Flaw detection equipment and method based on nodular cast iron pipe production

Abstract

The invention discloses flaw detection equipment and method based on nodular cast iron pipe production, and relates to the technical field of nodular cast iron pipe detection. The nodular cast iron pipe detection device comprises a nodular cast iron pipe arranged on a detection platform, and further comprises a positioning unit arranged on a first machining box and comprising a driving assembly and a positioning assembly; and the flaw detection unit is arranged on the detection platform and comprises a synchronization assembly and a detection assembly, and a first machining box and a second machining box are arranged on the detection platform. The device has the advantages that synchronous visual flaw detection of the inner wall and the outer wall of the nodular cast iron pipe can be realized on the premise of not changing the positioning state of the nodular cast iron pipe, comprehensive detection of the inner wall and the outer wall of the nodular cast iron pipe can be realized, and the collision knocking rod can be driven to automatically knock the nodular cast iron pipe in a clearance manner to generate vibration waves during visual detection; meanwhile, vibration waves are collected and detected in cooperation with a ripple detector, internal flaw detection of the nodular cast iron pipe can be achieved, and the detection range is wider.

Description

Technical Field

[0001] The invention relates to the technical field of ductile iron pipe detection, and in particular to a flaw detection device and method based on ductile iron pipe production. Background Art

[0002] Ductile iron pipe is an alloy pipe with cast iron as the main body and iron, carbon, graphite and other materials as support. The graphite in the ductile iron pipe is in spherical form. Generally, the size of graphite is 6-7. It has the nature of iron and the performance of steel. Therefore, the ductile iron pipe has good mechanical properties. After the processing of ductile iron pipe is completed, it is usually inspected by flaw detection equipment.

[0003] Existing flaw detection equipment uses a variety of methods to achieve flaw detection of steel pipes, such as a steel pipe flaw detection auxiliary device with publication number CN118533976A, which relates to the field of steel pipe detection technology, including: a transmission frame, with drive frames installed on both sides, and retaining frames installed on both sides of the transmission frame, first stroke cylinders installed on both sides of the transmission frame, and support rollers installed on both sides of the bottom end of the transmission frame; a reinforcement component installed at the bottom end of the transmission frame, and the reinforcement component is arranged between two groups of support rollers; a connecting frame, with both ends of which are respectively connected to a group of drive frames, and after the steel pipe to be detected enters the transmission frame, the connecting frame moves at the same speed as the steel pipe through two groups of drive frames; When the existing detection equipment is detecting, the detection module inside it is usually fitted with the outer wall of the steel pipe, and the steel pipe is driven to move horizontally to adjust the relative position of the detection module, and the steel pipe is detected by the detection module. This detection method cannot perform flaw detection on the inner wall of the steel pipe. At the same time, the angle position of the steel pipe cannot be adjusted during detection, and the detection range is effective. For example, the above-mentioned referenced prior art uses a drive frame to drive the detection module to make it move synchronously with the steel pipe, and adjusts the probe part through the travel frame to make it fit with the outer wall of the steel pipe for detection. This detection method can only detect specific positions on the outer wall of the steel pipe, and can neither realize the detection of the inner wall of the steel pipe nor the comprehensive detection of the steel pipe. The relative position of the steel pipe and the detection module cannot be adjusted during detection, and external knocking is also required to generate vibration waves for auxiliary detection, and the detection efficiency is low; Therefore, it is urgent to design a flaw detection equipment and method based on ductile iron pipe production to solve the above problems. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a flaw detection device and method based on the production of ductile iron pipes, which solves the problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a flaw detection device based on the production of ductile iron pipes, including a ductile iron pipe to be detected arranged on a detection platform, and also including: The erection unit is arranged on the upper part of the detection platform and is used to realize the preliminary placement and erection of the ductile iron pipe. The detection platform is provided with a processing box 1 and a processing box 2; The positioning unit is arranged on the processing box 1, and includes a driving component and a positioning component, wherein a plurality of rubber arc plates are arranged in the positioning component, and the plurality of rubber arc plates realize the extrusion positioning of the ductile iron pipe under the drive of the positioning component, and the driving component cooperates with the positioning component to realize the positioning, steering and angle adjustment of the ductile iron pipe; The flaw detection unit is arranged on the detection platform, and includes a synchronization component and a detection component. The detection component is provided with a corrugation detector and a collision knocking rod for knocking the ductile iron pipe. The synchronization component cooperates with the driving component to realize the position movement of the detection component, so as to adjust the relative position of the corrugation detector and the ductile iron pipe to realize comprehensive flaw detection.

[0006] Preferably, the flaw detection equipment further comprises an equipment box, which is arranged at the lower part of the detection platform and is used to support the detection platform to improve the detection stability; The detection platform is provided with a control console and a display platform, and the control console is used to control the opening and closing and operation status of the positioning unit and the flaw detection unit, so as to realize accurate automatic flaw detection of the ductile iron pipe.

