Piston rod flaw detection system and control method thereof

Abstract

The invention discloses a surface defect detection device for a piston rod, and aims to provide a piston rod flaw detection system capable of automatically performing defect detection on the outer surface of the piston rod, high in detection efficiency and capable of automatically classifying the piston rod, and a control method of the piston rod flaw detection system. According to the technical scheme, the automatic flaw detection system is characterized in that a feeding device, an eddy current flaw detection device and a discharging device are arranged to form full-process automatic flaw detection of a machined piston rod, and in the feeding process, treatment of impurities on the surface of the piston rod and demagnetization are completed through air box cleaning and treatment of a demagnetization structure; the eddy current flaw detection device adopts rotation driving in the axial direction of the piston rod and mobile scanning in the length direction of the piston rod to complete full-surface flaw detection of the piston rod, and can accurately distribute the material pushing rods to different material storage racks based on a flaw judgment result, so that the material pushing efficiency is improved, and the material pushing efficiency is improved. The invention is suitable for the technical field of piston rod detection.

Description

Technical Field

[0001] The present invention relates to a surface defect detection device for a piston rod, and more particularly to a piston rod flaw detection system and a control method thereof. Background Art

[0002] Piston rods often have various casting defects during the production process. Common defects include sand holes, sand sticking, air holes, keyholes, shrinkage, sand inclusions, scars, cracks, etc. The above defects will affect the structural performance and product quality of the piston rod. Therefore, the piston rods need to be inspected before leaving the factory to find the defect locations of the piston rods and deal with them.

[0003] Eddy current testing is a non-destructive testing technology commonly used for surface and near-surface defects of conductive materials. It mainly generates an alternating magnetic field around the detection coil when a detection coil with alternating current is close to a metal workpiece. This magnetic field induces eddy currents on the surface of the workpiece. When the workpiece has defects such as cracks, pores or corrosion, the eddy current path is destroyed, resulting in distortion of the eddy current distribution, which in turn changes the impedance of the coil. By measuring the change in the coil impedance, the system can identify the location, size and depth of the defect.

[0004] Currently, the method for flaw detection of piston rods is usually to manually inspect the outer surface of the piston rod. After the defect position of the piston rod is found, the defect position is marked so that the defect can be processed later. However, defects are easily missed during the manual flaw detection process, and the accuracy of the flaw detection process is low. The efficiency of manual operation is low, and the loading and unloading of the piston rod requires frequent manual handling, which makes the labor intensity of the operator high. In addition, improper operation is prone to occur during the detection process, resulting in mechanical injuries. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a piston rod flaw detection system and its control method that can automatically detect defects on the outer surface of the piston rod, has high detection efficiency, and can automatically classify the piston rod.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a piston rod flaw detection system, comprising a detection box, an eddy current flaw detection device is provided in the detection box, a loading device is further provided on one side of the detection box, and a discharging device is provided on the other side of the detection box, the eddy current flaw detection device comprises a loading channel arranged in the detection box and matching the position of the loading device, a detection structure arranged on one side of the loading channel and a discharging channel arranged on the other side of the detection structure, the piston rod is inspected in the detection box by the loading device and then moved to the discharging device for discharging, a push plate is further provided on the loading channel, and the push plate is used to push the piston rod from the loading channel to the detection structure.

[0007] The present invention is further configured as follows: the loading device includes a material rack, a feed trough arranged on one side of the material rack, a cleaning structure arranged on the feed trough, and a demagnetization structure arranged on the side of the feed trough close to the detection box body, and a sliding rack is also provided between the feed trough and the material rack.

[0008] Preferably, the cleaning structure includes a bellows arranged on the material rack and fans arranged on both sides of the bellows, and the fans drive the airflow through the bellows to complete the cleaning of the piston rod. The demagnetization structure includes a frame arranged on the material rack and a coil arranged on the frame. The demagnetization structure is also provided with a Hall probe, and the Hall probe is used to detect the residual magnetism of the piston rod.

[0009] The present invention is further configured as follows: the detection structure includes a driving part arranged in the detection box and a detection part arranged above the driving part, the driving part includes a placement bracket and driving rollers arranged at both ends of the placement bracket, the driving part is also provided with a loading buffer rack on the side close to the loading device, and the driving part is also provided with a discharging guide plate on the side close to the discharging device, the detection part includes a sliding frame arranged on the top of the detection box, a mounting plate arranged on the sliding frame, and a detection module arranged on the mounting plate.

