JP2793730B2 - Die changing device for vertical rotary molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold exchanging apparatus mounted on a vertical rotary molding machine for exchanging a mold used for a molding operation.

[0002]

2. Description of the Related Art Conventionally, as a kind of a rotary molding machine used for molding a multi-color molded product or an insert molded product, a movable plate is arranged so as to be able to approach or separate from a fixed plate positioned below the movable plate. And a rotating platen is provided on a surface of the movable plate facing the fixed plate so as to be relatively rotatable, and the rotation center lines of the lower surface of the rotating platen and the upper surface of the fixed platen. At least two sets of upper mold and lower mold are respectively mounted at positions symmetrical with respect to, and the molds are simultaneously clamped at a plurality of rotating positions where the rotating platen is rotated. A so-called vertical rotary forming machine is known.

In such a molding machine, at least two sets of dies are simultaneously clamped at a plurality of rotation positions of the rotation platen. It is necessary to accurately mount the mold with respect to the mold mounting positions of the rotating surface plate and the fixed platen with a predetermined relative positional relationship. For this reason, in the vertical rotary molding machine, there is a problem that the operation of replacing the mold is troublesome and requires a lot of time.

Accordingly, the applicant of the present application has previously described
No. 8407 discloses a novel vertical rotary molding machine equipped with an automatic die changing device. Such a vertical rotary molding machine, at the die mounting position of the fixed platen,
Each is provided with a mold supporting portion having a positioning protrusion for determining the mounting position of the mold, and these mold supporting portions are capable of moving up and down, so that the mold can be projected on the fixed platen. I have. Further, on the side of the fixed plate, a movable carriage is arranged so as to be able to reciprocate in parallel in one horizontal direction, and a plurality of mold mounting portions on which the molds are mounted by the movable carriage. A pair of integrally mounted mold mounted vehicles are respectively supported on the fixed plate so as to protrude and retract from the fixed plate in a direction perpendicular to the moving direction of the movable vehicle, and are interposed between the movable vehicle and the movable vehicle. The hydraulic cylinder mechanism is driven reciprocally.

That is, according to the vertical rotary molding machine provided with such a mold exchanging device, a mold mounting vehicle having a mold mounted on each mold mounting portion is protruded and moved onto a fixed platen. After that, the mold supporting portions are protruded to support the lower surfaces of the molds, and then the mold mounting vehicle is retracted and moved, and then the mold supporting portions are lowered to position each mold. It can be attached to the predetermined position defined by the protrusion.On the other hand, after projecting both mold support parts that support the mold, the unloaded mold mounting vehicle is moved to the fixed platen to move. , Then lower the mold support,
After each lower die is supported by the die mounting portion of the die-mounted vehicle, the die can be removed from the fixed plate by pulling and moving the die-mounted vehicle from above the fixed plate.

However, in recent years, the longitudinal dimension of molded products has been increasing due to the expansion of the range of use of resin molded products and the like, and accordingly, the length of the mold and the size of the molding machine have been increasing. I have. Therefore, when trying to use the mold changing device as described above, the moving distance of the vehicle equipped with the mold becomes large, so that the relationship between the cylinder diameter and the stroke of the hydraulic cylinder mechanism that drives it becomes unbalanced,
There has been a problem that operational and manufacturing problems are caused.

In addition, if the stroke of the hydraulic cylinder mechanism is increased in accordance with the increase in the moving distance of the vehicle equipped with a mold, the cylinder member becomes long and inevitably protrudes outward from the apparatus. In addition, there is a problem that the installation space of the device must be large.

[0008]

Here, the present invention has been made in view of the above-mentioned circumstances, and the object of the present invention is to use a long mold or a large molding machine. An object of the present invention is to provide a mold changing device for a vertical rotary molding machine which can be advantageously applied and requires a small installation space.

