JPH07322B2 - Vertical injection molding machine and lower mold changer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary type vertical injection molding machine having a turntable and a lower mold changer for constructing the same.

[0002]

2. Description of the Related Art A conventional rotary vertical injection molding machine with a turntable is shown in FIG. The injection device 5 on the gantry 50
2 and the mold clamping device 54 are installed. A turntable 60 is provided on a stationary platen 56 of the mold clamping device 54, which is rotatable about a vertical rotary shaft 58. A plurality of lower molds 62 can be installed on the turntable 60. When the turntable 60 rotates, the lower die 62 is sent onto the fixed platen 56 together with the turntable 60. Tie bars 64 are fixed to the four corners of the fixed board 56 perpendicularly thereto. A movable plate 68 for fixing the upper die 66 is movably fitted to the tie bar 64. The end frame 7 is at the top end of the tie bar 64.
0 is attached, and a hydraulic cylinder 72 is provided on the upper surface of the end frame 70. The piston 74 provided in the hydraulic cylinder 72 is connected to the movable plate 68, and the movable plate 68 is guided by the tie bar 64 to move up and down as the piston 74 moves up and down by the hydraulic cylinder 72. The mold 66 and the lower mold 62 are closed and opened.

[0003]

However, in the conventional vertical injection molding machine as described above, the turntable 60 is integrally incorporated in the pedestal 50 so that it cannot be easily separated. When the turntable 60 is used as a single-acting vertical injection molding machine without rotating, there is a problem that the turntable 60 becomes a hindrance and the work efficiency is reduced. It should be noted that both a single-acting vertical injection molding machine and a rotary injection molding machine may be installed in order to increase productivity, but there are problems such as securing an installation location and increasing equipment costs. The present invention aims to solve such problems.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a lower die changer having a turntable on which a plurality of dies can be attached is rotatably provided on a pedestal and can be connected to and detached from a vertical die clamping device. By solving the above, the above problem is solved. That is, the vertical injection molding machine according to the present invention includes a vertical mold clamping device, an injection device, and a lower mold changer. The vertical mold clamping device is a fixed platen, a tie bar extending vertically from this, an end frame fixed to the upper end of the tie bar, a tie bar that enables movement and a lower surface to which an upper mold can be attached. And a drive device capable of driving the movable plate in the tie bar axial direction. The lower mold changer has a turntable that allows multiple lower molds to be mounted on the top surface and that can be turned. The height of the bottom surface of the turntable is the height of the top surface of the fixed plate of the vertical mold clamping device. Is set to the same. The injection device can inject the molten resin into the cavity formed by the upper mold and the lower mold clamped by the vertical mold clamping device. The lower mold changer can switch between a state in which the upper mold and the lower mold are set so that the positions of the upper mold and the lower mold are aligned with respect to the vertical mold clamping device, and a state in which the vertical mold clamping device is separated from the vertical mold clamping device.

In the vertical injection molding machine according to the present invention, a lower mold changer in which a turntable capable of mounting a plurality of molds is rotatably mounted on a turntable mount is provided to provide a vertical mold clamping device. By connecting them together, a rotary vertical injection molding machine can be easily obtained. Further, depending on the application, the lower mold changer can be detached to be used as a single-acting vertical injection molding machine.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a vertical injection molding machine comprises an injection device 10, a vertical mold clamping device 12 and a lower mold changer 14. Injection device 10 and vertical mold clamping device 1
2 is arranged on a common mount 16 as shown in FIG. First, the structure of the vertical mold clamping device 12 will be described. A fixed platen 18 is fixed on the frame 16, and tie bars 20 are provided at four corners of the fixed platen 18 (see FIG. 4) perpendicularly to the fixed platen 18. A movable plate 22 is fitted on the tie bar 20 and is provided so as to be movable in the axial direction thereof. An end frame 24 is attached to the upper end of the tie bar 20. A hydraulic cylinder 26 is mounted on the end frame 24. The hydraulic cylinder 26 is provided with a piston 28, and the lower end of the piston 28 is connected to the upper surface of the movable platen 22. An upper die 30 is attached to the lower surface of the movable platen 22. With such a structure, the movable platen 22 is provided with the piston 28 by the hydraulic cylinder 26.
The tie bar 20 guides and moves up and down in accordance with the vertical movement of the tie bar. As a result, it is possible to change the vertical position of the upper mold 30 and perform mold opening / closing with the lower mold 38 described later. The injection device 10 is a general one and can inject a resin raw material into a mold by melting it.

Next, the lower mold changer 14 shown in FIG. 3 will be described. Rotating shaft 34 on turntable mount 32
And a horizontal turntable 36 is attached to the upper end of the rotary shaft 34. The turntable 36 is rotated by a rotary drive device (not shown).
Rotate intermittently around 4. Turntable stand 3
The height from the lower surface of 2 to the lower surface of the turntable 36 is equal to the height from the lower surface of the gantry 16 to the upper surface of the fixed platen 18. The turntable 36 has a plurality of lower molds 3
8 (see FIG. 1) can be attached.

Next, a method of connecting the vertical mold clamping device 12 and the lower mold changer 14 will be described. The lower mold changer 14 is positioned so that the lower mold changer 14 is adjacent to the vertical mold clamping device 12. At this time, the turntable mount 32 is mounted so that the lower mold 38 on the turntable 36 is located directly below the upper mold 30 of the fixed platen 18.
Align with. Next, as shown in FIG. 4, the pedestal 16 and the turntable pedestal 32 are connected and fixed by the connecting rods 40 at the two ends thereof. At this time, the position of the lower die 38 on the turntable 36 is the upper die 3
Matches position 0.

