A non-destructive testing device for wall hollowing

Abstract

The utility model discloses a kind of wall hollowing nondestructive testing device, it is related to wall detection technical field, including: base;Universal wheel, setting at the bottom end four corners of base;Lifting assembly, setting at the top end one side of base;Infrared thermal imager, setting at the top one side wall of lifting assembly;Auxiliary assembly, symmetrically setting on the top two end side walls of lifting assembly;Detection assembly, a plurality of setting on the one side wall of auxiliary assembly;Counterweight, a plurality of setting on the top end other side of base;Control panel, setting on the one end side wall of lifting assembly.The utility model structure is reasonable and reliable, easy to operate, can be realized to detection assembly Multi-angle detection adjustment, avoid because of not enough uniformity in the range of knocking cover, appear the phenomenon of detection omission, to improve the detection efficiency and accuracy of the wall hollowing nondestructive testing device, more widely adaptable.

Description

Technical Field

[0001] This utility model relates to the field of wall inspection technology, specifically to a non-destructive testing device for wall hollowing. Background Technology

[0002] Hollow spots in walls occur when air gaps exist between the masonry and plaster layers, leading to poor contact. This typically manifests as higher elevations in localized areas and may be accompanied by cracks. In interior decoration, wall inspection of interior side walls is particularly crucial, as it directly affects the adhesion quality of subsequent decorative layers and safety. A common method for detecting hollow spots is to gently tap the wall with a hollow hammer or other hard object, identifying the hollow spot by the difference in sound. The hollow spot usually produces a "thump-thump" sound, different from the normal sound of other areas. Visually, the hollow spot is generally slightly higher than the surrounding area, and a hollow feeling can be felt when pressed. The presence of hollow spots in walls has serious consequences for subsequent decoration. For example, after applying putty, latex paint may crack or even peel off; and when tiling, hollow spots may cause tiles to crack or fall off, posing risks to construction and use. Therefore, non-destructive testing for hollow spots in walls is particularly important. It can accurately identify and locate the problem without damaging the structure, providing a basis for subsequent treatment and ensuring construction quality and long-term stability of the wall.

[0003] However, existing non-destructive testing devices for wall hollowness mostly rely on manual tapping to detect hollowness in interior side walls. Furthermore, manual tapping covers an uneven area, easily leading to missed areas. It's also inconvenient to adjust the tapping hammer at multiple angles, reducing testing efficiency. Additionally, fine cracks in the wall surface are difficult to detect with the naked eye, further contributing to oversights and reducing the overall efficiency of non-destructive testing for wall hollowness.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0005] In view of the problems in related technologies, this utility model proposes a non-destructive testing device for wall hollowing to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] Therefore, the specific technical solution adopted by this utility model is as follows: A non-destructive testing device for hollow walls includes: a base; casters disposed at the four corners of the bottom end of the base; a lifting assembly disposed on one side of the top end of the base; an infrared thermal imager disposed on one side wall of the top end of the lifting assembly; auxiliary components symmetrically disposed on the side walls of the top ends of the lifting assembly; several detection components disposed on one side wall of the auxiliary components; several counterweights disposed on the other side of the top end of the base; and a control panel disposed on one side wall of the lifting assembly.

[0007] Furthermore, in order to enable flexible adjustment of the infrared thermal imager and detection components at different heights and positions under the action of the lifting assembly, accurately scan and detect the wall surface, and avoid detection blind spots or missed detections caused by fixed height or position, thereby improving the detection efficiency of the wall hollow non-destructive testing device, the lifting assembly includes an L-shaped support plate set at the top of the base. A frame is set on one side of the L-shaped support plate, and a moving groove is opened in the middle of one side of the frame. A moving block is set inside the moving groove, and a threaded rod is passed through the top of the moving block. The top of the threaded rod is connected to a first servo motor that passes through the top of the frame. A horizontal plate is set on one side of the moving block, and connecting columns that cooperate with auxiliary components are symmetrically set on the two side walls of the horizontal plate. Limiting sliders are symmetrically set at both ends of the other side of the horizontal plate, and limiting grooves that cooperate with the limiting sliders are symmetrically opened at both ends of one side of the frame.

