Cleaning device for pipeline maintenance

Abstract

The invention relates to the technical field of pipeline cleaning, and particularly discloses a cleaning device for pipeline overhaul, which comprises a cleaning cylinder, a driving assembly and a bending assembly, a cleaning piece is arranged on the side wall of the cleaning cylinder, the cleaning piece can abut against the inner wall of a pipeline, the cleaning cylinder has good deformation capacity, and the driving assembly is used for driving the cleaning cylinder to move in the pipeline. The two bending assemblies are symmetrically distributed on the two sides of the cleaning cylinder, each bending assembly comprises a pull rope, a first rotating plate, a second rotating plate and a driving mechanism, the first rotating plates are rotationally matched with the top end of the cleaning cylinder, the second rotating plates are rotationally matched with the bottom end of the cleaning cylinder, and the pull ropes wind the cleaning cylinder; the two ends of the pull rope are connected with the first rotating plate and the second rotating plate correspondingly, and the driving mechanism is used for pulling the pull rope. The cleaning device for pipeline maintenance can bend automatically so as to adapt to the bent part of a pipeline, and the cleaning effect on the bent part of the pipeline is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline cleaning, and in particular to a cleaning device for pipeline maintenance. Background Art

[0002] Pipe cleaning is an important measure to maintain the normal operation of the pipeline system, prevent blockage and ensure the smooth flow of fluids. Its main purpose is to remove various dirt, sediments and blockages in the pipeline to ensure the smooth flow of the pipeline system. Existing pipeline cleaning methods include: high-pressure water cleaning, mechanical cleaning and chemical cleaning. Among them, mechanical cleaning is to use tools such as pipeline dredging machines or dredging springs to physically remove blockages in the pipeline. This method is suitable for situations where the pipeline is severely blocked or the inner wall of the pipeline needs to be cleaned.

[0003] A Chinese patent with authorization announcement number CN107838140B discloses a pipe cleaner, which includes: a spiral cleaning member, wherein two ends of the spiral cleaning member are respectively connected to a first driving device for driving the spiral cleaning member to move and a second driving device for steering the spiral cleaning member; the first driving device includes a first mounting plate connected to the spiral cleaning member, and also includes a second mounting plate arranged in parallel with the first mounting plate, the first mounting plate and the second mounting plate are connected by a connecting member and an installation space is formed between the first mounting plate and the second mounting plate; a first driving component for driving the spiral cleaning member to move is arranged in the installation space; the second driving device includes a third mounting plate connected to the spiral cleaning member, the side of the third mounting plate facing away from the spiral cleaning member is an arc surface, and a second driving component is arranged on the arc surface of the third mounting plate.

[0004] The above patent drives the pipe cleaner as a whole to move forward through the first driving member, and uses the spiral cleaning member to scrape the inner wall of the pipe to clean the pipe. When cleaning the bent pipe part, the device as a whole squeezes the bent pipe, thereby realizing its own bending, so as to clean the bent pipe.

[0005] However, when cleaning a curved pipe, the above patent needs to squeeze the outer wall of the curved pipe, and the pressure applied to the inner side of the curved pipe will be less than the pressure applied to the outer side of the curved pipe, which can easily cause the spiral cleaning element to lose contact with the inner side of the curved pipe, resulting in impurities still attached to the inner side of the curved pipe, resulting in poor cleaning effect. Summary of the invention

[0006] The invention provides a cleaning device for pipeline maintenance, aiming to solve the problem of poor cleaning effect on the inner side of a curved pipe in the related art.

[0007] The cleaning device for pipeline maintenance of the present invention comprises: a cleaning cylinder, a driving assembly and a bending assembly; A cleaning piece is provided on the side wall of the cleaning cylinder, and the cleaning piece can abut against the inner wall of the pipeline, and the cleaning cylinder has good deformation ability; The driving assembly is used to drive the cleaning cylinder to move in the pipeline; The two bending components are symmetrically distributed on both sides of the cleaning cylinder. The bending components include a pull rope, a first rotating plate, a second rotating plate and a driving mechanism. The first rotating plate is rotatably engaged with the top end of the cleaning cylinder, and the second rotating plate is rotatably engaged with the bottom end of the cleaning cylinder. The pull rope is wrapped around the cleaning cylinder, and the two ends of the pull rope are respectively connected to the first rotating plate and the second rotating plate. The driving mechanism is used to pull the pull rope.

