Special device for uniformly spraying surface of valve

Abstract

The invention relates to the technical field of valve machining equipment, in particular to a valve surface uniform spraying special device which comprises a bottom plate, a support is mounted at the top of the bottom plate, a guide rail is mounted on the support, a hanging disc moving in the length direction of the guide rail is mounted on the guide rail, and a slow swing assembly is mounted at the bottom of the hanging disc. An automatic spraying robot moving in the height direction of the support is installed on the support. The slow-speed swing assembly comprises a hook, a slow-speed assembly, a hanging ring, a valve and a transverse pushing assembly, the hook is connected with the hanging disc, the slow-speed assembly is installed at the end, away from the hanging disc, of the hook, the slow-speed assembly is sleeved with the hanging ring, the valve is fixedly connected with the hanging ring, and the transverse pushing assembly pushes the hook to swing. The technical problems that according to existing valve paint spraying equipment, the angle of a valve is difficult to adjust so that the paint spraying conditions of different positions of the valve can be checked conveniently, and the time when the valve swings to different angles is difficult to prolong so that the difficulty of checking the paint spraying conditions of the valve can be reduced are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of valve processing equipment, and specifically to a special device for uniformly spraying the surface of valves. Background Art

[0002] Valve painting is a key process in industrial manufacturing to improve the corrosion resistance, wear resistance, and sealing performance of valves. A dense protective layer is formed by spraying epoxy resin, polyurethane, or fluorocarbon coatings, which is suitable for harsh environments such as chemical industry, petroleum, and marine.

[0003] After retrieval, a Chinese invention patent with the application number CN201710648513.7 discloses a valve painting and drying integrated device, which achieves uniform painting of valves, and the painting and drying of valves are carried out alternately, with high painting and drying efficiency of valves.

[0004] After painting with the above device, in order to ensure the painting quality, it is necessary to check the uniformity of the painting to ensure that there are no missed painting positions on the valve. The inspection of the valve is generally carried out by workers wearing protective clothing to observe different positions of the valve. Even when using commonly used vision inspection equipment, the angle of the valve needs to be adjusted to better view different positions of the valve, and the worker still needs to swing the hook of the valve to make the valve shake before it is convenient to check the painting conditions of different positions of the valve. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a special device for uniformly spraying the surface of valves, which solves the technical problems that the existing valve painting equipment is difficult to adjust the angle of the valve to facilitate viewing the painting conditions of different positions of the valve, and it is also difficult to extend the time when the valve swings to different angles to reduce the difficulty of viewing the painting conditions of the valve.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: A special device for uniformly spraying the surface of valves, including a bottom plate. A bracket is installed on the top of the bottom plate. A guide rail is installed on the bracket. A suspension plate that moves along its length direction is installed on the guide rail. A slow-speed swing assembly is installed at the bottom of the suspension plate. An automatic spraying robot that moves along its height direction is installed on the bracket; The slow-speed swing assembly includes a hook, a slow-speed assembly, a hanging ring, a valve, and a horizontal pushing assembly. The hook is connected to the suspension plate. The slow-speed assembly is installed at the end of the hook away from the suspension plate. The hanging ring is sleeved outside the slow-speed assembly. The valve is fixedly connected to the hanging ring. The horizontal pushing assembly pushes the hook to swing.

[0007] Further, the slow-speed assembly includes a sleeve, an anti-slip tube, an elastic rod, and a roller. The sleeve is sleeved outside the hook. The anti-slip tube is sleeved outside the sleeve and is fixedly connected to the sleeve. The elastic rods are installed at both ends of the sleeve. The roller is rotatably connected to the elastic rod.

[0008] Further, the hook includes a straight rod portion, a bent portion and a multi-sided column. The bent portion is installed at both ends of the straight rod portion, and the multi-sided column is installed in the middle of the straight rod portion.

[0009] Further, the horizontal pushing assembly includes an outer frame, a push rod and a motor. The outer frame is fixed on the bottom plate through a support frame. The push rod is rotatably connected to the outer frame, and the motor is installed on the outer frame. The motor drives the push rod to rotate.

