Independent post-cooling and flash cutting device

Abstract

The present invention relates to the technical field of bottle blowing machines, and specifically to an independent post-cooling and flash cutting device, comprising: a main box, a bottle clamping assembly, a flash cutting assembly and a post-cooling assembly, wherein the bottle clamping assembly for clamping a product is fixedly installed in the main box, the fixed end of the post-cooling assembly is fixedly installed on the inner side of the top of the main box, the movable end of the post-cooling assembly can be telescopically movable in the vertical direction at the top of the product, the flash cutting assembly is fixedly installed on the first fixed plate of the bottle clamping assembly, and the movable end of the flash cutting assembly can be telescopically movable in the horizontal direction at the mouth of the product; the product is fixed by the bottle clamping assembly, the cooling assembly pushes the blow needle to approach the mouth of the product for cooling, and the flash cutting assembly pushes the cutter to cut off the flash. The integrated features of flash cutting and post-cooling, the independent operation mechanism, speed up the machine production cycle, and reduce the bloated structure of the main machine.

Description

Technical Field

[0001] The invention relates to the technical field of bottle blowing machines, in particular to an independent post-cooling and flash cutting device. Background Art

[0002] A bottle blowing machine refers to a machine that blows bottles. The most common explanation is that it is a machine that can blow plastic particles (softened into liquid) or finished bottle embryos into bottles through certain process means. Bottle blowing machines are convenient and fast, with a large molding volume. After their appearance, they replaced most manual bottle blowing and were adopted by most beverage companies. Usually, the extrusion process is to extrude the plastic into the blow mold head through a screw, and then cooperate with the mold below and compressed gas to realize the molding of the product. The extrusion blow molding process consists of five steps: making the plasticized raw materials into plastic embryos; intercepting part of the embryos and cutting the embryos by closing the mold; filling the mold cavity with gas to shape the embryos and cool them; opening the mold and taking out the molded container; trimming the flash to get the finished product.

[0003] Plastic bottle blowing production equipment is used to blow various plastic bottles. The bottle blanks that have just been blown into shape will have flash at the bottle mouth, which needs to be cut off. In the prior art, the post-cooling mechanism and the flash cutting mechanism are mostly directly installed on the bottle blowing machine. After the preform head of the machine extrude the preform, the mold clamping mechanism closes the mold, and then the blow needle inflates, and then the flash is cut, post-cooled, and the robot takes the part, forming a product production cycle. The flash cutting and post-cooling processes follow the cycle time of the machine, which leads to a longer production cycle of the product, and this will cause the overall design of the machine to be too large and the mechanism to be crowded and complicated.

[0004] In view of this, there is an urgent need for an independent post-cooling and flash cutting device, which integrates the features of flash cutting and post-cooling, an independent operating mechanism, speeds up the machine production cycle, and reduces the bloated structure of the main machine. Summary of the invention

[0005] In order to solve the above deficiencies in the prior art, the purpose of the present invention is to provide an independent post-cooling and flash cutting device, which integrates the characteristics of flash cutting and post-cooling, an independent operating mechanism, speeds up the machine production cycle, and reduces the bloated main machine structure.

[0006] In order to achieve the above-mentioned objectives, the technical solution of the present invention is: an independent post-cooling and flash cutting device, comprising: a main box, a bottle clamping assembly, a flash cutting assembly and a post-cooling assembly, the bottle clamping assembly for clamping the product is fixedly installed in the main box, the fixed end of the post-cooling assembly is fixedly installed on the inner side of the top of the main box, the movable end of the post-cooling assembly can be telescopically movable in the vertical direction at the top of the product, the flash cutting assembly is fixedly installed on the first fixed plate of the bottle clamping assembly, and the movable end of the flash cutting assembly can be telescopically movable in the horizontal direction at the bottle mouth of the product; the product is fixed by the bottle clamping assembly, the post-cooling assembly pushes the blow needle to approach the bottle mouth of the product for cooling, and the flash cutting assembly pushes the cutter to cut off the flash.

