JPH09141672A - Device for cleaning vent hole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce costs by enabling a vent hole to be cleaned in a short period of time, and restraining operational environment from getting deteriorated, besides, enabling fine grains as shots to be recovered. SOLUTION: This vent hole cleaning device is to clean the vent hole adapted to allow gas within the mold to escape outwards and includes fine grain blowing out mechanisms 12, 14, 16, 18 for blowing out fine grains having the size incapable of passing through the vent hole, and a fine grain recovering mechanism 15 for recovering fine grains in their collision and bounce on the vent hole and the proximity thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vent hole cleaning device for cleaning a vent hole that allows gas in a mold to escape to the outside.

[0002]

2. Description of the Related Art As a technique related to this, JP-A-2-59163 discloses a method of cleaning high pressure air vents by passing high pressure air through the air vents.

[0003]

However, it is difficult for the above-mentioned cleaning method to effectively remove the adhered substances such as carbides and dust generated by the burning of the resin used as a binder for sand molds and the like. Is. For this reason, it is possible to remove the carbides and the like by shaving the powders and the like by blowing the powders into the vent hole and its vicinity, but the work environment is limited because the powders are scattered around the die. Getting worse. In addition, there is a problem that it is costly because it is almost impossible to collect the powder. Furthermore, the vent plug is removed and washed with an organic solvent, etc., but the vent plug cannot be removed unless the temperature of the mold is lowered, which takes time to remove and reduces productivity. There is. The technical problem of the present invention is to prevent carbides and the like from being efficiently removed by spraying fine particles into a vent hole, and to prevent deterioration of the work environment by preventing the fine particles from scattering around the mold. In addition, the fine particles can be collected to some extent to reduce the cost.

[0004]

The above-mentioned problems can be solved by a vent hole cleaning device having the following features. That is, the invention according to claim 1 is a vent hole cleaning device for cleaning a vent hole for allowing gas in a molding die to escape to the outside, and fine particles for blowing out fine particles of a size that is difficult to pass through the vent hole. It has a blowing mechanism and a fine grain collecting mechanism that collects fine grains blown out by the fine grain blowing mechanism and colliding with the vent hole and its vicinity and bouncing back. Therefore, by spraying fine particles from the inside of the mold opened into the vent hole etc. by the fine particle blowing mechanism, it becomes possible to efficiently remove the carbide etc. adhering to the vent hole etc. The cleaning time of the vent hole is shortened. Further, since the fine particles are used in a size that does not easily pass through the vent hole, the fine particles that collide with the vent hole or the like from the inside of the molding die are less likely to scatter to the outside of the molding die, thus deteriorating the working environment. Can be suppressed. Further, since the fine particles that have collided and bounced off the vent hole or the like can be collected by the fine particle collecting mechanism, the fine particles can be reused, and the cost can be reduced.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] Hereinafter, a venthole cleaning device according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. Here, FIG. 1 is an overall vertical cross-sectional view of the venthole cleaning device according to the present embodiment, and FIG. 2 is a state in which the venthole cleaning device is used for cleaning the venthole. FIG. FIG.
FIG. 4 is a plan view showing a vent hole. The vent hole cleaning device 10 according to the present embodiment is a handy type device for cleaning the exhaust vent hole B (see FIG. 3) provided in the sand core molding die 1. Introducing section 12 for introducing high-pressure air, storage section 14 for storing molding sand used as a shot, mixing section 16 for mixing the molding sand and high-pressure air, and mixed molding sand And a discharge pipe 18 for discharging high pressure air.

