An online defect detector for inner wall of pipe

Abstract

The present invention relates to the technical field of pipeline detection, specifically to an online defect detector for inner wall of a pipe, comprising an electromagnet and its magnetic field controller, and a magnetic suspension detection block, wherein the magnetic field controller controls the magnetic field strength of the electromagnet, the pipeline is a non-magnetic pipeline, and comprises a detection controller, a pipeline horizontal conveying device, and a magnetic suspension detection block position signal sensing device, wherein the magnetic suspension detection block is suspended under the magnetic force of the electromagnet, the pipeline is carried by the pipeline horizontal conveying device from one side of the electromagnet through the electromagnet to the other side of the electromagnet, the inner diameter of the pipeline can accommodate the magnetic suspension detection block passing through, the magnetic suspension detection block position signal sensing device is located at the rear end of the pipeline transmission, and the detection controller is electrically connected to the magnetic field controller, the pipeline horizontal conveying device, and the magnetic suspension detection block position signal sensing device respectively. The present invention simplifies detection targets and means, can save detection time and reduce costs, accurately determine the position of convex point defects in the pipeline, and facilitate the cutting off of defective sections.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline detection, and in particular to an online defect detector for inner wall of a pipe. Background Art

[0002] The external defects of coiled pipes, such as plastic pipes, aluminum-plastic pipes, copper-plastic composite pipes, etc., are easy to find. However, since the inner diameters of these pipes are relatively small, it is difficult to use effective detection methods to detect the inside of the pipes. Currently, most of the disclosed technologies are about detecting whether the inner diameter of the pipe is qualified. Some are suitable for magnetic material pipes, and some are suitable for plastic pipes.

[0003] China's public patent "A pipeline inner diameter change detection device and detection method", with publication number CN107894211 A, discloses a pipeline inner diameter change detection device and detection method, including an elastic ball, the diameter of the elastic ball is larger than the inner diameter of the pipeline; an even number of laser emitters are evenly spaced on the surface of the elastic ball, and the even number of laser emitters can be located at both ends of the same diameter of the elastic ball; a bracket is provided at the center of the elastic ball; a number of laser receivers are correspondingly provided on the bracket; the laser emitter and the laser receiver jointly measure the distance between the surface of the elastic ball and the center of the elastic ball, which can effectively detect changes in the inner diameters of various pipelines. Another Chinese patent publication, "Device for detecting micro defects in pipelines, and method for detecting defect center and diameter", has a publication number of CN 108663432 A, which discloses that a Hall element and a magnet are installed on a detector in a pipeline, and each Hall element is provided with three pin slots for placing its own three pins respectively; the circular hole on the inner wall of the detector in the pipeline is used to place the magnet, and the Hall element is vertically inserted into the three pin slots, and the Hall element in the pin slot is installed parallel to the magnet in the circular hole, and the distance between the Hall element and the magnet should be greater than 2 mm; the magnet will magnetize the pipe wall, and when the detector in the pipeline passes through a micro defect in the pipeline, due to the large relative magnetic permeability of the micro defect in the pipeline, the magnetic field lines near the micro defect in the pipeline will bend and change, and the magnetic field signal induced by the Hall element is called a magnetic field characteristic signal; by identifying the magnetic field characteristic signal, the pipeline defect situation is identified, the location of the pipeline defect is located, and the pipeline maintenance is performed. At the same time, the present invention also detects the center and diameter of the micro defect in the pipeline, thereby improving the accuracy of the detection of micro defects in the pipeline.

