CN118032936A - Internal and external defect detection system based on PE heat preservation pipe processing - Google Patents
Internal and external defect detection system based on PE heat preservation pipe processing Download PDFInfo
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Abstract
The invention provides an internal and external defect detection system based on PE heat preservation pipe processing, which comprises a detection table, a liquid storage tank, a pipeline supporting device, a pipeline fixing device, an ultrasonic detection device and a signal processing device, wherein the detection table is connected with the liquid storage tank; the liquid storage tank is arranged on the detection table and is used for containing detection liquid; the pipeline supporting device is arranged in the liquid storage tank and is used for supporting and limiting the PE heat-insulating pipe placed in the liquid storage tank; the pipeline fixing device is movably connected with the detection table and is used for fixing the PE heat-insulating pipe; the ultrasonic detection device is arranged on the detection table and is used for sending out detection wave signals to the fixed PE heat preservation pipe and receiving echo signals of the detection wave signals; the ultrasonic detection device comprises a first working state and a second working state; the signal processing device is in communication connection with the ultrasonic detection device and is used for processing echo signals to obtain internal and external defects of the PE heat-insulating pipe, so that the detection efficiency and accuracy are improved on the basis of realizing hidden damage detection.
Description
Technical Field
The invention relates to the technical field of PE pipe detection, in particular to an internal and external defect detection system based on PE heat preservation pipe processing.
Background
And the defect detection is carried out on the PE heat-insulating pipe, so that unqualified heat-insulating pipes can be screened out, the qualification rate of the heat-insulating pipes is improved, and the service life of the heat-insulating pipes is prolonged. The prior art usually detects PE heat preservation pipes through air tightness, and the detection step usually comprises the steps of sealing and fixing a pipeline on a detection table, placing a detection device in the pipeline to divide the pipeline into two chambers, and detecting defects of the pipeline through analyzing air pressure changes at two ends of the detection device. However, inspection of PE insulation pipes by air tightness generally detects only penetration type defects that affect air tightness, but cannot detect hidden damages of PE insulation pipes.
In view of the above, the invention provides an internal and external defect detection system based on PE heat preservation pipe processing, which detects PE heat preservation pipes through ultrasonic waves so as to improve the detection efficiency and accuracy on the basis of realizing hidden damage detection.
Disclosure of Invention
The invention aims to provide an internal and external defect detection system based on PE heat preservation pipe processing, which comprises a detection table, a liquid storage tank, a pipeline supporting device, a pipeline fixing device, an ultrasonic detection device and a signal processing device; the liquid storage tank, the pipeline supporting device, the pipeline fixing device and the ultrasonic detection device are arranged on the detection table; the liquid storage tank is arranged on the detection table and is used for containing detection liquid; the pipeline supporting device is arranged in the liquid storage tank and used for supporting and limiting the PE heat-insulating pipe placed in the liquid storage tank; the pipeline fixing device is movably connected with the detection table and is used for fixing the PE heat-insulating pipe; the ultrasonic detection device is arranged on the detection table and is used for sending out detection wave signals to the fixed PE heat preservation pipe and receiving echo signals of the detection wave signals; the ultrasonic detection device comprises a first working state and a second working state; the first working state refers to a state that the ultrasonic detection device detects an initial defect; when the ultrasonic detection device is in the first working state, selecting one ultrasonic probe from each ultrasonic detection unit as a transmitting probe, and other probes as receiving probes; the second working state is a state in which the ultrasonic detection device identifies the initial defect; when the ultrasonic detection device is in the second working state, an ultrasonic probe at the initial defect is used as a transmitting probe and a receiving probe, and the initial defect is detected; the signal processing device is in communication connection with the ultrasonic detection device and is used for processing the echo signals to obtain internal and external defects of the PE heat preservation pipe, and the method comprises the steps of obtaining a plurality of groups of first echo sets; the first echo is an echo signal received by the receiving probe in the first working state; the first echo set is a set formed by a plurality of echo signals received by the ultrasonic detection unit; determining an internal defect and its first location based on the first echoes in each set of first echoes; determining an external defect and a second position thereof based on the plurality of sets of first echo sets; acquiring a second echo at the first location and/or the second location; the second echo is an echo signal received by the ultrasonic probe in the working state in the second working state; based on the second echo, a defect type of the internal defect and/or the external defect is determined.