[0007] Preferably, the main box includes: a bracket, an appearance protection sheet metal, an electric box, a PC board, a hopper, a slide and shock-absorbing feet. The hopper is fixedly installed on the top surface of the electric box, the bracket is fixedly installed at the four corners of the top surface of the electric box, the PC board is fixedly installed on the top of the bracket, the slide is fixedly installed on the side of the electric box, the shock-absorbing feet are fixedly installed at the four corners of the bottom of the electric box, and the appearance protection sheet metal is fixedly installed on both sides and the back of the electric box.

[0008] Furthermore, a groove is provided at the center of the hopper in the horizontal direction, and notches matching with the groove are provided on both sides of the bracket.

[0009] Furthermore, the electrical box is provided with pipelines for driving the bottle clamping assembly, the post-cooling assembly and the flash cutting assembly.

[0010] Preferably, the bottle clamping assembly comprises: a mold overlay mounting plate, a first fixed plate, a mounting frame, a Y-axis moving mechanism and a mold overlay mounting plate moving mechanism, the first fixed plate is slidably connected to the guide column of the mounting frame through a first guide sleeve, and the first fixed plate is fixedly mounted on the first guide sleeve; the mold overlay mounting plate is fixedly mounted at the movable end of the mold overlay mounting plate moving mechanism, and the mold overlay mounting plate moving mechanism is fixedly mounted on the first fixed plate, and the mold overlay mounting plate can be telescopically moved on the first fixed plate through the mold overlay mounting plate moving mechanism; the bottom of the first fixed plate is connected to the Y-axis moving mechanism, and the first fixed plate can be moved along the Y-axis direction on the guide column through the Y-axis moving mechanism and the first guide sleeve.

[0011] Furthermore, the Y-axis moving mechanism includes: a nut and a screw rod, the screw rod is fixedly mounted on the bottom crossbeam of the mounting frame, and the nut is threadedly connected to the screw rod.

[0012] Furthermore, the moving mechanism of the overmold mounting plate includes: a second guide sleeve, a guide rod, a limit seat, a first cylinder, an overmold and an induction switch, the second guide sleeve is fixedly mounted on the back of the first fixed plate, one end of the guide rod passes through the second guide sleeve and the first fixed plate and is fixedly connected to the overmold mounting plate, the other end of the guide rod is fixedly mounted on the limit seat, an induction switch is arranged on one side of the first cylinder, the fixed end of the first cylinder is fixedly mounted on the back of the first fixed plate, the movable end of the first cylinder passes through the first fixed plate and is fixedly connected to the overmold mounting plate, and the overmold is detachably mounted on the overmold mounting plate.

[0013] Preferably, the flash cutting assembly includes: a second cylinder, a cutter mounting plate, a second fixed plate, a third cylinder, a cutter and a rotating shaft, the fixed end of the second cylinder is fixedly mounted on the second fixed plate, the movable end of the second cylinder passes through the second fixed plate and is fixedly connected to the cutter mounting plate, the third cylinder is fixedly mounted on the cutter mounting plate via a cylinder mounting seat, the cutter is mounted on the cylinder mounting seat via a rotating shaft, the cylinder mounting seat is fixedly mounted on the cutter mounting plate, the movable end of the third cylinder is fixedly connected to the cutter blade, and the cutter can be driven by the third cylinder to rotate around the rotating shaft, thereby changing the position of the blade.

[0014] Preferably, the post-cooling assembly includes: a fourth cylinder, a blow needle mounting plate, a third fixed plate, a connecting head, a connecting plate and a blow needle, the fixed end of the fourth cylinder is fixedly mounted on the back of the third fixed plate, the movable end of the fourth cylinder passes through the third fixed plate and is fixedly connected to the connecting head, the connecting head is fixedly connected to the connecting plate, the connecting plate is fixedly mounted on the back of the blow needle mounting plate, the blow needle is fixedly mounted on the blow needle mounting plate, the fourth cylinder can drive the blow needle mounting plate to move in the Y-axis direction, and the blow needle mounting plate drives the blow needle to approach the product bottle mouth for cooling operation.

