JP2014018438A - Sterilizer of sand - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sterilizer of sand having a simple structure, for sterilizing sand economically and effectively.SOLUTION: The constitution of a sterilizer of sand comprises: a cylindrical body including an input port into which a liquid bactericide is introduced, for inputting sand to the upper side of the lower end therethrough, and a discharge port for discharging therefrom treated sand to the lower side of the upper end, and installed obliquely on a sterilizing place; an inner plate having a circular cross section, installed on the floor board side of the cylindrical body from the periphery of the input port to the periphery of the discharge port; a screw conveyor arranged so as to have a clearance with the inner plate, and moved from the input port position to the discharge port, while mixing sand with the bactericide; and a motor for rotating the screw conveyor; wherein the bactericide is returned to the lower side of the lower end through the interval between the inner plate and the floor board of the cylindrical body and the clearance so as to be reused.

Description

  The present invention relates to a sand sterilizing apparatus capable of economically and effectively sterilizing sand in a sandbox of an educational facility or park.

  As a sand sterilizer, the invention of Patent Document 1 is disclosed. The apparatus for producing bacterial growth-inhibiting sand of Patent Document 1 has a strong bacterial growth-inhibiting action by easily and evenly mixing an antibacterial material with an appropriate mixing ratio by automating sterilized regenerated sand that has been sterilized. A method for producing bacterial growth-inhibiting sand that can be immediately and permanently exerted, and is stored in regenerated sand S1 that has been completely sterilized by the sand sterilizing and regenerating apparatus 1 and in a hopper-like tank 20 of the antibacterial material supply means 2 The antibacterial material 4 is supplied to the stirring and mixing discharge means 3 at a predetermined mixing ratio. In the stirring and mixing discharge means 3, the regenerated sand S1 and the antibacterial material 4 are sent to the discharge port 34 with sufficient stirring by the rotation of the screw conveyor 30 and the plurality of stirring blades 31 and 31, and the sterilized regenerated sand S and The antibacterial material 4 is discharged as bacterial growth inhibition sand S2 in which the antibacterial material 4 is evenly mixed.

  However, in the invention of Patent Document 1, the antibacterial agent is uniformly mixed with sand, and the amount of the antibacterial agent used increases with the amount of sand treated. Furthermore, since the screw conveyor has a monotonous spiral structure, it is not easy to produce the screw conveyor.

JP 2001-213703 A

  Then, an object of this invention is to provide the sand sterilizer of the simple structure which sterilizes sand economically and effectively.

In order to solve the above problems, the present invention
(1)
A liquid sterilizer is introduced, and a cylinder that is provided obliquely at a sterilization place is provided with an inlet for introducing sand above the lower end and an outlet for discharging treated sand below the upper end,
An inner plate with an arc-shaped cross section installed on the floor plate side of the cylindrical body from the vicinity of the inlet to the vicinity of the outlet;
A screw conveyor that is arranged with the inner plate and clearance and moves from the inlet position to the outlet while mixing the sand and disinfectant,
It consists of a motor that rotates the screw conveyor,
The sterilizing agent is configured to be reused by returning the sterilizing agent through the clearance between the inner plate and the cylindrical floor plate and below the lower end portion.
(2)
The screw conveyor is
The shaft is connected by a square columnar shaft rotated by the motor, a plurality of flat blades fixed in steps substantially perpendicular to two opposite side surfaces of the shaft, and between the flat blades adjacent to each other on the opposing shaft surface. The sand sterilization apparatus according to (1) is composed of a plurality of inclined blades fixed to the other two side surfaces, and forms a spiral as a whole.
(3)
The liquid disinfectant is
It is set as the structure of the sand sterilizer as described in (1) or (2) characterized by being acidic electrolyzed water.
(4)
The clearance is
The sand sterilizing apparatus according to any one of (1) to (3), characterized in that the size is 8 mm to 12 mm.
(5)
The sand sterilizing apparatus according to any one of (1) to (4), wherein punch holes having a diameter of 6 mm to 10 mm are sparsely formed in the inner plate.
(6)
further,
A frame, a caster attached to the frame, a stopper for lifting the frame, four legs provided with a hole penetrating a side surface, and standing on the frame; It is provided with a pedestal consisting of a pin that is inserted and locked into a tube provided on the cylindrical floor plate,
The sand sterilization apparatus according to any one of (1) to (5), wherein the cylindrical body is placed obliquely on the base portion.
(7)
A plurality of holes in the leg are drilled in the standing direction of the leg, and by changing the insertion position of the pin,
The configuration of the sand sterilization apparatus according to (6) is characterized in that the height and inclination angle of the cylindrical body are variable.

