A leak detection and repair device for inner wall coated steel pipe

Abstract

The present invention relates to a device for detecting and repairing leaks in inner wall coated steel pipes, comprising a body, an inner support plate, a rotating member, a detection brush, and a plurality of groups of running wheels, and also comprising a spray head and a powder supply device. The rotating member has at least two mounting arms, and the detection brush and the spray head are respectively arranged at the ends of the two mounting arms. A fixed pipe is arranged on the inner support plate, and the end of the rotating member is sleeved on the fixed pipe and can rotate relative to the fixed pipe. A powder spraying pipeline for connecting the spray head and the fixed pipe is arranged in the rotating member, and the other end of the fixed pipe is connected to the powder supply device through a powder supply pipe. The present invention arranges a detection brush and a spray head on the rotating member, and when the detection brush detects a coating leak, the spray head then rotates to the leak position to spray and repair, thereby realizing the dual functions of detection and repair; the running wheel adjusts the distribution circumferential diameter through the deformation of the movable bracket, so that the device can be applied to steel pipes of different diameters, thereby improving the utilization rate of the device.

Description

Technical Field

[0001] The invention relates to the technical field of steel pipe coating detection equipment, and in particular to a leakage point detection and repair device for an inner wall coated steel pipe. Background Art

[0002] After the steel pipe anti-corrosion coating production line is finished, the leak points on the coating need to be inspected to ensure the coating quality. At present, general detection uses the electric spark method, which is to use a high-voltage generator to generate high voltage, ground the zero side of the high-voltage generator and connect it to the metal surface of the steel pipe, and then the high-voltage side passes through the coating. When it passes through the leak point, the coating is broken down by the high voltage, and an alarm is issued to achieve the detection purpose.

[0003] For example, the Chinese utility model patent with application number 201320671888.2 discloses an inspection vehicle for internal joint coating of steel pipes, wherein a driving wheel and a driven wheel are arranged at the bottom of the vehicle body cover, a rotating insulating plate bracket and a rotating insulating plate are arranged in the head cover, and two single-ear connecting rods are arranged in the slide groove of the rotating insulating plate, one end of one single-ear connecting rod is clamped by a detection brush holder to hold an electric spark leak detection brush, and the other end is connected to a through-screw, and one end of the other single-ear connecting rod is connected to a thickness measuring probe holder through a connecting rod, a thickness measuring probe is arranged on the thickness measuring probe holder, and the other end is connected to the through-screw, which fixes the through-screw stepping motor; a miniature camera is arranged on the camera bracket, the through-screw stepping motor is connected to the shaft, and the head cover is connected to the rotating stepping motor in the vehicle body cover. The disadvantage is that the inspection vehicle can only detect whether there are leaks in the coating, but cannot repair the leaks. Summary of the invention

[0004] The purpose of the present invention is to provide a leakage detection and repair device for inner wall coated steel pipes, so as to solve the problem that the detection vehicle in the prior art has a single function and cannot repair the leakage.

[0005] The above-mentioned object of the present invention is achieved through the following technical scheme: a device for detecting and repairing leaks in inner wall coated steel pipes, comprising a body, an inner supporting plate arranged at the end of the body, a rotating part installed on the inner supporting plate, a detection brush fixed on the rotating part, and a plurality of groups of running wheels distributed along the circumference of the body, and also comprising a nozzle and a powder supply device, wherein the rotating part has at least two mounting arms, and the detection brush and the nozzle are respectively arranged at the ends of the two mounting arms, a fixed connecting pipe is arranged on the inner supporting plate, and the end of the rotating part is sleeved on the fixed connecting pipe and can rotate relative to the fixed connecting pipe, and a powder spraying pipeline for connecting the nozzle and the fixed connecting pipe is arranged in the rotating part, and the other end of the fixed connecting pipe is connected to the powder supply device through a powder supply pipe.

