JPH0569477A - Air blowing device in hollow molding machine - Google Patents

Abstract

PURPOSE:To easily supply air into a parison without depending on the sense of an operator by especially performing the vertical movement of an air blowing nozzle by a motor. CONSTITUTION:The air blowing device of a hollow molding machine is constituted so that air is supplied into a parison 7 held in the inside of a mold 6 via an air blowing nozzle 5 by vertically moving this air blowing nozzle 5 via a motor 30 and hollow molding of the parison is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air blowing device for a blow molding machine, and more particularly, by vertically moving an air blowing nozzle by a motor, without depending on the feeling of the operator.
The present invention relates to a new improvement for easily and highly accurately supplying air into a parison.

[0002]

2. Description of the Related Art There are various types of air blowing devices for a blow molding machine of this type that have been conventionally used. Typical ones of them are generally used as shown in FIGS. 4 to 6. Another configuration can be cited. That is, in FIGS. 4 to 6, what is indicated by reference numeral 1 is a fixed portion, and the piston 3 of the hydraulic device 2 provided on the fixed portion 1 is hung from the air blowing nozzle 5 via the rod 4. Are provided. A mold 6 composed of a pair of openable mold parts 6a and 6b is disposed below the air blowing nozzle 5, and the cavity 6 of the mold 6 is disposed.
A molded cylindrical parison 7 is located in A.
The air blowing nozzle 5 is held by a pair of holding plates 22 and 23 held by the fixing portion 1 via a guide bar 21.

The hydraulic system 2 includes a pair of throttle valves 8a,
A solenoid valve 9 for controlling an oil passage is connected via 8b and a pair of oil passages 10a, 10b. Switching of this solenoid valve 9 causes the piston 3 in the hydraulic device 2 to descend, and the air blow nozzle 5 The part can be inserted into the parison 7 after the mold is closed, and air from an air source (not shown) can be supplied into the parison 7.

After the air supply to the parison 7 is completed and the hollow molding is completed, the air blowing nozzle 5 is raised through the hydraulic device 2 and the molded product can be taken out from the mold 6 after the mold is opened.

[0005]

Since the air blower of the conventional blow molding machine is constructed as described above, the following problems exist. That is, the speed at which this air-blowing nozzle is inserted into the parison is determined by the flow rate of oil supplied to the hydraulic device, but since this oil flow rate is determined by each throttle valve via the hydraulic device, it may depend on changes in oil temperature, etc. This speed changes, and it is difficult to obtain reproducibility for each molded product, and in reality, it depends on the feeling of the operator. Also. Depending on the shape of the molded product and the type of resin, the operator must change the speed to make the optimum condition and make an effort to perform high quality molding, and if it is not an experienced operator, a high quality molded product will be obtained. It was impossible.

The present invention has been made to solve the above problems, and in particular, by vertically moving an air blowing nozzle by a motor, the air can be moved into the parison without depending on the feeling of the operator. An object of the present invention is to provide an air blowing device for a blow molding machine that facilitates air supply.

[0007]

An air blower for a blow molding machine according to the present invention is configured to supply air through an air nozzle into a parison held in a mold to blow mold the parison. In the air blowing device of the blow molding machine, the air blowing nozzle is moved up and down via a motor.

More specifically, the motor is of a variable speed type, and its operation is stored and controlled by the controller.

More specifically, a toggle mechanism for bending in a dogleg shape is provided between the air blowing nozzle and the motor.

[0010]

In the air blower of the blow molding machine according to the present invention, when the motor is operated, the air blow nozzle moves up and down in conjunction with the operation of the motor, and the air blow nozzle is lowered and inserted into the parison. can do.
Therefore, by storing the conditions under which an optimum molded product is molded in the control unit that operates this motor, the insertion speed of this air blowing nozzle can be completely reproduced by memory control. It does not require such an experienced operator, and even a novice operator can always form a complete molded product.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of an air blowing device for a blow molding machine according to the present invention will be described in detail below with reference to the drawings. It should be noted that the same or equivalent parts as those of the conventional example will be described by attaching the same reference numerals. 1 to 3 are for showing an air blowing device of a blow molding machine according to the present invention. FIG. 1 is a schematic configuration diagram, FIG. 2 is a configuration diagram showing details of essential parts of FIG. 1, and FIG.
FIG. 2 is a configuration diagram showing details of FIG. 1.

A reference numeral 1 in FIG. 1 is a fixed portion, and a rotary shaft 30a of a variable speed type motor 30 provided in the fixed portion 1 and connected to a control portion 40 is bent in a dogleg shape. It is connected to the first operating piece 31 a of the toggle mechanism 31.

The first actuating piece 31a is connected to the second actuating piece 31b through the first shaft supporting portion 32, and each of the actuating pieces 31a.
Reference characters a and 31b constitute the toggle mechanism 31 which is bent in a V shape and has a decelerating action.

The second actuating piece 31b includes a second shaft supporting portion 33.
The air blowing nozzle 5 is connected to the rod 4 of the air blowing nozzle 5 by means of the toggle mechanism 31, and the air blowing nozzle 5 is configured to move up and down in the direction of arrow A. The air blowing nozzle 5 is configured to be supplied with compression air from an air source (not shown). Further, instead of the toggle mechanism 31, another deceleration type feeding mechanism such as a rack and a pinion is used. It can also be used.