[0008] Furthermore, in order to enable multi-angle detection and adjustment of the detection component with the help of the auxiliary components, and to avoid the phenomenon of detection omissions due to uneven coverage of the tapping range, thereby improving the tapping detection efficiency of the wall hollow non-destructive testing device, the auxiliary components include a fixing member set at the end of the connecting column, a driving member set on one side of the fixing member, a track plate set at the end of the connecting column, a slide rail set on one side of the track plate, a fixing plate set on one side of the track plate away from the slide rail, and a slide rail groove opened on the other side wall of the track plate. The slide rail groove has two symmetrical limiting grooves inside. The driving member includes an electric telescopic rod set on one side wall of the fixing plate. The telescopic end of the electric telescopic rod is connected to a T-shaped slider that cooperates with the slide rail. The slide rail groove has two symmetrical sliding blocks inside. A rotating plate is set on one side wall of each sliding block. A connecting rod is fitted inside each limiting groove. One side of each connecting rod is connected to the T-shaped slider through a push rod.

[0009] Furthermore, to enable inspectors to identify hollow spots in the wall by tapping sounds, thus avoiding missed or misjudgments due to uneven tapping force or inaccurate tapping location, the detection component improves the accuracy and reliability of wall hollow spot detection. The component includes a stabilizing member on one side of the rotating plate, a movable member on one side of the stabilizing member, and a mounting plate on one side wall of the rotating plate. Symmetrical support plates are arranged in the middle of one side wall of the mounting plate, and an ear is provided at the end of one side wall of the mounting plate away from the support plates. The other side wall has a placement hole. The movable part includes a second servo motor set at the top of one of the support plates. The output end of the second servo motor passes through the support plate and is connected to a rotating shaft. The bottom end of the rotating shaft passes through the top of the other support plate. A lifting rod is movably connected to the middle of one side of the ear seat through a pin. A cam that cooperates with the lifting rod is sleeved on the outer circumference of the middle part of the rotating shaft. A pull plate is set on the side wall of one end of the lifting rod. A spring is sleeved on one side of the pull plate. The end of the spring is fixedly connected to the inside of the placement hole. A striking rod is connected to one side of the end of the lifting rod. A striking ball is connected to the end of the striking rod.

[0010] The beneficial effects of this utility model are as follows: 1. This utility model has a reasonable and reliable structure and is simple to operate. Through the coordinated action of the base, casters, lifting components, infrared thermal imager, auxiliary components, detection components, counterweight, and control panel, it can not only flexibly adjust the infrared thermal imager and detection components at different heights and positions, accurately scan and detect the wall surface, and avoid detection blind spots or missed detections caused by fixed heights or positions, thus improving the detection efficiency of the non-destructive testing device for wall hollowness, but also enable multi-angle detection adjustment of the detection components to avoid detection omissions due to uneven tapping coverage. At the same time, it can also allow inspectors to identify wall hollowness by tapping sounds, avoiding missed detections or misjudgments caused by uneven tapping force or inaccurate tapping positions, thereby improving the detection efficiency and accuracy of the non-destructive testing device for wall hollowness and making it more adaptable.

[0011] 2. By setting up a lifting component, the infrared thermal imager and detection components can be flexibly adjusted at different heights and positions, accurately scanning and detecting the wall surface, avoiding blind spots or missed detections caused by fixed heights or positions, thereby improving the detection efficiency of the non-destructive testing device for wall hollowing.

[0012] 3. By setting auxiliary components, the detection components can be adjusted to detect from multiple angles, avoiding the phenomenon of missed detection due to uneven coverage of the tapping area, thereby improving the tapping detection efficiency of the wall hollow non-destructive detection device.

