Steel structure quality inspection device and inspection method

Abstract

The present invention relates to the technical field of physical inspection of steel structures, and specifically discloses a steel structure quality inspection device and an inspection method, the steel structure quality inspection device comprises an enclosure, a bracket, a nozzle, a camera, a pressure liquid component and a host computer, the enclosure has upper and lower openings and the inner wall is provided with scales, the host computer can determine whether there are cracks according to the image of the area to be inspected, in response to the determination result of the existence of the crack, control the nozzle to spray filling liquid and control the pressure plate to press down the filling liquid, control the pressure plate to stop according to the reaction force of the filling liquid on the pressure plate, and determine the crack volume according to the corresponding scale when the pressure plate stops pressing down; the number of cracks in the area to be inspected can be accurately determined by spraying and image acquisition of the area to be inspected, and when cracks exist, the filling liquid and the downward pressure of the pressure plate can be used to make the filling liquid fully penetrate into the crack to determine the volume of the crack, thereby effectively improving the versatility of the steel structure quality inspection device while ensuring the inspection accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of physical detection of steel structures, and in particular to a steel structure quality detection device and a detection method. Background Art

[0002] At present, steel structures are widely used in construction projects. For the installation and construction of steel structures, welding methods are mostly used, such as arc welding, gas shielded welding, laser welding, etc. If there are pores and cracks in the weld during the welding process, it will have a great impact on the strength of the steel structure and the safety of the project.

[0003] For the surface defects of cracks in welds, the existing detection methods are relatively mature, such as visual inspection, radioactive detection, coating detection, laser detection, and digital non-destructive detection by computer vision and image acquisition. A steel structure welding quality detection method is disclosed in the prior art, including the following steps: S1, spraying the sampling area covering the welding position with white coloring paint, and only removing the excess paint; S2, collecting the original image I covering the entire sampling area, and then grayscale processing to obtain the original grayscale image Ig; S3, threshold segmentation to obtain the grayscale image P of the welding area; S4, threshold segmentation to obtain the defect area R1, and then classify; S5, threshold segmentation to obtain the defect area R2, and then classify; S6, calculate the welding defect evaluation index E of the current sampling area; S7, rate the welding quality of the current sampling area, and complete the welding quality detection. The technical solution sprays the welding area with white coloring paint in advance, so that the cracks are colored by white paint, and the cracks can be easily identified through grayscale images.

[0004] However, the above solution has the following problems: if the cracks are deep, the paint cannot effectively cover them, which may easily lead to inaccurate detection results. Summary of the invention

[0005] The purpose of the present invention is to provide a steel structure quality inspection device and inspection method, which can accurately detect cracks in various size ranges and determine the volume of the cracks to support process analysis of the steel structure.

[0006] To this end, in a first aspect, the present invention provides a steel structure quality inspection device, the steel structure quality inspection device comprising an enclosure, a bracket, a nozzle, a camera, a hydraulic pressure component and a host computer, the enclosure is a hollow structure with upper and lower openings, the lower end of the enclosure is used to be sealed and connected to the area to be tested, and the inner wall of the enclosure is provided with a scale;

[0007] The bracket is fixedly connected above the enclosure member and is used to fix the device above the area to be tested;

[0008] The spray head is detachably connected to the bracket and is used to spray paint to the area to be tested and to spray filling liquid into the enclosure;

[0009] The camera is fixedly connected to the bracket and is used to collect an image of the area to be measured and a scale image of the inner wall of the enclosure;

[0010] The hydraulic pressure assembly is detachably connected to the bracket, and comprises a pressing plate, a telescopic rod and a motor connected in sequence from bottom to top, wherein the pressing plate is adapted in shape to the hollow portion of the enclosure and can move in the enclosure in the up and down directions;

[0011] The host computer determines whether there is a crack in response to the image of the area to be tested, controls the nozzle to spray filling liquid and controls the pressure plate to press down the filling liquid in response to the determination result of the existence of the crack, and controls the pressure plate to stop according to the reaction force of the filling liquid on the pressure plate. The host computer is also used to determine the crack volume according to the corresponding scale when the pressure plate stops pressing down.