[0006] Preferably, the rotating member includes a rotating shaft and a first mounting arm and a second mounting arm fixed to the same end of the rotating shaft, the rotating shaft and the second mounting arm are hollow structures and are connected to each other, the detection brush is arranged at the end of the first mounting arm, and the nozzle is arranged at the end of the second mounting arm.

[0007] Preferably, the rotating shaft, the first mounting arm and the second mounting arm are arranged in a T shape, and the first mounting arm and the second mounting arm are located in the same rotating circle.

[0008] The rotating part has a T-shaped structure, and the detection brush and the nozzle are symmetrically distributed relative to the rotation axis, so that the distribution of the rotational inertia of the rotating part is more balanced, reducing the vibration of the vehicle body during detection.

[0009] Preferably, an outer cover is provided on the outer side of the nozzle, and an electric heating element is provided inside the outer cover.

[0010] Preferably, the second mounting arm is a telescopic structure, and the end of the outer cover is brought into contact with or separated from the inner wall of the steel pipe through the telescopic movement of the second mounting arm.

[0011] Preferably, the second mounting arm includes a fixed tube arm and a movable tube arm, the fixed tube arm is fixedly connected to the rotating shaft, the movable tube arm is sleeved on the outside of the fixed tube arm and can move axially relative to the fixed tube arm, and a movable valve head is arranged in the movable tube arm, the movable valve head is arranged at the pipe mouth of the fixed tube arm and a part of it extends into the fixed tube arm, and the extension and retraction of the second mounting arm is controlled by the axial movement of the movable valve head.

[0012] Preferably, the movable valve head is fixed in the movable tube arm, a gap for powder to pass through is provided between the outer side of the movable valve head and the inner wall of the movable tube arm, and a return spring is connected between the movable tube arm and the fixed tube arm.

[0013] During repair, the powder supply device passes the coating powder into the powder spraying pipeline through high-pressure gas. When entering the fixed tube arm, the airflow pushes the movable valve head to move under the action of pressure, and drives the movable tube arm to move, so that the second mounting arm is extended and the end of the outer cover is against the inner wall of the steel pipe. At the same time, the fixed tube arm is connected with the movable tube arm, and the powder enters the movable tube arm from the gap between the movable valve head and the inner wall of the movable tube arm and is sprayed out from the nozzle to complete the repair. Under the protection of the outer cover, the powder will not be sprayed to other parts, but will only be concentrated in the repair area. After the repair is completed, the movable tube arm is reset under the action of the reset spring, so that the end of the outer cover leaves the inner wall of the steel pipe to prevent the coating from being scratched during the inspection process.

[0014] Preferably, a movable bracket for mounting the running wheels is provided on the vehicle body, and the movable bracket adjusts the distributed circumferential diameter of the running wheels through axial deformation.

[0015] Preferably, the movable bracket comprises two support rods which are cross-arranged and hinged to each other, and a movable sliding sleeve is installed on the vehicle body, one end of one of the support rods is hinged to the vehicle body, and a traveling wheel is installed on the other end; one end of the other support rod is hinged to the sliding sleeve, and another traveling wheel is installed on the other end.

[0016] When the sleeve moves, the distance between the front and rear running wheels changes, and at the same time, the distance between the center of the running wheel guide body also changes accordingly, that is, the distributed circumferential diameter of the running wheels changes, so that it is suitable for steel pipes with different diameters.

[0017] Preferably, an adjusting member for adjusting the moving position of the sliding sleeve is provided on the vehicle body, the adjusting member is provided on one side of the sliding sleeve and is screwed on the vehicle body, and the adjusting member is moved axially along the vehicle body by rotating the adjusting member.