[0013] 4. By setting up detection components, inspectors can identify hollow spots in the wall by tapping sounds, avoiding missed detections or misjudgments caused by uneven tapping force or inaccurate tapping position, thereby improving the accuracy and reliability of wall hollow spot detection. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a perspective view of a non-destructive testing device for wall hollowing according to an embodiment of the present utility model; Figure 2 yes Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is another perspective view of a non-destructive testing device for wall hollowing according to an embodiment of the present utility model; Figure 4 yes Figure 3 A magnified view of a section at point B in the middle; Figure 5 This is a cross-sectional view of the lifting component in a non-destructive testing device for wall hollowing according to an embodiment of the present utility model; Figure 6 This is another sectional view of the lifting component in a non-destructive testing device for wall hollowing according to an embodiment of the present utility model; Figure 7 This is a cross-sectional view of an auxiliary component in a non-destructive testing device for wall hollowing according to an embodiment of the present utility model; Figure 8 This is a cross-sectional view from another angle of an auxiliary component in a non-destructive testing device for wall hollowing according to an embodiment of the present utility model.

[0016] In the picture: 1. Base; 2. Casters; 3. Lifting assembly; 301. L-shaped support plate; 302. Frame; 303. Moving slot; 304. Moving block; 305. Threaded rod; 306. First servo motor; 307. Horizontal plate; 308. Connecting column; 309. Limiting slider; 3010. Limiting slide groove; 4. Infrared thermal imager; 5. Auxiliary components; 501. Fixing component; 5011. Track plate; 5012. Slide rail; 5013. Fixing plate; 5014. Slide rail groove; 5015. Limiting groove; 502. Drive component; 5021. Electric telescopic... 5022, T-shaped slider; 5023, sliding block; 5024, rotating plate; 5025, connecting rod; 5026, push rod; 6, detection assembly; 601, stabilizing component; 6011, mounting plate; 6012, support plate; 6013, ear seat; 6014, placement hole; 602, moving part; 6021, second servo motor; 6022, rotating shaft; 6023, lifting rod; 6024, cam; 6025, pull plate; 6026, spring; 6027, striking rod; 6028, striking ball; 7, counterweight; 8, control panel. Detailed Implementation

[0017] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0018] According to an embodiment of this utility model, a non-destructive testing device for wall hollowing is provided.

[0019] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figures 1-8 As shown, the wall hollowing non-destructive testing device according to an embodiment of the present utility model includes: a base 1; casters 2, disposed at the four corners of the bottom end of the base 1; a lifting assembly 3, disposed on one side of the top end of the base 1; an infrared thermal imager 4, disposed on one side wall of the top end of the lifting assembly 3; auxiliary components 5, symmetrically disposed on the side walls of the top ends of the lifting assembly 3; several detection components 6, disposed on one side wall of the auxiliary components 5; several counterweights 7, disposed on the other side of the top end of the base 1; and a control panel 8, disposed on one side wall of the lifting assembly 3.

[0020] Furthermore, the structures and working principles of the caster wheel 2, counterweight 7, first servo motor 306, infrared thermal imager 4, electric telescopic rod 5021, second servo motor 6021, and striking ball 6028 are all existing technologies, and will not be elaborated on here.

[0021] In practical applications, the control panel 8 is equipped with a human-machine interface and a PLC programmable logic controller. The human-machine interface is the interaction interface between the operator and the automation system. Its main functions are to display the real-time operating status and input control commands. The PLC is used to execute specific control tasks, such as switching, controlling the start and stop of the electric telescopic rod 5021 and its extension length and speed, the start and stop of the first servo motor 306 and the second servo motor 6021 and their speed, or the start and stop of the infrared thermal imager 4, or sensor signal acquisition and processing, etc.

[0022] It should be explained that when the infrared thermal imager 4 is activated via control panel 8, the device begins scanning the wall and capturing its surface temperature distribution. Since minute cracks in the wall often cause changes in thermal conductivity, the temperature in the crack area may differ from the surrounding area. The infrared thermal imager 4 generates a thermal image by detecting these temperature differences. Control panel 8 receives and processes the image data from the infrared thermal imager in real time, identifying and locating the minute cracks in the wall. The detection results are fed back to the inspector via control panel 8, displaying the specific location of the cracks and temperature differences graphically or in text.

