JPH0642829Y2 - Blow molding equipment - Google Patents

Description

[Detailed Description of Device] a. Object of the Invention <Industrial Application Field> The present invention relates to a blow molding device having a die head part of a blow molding device, particularly a die ring part and a nozzle core replacement assist device.

<Prior Art> Generally, in a die head for a blow molding machine, the dimensions of the die ring and the core are determined by the molded product (mold). Therefore, in the case of high-mix low-volume production, the die ring and the core are frequently replaced. Done.

<Problems to be solved by the invention> In recent years, there has been a tendency to mold large molded products such as double-walled bathtubs and bumpers of automobiles by a blow molding device, which requires a great deal of labor and time for replacement work of die rings and nozzle cores. Is needed.

This invention provides a blow molding device equipped with a die head component replacement assisting device that enables safe and easy loading and unloading of die head components such as die rings by one person's work, and does not hinder blow molding. It is intended to be offered to the market.

B. Configuration of the Invention <Means for Solving the Problems> In order to solve the above problems, the present invention relates to a blow molding apparatus in which a blow molding die head is connected to a tip of a nozzle of an extrusion molding machine. The die head component replacement assisting device provided on the frame of the extruder is composed of a swing arm capable of reciprocally rotating in the horizontal direction and a jack device attached to the free end of the swing arm. The base of
The extruder frame is swingably supported around a vertical axis, and the swing arm has a storage position around the base portion along the extruder frame, a crane hanging position outside the die head, and The blow molding apparatus is selectively positionable between the non-use position and the use position directly below the die head, which is an intermediate position between the crane suspension position.

The jack device is a screw type jack, and a blow molding device in which a die head component supporting arm that extends radially and horizontally extends is attached to the upper and lower movable members of the jack device is a die head component, especially a die ring. It is suitable for replacement work.

The up-and-down movable member of the screw type jack is a blow molding device equipped with a ratchet mechanism provided on a manual operation lever to be screwed to a screw rod that is intermittently rotated around its axis so as to be vertically movable.

The die head component support arm is composed of two horizontally extending support pieces attached to the upper and lower movable members of the jack device with a common vertical pivot pin, and these support pieces have a use posture in which they cross each other in a cross shape, and mutually. The blow molding device is characterized in that the blow molding device is selectively set in an overlapping storage posture.

<Operation> Next, the operation of the present invention configured as described above will be described together with the method of using it.

(Assembling Work of Die Head Parts to Die Head Body of Die Ring) First, the swing arm in the die head part replacement assist device is pulled out from the storage position along the frame of the extrusion molding machine, passes under the die head, that is, outside the die head, that is, Swing around the base of the crane to the suspended position and position and fix it in this suspended position.

At this time, the die head component support arm of the jack device provided at the free end of the swing arm is in a lowered state, and the two support pieces are set in a posture of crossing in a cross shape.

The die ring to be attached to the die head is hung by a crane and placed on the two support pieces that are open at the hanging position.

Next, with the die ring placed on the jack device, the swing arm is swung to a position directly below the die head around the base vertical axis, and the position is fixed at this position.

In this state, the die head component supporting arm of the jack device is mechanically raised to lift the die ring to the assembling position of the die head body.

In this lifted state, the die ring is fastened to the die head body with a plurality of fastening bolts in a direction parallel to the axial direction of the die head body.

In place of the tightening bolt, a plurality of wedge bodies that can be reciprocally moved in the radial direction of the die ring by the operation of the fluid cylinder device may be used for mounting the die ring.

Before or after the work of attaching the die ring, a conical core is bolted to the lower end of the mandrel to obtain a desired die head.

When the jack device is used for mounting the core, a vertical pivot pin that mounts the two support pieces on the upper and lower movable members is used as a core centering pin to mount the core on the two support pieces. The core is placed, the jack device is moved, the core is transferred to the position just below the mandrel, and the core is attached to the lower end of the mandrel with the core aligned.

In this way, after the core of the blow molding die head and the die ring are assembled, the swing arm is swung about the vertical axis of the base from the position directly below the die head to the storage position along the frame of the extruder, Store and store in position.

