Device and method for monitoring hidden dangers of stress concentration in direct-buried heating pipelines

Abstract

The present application relates to the technical field of pipeline defect detection, and in particular to a device and method for monitoring stress concentration hazards in directly buried heating pipelines, including a fluxgate sensor belt, the fluxgate sensor belt being connected to a power supply and a control system, a wireless signal transmitter being provided in the control system for connecting to a central control system, the fluxgate sensor belt being arranged above a connection point of the heating pipeline and above a bend of the heating pipeline, and the fluxgate sensor belt being buried underground, thereby achieving the effect of reducing the safety hazards caused by stress concentration in directly buried heating pipelines.

Description

Technical Field

[0001] The present application relates to the technical field of pipeline defect detection, and in particular to a device for monitoring stress concentration hazards in directly buried heating pipelines. Background Art

[0002] In northern my country, winter heating is provided by centralized heating. At the same time, urban construction is also proceeding rapidly. Heating pipe leakage failures often occur when construction workers are unclear about the laying of heating pipes, heating pipes are affected by changes in foundation cavities, heating pipes are aging, the foundation is not solid during pipe laying, the heating pipes have their own quality problems, welding is open at the connection parts, or the ground at the heating pipes is under heavy pressure.

[0003] Pipes buried directly underground will experience stress due to thermal expansion and contraction, and most of the stress will be concentrated at the welds and pipe turning locations. Stress concentration can cause damage to the heating pipes and lead to pipe leakage. The leaked hot water rushing out of the ground can easily cause safety accidents.

[0004] Most of the existing treatment measures are to repair the pipeline after it leaks, or to inspect the pipeline regularly, but they cannot eliminate the safety hazards in time after stress concentration occurs in the pipeline. Summary of the invention

[0005] In order to reduce the potential safety hazards caused by stress concentration in directly buried heating pipelines, the present application provides a device for monitoring potential safety hazards of stress concentration in directly buried heating pipelines.

[0006] The above technical objectives of this application are achieved through the following technical solutions:

[0007] A device for monitoring hidden dangers of stress concentration in directly buried heating pipelines comprises a fluxgate sensor belt, which is connected to a power supply and a control system. A wireless signal transmitter is arranged in the control system for connecting with a central control system. The fluxgate sensor belt is arranged above the connection of the heating pipeline and above the bending of the heating pipeline, and the fluxgate sensor belt is buried underground.

[0008] By adopting the above scheme, when the pipeline stress changes, the magnetism of the pipeline will change. The magnetic change of the pipeline is detected by the fluxgate sensor belt, and then the stress change of the pipeline is monitored. The fluxgate sensor belt transmits the magnetic signal to the control system, and then the control system sends it to the operator through the wireless signal transmitter, thereby realizing the monitoring of the pipeline, so that the operator can promptly inspect and repair the location where the stress change occurs in the heating pipeline.

[0009] Optionally, two fluxgate sensor strips are provided, both of which are located directly above the heating pipe, and one of the fluxgate sensor strips is located directly above the other fluxgate sensor strip, with a gap between the two fluxgate sensor strips.

[0010] By adopting the above scheme, the magnetic changes on the ground surface will also be monitored by the fluxgate sensor belt, which may affect the monitoring results of the fluxgate sensor belt. Therefore, two upper and lower fluxgate sensor belts are set. When the magnetic changes on the ground are received by the fluxgate sensor belt, since the upper fluxgate sensor belt is closer to the ground, the magnetic changes monitored by the upper fluxgate sensor belt should be greater than the magnetic changes monitored by the lower fluxgate sensor belt; when the magnetism of the pipeline changes, since the lower fluxgate sensor belt is closer to the pipeline, the magnetic changes monitored by the lower fluxgate sensor belt should be greater than the magnetic changes monitored by the upper fluxgate sensor belt. The above method can be used to distinguish whether the magnetic changes are caused by changes in pipeline stress, thereby making the detection results more accurate.

[0011] Optionally, the fluxgate sensor strip is connected to a mounting structure for mounting the fluxgate sensor strip on a pipeline.

[0012] By adopting the above solution, the fluxgate sensor belt needs to be installed just above the pipeline during installation, so a mounting structure is provided so that the fluxgate sensor belt can be quickly and accurately installed just above the heating pipeline.