[0015] Beneficial effects:

[0016] The independent post-cooling and flash cutting device provided by the present invention integrates the flash cutting and post-cooling functions into one, realizes the two processes to work independently in one device, speeds up the production cycle of products, and reduces the bloated structure of the main machine. According to the customer's factory conditions and layout conditions, multiple machines can be connected by conveyor belts to realize parallel processing of product flash and post-cooling, improve production efficiency, and reduce process costs and labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the independent post-cooling and flash cutting device of the present invention;

[0018] Figure 2It is a three-dimensional schematic diagram of the bottle clamping assembly of the independent post-cooling and flash cutting device of the present invention;

[0019] Figure 3 It is a three-dimensional schematic diagram of the bottle clamping assembly structure of the independent post-cooling and flash cutting device of the present invention;

[0020] Figure 4 It is a schematic diagram of the bottle clamping principle of the bottle clamping assembly of the independent post-cooling and flash cutting device of the present invention;

[0021] Figure 5 It is a three-dimensional schematic diagram of the flash cutting assembly of the independent post-cooling and flash cutting device of the present invention;

[0022] Figure 6 It is a three-dimensional schematic diagram of the after-cooling assembly of the independent after-cooling and flash cutting device of the present invention;

[0023] Markings in the figure: 1-main chassis, 2-bottle clamping assembly, 3-flash cutting assembly, 4-rear cooling assembly, 11-bracket, 12-appearance protection sheet metal, 13-electrical box, 14-PC board, 15-hopper, 16-chute, 17-shock-absorbing foot, 21-overmold mounting plate, 22-first fixed plate, 23-mounting frame, 24-Y-axis moving mechanism, 25-overmold mounting plate moving mechanism, 26-guide column, 27-first guide sleeve, 31-second cylinder, 32-cutter mounting plate , 33-second fixed plate, 34-third cylinder, 35-cutter, 36-rotating shaft, 37-mounting seat, 41-fourth cylinder, 42-blow needle mounting plate, 43-third fixed plate, 44-connecting head, 45-connecting plate, 46-blow needle, 151-groove, 111-notch, 241-nut, 242-screw, 251-second guide sleeve, 252-guide rod, 254-limiting seat, 255-first cylinder, 256-mold, 257-induction switch. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the protection scope of the present invention.

[0025] As shown in the figure, the present invention discloses an independent post-cooling and flash cutting device, comprising: a main box 1, a bottle clamping assembly 2, a flash cutting assembly 3 and a post-cooling assembly 4, wherein the bottle clamping assembly 2 for clamping the product is fixedly installed in the main box 1, the fixed end of the post-cooling assembly 4 is fixedly installed on the inner side of the top of the main box 1, and the movable end of the post-cooling assembly 4 can be telescopically movable in the vertical direction at the top of the product, the flash cutting assembly 3 is fixedly installed on the first fixed plate 22 of the bottle clamping assembly 2, and the movable end of the flash cutting assembly 3 can be telescopically movable in the horizontal direction at the bottle mouth of the product; the product is fixed by the bottle clamping assembly 2, the post-cooling assembly 4 pushes the blow needle 46 to approach the bottle mouth of the product for cooling, and the flash cutting assembly 3 pushes the cutter 35 to cut off the flash.

[0026] In this embodiment, the main box 1 includes: a bracket 11, an appearance protection sheet metal 12, an electric box 13, a PC board 14, a hopper 15, a slide 16 and a shock-absorbing foot 17. The hopper 15 is fixedly installed on the top surface of the electric box 13, the bracket 11 is fixedly installed at the four corners of the top surface of the electric box 13, the PC board 14 is fixedly installed on the top of the bracket 11, the slide 16 is fixedly installed on the side of the electric box 13, the shock-absorbing foot 17 is fixedly installed at the four corners of the bottom of the electric box 13, and the appearance protection sheet metal 12 is fixedly installed on both sides and the back of the electric box 13.

[0027] Furthermore, a groove 151 is horizontally formed at the center of the hopper 15 , and notches 111 matching the groove 151 are formed on both sides of the bracket 11 .

[0028] Furthermore, the electrical box 13 is provided with pipelines for driving the bottle clamping assembly 2 , the post-cooling assembly 4 and the flash trimming assembly 3 .