At this time, the two support pieces of the die ring support arm are superposed on each other, aligned on the longitudinal axis of the swing arm, and in a posture parallel to the frame.

In this state, the mold clamping position in the retracted position is moved forward just below the blow molding die head, and after positioning and fixing, the molten parison is supplied from the die head into the open mold as usual, and then the mold is clamped to fix the parison in the mold. It is blow-molded and processed into a desired shape.

(Die Ring Removal Operation) When disassembling, repairing, and cleaning the die head thus assembled, the procedure is the reverse of the above assembly.

That is, set this jack device below the die ring,
Support from below the die ring. Next, when the die ring is removed from the die head, the die ring is placed on the jack device.

Next, lower the jack device slightly, then swing it to the crane suspension position, position the die ring outside the die head, and then use a crane, hoist, etc., to remove the die ring from the blow molding device. Repair and clean, and replace with a new caliber die ring.

On the other hand, before and after exchanging this die ring, remove the core,
Replacement is also performed, and the molten resin path inside the die head is cleaned with the core and die ring removed.

<Example> Next, a typical example of the present invention will be described.

In FIG. 1, A is a blow molding die head,
This die head A has a parison annular discharge port 10 at its lower end.
Has a conical core 11 and a die ring 12. The conical core 11 is detachably attached to the tip of the central mandrel 13 of the die head A by a bolt, and the die ring 12 is usually attached to the die head body 14. It is detachably fixed by the tightening bolt or the die locking device B described later.

Reference numeral C is a die head component exchange assisting device for exchanging the die ring 14, and the die head component exchange assisting device C is provided on the frame D1 of the extrusion molding machine D.

As shown in FIG. 2, the die head component replacement assisting device C comprises a screw type jack device 15 and a swing arm 16, and the jack device 15 is attached to a free end portion of the swing arm 16. .

The operation of the screw type jack device 15 is performed by the swinging operation of the driving lever 17, and the lever 17 is intermittently rotated by the operation of the lever 17 through a conventionally known ratchet mechanism (not shown) with two claws. The feed screw rod 18 is attached to the free end of the swing arm 16 so as to be rotatable around its axis, and is screwed onto the feed screw rod 18 to move only in the axial direction. A die ring support arm 20 extending in a radial direction is attached.

Even if the lever 17 described above is a ratchet spanner that can be attached to and detached from the screw rod 18, there is no change in this invention. The type of the ratchet is preferably a double-acting claw type or a type having a return preventing claw, but may be a single claw type or a friction type.

The tip (free end) of the swing arm 16, that is, the screw type jack device 15 is housed along the frame D1 outside the die head A, through the hanging position I of the die ring crane and the position II directly below the die head A. The base of the swing arm 16 is pivotally attached to the frame D1 of the extruder D by the vertical shaft 22 so as to move in a circular locus with respect to the storage position III (see FIG. 3).

The die-ring support arm 20 includes two horizontal support pieces of a cross shape.
20a, 20b. These supporting pieces 20a, 20b are arranged around a common vertical pivot pin 23 in a posture intersecting at a right angle when in use, and when not in use, they overlap each other and are set in parallel along the frame D1 of the extrusion molding machine D. As much as possible, it is relatively displaced and fixedly provided at that position (3rd
See figure).

The die locking device B includes a plurality (preferably about 10) of hydraulic cylinder devices 24, and these hydraulic cylinder devices 24 are arranged on the outer peripheral surface of the die head A at equal angular intervals.

The cylinder portion 25 of each hydraulic cylinder device 24 is bolted to the die head body 14, and the reciprocating movement direction of the piston rod 26 is the radial direction of the die ring 12, that is, the radial direction of the die head A. 26
A wedge body 28 formed on a tapered surface 27 whose upper surface becomes lower toward the inside is integrally attached to the tip end portion of each of the wedge bodies 28. It is slidable.

A chip piece 31 having on its lower surface a tapered surface 30 that can come into contact with the tapered surface 27 of the wedge 28 is detachably attached to a part of the lower end surface of the die ring 12 near the outer periphery.

