JPH0221210Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The invention is based on a rotary table rotatably attached to a central axis, on which a plurality of molds, each of which has a movable mold pivoted to a fixed mold, are mounted. The present invention relates to an improvement of a mold opening/closing mechanism in a rotary table type mold opening/closing device in which a predetermined mold among a plurality of molds is opened as the rotary table rotates.

<Prior Art> Conventionally, the rotary table type mold opening/closing device of the above type has been shown, for example, in FIGS. 4 and 5.
This rotary table type mold opening/closing device 111 (hereinafter abbreviated as "mold opening/closing device") has, for example, eight molds 50 placed at equal intervals in the circumferential direction on a rotary table 30, and each mold 50 is movable. The structure was such that the mold 50a was opened and closed by a hydraulic cylinder 60.
(See Publication No. 89320). This hydraulic cylinder 60 is controlled by an electromagnetic valve 70, and from the electromagnetic valve 70, an oil supply pipe 90a and a return pipe 90b are connected via a rotary joint 80, and a control line 110 is connected via a slip ring 100. It passes through the hollow central shaft 20 and is connected to an external control panel (not shown).

The rotary table 30 rotates intermittently around the central axis 20, and at a certain position, the hydraulic cylinder 60 closes the movable mold 50a to perform material injection, vulcanization, etc. It will be done. on the other hand,
At a certain position, the hydraulic cylinder 60 opens the movable mold 50a to take out the molded product, apply a mold release agent, etc. If such a mold opening/closing device 111 is used, different molded products can be continuously molded by preparing various molds 50.

Incidentally, reference numeral 40 in the figure is a rotating disk that rotates around the central axis 20 in synchronization with the rotary table 30, and a hydraulic cylinder 60 and an electromagnetic valve 70 are suspended therefrom. Further, reference numeral 50b is a fixed mold with respect to the movable mold 50a, and is fixed to the rotary table 30.
Further, the fixed mold 50b and the movable mold 50a are pivotally connected, so that the movable mold 50a can rotate relative to the fixed mold 50b.

<Problems to be solved by the invention> However, in the case of this mold opening/closing device 111, the mold 5
0, a hydraulic cylinder 60, an electromagnetic valve 70,
A control line 110, an oil supply pipe 90a, and a return pipe 90b are arranged, and the control line 110, the oil supply pipe 90a, and the return pipe 90b are concentrated on one hollow central shaft 20. There is. Therefore, (i) Since the number of parts is large, the cost of the device is high and maintenance is time-consuming.

(ii) In particular, the slip ring 100 where the control lines 110 are concentrated, and the rotary joint 80 where the oil supply side piping 90a and return side piping 90b are concentrated.
There is a risk that a failure may occur.

There were other problems.

<Means for Solving the Problems> The present invention was made to solve the above problems, and a rotary table rotatably attached to a central axis has a movable type pivoted to a fixed type. A rotary table-type mold opening/closing device in which a plurality of molds are mounted, and as the rotary table rotates, a predetermined mold among the plurality of molds is opened. A fixed disk non-rotatably fixed to the central axis above is provided with a guide member extending downward in a vertical direction on its peripheral edge,
Each movable mold of the plurality of molds is provided with a mold opening/closing arm, and the plurality of molds are arranged so that the guide member is located on the virtual circumference connecting the tips of the arms. They are placed on the periphery of the rotary table at equal intervals in the circumferential direction, and the tip of each arm is in contact with the undulating surface of the guide member, and the rotation of the rotary table causes the tip of each arm to contact the guide member. A mold opening/closing system having a mechanism for rotating a given movable mold relative to a fixed mold by moving the tip of each arm vertically relative to a rotary table in accordance with the undulating surface of the mold. It is a device.

<Example> Hereinafter, an example of the present invention will be described based on illustrated examples (FIGS. 1 to 3).

FIG. 1 is a sectional view showing a schematic mechanism of the mold opening/closing device 1 of the embodiment, FIG. 2 is a sectional view along the - arrow line in FIG. 1, and FIG. 3 is a guide member 8 (mold FIG. 8 is a perspective view showing the opening guide member 8A).

Disc-shaped rotary table 3 of mold opening/closing device 1 of the embodiment
For example, eight molds 5 are mounted on the periphery at equal intervals, and are rotatably attached to the central axis 2 so that they can be rotated intermittently by, for example, a Geneva mechanism 13. Note that since a large torque is generated when the rotary table 3 rotates, a brake device 15 is provided in the Geneva mechanism 13 to ensure that the rotary table 3 stops.

The mold 5 placed on the rotary table 3 is a fixed mold 5
A movable mold 5a is pivotally attached to b. An arm 6 for opening and closing the mold is disposed on the movable mold 5a so as to face diagonally upward in the direction in which the central shaft 2 is located, that is, toward the center. Since each arm 6 has the same length, its tip is arranged on the virtual circumference. This virtual circumference is located directly below a guide member 8, which will be described later. By raising and lowering the tip of each arm 6, the movable mold 5a is rotated relative to the fixed mold 5b.
The mold 5 is then closed or opened. Note that a rotating roller 7 is attached to the tip of the arm 6. This rotary roller 7 allows the distal end of the arm 6 to easily move while contacting the guide member 8, and may be omitted.

A fixed disk 4 is fixed approximately at the center to the upper end of the central shaft 2, and a peripheral edge of the fixed disk 4 is provided with a vertically extending roller 7 that contacts a rotating roller 7 provided at the tip of each arm 6 of the mold 5. Plate-shaped guide member 8 with undulations
is provided facing downward. The guide member 8
Among them, three of the molds 5 (on the left in Fig. 2)
The undulating surface 9 of the lower edge of the guide member 8 is in charge of opening the movable mold 5a by contacting the rotary roller 7 at the tip of the arm 6 from above (mold opening guide member 8A), the other parts are in charge of closing the movable mold 5a by contacting the rotary roller 7 from below (mold clamping guide member 8
B).

As shown in FIG. 3, the mold opening guide member 8A is a bent plate-like member whose width is gently narrowed at both ends, and comes into contact with the rotating roller 7 of the arm 6 at the undulating surface 9 at its lower end. Mold opening guide member 8 in Fig. 3
In A, the narrow portion 8c guides the rotating roller 7 of the arm 6 downward as the rotating table 3 rotates, and the narrow portion 8e similarly guides the rotating roller 7 upward. On the other hand, the wide portion 8d of the mold opening guide member 8A maintains the rotating roller 7 of the arm 6 downward, thereby opening the movable mold 5a.

The opening/closing guide member 8B is also a bent plate-like member, but has an outer flange portion 10 at the end. A pressing member 11 using, for example, a spring force is disposed on the upper surface of the flange portion 10, and constantly urges the rotating roller 7 of the arm 6 upward to ensure that the mold 5 is in a mold-closed state. . In this embodiment, as shown in FIG. 2, the pressing members 11 are provided separately for each mold 5, but they may be integrated. Note that this pressing member 1
1 may be omitted, but in that case, the flange portion 1
0 comes into direct contact with the rotating roller 7, so accuracy is required for the position (height) of the flange portion 10.

Next, the operation of the mold opening/closing device 1 of the embodiment will be explained using urethane molding as an example, with reference to FIG. The rotary table 3 has a rotating roller 7 of an arm 6.
It rotates counterclockwise intermittently by 45 degrees (stop for 30 seconds, move for 4 seconds) so that it rests on the next pressing member 11. The state shown in FIG. 2 shows the rotary table 3 in a stopped state, and the molds 5C, 5D, and 5J are in the open state, while the molds 5E to 5I are in the closed state. Then, in a series of urethane molding processes, each mold 5
is placed in the following process.

(i) Mold 5C is a step in which a mold release agent is applied to the mold surface.

(ii) Mold 5D is a step in which two liquid materials (polyol component and isocyanate component) are injected.

(iii) Molds 5E to 5I are reaction hardening steps.
The mold clamping force was adjusted to 300 kg/cm ² .

(iv) The mold 5J is a process for taking out the molded product.

