JPH06287900A - Rotary mold forming machine - Google Patents

Abstract

PURPOSE:To provide a rotary mold forming machine capable of increasing the design freedom of product. CONSTITUTION:The rotary mold forming machine 1 is composed of a forming machine main body 3 and an upper mold supplying apparatus 5. The forming machine main body 3 is composed mainly of a rotor 7, forming molds 9a, 9b, 9c, 9d, a pressure-regulation part 11 and a pulp tank 13 and the upper mold supplying apparatus 5 is composed mainly of four upper molds 15a, 15b, 15c, 15d and an upper mold transfer apparatus 17. The rotor 7 is intermittently rotated by a rotation driving apparatus 6. The forming mold 9c in the pulp liquid 13a performs suction forming, reaches the position opposite to the upper mold 15c by the rotation of the rotor 7 and performs a press-forming when the rotor 7 is stopped. Since the press-forming operation is carried out with the forming mold and the upper mold in stopped state, the draft for releasing the formed article can be decreased and the design depth of the article can be increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary molding machine for producing a paper molded product from pulp liquid.

[0002]

2. Description of the Related Art Conventionally, a non-rotating type and a rotary type are known for a molding machine depending on the molding method. Molding dies and upper dies used in conventional non-rotary and rotary mold forming machines are shown in FIGS. 5 (A) and 5 (B), respectively. The draft angle θ1 of the non-rotating upper mold 101 and the molding mold 102,
Draft angle θ2 of the rotary upper mold 111 and the molding mold 112
Is θ1 <θ2. Also, the non-rotational depth d
1 and the rotary depth d2 are d1> d2.

In the non-rotating type, since the suction molding and the mold release are stopped, the suction molding can be surely performed, and the upper mold 1
Since 01 moves in the vertical direction, the draft θ1 of the product may be very small, and is suitable for producing a large product having a deep depth d1. On the other hand, the rotary type is suitable for mass-producing the same product. In this rotary type, when the molded product is released from the mold, it is necessary to instantaneously release the molded product while rotating the upper die 111 and the molding die 112. Therefore, a large draft θ2 of the product is required. As a result, the product is suitable for a relatively thin product having a shallow depth d2 and is suitable for producing a small product.

[0004]

However, the non-rotating type has a drawback that the productivity is inferior to that of the rotating type. Further, in the conventional rotary type, it was difficult to produce a large-sized product having a large depth due to the draft.

Further, in the conventional rotary type, it was not possible to obtain various kinds of molded products at the same time due to the steps performed during one rotation. The present invention, in order to solve the above problems,
It is an object of the present invention to provide a rotary mold forming machine capable of increasing the degree of freedom in product design.

[0006]

In order to solve the above-mentioned problems, a rotary molding machine according to the present invention comprises a rotary body having a molding die provided on an outer peripheral surface thereof and rotatably supported by the rotary body. The part is immersed in a pulp tank, and an upper die supply device that supports an upper die adapted to the surface shape of the forming die so as to be vertically movable with respect to the forming die, and the forming die is immersed in the pulp tank. When the first step of sucking the surface of the molding die,
When the molding die faces the upper die, the upper die is lowered and pressed onto the molding die, then the surface of the upper die is sucked and air is discharged from the surface of the molding die, and then the upper die is In a rotary molding machine that repeatedly performs the second step of rising from the molding die, the molding die is composed of one or more types, and further, while rotating the rotating body,
The gist of the second step is to provide a rotation drive device for stopping the rotation of the rotating body.

[0007]

The rotary molding machine of the present invention having the above-mentioned structure is
It works as follows. When the rotary body is rotated by the rotary drive device and the mold is immersed in the pulp liquid, the surface thereof sucks the pulp liquid. As a result, the pulp liquid adheres to the surface of the molding die and is suction-molded (first step).

Thereafter, when the rotating body further rotates and reaches the facing position where the molding die faces the upper die, the rotating body is stopped by the rotation driving device. Then, the second step is performed while the rotating body is stopped. That is, first, the upper die is lowered into the forming die and pressed. As a result, the suction-molded pulp liquid becomes a molded product. Next, the surface of the upper die is sucked, air is ejected from the surface of the molding die, and the upper die rises, so that the molded product is released from the molding die and sucked onto the surface of the upper die.

After the completion of the second step, the rotary body is rotated again by the rotary drive device, and the molding die is again immersed in the pulp liquid. With the above as one cycle, the rotary molding machine of the present invention repeats the first step and the second step.