[0008] Put the cleaning cylinder into the pipeline, and the rear of the driving assembly pushes the cleaning cylinder to move in the pipeline. During the movement of the cleaning cylinder, the cleaning member cleans the inner wall of the pipeline. When encountering a curve, the first rotating plate is pulled by the pull rope, and the first rotating plate rotates and squeezes the cleaning cylinder, so that the cleaning cylinder is bent. At this time, the bent cleaning cylinder can be driven by the driving assembly to enter the curved part of the pipeline and clean the curved part of the pipeline. During the cleaning process, the cleaning cylinder applies uniform pressure to the curved part of the pipeline, thereby ensuring the cleaning effect of the curved part of the pipeline.

[0009] Preferably, the driving mechanism includes a first roller, a second roller and a first driving member, a mounting seat is provided at the bottom end of the cleaning cylinder, the first roller and the second roller are both rotatably cooperated with the mounting seat, the pull rope is located between the first roller and the second roller, the pull rope is frictionally cooperated with the first roller and the second roller, the first driving member is provided on the mounting seat, and the first driving member is used to drive the first roller to rotate.

[0010] Preferably, a first limit groove is provided at the top end of the cleaning cylinder, a second limit groove is provided at the bottom end of the cleaning cylinder, a first limit block is slidably fitted in the first rotating plate, the first limit block is connected to the pull rope, the first limit block is elastically connected to the first rotating plate, the first limit block can extend into the first limit groove, a second limit block is slidably fitted in the second rotating plate, the second limit block is connected to the pull rope, the second limit block is elastically connected to the second rotating plate, and the second limit block can extend into the second limit groove.

[0011] The first limit block extends into the first limit groove to limit the rotation of the first rotating plate, and the second limit block extends into the second limit groove to limit the rotation of the second rotating plate. When the cleaning cylinder is bent, the pull rope pulls the first limit block to make the first limit block disengage from the first limit groove, and the pull rope continues to pull the first limit block, thereby driving the first rotating plate to rotate. At this time, the second limit block is located in the second limit groove, thereby limiting the rotation of the second rotating plate and preventing the bottom end of the cleaning cylinder from bending.

[0012] Preferably, the cleaning cylinder is further provided with a plurality of reset cavities spaced apart along its circumference, the reset cavity extending along the axial direction of the cleaning cylinder, a reset spring being provided in the reset cavity, and two ends of the reset spring being respectively connected to the top and bottom ends of the cleaning cylinder.

[0013] When the cleaning cylinder is bent, the reset spring is stretched or compressed accordingly. When the cleaning cylinder needs to be restored, it is only necessary to reset the pull rope through the first driving member. The reset spring is reset to a natural state under the action of elastic force, thereby restoring the cleaning cylinder to a vertical state, preventing the cleaning cylinder from being unable to reset by its own elasticity.

[0014] Preferably, the driving assembly includes a driving seat and a traveling seat, the driving seat is connected to the mounting seat, a plurality of traveling seats are spaced apart on the circumference of the driving seat, the circumference of the traveling seat is rotatably engaged with a track, the track can frictionally engage with the inner wall of the pipe, a second driving member and a driving wheel are provided in the traveling seat, the second driving member is used to drive the driving wheel to rotate, and the driving wheel is engaged with the track.

[0015] Preferably, a rotating rod is provided between the traveling seat and the driving seat, and the two ends of the rotating rod are respectively rotatably connected to the traveling seat and the driving seat. A supporting spring is also provided between the driving seat and the traveling seat, and the two ends of the supporting spring are respectively rotatably connected to the driving seat and the traveling seat.

