JP2001219243A - Casting sand carrying apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent any defective action of a conveyor in a casting sand carrying apparatus, to wipe out any fear of the clogging, and to reduce the size of the whole apparatus. SOLUTION: This apparatus carries the lump casting sand and the casting sand containing flashs. A screw conveyor 21 to carry the lump casting sand and the casting sand containing flashs, and a crusher 22 to pulverize the lump casting sand and the casting sand containing flashs are provided concentrically with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for conveying foundry sand.

[0002]

2. Description of the Related Art Casting sand recovered after the completion of a casting operation generally includes massive casting sand and casting burrs, but must be conveyed to a predetermined place by a conveying device such as a screw conveyor. . At this time, the massive foundry sand and foundry burrs are crushed by a crusher and then fed into a screw conveyor.

FIG. 6 shows a schematic configuration of a conventional transport apparatus of this type. Here, reference numeral 1 denotes a horizontal screw conveyor, which can transport molding sand toward an air transport device (not shown). A hopper 2 is provided at the start end of the screw conveyor 1, and a screen 3 is provided on the hopper 2. The screen 3 is led to a crusher 4, which is connected to the screw conveyor 1.

[0004] In such a configuration, the hopper 2 is supplied with molding sand 5 including massive molding sand and molding burrs. Fine objects 6 such as normal-grained sand contained in the foundry sand 5 pass through the screen 3 and are fed into the start end of the screw conveyor 1. Rough material 7 such as massive foundry sand and foundry burrs contained in foundry sand 5 does not pass through screen 3 but is sieved by screen 3 and supplied to crusher 4 where it is finely crushed. The crushed and fine material 8 is similarly fed into the screw conveyor 1 and transported.

[0005]

However, in such a conventional configuration, the screw conveyor 1 has only the ability to convey fine particles, and there is a large amount of molding sand or casting burrs that have failed to separate on the screen 3. When the screw conveyor 1 enters the screw conveyor 1, the screw conveyor may malfunction. Further, since the screen 3 is employed, daily maintenance for clogging or the like is required. Furthermore, since it is necessary to install a screen 3 and a crusher 4 in addition to the screw conveyor 1,
The size of the entire apparatus is increased, and installation costs and maintenance costs are increased.

In view of the above, the present invention solves such a problem, and in a casting sand transporting device, it is possible to prevent a malfunction of a conveyor, to eliminate concerns such as clogging, and to make the entire device compact. The purpose is to be.

[0007]

SUMMARY OF THE INVENTION In order to achieve this object, the present invention relates to an apparatus for transporting bulk molding sand or molding sand containing molding burrs. And a crusher for crushing the massive casting sand and casting burrs are provided coaxially.

[0008] With such a configuration, the screw conveyor has the ability to convey a lump of foundry sand and foundry sand including foundry burrs, and therefore, malfunctions caused by such a lumped foundry sand and foundry burrs may occur. In addition, it is possible to put molding sand including molding burrs and casting burrs into the screw conveyor as it is, eliminating the need for sieving using a screen, eliminating the need for daily maintenance for clogging, etc. Since a crusher for crushing sand and casting burrs is merely provided coaxially with the screw conveyor, the entire apparatus is configured in a smaller size than a screen and a crusher provided separately from the screw conveyor.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 11 denotes a cylindrical casing which is arranged in a horizontal direction. A shaft 12 is provided concentrically inside the casing 11, and the shaft 12 is rotatably supported by bearings 13 at both ends of the casing 11. One end 14 of the shaft 12 protrudes from the casing 11, and the one end 14 is provided with a power transmission sprocket 15 for driving the shaft 12 to rotate. Inside the casing 11, near the bearings 13 on one end side and the other end side, a partition wall 1 is provided, respectively.
6 and 16 are provided. The shaft 12 is provided with each partition 16
And a gland packing 17 is provided in the penetrating portion so that the inside of the casing 11 between the partition walls 16 can be sealed.

At one end of the casing 11, an upward inlet 18 is formed, and at the other end of the casing 11, a downward outlet 19 is formed. A screw blade 20 is fixed to the outer periphery of the shaft 12 over a certain range from a position corresponding to the charging port 18, thereby forming a screw conveyor 21. The screw conveyor 21 is capable of conveying the articles input into the casing 11 from the input port 18 toward the output port 19 as the shaft 12 rotates. Screw blade 20
Is configured to have such a strength that the casting sand can be transported without any trouble even if lump casting sand or casting burrs are mixed.

A crusher 22 is provided coaxially with the screw conveyor 21 at a position closer to the discharge port 19 than the screw conveyor 21 inside the casing 11. In the portion of the casing 11 constituting the crusher 22, a thick annular body 23 is provided in a replaceable state in place of the thin member constituting the casing 11. And on the inner periphery of this annular body 23,
A plurality of fixed blades 24 are provided.

