JPS6138963Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a sand removal device suitable for constructing an athletic field made of sand-containing artificial turf by filling the grains of the artificial turf with fine sand.

In general, artificial lawns are made of flat filamentous pieces made of synthetic resin such as polyamide or polyurethane, which are flocked onto a backing fabric, for example. In this case, the grass grains are filled with sand in order to approximate natural grass as closely as possible in terms of various properties, such as buffering capacity, ability to prevent spikes from getting caught, and moisture adsorption 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 removed sand is almost naturally filled. 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 filamentous pieces of artificial grass are considerably longer than the length of natural grass and have a bulky structure, it is extremely difficult to fill the removed sand evenly within the grass grain by simply rubbing it lightly with a brush. It is. Therefore, this applicant
First, we applied for a device that could uniformly fill sand into the grains of artificial grass while removing it from the surface.
No. 57-210221. To explain this briefly, this device has a rotating brush attached to the rear part of a cart having a sand storage hopper so as to be perpendicular to the direction of movement of the cart, and the rotating brush is rotated in the direction of movement of the cart by a motor etc. It is configured to rotate in either direction or in the opposite direction. According to this, the grain of the artificial lawn is greatly expanded and moderate vibration is applied to the artificial lawn, so that the sand discharged from the hopper is efficiently and uniformly filled into the grain of the grass. However, on the other hand, it was found that some of the sand near both ends of the rotating brush was pushed out to the side, forming ridge-like traces on both sides along the path of the carriage.

Therefore, the purpose of this invention is to provide a sand removal device for an artificial grass sports field that can remove and fill sand into the grain of an artificial grass without producing the ridge-like traces described above. Our goal is to provide the following.

Hereinafter, this 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 removal device constructed according to this invention. This sand removal 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 self-propel using this 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,
In fact, a shutter plate is provided in connection with this outlet for controlling the degree of opening thereof. Further, the truck 1 has a belt conveyor 3 arranged 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. 5, in this case, rollers 4,
4 is operatively connected to the above-mentioned motor (not shown) as a driving source. In this invention, the trolley 1 is placed behind the belt conveyor 3 and rotates on the artificial lawn.
It is equipped with a rotating brush 6 that moves together. 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 rotating brush 6 is configured to be rotationally driven via a belt 13 by a driving means, for example a motor 12, mounted in the trolley 1. In this case, as illustrated in FIG. 3, the rotating brush 6 has a central portion 6a having approximately the same diameter;
Both end portions 6b, 6b are formed in the shape of a truncated cone, the diameter of which gradually decreases toward the ends. In addition, in the sand filling process at the beginning of turning, this rotating brush 6 is moved in the forward direction with respect to the moving direction of the cart 1, that is, if the cart 1 moves to the right in FIG. On the other hand, in the final finishing stage, it is driven to rotate counterclockwise in the figure. Further, the rotating brush 6 is preferably made of bristles made of, for example, white hair or nylon, which are stronger than the synthetic resin filament A constituting the artificial lawn. Furthermore, in this embodiment, a weight 14 is replaceably attached to the link arm 8, so that the load of the rotating brush 6 on the artificial lawn can be changed.

Next, the operation of this sand removal device will be explained. First, a case will be described in which sand is filled exclusively into the grain of the artificial lawn at the beginning of turning. As a preparatory step, dry sand is placed in 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. While the cart 1 is running rightward in FIG. 1, the endless belt 5 of the belt conveyor 3 is moved counterclockwise in the drawing, and then the motor 12 moves the rotating brush 6 clockwise in the drawing, and the cart 1 is moved in the clockwise direction in the drawing. Rotate at a peripheral speed faster than the moving speed of 1. As a result, the sand stored in the hopper 2 is placed on the endless belt 5 from its discharge port, carried to the rear of the truck 1, and then removed onto the above-mentioned rotating brush 6. In this case, since the circumferential speed of the rotating brush 6 is faster than the moving speed of the cart 1, each thread-like piece A of the artificial lawn
As it advances while tilting backward in its moving direction, each grass grain between filamentous pieces A is greatly expanded on the winding side, and as a result, the sand removed onto the rotating brush 6 is efficiently spread over the grass grains. The powder is filled into the interior of the container and spread almost uniformly by the bristles of the rotating brush 6. In this invention, as described above, since both end portions 6b, 6b of the rotating brush 6 are shaped like a truncated cone, ridge-like traces are not left on both sides of the path of the carriage 1 during this sand filling process. There are almost no In order to more effectively fill and level the sand with the rotating brush 6, it is preferable to apply vibration to the rotating brush using a vibrator or the like.

Next, a case will be described in which this sand removal device is applied to the final finishing stage of a sand container. That is,
Assuming that the grain of the artificial lawn is filled with sand to a certain thickness in the sand filling process described above, in this case, the rotating brush 6 is moved in the opposite direction to the moving direction of the cart 1. can be rotated in the same direction. Therefore, the rotating brush 6 adjusts the surface uniformly while brushing off the sand that has been filled in the grass grains between the filament pieces A forward, that is, toward the cart 1 side, and also adjusts the surface uniformly. The sand removed from step 3 is placed on the tips of the bristles to fill the inside of the grass grain. In this way, the sand within the grain of the artificial lawn is formed to have a more 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 becomes thicker as shown in Figure 3, making it possible to speed up the bouncing characteristics of the ball.On the other hand, if a relatively heavy weight is used, the sand becomes thinner as shown in Figure 4. This slows down the bounce characteristics of the ball. In this case, both end portions 6b, 6b of the rotating brush 6 are formed into a truncated conical shape as described above, and the wiping action against sand at these portions is weakened, so even during this final finishing, the cart 1 is No ridge-like markings are formed along both sides of the passageway. However, both end portions 6b, 6
The sand filling effect at step b will be reduced, but in this regard, the trolleys 1 may be run so that their travel paths overlap.

In this embodiment, sand discharged from the hopper 2 is conveyed to the rear of the cart 1 by a belt conveyor 3, but a rotating brush 6 is disposed below the discharge port of the hopper 2. Alternatively, the sand may be dropped directly onto the rotating brush 6 through a sieve plate or the like attached to the discharge port of the hopper 2.

As is clear from the description of the embodiments above, this invention allows sand to be applied to artificial lawns, which are considerably longer than natural lawns and have a bulkier structure, without forming ridge-like traces. It can be filled efficiently and uniformly into the ground, and is extremely useful in constructing an athletic field made of sand-containing artificial grass.

[Brief explanation of drawings]

Fig. 1 is a sectional view schematically showing a sand removal device according to this invention, Fig. 2 is a perspective view showing the rotating brush portion of the device, Fig. 3 is a front view of the rotating brush, and Fig. 4 FIG. 5 and FIG. 5 are explanatory diagrams showing an example of lathing in which the sand thickness is adjusted using different weights. In the figure, 1 is a truck, 2 is a hopper, 3 is a belt conveyor, 6 is a rotating brush, 6b is an end portion of the rotating brush, and 14 is a weight.

Claims (1)

[Scope of Claim for Utility Model Registration] A device for filling sand while removing it into the grain of an artificial lawn laid on a base, comprising a trolley that moves on the artificial lawn, the trolley comprising: , a hopper for storing sand, a rotating brush connected to the rear of the hopper so that the axis of rotation is perpendicular to the traveling direction of the trolley at the position where the sand discharged from the hopper falls, and the circuit brush forcibly and a rotary brush driving means for rotating the brush, characterized in that both end portions of the rotary brush are formed into a truncated cone shape whose diameter gradually decreases toward the end. Sand removal device for artificial grass sports stadiums.