[0013] Optionally, the mounting structure includes a fixing ring and a connecting rod, the fixing ring includes two semicircular rings, one end of the two semicircular rings is hinged, and the other end is provided with a clamping structure for closing the two semicircular rings, the connecting rod is fixedly connected to one of the semicircular rings, and the connecting rod is slidably connected to a connecting structure for connecting to a fluxgate sensor belt.

[0014] By adopting the above scheme, when installing the fluxgate sensor belt, two semicircular rings are used to surround the heating pipe, and the two semicircular rings are fixed by a clamping structure, and then the fluxgate sensor belt is connected to the connecting rod through the connecting structure, so that the fluxgate sensor belt is installed directly above the heating pipe.

[0015] Optionally, the clamping structure includes bolts and nuts, and a bolt seat is fixedly connected to the end of the semicircular ring away from the hinge, a through hole is opened on the surface of the bolt seat, the bolt passes through the through holes of the two bolt seats, and then the bolt is tightened by the nut.

[0016] By adopting the above solution, when the two semicircular rings are closed, bolts are passed through the two bolt seats and tightened with nuts, thereby fixing the two semicircular rings.

[0017] Optionally, the connecting structure includes a slider, a sliding hole is opened on the surface of the slider, the connecting rod passes through the sliding hole so that the slider is slidably connected to the connecting rod, and a groove is opened on the surface of the slider, a connecting block is fixedly connected to the end of the fluxgate sensor strip, the connecting block slides into the groove, and a connecting hole connected to the groove is opened on the inner circumferential surface of the sliding hole, a sliding rod is slidably connected in the connecting hole, and an arc rod is fixedly connected to one end of the sliding rod near the connecting rod, the sliding rod is inclined away from one end of the arc rod, and the inclined surface faces the notch direction of the groove, a spring cavity is opened in the connecting hole, a first spring is arranged in the spring cavity, one end of the first spring is fixedly connected to the surface of the spring cavity, and the other end of the first spring is fixedly connected to the sliding rod, when the connecting block slides into the groove, the connecting block contacts the inclined surface of the sliding rod and presses the inclined end of the sliding rod into the connecting hole, and makes the arc rod abut against the surface of the connecting rod.

[0018] By adopting the above scheme, the slider slides on the connecting rod to adjust the distance between the fluxgate sensor belt and the pipeline, and then the connecting block slides into the groove, the connecting block contacts the inclined surface of the sliding rod, thereby driving the sliding rod to slide toward the connecting rod, so that the arc rod abuts against the surface of the connecting rod, so that the slider is fixed on the connecting rod, thereby connecting the fluxgate sensor belt directly above the pipeline.

[0019] Optionally, a pin groove is provided on the inner side plate of the groove, a bayonet pin is slidably connected in the pin groove, and a pin spring is fixedly connected to the bottom of the pin groove, the pin spring is fixedly connected to the bayonet pin, and the bayonet pin is inclined away from one end of the pin spring, and the inclined surface of the pin spring faces the notch of the groove, and a bayonet groove is provided on the surface of the connecting block. When the connecting block slides completely into the groove, the bayonet groove is opposite to the pin groove, and the inclined end of the bayonet pin is inserted into the bayonet groove.

[0020] By adopting the above scheme, the connecting block is placed in the groove, the connecting block contacts the inclined surface of the bayonet pin, and one side of the inclined surface of the bayonet pin is pressed into the pin groove until the connecting block is completely placed in the groove, and the pin spring rebounds to drive the bayonet pin into the slot, thereby clamping the connecting block in the groove, so that the fluxgate sensor belt is installed more stably.

[0021] Optionally, the sliding block is provided with a threaded hole on one side of the groove, and a threaded rod is threadedly connected to the threaded hole, and the threaded hole is connected to the pin groove, and a bevel hole is provided on the circumferential surface of the pin. When the threaded rod is screwed into the pin groove, the threaded rod abuts against the bevel of the bevel groove, and the threaded rod drives the pin to move in the direction of the compression pin spring.

