CN114235946A - Special magnetic particle flaw detector of multi-functional pin - Google Patents
Special magnetic particle flaw detector of multi-functional pin Download PDFInfo
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- CN114235946A CN114235946A CN202111537360.1A CN202111537360A CN114235946A CN 114235946 A CN114235946 A CN 114235946A CN 202111537360 A CN202111537360 A CN 202111537360A CN 114235946 A CN114235946 A CN 114235946A
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- 239000006249 magnetic particle Substances 0.000 title claims abstract description 17
- 238000005096 rolling process Methods 0.000 claims abstract description 55
- 239000000725 suspension Substances 0.000 claims abstract description 19
- 238000007789 sealing Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 abstract description 10
- 238000001514 detection method Methods 0.000 abstract description 2
- 239000006247 magnetic powder Substances 0.000 description 6
- 230000005415 magnetization Effects 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
- G01N27/84—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields by applying magnetic powder or magnetic ink
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- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The invention relates to the field of magnetic particle inspection machines, in particular to a magnetic particle inspection machine special for a multifunctional pin. The device comprises a rack and a magnetic suspension collecting tank, wherein a fixed electrode box, a movable coil box and a movable electrode box are sequentially arranged in the magnetic suspension collecting tank from left to right, and the movable coil box and the movable electrode box are both arranged on an electrode guide rail in a sliding manner; all be equipped with an electrode on the box of fixed electrode case, portable electrode case and press from both sides tight rolling device, two the electrode presss from both sides tight rolling device and sets up relatively, the end-to-end connection that the pin one side was examined to the tight rolling device orientation of electrode has the electrode chuck of disc, the electrode chuck orientation one side of examining the pin is connected with the work piece bracket. The improved special magnetic particle flaw detector for the pins is suitable for pins of various specifications, can automatically finish clamping the pins, can also realize rotating observation of the pins, and greatly improves the magnetic particle flaw detection efficiency of the pins.
Description
Technical Field
The invention relates to the field of magnetic particle inspection machines, in particular to a magnetic particle inspection machine special for a multifunctional pin.
Background
The pin is an important part of a running part of a locomotive or a passenger car, the quality of the pin is good and bad, the running safety is high, and particularly, after the railway transportation speed is accelerated, the quality requirement on the pin is higher and higher. The accident of train derailment caused by pin breakage has occurred in the railway transportation process. The Ministry of railways clearly proposes that the pins can be installed and used after passing the magnetic powder inspection. The pin used by the running part of the railway engine and the passenger train has a large variety, specification and quantity. Some manufacturers may even involve dozens of sizes of pins, and as many as thousands of pins of different sizes are produced daily. Therefore, the magnetic powder inspection workload of the pin is large.
The existing pin magnetic powder flaw detector can only detect a pin with one specification at a time; and when carrying out magnetic particle inspection to the pin, often need rely on the manpower to accomplish the clamp of pin, and can not rotate the observation to the pin, degree of automation is low, workman intensity of labour is high. These disadvantages result in low inspection efficiency of the pin in practice and easily cause missed inspection.
Disclosure of Invention
Aiming at the defects in the prior art, the improved special magnetic particle flaw detector for the pin is suitable for pins of various specifications, can automatically clamp the pin, can realize rotation observation of the pin, and greatly improves the magnetic particle flaw detection efficiency of the pin.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a special magnetic particle flaw detector of multi-functional pin, includes frame, magnetic suspension collecting vat, the magnetic suspension collecting vat is fixed in the frame, be equipped with fixed electrode case, removal coil case, portable electrode case in the magnetic suspension collecting vat from left to right in proper order, fixed electrode case is fixed in the magnetic suspension collecting vat. The bottom of the magnetic suspension collecting tank is provided with two parallel and horizontally arranged electrode guide rails, and the movable coil box and the movable electrode box are arranged on the electrode guide rails in a sliding manner. All be equipped with an electrode clamping rolling device on the box of fixed electrode case, portable electrode case, two the electrode clamping rolling device sets up relatively, the terminal connection that the pin one side was examined to the electrode clamping rolling device orientation has the electrode chuck of disc, the electrode chuck orientation one side of examining the pin is connected with the work piece bracket, be equipped with the V type groove that is used for placing the pin of examining on the work piece bracket, the work piece bracket with the electrode chuck passes through bolt fixed connection. One side that the pin was examined to the electrode chuck orientation still is connected with the second grade electrode chuck, the second grade electrode chuck is columnar structure and its diameter is greater than the diameter of examining the pin, the second grade electrode chuck with the electrode chuck passes through bolt fixed connection.
