A shaft workpiece nondestructive flaw detection device

Abstract

The application belongs to the technical field of nondestructive testing, and particularly relates to a shaft workpiece nondestructive testing device, which comprises a detection frame, the upper side walls of the detection frame are fixedly connected with two installation plates in a left-right symmetry mode, two installation plates are rotatably connected with rotating rods on the opposite sides, the side wall of one of the installation plates is connected with a servo motor, the output end of the servo motor is drivingly connected with the rotating rod, and two rotating rods are connected with a to-be-tested straight-line four-cylinder plane crankshaft through installation assemblies on the opposite ends. The application can magnetize the straight-line four-cylinder plane crankshaft in sections, match with a full-coverage uniform liquid spraying mode, make the magnetic powder trace display clearer, facilitate capturing of fine cracks and hidden cracks, and the detection structure can move in real time in a self-adaptive mode along the eccentric track of the crankshaft rotation, full adhesion to the workpiece detection, solve the blind area problem existing in the fixed detection of the traditional equipment, and reduce the missed detection and misjudgment.

Description

Technical Field

[0001] This invention belongs to the field of non-destructive testing technology, and in particular relates to a non-destructive testing device for shaft workpieces. Background Technology

[0002] The inline four-cylinder planar crankshaft is a key shaft component of an internal combustion engine. It operates under complex alternating load conditions for a long time, and its surface is prone to defects such as fatigue cracks, which seriously threaten the operational safety of the internal combustion engine. Fluorescent magnetic particle testing is a common method for detecting surface defects of shaft components. Therefore, it is necessary to carry out magnetic particle testing on the machined inline four-cylinder planar crankshaft to identify defects on the surface of the workpiece in a timely manner.

[0003] During the inspection of an inline four-cylinder flat crankshaft using fluorescent magnetic particle testing, the crankshaft journals and connecting rod journals are eccentrically arranged, and the distance between two adjacent balance blocks is small. When the entire inline four-cylinder flat crankshaft is magnetized, the magnetic field distribution is uneven, which makes it difficult for the magnetic field strength in local areas of the crankshaft journals, connecting rod journals, and balance blocks to meet the standard. Small cracks in areas with weak magnetic fields cannot form a clear leakage magnetic field, which poses a risk of missed detection.

[0004] Meanwhile, the mutual obstruction between adjacent balance blocks prevents the detection light used for flaw detection from evenly and fully illuminating the hidden areas of the balance blocks, making it difficult for the detection probe and light source to be placed close to the part to be tested, thus creating a blind spot in the observation.

[0005] To address this issue, a non-destructive testing device for shaft workpieces is proposed. Summary of the Invention

[0006] The purpose of this invention is to address the above-mentioned problems by providing a non-destructive testing device for shaft workpieces.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a non-destructive testing device for shaft workpieces, comprising a testing frame, wherein two mounting plates are symmetrically fixedly connected to the upper sidewall of the testing frame, and rotating rods are rotatably connected to opposite sides of the two mounting plates; a servo motor is connected to the sidewall of one of the mounting plates, and the output end of the servo motor is drively connected to the rotating rod on that side; the opposite ends of the two rotating rods are connected to the inline four-cylinder planar crankshaft to be tested via a mounting assembly; and further comprising:

[0008] The spraying assembly is located on the upper side wall of the testing frame and behind the inline four-cylinder planar crankshaft, and can evenly spray the magnetic suspension liquid onto the surface of the inline four-cylinder planar crankshaft.

[0009] A magnetizing component, disposed inside the injection assembly, enables segmental magnetization of the inline four-cylinder planar crankshaft;

[0010] The mounting bracket is fixedly connected to the upper side wall of the testing frame. The mounting bracket has an inverted U-shaped structure. A lifting electric push rod is fixedly connected to the upper side wall of the mounting bracket. The moving end of the lifting electric push rod passes through the mounting bracket and is fixedly connected to a lifting plate. A drive motor is fixedly connected to the lower side wall of the lifting plate. The output end of the drive motor is connected to the testing component through a follow-up component.

[0011] In the aforementioned non-destructive testing device for shaft workpieces, the mounting assembly includes two square tubes fixedly connected to the ends of two rotating rods away from the mounting plate. A square rod is movably inserted into the square tube and fixed inside the square tube by bolts. A limiting cylinder is fixedly connected to one end of the square rod extending out of the square tube. The two ends of the inline four-cylinder planar crankshaft to be tested are respectively inserted into the two limiting cylinders, and positioning bolts are threadedly connected to the side walls of the limiting cylinders.

