Metal crack detection sensing device and detection sensing method

Abstract

The present invention discloses a metal crack detection sensor device and a detection sensor method, and relates to the technical field of metal crack detection. The present invention includes a magnetic particle flaw detector, wherein two groups of liquid storage tanks are arranged inside the magnetic particle flaw detector, a liquid pump is fixedly installed between the two groups of liquid storage tanks, two groups of probe rods are hinged at the bottom of the magnetic particle flaw detector, a probe is hinged at the bottom of the probe rod, and an adjustable spray box is fixedly installed at the bottom of the liquid storage tank. By controlling the swing of the probe rod, the probe rod drives the transmission rod to swing, and the transmission rod drives the piston gear rod to slide. The two groups of piston gear rods run synchronously under the action of the transmission wheel, and then the two groups of probe rods can be controlled to swing synchronously, and the angle adjustment is convenient. The transmission wheel is driven to rotate by the piston gear rod, and the transmission wheel drives the two groups of elastic partitions to change the spacing through the transmission assembly, and the flaw detection spacing and the spraying spacing can be adjusted synchronously, thereby greatly saving magnetic powder liquid and contrast enhancer, and saving detection costs.

Description

Technical Field

[0001] The present invention relates to the technical field of metal crack detection, and in particular to a metal crack detection sensing device and a detection sensing method. Background Art

[0002] Metal crack detection equipment is used to identify cracks and defects in metal materials to ensure the safety and reliability of structures and mechanical parts. Magnetic particle flaw detector is a commonly used equipment for metal crack detection. Magnetic particle flaw detector is suitable for wet magnetic particle detection of surface and near-surface cracks and minor defects caused by casting, quenching, processing, fatigue and other reasons of various small and medium-sized parts such as crankshafts, camshafts, spline shafts, etc. It is the preferred model for single-piece detection, small-batch sampling, and large-volume detection.

[0003] When using the existing magnetic particle flaw detector, magnetic powder and contrast enhancer are usually sprayed on the surface of the workpiece manually using a spray bottle. The manual spraying area is not fixed, and it is easy to miss spraying and over spraying, which will seriously waste magnetic powder and contrast enhancer. Especially when spraying contrast enhancer, spraying too much contrast enhancer will make it difficult to clean up later. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems and provide a metal crack detection sensor device and a detection sensor method.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0006] A metal crack detection sensor device comprises a magnetic particle flaw detector, wherein two groups of liquid storage tanks are arranged inside the magnetic particle flaw detector, a liquid pump is fixedly installed between the two groups of liquid storage tanks, a liquid inlet end of the liquid pump is respectively connected with the two groups of liquid storage tanks through a three-way solenoid valve, a flaw detection switch, a pump switch and a switching switch are arranged at the handle of the magnetic particle flaw detector, the flaw detection switch is used to control the magnetic particle flaw detector, the pump switch is used to control the power on and off of the liquid pump, and the switching switch is used to control the switching of the three-way solenoid valve, and two groups of probe rods are hinged at the bottom of the magnetic particle flaw detector, and a probe is hinged at the bottom of the probe rod;

[0007] An adjustable spray box is fixedly installed at the bottom of the liquid storage box, and a linear array of spray holes is opened at the bottom of the adjustable spray box. A transmission wheel is rotatably installed on the front of the adjustable spray box. A transmission assembly is arranged inside the adjustable spray box. A piston pressure plate is slidably connected to the internal sliding seal of the adjustable spray box. A conduit is fixedly installed at the bottom of the piston pressure plate, and the conduit is connected to the liquid outlet of the liquid pump. A guide groove is opened at the bottom of the piston pressure plate. Two groups of sealing sliders are slidably connected to the internal sealing of the guide groove. The transmission wheel can drive the two groups of sealing sliders to slide synchronously in the opposite direction through the transmission assembly. An elastic partition is fixedly installed at the bottom of the sealing slider.

