A device for detecting defects on inner wall of steel pipe

Abstract

This invention discloses a device for detecting defects in the inner wall of steel pipes, comprising: a mounting platform and a driving assembly and a steel pipe positioning assembly mounted on the mounting platform; the steel pipe positioning assembly includes at least two positioning blocks, each positioning block having an elastic element clamped between it and the mounting platform, and each positioning block having a positioning hole for clamping the steel pipe; a probe is mounted at the end of the driving assembly, one end of the probe being fixed to the driving assembly, and the other end pointing towards the steel pipe and extending into the steel pipe to detect the inner wall of the steel pipe. This device greatly reduces probe wear caused by hard friction between the steel pipe and the probe, solves the problem of extreme wear on the probe caused by the steel pipe, significantly improves the service life of the probe, avoids the phenomenon of the probe getting stuck in the steel pipe, reduces the trouble of manufacturing probes and frequently replacing probes, and greatly improves the efficiency of inspection work.

Description

Technical Field

[0001] The invention relates to the technical field of steel pipe inner wall defect detection, and in particular to a steel pipe inner wall defect detection device. Background Art

[0002] At present, the method mainly used for flaw detection of inner wall defects of seamless steel pipes is to use eddy current flaw detectors, such as automobile engine high-pressure oil pipes and high-pressure heater heat exchange tubes. When performing eddy current flaw detection, the probe runs inside the seamless steel pipe. Since the detection output signal is affected by the filling factor, the outer diameter of the probe coil is as close to the inner diameter of the steel pipe as possible during detection. However, this will cause friction between the eddy current detection probe and the steel pipe, especially when the geometric shape of the steel pipe has a large deviation and the axis is not in a straight line state, and the probe may even get stuck in the steel pipe, resulting in a shortened probe life and frequent production and replacement of the probe, which affects normal detection work. Summary of the invention

[0003] In view of the above problems existing in the prior art, a device for detecting inner wall defects of a steel pipe is provided.

[0004] The specific technical solutions are as follows:

[0005] A steel pipe inner wall defect detection device mainly comprises: a mounting platform and a driving component and a steel pipe positioning component arranged on the mounting platform;

[0006] The steel pipe positioning assembly includes at least two positioning blocks, an elastic member is sandwiched between each positioning block and the mounting platform, and each positioning block is provided with a positioning hole for sandwiching a steel pipe;

[0007] A probe is provided at the end of the driving assembly, one end of the probe is fixed on the driving assembly, and the other end of the probe points to the steel pipe and can be extended into the steel pipe to detect the inner wall of the steel pipe.

[0008] The above-mentioned steel pipe inner wall defect detection device also has the following characteristics: each of the positioning blocks is provided with a plurality of first mounting grooves on the side facing the mounting platform, and the mounting platform is provided with a second mounting groove corresponding to the first mounting groove, and one end of the elastic member is located in the first mounting groove, and the other end is located in the second mounting groove.

[0009] The above-mentioned steel pipe inner wall defect detection device also has the following characteristics: the positioning holes on each positioning block are through holes, the axes of all the positioning holes are collinear and have the same height, and the axis of the probe is collinear with the axes of all the positioning holes.

[0010] The above-mentioned steel pipe inner wall defect detection device also has the feature that the rigidity of the elastic member arranged on the positioning block close to the probe is smaller than the rigidity of the elastic member on the other positioning block.

[0011] The above-mentioned steel pipe inner wall defect detection device also has the following feature: the probe is mounted on a probe guide rod, and one end of the probe guide rod away from the probe is mounted on the driving assembly.

[0012] The above-mentioned steel pipe inner wall defect detection device also has the following characteristics, and also includes a bearing seat and a linear bearing. The bearing seat is fixed on the mounting table, the linear bearing is arranged in the bearing seat, and the probe guide rod is passed through the linear bearing.

[0013] The above-mentioned steel pipe inner wall defect detection device also has such a feature that the driving assembly includes a driving member and a pulling block, the housing of the driving member is fixed on the mounting platform, the output end of the driving member is drivingly connected to the pulling block, and the pulling block is fixedly connected to the probe guide rod;

[0014] At least two mutually parallel guide rails are arranged on the mounting platform, the length direction of the guide rails and the driving direction of the driving member are both parallel to the axial direction of the steel pipe, and the pulling block is slidably connected to the guide rails toward one side of the mounting platform.