  Since this invention is a compact structure, it is easy to carry and sand can be sterilized at the place where sand is installed. Moreover, since the liquid disinfectant is reused repeatedly, it is economical. Manufacturing is easy because the screw conveyor forms a spiral shape as a whole by fixing the blades (flat blades, inclined blades) stepwise to the square columnar shaft, that is, exhibits the function of the helical structure. In addition, by arranging the outer periphery and inner plate of the rotation orbit of the screw conveyor with a clearance, the discharge rate of the liquid disinfectant is reduced and it can be reused repeatedly, which is economical.

It is a perspective schematic diagram (partial perspective) of the sterilization apparatus of sand which is the present invention. (A) is a plane partial perspective schematic diagram when a top plate is removed from a cylinder, and (B) is a plane partial perspective schematic diagram when a screw conveyor is rotated by 90 ° in FIG. 2 (A). FIG. 3 is a schematic enlarged sectional view taken along line AA in FIG. 2. It is a bottom face schematic diagram except a base part. It is a sterilization test result of sand.

  Hereinafter, the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to an Example.

  1 to 4 show a sand sterilizing apparatus 1 according to the present invention. The sand sterilizer 1 includes a cylinder 2, an inner plate 3, a screw conveyor 4, a motor 5 that rotates the screw conveyor 4, a hopper 6, and an acidic electrolyzed water generator 7. It is an apparatus that is carried into a processing site and transported while mixing a liquid sterilizing agent and sand 8 to sterilize sand 8. At the time of installation, it is preferable to include a base portion 9 on which the cylindrical body 2 is placed.

  Sand 8 is sand for educational facilities, park sandboxes, etc., but also includes sand for other purposes, small stones (gravel) and the like.

  1 to 4, the cylindrical body 2 is disposed on the top plate 2c constituting the upper surface, the floor plate 2e constituting the lower surface, the left and right end portions of the top plate 2c, and the left and right end portions of the floor plate 2e. An internal hollow cylinder comprising two left and right side plates 2d and 2d and two end surface plates 2f and 2f that close the openings formed by the top plate 2c, the floor plate 2e, and the left and right side plates 2d and 2d, In the sterilization place, one end is set up (upper end) and the other end is set down (lower end). The screw conveyor 4 is accommodated in the internal hollow portion.

  Moreover, the cylindrical body 2 can be easily manufactured by forming a rectangular parallelepiped shape along the longitudinal direction of the screw conveyor 4 by welding a thin plate material such as a sheet metal. The top plate 2c is preferably openable and closable.

  In the case where the cylinder 2 is installed, the sand 2 to be sterilized and the charging port 2a into which the sterilizing agent is introduced are disposed above the lower end (top plate 2c) of the cylinder 2 and below the upper end of the cylinder 2 (floor plate 2e). The discharge port 2b for discharging the treated sand 8 opens toward the hollow portion.

  The inlet 2a is provided with a hopper 6 whose upper side is wide to facilitate the work of charging the sand 8 to be treated and the acidic electrolyzed water 7c into the inlet 2a. The hopper 6 may be fixed to the charging port 2a or detachably fitted.

  As shown in FIGS. 1 and 4, a cover 5 a that covers the motor 5 and a belt 5 b that transmits the drive of the motor 5 to the screw conveyor 4 is detachable and prevents water scattering on the lower end side of the cylindrical body 2. It is attached as follows. Reinforcing portions 5c and 5c for connecting and reinforcing are provided on the left and right between the lower end portion of the cylindrical body 2 and the cover 5a.

  2 and 3, the inner plate 3 is a semicircular arc-shaped plate installed on the floor plate 2e side of the cylindrical body 2 from the vicinity of the inlet 2a to the vicinity of the outlet 2b of the cylindrical body 2, The outer periphery of the rotation track of the screw conveyor 4 and a clearance 4e are provided.

