Semi-automatic quick mounting device for rotating shaft bearing module

Abstract

The utility model relates to the technical field of assembling and processing equipment, and provides a semi-automatic quick mounting device for a rotating shaft bearing module, which can improve the mounting efficiency and reduce the damage to a bearing and a rotating shaft in the mounting process through the mounting of an oil cylinder, and can realize the quick mounting of the rotating shaft bearing module in the manner of hollowing out the interiors of a movable pressing die device and a sleeve. Meanwhile, the installation condition of the bearing can be observed, the weight of the device can be reduced, the installation process is time-saving and labor-saving, the oil cylinder can easily push the movable pressing die to move in the self-lubricating plate, the movable pressing die does not bounce or deviate in the moving process, the bearing is accurately pressed into the rotating shaft, and the bearing can be accurately pressed into the rotating shaft. And the surface of the workpiece is prevented from being damaged, so that the semi-automatic quick mounting effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of assembly and processing equipment, in particular to a semi-automatic rapid installation device for a new type of rotating shaft bearing module applied to a storage vertical warehouse shelf. Background Art

[0002] A rotating shaft bearing installation device is a device or tool used to install and fix bearings on a rotating shaft. This device is usually used in an automated production line or mechanical equipment. The rotating shaft bearing installation device is used to assemble bearings at both ends of the rotating shaft to achieve rapid, accurate, and reliable installation of the bearings. The rotating shaft bearing installation device is used to assemble bearings at both ends of the rotating shaft.

[0003] The installation of the rotating shaft bearing is very important. Whether the rotating shaft bearing can be correctly installed determines the bearing life. More importantly, it also determines the operating condition of the rotating shaft and the service life of the machine. The design and use of the rotating shaft bearing installation device need to consider factors such as the type, size, fit tolerance of the bearing, and the structure and size of the rotating shaft. At the same time, in order to ensure the correct installation and service life of the bearing, the bearing needs to be preloaded or pre-tightened after installation to ensure its stability and accuracy. Therefore, actively researching and exploring the correct bearing installation process can better play the role of the rolling bearing, thereby effectively improving the life and performance of the rotating shaft.

[0004] At present, the existing installation of the rotating shaft bearing relies on manual installation by humans and pressure tools, and the installation efficiency of the rotating shaft bearing is relatively low. Therefore, it is necessary to design a set of semi-automatic rapid installation device to complete the installation of two bearings at both ends of the rotating shaft, reduce the labor cost of personnel, and meet the installation quality requirements of the rotating shaft bearing. Therefore, to solve the above technical problems, a semi-automatic rapid installation device for an improved rotating shaft bearing module is developed to overcome the defects in the prior art. Summary of the Utility Model

[0005] The utility model provides a semi-automatic rapid installation device for a rotating shaft bearing module to solve the problem that the existing installation of the rotating shaft bearing relies on manual installation by humans and pressure tools, and the installation efficiency of the rotating shaft bearing is relatively low.

[0006] The utility model provides a semi-automatic rapid installation device for a rotating shaft bearing module, including a base, a pushing device, a supporting device, and a rotating shaft;

[0007] The supporting device and the pushing device are installed on the base;

[0008] The supporting device includes a fixed seat assembly, a fixed pressing plate device, a first support seat, and a second support seat;

[0009] The rotating shaft is inserted and installed in the through holes of the fixed pressing plate device, the first support seat, and the second support seat;

[0010] The fixed seat assembly is used to fix the position of the movable die pressing device, and the fixed pressing plate device, the first support seat and the second support seat are used to fix the position of the rotating shaft;

[0011] Support seat bearing pressing plates are installed on the side walls of both the first support seat and the second support seat, and the position of the fixed pressing plate device on the base is located in the area between the first support seat and the second support seat.

[0012] Further, the support device further includes a fixed card slot and a fixed card slot fixing seat. The fixed card slot is installed at the top of the fixed card slot fixing seat, and the fixed card slot fixing seat is used to support the fixed card slot. The position of the fixed card slot fixing seat on the base is located in the area between the fixed pressing plate device and the second support seat.