[0008] Two groups of transmission air boxes are fixedly installed on the front of the adjustable spray box, and the internal sealing and sliding connection of the transmission air box is provided with a piston gear rod, and the two groups of piston gear rods are respectively meshed with the top and bottom of the transmission wheel. A transmission rod is hinged on the outer side of the probe rod, and the other end of the transmission rod is hinged to the piston gear rod. A one-way intake valve and a one-way exhaust valve are arranged on the outer side of the transmission air box, and the one-way exhaust valve is connected to the adjustable spray box through an air pipe, and the connection point is located above the piston pressure plate. A pressure relief pipe is arranged on the top of the adjustable spray box.

[0009] Furthermore, the transmission assembly includes a transmission shaft, a cross brace and a reel, the transmission shaft is rotatably installed inside the adjustable spray box, an active bevel gear is fixedly installed on the outside of the transmission shaft, a transmission wheel is fixedly installed on the front of the transmission shaft, and the transmission wheel is located on the front of the adjustable spray box, the cross brace is fixedly installed inside the adjustable spray box and is located above the transmission shaft, a sliding shaft is rotatably installed inside the cross brace, a driven bevel gear is fixedly installed on the bottom of the sliding shaft, the driven bevel gear is meshed with the active bevel gear, the reel is rotatably installed at the center of the guide slide groove, the reel is slidably sleeved on the slide shaft, the reel is respectively connected to two groups of sealing sliders through two groups of winding ropes, and a tension spring is arranged between the sealing slider and the inner wall of the guide slide groove.

[0010] Furthermore, the elastic partition is composed of an inner frame and a sealing rubber sleeve wrapped on the outer layer, and an elastic member is arranged in the middle of the inner frame.

[0011] Furthermore, a liquid discharge pipe is provided at the liquid outlet end of the liquid pump, a quick-connect connector is provided at the top end of the conduit, the quick-connect connector is fixedly mounted on the top of the adjustable spray box, and the liquid discharge pipe can be connected to the quick-connect connector.

[0012] Furthermore, both ends of the adjustable spray box are provided with clamps, and the clamps can be fixedly mounted on the magnetic particle flaw detector by bolts.

[0013] Furthermore, a fixed wheel is fixedly installed on the front of the magnetic particle flaw detector, and the center of the fixed wheel coincides with the swing center above the probe rod. A balance wheel and a reversing wheel are rotatably installed on the front of the probe rod, and the fixed wheel and the reversing wheel are respectively engaged with the top and bottom of the balance wheel. A driving pulley is fixedly installed on the front of the reversing wheel, and a driven pulley is fixedly installed on the front of the probe, and the driven pulley coincides with the hinge center of the probe, and the driven pulley is connected to the driving pulley through a transmission belt.

[0014] Furthermore, a first mounting plate is fixedly installed on the front of the magnetic particle flaw detector, a second mounting plate is fixedly installed on the front of the probe rod, a third mounting plate is fixedly installed on the front of the probe, the fixed wheel is fixedly installed on the first mounting plate, the balance wheel and the reversing wheel are both rotatably installed on the second mounting plate, and the driven pulley is fixedly installed on the third mounting plate.

[0015] Furthermore, the first mounting plate, the second mounting plate and the third mounting plate are all fixedly installed by clamps.

[0016] Furthermore, the transmission rod is hinged on the second mounting plate.

[0017] A metal crack detection sensing method comprises the following steps:

[0018] S1. Preparation: Inject the magnetic powder liquid and contrast enhancer into two sets of liquid storage tanks respectively, and then remove the dirt, grease and rust on the surface of the object to be inspected to ensure that the inspection surface is clean and pollution-free;

[0019] S2. Adjustment of flaw detection spacing: Adjust the angle between the two sets of probe rods to change the flaw detection spacing of the probes, and at the same time, the spray spacing of the adjustable spray box can be changed;

[0020] S3, magnetization: press the flaw detection switch, the magnetic particle flaw detector starts, and the workpiece is magnetized;

