JP2000051997A - Device for supplying molding sand - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sand supplying device, in which a sand blowing port needed to a position correspoding to a sand charging port in various metallic molds can easily be formed while a blowing plate is attached to the lower part of a sand tank. SOLUTION: In a molding sand supplying device for press-supplying molding sand in a sand tank 7 into a metallic mold from a sand blowing port at a blowing plate side through a charging port at the metallic mold side by abutting the sand tank 7 on the metallic mold through the blowing plate 8 fitted to the lower part thereof, a long hole 13 is formed in the blowing plate 8 and a seal member 9 is disposed on the lower surface side of the blowing plate 8. The seal member 9 is composed of a main body plate-like part 9a brought in close contact with the lower surface of the blowing plate 8 and a cyindrical part 9b for blowing the sand integrally projected with the main body plate-like part and closely inserted into the long hole 13 in the blowing plate 8, and the inner part of the cylindrical part 9b for blowing the sand leaves a portion corresponding to the sand charging port at the metallic mold side and a portion except the above portion is closed with a closing plug 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold sand supply apparatus for supplying mold sand into a mold such as a casting core manufacturing apparatus.

[0002]

2. Description of the Related Art Referring to FIGS. 1 and 2, which show an embodiment of the present invention, a mold sand supply hopper 1 is provided above a mold sand supply position a and a mold sand discharge position. A high-pressure air supply device 2 and a mold 3 such as a core manufacturing device for casting are provided vertically, and are reciprocally movable along a guide rail 4 between a mold sand supply position A and a mold sand discharge position B. A sand tank 7 is suspended from a bogie 5 via a fluid pressure cylinder 6, and a blow plate 8
Is installed. Note that a seal member is mounted on the lower surface side of the blow plate 8.

The opening and closing gate 1a at the bottom of the mold sand supply hopper 1 is opened for a predetermined time in the sand tank 7 of the sand supply device at the mold sand supply position A as shown by the phantom line in FIG. Supply mold sand. Next, the sand tank 7 is moved to the mold sand discharge position B as shown by the solid line in the same figure, and then the sand tank 7 is lowered by the fluid pressure cylinder 6. While being in contact with the mold 8, the blow flange 2a of the high-pressure air supply device 2 is lowered and connected to the upper surface opening of the sand tank 7,
The mold sand 10 in the sand tank 7 is blown by the blow plate 8 by high-pressure air pressed into the sand tank 7 from the high-pressure air supply device 2.
Sand inlets 3a, 3b, 3 on the mold 3 side from the mold sand outlet on the side
c, and is supplied into the mold 3.

[0004]

The sand supply device generally has the above construction, but the sand outlet of the blow plate 8 is provided at a position corresponding to the sand inlet of the mold 3. Since the position of the sand inlet differs depending on the mold 3 to be used, in the conventional sand feeder, the blow plate 8 is formed with holes for the sand outlet in the production stage of the sand feeder. Instead, the blow plate was attached to the lower part of the sand tank 7 as it was, and the product was delivered and shipped, and the user of the device was left to perform the hole machining of the sand outlet corresponding to the sand inlet of the mold used. In addition, the drilling of the blow plate 8 on the user side was very troublesome. Also, if the mold used changes, the position of the sand outlet also changes, so every time the mold is changed, it is necessary to replace it with a blow plate that matches the mold. In addition, there is a problem that it takes a lot of time to replace the blow plate.

The present invention has been made in view of the above problems, and once a blow plate is attached to a lower portion of a sand tank, the blow plate is attached to the sand inlet of various molds to be used. An object of the present invention is to provide a sand supply device that can easily and easily form a required sand outlet at a corresponding position.

[0006]

According to a first aspect of the present invention, there is provided a sand supply device including a sand tank in which a mold sand is supplied.
Is brought into contact with the mold 3 via a blow plate 8 attached to the lower part thereof, and the mold sand 10 in the sand tank 7 is blown from the blow plate-side sand blow-out port to the mold 3 by a high-pressure air. In the mold sand supply device that was supplied to the inside,
A long hole 13 is formed in the blow plate 8, and a seal member 9 made of heat-resistant rubber is provided on the lower surface side of the blow plate 8, and the seal member 9 is a main body plate portion 9 a that is in close contact with the lower surface of the blow plate 8.
And a sand-blowing tubular portion 9b integrally projecting from the upper surface of the main body plate-shaped portion 9a and closely fitted to the elongated hole 13 of the blow plate 8, and the inside of the sand-blowing tubular portion 9b. The other part is closed except for the part corresponding to the mold-side sand inlet, and the stopper 20 is closed.
It is characterized in that it is closed by.