[0012] In the aforementioned non-destructive testing device for shaft workpieces, the spraying assembly includes a first lead screw linear module fixedly connected to the upper side wall of the testing frame. A moving plate is fixedly connected to the moving end of the first lead screw linear module. A liquid storage tank is fixedly connected to the upper side wall of the moving plate. A bent pipe is fixedly connected to the side wall of the liquid storage tank near the inline four-cylinder planar crankshaft to be tested. A spray hood is fixedly connected to the upper end of the bent pipe. The spray hood has a hollow U-shaped structure. Multiple nozzles are fixedly connected to the inner wall of the spray hood. A pump is fixedly connected to the side wall of the liquid storage tank. The inlet end of the pump is connected to the liquid storage tank, and the outlet end of the pump is connected to the bent pipe.

[0013] In the aforementioned non-destructive testing device for shaft workpieces, the magnetizing component includes a connecting frame fixedly connected to the side of the liquid storage tank away from the bend. Two small electric push rods are connected to the side wall of the connecting frame. The moving ends of the two small electric push rods pass through the connecting frame and are connected to magnetizing contacts.

[0014] In the aforementioned non-destructive testing device for shaft workpieces, the follow-up component includes a guide rail fixedly connected to the output end of a drive motor. The inner walls of both sides of the guide rail are connected to the same sliding seat via springs. One end of the sliding seat extends out of the guide rail and is fixedly connected to a rotating plate. The upper side wall of the rotating plate is connected to two second lead screw linear modules. The moving ends of the two second lead screw linear modules pass through the rotating plate and are connected to bent rods. One end of each of the two bent rods is connected to a guide cylinder. The inner wall of the guide cylinder is connected to a lifting frame via springs. The lower end of the lifting frame on the right side extends out of the guide cylinder and is connected to a positioning component. The rod wall of the lifting frame on the right side is fixedly connected to a drive pin, and the rod wall of the lifting frame on the left side has a drive hole that matches the drive pin.

[0015] In the aforementioned non-destructive testing device for shaft workpieces, the positioning component includes a bidirectional lead screw module fixedly connected to the lower end of the right lifting frame. Both moving ends of the bidirectional lead screw module are connected to arc-shaped plates, and the inner wall of the arc-shaped plates is connected to multiple ball bearings.

[0016] In the aforementioned non-destructive testing device for shaft workpieces, the testing component includes a testing electric push rod fixedly connected to the lower side wall of the rotating plate. A lifting ring is fixedly connected to the moving end of the testing electric push rod. A vertical rod is fixedly connected to the lower side wall of the lifting ring. A flaw detection frame is connected to the lower end of the vertical rod and the left lifting frame. The flaw detection frame has a U-shaped structure, and multiple light sources and testing probes are connected to the outer wall of the flaw detection frame.

[0017] In the above-mentioned non-destructive testing device for shaft workpieces, the upper side wall of the testing frame is provided with a drain port, the lower side wall of the testing frame is fixedly connected with a guide cylinder covering the outside of the drain port, and a collection cylinder is provided below the guide cylinder.

[0018] Compared with existing technologies, the advantages of a non-destructive testing device for shaft workpieces are:

[0019] 1. This invention can flexibly adjust the clamping position according to the different lengths of inline four-cylinder flat crankshafts, and can be adapted to the inspection of various specifications of inline four-cylinder crankshafts, with a wider range of applications. At the same time, the clamping and fixing effect is good, and there will be no shaking, eccentricity or movement during the crankshaft rotation inspection process, avoiding the inspection deviation caused by unstable workpiece fixing, and making the overall flaw detection process more stable and reliable.

[0020] 2. This invention can segmentally magnetize a four-cylinder planar crankshaft, and with a full-coverage uniform spraying method, the magnetic powder traces are displayed more clearly, making it easier to capture minute cracks and hidden cracks. At the same time, the detection structure can adaptively move in real time following the eccentric trajectory of the crankshaft rotation, and is in close contact with the workpiece for detection throughout the process. This solves the blind spot problem of fixed detection in traditional equipment and reduces the occurrence of missed detections and false detections.

