JPH11276922A - Sand lump cracking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cracking efficiency by providing an outside vessel like a bottomed vessel supported with a spring on a main body frame and an inside vessel mounted with a prescribed gap inside thereof and having many small pores. SOLUTION: When lumpy molding sand is housed in the inside vessel 7 and a vibration motor 15 is rotary-driven, the vibration is transferred to the outside vessel 3 to vibrate the inside vessel 7 and is given to the lumpy molding sand in the vertical direction simultaneously in the peripheral direction. The lumpy sand, to which the vibration is given, collides each other and effectively cracked. Many grooves are provided on the whole surface of the inside vessel 7 and the vibration is effectively transferred to the lumpy sand from the inside vessel 7 by the grooves and the lumpy sand is effectively cracked also by repeating the collision with the edges of the grooves. The finely cracked sand is passed through slits formed on the whole surface of the inside vessel 7 to fall down to the outside vessel 3 side to be housed therein.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sand crushing apparatus for breaking a sand lumps of a self-hardening mold which has been separated after casting into sand grains.

[0002]

2. Description of the Related Art FIGS. 6 and 7 show a conventional sand crusher disclosed in Japanese Patent Application Laid-Open No. 58-46350.
FIG. 6 is a front view, and FIG. 7 is a side sectional view. In the figure,
Reference numeral 31 denotes a bottomed cylindrical frame supported on a base frame 32 via vibration isolating springs 33, 33, and a cylindrical partition plate 34 concentric with the side plate 31a of the frame 31 has a lower end therein. An annular bottom plate portion provided with a predetermined interval from the inner bottom surface 31b of the frame 31 and having a number of small holes 35 formed between the lower end of the partition plate 34 and the side plate 31a of the frame 31. 36.

[0003] Then, a side plate 31a of the frame 31,
The bottom plate portion 36 and the partition plate 34 form a bottomed annular sand mass storage container 37 in the frame 31. Reference numeral 38 denotes a substantially cylindrical support cylinder which stands upright at a substantially central portion of the inner bottom surface 31 b of the frame 31.
The support tube 38 extends upward through a hollow portion 39 surrounded by the support tube 4. A spiral gutter 40 in a right-handed screw direction is fixed to the outer peripheral portion of the support tube 38. The lower end of the gutter 40 is continuous on the inner bottom surface 31b and the upper end 40a
Are slightly projected from the support cylinder 38 in the horizontal direction.

[0004] A supporting cylinder 38 is positioned below an upper end 40 a of a gutter 40 via supporting members 42, 42.
And a sieving device fixed to the frame 31. The sieving device is such that a middle portion of the trough 43 is partitioned by a wire mesh 44 through which only sand particles can pass, and one side of the trough 43 is opened to discharge impurities on the wire mesh 44. In addition, a chute 45 is provided at the bottom so that the sized sand particles can be collected.

A pair of vibration motors 46 and 46 are fixed to the lower outer surface of the frame 31 so as to face each other with a support cylinder 38 at the center of the frame 31 interposed therebetween. Are operated in synchronization with each other.

In the conventional example configured as described above,
When a suitable amount of self-hardening sand is stored in the sand mass storage container 37 and the vibration motors 46 and 46 are driven to rotate, the sand mass input into the sand mass storage container 37 moves up and down, and The agglomerates rub together and loosen and are agglomerated into single or composite sand grains and other impurities.

The agglomerated sand particles, lumps and other impurities pass through the small holes 35 and the inner bottom surface 31 b of the frame 31.
To the frame 31 under the action of torsional vibration.
Is moved to the center of the bottom of the gutter 40 from the entrance at the lower end of the gutter 40 while repeatedly flying or sliding on the gutter 40, and thrown into the sieving device 41 from the upper end 40a.
The sand particles supplied to the sieving device 41 are subjected to the vibrating action, fall through the mesh of the wire netting 44, and are collected via a chute 45 in a collection container (not shown). On the other hand, the impurities that have been put into the sieving apparatus 41 or other impurities cannot pass through the mesh of the wire mesh 44 and are moved to the open end of the trough 43 while being vibrated and discharged to the outside.