In the rotary mold molding machine of the present invention, since the pressing molding work, which is the second step, is carried out by the molding die and the upper die in a stopped state, the draft at the time of releasing the molded product may be small, The depth can be set deeply.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of this embodiment will be described below with reference to the drawings. FIG. 1 is a schematic front view of this embodiment,
FIG. 2 shows a schematic perspective view. The rotary mold molding machine 1 of this embodiment is divided into a molding machine body 3 and an upper die supply device 5. The molding machine main body 3 mainly includes a rotating body 7, four molding dies 9a, 9b, 9c, 9d, a pressure control unit 11, and a pulp tank 13. On the other hand, the upper die supply device 5
Mainly four upper molds 15a, 15b, 15c, 15d
And the upper die moving device 41.

First, regarding the structure of the molding machine main body 3, FIG.
It will be described based on. The rotating body 7 has a hollow cylindrical shape and has four pressure chambers 8a, 8
b, 8c and 8d are formed airtight. A rotating shaft 7a is provided at the center of the rotating body 7 and rotatably supports the rotating body 7. The rotation shaft 7a is rotated and stopped by the rotation driving device 6 installed on the back surface of the rotating body 7. The rotation drive device 6 is a well-known device including a motor and a control unit, and its rotation is controlled by the control unit based on preset data such as a rotation speed and a stop position.

On the outer peripheral surface of the rotary body 7, four pedestals 21a, 21b, 21 are arranged at 90 ° intervals about the rotary shaft 7a.
c and 21d are provided. Each pedestal 21a,
21b, 21c, 21d have a mesh structure, and each pressure chamber 8a, 8b, 8c, 8d provided inside the rotating body 7
Is in communication with. Each pedestal 21a, 21b, 21c, 21
Four molding dies 9a, 9b, 9c and 9d each having a different surface shape and a mesh structure are placed and fixed on d. Therefore, each molding die 9a, 9b, 9c, 9
The surface of d and the pressure chambers 8a, 8b, 8c, 8d communicate with each other. The drafts and depths of the molding dies 9a, 9b, 9c, 9d are almost the same as the drafts θ1 and the depths d1 shown in FIG. 5 (A).

Inside the rotating body 7, a pressure control section 11 is provided independently of the rotating shaft 7a. Therefore, the pressure control unit 11 does not rotate with the rotation of the rotating body 7, and is fixed at the position shown in FIG. 1 from beginning to end. Pressure control unit 11
The discharge ports 26a and 26b are connected to a compressor 27 (see FIG. 3 or 4) and discharge compressed air, and the suction port 28 is connected to a vacuum pump 29 (see FIG. 3 or 4).
It has and. The discharge port 26a is provided at the 12 o'clock position as viewed from the rotary shaft 7a, and the discharge port 26b is also provided at the 3 o'clock position. The suction port 28 is provided at the 6 o'clock position when viewed from the rotary shaft 7a. Further, a suction area 25 is provided from 5 o'clock to 10 o'clock, and the pressure can be reduced in this area. Each discharge port 26a,
26b and the suction area 25 communicate with the pressure chambers 8a, 8b, 8c, 8d sequentially and airtightly as the rotating body 7 rotates.

The pulp tank 13 is provided at a position where the lower part of the rotating body 7 is immersed, and is filled with the pulp liquid 13a.
The pulp liquid 13a is a suspension of natural pulp or artificial pulp. An inlet 31 for the pulp liquid 13a is provided on the right side of the pulp tank 13, and the pulp liquid 1 is provided on the left side.
An overflow outlet 33 of 3a is provided. Therefore, the pulp liquid 13a constantly fills the pulp tank 13 by being replenished from the inflow port 31 and overflowing from the overflow outlet 33.

Water showers 35a and 35b are attached at positions of 3 o'clock and 9 o'clock as seen from the rotary shaft 7a for cleaning the surface of the mold. Also,
Water shower tubs 37a and 37b are respectively provided to collect the wash water. Next, the configuration of the upper die supply device 5 will be described with reference to FIGS. 1 and 2.

The upper die supply device 5 is mainly composed of four upper dies 15a, 15b, 15c and 15d and an upper die moving device 41. Four upper molds 15a, 15b, 15
c and 15d are molding dies 9a, 9b, 9c and 9d, respectively.
It is formed in a shape that matches the surface shape of. Therefore, the drafts and depths of the upper molds 15a, 15b, 15c, and 15d are the drafts θ1 and the depths d shown in FIG.
It is almost the same as 1. Upper molds 15a, 15b, 15c, 1
5d, as shown in FIG. 2, the piston rod 39a,
39b, 39c, 39d are mounted and can be moved up and down by an elevator device (not shown). In addition, the upper mold 15a,
15b, 15c and 15d are molds 9a, 9b, 9c and 9
The facing surface facing d is made of a mesh structure and communicates with the inside of the piston rods 39a, 39b, 39c, 39d. This piston rod 39a, 39b, 39
The insides of c and 39d are connected to a pressure control device (not shown) so that pressure reduction / pressurization can be adjusted.