A second aspect of the present invention is the sand supply device according to the first aspect, wherein the stopper 20 is formed of heat-resistant rubber.

According to a third aspect of the present invention, in the mold sand supply device according to the first or second aspect, a metal blow nozzle 21 is provided at a portion corresponding to the sand inlet of the mold 3 in the sand blowing tubular portion 9b. It is characterized in that it is adapted to be inserted.

According to a fourth aspect of the present invention, in the mold sand supply device according to the first or second aspect, the inside of the sand blowing tubular portion 9b is
Engaging concave step portions 14 are provided on both sides of the opening on the lower surface side of the main body plate portion 9a,
The opening 14 is formed in an inverted T-shape in cross section by the formation of the stopper 14, and the stopper 20 is engaged with the stopper main body 22 and the both engaging concave steps 14, 14 protruding from both lower ends thereof. It is characterized in that the two side flange portions 23, 23 are formed in an inverted T-shaped cross section corresponding to the internal opening cross section of the sand blowing tubular portion 9b.

According to a fifth aspect of the present invention, there is provided the mold sand supply device according to the third aspect, wherein the interior of the sand blowing tubular portion 9b is provided with engaging concave steps 14, 14 on both sides of the lower surface side opening of the main body plate 9a. Is formed, an opening is formed in an inverted T-shape in cross section,
The blow nozzle 21 is integrally provided with a rectangular cylindrical main body 24 at both lower end portions thereof so as to protrude therefrom.
And four flange portions 25, 25 that engage with the first and second flanges 4.

[0011]

FIG. 1 is a partially sectional side view schematically showing a sand supply apparatus according to the present invention, and FIG. 2 is a partially sectional front view of the sand supply apparatus. As described. 3 to 5 are partially enlarged views of FIG. 2 and show the detailed structure of the blow plate 8 attached to the lower part of the sand tank 7 and the seal member 9 arranged on the lower surface side of the blow plate 8. FIG. 7 shows the blow plate 8 removed from the sand tank 7 and the seal member 9 attached to the lower surface of the blow plate 8.
FIG. 8 is a perspective view of the blow plate 8 and the seal member 9 viewed from below in a state where the blow plate 8 and the seal member 9 are separated from each other. FIGS. 10A to 10C are a side view, a bottom view, and a cross-sectional view of the seal member 9. The sealing member 9 is used to prevent the mold sand 10 from blowing out from between the blow plate 8 and the mold 3 to the outside when the mold sand 10 is supplied from the sand tank 7 into the mold 3 to deteriorate the working environment. Things.

As can be seen from these drawings, the blow plate 8 has a blow plate main body 8a formed in a rectangular thick plate shape in a plan view, and a pair of holding members abutting on the lower surface of the blow plate main body 8a. Blow plate main body 8a by rails 11
It is divided and formed by a lower plate 8b fixed to the lower surface in close contact. The lower plate 8b has both side surfaces formed on the slopes a, a, and both holding rails 1 fitted into the fitting grooves c, c on the lower surface of the blow plate body 8a and fixed with bolts 12 (see FIG. 8).
1, 1 and 11, the opposing inner surfaces are formed on slopes b and b corresponding to the slopes a and a of the lower plate 8b.
The two slopes a, a are the slopes b,
It is fixed by being pushed and pressed by wedge engagement with b. Further, the upper surface of the blow plate body 8a is brought into contact with the lower surface of the sand tank 7 and is bolted (not shown). The blow plate 8 may be integrally formed of one plate material without being divided and formed by the blow plate main body 8a and the lower plate 8b.