One side of each of the two electrode guide rails is provided with a rack. The bottom of the movable electrode box is provided with an electrode box bottom plate, and the electrode box bottom plate is connected with the electrode guide rail in a sliding mode through a sliding seat. An electrode box driving motor and an electrode box speed changing box are fixed above the bottom plate of the electrode box, and an output shaft of the electrode box speed changing box is connected with a chain wheel. The electrode box is characterized in that an electrode box rolling shaft is connected to the lower portion of the electrode box bottom plate through a bearing, two ends of the electrode box rolling shaft are meshed with the rack through an electrode box driven gear, and the electrode box speed changing box drives the electrode box rolling shaft to rotate through a chain.
Further, the outer ring of the electrode clamping rolling device is fixedly connected with a rolling driven sprocket, a rolling driving part is arranged below the electrode clamping rolling device, the rolling driving part comprises a driving rotating shaft and a driving sprocket, the driving rotating shaft is located under the electrode clamping rolling device, and the driving sprocket is fixed on the driving rotating shaft. And the two driving chain wheels on the driving rotating shaft are respectively positioned right below the two rolling driven chain wheels.
Furthermore, the electrode clamping and rolling device comprises a telescopic cylinder, a first fixing sleeve and a second fixing sleeve, the first fixing sleeve and the second fixing sleeve are fixedly connected with the movable electrode box and the fixed electrode box, and the telescopic cylinder is fixed on the first fixing sleeve. The telescopic air cylinder is characterized in that an air cylinder connector is connected to a piston rod of the telescopic air cylinder through threads, the air cylinder connector is sleeved in a first rotating shaft, the first rotating shaft is sleeved in a first fixing sleeve, one end of the air cylinder connector is abutted to the end face in the first rotating shaft through a thrust ball bearing, and a connector sealing cover is fixed to the tail end, located on one side of the air cylinder connector, of the first rotating shaft through a bolt. First fixed sleeve with the sprocket sleeve has been cup jointed between the first axis of rotation, the sprocket sleeve with be equipped with deep groove ball bearing between the first fixed sleeve, the sprocket sleeve with first axis of rotation passes through the key-type connection, the sprocket sleeve orientation wait to examine the one end fixedly connected with driven sprocket of examining the pin. The first rotating shaft is connected with a second rotating shaft through a flange, and the second rotating shaft is rotatably sleeved in the second fixing sleeve. One end of the second rotating shaft is fixedly connected with the electrode chuck. An insulating pad sleeve is arranged between the first rotating shaft and the second rotating shaft. And an electrode joint is sleeved outside the second rotating shaft.
Further, a coil box bottom plate is arranged at the bottom of the movable coil box and is in sliding connection with the electrode guide rail through a sliding seat. A coil box driving motor is fixedly arranged above the bottom plate of the coil box, and an output shaft of the coil box driving motor is connected with a chain wheel. The coil box is characterized in that a coil box rolling shaft is connected to the lower portion of the coil box bottom plate through a bearing, two ends of the coil box rolling shaft are meshed with the rack through a coil box driven gear, and the coil box driving motor drives the coil box rolling shaft to rotate through a chain.
