A new energy automobile body self-punching riveting defect detection device

Abstract

The present application belongs to the technical field of riveting quality detection, and particularly relates to a new energy automobile body self-punch riveting defect detection device, which comprises a base and further comprises: a rotary support assembly, a rotary angle feedback assembly, a gap size detection assembly, a detection result feedback assembly, a detection position confirmation assembly, a detection unqualified marking assembly and a PLC controller. The present application can quickly detect the riveting gap after the riveting of the new energy automobile body, quickly feedback and warn when the detection result is unqualified, realize detection work at multiple positions, ensure detection quality, determine the angle and number of surrounding detection based on the diameter of the rivet, automatically control the size of the rivet gap based on the thickness of the riveted plate, and automatically mark when the riveting gap size is unqualified, thereby assisting the staff to quickly confirm the position of the unqualified riveting in the subsequent work.

Description

Technical Field

[0001] This invention belongs to the field of riveting quality inspection technology, and in particular relates to a device for detecting defects in self-piercing riveting of new energy vehicle bodies. Background Technology

[0002] In the field of new energy vehicle manufacturing, self-piercing riveting is a core process for connecting body parts. Its forming quality directly affects the safety performance and service life of the entire vehicle. Therefore, self-piercing riveting quality testing equipment plays a crucial role. Body panels and other components of new energy vehicles are mostly formed by combining flat sheet metal through stamping and riveting processes.

[0003] During the riveting process, if insufficient pressure is applied, the rivet cannot undergo sufficient plastic deformation to achieve a tight fit between the plates, resulting in obvious gaps between the plates. If the riveting speed is too fast, the instantaneous impact of the rivet is too great, which can easily lead to insufficient or uneven deformation, making it difficult to effectively fill the gaps. If the riveting speed is too slow, the rivet will generate too much friction and heat during the operation, causing the material properties to deteriorate. Similarly, it will be difficult to form a reliable riveting structure, and it will also easily produce large gaps.

[0004] The core function of riveting is to achieve reliable connection and load transfer between components. Excessive gap reduces the effective contact area between the rivet and the connected parts, significantly increasing local stress and leading to rivet loosening, deformation, or even breakage. This results in a decrease in the overall strength and stability of the connection structure, failing to meet design standards and making it prone to connection failure under heavy loads. Therefore, checking the gap size at the riveting joint is one of the key indicators for evaluating riveting quality.

[0005] Currently, the industry commonly uses the feeler gauge method to measure riveting gaps. A feeler gauge is a conventional testing tool consisting of a set of thin plates of varying thicknesses. During testing, the corresponding plate is inserted into the riveting gap, and the thickness of the plate that allows for smooth insertion with slight resistance is taken as the gap value. This method is simple to operate and low in cost, but it only obtains approximate gap values, has limited accuracy, and is difficult to use in confined spaces or for gaps with irregular shapes. Summary of the Invention

[0006] The purpose of this invention is to address the above-mentioned problems by providing a device for detecting defects in self-piercing riveting joints of new energy vehicle bodies.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a self-piercing riveting defect detection device for new energy vehicle bodies, comprising a base, and further comprising:

[0008] A rotating support assembly is fixedly installed at the upper end of the base;

[0009] A rotation angle feedback component is fixedly installed on the upper end of the base and is connected to the rotation support component in a transmission manner.

[0010] A gap size detection component is fixedly installed at the upper end of the rotating support component;

[0011] The detection result feedback component is fixedly installed at the upper end of the rotating support component and is connected to the gap size detection component in a transmission manner.

[0012] The detection location confirmation component is fixedly installed on the gap size detection component;

[0013] The defective marking component is fixedly installed at the upper end of the rotating support component;

[0014] The PLC controller is fixedly installed on the upper part of the base and is electrically connected to the rotation support component, rotation angle feedback component, gap size detection component, detection result feedback component, detection position confirmation component and detection failure marking component.

[0015] In the aforementioned new energy vehicle body self-piercing riveting defect detection device, such as Figure 3 As shown, the rotating support assembly includes a support shaft rotatably connected to the upper end of the base, a support plate is fixedly mounted on the upper end of the support shaft, a motor drive assembly for driving the support shaft to rotate is fixedly mounted on the upper end of the base, and a plurality of support rollers are fixedly mounted at equal intervals on the lower end of the support plate, which abut against the upper end of the base.

