JPS6315053B2 - - Google Patents

Description

[Detailed Description of the Invention] Conventionally, foundry sand has been produced by collecting and drying naturally deposited sand, or by washing and drying it, or by quarrying, crushing, and classifying high-quality rock to use as foundry silica sand. The quarried and crushed sand that is used has many corners and a large surface area, and the collected sand has a better shape than quarried sand, but it also has many corners and is prone to natural deposits and disintegration. There is also a lot of sexual sand.

If the surface area of sand is large, various binders, additives, etc. are used in excess of the appropriate amount to obtain a certain strength of the mold during mold making, resulting in poor filling properties, harming the cast product, poor workability, and poor economic performance. Not.

The same is true for fine sand, which is used as aggregate for special concrete that requires particularly high strength.

Furthermore, the resources of river sand and compost sand, which are used in large quantities for fine sand for concrete, are also on the verge of depletion. The conditions for collecting sea sand have deteriorated, and the salt content is causing problems with corrosion of concrete reinforcing bars.

Conventional sand refining equipment mainly uses a mechanism that uses centrifugal force or wind power due to the rotation of rotary blades, or uses a strong air flow to strike the sand with a collision plate, vane plate, etc. At the time of collision, the sand is stripped of deposits on the surface of the sand, and the sand is removed. Most of the machines have a mechanism to break the corners and sharpen them into a circular shape.

The powerful air flow mechanism has a weak impact force on the sand, so there is little risk of impact.

The rotating blade mechanism increases impact force and impact strength, prevents blade wear, suspends sand, and discharges dust to the outside. Although it is excellent in generating airflow, since the force at the time of impact is at a large angle toward the center of the sand, it destroys the sand, reduces the yield of sand, and generates more dust.

The density of sand inside the machine during operation is low and the amount of sand processed is small.

As a result, the internal volume of the machine becomes large, resulting in high horsepower and excessive airflow, and the size of attached equipment such as dust collectors increases, power consumption and equipment costs increase.The blade structure is effective in refining sand, but Therefore, if foreign matter gets mixed in, the machine will be severely damaged and fatal.

It has many disadvantages and disadvantages and is not economical.

The present invention eliminates these drawbacks and shortcomings, reduces unnecessary starting force, wind force, and sand movement, increases the density of sand in the machine during operation, and increases the sand surface abrasion tendency. The power is used only for sand surface polishing, which is highly economical.Refining foundry sand or recycling old sand, quarrying aggregate for concrete, and polishing the surface of small particles generated during crushing to create aggregate for concrete. This is a sand polishing and refining device that can refine even fine sand.

This device connects and attaches a shaft 3 to the side plate 2 of a horizontally oriented casing 1, and fixes it with a bearing 4, making the inner peripheral wall surface and the inside of the side plate strong and hard against wear. The surface is covered with an abrasive material 7 made of a grindstone with many unevenness, holes 5 are provided in several places on the side plate 2 to discharge sand and dust, and stirring blades 18 are attached to the outside to suspend the dust remaining in the sand. An abrasive material 11 of the same quality as the abrasive material 7 can be freely moved to the horizontal rotating shaft 10 inserted into the rotating body 8 through a hole near the center of the side plate 9 while polishing the sand inside the outer rotating body 8. When installed with a sufficient predetermined space, the raw sand input from the sand input port 15 comes into strong contact with the surface of the abrasive material 7 due to the rotation of the outer rotating body 8 while floating, and a part of the surface of the sand is abraded. The sand grains rotate and fly off in the direction of rotation of the outer rotary body 8, and the sand grains collide with each other at a small angle rather than at a large angle toward the center, so the sand is given rotation and is less likely to be destroyed.

Abrasive material 11 of internal rotating body 14 with different rotation directions
When the sand collides again at a small angle and the direction of rotation and flight suddenly change to opposite directions, a part of the contact surface of the sand surface is scraped. This movement is repeated at a high speed and evenly, and the surface of the sand is polished in a very short time.The sand is mixed with dust while maintaining a high degree of polishing by the air flow generated by the dust collector suction from the air intake port 15. It moves freely and is discharged. Dust is conduit 1
6 to the dust collector, the remaining dust is suspended by the stirring blade 18 and sucked into the dust collector, and the polished sand is taken out from the outlet 19. The power of the prime mover is effectively used to polish the sand surface, there is no wasted movement, there are few changes in operating conditions, and the mechanism and operation are simple, reducing equipment costs.
A sand surface with a mechanism that has low maintenance costs and is highly flexible due to the rotation direction and speed of the outer rotary body 8 and the inner rotary body 14 depending on the quality, shape, size, purpose of use, and operation of stopping one of the rotations. This is an economical sand polishing and refining device for polishing.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of the present invention, and FIG. 2 is a partially cutaway plan view of the same. 1: Casing, 2: Side plate, 3: Shaft, 4: Bearing, 5: Discharge port, 6: Prime mover, 7: Abrasive material, 8:
Outer rotating body, 9: side plate, 10: horizontal rotating shaft,
11: Abrasive material, 12: Bearing, 13: Prime mover, 1
4: Internal rotating body, 15: Raw sand air injection inlet, 1
6: Conduit, 17: Cover, 18: Stirring blade, 1
9: Outlet, 20: Bearing stand.

Claims (1)

[Claims] 1 Consists of a shaft 3 connected to the side plate 2 of the casing 1, which is a hollow cylindrical shape turned horizontally, and its bearing 4, a sand and dust outlet 5 on the side plate 2, a prime mover 6, and a grindstone on the inner peripheral wall of the casing 1. An abrasive material 11 of the same quality as the abrasive material 7 is placed in a predetermined space on a horizontal rotating shaft 10 that is inserted into a hole in the center of the side plate 9 on the opposite side of the side plate 9 and the outer rotating body 8 to which the abrasive material 7 is attached. A suction port 15 is provided in the negative pressure zone near the center of the side plate 9, and the sand and air are discharged from the discharge port 5 along with the sand. A conduit 16 and a cover 17 that guide the remaining dust to the dust collector, and a stirring blade 18 that suspends the remaining dust.
is attached to the outside of the side plate 2 of the outer rotating body 8, and an outlet 19 for the polished sand is provided at the bottom of the cover 17. Depending on the quality, shape, size, and purpose of use of the raw sand, the outer rotating body 8 and the inner rotating body 14. A sand polishing and refining device characterized in that the surface of sand is polished by operating operations such as rotation direction, speed, and stopping one of the 14 rotations.