Compared with the prior art, the invention has the beneficial effects that:
the electrode chuck is of a disc-shaped structure, pins of various specifications can be placed on the workpiece bracket, the secondary electrode chuck can clamp and magnetize pins with smaller sizes, and the magnetic powder flaw detector is higher in universality; the coil box driving motor drives the movable coil box to move, and the movable coil box can automatically move to the position of the pin to be detected and axially magnetize the pin; the fixed electrode box is fixed, the electrode box speed changing box drives the movable electrode box to move, automatic clamping of the pin to be detected can be achieved, and circumferential magnetization is carried out on the pin; the rolling driving part is rotated to realize the rotation of the electrode chuck, so that the rotation observation of the pin is facilitated; the electrode clamping and rolling device comprises a first rotating shaft and a second rotating shaft, and a modular structural form is adopted, so that the insulating effect is better.
Drawings
FIG. 1 is a schematic view of the front view of the magnetic powder inspection machine for a multifunctional pin according to the present invention.
Fig. 2 is a schematic sectional view along direction a in fig. 1.
Fig. 3 is a partially enlarged structural diagram of a portion B in fig. 2.
FIG. 4 is a schematic front view of the movable electrode case, the fixed electrode case, and the movable coil case according to the present invention.
FIG. 5 is a schematic front view of the movable electrode case and the fixed electrode case according to the present invention.
Fig. 6 is a schematic cross-sectional view along direction C in fig. 5.
Fig. 7 is a schematic three-dimensional outline structure of the electrode clamping and rolling device of the invention.
Fig. 8 is a front sectional structural view of the electrode clamping rolling device of the present invention.
Fig. 9 is a partially enlarged schematic view of a portion D in fig. 8.
In the figure: 1. a frame, 2, a magnetic suspension collecting tank, 3, a movable electrode box, 3.1, an electrode box driving motor, 3.2, an electrode box gearbox, 3.3, an electrode box roller, 3.4, an electrode box driven gear, 3.5, an electrode box bottom plate, 4, a fixed electrode box, 5, a movable coil box, 5.1, a coil box driving motor, 5.2, a coil box bottom plate, 5.3, a coil box roller, 5.4, a coil box driven gear, 6, an electrode guide rail, 7, a rolling driving part, 7.1, a driving rotating shaft, 7.2, a driving sprocket, 8, a rack, 9, an electrode clamping rolling device, 9.1, a telescopic cylinder, 9.2, a first fixed sleeve, 9.3, a sprocket sleeve, 9.4, a first rotating shaft, 9.5, a second fixed sleeve, 9.6, an electrode joint, 9.7, a second rotating shaft, 9.8, an insulating cushion, 9.9.9, an air cylinder joint, 9.10, a thrust ball bearing, a thrust bearing, a driving shaft, a driving chuck, a driving sleeve, 8, a driving wheel, a workpiece bracket 12, a secondary electrode chuck 13, a pin to be detected 14 and a driven chain wheel.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 4, the magnetic powder flaw detector special for the multifunctional pin comprises a rack 1 and a magnetic suspension collecting tank 2, wherein the magnetic suspension collecting tank 2 is fixed on the rack 1, a fixed electrode box 4, a movable coil box 5 and a movable electrode box 3 are sequentially arranged in the magnetic suspension collecting tank 2 from left to right, and the fixed electrode box 4 is fixed in the magnetic suspension collecting tank 2. Two parallel and horizontally arranged electrode guide rails 6 are arranged at the bottom of the magnetic suspension collecting tank 2, and the movable coil box 5 and the movable electrode box 3 are arranged on the electrode guide rails 6 in a sliding manner. All be equipped with an electrode clamping rolling device 9 on the box of fixed electrode case 4, removal electrode case 3, two electrode clamping rolling device 9 sets up relatively, electrode clamping rolling device 9 orientation is examined the end-to-end connection who waits pin 13 one side has the electrode chuck 10 of disc, electrode chuck 10 orientation one side of waiting to examine pin 13 is connected with work piece bracket 11, be equipped with on work piece bracket 11 and be used for placing the V type groove of waiting to examine pin 13, work piece bracket 11 with electrode chuck 10 passes through bolt fixed connection. Electrode holder 10 still is connected with second grade electrode holder 12 towards one side of waiting to examine pin 13, second grade electrode holder 12 is columnar structure and its diameter is greater than the diameter of waiting to examine pin 13, second grade electrode holder 12 with electrode holder 10 passes through bolt fixed connection.