[0016] In the aforementioned new energy vehicle body self-piercing riveting defect detection device, the rotation angle feedback component includes an encoder fixedly installed on the upper end of the base, and the upper input end of the encoder is connected to the support shaft through a sprocket assembly.

[0017] In the aforementioned new energy vehicle body self-piercing riveting defect detection device, the gap size detection component includes a U-shaped fixing plate fixedly installed on the upper end of the support plate, a rotating screw rotatably connected inside the U-shaped fixing plate, a servo motor for driving the rotating screw to rotate is fixedly installed on the outer wall of the U-shaped fixing plate, a movable seat is threadedly sleeved on the rod wall of the rotating screw, and a triangular detection block is fixedly installed on one side of the upper end of the movable seat.

[0018] In the aforementioned new energy vehicle body self-piercing riveting defect detection device, the detection result feedback component includes two symmetrically fixed electric push rods mounted on the upper end of the support plate. The upper moving ends of the two electric push rods are fixedly connected to the same feedback shell. A transmission screw is rotatably connected to the upper side of the inner wall of the feedback shell. One end of the transmission screw extends through the feedback shell and is fixedly connected to a small-diameter gear. One end of the rotating screw is fixedly connected to a large-diameter gear that meshes with the small-diameter gear. A feedback plate is threaded onto the rod wall of the transmission screw. An electric telescopic rod is fixedly inserted into the rear side of the inner wall of the feedback shell. A feedback switch is fixedly connected to the moving end of the electric telescopic rod located inside the feedback shell. The feedback switch is arranged opposite to the feedback plate.

[0019] In the aforementioned new energy vehicle body self-piercing riveting defect detection device, the detection position confirmation component includes a deflection motor fixedly installed on the upper end of the movable seat, a deflection rod fixedly connected to the output end of the deflection motor, and a pressure sensing plate embedded in the upper side wall of the deflection rod.

[0020] In the aforementioned new energy vehicle body self-piercing riveting defect detection device, the defect detection marking component includes an L-shaped upright plate fixedly installed on the upper end of the support plate. Multiple marking nozzles are fixedly inserted at equal intervals on the upper end of the L-shaped upright plate. The lower ends of the multiple marking nozzles are fixedly connected to the same supplementary pipe. The lower end of the supplementary pipe is fixedly connected to a feeding pipe. A feeding pump is installed on the feeding pipe. The feeding pump is fixedly installed on the side wall of the L-shaped upright plate.

[0021] In the aforementioned new energy vehicle body self-piercing riveting defect detection device, the lower end of the movable seat is fixedly connected to a limiting slider, and the upper end of the horizontal part of the U-shaped fixed plate is provided with a limiting groove that matches and slides with the limiting slider.

[0022] Compared with existing technologies, the advantages of this invention are as follows:

[0023] 1. With the set base, rotating support component, gap size detection component, detection result feedback component, and detection position confirmation component, it can quickly detect the riveting gap after riveting of new energy vehicle body. When the detection is unqualified, it can provide timely feedback and issue a warning. At the same time, it supports multi-point synchronous or sequential detection to ensure detection effect and quality. Compared with the traditional feeler gauge detection method, it has higher detection accuracy.

[0024] 2. Through the set rotation angle feedback component, detection result feedback component, and PLC controller, the circumferential detection angle and number of detections can be adaptively set according to the rivet diameter. The larger the rivet diameter, the more circumferential detections are performed, and the smaller the deflection angle of a single detection is, thereby achieving a more comprehensive and detailed detection. At the same time, the allowable gap threshold can be automatically adjusted according to the thickness of the riveted plate: the thicker the plate, the larger the allowable gap value, which can quickly determine the qualified range of riveting gaps corresponding to different plate thicknesses, effectively improving detection efficiency and detection rationality.