[0016] When cleaning pipes with different inner diameters, the distance between the running seat and the driving seat can be adjusted by rotating the rotating rod, and the supporting spring applies outward pressure to the driving seat so that the running seat always stops against the inner wall of the pipe.

[0017] Preferably, a rotating disk is provided between the driving seat and the mounting seat, a third driving member is provided in the driving seat, the third driving member is used to drive the rotating disk to rotate, and the rotating disk is rotationally connected to the mounting seat.

[0018] The third driving member drives the rotating disk to rotate, and the rotating disk can drive the cleaning cylinder to rotate, thereby adjusting the bending direction of the cleaning cylinder.

[0019] Preferably, a camera is further provided at the end of the cleaning cylinder, a data cable is provided on the driving seat, the camera is electrically connected to the data cable, and the data cable can be electrically connected to an external display.

[0020] By adopting the above technical solution, the beneficial effects of the present invention are: According to the cleaning device for pipeline maintenance of the present invention, the cleaning cylinder is placed in the pipeline, and the rear of the driving assembly pushes the cleaning cylinder to move in the pipeline. During the movement of the cleaning cylinder, the cleaning member cleans the inner wall of the pipeline. When encountering a curve, the first rotating plate is pulled by the pull rope, and the first rotating plate rotates and squeezes the cleaning cylinder, so that the cleaning cylinder is bent. At this time, the bent cleaning cylinder can be driven by the driving assembly to enter the curved part of the pipeline and clean the curved part of the pipeline. During the cleaning process, the cleaning cylinder applies uniform pressure to the curved part of the pipeline, thereby ensuring the cleaning effect of the curved part of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of a cleaning device for pipeline maintenance according to an embodiment of the present invention.

[0022] Figure 2 Schematic diagram of the cleaning cylinder structure of an embodiment of the present invention.

[0023] Figure 3 2 is a cross-sectional view of a cleaning cartridge according to an embodiment of the present invention.

[0024] Figure 4 2 is a schematic diagram of the structure of the first rotating plate according to an embodiment of the present invention.

[0025] Figure 5 Schematic diagram of the driving mechanism structure of an embodiment of the present invention.

[0026] Figure 6 Schematic diagram of the structure of the driving assembly of an embodiment of the present invention.

[0027] Figure 7 It is a cross-sectional view of a running seat according to an embodiment of the present invention.

[0028] Reference numerals: 1. Cleaning cylinder; 2. Cleaning member; 31. Pull rope; 32. First rotating plate; 33. Second rotating plate; 341. First roller; 342. Second roller; 343. First driving member; 4. Driving assembly; 41. Driving seat; 411. Rotating disk; 42. Traveling seat; 421. Track; 422. Driving wheel; 423. Road wheel; 43. Rotating rod; 5. First limit block; 6. Second limit block; 7. First elastic member; 8. Second elastic member; 9. Mounting seat; 10. Reset spring; 11. Support spring; 111. First spring; 112. Sliding seat; 113. Second spring; 12. Camera; 13. Data cable. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0030] like Figures 1 to 7 As shown, the cleaning device for pipeline maintenance of the present invention comprises: a cleaning cylinder 1, a driving assembly 4 and a bending assembly.

[0031] Specifically, Figure 1 and Figure 3 As shown, a cleaning member 2 is provided on the side wall of the cleaning cylinder 1, and the cleaning member 2 is a brush. A plurality of cleaning members 2 are densely distributed on the outer peripheral side of the cleaning cylinder 1. The cleaning cylinder 1 is made of flexible rubber and has good deformation ability. A plurality of reset cavities are also provided on the side wall of the cleaning cylinder 1. The plurality of reset cavities are evenly spaced along the circumference of the cleaning cylinder 1, and each reset cavity extends along the axial direction of the cleaning cylinder 1. A reset spring 10 is provided in the reset cavity, and the top end of the reset spring 10 is fixedly connected to the top end of the cleaning cylinder 1, and the bottom end of the reset spring 10 is fixedly connected to the bottom end of the cleaning cylinder 1.