[0010] Further, the push rod includes an extension rod, a cross bar and an arc rod. The cross bar and the arc rod are of an integral structure. The extension rod is installed on the rotating shaft of the outer frame, and the cross bar is fixed to the extension rod.

[0011] Further, a drying assembly is installed on the top of the bottom plate. The drying assembly includes a jet frame and an air inlet pipe. The jet frame includes a horizontal plate and an arc frame. The horizontal plate is fixed on the bottom plate, and the arc frame is installed at both ends of the horizontal plate.

[0012] Further, a porous plate one is fixedly connected to the opening of the arc frame. A porous plate two is slidably connected to one side of the porous plate one. The air permeable holes on the porous plate one and the porous plate two are arranged in a staggered manner.

[0013] Further, a spring is fixedly connected to the top of the horizontal plate. The top of the spring is fixedly connected to a material receiving plate. An extension plate is fixedly connected to the bottom of the porous plate two.

[0014] Further, a side plate is fixedly connected to one side of the drying assembly. A cylinder is fixedly connected to one side of the side plate. The output end of the cylinder is slidably connected to a scraper.

[0015] Further, a limiting rod extending into the drying assembly is provided on one side of the side plate. A longitudinal groove is formed on one side of the scraper. The limiting rod penetrates through the longitudinal groove.

[0016] By means of the above technical solutions, the present invention provides a special device for uniformly spraying the surface of a valve, and at least has the following beneficial effects: 1. Through the slow-speed swinging assembly provided by the present invention, the valve can be kept at different angles for a longer time, which can facilitate the adjustment of the valve angle to conveniently check the painting conditions of different positions of the valve. At the same time, the time when the valve swings to different angles is extended to reduce the difficulty of checking the painting conditions of the valve.

[0017] 2. Through the slow-speed assembly provided by the present invention, it can not only push the valve to swing to different angles to conveniently check the painting conditions of different positions of the valve, but also extend the staying time of the valve at different angles to reduce the difficulty of checking the painting conditions. Moreover, it can reduce the possibility of wear caused by sliding between the valve and the hook during rotation, and ensure that the paint on the surface of the valve will not be scraped off when the valve swings.

[0018] 3. By providing the horizontal pushing component in the present invention, when the push rod rotates to the bracket and the hook and the valve move closer to the push rod, it can still guide the swinging of the hook and the valve, reducing the possibility that the push rod is blocked by the hook and cannot work properly.

[0019] 4. By providing the drying component in the present invention, it can utilize the air flow to accelerate the curing speed of the paint on the surface of the valve. At the same time, when the curing speed of the paint on the surface of the valve is slow, it increases the air flow rate sprayed onto the valve, and flexibly adjusts the drying intensity of the valve according to the actual situation of the paint spraying on the valve surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation to the present application. In the drawings: Figure 1 is a schematic structural diagram of the whole of the present invention; Figure 2 is a schematic structural diagram of the slow swing component of the present invention; Figure 3 is a schematic structural diagram of the hook, the slow component and the valve of the present invention; Figure 4 is a schematic structural diagram of the slow component of the present invention; Figure 5 is a schematic structural diagram of the horizontal pushing component of the present invention; Figure 6 is a schematic structural diagram of the drying component of the present invention; Figure 7 is a cross-sectional view of the drying component of the present invention.