[0022] By adopting the above scheme, when the non-contact magnetic induction probe needs to be removed, the threaded rod is screwed into the threaded hole, thereby driving the bayonet to move in the direction of the compression spring, so that the bayonet slides out of the slot, and the connecting block can slide out of the groove, thereby removing the fluxgate sensor belt.

[0023] Optionally, the threaded rod has a spherical shape at one end close to the pin.

[0024] By adopting the above solution, the threaded rod can press the bayonet pin into the pin groove more smoothly.

[0025] The present application also discloses a monitoring method of a device for monitoring hidden dangers of stress concentration in a directly buried heating pipeline, comprising the following steps:

[0026] S1. Install the fluxgate sensor belt just above the heating pipe, connect the fluxgate sensor belt to the power supply and control system through wires, and fix the control system and power supply on the ground;

[0027] S2, fluxgate sensor belt detects surrounding electromagnetic information and transmits the electromagnetic information to the control system;

[0028] S3, the control system transmits the collected electromagnetic information to the central control system through a wireless signal transmitter;

[0029] S4. The central control system compares the information collected multiple times and detects the change in information to determine whether there is a risk of excessive stress in the heating pipeline.

[0030] In summary, this application has the following technical effects:

[0031] 1. By setting a fluxgate sensor belt above the heating pipeline and connecting the fluxgate sensor belt to the control system, the operator can detect the stress change of the pipeline through the weak magnetic change of the pipeline detected by the fluxgate sensor belt, so that the operator can timely inspect and repair the heating pipeline with potential safety hazards;

[0032] 2. The monitoring results of the monitoring device are more accurate by setting up two fluxgate sensor belts;

[0033] 3. The installation structure enables operators to more smoothly install the fluxgate sensor belt directly above the heating pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of this application;

[0035] Figure 2 It is a schematic diagram of another perspective of the overall structure of the present application;

[0036] Figure 3 This is a schematic diagram of a part of the structure of the slider that this application intends to emphasize;

[0037] Figure 4 This is a cross-sectional view of the part of the structure where the slide bar is intended to be emphasized in this application;

[0038] Figure 5 This is a partial structural diagram of the present application intended to emphasize the latch.

[0039] In the figure, 1, fluxgate sensor belt; 2, control system; 3, fixing ring; 4, connecting rod; 5, slider; 51, sliding hole; 52, groove; 53, connecting block; 531, slot; 54, sliding rod; 541, arc rod; 542, first spring; 55, connecting hole; 56, pin slot; 57, threaded hole; 58, threaded rod; 8, bayonet pin; 81, pin spring; 9, heating pipe. DETAILED DESCRIPTION

[0040] The present application is further described in detail below with reference to the accompanying drawings.

[0041] Reference Figure 1 and Figure 2 , a stress concentration hidden danger monitoring device for directly buried heating pipelines, including a fluxgate sensor belt 1, the fluxgate sensor belt 1 is connected to a power supply and a control system 2, a wireless signal transmitter is arranged in the control system 2 for connecting with a central control system, and the fluxgate sensor belt 1 is arranged above the connection of the heating pipeline 9 and above the bending of the heating pipeline 9, and the fluxgate sensor belt 1 is buried underground. The principle of the metal magnetic memory detection method is to use the irreversible change of the magnetic field state generated in the stress and deformation area of ​​the ferromagnetic workpiece during the load working process. In this area, the magnetic domain organization with magnetostrictive properties is directional and irreversibly reoriented, and this irreversible change of the magnetic field state will not only be retained after the working load is eliminated, but also has a certain connection with the maximum applied stress. Therefore, when the pipeline stress changes, the magnetism of the pipeline will change. The magnetic change of the pipeline is detected by the fluxgate sensor belt 1, and then the stress change of the pipeline is monitored. The fluxgate sensor belt 1 transmits the magnetic signal to the control system 2, and then the control system 2 sends it to the operator through the wireless signal transmitter, thereby realizing the monitoring of the pipeline, so that the operator can timely inspect and repair the location where the stress change occurs in the heating pipeline 9.

[0042] The fluxgate sensor belt 1 includes a belt body and a three-axis fluxgate probe, and each belt body is 300 cm long. There are multiple three-axis fluxgate probes, and the multiple fluxgate probes are evenly arranged on the surface of the belt body, and two adjacent fluxgate probes are 10 cm apart.