[0010] Preferably, a transfer structure is also provided at one end of the detection structure, and the transfer structure includes a driving platform arranged in the detection box and a grabbing assembly arranged on the driving platform, and the grabbing assembly moves between the loading buffer rack, the driving part and the discharge guide plate through the driving platform.

[0011] Preferably, the detection module includes a signal processor disposed on a mounting board and a plurality of probes electrically connected to the signal processor.

[0012] The present invention is further configured as follows: the discharging device includes a discharging trough matched with the discharging channel in the detection box, storage racks arranged on both sides of the discharging trough, and a pushing cylinder arranged on the discharging trough.

[0013] The present invention is further configured as follows: a material baffle plate is further provided on the feeding channel, a pressure detection device is provided on the material baffle plate, and the pressure detection device is used to detect the contact state between the piston rod and the material baffle plate.

[0014] The present application also provides a control method for a piston rod flaw detection system, the control method including pre-processing of the piston rod, comprising the following steps: S11, the device is started, and at the same time, the piston rod in the material rack is moved into the feed trough via the sliding rack and moves along the length direction of the feed trough;

[0015] S12. The bellows on the cleaning structure detects the inside of the bellows. If the bellows detects that the piston rod passes through the bellows, it is determined that the piston rod has passed through the bellows. The fans on both sides of the bellows are started to remove impurities and debris on the surface of the piston rod. After the piston rod leaves the bellows, the fans stop.

[0016] S13. The demagnetization structure detects the material. If it is detected that the piston rod passes through the demagnetization structure, the demagnetization structure establishes a magnetic field to attenuate and demagnetize the piston rod passing through the demagnetization structure. During the demagnetization process, the Hall probe detects the residual magnetism of the piston rod. If the Hall probe detects that the piston rod has residual magnetism, it is determined that the demagnetization effect is not good. The feed chute drives the piston rod to move in the opposite direction and demagnetize the piston rod again. Otherwise, it continues to move. After the piston rod leaves the demagnetization structure, the demagnetization structure is closed.

[0017] Preferably, the control method further includes flaw detection, including the following steps: S21, the piston rod moves from the feed trough into the feeding channel, and at the same time, the pressure detection device detects the material baffle plate. If the pressure detected by the pressure detection device is 0, it is determined that the current piston rod is not in contact with the material baffle plate, and the piston rod continues to move. Otherwise, it is determined that the piston rod has reached a specified position in the feeding channel, and S22 is adjusted to continue the detection;

[0018] S23, the push plate pushes the piston rod in the feeding channel to move into the detection structure of the detection box, and jumps to S24 for eddy current flaw detection;

[0019] S24. The driving portion in the detection structure drives the piston rod to rotate along its central axis, and the detection portion moves along the length direction of the sliding frame during the rotation, thereby generating a magnetic field;

[0020] S25. During the detection process, the signal processor of the detection section generates an eddy current path corresponding to the piston rod surface. If the eddy current path is normally and evenly distributed, it is determined that there is no defect on the current piston rod surface and the current piston rod is recorded as a qualified piston rod. Conversely, if the eddy current path is distorted, it is determined that there is a defect on the current piston rod surface and the current piston rod is recorded as an unqualified piston rod.

[0021] S26. After the detection is completed, the detection part is reset, and the piston rod moves to the discharge device through the discharge channel;

[0022] S27. The discharging device performs inspection. If the piston rod is a qualified piston rod without defects, the pushing cylinder pushes the current piston rod to the qualified storage rack on one side. Conversely, if the piston rod is an unqualified piston rod with defects, the pushing cylinder pushes the current piston rod to the unqualified storage rack on the other side to complete the flaw detection of the piston rod.

[0023] By adopting the above technical solution, beneficial effects are achieved: 1. The present application forms a full-process automatic flaw detection of the processed piston rod by providing a loading device, an eddy current flaw detection device and a discharging device. Specifically, the material rack forms a control for automatically loading the piston rod to the feed trough through a sliding rack, and adopts a bellows cleaning and demagnetization structure to complete the treatment and demagnetization of impurities on the surface of the piston rod during the loading process, thereby preventing surface impurities and residual magnetism from interfering with the flaw detection effect. At the same time, the eddy current flaw detection device adopts a rotational drive of the piston rod in the axial direction and a mobile scanning in the length direction of the piston rod to complete the full-surface flaw detection of the piston rod, which can fully detect the surface defects of the piston rod and can accurately divert the push rod to different storage racks based on the results of defect judgment, thereby reducing manual intervention and improving processing efficiency.

