JP2000308835A - Device for hygienically maintaining sandbox - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device which is capable of easily and cleanlily maintaining a sandbox with a saved cost and time by washing and heat treating the sand in the sandbox with good workability on site. SOLUTION: A series of the devices to continuously pass the sand in the sandbox through a sieve 2, to wash the sand on a conveyor 3 and to fire the sand in a firing device 5, then to return the sand to the sandbox are mounted on an automobile and are made movable.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for cleaning sand in a sandbox and keeping the sand clean.

[0002]

2. Description of the Related Art Sandboxes in nurseries and kindergartens are places for excrement of animals such as dogs and cats, and are rich in various germs such as Escherichia coli, Staphylococcus aureus, Salmonella, and green agriculture. At present, they are very nervous. For this reason, some sand is removed from the sandbox and washed and heat-treated.However, this process is carried out by parents and others by hand, using a sieve or scoop, etc. At present. In addition, there is a method in which the sand is replaced by a contractor, but the sand once taken out is processed in another place and replaced, so that it is time-consuming and expensive.

[0003]

SUMMARY OF THE INVENTION The present invention relates to an apparatus for cleaning and sanding sand in a sandbox at a site with good workability so that the sandbox can be easily and cleanly saved at a reduced cost and time. provide.

[0004]

SUMMARY OF THE INVENTION The present invention provides a sandbox,
A series of methods of continuously passing through a sieve, washing on a conveyor, sterilizing by baking in a baking machine, and returning to a sandbox can be performed by a device mounted on an automobile.

For example, in the apparatus of the present invention, sand in a sand pit is continuously passed through a sieve, washed on a water tank-type screw conveyor, and while sand is removed by a sand transfer machine, the sand is sent to a sand baking firing device. After the sand has been fired and sterilized in the firing device, clean sand is returned to the sandbox. A mesh belt conveyor or the like may be used for the sand transfer machine. However, since it is usually necessary to send the sand upward at an angle of 30 to 75 degrees, the sand from which water is cut off on the way is evenly distributed. It is difficult to send to a baking machine. Therefore, the scraper conveyor is used in the reverse of the usual method, the sand transfer machine is a device with a scraper conveyor mounted on the gutter, and the sand put in the lower part of the gutter is scraped by the scraper of the scraper conveyor, above the gutter. In this way, the sand was transported very efficiently and uniformly.

The firing device may be a screw conveyor type firing device, but is preferably a rotary drum type firing device. In this case, a plurality of baffle plates are provided on the inner wall of the drum. It is preferable that they are provided at equal intervals so as to form an acute angle with respect to each other. This baffle plate is a regular polygon (regular triangle,
When a square, a regular pentagon, or the like is drawn, the polygon is preferably provided so as to form part of a side of the polygon, or may be provided in multiple stages.

[0007] When a plurality of baffles are attached to the inner wall of the drum in the longitudinal direction, the baffles of each stage are arranged in a tandem manner from one end of the drum to the other end, and viewed from one end. Therefore, it is preferable that the intervals be equal. For example, if the baffle plate is mounted so that it is located on the side of a regular triangle whose corner is in contact with the inner wall of the drum,
Attach the baffle of the second stage at a position shifted by 60 ° from the mounting position of the first baffle so that it is located on the side of the equilateral triangle. When viewed from one end of the drum, the entire baffle is It is good to be located at the corner of the square, and in the three-stage type, the second-stage baffle is located on the side of the equilateral triangle at a position shifted by 40 ° from the mounting position of the first baffle, The baffle of the step is 80 ° from the position where the first baffle was attached.
By positioning it on the side of the equilateral triangle at the shifted position,
When viewed from one end of the drum, the entire baffle plate is preferably located at a corner of a regular nine-sided shape.

As described above, in the rotary drum type baking device having the baffle plate attached, the sand does not adhere to the inner wall of the drum.
Stirring is efficient, very uniform firing is possible, and sand is also easily discharged.

Although a single baking oven may be used, it is preferable to treat the sand by baking at a temperature of 100 ° C. or more for several tens of minutes. Containers are installed in parallel, and the sand sent by the sand transfer machine is
It is preferable to be able to sequentially switch into each firing unit at regular intervals.

