JPS633658B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sand crusher for crushing used foundry sand in order to recover and regenerate it.

The equipment for crushing used foundry sand into a reusable state must be such that the used foundry sand does not have any hindrance to crushing due to inclusions in the sand.

The apparatus shall be capable of easily and reliably discharging the foreign substances to the outside.

The device must be capable of quantitatively discharging single-particle foundry sand.

The equipment must have a sufficiently large crushing capacity.

The device must not have any parts that are subject to severe wear and tear.

It is required that the device does not further crush single particles.

There are various types of crushing equipment, such as impact type, shot blast type, vibrating hopper type, and rotating horizontal cylinder type, but the first two do not meet the above conditions, and the third type is the vibrating hopper type. Although there is no problem in supplying the sand to be crushed, it is troublesome to take it out and is not practical.

In addition, the fourth rotating horizontal cylindrical device is a device that crushes the sand to be crushed by the rotation of the horizontal cylindrical body, so there is no risk of excessive crushing. The wire mesh is easily torn, resulting in a large time loss for replacement, and there is also a problem with yield.

Based on the above-mentioned viewpoints, the present invention provides a sand crushing device that satisfies all of the above conditions, and has an open part at the center of both end faces, and a large diameter part in the axial center of the peripheral wall. An opening is provided in a part of the peripheral wall of the large diameter part of a drum whose axis is horizontal, and the large diameter part is formed with small diameter parts on both sides, and the opening is connected to an arcuate passage provided along the outer surface of the peripheral wall of the drum. On the other hand, inside the peripheral wall of the drum excluding the opening,
A large number of partition walls each having an L-shaped cross section, each consisting of a radially arranged partition wall part and a rib part parallel to the peripheral wall surface of the drum, are provided protruding in the same direction and at regular intervals, and between the rib parts of the front and rear partition walls, A slit of a predetermined width is formed parallel to the axis, and a plurality of centering blades are provided on the inner circumferential surface of the small diameter portion toward the large diameter portion, and a crushed sand removal chute is provided in one of the open portions. It is distinctive in that the upper end is inserted upward and open.

Next, the apparatus of the present invention will be explained by way of embodiments with reference to the drawings.

FIG. 1 shows an embodiment of the device according to the invention in a longitudinal sectional front view, and FIG. 2 shows a longitudinal sectional side view.
As shown in the drawings, the apparatus of the present invention has a drum 1 having open portions 2 and 3 at the center of both front and rear end surfaces 1a and 1b.

The drum 1 has a large diameter section 4A formed at the center in the axial direction of the peripheral wall 4, and small diameter sections 4B and 4C formed at both front and rear sides of the large diameter section.
A part of A is formed in the opening 5.

The opening 5 communicates with an arcuate passage 6 provided along the outer surface of the large diameter portion 4A.

Inside the large diameter portion 4A, partition wall portions 7A are arranged radially over the entire portion excluding the opening 5.
A large number of partition walls 7 having an L-shaped cross section are provided protruding in the same direction and arranged at regular intervals, and the rib portions 7B of the front and rear partition walls 7, 7 are arranged in parallel with the inner surface 4a of the peripheral wall 4. , 7B to a specified width (for example, 1.5 to 3.0 mm)
It is formed into a slit S parallel to the axis of.

The open part 2 on the front end face 1a of the drum 1 is used as a sand inlet to be crushed, and the open part 3 on the rear end face 1b
From there, insert the upwardly open upper end 8A of the crushed sand removal chute 8 so as to face the partition wall 7,
The crushed sand can be freely taken out to the outside.

A gate 9 is attached to the chute 8 so as to be openable and closable, so that a fixed amount of crushed sand can be discharged.

On the other hand, a residue receiving chute 10 and a receiving box 11 are provided directly below the drum 1, so that the residue protruding from the passage 6 can be collected.

The drum 1 can be rotated forward and backward by a reversible motor 12, and has tires 14, 14 that are in frictional contact with drive rollers 13, 13 rotated by the reversible motor 12.
are fitted onto the outer peripheries of the small diameter portions 4B and 4C.

A required number of triangular centering blades 15 are fixed to the inner surfaces of the front and rear end surfaces 1a and 1b, which are the circumferential portions of the open portions 2 and 3 of the drum 1.