[0021] In the figures: 1, bottom plate; 2, bracket; 3, guide rail; 4, suspension plate; 5, slow swing component; 51, hook; 511, straight rod part; 512, bent part; 513, multi-sided column; 52, slow component; 521, sleeve; 522, anti-slip tube; 523, elastic rod; 524, roller; 53, hanging ring; 54, valve; 55, horizontal pushing component; 551, outer frame; 552, push rod; 5521, extension rod; 5522, cross bar; 5523, arc rod; 553, motor; 6, drying component; 61, jet frame; 611, cross plate; 612, arc frame; 62, intake pipe; 7, automatic spraying robot; 8, perforated plate one; 9, perforated plate two; 10, spring; 11, receiving plate; 12, extension plate; 13, side plate; 14, cylinder; 15, scraper; 16, limiting rod; 17, longitudinal groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] Embodiment 1 In order to swing the valve to observe the painting conditions at different positions of the valve, and at the same time extend the residence time of the valve at each angle to facilitate more careful viewing of the painting conditions, please refer to Figures 1 - 4 , this embodiment proposes a special device for uniformly spraying the surface of the valve, including a bottom plate 1. A bracket 2 is installed on the top of the bottom plate 1. A guide rail 3 is installed on the bracket 2. A suspension plate 4 that moves along its length direction is installed on the guide rail 3. A slow-speed swing assembly 5 is installed at the bottom of the suspension plate 4. An automatic spraying robot 7 that moves along its height direction is installed on the bracket 2. The slow-speed swing assembly 5 includes a hook 51, a slow-speed assembly 52, a hanging ring 53, a valve 54, and a horizontal pushing assembly 55. The hook 51 is connected to the suspension plate 4. The slow-speed assembly 52 is installed at one end of the hook 51 away from the suspension plate 4. The hanging ring 53 is sleeved outside the slow-speed assembly 52. The valve 54 is fixedly connected to the hanging ring 53. The horizontal pushing assembly 55 pushes the hook 51 to swing.

[0024] During use, the suspension plate 4 moves along the guide rail 3, and a driving device is required to drive it during this process. The specific type of the driving device does not affect the effect of driving the suspension plate 4 to move along the guide rail 3. This embodiment lists one driving method, which is to use a roller to drive a chain to move. The chain is arranged along the track of the guide rail 3 and is on one side of the suspension plate 4. The chain is connected to the suspension plate 4. In this way, when the roller drives the chain to move, the suspension plate 4 connected to the chain can be driven to move synchronously. The hook 51 is hung below the suspension plate 4, and the valve that needs to be painted on the surface is hung on the hook 51 through the hanging ring 53. When the valve 54 moves to the bracket 2 along with the suspension plate 4, the automatic spraying robot 7 sprays the surface of the valve. The valve 54 is continuously sprayed by the automatic spraying robot 7 on it when passing through different brackets 2, completing the spraying process of the valve. During this process, when the valve 54 moves to the horizontal pushing assembly 55, please refer to Figure 2, the horizontal pushing component 55 pushes the hook 51 and the valve 54 to swing clockwise. The swinging speed depends on the moving speed of the horizontal pushing component 55. During the swinging process, the valve 54 rises a certain distance. When the valve 54 passes by the horizontal pushing component 55, the hook 51 is no longer pushed by the horizontal pushing component 55 and moves towards the starting point under its own gravity, that is, the valve 54 drives the hook 51 to rotate counterclockwise. The speed reducing component 52 slows down the rotating speed of the valve 54 and the hook 51 during this process, enabling the valve to stay at different angles for a longer time, facilitating the adjustment of the valve angle to conveniently check the painting conditions at different positions of the valve, and at the same time extending the time when the valve swings to different angles to reduce the difficulty of checking the painting conditions of the valve.

[0025] In order to slow down the speed when the valve swings from a higher position to the initial position, refer to Figure 4 , the speed reducing component 52 includes a sleeve 521, an anti-slip tube 522, an elastic rod 523 and a roller 524. The sleeve 521 is sleeved outside the hook 51, the anti-slip tube 522 is sleeved outside the sleeve 521, the anti-slip tube 522 is fixedly connected to the sleeve 521, the elastic rods 523 are installed at both ends of the sleeve 521, and the roller 524 is rotatably connected to the elastic rod 523.

