Automatic obstacle clearing device for grass and stone isolation belt

Abstract

The present invention provides an automatic obstacle clearing device for a grass-stone isolation belt, which relates to the technical field of greening engineering, and comprises a central warehouse and a crawler part, wherein both ends of both sides of the central warehouse are provided with sleeves, and four groups of the sleeves are movably installed with plug rods inside, and both ends of the four groups of plug rods are rotatably provided with rotating arms, and the crawler part is provided with two groups, and the two groups of the crawler parts are respectively arranged below the rotating arms on both sides, and both ends of the plug rod are provided with a first fixing hole and a second fixing hole, and the rotating arm is provided with a fixing block; the present invention rotates the rotating arm so that the crawler part is folded inward, and is fixed with the second fixing hole in conjunction with a pin shaft, so that it can be stuck on the grass-stone isolation belt, thereby performing track-seeking movement, and cooperating with the cutting blade rotating under the driving cylinder to realize automatic track-seeking and obstacle clearing, which has high efficiency and fast speed, and the rotating arm can also be reset, and is fixed with the first fixing hole in conjunction with the pin shaft, so that the crawler part is supported downward, and can be operated on the green belt or on the road surface, and has a wide range of applications.

Description

Technical Field

[0001] The invention relates to the technical field of greening engineering, and in particular to an automatic obstacle clearing device for a grass-stone isolation belt. Background Art

[0002] In greening projects, grass and stone isolation belts are widely used. The main function of grass and stone isolation belts is to separate lawns from trees or paving to achieve a refreshing and pleasant effect. Even if grass and stone isolation belts are installed, they can only ensure that the roots of the grass will not cross the isolation belts. However, as the growth rate increases, it also needs to be trimmed regularly to achieve the effect of "isolation belt";

[0003] Traditional grass and stone isolation belts are mainly made of PVC and stainless steel, but they have one thing in common, that is, the upper part is designed to be convex, in order to avoid scratching pedestrians. If the grass and stone isolation belt is not cleaned regularly, the growth of the tenacious grass will be out of control, affecting the image of the park;

[0004] There are mainly the following ways to clean the traditional grass-stone isolation belt: manual cleaning with a shovel, a flat shovel, a weeding pliers, a cutting knife, a weeder, etc. However, there are the following disadvantages:

[0005] 1. Manual cleaning is inefficient and takes a long time;

[0006] 2. The weeds on both sides of the grass-stone isolation zone require workers to stand up to clean them, which is very difficult and harmful to the waist;

[0007] 3. For parks and other places with many color bands, cleaning requires a lot of manpower and is costly;

[0008] 4. Due to the different vegetation on both sides of the grass and stone isolation belt, it is sometimes necessary to frequently change the cleaning tools;

[0009] 5. The inability to clean automatically affects the image of the garden area, which is a difficult problem to solve in the greening industry;

[0010] Therefore, the present invention proposes an automatic obstacle clearing device for a grass-stone isolation belt to solve the problems existing in the prior art. Summary of the invention

[0011] In view of the above problems, the present invention proposes an automatic obstacle clearing device for grass and stone isolation belts. The automatic obstacle clearing device for grass and stone isolation belts has a wide range of applications, saves a lot of labor costs, and reduces costs.

[0012] To achieve the purpose of the present invention, the present invention is implemented through the following technical solutions: an automatic obstacle clearing device for grass and stone isolation belt, including a middle warehouse and a crawler part, sleeves are provided at both ends of both sides of the middle warehouse, and four groups of inserting rods are movably installed inside the sleeves, and rotating arms are rotatably provided at both ends of the four groups of inserting rods, and the crawler part is provided with two groups, and the two groups of crawler parts are respectively arranged under the rotating arms on both sides,

[0013] A first fixing hole and a second fixing hole are provided at both ends of the insertion rod, a fixing block is provided on the rotating arm, the first fixing hole and the second fixing hole are located on the moving path of the fixing block, and a pin shaft is installed inside the fixing block, the pin shaft is adapted to the first fixing hole and the second fixing hole, a driving bin is provided at the middle position on the middle bin, and driving cylinders are provided on both sides of the driving bin, and a cutting blade is rotatably provided below the driving cylinder.