[0013] Further, the fixing component includes a guide seat, a guide pressing plate and a self-lubricating plate. The guide pressing plate is installed at the top of the guide seat. The guide seat is provided with a guide seat groove, and the self-lubricating plate is installed at the guide seat groove.

[0014] Further, the fixed pressing plate device includes a fixed pressing plate fixing seat, a fixed pressing plate tightening adjustable handle, a fixed pressing plate tightening block and a fixed pressing plate;

[0015] The fixed pressing plate is installed at the top of the fixed pressing plate fixing seat. The fixed pressing plate fixing seat is used to support the fixed pressing plate. The fixed pressing plate tightening block is installed on the side wall of the fixed pressing plate, and the fixed pressing plate tightening adjustable handle is installed at the top of the fixed pressing plate tightening block. The fixed pressing plate tightening adjustable handle is used to adjust the tightness between the fixed pressing plate tightening block and the fixed pressing plate fixing seat.

[0016] Further, a fixed seat assembly tightening adjustable handle is installed at the top of the guide pressing plate, and the fixed seat assembly tightening adjustable handle is used to adjust the tightness of the guide pressing plate on the guide seat.

[0017] Further, the pushing device includes an oil cylinder, a sleeve guide seat, a sleeve, an oil cylinder guide seat, an oil cylinder bracket and an open-close type oil pipe quick joint;

[0018] The oil cylinder is installed on the oil cylinder bracket. The oil cylinder is connected to the sleeve guide seat. The sleeve is installed on the sleeve guide seat. The sleeve is connected to the oil cylinder guide seat. The open-close type oil pipe quick joint is installed at the top of the oil cylinder.

[0019] Further, the tops of the first support base and the second support base are chamfered. The main bodies of the first support base and the second support base are rectangular, and the number of through holes provided on the first support base and the second support base is two.

[0020] Further, the semi-circular through hole provided at the bottom of the fixed pressing plate fixing seat and the semi-circular through hole provided at the top of the fixed pressing plate set screw combine to form a circular through hole.

[0021] Further, the through hole provided at the top of the fixed card slot is semi-arc-shaped, and the through hole provided at the top of the fixed card slot matches the rotating shaft.

[0022] Further, threaded through holes are uniformly provided on the base.

[0023] The beneficial effects of the present utility model are as follows: A semi-automatic rapid installation device for a rotating shaft bearing module provided by the present utility model. By installing in the way of an oil cylinder, the installation efficiency can be improved, and the damage to the bearing and the rotating shaft during installation can be reduced. By making the moving pressing die device and the sleeve internally hollow, it is convenient for the installation of large rotating shafts. At the same time, the installation situation of the bearing can be observed and the weight of the device itself can be reduced, making the installation process time-saving and labor-saving. The oil cylinder can easily push the moving pressing die to move in the self-lubricating plate, so that the moving pressing die does not produce jumping and deviation during the moving process, and accurately presses the bearing into the rotating shaft, avoiding damage to the workpiece surface, thereby achieving the effect of semi-automatic rapid installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a three-dimensional structure schematic diagram of the present utility model.

[0026] Figure 2 It is a side structure schematic diagram of the present utility model.

[0027] Figure 3 It is a top view structure schematic diagram of the present utility model.

[0028] Figure 4 It is a structure schematic diagram of the fixed component and the moving pressing die device of the present utility model.

[0029] Figure 5 It is a three-dimensional structure schematic diagram of the bottom plate of the present utility model with only the fixed pressing plate device installed.

[0030] Figure 6This is a schematic side view of the bottom plate of the present utility model with only the fixed pressing plate device installed.

[0031] Figure 7 This is a schematic top view of the bottom plate of the present utility model with only the fixed pressing plate device installed.

[0032] Figure 8 This is a schematic three-dimensional view of the fixed component and the movable pressing die device of the present utility model.

[0033] Figure 9 For the present utility model Figure 6 This is a schematic view of the cross-sectional structure at A-A in the present utility model.

[0034] Figure 10 For the present utility model Figure 5 This is a schematic view of the structure at a in the present utility model.