As shown in fig. 5 and 6, one rack 8 is provided on each of the two electrode rails 6. The bottom of the movable electrode box 3 is provided with an electrode box bottom plate 3.5, and the electrode box bottom plate 3.5 is connected with the electrode guide rail 6 in a sliding way through a sliding seat. An electrode box driving motor 3.1 and an electrode box speed changing box 3.2 are fixed above the electrode box bottom plate 3.5, and an output shaft of the electrode box speed changing box 3.2 is connected with a chain wheel. The electrode box is characterized in that an electrode box roller 3.3 is connected to the lower portion of the electrode box bottom plate 3.5 through a bearing, two ends of the electrode box roller 3.3 are meshed with the rack 8 through an electrode box driven gear 3.4, and the electrode box speed changing box 3.2 drives the electrode box roller 3.3 to rotate through a chain.
As shown in fig. 7 to 9, in practical applications, a rolling driven sprocket 14 is fixedly connected to an outer ring of the electrode clamping rolling device 9, a rolling driving component 7 is arranged below the electrode clamping rolling device 9, the rolling driving component 7 includes a driving rotating shaft 7.1 and a driving sprocket 7.2, the driving rotating shaft 7.1 is located right below the electrode clamping rolling device 9, and the driving sprocket 7.2 is fixed to the driving rotating shaft 7.1. The two driving chain wheels 7.2 on the driving rotating shaft 7.1 are respectively positioned right below the two rolling driven chain wheels 14.
In practical application, the electrode clamping and rolling device 9 comprises a telescopic cylinder 9.1, a first fixed sleeve 9.2 and a second fixed sleeve 9.5, the first fixed sleeve 9.2 and the second fixed sleeve 9.5 are both fixedly connected with the movable electrode box 3 and the fixed electrode box 4, and the telescopic cylinder 9.1 is fixed on the first fixed sleeve 9.2. The telescopic cylinder 9.1 is characterized in that a piston rod is connected with a cylinder joint 9.9 through threads, the cylinder joint 9.9 is sleeved in a first rotating shaft 9.4, the first rotating shaft 9.4 is sleeved in a first fixing sleeve 9.2, one end of the cylinder joint 9.9 is abutted to the end face in the first rotating shaft 9.4 through a thrust ball bearing 9.10, and a joint sealing cover 9.11 is fixed at the tail end of one side of the cylinder joint 9.9 through a bolt on the first rotating shaft 9.4. First fixed sleeve 9.2 with sprocket sleeve 9.3 has been cup jointed between the first axis of rotation 9.4, sprocket sleeve 9.3 with be equipped with deep groove ball bearing between the first fixed sleeve 9.2, sprocket sleeve 9.3 with first axis of rotation 9.4 passes through the key-type connection, sprocket sleeve 9.3 orientation the one end fixedly connected with driven sprocket 14 of waiting to examine pin 13. The first rotating shaft 9.4 is connected with a second rotating shaft 9.7 through a flange, and the second rotating shaft 9.7 is rotatably sleeved in the second fixed sleeve 9.5. One end of the second rotating shaft 9.7 is fixedly connected with the electrode holder 10. An insulating cushion cover 9.8 is arranged between the first rotating shaft 9.4 and the second rotating shaft 9.7. An electrode joint 9.6 is sleeved outside the second rotating shaft 9.7.
