DEVICE FOR REMOVING SAND BY VIBRATION

Abstract

A device for removing sand from a work by vibration which vibrates a molding (work) molded by casting such as an auto part to thereby remove core sand remaining on a hollow portion of the work and in which the work is held against a vibration plate and the vibration plate is vibrated with a single vibration motor to remove the sand.

Description

TECHNICAL FIELD

The present invention relates to a device for removing sand from a molding (work) by vibration which vibrates a molding (work) molded by casting such as an auto part to thereby remove sand remaining on the work, in particular, core sand remaining on a hollow portion of the work. More particularly, it relates to a device for removing sand from a work by vibration which holds a work that is to have sand removed against a vibration plate, and vibrates the vibration plate by means of a single vibration motor, thereby removing sand remaining on the work.

BACKGROUND ART

Many of various machine parts such as auto parts are molded by casting. On moldings (works) produced by casting, a large amount of sand remains. Accordingly, operation for removal of the remaining sand is required.

As methods for removing sand from a work, techniques have heretofore been known which comprise striking a work with sand remaining thereon by means of a hammer to vibrate the work, thereby removing the sand. For example, there have been known a device for removal of sand from a work by holding a work in a sealed box and striking the work with a hammer (Japanese Utility Model Registration No. 3077681), a device for reversion mode removal of sand from a work by reversing a work holding table to turn a feeder head portion of a work down and striking the work with a hammer (Japanese Laid-Open Patent Publication No. 2003-305559), and a hammering device provided with a work-side soundproofing box and a hammer-side soundproofing box to define a sealed room in which a work is struck with a hammer (Japanese Patent No. 3205897).

However, each of these devices is of a type which removes sand remaining on a work by striking the work with a hammer, and accordingly, has not only a problem that its size is large but also environmental pollution problems of noise and scattering of sand which are caused by the hammering.

Further, there has been disclosed in a patent application filed by the present inventor a device which vibrates a work by means of a pair of vibration motors to remove sand, in particular, core sand in a hollow portion of the work by the vibration force (Japanese Patent Application No. 2004-243118).

Since the device uses two vibration motors, it is excellent in sand removing effect by vibration. However, it has a drawback that it is large-sized and economically disadvantageous because of the use of the two vibration motors. Further, when two motors are used, the two motors should rotate synchronously. Accordingly, it is necessary to precisely set proportions of weights of the two motors and positions of elastic support members.

Patent Document 1: Japanese Utility Model Registration No. 3077681

Patent Document 2: Japanese Laid-Open Patent Publication No. 2003-305559

Patent Document 3: Japanese Patent No. 3205897

Patent Document 4: Japanese Patent Application No. 2004-243118

DISCLOSURE OF INVENTION

Problem to be Solved by the Invention

The problem to be solved by the present invention is to provide a device for removing sand by vibration which effects removal of sand from a work by vibrating the work characteristically using a single vibration motor instead of a conventional technique for removing sand by striking a work with a hammer, thereby realizing, as a matter of course, size reduction, and being capable of eliminating noise caused by hammering and of preventing environmental pollution due to scattering sand caused by the hammering and further capable of solving the problems inherent in cases where two motors are used, and accordingly, which is so improved as to be capable of solving the drawbacks inherent in the conventional techniques.

Means to Solve the Problem

To solve the above-described problem, according to the present invention, there is provided a device for removing sand from a molding by vibration which removes sand remaining on the molding by vibration, the device for removing sand by vibration comprising:

• • a base;
  • a vibration plate mounted on the base via elastic support members;
  • a molding holder provided on the vibration plate; and
  • a single vibration motor connected to the vibration plate;
  • wherein the molding which is to have sand removed is held with the holder, and the vibration motor is then actuated to vibrate the vibration plate, thereby applying vibration to the molding held with the holder to remove the sand from the molding.

EFFECT OF THE INVENTION

The above-described present invention is so constructed that a work which is to have sand removed is held against a vibration plate, and the vibration plate is vibrated by means of a single vibration motor to thereby remove sand remaining on the work, in particular, core sand in a hollow portion. Accordingly, the device of the present invention requires no large constituent such as a hammering chamber in a conventional technique and thus enables size reduction to be realized, and is free from noise caused by hammering, and causes no environmental pollution due to scattering of sand.

Further, since the device of the present invention is provided with the only one vibration motor, it enables size reduction to be realized and is economically advantageous. In a case where a sand removing device uses two motors, the two motors are required to rotate synchronously, and accordingly, it is necessary to precisely set proportions of weights of the two motors and positions of elastic support members. However, the device provided with the single motor is free from such a restriction.