[0021] 3. The entire flaw detection process of this invention is fully automated from magnetization, liquid spraying, alignment detection to workstation switching. It eliminates the need for repeated manual adjustments, re-inspections, and disassembly / reassembly of workpieces. It can complete all-round detection of all key areas such as the journal and balance block of an inline four-cylinder plane crankshaft in one go, with comprehensive detection coverage. This not only saves a lot of manual operation costs but also improves the overall work efficiency of crankshaft flaw detection. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a non-destructive testing device for shaft workpieces provided by the present invention;

[0023] Figure 2 This is a schematic diagram of the surface structure of the mounting bracket in this invention;

[0024] Figure 3 This is a schematic diagram of the detection component in this invention;

[0025] Figure 4 This is a schematic diagram of the surface structure of the flaw detection frame in this invention;

[0026] Figure 5 This is a schematic diagram of the internal structure of the guide cylinder in this invention;

[0027] Figure 6 This is a schematic diagram of the internal structure of the guide rail in this invention;

[0028] Figure 7 This is a schematic diagram of the structure of the magnetization component in this invention;

[0029] Figure 8 This is a schematic diagram of the liquid spraying assembly in this invention;

[0030] Figure 9 This is a schematic diagram of the installation components in this invention.

[0031] In the diagram: 1. Detection frame, 2. Mounting plate, 3. Rotating rod, 4. Mounting frame, 5. Lifting electric push rod, 6. Lifting plate, 7. Drive motor, 8. Mounting assembly, 81. Square cylinder, 82. Square rod, 9. Limiting cylinder, 10. Spraying assembly, 101. First lead screw linear module, 102. Moving plate, 11. Storage tank, 12. Bend, 13. Spray hood, 14. Spray head, 15. Pump, 16. Magnetized component, 161. Connecting frame, 162. Small electric push rod, 17. Magnetized contact, 18. Follow-up assembly, 181. Guide 182 Sliding seat, 19 Rotary plate, 20 Second lead screw linear module, 21 Bending rod, 22 Guide cylinder, 23 Lifting frame, 24 Drive pin, 25 Drive hole, 26 Positioning component, 261 Bidirectional lead screw module, 262 Arc plate, 27 Ball bearing, 28 Detection component, 281 Detection electric push rod, 282 Lifting ring, 29 Vertical rod, 30 Flaw detector frame, 31 Light source, 32 Detection probe, 33 Drain port, 34 Guide cylinder, 35 Collection cylinder, 36 Servo motor. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] like Figure 1 , Figure 7 and Figure 9As shown, a non-destructive testing device for shaft workpieces includes a testing frame 1. Two mounting plates 2 are symmetrically fixedly connected to the upper side wall of the testing frame 1. Rotating rods 3 are rotatably connected to opposite sides of the two mounting plates 2. A servo motor 36 is connected to the side wall of one of the mounting plates 2. The output end of the servo motor 36 is connected to the rotating rod 3 on that side. The opposite ends of the two rotating rods 3 are connected to the inline four-cylinder planar crankshaft to be tested through a mounting assembly 8. The mounting assembly 8 includes two square tubes 81 fixedly connected to the ends of the two rotating rods 3 away from the mounting plates 2. Square rods 82 are movably inserted into the square tubes 81 and fixed to the square tubes 81 by bolts. One end of the square rod 82 extending out of the square tube 81 is fixedly connected to a limiting tube 9. The two ends of the inline four-cylinder planar crankshaft to be tested are respectively inserted into the two limiting tubes 9. The side wall of the limiting tube 9 is threaded with positioning bolts.

[0034] During operation, the operator adjusts the telescopic distance of the two square rods 82 inside the square tube 81 according to the overall length of the inline four-cylinder planar crankshaft to be tested, adapting it to the total length of the inline four-cylinder planar crankshaft. After adjustment, the square tube 81 and square rods 82 are locked with bolts to ensure the rigidity and stability of the support structure. Then, the shaft ends of the inline four-cylinder planar crankshaft are inserted into the left and right limiting tubes 9 respectively, and the positioning bolts on the side wall of the limiting tubes 9 are tightened to avoid eccentricity, wobbling, and axial movement during the rotation of the inline four-cylinder planar crankshaft. After clamping, the controller drives the servo motor 36 to work. The servo motor 36 drives the rotating rod 3, square tube 81, square rod 82 and limiting tube 9 to rotate synchronously, thereby driving the inline four-cylinder planar crankshaft to be tested to rotate at a uniform speed and smoothly. This structure, through its telescopic adjustable clamping design, is suitable for clamping inline four-cylinder crankshafts of various specifications, providing a stable rotational foundation for subsequent uniform magnetization and uniform liquid spraying.

