence of external light intensity on the detection accuracy of the fluorescent magnetic particle flaw detector. By pressing down the mounting truncated table, the width of the light-shielding darkroom can be adjusted, and the detection height of the fluorescent magnetic particle flaw detector can be adjusted.

[0042] (2) The present invention utilizes a configuration in which a fluorescent magnetic particle flaw detector, a mounting table and a locking assembly cooperate with each other. The locking assembly includes a mounting collar, a positioning plate, a locking collar, a locking rod, a positioning spring and a handle. Under the action of the positioning spring, the locking rod can be in a stable state and clamped with the positioning plate, thereby ensuring the stability of the installation of the fluorescent magnetic particle flaw detector. The fluorescent magnetic particle flaw detector can be directly disassembled by using the handle to drive the locking rod to separate from the positioning plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0044] Figure 2 It is a partial structural schematic diagram of the skeleton assembly of the present invention.

[0045] Figure 3 It is a schematic diagram of the internal structure of the front side of the light shield of the present invention.

[0046] Figure 4 It is a schematic diagram of the top structure of the skeleton assembly of the present invention.

[0047] Figure 5 It is a schematic diagram of the internal structure of the corrugated sleeve on the front side of the present invention.

[0048] Figure 6 This is a schematic diagram of the internal structure of the front side of the truncated table installed in the present invention.

[0049] Figure 7 It is a schematic diagram of the internal structure of the locking collar part from the side of the present invention.

[0050] In the figure: 1. fluorescent magnetic particle flaw detector; 2. darkroom assembly; 21. light shield; 22. frame assembly; 221. support column; 222. connecting rod assembly; 2221. connecting sleeve; 2222. hinge; 2223. second connecting rod; 2224. third connecting rod; 2225. pin; 223. limit assembly; 2231. fixing collar; 2232. limit collar; 2233. limit spring; 2234. corrugated sleeve; 224. first mounting block; 225. second mounting block; 226. slot; 227. shaft; 23. mounting table; 24. first connecting rod; 25. locking assembly; 251. mounting collar; 252. positioning plate; 253. locking collar; 254. locking rod; 255. positioning spring; 256. handle; 257. sliding hole; 258. arc plate. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] The present invention provides Figure 1-7 The fluorescent magnetic particle flaw detection device with a light-shielding darkroom shown in the figure comprises a fluorescent magnetic particle flaw detector 1, a darkroom component 2 is arranged at the bottom of the fluorescent magnetic particle flaw detector 1, the darkroom component 2 comprises a light shielding cover 21, a skeleton component 22, a mounting truncated table 23, a first connecting rod 24 and a locking component 25, the light shielding cover 21 is sleeved on the bottom of the outer wall of the fluorescent magnetic particle flaw detector 1, the light shielding cover 21 is made of a light-proof cloth material, and the light shielding cover 21 has a certain toughness, the skeleton component 22 is connected to the inside of the light shielding cover 21, the mounting truncated table 23 is connected to the top of the inner wall of the light shielding cover 21, and the first connecting rod 24 is rotated The frame assembly 22 is dynamically connected between the frame assembly 22 and the mounting truncated table 23. The mounting truncated table 23 moves up and down. The size of the frame assembly 22 is changed by the first connecting rod 24. That is, the mounting truncated table 23 drives one end of the plurality of first connecting rods 24 to descend. When the first connecting rods 24 tend to move in a horizontal state, the frame assembly 22 expands to unfold the light shield 21. Conversely, the frame assembly 22 contracts to fold the light shield 21. The fluorescent magnetic particle flaw detector 1 is installed on the mounting truncated table 23 by the locking assembly 25. The fluorescent magnetic particle flaw detector 1 can be directly disassembled and maintained by releasing the locking assembly 25.

[0053] In particular, the skeleton assembly 22 includes a support column 221, a connecting rod assembly 222, a limiting assembly 223, a first mounting block 224, a second mounting block 225 and a shaft 227. The support column 221 is vertically arranged inside the sunshade 21, the connecting rod assembly 222 is connected between adjacent support columns 221, the limiting assembly 223 is arranged outside the support column 221, the limiting assembly 223 and the connecting rod assembly 222 form a linkage, the first mounting block 224 is fixedly connected to the top of the support column 221, and under the action of the limiting assembly 223, the movement of the connecting rod assembly 222 between the support columns 221 can be guaranteed. Stability, one side of the first mounting block 224 is fixedly connected to the light shield 21, the second mounting block 225 is fixedly connected to the bottom of the support column 221, the side of the second mounting block 225 is fixedly connected to the light shield 21, the other side of the first mounting block 224 and the side of the mounting table 23 are both provided with a slot 226, the shaft 227 is fixedly connected to the inside of the slot 226, the outer wall of the shaft 227 is rotatably inserted and sleeved with the first connecting rod 24, that is, when the mounting table 23 is moved up and down, the multiple first connecting rods 24 can move toward a vertical or horizontal state, thereby increasing or decreasing the distance between the multiple support columns 221.