[0024] 2. Furthermore, the present application effectively avoids the problems of surface contamination and magnetic interference by providing a cleaning structure and a demagnetization structure. The bellows can detect the passing status of the piston rod and can intelligently control the fans on both sides of the bellows. Generally speaking, the fan is only started after the piston rod is detected, which reduces energy consumption. The fans are arranged on both sides of the bellows to ensure that impurities on the piston rod are removed without dead angles. At the same time, the demagnetization structure detects the demagnetization effect through the Hall probe, and can repeat the demagnetization operation after detecting that the residual magnetism of the piston rod exceeds the standard. The overall processing effect is good. After the impurity removal and demagnetization operations are completed, the accuracy of eddy current path distortion identification is greatly improved, and the accuracy of subsequent flaw detection of the piston rod is improved.

[0025] 3. At the same time, the detection structure of the present application drives the piston rod to rotate by the driving roller, and the probe moves synchronously along the sliding frame, so that the detection path of the probe on the surface of the piston rod is spiral. Furthermore, by adjusting the rotation speed of the driving roller and the moving speed of the probe, the detection path of the probe on the surface of the piston rod is repeated, so that the probe can completely detect the outer surface of the piston rod and cover the piston rod surface without blind spots. If the rotation speed of the piston rod is too slow or the movement speed of the probe is too fast, the detection path of the probe will not be able to cover the piston rod. Conversely, if the rotation speed of the piston rod is too fast, it is easy to cause a decrease in detection accuracy. In the process of loading the piston rod, a material baffle is provided and a pressure detection device is integrated, so that the contact state of the piston rod can be detected in real time. At the same time, the length of the push plate in the loading channel is set to be greater than the length of the piston rod, which prevents the piston rod from shifting during loading.

[0026] 4. Moreover, after the flaw detection is completed, the present application is combined with the discharging device. Specifically, the signal processor can construct an eddy current distribution model. Generally speaking, when the detection coil carrying an alternating current (the probe in the present application) is close to the conductive material (the piston rod in the present application), eddy currents will be induced. Defects on the surface of the piston (such as cracks and pores) will change the distribution and intensity of the eddy currents, thereby causing changes in the impedance or voltage of the coil, and outputting the impedance or voltage as a plane waveform. When there are no defects on the surface of the piston rod, the plane waveform tends to be evenly distributed. When there are defects on the surface of the piston rod, the generated waveform will be distorted and offset. The staff can conveniently obtain the position, size and depth of the defect based on the distortion offset of the waveform. After completing the inspection of the current piston rod, the signal processor sends the inspection result to the discharging device. The discharging device can classify the inspected piston rods into qualified and unqualified storage racks based on the signal provided by the signal processor to prevent the mixing of qualified and unqualified products. At the same time, the unqualified products are stacked in a single row in the unqualified storage rack, and the signal processor can record the unqualified waveform, which is convenient for data traceability when processing the defects of the batch of piston rods in the future. There is no need to inspect the unqualified products again, and the processing effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the specific structure of an embodiment of a piston rod flaw detection system and a control method thereof according to the present invention;

[0028] Figure 2 A schematic diagram of the specific structure of a detection box of an embodiment of a piston rod flaw detection system and a control method thereof according to the present invention;

[0029] Figure 3 This is a flow chart of a control method for pre-processing a piston rod according to an embodiment of a piston rod flaw detection system and a control method thereof of the present invention;

[0030] Figure 4 This is a flow chart of a control method for flaw detection of a piston rod flaw detection system and a control method thereof according to an embodiment of the present invention;

[0031] 1. Inspection box; 2. Eddy current flaw detection device; 21. Loading channel; 22. Inspection structure; 23. Discharging channel; 24. Pushing plate; 3. Loading device; 31. Material rack; 32. Feed chute; 33. Cleaning structure; 331. Bellows; 332. Fan; 34. Demagnetization structure; 341. Frame; 342. Coil; 343. Hall probe; 4. Discharging device; 41. Discharging chute; 42. Storage rack; 43. Pushing cylinder; 5. Driving part; 51. Placement bracket; 52. Driving roller; 53. Loading buffer rack; 54. Discharging guide plate; 6. Inspection part; 61. Sliding rack; 62. Mounting plate; 63. Inspection module; 64. Signal processor; 65. Probe; 7. Transfer structure; 71. Driving platform; 72. Grabbing assembly; 8. Baffle plate. DETAILED DESCRIPTION

[0032] Reference Figures 1 to 4 An embodiment of a piston rod flaw detection system and a control method thereof of the present invention is further described.