[0026] During use, after the valve 54 is pushed to a higher position by the horizontal pushing component 55 and then moves towards the initial position under its own gravity, it drives the anti-slip tube 522 and the sleeve 521 to rotate synchronously. The anti-slip tube 522 reduces the possibility of the valve 54 and the hanging ring 53 slipping relative to the sleeve 521. During the process of the sleeve 521 being driven to rotate, the elastic rod 523 pushes the roller 524 to press against the hook 51, increasing the friction force between them. Originally, the hook 51 could be driven by the valve 54 to quickly move from a higher position to the starting point. However, because the elastic rod 523 presses the roller 524 against the hook 51, the damping design of the roller 524 hinders the rotation of the anti-slip tube 522 and the sleeve 521, slowing down the rotation speed of the sleeve 521 and the anti-slip tube 522 along the hook 521, thereby slowing down the rotation speed of the sleeve 521 driven by the valve 54, enabling the valve 54 to stay at different angles for a longer time to conveniently check the painting conditions on its surface. During the process of the roller 524 being pressed against the hook 51 and moving along the surface of the hook 51, it will also scrape off the paint at the connection between the sleeve 521 and the hook 51. This not only can push the valve 54 to swing to different angles to conveniently check the painting conditions at different positions of the valve, but also extends the staying time of the valve 54 at different angles to reduce the difficulty of checking the painting conditions, and can also reduce the possibility of wear caused by sliding between the valve and the hook 51 during rotation, ensuring that the valve 54 does not scrape off the paint on its surface when swinging.

[0027] In order to facilitate the horizontal pushing component 55 to push the hook 51 and the valve 54 to swing and reduce the deviation angle of the valve 54 to both sides when being pushed, refer to Figure 3, the hook 51 includes a straight rod portion 511, a bent portion 512 and a multi-sided column 513. The bent portion 512 is installed at both ends of the straight rod portion 511, and the multi-sided column 513 is installed in the middle of the straight rod portion 511.

[0028] When in use, the bent portions 512 at both ends of the hook 51 facilitate connection with the suspension plate 4 and the valve 54. The multi-sided column 513 makes the sides of the hook 51 all flat surfaces, facilitating the transverse pushing assembly 55 to push the hook 51 and the valve 54 to move in a direction perpendicular to the surface of the hook 51, thereby reducing the possibility of the valve 54 shifting to both sides when being pushed.

[0029] Embodiment Two In order to achieve the purpose of pushing the valve 54 to rotate and changing the angle of the valve 54 to facilitate viewing the painting conditions at different positions, referring to Figures 1 - 5 , on the basis of Embodiment One, the transverse pushing assembly 55 includes an outer frame 551, a push rod 552 and a motor 553. The outer frame 551 is fixed on the bottom plate 1 through a support frame. The push rod 552 is rotatably connected to the outer frame 551. The motor 553 is installed on the outer frame 551, and the motor 553 drives the push rod 552 to rotate. The push rod 552 includes an extension rod 5521, a cross bar 5522 and an arc rod 5523. The cross bar 5522 and the arc rod 5523 are of an integrated structure. The extension rod 5521 is installed on the rotating shaft of the outer frame 551, and the cross bar 5522 is fixed to the extension rod 5521.

[0030] When in use, adjust the rotation speed of the motor 553 so that the frequency of the motor 553 driving the push rod 552 to rotate close to the bracket 2 is consistent with the frequency of the valve 54 moving past the bracket 2. The motor 553 drives the push rod 552 to rotate. When the hook 51 moves to the transverse pushing assembly 55, the push rod 552 pushes the hook 51 to move, causing the hook 51 and the valve 54 at its bottom to rotate along the suspension plate 4, completing the effect of pushing the valve 54 to swing. There is a special state in this process, that is, when the rotation speed of the motor 553 driving the push rod 552 is too fast or too slow, after the cross bar 5522 rotates to the position of the hook 51, the hook 51 and the valve 54 are only then pulled by the chain and move along the guide rail 3 to the position of the push rod 552. At this time, the arc rod 5523 plays a role in limiting the hook 51. The arc rod 5523 extends to the position of the hook 51, and the moving hook 51 moves along the arc rod 5523 to the cross bar 5522, achieving the effect of swinging after being limited by the push rod 552. When the push rod 552 rotates to the position of the bracket 2 and the hook 51 and the valve 54 only then move close to the push rod 552, it can still play the role of guiding the swinging of the hook 51 and the valve 54, reducing the possibility of the push rod 552 being blocked by the hook 51 and unable to work properly.