  The clearance 4eg is desirably 8 mm to 12 mm if the sand is sand 8 or the like. If it is narrower than 8 mm, the amount of liquid sterilant discharged from the discharge port 2b increases and the circulation efficiency of the liquid sterilizer is poor. If it is larger than 12 mm, the amount of sand 8 circulated is large and the sterilization efficiency of the sand 8 is poor.

  As shown in FIG. 2, the end portion of the inner plate 3 and the end face plate 2f of the cylindrical body 2 are opened, the lower end bottom portion 2i communicates with the input port 2a, and the upper end portion opens the discharge port 2b.

  Further, as shown in FIGS. 2 and 3, punch holes 3 a are formed in the inner plate 3, and a liquid disinfectant is dropped onto the floor plate 2 e of the cylindrical body 2. It is desirable that the punch holes 3a are sparsely formed with holes having a diameter of 6 mm to 10 mm.

  If the diameter of the punch hole 3a is smaller than 6 mm, the amount of liquid sterilant discharged from the discharge port 2b is increased and the circulation efficiency of the liquid sterilant is poor. Processing efficiency is poor. Here, as shown in FIG. 2 and FIG. 3, the inner plate 3 is provided in a line on the inclined surface instead of the bottom. Other examples of the arrangement of the punch holes 3a include a plurality of examples on the inclined surface of the inner plate 3 and a staggered arrangement. In addition, when the punch hole 3a was formed in the inclined surface of the inner plate 3, the circulation efficiency of the liquid disinfectant and the sand processing efficiency were better than the punch hole 3a formed in the bottom of the inner plate 3.

  By forming the clearance 4e and the punch hole 3a and then inclining the cylindrical body 2, the acidic electrolyzed water 7c flows down the bottom 2h of the cylindrical body 2 as shown by a two-dot chain line arrow shown in FIG. Returning to the bottom 2i, it is used again for sterilization of the sand 8. Therefore, the discharge rate of the acidic electrolyzed water 7c is reduced, which is economical.

  On the other hand, the sand 8 that has flowed down from the clearance 4e and the punch hole 3a to the bottom end 2i is transferred again to the discharge port 2b side by the screw conveyor 4. Such sand 8 will eventually be discharged from the discharge port 2b.

  As shown in FIGS. 2 and 3, the screw conveyor 4 includes a quadrangular columnar shaft 4 a that is rotatably locked from the lower end portion to the upper end portion of the inner hollow portion of the cylindrical body 2, a flat blade 4 b, and an inclination It consists of blades 4c, and is rotated by a motor 5 (in the direction of the left elliptical arrow in FIG. 2) to transfer a mixture 8a of sand 8 and acidic electrolyzed water 7c from the inlet 2a to the outlet 2b while being mixed.

  The end of the screw conveyor 4 on the lower end side of the shaft 4a passes through the end face plate 2f, and a belt 5b is installed in the cover 5a. As shown in FIG. 4, the other end of the belt 5b is installed on the motor 5. The shaft 4a of the screw conveyor 4 is rotationally driven by the motor 5 via the belt 5b. An end portion on the upper end side of the shaft 4a is rotatably locked to a bearing 2g provided on the end face plate 2f.

  As shown in FIGS. 2 and 3, the flat blades 4 b are semicircular, and a plurality of flat blades 4 b are fixed to the two opposing side surfaces of the shaft 4 a in a substantially vertical step. The inclined blades 4c connect the adjacent flat blades 4b on the surfaces of the opposing shafts 4a, and are fixed to a plurality of other side surfaces different from the shaft 4a to which the flat blades 4b are fixed.

  That is, as shown in FIG. 2, the flat blades 4b on the same surface of the shaft 4a are arranged at equal intervals (P in FIG. 2) and face the flat blades 4b (upper side in FIG. 2A). The flat blade 4b on the surface (the lower side in FIG. 2A) is arranged with a certain displacement distance (P1 in FIG. 2). Thus, the screw conveyor 4 which forms a blade | wing in step shape becomes a spiral formation as a whole.

  If it is the screw conveyor 4 which consists of the square pillar-shaped axis | shaft 4a, the flat blade | wing 4b, and the inclination blade | wing 4c, a helical shape can be implement | achieved easily and at low cost.