[0054] Furthermore, the connecting rod assembly 222 includes a connecting sleeve 2221, a second connecting rod 2223 and a third connecting rod 2224. The connecting sleeve 2221 is slidably sleeved on the outside of the support column 221, and the end of the connecting sleeve 2221 corresponds to the limiting assembly 223. The end of the second connecting rod 2223 is rotatably connected to the connecting sleeve 2221, and the end of the third connecting rod 2224 is rotatably connected to the connecting sleeve 2221. The side of the connecting sleeve 2221 is connected with a hinge 2222. The end of the second connecting rod 2223 and the end of the third connecting rod 2224 are both rotatably connected to the connecting sleeve 2221 through the hinge 2222. The second connecting rod 2223 and the third connecting rod 2224 are cross-arranged, and the intersection between the second connecting rod 2223 and the third connecting rod 2224 is rotatably connected with a pin 2225, as shown in FIG. Figure 2 As shown, when the second connecting rod 2223 and the third connecting rod 2224 tend to move toward a horizontal state, the distance between two adjacent support columns 221 increases. Conversely, when the second connecting rod 2223 and the third connecting rod 2224 tend to move toward a vertical state, the distance between two adjacent support columns 221 decreases, and when the mounting table 23 drives the first connecting rod 24 to be in a horizontal state, the distance between adjacent support columns 221 is at a maximum, so that continuing to press the mounting table 23 downward can make the first connecting rod 24 located inside the skeleton assembly 22, so that a recessed portion is formed on the top of the light shielding cover 21, and then the fluorescent magnetic particle flaw detector 1 can be located in the recessed portion on the light shielding cover 21, so that the light shielding cover 21 wraps and stores the fluorescent magnetic particle flaw detector 1.

[0055] In particular, the limiting assembly 223 includes a fixing ring 2231, a limiting ring 2232 and a limiting spring 2233. The fixing ring 2231 is fixedly sleeved on the middle part of the outer wall of the support column 221. The limiting ring 2232 is fixedly connected to one end of the connecting sleeve 2221 facing the fixing ring 2231. The limiting ring 2232 is slidably sleeved on the support column 221. The limiting spring 2233 is slidably sleeved on the outside of the support column 221. The limiting spring 2233 is located between the fixing ring 2231 and the limiting ring 2232. Under the action of the limiting spring 2233, the support column 221 The two external connecting sleeves 2221 have an opposite elastic force, which can not only ensure the stability of the movement of the connecting rod assembly 222 on the support column 221, but also ensure the stability of the light shielding cover 21 when the fluorescent magnetic particle flaw detector 1 is stored. The outside of the support column 221 is symmetrically sleeved with a corrugated sleeve 2234, and the corrugated sleeve 2234 is sleeved on the outside of the limit spring 2233. The ends of the corrugated sleeve 2234 are respectively fixedly connected to the fixed ring 2231 and the limit ring 2232. The corrugated sleeve 2234 can avoid the light shielding cover 21 from being clamped when the limit spring 2233 is compressed.

[0056] Furthermore, the locking assembly 25 includes a mounting collar 251, a positioning plate 252, a locking collar 253 and a locking rod 254. The mounting collar 251 is fixedly sleeved on the outside of the fluorescent magnetic particle flaw detector 1, the top of the positioning plate 252 is fixedly connected to the mounting collar 251, the locking collar 253 is slidably sleeved on the bottom of the outer wall of the fluorescent magnetic particle flaw detector 1, the locking rod 254 is slidably clamped between the locking collar 253 and the positioning plate 252, the locking rod 254 is in an arc shape, the mounting collar 251 and the locking collar 253 are respectively located at the top and bottom of the mounting table 23, the top of the mounting table 23 is provided with a through hole matching the fluorescent magnetic particle flaw detector 1, the top of the mounting table 23 is provided with a connecting hole matching the positioning plate 252, the top of the locking collar 253 is provided with a docking hole matching the positioning plate 252, and one side of the inner wall of the docking hole is provided with a The bottom of the locking collar 253 is provided with a sliding hole 257 linked to the inner cavity of the mounting groove, and the inner cavity of the sliding hole 257 is slidably sleeved with a handle 256. The top of the handle 256 is fixedly connected to the locking rod 254, and an arc plate 258 is fixedly connected between adjacent handles 256. By rotating the handle 256 and the arc plate 258, multiple locking rods 254 can be driven to slide along a circular trajectory, thereby separating multiple locking rods 254 from the positioning plate 252, and the fluorescent magnetic particle flaw detector 1 can be directly disassembled.