[0014] A further improvement is that the track part includes a mobile warehouse and track wheels, the track wheels are provided in multiple groups, and the multiple groups of track wheels are rotatably arranged inside the mobile warehouse, the lower ends of the track wheels extend out of the mobile warehouse, and the outer sides of the multiple groups of track wheels are wrapped with tracks.

[0015] A further improvement is that a motor is provided at one end of the inner side of the mobile bin, and the output end of the motor is connected to a group of track wheels, and side rollers are rotatably provided on the outer side of the mobile bin, and multiple groups of side rollers are equidistantly provided.

[0016] A further improvement is that a fixing bolt is provided on the sleeve, and the lower end of the fixing bolt extends into the interior of the sleeve, and the fixing bolt is used to fix the insertion rod.

[0017] A further improvement is that an inner cavity is provided inside the middle warehouse and the driving warehouse, and a motor is provided at one end of the inner cavity, a worm is provided at the output end of the motor, a rotating shaft is provided in the middle of the inner cavity, and a worm wheel matched with the worm is provided at the middle position of the rotating shaft.

[0018] A further improvement is that the rotating shaft is located inside the driving bin, and both sides of the rotating shaft extend to the inside of the driving cylinder on both sides respectively, a turntable is provided inside the driving cylinder for rotation through a bearing ring, and a first bevel gear is provided above the turntable, and second bevel gears are provided on both sides of the rotating shaft, and the second bevel gear is adapted to the first bevel gear.

[0019] A further improvement is that a battery pack is provided at one end of the inner cavity, and the battery pack is used to supply power to the motor.

[0020] A further improvement is that a polygonal rod extending from the driving cylinder is provided below the turntable, and a screw head is provided below the polygonal rod, and a nut ring is threadedly installed on the screw head.

[0021] A further improvement is that the cutting blade is a circular cutting disc, and a first polygonal hole matching the polygonal rod is provided inside the circular cutting disc, and the circular cutting disc is installed with the polygonal rod through the first polygonal hole and fixed with a nut ring.

[0022] A further improvement is that the cutting blade includes a mounting plate and a saw-shaped cutting knife, the saw-shaped cutting knife is connected to one side of the mounting plate, and the mounting plate is provided with a second polygonal hole adapted to the polygonal rod, the mounting plate is mounted on the polygonal rod through the second polygonal hole and fixed with a nut ring.

[0023] The beneficial effects of the present invention are:

[0024] 1. The present invention rotates the rotating arm so that the track portion is folded inward, and is fixed with the pin shaft and the second fixing hole so that it can be stuck on the grass and stone isolation belt, thereby performing track-seeking movement, and cooperating with the rotating cutting blade under the driving cylinder to realize automatic track-seeking and obstacle clearing, which is efficient and fast. The rotating arm can also be reset, and is fixed with the pin shaft and the first fixing hole so that the track portion is supported downward, so that it can be operated on the green belt or on the road surface. It has a wide range of applications, saves a lot of labor costs, and reduces costs.

[0025] 2. The present invention installs the cutting blade through a polygonal rod, and fixes the cutting blade by matching the nut ring with the screw head. The cutting blade can be a circular cutting disc for weeding, or a saw-shaped cutting blade for cutting seedlings, which is convenient for changing to suit different environments.

[0026] 3. The present invention can adjust the distance that the rod in the casing extends by fixing it with fixing bolts, thereby changing the spacing between the crawler parts on both sides, and is suitable for grass-stone isolation belts of different widths. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a front view of the present invention;

[0028] Figure 2 It is a schematic diagram of the installation of the rotating arm of the present invention;

[0029] Figure 3 It is a schematic diagram of the interior of the inner cavity of the present invention;

[0030] Figure 4 A schematic diagram of a polygonal rod according to the present invention;

[0031] Figure 5 is a schematic diagram of a circular cutting disc of the present invention;

[0032] Figure 6 It is a schematic diagram of a saw-shaped cutting knife of the present invention.