  In the screw conveyor 4, if the arrangement distance (P) of the flat blades 4b is reduced, the transfer distance of the mixture 8a to be transferred becomes longer, and the mixing time of the sand 8 and the acidic electrolyzed water 7c becomes longer. On the other hand, the discharge speed of the processed product 8b becomes slow. The same applies to the displacement distance (P1) of the flat blade 4b. Considering the above points, the arrangement distance (P) and the deviation distance (P1) of the flat blade 4b may be appropriately selected depending on the shape of the non-sterilized product, the type of remaining bacteria, and the like.

  The acidic electrolyzed water generating device 7 is a device that electrolyzes an aqueous solution to which an electrolyte is added to produce acidic water containing chlorine, that is, acidic electrolyzed water 7c. It is known that the acidic electrolyzed water 7c has a bactericidal effect.

  As shown in FIG. 1, in the sand 8 sterilization site, acid electrolyzed water 7 c is made by the acid electrolyzed water generating device 7, and the acid electrolyzed water 7 c is introduced into the cylindrical body 2 from the hopper 6 through the tube 7 a.

  The acidic electrolyzed water 7c is suitable because there are no problems such as residue of the bactericide on the sand 8 and health damage. In addition, a liquid disinfectant can be used. In the sandbox, since infants and children play, it is important to select a substance that does not cause health damage when selecting a disinfectant.

  For example, as shown in FIG. 1, the base portion 9 has two long leg portions that are erected at two corners of a frame body 9 a assembled in a square shape with L-shaped steel and a frame body 9 a on the discharge port 2 b side. 9d and two left and right short leg portions 9h standing on the frame body 9h on the insertion port 2a side, and the cylindrical body 2 is placed and supported obliquely. At the inner four corners of the frame body 9a, a triangular reinforcing member 9e is fixed to increase the strength of the frame body 9a.

  The long and short leg portions 9d and 9h are provided with a plurality of holes 9f penetrating in a direction substantially parallel to the installation location. As shown in FIG. 4, the floor plate 2 e of the cylindrical body 2 is provided with two pipes 2 k and 2 k corresponding to the positions of the long and short legs 9 d and 9 h so as to be orthogonal to the longitudinal direction of the cylindrical body 2. It has been.

  The long and short leg portions 9d and 9h are inserted into the holes 9f and the pipe 2k provided in the floor plate 2e of the cylindrical body 2, and the cylindrical body 2 and the base portion 9 are connected by pins 9g. By appropriately selecting the hole 9f through which the pin 9g is inserted, the height of the cylindrical body 2 and the inclination angle α (FIG. 1) of the cylindrical body 2 can be adjusted.

  In addition, casters 9 b for moving the base portion 9 are provided at the bottoms of the four corners of the frame body 9 a constituting the base portion 9. Further, the frame body 9a is provided with stoppers 9c at the four corners adjacent to the casters 9b.

  The stopper 9c has a jack function and can move up and down relative to the installation location to lift or lower the frame body 9a. Accordingly, the cylinder 2 also moves up and down. By providing the caster 9b and the stopper 9c, the sand sterilization apparatus 1 can be moved and adjusted in height and fixed to the ground at the processing site.

  Next, the sterilization method in the sandbox by the sand sterilization apparatus 1 according to the present invention will be described. The sand sterilization apparatus 1 is loaded on a car bed or the like and carried into a sterilization site. At the place where the sand sterilization apparatus 1 is installed, the cylinder 2 is placed on the platform 9 while being inclined so that the discharge port 2b of the cylinder 2 is located at a high position (above). As described above, the inclination angle α of the cylindrical body 2 is adjusted by the hole 9f and the pin 9g.

  After the installation location is determined, the stopper 9c is operated to lift the platform 9, the caster 9b is lifted, and the sand sterilizer 1 is fixed to the installation location.

  Thereafter, as shown in FIG. 1, sand 8 to be sterilized and acidic electrolyzed water 7 c are put into a hopper 6. The sand 8 and the acidic electrolyzed water 7c are agitated by the screw conveyor 4 to become a mixture 8a, which is transferred from the lower end of the cylindrical body 2 to the upper end of the cylindrical body 2 (indicated by the one-dot chain line in FIG. 1). Meanwhile, the sand 8 is sterilized by the acidic electrolyzed water 7c.