At a position below the air blowing nozzle 5,
A mold 6 including a pair of openable and closable mold parts 6a and 6b is provided, and a molded cylindrical parison 7 is located in a cavity 6A of the mold 6.

The motor 30, the toggle mechanism 31 and the air blowing nozzle 5 are constructed in detail as shown in FIGS. 2 and 3. That is, below the fixing portion 1 in FIGS. 2 and 3, an auxiliary fixing portion 1A integrally connected through a plurality of tubular brackets 50 is provided, and in each of the tubular brackets 50. A guide bar 21 is provided so as to be vertically movable, and a guide plate 52 and a holding plate 23 are fixed to both ends of each guide bar 21 via nuts 53.

On the lower surface 23a of the holding plate 23, the air blowing nozzle 5 is provided so as to hang down, and between the upper surface 23b and the lower surface 1a of the fixed portion 1, the toggle mechanism 31 is attached. This toggle mechanism 31
The rotary shaft 30a of the motor 30 is attached to the first operating piece 31a of
Is fixedly connected.

The first operating piece 31a is attached to the first mounting portion 55 provided on the lower surface 1a of the fixed portion 1 on the rotary shaft 30.
The second operating piece 31b is rotatably attached via a, and the second operating piece 31b is rotatably attached via a pin 57 and a second attaching portion 56 provided on the upper surface of the holding plate 23.

The motor 30 is fixedly provided on an L-shaped bracket 58 fixed to the side portions of the fixed portion 1 and the auxiliary fixed portion 1A, and a control portion 40 having a built-in memory (not shown). It is configured to be memory controlled by.

Next, the case where the air blowing device of the blow molding machine according to the present invention constructed as described above is operated will be described. First, the mold 6 is opened, the cylindrical parison 7 extruded from a molding machine (not shown) is positioned in the cavity 6A of the mold 6, and the motor 30 is closed with the mold 6 closed. Is operated, the operating pieces 31a and 31b of the toggle mechanism 31 are changed from the dogleg shape to the linear shape (shown by the dotted line and the solid line in FIG. 2), and the holding plate 23 is also blown from the dotted line to the position shown by the solid line in FIG. The nozzle 5 descends together, and its tip 5a is inserted into the upper end of the parison 7 to complete the driving.

In the above-mentioned state, the air source (not shown)
The compressed air is supplied from the inside to the parison 7, and the mold 6 is hollow-molded. After this hollow molding is performed, the mold 6
When the mold is opened, the hollow molded product can be taken out.

Further, the insertion (driving) speed of the air blowing nozzle 5 by the motor 30 is previously stored in the memory (not shown) of the control unit 40 by taking in optimum data depending on the shape of the molded product, the type of resin and the like. The rotation speed of the motor 30 is freely stored and controlled by the data stored in the memory to adjust the speed. Therefore, it is necessary for the operator to rely on feeling as in the conventional operation. No
Optimal insertion can be performed only by operating the switch.

[0023]

Since the air blowing device of the blow molding machine according to the present invention is constructed as described above, the following effects can be obtained. In other words, since the driving speed of the air blowing nozzle into the parison is controlled by a motor that can control the memory, it is not necessary to rely on the feeling of the operator as in the past, and the driving that is optimal for the shape and material of the parison is performed. It can be performed. Further, the upward and downward speed of the air blowing nozzle can be set and controlled finely and freely, and the driving operation can be performed with a much higher precision than the conventional one. Further, the descent time of the air blowing nozzle can be shortened, and the drawdown of the molded product can be prevented. Furthermore, once a good product is molded and this data is stored, even a beginner can easily mold a good product, and the yield is greatly improved by shortening the setup time and reducing initial defects. be able to.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an air blowing device of a blow molding machine according to the present invention.

FIG. 2 is a configuration diagram showing an enlarged main part of FIG. 1 in detail.

FIG. 3 is a configuration diagram showing the configuration of FIG. 1 in detail.

FIG. 4 is a schematic configuration diagram showing an air blowing device of a conventional blow molding machine.

FIG. 5 is a configuration diagram showing in detail an enlarged main part of FIG.

FIG. 6 is a configuration diagram showing in detail an enlarged configuration of a main part of FIG.

[Explanation of symbols]

 5 Air blow nozzle 6 Mold 7 Parison 30 Motor 31 Toggle mechanism 40 Control unit

Claims (3)

[Claims] 1. A hollow structure in which air is supplied into a parison (7) held in a mold (6) through an air blowing nozzle (5) to hollow mold the parison (7). In the air blowing device of the molding machine, the air blowing nozzle (5)
An air blowing device for a blow molding machine, characterized in that it is configured to move up and down via a motor (30). 2. The blow molding machine according to claim 1, wherein the motor (30) is of a variable speed type, and the operation of the motor (30) is memory-controlled by the controller (40). Air blowing device. 3. The air blowing nozzle (5) and the motor (30)
The air blower for a blow molding machine according to claim 1 or 2, characterized in that a toggle mechanism (31) for bending in a dogleg shape is provided between them.