[0023] In one embodiment, the lifting assembly 3 includes an L-shaped support plate 301 disposed at the top of the base 1. A frame 302 is disposed on one side of the L-shaped support plate 301. A moving groove 303 is opened in the middle of one side of the frame 302. A moving block 304 is disposed inside the moving groove 303. In a specific application, a threaded hole is opened at the top of the moving block 304 to cooperate with the threaded rod 305 (not shown in the figure, representing prior art). The threaded rod 305 is passed through the top of the moving block 304. The top of the threaded rod 305 is connected to a first servo motor 306 that passes through the top of the frame 302. A horizontal plate 307 is provided on one side of the 04. Connecting columns 308 that cooperate with auxiliary components 5 are symmetrically provided on the two side walls of the horizontal plate 307. Limiting sliders 309 are symmetrically provided on both ends of the other side of the horizontal plate 307. Limiting grooves 3010 that cooperate with limiting sliders 309 are symmetrically provided on both ends of one side of the frame 302. This allows the infrared thermal imager 4 and the detection component 6 to be flexibly adjusted at different heights and positions under the action of the lifting component 3, accurately scanning and detecting the wall surface, avoiding blind spots or missed detections caused by fixed height or position, thereby improving the detection efficiency of the wall hollow non-destructive testing device.

[0024] The specific working principle of the lifting component 3 is as follows: When it is necessary to adjust the infrared thermal imager 4 and the detection component 6 to different heights and positions, the first servo motor 306 is started to drive the threaded rod 305 to rotate forward and backward. Under the action of the threaded rod 305 and the threaded hole, the moving block 304 is driven to move up and down reciprocally. The up and down reciprocating motion of the moving block 304 drives the horizontal plate 307 to move up and down reciprocally under the action of the limiting slider 309 and the limiting groove 3010, thereby driving the infrared thermal imager 4 and the detection component 6 to adjust to different heights and positions, thus improving the detection efficiency of the wall hollow non-destructive testing device.

[0025] In one embodiment, the auxiliary component 5 includes a fixing member 501 at the end of the connecting column 308, a driving member 502 on one side of the fixing member 501, a track plate 5011 at the end of the connecting column 308, a slide rail 5012 on one side of the track plate 5011, a fixing plate 5013 at one end of the track plate 5011 away from the slide rail 5012, a slide rail groove 5014 on the other side wall of the track plate 5011, and two symmetrical limiting grooves 5015 inside the slide rail groove 5014. The driving member 502 includes an electric telescopic rod 5021 on one side wall of the fixing plate 5013. The telescopic end of the electric telescopic rod 5021 is connected to a T-shaped slider 5022 that cooperates with the slide rail 5012. The slide rail groove 5014 is provided with two symmetrical sliding blocks 5023. A rotating plate 5024 is provided on one side wall of each sliding block 5023. A connecting rod 5025 is provided inside each limiting groove 5015. One side of each connecting rod 5025 is connected to the T-shaped slider 5022 through a push rod 5026. Under the action of the auxiliary component 5, the detection component 6 can be adjusted for multi-angle detection, avoiding the phenomenon of detection omission due to uneven coverage of the tapping range, thereby improving the tapping detection efficiency of the wall hollow non-destructive detection device.

[0026] The specific working principle of auxiliary component 5 is as follows: When it is necessary to drive the detection component 6 to perform multi-angle tapping detection and adjustment, the electric telescopic rod 5021 is activated to extend and retract. The extension and retraction of the electric telescopic rod 5021 drives the T-shaped slider 5022 to move within the slide rail 5012. The movement of the T-shaped slider 5022 drives the connecting rod 5025 to move within the limiting groove 5015 via the push rod 5026. The movement of the connecting rod 5025 drives the sliding block 5023 to move within the slide rail groove 5014. Under the action of the movement of the sliding block 5023, the rotating plate 5024 is driven to move in an arc reciprocating motion. Thus, the rotating plate 5024 drives several detection components 6 to perform multi-angle tapping detection and adjustment, avoiding the phenomenon of detection omissions due to uneven tapping coverage, thereby improving the tapping detection efficiency of the wall hollow non-destructive testing device.