Further, the pipeline supporting device comprises a limiting groove; the limiting groove consists of a plurality of pipeline supporting units which are axially distributed along the limiting groove; the pipe support unit includes a first support member and a second support member; the first supporting component and the second supporting component both comprise sloping surfaces, and the sloping surfaces of the first supporting component and the second supporting component are oppositely arranged; the outer surface of the PE heat preservation pipe is contacted with the slope surface, and the position of the axis of the PE heat preservation pipe is adjusted by adjusting the relative positions of the first supporting part and the second supporting part.
Further, the pipeline fixing device is arranged at two ends of the pipeline supporting device and comprises a first pipeline fixing unit and a second pipeline fixing unit; the PE heat insulation pipe comprises a PE heat insulation pipe, a first pipeline fixing unit and a second pipeline fixing unit, wherein the PE heat insulation pipe is connected with the PE heat insulation pipe, the PE heat insulation pipe is connected with the first pipeline fixing unit and the second pipeline fixing unit, the PE heat insulation pipe is connected with the PE heat insulation pipe, the PE heat insulation pipe is connected with the first pipeline fixing unit, the PE heat insulation pipe is connected with the second pipeline fixing unit, the PE heat insulation pipe, and the PE heat insulation; and the pipeline fixing device moves along the axial direction of the PE heat preservation pipe.
Further, when the detection is not performed, the pipeline fixing device is at an idle fixed position; when the PE heat-insulating pipe is fixed, the pipeline fixing device is positioned at a fixed position; when the insulating pipe is detected, the pipeline fixing device moves between a first fixed detection position and a second fixed detection position; when the pipeline fixing device is at the idle fixed position, the distance between the first pipeline fixing unit and the second pipeline fixing unit is larger than the axial length of the PE heat-insulating pipe; when the pipeline fixing device is at the fixing position, the distance between the first pipeline fixing unit and the second pipeline fixing unit is smaller than the axial length of the PE heat-insulating pipe; when the pipeline fixing device is positioned at the first fixed detection position, the distance between the first pipeline fixing unit and the ultrasonic detection device is the smallest; when the pipeline fixing device is positioned at the second fixed detection position, the distance between the second pipeline fixing unit and the ultrasonic detection device is the smallest.
Further, the ultrasonic detection device comprises a plurality of ultrasonic detection units axially arranged along the PE heat preservation pipe, and each ultrasonic detection unit is provided with a plurality of ultrasonic probes; the ultrasonic detection unit comprises a first ultrasonic detection component and a second ultrasonic detection component, wherein the first ultrasonic detection component and the second ultrasonic detection component are in complementary circular arcs, one ends of the first ultrasonic detection component and the second ultrasonic detection component are connected in a rotating mode, and the other ends of the first ultrasonic detection component and the second ultrasonic detection component are connected in an opening and closing mode.
Further, when no detection is performed, the ultrasonic detection unit is in an on state; when detection is carried out, the ultrasonic detection unit is in a closed state; when the ultrasonic detection unit is in the open state, the end points of the first ultrasonic detection part and the second ultrasonic detection part which are in open-close connection are disconnected, and the distance between the two end points is larger than the outer diameter of the PE heat insulation pipe; when the ultrasonic detection unit is in the closed state, the end points of the first ultrasonic detection component and the second ultrasonic detection component which are in open-close connection are closed, so that the ultrasonic detection unit is annular.
Further, the plurality of ultrasonic probes are equidistantly arranged along the inner peripheral surface of the annular ultrasonic detection unit, and the ultrasonic detection device further comprises a first adjustment unit and a second adjustment unit; the first adjusting unit is used for rotating the ultrasonic detection unit; the second adjusting unit is used for rotating the ultrasonic probe; the ultrasonic detection unit rotates by taking the axis of the ultrasonic detection unit as a rotating shaft; the ultrasonic probe rotates around an ultrasonic emission endpoint as a center along the circumferential direction of the ultrasonic detection unit.
Further, the number of probes of the ultrasonic probes is C, and the calculation formula of the number of probes C is:
; wherein/> Representing the number of probes; Representing the vertical distance between an incident point and the incident diameter of the PE heat preservation pipe, wherein the incident diameter is parallel to the detection wave signal of the incident point; r represents the outer diameter of the PE heat-insulating pipe; g represents the shortest distance between the incident point and the outer surface of the PE heat preservation pipe; /(I) Representing the propagation speed of transverse waves in the PE heat-insulating pipe; /(I)Representing the propagation speed of the longitudinal wave in the detection liquid; r represents the inner diameter of the PE heat-insulating pipe.
