JP3388125B2 - Molding material filling equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding material filling device for filling powdery or granular molding material into a cavity inside a mold from above in a powder molding press device or the like.

[0002]

2. Description of the Related Art A cavity 5 inside a mold 51 shown in FIG.
In the case of filling the powdery or granular molding material 61 into the upper part 2 from above, a reciprocating molding material filling device 71 shown in the same figure is conventionally used.

That is, first, the mold 51 has a cavity 52.
An outer mold 53, a middle mold 54, a lower mold 55, and an upper mold (not shown) that surround the outer mold 53 are supported by a mounting plate 56 and the like, and a powdery or granular molding material 61 is placed in the cavity 52 from above. A fixed amount is filled, the mold is clamped, and heat melting is performed to form a cylindrical molded product (not shown). The figure shows a state in which the upper mold is lifted and the mold is opened. In this condition, the cavity 52 is filled with the powdery or granular molding material 61 from above.

The filling device 71 includes a support plate 72 installed above the mounting plate 56, a transfer cylinder 73 attached to the support plate 72, and a bottomless box attached to an operating rod 74 of the transfer cylinder 73. And a filling container 75 in the shape of
Repeatedly reciprocates in the horizontal direction in the drawing above the cavity 52, and while the reciprocating motion is repeated, the filling container 75
The molding material 61 therein is allowed to fall freely into the cavity 52.

However, this conventional technique has the following disadvantages.

The reciprocating stroke causes a long filling time. The bulk density varies depending on the reciprocating direction.
That is, since the filling container 75 reciprocates linearly, the molding material 61 is moved along the reciprocating direction as shown in FIG.
Unevenness (uneven filling) occurs, which adversely affects the quality of the molded product. Segregation of the molding material 61 occurs due to the reciprocating motion. That is, when the size of the particles of the molding material 61 is large or small,
Originally, the large particles and the small particles must be mixed as shown in FIG. 5 (A), but as the reciprocating motion is repeated, the large particles and the small particles are vertically moved as shown in FIG. 5 (B). And the quality of the molded product is adversely affected.

[0007]

In view of the above points, the present invention can efficiently fill the molding material in a comparatively short time, thereby improving the productivity and improving the molding material. It is an object of the present invention to provide a molding material filling device capable of preventing segregation or segregation and improving the quality of molded products.

[0008]

In order to achieve the above object, a molding material filling device of the present invention is a device for filling a cavity inside a mold with powdery or granular molding material from above, and is a cone. Container equipped with a sloped surface and a supply port below it, and a stirring blade provided on the outer periphery of the shaft, which is provided with a shaft that rotates in the filling container.
Set below the stirring blade a periphery of the root and the shaft
And a stirring unit having a scraped supply blade ,
In the above, the stirring blade has a rod shape, and
The supply blade has a plate-like shape and is composed of two flat plates.
It was decided to be combined in a clew shape .

A molding material filling device according to a second aspect of the present invention is the molding material filling device according to the first aspect, further comprising a seal portion provided on the lower surface of the filling container and at the opening peripheral edge of the supply port. , The sealing part contacts the upper surface of the mold
Decided to be configured .

The molding material filling apparatus according to claim 1 of the present invention having the above-mentioned structure does not reciprocate during the filling operation, and the stirring unit is stopped above the cavity of the mold in the mold open state. The cavity is filled with the molding material while rotating to agitate the molding material. Therefore, it is possible to efficiently fill the molding material in a relatively short time, and when filling the molding material into the cylindrical cavity,
It is possible to uniformly fill the molding material on the circumference. Further, since it does not reciprocate, segregation of the molding material is less likely to occur.

The molding material slides down along the conical slope in the filling container, falls freely from the supply port provided below the conical slope into the cavity, and is concentrated in the supply port in the process of rod-shaped stirring. Stirred by blades, plate-shaped and 2
It is sprinkled by a supply blade having a combination of flat plates in a screw shape .

[0012] In addition, as in the molding material filling apparatus according to claim 2 of the present invention provided with the structure mentioned above, when provided in the opening peripheral edge of the supply port is formed on the bottom surface of the filled container together
If a seal part that comes into contact with the upper surface of the mold is provided on
It is possible to prevent the molding material from entering between the filling container and the mold during filling.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a cross section of a molding material filling apparatus 1 according to the embodiment set above a mold 51. 2 is a plan view of the molding material filling apparatus 1, and FIG. 3 is a perspective view of the stirring unit 7.