[0027] In one embodiment, the detection component 6 includes a stabilizing member 601 disposed on one side of the rotating plate 5024, a movable member 602 disposed on one side of the stabilizing member 601, the stabilizing member 601 including a mounting plate 6011 disposed on one side wall of the rotating plate 5024, support plates 6012 symmetrically disposed in the middle of one side wall of the mounting plate 6011, an ear seat 6013 disposed at one end of one side wall of the mounting plate 6011 away from the support plate 6012, and a placement hole 6014 opened on the other side wall of the mounting plate 6011. The movable member 602 includes a second servo motor 6021 disposed at the top of one of the support plates 6012, the output end of the second servo motor 6021 passing through the support plate 6012 and connected to a rotating shaft 6022, and the bottom end of the rotating shaft 6022 passing through the other support plate 6012. At the top of 012, a lifting rod 6023 is movably connected to the middle of one side of the ear seat 6013 via a pin. A cam 6024 that cooperates with the lifting rod 6023 is sleeved on the outer circumference of the middle part of the rotating shaft 6022. A pull plate 6025 is provided on the side wall of one end of the lifting rod 6023. A spring 6026 is sleeved on one side of the pull plate 6025. The end of the spring 6026 is fixedly connected to the inside of the placement hole 6014. A striking rod 6027 is connected to one side of the end of the lifting rod 6023. A striking ball 6028 is connected to the end of the striking rod 6027. Under the action of the detection component 6, the inspector can identify the hollow wall by the sound of the tapping. This avoids the occurrence of missed detection or misjudgment due to uneven tapping force or inaccurate tapping position, thereby improving the accuracy and reliability of the hollow wall detection.

[0028] The specific working principle of the detection component 6 is as follows: When it is necessary to tap the wall, the second servo motor 6021 is started to rotate via the control panel 8. The rotation of the second servo motor 6021 drives the rotating shaft 6022 to rotate. When the rotating shaft 6022 rotates, it drives the cam 6024 to rotate. When the protruding end of the cam 6024 rotates to contact one side wall of the lifting rod 6023, it will apply a pushing force to the lifting rod 6023, causing one end of the lifting rod 6023 to drive the striking rod 6027 and the striking ball 6028 to move to one side. When the protruding end of the cam 6024 rotates away from the side wall of the lifting rod 6023, the lifting rod 6023 is pulled back to the other side by the pull plate 6025 under the action of the spring 6026. This causes the striking rod 6027 to drive the striking ball 6028 to tap the wall. By repeating the above operation, the tapping detection of the wall can be completed.

[0029] To facilitate understanding of the above-mentioned technical solutions of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below.