Further, the calculation formula of the vertical distance X between the incident point and the incident diameter of the PE heat preservation pipe is as follows:
; wherein/> Representing the propagation velocity of the longitudinal wave in the PE insulating pipe.
Further, the number of probes of the ultrasonic probes is C, and the calculation formula of the number of probes C is:
; wherein/> Representing maximum value; c represents the number of probes, which is greater than or equal to 4, and C is taken as the final number of probes when the maximum value is obtained; r represents the inner diameter of the PE heat-insulating pipe; r represents the outer diameter of the PE heat-insulating pipe.
The technical scheme of the embodiment of the invention has at least the following advantages and beneficial effects:
According to the invention, the ultrasonic detection device is provided with the plurality of detection states, the initial defect is detected through the first working state, and then the initial defect is further detected through the second working state, so that the pipeline can be prevented from being directly scanned by the second working state, the detection time is shortened, and the detection efficiency and accuracy are improved. And by comprehensively analyzing the first echo and the second echo, the accuracy of the detection structure is improved.
Drawings
FIG. 1 is an exemplary block diagram of an internal and external defect detection system based on PE insulating pipe processing provided by the invention;
FIG. 2 is an exemplary block diagram of a pipe support apparatus provided by the present invention;
FIG. 3 is an exemplary block diagram of an ultrasonic detection device provided by the present invention;
Icon: 1-detecting table, 2-liquid storage tank, 3-pipeline supporting device, 4-pipeline fixing device, 5-ultrasonic detecting device, 31-first supporting component, 32-second supporting component, 51-ultrasonic probe, 52-first ultrasonic detecting component and 53-second ultrasonic detecting component.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
As shown in fig. 1, the PE heat-insulating pipe processing-based internal and external defect detection system disclosed by the invention comprises a detection table 1, a liquid storage tank 2, a pipeline supporting device 3, a pipeline fixing device 4, an ultrasonic detection device 5 and a signal processing device.
The detection table 1 is provided with a liquid storage tank 2, a pipeline supporting device 3, a pipeline fixing device 4 and an ultrasonic detection device 5. The liquid storage tank 2 is arranged on the detection table 1 and is used for containing detection liquid. The pipeline supporting device 3 is arranged in the liquid storage tank and is used for supporting and limiting the PE heat-insulating pipe placed in the liquid storage tank. The pipeline fixing device 4 is movably connected with the detection table 1 and is used for fixing the PE heat-insulating pipe. The ultrasonic detection device 5 is arranged on the detection table 1 and is used for sending out detection wave signals to the fixed PE thermal insulation pipe and receiving echo signals of the detection wave signals. The signal processing device is in communication connection with the ultrasonic detection device and is used for processing echo signals to obtain the internal and external defects of the PE heat-insulating pipe.
The ultrasonic detection device comprises a first working state and a second working state; the first working state refers to a state that the ultrasonic detection device detects an initial defect; when the ultrasonic detection device is in a first working state, one ultrasonic probe is selected from each ultrasonic detection unit to be used as a transmitting probe for transmitting a first detection wave signal, and other probes are used as receiving probes for receiving a plurality of first echo signals. The second working state is a state in which the ultrasonic detection device identifies the initial defect; when the ultrasonic detection device is in the second working state, the ultrasonic probe at the initial defect is used as a transmitting probe and a receiving probe to transmit and receive ultrasonic signals, so that the initial defect is further detected. Wherein the ultrasonic probe at the initial defect may be the first probe in a clockwise direction. Taking fig. 3 as an example, if a defect of a pipeline is between pipe sections corresponding to end points of closed open-close connection, an ultrasonic probe on the left of the end points of open-close connection may be used as an ultrasonic probe at an initial defect.
