Plate surface cleaning device of polishing machine

Abstract

The utility model relates to the technical field of polishing machines, in particular to a plate surface cleaning device of a polishing machine, an upper rack and a lower rack are respectively provided with a water absorption mechanism, the two water absorption mechanisms are oppositely arranged up and down, each water absorption mechanism comprises a steel roller and a sponge sleeve, the steel rollers are rotatably arranged in the polishing machine racks, and the sponge sleeves are arranged on the steel rollers. The sponge sleeve is arranged on the outer side of the steel roller in a sleeving mode, the two ends of the steel roller are connected with steel roller shafts, and the steel roller shafts are connected with height adjusting assemblies. Blowing mechanisms are arranged on the upper rack and the lower rack at intervals, each blowing mechanism comprises a blowing assembly and an air supply assembly, each blowing assembly comprises an air knife and a ventilation pipe, the air knives are fixedly arranged in the polishing machine rack and are obliquely arranged, one end of each ventilation pipe is communicated with the corresponding air knife, and the other end of each ventilation pipe is connected with the corresponding air supply assembly. According to the device, residual moisture on the surface of the aluminum plate can be effectively removed, and the residual moisture on the surface of the aluminum plate can be blow-dried; and meanwhile, residual aluminum skimmings on the surface of the aluminum plate can be conveniently cleaned.

Description

Technical Field

[0001] This utility model relates to the field of polishing machine technology, and specifically to a polishing machine plate cleaning device. Background Technology

[0002] Polishing refers to the process of reducing the surface roughness of a workpiece using mechanical, chemical, or electrochemical methods to obtain a bright and smooth surface. Currently, polishing machines are commonly used in the processing of aluminum sheets. The polishing machine can improve the gloss of the aluminum sheet surface, making the surface smoother, significantly improving its gloss, and enhancing its appearance. At the same time, polishing can remove imperfections such as dents, burrs, and wood streaks from the aluminum sheet surface, making the surface smoother.

[0003] After polishing aluminum sheets using existing polishing machines, moisture and aluminum shavings remain on the surface. The moisture dries and leaves watermarks, making the aluminum surface prone to oxidation and blistering after coating. The aluminum shavings remaining on the surface can easily scratch the aluminum sheet in subsequent processes. Therefore, it is necessary to clean the residual moisture and aluminum shavings from the surface of the aluminum sheet promptly after polishing. However, there is a problem with the polishing machine's ability to conveniently clean these residues after polishing. Summary of the Invention

[0004] This invention addresses the problem of residual moisture and aluminum shavings on the surface of aluminum sheets after polishing with existing polishing machines, by providing a surface cleaning device for polishing machines. This device can effectively remove residual moisture from the surface of aluminum sheets and dry it; it also facilitates the cleaning of residual aluminum shavings on the surface of aluminum sheets.

[0005] To achieve the above objectives, the technical solution of this utility model is: a polishing machine surface cleaning device, including a polishing machine frame, which comprises an upper frame and a lower frame. Both the upper and lower frames are equipped with water-absorbing mechanisms, which are arranged vertically opposite each other. Each water-absorbing mechanism includes a steel roller and a sponge sleeve. The steel roller is rotatably mounted inside the polishing machine frame, and the sponge sleeve is fitted over the outside of the steel roller. Steel roller shafts are connected to both ends of the steel roller, and height adjustment components are connected to the steel roller shafts. The water-absorbing mechanisms can absorb residual moisture from the surface of the aluminum sheet, the sponge sleeve acts as a water absorbent, and the height of the steel rollers can be adjusted using the height adjustment components, thereby adjusting the distance between the steel rollers of the two water-absorbing mechanisms to accommodate aluminum sheets of different thicknesses.

[0006] Both the upper and lower frames are equipped with purging mechanisms at intervals. Each purging mechanism includes a purging assembly and an air supply assembly. The purging assembly includes an air knife and a ventilation pipe. The air knife is fixedly installed inside the polishing machine frame and is angled. One end of the ventilation pipe is connected to the air knife, and the other end is connected to the air supply assembly. The purging mechanisms on the upper and lower frames respectively blow away moisture and aluminum shavings from the upper and lower surfaces of the aluminum sheet. The air supply assembly provides air to the purging assembly, which is then transported to the air knife via the ventilation pipe. The air is accelerated inside the air knife and then ejected from the slit, forming a uniform, high-speed airflow that blows away moisture and aluminum shavings from the surface of the aluminum sheet, thereby achieving the effect of drying the surface moisture and cleaning the aluminum shavings.