[0033] Among them: 1. middle warehouse; 2. sleeve; 3. plug rod; 4. rotating arm; 5. first fixing hole; 6. second fixing hole; 7. fixing block; 8. pin shaft; 9. driving warehouse; 10. driving cylinder; 11. mobile warehouse; 12. track wheel; 13. track; 14. motor; 15. side roller; 16. fixing bolt; 17. inner cavity; 18. motor; 19. worm; 20. rotating shaft; 21. worm wheel; 22. bearing ring; 23. turntable; 24. first bevel gear; 25. second bevel gear; 26. battery pack; 27. polygonal rod; 28. screw head; 29. ​​nut ring; 30. circular cutting disk; 31. first polygonal hole; 32. mounting disk; 33. saw-shaped cutting knife; 34. second polygonal hole. DETAILED DESCRIPTION

[0034] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with examples. The examples are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention. Embodiment 1

[0035] according to Figure 1 , 2 , 3, 4, 5, and 6, this embodiment proposes an automatic obstacle clearing device for a grass-stone isolation belt, comprising a middle warehouse 1 and a crawler part, sleeves 2 are provided at both ends of both sides of the middle warehouse 1, and four groups of inserting rods 3 are movably installed inside the sleeves 2, and rotating arms 4 are rotatably provided at both ends of the four groups of inserting rods 3, and two groups of crawler parts are provided, and the two groups of crawler parts are respectively arranged below the rotating arms 4 on both sides,

[0036] Both ends of the plug rod 3 are provided with a first fixing hole 5 and a second fixing hole 6, and the rotating arm 4 is provided with a fixing block 7, and the first fixing hole 5 and the second fixing hole 6 are located on the moving path of the fixing block 7, and a pin shaft 8 is installed inside the fixing block 7, and the pin shaft 8 is adapted to the first fixing hole 5 and the second fixing hole 6, and a driving bin 9 is provided at the middle position on the middle bin 1, and a driving cylinder 10 is provided on both sides of the driving bin 9, and a cutting blade is provided for rotation below the driving cylinder 10. When in use, the rotating arm 4 is rotated so that the track part is folded inward, and the pin shaft 8 is fixed with the second fixing hole 6, so that it can be stuck on the grass and stone isolation belt, thereby performing track-seeking movement, and the cutting blade rotating under the driving cylinder 10 is cooperated to realize automatic track-seeking and obstacle removal, which is efficient and fast, and the rotating arm 4 can also be reset, and the pin shaft 8 is fixed with the first fixing hole 5, so that the track part is supported downward, and it can be operated on the green belt or on the road surface.

[0037] The track section includes a mobile warehouse 11 and track wheels 12. The track wheels 12 are provided in multiple groups, and the multiple groups of track wheels 12 are rotatably arranged inside the mobile warehouse 11. The lower ends of the track wheels 12 extend out of the mobile warehouse 11, and tracks 13 are wound around the outer sides of the multiple groups of track wheels 12. A motor 14 is provided at one end of the inner side of the mobile warehouse 11, and the output end of the motor 14 is connected to a group of track wheels 12. The outer side of the mobile warehouse 11 is rotatably provided with side rollers 15, and multiple groups of side rollers 15 are equidistantly arranged. When in use, the motor 14 drives the track wheels 12 to rotate, drives the track 13 to run, and the track section is folded inward, and the track 13 can be stuck on the grass and stone isolation belt, thereby performing track-seeking movement. In this process, the side rollers 15 can be rolled and supported at the bottom to avoid wear. The track section can also be rotated and reset, supported downward, and operated on the green belt or road surface.

[0038] The casing 2 is provided with a fixing bolt 16, and the lower end of the fixing bolt 16 extends into the interior of the casing 2, and the fixing bolt 16 is used to fix the insertion rod 3. When in use, the distance of the insertion rod 3 in the casing 2 can be adjusted by fixing the fixing bolt 16, thereby changing the spacing between the crawler parts on both sides, which is suitable for grass and stone isolation belts of different widths.