[0015] The above-mentioned steel pipe inner wall defect detection device also has the following characteristics, and further includes a sensor, wherein the sensor is fixed on the mounting platform, and the sensor is arranged at the end position of the linear motion of the pulling block close to the steel pipe.

[0016] The above-mentioned steel pipe inner wall defect detection device also has the following characteristics, and further includes an eddy current detector, which is arranged on the mounting platform and electrically connected to the probe.

[0017] The above-mentioned steel pipe inner wall defect detection device also has the feature that the elastic member is a rubber spring.

[0018] The positive effects of the above technical solution are:

[0019] The present invention provides a steel pipe inner wall defect detection device. An elastic member is arranged between a positioning block and a mounting platform. When friction is generated between a detection probe and the steel pipe, especially when a large deviation occurs in the geometric shape of the steel pipe or the axis is in a non-linear state, the probe contacts the inner wall of the steel pipe. Due to the presence of the elastic member, the steel pipe can drive the positioning block to deviate along the direction of the force acting on the contact point of the probe on the inner wall of the steel pipe when the probe contacts the steel pipe, thereby avoiding hard contact between the probe and the fixed steel pipe, and at the same time improving the overlap between the axis of the probe and the axis of the steel pipe to be measured, greatly reducing the wear of the probe caused by hard friction between the steel pipe and the probe, solving the problem of extreme wear of the probe by the steel pipe, greatly improving the service life of the probe, avoiding the occurrence of the phenomenon of the probe being stuck in the steel pipe, reducing the trouble of making the probe and frequently replacing the probe, and greatly improving the inspection work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the top view of the steel pipe inner wall defect detection device provided by the present invention;

[0021] Figure 2 A schematic cross-sectional view of the steel pipe inner wall defect detection device provided by the present invention;

[0022] Figure 3 This is a schematic cross-sectional structural diagram of the drive assembly provided by the present invention.

[0023] In the attached drawings: 1. steel pipe; 2. mounting table; 21. second mounting slot; 3. driving assembly; 31. driving member; 32. pulling block; 33. guide rail; 4. steel pipe positioning assembly; 41. positioning block; 411. positioning hole; 412. first mounting slot; 5. elastic member; 6. probe; 61. probe guide ball; 7. probe guide rod; 71. wire; 81. bearing seat; 82. linear bearing; 83. rod-shaped member; 84. equalizing steel ring; 85. limit nut; 9. sensor; 10. eddy current detector. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] The serial numbers of the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0026] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0027] See also Figures 1 to 3 , Figure 1 A schematic diagram of the top view of the steel pipe inner wall defect detection device provided by the present invention; Figure 2 A schematic cross-sectional view of the steel pipe inner wall defect detection device provided by the present invention; Figure 3 The cross-sectional structure diagram of the driving assembly provided by the present invention. The present invention discloses a steel pipe inner wall defect detection device, which comprises: a mounting platform 2 and a driving assembly 3 and a steel pipe positioning assembly 4 arranged on the mounting platform 2.

[0028] The steel pipe positioning assembly 4 includes at least two positioning blocks 41 , and an elastic member 5 is sandwiched between each positioning block 41 and the mounting platform 2 .

[0029] Optionally, each positioning block 41 is provided with a plurality of first mounting grooves 412 on one side facing the mounting platform 2, and the mounting platform 2 is provided with a second mounting groove 21 corresponding to the first mounting groove 412, and one end of the elastic member 5 is located in the first mounting groove 412, and the other end is located in the second mounting groove 21.

[0030] For example, in this embodiment, two positioning blocks 41 are provided, and each positioning block 41 is provided with four first mounting grooves 412, and the second mounting grooves 21 and the elastic member 5 are also provided with four, and the two positioning blocks 41 are provided with eight first mounting grooves 412 in total. The number of the first mounting grooves 412, the second mounting grooves 21 and the elastic member 5 is only listed in the present invention and is not used to limit the present invention.