[0007] Preferably, the mounting unit includes two support frames fixedly mounted on the detection platform, both support frames are fixedly mounted with limit rings, and the ductile iron pipe is located on the inner sides of the two limit rings, a center frame is fixedly mounted on the detection platform, and a plurality of auxiliary rollers cooperating with the ductile iron pipe are rotatably mounted on the center frame.

[0008] Preferably, the driving assembly includes a servo motor fixedly mounted in a processing box, and a driving roller is rotatably mounted between the driving end of the servo motor and the processing box, a steering wheel is fixedly mounted on the driving roller, and the positioning assembly is arranged on the steering wheel.

[0009] Preferably, the positioning assembly includes a plurality of electric telescopic rods fixedly mounted on the steering wheel, and a rubber arc plate for squeezing the inner wall of the ductile iron pipe is fixedly mounted on the driving end of each electric telescopic rod, and each of the rubber arc plates is provided with a plurality of friction transverse grooves for increasing friction resistance.

[0010] Preferably, the synchronization component includes a linkage roller rotatably mounted between processing box one and processing box two, a driving wheel is fixedly mounted on the driving roller, a driven wheel is fixedly mounted on the linkage roller, and a transmission belt is sleeved between the driving wheel and the driven wheel.

[0011] Preferably, the detection assembly includes a limit box fixedly mounted on the detection platform, a threaded displacement rod fixedly mounted on the linkage roller, and the threaded displacement rod is located in the limit box, a driven nut is slidably mounted in the limit box through a sliding member, and the driven nut is threadably matched with the threaded displacement rod, an external flaw detection mechanism is arranged on the driven nut, and an internal flaw detection mechanism is arranged on the processing box 2.

[0012] Preferably, the external flaw detection mechanism includes an external movable plate fixedly mounted on the driven nut, an external electromagnetic plate in contact with the outer wall of the ductile iron pipe is fixedly mounted on the external movable plate, a plurality of external cameras for detecting damage to the outer wall of the ductile iron pipe are fixedly mounted on the external movable plate, and a corrugation detector for detecting internal damage to the ductile iron pipe is provided on the external movable plate.

[0013] Preferably, the internal flaw detection mechanism comprises an elastic telescopic rod fixedly mounted on the processing box 2, and a built-in movable plate is fixedly mounted on the elastic telescopic rod, and a built-in electromagnetic plate that fits the inner wall of the ductile iron pipe is fixedly mounted on the built-in movable plate, and the built-in electromagnetic plate cooperates with the external electromagnetic plate; A driven rotating rod is rotatably mounted on the built-in movable plate, a reset spring with an automatic reset function is provided on the driven rotating rod, a collision knocking rod for knocking the ductile iron pipe is fixedly mounted on the reset spring, and a friction roller matching the inner wall of the ductile iron pipe is fixedly mounted on the driven rotating rod.

[0014] A flaw detection method based on the production of ductile iron pipes, used for the above-mentioned flaw detection equipment based on the production of ductile iron pipes, comprises the following steps: S1. Preliminary positioning of the ductile iron pipe is performed by means of the erection unit, and then the positioning assembly drives multiple rubber arc plates to move, thereby performing internal extrusion positioning of the ductile iron pipe; S2, starting the driving assembly to drive the ductile iron pipe to rotate in cooperation with the positioning assembly; S3, the driving component starts to drive the detection component to move in cooperation with the synchronization component, and adjusts the relative position of the corrugation detector in the detection component and the ductile iron pipe; S4. While the detection component is moving, the inner and outer walls of the ductile iron pipe are visually inspected. At the same time, the impact knocking rod intermittently knocks the ductile iron pipe to generate vibration waves, and the sound prints are synchronously detected through the ripple detector.

[0015] The present invention provides a flaw detection device and method based on the production of ductile iron pipes. It has the following beneficial effects: 1. When the flaw detection equipment is used for flaw detection of ductile iron pipes, the inner wall of the ductile iron pipe can be tightly squeezed and fitted through the cooperation of the electric telescopic rod and multiple rubber arc plates, so as to realize the stable positioning of the ductile iron pipe. At the same time, the overall steering of the ductile iron pipe can be realized by cooperating with the servo motor, and the steering will not affect the positioning effect, so the detection efficiency is higher.

[0016] 2. When this flaw detection equipment is used to detect ductile iron pipes, the relative positions of the external camera, the internal camera, the corrugation detector and the ductile iron pipe on the detection component can be flexibly adjusted through the cooperation of the synchronization component and the drive component, so as to realize synchronous flaw detection of the inner and outer walls of the ductile iron pipe, with a wider detection range and higher detection efficiency.

[0017] 3. When this flaw detection equipment is used for flaw detection of ductile iron pipes, the cooperation of the external electromagnetic plate and the internal electromagnetic plate can realize the synchronous movement of multiple internal and external cameras, and the visual flaw detection of the inner and outer walls of the ductile iron pipe can be carried out at the same time in conjunction with the rotation of the ductile iron pipe, with higher detection accuracy and no omissions.