[0035] like Figure 1 , Figure 7 , Figure 8 , Figure 9As shown, the device also includes a spraying assembly 10, which includes a first lead screw linear module 101 fixedly connected to the upper side wall of the testing frame 1. A moving plate 102 is fixedly connected to the moving end of the first lead screw linear module 101. A liquid storage tank 11 is fixedly connected to the upper side wall of the moving plate 102. A bent pipe 12 is fixedly connected to the side wall of the liquid storage tank 11 near the inline four-cylinder planar crankshaft to be tested. A spray hood 13 is fixedly connected to the upper end of the bent pipe 12. The spray hood 13 has a hollow U-shaped structure. Multiple nozzles 14 are fixedly connected to the inner wall of the spray hood 13. A pump 15 is fixedly connected to the side wall of the liquid storage tank 11. The inlet end of the pump 15 is connected to the storage tank 11, and the outlet end of the pump 15 is connected to the bend 12. The upper side wall of the detection frame 1 is provided with a drain port 33. The lower side wall of the detection frame 1 is fixedly connected with a guide cylinder 34 covering the outside of the drain port 33. A collection cylinder 35 is provided below the guide cylinder 34. The device also includes a magnetizing component 16. The magnetizing component 16 includes a connecting frame 161 fixedly connected to the side of the storage tank 11 away from the bend 12. The side wall of the connecting frame 161 is connected to two small electric push rods 162. The moving ends of the two small electric push rods 162 pass through the connecting frame 161 and are connected to magnetizing contacts 17.

[0036] During operation, after clamping, the controller activates the first lead screw linear module 101 to move the moving plate 102 and the upper liquid storage tank 11 horizontally, precisely aligning the U-shaped spray nozzle 13 onto the outside of the inline four-cylinder planar crankshaft to be tested. Then, the controller controls the servo motor 36 to rotate the inline four-cylinder planar crankshaft, adjusting each connecting rod journal and crankshaft journal to a horizontal testing position. Next, the small electric push rods 162 on both sides extend, causing two sets of magnetizing contacts 17 to precisely contact the key stress-bearing parts of the crankshaft, performing localized and precise magnetization of fatigue-prone areas such as connecting rod journals and crankshaft journals. Compared to overall magnetization, this structure offers highly targeted and efficient magnetization. The magnetic field strength in the key areas is sufficient to effectively excite magnetic traces in the cracks. After magnetization, the magnetization contact 17 is retracted, and the pump 15 is started to extract the magnetic suspension liquid inside the storage tank 11. It is then transported to the U-shaped spray nozzle 13 through the bend pipe 12 and sprayed evenly at multiple angles through multiple array nozzles 14. At the same time, the servo motor 36 drives the crankshaft to rotate at a low and uniform speed, so that the magnetic suspension liquid completely and evenly covers all journals, balance blocks, transition fillets and other key areas of the crankshaft, with no dead corners and no missed sprays. Excess magnetic suspension liquid flows into the guide cylinder 34 through the drain port 33 and finally falls into the collection cylinder 35 for centralized recycling. It can be filtered and reused, reducing consumable consumption and improving the working environment.

[0037] like Figures 1-6As shown, the device also includes a mounting frame 4, which is fixedly connected to the upper side wall of the detection frame 1. The mounting frame 4 has an inverted U-shaped structure. A lifting electric push rod 5 is fixedly connected to the upper side wall of the mounting frame 4. The moving end of the lifting electric push rod 5 passes through the mounting frame 4 and is fixedly connected to a lifting plate 6. A drive motor 7 is fixedly connected to the lower side wall of the lifting plate 6. The output end of the drive motor 7 is connected to the detection component 28 through a follower assembly 18. The follower assembly 18 includes a guide rail 181 fixedly connected to the output end of the drive motor 7. The inner walls of both sides of the guide rail 181 are connected to the same sliding seat 182 by springs. One end of the sliding seat 182 extends out of the guide rail 181 and is fixedly connected to a rotating plate 19. Two second lead screws are connected to the upper side wall of the rotating plate 19. The two second lead screw linear modules 20 have their moving ends passing through the rotating plate 19 and connected to bent rods 21. Each of the two bent rods 21 has a guide cylinder 22 connected to one end. The inner wall of the guide cylinder 22 is connected to a lifting frame 23 via a spring. The lower end of the right lifting frame 23 extends out of the guide cylinder 22 and is connected to a positioning component 26. The rod wall of the right lifting frame 23 is fixedly connected to a drive pin 24. The rod wall of the left lifting frame 23 has a drive hole 25 that matches the drive pin 24. The positioning component 26 includes a bidirectional lead screw module 261 fixedly connected to the lower end of the right lifting frame 23. Both moving ends of the bidirectional lead screw module 261 are connected to an arc plate 262. The inner wall of the arc plate 262 is connected to multiple balls 27.