[0007] Furthermore, adjustment slots are provided at the bottom of the upper frame and the top of the lower frame corresponding to the positions of the steel roller shaft. One end of the steel roller shaft passes through the adjustment slot and connects to the height adjustment component. The height adjustment component allows the steel roller shaft to move up and down within the adjustment slot, thereby adjusting the height of the steel roller and, consequently, the distance between the steel rollers of the two suction mechanisms.

[0008] Furthermore, the height adjustment assembly includes a bearing housing, a bearing, an L-shaped seat, and a mounting block. The steel roller shaft is rotatably connected to the bearing housing via the bearing. L-shaped seats are provided on both sides of the bearing housing, and the bearing housing is slidably mounted on the L-shaped seats. The bearing facilitates the rotation of the aluminum sheet as it passes over the steel roller, and the cooperation between the bearing housing and the L-shaped seats allows the steel roller shaft to move within the adjustment groove, thus achieving the effect of adjusting the height of the steel roller.

[0009] Furthermore, the mounting block is fixedly mounted on the outside of the polishing machine frame, and an adjusting screw is slidably mounted on the mounting block. One end of the adjusting screw is connected to the bearing seat, and locking nuts that are threadedly connected to the adjusting screw are provided at the top and bottom of the mounting block. The movement of the adjusting screw can drive the bearing seat to move, thereby adjusting the height of the steel roller through the cooperation of the steel roller shaft and the bearing.

[0010] Furthermore, the air knife of the blowing mechanism on the upper frame is inclined downwards, and the air knife of the blowing mechanism on the lower frame is inclined upwards; the air knife is a hollow shell structure with an opening at the bottom. The cross-section of the air knife is square at the top and triangular at the bottom, and the width of the lower part of the air knife gradually decreases. The purpose of this is to accelerate the air inside the air knife, forming a uniform and high-speed airflow that is ejected from the bottom of the air knife to quickly blow away the moisture and aluminum chips on the surface of the aluminum sheet, thereby achieving the effect of drying the moisture on the surface of the aluminum sheet and cleaning the aluminum chips on the surface of the aluminum sheet.

[0011] Furthermore, the air supply assembly includes a vortex blower, a tee, and a filter cartridge. The air inlet of the vortex blower is connected to the filter cartridge, and the air outlet of the vortex blower is connected to the tee. The vortex blower can generate high-pressure, high-velocity airflow, and the filter cartridge can filter the air entering the vortex blower.

[0012] Furthermore, two air inlet pipes are spaced apart on the top of the air knife, and the air inlet pipes are connected to the air knife. The two ends of the ventilation pipe are connected to the air inlet pipe and the tee respectively. The high-pressure, high-speed airflow generated by the vortex blower is transported to the inside of the air knife through the ventilation pipe and the air inlet pipe.

[0013] The beneficial effects of this utility model through the above technical solution are as follows:

[0014] This utility model has a reasonable structure and good performance. It can effectively remove residual moisture from the surface of aluminum sheets after polishing. While drying the residual moisture, it can also clean the residual aluminum shavings on the surface of the aluminum sheets. It can prevent watermarks from being left on the surface of the aluminum sheets after drying, and prevent blistering after the aluminum sheet is coated. Cleaning the residual aluminum shavings on the surface of the aluminum sheets can prevent scratches from appearing on the surface of the aluminum sheets, thus improving the production quality of aluminum sheets.

[0015] This invention effectively removes residual moisture from the surface of aluminum sheets through water-absorbing mechanisms on the upper and lower frames, allowing the blowing mechanisms on the upper and lower frames to remove the residual moisture and thus dry the aluminum sheets. The polished aluminum sheets pass through the water-absorbing mechanisms on the upper and lower frames, where a sponge sleeve on the outside of the steel roller absorbs residual moisture from the roller's surface. The steel roller shaft is rotatably connected to a bearing housing via bearings, allowing the roller to rotate as the aluminum sheet passes through, effectively absorbing residual moisture from the aluminum sheet's surface.