[0057] The present invention also provides a method for using a fluorescent magnetic particle flaw detection device with a light-shielding darkroom, comprising the following specific steps:

[0058] When using the fluorescent magnetic particle flaw detector 1 to perform flaw detection on a casting, firstly, fluorescent magnetic particles are applied to the detection part of the casting, and then the fluorescent magnetic particle flaw detector 1 drives the light shielding cover 21 to form a light-shielding dark room outside the casting;

[0059] The mounting truncated platform 23 is pressed toward the direction of the skeleton component 22, and the mounting truncated platform 23 pushes the skeleton component 22 to expand through the first connecting rod 24, so that the light shielding cover 21 is unfolded, and the light shielding cover 21 is sleeved on the outside of the casting to form a light-shielding darkroom outside the casting, and the fluorescent magnetic particle flaw detector 1 performs flaw detection on the casting;

[0060] When storing the fluorescent magnetic particle flaw detector 1, the frame assembly 22 and the light shield 21, the mounting table 23 is pressed toward the inside of the light shield 21, and the mounting table 23 drives the first connecting rod 24 to rotate into the light shield 21. The first connecting rod 24 tends to a vertical state, the frame assembly 22 is stored and shrunk, and the light shield 21 is folded, and the light shield 21 wraps and stores the fluorescent magnetic particle flaw detector 1.

[0061] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fluorescent magnetic particle flaw detection device with a light-shielding darkroom, comprising a fluorescent magnetic particle flaw detector (1); It is characterized in that A darkroom component (2) is arranged at the bottom of the fluorescent magnetic particle flaw detector (1), and the darkroom component (2) comprises: A light shield (21), wherein the light shield (21) is sleeved on the bottom of the outer wall of the fluorescent magnetic particle flaw detector (1); A frame assembly (22), wherein the frame assembly (22) is connected to the interior of the light shield (21); A mounting truncated platform (23), wherein the mounting truncated platform (23) is connected to the top of the inner wall of the light shield (21); A first connecting rod (24), wherein the first connecting rod (24) is rotatably connected between the frame assembly (22) and the mounting truncated platform (23), and the mounting truncated platform (23) moves up and down, and the size of the frame assembly (22) is changed through the first connecting rod (24); A locking assembly (25), wherein the fluorescent magnetic particle flaw detector (1) is mounted on the mounting truncated table (23) via the locking assembly (25).

2. A fluorescent magnetic particle flaw detection device with a light-shielding darkroom according to claim 1, characterized in that: The skeleton assembly (22) comprises: A support column (221), wherein the support column (221) is arranged in a vertical state inside the light shield (21); A connecting rod assembly (222), wherein the connecting rod assembly (222) is connected between adjacent support columns (221); A position limiting assembly (223), wherein the position limiting assembly (223) is arranged outside the support column (221), and the position limiting assembly (223) forms a linkage with the connecting rod assembly (222).

3. The fluorescent magnetic particle flaw detection device with a light-shielding darkroom according to claim 2, characterized in that: The skeleton assembly (22) further comprises: A first mounting block (224), the first mounting block (224) being fixedly connected to the top of the support column (221), and one side of the first mounting block (224) being fixedly connected to the light shield (21); A second mounting block (225), the second mounting block (225) being fixedly connected to the bottom of the support column (221), and the side of the second mounting block (225) being fixedly connected to the light shield (21); A shaft rod (227), the other side of the first mounting block (224) and the side of the mounting truncated table (23) are both provided with a slot (226), the shaft rod (227) is fixedly connected to the inside of the slot (226), and the outer wall of the shaft rod (227) is rotatably interlaced and sleeved with the first connecting rod (24).

4. The fluorescent magnetic particle flaw detection device with a light-shielding darkroom according to claim 2, characterized in that: The connecting rod assembly (222) comprises: A connecting sleeve (2221), wherein the connecting sleeve (2221) is slidably sleeved on the outside of the supporting column (221), and an end of the connecting sleeve (2221) corresponds to the limiting assembly (223); A second connecting rod (2223), an end of which is rotatably connected to the connecting sleeve (2221); A third connecting rod (2224), the end of which is rotatably connected to the connecting sleeve (2221).