[0030] In practical applications, the base 1 is moved to the indoor side wall to be inspected via the casters 2, so that one side of the base 1 is in contact with the wall. Then, the lifting assembly 3 is activated via the control panel 8 to adjust the height of the infrared thermal imager 4, auxiliary assembly 5, and detection assembly 6. After the height is adjusted, the infrared thermal imager 4 is activated via the control panel 8 to detect minor cracks in the wall and the detection results are fed back to the inspector via the control panel 8. At the same time, the detection assembly 6 is activated to tap the wall to detect hollow areas. The inspector identifies hollow areas in the wall by tapping the sound. With the help of the auxiliary assembly 5, the detection assembly 6 is activated to perform multi-angle detection and adjustment on the wall to avoid omissions due to uneven tapping coverage, thereby improving the accuracy and reliability of non-destructive testing of hollow areas in indoor side walls.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A non-destructive testing device for wall hollowing, characterized in that, include: Base (1); The casters (2) are located at the four corners of the bottom of the base (1); The lifting assembly (3) is located on one side of the top of the base (1); An infrared thermal imager (4) is installed on the top side wall of the lifting assembly (3); Auxiliary components (5) are symmetrically arranged on the top two end side walls of the lifting component (3); Several detection components (6) are disposed on one side wall of the auxiliary component (5); Several counterweights (7) are disposed on the other side of the top of the base (1); The control panel (8) is located on one side wall of the lifting assembly (3); The lifting assembly (3) includes an L-shaped support plate (301) disposed at the top of the base (1). A frame (302) is disposed on one side of the L-shaped support plate (301). A moving groove (303) is opened in the middle of one side of the frame (302). A moving block (304) is disposed inside the moving groove (303). A threaded rod (305) is disposed through the top of the moving block (304). A first servo motor (306) that passes through the top of the threaded rod (305) is connected to the top of the frame (302). A horizontal plate (307) is provided on one side of the moving block (304), and connecting columns (308) that cooperate with the auxiliary component (5) are symmetrically provided on the side walls of both ends of the horizontal plate (307). Limiting sliders (309) are symmetrically arranged at both ends of the other side of the horizontal plate (307), and limiting grooves (3010) that cooperate with the limiting sliders (309) are symmetrically opened at both ends of one side of the frame (302). The auxiliary component (5) includes a fixing member (501) at the end of the connecting column (308), and a driving member (502) is provided on one side of the fixing member (501). The fastener (501) includes a track plate (5011) disposed at the end of the connecting column (308). A slide rail (5012) is disposed on one side of the track plate (5011). A fixing plate (5013) is disposed on one side of the track plate (5011) away from the slide rail (5012). A slide rail groove (5014) is provided on the other side wall of the track plate (5011). Two symmetrical limiting grooves (5015) are provided inside the slide rail groove (5014). The driving component (502) includes an electric telescopic rod (5021) disposed on one side wall of the fixed plate (5013). The telescopic end of the electric telescopic rod (5021) is connected to a T-shaped slider (5022) that cooperates with the slide rail (5012). The slide rail groove (5014) is provided with two symmetrical sliding blocks (5023). Each side wall of the sliding block (5023) is provided with a rotating plate (5024). Each of the limiting grooves (5015) is equipped with a connecting rod (5025), and one side of each connecting rod (5025) is connected to the T-shaped slider (5022) via a push rod (5026).

2. The non-destructive testing device for wall hollowing according to claim 1, characterized in that, The detection component (6) includes a stabilizing member (601) disposed on one side of the rotating plate (5024), and a movable member (602) is disposed on one side of the stabilizing member (601).

3. The non-destructive testing device for wall hollowing according to claim 2, characterized in that, The stabilizing member (601) includes a mounting plate (6011) disposed on one side wall of the rotating plate (5024). A support plate (6012) is symmetrically disposed in the middle of one side wall of the mounting plate (6011). An ear seat (6013) is disposed on one side wall of the mounting plate (6011) away from the support plate (6012). A placement hole (6014) is opened on the other side wall of the mounting plate (6011).

4. The non-destructive testing device for wall hollowing according to claim 3, characterized in that, The movable component (602) includes a second servo motor (6021) disposed at the top of one of the support plates (6012). The output end of the second servo motor (6021) passes through the support plate (6012) and is connected to a rotating shaft (6022). The bottom end of the rotating shaft (6022) passes through the top of the other support plate (6012). A lifting rod (6023) is movably connected to one side of the ear seat (6013) via a pin, and a cam (6024) that cooperates with the lifting rod (6023) is sleeved on the outer wall of the middle circumference of the rotating shaft (6022). A pull plate (6025) is provided on one side wall of the lifting rod (6023), and a spring (6026) is sleeved on one side of the pull plate (6025). The end of the spring (6026) is fixedly connected to the inside of the placement hole (6014). A striking rod (6027) is connected to one side of the end of the lifting rod (6023), and a striking ball (6028) is connected to the end of the striking rod (6027).

Images