JPH0976159A - Shot separator of shot blast device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To separate a shot from a mixture of the shot and sand after grinding/ polishing and cleaning at higher precision. SOLUTION: A horizontally movable rotating drum type magnetic force separator 5 is made to face a dropping area of a mixture of a shot and sand, and a separation chute 12 of the shot and sand is provided below the magnetic force separator 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shot blasting device for removing sand from a cast product for effectively recirculating shots after blasting and cleaning. A shot separator configured to pass a mixture of shot and sand after sweeping through the passage to separate the shot and sand in the magnetic field.

[0002]

2. Description of the Related Art As a conventional shot separator of this type, there is, for example, one disclosed in Japanese Patent Publication No. 52-41510. The separator allows a mixture of shots and sand after sweeping to pass through a passage facing a magnet with a magnetic field applied, and causes wind force to act on the mixture to blow away the sand and small shots that are crushed or worn. ing.

[0003]

By the way, in the above-mentioned shot separator, if the wind force is too strong, there is a possibility that reusable shots may be separated together with sand. On the other hand, if the wind force is too weak, or if the sand falls in blocks,
Sand is mixed into the shot, and the shot separation accuracy deteriorates. The present invention has been made in view of such circumstances, and an object thereof is to separate shots from a mixture of shots and sands after blasting with higher accuracy.

[0003]

In order to achieve the above object, the present invention provides a horizontally movable rotary drum type magnetic separator facing a dropping area of a mixture of a shot and sand, and a lower part of the magnetic separator. It is characterized by the provision of a chute for separating shots and sand.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below. FIG. 1 is a vertical sectional front view of an essential part of the device of the present invention. In the figure, 1 is a hopper that stores a mixture of shots after blasting and sand separated from the casting product by blasting, and the lower end opening of the hopper 1 is attached to the tip of a piston rod 3 of a cylinder 2. It can be opened and closed by a gate 4 that moves horizontally. Below the hopper 1,
The rotating drum type magnetic separator 5 is arranged at a position facing the falling area of the mixture of shot and sand. The magnetic separator 5 is mounted on the tip of a piston rod 7 of a cylinder 6 and horizontally moved, a gantry 8 mounted on the gantry 8 and vertically rotated clockwise in the drum 9, and the drum 9 in the drum 9. The magnet 11 has a half-moon shaped longitudinal section disposed along the axis of the magnet 9. The magnet 11 has an outer peripheral surface on the side facing the falling area of the mixture of shot and sand on the drum 9. It is fixed on the gantry 8 so as to approach the inner peripheral surface. The expansion and contraction of the piston rod 7 allows the drum 9 to be moved and adjusted in a direction approaching the falling area of the mixture of shot and sand or in a direction away from the falling area. Below the magnetic separator 5, a separating chute 12 having a V-shaped vertical cross section is disposed with its top portion slightly displaced to the left of the drop area of the mixture of shot and sand.

In the above structure, the gap L between the falling area of the mixture of shot and sand and the outer peripheral surface of the drum 9 in the magnetic separator 5 is set to a predetermined distance, and the gate 4 is opened to open the hopper. When the mixture of shot and sand is dropped from No. 1, the shot a in the mixture is attracted to the outer peripheral surface of the drum 9 by the magnetic force and reaches the lower surface of the drum 9 as the drum 9 rotates, whereupon the magnetic force disappears. It separates from the drum 9 and is guided to the left slope of the separation chute 12 and accommodated in a shot receiver (not shown). on the other hand,
The sand b in the mixture falls vertically, is guided to the right slope of the separation chute 12 and is stored in a sand receiver (not shown). Note that some of the shots separated in this way include those that have shattered or worn down due to scouring, so only those that can be reused in the next stage will be separated by wind separation. To do.

[0007]

[Experimental Example] Using the above apparatus, the inventor tested the effect of separating sand on a mixture sample of three types of shots and sand having different sand mixing ratios. The results are shown in the graph of FIG. In the horizontal axis of the graph, + indicates that there is a gap between the falling region of the mixture and the outer peripheral surface of the drum 9 in the magnetic separator 5, and − indicates that both overlap (as a result, A part or the whole of the mixture falls on the outer peripheral surface of the drum 9), and 0 indicates that there is no gap between the two. From the above test, the greater the degree of overlap (-) between the falling area of the mixture and the outer peripheral surface of the drum 9, the worse the degree of separation between the shot and sand, and the poor degree of separation is that the mixing ratio of sand in the mixture is large. It turned out that the smaller the size, the more remarkable. Further, the degree of separation between the shot and the sand becomes maximum when there is a slight gap (+) between the falling area of the mixture and the outer peripheral surface of the drum 9. However, if the gap (+) is too large, the magnetic force of the mixture becomes large. Does not work well and the resolution is reduced.

[0008]

According to the present invention as described above, only the magnetic force acts on the mixture of the shot and the sand, so that the reusable shot is not separated together with the sand.
In addition, the separation chute was placed below the rotating drum type magnetic separator, and the vertically falling one of the above-mentioned mixture was allowed to enter the sand receiving side. It does not mix. Further, the shot can be separated from the mixture with higher accuracy by appropriately adjusting the gap between the falling area of the mixture and the outer peripheral surface of the drum according to the mixing ratio of sand in the mixture.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a main part of a device of the present invention.

FIG. 2 is a graph showing the influence of the gap between the magnetic separator and the falling region of the mixture on the degree of shot separation.

[Explanation of symbols]

 5 Rotating drum type magnetic separator 9 Drum 11 Magnet 12 Separation chute

Claims (1)

[Claims] 1. A horizontally movable rotary drum type magnetic separator 5 is made to face a falling area of a mixture of shot and sand, and a shot and sand separating chute 12 is provided below the magnetic separator 5. A shot separator for a shot blasting machine.