[0035] Illustration: 1. Base, 2. Pushing device, 21. Oil cylinder, 22. Sleeve guide seat, 23. Sleeve, 24. Oil cylinder guide seat, 25. Oil cylinder bracket, 26. Open-close type quick oil pipe joint, 3. Movable pressing die device, 4. Supporting device, 41. Fixed component, 411. Guide seat, 412. Guide pressing plate, 413. Self-lubricating plate, 42. Fixed pressing plate device, 421. Fixed pressing plate fixing seat, 422. Fixed pressing plate tightening and adjustable handle, 423. Fixed pressing plate tightening block, 424. Fixed pressing plate, 43. First support seat, 44. Fixed clamping groove, 45. Second support seat, 46. Support seat bearing pressing plate, 47. Fixed seat component tightening and adjustable handle, 48. Fixed clamping groove fixing seat, 5. Rotating shaft, 6. Split pin, 7. B-type pin shaft, 8. Pull handle, 9. Bearing. Specific embodiments

[0036] To make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below in conjunction with the specific embodiments and corresponding drawings of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model. The following will describe in detail the technical solutions provided by each embodiment of the present utility model with reference to the drawings.

[0037] The present utility model aims at the above-mentioned defects existing in the prior art, and particularly provides a semi-automatic quick installation device for a rotating shaft bearing. By replacing different bearing seats and adjusting the position of the movable pressing die assembly, it is more suitable for installing large rotating shaft bearings with different diameters and lengths. It has the advantages of improving the installation efficiency, reducing the damage to the bearing and the shaft during installation, avoiding the difficulty of pressing the bearing during installation, and being simple and quick to operate.

[0038] A semi - automatic rapid installation device for a rotating shaft bearing module provided by the utility model includes a base 1, a pushing device 2, a supporting device 4 and a rotating shaft 5. In the technical solution of this application, various devices can be screwed onto the base 1 to achieve the modular effect of the semi - automatic rapid installation device for the rotating shaft bearing module.

[0039] The supporting device 4 and the pushing device 2 are installed on the base 1;

[0040] The supporting device 4 includes a fixed seat assembly 41, a fixed pressing plate device 42, a first support seat 43 and a second support seat 45;

[0041] The rotating shaft 5 is inserted and installed in the through - holes of the fixed pressing plate device 42, the first support seat 43 and the second support seat 45;

[0042] The fixed seat assembly 41 is used to fix the position of the movable die pressing device 3, and the fixed pressing plate device 42, the first support seat 43 and the second support seat 45 are used to fix the position of the rotating shaft 5;

[0043] Support seat bearing pressing plates 46 are installed on the side walls of both the first support seat 43 and the second support seat 45, and the position of the fixed pressing plate device 42 on the base 1 is in the area between the first support seat 43 and the second support seat 45.

[0044] The pushing device 2 is used to provide a thrust for installing the bearing 9 to the movable die pressing device 3. The movable die pressing device 3 is installed on the supporting device 4. The rotating shaft 5 passes through the supporting device 4 and is connected to the movable die pressing device 3. The through - holes of the first support seat 43 and the second support seat 45 match the shape and size of the bearing 9, and the through - hole of the fixed pressing plate device 42 matches the shape and size of the rotating shaft 5. The oil cylinder 21 and the sleeve 23 are connected to provide a thrust for installing the bearing 9 to the movable die pressing device 3. The oil cylinder guide seat 24 and the sleeve guide seat 22 are used to position the oil cylinder 21. By adjusting the position of the movable die pressing device 3, the position of the bearing 9 installed on the rotating shaft 5 is adjusted, so that the assembly of rotating shafts 5 with different lengths is more convenient.

[0045] The fixed seat assembly 41 is used to fix the position of the movable die pressing device 3. The fixed pressing plate device 42, the first support seat 43, the fixed card slot 44 and the second support seat 45 are used to fix the position of the rotating shaft 5. Bearings 9 are installed at the through holes of the first support seat 43 and the second support seat 45. The pushing device 2 provides a thrust force to the movable die pressing device 3 to change the position of the movable die pressing device 3. By adjusting the position of the movable die pressing device 3, the installation position of the bearing 9 on the rotating shaft 5 is adjusted, so that the assembly of rotating shafts 5 with different lengths is more convenient. The installation method of the oil cylinder 21 in the present utility model can improve the installation efficiency and reduce the damage to the bearing 9 and the rotating shaft 5 during installation. By making the movable die pressing device 3 and the inside of the sleeve 23 hollow, it is convenient for the installation of large rotating shafts 5, and at the same time, the installation situation of the bearing 9 can be observed and the weight of the device itself can be reduced. The installation process is time-saving and labor-saving. By positioning with the first support seat 43, the second support seat 45 and the movable die pressing device 3, the surface of the workpiece can also be avoided from being damaged, so as to achieve semi-automatic rapid installation.