[0031] Embodiment Three In order to accelerate the curing speed after the valve is painted, and further accelerate the curing speed when the paint on the valve 54 drips, so that the paint sprayed on the valve 54 can be better cured on the valve 54, referring to Figures 1 - 7 , on the basis of the first embodiment, a drying component 6 is installed on the top of the bottom plate 1. The drying component 6 includes a jet frame 61 and an air inlet pipe 62. The jet frame 61 includes a horizontal plate 611 and an arc frame 612. The horizontal plate 611 is fixed on the bottom plate 1, and the arc frame 612 is installed at both ends of the horizontal plate 611. A porous plate 8 is fixedly connected to the opening of the arc frame 612. A porous plate 9 is slidably connected to one side of the porous plate 8. The air permeable holes on the porous plate 8 and the porous plate 9 are arranged staggeredly. A spring 10 is fixedly connected to the top of the horizontal plate 611, and a receiving plate 11 is fixedly connected to the top of the spring 10. An extension plate 12 is fixedly connected to the bottom of the porous plate 9. A side plate 13 is fixedly connected to one side of the drying component 6. A cylinder 14 is fixedly connected to one side of the side plate 13. A scraping plate 15 is slidably connected to the output end of the cylinder 14. A limiting rod 16 extending into the drying component 6 is provided on one side of the side plate 13. A longitudinal groove 17 is opened on one side of the scraping plate 15, and the limiting rod 16 penetrates through the longitudinal groove 17.

[0032] During use, a spring 10 with a small elastic coefficient is selected, so that the increased weight after the paint drips on the receiving plate 11 can significantly push the receiving plate 11 downward to compress and contract the spring 10. The air inlet pipe 62 is externally connected to an air pipeline to continuously supply air into the arc frame 612, and then jet air upward to the valve 54 through the air permeable holes on the porous plate 8 and the porous plate 9. The spring 10 supports the receiving plate 11, and then supports the height of the porous plate 9 through the extension plate 12. At this time, the air permeable holes on the porous plate 8 and the porous plate 9 are staggered, and only a small part overlaps. Therefore, the air passage sprayed from the inside of the arc frame 612 to the valve 54 is the smallest. Some paint will fall on the receiving plate 11. The cylinder 14 drives the scraping plate 15 to move back and forth. The scraping plate 15 is a light plate. Even after the receiving plate 11 descends, the scraping plate 15 can slide down along the limiting rod 16 and still contact the upper surface of the receiving plate 11. Since the mass of the scraping plate 15 is light, the thrust on the receiving plate 11 during the process of scraping the paint on the receiving plate 11 after being pushed by the cylinder 14 is small, and the lifting amplitude of the receiving plate 11 caused does not affect the overall movement condition of the receiving plate 11.

[0033] Since the squeegee 15 continuously scrapes away the paint that has fallen onto the material receiving plate 11, the amount of paint on the material receiving plate 11 is always relatively small. When the paint on the valve 54 fails to cure in time and drips, the amount of paint falling onto the material receiving plate 11 increases. The weight of the paint on the material receiving plate 11 causes the material receiving plate 11 to descend and compress the spring 10. After the bottom of the second porous plate 9 loses the support of the material receiving plate 11, it also descends, increasing the overlapping part of the ventilation holes on the second porous plate 9 and the first porous plate 8. The air inside the arc-shaped frame 612 can be sprayed onto the valve 54 through a channel with a larger cross-section, enabling the use of air flow to accelerate the curing speed of the paint on the surface of the valve 54. At the same time, when the curing speed of the paint on the surface of the valve 54 is slow, the air flow sprayed onto the valve 54 is increased, and the drying intensity of the valve 54 can be flexibly adjusted according to the actual situation of the paint spraying on the surface of the valve 54.