5. The fluorescent magnetic particle flaw detection device with a light-shielding darkroom according to claim 4, characterized in that: The side of the connecting sleeve (2221) is connected with a hinge (2222); the end of the second connecting rod (2223) and the end of the third connecting rod (2224) are rotatably connected to the connecting sleeve (2221) via the hinge (2222); the second connecting rod (2223) and the third connecting rod (2224) are cross-arranged; the intersection between the second connecting rod (2223) and the third connecting rod (2224) is rotatably connected with a pin shaft (2225).

6. The fluorescent magnetic particle flaw detection device with a light-shielding darkroom according to claim 4, characterized in that: The limiting component (223) comprises: A fixed collar (2231), wherein the fixed collar (2231) is fixedly sleeved on the middle portion of the outer wall of the support column (221); A limiting collar (2232), wherein the limiting collar (2232) is fixedly connected to one end of the connecting sleeve (2221) facing the fixing collar (2231), and the limiting collar (2232) is slidably sleeved with the supporting column (221); A limit spring (2233), wherein the limit spring (2233) is slidably sleeved on the outside of the support column (221).

7. The fluorescent magnetic particle flaw detection device with a light-shielding darkroom according to claim 6, characterized in that: The limit spring (2233) is located between the fixed collar (2231) and the limit collar (2232); the outside of the support column (221) is symmetrically sleeved with a corrugated sleeve (2234); the corrugated sleeve (2234) is sleeved on the outside of the limit spring (2233); and the ends of the corrugated sleeve (2234) are respectively fixedly connected to the fixed collar (2231) and the limit collar (2232).

8. The fluorescent magnetic particle flaw detection device with a light-shielding darkroom according to claim 1, characterized in that: The locking assembly (25) comprises: A mounting collar (251), wherein the mounting collar (251) is fixedly sleeved on the outside of the fluorescent magnetic particle flaw detector (1); A positioning plate (252), the top of which is fixedly connected to the mounting collar (251); A locking collar (253), wherein the locking collar (253) is slidably sleeved on the bottom of the outer wall of the fluorescent magnetic particle flaw detector (1); A locking rod (254) is slidably engaged between the locking collar (253) and the positioning plate (252).

9. The fluorescent magnetic particle flaw detection device with a light-shielding darkroom according to claim 8, characterized in that: The mounting collar (251) and the locking collar (253) are respectively located at the top and bottom of the mounting truncated platform (23); a through hole matching the fluorescent magnetic particle flaw detector (1) is provided at the top of the mounting truncated platform (23); a connecting hole matching the positioning plate (252) is provided at the top of the mounting truncated platform (23); a docking hole matching the positioning plate (252) is provided at the top of the locking collar (253); a mounting groove matching the locking rod (254) is provided on one side of the inner wall of the docking hole; and the positioning plate (252) is provided on the top of the locking collar (253). A locking hole is provided at the bottom of one side of the locking rod (252), one end of the outer wall of the locking rod (254) is slidably engaged with the inner cavity of the locking hole, the inner cavity of the mounting groove is slidably sleeved with a positioning spring (255), the bottom of the locking ring (253) is provided with a sliding hole (257) linked to the inner cavity of the mounting groove, the inner cavity of the sliding hole (257) is slidably sleeved with a handle (256), the top of the handle (256) is fixedly connected to the locking rod (254), and an arc plate (258) is fixedly connected between adjacent handles (256).

10. The method for using the fluorescent magnetic particle flaw detection device with a light-shielding darkroom according to any one of claims 1 to 9, characterized in that: The specific usage steps are as follows: Step 1: When using the fluorescent magnetic particle flaw detector (1) to perform flaw detection on the casting, firstly, fluorescent magnetic powder is applied to the detection part of the casting, and then the fluorescent magnetic particle flaw detector (1) drives the light shielding cover (21) to form a light-shielding dark room outside the casting; Step 2: The mounting truncated table (23) is pressed toward the skeleton component (22), and the mounting truncated table (23) pushes the skeleton component (22) to expand through the first connecting rod (24), so that the light shielding cover (21) is unfolded, and the light shielding cover (21) is sleeved on the outside of the casting to form a light-shielding darkroom outside the casting, and the fluorescent magnetic particle flaw detector (1) performs flaw detection on the casting; Step 3: When storing the fluorescent magnetic particle flaw detector (1), the frame assembly (22) and the light shield (21), the mounting truncated table (23) is pressed toward the inside of the light shield (21), and the mounting truncated table (23) drives the first connecting rod (24) to rotate into the light shield (21), and the first connecting rod (24) tends to a vertical state, the frame assembly (22) is stored and shrunk, and the light shield (21) is folded, and the light shield (21) wraps and stores the fluorescent magnetic particle flaw detector (1).

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