[0046] Specifically, the support device 4 further includes a fixed card slot 44 and a fixed card slot fixing seat 48. The fixed card slot 44 is installed at the top of the fixed card slot fixing seat 48. The fixed card slot fixing seat 48 is used to support the fixed card slot 44. The position of the fixed card slot fixing seat 48 on the base 1 is located in the area between the fixed pressing plate device 42 and the second support seat 45. The fixed card slot fixing seat 48 is installed on the base 1, and other related devices can also be installed on the base 1. Operators can select other devices for installation according to actual usage requirements, reflecting the modular effect of the technical solution of this application.

[0047] Specifically, the fixed seat assembly 41 includes a guide seat 411, a guide pressing plate 412 and a self-lubricating plate 413. The guide pressing plate 412 is installed at the top of the guide seat 411. The guide seat 411 is provided with a guide seat groove, and the self-lubricating plate 413 is installed at the guide seat groove. The tightness of the guide pressing plate 412 and the guide seat 411 is adjusted by the locking adjustable handle 47 of the fixed seat assembly. The guide seat groove can be used to contact the side wall of the movable die pressing device 3. The protrusion on the side wall of the movable die pressing device 3 matches the guide seat groove, and the bottom of the side wall of the movable die pressing device 3 contacts the self-lubricating plate 413, and the movable die pressing device 3 slides on the self-lubricating plate 413.

[0048] Specifically, the fixed pressing plate device 42 includes a fixed pressing plate fixing seat 421, a fixed pressing plate locking adjustable handle 422, a fixed pressing plate locking block 423 and a fixed pressing plate 424;

[0049] At the top of the fixed pressure plate fixing seat 421, the fixed pressure plate 424 is installed. The fixed pressure plate fixing seat 421 is used to support the fixed pressure plate 424. On the side wall of the fixed pressure plate 424, the fixed pressure plate locking block 423 is installed. At the top of the fixed pressure plate locking block 423, the fixed pressure plate locking adjustable handle 422 is installed. The fixed pressure plate locking adjustable handle 422 is used to adjust the tightness between the fixed pressure plate locking block 423 and the fixed pressure plate fixing seat 421. The connection between the fixed pressure plate 424 and the fixed pressure plate fixing seat is achieved by inserting the B-type pin shaft 7, and then the B-type pin shaft 7 is fixed by the split pin 6.

[0050] Specifically, at the top of the guiding pressure plate 412, the fixing seat assembly locking adjustable handle 47 is installed. The fixing seat assembly locking adjustable handle 47 is used to adjust the tightness of the guiding pressure plate 412 on the guiding seat 411.

[0051] Specifically, the pushing device 2 includes an oil cylinder 21, a sleeve guiding seat 22, a sleeve 23, an oil cylinder guiding seat 24, an oil cylinder bracket 25, and an open-close type oil pipe quick connector 26;

[0052] The oil cylinder 21 is installed on the oil cylinder bracket 25. The oil cylinder 21 is connected to the sleeve guiding seat 22. The sleeve 23 is installed on the sleeve guiding seat 22. The sleeve 23 is connected to the oil cylinder guiding seat 24. At the top of the oil cylinder 21, the open-close type oil pipe quick connector 26 is installed. The oil cylinder 21 can be a hydraulic cylinder. The oil cylinder guiding seat 24 and the sleeve guiding seat 22 are used to position the oil cylinder 21

[0053] Specifically, the tops of the first support seat 43 and the second support seat 45 are chamfered. The main bodies of the first support seat 43 and the second support seat 45 are rectangular. The number of through holes provided on the first support seat 43 and the second support seat 45 is two. Appropriate through holes can be selected according to actual usage needs for installing the bearing 9 and the rotating shaft 5, increasing the applicability range of the device.

