JPH10193360A - Molding material filling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding material filling device for filling a powdery material or a granular material into a cavity in a mold from above which can fill the molding material with good efficiency in a comparatively short time to improve the productivity, prevent the uneven loading or segregation and improve the quality of a molded product. SOLUTION: A device is provided with a filling container 2 with a conical inclined face 3 and a feed opening 4 below the face and an agitation section 7 having bar-shaped agitation blades 9 with a shaft 8 rotated in the filling container 2 and provided on the outer periphery of the shaft 8 and a plate- shaped agitation blade 10 forming the outer periphery of the shaft 8 and formed below the bar-shaped blade 9.

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 apparatus for filling a cavity in a mold from above with a powdery or granular molding material in a powder molding press 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 from above, a reciprocating molding material filling device 71 shown in the figure is conventionally used.

[0003] First, a mold 51 is provided with a cavity 52.
An outer mold 53, a middle mold 54, a lower mold 55, and an upper mold (not shown) are provided. These 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. This is to form a cylindrical molded product (not shown) by filling a fixed amount, closing the mold, and melting by heating. The figure shows a state when the upper mold is opened and the mold is opened. In this state, the cavity 52 is filled with a 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 mounted on the support plate 72, and a bottomless box mounted on an operating rod 74 of the transfer cylinder 73. And a transfer container 73 that is operated by the transfer cylinder 73.
Repeats a reciprocating motion in the left and right direction in the figure above the cavity 52, and while repeating this reciprocating motion, the filling container 75
The molding material 61 inside is freely dropped into the cavity 52.

However, this prior art has the following disadvantages.

[0006] The filling time is long due to the reciprocating stroke. Variations in bulk density occur depending on the direction of reciprocation.
That is, since the filling container 75 reciprocates linearly, the molding material 61 along the reciprocating direction as shown in FIG.
(Uneven filling) occurs, which adversely affects the quality of the molded product. Segregation of the molding material 61 due to the reciprocating motion occurs. That is, when the size of the particles of the molding material 61 is large or small,
Although large particles and small particles should originally be mixed as shown in FIG. 5 (A), the large particles and small particles move up and down as shown in FIG. And this has a negative effect on the quality of the molded article.

[0007]

SUMMARY OF THE INVENTION In view of the above points, the present invention can efficiently fill a molding material in a relatively short time, thereby improving the productivity and improving the efficiency of the molding material. It is an object of the present invention to provide a molding material filling apparatus capable of preventing segregation or segregation and thereby improving the quality of a molded product.

[0008]

To achieve the above object, a molding material filling apparatus according to the present invention is an apparatus for filling a cavity inside a mold from above with a powdery or granular molding material. A filling container provided with a supply port below the filling container, and a rod-shaped stirring blade provided on the outer periphery of the shaft and provided with a shaft rotating in the filling container, and an outer periphery of the shaft, And a stirring section provided with a plate-shaped supply blade provided below the stirring blade.

According to a second aspect of the present invention, there is provided a molding material filling apparatus according to the first aspect, further comprising a sealing portion provided on a lower surface of the filling container and at a periphery of an opening of the supply port. I made it.

In the filling material filling apparatus according to the first aspect of the present invention having the above structure, the agitating section does not reciprocate during the filling operation but stops above the cavity of the mold in the open state. The cavity is filled with the molding material while rotating to stir the molding material. Therefore, it is possible to efficiently fill the molding material in a relatively short time, and when filling the cylindrical cavity with the molding material,
It is possible to uniformly fill the molding material on the circumference. In addition, 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 into the cavity from the supply port provided below the conical slope, and has a rod-like agitation in the process of concentrating on the supply port. It is agitated by the blades and sprinkled by the plate-shaped supply blades.

[0012] In addition to this, as in the molding material filling apparatus according to the second aspect of the present invention having the above-described structure, a seal portion is provided on the lower surface of the filling container and around the opening of the supply port. During the filling, it is possible to prevent the molding material from entering between the filling container and the mold.

[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 state in which a molding material filling apparatus 1 according to the embodiment is set above a mold 51. FIG. 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 shown in FIG. 1 includes an outer mold 53, a middle mold 54, a lower mold 55, and an upper mold (not shown) surrounding the cavity 52. These are supported by a mounting plate 56 and the like. A predetermined amount of a powdery or granular molding material (not shown) made of resin or the like is filled from above, the mold is clamped, and heated and melted to form a cylindrical molded product (not shown). The figure shows a state in which the upper mold is opened and the mold is opened. In this state, the cavity 52 is filled with a powdery or granular molding material from above.

The filling device 1 is provided with a box-shaped filling container 2. A hopper-shaped conical slope 3 is provided inside the filling container 2, and a flat circular shape 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-like support member 5 is erected there. A shaft 8 of a stirring unit 7 is rotatably supported at the center of the support member 5 via a bearing 6. Have been.

The shaft 8 has a small-diameter portion 8a on the inner periphery of the bearing 6, a large-diameter shaft portion 8b below the small-diameter portion 8c, a small-diameter shaft portion 8c below the small-diameter portion 8c, and a pulley portion 8d above the small-diameter portion 8a. A required number (eight in the figure) of rod-shaped stirring blades 9 are horizontally mounted on the outer periphery of the large-diameter shaft portion 8b and the small-diameter shaft portion 8c.
Below this, the required number of plate-like supply blades 10 (2 in the figure)
It is mounted horizontally.