As shown in fig. 2 and 3, in practical application, a bottom plate 5.2 of the coil box is arranged at the bottom of the movable coil box 5, and the bottom plate 5.2 of the coil box is slidably connected with the electrode guide rail 6 through a sliding seat. A coil box driving motor 5.1 is fixedly arranged above the coil box bottom plate 5.2, and an output shaft of the coil box driving motor 5.1 is connected with a chain wheel. The lower part of the coil box bottom plate 5.2 is connected with a coil box rolling shaft 5.3 through a bearing, two ends of the coil box rolling shaft 5.3 are meshed with the rack 8 through a coil box driven gear 5.4, and the coil box driving motor 5.1 drives the coil box rolling shaft 5.3 to rotate through a chain.
The invention discloses a special magnetic particle flaw detector for a train coupler body, which has the following use principle:
(1) electrode box gear box 3.2 drives movable electrode box 3 removes, and is two when the electrode chuck 10 distance is approximately equal to and waits to wait to examine the pin, will wait to examine the pin place in on the work piece bracket 11, movable electrode box 3 continues to move, utilizes the electrode chuck 10 realizes waiting to examine the clamp of pin tightly, treats that the pin of examining carries out circumference magnetization.
(2) Coil box driving motor 5.1 drives remove coil box 5 and remove, remove and wait to examine pin department and stop, carry out the axial magnetization to the pin.
(3) Rotate roll drive unit 7, driving sprocket 7.2 drives roll driven sprocket 14 rotates, and then realizes waiting the rotation of examining the pin.
(4) And after the workpiece is sprayed, magnetized and observed, demagnetizing the pin by using the electrode chuck 10 and the movable coil box 5.
(5) When the size of the pin to be inspected is small, the pin can be clamped by the secondary electrode chuck 12.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The utility model provides a special magnetic particle flaw detector of multi-functional pin which characterized in that: the magnetic suspension collecting tank is characterized by comprising a rack (1) and a magnetic suspension collecting tank (2), wherein the magnetic suspension collecting tank (2) is fixed on the rack (1), a fixed electrode box (4), a movable coil box (5) and a movable electrode box (3) are sequentially arranged in the magnetic suspension collecting tank (2) from left to right, and the fixed electrode box (4) is fixed in the magnetic suspension collecting tank (2); the bottom of the magnetic suspension collecting tank (2) is provided with two parallel and horizontally arranged electrode guide rails (6), and the movable coil box (5) and the movable electrode box (3) are arranged on the electrode guide rails (6) in a sliding manner; the electrode clamping and rolling device is characterized in that an electrode clamping and rolling device (9) is arranged on each of the fixed electrode box (4) and the movable electrode box (3), the two electrode clamping and rolling devices (9) are arranged oppositely, the tail end of one side, facing the pin (13) to be detected, of each electrode clamping and rolling device (9) is connected with an electrode chuck (10) in a disc shape, one side, facing the pin (13) to be detected, of each electrode chuck (10) is connected with a workpiece bracket (11), a V-shaped groove for placing the pin (13) to be detected is formed in each workpiece bracket (11), and each workpiece bracket (11) is fixedly connected with the corresponding electrode chuck (10) through bolts; one side, facing the pin (13) to be detected, of the electrode chuck (10) is also connected with a secondary electrode chuck (12), the secondary electrode chuck (12) is of a columnar structure, the diameter of the secondary electrode chuck is larger than that of the pin (13) to be detected, and the secondary electrode chuck (12) is fixedly connected with the electrode chuck (10) through a bolt;
one side of each of the two electrode guide rails (6) is provided with a rack (8); an electrode box bottom plate (3.5) is arranged at the bottom of the movable electrode box (3), and the electrode box bottom plate (3.5) is in sliding connection with the electrode guide rail (6) through a sliding seat; an electrode box driving motor (3.1) and an electrode box speed changing box (3.2) are fixed above the electrode box bottom plate (3.5), and an output shaft of the electrode box speed changing box (3.2) is connected with a chain wheel; the electrode box is characterized in that an electrode box rolling shaft (3.3) is connected to the lower portion of the electrode box bottom plate (3.5) through a bearing, two ends of the electrode box rolling shaft (3.3) are meshed with the rack (8) through an electrode box driven gear (3.4), and the electrode box speed changing box (3.2) is driven by a chain to rotate the electrode box rolling shaft (3.3).