[0004] At present, when producing coiled pipes, it is usually not necessary to use the precise detection methods and more detection items such as the two public patents mentioned above. It is only necessary to know whether there is a convex point defect on the inner wall of the pipe. After the convex point defect is detected, the pipe section containing the convex point defect can be removed. Summary of the invention

[0005] The object of the present invention is to provide an online defect detector for the inner wall of a pipe, so as to detect whether there is a convex point defect and locate the position of the convex point defect.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An online defect detector for inner wall of a pipe comprises an electromagnet and a magnetic field controller thereof, and a magnetic suspension detection block. The magnetic field controller controls the magnetic field strength of the electromagnet. The pipeline is a non-magnetic pipeline. The instrument comprises a detection controller, a pipeline horizontal conveying device, and a magnetic suspension detection block position signal sensing device. The magnetic suspension detection block is suspended under the magnetic force of the electromagnet. The pipeline is carried by the pipeline horizontal conveying device to pass through the electromagnet from one side of the electromagnet to the other side of the electromagnet. The inner diameter of the pipeline can accommodate the magnetic suspension detection block passing through. The magnetic suspension detection block position signal sensing device is located at the rear end of the pipeline transmission. The detection controller is electrically connected to the magnetic field controller, the pipeline horizontal conveying device, and the magnetic suspension detection block position signal sensing device respectively. In this solution, the electromagnet and its magnetic field controller adjust the magnetic field strength so that the magnetic suspension detection block is suspended in the air under the action of the electromagnet, and the outer diameter of the magnetic suspension detection block is smaller than the inner diameter of the pipeline. During detection, the magnetic suspension detection block passes into the pipeline, and the pipeline moves horizontally under the transmission of the horizontal conveyor, while the magnetic suspension detection block remains in place. When a convex defect appears in the pipeline, since the convex defect will block the magnetic suspension detection block, the magnetic suspension detection block is supported by the convex defect and moves with the pipeline. After the rear magnetic suspension detection block position signal sensor device immediately detects the position signal of the magnetic suspension detection block, the detection controller stops the transmission action of the pipeline horizontal conveyor, and then uses the magnetic suspension detection block position signal sensor device to position the magnetic suspension detection block in the pipeline, so as to cut off the section of the pipeline containing the convex defect, and take out the magnetic suspension detection block, put the magnetic suspension detection block back to its original position to suspend and pass into the subsequent pipeline for further detection; for pipelines with different inner diameters, only the appropriate magnetic suspension detection block needs to be replaced to perform inner wall convex point detection, and no other devices need to be replaced.

[0008] Preferably, the electromagnet is an annular body and is provided with an even number of magnetic poles, the magnetic poles are arranged symmetrically, at least two pairs of magnetic poles are provided, and a coil is wound around each magnetic pole. Since the magnetic suspension detection block needs to be magnetically supported, positioned, and adjusted on at least the upper and lower, left and right sides, and the front and back sides of the magnetic suspension detection block corresponding to the running direction of the pipeline do not need to be supported and positioned, at least two pairs of magnetic poles need to be provided, respectively located on the upper and lower sides and left and right sides of the magnetic suspension detection block, so as to magnetically support, position, and adjust the magnetic suspension detection block.

[0009] Preferably, the electromagnet is fixed on a horizontal moving device. When the magnetic suspension detection block passes into the pipeline, an active method can be adopted, that is, a horizontal moving device is used to make the electromagnet produce a horizontal movement, such as a cylinder piston rod drives the electromagnet to move, and the magnetic suspension detection block moves with the electromagnet under the magnetic attraction of the electromagnet and enters the pipeline; this solution adopts that the magnetic suspension detection block first passes into the pipeline and then moves the pipeline, which can solve the problem of how the magnetic suspension detection block enters the pipeline, and is also suitable for the situation where only the rear end traction is used for the pipeline movement.

[0010] Preferably, the two ends of the magnetic suspension detection block are hemispherical and the middle part is cylindrical. The magnetic suspension detection block can be a spherical body, but the spherical body is easy to roll over the convex defect when encountering a convex defect in the pipeline, which causes missed detection. The cylindrical body will not roll, but if the cylindrical body is too long, the cylindricality requirement in the pipeline is too high, which is easy to cause false detection. Therefore, the shorter the length of the cylindrical body, the better.

[0011] Preferably, the horizontal pipeline conveying device includes a front-end pipeline limiting device, a rear-end pipeline limiting device, and a rear-end pipeline winding device. The front-end pipeline limiting device and the rear-end pipeline limiting device are respectively located on both sides of the electromagnet. The front-end pipeline limiting device and the rear-end pipeline limiting device are both provided with a coaxial limiting tube that allows the pipeline to pass through. For ease of use, this solution adopts a horizontal pipeline conveying device. Of course, a non-horizontal pipeline conveying device can also achieve the purpose of this solution. The pipelines in this solution are plastic pipes, aluminum-plastic pipes, copper-plastic composite pipes, etc., which are generally formed into finished products after coiling. Therefore, as long as the pipeline passes through the position of the magnetic suspension detection block in a straight line when passing through the electromagnet-magnetic suspension detection block combination device, the two coaxial limit tubes can ensure that the pipeline is conveyed in a straight line. In particular, the limit tube can also be provided with a structure that can adjust the position, for example, a positioning sleeve is added to the limit tube, and a plurality of positioning screws are provided on the positioning sleeve, and the positioning screws extend into the positioning sleeve to position the limit tube; in addition, the limit tube of the front-end pipeline limit device and the pipeline entry end of the limit tube can be set as a bell mouth to facilitate the entry of the pipeline; for pipelines with different outer diameters, only the corresponding limit tube needs to be replaced; after the pipeline passes through the front-end pipeline limit device and the rear-end pipeline limit device manually or automatically, it is pulled by the rear pipeline winding device, and the pipeline that has completed the inspection can be wound into a coil.

[0012] Preferably, the magnetic suspension detection block position signal sensor device is movable, and includes a movable guide rail, a carrier that can move autonomously on the movable guide rail, and a position sensor, wherein the position sensor is arranged on the carrier. The magnetic suspension detection block position signal sensor device sends a signal after detecting the magnetic suspension detection block, and the detection controller stops the pipeline transmission after receiving the signal. During this process, the pipeline position will shift, and the magnetic suspension detection block position signal sensor device needs to be moved to find the pipeline position where the magnetic suspension detection block is located. After finding the pipeline position, the pipeline is cut off and the magnetic suspension detection block is found to re-perform subsequent detection.

[0013] Preferably, the magnetic suspension detection block position signal sensor device comprises a body, a position sensor, and a pipeline marking device, wherein the position sensor is arranged on the body, and the pipeline marking device comprises a marking liquid barrel, a pressure pump, a solenoid valve, and a nozzle, wherein the marking liquid barrel, the pressure pump, and the solenoid valve are arranged in the body, wherein the nozzle and the position sensor are arranged in parallel, and wherein the pressure pump and the solenoid valve are electrically connected to the detection controller. The purpose of this scheme is that when the magnetic suspension detection block position signal sensor device detects the magnetic suspension detection block position signal, it indicates that there is a convex point defect in the pipeline at that location, and at the same time, the signal is transmitted to the detection controller, and the detection controller immediately sends a signal to open the solenoid valve once and then close the solenoid valve, so that the pressure pump that has been in operation sends the marking liquid from the marking liquid barrel to the nozzle at the moment when the solenoid valve is opened, and the nozzle is facing the pipeline, thereby leaving a mark on the pipeline, and the staff cuts off the pipeline with the convex point defect according to the mark, and takes out the magnetic suspension detection block, and resets the magnetic suspension detection block for use.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. In the present invention, the detection objectives and means are simplified, and the detection objectives can be achieved for detection requirements that are not very demanding, and detection time can be saved and costs can be reduced.

[0016] 2. In the present invention, the position of the magnetic suspension detection block can be determined to accurately determine the position of the convex point defect in the pipeline, so as to facilitate the cutting off of the defective section. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A structural schematic diagram of the present invention.

[0018] Figure 2 It is a structural schematic diagram of the electromagnet of the present invention.

[0019] Figure 3 The figure is a structural schematic diagram of the magnetic suspension detection block position signal sensing device of the present invention.

[0020] Figure 4This is a schematic diagram of normal detection according to an embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of detecting convex points on the inner wall of a pipeline according to an embodiment of the present invention.

