JPH05116208A - Detaching device of die-core for blow molding machine - Google Patents

Abstract

PURPOSE:To provide the title detaching device capable of rapidly replacing a die-core for change in the shape of moldings and change in the molding material. CONSTITUTION:A detaching device of a die-core for a blow molding machine is equipped with a transfer car 1 which is capable of placing at least one piece of die-cores 2, 3, 4 for detachment different in a shape thereon and of carrying the die-cores 2, 3, 4. between the placing position and the prescribed position of a blow molding machine main body 17 and with a device for attaching and detaching the die-cores 2, 3, 4, to/from the molding machine main body 17. When the die-core 3 is carried to the lower part of the blow molding machine main body 17 by the transfer car 1, a turning arm 13 is turned by a driving motor 14 of the turning arm and a rotary axis 16 and a die-core elevating/ lowering device 15 is positioned under the die-core 3 to attach this die-core 3 to the molding machine 17. In the case of detach the die-core, the transfer car free from the die-core thereon is positioned in the prescribed position of the molding machine main body 17 and operation reverse to the attachment operation is executed to detach the die-core.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die / core attaching / detaching device for a blow molding machine which performs molding by increasing air pressure using a hollow molten resin material.

[0002]

2. Description of the Related Art Conventionally, blow molding is performed by using a blow molding machine as shown in FIGS. 7 (a), (b), (c) and (d). That is, as shown in FIG. 7 (a), in the first step, a resin material such as high density polyethylene (HDPE) is used, and the resin material is extruded by the extruder 28, as shown in FIGS. 8 (a) and 8 (b). A hollow molten resin material (called a parison) 25 is extruded through the die 23 and the core 24 (parison extrusion). Next, as shown in FIG. 7 (b), in the second step, after the parison extrusion is completed, the cooling and molding dies are closed (mold closing). Next, as shown in FIG. 7, in the third step, a tube is inserted from the hollow of the parison 25 and air is blown from the air blowing port 29. The soft resin expands and deforms under the influence of this air pressure, comes into contact with the mold 26, and is fixed. The resin is cooled and solidifies into a molded product (air blowing, cooling). Finally, as shown in FIG. 7D, after cooling the molded product 27 in the fourth step, the closed mold 26 is opened to take out the molded product 27 as a product (product removal).

[0003]

However, in the blow molding machine used for such conventional blow molding, it is not easy to replace the die and the core, and therefore the shape of the molded product and the molding resin material are changed. In many cases, it took a lot of time and effort to replace the die core with a suitable one in each case. Further, even after the die core replacement work, the die core needs to be preheated, so that there is a problem that the formation cannot be performed during this period and the productivity is lowered.

[0004]

The present invention has been made by paying attention to the above problems to be solved in the related art, and the die core can be automatically attached / detached and quickly exchanged. It was found that the above problems can be solved by the above, and the present invention has been accomplished.

Accordingly, the present invention provides one or more detachable dies.
A transfer vehicle capable of mounting a core and transporting the die core between a mounting position and a predetermined position of the blow molding machine body, and a device for attaching and removing the die core to the molding machine body The present invention relates to a die / core attaching / detaching device for a blow molding machine.

In the die / core detaching device for the blow molding machine of the present invention, the die / core preheating device is installed in the die / core transfer vehicle to preheat the die / core while waiting, and to perform the molding immediately after the die / core replacement. It is preferable to be able to perform.
Further, it is preferable that the die core attached to the molding machine from the transfer vehicle is supplied with electric current from the connecting portion so that the main heating can be performed immediately.

[0007]

In the die core attaching / detaching device of the present invention, one or more attaching / detaching die cores can be mounted, and the die cores are transported between the mounting position and a predetermined position of the blow molding machine body. Since it is equipped with a transfer vehicle capable of mounting and removing the die core from the molding machine main body, the required die core is mounted on the transfer vehicle, preferably with a turntable attached, and the die core is mounted. To a predetermined position of the blow molding machine main body, where an attachment / detachment device, for example, a lifting / lowering bar equipped with a swing arm and a die / core lifting / lowering device having a connecting member are positioned and blown by the swing arm. It is possible to mount the conveyed die core at the die core position of the molding machine, retract the transport vehicle to the original position after the mounting is completed, and remove the die core by the reverse method if necessary. Kill.

[0008]

EXAMPLES The present invention will be described in detail below with reference to examples. FIG. 1 is a plan view showing an embodiment of a die / core attaching / detaching device of the present invention. In FIG. 1, a die / core transfer vehicle 1
Are removable A-type die cores 2 and B with different shapes.
Type die core 3, C type die core 4 and these dies
The turntables 5, 6 and 7 holding the core are mounted. The die / core transfer vehicle 1 is supported by a frame 11 having two rails 12 laid in parallel.
A blow molding machine body 17 is arranged above the die / core transfer vehicle 1, and a die / core lifting device 15 having a revolving arm 13 is provided below the blow molding machine body 17 (see FIG. 2).