The introduction portion 12 is formed in a pistol shape so that an operator can grip it, and a passage 1 through which high-pressure air passes from the grip portion 12h of the pistol to the tubular portion 12f.
2t is formed. A connector 12c to which a high pressure hose (not shown) is connected is provided at the lower end of the grip portion 12h, and a nozzle 12n for discharging air is formed at the tip of the cylindrical portion 12f. Also,
The grip portion 12h is provided with a passage opening / closing button 12b for opening and closing the passage 12t at a position corresponding to a trigger. The passage opening / closing button 12b closes the passage 12t by a spring force when no external force is applied, and an operator can press the passage opening / closing button 12b to open the passage 12t against the spring force. It is like this. Further, a flow rate adjusting valve 12v for adjusting the flow rate of the air passing through the passage 12t is provided between the passage opening / closing button 12b and the tubular portion 12f.

The storage portion 14 is provided with a bottomed cylindrical container 14y for storing foundry sand and a conical lid 14h fixed to the apparatus side, and is provided at the edge of the lid 14h. The container 14y is covered with the lid 1 by the joining cap 14k.
It is attached so that there is no leakage for 4h. The lid 14
A pipe 14p is fixed in the center of h in a state of being passed through in the axial direction, and a base end portion of the pipe 14p is connected to a mixing portion 16 described later. Further, a conduit 15t of a hopper 15 provided around the discharge pipe 18 is connected to the inclined surface of the lid 14h, and the hopper 15
The inside of the container and the inside of the container 14y communicate with each other. Here, as the molding sand, one having a grain size that does not easily pass through the gap bs of the vent hole B is used. That is, the foundry sand corresponds to the fine particles of the present invention.

The mixing portion 16 is a portion for sucking the foundry sand stored in the storage portion 14 and mixing it with high pressure air by making a negative pressure in the chamber 16t, and for forming the chamber 16t. The short pipe 16p is provided. A through hole 16k is formed in the center of the side surface of the short pipe 16p in the radial direction, and the pipe 14p of the storage portion 14 is connected to the through hole 16k. Further, the tubular portion 12f of the introducing portion 12 is inserted and fixed to one end of the short pipe 16p in an airtight state, and the base end portion of the discharge pipe 18 is also airtight at the other end. It is inserted and fixed in the state.

The discharge pipe 18 is a pipe for guiding the molding sand mixed with the high-pressure air in the mixing section 16 in a certain direction and discharging the molding sand. Bent with a curvature. Further, a socket 18s made of heat resistant rubber is attached to the tip of the discharge pipe 18. Further, a projector 19 is attached to the upper portion of the introduction portion 12 in a state in which the tip of the discharge pipe 18 is oriented. That is, the introduction part 12, the storage part 14, the mixing part 16 and the discharge pipe 18 of the vent hole cleaning device 10 function as a fine particle blowing mechanism of the present invention.

Next, the operation of the vent hole cleaning device 10 according to the present embodiment will be described. First, a high pressure hose is connected to the connector 12c of the grip portion 12h of the vent hole cleaning device 10 so that high pressure air can be supplied to the cleaning device 10. Further, the molding sand used as a shot is stored in the container 14y, and the container 14y is attached to the lid 14h by the joining cap 14k. further,
The projector 19 is turned on. In this state, as shown in FIG. 2, the passage opening / closing button 12b is directed from the inside of the mold 1 opened to the vent hole B of the upper mold 2 by directing the tip of the discharge pipe 18 of the vent hole cleaning device 10. Push.

As a result, the vent hole cleaning device 1 is provided.
0 passage 12h is opened, and high pressure air is passed through the passage 12h. Then, the air discharged from the nozzle 12n passes through the central portion of the chamber 16t at a high speed, so that a negative pressure is generated in the vicinity of the side wall of the chamber 16t, and the foundry sand accumulated in the container 14y is piped by the pipe 14p. It is sucked into 16t. Then, the foundry sand that is guided to the chamber 16t and mixed with the high-pressure air is discharged from the discharge pipe 18 and sprayed to the vent hole B of the upper mold 2. Here, the flow rate of the high-pressure air is adjusted by the flow rate adjusting valve 12v so that the velocity of the molding sand discharged from the discharge pipe 18 becomes 5 m / sec to 25 m / sec at the position where it hits the vent hole B.