[0018] 4. When the flaw detection equipment is used for flaw detection of ductile iron pipes, the built-in moving plate can be moved for detection, and the rotation of the ductile iron pipe can be used to drive the collision knocking rod to continuously flip and knock the inner wall of the ductile iron pipe, thereby automatically generating vibration waves in the ductile iron pipe. At the same time, the vibration waves can be collected and detected in conjunction with an external corrugation detector. The internal damage of the ductile iron pipe can be intuitively detected through the change of the waveform, and the detection efficiency is higher.

[0019] To sum up, the present invention can realize synchronous visual flaw detection of the inner and outer walls of the ductile iron pipe without changing the positioning state of the ductile iron pipe, and can realize comprehensive detection of the inner and outer walls of the ductile iron pipe. At the same time of visual detection, the collision knocking rod can be driven to automatically knock on the ductile iron pipe intermittently to generate vibration waves, and at the same time, the corrugation detector can be used to collect and detect the vibration waves, thereby realizing internal flaw detection of the ductile iron pipe, and the detection range is wider.

[0020] Other features and advantages of the present invention will be described in the following description, and part of them will become obvious from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings, wherein: Figure 1 This is a structural schematic diagram of a flaw detection device based on ductile iron pipe production proposed by the present invention; Figure 2for Figure 1 Schematic diagram of the structure after rotating a certain angle; Figure 3 for Figure 1 Schematic diagram of the upper structure of the middle detection platform; Figure 4 for Figure 3 Schematic diagram of the structure after rotating a certain angle; Figure 5 for Figure 4 Schematic diagram of the internal structure of the middle processing box one; Figure 6 for Figure 5 Schematic diagram of the structure after removing the ductile iron pipe; Figure 7 for Figure 6 Schematic diagram of the structure of the servo motor and the limit box; Figure 8 for Figure 7 Schematic diagram of the structure of the servo motor and the steering wheel; Fig. 9 It is a structural schematic diagram of the flaw detection unit in the present invention; Fig.10 for Fig. 9 Structural diagram of the external mobile board and the internal mobile board; Fig.11 for Fig.10 Schematic diagram of structural decomposition; Fig.12 for Fig.10 Structural diagram of the external moving plate and driven nut; Fig.13 for Fig.10 A schematic diagram of the structure of the built-in moving plate; Fig.14 for Fig.13 Schematic diagram of the structure after the built-in moving plate is rotated to a certain angle.

[0022] In the figure: 1 equipment box, 2 control console, 3 processing box one, 4 ductile iron pipe, 5 limit ring, 6 auxiliary roller, 7 processing box two, 8 detection platform, 9 servo motor, 10 limit box, 11 thread displacement rod, 12 steering wheel, 13 rubber arc plate, 14 driving roller, 15 electric telescopic rod, 16 linkage roller, 17 transmission belt, 18 driven wheel, 19 elastic telescopic rod, 20 external moving plate, 21 driven nut, 22 internal moving plate, 23 corrugation detector, 24 external electromagnetic plate, 25 internal electromagnetic plate, 26 friction roller, 27 external camera, 28 reset spring, 29 collision knocking rod, 30 internal camera, 31 driving wheel, 32 support frame, 33 driven rotating rod, 34 friction cross groove, 35 external scraper. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] Example 1: Reference Figure 1-Figure 4 A flaw detection and testing equipment based on the production of ductile iron pipes includes a ductile iron pipe 4 to be tested which is arranged on a testing platform 8. The ductile iron pipe 4 is the pipe body to be tested. The flaw detection and testing equipment is used to perform synchronous flaw detection on the outer and inner walls and the interior.

[0025] The flaw detection equipment also includes: The erection unit is arranged on the upper part of the detection platform 8, and is used to realize the preliminary placement and erection of the ductile iron pipe 4. The preliminary positioning of the ductile iron pipe 4 is realized by the erection unit, and its placement stability is improved; A processing box 1 3 and a processing box 2 7 are arranged on the detection platform 8, and the processing box 1 3 and the processing box 2 7 play a supporting and placing role, thereby improving the stability of the flaw detection process.

[0026] The positioning unit is arranged on the processing box 3, and is used to realize the internal positioning of the ductile iron pipe 4, and realize its rotation without affecting the positioning state of the ductile iron pipe 4, so as to improve the detection range of the ductile iron pipe 4.

[0027] The flaw detection unit is arranged on the detection platform 8. The flaw detection unit is used to realize the visual detection of the flaws on the inner and outer walls of the ductile iron pipe 4. At the same time, the inside of the ductile iron pipe 4 is detected by knocking to generate vibration waves, and the density of the inside of the ductile iron pipe 4 is detected to determine whether there are cracks inside the ductile iron pipe 4.

