JPH02182417A - Opening and closing apparatus - Google Patents

Abstract

PURPOSE:To make high speed and space-saving possible by shifting in parallel a second parallel linkage mechanism by a first parallel linkage mechanism, and performing open and close of an opening and closing body via a holding member. CONSTITUTION:A molding mold 27 wherein polyurethane liquid is injected is shifted to a mold clamping position by a carriage, and a roller 33 attached to an upper mold is held between holding rods 18, 18 of a holding member 3, so that a motor 19 positively rotates, and thus, the linkage arms 4, 5 of a first linkage mechanism 1 angularly moves in a counterclockwise direction as fulcrums of axes 7, 8 in order to move in parallel the linkage arms 9, 12 of a second parallel linkage mechanism 2. Therefore, since the holding member 3 is moved circularly, at the same time, revolves as fulcrum of an axis of 15, there never occur jamming or the like between the holding roller 3 and roller 33, and thus, the upper mold 30 of the molding mold 27 can be mold-clamped smoothly.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to an opening/closing device used for opening and closing a molding die used in a continuous production line for molded articles made of polymeric materials such as polyurethane. It is related to.

[Conventional technology]

Polymer material molded products, such as seat cushions for automobile seats, are produced using a circulating production line, with a process of spraying a mold release agent onto a mold, and then setting the necessary parts into the mold. Next, there is a step of injecting a stock solution of a polymeric material, for example, a stock solution of polyurethane, into the mold, a step of closing the mold to foam the stock solution of polyurethane, and a step of curing the foam, and a step of curing the foam. The mold is continuously manufactured through the steps of opening the mold and extracting the foam from the mold.

The opening and closing of the molding die in such a continuous production line for polymeric material molded products is performed by the rotational movement of the upper mold, which is pivotally connected to the lower mold of the molding mold via a hinge or the like. A guide bar installed on the line side is used as the source. In other words, the roller attached to the upper die of the molding die is engaged with the guide bar in a movable manner, and as the mold moves, the roller is guided by the guide bar, thereby rotating the upper die to open and close it. let

By the way, when the polyurethane stock solution used as the material for the above-mentioned polymer material molded product is injected into the mold, it starts foaming immediately due to its nature, so the mold closes within a short time after the polyurethane stock solution is injected. There is a need.

However, as mentioned above, when opening and closing the mold by rotating the upper mold with a guide bar, it takes time to close the mold and the foamed polyurethane solution overflows from the mold, which is an inconvenience. occurs.

Therefore, it is known that an endless chain is used as an opening/closing device for the molding die. This opening/closing device has an endless chain arranged in an arc shape along the opening/closing locus of the upper mold of the mold, and a clamp that clamps a part of the upper mold of the mold is provided on a part of the endless chain. When the mold is moved to the mold closing position, a part of the upper mold of the mold is held between the clamps, and at the same time, the clamp is moved by an endless chain. and rotate it to close the mold.

[Problem to be solved by the invention]

By the way, with the above-mentioned opening/closing device, the mold can be closed in a short time and the problem of foamed polyurethane stock overflowing from the mold has been solved, but there is no way to support the endless chain on the line. This support means is large and complicated, and occupies a large area on the ground and space on the line, which has the disadvantage of hindering the movement of workers working on the line, and is expensive.

[Means to solve the problem]

This invention was made in view of the above-mentioned problems, and its purpose is to be suitable for closing molds for forming polymeric material molded products, to be able to operate at high speed with a single axis, and to have a structural structure. The object of the present invention is to provide a switchgear that is relatively simple and occupies a small area and space.

In order to achieve such an object, the present invention pivots one end of two link arms to a base, and connects the other end to one end of one link arm of a second parallel link mechanism to be described later. a first parallel link mechanism that is pivotally connected to each other and that makes reciprocating angular movement by an appropriate driving means; one end of two link arms is pivoted to the other end of one link arm of the first parallel link mechanism; and a second parallel link mechanism whose other end is pivotally connected to the link lever, and a link lever which is pivotally connected to the other end of both link arms of the second parallel link mechanism, and the opening/closing body and a clamping member having two clamping bars for clamping a roller protruding from the upper edge of the roller.

[Operation] The second parallel link mechanism is moved in parallel by the first parallel link mechanism, and the opening/closing body is opened and closed via the holding member by the parallel movement of the second parallel link mechanism.

〔Example〕

A case in which an embodiment of the present invention is applied to a molding die used in a continuous production line for polyurethane molded products will be described with reference to the drawings.

1 and 2 are a front view and a plan view of a lid closing device according to the present invention, in which two parallel link mechanisms (1) and (2) are shown.
and a lid holding member (3).

The first parallel link mechanism (1) has one end of two link arms (4) (5) pivoted to a base (6) (7) (8).
), and the other end portions having equal distances from the pivot shafts (7) and (8) are connected to one end portion of the link arm (9) of the second parallel link mechanism (2). Axis (10) (11) whose distance is equal to axis (7) (8)
The link arms (4) and (5) are respectively pivotally connected via the
When making a reciprocating angular movement around the pivots (7) and (8),
The link arm (9) of the second parallel link mechanism (2) always moves in parallel.

The second parallel link mechanism (2) connects one end of the two link arms (9) (12) to the other end of the link arm (5) of the first parallel link mechanism (1) with a pivot (11). )
(13) and the pivot (11)
(13), the other end is the same distance from the link lever (14), and the other end is the same distance from the pivot (11) (13).
), the pivot (15) is fixed integrally with the link lever (14), and the clamping member (3) is attached to this pivot (15). .