[0018] The present invention has the following beneficial effects:

[0019] 1. The present invention arranges a detection brush and a nozzle on the rotating part. When the detection brush detects a coating leak, the nozzle then rotates to the leak position to spray and repair, thereby realizing the dual functions of detection and repair;

[0020] 2. The rotating part is T-shaped, and the detection brush and the nozzle are symmetrically distributed relative to the rotation axis, so that the rotational inertia distribution of the rotating part is more balanced, reducing the vibration of the car body during detection;

[0021] 3. The walking wheel adjusts the distribution circle diameter through the deformation of the movable bracket, so that the device can be applied to steel pipes with different diameters, thereby improving the utilization rate of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0023] Figure 2 is a schematic structural diagram of a rotating member in an embodiment of the present invention;

[0024] Figure 3 It is a schematic diagram of the use state of the present invention in a steel pipe;

[0025] In the figure: 1-body, 2-inner bearing plate, 3-rotating member, 301-rotating shaft, 302-first mounting arm, 303-second mounting arm, 3031-fixed pipe arm, 3032-movable pipe arm, 3033-movable valve head, 3034-reset spring, 304-powder spraying pipeline, 4-detection brush, 5-spray head, 6-outer cover, 601-electric heating element, 7-fixed pipe, 8-support rod, 9-sleeve, 10-adjusting member, 11-traveling wheel, 12-powder supply pipe, 13-powder supply device. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0027] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0028] Example: Figure 1 and Figure 2 As shown, a device for detecting and repairing leaks of inner wall coated steel pipes comprises a body 1, an inner support plate 2, a rotating member 3, a detection brush 4, a nozzle 5 and a powder supply device 13. The body 1 is a columnar structure, and the inner support plate 2 is fixed to the end of the body 1. The detection brush 4 and the nozzle 5 are fixedly mounted on the rotating member 3, and the rotating member 3 is mounted on the inner support plate 2 and driven to rotate by a micro motor located inside the inner support plate 2.

[0029] like Figure 1 As shown, the vehicle body 1 is provided with a movable bracket for mounting a running wheel 11, and three groups of movable brackets are provided, and the three groups of movable brackets are distributed along the center line circumference of the vehicle body 1. The movable bracket adjusts the distribution circumferential diameter of the running wheel 11 by axial deformation. The movable bracket includes two support rods 8 arranged in a cross shape and hinged to each other, and a sliding sleeve 9 is installed on the vehicle body 1. The sliding sleeve 9 is sleeved on the vehicle body 1 and can move axially along the vehicle body 1. One end of one of the support rods 8 is hinged on the vehicle body 1, and a running wheel 11 is installed on the other end; one end of the other support rod 8 is hinged on the sliding sleeve 9, and another running wheel 11 is installed on the other end. The two running wheels 11 are distributed front and back along the axial direction of the vehicle body. The vehicle body 1 is provided with an adjusting member 10 for adjusting the moving position of the sliding sleeve 9. The adjusting member 10 is a nut, which is screwed on the vehicle body 1 and located on one side of the sliding sleeve 9. The adjusting member 10 is moved axially along the vehicle body 1 by rotating the adjusting member 10.

[0030] The traveling wheel 11 can be an unpowered roller or a powered roller. When an unpowered roller is used, the vehicle body 1 is manually pulled forward; when a powered roller is used, the vehicle body 1 is driven forward by the powered roller.

[0031] The rotating member 3 has at least two mounting arms, which can be equipped with multiple detection brushes 4 and nozzles 5. In this embodiment, there are two mounting arms, including a first mounting arm 302 and a second mounting arm 303. The detection brush 4 is fixedly mounted at the end of the first mounting arm 302 and connected to the corresponding electric spark detector through a wire. The nozzle 5 is fixedly mounted at the end of the second mounting arm 303. The rotating member 3 also includes a rotating shaft 301, and the ends of the first mounting arm 302 and the second mounting arm 303 are respectively fixed on the rotating shaft 301, so that the first mounting arm 302, the second mounting arm 303 and the rotating shaft 301 are distributed in a T shape, and the detection brush 4 and the nozzle 5 are symmetrically distributed on both sides of the rotating shaft 301. The first mounting arm 302 and the second mounting arm 303 both rotate along the axis of the rotating shaft 301, and both are located in the same rotating circle.