[0028] Example 2: Reference Figure 2-Figure 6 , the difference between this embodiment and the first embodiment is that: the flaw detection equipment also includes an equipment box 1, which is arranged at the lower part of the detection platform 8 and is used to support the detection platform 8 to improve the detection stability; The detection platform 8 is provided with a control console 2 and a display platform. The control console 2 is used to control the opening and closing and operation status of the positioning unit and the flaw detection unit, so as to realize accurate automatic flaw detection of the ductile iron pipe 4; The display platform is used to display and record the test results of the positioning unit and the flaw detection unit, so that the test results can be observed, recorded and judged intuitively.

[0029] In a further embodiment, the erection unit includes two support frames 32 fixedly mounted on the detection platform 8, and the two support frames 32 are fixedly mounted with limit rings 5, and the ductile iron pipe 4 is located inside the two limit rings 5, and the two limit rings 5 ​​are used to perform preliminary erection positioning on the ductile iron pipe 4 to ensure that the ductile iron pipe 4 will not deviate; A middle frame is fixedly installed on the detection platform 8, and a plurality of auxiliary rollers 6 cooperating with the ductile iron pipe 4 are rotatably installed on the middle frame. The auxiliary rollers 6 are used to support the ductile iron pipe 4. At the same time, the rotatable auxiliary rollers 6 can assist the rotation of the ductile iron pipe 4 and improve the rotation stability of the ductile iron pipe 4. When testing the ductile iron pipe 4, the ductile iron pipe 4 is first placed on a plurality of auxiliary rollers 6, and both ends of the ductile iron pipe 4 are respectively located inside two limit rings 5, so that the preliminary placement and positioning of the ductile iron pipe 4 can be completed.

[0030] Example 3: Reference Figure 4-Figure 8 The technical solution of this embodiment is different from that of the second embodiment in that: the positioning unit includes a driving component and a positioning component, wherein a plurality of rubber arc plates 13 are arranged in the positioning component, and the plurality of rubber arc plates 13 realize the extrusion positioning of the ductile iron pipe 4 under the drive of the positioning component, and the driving component cooperates with the positioning component to realize the positioning, steering and angle adjustment of the ductile iron pipe 4; The driving assembly includes a servo motor 9 fixedly installed in the processing box 3, and a driving roller 14 is rotatably installed between the driving end of the servo motor 9 and the processing box 3, and a steering wheel 12 is fixedly installed on the driving roller 14; When the servo motor 9 is started, the driving roller 14 on the driving end thereof will be driven to rotate, and the rotation of the driving roller 14 will drive the steering wheel 12 to rotate synchronously.

[0031] In a further embodiment, the positioning assembly is disposed on the steering wheel 12, and the positioning assembly includes a plurality of electric telescopic rods 15 fixedly mounted on the steering wheel 12, and a rubber arc plate 13 for squeezing the inner wall of the ductile iron pipe 4 is fixedly mounted on the driving end of each electric telescopic rod 15; After the ductile iron pipe 4 is initially placed, the plurality of rubber arc plates 13 will be inside the ductile iron pipe 4. At this time, the plurality of electric telescopic rods 15 are synchronously started to drive the plurality of rubber arc plates 13 to move synchronously with the same stroke, so that the plurality of rubber arc plates 13 are synchronously fitted with the inner wall of the ductile iron pipe 4. The rubber arc plates 13 are pushed again to pressurize the inner wall of the ductile iron pipe 4. At this time, the ductile iron pipe 4 will be firmly clamped between the plurality of rubber arc plates 13, that is, the internal extrusion fixation of the ductile iron pipe 4 is achieved by the plurality of rubber arc plates 13. After the internal extrusion and fixation of the ductile iron pipe 4 is completed, when the servo motor 9 is started, it will drive the driving roller 14 to rotate, and the driving roller 14 will drive the steering wheel 12 to rotate, and then through the cooperation of the steering wheel 12 with multiple electric telescopic rods 15 and multiple rubber arc plates 13, the rotation of the ductile iron pipe 4 can be directly driven, and the automatic rotation of the ductile iron pipe 4 can be achieved without changing the positioning state of the ductile iron pipe 4.

[0032] Each rubber arc plate 13 is provided with a plurality of friction transverse grooves 34 for increasing friction resistance. The friction transverse grooves 34 can increase the contact area between the rubber arc plate 13 and the inner wall of the ductile iron pipe 4, thereby increasing the friction resistance between the rubber arc plate 13 and the ductile iron pipe 4 when the rubber arc plate 13 squeezes the inner wall of the ductile iron pipe 4, thereby improving the stability of the extrusion positioning inside the ductile iron pipe 4.