As shown in FIG. 2, the upper die moving device 41 is
The four upper molds 15a, 15b, 15c, 15d are periodically moved / stopped on the track 41a in accordance with the rotation cycle of the rotary drive device 6. That is, at the facing position, the molds 9a, 9b, 9c, and 9d whose shapes match each other are opposed to each other, and the movement / stop is set to coincide with the rotation / stop of the rotating body 7.

Each step of the rotary molding machine 1 of the present embodiment having the above construction will be described below with reference to FIGS. 1 and 2. The rotary drive device 6 rotates the rotary shaft 7a.
When is driven, the rotating body 7 starts rotating clockwise in FIG. The rotary drive device 6 stops the drive of the rotary shaft 7a when any of the molds reaches the position of 12:00, and drives the rotary shaft 7a again after a lapse of a predetermined time, so that the next mold is driven at 12:00. Reach the position. That is, the rotary drive device 6 is
After rotating the rotating body 7 clockwise by 90 degrees, pause it,
After that, the pattern of rotating again is repeated.
In addition, the predetermined time means a time required for a pressure molding step described later.

Now, in the pulp tank 13, pulp liquid 13a
A description will be given by focusing on the molding die 9c dipped in. That is,
The molding die 9c is at the 6 o'clock position in FIG. This mold 9
Since the pressure chamber 8c is depressurized by the suction area 25, the surface of the mold 9c is depressurized. Therefore, the pulp liquid 13a adheres to the surface. This step is called a suction molding step and corresponds to the first step of the present invention. After a lapse of a predetermined time, the rotary drive device 6 rotates the rotating body 7 clockwise by 90 °.

Then, the molding die 9c reaches the 9 o'clock position in FIG. 1, and the excess amount of pulp liquid 13a adhering to the surface of the molding die 9c is washed off by the water shower 35a. The cleaning liquid is collected in the water shower tub 37a and does not flow into the pulp tank 13. The surface of the molding die 9c is still depressurized because the pressure chamber 8c is in the suction area 25,
Therefore, the pulp liquid 1 is removed from the surface of the molding die 9c more than necessary.
3a is not washed off. Therefore, the pulp liquid 13a is uniformly attached to the surface shape of the molding die 9c by this cleaning. This step is called the first cleaning step. After a lapse of a predetermined time, the rotary drive device 6 rotates the rotating body 7 clockwise by 90 °.

Then, the molding die 9c reaches the 12 o'clock position in FIG. 1 and faces the upper die 15c. Since the pressure chamber 8c of the molding die 9c communicates with the ejection port 26a, air can be ejected from the surface of the molding die 9c through the mesh structure. In this state, the upper die 15c is lowered / pressed by the forming die 9c via the piston rod 39c (see FIG. 2) by an elevator device (not shown). The pulp liquid 13a suction-molded on the surface of the molding die 9c becomes a molded product 43c (see FIG. 2) after being pressed by the upper mold 15c. Thereafter, air is instantaneously discharged from the surface of the molding die 9c, while the surface of the upper die 15c is sucked by a pressure control device (not shown). At the same time, the upper die 15c is lifted and released from the forming die 9c via the piston rod 39c by the elevating device. Therefore, the molded product 43c is released from the molding die 9c and adsorbed by the upper die 15c. The above is the press molding step, which corresponds to the second step of the present invention.

After that, the molding die 9c reaches the position of 3 o'clock in FIG. 1, and the surface of the molding die 9c from which the molded product 43c is released is washed with the water shower 35b. At this time, the pressure chamber 8c
Is discharged to the discharge port 26b, so that air is discharged from the surface of the molding die 9c. Therefore, the cleaning is effectively performed. The cleaning liquid is collected in the water shower tub 37b and does not flow into the pulp tank 13. This step is called the second cleaning step. After a lapse of a predetermined time, the rotary drive device 6 rotates the rotary body 7 clockwise by 90 °.

After the press molding process is completed, the molded product 4
As shown in FIG. 2, 3c is moved and conveyed on the track 41a by the upper die moving device 41 together with the upper die 15c. Then, above the conveyor 45, air is ejected from the surface of the upper mold 15c by a pressure adjusting device (not shown) to place the molded product 43c on the conveyor.