[0025] 3. By setting up the non-conforming detection marking component and the detection result feedback component, the system can automatically mark the non-conforming riveting gap when it is detected that the size of the riveting gap is non-conforming, which helps the staff to quickly locate the non-conforming riveting position so as to quickly carry out the corresponding processing work and improve the ease of use. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the working state of the present invention;

[0027] Figure 2 This is a front view structural diagram of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the rotating support assembly of the present invention;

[0029] Figure 4 This is a three-dimensional structural schematic diagram of the rotation angle feedback component of the present invention;

[0030] Figure 5 This is a schematic diagram of the gap size detection component of the present invention;

[0031] Figure 6 This is a cross-sectional structural schematic diagram of the detection result feedback component of the present invention;

[0032] Figure 7 This is a three-dimensional structural diagram of the position detection and confirmation component of the present invention;

[0033] Figure 8 This is a schematic diagram of the structure of the defective marking component of the present invention.

[0034] In the diagram: 1. Base; 2. Rotary support assembly; 21. Support shaft; 22. Support plate; 23. Motor drive assembly; 24. Support roller; 3. Rotation angle feedback assembly; 31. Encoder; 32. Sprocket assembly; 4. Gap size detection assembly; 41. U-shaped fixing plate; 42. Rotating screw; 43. Servo motor; 44. Moving seat; 45. Triangular detection block; 5. Detection result feedback assembly; 51. Electric push rod; 52. Feedback shell; 53. Transmission screw; 54. Small diameter gear; 55. Large diameter gear; 56. Feedback plate; 57. Electric telescopic rod; 58. Feedback switch; 6. Detection position confirmation assembly; 61. Deflection motor; 62. Deflection rod; 63. Pressure sensing plate; 7. Detection failure marking assembly; 71. L-shaped upright plate; 72. Marking nozzle; 73. Replenishment pipe; 74. Feeding pipe; 75. Feeding pump; 8. PLC controller. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0036] like Figures 1-2 As shown, a self-piercing riveting defect detection device for new energy vehicle bodies includes a base 1, and also includes:

[0037] The rotating support assembly 2 is fixedly installed on the upper end of the base 1. The rotating support assembly 2 includes a support shaft 21 rotatably connected to the upper end of the base 1. A support plate 22 is fixedly installed on the upper end of the support shaft 21. A motor drive assembly 23 for driving the support shaft 21 to rotate is fixedly installed on the upper end of the base 1. A plurality of support rollers 24 are fixedly installed at equal intervals on the lower end of the support plate 22, which abut against the upper end of the base 1.

[0038] The rotation angle feedback component 3 is fixedly installed on the upper end of the base 1 and is connected to the rotation support component 2 via a transmission connection. Figure 4 As shown, the rotation angle feedback component 3 includes an encoder 31 fixedly installed on the upper end of the base 1. The upper input end of the encoder 31 is connected to the support shaft 21 via a sprocket assembly 32.

[0039] The gap size detection component 4 is fixedly installed on the upper end of the rotating support component 2, such as... Figure 5As shown, the gap size detection component 4 includes a U-shaped fixing plate 41 fixedly installed on the upper end of the support plate 22. A rotating screw 42 is rotatably connected inside the U-shaped fixing plate 41. A servo motor 43 for driving the rotating screw 42 to rotate is fixedly installed on the outer wall of the U-shaped fixing plate 41. A movable seat 44 is threadedly sleeved on the rod wall of the rotating screw 42. A triangular detection block 45 is fixedly installed on one side of the upper end of the movable seat 44. A limit slider is fixedly connected to the lower end of the movable seat 44. A limit groove matching the limit slider is opened at the upper end of the horizontal part of the U-shaped fixing plate 41.

[0040] The detection result feedback component 5 is fixedly installed on the upper end of the rotating support component 2 and is connected to the gap size detection component 4 via a transmission connection. Figure 6 As shown, the detection result feedback component 5 includes two symmetrically fixed electric push rods 51 mounted on the upper end of the support plate 22. The upper moving ends of the two electric push rods 51 are fixedly connected to the same feedback housing 52. A transmission screw 53 is rotatably connected to the upper side of the inner wall of the feedback housing 52. One end of the transmission screw 53 extends through the feedback housing 52 and is fixedly connected to a small diameter gear 54. One end of the rotating screw 42 is fixedly connected to a large diameter gear 55 that meshes with the small diameter gear 54. A feedback plate 56 is threaded onto the rod wall of the transmission screw 53. An electric telescopic rod 57 is fixedly inserted into the rear side of the inner wall of the feedback housing 52. A feedback switch 58 is fixedly connected to the moving end of the electric telescopic rod 57 located inside the feedback housing 52. The feedback switch 58 is arranged opposite to the feedback plate 56.