[0021] S4. Inspection: Press the pump switch to pump the contrast enhancer into the adjustable spray box, spray it on the inspection surface to form a contrast band. After the contrast enhancer is dry, open the pressure relief pipe. At this time, the elastic partition decreases its inclination angle under the action of elastic force, reducing the spraying interval. Then press the switch to control the switching of the three-way solenoid valve. Press the pump switch again to pump the magnetic powder liquid into the adjustable spray box. Spray it on the contrast band with a width smaller than the contrast band to form a magnetic powder band. The magnetic powder will gather at the defect under the action of the magnetic field. Observe the distribution of the magnetic powder and check the defect location and type.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1. The present invention controls the swing of the probe rod, which drives the transmission rod to swing, and the transmission rod drives the piston gear rod to slide. The two groups of piston gear rods run synchronously under the action of the transmission wheel, thereby controlling the two groups of probe rods to swing synchronously. The angle adjustment is convenient, and the transmission wheel is driven to rotate by the piston gear rod. The transmission wheel drives the two groups of elastic partitions to change the spacing through the transmission assembly, and the flaw detection spacing and the spraying spacing can be adjusted synchronously, thereby greatly saving magnetic powder liquid and contrast enhancer, and saving detection costs.

[0024] 2. The present invention presses the gas in the transmission air box into the adjustable spray box through the piston gear rod. The air pressure pushes the piston pressure plate downward, and the piston pressure plate presses the elastic partition obliquely. The air is exhausted when the magnetic powder liquid is sprayed, so that the spraying interval of the contrast enhancer can be larger than the spraying interval of the magnetic powder, the state of the magnetic powder can be clearly observed, and the detection effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ;

[0026] Figure 2 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ;

[0027] Figure 3 It is the exploded structure diagram of the present invention;

[0028] Figure 4 It is a schematic diagram of the structure of the adjustable spray box of the present invention;

[0029] Figure 5 This is an exploded structural diagram of the adjustable spray box of the present invention;

[0030] Figure 6 It is a schematic diagram of the structure of the piston pressure plate of the present invention;

[0031] Figure 7 It is a cross-sectional schematic diagram of the elastic partition of the present invention.

[0032] Figure numerals: 1, magnetic particle flaw detector; 11, flaw detection switch; 12, pump switch; 13, switching switch; 14, liquid storage tank; 15, liquid pump; 16, liquid discharge pipe; 17, probe rod; 18, probe; 2, adjustable spray box; 21, spray hole; 22, cross brace; 23, transmission shaft; 24, driving bevel gear; 25, transmission wheel; 26, sliding shaft; 27, driven bevel gear; 28, piston pressure plate; 281, guide slide groove; 282, reel; 283, sealing slide ; 284, tension spring; 285, elastic partition; 286, inner frame; 287, elastic part; 288, sealing rubber sleeve; 29, quick-connect connector; 210, pressure relief pipe; 3, transmission air box; 31, piston gear rod; 32, one-way intake valve; 33, one-way exhaust valve; 4, first mounting plate; 41, fixed wheel; 5, second mounting plate; 51, balance wheel; 52, reversing wheel; 53, driving pulley; 6, third mounting plate; 61, driven pulley; 7, transmission rod. DETAILED DESCRIPTION

[0033] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0034] Embodiment 1, as Figure 1-Figure 7As shown, a metal crack detection sensor device includes a magnetic particle flaw detector 1, two groups of liquid storage tanks 14 are arranged inside the magnetic particle flaw detector 1, a liquid pump 15 is fixedly installed between the two groups of liquid storage tanks 14, and the liquid inlet end of the liquid pump 15 is respectively connected with the two groups of liquid storage tanks 14 through a three-way solenoid valve. A flaw detection switch 11, a pump switch 12 and a switching switch 13 are arranged at the handle of the magnetic particle flaw detector 1. The flaw detection switch 11 is used to control the magnetic particle flaw detector 1, the pump switch 12 is used to control the power on and off of the liquid pump 15, and the switching switch 13 is used to control the switching of the three-way solenoid valve. Two groups of probe rods 17 are hinged at the bottom of the magnetic particle flaw detector 1, and a probe 18 is hinged at the bottom of the probe rod 17;

