Corrosion pit depth measuring device

Abstract

The invention discloses a corrosion pit depth measuring device, and relates to the technical field of pipeline corrosion pit depth detection, according to the corrosion pit depth measuring device, the focal length of two areas of the bottom of a corrosion pit and the surface of a sample near the corrosion pit is measured by applying an objective lens and eyepiece direct connection type portable microscopic observer through the optical principle, and the depth of the corrosion pit is measured. The depth of the corrosion pit is determined according to the focal length difference of the two, and the measurement precision is high through fine adjustment of the focal length and is not limited by the size and the shape of the corrosion pit; and secondly, by establishing a standard focal length recording excel table and defining a table algorithm, data statistical analysis of the corrosion pit is realized, and scientific and effective data is provided for corrosion evaluation of the pipe. By arranging the measuring assembly, surrounding light can be shielded by using the shading cylinder, and the influence of strong light on observation of the objective lens is avoided; and secondly, the light supplementing lamp is arranged in the shading cylinder, and the brightness of the light supplementing lamp is controlled by the control box, so that a good environment can be provided for observation of the objective lens.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline corrosion pit depth detection, and specifically to a corrosion pit depth measurement device. Background Art

[0002] Corrosion is a chemical reaction process of metals in corrosive media. With the continuous deepening of the industrialization process, more and more metal materials are applied in fields such as petroleum, ships, and navigation. Correspondingly, a large number of corrosion failures also occur. According to statistics in previous years, the economic losses caused by corrosion worldwide each year account for 2% - 4% of the gross national product, and 30% of steel is wasted due to corrosion. The petroleum industry is a major consumer of steel and also a place where metal corrosion frequently occurs. The oil fields in China are mostly distributed in areas with corrosive soil, abundant water, and humid climate, and these special circumstances will all increase the corrosion behavior of metals. In order to effectively address the impact of metal corrosion on various industries, experts at home and abroad have conducted a large number of studies on corrosion mechanisms, corrosion environments, and material corrosion resistance mechanisms, achieving remarkable results and proposing many measures to prevent corrosion failures. However, there is still a lack of effective means for accurately measuring the depth of corrosion pits at present.

[0003] The existing methods for measuring the depth of corrosion pits mainly rely on mechanical processing methods. The part with the corrosion pit is removed from the component, and the corrosion pit is cut open from the center using the cutting sample preparation method. The scale in the microscope is used to measure the cross-section of the corrosion pit, or the measurement is carried out based on the wall thickness measurement principle. It is also possible to measure the depth data of the corrosion pit by reconstructing the image and performing three-dimensional graphic processing on the picture. These methods for measuring the depth of corrosion pits have problems such as the need to damage the component or a large human factor. Therefore, there are large errors in the measured corrosion pit depth data, which is not conducive to accurately evaluating the corrosion behavior of materials.

[0004] Therefore, the present invention proposes a corrosion pit depth measurement device to solve the above problems. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a corrosion pit depth measurement device, which solves the problems that the existing mechanical processing, measurement based on the wall thickness measurement principle, and measurement of corrosion pit depth data by reconstructing the image require damaging the component, or the measurement process has a large human factor, easily resulting in large errors in the measured corrosion pit depth data, and is not conducive to accurately evaluating the corrosion behavior of materials.

[0006] To achieve the above object, the present invention is realized through the following technical solutions: An apparatus for measuring the depth of corrosion pits, comprising a base and a column fixedly connected to the top of the base. A support plate is sleeved on the outer wall of the column. A bearing mechanism for loading the pipe fittings to be detected is fixedly connected to the outer wall of the support plate away from the column. An installation frame is fixedly sleeved on the outer wall of the column and above the support plate. A longitudinal chute is formed on the front surface of the installation frame. A first gear groove is formed on the inner wall of the longitudinal chute. A first gear is rotatably connected to the inside of the first gear groove through a rotating shaft. One end of the rotating shaft rotatably penetrates through the installation frame and is fixedly connected to a height adjustment knob for conveniently rotating the first gear. A position adjustment mechanism for adjusting the measurement position is slidably connected to the inside of the longitudinal chute. A pointer for indicating the longitudinal movement distance of the position adjustment mechanism is fixedly connected to the outer wall of the installation frame and on one side of the height adjustment knob. A fastening bolt for locking the position of the position adjustment mechanism is threadedly connected to the outer wall of the installation frame opposite to the pointer. A measurement component for measuring the pipe fittings to be detected is arranged on the outer wall of the position adjustment mechanism.