[0041] Detection location confirmation component 6, such as Figure 7 As shown, the detection position confirmation component 6 is fixedly installed on the gap size detection component 4. It includes a deflection motor 61 fixedly installed on the upper end of the movable base 44. The output end of the deflection motor 61 is fixedly connected to a deflection rod 62. A pressure sensing plate 63 is embedded in the upper side wall of the deflection rod 62.

[0042] Detection of defective marking component 7, such as Figure 8 As shown, the non-conforming marking component 7 is fixedly installed on the upper end of the rotating support assembly 2. It includes an L-shaped vertical plate 71 fixedly installed on the upper end of the support plate 22. Multiple marking nozzles 72 are fixedly inserted at equal intervals on the upper end of the L-shaped vertical plate 71. The lower ends of the multiple marking nozzles 72 are fixedly connected to the same replenishment pipe 73. The lower end of the replenishment pipe 73 is fixedly connected to a feeding pipe 74. A feeding pump 75 is installed on the feeding pipe 74. The feeding pump 75 is fixedly installed on the side wall of the L-shaped vertical plate 71.

[0043] The PLC controller 8 is fixedly installed on the upper part of the base 1 and is electrically connected to the rotation support component 2, the rotation angle feedback component 3, the gap size detection component 4, the detection result feedback component 5, the detection position confirmation component 6, and the detection failure marking component 7.

[0044] The operating principle of the present invention is described as follows: The riveted plate is moved to the upper side of the entire riveting quality detection device, and the lower plate abuts against the top of the triangular detection block 45. The diameter of the rivet and the thickness of the plate are input into the PLC controller 8. The PLC controller 8 automatically adjusts the rotation angle feedback component 3 and the detection result feedback component 5 based on the input signal. Specifically, the larger the diameter of the rivet, the smaller the angle threshold of each rotation of the support shaft 21 monitored by the encoder 31 controlled by the PLC controller 8. The larger the thickness of the plate, the shorter the distance that the electric telescopic rod 57 controls the feedback switch 58 to move.

[0045] During testing, the PLC controller 8 controls the servo motor 43 to rotate, which in turn drives the rotating screw 42 to rotate. Through the threaded connection between the rotating screw 42 and the moving seat 44, the moving seat 44 moves the triangular detection block 45 towards the rivet position. When the pressure sensing plate 63 on the upper side wall of the deflection rod 62 contacts the rivet's riveting position, the pressure sensing plate 63 receives a pressure signal and feeds it back to the PLC controller 8. The PLC controller 8 then controls the deflection motor 61 to rotate the deflection rod 62 90 degrees, causing it to deflect to a lower position, preventing it from continuing to obstruct the rivet. At this time, the PLC controller 8 controls the electric push rod 51 to push the feedback shell 52 upward, so that the small diameter gear 54 at one end of the transmission screw 53 meshes with the large diameter gear 55 at one end of the rotating screw 42. (During this process, because the transmission screw 53 has its own rotation, the small diameter gear 54 will automatically deflect during the upward movement and meshing with the large diameter gear 55 to achieve a stable meshing connection with the large diameter gear 55. In addition, the installation of the transmission screw 53 has rotational resistance, so that the transmission screw 53 will not rotate due to accidental external contact, thereby changing the position of the feedback plate 56.)

[0046] As the servo motor 43 continues to move, the moving base 44 drives the triangular detection block 45 to continue moving into the gap at the rivet joint to perform the formal gap size detection work. Specifically, the larger the gap at the rivet joint, the greater the distance that the triangular detection block 45 can extend into, until the triangular detection block 45 can no longer move. When the torque sensor installed in the servo motor 43 reaches the threshold torque, it means that the triangular detection block 45 can no longer move. At this time, the PLC controller 8 controls the servo motor 43 to stop moving, completing the unidirectional gap size detection work.