  Most of the sand 8 is discharged from the discharge port 2b as a processed product 8b. On the other hand, most of the acidic electrolyzed water 7c passes between the inner plate 3 and the clearance 4e of the screw conveyor 4 and flows down on the upper surface of the inner plate 3 until reaching the discharge port 2b, and further onto the floor plate 2e from the punch hole 3a. It falls and flows down on the upper surface of the floor board 2e (two-dot chain arrow in FIG. 1) and returns to the lower end bottom 2i below the inlet 2a.

  Therefore, most of the acidic electrolyzed water 7c can be reused repeatedly without being discharged from the discharge port 2b, which is economical.

  FIG. 5 shows the results of examining the degree of sand sterilization when acidic electrolyzed water 7c is introduced as a liquid sterilizer into the sand sterilizer 1 of the present invention. At this time, the acidic electrolyzed water 7c had a pH of 2.9 and an effective chlorine concentration of 40 ppm.

  As shown in FIG. 5, for “A untreated sand basin sand” and “B sand basin sand A treated with acidic electrolyzed water”, the general viable cell count CFU / g (the number of bacteria contained in 1 g of sand) is Examined. For the inspection, a standard agar medium was used and cultured for 48 hours in a 35 ° C. thermostat.

As a result of the test, a general viable count of 1.2 × 10 ⁶ CFU / g was detected in “untreated sandbox sand”, but not detected in “sandbox sand sterilized with acidic electrolyzed water” ( <300 CFU / g). That is, it has been clarified that the sand in the sandbox can be sterilized or sterilized by using the electrolyzed water 7c as the sand sterilizing apparatus 1 and the sterilizing agent according to the present invention.

DESCRIPTION OF SYMBOLS 1 Sand sterilizer 2 Cylinder 2a Input port 2b Discharge port 2c Top plate 2d Side plate 2e Floor plate 2f End surface plate 2g Bearing 2h Bottom 2i Bottom bottom 2k Pipe 3 Inner plate 3a Punch hole 4 Screw conveyor 4a Shaft 4b Flat blade 4c Inclined Blade 4e Clearance 5 Motor 5a Cover 5b Belt 5c Reinforcement part 6 Hopper 7 Acidic electrolyzed water generator 7a Tube 7c Acidic electrolyzed water 8 Sand 8a Processed product 9 Base part 9a Frame body 9b Caster 9c Stopper 9d Long leg part 9e Reinforcing member 9f Hole 9g Pin 9h Short leg

Claims (7)

A liquid sterilizer is introduced, and a cylinder that is provided obliquely at a sterilization place is provided with an inlet for introducing sand above the lower end and an outlet for discharging treated sand below the upper end,
An inner plate with an arc-shaped cross section installed on the floor plate side of the cylindrical body from the vicinity of the inlet to the vicinity of the outlet;
A screw conveyor that is arranged with the inner plate and clearance and moves from the inlet position to the outlet while mixing the sand and disinfectant,
It consists of a motor that rotates the screw conveyor,
A sand sterilizing apparatus, wherein the disinfectant is reused by returning the disinfectant through the clearance between the inner plate and the cylindrical floor plate and below the lower end portion. The screw conveyor is
The shaft is connected by a square columnar shaft rotated by the motor, a plurality of flat blades fixed in steps substantially perpendicular to two opposite side surfaces of the shaft, and between the flat blades adjacent to each other on the opposing shaft surface. The sand sterilizer according to claim 1, comprising a plurality of inclined blades fixed on the other two side surfaces, and forming a spiral as a whole. The liquid disinfectant is
3. The sand sterilizing apparatus according to claim 1, wherein the apparatus is acidic electrolyzed water. The clearance is
The sand sterilizer according to any one of claims 1 to 3, wherein the sand sterilizer is 8mm to 12mm. The sand sterilizer according to any one of claims 1 to 4, wherein punch holes having a diameter of 6 mm to 10 mm are sparsely formed in the inner plate. further,
A frame, a caster attached to the frame, a stopper for lifting the frame, four legs provided with a hole penetrating a side surface, and standing on the frame; It is provided with a pedestal consisting of a pin that is inserted and locked into a tube provided on the cylindrical floor plate,
The sand sterilizer according to any one of claims 1 to 5, wherein the cylindrical body is placed obliquely on the platform. A plurality of holes in the leg are drilled in the standing direction of the leg, and by changing the insertion position of the pin,
The sand sterilizer according to claim 6, wherein the height and the inclination angle of the cylindrical body are variable.