[0022] In the figure: 1-electromagnet 2-magnetic field controller 3-magnetic levitation detection block 4-pipeline

[0023] 5-Detection controller 6-Pipeline horizontal conveying device

[0024] 7-Magnetic suspension detection block position signal sensor device 61-Front end pipeline limit device

[0025] 62-rear pipe limit device 63-rear pipe reel device 64-limit pipe

[0026] 71-moving guide rail 72-carrier 73-position sensor 74-body

[0027] 75-Pipeline marking device 751-Marking liquid barrel 752-Pressure pump

[0028] 753-Solenoid valve 754-Nozzle. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-5 , the present invention provides a technical solution:

[0031] like Figure 1 , an online defect detector for inner wall of pipe, comprising an electromagnet 1 and its magnetic field controller 2, and a magnetic suspension detection block 3, wherein the magnetic field controller 2 controls the magnetic field strength of the electromagnet 1, and the pipeline 4 is a non-magnetic pipeline, comprising a detection controller 5, a pipeline horizontal conveying device 6, and a magnetic suspension detection block position signal sensor 7, the magnetic suspension detection block 3 is suspended under the magnetic force of the electromagnet 1, the pipeline 4 is carried by the pipeline horizontal conveying device 6 from one side of the electromagnet 1 through the electromagnet 1 to the other side of the electromagnet 1, the inner diameter of the pipeline 4 can accommodate the magnetic suspension detection block 3 passing through, the magnetic suspension detection block position signal sensor 7 is located at the rear end of the pipeline 4, and the detection controller 5 is electrically connected to the magnetic field controller 2, the pipeline horizontal conveying device 6, and the magnetic suspension detection block position signal sensor 7 respectively; the two ends of the magnetic suspension detection block 3 are hemispherical and the middle part is cylindrical;

[0032] like Figure 2 The electromagnet 1 is an annular body and is provided with an even number of magnetic poles, which are arranged symmetrically, and there are at least two pairs of magnetic poles, each of which is wound with a coil;

[0033] The electromagnet 1 is fixed on a horizontal moving device;

[0034] The pipeline horizontal conveying device 6 includes a front pipeline limiting device 61, a rear pipeline limiting device 62, and a rear pipeline winding device 63. The front pipeline limiting device 61 and the rear pipeline limiting device 62 are respectively located on both sides of the electromagnet 1. The front pipeline limiting device 61 and the rear pipeline limiting device 62 are both provided with a coaxial limiting tube 64 that allows the pipeline 4 to pass through.

[0035] Embodiment 1, as Figure 1 The magnetic suspension detection block position signal sensor device 7 is movable, and the magnetic suspension detection block position signal sensor device 7 includes a movable guide rail 71, a carrier 72 that can move autonomously on the movable guide rail 71, and a position sensor 73, and the position sensor 73 is arranged on the carrier 72;

[0036] Embodiment 2, as Figure 3 The magnetic suspension detection block position signal sensing device 7 includes a main body 74, a position sensor 73, and a pipeline marking device 75. The position sensor 73 is arranged on the main body 74. The pipeline marking device 75 includes a marking liquid barrel 751, a pressure pump 752, a solenoid valve 753, and a nozzle 754. The marking liquid barrel 751, the pressure pump 752, and the solenoid valve 753 are arranged in the main body 74. The nozzle 754 and the position sensor 73 are arranged in parallel. The pressure pump 752 and the solenoid valve 753 are electrically connected to the detection controller 5.

[0037] The working process of the present invention is as follows: first, the electromagnet 1 adjusts the magnetic field strength under the control of the magnetic field controller 2, so that the magnetic suspension detection block 3 is suspended in the air under the action of the electromagnet 1, and the outer diameter of the magnetic suspension detection block 3 is smaller than the inner diameter of the pipeline 4. During the detection, the magnetic suspension detection block 3 passes through the pipeline 4, and the pipeline 4 moves horizontally under the transmission of the pipeline horizontal conveying device 6, while the magnetic suspension detection block 3 remains in its original position. When a convex defect appears in the pipeline 4, since the convex defect will block the magnetic suspension detection block 3, the magnetic suspension detection block 3 is supported by the convex defect and moves with the pipeline 4. After the rear magnetic suspension detection block position signal sensor 7 detects the position signal of the magnetic suspension detection block 3, the detection controller 5 stops the transmission action of the pipeline horizontal conveying device 6, and then uses the magnetic suspension detection block position signal sensor 7 to position the magnetic suspension detection block 3 in the pipeline 4, so as to cut off the section of the pipeline 4 containing the convex defect, and take out the magnetic suspension detection block 3, put the magnetic suspension detection block 3 back to its original position to suspend and pass into the subsequent pipeline 4 to continue the detection;