[0039] The middle chamber 1 and the driving chamber 9 are provided with an inner cavity 17, and a motor 18 is provided at one end of the inner cavity 17, and a worm 19 is provided at the output end of the motor 18. A rotating shaft 20 is rotatably provided in the middle of the inner cavity 17, and a worm wheel 21 matched with the worm 19 is provided at the middle position of the rotating shaft 20. The rotating shaft 20 is located inside the driving chamber 9, and both sides of the rotating shaft 20 extend to the inside of the driving cylinder 10 on both sides respectively. A rotating disk 23 is rotatably provided inside the driving cylinder 10 through a bearing ring 22, and a first bevel gear 24 is provided above the rotating disk 23. Second bevel gears 25 are provided on both sides of the rotating shaft 20, and the second bevel gear 25 is matched with the first bevel gear 24. A battery pack 26 is provided at one end of the inner cavity 17, and the battery pack 26 is used to supply power to the motor 18 and the motor 14. When in use, the battery pack 26 supplies power, the motor 18 drives the worm 19 to rotate, so that the worm wheel 21 rotates, the drive shaft 20 rotates, and the second bevel gear 25 is adapted to the first bevel gear 24 to drive the turntable 23 to rotate, so that the cutting blade rotates.

[0040] A polygonal rod 27 extending from the driving cylinder 10 is provided below the rotating disk 23, and a screw head 28 is provided below the polygonal rod 27, and a nut ring 29 is threadedly installed on the screw head 28. The cutting blade is a circular cutting disc 30, and a first polygonal hole 31 adapted to the polygonal rod 27 is provided inside the circular cutting disc 30. The circular cutting disc 30 is installed with the polygonal rod 27 through the first polygonal hole 31 and fixed with the nut ring 29. When in use, the cutting blade is installed through the polygonal rod 27, and the cutting blade is fixed by the adaptation of the nut ring 29 and the screw head 28. The cutting blade can be a circular cutting disc 30, which is convenient for weeding. Embodiment 2

[0041] according to Figure 1 , 2 , 3, 4, 5, and 6, this embodiment proposes an automatic obstacle clearing device for a grass-stone isolation belt, comprising a middle warehouse 1 and a crawler part, sleeves 2 are provided at both ends of both sides of the middle warehouse 1, and four groups of inserting rods 3 are movably installed inside the sleeves 2, and rotating arms 4 are rotatably provided at both ends of the four groups of inserting rods 3, and two groups of crawler parts are provided, and the two groups of crawler parts are respectively arranged below the rotating arms 4 on both sides,

[0042] Both ends of the plug rod 3 are provided with a first fixing hole 5 and a second fixing hole 6, and the rotating arm 4 is provided with a fixing block 7, and the first fixing hole 5 and the second fixing hole 6 are located on the moving path of the fixing block 7, and a pin shaft 8 is installed inside the fixing block 7, and the pin shaft 8 is adapted to the first fixing hole 5 and the second fixing hole 6, and a driving bin 9 is provided at the middle position on the middle bin 1, and a driving cylinder 10 is provided on both sides of the driving bin 9, and a cutting blade is provided for rotation below the driving cylinder 10. When in use, the rotating arm 4 is rotated so that the track part is folded inward, and the pin shaft 8 is fixed with the second fixing hole 6, so that it can be stuck on the grass and stone isolation belt, thereby performing track-seeking movement, and the cutting blade rotating under the driving cylinder 10 is cooperated to realize automatic track-seeking and obstacle removal, which is efficient and fast, and the rotating arm 4 can also be reset, and the pin shaft 8 is fixed with the first fixing hole 5, so that the track part is supported downward, and it can be operated on the green belt or on the road surface.

[0043] The track section includes a mobile warehouse 11 and track wheels 12. The track wheels 12 are provided in multiple groups, and the multiple groups of track wheels 12 are rotatably arranged inside the mobile warehouse 11. The lower ends of the track wheels 12 extend out of the mobile warehouse 11, and tracks 13 are wound around the outer sides of the multiple groups of track wheels 12. A motor 14 is provided at one end of the inner side of the mobile warehouse 11, and the output end of the motor 14 is connected to a group of track wheels 12. The outer side of the mobile warehouse 11 is rotatably provided with side rollers 15, and multiple groups of side rollers 15 are equidistantly arranged. When in use, the motor 14 drives the track wheels 12 to rotate, drives the track 13 to run, and the track section is folded inward, and the track 13 can be stuck on the grass and stone isolation belt, thereby performing track-seeking movement. In this process, the side rollers 15 can be rolled and supported at the bottom to avoid wear. The track section can also be rotated and reset, supported downward, and operated on the green belt or road surface.