[0031] Optionally, the elastic member 5 is a rubber spring. Further, a rod-shaped member 83 is provided in each elastic member 5, the rod-shaped member 83 is passed through the elastic member 5, one end of the rod-shaped member 83 is fixed to the mounting platform 2, and the other end passes through the positioning block 41 and is limited by the limiting nut 85. Optionally, the rod-shaped member 83 can be a stud bolt. Optionally, the limiting nut 85 is installed on the upper end of the stud bolt, and a preset distance is left between the limiting nut 85 and the upper surface of the foot seat of the positioning block 41. Optionally, a distance of one millimeter is left between the limiting nut 85 and the upper surface of the foot seat of the positioning block 41.

[0032] Furthermore, both ends of the elastic member 5 are provided with a pressure-equalizing steel ring 84. In this embodiment, eight rubber springs are provided and respectively sleeved on eight stud bolts evenly distributed on the mounting platform 2. The diameter and height of the rubber springs can be appropriately increased or decreased according to the installation requirements; the eight foot holes provided on the positioning block 41 of the steel pipe 1 are in clearance fit with the stud bolts, the first mounting groove 412 is stably buckled on the top of the rubber spring, the limiting nut 85 is screwed on the upper end of the stud bolt and the upper surface of the foot of the positioning block 41 at a distance of one millimeter, and the total embedding depth of the rubber spring in the first mounting groove 412 and the second mounting groove 21 is one-half to two-thirds of the length of the rubber spring.

[0033] Each positioning block 41 is provided with a positioning hole 411 for clamping the steel pipe 1. To improve the coincidence between the axis of the probe 6 and the axis of the steel pipe 1 to be measured, preferably, the axes of all the positioning holes 411 are collinear and have the same height, and the axis of the probe 6 is collinear with the axes of all the positioning holes 411.

[0034] In the aforementioned embodiment of the two positioning blocks 41 , the two ends of the steel pipe 1 are respectively installed in the two positioning holes 411 . Preferably, the two positioning holes 411 are at the same height, and the axis of the probe 6 is colinear with the axes of the two positioning holes 411 .

[0035] The bottom surfaces of all positioning blocks 41 are on the same horizontal plane and parallel to the upper surface of the mounting platform 2. According to the processing and installation conditions, the height of the stud bolts, the diameter and height of the rubber springs can be appropriately increased or decreased according to the installation requirements to ensure the installation requirements. The axes of the eight rubber springs are perpendicular to the upper surface of the mounting platform. A probe 6 is provided at the end of the driving component 3. One end of the probe 6 is fixed on the driving component 3, and the other end points to the steel pipe 1 and can be inserted into the steel pipe 1 to detect the inner wall of the steel pipe 1.

[0036] Optionally, the positioning holes 411 on each positioning block 41 are through holes, especially the positioning holes 411 close to the probe 6 are set as through holes, one end of which is used to install the steel pipe 1, and the other end is used to install the probe 6. The probe 6 extends into the through hole and can extend into the steel pipe 1 for detection.

[0037] Furthermore, the probe 6 is mounted on a probe guide rod 7, and one end of the probe guide rod 7 away from the probe 6 is mounted on the driving assembly 3. Similarly, the axial direction of the probe guide rod 7 is colinear with the axial directions of the two positioning holes 411.

[0038] Optionally, the probe 6 is further provided with a probe guide ball 61 , and the probe guide ball 61 is used to guide the probe 6 when in contact with the steel pipe 1 .

[0039] When the probe guide ball 61 of the probe 6 contacts the steel pipe 1, the positioning block 41 far away from the probe 6 will not have a large backward movement and jump to affect the coincidence of the axis of the probe guide rod 7 and the axis of the measured steel pipe 1. Preferably, in this embodiment, the rigidity of the elastic member 5 provided on the positioning block 41 close to the probe 6 is less than the rigidity of the elastic member 5 provided on the other positioning block 41, that is, the rigidity of the elastic member 5 far away from one end of the probe 6 should be greater than the rigidity of the elastic member 5 close to one end of the probe 6, and the seamless steel pipe is accurately positioned in the two positioning blocks 41. This makes it possible for the measured steel pipe 1 to be gradually guided during the automatic deviation correction process when the probe 6 contacts the measured steel pipe 1, and the positioning block 41 far away from the probe 6 forms a relatively stable fulcrum, so as not to produce a large deviation, jump and vibration of the measured steel pipe 1 during the automatic deviation correction process to affect the coincidence of the axis of the probe guide rod 7 and the axis of the measured steel pipe 1.