[0010] In the firing device, sand is heat-treated by, for example, blowing hot air with a gas burner. The heat-treated sand is sterilized by hot air, and further subjected to firing, steam treatment, and the like.
Sterilization may be performed by hot water treatment, alcohol treatment, treatment with sterilizing light or ultraviolet light, or the like.

The outlet of the firing device of the apparatus of the present invention is
It is preferable to provide an air cooler and a sand discharging means (for example, an inclined plate or a belt conveyor) for cooling the heated sand, and the air cooling machine is provided on the sand discharging means, while cooling the sand. You may make it discharge | emit to a sandbox.

[0012] First, the mesh of the sieve for removing dust and the like from the sand is preferably about 2 to 8 mm in diameter, and the belt conveyor for washing the sand that has passed through the sieve is provided with a mesh. It is preferable to use a mesh conveyor so that sand can be washed by applying water pressure on the top. The mesh of this conveyor must, of course, be large enough to allow water but not sand.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One example of the apparatus of the present invention will be described with reference to the drawings. The apparatus shown in FIG. 1 is installed on a truck so that it can be transported. A belt conveyor 3 in the form of a mesh exists below the hopper 1, and a diameter of 3 mm is provided between the belt conveyor 3 and the discharge port of the hopper 1. The mesh sieve 2 is attached so as to be able to vibrate, and a water discharging means 4 for discharging washing water is provided above the rear side in the traveling direction of the belt conveyor 3.

Next, a drum type firing unit 5 is mounted so that the rear end of the belt conveyor 3 is positioned above the mouth thereof, and the drum type firing unit 5 blows hot air on the bottom outer wall with a gas burner. A belt conveyor 6 for discharging sand after treatment is disposed below a discharge port at the bottom of the drum type baking device 5. Air cooling means 7 is provided above the belt conveyor 6. After being washed and heat-treated, the cooled sand is fed from the conveyor belt 6 into the sandbox.

In this example, although not shown, a belt conveyor is arranged between the sandbox and the hopper 1, and when sand in the sandbox is placed on the belt conveyor with a scoop, the sand is automatically introduced into the hopper 1, Sieve 2 from outlet of hopper 1
Through the belt conveyor 3, the sand excluding dust is dropped on the belt conveyor 3, the sand is washed with water discharged from the water discharging means 4 on the belt conveyor 3, and then the drum type baking device 5 is automatically turned on.
To be sent to The sand calcined by the drum calciner 5 is cooled by the air cooling means 7 and is conveyed by the conveyor belt 6.
The sand in the sandbox can be cleaned without the need for human intervention.

The conveying speed of the belt conveyor 3 is set to 40 to 20.
m / min, the diameter of the drum type baking device 5 is 0.8 m, and the length is
When the sand in the sandboxes of three kindergartens (Y garden, O garden, M garden) was processed by the above-mentioned method at 2.0 m and the rotation speed at 6 RPM, when the water washing treatment was performed by the conventional method, Or, compared with the case of heat treatment, the sand can be replaced with very good workability and at low cost. Table 1 shows a comparison of the costs required to replace the sand.

[0017]

[Table 1]

Next, Table 2 shows the sterilizing effect of the sand treated by the method of the present invention in comparison with the sand before the treatment.

[0019]

[Table 2]

Next, the example of FIG. 2 will be described. In this example, hopper 1, quantitative controller 9,
An apparatus in which a sieve 2 and a water tank type screw conveyor 3a are set up and down is used by being lowered from a truck to the ground, and in this apparatus, the water tank type screw conveyor 3a is used.
A sieve 2 having a mesh of 3 mm in diameter is provided between the hopper 1 and the outlet of the hopper 1 so as to be able to vibrate.

As the sand transfer machine 10, a gutter 11 with a scraper conveyor 12 mounted thereon is used.
The sand introduced below the gutter 11 is removed from the scraper conveyor 1.
The scraper 12a is moved upward while being scraped by the second scraper 12a (see FIG. 3).

