JPH0154174B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) This invention provides a composite structure in which a plurality of molds are installed on a rotary disk, and a part of the molds together with the rotary disk can be moved to another position. This invention relates to a rotary injection molding machine for resin molding.

(Prior Art) In a rotary injection molding machine, a split mold is installed between a rotary disk provided on the base side and a movable plate of a mold clamping device disposed at a required distance from the base.

Furthermore, in an injection molding machine having a conventional structure, an air or hydraulically operated clamp is used to fix the mold, and the clamp allows the mold to be easily attached and removed.

(Problems to be Solved by the Invention) In the above-mentioned rotary injection molding machine, when trying to fix the mold using an air- or hydraulically operated clamp, unlike when fixing a set of molds, it is difficult to fix the mold on the rotary plate. Multiple sets of molds must be fixed under the same means, and the clamps installed for each mold must be operated individually, which increases the number of piping on the rotary disk. Fixing the mold with clamps is difficult for rotary injection, as piping must be done from the center of the rotary disk to prevent it from twisting due to rotation, and it is also necessary to devise connections between each piping and the supply/discharge pipes introduced from outside the machine. Further improvements are required before it can be used in molding machines.

(Means for Solving the Problems) This invention was devised to solve the above problems in rotary injection molding machines, and its purpose is to connect supply and discharge pipes and a large number of pipes. To provide a rotary injection molding machine equipped with a new mold mounting means, which can easily perform the molding process, and can also open and close the clamps of each mold individually without causing twisting due to rotation. There is a particular thing.

The present invention for the above purpose includes a mold clamping device operated by air or hydraulic pressure arranged at the mold mounting position of the rotary disk, and a block having a fluid distribution and recovery circuit on the rotation center of the rotary disk. , a required number of valve devices are connected to each other, piping is provided between the valve devices and the mold clamp device, and a supply path is connected to a drain circuit at the center of the block.

(Function) In the above configuration, air or hydraulic pressure supplied to the block from the supply path enters the cylinder via the valve device and piping, and the cylinder operates the clamp. Further, the opening and closing operations of the clamp are performed by directional control by the valve device, and air or hydraulic pressure flowing out from the cylinder flows from the piping through the valve device and the block to the drain circuit. Also, since all the piping originates from the block at the center of the rotary disk, no twisting of the piping occurs due to rotation.

Further, the present invention will be explained in detail using illustrated examples.

(Example) 1 in the figure is a vertical rotary type in which the machine base 2 and the frame 4 of the mold clamping device 3 above the machine base are integrated, and a rotary plate 6 is provided on the machine base plate that serves as the base 5. This shows an injection molding machine, and a movable platen 8 connected to a mold clamping ram 7 is located below the mold clamping device 3. Type 9a and male type 9
b is attached.

A fluid circuit 1 is located above the rotation center of the rotary disk 6.
A fluid distribution and recovery block 11 having a 0 inside is provided with the required number of directional valve devices 12 on the sides. This block 11
consists of a distribution circuit that penetrates through the top surface and is concentric with the rotational center axis and branches into two in a direction perpendicular to the rotational center axis in the middle, and two support stems that are opened in a direction perpendicular to the rotational center axis below the distribution circuit. It has a recovery circuit that joins together and penetrates downward concentrically with the rotational center axis, and is fixed to the rotating disk in an airtight manner with a gasket.

Further, the valve device 12 is composed of a 4-port, 2-position electromagnetic valve, and is connected so that one of the branches of the distribution circuit is on the pressure side and one of the branches of the recovery circuit is on the return side.