[0035] An adjustable spray box 2 is fixedly installed at the bottom of the liquid storage box 14, and a spray hole 21 is opened in a linear array at the bottom of the adjustable spray box 2. A transmission wheel 25 is rotatably installed on the front of the adjustable spray box 2. A transmission assembly is arranged inside the adjustable spray box 2. A piston pressure plate 28 is slidably connected to the inside of the adjustable spray box 2. A conduit is fixedly installed at the bottom of the piston pressure plate 28, and the conduit is connected to the liquid outlet of the liquid pump 15. A guide groove 281 is opened at the bottom of the piston pressure plate 28. Two groups of sealing slide blocks 283 are sealed and slidably connected inside the guide groove 281. The transmission wheel 25 can drive the two groups of sealing slide blocks 283 to slide synchronously in opposite directions through the transmission assembly. An elastic partition plate 285 is fixedly installed at the bottom of the sealing slide block 283.

[0036] Two groups of transmission air boxes 3 are fixedly installed on the front of the adjustable spray box 2. The internal sealing and sliding connection of the transmission air box 3 is connected with a piston gear rod 31. The two groups of piston gear rods 31 are respectively meshed with the top and bottom of the transmission wheel 25. The outer side of the probe rod 17 is hinged with a transmission rod 7, and the other end of the transmission rod 7 is hinged with the piston gear rod 31. A one-way intake valve 32 and a one-way exhaust valve 33 are arranged on the outer side of the transmission air box 3. The one-way exhaust valve 33 is connected to the adjustable spray box 2 through an air pipe, and the connection is located above the piston pressure plate 28. A pressure relief pipe 210 is arranged on the top of the adjustable spray box 2.

[0037] During detection, one of the probe rods 17 is pushed to swing, and the probe rod 17 drives one of the piston gear rods 31 to move through the transmission rod 7, and the piston gear rod 31 drives the other piston gear rod 31 to move in the opposite direction through the transmission wheel 25. The piston gear rod 31 drives another probe rod 17 to swing in the opposite direction synchronously through the transmission rod 7, so that the spacing between the two probes 18 can be quickly adjusted. At the same time, the transmission wheel 25 drives the two sealing slide blocks 283 to slide in the opposite direction synchronously through the transmission assembly, and the two sealing slide blocks 283 drive the two elastic partitions 285 to slide in the opposite direction synchronously. The piston gear rod 31 moves toward the transmission air box 3, and the gas inside the transmission air box 3 enters the adjustable spray box 2. The air pressure pushes the piston pressure plate 28 down, and the piston pressure plate 28 squeezes the elastic baffle 285. The two sets of elastic baffles 285 are in an eight-shaped shape. At this time, the number of spray holes 21 located between the two sets of elastic baffles 285 is large. Then press the flaw detection switch 11, the magnetic particle flaw detector 1 is started, and the workpiece is magnetized. After the magnetization is completed, press the pump switch 12, and the liquid pump 15 will store the liquid. The contrast enhancer in the box 14 is pumped into the adjustable spray box 2, and then sprayed out through the spray hole 21, and sprayed on the detection surface of the workpiece with a certain width, which can greatly save the use of the contrast enhancer. After the contrast enhancer is dried, the pressure relief pipe 210 is opened to discharge the gas above the piston pressure plate 28. At this time, the elastic partition 285 is reset under the action of elastic force, and the inclination angle of the elastic partition 285 is reduced. The elastic partition 285 pushes the piston pressure plate 28 to accelerate the gas discharge. At the same time, the number of spray holes 21 between the two groups of elastic partitions 285 is reduced. At this time, the switching switch 13 is pressed to control the switching of the three-way electromagnetic valve, and the pump switch 12 is pressed again, and the liquid pump 15 pumps the magnetic powder liquid in another group of liquid storage tanks 14 into the adjustable spray box 2, and then sprays it on the contrast enhancer through the spray hole 21, and the width of the magnetic powder spraying belt is smaller than the width of the contrast enhancer, so that the aggregation of the magnetic powder can be fully observed, and the detection effect is good. It should be noted that the liquid pump 15 adopts a plastic pump, and when the detection area is small, the gas discharged from the pressure relief pipe 210 can be blown to the contrast enhancer, which can accelerate the drying efficiency of the contrast enhancer;

[0038] By adopting the arrangement of the present invention, the spraying distance can be adjusted while adjusting the detection distance, thereby saving detection costs, and the contrast enhancement agent spraying width can be made just larger than the magnetic powder liquid spraying width, thereby achieving good detection effect.

[0039] Embodiment 2, based on the above embodiment, provides a transmission assembly structure;

[0040] like Figure 5As shown, the transmission assembly includes a transmission shaft 23, a cross brace 22 and a reel 282. The transmission shaft 23 is rotatably installed inside the adjustable spray box 2. A driving bevel gear 24 is fixedly installed on the outside of the transmission shaft 23. A transmission wheel 25 is fixedly installed on the front of the transmission shaft 23. The transmission wheel 25 is located on the front of the adjustable spray box 2. The cross brace 22 is fixedly installed inside the adjustable spray box 2 and is located above the transmission shaft 23. A sliding shaft 26 is rotatably installed inside the cross brace 22. A driven bevel gear 27 is fixedly installed at the bottom of the sliding shaft 26. The driven bevel gear 27 is meshed with the driving bevel gear 24. The reel 282 is rotatably installed at the center of the guide slide 281. The reel 282 is slidably sleeved on the slide 26. The reel 282 is connected to the two groups of sealing sliders 283 through two groups of winding ropes, and a tension spring 284 is arranged between the sealing slider 283 and the inner wall of the guide slide 281.

[0041] During detection, one of the probe rods 17 is pushed to swing, and the probe rod 17 drives one of the piston gear rods 31 to move through the transmission rod 7, and the piston gear rod 31 drives another group of piston gear rods 31 to move in the opposite direction through the transmission wheel 25. The piston gear rod 31 drives another probe rod 17 to swing in the opposite direction synchronously through the transmission rod 7, so that the spacing between the two groups of probes 18 can be quickly adjusted. At the same time, the transmission wheel 25 drives the transmission shaft 23 to rotate, the transmission shaft 23 drives the active bevel gear 24 to rotate, the active bevel gear 24 drives the driven bevel gear 27 to rotate, and the driven bevel gear 27 drives the sliding shaft 26 to rotate The sliding shaft 26 drives the reel 282 to rotate, and the reel 282 drives the two sets of sealing sliders 283 to slide in the opposite direction synchronously through the winding rope. The two sets of sealing sliders 283 drive the two sets of elastic partitions 285 to slide in the opposite direction synchronously, changing the distance between the two sets of elastic partitions 285. Since the reel 282 is slidably sleeved on the sliding shaft 26, the piston pressure plate 28 will not affect the transmission when it descends. At the same time, it is a sliding seal and will not leak. When the probe rod 17 swings outward, the reel 282 reverses, and the tension spring 284 drives the sealing sliders 283 to move away from each other. The transmission structure is simple and the transmission effect is good.

[0042] Embodiment 3, based on the above embodiment, provides an elastic partition 285 structure;

[0043] like Figure 7 As shown, the elastic partition 285 consists of an inner frame 286 and a sealing rubber sleeve 288 wrapped in an outer layer. An elastic member 287 is arranged in the middle of the inner frame 286. Through this design, the sealing performance of the elastic partition 285 can be greatly improved.

[0044] Embodiment 4, based on the above embodiment, further includes: a liquid discharge pipe 16 is provided at the liquid outlet end of the liquid pump 15, a quick-connect connector 29 is provided at the top of the conduit, the quick-connect connector 29 is fixedly installed on the top of the adjustable spray box 2, and the liquid discharge pipe 16 can be connected to the quick-connect connector 29. Through this design, the adjustable spray box 2 can be easily disassembled and assembled from the magnetic particle flaw detector 1.