[0033] For ease of explanation, spatial relative terms such as "upper", "lower", "left", and "right" are used in the embodiments to illustrate the relationship between one element or feature shown in the figures and another element or feature. It should be understood that, in addition to the orientation shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "above" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0034] Moreover, relational terms such as “first” and “second” are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any actual relationship or order between these components.

[0035] A piston rod flaw detection system includes a detection box 1, in which an eddy current flaw detection device 2 is provided. A loading device 3 is also provided on one side of the detection box 1, and a discharging device 4 is provided on the other side of the detection box 1. The eddy current flaw detection device 2 includes a loading channel 21 arranged in the detection box 1 and matching the position of the loading device 3, a detection structure 22 arranged on one side of the loading channel 21, and a discharging channel 23 arranged on the other side of the detection structure 22. After the piston rod is flaw-detected in the detection box 1 by the loading device 3, it moves to the discharging device 4 for discharging. A push plate 24 is also provided on the loading channel 21, and the push plate 24 is used to push the piston rod from the loading channel 21 into the detection structure 22.

[0036] The loading device 3 includes a material rack 31, a feed trough 32 arranged on one side of the material rack 31, a cleaning structure 33 arranged on the feed trough 32, and a demagnetization structure 34 arranged on the side of the feed trough 32 close to the detection box 1. A sliding rack 61 is also provided between the feed trough 32 and the material rack 31.

[0037] Preferably, the cleaning structure 33 includes a bellows 331 arranged on the material rack 31 and a fan 332 arranged on both sides of the bellows 331. The fan 332 drives the airflow through the bellows 331 to complete the cleaning of the piston rod. The demagnetization structure 34 includes a frame 341 arranged on the material rack 31 and a coil 342 arranged on the frame 341. The demagnetization structure 34 is also provided with a Hall probe 343, and the Hall probe 343 is used to detect the residual magnetism of the piston rod.

[0038] The detection structure 22 includes a driving part 5 arranged in the detection box 1 and a detection part 6 arranged above the driving part 5, the driving part 5 includes a placement bracket 51 and driving rollers 52 arranged at both ends of the placement bracket 51, the driving part 5 is also provided with a loading buffer rack 53 on the side close to the loading device 3, and the driving part 5 is also provided with a discharging guide plate 54 on the side close to the discharging device 4, the detection part 6 includes a sliding frame 61 arranged on the top of the detection box 1, a mounting plate 62 arranged on the sliding frame 61 and a detection module 63 arranged on the mounting plate 62.

[0039] Preferably, a transfer structure 7 is also provided at one end of the detection structure 22, and the transfer structure 7 includes a driving platform 71 arranged in the detection box 1 and a grabbing assembly 72 arranged on the driving platform 71, and the grabbing assembly 72 moves between the loading buffer rack 53, the driving part 5 and the discharge guide plate 54 through the driving platform 71.

[0040] Preferably, the detection module 63 includes a signal processor 64 disposed on the mounting plate 62 and a plurality of probes 65 electrically connected to the signal processor 64 .

[0041] The discharging device 4 includes a discharging chute 41 matched with the discharging channel 23 in the detection box 1 , storage racks 42 arranged on both sides of the discharging chute 41 , and a pushing cylinder 43 arranged on the discharging chute 41 .

[0042] The feeding channel 21 is further provided with a baffle plate 8 , and the baffle plate 8 is provided with a pressure detection device for detecting the contact state between the piston rod and the baffle plate 8 .

[0043] The present application also provides a control method for a piston rod flaw detection system, the control method including pre-processing of the piston rod, comprising the following steps: S11, the device is started, and at the same time, the piston rod in the material rack is moved into the feed trough via the sliding rack and moves along the length direction of the feed trough;

[0044] S12. The bellows on the cleaning structure detects the inside of the bellows. If the bellows detects that the piston rod passes through the bellows, it is determined that the piston rod has passed through the bellows. The fans on both sides of the bellows are started to remove impurities and debris on the surface of the piston rod. After the piston rod leaves the bellows, the fans stop.