[0043] Reference Figure 1 and Figure 2There are two fluxgate sensor belts 1, both of which are located directly above the heating pipe 9, and one of the fluxgate sensor belts 1 is located directly above the other fluxgate sensor belt 1, and there is a gap between the two fluxgate sensor belts 1. The fluxgate sensor belt 1 located at the bottom is less than 120 cm away from the heating pipe 9, and the fluxgate sensor belt 1 located at the top should be more than 120 cm away from the ground surface. The weak magnetic changes on the ground surface will also be detected by the fluxgate sensor belt 1, which may affect the monitoring results of the fluxgate sensor belt 1. For example, if there are vehicles parked on the ground, the weak magnetic field detected by the fluxgate sensor belt 1 will change significantly. Therefore, two upper and lower fluxgate sensor belts 1 are set. When the magnetic changes on the ground are detected by the fluxgate sensor belt 1, since the upper fluxgate sensor belt 1 is closer to the ground, the magnetic changes monitored by the upper fluxgate sensor belt 1 should be greater than the magnetic changes monitored by the lower fluxgate sensor belt 1; when the magnetism of the pipeline changes, since the lower fluxgate sensor belt 1 is closer to the pipeline, the magnetic changes monitored by the lower fluxgate sensor belt 1 should be greater than the magnetic changes monitored by the upper fluxgate sensor belt 1. The above method can be used to distinguish whether the magnetic changes are caused by changes in pipeline stress, thereby making the monitoring results more accurate.

[0044] Reference Figure 2 , the fluxgate sensor belt 1 is connected with a mounting structure for mounting the fluxgate sensor belt 1 on the pipeline. The mounting structure includes a fixing ring 3 and a connecting rod 4. The fixing ring 3 includes two semicircular rings, one end of the two semicircular rings is hinged, and the other end is provided with a clamping structure for closing the two semicircular rings. The connecting rod 4 is fixedly connected to one of the semicircular rings, and the connecting rod 4 is slidably connected with a connecting structure for connecting with the fluxgate sensor belt 1. The clamping structure includes bolts and nuts. A bolt seat is fixedly connected to the end of the semicircular ring away from the hinge. A through hole is provided on the surface of the bolt seat. The bolt passes through the through holes of the two bolt seats, and then the bolt is tightened by the nut. When installing the fluxgate sensor belt 1, the fluxgate sensor belt 1 needs to be installed directly above the pipeline, and the heating pipeline 9 is surrounded by two semicircular rings. The bolts are passed through the two bolt seats and tightened by the nut, so as to fix the two semicircular rings. Then, the fluxgate sensor belt 1 is connected to the connecting rod 4 through the connecting structure, so that the fluxgate sensor belt 1 is installed directly above the heating pipe 9, so that the fluxgate sensor belt 1 can be quickly and accurately installed directly above the heating pipe 9.

[0045] Reference Figure 3 and Figure 4The connection structure includes a slider 5, a sliding hole 51 is provided on the surface of the slider 5, the connecting rod 4 passes through the sliding hole 51 so that the slider 5 is slidably connected to the connecting rod 4, and a groove 52 is provided on the surface of the slider 5, a connecting block 53 is fixedly connected to the end of the fluxgate sensor strip 1, the connecting block 53 slides into the groove 52, a connecting hole 55 connected to the groove 52 is provided on the inner circumferential surface of the sliding hole 51, a sliding rod 54 is slidably connected in the connecting hole 55, and an arc rod 541 is fixedly connected to the end of the sliding rod 54 near the connecting rod 4, and the sliding rod One end of 54 is inclined away from the arc rod 541, and the inclined surface is facing the notch direction of the groove 52. A spring cavity is opened in the connecting hole 55, and a first spring 542 is arranged in the spring cavity. One end of the first spring 542 is fixedly connected to the surface of the spring cavity, and the other end of the first spring 542 is fixedly connected to the slide rod 54. When the connecting block 53 slides into the groove 52, the connecting block 53 contacts the inclined surface of the slide rod 54 and presses the inclined end of the slide rod 54 into the connecting hole 55, and makes the arc rod 541 abut against the surface of the connecting rod 4.

