JPH0365253A - Sand grinder - Google Patents

Abstract

PURPOSE:To solve loading in disks without stopping operation of a sand grinder by rising the rotation speed of the disks when the pressure in an outer box is detected and found increasing and strengthening the centrifugal power function to clean the disks. CONSTITUTION:An outer box 1 is separated into a tub for a suspension of beads and fine particles and a liquid tub after separation with a diaphragm 6. An flow inlet K1 is pierced into the outer box 1 and connected to the liquid tub after separation. A hollow part 4A is installed in a shaft 4 installed in a manner of piercing the diaphragm 6, and a groove 4B and a hole 1A which are connected to the hollow part 4A are respectively formed in a projected part in the tub for a suspension of beads and fine particles and in a part in the liquid tub after separation. The shaft 4 is rotated by motor M2 and at the same time, a plurality of disks 3 in a constant distance each other are arranged and fixed in the shaft 4 with the groove 4B.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to the structure of a filtrate section of a sand grinder.

[Conventional technology]

A sand grinder is a device that puts beads and a particle suspension in a tank, stirs them, and uses friction between the beads to make the suspended particles finer.The sand grinder takes out the finer particles along with the liquid. Separation device installed on a conventional sand grinder (
Wedge wire screens) are equipped with fixed nets or slits that allow only liquid to pass through. However, with fixed nets and slits, when the liquid passes through, cracked beads and foreign matter inevitably enter the gaps between the nets and slits, causing clogging. When the fluid flow becomes poor and a blockage occurs, the blockage cannot be cleared automatically and the operation is stopped.
I am forced to clean. Furthermore, if the gap is made larger to prevent clogging, the beads will flow out together with the liquid, making it impossible for the mesh or screen to function as a screen.

[Problem to be solved by the invention]

An object of the present invention is to provide a sand grinder that has less clogging and can automatically prevent clogging without stopping the operation of the sand grinder even if clogging is about to occur.

[Means to solve the problem]

In a sand grinder, the outer casing includes a partition wall that separates a suspension tank for beads and particles from a separated liquid tank, an inlet that penetrates the outer casing and connects to the suspension tank for beads and particles, and an outer casing. an outlet that penetrates through the partition wall and connects to the liquid tank after separation; and a part that penetrates the partition wall and has a hollow part, and a part that protrudes into the suspension tank of beads and fine particles communicates with the hollow part. a shaft having a hole communicating with the hollow part in a portion existing in the liquid tank after separation; a means for rotating the shaft; and a sensing means for sensing the pressure in the suspension tank of beads and fine particles. ,
Means for controlling the rotational speed of the shaft rotating means based on the output of the sensing means was provided. A plurality of disks stacked and fixed at regular intervals were attached to the shaft in the groove.

[For use]

As a sentry screen, the present invention has a configuration in which disks are arranged on one axis at regular gap intervals, and while the disks are rotated, the separated liquid passes through the gaps between the disks from the outer periphery of the disks toward the center. By doing so, even if beads or foreign objects try to adhere to the gaps between the disks, the beads or foreign objects that are heavier than the liquid will be pulled away from the disks by centrifugal force, preventing clogging. If foreign matter such as the like adheres and clogging occurs, there is a problem that the pressure inside the outer casing increases, and this pressure increase further promotes the clogging.Therefore, the present invention aims to reduce the pressure inside the outer casing. When the pressure increases, the rotation speed of the disk is increased, the centrifugal force described above is strengthened, and the disk is removed.
You can unclog the sentry screen without stopping the sand grinder operation.

[Example] Fig. 1 shows an overall configuration diagram of an embodiment of the sand grinder of the present invention. In Fig. 1, 1 is an outer casing, inside which beads B made of ceramic or the like are placed and fine particles such as paint are poured. The suspended liquid S flows into the inlet from 1, and the rotor 2 is rotated by the motor M1 to stir the liquid S and beads B together, making the particles in the liquid S fine, and adding particles to the liquid. Distribute evenly. 3 is a disk for solid-liquid separation according to the present invention, and as shown in FIG. A key groove is provided in the 0 disk, and the key is used to fix the shaft so that it rotates integrally with the shaft.As shown in FIG. As shown in Figure 2 A, a protrusion A is formed on the plate surface by pressing etc.
Or B (B has a different angular position with respect to the keyway than A) is set up so that the protrusion on one disc and the recess on the back of the protrusion on the disc in front of it do not match, so that the disc with protrusion A and the protrusion B are The disks are arranged alternately and placed one on top of the other so that the gaps between the disks are at the height of the protrusions, as shown in FIG. 2B. As shown in FIG. 3, the shaft 4 has a hollow portion 4A, and a groove 4B is provided at the front end portion where the disk 3 is fitted, penetrating it to the hollow portion 4A, and an outflow hole 4C is formed from the disk fitting portion. It is provided so as to penetrate to the hollow part 4A on the rear side, and the liquid after separation passes through the gap of the disk 3 and enters the groove 4B.
It enters the hollow part 4A from the hollow part 4A, and flows out of the shaft 4 from the hollow part 4A through the outflow hole 4C. Reference numeral 6 denotes a partition wall that divides the outer casing 1 into a suspension tank for beads and fine particles and a separated liquid tank. It is fixed to the shaft 4 at the rear of the disk 3 and in front of the outflow hole 4C provided in the shaft, and the gap between the rear end surface of the outer casing and the rear surface of the shielding plate 6 becomes a liquid tank after separation. It is used as an outflow path for the separated liquid flowing out from the outflow hole 4C. The outer casing 1 is provided with an outflow hole IA that connects to the separated liquid tank. Shaft 4 is connected to motor M2 via speed reducer 7. The shaft 4 is provided with a mechanical seal 10 to prevent liquid leakage, and has a structure that prevents liquid from leaking to the bearing 11 of the bearing. Returning to FIG. 1, 8 is a pressure sensor that senses the pressure inside the outer casing 1. 9 is an inverter that controls the rotation speed of the motor M2 based on the signal from the pressure sensor 8; when the pressure inside the outer casing increases, the rotation speed of the disk 3 increases; 3. Lower the rotation speed. In this way, the pressure of the suspension of beads and microparticles is kept constant, and the liquid flow rate is also kept constant. The outer casing 1 is connected by a hinge arm 12, and in the event that clogging occurs, the left side part of the outer casing can be swung by the hinge arm 12 so that the interior can be easily cleaned. In the above embodiment, the rotation speed is controlled by the motor via the inverter, but it may also be controlled by a speed reducer. [Effects] According to the present invention, by passing the separated liquid through the gaps between the rotating disks, foreign substances such as beads attached to the gaps between the disks can be pulled away from the disks by the centrifugal force of the disks. This made it possible to significantly reduce clogging. In addition, since the rotation speed of the disk is controlled by the pressure inside the outer casing, if the pressure inside the outer casing increases due to clogging, the rotation speed of the disk will be increased and foreign objects such as beads attached to the disk will be removed. By using a stronger centrifugal force to separate the screens, clogging can be automatically prevented, and there is no need to stop the equipment for screen cleaning, greatly improving operability. In addition, with the conventional filtration membrane method, if the flow rate is kept constant during use, the pressure will gradually increase.
When the liquid feeding pressure is kept constant, the flow rate decreases, but with the present invention, it has become possible to easily maintain a constant flow rate by feeding the liquid at a constant pressure.

[Brief explanation of drawings]

Fig. 1 is an overall configuration diagram of an embodiment of the present invention, Fig. 2 is a detailed view of the disk of the above embodiment, where A is a front view, B is a side view, and Fig. 3 is a diagram of the above embodiment. FIG. 3 is an explanatory diagram of a liquid flow path in FIG. Ml, M2...Motor, K1...Inlet, 1...
Outer casing, 2...rotor, 3...disc, 4...
Shaft, 5... Pressing plate, 6... Rotating release plate, 7.
...Decelerator, 8...Pressure sensor, 9...Inverter, 10...Mechanical seal, 11...Bearing, 12...Hinge arm.

Claims (2)

[Claims] (1) A partition wall that separates the beads and particulate suspension tank from the separated liquid tank inside the outer casing, an inlet that penetrates the outer casing and connects to the bead and particulate suspension tank, and an outer casing. an outlet that penetrates and connects to the liquid tank after separation; and a groove that is provided through the partition wall, has a hollow part, and communicates with the hollow part in a part that protrudes into the suspension tank of beads and fine particles. a shaft having a hole communicating with the hollow part in the part existing in the liquid tank after separation, means for rotating the shaft, and a plurality of discs stacked and fixed to the shaft at regular intervals in the groove part. A sand grinder comprising: (2) The first sand according to claim 1, further comprising a sensing means for sensing the pressure of the bead and fine particle suspension tank, and a means for controlling the rotational speed of the shaft rotating means based on the output of the sensing means. grinder.