[0029] In this embodiment, the bottle clamping assembly 2 includes: a mold covering mounting plate 21, a first fixed plate 22, a mounting frame 23, a Y-axis moving mechanism 24 and a mold covering mounting plate moving mechanism 25, the first fixed plate 22 is slidably connected to the guide column 26 of the mounting frame 23 through a first guide sleeve 27, and the first fixed plate 22 is fixedly mounted on the first guide sleeve 27; the mold covering mounting plate 21 is fixedly mounted at the movable end of the mold covering mounting plate moving mechanism 25, and the mold covering mounting plate moving mechanism 25 is fixedly mounted on the first fixed plate 22, and the mold covering mounting plate 21 can be telescopically moved on the first fixed plate 22 through the mold covering mounting plate moving mechanism 25; the bottom of the first fixed plate 22 is connected to the Y-axis moving mechanism 24, and the first fixed plate 22 can be moved along the Y-axis direction on the guide column 26 through the Y-axis moving mechanism 24 and the first guide sleeve 27.

[0030] Furthermore, the Y-axis moving mechanism 24 includes: a nut 241 and a screw rod 242 , the screw rod 242 is fixedly mounted on the bottom crossbeam of the mounting frame 23 , and the nut 241 is threadedly connected to the screw rod 242 .

[0031] Furthermore, the overmold mounting plate moving mechanism 25 includes: a second guide sleeve 251, a guide rod 252, a limit seat 254, a first cylinder 255, an overmold 256 and an induction switch 257. The second guide sleeve 251 is fixedly mounted on the back of the first fixed plate 22, one end of the guide rod 252 passes through the second guide sleeve 251 and the first fixed plate 22 and is fixedly connected to the overmold mounting plate 21, the other end of the guide rod 252 is fixedly mounted with the limit seat 254, an induction switch 257 is arranged on one side of the first cylinder 255, the fixed end of the first cylinder 255 is fixedly mounted on the back of the first fixed plate 22, the movable end of the first cylinder 255 passes through the first fixed plate 22 and is fixedly connected to the overmold mounting plate 21, and the overmold 256 is detachably mounted on the overmold mounting plate 21.

[0032] In this embodiment, the flash cutting assembly 3 includes: a second cylinder 31, a cutter mounting plate 32, a second fixed plate 33, a third cylinder 34, a cutter 35 and a rotating shaft 36. The fixed end of the second cylinder 31 is fixedly mounted on the second fixed plate 33, the movable end of the second cylinder 31 passes through the second fixed plate 33 and is fixedly connected to the cutter mounting plate 32. The third cylinder 34 is fixedly mounted on the cutter mounting plate 32 through a cylinder mounting seat 37. The cutter 35 is mounted on the cylinder mounting seat 37 through a rotating shaft 36. The cylinder mounting seat 37 is fixedly mounted on the cutter mounting plate 32. The movable end of the third cylinder 34 is fixedly connected to the blade surface of the cutter 35. The cutter 35 can be driven by the third cylinder 34 to rotate around the rotating shaft 36, thereby changing the blade position.

[0033] In this embodiment, the post-cooling assembly 4 includes: a fourth cylinder 41, a blow needle mounting plate 42, a third fixed plate 43, a connecting head 44, a connecting plate 45 and a blow needle 46. The fixed end of the fourth cylinder 41 is fixedly mounted on the back of the third fixed plate 43, the movable end of the fourth cylinder 41 passes through the third fixed plate 43 and is fixedly connected to the connecting head 44, the connecting head 44 is fixedly connected to the connecting plate 45, the connecting plate 45 is fixedly mounted on the back of the blow needle mounting plate 42, the blow needle 46 is fixedly mounted on the blow needle mounting plate 42, the fourth cylinder 41 can drive the blow needle mounting plate 42 to move in the Y-axis direction, and the blow needle mounting plate 42 drives the blow needle 46 to approach the product bottle mouth for cooling operation.

