JPS61249552A - Method and apparatus for improving property of sand - Google Patents

Abstract

PURPOSE:To enhance the washing effect by means of a small amount of washing solution by giving a centrifugal force to the sand having the surface water which contains a salt content and mud content in a cone-shaped cylinder while separating the surface water and by moving the sand continuously toward the discharging direction. CONSTITUTION:The sand having the surface water is introduced from an introducing port 17 into a rotary cylinder 1 while being given the rotational energy in a high speed rotating shaft. The introduced sand is carried by a screw conveyor 3 toward the discharging port 19 while separating the adhering water in the rotary cylinder 1 which is rotating at a high speed having a slightly quicker rotating speed difference than that of the shaft 4 of the screw conveyor. While the washing solution is being given the rotational force in the cylindrical hollow part of the shaft 4 of the screw conveyor, said solution is ejected against the sand which is being carried from an ejecting port 8 provided at the shaft to the central vicinity of the rotary cylinder in order to wash the sand.

Description

[Detailed description of the invention] [Description of the field to which the invention pertains]

The present invention is a method for improving the properties of sand with less impurities and consistent surface water for use by separating sand rods having surface water containing salt and mud, or further separating them after washing. It is related to the device.

[Description of prior art]

In recent years, ready-mixed concrete and concrete 2 using sea sand have been developed.
In the following products, quality defects due to salt damage have become a social problem, and desalination is required when sea sand is used. Conventionally, sea sand was collected from the seabed and then desalinated by sprinkling fresh water on board a transport ship, or by piling it up on land and sprinkling fresh water on it. On the other hand, in ready-mix concrete factories and secondary product factories,
Many open-air sand storage facilities are used, and the surface moisture of the sand changes constantly due to exposure to wind and rain, which requires extra effort such as constantly measuring the surface moisture and correcting the amount of mixed water before using the sand. and was labor-intensive. In conventional technology, a certain amount of fresh water is sprinkled on the sand in advance to remove salt contained in the sand and to adjust the surface water of the sand to a certain level, and the sand is ejected using a rotating drum or rotary table. The particle surface of the surface water was separated from the surface by colliding with a collision plate. According to this type of method, the separation of surface water occurs only within the instantaneous time when the sand collides, and a sufficient effect may not be obtained, and the surface water after separation may vary depending on the initial amount of surface water. Secondary problems also occurred, such as the sand being crushed by the impact of the collision. In addition, even if we expected a desalination effect, we have not found any equipment equipped with a cleaning mechanism, so the initial objective cannot be achieved because the salt content is only reduced proportionally to the amount of separated surface water. This is the current situation.

[Description of structure and operation of the invention]

The present invention eliminates these drawbacks and will be explained with reference to one embodiment of the drawings. FIG. 1 shows an embodiment of the present invention, in which 1 is a rotating cylinder, one end of which is supported by a base 2, and the other end of which is a plurality of rollers 5 that rotate in contact with the shaft 4 of a screw conveyor 3. It is rotatably supported by The cylindrical hollow side of the shaft 4 of the screw conveyor is supported by a plurality of rollers 6 attached to the base 2, and the other end is supported inside the shaft of the rotating cylinder 1 and rotates with a slight difference in rotational speed from the rotating cylinder. is configured to do so. The outlet side of a screw feeder 9 is inserted into the cylindrical hollow side of the shaft 4 of the screw conveyor, and a sand introduction lower and a cleaning liquid injection port 8 separated from the introduction port and closer to the discharge direction are provided. There is. The casing of the screw feeder 9 is fixed to the base 2, and the shaft 10 of the screw feeder is supported at the end of the casing so as to be rotatable.The casing has an opening 1 for receiving sand.
1. The inside of the shaft 10 of the screw feeder is hollow and forms a supply port 12 for the cleaning liquid. Reference numeral 13 denotes a prime mover for rotationally driving the rotary tube 1 and the screw conveyor 3. 14.15.
The rotary cylinder 1 is configured to rotate at a slightly faster rotation rate than the screw conveyor 3 by the pulleys 16 and 17 and the continuously variable transmission 23. 18 is an outlet for separated water and liquid. Reference numeral 19 indicates a sand discharge port, and 20 indicates a collection frame for the discharged sand, which is formed to surround the discharge port 19 of the rotary cylinder, and its lower part is open as a sand discharge port. In the configuration illustrated in FIG. 1, the rotary cylinder support roller 5 rotates in contact with the screw shaft 4. Instead of simply being a roller, it may be a single bearing, and the roller 6 that supports the screw=shaft 4 may also be comprised of a single bearing. Further, the cleaning liquid supply port 12 may not be provided on the shaft 10 of the screw feeder, but may be provided on the opposite cylindrical hollow side of the shaft 4 of the screw conveyor. The rotary cylinder 1 does not need to be driven directly from the prime mover 13 by a continuously variable transmission 23 and pulleys 16 and 17, and a differential rotation device is provided at the position of the pulley 17 to control the rotational reaction force of the shaft 4 of the screw conveyor. It is also possible to have a structure that rotates by obtaining .