[0016] The air supply component of this utility model's purging mechanism provides air to the purging component. The vortex fan of the air supply component can generate high-pressure, high-speed airflow, and the filter cylinder can filter the air entering the vortex fan. The width of the lower part of the air knife of the purging component gradually decreases, which accelerates the air delivered by the vortex fan to the air knife inside the air knife, forming a uniform, high-speed airflow that is ejected from the bottom of the air knife to quickly blow away the moisture and aluminum chips on the surface of the aluminum plate, achieving the effect of drying the moisture on the surface of the aluminum plate and cleaning the aluminum chips on the surface of the aluminum plate. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a polishing machine plate cleaning device according to the present invention. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the structure of a polishing machine plate cleaning device according to the present invention. Figure 2 (Excluding vortex blowers);

[0019] Figure 3 This is a schematic diagram of the structure of a polishing machine plate cleaning device according to the present invention. Figure 3 (Excluding vortex blowers);

[0020] Figure 4 This is a schematic diagram of the structure of a polishing machine plate cleaning device according to the present invention. Figure 4 (Excluding vortex blowers);

[0021] Figure 5 yes Figure 1 Enlarged structural diagram at point A;

[0022] Figure 6 yes Figure 2 Enlarged structural diagram at point B;

[0023] Figure 7 yes Figure 2 A magnified structural diagram at point C.

[0024] The numbers in the attached diagram are as follows: 1 is the upper frame, 2 is the lower frame, 3 is the steel roller, 4 is the sponge sleeve, 5 is the steel roller shaft, 6 is the adjusting groove, 7 is the bearing seat, 8 is the bearing, 9 is the L-shaped seat, 10 is the adjusting screw, 11 is the mounting block, 12 is the locking nut, 13 is the air knife, 14 is the air inlet pipe, 15 is the ventilation pipe, 16 is the vortex blower, 17 is the tee, and 18 is the filter screen cylinder. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0026] like Figures 1 to 7As shown, a polishing machine panel cleaning device includes a polishing machine frame, which includes an upper frame 1 and a lower frame 2. Both the upper frame 1 and the lower frame 2 are equipped with water suction mechanisms, which are arranged vertically opposite each other. Each water suction mechanism includes a steel roller 3 and a sponge sleeve 4. The steel roller 3 is rotatably mounted inside the polishing machine frame, and the sponge sleeve 4 is fitted over the outside of the steel roller 3. Both ends of the steel roller 3 are connected to steel roller shafts 5, and the steel roller shafts 5 are connected to height adjustment components. In this embodiment, after the polishing machine polishes the aluminum sheet, it passes through two water-absorbing mechanisms. These mechanisms effectively remove residual moisture from the surface of the aluminum sheet, facilitating the removal of this moisture by the blowing mechanism. Specifically, the water-absorbing mechanism on the upper frame 1 effectively removes residual moisture from the upper surface of the aluminum sheet, while the water-absorbing mechanism on the lower frame 2 effectively removes residual moisture from the lower surface. The steel rollers 3 of the two water-absorbing mechanisms are rotatably installed within the upper frame 1 and lower frame 2, respectively. The sponge sleeve 4 helps to remove residual moisture from the surface of the aluminum sheet. Height adjustment components at both ends of the steel rollers 3 of the two water-absorbing mechanisms are installed on both sides of the upper frame 1 and lower frame 2, respectively. These height adjustment components allow for adjustment of the height of the steel rollers 3, thereby adjusting the distance between the two water-absorbing mechanisms to accommodate aluminum sheets of different thicknesses.