[0038] During operation, the controller first controls the inline four-cylinder planar crankshaft to rotate to a suitable position, aligning multiple connecting rod journals and multiple crankshaft journals on the same vertical plane. Then, it controls the second lead screw linear module 20 to drive the two side bent rods 21 and guide cylinders 22 to move in opposite directions, ensuring precise alignment of the two side structures with the connecting rod journal areas. The lifting electric push rod 5 moves downwards along with the follower assembly 18 and detection assembly 28, causing the right-side positioning assembly 26 to fit against the outer side of the right-side connecting rod journal. Subsequently, the bidirectional lead screw module 261 is activated, driving two sets of arc-shaped plates 262 to clamp the outer wall of the journal. The inner wall ball bearings 27 achieve unobstructed rotation, without hindering crankshaft rotation or posing a risk of injury. The rotation of the inline four-cylinder planar crankshaft causes the connecting rod journals to eccentrically rotate. During compound motion, the right lifting frame 23 moves up and down and forward and backward synchronously with the journal. During vertical displacement, the right lifting frame 23 pulls the left lifting frame 23 vertically through the insertion and engagement of the drive pin 24 and the drive hole 25, ensuring synchronous lifting on both sides. During forward and backward eccentric displacement, the right guide cylinder 22 and the bent rod 21 pull the rotating plate 19 to move forward or backward as a whole. The sliding seat 182 can slide elastically and adaptively offset along the guide rail 181 to match the forward and backward displacement of the journal. At the same time, it drives the left structure to move synchronously, realizing that the journals of both sides follow each other without disengagement throughout the entire process. It perfectly adapts to the eccentric rotational motion characteristics of the crankshaft, ensuring that the detection component 28 and the workpiece always maintain a constant distance, eliminating the detection blind spot of the traditional fixed detection structure.

[0039] like Figure 2-5 As shown, the device also includes a detection component 28, which includes a detection electric push rod 281 fixedly connected to the lower side wall of the rotating plate 19. The moving end of the detection electric push rod 281 is fixedly connected to a lifting ring 282. The lower side wall of the lifting ring 282 is fixedly connected to a vertical rod 29. The lower ends of the vertical rod 29 and the left lifting frame 23 are both connected to a flaw detector frame 30. The flaw detector frame 30 has a U-shaped structure, and the outer wall of the flaw detector frame 30 is connected to multiple light sources 31 and detection probes 32.

[0040] During operation, the left flaw detector 30 moves in tandem with the left connecting rod journal throughout its entire movement. The light source 31 provides uniform illumination, eliminating blind spots and clearly highlighting magnetic particle crack traces. The detection probe 32 acquires real-time image data of the workpiece surface, enabling synchronous flaw detection of the connecting rod journal and corresponding balance block. For a fixed-position main journal, the position of the left flaw detector 30 can be adjusted independently via the second lead screw linear module 20 to precisely align and inspect the main journal area. After inspection of one side area is completed, the lifting electric push rod 5 raises the overall structure, and the drive motor 7 rotates the guide rail 181 and rotating plate 19 as a whole. By rotating the positioning component 26 and the flaw detector 30 by 180 degrees and switching their left and right positions, the above steps can be repeated to complete the full-area flaw detection on the other side of the inline four-cylinder planar crankshaft, greatly improving the detection efficiency. For the narrow area of ​​the main journal in the middle of the crankshaft, the lifting ring 282 and the vertical rod 29 are moved downward by the detection electric push rod 281, and the height of the corresponding flaw detector 30 is independently adjusted to accurately adapt to the flaw detection of the middle low-position area, thoroughly covering the key cracked parts such as the left and right connecting rod journals, front and rear main journals, and inner and outer balance blocks of the inline four-cylinder planar crankshaft, improving the detection accuracy of micro fatigue cracks and latent cracks, without the need for manual intervention throughout the process.

