Flaw detection device for welding of internally-penetrating steel pipe

Abstract

The flaw detection device comprises a detection cylinder, a connecting rod is fixedly mounted at the end part of the detection cylinder, a positioning seat is welded and fixed at the end part of the connecting rod, and meanwhile, a first mounting seat and a second mounting seat are respectively mounted on the circumferential inner wall of the detection cylinder; studs are movably mounted on the first mounting base and the second mounting base, driving bases are mounted on the outer sides of the studs in a threaded connection mode, limiting wheel transmission assemblies are mounted on the surfaces of the driving bases, adjusting knobs are fixedly mounted at the ends of the studs, and a motor is mounted on the surface of the second mounting base. According to the flaw detection device for welding of the internally-penetrating steel pipe, the telescopic handle extends, so that the flaw detection range of the device is enlarged; flaw detection personnel can freely move the probe and perform flaw detection according to an ideal scanning path; the fatigue of flaw detection personnel caused by long-time operation of operators in a narrow space is avoided, and the flaw detection efficiency and accuracy are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a flaw detection device field, specifically is a kind of for the flaw detection device of inner steel pipe welding. BACKGROUND

[0002] In the welding process, the weld of inner steel pipe can appear various defects;For example, porosity is formed due to the gas in the weld pool not escaping in time during welding;Porosity can reduce the strength and density of weld;Therefore, ultrasonic flaw detection device needs to be used to carry out flaw detection work on the weld;Ultrasonic flaw detection device can effectively detect the porosity inside the weld by using the reflection characteristics of ultrasonic waves in different media;

[0003] The upper surface of the weld position on the inner steel pipe is exposed outside, which facilitates detection by the detection probe of the flaw detection device;However, the inner wall of the weld position on the inner steel pipe needs to be inserted into the inner steel pipe by the detection probe held by the worker for flaw detection, and the space inside the inner steel pipe is relatively small, so the space for operating the flaw detection probe by the flaw detection personnel is limited;This makes it difficult for the flaw detection personnel to move the probe freely, and it is impossible to carry out flaw detection according to the ideal scanning path;Long-time operation in a small space can easily cause the flaw detection personnel to be tired, affecting the efficiency and accuracy of flaw detection. SUMMARY

[0004] The utility model aims at providing a flaw detection device for inner steel pipe welding to solve the defects mentioned in the background.

[0005] To achieve the above-mentioned purpose, a flaw detection device for inner steel pipe welding is provided, which comprises a detection cylinder, a connecting rod is fixedly installed at the end of the detection cylinder, a positioning seat is welded and fixed at the end of the connecting rod, a first mounting seat and a second mounting seat are respectively installed on the circumferential inner wall of the detection cylinder, a threaded stud is movably installed on the first mounting seat and the second mounting seat, a driving seat is screw-connected and installed on the outer side of the threaded stud, a limiting wheel transmission assembly is installed on the surface of the driving seat, an adjusting knob is fixedly installed at the end of the threaded stud, an electric motor is installed on the surface of the second mounting seat, the output shaft of the electric motor is fixedly connected with a rocker arm, a flaw detection probe is screw-connected and installed at the end of the rocker arm, and the rocker arm comprises an adjusting arm and a connecting arm;Four groups of slot holes are uniformly formed on the circumferential outer wall of the detection cylinder, and a driven arm is inserted into each of the four groups of slot holes.

[0006] Preferably, the axial section of the positioning seat and the detection cylinder is a concentric circle structure, and the positioning seat and the detection cylinder are fixedly connected by four groups of connecting rods.

[0007] Preferably, a positioning hole with a size matching that of the end of the telescopic handle is formed in the inside of the positioning seat, and the end of the telescopic handle is inserted into the inside of the positioning seat and fixedly connected by bolts.

[0008] Preferably, the drive seat is made of metal with a square cross-section, and limit wheel transmission assemblies are installed on all four sides of the drive seat, with the four sets of limit wheel transmission assemblies operating synchronously.

[0009] Preferably, a wire harness receiving tube is fixedly installed on the inner circumference of the detection cylinder, and the length of the wire harness receiving tube is greater than the length of the detection cylinder.

[0010] Preferably, four sets of guide rods are evenly installed between the first mounting base and the second mounting base, and the four sets of guide rods are respectively inserted into four sets of guide holes evenly opened on the drive base.

[0011] Preferably, the surface of the drive seat is movably connected to the active arm via a U-shaped seat, and the top of the active arm is movably connected to the driven arm via a pin. At the same time, the bottom of the driven arm is movably connected to the connecting seat via a pin. The end of the connecting seat is fixedly set on the inner circumference of the detection cylinder. A wheel is movably installed on the top of the driven arm, and the driven arm and the active arm are arranged in a "V" shape.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. This utility model uses four sets of wheels that are rolled on the inner wall of the inserted steel pipe. While the flaw detection probe moves laterally, it also rotates under the drive of the motor, so that the flaw detection probe contacts the inner wall of the inserted steel pipe and makes a spiral motion, so that the probe covers all positions of the inner circumference of the steel pipe, including the weld area, avoiding the detection blind zone caused by the fixed or linear movement of the probe, and greatly improving the probability of defect detection.

[0014] 2. This utility model increases the flaw detection range of the device by extending the telescopic handle; flaw detection personnel can move the probe freely and perform flaw detection according to the ideal scanning path; it avoids the fatigue of flaw detection personnel caused by long-term operation in a confined space, and improves the efficiency and accuracy of flaw detection. Attached Figure Description

[0015] Figure 1 This is a front view schematic diagram of the structure of this utility model;

[0016] Figure 2 for Figure 1 A bottom view;

[0017] Figure 3 for Figure 1 Top view;

[0018] Figure 4 for Figure 1 Rear view;

[0019] Figure 5 is Figure 1 side view.

[0020] The figure mark: 1, telescopic handle; 2, positioning seat; 3, connecting rod; 4, detection cylinder; 41, slot hole; 5, first mounting seat; 6, adjusting knob; 7, stud; 8, driving seat; 9, limit wheel transmission assembly; 91, walking wheel; 92, driven arm; 93, connecting seat; 94, driving arm; 10, second mounting seat; 11, motor; 12, rocker arm; 13, flaw detection probe; 14, wire harness containing tube. DETAILED DESCRIPTION

[0021] Please see Figures 1-5 The utility model provides a kind of flaw detection device for inner steel pipe welding, including detection cylinder 4, detection cylinder 4 end fixedly installed with connecting rod 3, and connecting rod 3 end is welded with positioning seat 2, while the circumferential inner wall of detection cylinder 4 is respectively installed with first mounting seat 5 and second mounting seat 10, and first mounting seat 5 and second mounting seat 10 are movably installed with stud 7, stud 7 is externally screwed with driving seat 8, and the surface of driving seat 8 is installed with limit wheel transmission assembly 9, while stud 7 end fixedly installed with adjusting knob 6, the surface of second mounting seat 10 is installed with motor 11, and the output shaft of motor 11 is fixedly connected with rocker arm 12, while the end of rocker arm 12 is screwed with flaw detection probe 13, and rocker arm 12 includes adjusting arm and connecting arm;Four groups of slot holes 41 are evenly provided on the circumferential outer wall of detection cylinder 4, and four groups of slot holes 41 are all inserted with driven arm 92.

[0022] Working principle: when using, telescopic handle 1 end is inserted and fixed in the inside of positioning seat 2, while according to the inner diameter of the inner steel pipe to be detected, adjusting knob 6 is rotated, the interval between two groups of oppositely arranged walking wheels 91 is adjusted, different diameter inner steel pipes are adapted, so that the device can detect the inner wall weld of inner steel pipe with different diameters.

[0023] After the working size of the limiting wheel transmission assembly 9 is adjusted, the device is put into the inner steel pipe, and the four groups of walking wheels 91 roll on the inner wall of the inner steel pipe. At this time, the handheld telescopic handle 1 is used to move the detection cylinder 4 axially in the inner steel pipe. At the same time, the flaw detection probe 13 rotates under the drive of the motor 11 while moving transversely, so that the flaw detection probe 13 contacts the inner wall of the inner steel pipe and moves spirally, so that the probe covers each position of the inner wall of the steel pipe, including the weld area, avoiding the detection blind area caused by the fixed or linear motion of the probe, greatly improving the probability of defect detection. The handheld telescopic handle 1 enables the device to move transversely in the inner steel pipe. By extending the telescopic handle 1, the flaw detection range of the device is increased. The flaw detection personnel can move the probe freely and perform flaw detection according to the ideal scanning path. It avoids the fatigue of the flaw detection personnel caused by long-time operation in a small space, and improves the efficiency and accuracy of flaw detection.

[0024] The rocker arm 12 includes an adjusting arm and a connecting arm. The adjusting arm is inserted into the inside of the connecting arm and is fixed by a bolt after adjustment. By adapting the length of the rocker arm 12 to different heights of the walking wheel 91, the flaw detection probe 13 also contacts the inner wall of the steel pipe when the walking wheel 91 contacts the inner wall of the steel pipe. The height adjustment method of the walking wheel 91 is: rotating the adjusting knob 6 to make the driving seat 8 screwed on the outside of the stud 7 move transversely, thereby changing the angle between the driven arm 92 and the driving arm 94, achieving the purpose of height adjustment of the walking wheel 91.

[0025] As a preferred embodiment, the axial section of the positioning seat 2 and the detection cylinder 4 is a concentric circle structure, and the positioning seat 2 and the detection cylinder 4 are fixedly connected by four groups of connecting rods 3.