[0007] Further, the bearing mechanism includes a V-shaped bearing frame and screws fixedly connected to the four corners of the top of the V-shaped bearing frame. A V-shaped pressing plate for pressing the pipe fittings to be detected is slidably sleeved on the outer walls of adjacent two screws. Nuts are threadedly connected to the screws for fixing the V-shaped pressing plate and the V-shaped bearing frame.

[0008] Further, the position adjustment mechanism includes a vertical plate slidably connected to the inside of the longitudinal chute. Scale wire grooves corresponding to the position of the pointer are uniformly formed on the side wall of the vertical plate. A zero scale marking block for indicating the origin position of the scale wire grooves is fixedly connected to the outer wall of the vertical plate. A transverse chute is formed on the front surface of the vertical plate. A second gear groove is formed on the inner wall of the transverse chute. A second gear is rotatably connected to the inside of the second gear groove through a rotating shaft. One end of the rotating shaft rotatably penetrates through the second gear groove and is fixedly connected to a transverse position adjustment knob. A first groove is formed on the outer wall of the vertical plate opposite to the transverse chute. A first rack meshing with the first gear is fixedly connected to the inside of the first groove. A translation component for adjusting the transverse position of the measurement component is slidably arranged in the transverse chute.

[0009] Further, the translation component includes a transverse support arm slidably connected to the inside of the transverse chute, an installation sleeve fixedly connected to the front surface of the transverse support arm, and a second groove formed on the back surface of the transverse support arm. A second rack meshing with the second gear is fixedly connected to the inside of the second groove.

[0010] Further, the measurement component includes a lens barrel and an eyepiece and an objective lens respectively fixedly connected to both ends of the lens barrel. Slide rails are fixedly connected to both sides of the outer wall of the lens barrel. A light adjustment cover assembly for adjusting the observation light of the objective lens is slidably sleeved on the outer walls of the two slide rails.

[0011] Further, the light adjustment cover assembly includes a light-shielding cylinder slidably sleeved on the outer walls of two slide rails. A plurality of supplementary light lamps are uniformly and fixedly arranged on the inner wall of the light-shielding cylinder, and a control box is fixedly connected to the outer wall of the light-shielding cylinder.

[0012] Further, a lithium battery for providing electrical energy support to the supplementary light lamps and a brightness adjuster for adjusting the brightness of the supplementary light lamps are fixedly connected inside the control box. The brightness adjuster and the lithium battery are both electrically connected to the supplementary light lamps through wires.

[0013] Further, the support plate is detachably and fixedly connected to the outer wall of the column through bolts, which is convenient for replacing different sizes.

[0014] Beneficial effects

[0015] The present invention provides a device for measuring the depth of corrosion pits. Compared with the prior art, it has the following beneficial effects:

[0016] 1. A device for measuring the depth of corrosion pits. A loading mechanism for loading the pipe fittings to be detected is fixedly connected to the outer wall of the support plate away from the column. An installation frame is fixedly sleeved on the outer wall of the column and above the support plate. A longitudinal sliding groove is formed on the front surface of the installation frame, and a first gear groove is formed on the inner wall of the longitudinal sliding groove. A first gear is rotatably connected to the first gear groove through a rotating shaft. One end of the rotating shaft rotatably penetrates through the installation frame and is fixedly connected with a height adjustment knob for conveniently rotating the first gear. A position adjustment mechanism for adjusting the measurement position is slidably connected inside the longitudinal sliding groove. An indicator for indicating the longitudinal movement distance of the position adjustment mechanism is fixedly connected to the outer wall of the installation frame and on one side of the height adjustment knob. A fastening bolt for locking the position of the position adjustment mechanism is threadedly connected to the outer wall of the installation frame opposite to the indicator. A measurement component for measuring the pipe fittings to be detected is arranged on the outer wall of the position adjustment mechanism, which solves the problems that the existing mechanical processing or measuring the depth data of corrosion pits by the wall thickness measurement principle and by reconstructing images requires damaging the components, or the measurement process has a large human factor, which easily leads to large errors in the measured depth data of corrosion pits and is not conducive to accurately evaluating the corrosion behavior of materials.