[0009]

According to the present invention, in order to solve the above-mentioned problem, a fixed plate, and an upper surface of the fixed plate, which are arranged so as to be able to approach and separate from each other and rotate on a surface facing the fixed plate. A movable platen rotatably mounted on a surface plate, and at least two sets of upper and lower dies mounted on the rotation surface plate and the fixed platen at a plurality of rotation positions of the rotation surface plate A mold exchanging device used for a vertical rotary molding machine for simultaneously clamping in different combinations, comprising: (a) a movable carriage arranged reciprocally in one horizontal direction along the fixed platen; (B) integrally including at least two mold mounting portions on which the molds are mounted, supported by the moving vehicle, and mounted on the fixed platen in a direction perpendicular to the moving direction of the moving vehicle. It is arranged so that it can protrude and retract
(C) a first hydraulic cylinder mechanism and a second hydraulic cylinder mechanism, which are connected in series with each other, and guide the mold to an installation position on the fixed board or take out the mold from the fixed board. A hydraulic cylinder mechanism is interposed between the movable carriage and each of the mold mounting vehicles to drive the mold mounting vehicle in the projecting and retracting directions with respect to the fixed platen. When the vehicle is positioned on the retracted end side, the first and second hydraulic cylinder mechanisms have a pair of drive means which are positioned so as to overlap with each other in the moving direction of the die-mounted vehicle. A feature of the present invention is a mold exchanging device for a molding machine.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

First, FIGS. 1 and 2 show a specific example of a vertical rotary molding machine provided with a mold changing device having a structure according to the present invention. In these figures, reference numeral 10 denotes a movable plate, which is disposed between an upper plate (not shown) and a lower plate 12 as a fixed plate, and which can be guided up and down by a tie rod 14. Reference numeral 16 denotes a rotating platen, which is disposed below the movable platen 10 so as to face the lower platen 12 and is rotated around its center line by an indexer 18 provided on the upper surface of the movable platen 10. It is rotatably supported. The two sets of dies 20, 20 to be described later are located at positions symmetrical with respect to the rotation center line of the rotation base 16 on the lower surface of the rotation base 16 and the upper surface of the lower base 12 opposed thereto. The two upper dies 22 and 22 and the two lower dies 24 and 24 are mounted, and the movable platen 10 is lowered in this state, whereby the turntable 16 is turned by 180 °. In these two rotation positions, the two sets of molds 20, 20 can be simultaneously clamped.

The movable platen 10 is lifted and lowered by a mold clamping cylinder (not shown) disposed between the movable platen 10 and the upper platen, and the mold clamping operation is also disposed between the movable platen 10 and the upper platen. This is performed by a mold clamping ram (not shown). The upper mold 22 and the lower mold 24 of the mold 20 are attached to the rotating platen 16 and the lower plate 12, respectively, by known attachment means such as an automatic mold clamper.

The lower plate 12 as the fixed plate includes:
As shown in the drawing, a pair of bottomed holes 26 having a planar shape smaller than the bottom surface of the lower die 24 are located at a die (lower die) mounting portion symmetrical to the rotation center of the rotary platen 16. , 26 are formed, and a pair of mold lifting / lowering devices are provided in the bottomed holes 26, 26.

Each of these mold elevating and lowering devices includes a block-shaped lift member 30 fitted to the opening of the bottomed hole 26 so as to protrude upward, a lower surface of the lift member 30 and a bottom surface of the bottomed hole 26. And an elevating cylinder 32 provided between them. In the lower position of the lift member 30 in the retracted state of the piston of the lift cylinder 32, the upper surface of the lift member 30 is made flush with the upper surface of the lower plate 12, and the piston of the lift cylinder 32 projects In the projecting position of the lift member 30 in FIG. 5, the upper surface of the lift member 30 is raised from the upper surface of the lower plate 12 by a certain height.

The lift 20 is driven by the lift cylinder 32 to move the mold 20 placed on the upper surface of the lift member 30 to a position where the mold 20 does not interfere with a mold mounting vehicle 34 described later. To rise up.

On the upper surface of each lift member 30, a suitable number (here, two) of positioning protrusions 36 each having a tapered guide portion are formed so as to protrude, and are mounted on the upper surface thereof. The mold 20 can be accurately held at a predetermined set position.

On the other hand, the upper surface of the lower plate 12 is opposed to each other with the lift members 30 interposed therebetween, at right angles to the direction in which the lift members 30 and 30 are arranged, and at the bottom width of the mold 20 (lower die 24). The width corresponding to the width of each pair, a total of four groove rails 44
Are formed parallel to each other. A longitudinal base 46 is arranged along one side surface of the lower board 12 where the groove rails 44 open.