[0047] Furthermore, during formal testing, the meshing of the large-diameter gear 55 and the small-diameter gear 54 transmits the rotational force of the rotating screw 42 to the transmission screw 53, causing the transmission screw 53 to rotate synchronously. This, in turn, causes the feedback plate 56 to move within the feedback housing 52 through the threaded connection between the transmission screw 53 and the feedback plate 56. When the feedback plate 56 can press against the feedback switch 58, it indicates that the gap size at the rivet joint in the current direction is unqualified. At this time, the PLC controller 8 directly controls the servo motor 43 to stop its operation and directly determines that the rivet joint quality is unqualified. Moreover, since the greater the thickness of the plate, the shorter the distance that the electric telescopic rod 57 pushes the feedback switch 58 to move, the greater the distance between the feedback plate 56 and the feedback switch 58. This means that the feedback plate 56 needs to move a greater distance to trigger the feedback switch 58, which means that the gap at the rivet joint is allowed to be larger.

[0048] When the triangular detection block 45 can no longer move and the feedback plate 56 does not press on the feedback switch 58, it indicates that the gap size detection at the riveting point in the current direction is qualified. At this time, the PLC controller 8 controls the servo motor 43 to reverse, first driving the feedback plate 56 to reset to the initial position. After the feedback plate 56 is reset to the initial position, the servo motor 43 can no longer drive the rotating screw 42 to rotate, causing the torque sensor in the servo motor 43 to detect an increase in torque. The PLC controller 8 then controls the electric push rod 51 to drive the feedback shell 52 to move down, causing the small diameter gear 54 to disengage from the meshing connection with the large diameter gear 55, so that the servo motor 43 can drive the rotating screw 42 to continue to reverse, causing the moving seat 44 to drive the triangular detection block 45 to reset to the initial position. The PLC controller 8 also controls the deflection motor 61 to drive the deflection rod 62 to reset and rotate 90 degrees, so that all detection mechanisms return to the initial position.

[0049] The PLC controller 8 then controls the motor drive assembly 23 to drive the support shaft 21 to rotate. The support shaft 21 drives the support plate 22 to rotate. Multiple support rollers 24 are installed at the lower end of the support plate 22 to provide support. The rotation angle of the support shaft 21 is transmitted to the input end of the encoder 31 through the sprocket assembly 32. Based on a preset deflection angle threshold, when the support shaft 21 drives the support plate 22 to rotate to a preset angle, the encoder 31 sends a feedback signal to the PLC controller 8. The PLC controller 8 then controls the motor drive assembly 23 to stop, thus stopping the gap size detection group. Component 4 moves again to the next detection position at the rivet joint and repeats the above detection work. Specifically, when the diameter of the rivet is larger, the PLC controller 8 controls the encoder 31 to detect a smaller deflection angle threshold each time, so that the support shaft 21 stops working when it rotates a smaller angle, thereby realizing more times of gap size detection work. Because the larger the diameter of the rivet, the larger the riveting range, more times of detection work are needed to ensure detection accuracy. Until the encoder 31 detects that the support shaft 21 has rotated one revolution and completed the detection work in all directions, it means that the current riveting position has completed the detection work.

[0050] When the feedback switch 58 is pressed and triggered, indicating that the current riveting position is not up to standard, the PLC controller 8 controls the feed pump 75 to work for 5 seconds. The feed pump 75 delivers the pigment stored in the pigment storage tank connected to one end of the feed pipe 74 to the replenishment pipe 73, and then sprays it out through multiple marking nozzles 72 to quickly mark the riveting position of the rivet. This helps the staff to quickly confirm the location of the riveting failure and then carry out the corresponding processing work quickly, which is convenient for use.