The above is the respective steps of this embodiment, and the rotary molding machine 1 repeats the molding work with the suction molding step, the first cleaning step, the pressure molding step and the second cleaning step as one cycle. Next, the molding line of the rotary mold molding machine 1 of this embodiment will be described with reference to FIGS. 3 and 4.

FIG. 3 exemplifies a serial molding line. That is, a plurality of rotary molding machines 1 of this embodiment
By arranging in series, the molded products 43a, 43b, 43c, 43d can be sequentially mounted on the conveyor 45 in a vertical line. On the other hand, FIG. 4 illustrates a parallel molding line. That is, by arranging a plurality of rotary molding machines 1 of the present embodiment so as to face each other with the conveyor 45 sandwiched therebetween, the molded products 43 are vertically arranged in two rows on the conveyor 45.
The a, 43b, 43c, and 43d can be sequentially placed.

Which molding line is to be used depends on, for example, the problem of installation space and molded products 43a, 43b, 43.
It is appropriately determined by considering the specifications of the sorting devices c and 43d. The effects of the rotary molding machine 1 of the present embodiment detailed above will be described below. (1) Since the rotating body 7 is stopped during the press molding process,
With a small draft, a large product with a large depth can be produced (see FIG. 5 (A)). Therefore, the degree of freedom in product design is high. (2) Since the rotating body 7 is stopped during the press molding process,
Molded products with high dimensional accuracy can be obtained. (3) Production efficiency is good because it is a rotary type. (4) By using various types of molding dies 9a, 9b, 9c, 9d, various types of molded products 43a, 43b, 43c,
43d can be produced at the same time, which is suitable for small-volume production of various products. (5) Since the rotating body 7 is stopped even in the suction molding process, suction molding can be performed for a sufficiently long time.

Needless to say, the present invention is not limited to the above-mentioned embodiments, and can be carried out in various modes without departing from the spirit of the present invention. For example, all the molding dies 9a, 9b, 9c, 9d have the same surface shape, and the upper dies 15a, 15b, 15c,
By unifying 15d with a surface shape adapted to this, the same molded product can be mass-produced.

Further, in this embodiment, the number of molding dies provided on the outer peripheral surface of the rotating body 7 is four, but this number may be singular or plural, and all of them have the same effect as this embodiment. You can

[0030]

As described above in detail, in the rotary molding machine of the present invention, the molded product is released from the mold in order to perform the pressing molding work which is the second step by the molding mold and the upper mold in the stopped state. The draft can be slight and the depth can be set deep.

Further, by using one or more molding dies, it is possible to cope with mass production of the same product and small-scale production of various products. Therefore, according to the rotary molding machine of the present invention, it is possible to increase the degree of freedom in product design.

[Brief description of drawings]

FIG. 1 is a schematic front view of the present embodiment.

FIG. 2 is a schematic perspective view of a molding line according to this embodiment.

FIG. 3 is an explanatory diagram of a series molding line according to the present embodiment.

FIG. 4 is an explanatory diagram of a parallel molding line according to the present embodiment.

FIG. 5 is an explanatory view showing an upper die and a forming die of a conventional mold forming machine, (A) is a non-rotating type and (B) is a rotating type.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotational mold forming machine, 3 ... Molding machine main body, 5 ... Upper mold supply device, 6 ... Rotation drive device, 7 ... Rotating body, 7a ...
Rotating shafts, 9a, 9b, 9c, 9d ... Molds, 11.
..Pressure control unit, 13 ... Pulp tank, 15
a, 15b, 15c, 15d ... upper mold, 25 ... suction area, 26a ... discharge port, 26b ...
・ Discharge port, 28 ... Suction port, 43a, 4
3b, 43c, 43d ... molded products,

Claims (1)

[Claims] 1. A rotary body rotatably supported by a molding die provided on an outer peripheral surface thereof, a pulp tank into which a part of the rotary body is immersed, and an upper die conforming to the surface shape of the molding die. A first step of sucking the surface of the molding die when the molding die is immersed in the pulp tank; and the molding die is the upper die. When the upper mold is lowered and pressed against the forming mold when facing each other, then the surface of the upper mold is sucked and air is discharged from the surface of the forming mold, and then the upper mold rises from the forming mold. In the rotary mold forming machine that repeats the process, the molding die is made of one or more kinds, and further provided with a rotation drive device for rotating the rotary body and stopping the rotation of the rotary body in the second step. Rotating mall characterized by Molding machine.