[0012] As a preferred technical solution of the steel structure quality inspection device, the host computer determines the number of cracks based on the image of the area to be inspected after spraying and the image after the surface paint of the area to be inspected is wiped off.

[0013] As a preferred technical solution of the steel structure quality inspection device, the host computer is provided with a control mode of the hydraulic pressure component, and the control mode includes:

[0014] obtaining a reaction force of the filling fluid on the pressing plate in response to a preset position condition;

[0015] In response to the state that the reaction force is less than the preset force value, continue to press the pressing plate until the reaction force of the filling liquid on the pressing plate is equal to the preset force value;

[0016] Wherein, the preset position condition satisfies that the pressing plate is at a preset scale.

[0017] As a preferred technical solution for the steel structure quality inspection device, the host computer can determine the crack volume by comparing the scale at which the pressure plate is located when the reaction force is equal to the preset force value with the preset scale.

[0018] As a preferred technical solution for the steel structure quality inspection device, the installation positions of the nozzle and the pressure liquid assembly are located at the same position where the bracket is directly opposite to the centroid of the enclosure.

[0019] As a preferred technical solution for the steel structure quality inspection device, the pressure plate is provided with air holes and is sealed and slidably connected to the inner wall of the enclosure along the circumferential direction and the up and down directions. The air holes are opened before the pressure plate contacts the filling liquid surface to enable the pressure plate to move on the inner wall of the enclosure, and the air holes are closed when the pressure plate contacts the filling liquid surface.

[0020] As a preferred technical solution for the steel structure quality inspection device, the host computer controls the spraying pressure, spraying direction and spraying amount of the paint or filling liquid sprayed out by the spray head in a single time to be the same.

[0021] As a preferred technical solution for the steel structure quality inspection device, a glue filling groove is circumferentially provided at the lower end of the enclosure, and a sealing connection between the lower end of the enclosure and the area to be inspected is achieved by filling the corresponding colloid in the glue filling groove.

[0022] On the other hand, the present invention provides a steel structure quality inspection method, which is applied to the above-mentioned steel structure quality inspection device, comprising: arranging the steel structure quality inspection device in the area to be inspected;

[0023] Control the nozzle to spray paint to the area to be tested;

[0024] Obtain the image of the area to be tested captured by the camera;

[0025] Determining the number of cracks according to the image of the area to be tested;

[0026] If the number of cracks is greater than 0, controlling the nozzle to spray the filling liquid;

[0027] The nozzle is removed, the hydraulic pressure assembly is installed, the pressing plate is pressed down to a preset pressure, and the crack volume is determined according to the scale at which the pressing plate is at the preset pressure.

[0028] As a preferred technical solution of the steel structure quality inspection method, determining the number of cracks according to the image of the area to be inspected includes:

[0029] Acquire a first image to be tested after the area to be tested is sprayed, and determine a portion of the first image to be tested that is different in color from the paint as a crack area;

[0030] Erasing the exposed paint, collecting a second image to be tested after erasing, and determining a portion of the second image to be tested that still shows the paint color as a crack area;

[0031] Merge two or more crack zones that have a containment relationship and determine them as the same crack zone;

[0032] The number of cracked areas is determined as the number of cracks.