[0045] S13. The demagnetization structure detects the material. If it is detected that the piston rod passes through the demagnetization structure, the demagnetization structure establishes a magnetic field to attenuate and demagnetize the piston rod passing through the demagnetization structure. During the demagnetization process, the Hall probe detects the residual magnetism of the piston rod. If the Hall probe detects that the piston rod has residual magnetism, it is determined that the demagnetization effect is not good. The feed chute drives the piston rod to move in the opposite direction and demagnetize the piston rod again. Otherwise, it continues to move. After the piston rod leaves the demagnetization structure, the demagnetization structure is closed.

[0046] Preferably, the control method further includes flaw detection, including the following steps: S21, the piston rod moves from the feed trough into the feeding channel, and at the same time, the pressure detection device detects the material baffle plate. If the pressure detected by the pressure detection device is 0, it is determined that the current piston rod is not in contact with the material baffle plate, and the piston rod continues to move. Otherwise, it is determined that the piston rod has reached a specified position in the feeding channel, and S22 is adjusted to continue the detection;

[0047] S23, the push plate pushes the piston rod in the feeding channel to move into the detection structure of the detection box, and jumps to S24 for eddy current flaw detection;

[0048] S24. The driving portion in the detection structure drives the piston rod to rotate along its central axis, and the detection portion moves along the length direction of the sliding frame during the rotation, thereby generating a magnetic field;

[0049] S25. During the detection process, the signal processor of the detection section generates an eddy current path corresponding to the piston rod surface. If the eddy current path is normally and evenly distributed, it is determined that there is no defect on the current piston rod surface and the current piston rod is recorded as a qualified piston rod. Conversely, if the eddy current path is distorted, it is determined that there is a defect on the current piston rod surface and the current piston rod is recorded as an unqualified piston rod.

[0050] S26. After the detection is completed, the detection part is reset, and the piston rod moves to the discharge device through the discharge channel;

[0051] S27. The discharging device performs inspection. If the piston rod is a qualified piston rod without defects, the pushing cylinder pushes the current piston rod to the qualified storage rack on one side. Conversely, if the piston rod is an unqualified piston rod with defects, the pushing cylinder pushes the current piston rod to the unqualified storage rack on the other side to complete the flaw detection of the piston rod.

[0052] The present application forms a full-process automatic flaw detection of the processed piston rod by providing a loading device 3, an eddy current flaw detection device 2 and a discharging device 4. Specifically, the material rack 31 controls the automatic loading of the piston rod to the feed trough 32 through the sliding rack 61, and uses the bellows 331 to clean and the demagnetization structure 34 to complete the treatment and demagnetization of impurities on the surface of the piston rod during the loading process, thereby preventing surface impurities and residual magnetism from interfering with the flaw detection effect. At the same time, the eddy current flaw detection device 2 uses the axial rotation drive of the piston rod and the moving scanning in the length direction of the piston rod to complete the full-surface flaw detection of the piston rod, which can fully detect the surface defects of the piston rod and can accurately divert the push rod to different storage racks based on the results of the defect judgment, thereby reducing manual intervention and improving processing efficiency.

[0053] Furthermore, the present application effectively avoids the problems of surface contamination and magnetic interference by providing a cleaning structure 33 and a demagnetization structure 34. The bellows 331 can detect the passing state of the piston rod and can intelligently control the fans 332 on both sides of the bellows 331. Generally speaking, the fans 332 are only started after the piston rod is detected, which reduces energy consumption. The fans 332 are arranged on both sides of the bellows 331 to ensure that impurities on the piston rod are removed without dead angles. At the same time, the demagnetization structure 34 detects the demagnetization effect through the Hall probe 343, and can repeat the demagnetization operation after detecting that the residual magnetism of the piston rod exceeds the standard. The overall processing effect is good. After the impurity removal and demagnetization operations are completed, the accuracy of eddy current path distortion identification is greatly improved, and the accuracy of subsequent flaw detection of the piston rod is improved.