[0045] Embodiment 5, based on the above embodiment, further includes that both ends of the adjustable spray box 2 are provided with clamps, and the clamps can be fixedly installed on the magnetic particle flaw detector 1 by bolts. Through this design, there is no need to change the structure of the existing magnetic particle flaw detector 1, and the adjustable spray box 2 can be directly installed, thereby reducing costs.

[0046] Embodiment 6, on the basis of the above embodiment, further includes: a fixed wheel 41 is fixedly installed on the front of the magnetic particle flaw detector 1, the center of the fixed wheel 41 coincides with the swing center above the probe rod 17, a balance wheel 51 and a reversing wheel 52 are rotatably installed on the front of the probe rod 17, the fixed wheel 41 and the reversing wheel 52 are respectively meshed at the top and bottom of the balance wheel 51, a driving pulley 53 is fixedly installed on the front of the reversing wheel 52, a driven pulley 61 is fixedly installed on the front of the probe 18, the driven pulley 61 coincides with the hinge center of the probe 18, and the driven pulley 61 is connected to the driving pulley 53 through a transmission belt.

[0047] The probe rod 17 is pushed to swing, and the probe rod 17 drives the balance wheel 51 to rotate relative to the fixed wheel 41. The balance wheel 51 rotates under the action of the fixed wheel 41, and the balance wheel 51 drives the reversing wheel 52 to rotate. The reversing wheel 52 drives the active pulley 53 to rotate, and the active pulley 53 drives the driven pulley 61 to rotate. The driven pulley 61 drives the probe 18 to swing synchronously in the opposite direction, and the swing angle is the same. That is to say, while the probe rod 17 swings, the probe 18 always remains vertically downward, and the detection distance adjustment is more convenient.

[0048] Embodiment 7, on the basis of the above embodiment, further includes: a first mounting plate 4 is fixedly installed on the front of the magnetic particle flaw detector 1, a second mounting plate 5 is fixedly installed on the front of the probe rod 17, a third mounting plate 6 is fixedly installed on the front of the probe 18, a fixed wheel 41 is fixedly installed on the first mounting plate 4, a balance wheel 51 and a reversing wheel 52 are both rotatably installed on the second mounting plate 5, and a driven pulley 61 is fixedly installed on the third mounting plate 6.

[0049] Furthermore, the first mounting plate 4, the second mounting plate 5 and the third mounting plate 6 are all fixedly mounted by clamps.

[0050] Furthermore, the transmission rod 7 is hinged on the second mounting plate 5 .

[0051] Through the arrangement of this embodiment, there is no need to drill holes on the existing magnetic particle flaw detector 1, and the fixed wheel 41, the balance wheel 51, the reversing wheel 52, the driving pulley 53 and the driven pulley 61 can all be quickly assembled on the magnetic particle flaw detector 1, further reducing costs.

[0052] Embodiment 8, based on the above embodiment, further includes: a metal crack detection sensing method, comprising the following steps:

[0053] S1. Preparation: Inject the magnetic powder liquid and contrast enhancer into two sets of liquid storage tanks 14 respectively, and then remove the dirt, grease and rust on the surface of the object to be inspected to ensure that the inspection surface is clean and pollution-free;

[0054] S2, flaw detection spacing adjustment: adjust the angle between the two sets of probe rods 17, change the flaw detection spacing of the probe 18, and at the same time change the spray spacing of the adjustable spray box 2;

[0055] S3, magnetization: press the flaw detection switch 11, the magnetic particle flaw detector 1 starts, and the workpiece is magnetized;

[0056] S4, detection: press the pump switch 12 to pump the contrast enhancer into the adjustable spray box 2, spray it on the detection surface to form a contrast band, and after the contrast enhancer is dry, open the pressure relief pipe 210. At this time, the elastic partition 285 decreases its inclination angle under the action of elastic force, reducing the spraying interval, and then press the switching switch 13 to control the switching of the three-way solenoid valve, and press the pump switch 12 again to pump the magnetic powder liquid into the adjustable spray box 2, spray it on the contrast band with a width smaller than the contrast band to form a magnetic powder band. The magnetic powder will gather at the defect under the action of the magnetic field, observe the distribution of the magnetic powder, and check the defect location and type.