[0044] The casing 2 is provided with a fixing bolt 16, and the lower end of the fixing bolt 16 extends into the interior of the casing 2, and the fixing bolt 16 is used to fix the insertion rod 3. When in use, the distance of the insertion rod 3 in the casing 2 can be adjusted by fixing the fixing bolt 16, thereby changing the spacing between the crawler parts on both sides, which is suitable for grass and stone isolation belts of different widths.

[0045] The middle chamber 1 and the driving chamber 9 are provided with an inner cavity 17, and a motor 18 is provided at one end of the inner cavity 17, and a worm 19 is provided at the output end of the motor 18. A rotating shaft 20 is rotatably provided in the middle of the inner cavity 17, and a worm wheel 21 matched with the worm 19 is provided at the middle position of the rotating shaft 20. The rotating shaft 20 is located inside the driving chamber 9, and both sides of the rotating shaft 20 extend to the inside of the driving cylinder 10 on both sides respectively. A rotating disk 23 is rotatably provided inside the driving cylinder 10 through a bearing ring 22, and a first bevel gear 24 is provided above the rotating disk 23. Second bevel gears 25 are provided on both sides of the rotating shaft 20, and the second bevel gear 25 is matched with the first bevel gear 24. A battery pack 26 is provided at one end of the inner cavity 17, and the battery pack 26 is used to supply power to the motor 18 and the motor 14. When in use, the battery pack 26 supplies power, the motor 18 drives the worm 19 to rotate, so that the worm wheel 21 rotates, the drive shaft 20 rotates, and the second bevel gear 25 is adapted to the first bevel gear 24 to drive the turntable 23 to rotate, so that the cutting blade rotates.

[0046] A polygonal rod 27 extending from the driving cylinder 10 is provided below the rotating disk 23, and a screw head 28 is provided below the polygonal rod 27, and a nut ring 29 is threadedly installed on the screw head 28. The cutting blade includes a mounting plate 32 and a saw-shaped cutting knife 33, and the saw-shaped cutting knife 33 is connected to one side of the mounting plate 32, and a second polygonal hole 34 adapted to the polygonal rod 27 is provided on the mounting plate 32, and the mounting plate 32 is installed with the polygonal rod 27 through the second polygonal hole 34 and fixed with the nut ring 29. When in use, the cutting blade is installed through the polygonal rod 27, and the cutting blade is fixed by the adaptation of the nut ring 29 and the screw head 28. The cutting blade can be a saw-shaped cutting knife 33, which is convenient for cutting seedlings.

[0047] The automatic obstacle-clearing device for the grass-stone isolation belt rotates the rotating arm 4 so that the track part is folded inward, and the pin shaft 8 is fixed with the second fixing hole 6, so that it can be stuck on the grass-stone isolation belt, thereby moving for tracking, and cooperating with the cutting blade rotating under the driving cylinder 10 to realize automatic tracking and obstacle-clearing, which is efficient and fast. The rotating arm 4 can also be reset, and the pin shaft 8 is fixed with the first fixing hole 5, so that the track part is supported downward, and it can be operated on the green belt or on the road surface, with a wide range of applications, saving a lot of labor costs and reducing costs. In addition, the present invention installs the cutting blade through the polygonal rod 27, and fixes the cutting blade by matching the nut ring 29 with the screw head 28. The cutting blade can be a circular cutting disc 30, which is convenient for weeding, or a saw-shaped cutting knife 33, which is convenient for cutting seedlings, and convenient for changing to different environments. At the same time, by fixing the fixing bolt 16, the distance of the extension of the rod 3 in the sleeve 2 can be adjusted, thereby changing the spacing between the track parts on both sides, which is suitable for grass-stone isolation belts of different widths.