Below the recovery circuit main body of the block 11, a drain circuit 1 is drilled through the rotary disk 6 and further to the center of the rotating shaft 13 attached to the bottom surface of the rotary disk 6.
4, an annular groove is formed along the circumference in the inner diameter part of the flange 15 on which the motor 16 is attached on the side of the base plate 5 inscribed in the horizontal hole of the rotating shaft, and a hole is formed from the annular groove through the motor mounting flange 15. A drain circuit is formed, and a drain circuit is formed from the end of the passage to the oil tank by piping or the like. In addition, the connection between the rotating disk 6 and the rotating shaft is sealed with a gasket surrounding the oil passage, and the motor mounting flange 1
The inner diameter portion of the rotary shaft 5 and the outer diameter portion of the rotating shaft 13 are also sealed with packings above and below the annular groove.

Reference numeral 17 denotes a mold clamping device, which is composed of a clamp 17a provided at each mold mounting position on the rotary disk 6 and a hydraulic cylinder 17b that operates the clamp 17a. is applied.

Reference numeral 19 denotes a steel pipe whose upper end is fixed to the frame 4 and whose lower end serves as an oil supply path connected to the main distribution circuit at the center of the block 10 using a rotary joint 20.

The flow of pressure oil in the above structure is as follows: hydraulic source → steel pipe 19 → rotary joint 20 → distribution circuit 10 in block 11 → pressure side circuit of valve device 12 → piping 18 →
The order is the clamp side oil chamber or the unclamp side oil chamber of the cylinder 17a.

Also, the flow of pressure oil on the return side is from cylinder 17a→
Collect in the following order: piping 18 → return side circuit of valve device 12 → recovery circuit in block 11 → rotary plate circulation hole → drain circuit 14 of rotating shaft 13 → motor mounting flange annular groove → motor mounting flange through hole → oil tank be done.

Although the above embodiment shows a C-frame two-stage rotary type, the number of stages may be two or more, and a four-tie bar type may be used.

Further, in the embodiment, the fluid was collected from the rotary shaft 13 through the annular groove into the tank from the side of the motor mounting flange 15, but the fluid can be collected by offsetting the motor 16 and rotating the rotary shaft 13 with a chain or the like. The fluid may be passed through the rotary shaft 13 and collected from the lower part into the tank using a rotary joint, or air may be used as the pressure source.

(Effects of the Invention) As described above, the present invention connects and provides a block having a fluid distribution and recovery circuit on the rotation center of the rotary disk and a required number of valve devices, and connects the block from the valve device to the rotary disk. Since the piping is connected to the mold clamping device above, the piping does not get twisted even though the mold moves together with the rotary disk. In addition, even if the number of piping increases, the piping is only needed between the cylinder of the mold clamping device and the valve device, so there is no need for complicated piping and assembly work can be done quickly and reliably. By fixing the mold with a clamp, mold change time is shortened and automation is possible. Furthermore, the air or hydraulic pressure required to operate the mold clamping device is supplied and discharged via the block installed at the center of rotation of the rotary disk, so the amount of piping is reduced and the surface of the rotary disk becomes tidy. It has features such as being able to provide a rotary injection molding machine with a mold clamping device that is good in appearance, durable, and easy to maintain at a low cost.

[Brief explanation of drawings]

The drawing is a schematic longitudinal sectional view of one embodiment of a rotary injection molding machine according to the present invention. 1... Vertical rotary injection molding machine, 2... Machine stand, 3
...Mold clamping device, 5...Machine table top plate, 6...Rotary plate,
8...Movable plate, 9...Mold, 10...Circuit, 11
... Block, 12 ... Valve device, 13 ... Rotating shaft, 14 ... Drain circuit, 16 ... Motor, 1
7...Mold clamp device, 19...Steel pipe.

Claims (1)

[Claims] 1 A split mold is installed across a rotary disk provided on the base side and a movable plate of a mold clamping device placed at a required distance between the base, and one of the divided molds is moved to another position using the rotary disk. In rotary injection molding machines that are transitioning to A block having a block and a required number of valve devices are connected to each other, piping is provided between the valve device and the mold clamp device, and a supply path and a drain circuit are connected to the center of the block. rotary injection molding machine.