[0034] Example 1

[0035] In the actual work process, Figure 2 As shown, when the machine is running, the product is input into the independent post-cooling and flash cutting device through the conveyor belt, and the bottle clamping assembly 2 is used to position and fix the product; first, since a groove 151 is opened in the horizontal direction at the center of the hopper 15, and notches 111 matching the groove 151 are arranged on both sides of the bracket 11, the product is input into the independent post-cooling and flash cutting device through the conveyor belt from the notches 111. Bottle clamping assemblies 2 are installed on both sides of the groove 151 of the hopper 15, and a covering mold 256 is fixedly installed on the covering mold mounting plate 21 of the bottle clamping assembly 2. At this time, the first cylinder 255 is started, and the first cylinder 255 will push the covering molds 256 and the covering mold mounting plate 21 of the two groups of bottle clamping assemblies 2 to move toward each other until the covering mold 256 fixes the product firmly. Among them, since the Y-axis moving mechanism 24 is composed of a nut 241 and a screw rod 242, the relative position of the first fixed plate 22 on the Y-axis can be adjusted by rotating the nut 241, and the first fixed plate 22 is fixedly connected with the guide sleeve, and the guide sleeve is slidably connected with the guide rod 252. When the relative position of the first fixed plate 22 on the Y-axis is changed, the relative position of the first fixed plate 22 and the mounting frame 23 on the Y-axis can be changed without changing the position of the mounting frame 23. The induction switch 257 set on one side of the first cylinder 255 plays the role of controlling the opening and closing of the first cylinder 255. When it is sensed that the product has reached the preset position, the induction switch 257 starts the first cylinder 255, and through the telescopic control of the first cylinder 255, the left and right bottle clamping assemblies 2 are used to position and fix the product.

[0036] like Figure 3 As shown, after the bottle clamping assembly 2 positions and fixes the product, the flash cutting assembly 3 is used to cut the flash of the product bottle mouth; first, the second cylinder 31 is started to push the cutter mounting plate 32, and the cutter mounting plate 32 drives the cutter 35 to the corresponding position of the product bottle mouth, and the third cylinder 34 is started, and the movable end of the third cylinder 34 pushes the blade of the cutter 35, thereby driving the blade of the cutter 35 to rotate along the rotating shaft 36 to realize the cutting process of the bottle mouth flash. The flash scraps cut by the flash cutting assembly 3 fall on the hopper 15 and are sent to the flash conveyor belt through the chute 16.

[0037] like Figure 4 As shown, after completing the above operations, the post-cooling assembly 4 is used to cool the product; first, the fourth cylinder 41 is used to push the connecting head 44 and the connecting plate 45, and the connecting plate 45 drives the blowing needle 46 installed on the connecting plate 45. Under the power transmission of the fourth cylinder 41, the blowing needle 46 approaches the bottle mouth of the product for cooling operation.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. All modifications, equivalent substitutions, improvements, etc. within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Independent post-cooling and flash cutting device, characterized in that: include: A main box (1), a bottle clamping assembly (2), a flash cutting assembly (3) and a post-cooling assembly (4), wherein the bottle clamping assembly (2) for clamping a product is fixedly installed in the main box (1), the post-cooling assembly (4) has a fixed end fixedly installed on the inner side of the top of the main box (1), and the movable end of the post-cooling assembly (4) can be telescopically movable in the vertical direction at the top of the product, the flash cutting assembly (3) is fixedly installed on the first fixed plate (22) of the bottle clamping assembly (2), and the movable end of the flash cutting assembly (3) can be telescopically movable in the horizontal direction at the mouth of the product; the product is fixed by the bottle clamping assembly (2), the post-cooling assembly (4) pushes the blow needle (46) close to the mouth of the product for cooling, and the flash cutting assembly (3) pushes the cutter (35) to cut off the flash; The bottle clamping assembly (2) comprises: a mold-covering mounting plate (21), a first fixed plate (22), a mounting frame (23), a Y-axis moving mechanism (24) and a mold-covering mounting plate moving mechanism (25); the first fixed plate (22) is slidably connected to a guide column (26) of the mounting frame (23) through a first guide sleeve (27); the first fixed plate (22) is fixedly mounted on the first guide sleeve (27); the mold-covering mounting plate (21) is fixedly mounted at a movable end of the mold-covering mounting plate moving mechanism (25); the mold-covering mounting plate (21) can be telescopically moved on the first fixed plate (22) through the mold-covering mounting plate moving mechanism (25); the bottom of the first fixed plate (22) is connected to the Y-axis moving mechanism (24); the first fixed plate (22) can be moved on the guide column (26) along the Y-axis direction through the Y-axis moving mechanism (24) and the first guide sleeve (27); The flash cutting assembly (3) comprises: a second cylinder (31), a cutter mounting plate (32), a second fixed plate (33), a third cylinder (34), a cutter (35) and a rotating shaft (36); the fixed end of the second cylinder (31) is fixedly mounted on the second fixed plate (33); the movable end of the second cylinder (31) passes through the second fixed plate (33) and is fixedly connected to the cutter mounting plate (32); the third cylinder (34) is fixedly mounted on the cutter mounting plate (32) via a cylinder mounting seat (37); the cutter (35) is mounted on the cylinder mounting seat (37) via a rotating shaft (36); the cylinder mounting seat (37) is fixedly mounted on the cutter mounting plate (32); the movable end of the third cylinder (34) is fixedly connected to the blade surface of the cutter (35); the cutter (35) can be driven by the third cylinder (34) to rotate around the rotating shaft (36), thereby changing the position of the blade; The post-cooling assembly (4) comprises: a fourth cylinder (41), a blow needle mounting plate (42), a third fixed plate (43), a connecting head (44), a connecting plate (45) and a blow needle (46). The fixed end of the fourth cylinder (41) is fixedly mounted on the back of the third fixed plate (43). The movable end of the fourth cylinder (41) passes through the third fixed plate (43) and is fixedly connected to the connecting head (44). The connecting head (44) is fixedly connected to the connecting plate (45). The connecting plate (45) is fixedly mounted on the back of the blow needle mounting plate (42). The blow needle (46) is fixedly mounted on the blow needle mounting plate (42). The fourth cylinder (41) can drive the blow needle mounting plate (42) to move in the Y-axis direction. The blow needle mounting plate (42) drives the blow needle (46) to approach the product bottle mouth for cooling operation.