[0054] Specifically, the semi-circular through hole provided at the bottom of the fixed pressure plate fixing seat 421 and the semi-circular through hole provided at the top of the fixed pressure plate locking block 423 combine to form a circular through hole. The rotating shaft 5 can pass through the circular through hole, and the rotating shaft 5 is fixed by the tightly connected fixed pressure plate fixing seat 421 and the fixed pressure plate locking block 423.

[0055] Specifically, the through hole provided at the top of the fixed card slot 44 is semi-circular. The through hole provided at the top of the fixed card slot 44 matches the rotating shaft 5. The rotating shaft 5 passes through the through hole provided at the top of the fixed card slot 44, and the outer wall contour of the through hole provided at the top of the fixed card slot 44 is in matching contact with the rotating shaft 5.

[0056] Specifically, threaded through holes are uniformly arranged on the base 1, and the threaded through holes uniformly arranged on the base 1 can be used to install various devices, thereby achieving the effect of modular installation on the base 1.

[0057] The specific technical solution during the use of the present utility model is that the shapes and sizes of the first support seat 43, the second support seat 45 and the bearing 9 match each other, the shapes and sizes of the fixed pressing plate device 42 and the rotating shaft 5 match each other, the oil cylinder 21 is connected to the sleeve 23 to provide the thrust for installing the bearing 9 to the moving die pressing device 3, the oil cylinder guide seat 24 and the sleeve guide seat 22 are used to position the oil cylinder 21, and the moving die pressing device 3 is connected to the fixed seat assembly 41. By adjusting the position of the moving die pressing device 3, the installation position of the bearing 9 on the rotating shaft 5 can be adjusted, so that the assembly of rotating shafts 5 with different lengths is more convenient.

[0058] In the present utility model, one end of the moving die pressing 3 is connected to the sleeve 23, and the other end of the moving die pressing 3 is connected to the second support seat 45. The oil cylinder 21 drives the sleeve 23 to provide the installation power. The moving die pressing 3 positions the bearing 9 and presses it into the installation position of the rotating shaft 5. The fixing component 41 mainly restricts the position of the moving die pressing 3. The fixed pressing plate locking and adjustable handle 422 on the fixing component 41 is used to adjust the pressure of the fixing component 41 on the moving die pressing 3, so that the oil cylinder 21 can easily push the moving die pressing 3 to move within the self-lubricating plate 413, so that the moving die pressing 3 does not generate jumping and deviation during the moving process, and accurately presses the bearing 9 into the rotating shaft 5. The technical solution of this application is easier than the way of manually pressing the bearing 9 into the rotating shaft 5 by an operator. The technical solution of this application can effectively avoid deformation or damage of the rotating shaft 9 or the bearing 5, etc. At the same time, the installation situation of the bearing 9 can be observed and the weight of the device itself can be reduced, making the installation process time-saving and labor-saving, and solving the problem that the existing installation of the rotating shaft bearing depends on manual installation by people and pressure tools, and the installation efficiency of the rotating shaft bearing is relatively low.

[0059] The above-described embodiments of the present utility model do not constitute a limitation to the protection scope of the present utility model. In addition, in the description of this application, unless otherwise specified, "a plurality" means two or more than two. Additionally, for the convenience of clearly describing the technical solutions of the embodiments of this application, in the embodiments of this application, terms such as "first" and "second" are used to distinguish the same items or similar items with basically the same functions and effects. Those skilled in the art can understand that the terms "first", "second", etc. do not limit the quantity and execution order, and the terms "first", "second", etc. do not necessarily limit to be different. The above-described embodiments of this application do not constitute a limitation to the protection scope of this application.