[0033] Example 4: Reference Figure 5-Figure 7 as well as Figure 9-Figure 14 The difference between this embodiment and the third embodiment is that the flaw detection unit includes a synchronization component and a detection component, the detection component is provided with a corrugation detector 23 and a collision knocking rod 29 for knocking the ductile iron pipe 4, the synchronization component cooperates with the driving component to realize the position movement of the detection component, thereby adjusting the relative position of the corrugation detector 23 and the ductile iron pipe 4 to realize comprehensive flaw detection; The synchronization component includes a linkage roller 16 rotatably mounted between the processing box 1 3 and the processing box 2 7, a driving wheel 31 is fixedly mounted on the driving roller 14, a driven wheel 18 is fixedly mounted on the linkage roller 16, and a transmission belt 17 is sleeved between the driving wheel 31 and the driven wheel 18; When the servo motor 9 drives the driving roller 14 to rotate, the driving roller 14 will drive the driving wheel 31 thereon to rotate. When the driving wheel 31 rotates, it will drive the driven wheel 18 to rotate with the cooperation of the transmission belt 17. The driven wheel 18 will drive the linkage roller 16 to rotate, so that the servo motor 9 can synchronously drive the driving roller 14 and the linkage roller 16 to rotate when it is started. Attached to the instruction manual Fig. 9 It can be seen that the driving wheel 31 and the driven wheel 18 rotate in coordination through the transmission belt 17, that is, the linear speeds of the two are the same, and because the outer diameter of the driving wheel 31 is much smaller than the outer diameter of the driven wheel 18, that is, the angular velocities of the driving wheel 31 and the driven wheel 18 are different, that is, the rotation speed of the driving wheel 31 is greater than the rotation speed of the driven wheel 18, that is, when the driven wheel 18 rotates one circle, the driving wheel 31 will rotate multiple circles.

[0034] In a further embodiment, the detection assembly includes a limit box 10 fixedly mounted on the detection platform 8, a threaded displacement rod 11 is fixedly mounted on the linkage roller 16, and the threaded displacement rod 11 is located in the limit box 10, a driven nut 21 is slidably mounted in the limit box 10 through a sliding member, and the driven nut 21 is threadably matched with the threaded displacement rod 11; When the linkage roller 16 rotates, it will drive the threaded displacement rod 11 thereon to rotate, and because the driven nut 21 is threadedly matched with the threaded displacement rod 11, and the driven nut 21 can only slide in the limit box 10 under the limitation of the sliding member, when the threaded displacement rod 11 rotates, it will drive the driven nut 21 to move horizontally in the limit box 10 without rotating.

[0035] An external flaw detection mechanism is provided on the driven nut 21, and the external flaw detection mechanism includes an external movable plate 20 fixedly mounted on the driven nut 21, an external electromagnetic plate 24 that fits the outer wall of the ductile iron pipe 4 is fixedly mounted on the external movable plate 20, and a plurality of external cameras 27 for detecting damage to the outer wall of the ductile iron pipe 4 are fixedly mounted on the external movable plate 20; When the driven nut 21 moves horizontally, it will drive the external moving plate 20 thereon to move horizontally, thereby driving the external electromagnetic plate 24 thereon to slide horizontally on the outer wall of the ductile iron pipe 4; When performing external inspection, the servo motor 9 starts to drive the ductile iron pipe 4 to rotate with the cooperation of the positioning assembly, and at the same time drives the threaded displacement rod 11 to rotate, and the external movable plate 20 can be driven to move horizontally through the driven nut 21. At this time, the multiple external cameras 27 on the external movable plate 20 will start to perform video inspection on the outside of the ductile iron pipe 4, so as to realize the visual inspection of the outside of the ductile iron pipe 4; When the external camera 27 moves for video inspection, the ductile iron pipe 4 will rotate synchronously, and the rotation speed of the ductile iron pipe 4 is greater than the moving speed of the external camera 27, that is, the external camera 27 will move a unit distance when the ductile iron pipe 4 rotates multiple times, and the moving distance of the external camera 27 will not exceed its video range, so that the outer wall of the ductile iron pipe 4 can be fully video-detected without blind spots in the flaw detection. For example, the detection range of the external camera 27 is three unit distances. The external camera 27 moves one unit distance every time the ductile iron pipe 4 rotates one circle. It can be seen that the part will be out of the detection range of the external camera 27 only when the ductile iron pipe 4 rotates three circles. Therefore, a comprehensive detection of the outer wall of the ductile iron pipe 4 can be achieved.

[0036] In a further embodiment, an internal flaw detection mechanism is provided on the processing box 2 7, and the internal flaw detection mechanism includes an elastic telescopic rod 19 fixedly mounted on the processing box 2 7, and a built-in movable plate 22 is fixedly mounted on the elastic telescopic rod 19, and a built-in electromagnetic plate 25 that fits the inner wall of the ductile iron pipe 4 is fixedly mounted on the built-in movable plate 22, and the built-in electromagnetic plate 25 cooperates with the external electromagnetic plate 24; After the ductile iron pipe 4 is positioned, the built-in movable plate 22 will be located inside the ductile iron pipe 4 , and at this time, the built-in electromagnetic plate 25 on the built-in movable plate 22 fits with the inner wall of the ductile iron pipe 4 .