FIGS. 3 to 5 and FIG.
As shown in FIG. 2, a long hole 13 extending in the longitudinal direction is formed in the center in the width direction so as to extend through the blow plate 8 and the lower plate 8b. The seal member 9 is integrally formed of heat-resistant rubber, for example, silicone rubber. As can be seen from FIGS. 3, 8, and 10, the main body plate-shaped portion is in close contact with the lower surface of the lower plate 8b of the blow plate 8. 9a and a sand-blowing tubular portion 9b integrally projecting from the upper surface of the main body plate-shaped portion 9a and closely fitted to the elongated hole 13 of the blow plate 8. Is formed in an inverted T-shape in cross section by forming engagement recessed steps 14, 14 on both sides of the opening on the lower surface side of the main body plate portion 9a, and the upper end of the sand blowing tubular portion 9b. The outer peripheral edge 15 is formed in a slope shape.

In order to attach the seal member 9 to the lower surface side of the blow plate 8, the sand blowing tubular portion 9 b of the seal member 9 is attached as shown in FIG.
As shown in FIG. 7, the lower plate 8b may be inserted into the elongated hole 13 from below and closely fitted, and the main body plate-shaped portion 9a may be brought into contact with the lower surface of the lower plate 8b. The main body plate portion 9a of the seal member 9 is
When the sand tank 7 is pressed against the upper end surface of the mold 3, the sand tank 7 comes into close contact with the lower surface of the lower plate 8 b of the blow plate 8.

A recess 16 is provided on the upper surface of the blow plate body 8a.
In the recess 16, a sand receiving plate (shielding plate) 17 that covers the upper end opening of the long hole 13 is provided at a suitable height from the bottom surface of the recess 16. . As shown in FIGS. 3 to 5 and 7, the sand receiving plate 17 is inserted into the four corners of the sand receiving plate 17 and screwed into the bottom surface of the recess 16, and is externally fitted to the bolt 18. The ring-shaped collar 19 is fixed at a fixed height from the bottom surface of the recess 16. At this time, a gap of about 1 mm is formed between the lower surface of the sand receiving plate 17 and the upper end of the sand blowing tubular portion 9b of the seal member 9 tightly fitted in the long hole 13.

As shown in FIG. 1 and FIG.
The sand inlet 3 of the mold 3 is provided inside the
a, 3b, and 3c except for the other portions, which are closed by the stopper 20 and the sand inlet 3
Metal blow nozzles 21 are fitted into portions corresponding to a, 3b, and 3c, respectively, and the blow nozzles 21 serve as sand outlets for the mold sand 10.

As shown in FIG. 9, the closing plug 20 is engaged with the plug main body 22 and the concave recessed portions 14, 14 of the sand blowing tubular portion 9b projecting from both lower ends thereof. The pair of flange portions 23 on both sides makes the sand blowing tubular portion 9b.
Are formed in an inverted T-shape in cross-section corresponding to the internal opening cross-sectional shape of. As shown in FIG. 6A, the stopper 20 is made of heat-resistant rubber, for example, silicone rubber, and has a cross section T
A long stopper plug forming material 20M integrally formed in a character shape,
By cutting with a cutter according to the length of the sand inlet of the mold 3 to be used, the required length of the closing plugs 20a to 20a
c can be obtained. The stopper 20 may be formed of a metal material, ceramic, or the like.

As shown in FIG. 4, the closing plug 20 is configured such that the plug main body 22 is formed from below the sealing member 9 by the sand blowing cylindrical portion 9 b.
By fitting the two flanges 23 and 23 into the engagement recessed steps 14 of the sand-blowing tubular part 9b, they can be easily attached. At this time,
As shown in FIG. 4, the upper end of the plug body 22 is in close contact with the lower surface of the sand receiving plate 17. In this case, the flange portions 23 and 2 of the stopper 20
3 engages with the engaging concave steps 14, 14 of the sand blowing tubular portion 9b, so that the positioning is easy, and the closing plug 20 can be easily and reliably attached.