Processing echo signals to obtain internal and external defects of the PE heat-insulating pipe, wherein the processing comprises the steps of obtaining a plurality of groups of first echo sets; the first echo is an echo signal received by the receiving probe in a first working state; the first echo set is a set composed of a plurality of echo signals received by the ultrasonic detection unit. For example, for a single ultrasonic detection unit, one of the ultrasonic probes may be used as a transmitting probe for transmitting detection wave signals of a plurality of frequencies; and using the other probes as receiving probes to receive echo signals corresponding to the detection wave signals with a plurality of frequencies. An internal defect and its first location are determined based on the first echoes in each set of first echoes. Internal defects may refer to defects that exist inside the pipe. For example, internal defects may include internal cracks, holes, delamination defects, and the like. The first position may refer to the position of an internal defect, and when a defect occurs, the position between its corresponding two probes may be considered the first position. For a single ultrasonic detection unit, the parameters of wave shape, amplitude, frequency and the like of a plurality of first echoes can be observed to determine which two ultrasonic probes the defect is present between. For example, when the pulse absence is detected, a plurality of first ultrasonic probe groups in which the pulse is not detected may be determined in a clockwise direction, a plurality of second ultrasonic probe groups in which the pulse is not detected may be determined in a counterclockwise direction, and a pipe section between two ultrasonic probes in which the pulse absence occurs first in the first ultrasonic probe group and the second ultrasonic probe group may be taken as a first position where the internal defect is located. Based on the plurality of sets of first echo sets, an external defect and a second location thereof are determined. External defects may refer to defects that exist outside the pipe. For example, the external defects may include a concave-convex defect, a pipe thickness defect, and the like. The second position may refer to a position of an external defect, and when a defect occurs, a position between its corresponding two probes may be regarded as the second position. For the plurality of ultrasonic detection units, parameters such as wave shape, amplitude, frequency, and the like of the plurality of first echoes may be observed to determine between which two ultrasonic probes the defect occurs. For example, when the number of modes of the guided wave of the current pipe section relative to other pipe sections increases and the cutoff frequency decreases, the pipe thickness at that pipe section can be considered to be greater than the other pipe sections. For another example, when the phase velocity difference between the first order mode and the second order mode of the current pipe section at a high frequency with respect to the other pipe section increases, the pipe diameter at the pipe section can be considered smaller than the pipe diameters of the other pipe sections. Acquiring a second echo at the first location and/or the second location; the second echo is an echo signal received by the ultrasonic probe in the working state in the second working state. For example, for a single ultrasonic detection unit, a first ultrasonic probe in the clockwise direction at a first position or a second position where an internal defect or an external defect is found may be used as a probe having both ultrasonic transmission and reception functions, and the probe may adjust a plurality of incidence angles to detect defects at the first position and the second position. Based on the second echo, a defect type of the internal defect and/or the external defect is determined. The defect types of the internal defects may include internal cracks, holes, delamination defects, and the like. The external defects may include concave-convex defects, pipe thickness defects, and the like. For the plurality of ultrasonic detection units, parameters such as wave shape, amplitude, frequency and the like of the plurality of second echoes and the corresponding first echoes can be observed, and the types of the internal defects and the external defects can be determined. For example, the size and depth of the defect may be determined based on the first echo and the second echo, and the defect may be classified by the size and depth of the defect.
In some embodiments, the pipe support device 3 comprises a limit groove; the limit groove is composed of a plurality of pipeline supporting units which are axially distributed along the limit groove. As shown in fig. 2, the pipe support unit includes a first support member 31 and a second support member 32; the first supporting part 31 and the second supporting part 32 comprise sloping surfaces, and the sloping surfaces of the first supporting part and the second supporting part are oppositely arranged; the outer surface of the PE heat preservation pipe is contacted with the slope surface, and the position of the axis of the PE heat preservation pipe is adjusted by adjusting the relative positions of the first supporting part and the second supporting part.