[0032] like Figures 1 to 5As shown, two bending components are symmetrically distributed on both sides of the cleaning cylinder 1. The bending components include a pull rope 31, a first rotating plate 32, a second rotating plate 33 and a driving mechanism. The first rotating plate 32 and the second rotating plate 33 are both arc-shaped plates. The curvature of the two is the same as that of the cleaning cylinder 1. The first rotating plate 32 is rotatably matched at the top end of the cleaning cylinder 1, and the second rotating plate 33 is rotatably matched at the bottom end of the cleaning cylinder 1. The first rotating plate 32 and the second rotating plate 33 are symmetrically distributed up and down. A first sliding groove is provided on the first rotating plate 32. A first limiting block 5 is slidably matched in the first sliding groove. The first limiting block 5 is elastically connected to the first rotating plate 32 through a first elastic member 7. The first elastic member 7 is a spring. The first limiting block 5 can slide along the first sliding groove. The first limiting block 5 is an L-shaped block. One end of the first limiting block 5 can stop against the side wall of the first sliding groove, and the other end can extend out of the first rotating plate 32. The second rotating plate 33 is provided with a second sliding groove, and a second limit block 6 is slidably fitted in the second sliding groove. The second limit block 6 is elastically connected to the second rotating plate 33 through a second elastic member 8. The second elastic member 8 is a spring. The second limit block 6 can slide along the second sliding groove. The second limit block 6 is an L-shaped block, one end of which can stop against the side wall of the second sliding groove, and the other end of which can extend out of the second rotating plate 33. The top end of the cleaning cylinder 1 is provided with a first limit groove, and the first limit block 5 can extend into the first limit groove, so that the first limit block 5 can limit the rotation of the first rotating plate 32. The bottom end of the cleaning cylinder 1 is provided with a second limit groove, and the second limit block 6 can extend into the second limit groove, so that the second limit block 6 can limit the rotation of the second rotating plate 33. The bottom end of the cleaning cylinder 1 is fixedly connected to a mounting seat 9, and a driving mechanism is arranged on the mounting seat 9. The driving mechanism includes a first roller 341, a second roller 342 and a first driving member 343. The first roller 341 and the second roller 342 are spaced apart on the mounting seat 9. There is a gap between the first roller 341 and the second roller 342, and the width of the gap is smaller than the diameter of the pull rope 31. The first roller 341 and the second roller 342 are both rotatably matched with the mounting seat 9. The first driving member 343 is fixedly connected to the mounting seat 9. The first driving member 343 is The motor has its output end fixedly connected to the first roller 341, the first driving member 343 is used to drive the first roller 341 to rotate, one end of the pull rope 31 is fixedly connected to the first limit block 5, the pull rope 31 passes through the reset cavity and extends between the first roller 341 and the second roller 342, the pull rope 31 is frictionally engaged with the first roller 341 and the second roller 342, the other end of the pull rope 31 is fixedly connected to the second limit block 6, and the first driving member 343 can pull the first limit block 5 or the second limit block 6 by driving the first roller 341 to rotate.

[0033] The first driving member 343 in the right bending assembly rotates forward, the right first roller 341 rotates forward, and the right pull rope 31 pulls the right first limit block 5, so that the right first limit block 5 overcomes the elastic force of the first elastic member 7 and is received in the right first rotating plate 32. The right first limit block 5 slides in the first sliding groove and gradually approaches the outer end of the first sliding groove. When the right first limit block 5 and the outer end of the first sliding groove are stopped, under the action of the pull rope 31, the right first limit block 5 drives the right first rotating plate 32 to rotate downward, and the first rotating plate 32 squeezes the cleaning cylinder 1, so that the top end of the cleaning cylinder 1 bends to the right. At the same time, since the right second limit block 6 extends into the second limit groove, the right second rotating plate 33 remains stationary to prevent the bottom end of the cleaning cylinder 1 from bending to the right. At the same time, the first roller 341 on the left side reverses, and the pull rope 31 on the left side pulls the second limit block 6 on the left side, so that the second limit block 6 on the left side overcomes the elastic force of the second elastic member 8 and is collected in the second rotating plate 33 on the left side. The second limit block 6 on the left side slides in the second sliding groove and gradually approaches the outer end of the second limit groove. When the second limit block 6 on the left side abuts against the outer end of the second sliding groove, under the action of the pull rope 31, the second limit block 6 on the left side drives the second rotating plate 33 on the left side to rotate upward, releasing the limit on the left bottom end of the cleaning cylinder 1. When the top end of the cleaning cylinder 1 bends to the right, the left bottom end of the cleaning cylinder 1 can tilt upward. Similarly, the first driving member 343 in the right bending assembly reverses, and the first driving member 343 in the left bending assembly rotates forward, so that the top end of the cleaning cylinder 1 can be bent to the left.