[0037] When the external moving plate 20 moves and drives the external electromagnetic plate 24 to move, the external electromagnetic plate 24 and the internal electromagnetic plate 25 are synchronously started so that the two are attracted to each other through the ductile iron pipe 4. At this time, when the external electromagnetic plate 24 moves, it will synchronously drive the internal electromagnetic plate 25 to move under the action of the suction force, thereby driving the internal moving plate 22 to move synchronously; When the built-in movable plate 22 moves, the multiple built-in cameras 30 thereon will start to carry out video inspection of the inner wall of the ductile iron pipe 4. During the inspection, the ductile iron pipe 4 rotates synchronously. Its video inspection range is the same as that of the above-mentioned external camera 27. It can cooperate with the rotation of the ductile iron pipe 4 while moving, so as to realize comprehensive flaw detection of the inner wall of the ductile iron pipe 4, and the inspection range is wider.

[0038] In a further embodiment, a driven rotating rod 33 is rotatably mounted on the built-in movable plate 22, a reset spring 28 with an automatic reset function is provided on the driven rotating rod 33, and a collision knocking rod 29 for knocking the ductile iron pipe 4 is fixedly mounted on the reset spring 28, and a friction roller 26 matching the inner wall of the ductile iron pipe 4 is fixedly mounted on the driven rotating rod 33; The friction roller 26 fits against the inner wall of the ductile iron pipe 4. When the ductile iron pipe 4 rotates, the friction roller 26 is driven to rotate under the action of friction force. When the friction roller 26 rotates, the driven rotating rod 33 thereon is driven to rotate, and at the same time, the reset spring 28 is driven to rotate to store energy. When the reset spring 28 rotates, the collision knocking rod 29 thereon is driven to rotate synchronously until the collision knocking rod 29 rotates to contact the inner wall of the ductile iron pipe 4.

[0039] The external movable plate 20 is provided with a corrugation detector 23 for detecting the internal damage of the ductile iron pipe 4. When the collision knocking rod 29 rotates to contact the inner wall of the ductile iron pipe 4, the servo motor 9 will stop, thereby driving the ductile iron pipe 4 to stop rotating. When the ductile iron pipe 4 stops rotating, the friction roller 26 will stop rotating. At this time, the reset spring 28 will automatically reset, thereby driving the collision knocking rod 29 to rotate in the opposite direction and hit the inner wall of the ductile iron pipe 4, thereby generating a knocking vibration wave on the inner wall of the ductile iron pipe 4. When the collision knocking rod 29 knocks, the corrugation detector 23 located outside the ductile iron pipe 4 will be started synchronously, and the vibration waves generated on the ductile iron pipe 4 can be collected and detected and judged. The internal damage of the ductile iron pipe 4 can be judged by judging the conduction time and waveform of the vibration wave, thereby realizing internal flaw detection of the ductile iron pipe 4, and effectively detecting cracks and gaps inside the ductile iron pipe 4.

[0040] The corrugation detector 23 is a device commonly used in the prior art for detecting the form and waveform of vibration wave conduction inside an object. It can effectively detect gaps, holes, etc. inside the object according to the waveform changes. It can be used in this application document to effectively detect gaps and holes inside the ductile iron pipe 4. This device is a prior art and will not be described in detail here.

[0041] After the collision knocking rod 29 completes a single knock, the servo motor 9 will continue to start and drive the ductile iron pipe 4 to continue rotating, thereby driving the corrugation detector 23 to continue moving, and at the same time driving the friction roller 26 to rotate again, driving the collision knocking rod 29 to deflect again, until it moves to the next position and knocks on the next position of the ductile iron pipe 4 again, thereby realizing multi-position knocking and vibration wave detection on the ductile iron pipe 4, effectively improving the comprehensiveness of the internal detection of the ductile iron pipe 4 and the accuracy of the detection results.

[0042] The specific detection principle of the flaw detection equipment is as follows: when testing the ductile iron pipe 4, the ductile iron pipe 4 is first placed on a plurality of auxiliary rollers 6, and the two ends of the ductile iron pipe 4 are respectively located on the inner sides of two limit rings 5, so as to complete the preliminary placement and positioning of the ductile iron pipe 4; After the ductile iron pipe 4 is initially placed, multiple electric telescopic rods 15 are started synchronously to make multiple rubber arc plates 13 fit the inner wall of the ductile iron pipe 4 synchronously, that is, the internal extrusion fixation of the ductile iron pipe 4 is achieved by multiple rubber arc plates 13, and the stable internal clamping fixation of the ductile iron pipe 4 is achieved.