[0057] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A metal crack detection sensor device, comprising a magnetic particle flaw detector (1), characterized in that: The magnetic particle flaw detector (1) is provided with two groups of liquid storage boxes (14) inside, and a liquid pump (15) is fixedly installed between the two groups of liquid storage boxes (14). The liquid inlet end of the liquid pump (15) is respectively connected to the two groups of liquid storage boxes (14) through a three-way solenoid valve. The handle of the magnetic particle flaw detector (1) is provided with a flaw detection switch (11), a pump switch (12) and a switching switch (13). The flaw detection switch (11) is used to control the magnetic particle flaw detector (1), the pump switch (12) is used to control the power on and off of the liquid pump (15), and the switching switch (13) is used to control the switching of the three-way solenoid valve. The bottom of the magnetic particle flaw detector (1) is hinged with two groups of probe rods (17), and the bottom of the probe rod (17) is hinged with a probe (18); An adjustable spray box (2) is fixedly mounted on the bottom of the liquid storage box (14); a linear array of spray holes (21) is provided on the bottom of the adjustable spray box (2); a transmission wheel (25) is rotatably mounted on the front of the adjustable spray box (2); a transmission assembly is arranged inside the adjustable spray box (2); a piston pressure plate (28) is slidably connected to the inside of the adjustable spray box (2); a conduit is fixedly mounted on the bottom of the piston pressure plate (28); the conduit is connected to the liquid outlet of the liquid pump (15); a guide slot (281) is provided on the bottom of the piston pressure plate (28); two groups of sealing slide blocks (283) are slidably connected to the inside of the guide slot (281); the transmission wheel (25) can drive the two groups of sealing slide blocks (283) to slide synchronously in opposite directions through the transmission assembly; an elastic partition plate (285) is fixedly mounted on the bottom of the sealing slide block (283); Two groups of transmission air boxes (3) are fixedly mounted on the front of the adjustable spray box (2). The interior of the transmission air box (3) is sealed and slidably connected with a piston gear rod (31). The two groups of piston gear rods (31) are respectively meshed with the top and bottom of the transmission wheel (25). The outer side of the probe rod (17) is hinged with a transmission rod (7). The other end of the transmission rod (7) is hinged with the piston gear rod (31). A one-way air intake valve (32) and a one-way air exhaust valve (33) are arranged on the outer side of the transmission air box (3). The one-way air exhaust valve (33) is connected to the adjustable spray box (2) through an air pipe, and the connection point is located above the piston pressure plate (28). A pressure relief pipe (210) is arranged on the top of the adjustable spray box (2).

2. A metal crack detection sensor device according to claim 1, characterized in that: The transmission assembly comprises a transmission shaft (23), a cross brace (22) and a reel (282); the transmission shaft (23) is rotatably mounted inside the adjustable spray box (2); an active bevel gear (24) is fixedly mounted on the outside of the transmission shaft (23); a transmission wheel (25) is fixedly mounted on the front of the transmission shaft (23); the transmission wheel (25) is located on the front of the adjustable spray box (2); the cross brace (22) is fixedly mounted inside the adjustable spray box (2) and is located above the transmission shaft (23); the inside of the cross brace (22) A sliding shaft (26) is rotatably mounted, a driven bevel gear (27) is fixedly mounted at the bottom of the sliding shaft (26), the driven bevel gear (27) is meshed with the driving bevel gear (24), the reel (282) is rotatably mounted at the center of the guide slide groove (281), the reel (282) is slidably sleeved on the sliding shaft (26), the reel (282) is respectively connected to two groups of sealing slide blocks (283) through two groups of winding ropes, and a tension spring (284) is provided between the sealing slide block (283) and the inner wall of the guide slide groove (281).