The base 46 has a rectangular frame structure, and is provided with a pair of guide rails 48 extending over the entire length in the longitudinal direction, located at portions separated from each other in the width direction on the upper surface thereof. A movable carriage 50 is provided on the pair of guide rails 48.

The movable trolley 50 has a structure in which a frame member is assembled in a rectangular frame shape, and has a length capable of mounting two mold mounting vehicles 34 described later. Then, the movable carriage driving cylinder 52 disposed between the base 46 and the base 46 moves the guide rail 50 on the guide rail 50 in the longitudinal direction,
In other words, it can be reciprocated in a direction perpendicular to the groove rails 44 formed in the lower plate 12 with a stroke substantially equal to that of one set of the mold mounting wheel 34 set in advance.

Then, two sets of groove rail members 56 having the same groove rails 54 as the groove rails 44 are provided at the upper surface of the movable carriage 50 at intervals corresponding to the four groove rails 44. A total of eight groove rails are arranged in parallel to the width direction of the movable carriage 50, and when the movable carriage 50 is moved to the illustrated forward end or the opposite return end, respectively, each set of groove rails The four groove rails 54 formed on the member 56 are connected to the four groove rails 44 formed on the lower platen 12, respectively.

Also, on the movable carriage 50, two mold mounting vehicles which are respectively mounted on the two sets of groove rails 54 and which simultaneously mounts and transports the two sets of dies 20, 20. The movable carriage 50 is integrally reciprocated in the moving direction thereof in accordance with the reciprocating movement of the movable carriage 50.

Further, each mold-mounted vehicle 34 and the movable carriage 5
Between 0 and 0, a mold mounted vehicle driving means 58 is provided. Then, the mold loading vehicle driving means 58 guides the mold loading vehicle 34 to the groove rails 54 and 44 connected to each other and reciprocates between the movable carriage 50 and the lower plate 12. Has become. As a result, the mold mounting vehicle 34 is moved to the forward end on the lower platen 12 side, so that the two sets of molds 20 and 2 mounted on the upper surface thereof.
0 is conveyed above the lift members 30, 30 with high positioning accuracy.

In this case, in each of the mold mounting vehicles 34, a pair of mold mounting portions 60, 60 each having a U-shaped planar shape opened to the lower platen 12 side, sandwich a central connecting portion 62.
It has a structure integrally connected. Then, a pair of opposite arm portions 64, 64 of each mold mounting portion 60,
As described above, the rollers (not shown) attached to the lower surface can be guided and moved on the corresponding groove rails 54 and the groove rails 44 connected thereto in the direction in which they are disposed. ing. Also, the mold 20
It is positioned by the appropriate number of positioning projections 66 straddling the opposing arms 64, 64 and protruding from the upper surfaces of the arms 64, 64, and mounted on the mold mounting sections 60. It has become so.

The above-mentioned mold-mounted vehicle driving means 58, 58
Respectively, as shown in FIG. 2, the first hydraulic cylinder mechanism 68 and the second hydraulic cylinder mechanism 70,
They are connected in series with each other, and are interposed between the center connecting portion 62 of the mold mounting vehicle 34 and the movable carriage 50.

More specifically, the first hydraulic cylinder mechanism 6
Eight cylinders 72 are fixedly supported by the moving carriage 50 via brackets 84, and a slide member 76 that can be moved on the cylinders 72 is attached to a piston 74 thereof. Further, the slide member 76 supports the cylinder 78 of the second hydraulic cylinder mechanism 70, and the piston 80 of the second hydraulic cylinder mechanism 70
4 are connected to the center connection portion 62. And
As shown in FIG. 3, in the state where the pistons of the first and second hydraulic cylinder mechanisms 68 and 70 are protruded, the die mounting wheel 34 is moved forward (forward) to the die mounting position of the lower platen 12, In the retracted state of the pistons of the first and second hydraulic cylinder mechanisms 68 and 70, the mold mounting vehicle 34 is moved back (returned) to above the movable carriage 50.