[0051] Additionally, the technical solution of this application is aimed at the riveting inspection of flat plates. For the riveting quality inspection of irregularly shaped curved plates, the top of the triangular detection block 45 can be designed to fit the plate, and the movement path of the gap size detection component 4 can be designed to fit the curvature of the plate, thereby meeting the inspection requirements for plates with different curvatures.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for detecting defects in self-piercing riveting joints of new energy vehicle bodies, comprising a base (1), characterized in that, Also includes: The rotating support assembly (2) includes a support shaft (21) rotatably connected to the upper end of the base (1), a support plate (22) is fixedly mounted on the upper end of the support shaft (21), and a motor drive assembly (23) for driving the support shaft (21) to rotate is fixedly mounted on the upper end of the base (1). The rotation angle feedback component (3) is fixedly installed on the upper end of the base (1) and is connected to the rotation support component (2) in a transmission manner. The gap size detection component (4) includes a U-shaped fixing plate (41) fixedly installed on the upper end of the support plate (22), a rotating screw (42) is rotatably connected inside the U-shaped fixing plate (41), a servo motor (43) for driving the rotating screw (42) to rotate is fixedly installed on the outer wall of the U-shaped fixing plate (41), a moving seat (44) is threadedly sleeved on the rod wall of the rotating screw (42), and a triangular detection block (45) is fixedly installed on one side of the upper end of the moving seat (44); The detection result feedback component (5) includes two symmetrically fixed electric push rods (51) installed on the upper end of the support plate (22). The upper moving ends of the two electric push rods (51) are fixedly connected to the same feedback shell (52). The upper inner wall of the feedback shell (52) is rotatably connected to a transmission screw (53). One end of the transmission screw (53) extends through the feedback shell (52) and is fixedly connected to a small diameter gear (54). One end of the rotating screw (42) is fixedly connected to a large diameter gear (55) that meshes with the small diameter gear (54). The rod wall of the transmission screw (53) is threaded with a feedback plate (56). The rear inner wall of the feedback shell (52) is fixedly fitted with an electric telescopic rod (57). The moving end of the electric telescopic rod (57) located inside the feedback shell (52) is fixedly connected to a feedback switch (58). The feedback switch (58) is arranged opposite to the feedback plate (56). The detection position confirmation component (6) includes a deflection motor (61) fixedly installed on the upper end of the movable seat (44), and a deflection rod (62) fixedly connected to the output end of the deflection motor (61). A pressure sensing plate (63) is embedded in the upper side wall of the deflection rod (62). The defective marking component (7) is fixedly installed on the upper end of the rotating support component (2); The PLC controller (8) is fixedly installed on the upper end of the base (1) and is electrically connected to the rotating support assembly (2), the rotation angle feedback assembly (3), the gap size detection assembly (4), the detection result feedback assembly (5), the detection position confirmation assembly (6), and the detection failure mark assembly (7) respectively, so as to realize the sequential detection of multiple points; When the pressure sensing plate touches the riveting position, the pressure sensing plate receives the pressure signal and feeds it back to the PLC controller. The PLC controller controls the deflection motor to drive the deflection rod to rotate 90 degrees, so that the deflection rod deflects to the lower position.

2. The device for detecting defects in self-piercing riveting joints of new energy vehicle bodies according to claim 1, characterized in that, The lower end of the support plate (22) is fixedly provided with a plurality of support rollers (24) that abut against the upper end of the base (1).

3. The device for detecting defects in self-piercing riveting joints of new energy vehicle bodies according to claim 1, characterized in that, The rotation angle feedback component (3) includes an encoder (31) fixedly installed on the upper end of the base (1), and the upper input end of the encoder (31) is connected to the support shaft (21) via a sprocket assembly (32).

4. The device for detecting defects in self-piercing riveting joints of new energy vehicle bodies according to claim 1, characterized in that, The defective marking assembly (7) includes an L-shaped vertical plate (71) fixedly installed on the upper end of the support plate (22). Multiple marking nozzles (72) are fixedly inserted at equal intervals on the upper end of the L-shaped vertical plate (71). The lower ends of the multiple marking nozzles (72) are fixedly connected to the same replenishment pipe (73). The lower end of the replenishment pipe (73) is fixedly connected to a feeding pipe (74). A feeding pump (75) is installed on the feeding pipe (74). The feeding pump (75) is fixedly installed on the side wall of the L-shaped vertical plate (71).

5. The device for detecting defects in self-piercing riveting joints of new energy vehicle bodies according to claim 1, characterized in that, The lower end of the movable seat (44) is fixedly connected to a limiting slider, and the upper end of the horizontal part of the U-shaped fixing plate (41) is provided with a limiting groove that matches and slides with the limiting slider.

Images