Next, the process of injection molding will be described for the case where two lower molds 38 are attached at opposite positions on the turntable 36 (see FIGS. 1 and 4). The turntable 36 is rotated by a rotation drive device (not shown), and the lower die 38 mounted on the turntable 36 is fed onto the stationary platen 18. The movable platen 2 is driven by driving the piston 28 by the hydraulic cylinder 26.
2 is lowered to bring the upper mold 30 attached to the lower surface of the movable plate 22 into contact with the lower mold 38. The mold is clamped, the molten resin is injected into the mold by the injection device 10, and the cooling,
Let it solidify. While performing this operation, the lower die 38 on the opposite side performs an operation of taking out a molded article molded in the previous cycle and an operation of inserting for the next cycle. When both operations are completed, the movable platen 22 is raised to open the mold, and the turntable 36 is rotated to rotate the lower mold 38 on the left and right.
To replace. Thereafter, the molding operation can be continued by repeating the same operation.

When used as a single-acting type, as shown in FIG.
As shown in FIG. 5, the lower die changer 14 may be removed and the molding operation may be performed.

Although the above description is an example of performing the molding operation using a plurality of lower molds 38 for one upper mold 30, the lower mold changer 14 may be used for mold replacement. it can. That is, a plurality of sets of different molds are set on the turntable 36 in an upper and lower set, and after a predetermined number of moldings are completed using one set of molds, the turntable 36
By rotating the mold and performing injection molding using a different set of molds, it is possible to rationalize the mold replacement work.

The vertical injection molding machine 12 according to the present invention is not limited to the shape shown in the above embodiment. For example, a C-frame mold clamping device as shown in FIG. 5 may be used as the vertical mold clamping device 12. Also, the lower mold changer 14
Also, as shown in FIG. 6, casters (wheels for running on the floor) 42 may be provided on the lower surface of the turntable frame 32,
This can facilitate the transportation of the lower mold changer 14. Further, the vertical injection molding machine 12 and the lower mold changer 14 do not necessarily have to be connected by the connecting rod 40, and if they are aligned, they may be fixed on the floor in an independent state. Further, the lower mold changer 14 may be provided with a mechanism for adjusting the height of the turntable 36, so that the lower mold changer 14 can be applied to a mold clamping device in which the height of the fixed platen is different.

[0013]

As described above, according to the present invention, the vertical mold clamping device and the lower mold changer are provided so as to be connectable / detachable, which facilitates the production, the molding work and the automation device. As a result, the injection molding machine can be easily switched to the single-acting type or the rotary type, so that the flexibility of the equipment can be obtained and the equipment cost can be reduced. In addition, from the standpoint of manufacturing injection molding machines, it is not necessary to separately produce rotary and single-acting vertical injection molding machines, so it is possible to shorten delivery times, reduce inventory, and reduce costs. Become.

[Brief description of drawings]

FIG. 1 is an overall view showing a vertical injection molding machine of the present invention.

FIG. 2 is a diagram when a single-acting vertical injection molding machine is used.

FIG. 3 is a view showing a lower mold changer.

FIG. 4 is a plan view looking in the direction of arrows 4-4 in FIG.

FIG. 5 is a view showing a C frame type mold clamping device which is another embodiment.

FIG. 6 is a view in which casters are attached to the lower mold changer.

FIG. 7 is a view showing a conventional rotary vertical injection molding machine.

[Explanation of symbols]

 10 injection device 12 vertical mold clamping device 14 lower mold changer 16 frame 18 fixed plate 20 tie bar 22 movable plate 24 end frame 26 hydraulic cylinder (driving device) 28 piston 30 upper mold 32 turntable frame 34 rotary shaft 36 turn Table 38 Lower mold 40 Connecting rod

Claims (4)

[Claims] 1. A vertical mold clamping device (12), an injection device (10), and a lower mold changer (14). The vertical mold clamping device (12) comprises a stationary platen (18). And a tie bar (20) extending vertically from this and an end frame (24) fixed to the upper end of the tie bar (20).
And a movable plate (22) that can be moved by being guided by the tie bar (20) and can be attached with an upper mold (30) on the lower surface.
And a drive device (26) capable of driving the movable plate (22) in the axial direction of the tie bar, and the lower mold changer (1
4) has a turntable (36) on the upper surface of which a plurality of lower molds (38) can be attached and which is rotatable, and the height of the lower surface of the turntable (36) is a vertical mold clamping device. The height of the upper surface of the fixed platen (18) of (12) is set to be the same, and the injection device (10) is an upper mold (30) and a lower mold clamped by a vertical mold clamping device (12). Molten resin can be injected into the cavity formed by the mold (38), and the lower mold changer (14) is used for the vertical mold clamping device (12) and the upper mold (30) and the lower mold (14). 38) A vertical injection molding machine capable of switching between a state in which the positions of the vertical mold clamping device and the vertical mold clamping device are set to coincide with each other and a state in which the vertical mold clamping device (12) is separated. 2. The lower mold changer (14) is a turntable stand (3) provided with wheels (42) for floor running.
The vertical injection molding machine according to claim 1, further comprising 2). 3. A lower mold changer (14) used in combination with a vertical mold clamping device (12), comprising a turntable stand (32), which is rotatably supported by this and is mounted on the upper surface thereof. A turntable (36) to which a plurality of lower molds (38) can be attached, and the height of the lower surface of the turntable (36) is the fixed plate of the vertical mold clamping device (12) ( The height of the upper surface of 18) is the same as that of the upper surface of the turntable table 32. The turntable base 32 is aligned with the vertical mold clamping device 12 so that the lower mold 38 can be clamped. Lower mold changer that can be set to the specified state. 4. The lower mold changer according to claim 3, wherein the turntable frame (32) is provided with wheels (42) for traveling on the floor.