BEST MODE FOR CARRYING OUT THE INVENTION

In the following, the present invention will be described with reference to the accompanying drawings. FIG. 1 is a plan view of an embodiment of the device for removing sand by vibration according to the present invention. FIG. 2 is a side view of the embodiment of the device. FIG. 3 is a perspective view of the embodiment of the device.

As shown in FIGS. 1, 2 and 3, the present invention is a device A for removing sand from a molding (work) 1 by vibration which removes core sand in a hollow portion 2 of the molding (work) 1 by vibration, and which comprises a base 3 and a vibration plate 5 mounted thereon via elastic support members 4. On the vibration plate 5, a work holder 6 for holding the molding 1 therebetween is provided. Further, the vibration plate 5 is connected to a single vibration motor 7. As examples of the elastic support members 4, which isolate vibration toward a floor and prevent hindrance of vibration transmission to the vibration plate, there may be mentioned rubber supports, metal springs, pneumatic springs and the like.

In the device A for removing sand by vibration according to the present invention which is constructed as described above, when sand is removed, first, air is discharged from the work holder 6 which inflates with air to deflate the work holder. A clamp rod 9 is thereby retracted through a work clamp guide 8 to provide a space for inserting the work 1, as shown in FIG. 4.

Subsequently, the work 1 is placed in the space formed by the discharge of air, and then air is introduced into the work holder 6 to inflate the work holder, thereby pressing the work 1 with a press means 10 provided at the tip of the clamp rod 9 to hold the work 1 with the work holder 6, as shown in FIG. 5.

After the work 1 is held with the work holder 6 in this manner, the single vibration motor 7 connected to the vibration plate 5 is actuated to vibrate the vibration plate 5, thereby applying vibration to the work 1 to remove sand remaining on the work 1, in particular, core sand in the hollow portion 2. In this connection, in a case where core sand is shaken out of the hollow portion 2, if solid grains are placed in the hollow portion 2 of the work 1, the removal can be effected efficiently.

INDUSTRIAL APPLICABILITY

The above-described present invention is so constructed that a work which is to have sand removed is held against a vibration plate, and the vibration plate is vibrated by means of a single vibration motor to thereby remove sand remaining on the work, in particular, core sand in a hollow portion. Accordingly, the device of the present invention requires no large constituent in a conventional technique such as a hammering chamber and thus enables size reduction to be realized, and is free from noise caused by hammering, and causes no environmental pollution problem due to scattering of sand.

Further, since the device of the present invention is provided with the only one vibration motor for vibrating the vibration plate, it is economically advantageous and has a simplified structure and enables size reduction to be realized. In other words, the device of the present invention is provided with the only one motor. On the other hand, in a case where a sand removing device is provided with two motors, the two motors are required to rotate synchronously, and accordingly, it is necessary to precisely set proportions of weights of the two motors and positions of elastic support members. However, the device provided with the single motor is free from such a restriction. Accordingly, the device for removing sand by vibration according to the present invention has high potential that it will be used widely in the field of casting technique.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a plan view of an embodiment of the device for removing sand by vibration according to the present invention.

FIG. 2 is a side view of the device shown in FIG. 1.

FIG. 3 is a perspective view of the device shown in FIG. 1.

FIG. 4 is an illustrative view showing a state before a work is clamped.

FIG. 5 is an illustrative view showing a state after the work is clamped.

NOTE ON REFERENCE NUMBERS

A: device for removing sand from a molding by vibration

1: work

2: hollow portion

3. base

4. elastic support member

5. vibration plate

6. work holder

7. vibration motor

8. work clamp guide

9. clamp rod

10. pressing means

Claims

1. In a device for removing sand or core sand from moldings or in a hollow portion of the moldings by vibration which removes sand remaining on the molding said device for removing sand by vibration comprising base,a vibration plate mounted on the base made of elastic support members,a molding holder provided on the vibration plate, anda vibration motor directly connected to the vibration plate,wherein the molding which is to have sand to be removed is held with the holder,characterized in that: the vibration motor is a single vibration motor and is actuated to vibrate the vibration plate, thereby applying vibration to the molding held with the holder to remove the sand from the molding.

2. The device for removing sand by vibration according to claim 1, wherein solid grains are placed in the hollow portion of the molding to facilitate the removal of the core sand in the hollow portion.