[0046] Reference Figure 3 and Figure 4 , the slider 5 slides on the connecting rod 4 to adjust the distance between the fluxgate sensor strip 1 and the pipeline, and then the connecting block 53 slides into the groove 52, the connecting block 53 contacts the inclined surface of the slide rod 54, thereby driving the slide rod 54 to slide toward the connecting rod 4, so that the arc rod 541 abuts against the surface of the connecting rod 4, so that the slider 5 is fixed on the connecting rod 4, thereby connecting the fluxgate sensor strip 1 directly above the pipeline.

[0047] Reference Figure 3 and Figure 5 The inner plate of the groove 52 is provided with a pin groove 56, in which a bayonet 8 is slidably connected, and a pin spring 81 is fixedly connected to the bottom of the pin groove 56, and the pin spring 81 is fixedly connected to the bayonet 8, and the bayonet 8 is inclined at one end away from the pin spring 81, and the inclined surface of the pin spring 81 faces the notch of the groove 52, and a bayonet 531 is provided on the surface of the connecting block 53, when the connecting block 53 is completely slid into the groove 52, the bayonet 531 is directly opposite to the pin groove 56, and the inclined end of the bayonet 8 is inserted into the bayonet 531. The connecting block 53 is placed in the groove 52, the connecting block 53 contacts the inclined surface of the bayonet 8, and one side of the inclined surface of the bayonet 8 is pressed into the pin groove 56, until the connecting block 53 is completely placed in the groove 52, the pin spring 81 rebounds and drives the bayonet 8 to be inserted into the bayonet 531, so that the connecting block 53 is stuck in the groove 52, so that the fluxgate sensor belt 1 is installed more firmly.

[0048] Reference Figure 3 and Figure 5The slider 5 is provided with a groove 52 and a threaded hole 57 on one side, and a threaded rod 58 is connected to the threaded hole 57. The end of the threaded rod 58 near the bayonet 8 is spherical, and the threaded hole 57 is connected to the pin groove 56. A chamfered hole is provided on the circumferential surface of the bayonet 8. When the threaded rod 58 is screwed into the pin groove 56, the threaded rod 58 abuts against the chamfered surface of the chamfered surface groove, and the threaded rod 58 drives the bayonet 8 to move in the direction of the compression pin spring 81. When the non-contact magnetic induction probe needs to be removed, the threaded rod 58 is screwed into the threaded hole 57, thereby driving the bayonet 8 to move in the direction of the compression spring, so that the bayonet 8 slides out of the slot 531, and the connecting block 53 can slide out of the groove 52, thereby removing the fluxgate sensor belt 1.

[0049] The present application also discloses a monitoring method of a device for monitoring hidden dangers of stress concentration in a directly buried heating pipeline, comprising the following steps:

[0050] S1. Put two semicircular rings on the connection or the outer side of the bend of the heating pipe 9 and fix them with bolts and nuts;

[0051] Slide the slider 5 on the connecting rod 4 to determine the pre-installation position of the slider 5, and ensure that the distance between the fluxgate sensor belt 1 and the heating pipe 9 and the two fluxgate sensor belts 1 is sufficient;

[0052] Slide the connecting block 53 into the groove 52, fix the slider 5 on the connecting rod 4, and fix the connecting block 53 in the groove 52 through the bayonet 8, so as to fix the fluxgate sensor belt 1, connect the fluxgate sensor belt 1 to the power supply and the control system 2 through the wire, and fix the control system 2 and the power supply on the ground surface;

[0053] S2, fluxgate sensor belt 1 indirectly detects surrounding electromagnetic information and transmits the electromagnetic information to control system 2;

[0054] S3, control system 2 transmits the collected electromagnetic information to the central control system through a wireless signal transmitter;

[0055] S4. The central control system compares the information collected multiple times and detects the change in the information to determine whether the heating pipeline 9 has a risk of excessive stress.