The wedge body 28 can reciprocate between a forward tightening end where the tapered surfaces 27 and 30 abut against each other and a retracted open end where the abutment is released (see FIGS. 1, 4 and 4). (See FIG. 5).

The operation of the above embodiment will be described below.

First, the swing arm in the die head component replacement assisting device C
16 is pulled out from the storage position III along the frame D1 of the extrusion molding machine D, passes through the position II directly below the die head A, and is swung around the vertical axis 22 at the base thereof to the outside of the die head A, that is, the crane suspension position I. , The crane is positioned and fixed at the hanging position I.

At this time, the jack device 15 provided at the free end of the swing arm 16
The die head component support arm 20 is in a lowered state, and the two support pieces 20a and 20b are set in a posture of crossing in a cross shape.

The die ring 12 to be attached to the die head A is hung by a crane and placed on the two support pieces 20a and 20b which are open at the hanging position.

Next, with the die ring 12 placed on the jack device 15, the swing arm 16 is moved around the base vertical axis 22 of the die head A.
Swing to the position II directly below and position and fix at this position.

The lever 17 is swung in a horizontal plane, the feed screw rod 18 is intermittently rotated around its axis in one direction through a ratchet mechanism, and the support rod 19 screwed to the screw rod 18 is sequentially raised. Then, the die ring support arm 20 of the jack device 15 is raised, and the die ring 12 supported thereon is lifted to the assembly position of the die head body 14 (see FIG. 4).

Next, the respective hydraulic cylinder devices 24 are operated to extend the respective piston rods 26 and move the respective wedge bodies 28 at the tips of these rods 26 from the backward open end to the forward tightening end.

At these forward tightening ends, the tapered surface 27 of the wedge body 28 is pressed against the tapered surface 30 of the chip piece 31 attached to the die ring 12 on the support arm 20 and the wedge action of the wedge body 28 causes the die ring 12 to move.
The upper end surface of is pressed against the die head body 14 to be fixed.

At this time, in order to prevent the oil in the hydraulic cylinder device 24 from returning into the return oil passage, the switching valve is closed or a check valve or the like is provided.

Before or after mounting the die ring 12, the mandrel 13
To bolt the conical nozzle core 11 to the lower end, a vertical pivot pin 23 that attaches the two support pieces 20a and 20b of the jack device 15 to the upper end of the support rod 19 is used as a nozzle core centering pin. The nozzle core 11
After the nozzle core 11 is inserted into the central nozzle hole 11a, the nozzle core 11 is moved right below the mandrel 13 and aligned with the nozzle core 11, the nozzle core 11 is positioned at the lower end of the mandrel 13 and then bolted from below to integrally attach the nozzle core 11 to the lower end of the mandrel 13.

In this way, after the core die ring of the blow molding die head A is assembled, the swing arm 16 is moved from the position II directly below the die head A to the storage position III along the frame D1 of the extruder D.
It is swung around the vertical axis 22 and stored and stored in this position.

At this time, the two support pieces 20a and 20b are superposed on each other and aligned on the longitudinal axis 0 of the swing arm 16, and
The posture is parallel to D1.

In this state, the mold clamping device (not shown) in the retracted position is moved forward just below the blow molding die head A to position and fix it, and then the extrusion molding machine D is operated to operate the annular discharge port 10 of the die head A as usual. From a molten parison (not shown)
Is fed into a lower open mold (not shown), then clamped and the parison is blow molded in the mold to the desired shape.

When disassembling the die head A for repair and cleaning, the procedure is the reverse of the above assembly.

Further, when the taper surface 30 of the tip piece 31 or the taper surface 27 of the wedge body 28 is worn out due to long-term use and becomes unusable, the die piece 12 or the tip piece 16 or the piston rod 26 or the wedge body is used. Remove 28 and replace with a new one.

C. Effect of the Invention Since the jack device in the blow molding device of the present invention configured and acting as described above is retracted from right under the blow head and is stored and stored in parallel along the frame of the extrusion molding machine during normal blow molding. , The blow molding is not hindered, and when the die ring is replaced or assembled, the swing arm is pulled out as described above and moved between the crane suspension position and directly below the die head, so that the die ring and the core are moved to the die head main body, It can be easily carried in and out of the mandrel.

