JPH06226826A - Method and apparatus for clamping molds of hollow molding machine - Google Patents

Abstract

PURPOSE:To shorten an arranging time without using oil, to facilitate a process management and to improve quality of a product by opening/closing molds by switching motor, and clamping the molds by a rotary hook and a stationary hook to be operated by a mold clamping motor independent from that for the opening/closing. CONSTITUTION:The apparatus for clamping molds clamps first, second molds 5, 6 for constituting molds 7 by holding a parison 11 suspended from a cross head 10 by the molds 5, 6. The apparatus comprises slide nuts 38, 39 for opening/closing the molds 7, and rotary screws 34, 35 for rotating switching motors 30, 31 for moving the nuts. The apparatus also comprises a stationary hook 22 provided at the mold 5 side, and a rotary hook 23 provided at the mold 6 side and to be rotated by a mold clamping motor 60. The hook 23 is engaged with the hook 22 to clamp the molds. Further, the hook 23 is rotated by a nut holder 63 to be telescoped by the motor 60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold clamping method and device for a hollow molding machine, and more particularly, to open and close a mold with an opening and closing motor, and mold clamping is performed with a mold clamping motor and a rotary hook. A new improvement for doing with a fixed hook.

[0002]

2. Description of the Related Art Conventionally, the structure shown in FIG. 5 has been adopted as a mold clamping method and device for a hollow molding machine of this type that has been conventionally used. That is, in FIG. 5, the reference numeral 1 is a frame whose cross-sectional shape is U-shaped,
First and second mold mounting plates 2 and 3 are provided at both end positions in the frame 1 so as to be linearly movable via a guide member 4, and the inner surfaces of the respective mold mounting plates 2 and 3 are provided with the first and second mold mounting plates 2 and 3. 1st and 2nd
Mold parts 5 and 6 are provided, and a mold 7 is formed by each mold part 5 and 6.
Are configured.

First and second side portions 1a, 1 of the frame 1
First of the first and second hydraulic cylinders 8 and 9 provided in b,
The second rods 8a and 9a are connected to the respective mold parts 5 and 6 so that the mold parts 5 and 6 can be opened and closed in the directions of the arrows. The hydraulic cylinders 8 and 9 are connected to a hydraulic unit 15 via a pair of throttle valves 12 and 13 and a solenoid valve 14, and the hydraulic cylinders 8 and 9 open and close and close the mold 7. Is configured to do.

Next, the operation will be described. The resin extruded from the extruder (not shown) is used for accumulator head 1
After storing a certain amount at 0, the pipe-shaped parison 11 is injected downward, guided between the molds 7 standing by at the lower part, and after being injected to a required length, the mold 7 is closed to close the parison 11 to the mold 7.
Hold by sandwiching and enclosing air in the parison 11 from above or below the mold 7 through a blow nozzle (not shown), and blow the parison 11 into the shape processed into the mold 7 to heat resin. Cool and solidify and mold.

[0005]

Since the conventional mold clamping method and device for the hollow molding machine are configured as described above,
The following issues existed. (1) If oil leaks from the hydraulic cylinders and pipes, not only is the molded product soiled and defects occur, but also the floor surface is dirty and slippery, which is not preferable for safety. (2) For the convenience of molding, at the intermediate stop where the mold is half-opened or half-closed, the position accuracy cannot be obtained due to the accuracy and leakage of hydraulic equipment, and the mold stops due to the influence of back pressure etc. There were many malfunctions such as moving inward, which was not preferable in terms of molding, and safety was insufficient. (3) Since the pump motor (not shown) in the hydraulic unit operates during mold clamping, energy consumption is large. Also,
In terms of obtaining the mold clamping force and the mold clamping speed by the flow of oil, the efficiency is poor and the energy saving is reversed. (4) The mold opening and closing speed changes due to the change in oil temperature.
Since the stop position varies, the quality of the molded product becomes uneven and defects occur. Warming up (preheating) is performed to prevent such a problem, but energy loss increases. Also, the temperature of the oil is forcibly raised by the heater, but the oil easily deteriorates and
The cost was increased by installing the heater. (5) In addition, maintenance due to oil leakage requires a great deal of labor (reinforcement of piping, replacement of packing and gasket, replacement of oil) and cost.

The present invention has been made to solve the above problems, and in particular, the opening and closing of the mold is performed by an opening and closing electric motor, and the mold is clamped by a mold clamping electric motor, a rotation hook, and An object of the present invention is to provide a mold clamping method and device for a hollow molding machine, which is performed with a fixed hook.

[0007]

According to a method of clamping a hollow molding machine according to the present invention, a parison hanging from a cross head is held by first and second mold portions constituting a mold and clamped. In the mold clamping method of the blow molding machine described above, the mold is opened and closed by a motor for opening and closing, and the mold is clamped by a rotary hook and a fixed hook which are operated by the motor for mold clamping.

A mold clamping device for a hollow molding machine according to the present invention is a mold for a hollow molding machine in which a parison hanging from a crosshead is held by first and second mold parts constituting a mold and clamped. In the tightening device, a slide nut for opening and closing the mold, a rotary screw rotated by an opening and closing electric motor for moving the slide nut, a fixed hook provided in the first mold part, and the second It is provided with a rotating hook which is provided in a mold part and which is rotated by a mold clamping electric motor, and the mold is clamped by engaging the rotating hook with the fixed hook.

More specifically, the rotating hook is configured to be rotated by a cam body that is inserted into and removed from the mold clamping electric motor.

[0010]

In the method and apparatus for clamping a hollow molding machine according to the present invention, the parison hanging from the crosshead is actuated by the opening / closing motor to close the first and second mold parts of the mold. It is sandwiched and held. At the time of mold closing of each mold part, the rotary hook lifted by the mold clamping electric motor is lowered to the fixed hook of the first mold part through the mold clamping electric motor to fix the rotary hook. After connecting to the hook,
When the mold clamping electric motor is rotated again, the rotating hook attracts the fixed hook, and the mold parts are clamped. By injecting air from an air nozzle (not shown) into the parison during this mold clamping step, a hollow molded product can be obtained in the mold.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a mold clamping method and apparatus for a hollow molding machine according to the present invention will be described in detail below with reference to the drawings. In addition, the same or equivalent portions as those of the conventional example will be described using the same reference numerals. 1 to 4 show a mold clamping device applied to a mold clamping method of a hollow molding machine according to the present invention.
1 is a configuration diagram showing the overall configuration, FIG. 2 is an enlarged cross-sectional view showing the rotating hook of FIG. 1, FIG. 3 is a front view showing the operating state of FIG. 2, and FIG. 4 is a mold opening / closing drive unit of FIG. It is a block diagram which shows another example.

A reference numeral 1 in FIG. 1 is a base, and a first rail 20 provided on an upper portion of the base 1.
A first slide frame 2A provided with a first die mounting plate 2 having a first die part 5 integrally formed thereon is provided slidably in a horizontal direction, and a second die is provided on a second rail 21. A second slide frame 3A provided with a second type mounting plate 3 integrally having a portion 6 is slidably provided.

The first die mounting plate 2 is provided with a plurality of fixed hooks 22 having a hook shape, and the second die mounting plate 3 is provided with a nut holder 6 having a rotatable hook 23.
3 is provided.

A first opening / closing electric motor 30 and a second opening / closing electric motor 31 are provided at both end positions of the base 1, and each of the electric motors 30 and 31 includes a pair of bearing supports 3.
First and second rotary screws 3 rotatably provided on the second and third screws 33.
4 and 35 are configured to rotate via couplings 36 and 37, and first and second slide nuts 38 and 39 are movably screwed to the rotary screws 34 and 35, respectively.

Recessed portion 3 of each slide nut 38, 39
8a and 39a have first and second engaging pieces 40 and 41 provided at the lower ends of the slide frames 2A and 3A.
Of the slide nuts 38, 39 engaged with the engagement pieces 40, 41 are larger than the size of crimping the parison 11 with the hooks 22, 23. Is set to.

The turning hook 23 is constructed as shown in FIGS. 2 and 3, and the second die mounting plate 3 has a generally U-shaped planar shape, and has an inclined surface 50a and a horizontal surface 5.
A guide support 50 having 0b is attached via a bolt 51, and a slide bearing 53 is attached to a bearing support 52 provided at a rear portion of the guide support 50.
The nut 54 is slidably provided on the slide bush 55 via the.

A rotary screw 62 screwed into the nut 54.
Is connected to a rotary shaft 61 of a mold clamping electric motor 60 provided at the rear end of the guide support 50 via a coupling 56 and a bearing holding nut 57.

At the tip of a nut holder 63 formed at the tip of the nut 54, the turning hook 23 is rotatably provided via a bearing 64 and a pin 64A, and the lower end of the turning hook 23. The pair of guide rolls 65 provided in the above are configured to slide on the inclined surface 50a and the horizontal surface 50b of the guide support 50.