That is, in the above-mentioned mold loading vehicle drive means 58, the mold loading vehicle 34 is reciprocated by the total stroke of the first hydraulic cylinder mechanism 68 and the second hydraulic cylinder mechanism 70. Therefore, the stroke amount of each of the hydraulic cylinder mechanisms 68, 70 can be set small, and the two cylinders 72, 78 overlap in the movement direction of the mold loading wheel 34 under the piston contracted state. The arrangement space can be made sufficiently smaller than when a single hydraulic cylinder mechanism is used. In this embodiment, in particular, both cylinders 7
2 and 78 are designed so that they can be housed in the central connecting portion 62 of the mold carrier wheel 34 under the piston contracted state.

It should be noted that the moving speed of the mold mounting vehicle 34 is determined based on the total amount of hydraulic oil supplied to and discharged from the first hydraulic cylinder mechanism 68 and the second hydraulic cylinder mechanism 70. , The two hydraulic cylinder mechanisms 68, 70
There is no particular need to consider the supply and discharge control of the hydraulic oil to and from the hydraulic oil.

Therefore, according to the vertical rotary molding machine provided with the mold exchanging device having the above-described structure, the above-mentioned actual 3-8
As disclosed in Japanese Patent No. 407, the removal and attachment of the mold can be performed automatically and with good positioning accuracy.

That is, first, the movable platen 10 is lowered to remove the upper dies 22 and 22 from the rotating platen 16, and the upper and lower dies 22 and 24 are overlapped on the lower plate 12. Raise the molds 20 and 20 (each upper and lower mold 2).
With the second and second hydraulic cylinder mechanisms 68 and 70 moving the empty die mounting vehicle 34 onto the lower platen 12 with the second and 24) protruding upward, the die mounting portion 60 , 60 are positioned below the molds 20, 20, and then the lift member 30 is lowered to move the molds 20, 20 to the mold mounting portions 60, 20.
After being supported by 60, the first and second hydraulic cylinder mechanisms 68, 70 retract the mold-mounted vehicle 34 onto the movable carriage 50, thereby removing the molds 20, 20 from the molding machine. Can be done.

Furthermore, when another mold is to be attached after the mold is removed as described above, the movable carriage 50 is driven by the movable carriage drive cylinder 52 to newly attach the new molds 20, 20. Is guided to the side of the lower platen 12, and after moving the die mounted vehicle 34 onto the lower platen 12 by the first and second hydraulic cylinder mechanisms 68, 70, , The lift member 30 is raised, and the mold 2
Under the condition that the 0, 20 is supported, the empty mold mounting vehicle 34 is retracted to the movable carriage 50 by the first and second hydraulic cylinder mechanisms 68, 70, and then the lift member 30 is lowered. Then, the lower dies 24, 24 are fixed to the lower plate 12, and thereafter, the movable plate 10 is lowered, so that the upper die 2
By fixing the molds 2 and 22 to the rotating platen 16, the dies 20 and 20 can be attached to a molding machine.

Particularly, in the mold exchanging apparatus having the above-described structure, the mold mounting vehicle driving means 58 connects the first hydraulic cylinder mechanism 68 and the second hydraulic cylinder mechanism 70 in series. The hydraulic cylinder mechanisms 68 and 70 are advantageously connected to each other even when a large amount of movement is required for the mold loading vehicle 34, so that the required stroke amounts of the hydraulic cylinder mechanisms 68 and 70 are advantageously suppressed. The operational and manufacturing problems caused by the imbalance in the relationship between the cylinder diameter and the stroke can be advantageously solved.

Moreover, the first hydraulic cylinder mechanism 6
8 and the second hydraulic cylinder mechanism 70, when the piston is contracted, the two cylinders 72 and 78 are positioned so as to overlap with each other. Such a mold mounted vehicle 34
The amount of outward protrusion of the hydraulic cylinder mechanism that drives the motor can be advantageously suppressed, so that the device can be made compact and the installation space can be effectively reduced. is there.

Although the embodiment of the present invention has been described in detail, this is a literal example, and the present invention is not construed as being limited to such a specific example.

For example, the mold mounting vehicle 34 is moved to the movable carriage 50.
The guide mechanism that guides in a direction perpendicular to the direction of movement is not limited to four grooves as illustrated, but as long as a sufficient guiding function can be achieved, a single groove or rail structure can be used. Etc. can also be adopted.