[0027] The upper frame 1 and the lower frame 2 are each provided with a purging mechanism at intervals. The purging mechanism includes a purging component and an air supply component. The purging component includes an air knife 13 and a ventilation pipe 15. The air knife 13 is fixedly installed inside the polishing machine frame and is inclined. One end of the ventilation pipe 15 is connected to the air knife 13 and the other end is connected to the air supply component. In this embodiment, there are two blowing mechanisms on the upper frame 1 and the lower frame 2. The purpose is to improve the effect of removing residual moisture and aluminum shavings from the surface of the aluminum sheet. The blowing mechanism on the upper frame 1 can remove residual moisture and aluminum shavings from the upper surface of the aluminum sheet, and the blowing mechanism on the lower frame 2 can remove residual moisture and aluminum shavings from the lower surface of the aluminum sheet. The angle between the air knife 13 and the horizontal plane is an acute angle, and the air knife 13 is installed at an angle towards the direction of aluminum sheet transmission. The air supply assembly can generate high-pressure, high-speed airflow, which is delivered to the air knife 13 through the ventilation pipe 15. After the airflow is delivered into the air knife 13, it can be accelerated to form a uniform high-speed airflow and sprayed out from the bottom of the air knife 13 to remove residual moisture and aluminum shavings from the surface of the aluminum sheet, thereby achieving the effect of drying the moisture on the surface of the aluminum sheet and cleaning the aluminum shavings on the surface of the aluminum sheet.

[0028] Adjustment grooves 6 are provided at the bottom of the upper frame 1 and the top of the lower frame 2, corresponding to the positions of the steel roller shaft 5. One end of the steel roller shaft 5 passes through the adjustment groove 6 and connects to the height adjustment component. In this embodiment, the adjustment grooves 6 on the upper frame 1 and the lower frame 2 correspond to each other vertically. The cooperation between the adjustment grooves 6 and the steel roller shaft 5 facilitates the adjustment of the height of the steel roller 3 by the height adjustment component, thereby achieving the effect of adjusting the distance between the steel rollers 3 of the two water suction mechanisms.

[0029] The height adjustment assembly includes a bearing seat 7, a bearing 8, an L-shaped seat 9, and a mounting block 11. The steel roller shaft 5 is rotatably connected to the bearing seat 7 via the bearing 8. The L-shaped seats 9 are provided on both sides of the bearing seat 7, and the bearing seat 7 is slidably mounted on the L-shaped seats 9. In this embodiment, the cooperation between the bearing 8, the steel roller shaft 5, and the bearing seat 7 allows the steel roller 2 to rotate as the aluminum sheet passes through it, effectively absorbing residual moisture on the surface of the aluminum sheet. The L-shaped seats 9 of the height adjustment assemblies of the two water absorption mechanisms are bolted to the outer sides of the upper frame 1 and the lower frame 2, respectively. The bearing seat 7 has grooves on both sides that match the horizontal portion of the L-shaped seat 9, facilitating the sliding of the bearing seat 7 and enabling easy adjustment of the height of the steel roller 3.

[0030] The mounting block 11 is fixedly installed on the outside of the polishing machine frame. An adjusting screw 10 is slidably mounted on the mounting block 11. One end of the adjusting screw 10 is connected to the bearing seat 7. The top and bottom of the mounting block 11 are provided with locking nuts 12 that are threadedly connected to the adjusting screw 10. In this embodiment, the mounting blocks 11 of the height adjustment components of the two water suction mechanisms are respectively bolted to the outside of the upper frame 1 and the lower frame 2. The mounting block 11 has a through hole for the adjusting screw 10 to pass through. The adjusting screw 10 is connected to the bearing seat 7 through a nut. The bearing seat 7 has a square hole. One end of the adjusting screw 10 extends into the square hole. The locking nut 12 locks the adjusting screw 10.

[0031] The air knife 13 of the blowing mechanism on the upper frame 1 is inclined downwards, while the air knife 13 of the blowing mechanism on the lower frame 2 is inclined upwards. The air knife 13 is a hollow shell structure with an opening at the bottom. The cross-section of the air knife 13 is square at the top and triangular at the bottom, with the width of the lower part of the air knife 13 gradually decreasing. In this embodiment, the purpose of the gradually decreasing width of the lower part of the air knife 13 is to further accelerate the airflow output by the vortex blower 16 into the air knife 13, forming a uniform, high-speed airflow that is ejected from the bottom of the air knife 13 to quickly blow away the moisture and aluminum chips on the surface of the aluminum plate, thereby achieving the effect of drying the moisture on the surface of the aluminum plate and cleaning the aluminum chips on the surface of the aluminum plate.

[0032] The air supply assembly includes a vortex blower 16, a three-way valve 17, and a filter cylinder 18. The air inlet of the vortex blower 16 is connected to the filter cylinder 18, and the air outlet of the vortex blower 16 is connected to the three-way valve 17. In this embodiment, the vortex blower 16 can generate high-pressure, high-velocity airflow, and the filter cylinder 18 can filter the air entering the vortex blower 16 to prevent impurities in the air from being blown onto the surface of the aluminum sheet.