[0033] The beneficial effects of the present invention are:

[0034] The steel structure quality inspection device and inspection method provided by the present invention include an enclosure, a bracket, a nozzle, a camera, a pressure liquid component and a host computer. The enclosure is opened at the top and bottom and the inner wall is provided with a scale. The host computer can determine whether there is a crack according to the image of the area to be tested, and in response to the determination result of the existence of the crack, the nozzle is controlled to spray the filling liquid and the pressure plate is controlled to press the filling liquid downward, and the pressure plate is controlled to stop according to the reaction force of the filling liquid on the pressure plate. The host computer is also used to determine the crack volume according to the corresponding scale when the pressure plate stops pressing down. The steel structure quality inspection device of the present invention can accurately determine the number of cracks in the area to be tested by spraying and image acquisition of the area to be tested, and when there is a crack, the filling liquid and the downward pressure of the pressure plate make the filling liquid fully penetrate into the crack, and the volume of the filling liquid flowing into the crack can be determined by comparing the scales, that is, the volume of the crack. The determination of the crack volume can provide sufficient data support for further quality analysis of the steel structure, and effectively improve the versatility of the steel structure quality inspection device while ensuring the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a first structural schematic diagram of a steel structure quality inspection device in an embodiment of the present invention;

[0036] Figure 2 is a second structural schematic diagram of the steel structure quality inspection device in an embodiment of the present invention;

[0037] Figure 3 is a schematic diagram of a liquid pressure component in an embodiment of the present invention;

[0038] Figure 4 is a flow chart of a steel structure quality inspection method in an embodiment of the present invention;

[0039] Figure 5 A flow chart of determining the number of cracks according to an image of a region to be tested in an embodiment of the present invention;

[0040] In the figure:

[0041] 1. Enclosures;

[0042] 2. Bracket; 21. Fixing rod; 22. Mounting seat; 23. Sprinkler / pressure assembly mounting hole; 24. Camera mounting hole;

[0043] 3. Fill the glue groove;

[0044] 4. Inner wall of enclosure;

[0045] 5. Motor;

[0046] 6. Clamp;

[0047] 7. Telescopic rod;

[0048] 8. Press plate;

[0049] 9. Stomata. DETAILED DESCRIPTION

[0050] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are 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 limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature "above", "above" and "above" the second feature include the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature include the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0054] See also Figure 1-3As shown, the steel structure quality inspection device provided by the present invention includes an enclosure 1, a bracket 2, a nozzle, a camera, a hydraulic pressure component and a host computer. The enclosure 1 is a hollow structure with upper and lower openings. The lower end of the enclosure 1 is used to be sealed and connected to the area to be tested, and the inner wall 4 of the enclosure is provided with a scale;

[0055] The bracket 2 is fixedly connected to the upper part of the enclosure 1, and is used to fix the device above the area to be tested;

[0056] The spray head is detachably connected to the bracket 2 and is used to spray paint to the area to be tested and to spray filling liquid into the enclosure 1;

[0057] The camera is fixedly connected to the bracket 2 and is used to collect images of the area to be measured and scale images of the inner wall 4 of the enclosure;

[0058] The hydraulic pressure assembly is detachably connected to the bracket 2, and includes a pressing plate 8, a telescopic rod 7 and a motor 5 which are sequentially connected from bottom to top. The pressing plate 8 is adapted to the shape of the hollow part of the enclosure 1 and can move in the enclosure 1 in the up and down directions.

[0059] The host computer determines whether there is a crack in response to the image of the area to be tested, and controls the nozzle to spray the filling liquid and controls the pressure plate 8 to press the filling liquid in response to the determination result of the existence of the crack. The pressure plate 8 is controlled to stop according to the reaction force of the filling liquid on the pressure plate 8. The host computer is also used to determine the crack volume according to the corresponding scale when the pressure plate 8 stops pressing down.

[0060] In the above embodiment, the steel structure quality inspection device can accurately determine the number of cracks in the area to be tested by spraying and capturing images of the area to be tested, and when cracks exist, the filling liquid and the downward pressure of the pressure plate 8 can allow the filling liquid to fully penetrate into the cracks. By comparing the scales, it can be determined that the volume of the filling liquid flowing into the crack is the volume of the crack. The determination of the crack volume can provide sufficient data support for further quality analysis of the steel structure, effectively improving the versatility of the steel structure quality inspection device while ensuring the detection accuracy.