[0054] At the same time, the detection structure 22 of the present application drives the piston rod to rotate by the driving roller 52, and the probe 65 moves synchronously along the sliding frame 61, so that the detection path of the probe 65 on the surface of the piston rod is spiral. Furthermore, by adjusting the rotation speed of the driving roller 52 and the movement speed of the probe 65, the detection path of the probe 65 on the surface of the piston rod is repeated, so that the probe 65 can completely detect the outer surface of the piston rod and cover the piston rod surface without blind spots. If the rotation speed of the piston rod is too slow or the movement speed of the probe 65 is too fast, the detection path of the probe 65 will not be able to cover the piston rod. Conversely, if the rotation speed of the piston rod is too fast, it is easy to cause a decrease in detection accuracy. In the process of loading the piston rod, by providing a baffle plate 8 and integrating a pressure detection device, the contact state of the piston rod can be detected in real time. At the same time, the length of the push plate 24 in the loading channel 21 is set to be greater than the length of the piston rod, which prevents the piston rod from being offset during loading.

[0055] Moreover, after the flaw detection is completed, the present application is combined with the discharge device 4. Specifically, the signal processor 64 can construct an eddy current distribution model. Generally speaking, when the detection coil 342 (probe 65 in the present application) carrying an alternating current is close to a conductive material (piston rod in the present application), eddy currents will be induced. Defects on the surface of the piston (such as cracks and pores) will change the distribution and intensity of the eddy currents, thereby causing changes in the impedance or voltage of the coil 342, and outputting the impedance or voltage as a plane waveform. When there are no defects on the surface of the piston rod, the plane waveform tends to be evenly distributed. When there are defects on the surface of the piston rod, the generated waveform will be distorted and offset. The operator can conveniently obtain the position, size and depth of the defect according to the distortion offset of the waveform. After the inspection of the current piston rod is completed, the signal processor 64 sends the inspection result to the discharging device 4. The discharging device 4 can classify the inspected piston rods into qualified and unqualified storage racks 42 based on the signal provided by the signal processor 64 to prevent the mixing of qualified and unqualified products. At the same time, the unqualified products are stacked in a single row in the unqualified storage rack 42, and the signal processor 64 can record the unqualified waveform, which is convenient for data traceability when the defects of the batch of piston rods are subsequently processed. There is no need to inspect the unqualified products again, and the processing effect is good.

[0056] When classifying the piston rods, the pushing cylinder 43 of the discharging device 4 is configured as a rotating rod that can rotate clockwise and counterclockwise and a plurality of blades arranged on the rotating rod, and the rotation trajectory of the blades can conflict with the piston rod in the feeding channel 21. When the rotating rod stops, the blades can prevent the piston rod from moving to either side of the storage rack 42. When the qualified state of the piston rod is detected, the rotating rod is driven to rotate clockwise / counterclockwise based on the qualified / unqualified state of the piston rod, so that the blades conflict with the piston rod to complete the discharging.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A piston rod flaw detection system, comprising a detection box (1), characterized in that: An eddy current flaw detection device (2) is provided in the detection box (1), a feeding device (3) is provided on one side of the detection box (1), and a discharging device (4) is provided on the other side of the detection box (1). The eddy current flaw detection device (2) includes a feeding channel (21) provided in the detection box (1) and matching the position of the feeding device (3), a detection structure (22) provided on one side of the feeding channel (21), and a discharging channel (23) provided on the other side of the detection structure (22). After the piston rod is subjected to flaw detection in the detection box (1) by the feeding device (3), it moves to the discharging device (4) for discharging. A pushing plate (24) is also provided on the feeding channel (21), and the pushing plate (24) is used to push the piston rod from the feeding channel (21) into the detection structure (22).

2. A piston rod flaw detection system according to claim 1, characterized in that: The loading device (3) comprises a material rack (31), a feeding trough (32) arranged on one side of the material rack (31), a cleaning structure (33) arranged on the feeding trough (32), and a demagnetization structure (34) arranged on the side of the feeding trough (32) close to the detection box (1). A sliding rack (61) is also provided between the feeding trough (32) and the material rack (31).

3. A piston rod flaw detection system according to claim 2, characterized in that: The cleaning structure (33) includes a bellows (331) arranged on the material rack (31) and fans (332) arranged on both sides of the bellows (331). The fans (332) drive the airflow through the bellows (331) to complete the cleaning of the piston rod. The demagnetization structure (34) includes a frame (341) arranged on the material rack (31) and a coil (342) arranged on the frame (341). The demagnetization structure (34) is also provided with a Hall probe (343). The Hall probe (343) is used to detect the residual magnetism of the piston rod.