[0034] like Figure 1 , Figure 6 and Figure 7As shown, the driving assembly 4 includes a driving seat 41 and a traveling seat 42. The end of the driving seat 41 is rotatably matched with a rotating disk 411. A third driving member is provided in the driving seat 41. The third driving member is a motor, and its output end is fixedly connected to the rotating disk 411. The third driving member is used to drive the rotating disk 411 to rotate. The rotating disk 411 is rotatably connected to the mounting seat 9. When the rotating disk 411 rotates, it will drive the mounting seat 9 to rotate synchronously with it. A plurality of running seats 42 are evenly spaced along the circumference of the driving seat 41, and a rotating rod 43 is provided between each running seat 42 and the driving seat 41, and both ends of the rotating rod 43 are rotatably connected to the running seat 42 and the driving seat 41 respectively. A supporting spring 11 is also provided between the driving seat 41 and the running seat 42, and the supporting spring 11 comprises a first spring 111 and a second spring 113. One end of the first spring 111 is fixedly connected to the driving seat 41, and the other end thereof is fixedly connected to a sliding seat 112, and the sliding seat 112 is slidably fitted on the driving seat 41, and the sliding seat 112 can move axially along the driving seat 41, and one end of the second spring 113 is rotatably connected to the running seat 42, and the other end thereof is rotatably connected to the sliding seat 112. The first spring 111 and the second spring 113 are always in a compressed state, so that the supporting spring 11 applies outward pressure to the running seat 42, so that the running seat 42 is always in contact with the inner wall of the pipeline. The peripheral side of the running seat 42 is rotatably matched with the crawler 421. The running seat 42 is provided with a driving wheel 422 and a second driving member. The driving wheel 422 is meshed with the crawler 421. The second driving member is a motor, which is used to drive the driving wheel 422 to rotate. The running seat 42 is also provided with a load-bearing wheel 423. A plurality of load-bearing wheels 423 are rotatably matched with the running seat 42. The load-bearing wheels 423 are meshed with the crawler 421, and the load-bearing wheels 423 are used to support the crawler 421.

[0035] like Figure 1 and Figure 2 As shown, a camera 12 is also provided at the top of the cleaning tube 1, and a data cable 13 is provided on the driving seat 41. The camera 12 is electrically connected to the data cable 13, and the data cable 13 can be electrically connected to an external display device. The camera 12 can transmit image data to the external display device through the data cable 13.