[0043] Then, the servo motor 9 is started to drive the driving roller 14 on its driving end to rotate. When the driving roller 14 rotates, the linkage roller 16 is driven to rotate through the cooperation of the driving wheel 31, the driven wheel 18 and the transmission belt 17. The rotation of the linkage roller 16 drives the threaded displacement rod 11 thereon to rotate, and then drives the driven nut 21 to make it move horizontally in the limit box 10. The driven nut 21 moves horizontally, driving the external movable plate 20 to move horizontally, driving the external electromagnetic plate 24 to slide horizontally on the outer wall of the ductile iron pipe 4. At this time, the multiple external cameras 27 on the external movable plate 20 will start to perform video inspection on the outside of the ductile iron pipe 4, and cooperate with the rotation of the ductile iron pipe 4 to achieve visual inspection of the outside of the ductile iron pipe 4. When the external movable plate 20 moves and drives the external electromagnetic plate 24 to move, the external electromagnetic plate 24 and the internal electromagnetic plate 25 are started synchronously so that the two are attracted to each other through the ductile iron pipe 4. At this time, when the external electromagnetic plate 24 moves, it will synchronously drive the internal electromagnetic plate 25 to move under the action of suction, thereby driving the internal movable plate 22 to move synchronously.

[0044] When the external moving plate 20 moves and drives the external electromagnetic plate 24 to move, the external electromagnetic plate 24 and the internal electromagnetic plate 25 are synchronously started so that the two are attracted to each other through the ductile iron pipe 4. When the external electromagnetic plate 24 moves, it will synchronously drive the internal electromagnetic plate 25 to move under the action of the suction force, thereby driving the internal moving plate 22 to move synchronously; When the built-in moving plate 22 moves, the multiple built-in cameras 30 thereon will start to carry out camera inspection of the inner wall of the ductile iron pipe 4. During the inspection, the ductile iron pipe 4 rotates synchronously. The camera inspection range is the same as that of the external camera 27. The camera 22 can cooperate with the rotation of the ductile iron pipe 4 while moving, so as to realize comprehensive flaw detection of the inner wall of the ductile iron pipe 4. When the ductile iron pipe 4 rotates, the friction roller 26 is driven to rotate under the action of friction force. The rotation of the friction roller 26 drives the collision knocking rod 29 to rotate synchronously with the cooperation of the driven rotating rod 33 and the reset spring 28. When the collision knocking rod 29 rotates to contact the inner wall of the ductile iron pipe 4, the servo motor 9 stops to stop the rotation of the ductile iron pipe 4. At this time, the reset spring 28 will automatically reset to drive the collision knocking rod 29 to rotate in the opposite direction and hit the inner wall of the ductile iron pipe 4, so as to generate knocking vibration waves inside the ductile iron pipe 4. When the collision knocking rod 29 knocks, the corrugation detector 23 located outside the ductile iron pipe 4 will be started synchronously to collect and detect the vibration waves generated on the ductile iron pipe 4. The internal damage of the ductile iron pipe 4 can be judged by judging the transmission time and waveform of the vibration waves, thereby realizing internal flaw detection of the ductile iron pipe 4 and effective detection of cracks and gaps inside the ductile iron pipe 4.

[0045] The embodiment of the present invention further provides a flaw detection method based on the production of ductile iron pipes, which is used for the above-mentioned flaw detection equipment based on the production of ductile iron pipes, and comprises the following steps: S1, preliminarily positioning the ductile iron pipe 4 through the erection unit, and then driving the plurality of rubber arc plates 13 to move through the positioning assembly to perform internal extrusion positioning on the ductile iron pipe 4; S2, start the driving assembly to drive the ductile iron pipe 4 to rotate in cooperation with the positioning assembly; S3, the driving component starts to drive the detection component to move with the cooperation of the synchronization component, and adjusts the relative position of the corrugation detector 23 in the detection component and the ductile iron pipe 4; S4. While the detection assembly is moving, the inner and outer walls of the ductile iron pipe 4 are visually inspected. At the same time, the collision knocking rod 29 intermittently knocks the ductile iron pipe 4 to generate vibration waves, and the sound prints are synchronously detected through the ripple detector 23.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A flaw detection device based on the production of ductile iron pipes, comprising a ductile iron pipe (4) to be detected arranged on a detection platform (8), characterized in that: Also includes: A mounting unit is arranged on the upper part of the detection platform (8) and is used to realize the preliminary placement and mounting of the ductile iron pipe (4). A processing box 1 (3) and a processing box 2 (7) are arranged on the detection platform (8); A positioning unit is arranged on the processing box (3), comprising a driving component and a positioning component, wherein a plurality of rubber arc plates (13) are arranged in the positioning component, and the plurality of rubber arc plates (13) are driven by the positioning component to realize the extrusion positioning of the ductile iron pipe (4), and the driving component cooperates with the positioning component to realize the positioning, steering and angle adjustment of the ductile iron pipe (4); The flaw detection unit is arranged on the detection platform (8), and comprises a synchronization component and a detection component. The detection component is provided with a corrugation detector (23) and a collision knocking rod (29) for knocking the ductile iron pipe (4). The synchronization component cooperates with the driving component to realize the position movement of the detection component, thereby adjusting the relative position of the corrugation detector (23) and the ductile iron pipe (4) to realize comprehensive flaw detection.