2. The independent post-cooling and flash cutting device according to claim 1 is characterized in that: The main box (1) comprises: a bracket (11), an appearance protection sheet metal (12), an electric box (13), a PC board (14), a hopper (15), a slide groove (16) and a shock-absorbing foot (17); the hopper (15) is fixedly mounted on the top surface of the electric box (13); the bracket (11) is fixedly mounted at the four corners of the top surface of the electric box (13); the PC board (14) is fixedly mounted on the top of the bracket (11); the slide groove (16) is fixedly mounted on the side of the electric box (13); the shock-absorbing foot (17) is fixedly mounted at the four corners of the bottom of the electric box (13); and the appearance protection sheet metal (12) is fixedly mounted on both sides and the back of the electric box (13).

3. The independent post-cooling and flash cutting device according to claim 2, characterized in that: A groove (151) is provided at the center of the hopper (15) in the horizontal direction, and notches (111) matching with the groove (151) are provided on both sides of the bracket (11).

4. The independent post-cooling and flash cutting device according to claim 3 is characterized in that: Pipelines for driving the bottle clamping assembly (2), the post-cooling assembly (4) and the flash trimming assembly (3) are arranged in the electrical box (13).

5. The independent post-cooling and flash cutting device according to claim 1, characterized in that: The Y-axis moving mechanism (24) comprises: a nut (241) and a screw rod (242); the screw rod (242) is fixedly mounted on a bottom crossbeam of the mounting frame (23); and the nut (241) is threadedly connected to the screw rod (242).

6. The independent post-cooling and flash cutting device according to claim 1, characterized in that: The overmold mounting plate moving mechanism (25) comprises: a second guide sleeve (251), a guide rod (252), a limit seat (254), a first cylinder (255), an overmold (256) and an induction switch (257); the second guide sleeve (251) is fixedly mounted on the back of the first fixed plate (22); one end of the guide rod (252) passes through the second guide sleeve (251) and the first fixed plate (22) to be fixedly connected to the overmold mounting plate (21); the other end of the guide rod (252) is fixedly mounted on the limit seat (254); one side of the first cylinder (255) is provided with an induction switch (257); the fixed end of the first cylinder (255) is fixedly mounted on the back of the first fixed plate (22); the movable end of the first cylinder (255) passes through the first fixed plate (22) to be fixedly connected to the overmold mounting plate (21); and the overmold (256) is detachably mounted on the overmold mounting plate (21).

Images