JPH07223038A - Device for reconditioning molding sand - Google Patents

Abstract

PURPOSE:To keep an extent of reconditioning of molding stand to a specific range and use consumable parts for a long time by confirming the wear extent of a roller with the loaded ampare of a metal for driving a rotary drum even if the roller gradually wears, shifting the roller in the circular direction of the rotary drum and adjusting gap between the roller and the side wall of the drum. CONSTITUTION:At the time of supplying used sand into a sand supplying chute 3 in the condition of rotating the rotary drum 5 by driving the motor 10, the fixed quantity of the used sand is supplied on around the bottom plate 5A of the rotary drum 5 from gap between an opening part 4 for dropping the sand and a cover member 14. The used sand is moved outerward by centrifugal force of the rotary drum 5 and further, piled up on the inner surface of an inclined peripheral wall 5B while being pushed by the centrifugal force and when this thickness is thicker than the gap between the inclined peripheral wall 5B and the roller 25, the roller 25 starts rotation by friction force with the used sand. Further, with the lapse of time, sand layer S is increased to more thicker and run over a weir 5C. Thereafter, the sand layer is kept to the fixed thickness almost equal to the width of the weir 5C.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, various devices for reclaiming foundry sand have been developed, but in recent years, a rotary roller in a saucer-shaped rotary drum has been developed as a device capable of efficiently reclaiming sand without crushing the sand. Is provided, and the sand reclaiming is realized by pressurizing the old sand by the inner wall surface of the rotating drum and the rotating roller and generating a shearing action. However, in such a foundry sand reclamation device, the rotary roller gradually wears due to friction with old sand, and the degree of regeneration decreases, so that there is a problem that the rotary roller must be replaced when it has worn to some extent. . The present invention has been made in view of the above problems, and an object of the present invention is to provide a foundry sand reclamation apparatus capable of maintaining the degree of sand reclamation within a certain range and enabling long-term use of consumable parts.

[0003]

In order to achieve the above object, a foundry sand reclamation apparatus according to the present invention comprises a sand supply shoe having a sand drop opening at a lower end thereof, and a load below the sand supply shoe. A saucer-shaped rotating drum connected to a motor capable of controlling ampere and horizontally rotatably disposed,
A dolly arranged so as to be capable of reciprocating in a predetermined direction at a central position of the sand supply shoe, a movement adjusting mechanism that is engaged with the dolly and adjusts the movement of the dolly, and is suspended from the dolly. Located at a right angle to the inner wall surface of the rotating drum 1
It is characterized in that it is provided with one or more rollers.

[0004]

According to the present invention, by adopting the above-mentioned solution means, when the sand is regenerated for a long period of time, the roller is worn and the load on the motor of the rotary drum is reduced and the amperage is lowered, the movement adjustment is performed. The mechanism is operated to move the roller along with the carriage in the circumferential direction of the rotating drum to adjust the distance between the side wall of the rotating drum and the roller to set the load ampere to the motor of the rotating drum to a predetermined value. To do so. Therefore, the degree of sand reclamation can be maintained within a certain range and the roller, which is a consumable component, can be used for a long period of time.

[0005]

Embodiments of the present invention will now be described in detail with reference to the drawings. At the upper end portion of the processing tank T in which the pyramidal cylinder portion 2 is connected to the lower portion of the rectangular cylinder portion 1, a sand supply shoe 3 that is bent inward and inclined downward is configured. A sand shedding opening 4 faces the lower end of the grate 3. The sand supply shoe
A saucer-shaped rotary drum 5 is arranged below the boot 3. The rotary drum 5 includes a circular bottom plate 5A and a circular bottom plate 5A.
The slanted peripheral wall 5B extending obliquely upward and outward from the peripheral end and the weir 5C projecting inward from the upper end of the slanted peripheral wall 5B are integrally connected to each other.

A rotary shaft 6 is fixed to the central portion of the lower surface of the circular bottom plate 5A of the rotary drum 5, and the rotary shaft 6 rotates via a bearing 8 mounted on a hollow support frame 7. It is supported freely. At the lower end of the rotary shaft 6, V
A motor 10 having a pulley 9 mounted thereon and mounted on the support frame 7 outside the processing tank T.
Is rotatably connected to the rotary shaft 11 via a V belt 12 and a V pulley 13. The motor 10 can manage the load ampere. Further, a cover member 14 having an inverted U-shaped cross section is fixedly arranged in the center position of the sand supply shoe 3 in the front-rear direction. Mounting frames 15.15 are provided at appropriate intervals, and a collared roller 16.16 is mounted inside the mounting frames 15.15. The collar with collar
A carriage 18 having a cross-section having a bracket 17 fixed to the lower surface thereof is engaged with the rack 16.16, and the carriage 18 can reciprocate in the front-rear direction.