[0061] Of course, it can be understood that in the above embodiment, the paint should be able to be clearly distinguished from the color of the steel structure, and the filling liquid should be oily, a liquid with little penetration effect on the steel structure, and the setting of the pressure plate 8 should ensure that the filling liquid does not overflow upward during the liquid pressing process. Optionally, the filling liquid is silicone oil or mineral oil.

[0062] Specifically, the upper computer is electrically connected to the camera, the hydraulic assembly and the nozzle, and the upper computer can be integrated on the upper surface of the mounting seat 22, or can be independently provided from the bracket 2 and the enclosure 1. The hydraulic assembly is provided with a clamp 6, which can be clamped into the nozzle / hydraulic assembly mounting hole 23 on the bracket, and the camera is installed in the camera mounting hole 24. The mounting seat 22 is integrally provided with the enclosure 1 through the fixing rod 21, and the mounting seat 22 is provided with a recessed portion that directly passes through the nozzle / hydraulic assembly mounting hole 23 to facilitate the installation of the nozzle or the hydraulic assembly.

[0063] In practice, the lower end of the blocking member can be configured as a curved surface or other shapes to fit a non-planar structure such as a tubular steel structure, and the corresponding structure of the pressure plate is also configured as a curved surface matching the steel structure.

[0064] Specifically, the host computer is provided with a control mode of the hydraulic component, and the control mode includes:

[0065] Acquiring a reaction force of the filling fluid on the pressing plate 8 in response to a preset position condition;

[0066] In response to the state that the reaction force is less than the preset force value, the pressing plate 8 is continuously pressed down until the reaction force of the filling liquid on the pressing plate 8 is equal to the preset force value. If the reaction force is greater than or equal to the preset force value, it is determined that the test failure is caused by excessive filling liquid or the presence of impurities and the test is stopped. It can be understood that the working premise of the pressure liquid component is the existence of cracks. If the crack exists, the reaction force received when reaching the preset scale should be less than the preset force value. If it is greater than or equal to the preset force value, it means that the test failure needs to be repeated.

[0067] Among them, the preset position condition satisfies that the pressing plate 8 is at a preset scale. In detail, the preset scale is the scale of the pressing plate 8 corresponding to the state where there is no crack. The preset force value can be determined through a limited number of experiments based on actual working conditions such as the area of ​​the area to be tested and the mechanical properties of the filling liquid. It is sufficient that there is no cavity in the area below the pressing plate 8 when the preset force value is reached. It will not be repeated here. Furthermore, the reaction force of the filling liquid on the pressing plate 8 can be determined by arranging a pressure sensor or feedback from a motor under the pressing plate 8.

[0068] Specifically, the host computer can compare the scale where the pressure plate 8 is located when the reaction force is equal to the preset force value with the preset scale to determine the crack volume. Both scales can determine a volume value, and the difference between the volume values ​​of the two scales is the crack volume, which can intuitively and conveniently determine the crack volume.

[0069] In order to ensure the effect of the nozzle and the liquid pressure component, the installation position of the nozzle and the liquid pressure component is located at the same position of the bracket 2 facing the centroid of the enclosure 1. In detail, the installation of the nozzle at the above position can effectively ensure the coverage of the coating in the area to be tested and effectively avoid the splashing of the filling liquid. The same position installation of the liquid pressure component and the nozzle makes the two synchronized, and the liquid pressure process is more effective and reliable. On the other hand, it can effectively avoid the phenomenon of uneven force application of the telescopic rod 7 and the pressure plate 8.