[0040] Furthermore, it also includes a bearing seat 81 and a linear bearing 82, the bearing seat 81 is fixed on the mounting platform 2, the linear bearing 82 is arranged in the bearing seat 81, and the probe guide rod 7 is passed through the linear bearing 82. The linear bearing 82 accurately guides the probe guide rod 7 to ensure the smooth linear motion of the probe guide rod 7.

[0041] Optionally, the driving assembly 3 includes a driving member 31 and a pulling block 32, the housing of the driving member 31 is fixed on the mounting platform 2, the output end of the driving member 31 is drivingly connected to the pulling block 32, and the pulling block 32 is fixedly connected to the probe guide rod 7;

[0042] At least two parallel guide rails 33 are provided on the mounting platform 2 . The length direction of the guide rails 33 and the driving direction of the driving member 31 are parallel to the axial direction of the steel pipe 1 . The pulling block 32 is slidably connected to the guide rails 33 toward one side of the mounting platform 2 .

[0043] Specifically, the axis of the driving member 31 and the length direction of the guide rail 33 are parallel to the axis direction of the steel pipe 1. The driving member 31 and the guide rail 33 are arranged on one side of the steel pipe positioning assembly 4. The guide rail 33 guides the movement of the pull block 32 and then the probe 6.

[0044] The pulling block 32 is a strip-shaped member, which is arranged in a direction perpendicular to the guide rail 33. One end of the pulling block 32 is arranged close to the probe 6, wherein the end close to the probe 6 is directly connected to the probe 6, or is indirectly connected to the probe 6 through the probe guide rod 7. The driving member 31 drives the pulling block 32 to reciprocate along the axis direction of the steel pipe 1, thereby driving the probe 6 to extend into the steel pipe 1 to detect the inner wall of the steel pipe 1. In order to limit the movement of the probe 6, a sensor 9 is also included. The sensor 9 is fixed on the mounting platform 2, and the sensor 9 is arranged at the end position of the pulling block 32 moving close to the steel pipe 1.

[0045] Optionally, the driving member 31 may be a cylinder, and the operating speed and stability of the probe 6 may be adjusted through a cylinder control system to provide a stable detection state with an ideal detection speed for eddy current detection of inner wall defects of the steel pipe 1 .

[0046] Furthermore, an eddy current detector 10 is included, which is arranged on the mounting platform 2 and electrically connected to the probe 6. The probe 6 continuously detects the inner wall of the steel pipe 1 during movement, and transmits the detected data to the eddy current detector 10, which processes and analyzes the data. The probe 6 is electrically connected to the eddy current detector 10 through a wire 71, and the wire 71 is located in the probe guide rod 7.

[0047] The steel pipe inner wall defect detection device provided by the present invention arranges an elastic member 5 between the positioning block 41 and the mounting platform 2, so that when friction is generated between the detection probe 6 and the steel pipe 1, especially when the geometric shape of the steel pipe 1 has a large deviation or the axis is in a non-linear state, the probe 6 contacts the inner wall of the steel pipe 1. Due to the presence of the elastic member 5, the steel pipe 1 can drive the positioning block 41 to deviate along the direction of the contact force of the probe 6 on the inner wall of the steel pipe 1 when the probe 6 contacts the steel pipe 1, thereby avoiding the hard contact between the probe 6 and the fixed steel pipe 1, and at the same time improving the overlap between the axis of the probe 6 and the axis of the steel pipe 1 to be measured, greatly reducing the probe wear caused by the hard friction between the steel pipe 1 and the probe 6, solving the problem of extreme wear of the probe 6 by the steel pipe 1, greatly improving the service life of the probe 6, avoiding the occurrence of the probe 6 getting stuck in the steel pipe 1, reducing the trouble of making the probe 6 and frequently replacing the probe 6, and greatly improving the inspection work efficiency.