As described above, since the casting sand collides with the vent hole B at a high speed, adhered substances such as carbides and dusts generated by the burning of the resin can be efficiently removed. Moreover, since the molding sand used as a shot has a grain size that does not easily pass through the gap bs of the vent hole B, the molding sand that collides with the vent hole B or its vicinity from the inside of the mold 1 is the mold. It becomes difficult to scatter to the outside of 1, and deterioration of the work environment can be suppressed. Further, since the vent hole cleaning device 10 is provided with the hopper 15 around the discharge pipe 18, part of the foundry sand that has collided and rebounded against the vent hole B or its vicinity is received by the hopper 15 and is supplied to the conduit 15t. Is again guided into the container 14y.
Therefore, the casting sand can be effectively used and the cost can be reduced. That is, the hopper 15, the conduit 15t and the like correspond to the fine particle collecting mechanism of the present invention.

Further, since the discharge pipe 18 is bent upward with a predetermined curvature, when the tip of the discharge pipe 18 is directed to the vent hole B, it is necessary to incline the vent hole cleaning device 10 largely upward. Workability is improved. Furthermore, since the surface of the foundry sand in the container 14y does not tilt so much, the container 14y is not sucked by the pipe 14p.
There is less foundry sand left in y. Since the socket 18s made of heat-resistant rubber is attached to the tip of the discharge pipe 18, even if the tip of the discharge pipe 18 contacts the molding surface of the mold 1, the molding surface is not damaged. In addition,
In the vent hole cleaning device 10 according to the present embodiment, the molding sand is used as the shot, but the shot is not limited thereto, and for example, plastic particles or the like may be used.

Although the embodiments of the present invention have been described above, the embodiments of the present invention have the following various technical items in addition to the technical items described in the claims. Please note that. (1) In the vent hole cleaning device according to claim 1, the particle spraying mechanism includes a discharge pipe for discharging the particles, and the discharge pipe is curved so as to face upward. A vent hole cleaning device characterized in that Generally, since the vent hole is provided in the upper mold, the work is performed upward. However, since the discharge pipe is curved upward, it is not necessary to tilt the device largely, and workability is improved. (2) In the vent hole cleaning device according to (1), a tubular socket formed of an elastic body is attached to the tip of the discharge pipe, and the vent hole cleaning device is characterized. Even if the tip of the discharge pipe comes into contact with the molding surface of the mold, the molding surface is not damaged.

[0015]

EFFECTS OF THE INVENTION According to the present invention, since fine particles having a size that does not easily pass through the vent hole are sprayed onto the vent hole or the like for cleaning, carbides and the like can be efficiently removed. At the same time, fine particles are less likely to scatter to the outside of the molding die, and the deterioration of the working environment can be suppressed.

[Brief description of the drawings]

FIG. 1 is an overall vertical cross-sectional view of a venthole cleaning device according to an embodiment of the present invention.

FIG. 2 is a view showing how a venthole cleaning device according to an embodiment of the present invention is used to clean a venthole.

FIG. 3 is a plan view showing a vent hole of a mold.

[Explanation of symbols]

 12 introduction part (fine particle blowing mechanism) 14 storage part (fine particle blowing mechanism) 15 hopper (fine particle collecting mechanism) 15t conduit (fine particle collecting mechanism) 16 mixing part (fine particle discharging mechanism) 18 discharge pipe (fine particle discharging mechanism) mechanism)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kikuo Enoki 1 Toyota-cho, Toyota-shi, Aichi Toyota Motor Co., Ltd.

Claims (1)

[Claims] 1. A vent hole cleaning device for cleaning a vent hole for allowing gas in a molding die to escape to the outside, comprising: a fine particle blowing mechanism for blowing fine particles of a size that is difficult to pass through the vent hole; A vent hole cleaning device, comprising: a fine particle collecting mechanism that collects fine particles blown out by a particle blowing mechanism and colliding with and rebounding to the vent hole and its vicinity.