[0048] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An automatic obstacle-clearing device for a grass-stone isolation belt, comprising a middle compartment (1) and a crawler section, characterized in that: Both ends of the two sides of the central warehouse (1) are provided with sleeves (2), and the insides of the four groups of sleeves (2) are movably installed with insertion rods (3), and both ends of the four groups of insertion rods (3) are rotatably provided with rotating arms (4), and the crawler parts are provided with two groups, and the two groups of crawler parts are respectively arranged below the rotating arms (4) on both sides; Both ends of the insertion rod (3) are provided with a first fixing hole (5) and a second fixing hole (6); the rotating arm (4) is provided with a fixing block (7); the first fixing hole (5) and the second fixing hole (6) are located on a moving path of the fixing block (7); a pin shaft (8) is installed inside the fixing block (7); the pin shaft (8) is matched with the first fixing hole (5) and the second fixing hole (6); a driving bin (9) is provided at a middle position on the middle bin (1); and driving cylinders (10) are provided on both sides of the driving bin (9); and a cutting blade is rotatably provided below the driving cylinder (10); The track portion comprises a mobile bin (11) and track wheels (12), wherein a plurality of track wheels (12) are provided, and the plurality of track wheels (12) are rotatably arranged inside the mobile bin (11), the lower ends of the track wheels (12) extend out of the mobile bin (11), and tracks (13) are wound around the outer sides of the plurality of track wheels (12), a motor (14) is provided at one end of the inner side of the mobile bin (11), and the output end of the motor (14) is connected to a group of track wheels (12), the outer side of the mobile bin (11) is rotatably provided with side rollers (15), and a plurality of side rollers (15) are equidistantly arranged, a fixing bolt (16) is provided on the sleeve (2), and the lower end of the fixing bolt (16) extends to the inside of the sleeve (2), and the fixing bolt (16) is used to fix the insertion rod (3); By rotating the rotating arm (4), the crawler part is folded inwards and fixed with the pin shaft (8) and the second fixing hole (6) so as to be clamped on the grass and stone isolation belt for track-finding movement. By resetting the rotating arm (4), the pin shaft (8) and the first fixing hole (5) are fixed so that the crawler part is supported downwards and is used for operation on a green belt or a road surface.

2. The automatic obstacle removal device for grass-stone isolation belt according to claim 1 is characterized by: An inner cavity (17) is provided inside the middle chamber (1) and the driving chamber (9), and a motor (18) is provided at one end of the inner cavity (17). A worm (19) is provided at the output end of the motor (18). A rotating shaft (20) is rotatably provided in the middle of the inner cavity (17), and a worm wheel (21) matched with the worm (19) is provided at the middle position of the rotating shaft (20).

3. The automatic obstacle removal device for grass-stone isolation belt according to claim 2 is characterized by: The rotating shaft (20) is located inside the driving bin (9), and both sides of the rotating shaft (20) extend to the inside of the driving cylinder (10) on both sides respectively. A rotating disk (23) is rotatably provided inside the driving cylinder (10) via a bearing ring (22), and a first bevel gear (24) is provided above the rotating disk (23). Second bevel gears (25) are provided on both sides of the rotating shaft (20), and the second bevel gear (25) is matched with the first bevel gear (24).

4. The automatic obstacle removal device for grass-stone isolation belt according to claim 3 is characterized by: A battery pack (26) is provided at one end of the inner cavity (17), and the battery pack (26) is used to supply power to the motor (18) and the motor (14).

5. The automatic obstacle removal device for grass-stone isolation belt according to claim 4 is characterized by: A polygonal rod (27) extending from the driving cylinder (10) is provided below the rotating disk (23), and a screw head (28) is provided below the polygonal rod (27), with a nut ring (29) threadedly mounted on the screw head (28).

6. The automatic obstacle removal device for grass-stone isolation belt according to claim 5 is characterized by: The cutting blade is a circular cutting disc (30), and a first polygonal hole (31) adapted to the polygonal rod (27) is provided inside the circular cutting disc (30). The circular cutting disc (30) is mounted on the polygonal rod (27) via the first polygonal hole (31) and fixed with a nut ring (29).

7. The automatic obstacle removal device for grass-stone isolation belt according to claim 5 is characterized by: The cutting blade comprises a mounting plate (32) and a saw-shaped cutting blade (33); the saw-shaped cutting blade (33) is connected to one side of the mounting plate (32); a second polygonal hole (34) matching the polygonal rod (27) is provided on the mounting plate (32); the mounting plate (32) is mounted on the polygonal rod (27) via the second polygonal hole (34) and fixed with a nut ring (29).

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