[0056] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A device for monitoring hidden dangers of stress concentration in direct buried heating pipelines, characterized by: The invention comprises a fluxgate sensor belt (1), the fluxgate sensor belt (1) is connected to a power supply and a control system (2), a wireless signal transmitter is arranged in the control system (2) for connecting with a central control system, the fluxgate sensor belt (1) is arranged above the connection of the heating pipeline (9) and above the bending part of the heating pipeline (9), and the fluxgate sensor belt (1) is buried underground; Two fluxgate sensor strips (1) are provided, and both fluxgate sensor strips (1) are located directly above the heating pipe (9), and one fluxgate sensor strip (1) is located directly above the other fluxgate sensor strip (1), and there is a gap between the two fluxgate sensor strips (1); The fluxgate sensor strip (1) is connected to a mounting structure for mounting the fluxgate sensor strip (1) on a pipeline; The mounting structure comprises a fixing ring (3) and a connecting rod (4), wherein the fixing ring (3) comprises two semicircular rings, one end of the two semicircular rings is hinged, and the other end is provided with a clamping structure for closing the two semicircular rings, the connecting rod (4) is fixedly connected to one of the semicircular rings, and the connecting rod (4) is slidably connected to a connecting structure for connecting to the fluxgate sensor strip (1); The connection structure comprises a slider (5), a sliding hole (51) is provided on the surface of the slider (5), a connecting rod (4) passes through the sliding hole (51) so that the slider (5) and the connecting rod (4) are slidably connected, and a groove (52) is provided on the surface of the slider (5), a connecting block (53) is fixedly connected to the end of the fluxgate sensor strip (1), the connecting block (53) slides into the groove (52), a connecting hole (55) connected to the groove (52) is provided on the inner circumferential surface of the sliding hole (51), a sliding rod (54) is slidably connected in the connecting hole (55), and an arc rod (54) is fixedly connected to one end of the sliding rod (54) close to the connecting rod (4). 1), one end of the slide bar (54) is inclined away from the arc-shaped rod (541), and the inclined surface faces the notch direction of the groove (52), a spring cavity is opened in the connecting hole (55), a first spring (542) is arranged in the spring cavity, one end of the first spring (542) is fixedly connected to the surface of the spring cavity, and the other end of the first spring (542) is fixedly connected to the slide bar (54), when the connecting block (53) slides into the groove (52), the connecting block (53) contacts the inclined surface of the slide bar (54) and presses the inclined end of the slide bar (54) into the connecting hole (55), and makes the arc-shaped rod (541) abut against the surface of the connecting rod (4).

2. The device for monitoring stress concentration hazards of direct buried heating pipelines according to claim 1 is characterized in that: The clamping structure includes bolts and nuts. A bolt seat is fixedly connected to the end of the semicircular ring away from the hinge. A through hole is opened on the surface of the bolt seat. The bolt passes through the through holes of the two bolt seats and is then tightened by the nut.

3. The device for monitoring stress concentration hazards of direct buried heating pipelines according to claim 1 is characterized in that: The inner side plate of the groove (52) is provided with a pin groove (56), a bayonet (8) is slidably connected in the pin groove (56), and a pin spring (81) is fixedly connected to the bottom of the pin groove (56), the pin spring (81) is fixedly connected to the bayonet (8), and the bayonet (8) is inclined at one end away from the pin spring (81), and the inclined surface of the bayonet (8) faces the notch of the groove (52), and a bayonet groove (531) is provided on the surface of the connecting block (53), when the connecting block (53) completely slides into the groove (52), the bayonet groove (531) faces the pin groove (56), and the inclined end of the bayonet (8) is inserted into the bayonet groove (531).

4. The device for monitoring stress concentration hazards of direct buried heating pipelines according to claim 3 is characterized in that: The slider (5) is provided with a groove (52) and a threaded hole (57) on one side thereof, and a threaded rod (58) is connected to the threaded hole (57) through a thread, and the threaded hole (57) is communicated with the pin groove (56), and an inclined groove is provided on the circumferential surface of the bayonet (8), and when the threaded rod (58) is screwed into the pin groove (56), the threaded rod (58) abuts against the inclined surface of the inclined groove, and the threaded rod (58) drives the bayonet (8) to move in the direction of the compression pin spring (81).

5. The device for monitoring stress concentration hazards of direct buried heating pipelines according to claim 4 is characterized in that: The threaded rod (58) is spherical at one end close to the bayonet pin (8).

Images