Claims

1. A semi - automatic rapid installation device for a rotating shaft bearing module, characterized in that, it includes a base (1), a pushing device (2), a supporting device (4) and a rotating shaft (5); The supporting device (4) and the pushing device (2) are installed on the base (1); The supporting device (4) includes a fixed seat assembly (41), a fixed pressing plate device (42), a first supporting seat (43) and a second supporting seat (45); The rotating shaft (5) is inserted and installed in the through - holes of the fixed pressing plate device (42), the first supporting seat (43) and the second supporting seat (45); The fixed seat assembly (41) is used to fix the position of the moving die - pressing device (3), and the fixed pressing plate device (42), the first supporting seat (43) and the second supporting seat (45) are used to fix the position of the rotating shaft (5); Support seat bearing pressing plates (46) are installed on the side walls of the first supporting seat (43) and the second supporting seat (45), and the position of the fixed pressing plate device (42) on the base (1) is in the area between the first supporting seat (43) and the second supporting seat (45); The supporting device (4) further includes a fixed card slot (44) and a fixed card slot fixing seat (48), the fixed card slot (44) is installed at the top of the fixed card slot fixing seat (48), the fixed card slot fixing seat (48) is used to support the fixed card slot (44), and the position of the fixed card slot fixing seat (48) on the base (1) is in the area between the fixed pressing plate device (42) and the second supporting seat (45); The through - hole provided at the top of the fixed card slot (44) is semi - arc - shaped, and the through - hole provided at the top of the fixed card slot (44) matches the rotating shaft (5).

2. The semi - automatic rapid installation device for a rotating shaft bearing module according to claim 1, characterized in that, The fixed seat assembly (41) includes a guiding seat (411), a guiding pressing plate (412) and a self - lubricating plate (413), the guiding pressing plate (412) is installed at the top of the guiding seat (411), the guiding seat (411) is provided with a guiding seat groove, and the self - lubricating plate (413) is installed at the guiding seat groove.

3. The semi - automatic rapid installation device for a rotating shaft bearing module according to claim 1, characterized in that, The fixed pressing plate device (42) includes a fixed pressing plate fixing seat (421), a fixed pressing plate tightening and adjustable handle (422), a fixed pressing plate tightening block (423) and a fixed pressing plate (424); The fixed pressing plate (424) is installed at the top of the fixed pressing plate fixing seat (421), the fixed pressing plate fixing seat (421) is used to support the fixed pressing plate (424), the fixed pressing plate tightening block (423) is installed on the side wall of the fixed pressing plate (424), the fixed pressing plate tightening and adjustable handle (422) is installed at the top of the fixed pressing plate tightening block (423), and the fixed pressing plate tightening and adjustable handle (422) is used to adjust the tightness between the fixed pressing plate tightening block (423) and the fixed pressing plate fixing seat (421).

4. A semi-automatic rapid installation device for a rotating shaft bearing module as described in claim 2, characterized in that, a fixed seat assembly locking and adjustable handle (47) is installed on the top of the guiding pressing plate (412), and the fixed seat assembly locking and adjustable handle (47) is used to adjust the tightness of the guiding pressing plate (412) on the guiding seat (411).

5. A semi-automatic rapid installation device for a rotating shaft bearing module as described in claim 1, characterized in that, the pushing device (2) includes an oil cylinder (21), a sleeve guiding seat (22), a sleeve (23), an oil cylinder guiding seat (24), an oil cylinder bracket (25) and an open-close type oil pipe quick connector (26); the oil cylinder (21) is installed on the oil cylinder bracket (25), the oil cylinder (21) is connected to the sleeve guiding seat (22), the sleeve (23) is installed on the sleeve guiding seat (22), the sleeve (23) is connected to the oil cylinder guiding seat (24), and the open-close type oil pipe quick connector (26) is installed on the top of the oil cylinder (21).

6. A semi-automatic rapid installation device for a rotating shaft bearing module as described in claim 1, characterized in that, the tops of the first support seat (43) and the second support seat (45) are chamfered, the main bodies of the first support seat (43) and the second support seat (45) are rectangular, and the number of through holes provided on the first support seat (43) and the second support seat (45) is two.

7. A semi-automatic rapid installation device for a rotating shaft bearing module as described in claim 3, characterized in that, the semi-circular through hole provided at the bottom of the fixed pressing plate fixed seat (421) and the semi-circular through hole provided at the top of the fixed pressing plate locking block (423) are combined to form a circular through hole.

8. A semi-automatic rapid installation device for a rotating shaft bearing module as described in claim 1, characterized in that, threaded through holes are uniformly provided on the base (1).

Images