The jack device is a screw type jack, and in the case of a blow molding device in which a radially extending die head component supporting arm is attached to the upper and lower movable members of the jack device, a special jack for operating the jack device is used. No need for air pressure or hydraulic pressure source, no noise, and small size of the jack device, and the die ring supported by the support arm can be moved up and down with respect to the die head body by the action of the screw type jack. .

In the case of a blow molding apparatus in which the vertically movable member of the screw type jack is equipped with a screw rod that is intermittently rotated around its axis through a ratchet mechanism provided on a manual rotation operation lever so as to be vertically movable. Is a die ring with a load,
The core can be slowly moved up and down with respect to the die head body and mandrel by manually operating the lever, and the core can be attached and detached without dropping.

The supporting arm is composed of two horizontally extending supporting pieces attached to the upper end of the vertically movable member of the jack device by a common vertical pivot pin, and these supporting pieces mutually overlap with each other in a crossing-like use posture. In the case of a blow molding device that can be selectively set in a non-use posture, the die ring and the core can be stably supported by the two support pieces that open and cross in a cross shape when the die ring is carried in and out. Furthermore, when not using this die head component replacement auxiliary device,
These support pieces can be overlapped and stored and stored in parallel with the swing arm along the frame of the extruder, and the mold clamping device can be moved directly below the die head without any trouble to shift to blow molding processing.

Further, by combining with the die locking device shown in the embodiment, it is possible to shorten the time for attaching and detaching the die ring to the die head body.

<Effects peculiar to the embodiment> In a mode in which the upper end of the pivot pin 23 of the above embodiment is projected upward and the pivot pin 23 is used as the core alignment pin of the nozzle core 11, the central nozzle hole in the nozzle core 11
The upper end of the pin 23 is inserted into 11a, and the nozzle core 11 is supported by the support arm 20 so that it is carried in and out of the lower end of the mandrel 13, and the die head component replacement assisting device C for replacing the die ring 14 is installed in the nozzle core 11. Can also be used for installation and removal work.

[Brief description of drawings]

FIG. 1 relates to the present invention, FIG. 1 is a schematic view of a die head portion for a blow molding device of an embodiment of the present invention, and FIG. 2 is an example of a die head part replacement assisting device used at the time of this assembly and disassembly. FIG. 3 is a partially broken side view showing the same, FIG. 3 is a plan view thereof, and FIGS. 4 and 5 are views showing a process of assembling the die ring to the die ring body. Explanation of main symbols in the figure 15: Jack device.

Claims (4)

[Scope of utility model registration request] 1. A blow molding apparatus in which a blow molding die head is connected to a nozzle tip of an extruder, wherein a die head component replacement assisting device is provided on a frame of the extruder, and the die head component replacement assisting device is horizontal. It consists of a swing arm that can be reciprocally rotated in any direction, and a jack device that is attached to the free end of this swing arm, and the base of the swing arm can swing around the vertical axis of the frame of this extruder. The swing arm is supported by a storage position along the frame of the extruder around its base, a crane suspension position located outside the die head, and directly below the die head that is intermediate between the storage position and the crane suspension position. The blow molding apparatus is characterized in that it can be selectively positioned with respect to the use position thereof. 2. The utility model registration as claimed in claim 1, wherein the jack device is a screw type jack, and a die head component supporting arm extending radially and horizontally is attached to an upper end of a vertically movable member of the jack device. Blow molding equipment. 3. A utility model in which the vertically movable member of the screw type jack is screwed with a screw rod which is intermittently rotated around its axis through a ratchet mechanism provided on a manual operation lever so as to be vertically movable. The blow molding apparatus according to claim 1. 4. The die head component support arm comprises two horizontally extending support pieces mounted on the upper end of the vertically movable member of the jack device by means of a common vertical pivot pin, and these support pieces cross each other in a cross shape. The blow molding apparatus according to claim 1, wherein the utility model is registered so that it can be selectively set in a posture and a storage posture in which the postures overlap each other.