The firing unit has two rotary drum type firing units 5 arranged in parallel, and the sand sent from the sand transfer unit 10 can be selectively introduced into the mouth of each firing unit 5 at regular intervals. A loading direction switching machine 13 is attached. In addition,
In the rotary drum type baking device 5, a baffle plate is provided on the inner wall of the drum.
They are provided at equal intervals so as to form an acute angle with the drum inner wall 15. The baffle plate 14 has a drum introduction part, a central part,
The drum inner wall 1 is divided into three sections with the discharge section divided into three sections.
5, four baffle plates are respectively attached at positions that form a part of each side of a square whose corner is in contact with the drum inner wall 15, and an introduction portion, a center portion, The discharge portion and the mounting position are shifted from each other so that the state as a whole viewed from the mouth is located at the corner of a regular dodecagon as shown in FIG. The baffle plate 14a is located at the introduction portion, the baffle plate 14b is located at the central portion, the baffle plate 14c is located at the discharge portion, and the length of each baffle plate is about 1/3 of the drum length. It is.

In the apparatus using the sand transfer device 10 and the rotary drum type baking unit 5, the sand can be uniformly introduced into the baking unit 5, and the sand in the rotary drum type baking unit 5 can be reduced due to the presence of the baffle plate 14. Without sticking to the drum inner wall 15,
Efficient and uniform firing is possible, and the sand is easily discharged from the rotary drum type firing device 5.

The truck is equipped with a gas cylinder 16 for a gas burner for heating the rotary drum type baking unit 5, and the scraper conveyor 1 of the sand transfer machine 10.
The speed 2, the rotation speed and the temperature of the rotary drum type baking device 5 can all be operated on the operation panel on the truck.

[0025]

Since the apparatus of the present invention is mounted on an automobile such as a truck, it is possible to wash and heat the sand in a sandbox at the site with good workability. Also, since the water can be automatically washed and heat-treated later simply by putting the sand into the hopper or the like, the sand in the sandbox can be disinfected very economically and with good workability. In the apparatus using the sand transfer device 10 including the scraper conveyor 12 and the rotary drum type baking device 5 provided with the baffle plate 14, the sand in the sandbox can be processed reliably and very efficiently.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an example of the present invention.

FIGS. 2A and 2B show another example of the present invention, wherein A is a side view, B is a plan view in use, and C is a rear view in use.

FIG. 3 is a partially broken side view of a sand transfer machine used in the apparatus of FIG. 2;

FIG. 4 is a drawing showing a mounting state of a baffle plate of a rotary drum type baking machine used in the apparatus of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hopper 2 Sieve 3 Belt conveyor 3a Water tank type screw conveyor 4 Water discharging means 5 Firing device 10 Sand transfer device 11 Gutter 12 Scraper conveyor 12a Scraper 14a, 14b, 14c Baffle plate 15 Inner wall

Claims (6)

[Claims] 1. The sand in a sandbox is continuously passed through a sieve, washed on a conveyor, fired in a firing machine, and then returned to the sandbox. The sieve, the conveyor, and the firing machine are mounted on an automobile. And a device for keeping a sandbox sanitary, wherein the device can be arbitrarily moved to a place where sand cleaning is required. 2. After passing the sand through a sieve, the sand is washed on a water tank type screw conveyor, sent to a firing device mounted on an automobile by a sand transfer machine inclined upward, and fired and sterilized by the firing device. It is to return to the sandpit, the sand transfer machine is a gutter with a scraper conveyor attached on the gutter, so that the sand put in the lower part of the gutter is scraped by the scraper of the scraper conveyor, and sent to the upper part of the gutter. The apparatus of claim 1, wherein 3. The baking device is a horizontal rotary drum type baking device, wherein a plurality of baffles are provided at equal intervals on the inner wall of the drum so as to form an acute angle with respect to the inner wall of the drum. The apparatus according to claim 1 or 2, wherein 4. The baffle plate is provided so as to form a part of a side of the polygon when the polygon is drawn so that a corner is in contact with an inner wall of the drum in a cross section of the drum. 4. The apparatus of claim 3 wherein: 5. A baffle plate is attached to the inner wall of the drum in a plurality of stages in the longitudinal direction, and the baffle plates of each stage are provided in a tandem manner from one end of the drum to the other end thereof. 5. The device according to claim 3, wherein the device is arranged at equal intervals when viewed from one end. 6. The method according to claim 6, wherein a plurality of the baking units are provided in parallel, and the sand sent by the sand transfer machine can be sequentially switched into each of the baking units at regular time intervals. Apparatus according to any of the preceding claims, characterized in that: