JP3125276B2 - Foundry sand recycling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reclaiming apparatus for reusing casting sand after casting and removing the casting.

[0002]

2. Description of the Related Art Conventionally, various apparatuses for regenerating foundry sand have been developed, and most of them have been developed.
As disclosed in Japanese Patent No. 5328, used foundry sand (hereinafter referred to as old sand) is supplied to a rotary impeller, and the supplied old sand is projected and collided against a wall surface by the rotary impeller, thereby causing Attachments are removed. However, in such a method of reclaiming molding sand, the impact is too strong (adhesion cannot be removed if the impact is too weak), and the sand itself is crushed, and the sand is crushed to increase the amount of binder added to the use of reclaimed sand. There was a problem. The present invention has been made in view of the above problems, and an object of the present invention is to provide a casting sand recycling apparatus capable of efficiently recycling sand in a state where sand is not crushed.

[0003]

In order to achieve the above object, a casting sand reclaiming apparatus according to the present invention comprises a sand supply shot having a dropout opening at a lower end thereof, and a horizontal rotation below the supply shot. A rotating drum that is arbitrarily arranged and connects an inclined peripheral wall extending obliquely upward and outward from the peripheral end of the circular bottom plate and a weir that projects inward from the upper end of the inclined peripheral wall; One or more rollers arranged at a right angle with a slight gap, and a roller pressing mechanism connected to the rollers and pressing the rollers toward the inclined peripheral wall with a constant pressure. And characterized in that:

[0004]

According to the present invention, by adopting the above-mentioned solution, the waste sand continuously supplied into the rotary drum is subjected to the centrifugal force and is brought to the projection peripheral wall, and is sequentially deposited to reduce its thickness. The sand layer is formed while increasing, and the roller is rotated by the frictional force in contact with the roller, whereby the deposit on the surface of the old sand is separated and removed under a constant pressing force and shearing action. When the thickness of the sand layer further increases and reaches the height of the weir, the regenerated sand from which the deposits have been removed is discharged over the weir. Although the gap between the roller and the inclined peripheral wall expands due to the increase in the sand layer, the pressure applied by the roller is substantially constant, and the regeneration effect is substantially constant even if the roller is worn.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. A funnel-shaped sand feeder 3 is suspended from the upper end of a processing tank T in which a pyramid 2 is connected to the lower part of the rectangular tube 1, and the lower end of the sand feeder 3 is not shown. A drop-out port 4 through which a constant amount of sand flows down through the port is provided. A rotary drum 5 is provided below the sand supply shoe 3, and the rotary drum 5 has an inclined peripheral wall 5B extending obliquely upward and outward from the peripheral end of the circular bottom plate 5A, and an inclined peripheral wall 5B. And a weir 5C projecting inward from the upper end of each of them.

A rotary shaft 6 is fixed to the center of the lower surface of the circular bottom plate 5A of the rotary drum 5, and the rotary shaft 6 is rotated via a bearing 8 mounted on a hollow support frame 7. It is freely supported. The lower end of the rotating shaft 6 has V
A motor 9 having a pulley 9 mounted thereon and mounted on the support frame 7 outside the processing tank T
0 is rotatably connected to a rotating shaft 11 via a V belt 12 and a V pulley 13. In the rotary drum 5, two rollers 14.14 are provided with a slight gap with respect to the inclined peripheral wall 5B and at right angles to the inclined peripheral wall 5B. A support shaft 15.15 is relatively rotatably connected to the central portion of the upper surface of 14. The upper end of the support shaft 15.15 is in the horizontal direction (roller 14.
14 (which is parallel to 14) is fixed to one end of a support arm 16.16, the other end of which is vertically rotatably supported via a bearing 17.17. A horizontal axis 18.1 extending in a direction intersecting the arm 16.16
8 is connected to one end. The other end of the horizontal shaft 18.18 penetrates through the rectangular tube portion 1 and protrudes to the outside, and is fixed to the upper end of the rotating arm 19.19. Further, the lower ends of the two rotating arms 19.19 are connected by a cylinder 20 to constitute a roller pressing mechanism P as a whole.
That is, at all times, the rotating arm 19, the horizontal shaft 18, the arm 1
6, a constant pressure is applied to the roller 14.14 in the direction of the inclined peripheral wall 5B. In addition, a rotary arm is used instead of the cylinder 20 via a compression coil spring.
The same operation and effect can be obtained by connecting the lower ends of 19.