3. A metal crack detection sensor device according to claim 1, characterized in that: The elastic partition (285) comprises an inner frame (286) and a sealing rubber sleeve (288) wrapped on the outer layer, and an elastic member (287) is arranged in the middle of the inner frame (286).

4. A metal crack detection sensor device according to claim 1, characterized in that: The liquid outlet end of the liquid pump (15) is provided with a liquid discharge pipe (16), the top end of the conduit is provided with a quick-connect connector (29), the quick-connect connector (29) is fixedly mounted on the top of the adjustable spray box (2), and the liquid discharge pipe (16) can be connected to the quick-connect connector (29).

5. The metal crack detection sensor device according to claim 1, characterized in that: Both ends of the adjustable spray box (2) are provided with clamps, and the clamps can be fixedly mounted on the magnetic particle flaw detector (1) by means of bolts.

6. A metal crack detection sensor device according to claim 1, characterized in that: A fixed wheel (41) is fixedly mounted on the front of the magnetic particle flaw detector (1), and the center of the fixed wheel (41) coincides with the swing center above the probe rod (17). A balance wheel (51) and a reversing wheel (52) are rotatably mounted on the front of the probe rod (17), and the fixed wheel (41) and the reversing wheel (52) are respectively meshed at the top and bottom of the balance wheel (51). A driving pulley (53) is fixedly mounted on the front of the reversing wheel (52). A driven pulley (61) is fixedly mounted on the front of the probe (18), and the hinge centers of the driven pulley (61) and the probe (18) coincide with each other. The driven pulley (61) is connected to the driving pulley (53) through a transmission belt.

7. A metal crack detection sensor device according to claim 6, characterized in that: A first mounting plate (4) is fixedly mounted on the front of the magnetic particle flaw detector (1), a second mounting plate (5) is fixedly mounted on the front of the probe rod (17), a third mounting plate (6) is fixedly mounted on the front of the probe (18), the fixed wheel (41) is fixedly mounted on the first mounting plate (4), the balance wheel (51) and the reversing wheel (52) are both rotatably mounted on the second mounting plate (5), and the driven pulley (61) is fixedly mounted on the third mounting plate (6).

8. A metal crack detection sensor device according to claim 7, characterized in that: The first mounting plate (4), the second mounting plate (5) and the third mounting plate (6) are all fixedly mounted by means of clamps.

9. A metal crack detection sensor device according to claim 8, characterized in that: The transmission rod (7) is hinged on the second mounting plate (5).

10. A metal crack detection sensing method, using a metal crack detection sensing device as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Preparation: Inject magnetic powder liquid and contrast enhancer into two sets of liquid storage tanks (14) respectively, and then remove dirt, grease and rust on the surface of the object to be inspected to ensure that the inspection surface is clean and free of pollution; S2. Adjustment of the flaw detection interval: adjusting the angle between the two sets of probe rods (17), changing the flaw detection interval of the probe (18), and at the same time changing the spraying interval of the adjustable spray box (2); S3, magnetization: Press the flaw detection switch (11), the magnetic particle flaw detector (1) starts, and the workpiece is magnetized; S4, detection: Press the pump switch (12) to pump the contrast enhancer into the adjustable spray box (2), spray it on the detection surface to form a contrast band, and after the contrast enhancer is dried, open the pressure relief pipe (210). At this time, the elastic partition (285) decreases its inclination angle under the action of elastic force, reducing the spraying interval, and then press the switching switch (13) to control the switching of the three-way solenoid valve. Press the pump switch (12) again to pump the magnetic powder liquid into the adjustable spray box (2), spray it on the contrast band with a width smaller than the contrast band, and form a magnetic powder band. The magnetic powder will gather at the defect under the action of the magnetic field, observe the distribution of the magnetic powder, and check the defect location and type.

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