[0033] The top of the air knife 13 is provided with two air inlet pipes 14 spaced apart, and the air inlet pipes 14 are connected to the air knife 13. The two ends of the ventilation pipe 15 are connected to the air inlet pipes 14 and the tee 17, respectively. In this embodiment, the high-pressure, high-speed airflow generated by the vortex blower 16 is simultaneously transported to the interior of the air knife 13 through the tee 17, the two ventilation pipes 15, and the air inlet pipes 14, so that the air knife can evenly spray the high-pressure, high-speed airflow from its bottom.

[0034] The working principle of this utility model is as follows: First, adjust the distance between the steel rollers 3 of the two water-absorbing mechanisms according to the thickness of the polished aluminum sheet to ensure that the aluminum sheet can pass between the steel rollers 3 of the two water-absorbing mechanisms. When adjusting the height of the steel rollers 3 of the water-absorbing mechanism on the upper frame 1, simultaneously operate the two height adjustment components on both sides of the upper frame 1. When raising the height of the steel rollers 3 of the water-absorbing mechanism on the upper frame 1, rotate the locking nut 12 located below the mounting block 11 downwards. After the locking nuts 12 of both height adjustment components reach the required height, simultaneously pull the adjusting screws 10 of the two height adjustment components upwards. The adjusting screws 10 drive the bearing seat 7 to move upwards. The bearing seat 7 slides upwards on the L-shaped seat 9. The bearing seat 7 passes through the shaft. The bearing 8 drives the steel roller shaft 5 to move upward, thereby raising the height of the steel roller 3 of the water suction mechanism. Finally, the adjusting screw 10 is fixed by the locking nut 12 located above the mounting block 11. When lowering the height of the steel roller 3 of the water suction mechanism on the upper frame 1, the locking nut 12 located above the mounting block 11 is rotated upward. After the locking nuts 12 of both height adjustment components reach the required height, the adjusting screw 10 slides downward under the action of gravity. The bearing seat 7 slides downward on the L-shaped seat 9. The bearing seat 7 drives the steel roller shaft 5 to move downward through the bearing 8, thereby lowering the height of the steel roller 3 of the water suction mechanism. Finally, the adjusting screw 10 is fixed by the locking nut 12 located below the mounting block 11.

[0035] When adjusting the height of the steel roller 3 of the suction mechanism on the lower frame 2, two height adjustment components are simultaneously operated on both sides of the lower frame 2. When raising the height of the steel roller 3 of the suction mechanism on the lower frame 2, the locking nut 12 located below the mounting block 11 is rotated downwards. After the locking nuts 12 of both height adjustment components reach the required height, the adjusting screws 10 of the two height adjustment components are pushed upwards simultaneously. The adjusting screws 10 drive the bearing seat 7 to move upwards. The bearing seat 7 slides upwards on the L-shaped seat 9. The bearing seat 7 drives the steel roller shaft 5 to move upwards through the bearing 8, thereby achieving the purpose of raising the height of the steel roller 3 of the suction mechanism. Finally, the height is increased. The adjusting screw 10 can be fixed by the locking nut 12 located above the mounting block 11; when lowering the height of the steel roller 3 of the water suction mechanism on the upper frame 1, rotate the locking nut 12 located above the mounting block 11 upwards. After the locking nuts 12 of both height adjustment components reach the required height, the adjusting screw 10 slides downwards under the action of gravity, and the bearing seat 7 slides downwards on the L-shaped seat 9. The bearing seat 7 drives the steel roller shaft 5 to move downwards through the bearing 8, thereby achieving the purpose of lowering the height of the steel roller 3 of the water suction mechanism. Finally, the adjusting screw 10 can be fixed by the locking nut 12 located below the mounting block 11.