Next, the operation will be described. First, when closing the mold 7, the couplings 36 and 37 and the rotating screws 34 and 35 are rotated by the opening / closing electric motors 30 and 31,
The slide nuts 38 and 39 are fed in the mold 7 closing direction. The engaging piece 4 directly connected to the slide frames 2A and 3A in one of the recesses 38a and 39a of the slide nuts 38 and 39.
0, 41 hit and the slide frames 2A, 3A, the mold mounting plate 2, by the pushing force of the slide nuts 38, 39.
3. The mold 7 slides on the rails 20 and 21 in the closing direction.

Next, before the die 7 crimps the parison 11, the fixed hook 22 is engaged with the rotary hook 23 to crimp the parison 11, and the die 7 is pressed by the air pressure enclosed in the parison 11. Hold the mold so that it will not open. The operation of the hooks 22 and 23 described above is performed by the mold clamping electric motor 60 as shown in FIGS.
When the nut holder 63 directly connected to the nut 54 is moved to the mold clamping motor 60 side by turning 2, the guide roll 65 attached to the side surface of the rotating hook 23 moves the inclined surface 50a of the guide support 50 to rotate it. The moving hook 23 has a pin 23a.
And the bearing 64, the claw 23b of the rotary hook 23 is hooked on the claw 22a of the fixed hook 22, the nut 54 and the nut holder 63 move, and the holding force required for blowing is applied to the rotary hook 23. The opening of the mold is the opposite of the above.

Further, in order to move the slide frames 2A and 3A, the two electric motors 30 and 31 in FIG. 1 may be interlocked, but as shown in FIG. 4, one electric motor 30 for opening and closing is used.
And the speed reducer 30A.

[0022]

The method and apparatus for clamping a hollow molding machine according to the present invention are configured as described above, so that the following effects can be obtained. That is, (1) since oil is not used, it is possible to prevent stains on the molded product, and work time for maintenance such as tightening due to oil leakage, oil replacement, packing, gasket replacement, etc. is unnecessary. (2) There is no dirt on the floor due to oil leaks, and safe work is possible without slipping during work. (3) By controlling the electric motor programmatically, the mold can be stopped at any speed and any position, and it can be stopped accurately, and there is no malfunction due to disturbance even during the stop, and it is safe. (4) After the mold is opened and closed, the motor is turned off except for the required operation, thus saving energy. (5) Since the tie barless structure can be used, the cost can be significantly reduced. (6) The mold clamping force can be changed arbitrarily by controlling the torque of the motor.Therefore, the mold clamping force according to the molded product can be used to prevent damage to the mold and improve the service life. Extremely improved. (7) Clamping force, opening / closing speed, stop position can be stored,
Since the molding conditions can be reproduced, it is possible to shorten the setup time, cover the operator's lack of skill, and improve quality control. (8) Since it is an electric motor operation, noise reduction is possible.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an apparatus applied to a mold clamping method of a hollow molding machine according to the present invention.

FIG. 2 is an enlarged cross-sectional view showing the turning hook of FIG.

FIG. 3 is a front view showing the operation state of FIG.

FIG. 4 is a configuration diagram showing another embodiment of the mold opening / closing drive unit of FIG. 1.

FIG. 5 is a configuration diagram showing a mold clamping device of a conventional hollow molding machine.

[Explanation of symbols]

 5,6 First and second mold parts 7 Mold 10 Crosshead 11 Parison 22 Fixed hook 23 Rotating hook 30,31 Opening / closing electric motor 34,35 Rotating screw 38,39 Slide nut 60 Mold clamping electric motor 63 Nut holder

Claims (3)

[Claims] 1. A parison depending from a crosshead (10).
A mold clamping method for a hollow molding machine, wherein (11) is clamped by holding first and second mold parts (5, 6) constituting a mold (7), wherein the mold (7) Opening and closing is performed with the opening and closing electric motor (30, 31),
A mold clamping method for a hollow molding machine, characterized in that the mold (7) is clamped through a rotary hook (23) and a fixed hook (22) operated by a mold clamping electric motor (60). 2. A parison depending from a crosshead (10).
A mold clamping device of a hollow molding machine, wherein (11) is held by first and second mold parts (5, 6) constituting a mold (7) and clamped, Slide nuts (38,3
9), a rotating screw (34, 35) rotated by an opening / closing electric motor (30, 31) for moving the slide nut (38, 39), and provided on the first mold part (5) side. A fixed hook (22) and a rotary hook (23) provided on the second mold part (6) side and rotated by a mold clamping electric motor (60) are provided, and the fixed hook (22) is provided with the rotary hook (23). A mold clamping device for a hollow molding machine, characterized in that the mold is clamped by locking a moving hook (23). 3. The mold for clamping is the rotating hook (23).
The mold clamping device for a hollow molding machine according to claim 2, wherein the nut holder (63) that moves in and out of the mold (60) is rotated.