[0041] The operating principle of the present invention is explained as follows: The inline four-cylinder planar crankshaft is made of ferromagnetic carbon steel or alloy steel, which has good remanent magnetization characteristics. When magnetized, it can retain sufficient remanent magnetization. The surface and near-surface defects will form a leakage magnetic field to attract magnetic powder. Therefore, the remanent magnetization method can be used to carry out magnetic particle flaw detection. First, according to the length of the inline four-cylinder planar crankshaft to be tested, the extension and retraction of the square rod 82 of the mounting component 8 in the square tube 81 is adjusted and the bolts are locked. The shaft ends of the inline four-cylinder planar crankshaft to be tested are fixed inside the limit tubes 9 on both sides. The servo motor 36 drives the rotating rod 3 to drive the inline four-cylinder planar crankshaft to be tested to rotate smoothly.

[0042] Subsequently, the first lead screw linear module 101 drives the moving plate 102, the liquid storage tank 11 and the U-shaped spray nozzle 13 to translate and align the inline four-cylinder planar crankshaft to be tested. The small electric push rod 162 pushes the magnetized contact 17 to contact the connecting rod journal and the key area of ​​the crankshaft journal of the inline four-cylinder planar crankshaft to be tested to complete local magnetization. After magnetization and reset, the pump 15 sprays the magnetic suspension liquid in the liquid storage tank 11 evenly onto the surface of the crankshaft through the bend pipe 12 and the nozzle 14. Excess waste liquid is collected in the collection cylinder 35 through the drain port 33 and the guide cylinder 34 for recycling.

[0043] During testing, the lifting electric push rod 5 drives the lifting plate 6, drive motor 7, and follower assembly 18 to move downwards as a whole. The guide cylinders 22 on both sides are aligned with the connecting rod journals on both sides of the inline four-cylinder planar crankshaft to be tested through the second lead screw linear module 20 and the bent rod 21. The right bidirectional lead screw module 261 drives the arc plate 262 to fit and clamp one side of the connecting rod journal. The up-down and back-and-forth eccentric displacements generated by the rotation of the inline four-cylinder planar crankshaft are adapted by the cooperation of the drive pin 24 and the drive hole 25, and the elastic sliding of the sliding seat 182 and the guide rail 181. It achieves full-process tracking of the dual-sided structure; at the same time, the height of the electric push rod 281, lifting ring 282, vertical rod 29 and flaw detector 30 can be independently adjusted, which is suitable for the inspection of the narrow area in the middle of the inline four-cylinder planar crankshaft. The light source 31 on the flaw detector 30 provides supplementary lighting to brighten the magnetic traces, and the detection probe 32 collects flaw detection data in real time. After the inspection of one side is completed, the drive motor 7 can drive the rotating plate 19 to rotate 180° to change the left and right positions, so as to complete the full-area automated non-destructive flaw detection of the left and right connecting rod journals, front and rear main journals and inner and outer balance blocks of the inline four-cylinder planar crankshaft.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A non-destructive testing device for shaft workpieces, comprising a testing frame (1), wherein two mounting plates (2) are symmetrically fixedly connected to the upper side wall of the testing frame (1), and rotating rods (3) are rotatably connected to opposite sides of the two mounting plates (2), wherein a servo motor (36) is connected to the side wall of one of the mounting plates (2), and the output end of the servo motor (36) is drively connected to the rotating rod (3) on that side, characterized in that, The two rotating rods (3) are connected at opposite ends to the inline four-cylinder planar crankshaft under test via mounting assembly (8), and also include: The spraying assembly (10) is disposed on the upper side wall of the detection frame (1) and located behind the inline four-cylinder planar crankshaft, and can evenly spray the magnetic suspension liquid onto the surface of the inline four-cylinder planar crankshaft. A magnetizing component (16) is disposed inside the injection assembly (10) and is capable of segmentally magnetizing the inline four-cylinder planar crankshaft; Mounting bracket (4) is fixedly connected to the upper side wall of the detection bracket (1). The mounting bracket (4) has an inverted U-shaped structure. A lifting electric push rod (5) is fixedly connected to the upper side wall of the mounting bracket (4). The moving end of the lifting electric push rod (5) passes through the mounting bracket (4) and is fixedly connected to a lifting plate (6). A drive motor (7) is fixedly connected to the lower side wall of the lifting plate (6). The output end of the drive motor (7) is connected to the detection component (28) through a follower component (18).