2. The magnetic particle flaw detector special for the train coupler body of claim 1, characterized in that: the outer ring of the electrode clamping and rolling device (9) is fixedly connected with a rolling driven chain wheel (14), a rolling driving part (7) is arranged below the electrode clamping and rolling device (9), the rolling driving part (7) comprises a driving rotating shaft (7.1) and a driving chain wheel (7.2), the driving rotating shaft (7.1) is positioned right below the electrode clamping and rolling device (9), and the driving chain wheel (7.2) is fixed on the driving rotating shaft (7.1); two driving chain wheels (7.2) on the driving rotating shaft (7.1) are respectively positioned right below the two rolling driven chain wheels (14).
3. The magnetic particle flaw detector special for the train coupler body of claim 1, characterized in that: the electrode clamping and rolling device (9) comprises a telescopic cylinder (9.1), a first fixed sleeve (9.2) and a second fixed sleeve (9.5), the first fixed sleeve (9.2) and the second fixed sleeve (9.5) are fixedly connected with the movable electrode box (3) and the fixed electrode box (4), and the telescopic cylinder (9.1) is fixed on the first fixed sleeve (9.2); a piston rod of the telescopic cylinder (9.1) is connected with a cylinder joint (9.9) through threads, the cylinder joint (9.9) is sleeved in a first rotating shaft (9.4), the first rotating shaft (9.4) is sleeved in the first fixing sleeve (9.2), one end of the cylinder joint (9.9) abuts against the end face in the first rotating shaft (9.4) through a thrust ball bearing (9.10), and a joint sealing cover (9.11) is fixed at the tail end of the first rotating shaft (9.4) on one side of the cylinder joint (9.9) through a bolt; a chain wheel sleeve (9.3) is sleeved between the first fixed sleeve (9.2) and the first rotating shaft (9.4), a deep groove ball bearing is arranged between the chain wheel sleeve (9.3) and the first fixed sleeve (9.2), the chain wheel sleeve (9.3) and the first rotating shaft (9.4) are connected through a key, and one end, facing the pin (13) to be detected, of the chain wheel sleeve (9.3) is fixedly connected with a driven chain wheel (14); the first rotating shaft (9.4) is connected with a second rotating shaft (9.7) through a flange, and the second rotating shaft (9.7) is rotatably sleeved in the second fixed sleeve (9.5); one end of the second rotating shaft (9.7) is fixedly connected with the electrode chuck (10); an insulating pad sleeve (9.8) is arranged between the first rotating shaft (9.4) and the second rotating shaft (9.7); and an electrode joint (9.6) is sleeved outside the second rotating shaft (9.7).
4. The magnetic particle flaw detector special for the train coupler body of claim 1, characterized in that: a coil box bottom plate (5.2) is arranged at the bottom of the movable coil box (5), and the coil box bottom plate (5.2) is in sliding connection with the electrode guide rail (6) through a sliding seat; a coil box driving motor (5.1) is fixedly arranged above the coil box bottom plate (5.2), and an output shaft of the coil box driving motor (5.1) is connected with a chain wheel; the coil box is characterized in that a coil box roller (5.3) is connected to the lower portion of the coil box bottom plate (5.2) through a bearing, two ends of the coil box roller (5.3) are meshed with the rack (8) through a coil box driven gear (5.4), and a coil box driving motor (5.1) drives the coil box roller (5.3) to rotate through a chain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111537360.1A CN114235946A (en) | 2021-12-15 | 2021-12-15 | Special magnetic particle flaw detector of multi-functional pin |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111537360.1A CN114235946A (en) | 2021-12-15 | 2021-12-15 | Special magnetic particle flaw detector of multi-functional pin |
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| CN114235946A true CN114235946A (en) | 2022-03-25 |
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| CN202111537360.1A Pending CN114235946A (en) | 2021-12-15 | 2021-12-15 | Special magnetic particle flaw detector of multi-functional pin |
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