The die / core transfer vehicle 1 is provided with wheels 8, a drive motor 9 and a gear 10 and is slidable in the arrow X direction via a rail 12 laid on the mount 11. The moving speed can be adjusted by the gear 10. Further, the revolving arm 13 is operated by a revolving arm drive motor 14 and is rotatably mounted around a rotating shaft 16 (that is, it can be rotationally displaced in the arrow Y direction).

FIG. 2 is a sectional view taken along line KK of the detaching device shown in FIG. 1 in which the revolving arm 13 is rotationally displaced. In FIG. 2, the die / core lifting device 15 includes a lifting bar 19, and a connecting member 20 having a pin 20a is provided on the top of the lifting bar 19. This connecting member 20 is
It can be moved up and down via the elevating bar 19, and the arrow Z
Can be rotated in the direction of. Die / core transfer vehicle 1
Between the inner peripheral wall of the turntable 6 and the outer peripheral wall of the turntable 6,
A bearing 18 is provided, which facilitates rotation of the turntable.

The connecting portion between the die core lifting device 15 and the turntable 6 of the die core attaching / detaching device 1 shown in FIG. 2 is shown in FIG.
Enlarged to show. In FIG. 3, the turntable 6 has a hole 6a at the bottom, and the pin 20a of the connecting member 20 on the top of the lifting bar 19 is fitted into the hole 6a to connect the turntable 6 and the die / core lifting device 15 to each other. The connection of is realized. In addition, the connecting portion between the turntable 6 and the detachable die core 3 of the die / core detaching / attaching apparatus 1 shown in FIG. 2 is shown in an enlarged manner in FIG. The die core 3 includes a detachable die 3a and a detachable core 3b, each having a die rotating hole 3c and a core rotating hole 3d. The turntable 6 has a die rotating pin 6b on the top.
And a core rotation pin 6c. These detachable dies
3a, core 3b, and pin 6b for rotating the die of turntable 6
By fitting the core rotation pin 6c and the core rotation pin 6c, respectively, the turntable 6 and the die core 3 are connected.

Next, FIG. 5 is an enlarged sectional view showing the upper part of the die core 3, the molding machine side die 21, and the lower part of the molding machine side core 22. As shown in the drawing, the detachable die 3a and the detachable core 3b are provided at their tops with projecting screw portions 3e and 3f, respectively, and external threads are provided at the outer periphery of the detachable die 3a and the detachable core 3b. Inner peripheral wall portions of the recesses corresponding to the protruding screw portions at the tops of the detachable die 3a and the core 3b
Female threads are provided on 21a and 22a. The detachable die core 3 and the blow molding machine main body 17 are connected to each other by screwing the male screw portion and the female screw portion.

Next, the preheating device for the detachable die cores 2, 3 and 4 will be described. For preheating of the detachable die, for example, the die 3a, a band (not shown) of an electric heater is provided on the outer peripheral wall of the die.
By mounting. In this case, when the die / core transfer vehicle 1 is on standby, an electric current is supplied from the die rotating pin 6b of the turntable 6. A current flows between the equipment main power supply and the turntable 6 via a slip ring. After mounting on the molding machine 17, current flows from the molding machine 17 via the contact surface (A portion in FIG. 5) between the detachment die 3a and the molding machine side die 21.

On the other hand, preheating of the detachable core, for example 3b, is carried out by incorporating an electric heater (not shown). In this case, when the transfer vehicle is on standby, an electric current is supplied from the core rotating pin 6c of the turntable 6. A current flows between the equipment main power supply and the turntable 6 via a slip ring. After being attached to the molding machine body 17, the contact surface between the detachable core 3b and the molding machine side core 22 (B portion in FIG. 5)
An electric current flows from the molding machine body 17 via the.

Next, a method of attaching the die core using the die core attaching / detaching apparatus of this embodiment will be described. An example of the mounting method is shown step by step in FIGS. 6 (a) to 6 (f). FIG. 6A shows a state in which the die core is not attached to the blow molding machine body 17. Next, the die core 3 selected as shown in Fig. 6 (b).
Is conveyed to a predetermined position of the blow molding machine main body 17 by the transfer vehicle 1. Next, as shown in FIG. 6 (c), the revolving arm 13 rotates the die / core lifting device 15 to set it at a predetermined position. Next, as shown in FIG. 6 (d), the elevating bar 19 is raised and, for example, the turntable 6 is caught and rotated to attach the detachable die core 3 to the molding machine body 17. Next in FIG.
As shown in (e), after attaching the die core, turn the swing arm again.
The drive motor 14 rotates the 13 to avoid the lifting device 15. Finally, as shown in FIG. 6 (f), the transfer vehicle 1 is evacuated, and the attachment of the die core is completed.