The blow nozzle 21 is formed by pressing and welding a steel plate, and as shown in FIG. 6B, a rectangular cylindrical body 24 and a lower end of the rectangular cylindrical body 24. A pair of flange portions 25, which are integrally protruded on both sides of the
25. FIG. 6B illustrates, for example, three types of blow nozzles 21a to 21c having different lengths. As shown in FIG. 5, the blow nozzle 21 is configured such that the square tubular main body 24 is
b, the flange portions 25, 25 may be engaged with the engaging concave step portions 14, 14 of the sand blowing tubular portion 9b. At this time, the blow nozzle 21 does not come off because the square tubular main body 24 is closely fitted to the sand blowing tubular portion 9 b of the seal member 9. Further, as can be seen from FIG. 5, the tip of the rectangular tubular main body 24 is sufficiently lower than the upper end position of the sand blowing tubular portion 9b.

The blow nozzle 21 does not necessarily need to be inserted into a portion of the cylindrical member 9b for sand blowing of the seal member 9 corresponding to the sand inlets 3a, 3b, 3c of the mold 3. However, in the case where the use of this blow nozzle 21 may cause the upper end opening of the cylindrical portion 9b for sand blowing to be deformed so as to narrow the opening by high-pressure air from the sand tank 7 side, such a case may occur. Deformation can be prevented.

In the sand supply device configured as described above, when the sand supply device is used, the sand inlets 3a, 3 of the mold 3 are inserted into the sand blowing tubular portion 9b of the sealing member 9.
The plugs 20 are inserted into the remaining portions except for portions corresponding to b and 3c, and the plugs 20 are closed, so that the mold-side sand inlets 3a, 3b and 3c in the tubular portion 9b for sand blowing.
(A portion not closed by the stopper 20) can be used as a sand outlet of the mold sand 10.

In this case, as shown in FIG. 6 (A), the closing plug 20 is made of a long closing plug forming material 20M integrally formed in a T-shape in cross section with heat resistant rubber such as silicon. Since it can be formed by cutting to a required length according to the length of the sand inlet of the mold 3 to be used, the cost of the stopper 20 itself is low, and the positions of the sand inlets are variously different.
Can be quickly and easily responded to. Also, the blow nozzle 21 is inserted into the sand outlet, that is, the portion (the portion not closed by the closing plug 20) corresponding to the mold-side sand inlets 3a, 3b, 3c in the sand blowing tubular portion 9b. Accordingly, deformation of the sand blowing tubular portion 9b can be prevented.

Therefore, once the blow plate 8 and the seal member 9 are attached to the lower part of the sand tank 7, it is necessary to replace the blow plate 8 and the seal member 9 even if the mold 3 for supplying the mold sand 10 is variously changed. Since no extra work is required, the work is simplified, and the blower plate 8 and the seal member 9 may be provided one by one in the sand supply device, so that the equipment cost is very low.

[0024]

According to the first aspect of the present invention, when the sand supply device is used, a portion corresponding to the mold-side sand inlet in the sand-blowing cylindrical portion of the seal member is left, and the other portions are removed. By closing with a stopper, the part not closed by the stopper in the cylindrical portion for sand blowing is made to serve as a sand outlet for the mold sand. It is not necessary to perform a drilling process on the blow plate and the seal member, so that the work of replacing the blow plate and the seal member is omitted, and the cost is reduced.

Further, once the blow plate and the seal member are attached to the lower portion of the sand tank, even if the mold used is changed and the position of the sand inlet is changed thereafter, the blow plate and the seal member remain in place. Since it is only necessary to insert the required number and length of closure plugs into the sand blow-off tubular part while keeping it attached to the sand tank, the work is much easier and easier than with the conventional equipment, and the equipment The cost is much lower than that of the conventional device.

In the case where the stopper is made of heat-resistant rubber, the stopper is easy to manufacture and the cost is low. If prepared, the cut piece cut in accordance with the length of the mold-side sand inlet can be used as a closing plug, so that a closing plug of a required length can be easily formed.

According to a third aspect of the present invention, a metal blow nozzle is inserted into a portion of the cylindrical portion for sand blowing corresponding to the sand inlet of the mold, that is, a sand blowing outlet, so that the sand blowing can be performed. The cylindrical portion can be prevented from being deformed and can be used in an appropriate state.