[0036] According to the cleaning device for pipeline maintenance of the embodiment of the present invention, the cleaning cylinder 1 is placed in the pipeline, and the rear driving component 4 pushes the cleaning cylinder 1 to move in the pipeline. During the movement of the cleaning cylinder 1, the cleaning member 2 cleans the inner wall of the pipeline. When encountering a bend, the second driving member drives the rotating disk 411 to rotate, so that the bending component is aligned with the bending direction of the pipeline, and the cleaning cylinder 1 is bent by the bending component. During the bending process, the bending degree of the pipeline is observed by the camera 12, so that the bending curvature of the cleaning cylinder 1 is consistent with the curvature of the curved part of the pipeline. While the bending component bends the cleaning cylinder 1, the driving component 4 pushes the cleaning cylinder 1 into the curved part of the pipeline and cleans the curved part of the pipeline. Since the cleaning cylinder 1 has the same curvature as the curved part of the pipeline, the curved part of the pipeline is evenly stressed when the cleaning cylinder 1 passes through the curved part of the pipeline, thereby preventing the generation of cleaning dead angles when cleaning the curved part of the pipeline.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0039] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A cleaning device for pipeline maintenance, comprising: A cleaning cylinder, wherein a cleaning piece is provided on the side wall of the cleaning cylinder, the cleaning piece can abut against the inner wall of the pipeline, and the cleaning cylinder has good deformation ability; A driving assembly, the driving assembly is used to drive the cleaning cylinder to move in the pipeline; It is characterized in that a bending component is also provided, and the two bending components are symmetrically distributed on both sides of the cleaning cylinder. The bending component includes a pull rope, a first rotating plate, a second rotating plate and a driving mechanism. The first rotating plate is rotatably engaged with the top end of the cleaning cylinder, and the second rotating plate is rotatably engaged with the bottom end of the cleaning cylinder. The pull rope is wrapped around the cleaning cylinder, and the two ends of the pull rope are respectively connected to the first rotating plate and the second rotating plate, and the driving mechanism is used to pull the pull rope.

2. The cleaning device for pipeline maintenance according to claim 1, characterized in that: The driving mechanism includes a first roller, a second roller and a first driving member. A mounting seat is provided at the bottom end of the cleaning cylinder. The first roller and the second roller are both rotatably engaged with the mounting seat. The pull rope is located between the first roller and the second roller. The pull rope is frictionally engaged with the first roller and the second roller. The first driving member is provided on the mounting seat. The first driving member is used to drive the first roller to rotate.

3. The pipeline maintenance cleaning device according to claim 2, characterized in that: A first limit groove is provided at the top end of the cleaning cylinder, and a second limit groove is provided at the bottom end of the cleaning cylinder. A first limit block is slidably fitted in the first rotating plate, the first limit block is connected to the pull rope, the first limit block is elastically connected to the first rotating plate, the first limit block can extend into the first limit groove, a second limit block is slidably fitted in the second rotating plate, the second limit block is connected to the pull rope, the second limit block is elastically connected to the second rotating plate, and the second limit block can extend into the second limit groove.

4. The cleaning device for pipeline maintenance according to claim 1, characterized in that: The cleaning cylinder is also provided with a plurality of reset cavities spaced apart along its circumference, the reset cavity extends along the axial direction of the cleaning cylinder, a reset spring is arranged in the reset cavity, and two ends of the reset spring are respectively connected to the top and bottom ends of the cleaning cylinder.

5. The cleaning device for pipeline maintenance according to claim 2, characterized in that: The driving assembly includes a driving seat and a traveling seat, the driving seat is connected to the mounting seat, a plurality of traveling seats are spaced apart on the circumference of the driving seat, the circumference of the traveling seat is rotatably engaged with a track, the track can frictionally engage with the inner wall of the pipeline, a second driving member and a driving wheel are provided in the traveling seat, the second driving member is used to drive the driving wheel to rotate, and the driving wheel is engaged with the track.

6. The cleaning device for pipeline maintenance according to claim 5, characterized in that: A rotating rod is provided between the traveling seat and the driving seat, and the two ends of the rotating rod are respectively rotatably connected to the traveling seat and the driving seat. A supporting spring is also provided between the driving seat and the traveling seat, and the two ends of the supporting spring are respectively rotatably connected to the driving seat and the traveling seat.

7. The cleaning device for pipeline maintenance according to claim 6, characterized in that: A rotating disk is provided between the driving seat and the mounting seat. A third driving member is provided in the driving seat. The third driving member is used to drive the rotating disk to rotate. The rotating disk is rotatably connected to the mounting seat.

8. The cleaning device for pipeline maintenance according to claim 7, characterized in that: A camera is also provided at the end of the cleaning cylinder, a data line is provided on the driving seat, the camera is electrically connected to the data line, and the data line can be electrically connected to an external display.

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