The method of removing the die core is shown in FIGS. 6 (a) to 6 (f).
The method shown in can be reversed. That is, a turntable not equipped with a die core is conveyed to the position of the detachable die core to be removed by a transfer vehicle, and the turning arm is rotated by a drive motor to set the die core lifting device at a predetermined position. .. Then, the elevating bar is raised, the turntable is caught and rotated, the die core is removed from the molding machine, and then the turning arm is rotated, and the elevating device is retracted.

In this embodiment, a plurality of die cores 2, 3 and 4 having different shapes are mounted on the transfer vehicle 1. Therefore,
It is possible to select an appropriate die core according to the shape of the molded product and the molding material. That is, in general, a large die core is suitable for molding a large molded product, and a small die core for molding a small molded product.
The core is appropriate. Further, when molding a resin material having a large swell ratio, a die core having a smaller size is suitable for a molded article having the same shape than a resin material having a small swell ratio. According to the present embodiment, this requirement can be satisfied quickly and easily.

[0018]

As described above, the die / core attaching / detaching device for the blow molding machine according to the present invention includes one or more attaching / detaching die / cores, preferably a die / core preheating device, a driving part, a turntable, etc. Since it is equipped with a die / core transfer vehicle that can mount and a device that attaches and detaches the die / core to / from the molding machine body, when the molding die changes or when the molding resin material changes, Since it can be quickly replaced with an appropriate die core and molded immediately, it not only improves the productivity of the molding machine, but also saves a lot of labor and time when replacing the die core. ..

[Brief description of drawings]

FIG. 1 is a plan view of a die / core attaching / detaching device for a blow molding machine according to an example of the present invention.

FIG. 2 is a cross-sectional view of a die / core detaching device and a blow molding machine main body in which the swivel arm is rotationally displaced and cut along the line KK in the detaching device of FIG.

3 is an enlarged perspective view of a connecting portion between a die / core lifting device and a turntable of the die / core attaching / detaching device shown in FIG.

FIG. 4 is an enlarged perspective view of a connecting portion between the turntable and the detachable die core of the die core detaching device shown in FIG.

FIG. 5: A detachable die for the die core detaching device shown in FIG.
FIG. 6 is a cross-sectional view of a connecting portion between a core and a die core on the molding machine side.

FIG. 6 (a) shows a die / core attaching / detaching device of the present invention.
In the explanatory diagram of the first step of attaching the core to the molding machine main body, there is no die / core to be attached to the lower portion of the molding machine main body. (B) In the explanatory diagram of the second step, the die The state where the core transfer vehicle has arrived is shown. (C) In the explanatory diagram of the third step, the state where the die / core lifting device has arrived at the lower part of the die core transfer vehicle is shown. In the explanatory diagram, the state that the die core is lifted and set in the die core on the molding machine side is shown. (E) In the explanatory diagram of the fifth step,
It shows the retracted state of the die / core lifting device after setting the core, and (f) is an explanatory view of the sixth step, showing the retracted state of the die / core transfer vehicle.

FIG. 7 (a) is an explanatory view of a first step in which blow molding is performed using a conventional blow molding machine, showing a state in which a parison is extruded from an extruder, and (b) a parison for cooling after extrusion is completed. FIG. 6C is an explanatory diagram of the second step in which the molding die is closed, (c)
It is explanatory drawing of the 3rd process of blow-molding a molded product from a parison, and (d) It is explanatory drawing of the 4th process of taking out a molded product from a metal mold | die after cooling.

8 (a) is a cross-sectional view of a die core of a conventional molding machine for molding a parison, and (b) A of the parison of FIG. 8 (a).
It is sectional drawing cut | disconnected by A '.

[Explanation of symbols]

 1 die / core transfer vehicle 2 A type die / core 3 B type die / core 3a Desorption die 3b Desorption core 3c Die rotation hole 3d Core rotation hole 3e Desorption screw top 3f Desorption Core projecting screw part 4 C type die core 5 turntable 6 turntable 6a turntable hole 6b die rotating pin 6c core rotating pin 7 turntable 8 wheels 9 drive motor 10 gear 11 frame 12 rail 13 Slewing arm 14 Slewing arm drive motor 15 Die / core lifting device 16 Rotating shaft 17 Blow molding machine body 18 Bearing 19 Elevating bar 20 Connecting member 20a Connecting member pin 21 Blow molding machine side die 21a Inner wall of die recess 22 Blow molding machine side Core 22a Core Inner wall of recess 23 Die 24 Core 25 Parison 26 Mold 27 Molded product 28 Extruder 29 Air inlet

Claims (1)

[Claims] 1. A transfer vehicle capable of mounting one or more detachable die cores and transporting the die cores between a mounting position and a predetermined position of a blow molding machine body.
A die core attaching / detaching device for a blow molding machine, comprising a device for attaching and detaching the die core to the main body of the molding machine.