JPS6153488B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sand spreading device for spreading and filling sand into the turf of an artificial grass sports field.

Generally, artificial lawns are made of flat pile threads made of synthetic resin such as polyamide or polyurethane, which are flocked onto a backing fabric. In this case, the grass grains are filled with sand in order to approximate natural grass as closely as possible in various properties, such as buffering capacity, ability to prevent spikes from getting caught, and moisture absorption capacity. Of course, the natural grass that makes up the greens of golf courses is also filled with sand, but the natural grass on the greens is short and the grain is not very dense, so the sand that is spread almost naturally. The sand gets into the grain of the grass and can be easily spread evenly by simply rubbing the grass surface lightly with a broom-shaped brush. However, the pile threads of artificial grass are considerably longer than the length of natural grass and have a bulky structure, so it is extremely difficult to evenly fill the spread sand deep into the grass grains by simply rubbing it lightly with a brush. Have difficulty.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a sand spreading device for an athletic field made of artificial grass, which is equipped with a brushing means that can efficiently and uniformly fill sand into the grains of the artificial grass while spreading sand onto the artificial grass. Our goal is to provide the following.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the accompanying drawings.

FIG. 1 shows a schematic perspective view of a sand spreading device constructed in accordance with the present invention. This sand spreading device includes a cart 1 that runs on an artificial lawn. In this embodiment, the trolley 1 has a motor (not shown) and is configured to be self-propelled by the motor; however, it may be of a towed type that is pulled by a winch via a wire rope or the like, for example. It's okay to be hot. A hopper 2 for storing sand is mounted on the cart 1. In this case, hopper 2
is provided so as to straddle between both side plates of the truck 1, and is provided with a discharge port 3 that is open downward. Although not shown, a shutter plate is actually provided in relation to the discharge port 3 to control its opening degree. Further, the truck 1 has a belt conveyor 4 arranged below the hopper 2. This belt conveyor 4
1 is pivotally supported at the front and rear of the truck 1.
It consists of a pair of rollers 5, 5, and an endless belt 6 that passes between the rollers 5, 5 and passes below the discharge port 3 of the hopper 2. In this case, one of the rollers 5, 5 is not shown in the drawings. The engine is operatively connected to the engine as a driving source. The present invention is provided with a brushing means 7 which is arranged behind the belt conveyor 4 and moves together with the cart 1 while rubbing the artificial lawn. The brushing means 7 includes a base frame 9 connected to the rear part of the truck 1 via vertically swingable connecting arms 8, 8, and a base frame 9 connected to the rear of the truck 1.
A plurality of rows, two rows in this embodiment, of brushes 10 are slidably mounted in a direction perpendicular to the direction of movement of the brushes 10.
a and 10b. In this case, as illustrated in FIG.
The guide rails 12a, 12b are supported by the above-mentioned connecting arms 8, 8 so as to be perpendicular to the traveling direction of the truck 1. On the other hand, the brushes 10a, 1
0b, each of the guide rails 12a, 12b
Slide plates 13a, 13 that are slidably engaged within the
b, and are driven reciprocatingly in opposite directions by brush driving means provided on the trolley 1 side. That is, each brush 10a, 10b has its own sliding plate 13.
Pins 14a and 14b implanted in a and 13b
and a lever 1 which is pivotally supported by a boss 15 protruding from the center of the lower surface of the crossbar 11 and has slits 16, 16 at both ends that engage with each of the pins.
7 so that they move in opposite directions. In this embodiment, one end of a drive arm 18 extending into the frame of the truck 1 is fixed to one slide plate 13a through a slit 17 formed at the rear of the truck 1. The other end is operatively connected to a motor 21, which is a drive source, via a disc crank 20 including a crank arm 19. Therefore,
The rotational driving force of the motor 21 is provided by the above-mentioned disc crank 2.
0, it is converted into a linear reciprocating motion, and is transmitted to one slide plate 13a via the drive arm 18. As a result, each brush 10a, 10
b are driven in a reciprocating manner parallel to the artificial lawn surface and in opposite directions along the left and right direction orthogonal to the traveling direction of the trolley 1. The brushes 10a, 10b are preferably made of bristles made of, for example, white hair or nylon, which are stronger than the synthetic resin pile threads that make up the artificial lawn.

Next, the operation of this sand sprinkling device will be explained. First, put dried sand into the hopper 2. As this sand, silicate mineral grains such as river sand, sea sand, silica sand, etc. are most suitable, and the grain size is preferably about 5 to 8 so-called silica sand. Then, while pulling the brushing means 7 through the connecting arms 8, 8, the trolley 1 is run in the direction of the arrow in FIG. 1, and the endless belt 6 of the belt conveyor 4 is moved counterclockwise in the same figure. As a result, the sand stored in the hopper 2 is placed on the endless belt 6 from its discharge port 3, transported to the rear of the cart 1, and then spread over the above-mentioned brushing means 7 and on the front side thereof. . In that case, to spread sand evenly over a wider area,
As shown in FIG. 3, a rotating brush 22 may be provided at the rear end of the belt conveyor 4. In this way, dry sand is spread on the artificial lawn, but in this invention, the motor 21 moves each brush 10a, 10b in opposite directions to each other along the direction perpendicular to the traveling direction of the trolley 1. Because it moves back and forth in the direction, the dry sand is attached to each pile thread A of the artificial lawn.
It is efficiently filled into the grass grains in between. That is, since each brush 10a, 10b advances while tilting each pile yarn A forward in its traveling direction as the cart 1 moves, each grass grain between each pile yarn A is widened, and each brush 10a, 10
As the pile yarns A are loosened by the horizontal movement of b, the dry sand is quickly filled into each grass grain as if it were being sieved off. in this case,
The movement stroke of each brush 10a, 10b depends on the distance between the grass grains, but in general, the optimum length is about 0.5 to 2.0 times the length of the pile yarn A.
Each brush 10a, 1 with respect to the tufting direction
The highest filling efficiency can be obtained by making 0b orthogonal.

Note that, unlike the above embodiment, both brushes 10a and 10b may be reciprocated in the same direction in some cases. It is also possible to provide two or more rows of brushes and to reciprocate them in opposite directions. In this sense, it is sufficient that at least two rows of brushes are provided.

As is clear from the description of the embodiments described above, according to the present invention, sand can be efficiently spread within the grains of an artificial lawn, which is considerably longer than a natural lawn and has a bulky structure. Moreover, it can be filled uniformly, and is extremely useful in constructing athletic fields made of artificial grass.

[Brief explanation of the drawing]

FIG. 1 is a perspective view schematically showing a sand spreading device according to the present invention, FIG.
The figure is a sectional view for explaining the action of the brushing means. In the figure, 1 is a trolley, 2 is a topper, 4 is a belt conveyor, 7 is a brushing means, 9 is a base frame, 10
a and 10b are brushes.

Claims (1)

[Scope of Claims] 1. A device for scattering and filling sand into the grain of an artificial lawn laid on a base made of cement, asphalt, etc., comprising: a cart that moves on the artificial lawn; and the cart. a hopper for storing sand mounted on top; a belt conveyor for transporting sand discharged from the hopper backward in the direction of movement of the cart and spreading it onto the artificial lawn from its terminal end; and a belt conveyor behind the cart; brushing means including at least two rows of brushes connected to the trolley and oriented in a direction substantially perpendicular to the direction of travel of the cart; A sand spreading device for an athletic field made of artificial grass, characterized in that it is equipped with a brush drive means for reciprocating along the sand scattering device. 2. The sand spreading device according to claim 1, wherein each of the brushes is driven by the brush driving means to reciprocate in relatively opposite directions.