[0032] A fixed pipe 7 is provided on the inner supporting plate 2, and the fixed pipe 7 is fixed inside the inner supporting plate 2. The rotating shaft 301 of the rotating member 3 is sleeved on the fixed pipe 7 and can rotate relative to the fixed pipe 7. A powder spraying pipeline 304 is provided in the rotating member 3, and the powder spraying pipeline 304 connects the nozzle 5 and the fixed pipe 7. Among them, the rotating shaft 301 and the second mounting arm 303 are hollow structures and are connected to each other, so as to form a powder spraying pipeline 304. The other end of the fixed pipe 7 is connected to a powder supply pipe 12, and the powder supply pipe 12 extends through the vehicle body 1 to the outside of the vehicle body 1, and is connected to the powder supply device 13 on the outside. The powder supply device 13 includes a powder storage tank and an air compressor for increasing the power in the powder storage tank.

[0033] An outer cover 6 is arranged outside the nozzle 5, and the outer cover 6 is fixed to the end of the second mounting arm 303. An electric heating element 601 is arranged inside the outer cover 6. The electric heating element 601 is an electric heating wire, which heats the powder in the area covered by the outer cover 6 when powered on.

[0034] like Figure 2 As shown, the second mounting arm 303 is a telescopic structure, and the end of the outer cover 6 is brought into contact with or separated from the inner wall of the steel pipe by the telescopic movement of the second mounting arm 303. The second mounting arm 303 includes a fixed pipe arm 3031 and a movable pipe arm 3032, wherein the fixed pipe arm 3031 is fixedly connected to the rotating shaft 301, and the movable pipe arm 3032 is sleeved on the outer side of the fixed pipe arm 3031 and can move axially relative to the fixed pipe arm 3031.

[0035] A movable valve head 3033 is arranged in the movable arm 3032. The movable valve head 3033 is fixed in the movable arm 3032. There is a gap between the outer side of the movable valve head 3033 and the inner wall of the movable arm 3032 for powder to pass through. The movable valve head 3033 is located at the pipe mouth of the fixed arm 3031 and a part of it extends into the fixed arm 3031. Its front end is a conical structure, so as to easily extend into the fixed arm 3031. When not spraying powder, the movable valve head 3033 is blocked at the pipe mouth of the fixed arm 3031; when spraying, the movable valve head 3033 is pushed by the airflow and powder and withdraws from the pipe mouth of the fixed arm 3031, so that the airflow and powder enter the movable arm 3032 and spray out of the nozzle 5. In this process, the axial movement of the movable valve head 3033 drives the extension of the second mounting arm 303.

[0036] A return spring 3034 is connected between the movable tube arm 3032 and the fixed tube arm 3031. The return spring 3034 is sleeved on the fixed tube arm 3031, one end of which is fixedly connected to the end of the movable tube arm 3032, and the other end is fixedly connected to the fixed tube arm 3031. When the spraying is completed, the extended second mounting arm 303 retracts under the action of the return spring 3034, and the movable valve head 3033 is blocked at the tube mouth of the fixed tube arm 3031 again, and at the same time, the end of the outer cover 6 leaves the inner wall of the steel pipe.

[0037] like Figure 3 As shown, before the test, the vehicle body 1 is placed in the steel pipe to be tested, and the adjusting member 10 is rotated so that the circumferentially distributed running wheels 11 are against the inner wall of the steel pipe. During the test, the vehicle body 1 moves in the steel pipe, and the rotating member 3 rotates at the same time, so that the detection brush 4 scans the coating on the inner wall of the steel pipe in a spiral manner. When a coating leak is detected, the spark detector located outside the steel pipe feeds back the detected position data to the PLC controller. Under the control of the PLC controller, the vehicle body 1 stops moving, and the rotating member 3 rotates 180°, so that the nozzle 5 rotates to the leak position, and controls the powder supply device 13 outside the steel pipe to operate. Under the action of the high-pressure airflow, the second mounting arm 303 extends, and the outer cover 6 covers the leak position. At the same time, the nozzle 5 sprays powder to the leak position, and the electric heating element 601 of the outer cover 6 generates high temperature to heat the powder, completing the coating leak repair.