4. The piston rod flaw detection system according to claim 1, characterized in that: The detection structure (22) comprises a driving part (5) arranged in the detection box (1) and a detection part (6) arranged above the driving part (5); the driving part (5) comprises a placement bracket (51) and driving rollers (52) arranged at both ends of the placement bracket (51); a loading buffer rack (53) is further provided on the side of the driving part (5) close to the loading device (3); a discharging guide plate (54) is further provided on the side of the driving part (5) close to the discharging device (4); the detection part (6) comprises a sliding rack (61) arranged on the top of the detection box (1), a mounting plate (62) arranged on the sliding rack (61), and a detection module (63) arranged on the mounting plate (62).

5. The piston rod flaw detection system according to claim 4, characterized in that: A transfer structure (7) is further provided at one end of the detection structure (22). The transfer structure (7) comprises a driving platform (71) arranged in the detection box (1) and a grabbing assembly (72) arranged on the driving platform (71). The grabbing assembly (72) moves between the loading buffer rack (53), the driving part (5) and the discharge guide plate (54) through the driving platform (71).

6. The piston rod flaw detection system according to claim 4, characterized in that: The detection module (63) includes a signal processor (64) arranged on a mounting plate (62) and a plurality of probes (65) electrically connected to the signal processor (64).

7. The piston rod flaw detection system according to claim 1, characterized in that: The discharging device (4) comprises a discharging trough (41) matched with the discharging channel (23) in the detection box (1), storage racks (42) arranged on both sides of the discharging trough (41), and a pushing cylinder (43) arranged on the discharging trough (41).

8. The piston rod flaw detection system according to claim 1, characterized in that: The feeding channel (21) is further provided with a material blocking plate (8), and the material blocking plate (8) is provided with a pressure detection device, and the pressure detection device is used to detect the contact state between the piston rod and the material blocking plate (8).

9. A control method for the piston rod flaw detection system according to any one of claims 1 to 8, characterized in that: The control method includes pre-processing of the piston rod, comprising the following steps: S11, the device starts, and at the same time the piston rod in the material rack moves into the feed trough through the sliding rack and moves along the length direction of the feed trough; S12. The bellows on the cleaning structure detects the inside of the bellows. If the bellows detects that the piston rod passes through the bellows, it is determined that the piston rod has passed through the bellows. The fans on both sides of the bellows are started to remove impurities and debris on the surface of the piston rod. After the piston rod leaves the bellows, the fans stop. S13. The demagnetization structure detects the material. If it is detected that the piston rod passes through the demagnetization structure, the demagnetization structure establishes a magnetic field to attenuate and demagnetize the piston rod passing through the demagnetization structure. During the demagnetization process, the Hall probe detects the residual magnetism of the piston rod. If the Hall probe detects that the piston rod has residual magnetism, it is determined that the demagnetization effect is not good. The feed chute drives the piston rod to move in the opposite direction and demagnetize the piston rod again. Otherwise, it continues to move. After the piston rod leaves the demagnetization structure, the demagnetization structure is closed.

10. The control method of a piston rod flaw detection system according to claim 9, characterized in that: The control method further includes flaw detection, including the following steps: S21, the piston rod moves from the feed trough into the feeding channel, and at the same time, the pressure detection device detects the material baffle plate. If the pressure detected by the pressure detection device is 0, it is determined that the current piston rod is not in contact with the material baffle plate, and the piston rod continues to move. Otherwise, it is determined that the piston rod has reached a specified position in the feeding channel, and S22 is adjusted to continue the detection; S23, the push plate pushes the piston rod in the feeding channel to move into the detection structure of the detection box, and jumps to S24 for eddy current flaw detection; S24. The driving portion in the detection structure drives the piston rod to rotate along its central axis, and the detection portion moves along the length direction of the sliding frame during the rotation, thereby generating a magnetic field; S25. During the detection process, the signal processor of the detection section generates an eddy current path corresponding to the piston rod surface. If the eddy current path is normally and evenly distributed, it is determined that there is no defect on the current piston rod surface and the current piston rod is recorded as a qualified piston rod. Conversely, if the eddy current path is distorted, it is determined that there is a defect on the current piston rod surface and the current piston rod is recorded as an unqualified piston rod. S26. After the detection is completed, the detection part is reset, and the piston rod moves to the discharge device through the discharge channel; S27. The discharging device performs inspection. If the piston rod is a qualified piston rod without defects, the pushing cylinder pushes the current piston rod to the qualified storage rack on one side. Conversely, if the piston rod is an unqualified piston rod with defects, the pushing cylinder pushes the current piston rod to the unqualified storage rack on the other side to complete the flaw detection of the piston rod.

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