As shown in FIG. 3, the holding member (3) has approximately U-shaped side plates (17) fixed to both ends of the pivot shaft (15) of the second parallel link mechanism (2). Both side plates (
17) (17) Two pinching rods between (18) (1
8) are installed in parallel at predetermined intervals.

(19) is a drive motor with a reduction gear that can rotate forward and backward, which is installed on the base (6), and its output shaft (20) is connected to the first parallel link mechanism (1) via a coupling (21). ) is connected to the pivot (7).

Therefore, when the drive motor (19) is rotated in forward and reverse directions, the pivot (7) is caused to make a reciprocating angular movement via the coupling (21).
The reciprocating angular movement of this pivot (7) causes the first link mechanism (
The link arms (4) and (5) of 1) are caused to make reciprocating angular movements around the pivots (7) and (8). (22) and (23) are bearing members that rotatably support the pivots (7) and (8) of the first parallel link mechanism (1), and are mounted on the mounting base (24) on the base (6).
) (25). (26) is a balance weight provided to balance the load acting on the holding member (3), and is fixed to one end of the link arm (4) of the first parallel link mechanism (1). (27) is a trolley (
28) A molding die for forming a polyurethane molded product fixed in position a on the upper mold, in which an upper mold (30) is pivotally connected to the lower mold (29) via a pin (31) so as to be freely openable and closable. (30
) A bracket (32) is fixed to the upper edge of the bracket (32), and the clamping rod (18) of the lid clamping member (3) is attached to the bracket (32).
(18) A roller (33) that fits between the rollers (33) is installed in a protruding manner. The trolley (28) is disposed on a line-side transport device (not shown) that continuously circulates in the horizontal direction at a predetermined speed, and as the trolley (28) moves, the molding die (27) also moves in a predetermined direction. Continuous circular movement in the horizontal direction at a speed of . When the upper mold (30) of the molding die (27) is in an open state, the roller (33) is in the mold closing position where the upper mold (30) of the molding die (27) is closed, and the roller (33) is moved between the clamping members (3). Bar (1B) (1
8) Attach to the upper mold (30) via the bracket (32) so that it is inserted between them.

Next, the operation procedure of this invention will be explained.

FIG. 1 shows the upper mold (30) of the molding die (27) in an open state. In this state, the molding die (27) immediately after injecting the polyurethane stock solution into the lower mold (28) is placed on the trolley (28).
The roller (33) attached to the upper mold (30) via the bracket (32) is sandwiched between the clamping rods (1B) (1B) of the clamping member (3). Then, the drive motor (19) is rotated forward to rotate the pivot (7) counterclockwise in the figure by a predetermined angle. This allows the first
The link arms (4) and (5) of the parallel link mechanism (1) of the second parallel link mechanism (2) move angularly in the counterclockwise direction in the figure using the pivot shafts (7) and (8) as fulcrums. 9)
Since (12) is translated in parallel as shown by the imaginary line in the figure,
The clamping member (3) is caused to move in an arc. For this reason, the upper mold (30) is moved to the pin (31) via the roller (33) inserted between the clamping rods (18) (18) of the clamping member (3).
) as a fulcrum and rotate counterclockwise in the figure to remove the mold (27).
Close the mold. At this time, the holding member (3) simultaneously moves in an arc, and at the same time, the upper die (30) is moved by the second parallel link mechanism (2).
) as the posture of the roller (33) changes due to rotation of the pivot (
15) as a fulcrum.

As a result, the upper mold (30) of the molding die (27) can be smoothly closed without causing any curling between the clamping member (3) and the roller (33). When the mold (27) is transferred from the mold closing position by the trolley (28), the roller (33) attached to the upper mold (30) via the bracket (32) hits the clamping rod ( 1
B) (1B) The upper die (30) is released from the gap. After that, when the drive motor (19) is reversely rotated and the pivot (7) is rotated by a predetermined angle clockwise in the figure, the first
The link arms (4) and (5) of the parallel link mechanism (1) move angularly clockwise in the figure about the pivots (7 and 8) to move the link arms (9) of the second parallel link mechanism (2). ) (
12) is moved in parallel as shown by the solid line in the figure, thereby returning the holding member (3) to its original state in order to wait for the next mold closing.

〔Effect of the invention〕

According to this invention, the opening/closing body can be opened and closed in a short time, and there is no need to provide support means on the line, so the space on the line can be used effectively and the movement of line workers is restricted. Moreover, since it can operate at high speed in the l-axis, the switchgear itself can be made compact, and the area it occupies on the ground can be configured to be extremely small.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment in which the opening/closing device according to the present invention is applied to a mold used in a continuous production line for polyurethane molded products, Fig. 2 is a side view thereof, and Fig. 3 is a view of the clamping member. FIG. (1) - First parallel link mechanism, (2) - Second parallel link mechanism, (3) - Holding member, (4) (5) (9) (12) - Pivot, (14 )−・
-Link lever (17) (17)---Side plate,
(1B) (18) - Pincer, (19) - Drive motor.

Claims (1)

[Claims] (1) One end of each of the two link arms is pivotally connected to the base, and the other end is pivotally connected to one end of one link arm of a second parallel link mechanism, which will be described later, for appropriate driving. a first parallel link mechanism that reciprocates angularly by a means; one end of two link arms is pivotally connected to the other end of one link arm of the first parallel link mechanism; a second parallel link mechanism pivotally connected to the link levers; and a second parallel link mechanism attached to the link levers pivotally connected to the other ends of both link arms of the second parallel link mechanism, and protruding from the upper edge of the opening/closing body. An opening/closing device comprising a clamping member having two clamping rods for clamping a roller.