Claims

1. A device for detecting and repairing leaks in inner wall coated steel pipes, comprising a body (1), an inner support plate (2) arranged at an end of the body (1), a rotating member (3) mounted on the inner support plate (2), a detection brush (4) fixed on the rotating member (3), and a plurality of groups of running wheels (11) distributed along the circumference of the body (1), characterized in that: It also includes a spray head (5) and a powder supply device (13), wherein the rotating member (3) has at least two mounting arms, the detection brush (4) and the spray head (5) are respectively arranged at the ends of the two mounting arms, the inner support plate (2) is provided with a fixed pipe (7), the end of the rotating member (3) is sleeved on the fixed pipe (7) and can rotate relative to the fixed pipe (7), the rotating member (3) is provided with a powder spraying pipeline (304) for connecting the spray head (5) and the fixed pipe (7), and the other end of the fixed pipe (7) is connected to the powder supply device (13) through a powder supply pipe (12); The rotating member (3) comprises a rotating shaft (301) and a first mounting arm (302) and a second mounting arm (303) fixed to the same end of the rotating shaft (301); the rotating shaft (301) and the second mounting arm (303) are hollow structures and are interconnected; the detection brush (4) is arranged at the end of the first mounting arm (302); and the nozzle (5) is arranged at the end of the second mounting arm (303); The second mounting arm (303) is a telescopic structure, and the end of the outer cover (6) is brought into contact with or separated from the inner wall of the steel pipe through the telescopic movement of the second mounting arm (303); The second installation arm (303) comprises a fixed tube arm (3031) and a movable tube arm (3032), wherein the fixed tube arm (3031) is fixedly connected to the rotating shaft (301), the movable tube arm (3032) is sleeved on the outside of the fixed tube arm (3031) and can move axially relative to the fixed tube arm (3031), and a movable valve head (3033) is arranged in the movable tube arm (3032), and the movable valve head (3033) is arranged at the tube mouth of the fixed tube arm (3031) and a part of the movable valve head (3033) extends into the fixed tube arm (3031), and the extension and retraction of the second installation arm (303) is controlled by the axial movement of the movable valve head (3033); The movable valve head (3033) is fixedly connected in the movable tube arm (3032); a gap is provided between the outer side of the movable valve head (3033) and the inner wall of the movable tube arm (3032) for powder to pass through; a return spring (3034) is connected between the movable tube arm (3032) and the fixed tube arm (3031); The rotating shaft (301), the first mounting arm (302) and the second mounting arm (303) are arranged in a T-shape, and the first mounting arm (302) and the second mounting arm (303) are located within the same rotating circle; An outer cover (6) is arranged on the outside of the spray head (5), and an electric heating element (601) is arranged inside the outer cover (6).

2. The inner wall coated steel pipe leak detection and repair device according to claim 1, characterized in that: The vehicle body (1) is provided with a movable bracket for mounting the running wheel (11), and the movable bracket adjusts the distribution circumferential diameter of the running wheel (11) through axial deformation.

3. The inner wall coated steel pipe leak detection and repair device according to claim 2, characterized in that: The movable bracket comprises two support rods (8) arranged in a cross shape and hinged to each other, and a movable sliding sleeve (9) is installed on the vehicle body (1), one end of one of the support rods (8) is hinged to the vehicle body (1), and a running wheel (11) is installed on the other end; one end of the other support rod (8) is hinged to the sliding sleeve (9), and another running wheel (11) is installed on the other end.

4. The device for detecting and repairing leaks in inner wall coated steel pipes according to claim 3, characterized in that: The vehicle body (1) is provided with an adjusting member (10) for adjusting the moving position of the sliding sleeve (9); the adjusting member (10) is arranged on one side of the sliding sleeve (9) and is screwed onto the vehicle body (1); the adjusting member (10) is moved axially along the vehicle body (1) by rotating the adjusting member (10).

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