More specifically, as shown in FIGS. 2 and 3,
The fixed blade 24 is formed in a rectangular plate shape, and is formed integrally with the annular body 23 in a state of protruding radially inward from the annular body 23. A plurality of fixed blades 24 are provided at a distance from each other in the circumferential direction, and rows of the plurality of fixed blades 24 are provided at a plurality of positions spaced apart in the axial direction. ing. The fixed blades 24 adjacent to each other in the axial direction are arranged so that their positions in the circumferential direction are shifted from each other.

In FIG. 1, a plurality of rotary blades 25 that rotate integrally with the shaft 12 are provided on a portion of the shaft 12 that constitutes the crusher 22. As shown in FIGS. 4 and 5, the rotary blade 25
Ring 26 rotatably and interchangeably fitted with
The ring 26 projects radially outward from the ring 26.
And are integrally formed. The rotary blade 25 is formed in a rectangular plate shape, and is formed at a plurality of positions along the circumferential direction of the ring 26 at a distance from each other in the circumferential direction. A row of the plurality of rotary blades 25 is provided at a plurality of positions spaced apart in the axial direction. The rotary blades 25 adjacent to each other in the axial direction are arranged so that their positions in the circumferential direction are shifted from each other.

As shown in FIG. 1, in the crusher 22, the inner diameter of the row of fixed blades 24 is formed smaller than the outer diameter of the row of rotary blades 25. The row of fixed blades 24 and the row of rotary blades 25 are provided at a distance from each other in the axial direction. Outlet 19 in shaft 12
An outer flange 27 is provided at a portion closer to the partition 16 than the outer flange 27.

In such a configuration, when driving,
The shaft 12 is rotated to feed the screw conveyor 21 from the inlet 18 to the outlet 19. When the foundry sand is conveyed, the foundry sand is thrown into the inside of the casing 11 from the inlet 18. The fed foundry sand is conveyed by the screw conveyor 21 toward the outlet 19, By being pushed by the subsequent foundry sand, it passes through the position of the crusher 22 and the outlet 19
Is discharged to the outside.

Even when the foundry sand contains a lump of foundry sand, foundry burrs, etc., the foundry sand is introduced through the inlet 18. Then, even if lump casting sand or casting burrs are mixed in the casting sand, the screw conveyor 2
0 is configured to have such a strength that it can be transported without any trouble. Therefore, these massive casting sands and casting burrs are transported toward the crusher 22 without causing problems such as malfunction. In the crusher 22, such massive casting sand and casting burrs are finely crushed by the fixed blade 24 and the rotary blade 25. The crushed and fine material is discharged from the discharge port 19 together with the original molding sand while being guided by the outer flange 27.

Therefore, even when the foundry sand contains massive foundry sand, foundry burrs, etc., the massive foundry sand, foundry burrs, etc. can be introduced into the screw conveyor 21 without being separated from the foundry sand. There is no need to install a screen or the like for separation, and there is no need to perform daily maintenance for clogging and the like. In addition, since the crusher 22 for crushing massive casting sand or casting burrs is merely provided coaxially with the screw conveyor 21, the entire apparatus is compared with a screen and a crusher provided separately from the screw conveyor. It can be made small.

The fixed blade 2 of the crusher 22
4 and the rotary blade 25 can be easily replaced as described above when the wear or damage has occurred.

[0019]

As described above, according to the present invention, there is provided an apparatus for transporting a lump of foundry sand or foundry burrs containing foundry burrs. Since the conveyor and the crusher for crushing the bulk molding sand and the molding burrs are provided coaxially, the screw conveyor has the ability to transport the molding sand including the massive molding sand and the molding burrs. There is no malfunction due to burrs, and massive molding sand and molding sand containing molding burrs can be directly fed into the screw conveyor, eliminating the need for sieving using a screen. No maintenance is required, and a crusher for crushing massive casting sand and casting burrs is provided coaxially with the screw conveyor. Since there is only, the entire apparatus compared to screens and crushers to that provided by the screw conveyor and separate may be configured compact.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a molding sand conveying device according to an embodiment of the present invention.

FIG. 2 is a side view of a fixed blade of the crusher in FIG.

FIG. 3 is a perspective view of the fixed blade of FIG. 2;

FIG. 4 is a side view of the rotary blade in FIG. 1;

FIG. 5 is a perspective view of the rotary blade of FIG. 4;

FIG. 6 is a schematic configuration diagram of a conventional molding sand transport device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Casing 12 Shaft 18 Inlet 19 Outlet 21 Screw conveyor 22 Crusher

Continued on the front page (72) Inventor Yasumasa Tsuda 2-16-1, Sakaemachi, Funabashi-shi, Chiba F-term in Kubota Funabashi Plant (reference) 4D065 CA16 CB07 DD16 DD18 EB02 EB03 EC07 ED03 4E094 CC61 CC71

Claims (1)

[Claims] An apparatus for conveying molding sand including foundry sand and foundry burrs, comprising: a screw conveyor capable of conveying said foundry sand and foundry sand including foundry burrs; And a crusher for crushing casting burrs.