[0026] The inside of the positioning seat 2 is provided with a positioning hole matching the size of the end of the telescopic handle 1, and the end of the telescopic handle 1 is inserted into the inside of the positioning seat 2 and fixedly connected by a bolt.

[0027] As a preferred embodiment, the driving seat 8 is made of metal material with a square structure, and four limiting wheel transmission assemblies 9 are installed on the four faces of the driving seat 8, and the four groups of limiting wheel transmission assemblies 9 operate synchronously.

[0028] A wire harness containing pipe 14 is fixedly installed on the circumferential inner wall of the detection cylinder 4, and the length of the wire harness containing pipe 14 is greater than the length of the detection cylinder 4.

[0029] As a preferred embodiment, four groups of guide rods are evenly installed between the first mounting seat 5 and the second mounting seat 10, and the four groups of guide rods are respectively inserted into the four groups of guide holes evenly provided on the driving seat 8.

[0030] The surface of the driving seat 8 is movably connected with the driving arm 94 through a U-shaped seat, the top of the driving arm 94 is movably connected with the driven arm 92 through a pin shaft, the bottom of the driven arm 92 is movably connected with the connecting seat 93 through a pin shaft, the end of the connecting seat 93 is fixedly arranged on the circumferential inner wall of the detection cylinder 4, the top of the driven arm 92 movably installs the walking wheel 91, and the driven arm 92 and the driving arm 94 are arranged in a "V" shape.

Claims

1. A device for the detection of defects in the welding of internally threaded steel pipes, comprising a detection cylinder (4), characterized in that: The connecting rod (3) is fixedly installed at the end of the detection cylinder (4), and the connecting rod (3) is fixedly welded with the positioning seat (2) at the end, meanwhile, the first mounting seat (5) and the second mounting seat (10) are respectively installed on the circumferential inner wall of the detection cylinder (4), and the threaded stud (7) is movably installed on the first mounting seat (5) and the second mounting seat (10), the drive seat (8) is screwed on the outer side of the threaded stud (7), the limiting wheel transmission assembly (9) is installed on the surface of the drive seat (8), the adjusting knob (6) is fixedly installed at the end of the threaded stud (7), the motor (11) is installed on the surface of the second mounting seat (10), the output shaft of the motor (11) is fixedly connected with the rocker arm (12), the flaw detection probe (13) is screwed at the end of the rocker arm (12), the rocker arm (12) includes an adjusting arm and a connecting arm; four groups of slot holes (41) are uniformly arranged on the circumferential outer wall of the detection cylinder (4), and the driven arm (92) is inserted into the four groups of slot holes (41).

2. A device for detecting flaws in the welding of internally worn steel pipes according to claim 1, characterized in that: The axial section of the positioning seat (2) and the detection cylinder (4) is a concentric circle structure, and the positioning seat (2) and the detection cylinder (4) are fixedly connected by the four groups of connecting rods (3).

3. A device for detecting flaws in the welding of internally worn steel pipes according to claim 2, characterized in that: The positioning hole which is matched with the size of the end of the telescopic handle (1) is arranged in the positioning seat (2), and the telescopic handle (1) is inserted into the positioning seat (2) and fixedly connected by bolts.

4. A device for detecting flaws in the welding of internally worn steel pipes according to claim 1, characterized in that: The drive seat (8) is made of metal material and has a square structure, and the four faces of the drive seat (8) are provided with the limiting wheel transmission assembly (9), and the four groups of limiting wheel transmission assemblies (9) operate synchronously.

5. A device for detecting flaws in the welding of internally worn steel pipes according to claim 1, characterized in that: The wire harness containing pipe (14) is fixedly installed on the circumferential inner wall of the detection cylinder (4), and the length of the wire harness containing pipe (14) is greater than the length of the detection cylinder (4).

6. A device for detecting flaws in the welding of internally worn steel pipes according to claim 1, characterized in that: Four groups of guide rods are evenly arranged between the first mounting seat (5) and the second mounting seat (10), and the four groups of guide rods are respectively inserted into the four groups of guide holes evenly arranged on the drive seat (8).

7. A device for detecting flaws in the welding of internally threaded steel pipes according to claim 4, characterized in that: The surface of the drive seat (8) is movably connected with the driving arm (94) through the U-shaped seat, the top of the driving arm (94) is movably connected with the driven arm (92) through the pin shaft, the bottom of the driven arm (92) is movably connected with the connecting seat (93) through the pin shaft, the connecting seat (93) is fixedly arranged on the circumferential inner wall of the detection cylinder (4), the walking wheel (91) is movably installed on the top of the driven arm (92), and the driven arm (92) and the driving arm (94) are arranged in a "V" shape.

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