[0038] Alternatively, when the magnetic levitation detection block position signal sensor device 7 detects the position signal of the magnetic levitation detection block 3, it indicates that there is a convex point defect in the pipeline 4 at that location. At the same time, the signal is transmitted to the detection controller 5. The detection controller 5 immediately sends a signal to open the solenoid valve 753 once and then closes the solenoid valve 753, so that the pressure pump 752, which has been in operation, sends the marking liquid from the marking liquid barrel 751 to the nozzle 754 at the moment the solenoid valve 753 opens and sprays it out. The nozzle 754 faces the pipeline 4, thereby leaving a mark on the pipeline 4. Then the detection controller 5 stops the conveying action of the pipeline horizontal conveying device 6, and the staff cuts off the pipeline 4 with the convex point defect according to the mark, takes out the magnetic levitation detection block 3, and resets the magnetic levitation detection block 3 for use.

[0039] For pipes 4 with different inner diameters or outer diameters, it is only necessary to replace the appropriate magnetic suspension detection block 3 and the limit tube 64 to perform the inner wall convex point detection without replacing other devices.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An online defect detector for inner wall of pipe, comprising an electromagnet and its magnetic field controller, and a magnetic suspension detection block, wherein the magnetic field controller controls the magnetic field strength of the electromagnet, and the pipe is a non-magnetic pipe. Features: It includes a detection controller, a pipeline horizontal conveying device, and a magnetic suspension detection block position signal sensor device. The magnetic suspension detection block is suspended under the magnetic force of the electromagnet. The pipeline is carried by the pipeline horizontal conveying device from one side of the electromagnet to the other side of the electromagnet. The inner diameter of the pipeline allows the magnetic suspension detection block to pass through. The magnetic suspension detection block position signal sensor device is located at the rear end of the pipeline transmission. The detection controller is electrically connected to the magnetic field controller, the pipeline horizontal conveying device, and the magnetic suspension detection block position signal sensor device respectively. The electromagnet is annular and has an even number of magnetic poles, the magnetic poles are symmetrically arranged, at least two pairs of magnetic poles are provided, and each magnetic pole is wound with a coil; The magnetic suspension detection block has hemispherical bodies at both ends and a cylindrical body in the middle; The pipeline horizontal conveying device comprises a front-end pipeline limiting device, a rear-end pipeline limiting device, and a rear-end pipeline winding device. The front-end pipeline limiting device and the rear-end pipeline limiting device are respectively located on both sides of the electromagnet. The front-end pipeline limiting device and the rear-end pipeline limiting device are both provided with a coaxial limiting pipe for allowing the pipeline to pass through; The magnetic levitation detection block position signal sensing device is mobile, and includes a moving guide rail, a carrier that moves autonomously on the moving guide rail, and a position sensor, and the position sensor is arranged on the carrier; or, the magnetic levitation detection block position signal sensing device includes a main body, a position sensor, and a pipeline marking device, and the position sensor is arranged on the main body. The pipeline marking device includes a marking liquid barrel, a pressure pump, a solenoid valve, and a nozzle, and the marking liquid barrel, pressure pump, and solenoid valve are arranged in the main body. The nozzle and the position sensor are arranged in parallel, and the pressure pump and the solenoid valve are electrically connected to the detection controller.

2. The online defect detector for inner wall of a pipe according to claim 1, Features: The electromagnet is fixed on a horizontal moving device.

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