[0048] Furthermore, due to the existence of the rubber spring, the clearance fit between the foot hole of the positioning block 41 and the stud bolt, and the spacing between the foot of the positioning block 41 and the limit nut 85, the positioning block 41 can be slightly offset in the direction of any force, up and down, left and right, front and back, when subjected to force, and the friction between the detection probe 6 and the steel pipe 1 is generated when the probe 6 is in contact with the steel pipe 1. Especially when the geometric shape of the steel pipe 1 has a large deviation or the axis is in a non-linear state, the probe guide ball 61 at the head of the probe 6 can first contact the inner wall line of the steel pipe 1, so that the steel pipe The positioning block 41 of 1 is slightly offset along the direction of the force exerted by the probe guide ball 61 on the inner wall of the steel pipe 1, thereby avoiding the hard contact between the probe 6 and the fixed steel pipe 1, and at the same time improving the coincidence degree between the axis of the probe guide rod 7 and the axis of the measured steel pipe 1, solving the technical difficulties of eddy current detection of defects on the inner wall of the steel pipe 1, and avoiding the collision and wear of the steel pipe 1 on the probe 6, and the occurrence of the phenomenon that the probe 6 is stuck in the steel pipe 1 and cannot be detected, thereby greatly improving the service life of the probe 6, reducing the trouble of making the probe 6 and frequently replacing the probe 6, and greatly improving the inspection work efficiency.

[0049] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A steel pipe inner wall defect detection device, characterized in that: include: A mounting platform and a driving assembly and a steel pipe positioning assembly arranged on the mounting platform; The steel pipe positioning assembly includes at least two positioning blocks, an elastic member is sandwiched between each positioning block and the mounting platform, and each positioning block is provided with a positioning hole for sandwiching a steel pipe; A probe is provided at the end of the driving assembly, one end of the probe is fixed on the driving assembly, and the other end of the probe points to the steel pipe and can be extended into the steel pipe to detect the inner wall of the steel pipe.

2. The steel pipe inner wall defect detection device according to claim 1, characterized in that: A plurality of first mounting grooves are arranged on one side of each positioning block facing the mounting platform, and a second mounting groove corresponding to the first mounting groove is arranged on the mounting platform. One end of the elastic member is located in the first mounting groove, and the other end is located in the second mounting groove.

3. The steel pipe inner wall defect detection device according to claim 2, characterized in that: A rod-shaped member is arranged in each of the elastic members, one end of the rod-shaped member is fixed to the mounting platform, and the other end passes through the positioning block and is limited by a limiting nut. A preset distance is left between the limiting nut and the positioning block, and equalizing steel rings are arranged at both ends of the elastic member.

4. The steel pipe inner wall defect detection device according to claim 1, characterized in that: The positioning holes on each positioning block are through holes, the axes of all the positioning holes are collinear and have the same height, and the axis of the probe is collinear with the axes of all the positioning holes.

5. The steel pipe inner wall defect detection device according to claim 1, characterized in that: The rigidity of the elastic member arranged on the positioning block close to the probe is smaller than the rigidity of the elastic member on the other positioning block.

6. The steel pipe inner wall defect detection device according to claim 1, characterized in that: The probe is mounted on a probe guide rod, and one end of the probe guide rod away from the probe is mounted on the driving assembly.

7. The steel pipe inner wall defect detection device according to claim 6, characterized in that: It also includes a bearing seat and a linear bearing. The bearing seat is fixed on the mounting platform, the linear bearing is arranged in the bearing seat, and the probe guide rod is passed through the linear bearing.

8. The steel pipe inner wall defect detection device according to any one of claims 6 to 7, characterized in that: The driving assembly comprises a driving member and a pulling block, the housing of the driving member is fixed on the mounting platform, the output end of the driving member is drivingly connected to the pulling block, and the pulling block is fixedly connected to the probe guide rod; At least two mutually parallel guide rails are arranged on the mounting platform, the length direction of the guide rails and the driving direction of the driving member are both parallel to the axial direction of the steel pipe, and the pulling block is slidably connected to the guide rails toward one side of the mounting platform.

9. The steel pipe inner wall defect detection device according to claim 8, characterized in that: It also includes a sensor, which is fixed on the mounting platform and arranged at the end position of the linear motion of the pulling block towards the steel pipe.

10. The steel pipe inner wall defect detection device according to claim 8, characterized in that: It also includes an eddy current detector, which is arranged on the mounting platform and electrically connected to the probe.

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