In some embodiments, the pipe fixing device 4 is disposed at both ends of the pipe supporting device, and includes a first pipe fixing unit and a second pipe fixing unit; the parts of the first pipeline fixing unit and the second pipeline fixing unit, which are connected with the PE heat preservation pipe, are provided with grooves, the size and shape of the grooves correspond to the cross section shape of the PE heat preservation pipe, and the peripheral surfaces of the grooves are provided with sealing parts; the pipeline fixing device moves along the axial direction of the PE heat preservation pipe. When the detection is not carried out, the pipeline fixing device is at an idle fixed position; when the PE heat-insulating pipe is fixed, the pipeline fixing device is positioned at a fixed position; when detecting the insulating pipe, the pipe fixing device moves between the first fixed detection position and the second fixed detection position. The idle fixed position refers to a position of the pipeline fixing device when idle, and when the pipeline fixing device is in the idle fixed position, the distance between the first pipeline fixing unit and the second pipeline fixing unit is greater than the axial length of the PE heat insulation pipe. The fixed position refers to a position when the PE heat-insulating pipe is fixed by the pipe fixing device, and when the pipe fixing device is at the fixed position, the distance between the first pipe fixing unit and the second pipe fixing unit is smaller than the axial length of the PE heat-insulating pipe. The first fixed detection position is the initial position for detecting the PE heat-insulating pipe, and when the pipeline fixing device is positioned at the first fixed detection position, the distance between the first pipeline fixing unit and the ultrasonic detection device is the smallest. The second fixed detection position is the end position for detecting the PE heat preservation pipe, and when the pipeline fixing device is positioned at the second fixed detection position, the distance between the second pipeline fixing unit and the ultrasonic detection device is the smallest.
In some embodiments, the ultrasonic detection device 5 comprises a plurality of ultrasonic detection units disposed axially along the PE holding tube. As shown in fig. 3, a plurality of ultrasonic probes 51 are provided on each ultrasonic detection unit; the ultrasonic detection unit includes a first ultrasonic detection member 52 and a second ultrasonic detection member 53, which are in complementary circular arcs, and are rotatably connected at one end and are open-close connected at the other end. When the detection is not performed, the ultrasonic detection unit is in an on state; when the detection is performed, the ultrasonic detection unit is in a closed state. The on state refers to a state when the ultrasonic detection unit does not perform ultrasonic detection. When the ultrasonic detection unit is in an on state, the end points of the first ultrasonic detection part 52 and the second ultrasonic detection part 53 which are in open-close connection are disconnected, and the distance between the two end points is larger than the outer diameter of the PE heat insulation pipe. The closed state refers to a state when the ultrasonic detection unit performs ultrasonic detection. When the ultrasonic detection unit is in a closed state, the end points of the first ultrasonic detection component and the second ultrasonic detection component which are in open-close connection are closed, so that the ultrasonic detection unit is annular (shown in fig. 3).
In some embodiments, the plurality of ultrasonic probes are disposed equidistantly along the inner circumferential surface of the ring-shaped ultrasonic detection unit. As shown in fig. 3 for example, 8 ultrasonic probes are equidistantly arranged. The ultrasonic detection device also comprises a first adjusting unit and a second adjusting unit; the first adjusting unit is used for rotating the ultrasonic detection unit; the second adjusting unit is used for rotating the ultrasonic probe; the ultrasonic detection unit rotates by taking the axis of the ultrasonic detection unit as a rotating shaft so as to adjust the position of the ultrasonic probe; the ultrasonic probe rotates around the ultrasonic emission end point as a center along the circumferential direction of the ultrasonic detection unit to adjust the incident angle of the ultrasonic probe.
In some embodiments, the number of probes of the plurality of ultrasonic probes is C, and the calculation formula of the number of probes C is:
; wherein/> Representing the number of probes; Representing the vertical distance between an incident point and the incident diameter of the PE heat preservation pipe, wherein the incident diameter is parallel to the detection wave signal of the incident point; r represents the outer diameter of the PE heat-insulating pipe; g represents the shortest distance between the incident point and the outer surface of the PE heat preservation pipe; /(I) Representing the propagation speed of transverse waves in the PE heat-insulating pipe; /(I)Representing the propagation speed of the longitudinal wave in the detection liquid; r represents the inner diameter of the PE heat-insulating pipe. The number of probes is set through the formula, so that each angle can be guaranteed to be detected by the probes, the detection blind area is reduced, and the detection precision is improved. Further, the calculation formula of the vertical distance X between the incident point and the incident diameter of the PE heat preservation pipe is as follows:
; wherein/> Representing the propagation velocity of the longitudinal wave in the PE insulating pipe.