The center blade 15 has a triangular end surface, and the drum 1
The end surface 15a facing the axis of the drum 1 is a closed surface, and the opposite end surface is brought into close contact with the inner peripheral surfaces of the small diameter portions 4B and 4C, so that sand and residue inside the drum 1 are always kept away from the large diameter portion 4A.
It acts so that it gathers.

Next, the operation of the apparatus of the present invention when the drum rotates in the normal direction will be explained with reference to FIGS. 3 and 4. In addition, in the figure,
16 is sand to be crushed, 17 is crushed sand, 18
indicates residue.

When the drum 1, which rotates in the direction of the arrow, receives used foundry sand as the sand to be crushed 16 from the open part 2, it rolls within the large diameter part 4A of the drum 1, and gradually becomes finer until it is large enough to pass through the slit S. At this time, the crushed sand 17 flows into the gap between the partition walls 7, 7.

Since the gap between the partition walls 7 and 7 is open only at the slit S portion, as the rotation of the drum 1 progresses and the slit S eventually becomes downward, the crushed sand falls through the slit S, and the crushed sand is removed from the chute 8. It falls into the upwardly open upper end 8A and is taken out to the outside.

During this time, the uncrushed sand 16 rolls within the drum 1 and gradually becomes finer.

In this way, all of the crushed sand 16 eventually becomes crushed, flows into the gap between the partition walls 7 through the slit S, flows out from the slit S again, passes through the crushed sand takeout chute 8, and enters the gate 9. It is quantitatively taken out to the outside.

By the way, foreign substances mixed in the foundry sand and other substances that are not crushed even if they are rolled in the drum can be removed by reversing the drum 1 as shown in Figs. 5 and 6. , as the residue 18, from the slit S to the rib portion 7B without entering the partition walls 7, 7.
When the opening 5 comes down, it rolls in the drum 1, and when the opening 5 comes down, it enters the passage 6, and as the drum 1 continues to rotate, it rolls in the passage 6 and falls into the chute 10. and is collected in the receiving box 11.

As is clear from the above description, the device of the present invention can automatically take out the used foundry sand charged into the drum while crushing it by rotating the drum. The residue that has been rolling inside the drum without being crushed can be automatically discharged from the passage on the outside of the drum peripheral wall, allowing for highly efficient crushing work.In particular, there are no consumable parts, so it can withstand long-term use. The crushed sand has excellent effects such as being quantitatively taken out to the outside.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the device of the present invention, FIG. 2 is a longitudinal sectional side view, and FIGS.
The figure is a longitudinal sectional front view explaining the action when the drum rotates forward.
5 and 6 are longitudinal sectional front views illustrating the action when the drum is reversed. In the drawings, 1... drum, 1a... front end surface, 1b... rear end surface, 2, 3... open part, 4... peripheral wall, 4A... large diameter part, 4B, 4C... small diameter part, 5... ...opening, 6
...Aisle, 7...Partition wall, 7A...Partition wall section, 7B
...Ribbe, 8...Crushed sand removal chute, 8A...
Upper end portion, 10... Residue receiving chute, 11... Receiving box, 12... Reversible motor, 13... Drive roller, 14... Tire, 15... Centering blade.

Claims (1)

[Claims] 1. One of the peripheral walls of the large diameter part of a drum having an open part at the center of both end faces, the axial center of the peripheral wall being a large diameter part, and both sides of the large diameter part being small diameter parts. An opening is provided in the drum, and the opening communicates with an arcuate passage provided along the outer surface of the peripheral wall of the drum, while the inside of the peripheral wall of the drum excluding the opening is
A large number of partition walls each having an L-shaped cross section, each consisting of a radially arranged partition wall part and a rib part parallel to the peripheral wall surface of the drum, are provided protruding in the same direction and at regular intervals, and between the rib parts of the front and rear partition walls, A slit of a predetermined width is formed parallel to the axis, and a plurality of centering blades are provided on the inner circumferential surface of the small diameter portion toward the large diameter portion, and a crushed sand removal chute is provided in one of the open portions. A sand block crushing device characterized in that an upwardly open upper end of the sand block is inserted.