A nut 19 is fixed to a position corresponding to the rear end of the truck 18 in the rectangular tube portion 1. A screw rod 20 is screwed into the nut 19 and the tip of the screw rod 20 is attached to the truck. A rear end of 18 is rotatably connected via a joint (not shown). An operation handle 21 is attached to the rear end of the screw rod 20 so that the carriage 18 can be moved back and forth by rotating the operation handle 21, and the handle 21 is rotated by a lock mechanism (not shown). The movement adjusting mechanism 22 of the carriage 18 is configured as a whole.
A rotary shaft 24.24 is rotatably supported at both left and right ends of the bracket 17 via bearings 23.23, and a slight gap is formed at the lower end of the rotary shaft 24.24 with respect to the inclined peripheral wall 5B. Roller provided and positioned at a right angle 25.
25 is fixed.

The motor constructed as described above is a motor 10
Is driven to rotate the rotary drum 5, and old sand is supplied into the sand supply shoe 3. This allows the sand shedding opening 4
A certain amount of old sand is continuously supplied onto the circular bottom plate 5A of the rotary drum 5 from the gap between the cover member 14 and the cover member 14. The supplied old sand is moved outward by the centrifugal force of the rotating drum 5 and is further accumulated on the inner surface of the inclined peripheral wall 5B while being pressed by the centrifugal force to increase its thickness and form a sand layer S.
When the thickness of the sand layer S becomes thicker than the gap between the inclined peripheral wall 5B and the roller 25.25, the roller 25.25 starts to rotate due to the frictional force with the old sand. When the time further passes, the sand layer S further increases in thickness and crosses 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 when it reaches the position of the roller 25.25, the roller 25.2.
5 and the inclined peripheral wall 5B of the rotary drum 5 receive a large pressing force and a shearing action is generated inside the sand, whereby the deposits on the surface of the old sand are peeled and removed, and the sand is regenerated. Since this sand regeneration is performed by the shearing action under pressure, the sand is regenerated by efficiently removing and removing the deposits in the state where the sand is less crushed. The reclaimed sand goes over the weir 5C, falls below the processing tank T, and is taken out to the outside. If this sand regeneration is performed continuously,
The outer periphery of the roller 25.25 wears and the gap between the roller 25 and the inclined peripheral wall 5B becomes wider. As the gap becomes wider, the load ampere of the motor 10 decreases. When this amperage becomes a certain value or less, the operation handle 21 is operated to move the carriage 18 in the circumferential direction through the movement adjusting mechanism 22 so that the gap between the roller 25.25 and the inclined peripheral wall 5B becomes a predetermined distance. adjust. Roller 25.25 as above
The clearance between the inclined peripheral wall 5B and the inclined peripheral wall 5B is sequentially repeated according to the wear condition of the roller 25.25, so that the degree of sand reclamation can be maintained within a certain range and the roller 25.25.
25 can be used for a long time without replacement. Although the movement adjusting mechanism 22 is rotated by the operation handle 21 in the above embodiment, it may be rotated by a motor or the like.

[0010]

According to the present invention, as is apparent from the above description, even if the rollers are sequentially worn, the degree of this wear is confirmed by the load ampere of the motor for driving the rotary drum, and the rollers are checked. Is moved in the circumferential direction of the rotating drum to adjust the clearance between the roller and the side wall of the drum, which makes it possible to maintain the sand reclamation degree within a certain range and to replace the roller without changing the roller. It is remarkable that it can be used for a certain period of time.

[Brief description of drawings]

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

FIG. 2 is a view on arrow AA in FIG.

3 is a cross-sectional plan view of a main part in FIG.

[Explanation of symbols]

 3 Sand Supply Shoot 4 Sand Removal Opening 5 Rotating Drum 10 Motor 18 Cart 22 Movement Adjustment Mechanism 25 Roller

Claims (1)

[Claims] 1. A sand supply shoe 3 having a sand drop opening 4 at its lower end, and a motor 10 under the sand supply shoe 3 which is capable of managing a load ampere, and horizontally rotatable. The saucer-shaped rotary drum 5 arranged as described above, the carriage 18 arranged so as to be capable of reciprocating in a predetermined direction at the central position of the sand supply shoe 3, and the carriage 18 engaged with the carriage 18. A movement adjusting mechanism 22 for adjusting the movement of the carriage 18,
A casting sand reclaiming apparatus, comprising: one or more rollers 25 suspended from the carriage 18 and positioned at right angles to the inner wall surface of the rotary drum 5.