[Description of Operation] Next, the method and apparatus of the present invention will be explained in order of operation. The screw feeder 9 accepts the sand having surface water put into the mouth 11, and is continuously fed into the cylindrical hollow part of the shaft 4 of the screw conveyor by the screw feeder, which is rotationally driven by the prime mover 22, and rotates at high speed. It is introduced into the rotary cylinder 1 from the introduction lower while being given rotational energy within the shaft. The sand introduced into the rotary cylinder 1, which is continuously rotating at a speed difference that is much higher than that of the shaft 4 of the screw conveyor, is transported to the discharge port by the screw conveyor 3 while being separated from adhering water by centrifugal force at the same time as the sand is introduced. It is transported in 19 directions. From the cleaning liquid supply port 12 to the series 6
The sand cleaning liquid that is continuously supplied is given rotational energy in the cylindrical hollow part of the shaft 4 of the screw conveyor, and is conveyed from the injection port 8 provided in the shaft to the vicinity of the center of the rotating cylinder while separating the adhered water. It is sprayed onto sand that has been washed continuously. The sand sprayed and cleaned with the cleaning liquid is further separated from the cleaning liquid in the rotary cylinder and is continuously conveyed in the discharge direction by the screw conveyor 3, and is discharged from the discharge port 19 as improved sand that has been cleaned and dehydrated. It is collected in the collection frame 20 and discharged to the outside of the apparatus. The separated moisture and cleaning liquid flow out of the rotary cylinder 1 from the outlet 18 provided on the large diameter side of the rotary cylinder 1, and then flow into the casing 2.
1 is released from the bottom end of the device.

【Effect of the invention】

According to the method and apparatus of the present invention, sand having attached water containing salt and mud can be continuously received into the rotary cylinder by the screw feeder, and the sand is attached at the same time as it is received. After the sand begins to separate from water and is improved into sand with low salt and mud content and low water content, washing water is sprayed and washed, so a large cleaning effect can be achieved with a small amount of washing liquid. Furthermore, after cleaning, the sand remains in the same rotating cylinder for a certain period of time until it is transported from the cleaning position to the discharge port, and is continuously separated from the cleaning solution, resulting in high quality sand with a constant water content and few impurities. sand can be obtained continuously and effectively. Additionally, since this device uses centrifugal force to separate sand, water, and liquid, there is far less sand pulverization compared to this type of device that separates sand by colliding with a collision plate. . Depending on the initial properties of the sand, the amount of cleaning solution may be reduced or not applied at all, or the cleaning solution may be clean water or a chemical agent added to the sand to give it properties that match the purpose of use. can be improved. The present invention is an extremely excellent method and device that has the above-mentioned effects and advantages.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of one embodiment of the device of the present invention. 1...Rotating tube 2...Base 3...Screw conveyor 9...Screw feeder 13...
- Prime mover 20... Collection frame 21... Casing 22... Prime mover 23... Continuously variable transmission

Claims (2)

[Claims] (1) Sand with surface water containing salt and mud is transported inside a cone-shaped rotating cylinder that has a means for conveying it toward the discharge port.
The sand is continuously moved in the discharge direction while applying centrifugal force to separate it from the surface water, and cleaning liquid is sprayed onto the sand that has moved from the receiving port near the center of the rotating cylinder, and from the center to the discharge port. The cleaning liquid is again separated from the sand and discharged to the outside of the rotating cylinder, and the surface water of the sand is separated from the particle surface within the same rotating cylinder through the continuous separation-washing-separation action. A method for improving the properties of sand. (2) It is supported by a base and has a sand reception port, separated water and liquid outlet on the large diameter side, and a separated sand discharge port on the small diameter side, and rotates around a horizontal axis to remove sand. It has a cone-shaped rotating cylinder that separates water and cleaning liquid, and a screw conveyor inside the cone-shaped rotating cylinder that rotates with a slight difference in rotational speed from the rotating cylinder to continuously convey sand to the discharge port. The anti-discharge side of the shaft of the screw conveyor is shaped into a cylindrical hollow shaft to form a sand receiving passage, and a screw feeder for continuously supplying sand into the rotating cylinder is partially inserted into the cylindrical hollow shaft. At the same time, around the cylindrical hollow shaft, there is an inlet for guiding the sand supplied into the cylindrical hollow shaft into the rotating cylinder, and an injection port for injecting cleaning liquid into the vicinity of the center of the rotating cylinder. 2. A centrifugal separation type sand property improving device for use in the application according to claim 1, characterized in that the cleaning liquid is supplied from outside the rotating cylinder.