2. The non-destructive testing device for shaft workpieces according to claim 1, characterized in that, The mounting assembly (8) includes two square tubes (81) fixedly connected to the ends of the two rotating rods (3) away from the mounting plate (2). A square rod (82) is movably inserted into the square tube (81). The square rod (82) is fixed inside the square tube (81) by bolts. A limiting cylinder (9) is fixedly connected to one end of the square rod (82) extending out of the square tube (81). The two ends of the inline four-cylinder planar crankshaft to be tested are respectively inserted into the two limiting cylinders (9). The side wall of the limiting cylinder (9) is threaded with positioning bolts.

3. The non-destructive testing device for shaft workpieces according to claim 1, characterized in that, The spray assembly (10) includes a first lead screw linear module (101) fixedly connected to the upper side wall of the test frame (1). The moving end of the first lead screw linear module (101) is fixedly connected to a moving plate (102). The upper side wall of the moving plate (102) is fixedly connected to a storage tank (11). The side wall of the storage tank (11) near the inline four-cylinder plane crankshaft to be tested is fixedly connected to a bend (12). The upper end of the bend (12) is fixedly connected to a spray hood (13). The spray hood (13) is a hollow U-shaped structure. The inner wall of the spray hood (13) is fixedly connected to multiple nozzles (14). The side wall of the storage tank (11) is fixedly connected to a pump (15). The inlet end of the pump (15) is connected to the storage tank (11), and the outlet end of the pump (15) is connected to the bend (12).

4. The non-destructive testing device for shaft workpieces according to claim 3, characterized in that, The magnetizing component (16) includes a connecting frame (161) fixedly connected to the side of the liquid storage tank (11) away from the bend (12). The side wall of the connecting frame (161) is connected to two small electric push rods (162). The moving ends of the two small electric push rods (162) pass through the connecting frame (161) and are connected to magnetizing contacts (17).

5. The non-destructive testing device for shaft workpieces according to claim 1, characterized in that, The follower assembly (18) includes a guide rail (181) fixedly connected to the output end of the drive motor (7). The inner walls of both sides of the guide rail (181) are connected to the same sliding seat (182) by springs. One end of the sliding seat (182) extends out of the guide rail (181) and is fixedly connected to a rotating plate (19). The upper side wall of the rotating plate (19) is connected to two second lead screw linear modules (20). The moving ends of the two second lead screw linear modules (20) pass through the rotating plate (19) and are connected to... There are two curved rods (21), and each of the two curved rods (21) is connected to a guide cylinder (22) at one end. The inner wall of the guide cylinder (22) is connected to a lifting frame (23) by a spring. The lower end of the lifting frame (23) on the right side extends out of the guide cylinder (22) and is connected to a positioning component (26). The rod wall of the lifting frame (23) on the right side is fixedly connected to a drive pin (24). The rod wall of the lifting frame (23) on the left side is provided with a drive hole (25) that matches the drive pin (24).

6. The non-destructive testing device for shaft workpieces according to claim 5, characterized in that, The positioning component (26) includes a bidirectional lead screw module (261) fixedly connected to the lower end of the right lifting frame (23). Both moving ends of the bidirectional lead screw module (261) are connected to an arc plate (262), and the inner wall of the arc plate (262) is connected to multiple balls (27).

7. The non-destructive testing device for shaft workpieces according to claim 5, characterized in that, The detection component (28) includes a detection electric push rod (281) fixedly connected to the lower side wall of the rotating plate (19). The moving end of the detection electric push rod (281) is fixedly connected to a lifting ring (282). The lower side wall of the lifting ring (282) is fixedly connected to a vertical rod (29). The lower ends of the vertical rod (29) and the left lifting frame (23) are both connected to a flaw detector (30). The flaw detector (30) has a U-shaped structure. The outer wall of the flaw detector (30) is connected to multiple light sources (31) and detection probes (32).

8. The non-destructive testing device for shaft workpieces according to claim 1, characterized in that, The upper side wall of the testing frame (1) is provided with a drain port (33), and the lower side wall of the testing frame (1) is fixedly connected with a guide cylinder (34) covering the outside of the drain port (33), and a collection cylinder (35) is provided below the guide cylinder (34).

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