First, the mold 51 of FIG. 1 is provided with an outer mold 53, a middle mold 54, a lower mold 55 and an unillustrated upper mold which surrounds the cavity 52, and these are supported by a mounting plate 56 and the like, and the cavity 52. Then, a predetermined amount of a powdery or granular molding material (not shown) made of resin or the like is filled from above, and the mold is clamped, heated and melted to mold a cylindrical molded product (not shown). The figure shows a state in which the upper mold is lifted and the mold is opened. In this state, the cavity 52 is filled with powdery or granular molding material from above.

The filling device 1 is provided with a box-shaped filling container 2, a conical slope 3 having a hopper shape is provided inside the filling container 2, and a flat circular surface is provided below the conical slope 3. A supply port 4 is provided. The upper surface of the filling container 2 is circularly opened, and a plate-shaped support member 5 is installed there. The shaft 8 of the stirring unit 7 is rotatably supported in the center of the support member 5 via a bearing 6. Has been done.

The shaft 8 coaxially comprises a small diameter portion 8a on the inner circumference of the bearing 6, a large diameter shaft portion 8b below it, a small diameter shaft portion 8c below it, and a pulley portion 8d above the small diameter portion 8a. The large-diameter shaft portion 8b and the small-diameter shaft portion 8c are provided with rod-shaped stirring blades 9 horizontally on a required number (eight in the figure),
In addition, a required number of plate-shaped supply blades 10 are provided below it (2 in the figure).
It is installed horizontally.

As shown in FIG. 3, each of the rod-shaped stirring blades 9 is attached by inserting and fixing a round rod into an insertion hole provided in the peripheral surface of the large diameter shaft portion 8b or the small diameter shaft portion 8c. Therefore, the length of the round bar is gradually reduced from the upper side according to the inclination angle of the conical slope 3. The plate-shaped supply blade 10 is formed by combining two flat plates in a screw shape, so that the plates are inclined. For convenience, 10 stirring blades 9 and supply blades 10 are arranged in the same plane.

A drive source 1 such as a motor for rotating the stirring section 7.
1 is attached to the lower surface of a plate-shaped bracket 12, and this bracket 12 is attached to one end of the support member 5. The drive source 11 is provided with a drive source side pulley 13, and an O-ring which is an endless belt 14 is wound between the drive source side pulley 13 and the pulley portion 8d of the shaft 8 of the agitating portion 7 so that a rotational torque is generated. It is being transmitted.

Further, a seal portion 15 is attached to the lower surface of the filling container 2 at the peripheral edge of the opening of the supply port 4, and the filling device 1 is mounted on the seal portion 15 with respect to the upper surfaces of the mold 51 and the mounting plate 56. It is designed to come into contact or be grounded. The material of the seal portion 15 is made of wear-resistant PTF.
Resin or rubber such as E or elastic body is preferable. The inner diameter of the seal portion 15 is substantially the same as the inner diameter of the cavity 52, and the plate-shaped supply blade 10 is rotatably positioned on the inner peripheral side of the seal portion 15.

The molding material filling device 1 having the above-mentioned structure is
It is attached to the tip of an operating rod 16 of a transfer cylinder (not shown) and operates as follows.

That is, when the transfer cylinder is actuated by the start of the filling work and the actuating rod 16 is extended, the filling device 1 slides above the mold 51, and the supply port 4 is coaxial with the cavity 52. The stirring unit 7 is rotated by the operation of the drive source 11 while being positioned above and stopped at this position. The powdery or granular molding material, which has been stored in the filling container 2 in a predetermined amount in advance, begins to freely fall into the cavity 52 at the same time when the supply port 4 starts to overlap with the cavity 52 in the vertical direction. Mouth 4 is cavity 52
Then, it falls coaxially and then falls freely into the cavity 52. Further, the molding material slides down along the conical slope 3 in the filling container 2, is stirred by the rod-shaped stirring blade 9 while being concentrated on the supply port 4, and is sprinkled by the plate-shaped supply blade 10.

Therefore, in the filling device 1, the following operational effects can be achieved.

That is, first of all, during the filling, the filling device 1 does not reciprocate left and right above the mold 51 as in the prior art, and the filling port 4 is filled while being positioned coaxially with the cavity 52. In addition, since the rod-shaped stirring blade 9 constantly agitates the molding material to promote the flow, the molding material can be efficiently filled in the cavity 52 in a relatively short time. Therefore, this shortens the time required for filling, shortens the molding cycle, and improves productivity.