[0070] In order to make the pressing plate 8 work effectively, the pressing plate 8 is provided with air holes 9 and the pressing plate 8 is sealed and slidably connected with the inner wall 4 of the enclosure along the circumferential direction and along the up-down direction. The air holes 9 are opened before the pressing plate 8 contacts the liquid surface of the filling liquid so that the pressing plate 8 can move on the inner wall 4 of the enclosure. The air holes 9 are closed when the pressing plate 8 contacts the liquid surface of the filling liquid. In order to ensure the detection accuracy of the crack volume, the pressing plate 8 and the inner wall 4 of the enclosure should be set without leakage. If the pressing plate 8 is not provided with air holes 9, air pressure will be generated, which will cause the liquid pressing process to be unable to proceed or the measurement result to be inaccurate.

[0071] Specifically, the upper computer controls the spraying pressure, spraying direction and spraying amount of the paint or filling liquid sprayed out by the nozzle in a single time to be the same. The above settings make the test results of the steel structure quality inspection device for different test areas have good comparability.

[0072] Specifically, a glue filling groove 3 is provided at the lower end of the enclosure 1 along the circumferential direction, and a sealing connection between the lower end of the enclosure 1 and the area to be tested is achieved by filling the corresponding colloid in the glue filling groove 3. In implementation, the colloid is first filled in the glue filling groove 3, and then the glue filling groove 3 is buckled on the area to be tested. The colloid realizes a sealing connection between the enclosure 1 and the area to be tested through the action of gravity and the compression of the enclosure 1, that is, the filling liquid does not leak from all around the enclosure 1. Optionally, the colloid is a silicone sealant or a polyurethane sealant.

[0073] See also Figure 4 As shown, this embodiment also provides a steel structure quality detection method, including:

[0074] Step S1, deploying a steel structure quality inspection device in the area to be inspected;

[0075] Step S2, controlling the nozzle to spray paint to the area to be tested;

[0076] Step S3, obtaining an image of the area to be tested captured by the camera;

[0077] Step S4, determining the number of cracks according to the image of the area to be tested;

[0078] Step S5, if the number of cracks is greater than 0, control the nozzle to spray the filling liquid, and if there are no cracks, end the detection;

[0079] Step S6, remove the nozzle, install the hydraulic pressure assembly, press the pressing plate down to a preset pressure, and determine the crack volume according to the scale at which the pressing plate is at the preset pressure.

[0080] See also Figure 5 As shown, in the process of determining the number of cracks according to the image of the area to be tested, the host computer determines the number of cracks according to the image of the area to be tested after spraying and the image after the surface paint of the area to be tested is erased, specifically including:

[0081] Step S41, obtaining a first image to be tested after the area to be tested is sprayed, and determining a portion of the first image to be tested that is different in color from the paint as a crack area;

[0082] Step S42, erasing the exposed paint, collecting the second image to be tested after erasing, and determining the portion of the second image to be tested that still shows the paint color as the crack area;

[0083] Step S43, merging two or more crack regions that have a containment relationship to determine them as the same crack region;

[0084] Step S44, determining the number of crack areas as the number of cracks.

[0085] In the above embodiment, by analyzing the images of the two areas to be tested after spraying and after erasing, it is possible to cover the situation where the crack is too deep and not completely sprayed, the situation where paint remains in the crack after the crack is erased, and the situation where both are presented by the same crack, and the number of cracks can be accurately determined, which facilitates further quality analysis of the steel structure.