In some embodiments, the number of probes of the plurality of ultrasonic probes is C, and the calculation formula of the number of probes C is:
; wherein/> Representing maximum value; c represents the number of probes, which is greater than or equal to 4, and C is taken as the final number of probes when the maximum value is obtained; r represents the inner diameter of the PE heat-insulating pipe; r represents the outer diameter of the PE heat-insulating pipe. Since the detection area increases with the increase of the number of the ultrasonic probes, but too many ultrasonic probes also bring about cost increase and interference, the balance value can be obtained between the number of the probes and the detection area by setting the number of the probes through the formula, so that the number of the probes is as small as possible on the basis of ensuring the detection area, the cost is reduced, and the interference is reduced.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The internal and external defect detection system based on PE heat preservation pipe processing is characterized by comprising a detection table, a liquid storage tank, a pipeline supporting device, a pipeline fixing device, an ultrasonic detection device and a signal processing device;
the liquid storage tank, the pipeline supporting device, the pipeline fixing device and the ultrasonic detection device are arranged on the detection table;
the liquid storage tank is arranged on the detection table and is used for containing detection liquid;
the pipeline supporting device is arranged in the liquid storage tank and used for supporting and limiting the PE heat-insulating pipe placed in the liquid storage tank;
the pipeline fixing device is movably connected with the detection table and is used for fixing the PE heat-insulating pipe;
The ultrasonic detection device is arranged on the detection table and is used for sending out detection wave signals to the fixed PE heat preservation pipe and receiving echo signals of the detection wave signals; the ultrasonic detection device comprises a first working state and a second working state; the first working state refers to a state that the ultrasonic detection device detects an initial defect; when the ultrasonic detection device is in the first working state, selecting one ultrasonic probe from each ultrasonic detection unit as a transmitting probe, and other probes as receiving probes; the second working state is a state in which the ultrasonic detection device identifies the initial defect; when the ultrasonic detection device is in the second working state, an ultrasonic probe at the initial defect is used as a transmitting probe and a receiving probe, and the initial defect is detected;
The signal processing device is in communication connection with the ultrasonic detection device and is used for processing the echo signals to obtain internal and external defects of the PE heat preservation pipe, and the method comprises the steps of obtaining a plurality of groups of first echo sets; the first echo is an echo signal received by the receiving probe in the first working state; the first echo set is a set formed by a plurality of echo signals received by the ultrasonic detection unit; determining an internal defect and its first location based on the first echoes in each set of first echoes; determining an external defect and a second position thereof based on the plurality of sets of first echo sets; acquiring a second echo at the first location and/or the second location; the second echo is an echo signal received by the ultrasonic probe in the working state in the second working state; based on the second echo, a defect type of the internal defect and/or the external defect is determined.
2. The PE insulation pipe processing-based internal and external defect detection system according to claim 1, wherein the pipe supporting device comprises a limit groove; the limiting groove consists of a plurality of pipeline supporting units which are axially distributed along the limiting groove; the pipe support unit includes a first support member and a second support member; the first supporting component and the second supporting component both comprise sloping surfaces, and the sloping surfaces of the first supporting component and the second supporting component are oppositely arranged; the outer surface of the PE heat preservation pipe is contacted with the slope surface, and the position of the axis of the PE heat preservation pipe is adjusted by adjusting the relative positions of the first supporting part and the second supporting part.
3. The PE thermal insulation pipe processing-based internal and external defect detection system according to claim 1, wherein the pipe fixing devices are arranged at two ends of the pipe supporting device and comprise a first pipe fixing unit and a second pipe fixing unit; the PE heat insulation pipe comprises a PE heat insulation pipe, a first pipeline fixing unit and a second pipeline fixing unit, wherein the PE heat insulation pipe is connected with the PE heat insulation pipe, the PE heat insulation pipe is connected with the first pipeline fixing unit and the second pipeline fixing unit, the PE heat insulation pipe is connected with the PE heat insulation pipe, the PE heat insulation pipe is connected with the first pipeline fixing unit, the PE heat insulation pipe is connected with the second pipeline fixing unit, the PE heat insulation pipe, and the PE heat insulation; and the pipeline fixing device moves along the axial direction of the PE heat preservation pipe.
4. The PE insulation pipe machining-based internal and external defect detection system according to claim 3, wherein the pipe fixing device is in a fixed position at idle when no detection is performed; when the PE heat-insulating pipe is fixed, the pipeline fixing device is positioned at a fixed position; when the insulating pipe is detected, the pipeline fixing device moves between a first fixed detection position and a second fixed detection position; when the pipeline fixing device is at the idle fixed position, the distance between the first pipeline fixing unit and the second pipeline fixing unit is larger than the axial length of the PE heat-insulating pipe; when the pipeline fixing device is at the fixing position, the distance between the first pipeline fixing unit and the second pipeline fixing unit is smaller than the axial length of the PE heat-insulating pipe; when the pipeline fixing device is positioned at the first fixed detection position, the distance between the first pipeline fixing unit and the ultrasonic detection device is the smallest; when the pipeline fixing device is positioned at the second fixed detection position, the distance between the second pipeline fixing unit and the ultrasonic detection device is the smallest.