[0008]

In the conventional bulking apparatus, small holes 35 are provided only in the bottom plate portion 36 of the sand mass storage container 37. It is discharged only from the small holes 35. As a result, there remains sand that is not discharged while being crushed, and the non-discharged sand moves upward due to vibration again, resulting in a problem that efficiency is poor and sufficient capacity cannot be exhibited.

The crushing is mainly performed by collision or friction between the sands.
Has a problem in that it is cylindrical, cannot effectively collide with sand or give friction to each other, and cannot be efficiently crushed. Further, there is also a problem that large scraps of iron, which do not fall from the small holes, always move in the lump storing container, generating noise and accelerating the wear of the container.

The present invention has been made in order to solve the above problems, and an object of the present invention is to obtain a sand crushing apparatus having a high crushing efficiency. Another object is to obtain a low-noise sand crusher.

[0011]

A sand crushing apparatus according to the present invention comprises an outer container in the form of a bottomed container supported on a main body frame via a spring, and an outer container inside the outer container. It is provided with an inner container provided with a predetermined gap and having a large number of small holes on the entire surface, and a vibration motor for applying vibration to the outer container.

Further, the inner container has a polygonal outer periphery, a corner continuous with each corner of the polygon is formed on the inner surface, and a post having a large number of small holes is provided at the center. It is.

Further, a plurality of grooves are provided in the inner container, and the small holes are arranged in the grooves.

In addition, a concave portion is provided at the bottom of the inner container, and a gate for opening and closing the concave portion is provided.

[0015]

FIG. 1 is a fragmentary front view showing an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a side view. In the figure, reference numeral 1 denotes a main body frame installed on a base, and 3 denotes a bottomed outer container which is installed on the main body frame 1 through a plurality of springs 5. 7 is the outer container 3
Is an octagonal inner container provided on the inner surface with an outer container 3 and a certain gap 6 therebetween. The inner container 7 has an inclined portion 7a inclined from the outer peripheral portion toward the center, a bottom portion 7b provided horizontally and continuously from the inclined portion 7a, and a center provided upright at the center portion of the inner container connected to the bottom portion 7b. And a post 7c.

The inclined portion 7a, the bottom portion 7b, and the post 7c of the inner container 7 are formed by laminating a plurality of flat plates, and a connecting portion of each flat plate has a corner. FIG. 4 is a plan view of a flat plate constituting the inclined portion 7a, and FIG. 5 is a sectional view taken along line AA of FIG. As shown in FIGS. 4 and 5, the flat plate is provided with a plurality of grooves 8, and the grooves 8 are provided with a large number of slits 10 at predetermined intervals. The size of the slit 10 is about 5 to 50 mm in width and 10 to 100 mm in length.
It is about.

The inner container 7 formed from a flat plate as described above has a plurality of grooves 8 and slits 10 on the entire inner surface. Reference numeral 9 denotes a recess provided at one of eight bottoms 7 b of the inner container 7, and a gate 11 is provided at the bottom of the recess 7, and the gate 9 can be opened and closed by a gate opening and closing mechanism 13.

Reference numeral 15 denotes a vibration motor provided at a lower portion of the outer container 3, which vibrates the outer container 3 by rotating the vibration motor 15. Reference numeral 17 denotes a chute provided at the bottom of the outer container 3 for discharging sand dropped from the inner container 7 and accumulated in the outer container 3.

Next, the operation of the present embodiment configured as described above will be described. A massive casting sand is stored in the inner container 7, and the vibration motor 15 is driven to rotate. This vibration is transmitted to the outer container 3 and the inner container 7 installed in the outer container 3 vibrates. When the inner container 7 vibrates, the massive molding sand put therein is vibrated in the vertical direction as well as in the circumferential direction.