[0086] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A steel structure quality inspection device, characterized in that: include: The enclosure member (1) is a hollow structure with upper and lower openings, the lower end of the enclosure member (1) is used for sealing connection with the area to be tested, and the inner wall (4) of the enclosure member is provided with scales; A bracket (2) is fixedly connected to the upper part of the enclosure (1) and is used to fix the device above the area to be tested; A spray head, detachably connected to the bracket (2), used for spraying paint onto the area to be tested and spraying filling liquid into the enclosure (1); A camera, fixedly connected to the bracket (2), and used to collect an image of the area to be measured and a scale image of the inner wall (4) of the enclosure; a hydraulic pressure assembly, detachably connected to the bracket (2), comprising a pressure plate (8), a telescopic rod (7) and a motor (5) connected in sequence from bottom to top, wherein the pressure plate (8) is adapted in shape to the hollow portion of the enclosure (1) and is movable in the upper and lower directions within the enclosure (1); A host computer, wherein the host computer determines whether there is a crack in response to the image of the area to be tested, controls the nozzle to spray the filling liquid and controls the pressing plate (8) to press the filling liquid downward in response to the determination result of the existence of the crack, controls the pressing plate (8) to stop according to the reaction force of the filling liquid on the pressing plate (8), and the host computer is also used to determine the crack volume according to the corresponding scale when the pressing plate (8) stops pressing downward.

2. The steel structure quality inspection device according to claim 1, characterized in that: The host computer determines the number of cracks according to the image of the area to be tested after spraying and the image after the surface paint of the area to be tested is wiped off.

3. The steel structure quality inspection device according to claim 2, characterized in that: The host computer is provided with a control mode of the hydraulic pressure component, and the control mode includes: Acquiring a reaction force of the filling fluid on the pressing plate (8) in response to a preset position condition; In response to the state that the reaction force is less than a preset force value, the pressing plate (8) continues to be pressed down until the reaction force of the filling liquid on the pressing plate (8) is equal to the preset force value; The preset position condition satisfies that the pressing plate (8) is at a preset scale.

4. The steel structure quality inspection device according to claim 3, characterized in that: The host computer can compare the scale at which the pressure plate (8) is located when the reaction force is equal to the preset force value with the preset scale to determine the crack volume.

5. The steel structure quality inspection device according to claim 4, characterized in that: The installation positions of the spray head and the liquid pressure assembly are located at the same position of the bracket (2) facing the centroid of the enclosure (1).

6. The steel structure quality inspection device according to claim 5, characterized in that: The pressing plate (8) is provided with an air hole (9) and the pressing plate (8) is sealed and slidably connected to the inner wall (4) of the enclosure along the circumferential direction and along the up and down directions. Before the pressing plate (8) contacts the liquid surface of the filling liquid, the air hole (9) is opened to enable the pressing plate (8) to move on the inner wall (4) of the enclosure. When the pressing plate (8) contacts the liquid surface of the filling liquid, the air hole (9) is closed.

7. The steel structure quality inspection device according to claim 6, characterized in that: The host computer controls the spraying pressure, spraying direction and spraying amount of the paint or filling liquid sprayed by the spray head in a single time to be the same.

8. The steel structure quality inspection device according to claim 7, characterized in that: The lower end of the enclosure (1) is provided with a glue filling groove (3) along the circumferential direction, and a corresponding colloid is filled in the glue filling groove (3) to achieve a sealed connection between the lower end of the enclosure (1) and the area to be tested.

9. A detection method applied to the steel structure quality detection device according to any one of claims 1 to 8, the detection method comprising: Arrange the steel structure quality inspection device in the area to be inspected; Control the nozzle to spray paint to the area to be tested; Obtain the image of the area to be tested captured by the camera; Determining the number of cracks according to the image of the area to be tested; If the number of cracks is greater than zero, controlling the nozzle to spray the filling liquid; The nozzle is removed, the hydraulic pressure assembly is installed, the pressing plate is pressed down to a preset pressure, and the crack volume is determined according to the scale at which the pressing plate is at the preset pressure.

10. The detection method according to claim 9, characterized in that: Determining the number of cracks according to the image of the area to be tested includes: Acquire a first image to be tested after the area to be tested is sprayed, and determine a portion of the first image to be tested that is different in color from the paint as a crack area; Erasing the exposed paint, collecting a second image to be tested after erasing, and determining a portion of the second image to be tested that still shows the paint color as a crack area; Merge two or more crack zones that have a containment relationship and determine them as the same crack zone; The number of cracked areas is determined as the number of cracks.

Images