JPS6323132Y2 - - Google Patents

Description

[Detailed description of the invention] This invention consists of a movable upper mold provided above a frame, a rotary table rotatably supported on the frame, and a plurality of lower molds placed on the rotary table. , a mold transfer device for an injection molding machine comprising a pressure receiving table provided on the frame and slidably supporting the rotary table;
In particular, the present invention relates to a mold transfer device for an injection molding machine in which the pressure receiving table is provided with a compressed air supply port that opens toward the upper surface of the pressure receiving table.

2. Description of the Related Art Conventionally, mold transfer devices for injection molding machines as shown in FIGS. 1 and 2 have been widely used.

In the figure, 1 is a frame, and four tie bars 2 are slidably provided through the frame 1. An upper mold plate 3 is fixed to the upper end of the tie bar 2, and a cross plate 4 is fixed to the lower end. A movable upper mold 5 is attached to the lower part of the upper mold plate 3.

On the other hand, a rotary table 6 is rotatably provided on the frame 1 and has one of the tie bars 2 as a rotation center, and a plurality of lower molds 7 are placed on the rotary table 6. As the rotary table 6 rotates, the lower mold 7 is sequentially placed in a position where it can be aligned with the upper mold 5. The rotary table 6 is slidably supported on a pressure receiving table 8 provided on the frame 1.

In addition, 9 is a gear formed around the rotary table 6, 10 is a small gear that meshes with the gear 9, and 1
1 is a mold clamping device suspended at the bottom of the frame 1;
2 is an injection unit, and 13 is a floating regulating member for the rotary table 1.

As shown in FIG. 2, the rotary table 6 on which a plurality of lower molds 7 are placed is placed and supported on the pressure receiving table 8 and rotates, so that lubricant is supplied to the sliding surface. However, the frictional resistance is still quite large,
Driving the rotary table requires a large amount of power, and particularly when poor lubrication occurs, a very large amount of driving power is required.

In addition, the pressure receiving table easily wears out due to friction with the rotary table, and as this wear progresses, it becomes impossible to maintain the horizontality of the rotary table, which impedes its rotational movement. Force does not act evenly on the parts, and stress tends to concentrate in various places.
Furthermore, there was a drawback that the mold clamping was incomplete.

The purpose of this invention was to supply compressed air to the pressure receiving table installed on the frame and supporting the rotary table, in view of the problems caused by the structural limitations of the pressure receiving table in the mold transfer device of the injection molding machine based on the above-mentioned conventional technology. An excellent mold transfer device that eliminates the above-mentioned drawbacks and makes the rotational movement of the rotary table extremely smooth by providing a configuration in which the compressed air supply port opens toward the top surface of the pressure receiving table. The aim is to provide the equipment.

The structure of this invention in accordance with the above purpose is that when the rotary table is rotated, compressed air is supplied to the pressure receiving table, the compressed air is jetted from the top surface of the pressure receiving table, and is blown onto the bottom surface of the rotary table. The gist of this method is to raise the rotary table by a minute gap from the mold, then rotate the rotary table, and when clamping the mold, stop the supply of compressed air and support the rotary table on the pressure receiving table.

Next, an embodiment of this invention will be described below based on FIGS. 3 and 4.

In the figure, a compressed air supply port 15 is bored in a pressure receiving table 8 provided on a frame 1, and the compressed air supply port 15 branches inside the pressure receiving table 8 and is connected to the upper surface of the pressure receiving table 8, respectively. It is open towards
A spout recess 16 is provided in the opening on the upper surface of the pressure receiving table 8.
is formed. The compressed air supply port 15 is connected to a compressed air supply pipe 17. Reference numeral 18 denotes a sleeve, which is fixed to the frame 1, through which the tie bar 2 passes vertically slidably.

The rotary table 6 is fitted onto the outer periphery of the sleeve 18 so as to be rotatable and slidable up and down, and its upward movement is restricted by the upper flange 18a of the sleeve 18.

Note that the other components are the same as those indicated by the same reference numerals in FIGS. 1 and 2.

In the above configuration, the rotary table 6 after opening the mold
When the compressed air is supplied from the compressed air supply pipe 17 to the compressed air supply port 15 of each pressure receiving table 8 during rotation, the compressed air is branched to each compressed air supply port 15 in the pressure receiving table 8, and the compressed air is distributed to the top surface of the pressure receiving table 8. Each spout recess 16
The liquid is ejected upward from the rotary table 6 and is sprayed onto the lower surface of the rotary table 6. For this reason, the rotary table 6
leaves the upper surface of the pressure receiving table 8 and rises slightly, and the pressure receiving table 8
A minute gap is formed between the upper surface of the In this state, rotate the rotary table 6 and transfer the next lower mold 7 to the upper mold 5.
transport to a position where it can be aligned.

After the rotary table 6 has stopped and the supply of compressed air is stopped, the rotary table 6 is lowered and placed and supported on the pressure receiving table 8. Thereafter, when the mold is clamped, the clamping load is supported on the pressure receiving table 8.

In the above embodiment, there are four pressure receiving tables 8,
Although the number of ejection recesses 16 in the pressure receiving table 8 is illustrated as six, the number is not limited to this, and may be appropriately determined depending on various conditions such as the size of the rotary table 6 and the number of lower molds 7. Of course, this is something that can be done.

As described above, according to this invention, an injection molding machine includes a rotary table on which a plurality of lower molds are placed facing a movable upper mold, which is rotatably supported on a frame via a pressure receiving table. In the mold transfer device of
By configuring the pressure receiving table to have a compressed air supply port that opens toward the top surface of the pressure receiving table, compressed air is ejected from the compressed air supply port toward the top of the pressure receiving table when the rotary table rotates. Since the rotary table is sprayed onto the rotary table to levitate the rotary table, it has the excellent effect that only a very small amount of power is required to rotate the rotary table.

In addition, since the rotation is in a non-contact state with the pressure receiving table, the pressure receiving table and the rotary table do not suffer any wear due to friction, and the horizontality of the rotary table is maintained forever, and even during mold clamping. This has the effect of equalizing the mold clamping load to each part.

[Brief explanation of the drawing]

Figure 1 is a front view of the mold transfer device of the injection molding machine.
FIG. 2 is a cross-sectional view taken along the line AA in FIG. 1 showing a conventional example, FIG. 3 is a cross-sectional view showing an embodiment of this invention, and FIG. 4 is a cross-sectional view taken along the line B-B in FIG. 3. 1...Frame, 3...Upper mold plate, 4...Cross plate, 5...Movable upper die, 6...Rotary table, 7...Lower die, 8...Pressure table, 15...Compressed air supply port , 16...Gushing recess.

Claims (1)

[Scope of utility model registration request] a movable upper mold 5 provided above the frame 1;
A rotary table 6 rotatably supported on the frame 1, a plurality of lower molds 7 placed on the rotary table 6, and a rotary table 6 provided on the frame 1 to slidably support the rotary table 6. A mold transfer device for an injection molding machine comprising a pressure receiving table 8, characterized in that the pressure receiving table 8 is provided with a compressed air supply port 15 that opens toward the upper surface of the pressure receiving table 8. Mold transfer device for molding machine.