[0017] 2. A device for measuring the depth of corrosion pits. By using the optical principle and applying a portable microscope with directly connected objective lens and eyepiece, the focal lengths of two regions, namely the bottom of the corrosion pit and the surface of the sample near the corrosion pit, are measured, and the depth of the corrosion pit is determined by the difference between the two focal lengths. Through fine adjustment of the focal length, the measurement accuracy is high and it is not limited by the size and shape of the corrosion pit. Secondly, by establishing a standard focal length record excel table and defining the table algorithm, the data statistics and analysis of corrosion pits are realized, providing scientific and effective data for the corrosion evaluation of pipes.

[0018] 3. A device for measuring the depth of corrosion pits. By setting up a measuring component, it can use a light-shielding cylinder to block the surrounding light and avoid the influence of strong light on the observation of the objective lens. Secondly, by setting up a supplementary light in the light-shielding cylinder and controlling the brightness of the supplementary light through a control box, it can provide a good environment for the observation of the objective lens, which is beneficial to improving the measurement accuracy of the depth of corrosion pits.

[0019] 4. A device for measuring the depth of corrosion pits. By setting up a position adjustment mechanism, it can use a height adjustment knob and a lateral position adjustment knob to slightly adjust the positions of the vertical plate and the lateral support arm respectively. The lateral adjustment can conveniently adjust the position of the objective lens relative to the corrosion pit, facilitating the measurement of the depth of the corrosion pit. Secondly, adjusting the longitudinal position of the vertical plate can change the focal length of the objective lens relative to the pipe fitting to be measured, thereby improving the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the disassembled state structure of the present invention;

[0022] Figure 3 It is a schematic diagram of the enlarged structure of part A of the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the bearing mechanism of the present invention;

[0024] Figure 5 It is a schematic diagram of the disassembled state structure of the position adjustment mechanism of the present invention;

[0025] Figure 6 It is a schematic diagram of the enlarged structure of part B of the present invention;

[0026] Figure 7 It is a schematic diagram of the back structure of the lateral support arm of the present invention;

[0027] Figure 8 It is a schematic diagram of the back structure of the vertical plate of the present invention;

[0028] Figure 9 It is a schematic diagram of the disassembled state structure of the measuring component of the present invention.

[0029] In the figure: 1. Base; 2. Column; 3. Support plate; 4. Loading mechanism; 41. V-shaped loading frame; 42. Screw; 43. V-shaped pressing plate; 5. Mounting frame; 6. Longitudinal chute; 7. First gear groove; 8. First gear; 9. Height adjustment knob; 10. Pointer; 11. Fastening bolt; 12. Position adjustment mechanism; 121. Vertical plate; 122. Scale wire groove; 123. Zero scale marking block; 124. Transverse chute; 125. Second gear groove; 126. Second gear; 127. Transverse position adjustment knob; 128. Transverse support arm; 129. Mounting sleeve; 1210. First rack; 1211. Second rack; 13. Measuring assembly; 131. Lens barrel; 132. Eyepiece; 133. Objective lens; 134. Slide rail; 135. Light-shielding barrel; 136. Supplementary light; 137. Control box. Detailed implementation mode

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] As Figures 1-9 , the present invention provides four technical solutions: a corrosion pit depth measurement device, specifically including the following embodiments:

[0032] Embodiment 1: A corrosion pit depth measurement device includes a base 1 and a column 2 fixedly connected to the top of the base 1. A support plate 3 is sleeved on the outer wall of the column 2. A loading mechanism 4 for loading the pipe fittings to be detected is fixedly connected to the outer wall of the support plate 3 away from the column 2. An installation frame 5 is fixedly sleeved on the outer wall of the column 2 and above the support plate 3. A longitudinal chute 6 is opened on the front surface of the installation frame 5. A first gear groove 7 is opened on the inner wall of the longitudinal chute 6. A first gear 8 is rotatably connected to the inside of the first gear groove 7 through a rotating shaft. One end of the rotating shaft rotatably penetrates the installation frame 5 and is fixedly connected to a height adjustment knob 9 for conveniently rotating the first gear 8. A position adjustment mechanism 12 for adjusting the measurement position is slidably connected to the inside of the longitudinal chute 6. A pointer 10 for indicating the longitudinal movement distance of the position adjustment mechanism 12 is fixedly connected to the outer wall of the installation frame 5 and on one side of the height adjustment knob 9. A fastening bolt 11 for locking the position of the position adjustment mechanism 12 is threadedly connected to the outer wall of the installation frame 5 opposite to the pointer 10. A measuring assembly 13 for measuring the pipe fittings to be detected is arranged on the outer wall of the position adjustment mechanism 12. The pointer 10 is used to indicate the changed position of the scale wire groove 122. The support plate 3 is detachably fixedly connected to the outer wall of the column 2 through bolts, which is convenient for replacing different sizes.

[0033] Embodiment 2: The main difference between this embodiment and the first implementation manner is as follows: For a corrosion pit depth measuring device, the bearing mechanism 4 includes a V-shaped bearing frame 41 and screws 42 fixedly connected to the four corners at the top of the V-shaped bearing frame 41. A V-shaped pressing plate 43 for pressing the pipe fitting to be detected is slidably sleeved on the outer walls of two adjacent screws 42. A nut is threadedly connected to the screw 42 for fixing the V-shaped pressing plate 43 and the V-shaped bearing frame 41. The V-shaped bearing frame 41 is fixedly connected to one end of the support plate 3. Anti-slip rubber pads are fixedly connected to the inner wall of the V-shaped bearing frame 41 and the bottom of the V-shaped pressing plate 43 to prevent the pipe fitting to be detected from sliding.

[0034] Embodiment 3: The main difference between this embodiment and the second implementation manner is as follows: For a corrosion pit depth measuring device, the position adjustment mechanism 12 includes a vertical plate 121 slidably connected inside the longitudinal chute 6. Scale wire grooves 122 corresponding to the position of the pointer 10 are evenly formed on the side wall of the vertical plate 121. A zero scale mark block 123 for indicating the origin position of the scale wire grooves 122 is fixedly connected to the outer wall of the vertical plate 121. A transverse chute 124 is formed on the front surface of the vertical plate 121. A second gear groove 125 is formed on the inner wall of the transverse chute 124. A second gear 126 is rotatably connected inside the second gear groove 125 through a rotating shaft. One end of the rotating shaft rotatably penetrates through the second gear groove 125 and is fixedly connected to a transverse position adjustment knob 127. A first groove is formed on the outer wall of the vertical plate 121 opposite to the transverse chute 124. A first rack 1210 meshing with the first gear 8 is fixedly connected inside the first groove. A translation assembly for adjusting the transverse position of the measuring assembly 13 is slidably arranged inside the transverse chute 124. The translation assembly includes a transverse support arm 128 slidably connected inside the transverse chute 124, a mounting sleeve 129 fixedly connected to the front surface of the transverse support arm 128, and a second groove formed on the back surface of the transverse support arm 128. A second rack 1211 meshing with the second gear 126 is fixedly connected inside the second groove.

