JPS6153487B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides, when constructing an athletic field made of sand-filled artificial turf, which is made by filling dry sand into the turf grains.
In particular, it relates to a sand spreading device used during finishing.

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, since the pile threads of artificial grass are considerably longer than those of natural grass and have a bulky structure, it is extremely difficult to fill the spread sand evenly into the grass grains by simply rubbing it lightly with a brush. be.

Therefore, it is an object of the present invention to provide an artificial turf athletic field that can uniformly adjust the sand thickness within the turf grain at the final finishing stage of the sand bowl, and then sprinkle and fill it with finishing dry sand. An object of the present invention is to provide a field sand spreading device.

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

FIG. 1 shows a schematic cross-sectional 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 traveling engine (not shown) and is configured to be self-propelled by the engine. It can be something. A hopper 2 for storing sand is mounted on the cart 1. in this case,
The hopper 2 is provided so as to straddle between both side plates of the truck 1, and is provided with a discharge port opened downward. Although not shown, a shutter plate is actually provided in connection with the discharge port to control the degree of opening thereof. Also,
The truck 1 has a belt conveyor 3 disposed below the hopper 2. This belt conveyor 3 consists of a pair of rollers 4, 4 that are pivotally supported at the front and rear parts of a cart 1, and an endless belt that passes between the rollers 4, 4 and passes below the discharge port of the hopper 2. In this case, one of the rollers 4, 4 is operatively connected to the aforementioned motor (not shown) as a driving source. The present invention also includes a rotating brush 6 which is placed behind the belt conveyor 3 and moves together with the cart 1 while rotating on the artificial lawn. As illustrated in FIG. 2, this rotating brush 6 is oriented in a direction perpendicular to the moving direction of the trolley 1, and is connected to the trolley via its rotating shaft 7 and a link arm 8 attached thereto. It is pivoted to the rear of 1. In addition, reference numeral 9 is a support shaft provided on the side of the truck 1, and 10 and 11 are the rotation shafts 7.
and a bearing hole of the link arm 8 which is bored so as to fit into the support shaft 9. Further, according to this embodiment, the rotary brush 6 is configured to be rotationally driven via a belt 13 by a driving means, such as a motor 12, mounted in the trolley 1. In this case, the rotating brush 6 is driven in a direction opposite to the moving direction of the truck 1, that is, if the truck 1 moves rightward in FIG. 1, it is rotated counterclockwise. The rotating brush 6 is made of bristles made of, for example, white hair or nylon, which are stronger than the synthetic resin pile threads A constituting the artificial lawn. Furthermore, in this embodiment, a weight 14 is replaceably attached to the link arm 8, so that the load applied to the rotating brush 6 on the artificial lawn can be changed.

Next, we will explain the function of this sand spreading device, but this is about the final finishing stage of sanding. It is assumed that sand has been filled in advance. First, put dried sand into the hopper 2. This sand is river sand,
Silicate mineral grains such as sea sand and silica sand are optimal, and the grain size is preferably about 5 to 8 so-called silica sand. Then, while running the cart 1 rightward in FIG. 1, the endless belt 5 of the belt conveyor 3 is moved counterclockwise in the figure, and then the motor 12 moves the rotating brush 6 counterclockwise in the figure, preferably. It is rotated at a circumferential speed faster than the moving speed of the cart 1. As a result, the sand stored in the hopper 2 is placed on the endless beret 6 from its discharge port, carried to the rear of the truck 1, and then spread on the rotating brush 6 described above. In this case, since the rotating brush 6 is rotated in the opposite direction to the moving direction of the truck 1 as described above, the sand prefilled in the grass grains between each pile yarn A is moved forward, that is, toward the truck 1 side. The surface of the turf is adjusted to be uniform as it is blown away, and the sand spread from the belt conveyor 3 is placed on the tips of the turf to fill the inside of the turf grain. In this way, the sand within the grain of the artificial lawn is formed to have a uniform thickness. In this regard, by selecting the weight 14, the sand thickness itself can be changed. In other words, if a relatively light weight is used, the sand thickness becomes thicker as shown in Figure 3, and the bouncing characteristics of the ball can be made faster.On the other hand, when a relatively heavy weight is used, the sand thickness becomes thinner, as shown in Figure 4. The bounce characteristics of the ball become slower.

In the above embodiment, the rotary brush 6 is rotated by the motor 12, but it is also possible to rotate the rotary brush 6 by using the driving engine of the truck 1. Furthermore, a mechanism for rotating the rotating brush 6 in forward and reverse directions is added, and in the basic stage of sanding, the rotating brush 6 is rotated in the same direction as the moving direction of the trolley 1 to increase the filling degree of sand in the grass grains. Rotating brush 6 is used during the final finishing stage of inserting.
may be rotated in the opposite direction.

As is clear from the description of the embodiments described above, according to the present invention, when sand is spread on an artificial lawn that is considerably longer and has a bulkier structure than a natural lawn, the thickness of the sand can be adjusted uniformly. However, the sand can be efficiently filled into the turf grain, making it extremely useful in constructing an artificial turf athletic field.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view schematically showing a sand spreading device according to the present invention, FIG. 2 is a perspective view showing a rotating brush portion of the device, and FIGS. 3 and 4 are sand spreading devices using different weights. It is an explanatory view showing an example of construction in which the thickness is adjusted. In the figure, 1 is a cart, 2 is a hopper, 3 is a belt conveyor, 6 is a rotating brush, and 14 is a weight.

Claims (1)

[Scope of Claims] 1. A device used for finishing an athletic field made of sand-containing artificial grass, which is formed by filling dry sand into the turf, comprising: a cart that moves on the artificial grass; A mounted hopper for storing sand, a belt conveyor that conveys the sand discharged from the hopper backward in the traveling direction of the trolley and sprinkles it on the artificial lawn from its terminal end, a rotating brush connected to the rear of the cart so that its axis of rotation is perpendicular to the traveling direction of the cart, and rotating the rotating brush in a direction opposite to the traveling direction of the cart at the sand falling position; a rotary brush driving means, and the artificial lawn mower is characterized in that sand is added while adjusting the level of the sand thickness previously filled in the grass grains by rotating the rotary brush in the opposite direction. Sand spreading equipment for stadiums. 2. The sand spreading device for an athletic field made of artificial grass according to claim 1, wherein a weight for adjusting the level of the sand thickness is replaceably attached to the rotating brush. Device.