[0007] The motor having such a configuration is a motor 1
In the state where the rotary drum 5 is rotated in the direction of the arrow in FIG. As a result, a certain amount of old sand is continuously supplied to the central portion of the circular bottom plate 5A of the rotary drum 5 from the dropout opening 4. The supplied used sand is moved outward by the centrifugal force of the rotary drum 5 and is further accumulated while being pressed against the inner surface of the inclined peripheral wall 5B by the centrifugal force to increase the thickness thereof to form the sand layer S. When the thickness of the old layer S becomes thicker than the gap between the inclined peripheral wall 5B and the roller 14.14, the roller 14.14 starts rotating due to the frictional force with the old sand. As the time further elapses, the sand layer S further increases in thickness and climbs over the weir 5C. After that, weir 5C
Is kept constant at a thickness approximately equal to the width of

In this state, the sand layer S rotates together with the rotary drum 5 and reaches the position of the roller 14.14.
4 and the rotating drum 5 are sandwiched between the inclined peripheral walls to receive a certain pressing force and to cause a shearing action inside the sand, whereby the deposits on the surface of the old sand are separated and removed, and the sand is regenerated. Since the sand is regenerated by a shearing action in a state where the sand is pressurized at a constant pressure by the roller 14, the adhered material is efficiently separated and the sand is less crushed. The regenerated sand falls over the weir 5C, falls below the treatment tank T, and is taken out. As described above, the supply of the old sand into the rotary drum 5, the sand regeneration in the rotary drum 5, and the discharge of the sand regeneration are continuously performed, and the old sand is continuously regenerated.

In the above embodiment, the reason why the peripheral wall 5B of the rotary drum 5 is formed as an upwardly sloping inclined surface extending upward and outward is that, when the sand layer S is formed by centrifugal force, the inner diameter of the sedimentary layer becomes smaller toward the lower side due to the influence of gravity. Therefore, the thickness of the sand layer S is made to be constant in the vertical direction, whereby the rollers 14.14 are evenly pressurized, and the sand is more efficiently regenerated. Further, in the embodiment, two rollers 14 are provided, but may be one or three or more. Further, by making the material of the outer peripheral portion of the roller 14.14 a wear member (grinding stone), in addition to the above sand regenerating action, the sand sandwiched between the inclined peripheral wall 5B of the rotary drum 5 and the roller 14.14 is polished. The wear effect of the members is simultaneously received, and the regeneration efficiency can be further improved. Roller 14.14
Since a constant pressure is applied in the direction of the inclined peripheral wall 5B, the old sand can be pressurized at a constant pressure even if there is a slight abrasion or the like, thereby stabilizing the sand regeneration.

[0010]

According to the present invention, as apparent from the above description, the supplied used sand is deposited on the inclined peripheral wall by the centrifugal action of the rotating drum to form a sand layer, and the sand layer is pressed by a roller at a constant pressure. In addition, since sand is regenerated by causing a shearing action, the sand can be regenerated efficiently by minimizing the crushing of the sand. In addition, even if the roller has abrasion, it has various effects, such as the pressure applied to the sand layer can be kept constant.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrows AA in FIG.

FIG. 3 is a cross-sectional view taken along a line BB in FIG.

FIG. 4 is a view taken in the direction of arrows CC in FIG. 3;

[Explanation of symbols]

 3 Sand Supply Shut 4 Sand Dropout 5 Rotary Drum 5A Circular Bottom Plate 5B Inclined Peripheral Wall 5C Weir 14 Roller P Roller Pressing Mechanism S Sand Layer

Continuation of the front page (56) References JP-A-7-88592 (JP, A) Jikken 63-34771 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B22C 5 / 04 B22C 5/02

Claims (1)

(57) [Claims] 1. A sand supply shoe having a dropout opening 4 at its lower end.
And a slanted peripheral wall 5B which is horizontally rotatable below the sand supply shoe 3 and extends obliquely upward and outward from the peripheral end of the circular bottom plate 5A, and extends inward from the upper end of the slanted peripheral wall 5B. A rotating drum 5 to which a weir 5C is connected, one or more rollers 14 arranged at right angles to the inclined peripheral wall 5B in the rotating drum 5 with a slight gap therebetween, and the rollers 14 And a roller pressing mechanism P for pressing the roller 14 in the direction of the inclined peripheral wall 5B with a constant pressure.