[0036] Turn on the vortex blower 16. The high-pressure, high-speed airflow generated by the vortex blower 16 is simultaneously delivered to the air knife 13 through the three-way valve 17, two ventilation pipes 15, and the air inlet pipe 14. The airflow moves downward inside the air knife 13 and is further accelerated after flowing to the lower part of the air knife 13, forming a uniform, high-speed airflow that is sprayed out at the bottom of the air knife 13. The aluminum sheet polished by the polishing machine passes between the steel rollers 3 of the two water suction mechanisms. The sponge sleeves 4 on the outside of the two steel rollers 3 remove the residual moisture on the surface of the aluminum sheet, so that the subsequent blowing mechanism can remove the residual moisture and aluminum shavings on the surface of the aluminum sheet. The two blowing mechanisms continuously spray uniform, high-speed airflow onto the aluminum sheet, which dries the moisture on the surface of the aluminum sheet and cleans the aluminum sheet. The blowing mechanism on the upper frame 1 removes the residual moisture and aluminum shavings on the upper surface of the aluminum sheet, and the blowing mechanism on the lower frame 2 removes the residual moisture and aluminum shavings on the lower surface of the aluminum sheet.

[0037] The embodiments described above are merely preferred embodiments of the utility model and are not intended to limit the scope of the utility model. Therefore, all equivalent changes or modifications made to the technical solutions described in the scope of the utility model patent application should be included within the scope of the utility model patent application.

Claims

1. A polishing machine deck cleaning device comprising a polishing machine frame, the polishing machine frame comprising an upper frame (1) and a lower frame (2), characterized in that, Both the upper frame (1) and the lower frame (2) are equipped with water suction mechanisms. The two water suction mechanisms are arranged opposite each other. The water suction mechanism includes a steel roller (3) and a sponge sleeve (4). The steel roller (3) is rotatably arranged inside the polishing machine frame. The sponge sleeve (4) is sleeved on the outside of the steel roller (3). Both ends of the steel roller (3) are connected to steel roller shafts (5). The steel roller shafts (5) are connected to height adjustment components. The upper frame (1) and lower frame (2) are each provided with a purging mechanism at intervals. The purging mechanism includes a purging component and an air supply component. The purging component includes an air knife (13) and a ventilation pipe (15). The air knife (13) is fixedly installed inside the polishing machine frame and is inclined. One end of the ventilation pipe (15) is connected to the air knife (13) and the other end is connected to the air supply component.

2. A polishing machine deck cleaning device according to claim 1, wherein, Adjustment grooves (6) are provided at the bottom of the upper frame (1) and the top of the lower frame (2) corresponding to the position of the steel roller shaft (5). One end of the steel roller shaft (5) passes through the adjustment groove (6) and is connected to the height adjustment component.

3. A polishing machine deck cleaning device according to claim 2, wherein, The height adjustment assembly includes a bearing housing (7), a bearing (8), an L-shaped seat (9), and a mounting block (11). The steel roller shaft (5) is rotatably connected to the bearing housing (7) through the bearing (8). The L-shaped seats (9) are provided on both sides of the bearing housing (7), and the bearing housing (7) is slidably mounted on the L-shaped seats (9).

4. A polishing machine deck cleaning device as defined in claim 3, wherein, The mounting block (11) is fixedly installed on the outside of the polishing machine frame. An adjusting screw (10) is slidably installed on the mounting block (11). One end of the adjusting screw (10) is connected to the bearing seat (7). The top and bottom of the mounting block (11) are provided with locking nuts (12) that are threadedly connected to the adjusting screw (10).

5. The polishing machine deck cleaning device of claim 1, wherein, The air knife (13) of the purging mechanism on the upper frame (1) is inclined downward, and the air knife (13) of the purging mechanism on the lower frame (2) is inclined upward; the air knife (13) is a hollow shell structure with an open bottom; the cross-section of the air knife (13) is square at the top and triangular at the bottom, and the width of the lower part of the air knife (13) gradually decreases.

6. A polishing machine deck cleaning device as claimed in claim 5, wherein, The air supply assembly includes a vortex fan (16), a tee (17) and a filter cylinder (18). The air inlet of the vortex fan (16) is connected to the filter cylinder (18), and the air outlet of the vortex fan (16) is connected to the tee (17).

7. A polishing machine deck cleaning device as defined in claim 6, wherein, The top of the air knife (13) is provided with two air inlet pipes (14) spaced apart. The air inlet pipes (14) are connected to the air knife (13). The two ends of the ventilation pipe (15) are connected to the air inlet pipes (14) and the tee (17) respectively.

Images