2. The flaw detection equipment based on ductile iron pipe production according to claim 1 is characterized in that: The flaw detection equipment also includes an equipment box (1), which is arranged at the bottom of the detection platform (8) and is used to support the detection platform (8) to improve detection stability; The detection platform (8) is provided with a control console (2) and a display platform, and the control console (2) is used to control the opening and closing and operating states of the positioning unit and the flaw detection unit, thereby realizing accurate automated flaw detection of the ductile iron pipe (4).

3. The flaw detection equipment based on ductile iron pipe production according to claim 1 is characterized in that: The mounting unit comprises two support frames (32) fixedly mounted on the detection platform (8), limit rings (5) being fixedly mounted on both support frames (32), and the ductile iron pipe (4) being located inside the two limit rings (5), and a middle frame being fixedly mounted on the detection platform (8), and a plurality of auxiliary rollers (6) cooperating with the ductile iron pipe (4) being rotatably mounted on the middle frame.

4. The flaw detection equipment based on ductile iron pipe production according to claim 1 is characterized in that: The driving assembly comprises a servo motor (9) fixedly mounted in a processing box (3), a driving roller (14) rotatably mounted between a driving end of the servo motor (9) and the processing box (3), a steering wheel (12) fixedly mounted on the driving roller (14), and a positioning assembly arranged on the steering wheel (12).

5. The flaw detection equipment based on ductile iron pipe production according to claim 4 is characterized in that: The positioning assembly comprises a plurality of electric telescopic rods (15) fixedly mounted on a steering wheel (12), and a rubber arc plate (13) for squeezing the inner wall of a ductile iron pipe (4) is fixedly mounted on the driving end of each electric telescopic rod (15), and each of the rubber arc plates (13) is provided with a plurality of friction transverse grooves (34) for increasing friction resistance.

6. The flaw detection equipment based on ductile iron pipe production according to claim 4 is characterized in that: The synchronization component comprises a linkage roller (16) rotatably mounted between a processing box 1 (3) and a processing box 2 (7); a driving wheel (31) is fixedly mounted on the driving roller (14); a driven wheel (18) is fixedly mounted on the linkage roller (16); and a transmission belt (17) is sleeved between the driving wheel (31) and the driven wheel (18).

7. The flaw detection equipment based on ductile iron pipe production according to claim 6 is characterized in that: The detection assembly comprises a limit box (10) fixedly mounted on the detection platform (8); a threaded displacement rod (11) is fixedly mounted on the linkage roller (16), and the threaded displacement rod (11) is located in the limit box (10); a driven nut (21) is slidably mounted in the limit box (10) via a sliding member, and the driven nut (21) is threadably matched with the threaded displacement rod (11); an external flaw detection mechanism is arranged on the driven nut (21), and an internal flaw detection mechanism is arranged on the second processing box (7).

8. The flaw detection equipment based on ductile iron pipe production according to claim 7 is characterized in that: The external flaw detection mechanism comprises an external movable plate (20) fixedly mounted on a driven nut (21), an external electromagnetic plate (24) in contact with the outer wall of the ductile iron pipe (4) being fixedly mounted on the external movable plate (20), a plurality of external cameras (27) for detecting damage to the outer wall of the ductile iron pipe (4) being fixedly mounted on the external movable plate (20), and a corrugation detector (23) for detecting internal damage to the ductile iron pipe (4) being arranged on the external movable plate (20).

9. The flaw detection equipment based on ductile iron pipe production according to claim 8 is characterized in that: The internal flaw detection mechanism comprises an elastic telescopic rod (19) fixedly mounted on the second processing box (7), and a built-in movable plate (22) is fixedly mounted on the elastic telescopic rod (19), and a built-in electromagnetic plate (25) that fits the inner wall of the ductile iron pipe (4) is fixedly mounted on the built-in movable plate (22), and the built-in electromagnetic plate (25) cooperates with the external electromagnetic plate (24); A driven rotating rod (33) is rotatably mounted on the built-in movable plate (22), a return spring (28) having an automatic return function is provided on the driven rotating rod (33), a collision knocking rod (29) for knocking the ductile iron pipe (4) is fixedly mounted on the return spring (28), and a friction roller (26) matching the inner wall of the ductile iron pipe (4) is fixedly mounted on the driven rotating rod (33).

10. A flaw detection method based on the production of ductile iron pipes, used for the flaw detection equipment based on the production of ductile iron pipes as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1, preliminarily positioning the ductile iron pipe (4) by means of a mounting unit, and then driving a plurality of rubber arc plates (13) to move by means of a positioning assembly to perform internal extrusion positioning on the ductile iron pipe (4); S2, starting the driving assembly to drive the ductile iron pipe (4) to rotate in cooperation with the positioning assembly; S3, the driving component starts to drive the detection component to move in cooperation with the synchronization component, and adjusts the relative position of the corrugation detector (23) in the detection component and the ductile iron pipe (4); S4. While the detection assembly is moving, the inner and outer walls of the ductile iron pipe (4) are visually inspected. At the same time, the impact knocking rod (29) intermittently knocks the ductile iron pipe (4) to generate vibration waves, and the sound print is synchronously detected through the ripple detector (23).

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