[0035] Embodiment 4: The main difference between this embodiment and the third embodiment is as follows: A device for measuring the depth of corrosion pits, wherein the measuring assembly 13 includes a lens barrel 131, an eyepiece 132 and an objective lens 133 respectively fixedly connected to both ends of the lens barrel 131. Slide rails 134 are fixedly connected to both sides of the outer wall of the lens barrel 131, and a light adjustment cover assembly for adjusting the observation light of the objective lens 133 is slidably sleeved on the outer walls of the two slide rails 134. The lens barrel 131 is fixedly connected to the inside of the mounting sleeve 129. The light adjustment cover assembly includes a light-shielding cylinder 135 slidably sleeved on the outer walls of the two slide rails 134. A plurality of supplementary light lamps 136 are uniformly and fixedly arranged on the inner wall of the light-shielding cylinder 135, and a control box 137 is fixedly connected to the outer wall of the light-shielding cylinder 135. A lithium battery for providing electrical energy support to the supplementary light lamps 136 and a brightness adjuster for adjusting the brightness of the supplementary light lamps 136 are fixedly connected to the inside of the control box 137. The brightness adjuster and the lithium battery are both electrically connected to the supplementary light lamps 136 through wires.

[0036] During use, first loosen the nut on the outer wall of the screw rod 42, pull up the V-shaped pressing plate 43, and the space between the V-shaped bearing frame 41 and the V-shaped pressing plate 43 increases. Then place the pipe fitting to be measured on the top of the V-shaped bearing frame 41, and keep the area with corrosion pits on the surface of the pipe fitting to be measured located at the middle position of the V-shaped bearing frame 41, and the area with corrosion pits is vertically upward. Next, tighten the nut for fixing the V-shaped bearing frame 41 and the V-shaped pressing plate 43, and the position of the pipe fitting to be detected is fixed. Then, rotate the horizontal position adjustment knob 127, the second gear 126 drives the second rack 1211 to move, and the horizontal support arm 128 moves left or right along the horizontal sliding groove 124, moving the objective lens 133 to a position approximately opposite to the area with corrosion pits. Then observe the eyepiece 132, and then turn the horizontal position adjustment knob 127 to further finely adjust the position of the objective lens 133 to ensure that the objective lens 133 is in a position relative to the central area of the area with corrosion pits. Next, loosen the fastening bolt 11 to release the position limitation of the vertical plate 121. At this time, observe the eyepiece 132 and simultaneously rotate the height adjustment knob 9. The first gear 8 drives the first rack 1210 to move, and the vertical plate 121 slides up or down along the longitudinal sliding groove 6 until the deep pits in the area with corrosion pits can be clearly seen in the eyepiece 132. At this time, tighten the fastening bolt 11 to fix the position of the vertical plate 121. Then, observe the position of the pointer 10 indicating the scale groove 122 and record it. Next, move the horizontal position adjustment knob 127 again to adjust the position of the objective lens 133 to be opposite to the flat area on the surface of the pipe fitting to be measured. At this time, observe the eyepiece 132 and simultaneously rotate the height adjustment knob 9. The first gear 8 drives the first rack 1210 to move, and the vertical plate 121 slides up or down along the longitudinal sliding groove 6 until the surface of the pipe fitting to be measured can be clearly seen. At this time, observe the position of the scale groove indicated by the pointer 10 again and record it. The depth of the deep pits in the area with corrosion pits can be obtained by taking the difference between the two recorded data. After the measurement is completed, remove the pipe fitting to be measured, clean the measuring device, and then install it in the storage box.

[0037] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0038] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for measuring the depth of corrosion pits, comprising a base (1) and a column (2) fixedly connected to the top of the base (1). Characterized in that: A support plate (3) is sleeved on the outer wall of the column (2). A bearing mechanism (4) for loading the pipe fittings to be detected is fixedly connected to the outer wall of the support plate (3) away from the column (2). An installation frame (5) is fixedly sleeved on the outer wall of the column (2) and above the support plate (3). A longitudinal chute (6) is formed on the front of the installation frame (5). A first gear groove (7) is formed on the inner wall of the longitudinal chute (6). A first gear (8) is rotatably connected to the inside of the first gear groove (7) through a rotating shaft. One end of the rotating shaft rotatably penetrates through the installation frame (5) and is fixedly connected to a height adjustment knob (9) for conveniently rotating the first gear (8). A position adjustment mechanism (12) for adjusting the measurement position is slidably connected to the inside of the longitudinal chute (6). A pointer (10) for indicating the longitudinal movement distance of the position adjustment mechanism (12) is fixedly connected to the outer wall of the installation frame (5) and on one side of the height adjustment knob (9). A fastening bolt (11) for locking the position of the position adjustment mechanism (12) is threadedly connected to the outer wall of the installation frame (5) opposite to the pointer (10). A measurement component (13) for measuring the pipe fittings to be detected is arranged on the outer wall of the position adjustment mechanism (12).