The connection form of the first hydraulic cylinder mechanism and the second hydraulic cylinder mechanism constituting the driving means for driving the mold mounting vehicle 34 may be in series, and for example, the first hydraulic cylinder mechanism may be the first hydraulic cylinder mechanism. It is also possible to connect the piston of the hydraulic cylinder mechanism with the piston of the second hydraulic cylinder mechanism.

Furthermore, the shape of the mold mounting portion 60 in the mold mounting vehicle 34 is not limited to the illustrated one, but may be changed according to the size and shape of the mounted mold.
It should be changed as appropriate.

Further, the driving means for driving the movable carriage 50 is not particularly limited, and an electric motor or the like may be used in addition to the hydraulic cylinder mechanism as illustrated.

In the above-described embodiment, a mold changing device used in a vertical rotary molding machine in which two sets of dies 20, 20 are mounted between the rotating platen 16 and the lower plate 12 is described. Although one specific example of the present invention is shown, the present invention is also advantageously applied to a mold changing device used in a vertical rotary molding machine to which three or more molds are mounted. It can be applied.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, various changes, modifications, improvements and the like can be implemented in an embodiment,
It goes without saying that all such embodiments are included within the scope of the present invention, without departing from the spirit of the present invention.

[0040]

As is apparent from the above description, in the mold exchanging device having the structure according to the present invention, the required stroke of each hydraulic cylinder mechanism is smaller than the moving amount required for the mold mounted vehicle. Since the amount can be set sufficiently small, even if the distance of the vehicle with the mold is long,
The operational and manufacturing problems caused by the imbalance between the relationship between the cylinder diameter and the stroke of the hydraulic cylinder mechanism can be advantageously solved, and the outward protrusion of the hydraulic cylinder mechanism can be advantageously suppressed. Thus, the device can be effectively made compact.

Therefore, in the mold exchanging apparatus according to the present invention, even when a long mold is used, or when a moving distance of a mold-equipped vehicle such as a large molding machine is large, the vertical direction is maintained. It can be applied very advantageously to a mold rotary molding machine.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing a specific example of a vertical rotary molding machine provided with a mold changing device as one embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a cross-sectional view corresponding to FIG. 2, showing a forward movement state (projection movement state) of a mold mounting vehicle in the mold changing apparatus shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Movable board 12 Lower board (fixed board) 16 Rotating surface plate 20 Mold 22 Upper mold 24 Lower mold 30 Lift member 34 Mold loading car 36 Positioning protrusion 44, 54 Groove rail 46 Base 48 Guide rail 50 Moving carriage 52 Moving bogie driving cylinder 58 Die loading vehicle driving means 60 Die loading part 68 First hydraulic cylinder mechanism 70 Second hydraulic cylinder mechanism

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B29C 33/00-33/76 B21D 37/04 B29C 45/26-45/44

Claims (1)

(57) [Claims] A fixed plate, and a movable plate arranged so as to be able to approach and separate from above the fixed plate, and a rotating platen is rotatably mounted on a surface facing the fixed plate, At least two sets of upper and lower dies attached to the rotating platen and the fixed platen are used in a vertical rotary molding machine which simultaneously clamps different combinations at a plurality of rotating positions of the rotating platen. A moving carriage arranged along the fixed plate so as to be able to reciprocate in one horizontal direction, and at least two mold mounting parts on which the mold is mounted. And mounted on the fixed carriage so as to protrude and retract from the fixed board in a direction perpendicular to the moving direction of the movable carriage, and mount the mold on the fixed board. A pair of dies to be guided to the position or taken out from the fixed platen And a first hydraulic cylinder mechanism and a second hydraulic cylinder mechanism connected in series to each other, and are interposed between the movable bogie and each of the mold-equipped vehicles. When the vehicle is driven in the protruding and retracting directions with respect to the fixed plate, and when the die-mounted vehicle is positioned at the retracting end side, the first and second hydraulic cylinder mechanisms are used for the die-mounted vehicle. And a pair of driving means which are positioned so as to overlap each other in the moving direction of the mold.