[0034] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0035] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Special device for uniformly spraying the surface of a valve, comprising a bottom plate (1), characterized in that, A bracket (2) is installed on the top of the bottom plate (1). A guide rail (3) is installed on the bracket (2). A suspension plate (4) that moves along its length direction is installed on the guide rail (3). A speed-reducing swing assembly (5) is installed at the bottom of the suspension plate (4). An automatic spraying robot (7) that moves along the height direction of the bracket (2) is installed on the bracket (2). The speed-reducing swing assembly (5) includes a hook (51), a speed-reducing assembly (52), a hanging ring (53), a valve (54), and a lateral pushing assembly (55). The hook (51) is connected to the suspension plate (4). The speed-reducing assembly (52) is installed at one end of the hook (51) away from the suspension plate (4). The hanging ring (53) is sleeved outside the speed-reducing assembly (52). The valve (54) is fixedly connected to the hanging ring (53). The lateral pushing assembly (55) pushes the hook (51) to swing.

2. The special device for uniformly spraying the surface of a valve according to claim 1, characterized in that, The speed-reducing assembly (52) includes a sleeve (521), an anti-slip tube (522), an elastic rod (523), and a roller (524). The sleeve (521) is sleeved outside the hook (51). The anti-slip tube (522) is sleeved outside the sleeve (521). The anti-slip tube (522) is fixedly connected to the sleeve (521). The elastic rods (523) are installed at both ends of the sleeve (521). The roller (524) is rotatably connected to the elastic rod (523).

3. The special device for uniformly spraying the surface of the valve according to claim 1, wherein The hook (51) includes a straight rod portion (511), a bent portion (512), and a multi-sided column (513). The bent portion (512) is installed at both ends of the straight rod portion (511). The multi-sided column (513) is installed in the middle of the straight rod portion (511).

4. The special device for uniformly spraying the surface of a valve according to claim 1, characterized in that, The lateral pushing assembly (55) includes an outer frame (551), a push rod (552), and a motor (553). The outer frame (551) is fixed to the bottom plate (1) through a support frame. The push rod (552) is rotatably connected to the outer frame (551). The motor (553) is installed on the outer frame (551). The motor (553) drives the push rod (552) to rotate.

5. The special device for uniformly spraying the valve surface according to claim 4, characterized in that, The push rod (552) includes an extension rod (5521), a cross bar (5522), and an arc rod (5523). The cross bar (5522) and the arc rod (5523) are an integrated structure. The extension rod (5521) is installed on the rotating shaft of the outer frame (551). The cross bar (5522) is fixed to the extension rod (5521).

6. The special device for uniformly spraying the surface of a valve according to claim 1, characterized in that, A drying assembly (6) is installed on the top of the bottom plate (1). The drying assembly (6) includes a jet frame (61) and an air inlet pipe (62). The jet frame (61) includes a cross plate (611) and an arc frame (612). The cross plate (611) is fixed to the bottom plate (1). The arc frame (612) is installed at both ends of the cross plate (611).

7. The special device for uniformly spraying the valve surface according to claim 6, characterized in that, A porous plate one (8) is fixedly connected to the opening of the arc frame (612). A porous plate two (9) is slidably connected to one side of the porous plate one (8). The air-permeable holes on the porous plate one (8) and the porous plate two (9) are arranged in a staggered manner.

8. The special device for uniformly spraying the surface of a valve according to claim 7, characterized in that, A spring (10) is fixedly connected to the top of the cross plate (611). The top of the spring (10) is fixedly connected to a material receiving plate (11). An extension plate (12) is fixedly connected to the bottom of the porous plate two (9).

9. The special device for uniformly spraying the surface of a valve according to claim 1, characterized in that, One side of the drying component (6) is fixedly connected with a side plate (13), one side of the side plate (13) is fixedly connected with a cylinder (14), and the output end of the cylinder (14) is slidably connected with a scraper (15).

10. The special device for uniformly spraying the surface of a valve according to claim 9, characterized in that, A limiting rod (16) extending into the drying component (6) is arranged on one side of the side plate (13), a longitudinal groove (17) is formed on one side of the scraper (15), and the limiting rod (16) penetrates through the longitudinal groove (17).

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