2. The device for measuring the depth of corrosion pits according to claim 1, Characterized in that: The bearing mechanism (4) includes a V-shaped bearing frame (41) and screws (42) fixedly connected to the four corners of the top of the V-shaped bearing frame (41). A V-shaped pressing plate (43) for pressing the pipe fittings to be detected is jointly slidably sleeved on the outer walls of two adjacent screws (42). Nuts are threadedly connected to the screws (42) for fixing the V-shaped pressing plate (43) and the V-shaped bearing frame (41).

3. The device for measuring the depth of corrosion pits according to claim 1, Characterized in that: The position adjustment mechanism (12) includes a vertical plate (121) slidably connected to the inside of the longitudinal chute (6). Scale wire grooves (122) corresponding to the position of the pointer (10) are uniformly formed on the side wall of the vertical plate (121). A zero scale marking block (123) for indicating the origin position of the scale wire grooves (122) is fixedly connected to the outer wall of the vertical plate (121). A transverse chute (124) is formed on the front of the vertical plate (121). A second gear groove (125) is formed on the inner wall of the transverse chute (124). A second gear (126) is rotatably connected to the inside of the second gear groove (125) through a rotating shaft. One end of the rotating shaft rotatably penetrates through the second gear groove (125) and is fixedly connected to a transverse position adjustment knob (127). A first groove is formed on the outer wall of the vertical plate (121) opposite to the transverse chute (124). A first rack (1210) meshed with the first gear (8) is fixedly connected to the inside of the first groove. A translation component for adjusting the transverse position of the measurement component (13) is slidably arranged in the transverse chute (124).

4. An apparatus for measuring the depth of corrosion pits according to claim 3, characterized in that: The translation assembly includes a lateral support arm (128) slidably connected inside the lateral chute (124), a mounting sleeve (129) fixedly connected to the front surface of the lateral support arm (128), and a second groove formed on the back surface of the lateral support arm (128). A second rack (1211) engaged with the second gear (126) is fixedly connected inside the second groove.

5. An apparatus for measuring the depth of corrosion pits according to claim 1, characterized in that: The measuring assembly (13) includes a lens barrel (131), an eyepiece (132) and an objective lens (133) respectively fixedly connected to both ends of the lens barrel (131). Slide rails (134) are fixedly connected to both sides of the outer wall of the lens barrel (131). A light adjusting cover assembly for adjusting the observation light of the objective lens (133) is slidably sleeved on the outer walls of the two slide rails (134).

6. An apparatus for measuring the depth of corrosion pits according to claim 5, characterized in that: The light adjusting cover assembly includes a light-shielding cylinder (135) slidably sleeved on the outer walls of the two slide rails (134). A plurality of supplementary light lamps (136) are uniformly and fixedly arranged on the inner wall of the light-shielding cylinder (135), and a control box (137) is fixedly connected to the outer wall of the light-shielding cylinder (135).

7. An apparatus for measuring the depth of corrosion pits according to claim 6, characterized in that: A lithium battery for providing electrical energy support to the supplementary light lamps (136) and a brightness adjuster for adjusting the brightness of the supplementary light lamps (136) are fixedly connected inside the control box (137). The brightness adjuster and the lithium battery are electrically connected to the supplementary light lamps (136) through wires.

8. An apparatus for measuring the depth of corrosion pits according to claim 1, characterized in that: The support plate (3) is detachably and fixedly connected to the outer wall of the column (2) by bolts, for facilitating the replacement of different sizes.

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