According to a fourth aspect of the present invention, both ends of the closing plug are provided on both sides of the plug main body and the lower end of the plug main body so as to engage with both engaging concave steps of the sand blowing tubular portion. If the cross section is formed into an inverted T-shape corresponding to the cross-sectional shape of the internal opening of the cylindrical portion for sand blowing, the flange portion of the stopper plug engages with the engaging concave step of the cylindrical portion for sand blowing. Therefore, positioning at the time of attaching the stopper is easy, and attachment of the stopper can be performed easily and reliably.

According to a fifth aspect of the present invention, a blow nozzle is provided on both sides of the rectangular cylindrical main body and both engaging concave steps of the sand blowing cylindrical section, which are integrally protruded from both lower ends thereof. By forming with the both side flange parts which match, positioning at the time of mounting the blow nozzle is easy, and mounting of the stopper can be performed easily and reliably.

[Brief description of the drawings]

FIG. 1 is a partially sectional side view schematically showing a sand supply device according to the present invention.

FIG. 2 is a partial cross-sectional front view of the sand supply device shown in FIG.

FIG. 3 is a partially enlarged view of the sand supply device shown in FIG.

4 is a partially enlarged view of the sand supply device shown in FIG. 2, showing a state in which a closing plug is inserted into a sand blowing tubular portion of a seal member.

FIG. 5 is a partially enlarged view of the sand supply device shown in FIG. 2, showing a state in which a blow nozzle is inserted into a sand blowing tubular portion of a seal member.

FIG. 6A is a perspective view showing a long stopper plug forming material integrally formed in a T-shape in cross section, and FIG. 6B is a perspective view showing a plurality of blow nozzles.

FIG. 7 is a perspective view of the blow plate and a seal member attached to the lower surface of the blow plate when viewed from the upper surface side of the blow plate.

FIG. 8 is a perspective view of the blow plate and the seal member as viewed from below in a separated state.

FIG. 9 is a perspective view showing a state in which a stopper and a blow nozzle are about to be inserted into a sand blowing tubular portion of the seal member attached to the blow plate.

10A is a side view of a seal member, FIG. 10B is a bottom view thereof, and FIG. 10C is a transverse sectional view thereof.

[Explanation of symbols]

 Reference Signs List 7 sand tank 8 blow plate 8a blow plate main body 8b lower plate 9 sealing member 9a main body plate portion 9b sand blowing cylindrical portion 10 long hole 20 closing plug 21 blow nozzle 22 plug main body 23 flange portion 24 square cylindrical main body 25 flange Department

Claims (5)

[Claims] 1. A sand tank in which mold sand is supplied is brought into contact with a mold via a blow plate attached to a lower part thereof.
In a mold sand supply device in which the mold sand in the sand tank is supplied from the blow plate side sand blowout port to the mold through the mold side sand inlet by high pressure air, a long hole is formed in the blow plate, A seal member made of heat-resistant rubber is disposed on the lower surface side of the blow plate, and the seal member is provided integrally with the lower surface of the blow plate, and is integrally protruded from the upper surface side of the blow plate to form a blow plate. And a cylindrical part for sand blow-off that is closely fitted to the long hole. The inside of the cylindrical part for sand blow-off is closed with a stopper except for the part corresponding to the mold-side sand inlet. Mold sand supply device that is to be used. 2. The sand supply device according to claim 1, wherein said stopper is formed of heat-resistant rubber. 3. The mold sand supply device according to claim 1, wherein a metal blow nozzle is inserted into a portion corresponding to the sand inlet of the mold in the sand blowing tubular portion. . 4. The inside of the cylindrical portion for sand blowing is formed with an inverted T-shaped cross section by forming engagement concave steps on both sides of an opening on the lower surface side of the main body plate portion. The stopper is
A plug body and two side flanges projecting from both sides of a lower end of the stopper body and engaging with the both engaging concave steps form a cross-sectional inverted T-shape corresponding to the internal opening cross-sectional shape of the sand blowing tubular portion. The mold sand supply device according to claim 1 or 2, wherein the mold sand supply device is formed in the mold sand supply device. 5. The inside of the sand blowing tubular portion is formed with an inverted T-shaped cross section by forming engagement concave steps on both sides of the lower opening of the main body plate portion. 4. The mold sand supply device according to claim 3, wherein the nozzle comprises a rectangular tubular main body, and both side flanges integrally projecting from both sides of a lower end of the main body and engaging with the both engaging concave steps.