As shown in FIG. 3, the rod-shaped stirring blades 9 are attached by inserting and fixing a round bar into insertion holes provided in the peripheral surface of the large-diameter shaft portion 8b or the small-diameter shaft portion 8c. The length of the round bar is gradually reduced from the top 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 each plate is inclined. Conveniently 10 (sheets) of the stirring blade 9 and the supply blade 10 are arranged on the same plane.

A driving source 1 such as a motor for rotating the stirring unit 7
1 is attached to the lower surface of a plate-shaped bracket 12, and the bracket 12 is attached to one end of the support member 5. The drive source 11 includes 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 8 d of the shaft 8 of the agitating unit 7, and the rotational torque is reduced. To be transmitted.

A seal portion 15 is attached to the lower surface of the filling container 2 and the periphery of the opening of the supply port 4. It is designed to contact or ground. The material of the seal portion 15 is PTF having wear resistance.
A resin or rubber such as E or an elastic body is preferable. The inner diameter of the seal portion 15 is substantially the same size 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 apparatus 1 having the above configuration is
Attached to the tip of the operating rod 16 of the transfer cylinder (not shown), it operates as follows.

That is, when the transfer cylinder is operated by the start of the filling operation and the operating 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 stopped at this position. The powdery or granular molding material previously stored in the filling container 2 in a predetermined amount starts to fall freely into the cavity 52 at the same time as the supply port 4 starts to overlap the cavity 52 up and down, but most of the supply Mouth 4 is cavity 52
, And 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 operation and effect can be obtained.

That is, first, during filling, the filling apparatus 1 does not reciprocate right and left above the mold 51 as in the prior art, and the filling is performed while the supply port 4 is positioned coaxially with the cavity 52. In addition, since the rod-shaped stirring blade 9 constantly stirs the molding material to promote the flow, the molding material can be efficiently filled in the cavity 52 in a relatively short time. Therefore, the filling time is shortened, the molding cycle is shortened, and the productivity is improved.

When filling the molding material into the cylindrical cavity 52, the rod-shaped stirring blade 9 stirs the molding material.
Since the plate-shaped supply blade 10 spreads the molding material, the molding material can be uniformly filled on the circumference. In addition, since the filling device 1 does not reciprocate and the rod-shaped stirring blade 9 stirs the molding material, segregation of the molding material hardly occurs. Accordingly, uniform and non-segregated molding is performed on the circumference from these facts, and the quality of the molded product is improved.

In addition, since the sealing portion 15 is provided on the lower surface of the filling container 2 and around the opening of the supply port 4, the molding material is placed between the filling container 2 and the mold 51 during filling. Can be prevented from entering. Therefore, after filling, the mold material that has entered between the filling container 2 and the mold 51 does not need to be removed, and the mold can be clamped immediately, thereby shortening the molding cycle and improving productivity. If the material of the seal portion 15 is excellent in wear resistance, the seal portion 15 is resistant to wear due to repeated sliding.

After the filling operation is completed, when the transfer cylinder is operated and the operating rod 16 is contracted, the filling device 1 is moved to the mold 51.
From above, returns to the standby position on the left side in the figure, and the mold 51 is continuously clamped.

[0028]

The present invention has the following effects.

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

When filling the molding material into the cylindrical cavity, the rod-shaped stirring blade stirs the molding material, and the plate-shaped supply blade sprinkles the molding material, so that the molding material is uniformly filled around the circumference. can do. Also, because the filling device does not reciprocate, and the rod-shaped stirring blade stirs the molding material,
Segregation of molding material hardly occurs. Therefore, it is possible to perform uniform and non-segregated molding on the circumference from these points,
The quality of the molded article can be improved.

In addition to the above, in the molding material filling apparatus according to the second aspect of the present invention having the above-described structure, since the sealing portion is provided on the lower surface of the filling container and around the opening of the supply port. During the filling, it is possible to prevent the molding material from entering between the filling container and the mold. Therefore, after filling, the mold material can be immediately clamped without having to remove the intruding molding material, thereby shortening the molding cycle and improving the productivity.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which a molding material filling apparatus according to an embodiment of the present invention is set above a mold.

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

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

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

FIGS. 5A and 5B are explanatory diagrams illustrating a segregation phenomenon, wherein FIG. 5A is an explanatory diagram before the phenomenon occurs, and FIG. 5B is an explanatory diagram after the phenomenon occurs.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molding material filling apparatus 2 Filling container 3 Conical slope 4 Supply port 5 Support member 6 Bearing 7 Stirring part 8 Shaft 8a Small diameter part 8b Large diameter shaft part 8c Small diameter shaft part 8d Pulley part 9 Stirring blade 10 Supply blade 11 Drive source 12 Bracket 13 Drive source side pulley 14 Endless belt 15 Sealing part 16 Working rod 51 Mold 52 Cavity 53 Outer mold 54 Middle mold 55 Lower mold 56 Mounting plate

Claims (2)

[Claims] 1. A cavity (52) inside a mold (51).
(1) a filling container (2) having a conical slope (3) and a supply port (4) below the conical slope (3); A rod-shaped stirring blade (9) provided in the outer periphery of the shaft (8) and having a shaft (8) rotating in the filling container (2), and the rod-shaped stirring blade on the outer periphery of the shaft (8) A plate-like supply blade (1) provided below (9)
And a stirrer (7) provided with 0). 2. The molding material filling apparatus according to claim 1, further comprising a sealing portion provided on a lower surface of the filling container and at a periphery of an opening of the supply port. Material filling equipment.