The vibrated sand mass moves obliquely upward along the inner peripheral surface of the inside of the container.
Is octagonal and angular, so that the moving direction of the sand mass is changed at this corner and the sand masses collide with each other. By generating the collision between the sand blocks, the sand blocks can be effectively crushed. Also, a number of grooves 8 are provided on the entire surface of the inner container 7,
The grooves 8 effectively transmit vibration from the inner container 7 to the sand chunks, and the sand chunks are also effectively crushed by repeatedly colliding with the corners of the grooves 8. Due to the synergistic effect of the two actions of these corners and grooves 8, the sand mass is more effectively crushed.

The inner container 7 is provided with a large number of slits 10 on the entire surface, and the finely crushed sand immediately passes through the hole and falls to the outer container 3 side. For this reason, the crushed sand does not stay in the inner container, which is extremely efficient. Further, when such a thing as iron scrap is mixed in the sand lump, the iron lump is placed in the recess 9 in a state where the sand lump is separated.
Captured by Then, the captured iron chips do not move even during the vibration, and stop at the recess 9. for that reason,
The movement of the iron swarf does not generate noise or wear the flat plate of the inner container 7.

The sand dropped to the outer container 3 side is vibrated,
It moves to the outer peripheral side and is discharged from the chute 17. When the crushing is completed, the gate 11 is opened by the gate opening mechanism 13, and the iron chips and the like captured in the recess 9 are discharged.

In the above embodiment, an octagonal inner container 7 has been described as an example. However, the present invention is not limited to this, and the number of corners is not particularly limited as long as it is polygonal. Not done.

[0024]

Since the present invention is configured as described above, it has the following effects.

[0025] By providing the inside of the outer container with a gap between the outer container and the outer container and having a large number of small holes on the entire surface, the crushed molding sand can smoothly flow from the small holes of the inner container. Since it comes out to the outer container side, it can be efficiently crushed. Further, since a large number of small holes are provided on the entire surface of the inner container, the friction between the inner container and the sand is large, so that the sand can be efficiently vibrated and the efficiency of crushing can be increased.

Further, the inner container has a polygonal outer periphery, a corner portion continuous with each corner portion of the polygon is formed on the inner surface, and a post having a large number of small holes is provided at the center portion. In addition, the sand can collide with each other at the corners of the inner surface of the inner container, whereby the sand blocks can be effectively crushed.

Further, since a number of grooves are provided in the inner container and the small holes are arranged in the grooves, the friction between the sand mass and the inner surface of the container increases, and the vibration of the inner container can be effectively transmitted to the sand mass. The sand can be effectively crushed by hitting the corner of the groove.

In addition, since a concave portion is provided at the bottom of the inner container and a gate for opening and closing the concave portion is provided, the iron chips are trapped when sand-like materials are mixed in the sand mass. Therefore, it is possible to prevent the noise and the inner container from being worn out due to the movement of the iron scraps during the vibration.

[0029]

[Brief description of the drawings]

FIG. 1 is a side view showing a part of an embodiment of the present invention in a crushed state.

FIG. 2 is a plan view of one embodiment of the present invention.

FIG. 3 is a side view of one embodiment of the present invention.

FIG. 4 is a plan view of the component according to the embodiment of the present invention.

FIG. 5 is a sectional view taken along the line AA of FIG. 4;

FIG. 6 is a side view of a conventional example.

FIG. 7 is a side sectional view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body frame 3 Outer container 5 Spring 7 Inner container 9 Depression

Claims (4)

[Claims] 1. An outer container in the form of a bottomed container supported on a main body frame via a spring, and is provided inside the outer container with a predetermined gap between the outer container and a plurality of small holes on the entire surface. And a vibration motor that applies vibration to the outer container. 2. The inner container has a polygonal outer periphery, a corner continuous with each corner of the polygon formed on the inner surface, and a post having a large number of small holes provided at a central portion. The sand chunk crushing apparatus according to claim 1, wherein: 3. The sand crusher according to claim 1, wherein a number of grooves are provided in said inner container, and said small holes are arranged in said grooves. 4. The sand crushing apparatus according to claim 1, further comprising a concave portion provided on a bottom portion of the inner container, and a gate for opening and closing the concave portion.