Next, when the rotary table 3 in FIG. 2 rotates 45 degrees, each mold 5 moves to the next process.
Regarding the mold 5D, as the rotary table 3 rotates, the rotating roller 7 of the arm 6 moves upward along the undulating surface 9 of the narrow part 8c of the mold opening guide member 8A, and presses the mold closing guide member 8B. Part 1
1, the movable mold 5a is rotated downward and the mold is closed. On the other hand, looking at mold 5I,
As the rotary table 3 rotates, the mold opening guide member 8A comes into contact with the rotary roller 7 of the arm 6 from above instead of the mold clamping guide member 8B, and the rotary roller 7 contacts the undulating surface 9 of the narrow portion 8e. Then, the movable mold 5a moves downward, and the movable mold 5a rotates upward to open the mold (the state shown in FIG. 3).
For the other molds 5C and 5J, the movable mold 5a is maintained in the open state, and for the molds 5E, 5F, 5G, and 5H, the movable mold 5a is maintained in the closed state.

According to the mold opening/closing device 1 of this embodiment, urethane molded products can be continuously molded.
In particular, preparing a wide variety of molds allows a single material supply device to be used to manufacture a wide variety of molded products, which helps improve productivity.

In the above, the rotary table may be any type as long as the mold 5 can be placed on the same circumference, and may be a regular octagonal plate member, for example. Furthermore, the number of molds 5 placed is not particularly limited.

Furthermore, it is also possible to use the mold opening/closing device of the present invention for injection molding, and in this case, it goes without saying that the material is injected after the movable mold 5a is closed.

<Operations and effects of the invention> As explained above, the mold opening/closing device of the invention has the following effects:
The tip of each arm contacts the undulating surface of the guide member, and as the rotary table rotates, the arm itself follows the undulating surface and moves vertically. As the arm moves, the movable mold rotates relative to the fixed mold, opening and closing the mold.

As described above, the mold opening/closing device of this invention uses an arm and a guide member as members for successively opening and closing a plurality of molds. Therefore, the number of parts is significantly reduced compared to the mold opening/closing devices of the conventional examples (fourth and fifth).

Therefore, the manufacturing cost of the device is reduced, breakdowns are less likely to occur, and maintenance becomes less troublesome. Furthermore, external equipment for controlling electromagnetic valves and hydraulic systems is not required, and from this point of view as well, the apparatus can be simplified.

[Brief explanation of the drawing]

The figure shows a rotary table type mold opening/closing device, FIG. 1 is a sectional view showing a schematic mechanism of the mold opening/closing device 1 according to an embodiment of the present invention, FIG. The figure is a perspective view showing the mold opening guide member 8A, and FIG. 4 is a conventional mold opening/closing device 1.
FIG. 5 is a cross-sectional view schematically showing the mechanism of 0, and FIG. 5 is a plan view as well. 1,111...(rotary table type) mold opening/closing device, 2,20...center axis, 3,30...rotary table, 4...fixed disk, 5a, 50a...movable type, 5b, 50b...fixed Type, 6...Arm, 8
. . . Guide member, 9 . . . undulating surface.

Claims (1)

[Claims for Utility Model Registration] A plurality of molds, each of which has a movable mold attached to a fixed mold, are mounted on a rotary table rotatably attached to a central axis, and as the rotary table rotates, a plurality of molds are mounted. A rotary table type mold opening/closing device in which a predetermined mold among the plurality of molds is opened, wherein a fixed disk fixed non-rotatably to the central axis above the rotary table includes: A guide member having up and down undulations in the vertical direction is provided on the peripheral edge thereof facing downward, and each movable mold of the plurality of molds is provided with a mold opening/closing arm, and the ends of each of the arms are tied together. so that the guide member is located on the virtual circumference,
The plurality of molds are placed on the periphery of the rotary table at equal intervals in the circumferential direction, and the tip of each arm is brought into contact with the undulating surface of the guide member, and is adapted to the rotational movement of the rotary table. Therefore, the tip of each arm corresponds to the undulating surface of the guide member, and the tip of each arm moves vertically with respect to the rotary table, thereby turning a predetermined movable mold into a fixed mold. A rotary table type opening/closing device characterized by being equipped with a mechanism for rotating it relative to a rotary table.