5. The internal and external defect detection system based on PE heat preservation pipe machining according to claim 1, wherein the ultrasonic detection device comprises a plurality of ultrasonic detection units arranged along the axial direction of the PE heat preservation pipe, and each ultrasonic detection unit is provided with a plurality of ultrasonic probes; the ultrasonic detection unit comprises a first ultrasonic detection component and a second ultrasonic detection component, wherein the first ultrasonic detection component and the second ultrasonic detection component are in complementary circular arcs, one ends of the first ultrasonic detection component and the second ultrasonic detection component are connected in a rotating mode, and the other ends of the first ultrasonic detection component and the second ultrasonic detection component are connected in an opening and closing mode.
6. The PE thermal insulation pipe processing-based internal and external defect detection system according to claim 5, wherein the ultrasonic detection unit is in an on state when no detection is performed; when detection is carried out, the ultrasonic detection unit is in a closed state; when the ultrasonic detection unit is in the open state, the end points of the first ultrasonic detection part and the second ultrasonic detection part which are in open-close connection are disconnected, and the distance between the two end points is larger than the outer diameter of the PE heat insulation pipe; when the ultrasonic detection unit is in the closed state, the end points of the first ultrasonic detection component and the second ultrasonic detection component which are in open-close connection are closed, so that the ultrasonic detection unit is annular.
7. The system for detecting internal and external defects based on PE thermal insulation pipe processing according to claim 5, wherein the plurality of ultrasonic probes are equidistantly arranged along the inner peripheral surface of the annular ultrasonic detection unit, and the ultrasonic detection device further comprises a first adjusting unit and a second adjusting unit; the first adjusting unit is used for rotating the ultrasonic detection unit; the second adjusting unit is used for rotating the ultrasonic probe; the ultrasonic detection unit rotates by taking the axis of the ultrasonic detection unit as a rotating shaft; the ultrasonic probe rotates around an ultrasonic emission endpoint as a center along the circumferential direction of the ultrasonic detection unit.
8. The PE thermal insulation pipe processing-based internal and external defect detection system according to claim 7, wherein the number of probes of the ultrasonic probes is C, and the calculation formula of the number of probes C is:
；
Wherein, Representing the number of probes; /(I)Representing the vertical distance between an incident point and the incident diameter of the PE heat preservation pipe, wherein the incident diameter is parallel to the detection wave signal of the incident point; r represents the outer diameter of the PE heat-insulating pipe; g represents the shortest distance between the incident point and the outer surface of the PE heat preservation pipe; /(I)Representing the propagation speed of transverse waves in the PE heat-insulating pipe; /(I)Representing the propagation speed of the longitudinal wave in the detection liquid; r represents the inner diameter of the PE heat-insulating pipe.
9. The PE thermal insulation pipe processing-based internal and external defect detection system according to claim 8, wherein the calculation formula of the vertical distance X between the incident point and the incident diameter of the PE thermal insulation pipe is as follows:
；
Wherein, Representing the propagation velocity of the longitudinal wave in the PE insulating pipe.
10. The PE thermal insulation pipe processing-based internal and external defect detection system according to claim 7, wherein the number of probes of the ultrasonic probes is C, and the calculation formula of the number of probes C is:
；
Wherein, Representing maximum value; c represents the number of probes, which is greater than or equal to 4, and C is taken as the final number of probes when the maximum value is obtained; r represents the inner diameter of the PE heat-insulating pipe; r represents the outer diameter of the PE heat-insulating pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410438095.9A CN118032936B (en) | 2024-04-12 | Internal and external defect detection system based on PE heat preservation pipe processing |
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| CN202410438095.9A CN118032936B (en) | 2024-04-12 | Internal and external defect detection system based on PE heat preservation pipe processing |
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| CN118032936A true CN118032936A (en) | 2024-05-14 |
| CN118032936B CN118032936B (en) | 2024-06-21 |
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