When the molding material is filled in the cylindrical cavity 52, the rod-shaped stirring blades 9 stir the molding material,
Since the plate-shaped supply vanes 10 sprinkle the molding material, the molding material can be uniformly filled on the circumference. Moreover, since the filling device 1 does not reciprocate and the rod-shaped stirring blade 9 agitates the molding material, segregation of the molding material is less likely to occur. Therefore, from the above, molding is performed uniformly on the circumference without segregation, and the quality of the molded product is improved.

In addition to this, since the seal portion 15 is provided on the lower surface of the filling container 2 at the peripheral edge of the opening of the supply port 4, the molding material is filled between the filling container 2 and the mold 51 during filling. Can be prevented from entering. Therefore, after the filling, the molding material that has entered between the filling container 2 and the mold 51 does not need to be removed, and the mold can be immediately clamped, which shortens the molding cycle and improves the productivity. Further, if the material of the seal portion 15 is excellent in abrasion resistance, it is resistant to abrasion due to repeated sliding.

After the completion of the filling operation, when the transfer cylinder is actuated and the actuating rod 16 is contracted, the filling device 1 causes the die 51 to move.
After returning to the standby position on the left side of the figure, the mold 51 is clamped.

[0028]

The present invention has the following effects.

That is, first, in the molding material filling apparatus according to claim 1 of the present invention having the above-mentioned configuration, during filling,
The filling device does not reciprocate left and right above the mold as in the prior art, filling is performed while the supply port is coaxial with the cavity, and the rod-shaped stirring blade constantly stirs the molding material. In order to promote the flow, the molding material can be efficiently filled in the cavity in a relatively short time. Therefore, the time required for filling or the molding cycle can be shortened, and the productivity can be improved.

When the molding material is filled in the cylindrical cavity, the rod-shaped stirring blades stir the molding material to form a plate-shaped material.
And a shape that combines two flat plates into a screw shape
Since the supply vanes of (1) sprinkle the molding material, it is possible to uniformly fill the molding material on the circumference. Further, since the filling device does not reciprocate and the rod-shaped stirring blades stir the molding material, segregation of the molding material is less likely to occur. Therefore, from the above, it is possible to perform uniform molding without segregation on the circumference, and improve the quality of the molded product.

In addition to this, in the molding material filling apparatus according to the second aspect of the present invention having the above-mentioned structure, the lower surface of the filling container, which is the peripheral edge of the opening of the supply port , contacts the upper surface of the mold.
Since the seal portion to be touched is provided, it is possible to prevent the molding material from entering between the filling container and the mold during filling. Therefore, after the filling, it is not necessary to remove the invading molding material, and the mold can be clamped immediately, whereby the molding cycle can be shortened and the productivity can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a state where a molding material filling device according to an embodiment of the present invention is set above a mold.

FIG. 2 is a plan view of the molding material filling device.

FIG. 3 is a perspective view of a stirring unit.

FIG. 4 is an explanatory view of a molding material filling device according to a conventional example.

5A and 5B are diagrams for explaining the segregation phenomenon. FIG. 5A is an explanatory diagram before the phenomenon occurs, and FIG. 5B is an explanatory diagram after the phenomenon occurs.

[Explanation of symbols]

1 Molding material filling device 2 filling containers 3 conical slope 4 supply ports 5 Support members 6 bearings 7 stirring section 8 axes 8a small diameter part 8b Large diameter shaft 8c Small diameter shaft 8d pulley section 9 stirring blades 10 supply blades 11 Drive source 12 brackets 13 Drive side pulley 14 Endless belt 15 Seal part 16 Working rod 51 mold 52 cavity 53 External 54 Medium 55 Lower mold 56 Mounting plate

Claims (2)

(57) [Claims] 1. A cavity (52) inside a mold (51).
A filling container (2) having a conical slope (3) and a supply port (4) below the device (1) for filling a powdery or granular molding material from above. A stirring blade (9) provided with a shaft (8) rotating in the filling container (2) and provided on the outer circumference of the shaft (8) and an outer circumference of the shaft (8) of the stirring blade (9). A stirring unit (7) provided with a supply blade ( 10) provided below, and in the stirring unit (7), the stirring blade (9) is
The supply blade (10) has a rod shape.
It is a plate shape and two flat plates are combined in a screw shape.
A molding material filling device, which is characterized in that 2. The molding material filling device according to claim 1 , further comprising a seal portion (15) provided on a lower surface of the filling container (2) and at an opening peripheral edge of the supply port (4).
(15) is configured to come into contact with the upper surface of the mold (51).
Molding material filling apparatus characterized by being.